JP2008129474A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device in which occurrence of display unevenness is prevented by preventing compression force from being applied to a specific place of a liquid crystal panel, even when the dimension of a member such as a frame is reduced due to lowering of temperature. <P>SOLUTION: In the case in which a frame 12a is formed of a material with a thermal expansion coefficient larger than that of a chassis 11a, protruding guides 1141, 1142 to position and/or to hold the display panel 13 are formed on a side wall 112 of the chassis 11a, the guides 1141, 1142 are made to protrude further to the front side from the frame 12a mounted on the front side of the chassis 11a, and the display panel 13 to be arranged on the front side of the frame 12a is positioned and/or held with the guides 1141, 1142. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a display device, and particularly preferably relates to a display device including a liquid crystal panel as a display panel.

  FIG. 13 is an exploded perspective view schematically showing a conventional example of a configuration of a main part of a liquid crystal display device including a transmissive liquid crystal panel. The liquid crystal display device 9 shown in FIG. 13 includes a chassis 91 formed in a tray shape with a shallow bottom, a frame 92 formed in a substantially quadrilateral frame shape, a transmissive liquid crystal panel 93, and other predetermined predetermined components. A member. A frame 92 is arranged on the front side of the chassis 91, and a liquid crystal panel 93 is arranged on the front side.

  Projected guides 921 are provided at predetermined positions on each side of the frame 92, and the liquid crystal panel 93 is disposed in a region surrounded by these guides 921. Thus, the liquid crystal panel 93 is positioned and held by the guide 921 provided on the frame 92.

  The frame 92 includes a frame formed by pressing a metal plate material and a frame 92 formed by molding a resin material. In particular, a frame made of a resin material has been widely used in recent years because it is low in manufacturing cost and can be molded into a complicated shape. However, the following problems may occur in a liquid crystal display device using a frame formed of a resin material.

  A general liquid crystal panel has a configuration in which a pair of substrates, specifically, for example, a TFT array substrate and a color filter are arranged to face each other with a predetermined minute interval. A liquid crystal is filled between the pair of substrates. If the distance between the pair of substrates (that is, the cell gap) is not uniform, display unevenness may occur on the screen. For this reason, it is necessary to maintain the cell gap of the liquid crystal panel uniformly over the entire surface so that display unevenness does not occur.

  By the way, when the temperature of the environment in which the display device is used decreases, the size of each side of the frame decreases with this temperature decrease. And according to the change of this dimension, the space | interval of the guide provided in each side also becomes small. The thermal expansion coefficient of the resin material is generally larger than that of glass or metal. Therefore, the amount of shrinkage of the frame formed of the resin material due to the decrease in temperature is larger than that of the chassis formed of metal, the TFT array substrate of the liquid crystal panel formed of glass, and the color filter.

  For this reason, when the temperature of the environment in which the display device is used decreases and the frame contracts, and the distance between the guides provided on each side decreases, the outer peripheral edge of the liquid crystal panel disposed in the area surrounded by the guides Is pressed toward. Then, the cell gap near the portion pressed by the guide changes, and the cell gap becomes non-uniform as a whole. If the cell gap is not uniform, display unevenness may occur on the screen. As described above, a display device using a frame formed of a resin material and positioning or holding a liquid crystal panel by a guide provided on the frame may cause display unevenness due to a decrease in temperature of the usage environment.

  As a configuration for solving such a problem, for example, a configuration in which the interval between guides provided in the frame is set in consideration of the amount of shrinkage accompanying the temperature decrease of the frame can be considered. In other words, even if the temperature of the usage environment decreases and the frame contracts, the guide interval is set large so that the guide does not strongly press the outer peripheral edge of the liquid crystal panel. However, when the distance between the guides is increased, the liquid crystal panel is not firmly held, and there is a possibility that rattling occurs. When the liquid crystal panel is wobbled, there is a high risk that the liquid crystal panel will be damaged by vibration or impact. Further, if the liquid crystal panel rattles and moves easily, a TAB (Tape Carrier Package) attached to the liquid crystal panel may be damaged or peeled off from the liquid crystal panel.

JP 2002-196212 A

  In view of the above situation, the problem to be solved by the present invention is that even when a member such as a frame contracts due to a decrease in temperature, display unevenness is generated by preventing a compressive force from being applied to a specific portion of the liquid crystal panel. It is an object of the present invention to provide a display device that can prevent the above-described problem.

  In order to solve the above-mentioned problems, the present invention provides a protruding guide for positioning and / or holding a display panel on a chassis formed of a material having a smaller thermal expansion coefficient than that of a frame. The frame is arranged on the front side of the chassis, and the display panel is arranged on the front side of the frame. Then, at least a part of the guide provided in the chassis protrudes to the front side of the frame, and the display panel is positioned and / or held by the protruded part.

  As the chassis made of a material having a smaller thermal expansion coefficient than the frame, for example, when the frame is made of a resin material, a configuration in which the chassis is formed of a metal material can be applied.

  In addition, it is preferable that the protruding guide provided on the chassis is integrally formed with the main body of the chassis.

  As a configuration in which the protruding guide provided on the chassis protrudes to the front side of the frame, for example, a configuration in which a through hole is formed in the frame and the guide protrudes to the front side of the frame through the through hole is preferable. Applicable.

  In the present invention, a side holder provided with a protruding guide for positioning and / or holding the display panel may be disposed on the front side of the chassis. That is, the display panel may be positioned and / or held by projecting at least a part of the guide provided in the side holder toward the front side of the frame. The guide is preferably formed integrally with the side holder.

  As a configuration in which the protruding guide provided on the side holder protrudes to the front side of the frame, for example, a configuration in which a through hole is formed in the frame and the guide protrudes to the front side of the frame through the through hole is preferable. Applicable to.

  According to the present invention, the display panel is positioned and / or held by the protruding guide provided on the chassis. Since the chassis is formed of a material having a smaller coefficient of thermal expansion than the frame, the amount of deformation (ie, the amount of shrinkage) of the chassis when the temperature of the environment in which the display device is used decreases is smaller than that of the frame. Therefore, since the dimensional change of the space | interval between guides can be made small, it can prevent that the outer periphery of a display panel is pressed by a guide. As a result, it is possible to prevent the occurrence of non-uniform cell gaps due to the application of local force to the display panel, and to prevent display unevenness from occurring on the screen.

