JP2017044823A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device having a structure capable of preventing a display panel from being subjected a stress while improving heat radiation performance of a circuit board (drain substrate) connected to a display panel.SOLUTION: An insulation sheet 4 is disposed between a drain substrate 3a and a substrate holder 12. The insulation sheet 4 has a plurality of bent parts 4b disposed on the end face of the drain substrate 3a and has a structure to hold the drain substrate 3a. Since the drain substrate is held by the insulation sheet as a sheet material, the drain substrate can be fixed while preventing unevenness in display on the display panel and the heat radiation from the drain substrate can be made efficiently.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a display device.

  Monitors (image display devices) are used for applications such as televisions, computer terminals, advertising media, medical equipment, and image production. The basic structure of these devices is composed of an image display unit incorporating a backlight unit and a display panel, an electric circuit unit, a structure unit for supporting them, and an exterior unit. The image display unit includes a display panel. The display panel is a liquid crystal panel, an organic EL (electroluminescence) panel, or the like, in which a display element such as a liquid crystal element or an organic light emitting element is provided between two glass substrates on which a thin film device is formed. . In the structure of the image display unit including the display panel, the front and rear of the holding space in which the display panel is accommodated are covered with structural parts, and the image viewing side of the display panel is covered with a metal bezel. An image display unit in which the display panel is a liquid crystal panel includes a liquid crystal panel, a backlight unit that illuminates the liquid crystal panel, and optical sheets that collect light from the backlight unit. These are arranged in the order of optical sheets and a backlight unit on the back of the liquid crystal panel. For the purpose of maintaining a certain space between the optical sheets and the liquid crystal panel and for the purpose of protecting the liquid crystal panel itself, a resin panel holder is disposed so as to cover the periphery of the display area of the liquid crystal panel from the back. In addition, a substantially square-shaped bezel is disposed on the image viewing side of the liquid crystal panel so as to surround the display area of the liquid crystal panel. An elastic body such as a cushion is disposed between the liquid crystal panel and the bezel. With this structure, the liquid crystal panel is held between the panel holder and the bezel.

  The liquid crystal panel needs to drive a large number of pixels in order to display an image. For this purpose, the drain substrate is connected via an FPC (Flexible Printed Circuit) connected to one side or a plurality of sides of the liquid crystal panel. A liquid crystal driving semiconductor package called a source driver is mounted in the middle of the FPC. The drain substrate is arranged for transmitting an image signal to the liquid crystal panel. The drain substrate is connected to the liquid crystal panel by a flexible FPC and is disposed around the backlight unit. A shape for fixing the drain substrate may be formed on the side surface of the backlight case in which the light source of the backlight unit is housed or on the panel holder holding the liquid crystal panel. In addition, since the heat generation of the drain substrate and the source driver increases when the display panel has a higher definition, the heat dissipation of these is also important.

  FIG. 13 is a cross-sectional view of a main part of the image display device described in Patent Document 1. Patent Document 1 describes the fixing of the drain substrate 103 a disposed at the tip of the FPC 103 d connected to the liquid crystal panel 103. In order to make a ground (GND) connection of the drain substrate 103 a, the drain substrate 103 a is fixed to the center chassis 114 with a substrate fixing screw 118. A panel holder 105 is disposed below the drain substrate 103a.

JP 2014-197224 A

In the liquid crystal panel, display unevenness may appear when stress is applied to the display surface, and the member that holds the liquid crystal panel preferably has a configuration that holds the liquid crystal panel so that stress is not applied as much as possible. In Patent Document 1, when a force that pulls the liquid crystal panel 103 is applied by the FPC 103d connected to the liquid crystal panel 103, display unevenness may appear around the portion where the FPC 103d is connected. The liquid crystal panel 103 may be warped due to temperature and humidity. At that time, if the drain substrate 103 a is firmly fixed, the FPC 103 d is pulled by the warp of the liquid crystal panel 103, and stress is applied to the liquid crystal panel 103. Then, display unevenness may appear around the connection portion of the FPC 103d. Therefore, it is desirable to fix the drain substrate semi-fixed with some spatial margin rather than firmly fixing. A panel holder 105 is disposed between the drain substrate 103a and the center chassis 114. The panel holder 105 is often molded from resin. Considering the heat dissipation of the drain substrate 103a, there is a panel holder on the substrate installation surface, and the panel holder is made of resin, so the heat conductivity is not high, so the heat dissipation efficiency is not good.

  The present invention has been made in view of this problem, and can improve heat dissipation of a circuit board (drain substrate) connected to the display panel and can suppress a stress from being applied to the display panel. An object of the present invention is to provide a display device having the following.

