JP2014157203A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that display unevenness is caused by increase of luminance only in a part where stress is added since a display panel 20 has a burr in a lower end, and the burr is caught by a supporting part generating stress locally.SOLUTION: An image display device has a support elastic body in a supporting part of a panel holder which supports weight of a display panel installed upright. By covering a burr in a lower end of the display panel and suppressing stress concentration, display unevenness is suppressed.

Description

  The present invention relates to an image display device, and more particularly to a technique effective when applied to an image display device having a structure for improving display unevenness such as a liquid crystal display panel.

  A display panel such as liquid crystal or organic EL (electroluminescence) is provided with a display element such as a liquid crystal or an organic light emitting element between two glass substrates on which a thin film device is formed.

  An image display device including a display panel is configured such that a metal case in which the display panel is stored or bonded is disposed on the opposite side of the display surface, and the display surface side is covered with a metal frame. An image display device in which the display panel is a liquid crystal display panel includes a liquid crystal display panel, a backlight unit that illuminates the liquid crystal display panel, and optical sheets that collect light from the backlight unit. Usually, the liquid crystal display panel is arranged on the back surface in the order of optical sheets and a backlight unit. Usually, in order to maintain a certain space from the optical sheets and to hold the liquid crystal display panel itself, a resin panel holder is disposed so as to cover the periphery and the back surface. Further, a metal frame is disposed on the front surface, and is sandwiched between the panel holder and the frame via an elastic body such as a cushion.

  If the manufacturing method of a display panel is demonstrated, the glass substrate which comprises a display panel will be obtained by cut | disconnecting a large mother glass substrate. Since cutting is performed by scribing and breaking using a diamond cutter, burrs are generated on the end surface of the glass substrate. A display device such as a liquid crystal display panel or an organic EL is composed of a glass substrate, and such a phenomenon can occur.

  When the image display device is erected, the lower end of the display panel is in contact with the panel holder. At this time, due to the weight of the display panel and the influence of burrs, the lower end of the display panel may be caught by the panel holder, and the display panel cannot be returned to the original position and may be slightly deformed. In particular, the stress generated by directly pushing the display panel or applying a large vibration to the end portion being caught by the holding member cannot be released unless the catch is released. This can cause display unevenness.

  When the display panel receives stress, display unevenness occurs at a location where the stress is locally applied.

  When static pressure or impact is directly applied to the display area of the display panel, stress is often applied locally to the entire screen. In particular, when the display panel is a liquid crystal display panel, misalignment of liquid crystal occurs locally.

  For this reason, incident light is transmitted locally only at a position where stress is applied, and is blocked at other positions. Therefore, black display is performed on the entire screen, but brightness is partially increased, resulting in display unevenness.

  In order to avoid this, a structure for temporarily reducing the stress applied to the display panel is proposed (Patent Document 1).

JP 2010-204357 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide an image display device that reduces the concentrated stress at a portion that supports the weight of the display panel and suppresses the occurrence of display unevenness.

  The image display device of the present invention supports a standing display panel, a panel holder positioned around the display panel and on the back surface of the display surface, and the weight of the display panel disposed at the panel holder at the lower end. It has a support part, A support elastic body is arrange | positioned between the said support part and the lower end of the said display panel, It is characterized by the above-mentioned.

  The present invention is an image display device that holds a display panel, and has an elastic body in a support portion of the display panel.

  According to the present invention, by providing an elastic body in the support portion of the display panel, the concentrated stress at a portion that supports the weight of the display panel is relieved and the occurrence of display unevenness is suppressed.

1 is an exploded perspective view of an image display device according to an embodiment of the present invention. It is a perspective view which shows the support structure of the display panel which concerns on embodiment of this invention. It is sectional drawing in AA of FIG. 2 of the image display apparatus which concerns on embodiment of this invention. It is a front view which shows the support structure of the image display apparatus which concerns on embodiment of this invention. It is a cross-sectional detail drawing which shows the support part of the display panel which concerns on embodiment of this invention. It is a perspective view which shows the support structure of the display panel which concerns on the 2nd Embodiment of this invention. It is sectional drawing in BB of FIG. 6 of the image display apparatus which concerns on the 2nd Embodiment of this invention. It is CC sectional drawing of FIG. 6 explaining the support state of the display panel which concerns on the 2nd Embodiment of this invention. It is a front view of the image display apparatus which concerns on the 3rd Embodiment of this invention. It is a perspective view which shows the support structure of the display panel which concerns on the 3rd Embodiment of this invention. It shows the display unevenness of the image display device. It is principal part sectional drawing of the display panel of the location where display nonuniformity arises.

