Patent Application
20120257119
The present invention relates to a lighting device, a display device and a television receiver.
In recent years, a thin display element, such as a liquid crystal panel and a plasma display panel, is used as a display element of an image display device. This enables the image display device to have a reduced thickness. When the liquid crystal panel is used as the display element, the liquid crystal panel requires a lighting device (backlight device) as a separate lighting device, because the liquid crystal panel does not emit light.
One example of the lighting device is described in Patent Document 1. The lighting device described in Patent Document 1 includes a plurality of light sources (LEDs, for example) arranged on a side end portion (side edge) of the lighting device, and a light guide plate through which the light emitted from the light sources exits toward a display surface of the liquid crystal panel. The light sources are arranged so as to face a light entrance surface of the light guide plate. The light that enters through the light entrance surface is totally reflected repeatedly within the light guide plate, so that the light is guided and then exits from the light exit surface.
A lighting device that includes a reflection-type polarizing sheet arranged to cover the light exit surface of the light guide plate is also known. In such a lighting device, the reflection-type polarizing sheet transmits p-wave of the light exiting from the light exit surface of the light guide plate and reflects s-wave toward the light guide plate. The reflected s-wave is reflected again by a light reflector (light reflective sheet, for example) that is provided on a surface opposite to the light exit surface of the light guide plate. At that time, the reflected s-wave separates into p-wave and s-wave. Accordingly, the reflection-type polarizing sheet allows the s-wave that is normally absorbed by a polarizing plate included in the liquid crystal panel to be reflected toward the light guide plate and to be reused. Thus, improved brightness is achieved.
Although most of the rays of light emitted from a light source enter a light guide plate through a light entrance surface, some of the rays of light may not enter the light entrance surface and may reach an end portion of a reflection-type polarizing sheet in some cases. Such rays of the light are likely to enter the light guide plate through portions other than the light entrance surface after being reflected by the end portion of the reflection-type polarizing sheet, and then exit from a light exit surface of the light guide plate. Generally, the light guide plate is configured such that the light exiting through the light exit surface shows a predetermined brightness distribution when the rays of light emitted from the light source enter entirely through the light entrance surface. Thus, when the rays of light enter the light guide plate through the portions other than the light entrance surface and exit locally as above, uneven brightness may occur. Especially, the light that enters the light guide plate through the portion other than the light entrance surface via the reflection-type polarizing sheet as above is highly likely to appear locally on an end portion of the light exit surface that is located closer to the light source, that is, on a light-source-side end portion of the light exit surface. This increases the brightness of the light-source-side end portion of the light exit surface compared with the surrounding area. Thus, uneven brightness may occur.
The present invention was accomplished in view of the above circumstances. It is an object of the present invention to provide a lighting device that can suppress uneven brightness. Further, it is another object of the present invention to provide a display device and a television receiver each including the lighting device.
To solve the above problem, a lighting device of the present invention includes a light source having a light emitting surface, a light guide plate having a light entrance surface and a light exit surface, and a reflection-type polarizing sheet covering at least a part of the light exit surface of the light guide plate. The light entrance surface faces the light emitting surface of the light source and through which light emitted from the light source enters the light guide plate. The light in the light guide plate exits through the light exit surface. The reflection-type polarizing sheet is arranged such that a light-source-side peripheral end thereof is located farther from the light source than a light-source-side peripheral end of the light guide plate. Accordingly, a peripheral end portion of the light guide plate has a sheet-non-overlapping area that does not overlap with the reflection-type polarizing sheet.
In the lighting device according to the present invention, the peripheral end portion of the light guide plate has the sheet-non-overlapping area. This suppresses that the rays of light emitted from the light source that do not enter the light entrance surface and reach the peripheral end portion of the light guide plate are reflected by the peripheral end portion of the reflection-type polarizing sheet. With this configuration, the light that does not enter the light entrance surface is less likely to appear locally on the light exit surface of the light guide plate after being reflected by the peripheral end portion of the reflection-type polarizing sheet. Thus, uneven brightness is less likely to occur.
The above lighting device may further include a light absorber configured to absorb light. The light absorber is arranged so as to cover the sheet-non-overlapping area. Some of the rays of light emitted from the light source may not enter the light entrance surface, but reach the peripheral end portion of the light exit surface and pass through the sheet-non-overlapping area. According to this configuration, the rays of light are absorbed by the light absorber covering the sheet-non-overlapping area. By absorbing the light that does not enter the light entrance surface, the light is surely less likely to appear locally on the light exit surface of the light guide plate.