  In addition, the same effect as described above can be achieved by using a side holder provided with a protruding guide for positioning and / or holding the display panel.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is an exploded perspective view showing a chassis 11a, a frame 12a, and a display panel 13 extracted from the display device according to the first embodiment of the present invention, and a part of the chassis 11a (parts A and B). FIG. 2 is an enlarged partial view (A portion enlarged view and B portion enlarged view). For convenience of explanation, the upper side in FIG. 1 is referred to as the front side of each of the chassis 11a, the frame 12a, and the display panel 13.

  The chassis 11a is a member made of a metal material, and is a member formed in a square plate or tray shape with a shallow bottom. Specifically, it has a bottom surface 111 formed in a substantially quadrangular flat plate shape and a side wall 112 formed so as to surround the bottom surface 111. Further, a step surface 113 substantially parallel to the bottom surface 111 is formed at a position one step lower than the tip of the side wall 112 (that is, the front surface side). The chassis 11a is formed of a material having a smaller coefficient of thermal expansion than the material of the frame 12a described later.

  Protruding guides 1141 and 1142 for positioning and / or holding the display panel 13 are provided at the tip of the side wall 112. As shown in FIG. 1, the guides 1141 and 1142 are provided at the four corners on the front side of the side wall 112 and near the center of each side. As shown in the enlarged view of the A part, the guides 1142 provided at the four corners are formed in a substantially L shape. Further, as shown in the enlarged view of part B, the guide 1141 provided in the vicinity of the center of each side is formed in a substantially linear shape. The heights of these guides 1141 and 1142 are set such that at least the tips of the guides 1141 and 1142 protrude to the front side of the frame 12a when the frame 12a is mounted on the front side of the chassis 11a. The guides 1141 and 1142 are formed by bending the side wall 112 to the front side by press working.

  The positions where the guides 1141 and 1142 are provided are merely examples, and the present invention is not limited to these positions. For example, the guides 1141 and 1142 may be provided only at the four corners of the side wall 112, or may be provided only near the center of each side of the side wall 112. In addition, a configuration in which a plurality of guides 1141 are provided at predetermined intervals on each side of the side wall 112 may be employed. Further, the method of forming the guides 1141 and 1142 is not limited to the above method. For example, a method of projecting a predetermined position of the side wall 112 to the front side by press working may be used. In addition, a method in which guides 1141 and 1142 made of members different from the chassis 11a are attached to the side wall 112 may be used.

  The point is that each guide 1141 and 1142 protrudes further from the front end of the side wall 112 toward the front surface side and can be disposed so as to fit the display panel 13 in a region surrounded by the guides 1141 and 1142. .

  As shown in each of the enlarged view of the A part and the enlarged view of the B part, the buffer material 115 is provided on the inner peripheral surface side of each of the guides 1141 and 1142. The buffer material 115 can be made of an elastically deformable material such as rubber.

  The frame 12a is a member made of a resin material, and is a member having an open substantially quadrilateral frame shape. For the frame 12a, a configuration in which the frame 12a is integrally molded with a resin material, a configuration in which components molded with a resin material are combined, or the like can be applied. Side walls 121 are provided on the outer peripheral side of each side of the frame 12a so as to rise toward the back side. For this reason, the cross-sectional shape of each side of the frame 12a has a substantially “L” shape. Further, a through hole 122 through which the guides 1141 and 1142 of the chassis 11a can be inserted is formed at a predetermined position of the frame 12a.

  As shown in FIG. 1, the display panel 13 includes a pair of substrates, specifically, for example, a TFT array substrate 131 and a color filter 132. The TFT array substrate 131 and the color filter 132 are arranged to face each other with a predetermined minute interval, and the minute gap between the TFT array substrate 131 and the color filter 132 is filled with liquid crystal. The display panel 13 can be a conventional transmissive liquid crystal panel. Therefore, detailed description of the configuration and operation of the display panel 13 is omitted.

  The holding structure of the display panel 13 in such a display device is as follows. FIG. 2 is a cross-sectional view schematically showing a holding structure of the display panel 13 by the chassis 11a and the frame 12a. The actual display device includes various predetermined members in addition to the display panel 13, the chassis 11a, and the frame 12a, but is omitted here.

  As shown in FIG. 2, a frame 12a is attached to the front side of the chassis 11a. When the frame 12a is mounted on the front surface side of the chassis 11a, the guides 1141 and 1142 provided on the side wall 112 of the chassis 11a protrude to the front surface side of the frame 12a through the through holes 122 formed in the frame 12a. And it arrange | positions so that the display panel 13 may be inserted by the area | region enclosed by each guide 1141,1142 which protrudes.

  According to such a configuration, the display panel 13 is positioned by the protruding guides 1141 and 1142 provided on the chassis 11a and is held so as not to move.

  When the temperature of the usage environment of the display device decreases, the size of each member decreases according to the temperature change and the thermal expansion coefficient of each member. As the dimensions of each side of the chassis 11a change, the distance between the guides 1141 and 1142 provided on the chassis 11a also decreases. By the way, since the chassis 11a is formed of a material having a smaller thermal expansion coefficient than the frame 12a, the amount of deformation of the chassis 11a accompanying the decrease in the temperature of the use environment is smaller than that of the frame 12a. Since each of the guides 1141 and 1142 is provided on the chassis 11a, the change in the distance between the guides is small as compared with the configuration in which the guide is provided on the frame 12a.

  For this reason, when the temperature of the usage environment of the display device decreases, the force with which the guides 1141 and 1142 press the display panel 13 can be reduced, or the guides 1141 and 1142 do not press the display panel 13. it can. Therefore, it is possible to prevent the cell gap from becoming uneven due to local force applied to a specific portion of the outer peripheral edge of the display panel 13 by the guides 1141 and 1142, and the occurrence of display unevenness due to the unevenness of the cell gap. Can be prevented or suppressed.

