This invention relates generally to a display device and more particularly relates to a display device provided with a heat sink.
Conventional display devices comprise a heat sink (for example, see Patent Literature 1).
This Patent Literature 1 disclose that a display device comprising a display unit, a light source unit, and a light guide plate that includes an incident end surface and guides the light from the incident end surface to the display unit. Moreover, the display device comprises a spacer portion that separates the light source unit and the light guide plate by a predetermined distance at a predetermined interval, a connection unit that fixedly holds the light source unit, a heat sink to which the connection unit is fixedly installed, a biasing member that biases the heat sink to a light-guide-plate side, and a rear frame that supports the heat sink so that the heat sink is movable in a direction orthogonal to the incident end surface.
The heat sink is disposed on an outer side of the rear frame. The light source unit and the light guide plate are separated by the distance at the constant interval by the light source unit being biased by the biasing member to the light-guide-plate side. Therefore, according to the display device, even in a situation where the light guide plate expands or contracts due to heat, the connection unit and the heat sink of the display device move together with the light source unit and the light source unit and the light guide plate are separated by the distance at the constant interval. By separating the light source unit and the light guide plate by the distance at the constant interval by the spacer portion, an incidence amount of the light to the light guide plate is stabilized; therefore, a usage efficiency of the light improves.
[Patent Literature 1] JPA 2011-253769
However, in the display device of Patent Literature 1, because the light source unit is held by the connection unit and the connection unit is installed to the heat sink, there is a problem where the heat sink does not dissipate heat by directly receiving heat from the light source unit and must dissipate heat via the connection unit and heat dissipation is unfavorable. Moreover, because the heat sink is disposed on the outer side of the rear frame and connected to the light source unit, which is on an inner side of the rear frame, via the connection unit, there is a problem where a device configuration for moving the heat sink together with the light source unit is complex.
A display device in accordance with one or more embodiments can more effectively dissipate heat from a light source unit by a heat sink and can simplify a configuration whereby the light source unit and the heat sink are moved according to expansion and contraction of a light guide plate due to heat.
In one aspect, a display device according to one or more embodiments of the present invention may comprise a display unit, a light source unit, a light guide plate that includes an incident end surface and guides the light incident from the incident end surface to the display unit, a spacer portion that separates the incident end surface and the light source unit by the predetermined distance at the predetermined interval, a heat sink that is disposed on an opposite side of the light guide plate on the light source unit, fixedly holds the light source unit, and is separate from and not connected to the light guide plate, a biasing member that biases the light source unit and the heat sink to a light-guide-plate side, and a rear frame that is disposed on an outer side of the heat sink and supports the heat sink so that the heat sink is movable in a first direction orthogonal to the incident end surface.
According to one or more embodiments of the present invention, as above, by comprising the heat sink that fixedly holds the light source unit, the light source unit may be held by the heat sink; therefore, heat from the light source unit may be immediately dissipated from the heat sink. Therefore, the display device may efficiently dissipate the heat from the light source unit by the heat sink. Moreover, by comprising the spacer portion that separates the incident end surface and the light source unit by the predetermined distance at the predetermined interval and providing the rear frame that supports the heat sink so that the heat sink is movable in the first direction orthogonal to the incident end surface on the outer side of the heat sink, the heat sink, similarly to the light source unit, becomes movable in a state of being disposed on an inner side of the rear frame, and the heat sink moves while the distance between the light source unit and the light guide plate are separated by the predetermined distance at the constant interval by the spacer portion; therefore, a configuration of moving the light source unit and the heat sink may be simplified.
According to one or more embodiments above, for example, the light source unit and the heat sink may move while being separated at the predetermined interval relative to the light guide plate via the spacer portion in conjunction with movement in the first direction of the incident end surface by expansion or contraction of the light guide plate. By such a configuration, even in a situation where the light guide plate expands or contracts, the predetermined interval between the light source unit and the light guide plate may be maintained; therefore, an incidence amount of the light to the light guide plate may be stabilized.
According to one or more embodiments above, for example, the rear frame may include a side surface portion positioned on an outer side of the heat sink in the first direction, and the biasing member may be disposed between the side surface portion of the rear frame and the heat sink to continuously bias the beat sink to the light-guide-plate side. By such a configuration, even in the situation where the light guide plate expands or contracts, a pressing force to the light-guide-plate side is continuously applied to the light source unit and the heat sink by the biasing member; therefore, the light source unit and the light guide plate may be reliably separated by the predetermined distance at the predetermined interval via the spacer portion.
The display device according to one or more embodiments above, for example, further may comprise a reflective sheet that is disposed on a rear side of the light guide plate on an opposite side of a front side on which the display unit is disposed in the light guide plate, and a support portion that supports the light guide plate and the reflective sheet from the rear side, wherein the support portion, even in a situation where it moves together with the heat sink and the support portion moves, has a predetermined gap for preventing an end portion on a light source unit side of the reflective sheet from abutting the support portion. As a result, by the expansion or contraction of the light guide plate, the reflective sheet disposed on the rear side of the heat sink abuts the support portion and prevent a force from being applied in a surface direction of the reflective sheet; therefore, deflection may be suppressed from arising in the reflective sheet.
