JP2019211731A - Display device - Google Patents

Abstract

To provide a display device that can suppress impacts on a display image due to penetration of dust.SOLUTION: A display device of the present invention comprises: a backlight unit; a frame-like panel holder that is arranged on a front side of the backlight unit; a rectangle display panel 11 that is arranged on a front side of the panel holder; and two cushion members 40v arranged along a shorter-side direction of the display panel 11 arranged between the panel holder and the display panel 11 and two cushion members 40h arranged along a longer-side direction thereof. A length of each of the cushion members 40v is longer than an interval in the longer-side direction of the two cushion members 40h, and a length of each of the cushion members 40h is longer than an interval in the shorter-side direction of the two cushion members 40v. A rim part of the cushion member 40v is arranged bending along a lateral surface of the cushion member 40h.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a display device including a backlight and a display panel.

  There is a display device including a backlight unit that emits light, a display panel that transmits light emitted from the backlight unit and displays an image, and a panel holder provided between the backlight and the display panel. In such a display device, a buffer member (cushion) is provided between the panel holder and the display panel to support the display panel and to prevent a large stress from being applied to the display panel.

  On the other hand, in such a display device, dust (such as dust) may enter the space between the backlight unit and the display panel from the outside. If dust enters the space between the backlight unit and the display panel, some of the light emitted from the backlight unit to the display panel may be blocked, causing image effects such as lowering the brightness of the displayed image. There is.

  In the display device of Patent Document 1, an extended portion obtained by extending both ends of a long-side rubber cushion (elastic member) on a long-side mold frame that supports a panel has a short-side side on a short-side mold frame. The rubber cushion and the rubber cushion are arranged to face each other so as to intersect in a substantially T shape.

JP 2008-191607 A

  However, in the above-described display device disclosed in Patent Document 1, the distance between the butted cushions may increase due to the dimensional tolerance of the cushion on the short side, the displacement of the attachment position, thermal deformation, or the like. When the distance between the butted cushions is increased, there is a concern that dust may enter through a gap generated between the cushions.

  When dust enters between the display panel and the backlight unit, an image influence such as a decrease in luminance of the displayed image may occur.

  In view of the above-described problems, an object of the present invention is to provide a display device that can suppress an influence on a display image due to intrusion of dust.

  The display device according to the present invention includes a backlight unit, a frame-like panel holder disposed on the front side of the backlight unit, a rectangular display panel disposed on the front side of the panel holder, and the panel holder Between the two first elastic members disposed along the first direction among the four sides of the display panel disposed between the panel holder and the display panel. Two second elastic members arranged along a second direction different from the first direction, and the length of each first elastic member is the first direction of the two second elastic members. The length of each second elastic member is longer than the distance in the second direction of the two first elastic members, and the end of the first elastic member is the second elastic member. Bend along the side of the And butterflies.

  According to the present invention, it is possible to suppress the occurrence of a gap between the buffer members that support the display panel. Therefore, it is possible to suppress the influence on the display image due to the intrusion of dust.

It is a perspective view which shows the structure of a display apparatus. It is a front view which shows a panel holder, a cushion member, and arrangement | positioning. It is a schematic diagram which shows arrangement | positioning with the panel holder and cushion member in the corner | angular of a panel holder. It is the front view which permeate | transmitted the flame | frame and display panel of the display apparatus. It is sectional drawing of the corner | angular part of a display apparatus. It is the schematic diagram which looked at the cross section between the display panel and panel holder of a display apparatus from the front. It is a schematic diagram of the corner | angular part of the panel holder of a display apparatus. It is a schematic diagram of the corner | angular part of the panel holder of the display apparatus which concerns on a present Example. It is a figure which shows the penetration | invasion path | route of the dust of a display apparatus. It is a schematic diagram which shows arrangement | positioning of the corner | angular part of the cushion member in a comparative example. It is sectional drawing which shows the penetration | invasion path | route of the dust in a comparative example.

<Example 1>
Embodiment 1 of the present invention will be described below. FIG. 1 is a perspective view showing the configuration of the display device 1.