  Next, the overall configuration of the display device according to the first embodiment of the present invention will be described. FIG. 3 is an exploded perspective view schematically showing the configuration of the main part of the display device 1a according to the first embodiment of the present invention. For convenience of explanation, the upper part of FIG. 3 is referred to as “front side” of the display device 1a according to the first embodiment of the present invention and each member constituting the display device 1a, and the lower part is referred to as “back side”.

  A display device 1a according to the first embodiment of the present invention includes a chassis 11a, a reflection sheet 14, a light source 15, an optical sheet 16, a frame 12a, a display panel 13, a bezel 17, and a control circuit board 18. A control circuit board cover 181, a light source driving circuit board 19, and a light source driving circuit board cover 191.

  These members constituting the display device 1a according to the first embodiment of the present invention will be briefly described. The configurations of the chassis 11a, the frame 12a, and the display panel 13 are as described above.

  The reflection sheet 14 is a sheet-like or plate-like member having a surface property that diffusely reflects light emitted from the light source 15. The reflection sheet 14 is formed of, for example, a sheet-like or plate-like foamed PET (polyethylene terephthalate).

  Various conventionally known light sources can be applied to the light source 15. For example, various fluorescent tubes such as cold cathode tubes and hot cathode tubes, discharge tubes such as xenon tubes, light emitting elements such as LEDs, and the like can be applied. The display device 1a shown in FIG. 3 has a configuration in which a linear fluorescent tube is applied as the light source 15, but the present invention is not limited to the configuration shown in FIG.

  The optical sheets 16 refer to a plate-like member or a sheet-like member that adjusts the characteristics of light emitted from the light source 15, or a set of such members. For example, a diffusion sheet or a diffusion plate that diffuses light emitted from the light source 15 to make the surface direction luminance uniform, and collects light emitted from the light source 15 to improve the brightness of the screen of the display panel 13. There is a lens sheet for achieving the above, a polarized light reflecting sheet for passing only polarized light in a predetermined direction and reflecting polarized light in other directions.

  The optical sheets 16 are appropriately selected and arranged according to the type of the display device 1a. In general, a plurality of optical sheets 16 are arranged in an overlapping manner. For example, a configuration in which a polarizing plate is disposed on the rearmost side and a diffusion sheet, a polarizing reflection sheet, a lens sheet, and a diffusion sheet are disposed on the front side thereof can be applied.

  The bezel 17 is a member having a function of protecting the display panel 13 and the like. As shown in FIG. 3, the bezel 17 has a substantially quadrilateral frame shape. And the side wall which stands up on the back side is provided in the outer periphery of each side, For this reason, the cross-sectional shape of each side has a substantially "L" shape. Although not shown, dust prevention rubber is provided on the back side of the inner periphery of each side so that foreign matter such as dust does not enter between the bezel 17 and the display panel 13.

  The control circuit board 18 is a circuit board on which an electronic circuit and / or an electric circuit for generating a control signal for driving the display panel 13 is constructed based on an image signal input from the outside. The control circuit board cover 181 is a plate-like member that covers the control circuit board 18. The control circuit board cover 181 is made of, for example, a metal plate material.

  The light source driving circuit board 19 is a circuit board on which an electronic circuit and / or an electric circuit for driving the light source 15 is constructed. For example, when a fluorescent tube is applied as the light source 15, an inverter circuit for generating a pulse voltage is constructed on the light source driving circuit board 19. The light source drive circuit board cover 191 is a plate-like or shallow container member that covers the light source drive circuit board 19 and is formed of, for example, a metal plate.

  The assembly of the display device 1a including such a member is as follows.

  The reflection sheet 14 is disposed on the front side of the bottom surface 111 of the chassis 11a, and the light source 15 is disposed on the front side. Then, the optical sheets 16 are arranged on the step surface 113 of the side wall 112 of the chassis 11a. That is, the four sides of the optical sheets 16 are supported by the step surface 113 of the side wall 112 of the chassis 11a. Further, the frame 12a is mounted on the front side. When the frame 12a is mounted on the front side of the chassis 11a, guides 1141 and 1142 provided on the stepped surface 113 of the side wall 112 of the chassis 11a protrude through the through hole 122 formed in the frame 12a to the front side of the frame 12a.

  Then, the display panel 13 is disposed so as to be fitted into a region surrounded by the guides 1141 and 1142 protruding to the front side of the frame 12a. Thereby, as described above, the display panel 13 is positioned by the guides 1141 and 1142 and held so as not to move. A bezel 17 is attached to the front side.

  A light source driving circuit board 19 is disposed on the back side of the chassis 11a, and a harness drawn from each light source 15 and the light source driving circuit board 19 are connected. Then, a light source drive circuit board cover 191 is disposed so as to cover the light source drive circuit board 19. In addition, a control circuit board 18 is disposed on the back side of the chassis 11a, and the control circuit board 18 and a printed wiring board mounted on the display panel 13 are connected so as to be able to transmit and receive electrical signals. As this connection means, FFC, FPC, or the like can be applied. Further, a control circuit board cover 181 is attached so as to cover the control circuit board 18.

  Thereby, the display device 1a according to the first embodiment of the present invention is obtained. According to such a configuration, even if the temperature of the environment in which the display device 1a is used decreases and the dimensions of each member change, it is possible to prevent or suppress a force from being locally applied to a specific position of the display panel 13. Thus, it is possible to prevent or suppress the occurrence of display unevenness due to the nonuniformity of the cell gap. Therefore, the display device 1a can perform display with high quality.

  Next, a display device according to a second embodiment of the present invention will be described. 4 is an exploded perspective view showing the chassis 11b, the side holder 20a, the frame 12b, and the display panel 13 extracted from the display device according to the second embodiment of the present invention, and a part of the chassis 11b ( They are a partial enlarged view (A part enlarged view) which expanded and showed the A part), and a partial enlarged view (B part enlarged view) which expanded and showed a part (B part) of the side holder 20a. For convenience of explanation, the upper side in FIG. 4 is referred to as “front side” of the chassis 11b, the side holder 20a, the frame 12b, and the display panel 13, and the lower side is referred to as “back side”.