In this situation, for example, the support portion may include a light guide plate support surface that supports the light guide plate and a reflective sheet support surface that supports the reflective sheet, wherein a difference in height in a front and rear direction between the light guide plate support surface and the reflective sheet support surface is greater than a thickness in a front and rear direction of the reflective sheet. By such a configuration, by the gap being formed between the reflective sheet, which is disposed between the light guide plate support surface and the reflective sheet support surface, and the light guide plate, a contact surface pressure between the reflective sheet and the light guide plate is reduced; therefore, the reflective sheet becomes less likely to move in conjunction with the movement of the light guide plate. Thus, due to the reflective sheet abutting the support portion by the movement of the reflective sheet, deflection may be suppressed from arising in the reflective sheet.
According to one or more embodiments above, for example, the light source unit may include a light source unit that emits a light and a mounting substrate on which the light source unit is mounted, wherein the spacer portion respectively contacts a mounting surface of the mounting substrate on which the light source unit is mounted and the incident end surface of the light guide plate, so that a thickness of the spacer portion corresponding to the gap in the first direction between the mounting surface and the incident end surface is greater than a thickness of the light source unit in the first direction, and so that the incident end surface and the light source unit are separated by the predetermined distance in a state of being near each other at the predetermined interval. As a result, because the light source unit and the light guide plate (incident end surface) may be separated by the distance in the state of being near each other at the predetermined interval, the incidence amount of the light to the light guide plate is stabilized, and a usage efficiency of the light may be improved.
According to one or more embodiments above, for example, the incident end surface of the light guide plate may be an end surface on a longitudinal-direction side of the light guide plate that is the first direction, and the light guide plate may be supported by the rear frame in a state of being positioned on the rear frame in a substantially central position in a longitudinal direction. As a result, an expansion amount of the light guide plate, whose thermal expansion is large, in the longitudinal direction may be sorted evenly to both end-portion sides in the longitudinal direction of the light guide plate; therefore, a margin region provided for the expansion on both end-portion sides of the light guide plate may be made small. Thus, a size of a frame of the display device in a longitudinal direction may be made small.
In this situation, for example, the light guide plate may include a first engagement portion formed on an end portion on a lateral-direction side in the substantially central position in the longitudinal direction, and the rear frame may be provided, in a position corresponding to the first engagement portion, with a second engagement portion that engages with the first engagement portion, so that the light guide plate is positioned in the longitudinal direction by engaging the second engagement portion with the first engagement portion. As a result, the light guide plate may be reliably positioned on to the rear frame in the substantially central position in the longitudinal direction.
According to one or more embodiments above, for example, the rear frame may include a guide portion that is provided on an inner-top-surface side of the rear frame and guides the movement of the heat sink, and the heat sink that slides in the first direction along the guide portion. As a result, by the guide portion of the rear frame, the sliding of the heat sink in conjunction with the movement of the light guide plate may be stabilized.
According to one or more embodiments above, for example, two incident end surfaces of the light guide plate may be provided on both end surface of the light guide plate in the first direction, and the light source unit, the spacer portion, the heat sink, and the biasing member are respectively provided on both incidence-end-surface sides of the light guide plate. As a result, a guiding distance of a light in a surface direction of the light guide plate may be shortened; therefore, a brightness of an image displayed on the display unit may be stabilized.
According to one or more embodiments above, for example, the biasing member may be formed integrally with the rear frame. As a result, the biasing member and the rear frame are integrally formed; therefore, a device configuration may be simplified.
The display device according to one or more embodiments of the present invention may comprise a display unit, a light source unit, a light guide plate that includes an incident end surface and guides the light incident from the incident end surface to the display unit, a heat sink that fixedly holds the light source unit, and a fixing member for integrally fixing an incidence-end-surface side of the light guide plate and the heat sink in a state where a distance between the incident end surface and the light source unit is maintained at a predetermined interval.
According to one or more embodiments of the present invention, as above, by comprising the fixing member for integrally fixing the incidence-end-surface side of the light guide plate and the heat sink in the state where the distance between the incident end surface and the light source unit is maintained at the predetermined interval, the incidence-end-surface side of the light guide plate and the heat sink are integrally fixed by the fixing member; therefore, even in the situation where the light guide plate expands or contracts due to heat, the incident end surface and the light source unit may be separated by the predetermined distance at the predetermined interval. Thus, the incidence amount of the light to the light guide plate may be stabilized; therefore, the display device may improve the usage efficiency of the light.
The display device according to one or more embodiments above, for example, may comprise a rear frame that supports the heat sink so that the heat sink is movable in a direction orthogonal to the incident end surface of the light guide plate, wherein the heat sink that moves relative to the rear frame while being separated at the predetermined interval in conjunction with the movement of the incident end surface in the first direction due to the expansion or contraction of the light guide plate. As a result, in the situation where the light guide plate expands or contracts due to heat, the heat sink on the incidence-end-surface side of the light guide plate may be stably moved relative to the rear frame.
According to one or more embodiments above, for example, by the fixing member being installed to the heat sink so that the incidence-end-surface side of the light guide plate is positioned between the fixing member and the heat sink, the incidence-end-surface side of the light guide plate and the heat sink may be integrally fixed to each other. As a result, so that the light guide plate is positioned by the fixing member and the heat sink, the heat sink and the light guide plate are fixed; therefore, the heat sink and the light guide plate may be stably and integrally fixed.
The display device according to one or more embodiments above, for example, may comprises a spacer portion that is disposed between the incident end surface and the light source unit and separates the incident end surface and the light source unit by the predetermined distance at the predetermined interval and a biasing member that biases toward an incidence-end-surface-spacer portion side of the light guide plate. As a result, so that the heat sink that fixedly holds the light source unit and the incidence-end-surface side of the light guide plate are integrally fixed by the fixing member, the incident end surface of the light guide plate is biased toward a spacer portion side by the biasing member; therefore, a function of the spacer portion that separates the incident end surface of the light guide plate and the light source unit by the predetermined distance at the predetermined interval may be reliably exhibited.