Example 1
The first embodiment according to the present invention will be described below.

  FIG. 1 is an exploded perspective view of an image display apparatus according to an embodiment of a tracking eye. In this embodiment, a case where a liquid crystal display panel is used as a display panel will be described as an example.

  The image display device 1 includes a frame 10, a display panel 20, a panel holder 30, an optical sheet 40, a reflection sheet 50, a substrate 60, and a case 70. The frame 10 is often made of metal and is formed by pressing or machining, but may have a resin molded configuration. The panel holder 30 is preferably a resin-molded one, but may be formed of a metal material, and holds and accommodates the display panel 20 so as to maintain a certain space from the optical sheet 40.

  The optical sheet 40 diffuses light from the backlight unit 80. The reflection sheet 50 reflects light from the light source. A light source 61 such as an LED (Light Emitting Diode) or a CCFL (Cold Cathode Fluorescent Lamp) is mounted on the substrate 60. Further, examples of the backlight system include a direct type and an edge light type, but the configuration of the present invention is suitable for any system. The case 70 houses the optical sheet 40, the reflection sheet 50, and the substrate 60. The panel holder 30, the optical sheet 40, the reflection sheet 50, the substrate 60, and the case 70 constitute a backlight unit 80, and the display unit 20 is illuminated by the backlight unit 80.

  FIG. 2 is a perspective view showing a display panel support structure according to the embodiment of the present invention. 3 is a cross-sectional view taken along the line AA of FIG. 2 of the image display apparatus according to the embodiment of the present invention.

  FIG. 2 shows a state where the display panel 20 is erected in the backlight 80. A display panel 20 is disposed in the front recess of the panel holder 30, and a display control board 20 p for sending video signals and an FPC 20 f for connecting them are disposed on the top of the display panel 20. A support portion 30a integrated with the panel holder 30 is provided below the panel holder 30, and a support elastic body 31 is provided thereon. The display panel 20 is installed on the upper part of the support elastic body 31 and supports the weight of the display panel 20.

  Referring to FIG. 3, the display panel 20 is sandwiched between the first cushion 11 and the second cushion 12, and the front surface direction is held by the frame 10 via the first cushion 11. On the other hand, the lower end of the display panel 20 is supported by a support elastic body 31.

  FIG. 4 is a front view showing a support structure of the image display apparatus according to the embodiment of the present invention.

  The display panel 20 is composed of a first glass substrate 20a on the display surface side and a second glass substrate 20b on the backlight side, and their lower end portions are composed of an end portion 20e and a sealing portion 20d. The sealing part 20d is for injecting liquid crystal between the first glass substrate 20a and the second glass substrate 20b. The sealing portion 20d does not vary in the outer dimensions of the display panel 20 and does not have high strength. Therefore, if the weight of the display panel 20 is supported at this portion, there is a possibility that the display area may be varied or weakened against vibration and impact. Therefore, it is preferable that the support elastic body 31 is disposed not at the sealing portion 20d but at a portion corresponding to the end portion 20e.

  FIG. 5 is a detailed cross-sectional view showing the support portion of the display panel according to the embodiment of the present invention.

  A burr 20c generated at the time of manufacturing the display panel is present at a joint portion of the first glass substrate 20a and the second glass substrate 20b of the display panel 20. The support elastic body 31 includes a base material portion 31a and an adhesive portion 31b, and is fixed to the support portion 30a with the adhesive portion 31b. The burr 20c can bite into the base material portion 31a. That is, since the base material part 31a is produced | generated with the elastic body, the unevenness | corrugation of the burr | flash 20c can be absorbed with the softness | flexibility. Conventionally, when the height t1 of the burr 20c is high only in a part, local stress is generated in the part and display unevenness occurs. However, as described above, the burr 20c is absorbed, so that the occurrence of display unevenness is suppressed. it can.

