JP2017009797A - Display device and television receiver - Google Patents

Abstract

A display device and the like that suppress the occurrence of uneven brightness on a display screen. A display device includes a shallow dish-shaped fixed chassis that fixes a plurality of light sources on one surface, a plate-shaped diffusion plate that diffuses light incident from the plurality of light sources, and the diffusion plate. A display panel 12 that displays an image on the front surface by the emitted light, a frame body that is disposed on the back side of the display panel 12 and has a plate-like portion 1611 that covers a front peripheral edge of the diffusion plate 14, and the plate-like shape And a buffer material 161a formed of a material that reflects or transmits light, interposed between the portion 1611 and the diffusion plate 14. [Selection] Figure 3

Description

  The present invention relates to a display device having a backlight for supplying light to a display panel.

  One type of backlight that supplies light to a display panel included in a display device is a direct-type backlight. In the direct type backlight, the light source is fixed to the bottom plate of the shallow dish-shaped backlight chassis. The light emitted from the light source enters the diffuser plate disposed substantially parallel to the bottom plate through the opening of the backlight chassis. The light incident on the diffusion plate is diffused and emitted as planar light, and irradiates the back surface of the display panel. The display panel displays an image on the front surface using light incident from the back surface. In the backlight, the diffusing plate is held by being fixed to the backlight chassis so that the frame-like member covers the diffusing plate.

  In recent years, in a display device such as a television receiver, in order to realize a narrow frame, a frame-like member that covers the periphery of the diffusion plate extends to the inside of the device. As a result, the frame-shaped member blocks the light of the backlight or absorbs the light, thereby causing uneven brightness at the peripheral edge of the display screen.

  Patent Document 1 describes that in a display device, in order to prevent luminance unevenness due to the frame-shaped member, a part of the frame-shaped member is formed of a transparent material.

JP 2014-21295 A

  On the other hand, a buffer material is provided between the peripheral edge of the diffusion plate and the frame-like member that holds the peripheral edge in order to prevent the peripheral edge from being damaged. Conventionally, the buffer material has been composed of a black member to prevent light leakage. For this reason, the buffer material blocks or absorbs light from the backlight, which causes luminance unevenness at the peripheral edge of the display screen. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a display device and the like that suppress the occurrence of luminance unevenness on a display screen.

  The display device according to the present invention includes a shallow dish-shaped fixed chassis in which a plurality of light sources are fixed on one surface, a plate-shaped diffusion plate that diffuses light incident from the plurality of light sources, and light emitted from the diffusion plate. A display panel that displays an image on the front surface, a frame that is disposed on the back side of the display panel and has a plate-like portion that covers the front peripheral edge of the diffusion plate, and is interposed between the plate-like portion and the diffusion plate. And a buffer material made of a material that reflects or transmits light.

  The display device according to the present invention is characterized in that the plate-like portion is parallel to the back surface of the display panel and extends to a display area inside the frame area on the periphery of the display panel.

  The display device according to the present invention is characterized in that the plate-like portion is formed of a white resin.

  A television receiver according to the present invention includes the display device described above and a receiving unit that receives a television broadcast, and displays video on the display device based on the television broadcast received by the receiving unit. It is characterized by being displayed.

  In the present invention, it is possible to suppress the occurrence of uneven brightness on the display screen.

It is an external appearance perspective view which shows the structural example of a display apparatus. It is a disassembled perspective view of the principal part of a display apparatus. It is a fragmentary longitudinal cross-section which shows the structure of the principal part of a display apparatus. It is a fragmentary perspective view of a panel chassis. It is a fragmentary perspective view of the panel chassis in which the buffer material was affixed.

Embodiment 1
Hereinafter, embodiments will be described with reference to the drawings. In the following description, up and down, front and rear, and left and right indicated by arrows in the figure are used. The rear surface may be described as the back surface. FIG. 1 is an external perspective view showing a configuration example of the display device 1. The display device 1 is configured as a television receiver including a liquid crystal display panel (display panel) 12, a receiving unit 22, and a power supply unit 23. In FIG. 1, the display device 1 is provided with stands 3 and 3 for installation in a vertical posture on a plane such as a table.

  The receiving unit 22 receives a television broadcast via an antenna (not shown). The liquid crystal display panel 12 displays an image based on the received television broadcast. The power supply unit 23 supplies power to each unit of the display device 1.

  FIG. 2 is an exploded perspective view of the main part of the display device 1. The display device 1 includes a front frame 11, a liquid crystal display panel (display panel) 12, an optical sheet 13, a diffusion plate 14, a reflection sheet 15, a panel chassis (frame body) 16, an LED substrate 17, and a backlight chassis (fixed chassis) 18. A diffusion plate holder 19, a middle cabinet 20, and a rear cabinet 21.

  The backlight chassis 18 has a rectangular plate-like bottom plate and has a shallow dish shape with one surface opened. The backlight chassis 18 is formed of a metal such as a steel plate.

  An LED substrate 17 having an LED (Light Emitting Diode) 17a as a light source on one side is fixed to the bottom plate of the backlight chassis 18.

  On the front side of the LED substrate 17, a reflection sheet 15 obtained by shaping a white rectangular sheet into a box shape is attached. The bottom surface of the reflection sheet 15 is substantially the same shape as the bottom plate surface of the backlight chassis 18. A light source hole 151 penetrating at a position corresponding to the LED 17 a is provided on the bottom surface of the reflection sheet 15. The LED 17a protrudes forward from the light source hole 151. Side surfaces extending obliquely from the rectangular bottom surface of the reflection sheet 15 extend to the opening of the backlight chassis 18.