According to one or more embodiments above, for example, the fixing member may include a plate-shaped fixing member that abuts a surface of the light guide plate on an opposite side of a surface of the light guide plate abutting the heat sink and extends in a direction along the incident end surface of the light guide plate, and the plate-shaped fixing member is to integrally fix the incidence-end-surface side of the light guide plate and the heat sink by applying a pressing force on a heat-sink side of the light guide plate. As a result, the plate-shaped fixing member may be made to reliably make surface contact with the light guide plate; therefore, the fixed state between the incidence-end-surface side of the light guide plate and the heat sink may be further stabilized.
According to one or more embodiments above, for example, the fixing member may include a fourth engagement portion that engages with the light guide plate and a fifth engagement portion that engages with the heat sink, the heat sink may comprise an opening portion into which the fixing member is inserted and installed, and the fixing member may integrally fix the incident end surface of the light guide plate and the heat sink by engaging the fourth engagement portion with the heat sink and engaging the fifth engagement portion with the light guide plate by being inserted into the opening portion. As a result, by merely inserting the fixing member into the opening portion of the heat sink, the fourth engagement portion and the fifth engagement portion respectively engage with the heat sink and the light guide plate; therefore, the heat sink and the light guide plate may be easily engaged. Moreover, the heat sink and the light guide plate may be engaged by the fixing member itself; therefore, a member for installing the fixing member (for example, a screw) may be eliminated.
In this situation, for example, the display device may comprise a spacer portion that is disposed between the incident end surface of the light guide plate and the light source unit and separates the incident end surface and the light source unit by the predetermined distance at the predetermined interval, wherein the fixing member also functions as the spacer portion. By such a configuration, the fixing member may be made to also function as the spacer portion; therefore, compared to a configuration where the fixing member and the spacer portion are provided separately, a component count may be reduced.
In one or more embodiments where the fixing member comprises the fourth engagement portion and the fifth engagement portion, for example, an end portion of the heat sink may be formed in a U shape to cover the incident end surface of the light guide plate and an upper surface near the incidence surface. As a result, the incident end surface of the light guide plate and the upper surface near the incident end surface are covered by the U-shaped end portion of the heat sink; therefore, the end portion of the heat sink may be made to also function as a reflector that reflects the light from the light source unit toward the light guide plate. Thus, the usage efficiency of the light may be further improved.
According to one or more embodiments of the present invention, as above, the display device may more effectively dissipate heat from the light source unit by the heat sink and may simplify the configuration whereby the light source unit and the heat sink are moved according to the expansion and contraction of the light guide plate due to heat.
Embodiments of the present invention will be described below based on the drawings.
A television device 100 according to one or more embodiments of a first example of the present invention will be described with reference to
As illustrated in
As illustrated in
The bezel 12 is installed to the mold frame 13 in a state of interposing the liquid crystal cell 11 from the front (Y1 direction) of the mold frame 13. The mold frame 13 is a frame-shaped member made of resin and, in addition to the liquid crystal cell 11, holds the optical sheet 14 on a back-surface side. Moreover, the mold frame 13 is disposed on an inner side of the front cabinet 2. The optical sheet 14 is a diffusion plate or another functional sheet and is provided in a plurality. The light source unit 5 is respectively provided near both end portions of the light guide plate 4 in the horizontal direction (X direction). The light guide plate 4 is disposed on a rear side (Y2-direction side) of the optical sheet 14. Moreover, the light guide plate 4 respectively comprises an incident end surface 4a on both end portions in the horizontal direction (X direction). Moreover, the light guide plate 4 guides the light emitted from the light source unit 5 and incident from the incident end surface 4a of the light guide plate 4 to the liquid crystal cell 11.
The incident end surface 4a of the light guide plate 4 is respectively provided on both end surfaces of the light guide plate 4 in the horizontal direction (X direction). Moreover, the television device 100 is respectively provided with the light source unit 5, the heat sink 6, the support spacer member 7, and the first biasing member 8 on both of the two incident end surfaces 4a. The reflective sheet 41 is disposed on a rear side (Y2-direction side) of the light guide plate 4 and reflects the light from the light source unit 5 to a light-guide-plate 4 side (liquid-crystal-cell 11 side). Moreover, the heat sink 6 is respectively provided near both end portions of the light guide plate 4 in the horizontal direction (X direction). The support spacer member 7 is disposed on a front-surface side of the heat sink 6 and supports the light guide plate 4 and the reflective sheet 41.
This television device 100 is a liquid television device of a so-called edge-light type (side-light type) where the light source 5 is disposed on an end-portion side of the light guide plate 4. The light source units 5, the heat sinks 6, the support spacer members 7, and the first biasing members 8 on the X1-direction side and the X2-direction side have configurations similar to each other. Therefore, hereinbelow, for the light source unit 5, the heat sink 6, the support spacer member 7, and the first biasing member 8, the configuration on the X2-direction side will be described, and description of the configuration on the X1-direction side will be omitted.