The present invention includes a display panel,
A circuit board connected to the display panel by a connection member;
A panel holder for holding the display panel;
A substrate holder for holding the circuit board;
A sheet member disposed between the substrate holder and the circuit board;
A restricting portion that is provided on the sheet member and restricts the movement of the circuit board;
Have
The restricting portion restricts the movement of the circuit board by contacting the end of the circuit board, and the end is an end opposite to the side connected to the connecting member. It is a display device characterized by being.

  ADVANTAGE OF THE INVENTION According to this invention, while improving the heat dissipation of the circuit board (drain substrate) connected to a display panel, the display apparatus which has a structure which can suppress that a stress is applied to a display panel is provided.

1 is a front view illustrating an appearance of an image display device according to a first embodiment. 1 is a side view showing an appearance of an image display device according to Embodiment 1. FIG. 1 is an exploded perspective view of an image display device according to Embodiment 1. FIG. 1 is a cross-sectional view of an image display device according to Embodiment 1. FIG. 1 is a perspective view of a panel module according to Embodiment 1. FIG. FIG. 3 is a detail view of a main part of the panel module according to the first embodiment. It is explanatory drawing at the time of assembling the insulating sheet which concerns on Example 1. FIG. 3 is a development view of an insulating sheet according to Example 1. FIG. 3 is a detailed view of an insulating sheet according to Example 1. FIG. 6 is an exploded perspective view of an image display apparatus according to Embodiment 2. FIG. 6 is a cross-sectional view of an image display device according to Embodiment 2. FIG. FIG. 6 is a cross-sectional view of a main part of an image display device according to a second embodiment. FIG. 6 is a cross-sectional view of main parts of an image display device according to a third embodiment. It is sectional drawing of the image display apparatus of a prior art.

Example 1
Examples of the present invention are described in detail below.
FIG. 1A is a front view illustrating an appearance of the image display apparatus according to the first embodiment.
FIG. 1B is a side view illustrating an appearance of the image display apparatus according to the first embodiment.
The image display device 1 includes a bezel 2 and a rear cover 17 on the exterior. In addition, a liquid crystal panel 3 which is a display panel for displaying an image is arranged inside the exterior. There is a display area 3a for displaying an image on the image viewing side of the liquid crystal panel 3, and a substantially square-shaped opening 2a is opened on the front side of the bezel 2, so that the display area 2a is exposed. Has been.

  A rear cover 17 is provided on the back side of the image display device 1. The rear cover 17 forms a substantially box shape by matching the periphery with the bezel 2. The bezel 2 is often made by metal such as aluminum or iron, or resin molding. In many cases, the rear cover is formed by sheet metal pressing or resin molding.

FIG. 2 is an exploded perspective view of the image display apparatus according to the first embodiment.
As described above, the bezel 2 and the rear cover 17 are disposed as an exterior, and each electric substrate, liquid crystal panel, and the like are disposed therein. A panel module 1M is disposed on the back surface of the bezel 2. The configuration of the panel module 1M includes a liquid crystal panel 3 that displays an image and a backlight unit 1B that illuminates light for transmitting the liquid crystal panel 3 from the back side of the liquid crystal panel 3 on the back side. A light source substrate 9 on which a light source is mounted, a heat sink 10 that dissipates heat from the light source substrate 9, and a backlight case 11 that houses the light source substrate 9 and the heat sink 10 are provided. In recent years, the light source substrate 9 often uses an LED (Light Emitting Diode) as a light source. In addition to LEDs, CCFLs (Cold Cathode Fluorescent Lamps) may be used, so the light source is not particularly limited.

  A reflection sheet 8 is disposed in the light emission direction of the light source substrate 9. The reflection sheet 8 is for efficiently reflecting the diffused light from the light source substrate 9 to the liquid crystal panel 3. Optical sheets 7 are disposed on the liquid crystal panel 3 side of the reflection sheet 8. The optical sheets 7 diffuse and condense the light from the light source substrate 9 so that the light source on the light source substrate 9 does not become a point light source, and improve the luminance from the front by condensing it. Is for. A panel holder 5 is disposed on the optical sheet 7 on the liquid crystal panel 3 side. The panel holder 5 holds the liquid crystal panel 3 by holding the optical sheet 7 and supporting the liquid crystal panel 3 from the back side. A substrate holder 12 is disposed on the upper side surface of the backlight case 11. On the back surface of the backlight case 11, an LED control board 13 for driving the light source board 9 and an image control board 3e for driving the liquid crystal panel are arranged.

