Patent Application
20050205731
The present invention relates to a flat panel display apparatus such as liquid crystal display apparatus and in particular to a flat panel display apparatus having a display screen which is tiltable into landscape (horizontal) orientation or portrait (vertical) orientation.
Various mechanisms which change the display screen of the flat panel display apparatus such as liquid crystal display apparatus to be tilted into a landscape (horizontal) orientation or portrait (vertical) orientation have heretofore been proposed. A screen orientation changing mechanism of a simple structure which conducts a combination of an operation for turning a display unit with an operation for moving the display unit in a vertical direction without using separate turning mechanism and vertical moving mechanism is disclosed in, for example, JP-A-Hei 11-338363.
In this mechanism, a bar like connecting member which is referred to as “link bar” is disposed between the display unit and a stand. The link bar is mounted at its upper end (rotary axis A) on the stand so that it is rotatable and its rotation angle can be kept. The link bar is mounted at its lower end (rotary axis B) on the display unit in a position offset from the center of the screen of the display unit, so that it is rotatable and its rotation angle can be kept. The display screen can be changed from a landscape (horizontal) orientation to a portrait (vertical) orientation by initially turning the display unit by an angle around the rotary axis B and then turning the display unit around the rotary axis A by an angle a.
However, the changing operation between the landscape and portrait orientation is not completed at one step in the screen orientation changing mechanism of the above-mentioned prior art flat panel display apparatus since it is conducted at two steps of rotary movements by the rotary axes A and B. Specifically if the changing mechanism is applied to large screen display apparatus, an extended period of time and labor is expended. Since the rotation center is not in the vicinity of the center of the screen, the rotary movement of the display unit at this time is larger than that around the central portion of the display unit, so that ease of rotation may be lost. As a result, a process for changing the orientation of the display screen may become very unstable.
The present invention was made in view of the above-mentioned problem. It is therefore, an object of the present invention to provide a flat panel display apparatus which is capable of conducting a transition between the landscape and portrait orientation of the display unit at one step and of capable of turning the display unit around the substantial center of the display unit.
The present invention resides in a flat panel display apparatus including a thin flat display unit having a rectangular shape display screen thereon; a stand unit for supporting said display unit; and a horizontal rotary axis which is secured to said display unit on its rear side in the substantial center thereof and which holds said display unit so that display unit is rotatable by at least 90 relative to said stand unit, characterized in that said display apparatus is provided with translational motion means which causes the translational motion of said display unit in a vertical direction in an interlocking manner with the rotation of said horizontal rotary axis.
The present invention is characterized in that said translational motion means is provided on said stand unit.
The present invention is characterized in that said translational motion means comprises a vertical lifting axis, on which said horizontal rotary axis is rotatably mounted and which is movable in a vertical upward or downward direction, and a cam portion which abuts to said vertical lifting axis and is interlocked with the rotation of said horizontal rotary axis so that it is rotated.
The present invention is characterized in that said vertical lifting axis is provided with a guide for guiding the rotation of said cam portion.
The present invention is characterized in that said stand unit is provided with a guide for guiding the rotation of said cam portion.
The present invention is characterized in that said stand unit is provided with a rotation restriction portion which abuts on a part of said cam portion or said horizontal rotary axis for restricting the range of the rotation of said horizontal rotary axis.
The present invention is characterized in that said stand unit is provided therein with biasing means for biasing said vertical lifting axis in a vertical upward or downward direction to apply a load upon the rotation of said display unit.
The present invention is characterized in that said translational motion means is provided on said horizontal rotary axis.
The present invention is characterized in that said translational motion means comprises a cam portion which abuts on said stand unit in such a manner that said cam portion is movable in a vertical direction and is interlocked with said horizontal rotary axis.
The present invention is characterized in that said stand unit is provided with a guide for guiding the rotation of said cam portion.
The present invention is characterized in that said stand unit is provided with a rotation restriction portion which abuts on a part of said cam portion or said horizontal rotary axis for restricting the range of the rotation of said horizontal rotary axis.
The present invention is characterized in that said translational motion means is provided on both of said display unit and said stand unit.
The present invention is characterized in that said translational motion means comprises at least one projection which is provided on the rear side of said display unit, a vertically movable vertical lifting axis on which said horizontal rotary axis is rotatably mounted, and a rail which is provided on said stand unit for controlling the vertical movement of said vertical lifting axis by guiding the trajectory of said projection which is caused by the rotation of said display unit.
The present invention is characterized in that said rail has substantially rectilinear shape or upwardly convex shape.
The present invention is characterized in that said rail is provided on its inner periphery with a corrugated portion which is engaged in said projection.