  The chassis 11b is a member made of a metal material, and is a member formed in a square dish or tray shape with a shallow bottom. Specifically, it has a bottom surface 111 formed in a substantially quadrangular flat plate shape, and a side wall 112 (see an enlarged view of part A) standing on the front side is formed on the long side of the bottom surface 111. A step surface 113 that is substantially parallel to the bottom surface is formed at the front end (that is, the front surface side) of each side wall 112. The chassis 11b is formed of a material having a smaller thermal expansion coefficient than a frame 12b described later.

  The side wall 112 is provided with a protruding guide 1143 for positioning and / or holding the display panel 13. As shown in FIG. 4, the guide 1143 is provided near both ends and near the center of each side wall 112. The structure and position of these guides 1143 are the same as the guide 1141 provided on the chassis 11a of the display device 1a according to the first embodiment. Therefore, the description is omitted.

  Then, as shown in the enlarged view of the A part, a buffer material 115 is provided on the inner peripheral surface side of each guide 1143. The buffer material 115 can be made of an elastically deformable material such as rubber.

  The side holder 20a is a member that functions as a spacer or the like that supports optical sheets. The side holder 20a is a substantially rod-like member, and is formed integrally or substantially integrally with, for example, a resin material. The front side of the side holder 20a is formed with a substantially planar portion (hereinafter, this substantially planar portion is referred to as “side holder upper surface 201”). Thus, a protruding guide 202 for positioning and / or holding the display panel 13 is provided.

  The guide 202 is formed integrally with the side holder 20a. The height of the guides 202 is such that when the side holder 20a is disposed on the bottom surface 111 of the chassis 11b and the frame 12b is mounted on the front surface side thereof, at least the tips of the guides 202 protrude to the front side of the frame 12b. Set to the height to be.

  The position where the guide 202 is provided is not particularly limited. For example, as shown in FIG. 4, the side holder 20a may be provided in the vicinity of both ends in the longitudinal direction and in the vicinity of the center, or may be provided only in the vicinity of both ends or in the vicinity of the center. In addition, a plurality of guides 202 may be provided at predetermined intervals along the longitudinal direction of the side holder 20a. Moreover, the shape of these guides 202 is not specifically limited. For example, it may be formed in a tongue-like shape as shown in FIG. Further, as shown in the enlarged view of part B, a buffer material 115 is provided on the inner peripheral surface side of each guide 202. The buffer material 115 can be made of an elastically deformable material such as rubber.

  Two side holders 20a having the same or substantially the same configuration are disposed on each short side of the chassis 11b.

  The frame 12b has substantially the same configuration as the frame 12a of the display device 1a according to the first embodiment. A through hole 123 into which a guide 1143 provided on the chassis 11b can be inserted is formed at a predetermined position on the long side of the frame 12b, and a guide provided on the upper surface 201 of the side holder 20a at a predetermined position on the short side. A through hole 124 through which 202 can be inserted is formed.

  A display panel having the same configuration as the display panel 13 applied to the display device 1a according to the first embodiment can be applied. Therefore, explanation is omitted.

  The holding structure of the display panel 13 in the display device according to the second embodiment of the present invention is as follows. FIG. 5 is a cross-sectional view schematically showing a holding structure of the display panel 13 by the chassis 11b and the frame 12b. 5A shows the cross-sectional structure of the long side of the chassis 11b and the frame 12b and the vicinity thereof, and FIG. 5B shows the cross-sectional structure of the short side of the chassis 11b and the side holder 20a. The actual display device includes various predetermined members in addition to the display panel 13, the chassis 11b, the side holder 20a, and the frame 12b, but is omitted here.

  As shown in FIG. 5B, a side holder 20a is disposed along the short side of the front surface of the bottom surface 111 of the chassis 11b. As shown in FIGS. 5A and 5B, a frame 12b is mounted on the front side. When the frame 12b is mounted on the front side of the chassis 11b and the side holder 20a, each guide 1143 provided on the side wall 112 of the chassis 11b and each guide 202 provided on the upper surface 201 of the side holder 20a are formed on the frame 12b. It protrudes to the front side of the frame 12b through the through holes 122 and 123 formed. And it arrange | positions so that the display panel 13 may be inserted by the area | region enclosed by each guide 1143,202 which protrudes.

  According to such a configuration, the display panel 13 is positioned by the guide 1143 provided on each side wall 112 of the chassis 11b and the guide 202 provided on the upper surface 201 of the side holder 20a, and is held so as not to move. The

  Since the chassis 11b is formed of a material having a smaller thermal expansion coefficient than that of the frame 12b, the same operational effects as the display device according to the first embodiment can be obtained. In addition, even if the side holder 20b is formed of a material having a larger thermal expansion coefficient than the chassis 11b, the effect is not affected.

  That is, when the distance between the side holder 20a arranged on one short side of the chassis 11b and the side holder 20a arranged on the other short side becomes short (in FIG. 5B, the left side holder 20a When the distance from the right side holder 20a is shortened), the short sides of the display panel 13 are pressed by the guide 202 provided on the upper surface 201 of each side holder 20a, and the display panel 13 is compressed in the long side direction. Will be added.

  However, the change in the distance between the side holder 20a disposed on one short side and the side holder 20a disposed on the other short side depends on the amount of deformation in the long side direction of the chassis 11b, and each side holder 20a. There is almost no influence of the amount of deformation. Since the chassis 11b is formed of a material having a smaller thermal expansion coefficient than that of the side holder 20a, the amount of change in the dimension in the long side direction accompanying a temperature change can be reduced.

  Therefore, the side holder 20a is formed of a material having a larger thermal expansion coefficient than that of the chassis 11b, and even if the side holder 20a is greatly deformed due to a temperature change, the effect of the present invention is hardly affected. Thus, even if it is the structure by which the side holder 20a which consists of material with a large thermal expansion coefficient is arrange | positioned at each short side of the chassis 11b, there can exist an effect similar to the display apparatus concerning 1st embodiment. .