  On the back side of the panel module 1M, a circuit board 15 that receives image signals from the outside and performs image processing, and a power supply board 16 that supplies power to each electric circuit, board, panel module 1M, and the like are arranged. . In order to support the circuit board 15 and the power supply board 16, a chassis 14 is attached to the back surface of the panel module 1M. The rear cover 17 covers the back side where the substrates are.

FIG. 3 is a cross-sectional view of the image display apparatus according to the first embodiment.
The liquid crystal panel 3 is sandwiched between a cushion disposed along the edge of the opening 2 a of the bezel 2 and a cushion 5 a disposed on the panel holder 5. The liquid crystal panel 3 may cause display unevenness when stress is applied. Since the liquid crystal panel 3 may be warped due to temperature and humidity, display unevenness may occur at a location where surrounding components abut when the liquid crystal panel 3 warps. Therefore, when holding the liquid crystal panel 3, it is desirable to hold it with a flexible cushion or the like as described above.

FIG. 4 is a perspective view of the panel module according to the first embodiment.
The liquid crystal panel 3 is placed on the upper surface of the backlight unit 1B. A plurality of FPCs 3 d (flexible printed circuits) are attached to one of the long sides of the liquid crystal panel 3. Drain boards 3a and 3b for sending image signals to the liquid crystal panel 3 are connected to the FPC 3d. Since the FPC 3 d has flexibility, the drain substrates 3 a and 3 b can be arranged on the side surface of the backlight case 11. A connector 3c is mounted on the drain boards 3a and 3b, and is connected to the image control board 3e in FIG. 2 by an FPC (not shown).

FIG. 5 is a detailed view of a main part of the panel module according to the first embodiment.
Here, the holding of the drain substrate will be described in detail. A substrate holder 12 is fixed to the upper side surface of the backlight case 11. The substrate holder 12 is made of metal such as sheet metal. The substrate holder 12 is installed to hold a drain substrate 3a which is a circuit substrate connected to the display panel by a connecting member. Since the substrate holder 12 is made of metal, an insulating sheet 4 as a sheet member is disposed between the substrate holder 12 and the drain substrate 3a for electrical insulation from the drain substrate 3a. The insulating sheet 4 and the substrate holder are disposed on the side opposite to the surface on which the circuit elements of the drain substrate 3a are mounted. It is assumed that the insulating sheet 4 and the drain substrate 3a have substantially the same size.

  The end surface of the drain substrate 3a is supported by the bent portion 12b of the substrate holder 12 so that the drain substrate 3a does not hang more than necessary. The insulating sheet 4 is provided with a protruding portion 4a, and is placed on the contact portion 12a which is a positioning portion provided on a plane portion substantially parallel to the drain substrate 3a of the substrate holder 12, whereby the position of the insulating sheet 4 is determined. Suppress deviation. The insulating sheet 4 is provided with a bent portion 4b which is a restricting portion that restricts the movement of the drain substrate 3a. The bent portion 4b regulates the movement of the drain substrate 3a by contacting the end of the drain substrate 3a. The end of the drain substrate 3a that contacts the bent portion 4b is the end opposite to the side to which the FPC 3d that is the connection member is connected. The movement of the drain substrate 3a in the direction away from the liquid crystal panel 3 is restricted by the bent portion 4b. The bent portion 4 b is formed by bending the end portion of the insulating sheet 4 on the main mounting surface side on which the circuit element of the drain substrate 3 a is mounted, and prevents the drain substrate 3 a from falling off the substrate holder 12.

FIG. 6 is an explanatory diagram when assembling the insulating sheet according to the first embodiment.
The insulating sheet 4 is provided with a main flat surface portion 4f and protruding portions 4a at both ends thereof, and an adhesive portion 4d is provided on the back surface of the main flat surface portion 4f. The adhesive portion 4d is a double-sided tape or an adhesive, and is thereby fixed to the substrate holder 12. When affixing the insulating sheet 4, the insulating sheet 4 can be affixed without positional displacement by abutting the protruding part 4 a against the abutting part 12 a of the substrate holder 12.