The present invention is characterized in that said projection comprises a roller which can be rolled on and along the inner face of said rail while said roller abuts thereon.
The present invention is characterized in that a concave or convex for preventing said projection from escaping from said rail is provided on the inner periphery of said rail or the outer periphery of said projection.
The present invention is characterized in that a fabric material for suppressing the wearing of said rail and said projection is applied on the inner periphery of said rail or outer periphery of said projection.
The present invention is characterized in that said stand unit is provided with biasing means for preventing said vertical lifting axis from abruptly moving in a vertical direction.
The present invention is characterized in that said rail or said projection is provided with biasing means for mitigating the shock due to abrupt rotation of said projection.
Now, a first embodiment of the flat panel display apparatus of the present invention will be described in detail with reference to
As shown in
The stand unit 2 is provided with a translational motion means which causes the translational motion of the display unit 1 in a vertical direction in association with the rotation of the horizontal rotary axis 3 and comprises a vertical lifting axis 21 which is movable in a vertical direction and on which the horizontal rotary axis 3 is rotatably mounted, a cam portion 22 which abuts to the upper end face of the vertical lifting axis 21 and is rotated in association with the rotation of the horizontal rotary axis 3, a biasing means 23 such as spring and the like which biases the lower end face of the vertical lifting axis 21 upwards (toward the cam portion 22), and an interlocking portion 24 which rotates the cam portion 22 in an interlocking manner with the rotation of the horizontal rotary axis 3.
The vertical lifting axis 21, cam portion 22 and biasing means 23 are accommodated in an outer shell 25 of the stand unit 2. The horizontal rotary axis 3 is interlocked with the rotary motion of the display unit 1 so that it is freely rotatable with respect to the vertical lifting axis 21. The rotation of the cam portion 22 is interlocked with the rotation of the horizontal rotary axis 3 via the interlocking portion 24.
In the foregoing structure, the cam portion 22 is provided with an abut portion 221 which abuts to the upper end face of the vertical lifting axis 21, a convex 222 which is provided on the outer peripheral face thereof, and a rotary axis 223 which is interlocked with the horizontal rotary axis 3 via the interlocking portion 24 as shown in
The abut portion 221 is in such a form that the position of the abut portion 221 in which it abuts to the vertical lifting axis 21 is vertically changed depending upon the angular position of the cam portion 22. Accordingly, the rotation angle of the display unit 1 causes the vertical lifting axis 21 to be moved vertically. On the other hand, the convex 222 on the outer peripheral face of the cam portion 22 is engaged with the concave (guide portion) 211 on the upper end face of the vertical lifting axis 21 to suppress the offset between the horizontal rotary axis 3 and the rotary axis 223 of the cam portion 22 as shown in
In order to achieve this guide function, it is possible to properly reverse the concave and convex relationship between the cam portion 22 and the vertical lifting axis 21. In order to stably guide the rotation of the cam portion 22, a concave (guide portion) with which the convex 222 on the outer peripheral face of the cam portion 22 may be provided on, for example, the side of the stand outer shell 25. In this case, it is needless to say that the concave and convex relationship may be properly reversed.
The interlocking portion 24 plays a role to interlock the rotary movement of the horizontal rotary axis 3 with that of the cam portion 221. The interlocking portion 24 is made of, for example, an elastomer material to constrain both axes so that no slack of the interlocking portion is caused. The reason why the elastomer material is adopted resides in that the interlocking portion can cope with the change in the distance between the both axes due to their rotations.
The biasing means 23 is disposed at least on the lower or upper side of the vertical lifting axis 21. The biasing means 23 can impose an appropriate load upon the rotary movement of said display unit 1 and eliminate a vertical play space in the stand unit 2.
The stability of the elevational position of the vertical lifting axis 21 can be enhanced by keeping a balance between the depressing force which is applied upon the vertical lifting axis 21 by the abut portion 221 of the cam portion 22 and strains which are applied on members due to the gravity of the vertical lifting axis 21. If the biasing means 23 is disposed on the upper side of the vertical lifting axis 21, it is expected that the biasing means 23 plays a role to prevent the display unit 1 from colliding with the stand outer shell 25 and the like when the display unit 1 is lifted up.
The cam portion 22 is provided with an engaging piece 224 to prevent the display unit 1 from turning by an angular angle larger than a necessary angle. Turning of the display unit by an angular angle than a necessary angle can be suppressed by the engagement of the engagement piece 224 with a turning restriction portion 251 of the stand unit 2 at a given angular angle of the cam portion 22. The engagement piece may be provided in any position if it is positioned between the rotary member (display unit 1, horizontal rotary axis 3 and the like) and a member which conducts no rotary movement (vertical lifting axis 21, stand outer shell 25 and the like).