  Further, when vibration, impact, or external force is applied to the image display device, the display panel 20 tries to move in the direction D. When the burr 20c directly contacts the support portion 30a as in the conventional case, the burr 20c is caught, but the support elastic body 31 can return to its original position due to its flexibility. That is, every time the display panel 20 changes its position, the stress applied to the display panel 20 changes and the display unevenness changes, but in the present invention, the display unevenness change can also be suppressed.

  The height t1 of the burr 20c is usually about 0.1 mm. Therefore, if the thickness of the base material portion 31a is 0.1 mm or less, there is a possibility that the base material portion 31a may be penetrated, and it is considered difficult to obtain the effect. Therefore, the thickness of the base material portion 31a is desirably 0.1 mm or more.

  Moreover, since the material of the base material part 31a has a sharp shape of the burr 20c, if the foam is a urethane foam, the deterioration tends to proceed. In this embodiment, a silicone rubber material was set. In this case, in view of the influence of heat generation of the image display device, it is relatively heat resistant and is suitable as a material for the supporting elastic body.

(Example 2)
Hereinafter, a second embodiment according to the present invention will be described.

  FIG. 6 is a perspective view showing a display panel support structure according to the second embodiment of the present invention. FIG. 7 is a cross-sectional view taken along the line BB of FIG. 6 of the image display apparatus according to the second embodiment of the present invention.

  6 shows a state in which the erected panel 20 is disposed in the backlight 80, as in FIG. The display panel 20 is positioned on the support portion 30 a of the panel holder 30 and supports its own weight with a support elastic body 32. FIG. 7 is a detailed view in the vicinity of the support portion of the display panel 20 in the cross section taken along line BB in FIG. Unlike the first embodiment, the support elastic body 32 has a three-layer structure. The support elastic body 32 includes three layers of a base material portion 32a, an adhesive portion 32b, and a sliding portion 32c.

  In the first embodiment, the bonding portion of the support elastic body is fixed by bonding to the support portion 30a of the panel holder 30, but in this embodiment, the sliding portion 32c slides with the support portion 30a. Yes. As in Example 1, the burr 20c of the first glass substrate 20a and the second glass substrate 20b of the display panel 20 bites into the base material portion 32a, and when the display panel 20 moves in the direction D1, the supporting elastic body 32 is also linked to the direction of D2. When vibration or impact is transmitted through the display panel, the configuration as in Example 1 can absorb minute displacement due to the flexibility of the base material. However, the display panel 20 including the liquid crystal display panel has polarizing plates attached to the surface of the first glass substrate and the back surface of the second glass substrate 20b. This polarizing plate is hygroscopic and expands and contracts due to the humidity around the display panel.

  As a result, the center of the display surface of the display panel 20 warps forward or warps to the backlight side. The amount of warpage is 0. It is several mm to several mm. When the display panel is warped, in the conventional panel holder, a burr of the display panel is caught at the support portion, and stress is applied to the display panel at that portion, thereby causing display unevenness.

  FIG. 8 is a cross-sectional view taken along the line CC of FIG. 6 for explaining the support state of the display panel according to the second embodiment of the present invention of FIG.

  As described above, FIG. 6 is a diagram illustrating a state in which the display panel 20 is warped due to a change in ambient humidity. At this time, the display panel 20 is warped to the position of the dotted line represented by 20w in a state where the display panel 20 is placed at high humidity. Since the lower end of the display panel 20 bites into the support elastic body 32, when the display panel 20 is warped, the support elastic body 32 slides with respect to the support portion 30a (not shown in FIG. 8) of the panel holder 30. To do. The support elastic body 32 can move to a dotted line represented by 32w. That is, even if the display panel is warped due to the surrounding environment, the display panel is not stressed by the catch of the support portion, and display unevenness can be suppressed.

  In this embodiment, the outer peripheral portion of the display panel is warped outside the display surface when the humidity is high. However, depending on the configuration of the display panel, the display panel may warp in the opposite direction.

(Example 3)
The third embodiment according to the present invention will be described below.

  FIG. 9 is a front view of an image display apparatus according to the third embodiment of the present invention. FIG. 10 is a perspective view showing a display panel support structure according to the third embodiment of the present invention.