FIG. 7 is a development view of the insulating sheet according to the first embodiment.
FIG. 8 is a detailed view of the insulating sheet according to the first embodiment.
The insulating sheet 4 has a substantially planar shape before being assembled into the housing. The insulating sheet 4 is formed by punching a sheet material of PET (polyethylene terephthalate) or PC (polycarbonate), which is a material that can be electrically insulated, with a mold. A plurality of bent portions 4 b are provided at a part of the lower end of the insulating sheet 4. Two rows of cut lines 4b1 and 4b2 are formed at substantially the center of the bent portion 4b. By bending the cut lines 4b1 and 4b2 of the bent portion 4b in FIG. 7 as folding lines, the bent portion 4b can be formed as shown in FIG. The bent portion 4b includes a folded portion 4c that supports end portions of the drain substrates 3a and 3b, and a support portion 4d that presses a component mounting surface of the drain substrate. That is, the bent portion 4b is formed by bending at least a part of the end portion of the insulating sheet 4 to the side opposite to the side where the substrate holder 12 is present, and the cross section perpendicular to the main plane (perpendicular to the substrate holder) is U-shaped. Has a shape. The movement of the drain substrate is restricted by the end of the drain substrate coming into contact with the inside of the U-shape. By adopting such a configuration, it is possible to hold the drain substrates 3a and 3b. Further, the bent portion 4b holds the drain substrates 3a and 3b with a certain amount of space without firmly fixing the drain substrates 3a and 3b. Therefore, even if the position fluctuates slightly due to the warp of the liquid crystal panel 3 or the like, stress due to tension is not easily applied to the liquid crystal panel 3, and display unevenness due to the stress is suppressed.

In the prior art, a panel holder is disposed for holding the drain substrate, and the heat dissipation of the drain substrate is performed from the surface in contact with the panel holder. Resin molding is generally used for the panel holder, and since it is thick, heat dissipation is not very efficient. In Example 1, since the insulating sheet is a thin sheet-like member, it is possible to efficiently dissipate heat to the substrate holder that holds the drain substrate.
Further, since the drain substrate is semi-fixed without being firmly fixed by screws or the like, stable holding can be performed while suppressing occurrence of display unevenness.

(Example 2)
Example 2 is an example in which the holding of the insulating sheet has a different configuration.
FIG. 9 is an exploded perspective view of the image display apparatus according to the second embodiment.
The backlight unit constituting the panel module 21M and the circuit board, power supply board, and rear cover on the back thereof are the same as those in the first embodiment. The difference from the first embodiment is that a heat sink 6 is provided on the upper side surface of the liquid crystal panel 3. The heat sink 6 is provided on the opposite side of the insulating sheet and the substrate holder with the drain substrate interposed therebetween, and engages with the substrate holder 212 that holds the drain substrate using screws or the like.

FIG. 10 is a cross-sectional view of the image display apparatus according to the second embodiment.
A drain substrate 3a is connected to the liquid crystal panel 3 via the FPC 3d on the upper surface direction of the liquid crystal panel 3 and on the upper surface of the backlight case 11. A heat sink 6 is disposed between the drain substrate 3a and the bezel 2 located on the opposite surface.

FIG. 11 is a cross-sectional view of main parts of the image display device according to the second embodiment. The heat sink 6 will be described with reference to FIG.
An FPC 3 d is connected to the end of the liquid crystal panel 3. A drain substrate 3a is connected to the FPC 3d. A source driver 3f is mounted substantially at the center of the FPC 3d. The source driver 3f is a circuit element for controlling an image signal to the liquid crystal panel 3, and this element generates heat. A heat sink 6 is provided to dissipate and cool the source driver 3f. The heat sink 6 forms an abutting portion 6b. When the abutting portion 6b contacts the source driver 3f, the source driver 3f is radiated and cooled.

The insulating sheet 4 is disposed on the substrate holder 212 side of the drain substrate 3a. As in the first embodiment, the insulating sheet 4 is bent at the lower end of the drain substrate 3a to form a support portion 4c and a support portion 4d. The support portion 4d is a sheet-like member of the insulating sheet 4 made of PET or PC, so even if it is bent and molded, it tends to return to its original position by springback, and the space between the drain substrate 3a may increase. is there. A bent portion 6a is provided at the tip of the heat sink 6 at a position facing the support portion 4d. By disposing the bent portion 6a, the support portion 4d of the insulating sheet 4 to be returned to the original can be pressed in the direction of the substrate holder. At this time, by pressing the support portion 4d so that a gap with the drain substrate 3a is secured to some extent, the drain substrate 3a can be in a semi-fixed state in which the drain substrate 3a is not fixed firmly.
According to Example 2, it is possible to hold the drain substrate more stably by pressing the supporting portion of the insulating sheet with the bent portion of the heat sink.

(Example 3)
Example 3 is an example in which the form of the insulating sheet is changed to another configuration.
FIG. 12 is a cross-sectional view of main parts of the image display device according to the third embodiment.
As in the second embodiment, the FPC 3 d is connected to the end of the liquid crystal panel 3. A drain substrate 3a is connected to the FPC 3d. An insulating sheet 34 is disposed between the drain substrate 3a and the substrate holder 212.