  Next, the overall configuration of the display device according to the second embodiment of the present invention will be described. FIG. 6 is an exploded perspective view schematically showing the configuration of the main part of the display device 1b according to the second embodiment of the present invention. For convenience of explanation, the upper part of FIG. 6 is referred to as the “front side” of the display device 1b according to the second embodiment of the present invention and each member constituting the display device 1b, and the lower part is referred to as the “rear side”.

  The display device 1b according to the second embodiment of the present invention includes a chassis 11b, a reflection sheet 14, a light source 15, a side holder 20a, optical sheets 16, a frame 12b, a display panel 13, and a bezel 17. A control circuit board 18, a control circuit board cover 181, a light source driving circuit board 19, and a light source driving circuit board cover 191.

  The configurations of the chassis 11b, the side holder 20a, and the frame 12b are as described above. The reflective sheet 14, the light source 15, the optical sheet 16, the display panel 13, the bezel 17, the control circuit board 18, the control circuit board cover 181, the light source driving circuit board 19, and the light source driving circuit board cover 191 are the first embodiment. A display device having the same configuration as that of the display device 1a can be applied. Therefore, explanation is omitted.

  The assembly of the display device 1b according to the second embodiment is as follows.

  The reflection sheet 14 is arranged on the front side of the bottom surface 111 of the chassis 11b, and the light source 15 is arranged side by side on the front side. And the side holder 20a is arrange | positioned so that each edge part of the arrange | positioned light source 15 may be covered to each short side of the chassis 11b. Further, an optical sheet 16 is disposed on the front side. Specifically, the long side of the optical sheet 16 is disposed on the step surface 113 of each side wall 112 of the chassis 11b, and the short side is disposed on the upper surface 201 of the side holder 20a.

  Then, the frame 12b is mounted on the front side. When the frame 12b is arranged on the front side of the chassis 11b and the side holder 20a, a guide 1143 provided on each side wall 112 of the chassis 11b and a guide 202 provided on the upper surface 201 of the side holder 20a are respectively penetrated in the frame 12b. It projects to the front side of the frame 12b through the holes 122 and 123. Then, the display panel 13 is disposed so as to be fitted into a region surrounded by the guides 1143 and 202 protruding to the front side of the frame 12b. Accordingly, as described above, the display panel 13 is positioned by the guides 1143 and 202 and held so as not to move. A bezel 17 is attached to the front side.

  A light source drive circuit board 19 is disposed on the back side of the chassis 11b, and a harness drawn from each light source 15 and the light source drive circuit board 19 are connected. Then, a light source drive circuit board cover 191 is disposed so as to cover the light source drive circuit board 19. In addition, a control circuit board 18 is disposed on the back side of the chassis 11b, and the control circuit board 18 and a printed wiring board mounted on the display panel 13 are connected so as to be able to transmit and receive electrical signals. As this connection means, FFC, FPC, or the like can be applied. Further, a control circuit board cover 181 is attached so as to cover the control circuit board 18.

  Thereby, the display device 1b according to the second embodiment of the present invention is obtained. The display device 1b having such a configuration can achieve the same effects as the display device 1a according to the first embodiment.

  Next, a modified example of the present invention will be described.

  7 is an exploded perspective view showing the chassis 11c, the frame 12c, and the display panel 13 extracted from the display device according to the first modification of the present invention, and a part of the chassis 11c (part A and B). FIG. 4 is a partially enlarged view (part A enlarged view and part B enlarged view) in which a part is extracted. For convenience of explanation, the upper side in FIG. 7 is referred to as “front side” of the chassis 11c, the frame 12c, and the display panel 13, and the lower side is referred to as “back side”.

  The chassis 11c is a member made of a metal material, and is a member formed in a square dish or tray shape with a shallow bottom. Specifically, it has a bottom surface 111 formed in a substantially quadrangular flat plate shape and a side wall 112 formed so as to surround the bottom surface 111. Further, a step surface 113 substantially parallel to the bottom surface 111 is formed at the front end (that is, the front surface side) of the side wall. The chassis 11c is formed of a material having a smaller thermal expansion coefficient than a frame 12c described later.

  At the tip of the side wall 112, as shown in the enlarged view of the A part and the enlarged view of the B part, protruding engagement pieces 1145 and 1146 that engage with the through holes 125 and 126 formed in the frame 12 c are provided. . The engagement pieces 1145 and 1146 are provided, for example, at the four corners of the chassis 11c and near the center of each side. These engagement pieces 1145 and 1146 can be formed by a method in which the side wall 112 is bent to the front side by pressing. When the frame 12c is mounted on the front side of the chassis 11c, the engagement pieces 1145 and 1146 can be engaged with the through holes 125 and 126 formed in the frame 12c. The height is not particularly limited.

  The positions at which the engagement pieces 1145 and 1146 are provided are merely examples, and the present invention is not limited to these positions. For example, the engagement pieces 1145 and 1146 may be provided only at the four corners of the step surface 113 of the side wall 112, or may be provided only near the approximate center of the side wall 112 of each side. In addition, a configuration may be employed in which a plurality of engaging pieces 1145 and 1146 are provided at predetermined intervals on the side wall 112 of each side. Further, the method of forming the engagement pieces 1145 and 1146 is not limited to the above method. For example, a method of projecting a predetermined position of the side wall 112 to the front side by press working may be used. In addition, a method of attaching engaging pieces 1145 and 1146 made of a member different from the chassis 11c to the side wall 112 may be used.

  The frame 12c is a member made of a resin material, and is a member having a substantially quadrilateral frame shape. For the frame 12c, a configuration in which the frame 12c is integrally molded with a resin material, a configuration in which components molded with a resin material are combined, or the like can be applied. A side wall 121 is provided on the outer peripheral side of each side of the frame 12c. For this reason, the cross-sectional shape of each side of the frame 12c has a substantially “L” shape.

  On the inner peripheral side of the front side of the frame 12c, a step surface 1201 that is retracted to the back side is formed. And it can arrange | position so that the display panel 13 may be inserted in this level | step difference surface 1201. FIG. Further, on the outside of the step surface 1201, through holes 125 and 126 capable of engaging the engaging pieces 1145 and 1146 of the chassis 11c are formed.