The lighting device may further include a housing member configured to house the light source, the light guide plate, and the reflection-type polarizing sheet. The light absorber may be apart of the housing member that faces the light exit surface of the light guide plate and has a black color. In the case where the light absorber is a part of the housing member that is colored black, a light absorber as a separate member is not required. This reduces the component cost.
The lighting device may further include a light scattering reflector configured to reflect and scatter light. The light scattering reflector is arranged so as to cover the sheet-non-overlapping area. Some of the rays of light emitted from the light source may not enter the light entrance surface, but reach the peripheral end portion of the light exit surface and pass through the sheet-non-overlapping area. According to this configuration, the rays of light are reflected and scattered by the light scattering reflector covering the sheet-non-overlapping area. By reflecting and scattering the light that does not enter the light entrance surface, the light is less likely to appear locally on the light exit surface of the light guide plate. In addition, since the rays of light that do not enter the light entrance surface are reused, the light use efficiency is improved.
Next, to solve the above problem, a lighting device according to another aspect of the present invention includes a light source having a light emitting surface, a light guide plate having a light entrance surface and a light exit surface, a reflection-type polarizing sheet covering at least a part of the light exit surface of the light guide plate, and a light scattering reflector configured to scatter and reflect light. The light entrance surface faces the light emitting surface of the light source and through which light enters the light guide plate. The light in the light guide plate exits through the light exit surface. The light scattering reflector is arranged so as to cover a light-source-side peripheral end portion of a light-source-side surface of the reflection-type polarizing sheet.
In such a lighting device, some of the rays of light emitted from the light source may not enter the light entrance surface, but reach a space between the light exit surface and the reflection-type polarizing sheet. In such a case, the rays of light are reflected by the light scattering reflection sheet. By reflecting and scattering the light that does not enter the light entrance surface, the light is less likely to appear locally on the light exit surface of the light guide plate. This suppresses uneven brightness. In addition, since the rays of light that do not enter the light entrance surface are reused by being reflected and scattered, the light use efficiency is improved.
Next, to solve the above problem, a lighting device according to another aspect of the present invention includes a light source having a light emitting surface, a light guide plate having a light entrance surface and a light exit surface, a reflection-type polarizing sheet covering at least a part of the light exit surface of the light guide plate, and a light absorber configured to absorb light. The light entrance surface faces the light emitting surface of the light source and through which light enters the light guide plate. The light in the light guide plate exits through the light exit surface. The light absorber is arranged so as to cover a light-source-side peripheral end portion of a light-source-side surface of the reflection-type polarizing sheet.
In such a lighting device, some of the rays of light emitted from the light source may not enter the light entrance surface, but reach a space between the light exit surface and the reflection-type polarizing sheet. In such a case, the rays of light are absorbed by the light absorber. By absorbing the light that does not enter the light entrance surface, the light is surely less likely to appear locally on the light exit surface of the lighting device. This suppresses uneven brightness.
An example of the light source is a light emitting diode. This improves brightness and reduces power consumption.
To solve the above problem, a display panel according to the present invention includes the above-described lighting device and a display panel configured to provide display using light from the lighting device.
An example of the display panel is a liquid crystal panel. Such a display device as a liquid crystal display device has a variety of application, such as a television display or a display of a desktop personal computer. Particularly, it is suitable for a large screen display.
To solve the above problem, a television receiver according to the present invention includes the above display device.
According to the present invention, a lighting device that can suppress uneven brightness, a display device and a television receiver each including such a lighting device can be provided.
The first embodiment of the present invention will be described with reference to
As illustrated in
As illustrated in
Next, the backlight device 34 will be explained. As illustrated in
The backlight chassis 32 has a substantially box-like shape with an opening on the front side (a light exit side, the liquid crystal panel 12 side). The optical member 40 is arranged so as to cover the opening of the backlight chassis 32. The front chassis 16 has a rectangular frame shape having an opening 16a through which the optical member 40 is exposed to the front side. The front chassis 16 is arranged so as to enclose the optical member 40 in a plan view. On an inner peripheral end portion of the front chassis 16, a stepped portion 17 is provided. A peripheral edge portion of the liquid crystal panel 12 is placed on the stepped portion 17. With this configuration, the light exiting from a light exit surface 50A (which will be described later) of the light guide plate 50 passes through the optical member 40, and then is applied to a rear surface of the liquid crystal panel 12 through the opening 16a.