As illustrated in
The LED 51 is disposed to line up in a plurality in the vertical direction (Z direction) on the mounting surface 52a on an X1-direction side of the mounting substrate 52. Moreover, the LED 51 and the light guide plate 4 (incident end surface 4a) are separated by a predetermined distance at a predetermined interval (D1 to D2) (see
Furthermore, as illustrated in
The mounting substrate installation portion 62 fixedly holds the mounting substrate 52 (light source unit 5) via a heat dissipating tape 53 (see
The tabular portion 61 comprises a hole portion 63 that is engaged to the rear frame 3. Three hole portions 63 are formed, and each is disposed to line up separated by predetermined intervals from each other in the vertical direction (Z direction). Moreover, as illustrated in
As illustrated in
As illustrated in
The support portion 71 (support spacer member 7) moves together with the heat sink 6. That is, the support spacer member 7 moves together with the heat sink 6 because the first spacer portion 72 integral with the support portion 71 is continuously interposed between the light guide plate 4 (incident end surface 4a) and the mounting substrate 52 (mounting surface 52a) of the light source unit 5. Moreover, the support portion 71, in a situation where it moves together with the heat sink 6, has a predetermined gap S (see
Furthermore, as illustrated in
As illustrated in
As illustrated in
For example, the rear frame 3 projects to the front (Y1 direction) in a position corresponding to the hole portion 63 of the heat sink 6 and is formed with the hook guide portion 31 of a T-shape (see
Furthermore, as illustrated in
Furthermore, as illustrated in
As illustrated in
According to one or more embodiments of the first example, effects such as below can be obtained.
According to one or more embodiments of the first example, as above, by providing the heat sink 6 that fixedly holds the light source unit 5, the light source unit 5 is held by the heat sink 6; therefore, the heat from the light source unit 5 may be immediately dissipated from the heat sink 6. Therefore, the television device 100 may efficiently dissipate the heat from the light source unit 5 by the heat sink 6. Moreover, by providing the first spacer portion 72 that separates the incident end surface 4a and the light source unit 5 by the predetermined distance at the predetermined interval and providing the rear frame 3 that supports the heat sink 6 so the heat sink 6 can move in the horizontal direction (X direction) orthogonal to the incident end surface 4a on the outer side of the heat sink 6, the heat sink 6, similarly to the light source unit 5, becomes movable in the state of being disposed on the inner side of the rear frame 3, and the heat sink 6 moves while the distance between the light source unit 5 and the light guide plate 4 is held constant by the first spacer portion 72; therefore, a configuration of moving the light source unit 5 and the heat sink 6 may be simplified.
Furthermore, according to one or more embodiments of the first example, as above, the light source unit 5 and the heat sink 6 move while being separated at the predetermined interval relative to the light guide plate 4 via the first spacer portion 72 in conjunction with movement of the incident end surface 4a in the horizontal direction (X direction) by the expansion or contraction of the light guide plate 4. Thus, even in a situation where the light guide plate 4 expands or contracts, the light source unit 5 and the light guide plate 4 may be separated at the predetermined interval; therefore, an incidence amount of the light to the light guide plate 4 may be stabilized.
Furthermore, according to one or more embodiments of the first example, as above, the first biasing member 8 is disposed between the side surface portion 33 of the rear frame 3 and the heat sink 6 to continuously bias the heat sink 6 to the light-guide-plate 4 side. Thus, even in the situation where the light guide plate 4 expands or contracts, the pressing force to the light-guide-plate 4 side is continuously applied to the light source unit 5 and the heat sink 6 by the first biasing member 8; therefore, the light source unit 5 and the light guide plate 4 may be reliably separated by the predetermined distance at the predetermined interval via the first spacer portion 72.
Furthermore, according to one or more embodiments of the first example, as above, the predetermined gap S is provided for preventing the end portion on the light-source-unit 5 side of the reflective sheet 41 from abutting the support portion 71 even in a situation where the support portion 71 (spacer support member 7) is moved together with the heat sink 6 and the support portion 71 moves. Thus, by the expansion or contraction of the light guide plate 4, the reflective sheet 41 disposed on the rear side of the heat sink 6 can abut the support portion 71 and prevent a force from being applied in a surface direction of the reflective sheet 41; therefore, deflection may be suppressed from arising in the reflective sheet 41.
Furthermore, according to one or more embodiments of the first example, as above, the difference T1 in height in the front and rear direction between a light guide plate support surface 71a and a reflective sheet support surface 71b is made to be greater than the thickness T2 of the reflective sheet 41 in the front and rear direction. Thus, by the gap (T1 to T2) being formed between the reflective sheet 41, which is disposed between the light guide plate support surface 71a and the reflective sheet support surface 71b, and the light guide plate 4, a contact surface pressure between the reflective sheet 41 and the light guide plate 4 is reduced; therefore, the reflective sheet 41 becomes less likely to move in conjunction with the movement of the light guide plate 4. Thus, due to the reflective sheet 41 abutting the support portion 71 of the spacer support member 7 by the movement of the reflective sheet 41, deflection can be suppressed from arising in the reflective sheet 41.
Furthermore, according to one or more embodiments of the first example, as above, the first spacer portion 72 respectively contacts the mounting surface 52a of the mounting substrate 52 on which the light source is mounted and the incident end surface 4a of the light guide plate 4, so that the thickness D1 of the first spacer portion 72 corresponding to the gap in the horizontal direction (X direction) between the mounting surface 52a and the incident end surface 4a is greater than the thickness D2 of the light source in the horizontal direction, and so the incident end surface 4a and the light source 51 are separated in a state of being near each other at the predetermined interval. Thus, because the light source and the light guide plate 4 (incident end surface 4a) can be separated in the state of being near each other at the predetermined interval (D1 to D2), the incidence amount of the light to the light guide plate 4 may be stabilized, and a usage efficiency of the light may be improved.