  A display panel having the same configuration as the display panel applied to the display device 1a according to the first embodiment can be applied. Therefore, explanation is omitted.

  The holding structure of the display panel 13 in the display device according to the first modification is as follows. FIG. 8 is a cross-sectional view schematically showing a holding structure of the display panel 13 by the chassis 11c and the frame 12c. The actual display device includes various predetermined members in addition to the display panel 13, the chassis 11c, and the frame 12c, but is omitted here.

  As shown in FIG. 8, a frame 12c is mounted on the front side of the chassis 11c. And it arrange | positions so that the display panel 13 may be fitted by the level | step difference surface 1201 formed in the front side of the flame | frame 12c. The display panel 13 is positioned and held so as not to move by a vertical surface around the step surface 1201.

  When the frame 12c is mounted on the front side of the chassis 11c, the engagement pieces 1145 and 1146 provided on the side wall 112 of the chassis 11c engage with the through holes 125 and 126 formed in the frame 12c.

  When the temperature of the usage environment of the display device decreases, the size of each member decreases according to the temperature change and the thermal expansion coefficient of each member. And with the dimensional change of each side of the chassis 11c, the space | interval of the engagement pieces 1145 and 1146 provided in the chassis 11c also becomes small. Incidentally, since the chassis 11c is formed of a material having a smaller thermal expansion coefficient than that of the frame 12c, the amount of deformation of the chassis 11c accompanying the decrease in the temperature of the use environment is smaller than that of the frame 12c.

  And since the engagement pieces 1145 and 1146 provided in the chassis 11c engage with the respective through holes 125 and 126 formed in the frame 12c, the deformation of the frame 12c caused by the temperature drop by the engagement pieces 1145 and 1146 of the chassis 11c. Is blocked. For this reason, the deformation amount of the frame 12c can be reduced.

  Therefore, when the temperature of the environment in which the display device is used decreases, the vertical surface around the step surface 1201 of the frame 12c can reduce the force pressing the display panel 13, or the step surface 1201 of the frame 12c can be reduced. The surrounding vertical surface can be prevented from pressing the display panel 13. Therefore, it is possible to prevent the cell gap from becoming non-uniform due to the force applied to the outer peripheral edge of the display panel 13, and to prevent or suppress the occurrence of display unevenness due to the non-uniformity of the cell gap.

  Next, the overall configuration of the display device according to the first modification will be described. FIG. 9 is an exploded perspective view schematically showing a configuration of a main part of the display device 1c according to the first modification. For convenience of explanation, the upper part of FIG. 9 is referred to as the “front side” of the display device 1c according to the first modification and each member constituting the display device 1c, and the lower part is referred to as the “rear side”.

  The configurations of the chassis 11c and the frame 12c are as described above. The reflective sheet 14, the light source 15, the optical sheet 16, the display panel 13, the bezel 17, the control circuit board 18, the control circuit board cover 181, the light source driving circuit board 19, and the light source driving circuit board cover 191 are the first embodiment. A display device having the same configuration as that of the display device 1a can be applied. Therefore, explanation is omitted.

  The assembly of the display device 1c according to the first modification is as follows.

  The reflection sheet 14 is disposed on the front side of the bottom surface 111 of the chassis 11c, and the light source 15 is disposed on the front side. Then, the optical sheets 16 are arranged on the step surface 113 of the side wall 112 of the chassis 11c. That is, the four sides of the optical sheet 16 are supported on the step surface 113 of the side wall 112 of the chassis 11c. Further, the frame 12c is mounted on the front side. And it arrange | positions so that the display panel 13 may be inserted in the level | step difference surface 1201 of the flame | frame 12c. Thereby, as described above, the display panel 13 is positioned by the vertical surface around the step surface 1201 and is held so as not to move. When the frame 12c is mounted on the front side of the chassis 11c, the engagement pieces 1145 and 1146 provided on the side wall 112 of the chassis 11c engage with the through holes 125 and 126 formed in the frame 12c. A bezel 17 is attached to the front side.

  A light source drive circuit board 19 is disposed on the back side of the chassis 11c, and a harness drawn from each light source 15 is connected to the light source drive circuit board. Then, a light source drive circuit board cover 191 is disposed so as to cover the light source drive circuit board 19. In addition, a control circuit board 18 is disposed on the back side of the chassis 11c, and the control circuit board 18 and a printed wiring board mounted on the display panel 13 are connected so as to be able to transmit and receive electrical signals. As this connection means, FFC, FPC, or the like can be applied. Further, a control circuit board cover 181 is attached so as to cover the control circuit board 18.

  Thus, the display device 1c according to the first modification is obtained. According to such a configuration, even if the temperature of the usage environment of the display device 1c decreases and the frame 12c attempts to deform, the deformation is prevented or suppressed by the engagement pieces 1145 and 1146 of the chassis 11c. Therefore, it is possible to prevent or suppress the frame 12c from applying force to the display panel 13, and to prevent or suppress the occurrence of display unevenness due to the non-uniformity of the cell gap. Therefore, the display device 1c can perform high-quality display.

  Next, a display device according to a second modification will be described. FIG. 10 is an exploded perspective view showing the chassis 11d, the side holder 20b, the frame 12d, and the display panel 13 extracted from the display device according to the second modification, and a part of the chassis 11d (part A). ) Showing a partial enlarged view (A portion enlarged view) and a partial enlarged view (B portion enlarged view) showing a part (B portion) of the side holder 20b. For convenience of explanation, the upper side in FIG. 10 is referred to as “front side” of the chassis 11d, the side holder 20b, the frame 12d, and the display panel 13, and the lower side is referred to as “back side”.

  The chassis 11d is a member made of a metal material, and is a member formed in a square dish or tray shape with a shallow bottom. Specifically, it has a bottom surface 111 formed in a substantially quadrangular flat plate shape, and a side wall 112 standing on the front surface side is formed on each long side of the bottom surface 111. A surface substantially parallel to the bottom surface 111 (this surface is referred to as “side wall step surface 113”) is formed at the front end (that is, the front surface side) of each side wall 112. The chassis 11d is formed of a material having a smaller thermal expansion coefficient than a frame 12d described later.