The backlight chassis 32 is made of metal such as an aluminum material. The backlight chassis 32 includes a bottom plate 32a having a rectangular shape in a plan view, and side plates 32b, 32c each of which rises from an outer edge of the corresponding long or short sides of the bottom plate 32a toward the front side. The long side of the bottom plate 32a matches a horizontal direction (X-axis direction) and the short side thereof matches a vertical direction (Y-axis direction). On a rear surface of the bottom plate 32a, a power circuit board (not illustrated) that supplies power to the LED unit 26 is attached, for example.
The LED unit 26 is attached to an inner surface of one of the side plates 32b of the backlight chassis 32 that extends along the long-side direction (X-axis direction) with screws, for example. As illustrated in
As illustrated in
The LED 22 is configured by sealing LED chips as light emitting elements onto a housing with a resin material. For example, the LED 22 includes three different kinds of LED chips each having a different main emission wavelength. Specifically, each of the LED chips emits a single color of light of red (R), green (G) or blue (B). The LED 22 is not limited to the above configuration, and may have another configuration. The LED 22 may only include an LED chip that is configured to emit light in a single color of blue (B) and covered with a resin containing a phosphor having a light emitting peak in a red (R) range and a phosphor having a light emitting peak in a green (G) range, for example, silicon. Alternatively, the LED 22 may include an LED chip that is configured to emit light in a single color of light of blue (B) and covered with a resin containing a YAG phosphor that emits yellow light, for example, silicon.
The LED board 24 is made of synthetic resin. Surfaces (including a surface facing the light guide plate 50) of the LED board 24 have a white color that provides high light reflectivity. As illustrated in
A wiring pattern (not illustrated) made of metal film is provided on the LED board 24 and the LEDs 22 are mounted on predetermined positions of the LED board 24. A control board, which is not illustrated, is connected to the LED board 24. The control board supplies the power required to turn on the LEDs 22 and controls the drive of the LEDs 22.
The light guide plate 50 is a plate-like member having a rectangular shape in a plan view. The long side of the light guide plate 50 extends along the long-side direction (X-axis direction) of the backlight chassis 32. The light guide plate 50 is made of a resin such as acrylic that has a high light transmission (high transparency). As illustrated in
A plurality of light reflective portions 51 are provided on a surface 50B (rear surface 50B) of the light guide plate 50 that is opposite from the light exit surface 50A. The light reflective portions 51 are arranged in a dotted pattern having a white color. The light reflective portions 51 are configured to reflect and scatter the light. Accordingly, some of the rays of light that travel toward the light exit surface 50A after being reflected and scattered by the light reflective portions 51 has an entrance angle that is not above the critical angle (some of the rays of light are not reflected), and thus the light can exit toward the liquid crystal panel 12 through the light exit surface 50A. The light reflective portions 51 are, for example, configured by arranging the dots in a zigzag pattern (grid pattern, staggered pattern). The dots are formed by printing metal oxide pastes on the rear surface 50B of the light guide plate 50, for example. Preferable examples of the printing method of the dots include screen printing and ink-jet printing.
With the above configuration, the light emitted from the light emitting surface 22A of each LED 22 enters the light guide plate 50 through the light entrance surface 50D of the light guide plate 50, and then is guided within the light guide plate 50 due to the total reflection and is reflected and scattered by the light reflective portion 51. Thus, the light exits from the light exit surface 50A. Then, the light exiting from the light exit surface 50A is applied to the rear surface of the liquid crystal panel 12 after passing through the optical member 40. The light reflective portions 51 are provided on an area corresponding to the opening 16a of the front chassis 16 (an area overlapping with the opening 16a with a plan view), for example.
A light reflection sheet 30 is arranged on the bottom plate 32a of the backlight chassis 32. The light reflection sheet 30 has a rectangular shape in a plan view. The light reflection sheet 30 is arranged so as to cover almost entire of the rear surface 50B of the light guide plate 50 and a rear surface of the LED unit 26. The light reflective sheet 30 is made of a synthetic resin, for example, and includes a front surface having a white color that provides high light reflectivity. The light exiting from the light guide plate 50 to the light reflective sheet 30 is reflected again toward the light exit surface 50A by the light reflective sheet 30. This improves light use efficiency. The light reflective sheet 30 also has a function of reflecting the light that is emitted from the LED 22 to the light reflective sheet 30 so as to enter the light entrance surface 50D of the light guide plate 50. The material and color, for example, of the light reflective sheet 30 are not limited to those of the present embodiment. Any light reflective sheets that can reflect the light may be used.