Since the flat panel display apparatus of the present embodiment is configured as mentioned above, when the display unit 1 is switched from the landscape orientation in which the display screen is horizontally orientated as shown in
Rotation of the cam portion 22 causes the vertical lifting axis 21 to be lifted or a lowered depending upon the cam contour of the abut portion 221. Since this causes the horizontal rotary axis 3 provided on the vertical lifting axis 21 to be moved vertically, the display unit 1 to which the horizontal rotary axis 3 is secured can conduct the rotary movement so that it is not in contact with the floor on which the stand unit is placed while the screen orientation is changed and so that the elevation of the lower end face of the display unit before and after the change of the screen orientation is substantially same.
As mentioned above, the flat panel display apparatus of the present embodiment is capable of changing the display unit 1 from the landscape orientation to the portrait orientation and vice versa around the substantial central portion of the display unit 1 at one step. Therefore, stable turning operation of the display unit 1 can be achieved without being influenced by the rotary moment due to gravity.
Now, a second embodiment of the flat panel display apparatus of the present invention will be described in detail with reference to
The flat panel display apparatus of the present embodiment comprises a biasing means 23, vertical lifting axis 21 and cam portion 22, which are disposed in a stand outer shell 25 of a stand unit 2 in an order from the top thereof as shown in
The description of the first embodiment may be substantially identical with that of the various functions of the cam portion 22 except that the rotary axis 223 is mounted on the stand outer shell 25, so that it is movable in a vertical direction. Provision of two abutments of the abut portion 221 with the vertical lifting axis 21 and stand unit 2 makes the range of the vertical movement of the vertical lifting axis 21 double as that when the abutment position of the abut 221 is one.
The biasing means 23 is provided on the vertical lifting axis 21 (opposite to the cam portion 22), so that it suitably abuts on the top face of the stand outer shell portion 25. The biasing means 23 serves to prevent the collision between the vertical lifting axis 21 and the stand outer shell portion 25 when the display unit 1 is abruptly lifted. The vibration sound which is caused by the vibration between the cam portion 22 and the vertical lifting axis 21, the stand outer shell portion 25 can be reduced by the suitable spring biasing force of the biasing means 23.
In
The stand unit 2 is provided with translational motion means (vertical lifting axis 21, cam portion 22, biasing means 23) in the flat panel display apparatus of the present embodiment similarly to the first embodiment. This makes it possible to adjust the elevational position of the horizontal rotary axis 3 depending upon the rotation of the display unit 1 without adding any special design to the display unit 1. The display unit 1 can be turned so that it is not in contact with the floor on which the apparatus is placed and the elevational position of the lower end of the display unit 1 is substantially same before and after the change of the orientation of the display unit 1.
A transitional operation of the display unit 1 between the landscape and portrait orientation can be conducted at only one step in the flat panel display apparatus of the present embodiment. Since turning of the display unit 1 around the substantial center thereof can be conducted, stable turning of the display unit 1 can be conducted without being influenced by the rotational moment due to gravity.
Now, a third embodiment of a flat panel display apparatus of the present invention will be described in detail with reference to
The flat panel display apparatus of the present embodiment of
As shown in
The flat panel display apparatus of the present embodiment is configured so that the horizontal rotary axis 3 is provided with the cam portion 31 as mentioned above. This makes it possible to move horizontal rotary axis 3 in a vertical direction in an interlocking manner with the rotation of the display unit 1 without adding any special design to the display unit 1 and it is possible to adjust elevational position of the display unit 1 depending upon its rotation angle. The display unit 1 can be turned so that it is not in contact with the floor on which the apparatus is placed and the elevational position of the lower end of the display unit 1 is substantially same before and after the change of the orientation of the display unit 1.
A transitional operation of the display unit 1 between the landscape and portrait orientation can be conducted at only one step in the flat panel display apparatus of the present embodiment. Since turning of the display unit 1 around the substantial center thereof can be conducted, stable turning of the display unit 1 can be conducted without being influenced by the rotational moment due to gravity. The structure of the present embodiment is simpler than those of the fore-going first and second embodiments and reduction in cost can be achieved.
Now, a fourth embodiment of the flat panel display apparatus of the present invention will be described in detail with reference to
As shown in
For the reason which is similar to those in the above-mentioned first and second embodiments, a biasing means may be provided on or under the vertical lifting axis 21 according to needs. Herein, the biasing means 23 is provided under the vertical lifting axis 21. The vertical lifting axis 21 and the biasing means 23 are accommodated within the stand outer shell 25 and the rail 28 is firmly secured to the stand outer shell 25.