  In FIG. 9A, the image display apparatus 1 is installed with the Y direction as the upper side, that is, the −Y direction as the gravity direction. As a method of using the image display device 1, FIG. 9A shows a case where the image display device 1 is used as a landscape. When used in still image editing or the like, the image display device may be used in the vertical direction. FIG. 9B shows a usage method in the case described above, which is used as a portrait. At this time, the gravity direction is the X direction.

  Referring to FIG. 10, when used as a landscape, in order to support its own weight in the −Y direction, the support elastic body described in the first embodiment is installed on the upper portion of the support portion 30 a as the support elastic body 31 h. . When used in a portrait, the weight of the display panel 20 is supported by the support portion 30b of the panel holder 30, so the support elastic body 31v is installed on the left side of the support portion 30b. The structure represented by the cross section EE and the cross section DD is the same as that of FIG. Further, the same configuration as in the second embodiment may be adopted.

  According to the application in which the image display device is used, display unevenness in various installation environments can be suppressed by appropriately arranging the supporting elastic body at a place where the weight of the display panel is applied.

  FIG. 11 is a diagram illustrating display unevenness of the image display device.

  In the image display apparatus 1, the display panel 20 is made of metal and covered with a frame-like frame 10. At this time, the display panel 20 is in a state where the full screen is displayed in black, and a display unevenness M is shown in the lower part of the display panel 20. The display unevenness M is a region having a partially high luminance when the display panel 20 is displayed in black on the entire screen. Since the brightness is partially high, the image appears white and display quality deteriorates.

  12 is a cross-sectional view taken along line FF in FIG.

  The display panel 20 includes a first glass substrate 20a on the display surface side and a second glass substrate 20b on the back surface side. Both sides are sandwiched between the first cushion 11 and the second cushion 12. Further, the weight of the display panel 20 is supported by a resin panel holder 30 at the lower part thereof. When the vibration or static pressure of the image display device 1 is applied, the display panel 20 is moved in the direction of arrow D, and is moved to the position L in FIG. Then, the burr 20c protrudes from the lower portion of the display panel 20, and is caught by the panel holder 30 and does not return to the original position. At this time, a load F <b> 1 is applied to the display panel 20 from the first cushion 11. At this time, the display panel 20 is locally stressed, and display unevenness occurs at this location.

  As for the liquid crystal display panel, there is a normally white display mode in which the transmittance of incident light is maximized and white display is performed in a state where no voltage is applied. Alternatively, there is a liquid crystal display device having a display form called normally black which performs black display with minimum transmittance. Since the liquid crystal orientation is not controlled by voltage application and the entire screen is displayed with the same luminance, the luminance unevenness is remarkably generated.

1 Video display device 10 frames
DESCRIPTION OF SYMBOLS 20 Liquid crystal display panel 20a Liquid crystal display panel end surface 20b Liquid crystal display panel back surface 30 Panel holder 30a Support part 30b Elastic body 31/32 Support elastic body 40 Optical sheet 50 Reflective sheet 60 Substrate 60a Light source 70 Case 80 Backlight unit

Claims (10)

A standing display panel, a panel holder positioned around the display panel and on the back surface of the display surface, and a support portion disposed on the panel holder for supporting the weight of the display panel at a lower end;
An image display device, wherein a support elastic body is disposed between the support portion and a lower end of the display panel.   The image display according to claim 1, wherein the elastic support body includes a base portion that is an elastic body and an adhesive portion having an adhesive layer, and the adhesive portion is engaged with the support portion. apparatus.   The image display device according to claim 1, wherein the base material portion is mainly made of silicone rubber.   The image display device according to claim 1, wherein the base material portion has a thickness of 0.1 mm or more.   The said support elastic body consists of the base material part which is an elastic body, the adhesion part and adhesive part which have an adhesive layer, and the said slide part slides mutually with the said support part. The image display device described.   The image display device according to claim 5, wherein the base material portion is mainly made of silicone rubber.   The image display device according to claim 5, wherein the base material portion has a thickness of 0.1 mm or more.   6. The display panel according to claim 1, wherein the display panel has a square shape and has two installation methods: an installation method that receives its own weight on a horizontal side and an installation method that receives its own weight on a vertical side. Image display device.   The image display device according to claim 1, wherein the support elastic body is disposed on at least a horizontal side or a vertical side of the display panel.   The image display device according to claim 1, wherein the display panel is a liquid crystal display panel or an organic EL display panel.