The insulating sheet 34 has a main plane portion 34f on the side opposite to the component mounting surface of the drain substrate 3a, and is bent so as to cover the end surface of the drain substrate 3a. A bent portion 34d is formed on the insulating sheet 34 by bending the bent portion 34c. The drain substrate 3a is held by a bent portion 34d. That is, the bent portion 34d is formed by bending at least a part of the end portion of the insulating sheet 34 to the side opposite to the side where the substrate holder 212 is present, and the cross section perpendicular to the main plane (perpendicular to the substrate holder) is V-shaped. Have The movement of the drain substrate is regulated by the end of the drain substrate contacting the inside of the V shape.
The bent portion 34d is restrained from rising when the bent portion 6a of the heat sink 6 is pressed to the side where the substrate holder is located. The section of the insulating sheet 34 where the drain substrate 3a is pressed is folded back into a substantially V shape.

As described above, the insulating sheet is disposed between the drain substrate and the substrate holder, and is folded back so as to cover the end surface portion of the drain substrate of the insulating sheet, so that the drain substrate is not fixed firmly and the display unevenness is less affected. In addition, the stability can be improved and maintained.
In addition, since the insulating sheet is thinner than the resin-molded panel holder, the drain substrate can be efficiently radiated.

  In the above embodiment, an example in which a liquid crystal panel is used as the display panel has been described. However, an organic EL panel, a MEMS (Micro Electro Mechanical Systems) shutter type display panel, or the like can be used without any particular limitation. . The description of each embodiment is an example for explaining the present invention, and may be appropriately modified or combined without departing from the spirit of the invention. In the above embodiment, the substrate holder for holding the drain substrate is provided on the upper side surface of the backlight case. However, the other side surface of the backlight case (the side surface that is left and right in use or the lower side surface) ).

1: Image display device, 3: Panel, 3a, 3b: Drain substrate, 4: Insulating sheet, 5: Panel holder, 12: Substrate holder

Claims (16)

A display panel;
A circuit board connected to the display panel by a connection member;
A panel holder for holding the display panel;
A substrate holder for holding the circuit board;
A sheet member disposed between the substrate holder and the circuit board;
A restricting portion that is provided on the sheet member and restricts the movement of the circuit board;
Have
The restricting portion restricts the movement of the circuit board by contacting the end of the circuit board, and the end is an end opposite to the side connected to the connecting member. A display device characterized by the above.   The display device according to claim 1, wherein the restricting portion restricts movement of the circuit board in a direction away from the display panel.   The restricting portion is formed by bending at least a part of the end portion of the sheet member to the side opposite to the side where the substrate holder is present, and has a U-shaped cross section, and is formed inside the U-shaped shape. The display device according to claim 1, wherein the movement of the circuit board is regulated by contact of an end portion of the circuit board.   The restricting portion is formed by bending at least a part of an end portion of the sheet member to a side opposite to the side where the substrate holder is present, and has a V-shaped cross section, and the circuit is disposed inside the V-shaped. The display device according to claim 1, wherein movement of the circuit board is regulated by contact of an end portion of the board.   5. The display device according to claim 1, wherein the substrate holder includes a flat portion that is substantially parallel to the circuit board, and a positioning portion that is provided on the flat portion and positions the sheet member. A backlight for illuminating the display panel from the back side;
A backlight case for storing the backlight;
Have
The display device according to claim 1, wherein the substrate holder is disposed on a side surface of the backlight case.   The display device according to claim 6, wherein the substrate holder is disposed on an upper side surface of the backlight case.   The display device according to claim 1, wherein the substrate holder is made of metal.   The display device according to claim 1, wherein the sheet member is made of a material that insulates the substrate holder from the circuit board.   The display device according to claim 1, wherein the connection member is a flexible printed circuit.   The display device according to claim 1, wherein the circuit board is a drain board that sends an image signal to the display panel.   The display device according to claim 1, wherein the sheet member and the substrate holder are arranged on a side opposite to a surface on which the circuit element of the circuit board is mounted. Having a heat sink provided on the opposite side of the sheet member and the substrate holder across the circuit board;
5. The display device according to claim 3, wherein the heat sink has a bent portion that presses an end portion of the bent sheet member in the restricting portion toward the substrate holder.   The display device according to claim 13, wherein the heat sink is provided for cooling a circuit element provided in the connection member.   The display device according to claim 14, wherein the circuit element is a source driver.   The display device according to claim 1, wherein a size of the sheet member is substantially equal to a size of the circuit board.

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