The optical member 40 is arranged so as to cover the front surface of the light exit surface 50A of the light guide plate 50. The optical member 40 includes a diffuser sheet 41, a prism sheet 42, and a reflection-type polarizing sheet 43 arranged in this sequence from the light exit surface 50A side. The diffuser sheet 41 may be configured by bonding a diffusion layer including light scattering particles dispersed therein onto a front surface of a light transmissive board made of synthetic resin. The diffuser sheet 41 diffuses the light that exits from the light exit surface 50A. The prism sheet 42 controls the traveling direction of the light that passed through the diffuser sheet 41.
The reflection-type polarizing sheet 43 has a multilayer structure in which layers having different reflective indexes are alternately arranged, for example. The reflection-type polarizing sheet 43 transmits p-wave of the light exiting through the light exit surface 50A and reflects s-wave toward the light guide plate 50. The s-wave reflected by the reflection-type polarizing sheet 43 is reflected again toward the front side by the light reflection sheet 30, for example. At this time, the reflected s-wave separates into s-wave and p-wave. As described above, the reflection-type polarizing sheet 43 allows the s-wave that is normally absorbed by the polarizing plate of the liquid crystal panel 12 to be reused by reflecting the s-wave toward the light guide plate side. This improves light use efficiency (and thus brightness). An example of the reflection-type polarizing sheet 43 is a product named “DBEF” that is manufactured by Sumitomo 3M Limited. The reflection-type polarizing sheet 43 is not limited to the above configuration. Any reflection-type polarizing sheet that allows the rays of light exiting from the light exit surface 50A to be reflected toward the light guide plate 50 to be reused may be employed.
As illustrated in
As illustrated in
In other words, the reflection-type polarizing sheet 43 is configured to cover not the entire surface, but a part of the light exit surface 50A of the light guide plate 50. Thus, an LED-side end portion of the light exit surface 50A has a sheet-non-overlapping area T1 where the reflection-type polarizing sheet 43 does not overlap. The sheet-non-overlapping area T1 corresponds to an area defined by the LED-side peripheral end 43A of the reflection-type polarizing sheet 43 and the light exit surface 50D. In the present embodiment, the sheet-non-overlapping area T1 extends along the X-axis direction (an arrangement direction of LEDs 22).
The surfaces of the above front chassis 16 have a black color that provides high light absorption. Thus, the stepped portion 17 that is a part of the front chassis 16 has a black color. The stepped portion 17 is configured as a light absorber that is arranged to face the light exist surface 50A of the light guide plate 50 and cover the sheet-non-overlapping area T1 from the front side. The light absorber may be provided by coloring a surface of the stepped portion 17 that faces the light exit surface 50A of the light guide plate 50 black.
Next, advantages obtained by the present embodiment will be explained. First, an advantage obtained by the sheet-non-overlapping area T1 that is provided at the LED-side end portion of the light exit surface 50A will be explained with reference to
In this configuration, some of the rays of light emitted from the LED 22 may not enter the light entrance surface 50D of the light guide plate 50 and travel more to the front than the light entrance surface 50D (indicated by an arrow L2 in
Generally, the light guide plate 50 is configured to have a predetermined brightness distribution when the light emitted from the LED 22 enters entirely through the light entrance surface 50D. The light that enters through the other portion than the light entrance surface 50D as above may cause uneven brightness. The light L2 that enters the light guide plate 50 via the reflection-type polarizing sheet 43, which is not the light entrance surface 50D, tends to be concentrated in the LED-side end portion of the light exit surface 50A that is an end portion closer to the LED 22 (in other words, in the vicinity of the opening 16a of the front chassis 16). Accordingly, the brightness of the LED-side end portion increases and uneven brightness may occur.
In view of the above, the backlight device 34 of the present embodiment is configured such that the LED-side end portion of the light exit surface 50A has the sheet-non-overlapping area T1. Some of the rays of light emitted from the LED 22 may not enter the light entrance surface 50D of the light guide plate 50, but travel more to the front than the light entrance surface 50D (indicated by an arrow L1 in
Then, the light L1 passing through the sheet-non-overlapping area T1 reaches a rear surface 17B (a surface facing the light guide plate 50) of the stepped portion 17 (light absorber) of the front chassis 16, which covers the sheet-non-overlapping area T1 from the front side. In the present embodiment, the stepped portion 17 has a black color, so that the stepped portion 17 absorbs the light L1 that reaches the rear surface 17B thereof. This suppresses the reflection of the light L1 by the front chassis 16, and thus surely suppresses the entrance of the light L1 into the light guide plate 50.