Furthermore, according to one or more embodiments of the first example, as above, the incident end surface 4a of the light guide plate 4 is made to be the end surface on a horizontal-direction side of the light guide plate 4 that is in the horizontal direction (X direction), and the light guide plate 4 is supported by the rear frame 3 in the state of being positioned on the rear frame 3 in the substantially central position in the horizontal direction. Thus, an expansion amount of the light guide plate 4, whose thermal expansion is large, in the horizontal direction can be sorted evenly to both end-portion sides in the horizontal direction of the light guide plate 4; therefore, a margin region provided for the expansion of the light guide plate 4 on both end-portion sides may be made small. Thus, a size of a frame of the television device 100 in the horizontal direction may be made small.
Furthermore, according to one or more embodiments of the first example, as above, so that the light guide plate 4 is positioned in the horizontal direction by the notched engagement portion 4b formed on the end portion on the vertical-direction side (Z-direction side) in the substantially central position in the horizontal direction (X direction) being provided on the light guide plate 4, the convex engagement portion 32 provided in the position corresponding to the notched engagement portion 4b engages with the notched engagement portion 4b being provided on the rear frame 3, and the convex engagement portion 32 engaging with the notched engagement portion 4b. Thus, the light guide plate 4 may be reliably positioned on the rear frame 3 in a substantially central position in the longitudinal direction (X direction).
Furthermore, according to one or more embodiments of the first example, as above, the hook guide portion 31 that is provided on the inner-top-surface side of the rear frame 3 and guides the movement of the heat sink 6 is provided on the rear frame 3, and the heat sink 6 slides in the horizontal direction (X direction) along the hook guide portion 31. Thus, by the hook guide portion 31 of the rear frame 3, the sliding of the heat sink in conjunction with the movement of the light guide plate 4 may be stabilized.
Furthermore, according to one or more embodiments of the first example, as above, two incident end surfaces 4a of the light guide plate 4 are provided on both end surface of the light guide plate 4 in the horizontal direction (X direction), and the light source unit 5, the support spacer member 7, the heat sink 6, and the first biasing member 8 are respectively provided on both of the two incidence-end-surface 4a sides of the light guide plate 4. Thus, a guiding distance of the light in the surface direction of the light guide plate 4 may be shortened; therefore, a brightness of an image displayed on the liquid crystal cell 11 may be stabilized.
Next, a second example will be described with reference to
As illustrated in
Other configurations of the second example are similar to those of the first example.
According to one or more embodiments of the second example, effects such as below can be obtained.
According to one or more embodiments of the second example, similarly to the first example, by providing the heat sink 6 that fixedly holds the light source unit 5, the television device 200 can efficiently dissipate the heat from the light source unit 5 by the heat sink 6. Moreover, by providing the first spacer portion 72 that separates the incident end surface 4a and the light source unit 5 by the predetermined distance at the predetermined interval and providing the rear frame 3 that supports the heat sink 6 so that the heat sink is movable in the horizontal direction (X direction) orthogonal to the incident end surface 4a on the outer side of the heat sink 6, the configuration that moves the light source unit 5 and the heat sink 6 for holding the distance of the light source unit 5 and the light guide plate 204 constant can be simplified.
Other effects of one or more embodiments of the second example are similar to those of one or more embodiments of the first example.
Next, a third example will be described with reference to
As illustrated in
Other configurations of the third example are similar to those of the first example.
According to one or more embodiments of the third example, effects such as below can be obtained.
According to one or more embodiments of the third example, similarly to the first example, by providing the heat sink 6 that fixedly holds the light source unit 5, the television device 300 can efficiently dissipate the heat from the light source unit 5 by the heat sink 6. Moreover, by providing the first spacer portion 72 that separates the incident end surface 4a and the light source unit 5 by the predetermined distance at the predetermined interval and providing the rear frame 303 that supports the heat sink 6 so that the beat sink 6 can move in the horizontal direction (X direction) orthogonal to the incident end surface 4a on the outer side of the heat sink 6, the configuration that moves the light source unit 5 and the heat sink 6 for holding the distance of the light source unit 5 and the light guide plate 4 constant can be simplified.
Furthermore, according to one or more embodiments of the third example, as above, the first biasing member 308 is integrally formed with the rear frame 303. Thus, the first biasing member 308 and the rear frame 303 are integrally formed; therefore, a device configuration may be simplified.
Other effects of one or more embodiments of the third example are similar to those of one or more embodiments of the first example.
A television device 400 according to one or more embodiments of a fourth example of the present invention will be described with reference to
As illustrated in
The bezel 12 is installed to the mold frame 13 in the state of interposing the liquid crystal cell 11 from the front (Y1 direction) of the mold frame 13. The mold frame 13 is a frame-shaped member made of resin and, in addition to the liquid crystal cell 11, holds the optical sheet 14 on the back-surface side. Moreover, the mold frame 13 is disposed on the inner side of the front cabinet 2. The optical sheet 14 is a diffusion plate or another functional sheet and is provided in a plurality. The light source unit 5 is respectively provided near both end portions of the light guide plate 4 in the horizontal direction (X direction). The light guide plate 4 is disposed on the rear side (Y2-direction side) of the optical sheet 14. Moreover, the light guide plate 4 respectively includes the incident end surface 4a on both end portions in the horizontal direction (X direction). Moreover, the light guide plate 4 guides the light emitted from the light source unit 5 and incident from the incident end surface 4a of the light guide plate 4 to the liquid crystal cell 11.