  The display device 1 includes a frame 10, a display panel 11, a panel holder 30, a backlight unit 20, a control board 12, and a cover 13. Further, a cushion member 41 is provided between the frame 10 and the display panel 11. A cushion member 40 is provided between the panel holder 30 and the display panel 11.

  The frame 10 is a support member provided on the front side of the display panel 11 and formed in a frame shape so that the display area of the display panel 11 is exposed. The frame is formed of a metal material such as a sheet metal.

  The display panel 11 is a transmissive display panel that controls the light transmittance based on image data and displays an image by transmitting light emitted from the backlight unit 20. The display panel 11 is assumed to be a liquid crystal panel using a liquid crystal element as a transmissive element. The display panel 11 is a rectangular panel, the horizontal direction when the display device 1 is used corresponds to the longitudinal direction of the four sides of the display panel 11, and the vertical direction when the display device 1 is used is the short side of the four sides of the display panel 11. Corresponds to the hand direction. The correspondence relationship between the horizontal / vertical direction and the longitudinal / short direction of the display panel 11 during use is not limited to the above-described relationship. The display panel 11 includes a display area that displays an image by transmitting light emitted from the backlight unit 20.

  A cushion member 41 is provided between the frame 10 and the display panel 11. The cushion member 41 is provided in the peripheral area of the display area of the display panel 11. The display area is assumed to be a rectangular area. Therefore, the peripheral region has a frame shape with a rectangular opening. The cushion member 41 includes two cushion members 41 h corresponding to the longitudinal direction of the display panel 11 and two cushion members 41 v corresponding to the lateral direction of the display panel 11 in the peripheral region.

  The backlight unit 20 is a lighting device for irradiating the display panel 11 with light. Details of the backlight unit 20 will be described later.

  The control board 12 is a circuit board for executing control to display an image on the display device 1 by controlling the transmittance of the display panel 11 and the light emission luminance of the backlight unit 20.

  The cover 13 is a housing member that houses the back surface of the backlight unit 20 and the control board 12. The cover 13 is connected so as to cover the side surface of the frame 10, the display panel 11, and the backlight unit 20, and forms the exterior of the display device 1.

  The backlight unit 20 includes a light source substrate 21, an optical sheet 22, a reflection sheet 23, and a backlight case 24. The backlight unit 20 is a direct type backlight provided with a light source on the back surface of the display panel 11. The backlight unit 20 may be an edge light type backlight in which a light guide plate is provided on the back surface of the display panel and a light source is disposed on a side surface of the light guide plate.

  The light source substrate 21 is a substrate on which a light source that emits light is mounted. Assume that the light source is an LED. In addition, you may use other light sources, such as a cold cathode tube, as a light source.

  The optical sheet 22 is a diffusion sheet for diffusing the light output from the light source and irradiating the display panel 11. The optical sheet 22 is made of a plurality of resin sheets such as PET and PC having the characteristics of diffusing and condensing light, and has a function of controlling the light characteristics of the backlight unit 20 that illuminates the display panel 11.

  The reflection sheet 23 is a resin sheet such as PET having high reflection characteristics and diffusion characteristics. The reflection sheet 23 is provided on the front side of the light source substrate 21 and has an opening so that the light source is exposed.

  The backlight case 24 is a storage member (case) that stores the light source substrate 21 and the reflection sheet 23. The backlight case 24 is formed by bending a sheet metal such as an aluminum alloy having good thermal conductivity into a box shape. The backlight case 24 has a function of radiating heat generated in the light source substrate 21 to the back side of the backlight unit 20.

  The panel holder 30 is a frame-shaped support member that supports the display panel 11 from the back side and instructs the optical sheet 22 from the front side. The panel holder 30 is disposed on the front side of the backlight unit 20. The panel holder 30 may be included in the backlight unit 20.

  The panel holder 30 is a frame-shaped support member in which two long holder members 30h and two short holder members 30v are combined. Light output from the optical sheet 22 through the central opening of the panel holder 30 irradiates the back surface of the display panel 11. Each holder member of the panel holder 30 is a resin molded product.