The backlight device 34 of the present embodiment includes the housing member 15 housing the LEDs 22, the light guide plate 50, and the reflection-type polarizing sheet 43. The light absorber is formed by coloring a part of the housing member 15 (the stepped portion 17) that faces the light exit surface 50A of the light guide plate 50 black. By forming the light absorber by coloring apart of the housing member 15 black, a light absorber as a separate member is not required. Thus, the component cost can be reduced. Note that the part in which the light absorber is formed is not limited to the stepped portion 17.
Next, the second embodiment of the present invention will be described with reference to
The light scattering reflection sheet 217 is a light diffusive resin composition in which light diffusive particles including aluminum borate or titanium oxide are dispersed in a base material made of polyethylene terephthalate (PET) resin or polycarbonate (PC) resin, for example. The light scattering reflection sheet 217 is not limited to the above configuration, and may employ any configuration that can scatter and reflect the light. The light scattering reflection sheet 217 is attached to the rear surface of the stepped portion 17. The light scattering reflection sheet 217 has a size that can cover the entire area of the sheet-non-overlapping area T1 from the front side (in other words, a shape elongated in the X-axis direction). Note that the light scattering reflection sheet 217 may be configured to cover only a part of the sheet-non-overlapping area T1.
Some of the rays of light emitted from the LED 22 may not enter the light entrance surface 50D, but reach the light exit surface 50A side (the front side of the light guide plate 50). According to the configuration of this embodiment, the rays of light are reflected and scattered by the light scattering reflection sheet 217 toward the light guide plate 50 after passing through the sheet-non-overlapping area T1. By reflecting and scattering the rays of light that do not enter the light entrance surface 50D, the light is less likely to appear locally on the light exit surface 50A of the backlight device 234. In addition, the light use efficiency is improved since the light that does not enter the light entrance surface 50D is reused by the reflection toward the light guide plate 50.
Instead of providing the light scattering reflection sheet 217, the light scattering reflector may be formed by printing a paste having a function of reflecting and scattering the light (for example, metal oxide paste having a white color) on the rear surface of the stepped portion 17.
Alternatively, a light absorptive sheet 218 (light absorber) may be provided instead of the light scattering reflection sheet 217. The light absorptive sheet 218 may include a plate made of PET resin having a surface colored black that provides high light absorption. Some of the rays of light emitted from the LED 22 may not enter the light entrance surface 50D of the light guide plate 50 and reach the space between the light exit surface 50A and the reflection-type polarizing sheet 43. According to the configuration of this embodiment, the light is absorbed by the light absorptive sheet 218. This suppresses that the rays of light that do not enter the light entrance surface 50D is reflected by the reflection-type polarizing sheet 43. Thus, the light is less likely to appear locally on the light exit surface 50A, leading to the suppression of the uneven brightness. Note that the light absorptive sheet 218 is not limited to the above configuration, and may employ any configuration that can absorb light.
Next, the third embodiment of the present invention will be described with reference to
A light scattering reflection sheet 345 (light scattering reflector) is arranged between the reflection-type polarizing sheet 343 and the prism sheet 42. The light scattering reflection sheet 345 is, for example, a light diffusive resin composition in which light diffusive particles including aluminum borate or titanium oxide are dispersed in a base material made of polyethylene terephthalate (PET) resin or polycarbonate (PC) resin, for example.
The light scattering reflection sheet 345 has a shape elongated in the X-axis direction (the arrangement direction of the LEDs 22). The light scattering reflection sheet 345 is arranged on a rear surface 343A of the reflection-type polarizing sheet 343 (a light-source-side surface of the reflection-type polarizing sheet) so as to cover the LED-side peripheral end portion of the reflection-type polarizing sheet 343. A right peripheral end of the light scattering reflection sheet 345 in
Some of the rays of light (indicated by an arrow L3 in
Instead of providing the light scattering reflection sheet 345, the light scattering reflector may be formed by printing a paste having a function of reflecting and scattering the light (for example, metal oxide paste having a white color) on the LED-side peripheral end portion of the rear surface (the light-source-side surface) of the reflection-type polarizing sheet 343.