  The stepped surface 113 of each side wall 112 is provided with a projecting engagement piece 1147 that engages with each through hole 127 formed in the frame 12d (see particularly the enlarged view of part A). The engaging pieces 1147 are provided near both ends and near the center of each side wall 112. The structure and position of these engagement pieces 1147 can be the same configuration and position as the engagement pieces provided on the chassis of the display device according to the first embodiment. Therefore, the description is omitted.

  The side holder 20b is a member that functions as a spacer or the like that supports optical sheets. The side holder 20b is a substantially rod-like member, and is formed integrally or substantially integrally with, for example, a resin material. On the front side of the side holder 20b, a substantially planar portion (hereinafter, this substantially planar portion is referred to as "side holder upper surface 201") is formed. As shown in the enlarged view of part B, the upper surface 201 is provided with protruding engagement pieces 203 that engage with the through holes 128 formed in the frame 12d.

  These engagement pieces 203 are formed integrally with the side holder 20b. The height of the engagement pieces 203 is such that at least the tips of the engagement pieces 203 are formed on the frame 12d in a state where the side holder 20b is disposed on the bottom surface 111 of the chassis 11d and the frame 12d is mounted on the front surface side thereof. The height is set such that it can be engaged with each through-hole 128.

  The position where these engagement pieces 203 are provided is not particularly limited. For example, as shown in FIG. 10, the side holder 20b may be provided in the vicinity of both ends in the longitudinal direction and in the vicinity of the center, or may be provided only in the vicinity of both ends or only in the vicinity of the center. In addition, a plurality of engagement pieces 203 may be provided at predetermined intervals along the longitudinal direction of the side holder 20b. Moreover, the shape of these engagement pieces 203 is not specifically limited. For example, as shown in FIG. 10, it may be formed in a tongue-like shape or a rod shape.

  Two side holders 20b having the same or substantially the same configuration are disposed on each short side of the chassis 11d.

  The frame 12d has substantially the same configuration as the frame 12a of the display device 1a according to the first embodiment. A through hole 127 capable of engaging with an engaging piece 1147 provided on the chassis 11d is formed at a predetermined position on the long side of the frame 12d, and on the upper surface 201 of the side holder 20b at a predetermined position on the short side. A through-hole 128 that can engage with the provided engagement piece 203 is formed.

  A display panel having the same configuration as the display panel applied to the display device 1a according to the first embodiment can be applied. Therefore, explanation is omitted.

  The display panel holding structure in the display device according to the second modification is as follows. FIG. 11 is a cross-sectional view schematically showing a holding structure of the display panel 13 by the chassis 11d and the frame 12d. FIG. 11A shows the cross-sectional structure of the long side of the chassis 11d and the frame 12d and the vicinity thereof, and FIG. 11B shows the cross-sectional structure of the short side of the chassis 11d and the side holder 20b. The actual display device includes various predetermined members in addition to the display panel 13, the chassis 11d, the side holder 20b, and the frame 12d, but is omitted here.

  As shown in FIG. 11B, a side holder 20b is disposed along the short side of the front surface of the bottom surface 111 of the chassis 11d. Then, as shown in FIGS. 11A and 11B, a frame 12d is mounted on the front side. And it arrange | positions so that the display panel 13 may be inserted in the level | step difference surface 1201 of the flame | frame 12d. According to such a configuration, the display panel 13 is positioned by the vertical surface around the step surface 1201 of the frame 12d and is held so as not to move.

  Further, when the frame 12d is mounted on the front side of the chassis 11d and the side holder 20b, the engagement pieces 1147 provided on the side wall 112 of the chassis 11d and the engagement pieces 203 provided on the upper surface 201 of the side holder 20b Engages with the through holes 127 and 128 formed in the frame 12d. The deformation of the frame 12d is prevented or suppressed by the engagement pieces 1147 provided on the side wall 112 of the chassis 11d and the engagement pieces 203 provided on the upper surface 201 of the side holder 20b.

  Since the chassis 11d is formed of a material having a smaller thermal expansion coefficient than that of the frame 12d, the same operational effects as those of the display device 1c according to the first modification can be obtained.

  In addition, even if the dimension of the side holder 20b changes with the temperature change, the dimensional change in the short side direction and the dimensional change in the long side direction of the frame 12d are not affected. Therefore, the side holder 20b is formed of a material having a larger thermal expansion coefficient than the chassis 11d, and even if the side holder 20b is deformed larger than the chassis 11d, the effect of the present invention is not affected. Thus, even if it is the structure by which the side holder 20b which consists of a material with a large thermal expansion coefficient is arrange | positioned at each short side of the chassis 11d, there exists an effect similar to the display apparatus 1c concerning a 1st modification. Can do.

  Next, the overall configuration of the display device according to the second modification will be described. FIG. 12 is an exploded perspective view schematically showing the configuration of the main part of the display device 1d according to the second modification. For convenience of explanation, the upper part of FIG. 12 is referred to as the “front side” of the display device 1d according to the second modification and each member constituting the display device 1d, and the lower part is referred to as the “rear side”.

  The display device 1d according to the second modification includes a chassis 11d, a reflection sheet 14, a light source 15, a side holder 20b, an optical sheet 16, a frame 12d, a display panel 13, a bezel 17, and a control. A circuit board 18, a control circuit board cover 181, a light source driving circuit board 19, and a light source driving circuit board cover 191 are provided.

  The configurations of the chassis 11d, the side holder 20b, and the frame 12d are as described above. In addition, the reflection sheet 14, the light source 15, the optical sheet 16, the display panel 13, the bezel 17, the control circuit board 18, the control circuit board cover 181, the light source driving circuit board 19, and the light source driving circuit board cover 191 The same configuration as that of the display device 1c according to the modification can be applied. Therefore, explanation is omitted.

  The assembly of the display device 1d according to the second modification is as follows.