The principle of the operation of the present embodiment will be described. The vertical lifting axis 21 is moved in a vertical direction by using a force which is applied between the projection 11 and the rail 28 during the rotation of the display unit 1. The projection 11 is moved on the rail while it abuts on the inner periphery of the rail 281. Conversely, when the display unit 1 is lifted upwardly, the projection 11 abuts on the inner periphery 281 of the rail to apply forces to each other to cause the rotation thereof. The projection 11 is moved on the rail while it abuts on the inner periphery 281 of the rail. In order to efficiently function this mechanism, various structures which will be described are provided.
The rail 28 has inner periphery 281 of the rail to which the projection 11 abuts. The inner periphery 281 of the rail is preferably in the substantially linear shape or substantially upwardly convex shape. The reasons are as follows:
Since the center of the rotation is a fixed point which is not movable in a lateral and vertical directions in the prior art simple rotation, the trajectory of the projection 11 which is traced by the rotation is a downwardly convex arch when the projection 11 is located in the left and lower position as viewed in the rear view of
The rail 28 forcedly corrects the trajectory of the projection 11 which has heretofore been in the downwardly convex shape in association with the rotation into substantially upwardly convex or substantially linear shape. Since the horizontal rotary axis 3 is moved as spaced at a given distance from the projection 11 during this operation, the horizontal rotary axis 3 which is movable only in a vertical direction by the vertical lifting axis 21 traces the trajectory which is moved upwardly to pass through the highest point and is then lowered.
In other words, some positional energy to lift the whole of the display unit is necessary to cause the movement from the orientation of
The inner periphery 281 of the rail may be corrugated in shape as shown in
The inner periphery 281 of the rail may be provided on its sectional face with an abut portion 282 which is concave in section and abut on the projection 11, and a guide 283 which is concave in section for guiding the movement of the projection 11 as shown in
The inner periphery 281 of the rail or the roller 111 may be provided on its outer periphery with a sound absorbing layer 284 and 112 made of a sound absorbing material such as felt. In this case, wearing of the rail and the projection 11 can be prevented and abutting sound which is generated on rotation of the roller 111 of the projection 11 can be reduced or eliminated.
In the present embodiment, biasing means 285 and 286 such as spring parts and the like are also disposed at the both ends of the rail 28 in addition to the biasing means 23 which is provided under the vertical lifting axis 21 of the stand unit 2. The biasing means 23 abuts on the vertical lifting axis 21 and the biasing means 285 and 286 abut on the projection 11 for absorbing the shock due to abrupt movement during the vertical translational motion and the rotation. The biasing means may be provided on the projection 11. If the biasing means 23 are provided on both upper and lower sides of the vertical lifting axis 21, the stability of the motion of the vertical lifting axis 21 can be further enhanced.
Since the distance between the horizontal rotary axis 3 and the projection 11 is made constant by configuring the flat panel display apparatus of the present embodiment so that both the display unit 1 and the stand unit 2 are provided with translational motion means, the projection 11 is moved on the rail 28 in association with the rotation of the display unit. As a result, the vertical lifting axis 21 is moved in a vertical upward or downward direction, so that the horizontal rotary axis 3 provided on the vertical lifting axis 21 can also be moved in a vertical upward or downward direction.
This makes it possible to adjust the elevational position of the display unit 1 depending upon the rotation of the display unit 1 and the display unit 1 can be turned so that it is not in contact with the floor on which the apparatus is placed and the elevational position of the lower end of the display unit 1 is substantially same before and after the change of the orientation of the display unit 1.
A transitional operation of the display unit 1 between the landscape and portrait orientation can be conducted at only one step in the flat panel display apparatus of the present embodiment. Since turning of the display unit 1 around the substantial center thereof can be conducted, stable turning of the display unit 1 can be conducted without being influenced by the rotational moment due to gravity.
Although the first to fourth embodiments of the present invention in which the vertical upward or downward translational motion of the display unit 1 caused by the rotation of the display unit 1 is achieved by a mechanism have been described, means for interlocking the rotation of the display unit with the translational motion thereof may be implemented by an electronic control using a microcomputer and the like as well as a mechanism. It is possible to effectively extend the vertical moving range by combination of the above-mentioned embodiments.
Since the flat panel display apparatus of the present invention is formed as mentioned above, a transition of the display screen between the landscape and portrait orientation can be achieved at only one step. Since the horizontal rotary axis is provided on the substantially central portion of the display unit, stable rotation of the display unit can be conducted without being influenced by the rotational moment thereof. Since the display unit is movable in an upward and downward direction, the display unit can be positioned in an optimal elevational position while it is in the portrait or landscape orientation.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2002241571 | Aug 2002 | JP | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/JP03/10193 | 8/8/2003 | WO | 8/30/2004 |