  The optical sheet 22 is sandwiched and fixed by the panel holder 30 and the backlight case 24 from the front side and the back side. The display panel 11 is sandwiched and fixed between the frame 10 and the panel holder 30.

  A cushion member 40 is provided between the panel holder 30 of the backlight unit 20 and the display panel 11.

  When the display panel 11 is deformed by heat or external force, the display panel 11 and the backlight unit 20 (optical sheet 22) are spaced apart from each other so that the display panel 11 does not contact the optical sheet 22. Arranged to provide. Moreover, the space | interval provided between the display panel 11 and the backlight unit 20 (optical sheet 22) spreads light appropriately until the light output from the optical sheet 22 is irradiated to the display panel 11. Produce an effect. The panel holder 30 and the cushion member 40 are arranged for the purpose described above.

  FIG. 2 is a front view showing the arrangement of the panel holder 30 and the cushion member 40. FIG. 3 is a schematic diagram showing the arrangement of the panel holder 30 and the cushion member 40 at the corners of the panel holder 30.

  The panel holder 30 is a frame-shaped support member in which two long holder members 30h and two short holder members 30v are combined. The cushion member 40 includes two cushion members 40h having a rectangular cross section corresponding to the long holder member 30h, and two cushion members 40v corresponding to the short holder member 30h.

  In other words, the cushion member 40 h is a cushioning member having a rectangular cross section disposed between the display panel 11 and the panel holder 30 along the longitudinal direction of the display panel 11. The cushion member 40v is an elastic member having a rectangular cross section disposed between the display panel 11 and the panel holder 30 along the short direction of the display panel 11.

  The cushion member 40 is made of a foam of EPDM (ethylene propylene rubber) or urethane having a low repulsive force in order to prevent display unevenness due to excessive force applied to the display panel 11, and is bonded to the panel holder 30 on one side. Has a tape. At least a part of the cushion member 40 is fixed to the corresponding holder member.

  The panel holder 30 is formed by assembling each holder member to which the corresponding cushion member is bonded.

  The length of the cushion member 40v is longer than the interval between the two cushion members 40h attached to the panel holder 30.

  As shown in FIG. 3, the end portion of the cushion member 40 v is bent when the panel holder 30 is assembled. The side surface of the end portion of the cushion member 40v presses against the inner side surface of the rectangular cross section of the cushion member 40h. The end of the cushion member 40v is pressed at the corner of the panel holder 30 so as to be parallel to the end of the cushion member 40h. Here, the inner side indicates the display area side of the display device 1.

  Here, the end portion of the cushion member 40v has a non-adhesive portion 40a that is not fixed to the holder member. That is, the cushion member 40v has an adhesive portion that adheres to the holder member 30v on the center side, and a non-adhesive portion 40a that does not adhere to the holder member on the end side. When the end portion of the cushion member 40v is pressed against the cushion member 40h, the non-bonding portion 40a is deformed, so that the cushion member 40v is deformed more smoothly, and the adhesion between the cushion member 40v and the cushion member 40h is improved. In addition, the non-adhesion part 40a may be provided with a slidable sheet, and the mobility may be enhanced when the sheet is pressed and arranged.

  The vertical cushion member 40v is pressed against the lateral cushion member 40h, but the lateral cushion 40h may be pressed against the vertical cushion 40v.

  With the configuration as described above, the cushion member 40 provided between the display panel 11 and the backlight unit 20 is arranged with redundancy so that the cushion member 40 is in close contact with each other even if the attachment position of the cushion member 40 is shifted. Is done.

  Next, a description will be given of a comparative example in which the intrusion of dust in the display device and the configuration of the cushion member 40 of the present embodiment are not taken.

  FIG. 9 is a diagram illustrating a dust intrusion path of the display device 1001. 9A is a front view of the display device 1001, FIG. 9B is a side view of the display device 1001, and FIG. 9C is a rear view of the display device 1001.

  Since dust 100 is light, dust 100 rises and falls by its own weight. The dropped dust 100 is deposited on the lower side of the frame 10 and the display panel 1011. Most of the accumulated dust 100 is released to the outside of the display device 1001 by, for example, a fan 1150 provided on the back side of the cover 1013 or an air flow by natural convection generated by heat generated in the display device.