  The reflection sheet 14 is arranged on the front side of the bottom surface 111 of the chassis 11d, and the light source 15 is arranged side by side on the front side. And the side holder 20b is arrange | positioned so that each edge part of the arrange | positioned light source 15 may be covered to each short side of the chassis 11d. Further, an optical sheet 16 is disposed on the front side. That is, the long side of the optical sheets 16 is supported by the step surface 113 of each side wall 112 of the chassis 11d, and the short side is supported by the upper surface 201 of the side holder 20b.

  Then, the frame 12d is mounted on the front side. When the frame 12d is mounted on the chassis 11d, the engagement pieces 1147 provided on the side wall 112 of the chassis 11d and the engagement pieces 203 provided on the upper surface 201 of the side holder 20b are formed in the through holes formed in the frame 12d. 127 and 128 are engaged. As a result, deformation of the frame 12d due to temperature change is prevented or suppressed. The display panel 13 is disposed on the front side of the mounted frame 12d. The display panel 13 is disposed so as to be fitted into a step surface 1201 provided on the front side of the frame 12d, is positioned by a vertical surface around the step surface 1201, and is held so as not to move.

  A light source driving circuit board 19 is disposed on the back side of the chassis 11d, and a harness drawn from each light source 15 and the light source driving circuit board 19 are connected. Then, a light source drive circuit board cover 191 is disposed so as to cover the light source drive circuit board 19. In addition, a control circuit board 18 is disposed on the rear side of the chassis 11d, and the control circuit board 18 and a printed wiring board mounted on the display panel 13 are connected so as to be able to transmit and receive electrical signals. As this connection means, FFC, FPC, or the like can be applied. Further, a control circuit board cover 181 is attached so as to cover the control circuit board 18.

  Thereby, the display device 1d according to the second modified example is obtained. The display device 1d having such a configuration can achieve the same effects as the display device 1c according to the first modification.

  As mentioned above, although various embodiment of this invention was described in detail, this invention is not limited to the said embodiment at all, A various change is possible in the range which does not deviate from the meaning of this invention.

The exploded perspective view which extracted and showed the display panel, the chassis, and the flame | frame from the display apparatus concerning 1st embodiment of this invention, and the partial expansion which extracted and showed a part of chassis (A part and B part) It is a figure (A part enlarged view and B part enlarged view). It is sectional drawing which showed typically the holding structure of the display panel in the display apparatus concerning 1st embodiment of this invention. It is the disassembled perspective view which showed typically the structure of the principal part of the display apparatus concerning 1st embodiment of this invention. The disassembled perspective view which extracted and showed the display panel, the chassis, the side holder, and the flame | frame from the display apparatus concerning 2nd embodiment of this invention, and the elements on larger scale which showed a part (A part) of the chassis (A part enlarged view) and the partial enlarged view (B part enlarged view) which showed a part (B part) of a side holder. It is sectional drawing which showed typically the holding structure of the display panel in the display apparatus concerning 2nd embodiment of this invention, (a) is the figure which showed the long side of the chassis, and the cross-sectional structure of the vicinity, (b) FIG. 3 is a view showing a cross-sectional structure of a short side of the chassis and its vicinity. It is the disassembled perspective view which showed typically the structure of the principal part of the display apparatus concerning 2nd embodiment of this invention. The disassembled perspective view which extracted and showed the display panel, the chassis, and the flame | frame from the display apparatus concerning the 1st modification of this invention, and the part which extracted and showed a part of chassis (A part and B part) It is an enlarged view (A part enlarged view and B part enlarged view). It is sectional drawing which showed typically the holding structure of the display panel in the display apparatus concerning the 1st modification of this invention. It is the disassembled perspective view which showed typically the structure of the principal part of the display apparatus concerning the 1st modification of this invention. The exploded perspective view which extracted and showed the display panel, the chassis, the side holder, and the flame | frame from the display apparatus concerning the 2nd modification of this invention, and the partial expansion which showed a part (A part) of the chassis It is the figure (A part enlarged view) and the partial enlarged view (B part enlarged view) which showed a part (B part) of a side holder. It is sectional drawing which showed typically the holding structure of the display panel in the display apparatus concerning the 2nd modification of this invention, (a) is the figure which showed the structure of the long side of a chassis, and its vicinity, (b) FIG. 4 is a view showing the structure of the short side of the chassis and the vicinity thereof. It is the disassembled perspective view which showed typically the structure of the principal part of the display apparatus concerning the 2nd modification of this invention. It is the disassembled perspective view which showed typically the prior art example of the structure of the principal part of a display apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Display apparatus 11a Chassis 111 Chassis bottom face 112 Chassis side wall 113 Chassis side wall top face 1141 Guide 1142 Guide 115 Cushioning material 12a Frame 1201 Frame step surface 121 Frame side wall 122 Frame through-hole (first 13 display panel 14 reflection Sheet 15 Light source 16 Optical sheet 17 Bezel 18 Control circuit board 181 Control circuit board cover 19 Light source drive circuit board 191 Light source drive circuit board cover

Claims (7)

  A display panel, a frame, and a chassis made of a material having a smaller thermal expansion coefficient than that of the frame and provided with a protruding guide for positioning and / or holding the display panel. A frame is disposed, and the display panel is disposed on the front side of the frame, and at least a part of the guide provided in the chassis projects to the front side of the frame to position and / or hold the display panel. A display device characterized by that.   The display device according to claim 1, wherein the chassis is made of a metal material, and the frame is made of a resin material.   The display device according to claim 1, wherein the guide is formed integrally with the chassis.   The display device according to claim 1, wherein a through hole is formed in the frame, and a guide provided in the chassis protrudes to a front side of the frame through the through hole.   A side holder provided with a protruding guide for positioning and / or holding the display panel is further provided, and the side holder is disposed on the front side of the chassis, and at least a part of the guide provided on the side holder includes 5. The display device according to claim 1, wherein the display panel is positioned and / or held by projecting to a front side of the frame.   The display device according to claim 5, wherein the guide is formed integrally with the side holder.   The display device according to claim 5, wherein a through hole is formed in the frame, and a guide provided in the side holder protrudes to the front side of the frame through the through hole.

Images