The incident end surface 4a of the light guide plate 4 is respectively provided on both end surfaces of the light guide plate 4 in the horizontal direction (X direction). Moreover, in the television device 400, the light source unit 5, the heat sink 6, and the plate-shaped fixing member 9 are respectively provided on both incidence-end-surface 4a sides. The reflective sheet 41 is disposed on the rear side (Y2-direction side) of the light guide plate 4 and reflects the light from the light source unit 5 to the light-guide-plate 4 side (liquid-crystal-cell 11 side). Moreover, the heat sink 6 is respectively provided near the light guide plate 4. Moreover, the heat sink 6 supports the light guide plate 4 and the reflective sheet 41 on the front-surface side (surface side in the Y1 direction) by a support portion 64 (see
According to one or more embodiments of the fourth example, the plate-shaped fixing member 9 integrally fixes the incidence-end-surface 4a side of the light guide plate 4 and the heat sink 6 in the state where the distance between the incident end surface 4a of the light guide plate 4 and the light source unit 5 is maintained at the predetermined interval (D1 to D2) (see
This television device 400 is a liquid television device of the so-called edge-light type (side-light type) where the light source 5 is disposed on the end-portion side of the light guide plate 4. The light source units 5, the heat sinks 6, and the plate-shaped fixing members 9 on the X1-direction side and the X2-direction side have configurations similar to each other. Therefore, hereinbelow, for the light source unit 5, the heat sink 6, and the plate-shaped fixing member 9, the configuration on the X2-direction side will be described, and description of the configuration on the X1-direction side will be omitted. Moreover, hereinbelow, the side where the light source unit 5 on the X2-direction side of the light guide plate 4 is disposed is made to be the outer side (X2-direction side), and an opposite side thereof is made to be the inner side (X1-direction side).
The interval between the mounting substrate 52 and the light guide plate 4 (incident end surface 4a) is held constant (D1) (see
As illustrated in
As illustrated in
Furthermore, as illustrated in
The mounting substrate installation portion 62 of the heat sink 6 is disposed on the outer side (X2-direction side) relative to the light source unit 5. Moreover, the mounting substrate installation portion 62 fixedly holds the mounting substrate 52 (light source unit 5) via the heat dissipating tape 53 (see
As illustrated in
The support portion 64 of the heat sink 6 is formed in a rod shape extending in the vertical direction (Z direction) and is disposed near the mounting substrate installation portion 62. Moreover, as illustrated in
Furthermore, as illustrated in
As illustrated in
As illustrated in
The second biasing member 8a is formed by an elastic material such as silicone. Moreover, the second biasing member 8a comprises a hole portion (not illustrated) for installation to the projecting portion 66. Moreover, the second biasing member 8a is fixedly installed to the heat sink 6 by inserting the projecting portion 66 into the hole portion. Moreover, the second biasing member 8a is compressed by abutting the inner side end surface (X1-direction side end surface) of the convex portion 4c of the light guide plate 4 during installation. As a result, the second biasing member 8a biases the incident end surface 4a of the light guide plate 4 toward a second-spacer-portion 65 side (toward the outer side (X2-direction side)). Thus, the television device 400 separates the incident end surface 4a of the light guide plate 4 and the light source unit 5 by the predetermined distance at the predetermined interval.
As illustrated in
As illustrated in
For example, as illustrated in
The long plate portion 91 of the plate-shaped fixing member 9 is provided across substantially an entire length (substantially an entire length of the incident end surface 4a) of the light guide plate 4 in the Z direction and covers the front-surface side region of the LED 51 and the incident end surface 4a. Thus, the plate-shaped fixing member 9 is reflects the light received from the light source unit 5 to the light-guide-plate 4 side. That is, the plate-shaped fixing member 9 also functions as a reflector.
Next, the movement of the heat sink 6 and the light source unit 5 in conjunction with the expansion and contraction of the light guide plate 4 will be described with reference to
As described above, the light guide plate 4 is positioned on the rear frame 3 in the substantially central position in the longitudinal direction (X direction) by the engagement between the notched engagement portion 4b (see
In this state, when the light guide plate 4 expands due to heat, as illustrated in
According to one or more embodiments of the fourth example, effects such as below can be obtained.
According to one or more embodiments of the fourth example, as above, by providing the plate-shaped fixing member 9 for integrally fixing the incidence-end-surface 4a side of the light guide plate 4 and the heat sink 6 in the state where the distance between the incident end surface 4a and the light source unit 5 is maintained at the predetermined interval (D1 to D2) (see
According to one or more embodiments of the fourth example, as above, the rear frame 3 that supports the heat sink 6 so that the heat sink is movable in the horizontal direction orthogonal to the incident end surface 4a of the light guide plate 4 is provided, and the heat sink 6 moves relative to the rear frame 3 while being separated at the predetermined interval in conjunction with the movement of the incident end surface 4a in the horizontal direction due to the expansion or contraction of the light guide plate 4. Thus, in the situation where the light guide plate 4 expands or contracts due to heat, the heat sink 6 on the incidence-end-surface 4a side of the light guide plate 4 can be stably moved relative to the rear frame 3.