Alternatively, alight absorptive sheet 346 (light absorber) may be provided instead of the light scattering reflection sheet 345. The light absorptive sheet 346 may include a plate made of PET resin having a surface colored black that provides high light absorption. The light absorptive sheet 346 is not limited to the above configuration, but may employ any configuration that can absorb light. Some of the rays of light emitted from the LED 22 (indicated by an arrow L3 in
Instead of the light absorptive sheet 346, a light shielding sheet that has low light absorption may be used. The light shielding sheet can prevent the rays of light that do not enter the light entrance surface 50D from reaching the LED-side peripheral end portion of the rear surface of the reflection-type polarizing sheet 343. Thus, the rays of light that do not enter the light entrance surface 50D are less likely to be reflected by the rear surface of the reflection-type polarizing sheet 343.
The present invention is not limited to the embodiments explained in the above description with reference to the drawings. The following embodiments may be included in the technical scope of the present invention, for example.
(1) In the above embodiments, the LED unit 26 is provided on only one of the side plates 32b, 32c of the backlight chassis 32, but may be provided on two or more of the side plates 32b, 32c. In such a case, each of the peripheral end portions of the reflection-type polarizing sheet 43 that faces the corresponding LED unit 26 (LEDs 22) includes the sheet-non-overlapping area T1.
(2) In the above third embodiment, the light scattering reflection sheet 345 (or the light absorptive sheet 346) is arranged between the reflection-type polarizing sheet 343 and the prism sheet 42, but not limited to this configuration. The light scattering reflection sheet 345 (light scattering reflector) or the light absorptive sheet 346 (light absorber) may have any configuration that covers the LED-side peripheral end portion of the rear surface (the light-source-side surface) of the reflection-type polarizing sheet 343. The light scattering reflection sheet 345 (or the light absorptive sheet 346) may be arranged between the diffuser sheet 41 and the prism sheet 42.
(3) The backlight chassis 32 and the front chassis 16 included in the housing member 15 may be an integral member.
(4) The configuration of the optical member 40, 340 is not limited to the above embodiments. The optical member 40, 340 may include a diffuser plate or a lens sheet. All that is required for the optical member 40, 340 is to include the reflection-type polarizing sheet. Any other sheet than the reflection-type polarizing sheet may be provided or may not be provided. In addition, the number of such sheet may be suitably determined.
(5) In the above embodiments, the LED 22 (light emitting diode) is used as a light source, but light sources other than LED such as a cold cathode tube may be used.
(6) In the above embodiments, TFTs are used as switching components of the liquid crystal display device. However, the technology described above can be applied to liquid crystal display devices including switching components other than TFTs (e.g., thin film diode (TFD)). Moreover, the technology can be applied to not only color liquid crystal display devices but also black-and-white liquid crystal display devices.
(7) In the above embodiments, the liquid crystal display device including the liquid crystal panel as a display panel is used. The technology can be applied to display devices including other types of display panels.
(8) In the above embodiments, the television receiver including the tuner is used. However, the technology can be applied to a display device without a tuner.
10, 210, 310: liquid crystal display device (display device), 12: liquid crystal panel (display panel), 15: housing member, 17: stepped portion (portion facing light exit surface of light guide plate), 22: LED (light source), 22A: light emitting surface, 34, 234, 334: backlight device (lighting device), 43, 343: reflection-type polarizing sheet, 43A: LED-side peripheral end (light-source-side peripheral end of reflection-type polarizing sheet), 50: light guide plate, 50A: light exit surface, 50D: light entrance surface, 217: light scattering reflection sheet (light scattering reflector arranged to cover sheet-non-overlapping area), 218: light absorptive sheet (light absorber arranged to cover sheet-non-overlapping area), 343A: rear surface of the reflection-type polarizing sheet (light-source-side surface of reflection-type polarizing sheet), 345: light scattering reflection sheet (light scattering reflector arranged to cover light-source-side peripheral end portion of reflection-type polarizing sheet), 346: light absorptive sheet (light absorber arranged to cover light-source-side peripheral end portion of reflection-type polarizing sheet), T1: sheet-non-overlapping area, TV: television receiver
| Number | Date | Country | Kind |
|---|---|---|---|
| 2009-291568 | Dec 2009 | JP | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/JP2010/070447 | 11/17/2010 | WO | 00 | 6/12/2012 |