  On the other hand, part of the dust 100 may try to enter between the display panel 1011 and the backlight unit 1020.

  In the display device 1001 of the comparative example, the cushion member 1040h disposed on the panel holder 1030h in the longitudinal direction is longer than the intersection with the cushion member 1040v disposed on the panel holder 1030v, as in the above-described embodiment. . And in a corner | angular part, the cushion member 1040h and the cushion member 1040v are arrange | positioned at substantially T shape.

  FIG. 10 is a schematic diagram showing the arrangement of the corners of the cushion member 1040 in the comparative example. The display device 1001 of the comparative example is formed so that the length of the cushion member 1040v in the short direction is the same as the interval between the two cushion members 1040h in the longitudinal direction, and is arranged on the panel holder 1030.

  FIG. 10A shows a case where the attachment position of the cushion member 1040h in the short direction is the design position. FIG. 10B shows a case where the attachment position of the cushion member 1040h in the short direction is shifted upward in the vertical direction. As shown in FIG. 10B, in the cushion member 1040v of the comparative example, a gap may be generated at the corner portion due to a shift in the attaching position.

  FIG. 11 is a cross-sectional view showing the dust intrusion path of the cross section BB at the lower right front of FIG. A part of the dust 100 passes through the gap shown in FIG. 10B and enters between the display panel 1011 and the backlight unit 1020, and the dust 100 appears on the front surface of the backlight unit 1020 and the back surface of the display panel 1011. May adhere. If the dust 100 adheres, the light of the backlight unit 1020 is obstructed and appears as a black spot on the display panel 1011, and the image quality of the display image is deteriorated.

  Next, the dustproof effect of the display device 1 of the present embodiment will be described. FIG. 4 is a front view of a corner portion of the display device 1. FIG. 5 is a cross-sectional view of a corner portion of the display device 1. FIG. 6 is a schematic view of a cross section between the display panel 11 and the panel holder 30 of the display device 1 as viewed from the front. FIG. 6A shows a case where the attachment position of the cushion member 40v is arranged at the design position. FIG. 6B shows a case where the attachment position of the cushion member 40v is shifted in the vertical direction.

  FIG. 4 shows a front view through the frame 10 and the display panel 11 of the display device 1. As shown in FIG. 4, a cushion member 41 is provided on the back surface of the frame 10. It is assumed that a gap X is generated at the corner between the cushion member 41h extending in the longitudinal direction and the cushion member 41v extending in the short direction. When the dust 100 enters the display device 1 from the opening-shaped end portion of the frame 10 that faces the display area of the display panel 11, the dust 100 enters the back surface of the display panel 11 through the gap X.

  As shown in FIG. 5, the dust 100 that has entered from the gap X reaches the periphery of the cushion member 40 of the panel holder 30. However, as shown in FIG. 6, the cushion member 40 provided between the display panel 11 and the panel holder 30 does not have a gap at the corner portion because the cushion 40v is pressed against the cushion member 40h. . Therefore, it is possible to prevent the dust 100 from entering the backlight unit 20 from between the display panel 11 and the panel holder 30. Further, as shown in FIG. 6B, even if the attachment position of the cushion member 40v is shifted, the end of the cushion member 40v is pressed against the side of the rectangular cross section of the cushion member 40h. Dust 100 does not enter.

  Therefore, it is possible to suppress the influence on the display image caused by the dust 100 entering between the display panel 11 and the backlight unit 20.

<Example 2>
The second embodiment of the present invention will be described below with reference to the drawings.

  The display device of this embodiment will be described with reference to FIG. FIG. 7 is a schematic diagram of a corner portion of the panel holder 30 of the display device 1 according to the present embodiment.

  The outline of the present embodiment is the same as that of the first embodiment, and different portions will be described. The display device 1 is structured to be accommodated by the panel holder 30 from the back side of the display panel 11. The panel holder 30 is provided with a cushion member 40 to hold the display panel 11.

  The panel holder 30 forms a frame shape by combining two horizontal holder members 30h and two vertical holder members 30v. The cushion 40 of the panel holder 30 forms a frame shape by combining two lateral cushion members 40h and two longitudinal cushion members 40v each having a rectangular cross section.