According to one or more embodiments of the fourth example, as above, by the plate-shaped fixing member 9 being installed to the heat sink 6 so that the incidence-end-surface 4a side of the light guide plate 4 is positioned between the plate-shaped fixing member 9 and the heat sink 6, the incidence-end-surface 4a side of the light guide plate 4 and the heat sink 6 are integrally fixed to each other. Thus, in the state where the light guide plate 4 is positioned by the plate-shaped fixing member 9 and the heat sink 6, the heat sink 6 and the light guide plate 4 are fixed; therefore, the heat sink 6 and the light guide plate 4 can be stably and integrally fixed.
According to one or more embodiments of the fourth example, as above, the second spacer portion 65 that is disposed between the incident end surface 4a of the light guide plate 4 and the light source unit 5 and separates the incident end surface 4a and the light source unit 5 by the predetermined distance at the predetermined interval, and the second biasing member 8a that biases the incident end surface of the light guide plate 4 toward the second-spacer-portion 65 side are provided. Thus, in the state where the heat sink 6 that fixedly holds the light source unit 5 and the incidence-end-surface 4a side of the light guide plate 4 are integrally fixed by the plate-shaped fixing member 9, the incident end surface 4a of the light guide plate 4 is biased toward the second-spacer-portion 65 side by the second biasing member 8a; therefore, the function of the spacer that separates the incident end surface 4a of the light guide plate 4 and the light source unit 5 by the predetermined distance at the predetermined interval can be reliably exhibited.
According to one or more embodiments of the fourth example, as above, by providing the plate-shaped fixing member 9 that abuts the surface of the light guide plate 4 on the opposite side of the surface of the light guide plate 4 abutting the heat sink 6 and extends in the direction along the incident end surface 4a of the light guide plate 4, and applying the pressing force on the heat-sink 6 side of the light guide plate 4, the plate-shaped fixing member 9 integrally fixes the incidence-end-surface 4a side of the light guide plate 4 and the heat sink 6. Thus, the plate-shaped fixing member 9 can be made to reliably make surface contact with the light guide plate 4; therefore, the fixed state between the incidence-end-surface 4a side of the light guide plate 4 and the heat sink 6 can be further stabilized.
Next, a fifth example will be described with reference to
As illustrated in
An end portion 206e of the heat sink 206 is formed in a U shape to cover the incident end surface 4a (see
The fixing spacer member 207 is inserted into the opening portion 206d of the heat sink 206. Moreover, the fixing spacer member 207 comprises a fourth engagement portion 207a that engages with the front surface on the Y1-direction side of the light guide plate 4 on the incidence-end-surface 4a side and a fifth engagement portion 207b that engages with the rear surface on the Y2-direction side of the tabular portion 61. The fourth engagement portion 207a is disposed on the front side (Y1-direction side). Moreover, the fourth engagement portion 207a is formed to project to the inner side (X1-direction side) to engage with the front surface of the light guide plate 4. The fifth engagement portion 207b is disposed on the rear side (Y2-direction side). Moreover, the fifth engagement portion 207b is formed in a forked shape divided in the vertical direction (Z direction) and is formed to respectively project to the upper and lower direction sides (Z1-direction side and Z2-direction side) to engage with the rear surface of the heat sink 206.
Furthermore, the fixing spacer member 207 engages the fifth engagement portion 207b with the heat sink 206 and the fourth engagement portion 207a with the light guide plate 4 by being inserted into the opening 206d of the heat sink 206. As a result, the fixing spacer member 207 integrally fixes the incidence-end-surface 4a side of the light guide plate 4 and the heat sink 206.
Furthermore, the fixing spacer member 207 includes a spacer portion 207c that links the fourth engagement portion 207a and the fifth engagement portion 207b. A horizontal direction (X direction) of the spacer portion 207c is a thickness direction of the spacer portion 207c. Moreover, one surface of the spacer portion 207c abuts the incident end surface 4a of the light guide plate 4 and another surface of the spacer portion 207c abuts the mounting surface 52a of the LED 51. Therefore, the fixing spacer member 207 also functions as a member that separates the incident end surface 4a of the light guide plate 4 and the light source unit 5 by a predetermined distance at a predetermined distance.
Other configurations of one or more embodiments of the fifth example are similar to those of the first example.
According to one or more embodiments of the fifth example, effects such as below can be obtained.
According to one or more embodiments of the fifth example, similarly to the fourth example, by providing the fixing spacer member 207 for integrally fixing the incidence-end-surface 4a side of the light guide plate 4 and the heat sink 206 in the state where the distance between the incident end surface 4a and the light source unit 5 is maintained at the predetermined interval, the usage efficiency of light of the television device 500 may be improved.
According to one or more embodiments of the fifth example, as above, a configuration is such that the fourth engagement portion 207a is engaged with the heat sink 206 by inserting the fixing spacer member 207 into the opening portion 206d of the heat sink 206 and the incidence-end-surface 4a side of the light guide plate 4 and the heat sink 206 are integrally fixed by engaging the fifth engagement portion 207b with the light guide plate 4. Thus, by merely inserting the fixing spacer member 207 into the opening portion 206d of the heat sink 206, the fourth engagement portion 207a and the fifth engagement portion 207b respectively engage with the heat sink 206 and the light guide plate 4; therefore, the heat sink 206 and the light guide plate 4 can be easily engaged. Moreover, the heat sink 206 and the light guide plate 4 are engaged by the fixing spacer member 207 itself; therefore, a member for installing the fixing spacer member 207 (for example, a screw) can be eliminated.
Furthermore, According to one or more embodiments of the fifth example, as above, the fixing spacer member 207 also functions as the spacer portion 207c. Thus, the fixing spacer member 207 can be made to also function as the spacer portion 207c; therefore, compared to a configuration where the fixing spacer member 207 and the spacer portion 207c are provided separately, a component count may be reduced.
Furthermore, according to one or more embodiments of the fifth example, as above, the end portion of the heat sink 206 is formed in the U shape to cover the incident end surface 4a of the light guide plate 4 and the upper surface (front surface (surface on Y1-direction side)) near the incident end surface 4a. Thus, the incident end surface 4a of the light guide plate 4 and the upper surface (front surface (surface on Y1-direction side)) near the incident end surface 4a are covered by the U-shaped end portion 206c of the heat sink 206; therefore, the end portion 206c of the heat sink 206 can be made to also function as a reflector that reflects the light from the light source unit 5 toward the light guide plate 4. Thus, the usage efficiency of the light may be further improved.
Other effects of one or more embodiments of the fifth example are similar to those of the fourth example.
Next, a sixth example will be described with reference to
As illustrated in
Other configurations of one or more embodiments of the sixth example are similar to those of the fourth example.
According to one or more embodiments of the sixth example, effects such as below can be obtained.
According to one or more embodiments of the sixth example, similarly to the fourth example, by providing the plate-shaped fixing member 9 for integrally fixing the incidence-end-surface 4a side of the light guide plate 304 and the heat sink 6 in the state where the distance between the incident end surface 4a and the light source unit 5 is maintained at the predetermined interval, the usage efficiency of light of the television device 600 may be improved.
Other effects of one or more embodiments of the sixth example are similar to those of the fourth example.
For example, the television device of one or embodiments of the first example may be provided with the plate-shaped fixing member 9. According to one or more embodiments of the seventh example, as illustrated in
One or more embodiments herein disclosed are examples on all counts and should not be considered limiting. The scope of the present invention is indicated not by the above description of the embodiments but by the scope of patent claims and, further, includes meanings equivalent to the scope of patent claims and all modifications within the scope.
For example, in the first to seventh examples, one or more embodiments are illustrated where the present invention is applied as a television device, but one or more embodiments of the present invention may be applied as a display device other than a television device.
Furthermore, in the first to seventh examples, one or more embodiments are illustrated where positioning of the light guide plate in the X direction is performed by the convex engagement portion of the rear frame and the notched engagement portion of the light guide plate, but the present invention is not limited thereto. According to one or more embodiments, the rear frame and the light guide plate respectively do not need to be provided with the convex engagement portion and the notched engagement portion. Moreover, the convex engagement portion of the rear frame and the notched engagement portion of the light guide plate may be provided in a position other than the central position in the X direction.
Furthermore, in the first, second, and fourth to seventh examples, one or more embodiments are illustrated where the biasing member is formed by a block-shaped elastic material, and in the third example, an example is illustrated where the biasing member is formed by a leaf spring, but the present invention is not limited thereto. According to one or more embodiments, the biasing member does not need to be formed by the block-shaped elastic member or the leaf spring. For example, the biasing member may be formed by a coil spring.
Furthermore, in the first to seventh examples, one or more embodiments are illustrated where a number of biasing members is two for every one heat sink, but the present invention is not limited thereto. According to one or more embodiments, the number of biasing members may be one or three or more relative to one heat sink.
Furthermore, in the first to seventh examples, one or more embodiments are illustrated where the end surface in the horizontal direction of the light guide plate is made to be the incident end surface, but the present invention is not limited thereto. According to one or more embodiments, the end surface of the light guide plate in the lateral direction may be made to be the incident end surface.
Furthermore, in the third example, one or more embodiments are illustrated where the biasing member and the rear frame are integrally formed, but the present invention is not limited thereto. According to one or more embodiments, the biasing member and the heat sink may be integrated.
Furthermore, in the first to third examples, one or more embodiments are illustrated where the heat sink and the support spacer member are made to be separate, but the present invention is not limited thereto. According to one or more embodiments, the heat sink and the support spacer member may be integrated.
Furthermore, in the first to third examples, one or more embodiments are illustrated where the support portion and the spacer portion are provided in the support spacer member, but the present invention is not limited thereto. According to one or more embodiments, the support portion and the spacer portion may be provided in separate members.
Furthermore, in the first to seventh examples, one or more embodiments are illustrated where the rear frame itself becomes the casing that is exposed from the rear to the outside, but the present invention is not limited thereto. According to one or more embodiments, a casing (rear cabinet) that covers the rear frame from the rear of the rear frame may be further installed.
Furthermore, in the fourth, sixth, and seventh examples, one or more embodiments are illustrated where the light guide plate and the heat sink are integrally fixed by the plate-shaped fixing member, and in the fifth example, an example is illustrated where the light guide plate and the heat sink are integrally fixed by the fixing spacer member, but the present invention is not limited thereto. According to one or more embodiments, the light guide plate and the heat sink may be integrally fixed by, for example, a screw.
Furthermore, in the fourth, sixth, and seventh examples, one or more embodiments are illustrated where the heat sink, the support portion, and the spacer portion are integrated, but the present invention is not limited thereto. According to one or more embodiments, the heat sink, the support portion, and the spacer portion may be made to be separate.
Number | Date | Country | Kind |
---|---|---|---|
2014-038092 | Feb 2014 | JP | national |
2014-067720 | Mar 2014 | JP | national |