  The length of the vertical cushion member 40v is longer than the interval between the two lateral cushion members 40h attached to the holder member 30h. The vertical cushion member 40v includes slits 40s at both ends. When the panel holder 30 is assembled by combining the holder members, the slits 40s at both ends of the longitudinal cushion member 40v are widened, and the longitudinal cushion member 40v is pushed at two locations on the long side of the lateral cushion member 40h. Hit it. Accordingly, since the pressing area of the vertical cushion member 40v and the horizontal cushion member 40h is doubled at the corner of the panel holder 30, the dustproof performance is improved.

  Therefore, it is possible to suppress the influence on the display image caused by the dust 100 entering between the display panel 11 and the backlight unit 20.

<Example 3>
The third embodiment of the present invention will be described below with reference to the drawings.

  The display device of this embodiment will be described with reference to FIG. FIG. 8 is a schematic diagram of a corner portion of the panel holder of the display device according to the present embodiment.

  The outline of the present embodiment is the same as that of the first and second embodiments, and different portions will be described.

  The panel holder 30 according to the third embodiment includes a rib (rib member) 30 </ b> R for fixing the cushion member 40.

  The interval Z between the ribs 30R is narrower than the thickness Yv of the cushion member 40v pressed against the cushion member 40h at the corner of the panel holder 30 and the thickness Yh of the cushion member 40h. The rib 30R is provided at a height that does not contact the display panel 11.

  The cushion member 40v and the cushion member 40h pressed against the cushion member 40h at the corner portion of the panel holder 30 are sandwiched and fixed by the rib 30R. Therefore, the cushion member 40v and the cushion member 40h pressed against the cushion member 40h at the corner portion of the panel holder 30 are compressed by the rib 30R.

  With the above configuration, the display panel 11 and the backlight unit 20 are protected from dust by the cushion 40 of the panel holder 30.

  For this reason, the corners of the cushion member 40 of the panel holder 30 can be more reliably pressed against the cushion member 40v in the vertical direction and the cushion member 40h in the lateral direction, and the cushion member 40 is aligned along the rib 30R. Workability is improved by being able to paste.

  Therefore, it is possible to suppress the influence on the display image caused by the dust 100 entering between the display panel 11 and the backlight unit 20.

DESCRIPTION OF SYMBOLS 1 Display apparatus 10 Frame 11 Liquid crystal panel 20 Backlight unit 21 Light source board 22 Optical sheet 23 Reflective sheet 24 Backlight case 30 Panel holder 40 Cushion member

Claims (6)

A backlight unit;
A frame-shaped panel holder disposed on the front side of the backlight unit;
A rectangular display panel disposed on the front side of the panel holder;
Two first elastic members arranged along the first direction among the four sides of the display panel arranged between the panel holder and the display panel;
Two second elastic members disposed along a second direction different from the first direction disposed between the panel holder and the display panel;
The length of each first elastic member is longer than the interval in the first direction of the two second elastic members,
The length of each second elastic member is longer than the interval in the second direction of the two first elastic members,
The display device, wherein an end of the first elastic member is bent along a side surface of the second elastic member. The first elastic member includes a slit at an end,
The display device according to claim 1, wherein the first elastic member is disposed such that the slits of the first elastic member are pressed against each other at two positions on a side surface of the second elastic member. The corner portion of the panel holder includes a rib member provided at an interval narrower than the sum of the width of the first elastic member and the width of the second elastic member,
The display device according to claim 1, wherein the rib member sandwiches and fixes the first elastic member and the second elastic member at a corner portion of the panel holder.   4. The display device according to claim 1, wherein an end portion of the first elastic member is bent so as to be parallel to the second elastic member. 5. The first elastic member includes an adhesive portion that adheres to the panel holder on the center side of the first elastic member,
5. The display device according to claim 1, wherein the first elastic member does not provide the adhesive portion on an end side of the first elastic member.   The display device according to claim 5, wherein the first elastic member includes a slidable sheet on an end side of the first elastic member.

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