  A frame-shaped diffusion plate holder 19 is attached to the periphery of the opening of the backlight chassis 18. The diffusion plate holder 19 is made of a synthetic resin such as PC (polycarbonate) or ABS resin (acrylonitrile, butadiene, styrene copolymer synthetic resin). On the front surface of the diffusion plate holder 19, the end portion of the side surface portion of the reflection sheet 15 is placed.

  The diffusion plate 14 has a rectangular plate shape that is substantially the same size as the opening of the backlight chassis 18. The diffuser plate 14 diffuses and shapes light incident from the back surface and emits the light from the front surface. The rear peripheral edge of the diffusion plate 14 is placed on a diffusion plate holder 19 attached to the backlight chassis 18.

  The panel chassis 16 has a frame shape. The panel chassis 16 is fixed to the backlight chassis 18 so as to cover the front peripheral edge of the diffusion plate 14.

  The backlight chassis 18, the LED substrate 17, the panel chassis 16, the reflection sheet 15, and the diffusion plate 14 constitute a backlight. In the backlight, the light of the LED provided on the LED substrate 17 is incident from the back surface of the diffusion plate 14. The light is emitted from the front surface diffused and shaped by the diffusion plate 14. Light that does not enter the diffusion plate 14 is reflected by the reflection sheet 15 and enters the diffusion plate 14.

  The optical sheet 13 includes a plurality of substantially rectangular sheets having a function of diffusing or condensing incident light.

  The liquid crystal display panel 12 has a horizontally long rectangular plate shape and displays an image on the front surface.

  The front frame 11 has a horizontally long rectangular frame shape. The front frame 11 is made of aluminum, synthetic resin, or the like.

  The middle cabinet 20 has a rectangular frame shape and is a part that shapes the appearance of the side surface of the display device 1. The middle cabinet 20 is formed of a synthetic resin such as PC or ABS resin.

  The rear cabinet 21 has a rectangular bottom surface and has a box shape with one surface opened. The rear cabinet 21 is formed of a synthetic resin such as PC or ABS resin.

  FIG. 3 is a partial longitudinal sectional view showing the structure of the main part of the display device 1. A method of assembling the display device 1 will be briefly described with reference to FIG. Prepare the backlight described above. In FIG. 3, a panel chassis member 161 constituting one side of the panel chassis 16 is shown. The panel chassis 16 is fixed to the backlight chassis 18 so as to cover the front peripheral edge of the diffusion plate 14. A buffer material 161 a is interposed between the panel chassis 16 and the diffusion plate 14.

  When the display device 1 is assembled, the peripheral edge of the optical sheet 13 is placed on the panel chassis 16. Further, the liquid crystal display panel 12 is placed on the panel chassis 16 with the buffer material 12a interposed. In the panel chassis 16, the portion on which the liquid crystal display panel 12 is placed is outside the portion on which the optical sheet 13 is placed.

  The front frame 11 is fixed to the backlight chassis 18 so as to cover the front peripheral edge and the peripheral side of the liquid crystal display panel 12. The rear cabinet 21 is fixed to the backlight chassis 18 together with the middle cabinet 20 with screws so that the middle cabinet 20 covers the side surface and the rear cabinet 21 covers the rear side.

  Next, the cushioning material provided between the panel chassis 16 and the diffusion plate 14 will be described. FIG. 4 is a partial perspective view of the panel chassis 16. FIG. 5 is a partial perspective view of the panel chassis 16 to which the cushioning material 161a is attached. FIG. 4 shows a rod-shaped panel chassis member 161 that constitutes one side of the frame-shaped panel chassis 16. Moreover, the buffer material 161a attached to the panel chassis member 161 is shown.

  The panel chassis member 161 is a long member having a T-shaped cross section. The panel chassis member 161 includes a main plate portion (plate-like portion) 1611 extending in the vertical direction, a first top plate portion 1612 protruding forward from the main plate portion 1611, and a second top plate protruding rearward from the main plate portion 1611. Part 1613. The first top plate portion 1612 is provided discontinuously in the left-right direction. Similarly, the second top plate portion 1613 is provided discontinuously in the left-right direction. A fixing portion 1614 having a through hole is provided at a location where the second top plate portion 1613 is discontinuous. A convex portion provided in the backlight chassis 18 is fitted into the through hole of the fixing portion 1614. Thereby, the panel chassis member 161 is fixed to the backlight chassis 18.

  A buffer material 161 a is attached to the rear surface of the main plate portion 1611 of the panel chassis member 161. As shown in FIG. 4, the cushioning material 161 a is a rod-like member having a rectangular cross section and long to the left and right. The buffer material 161a is formed of white urethane or the like. The buffer material 161a is preferably formed of a microcell polymer sheet having a high density, a fine and uniform cell structure.

  The cushioning material 161 a attached to the rear surface of the main plate portion 1611 of the panel chassis member 161 is in contact with the front peripheral edge portion of the diffusion plate 14. Accordingly, the panel chassis member 161 can sandwich and fix the diffusion plate 14 with the diffusion plate holder 19 without damaging the front surface of the diffusion plate 14.

As described above, in the display device 1 according to the first embodiment, it is desirable to reduce the width d ₀ of the front portion of the front frame 11 as much as possible in order to realize a narrow frame. On the other hand, the diffusion plate 14 is thermally expanded by the operating environment. Therefore, the distance d ₁ between the end surface of the diffusion plate 14 and the opposing surface of the diffusion plate holder 19 that faces the end surface needs to ensure a length in which the expanded diffusion plate 14 can be accommodated. From the above, in the display device 1 according to the first embodiment, the front end of the main plate portion 1611 of the panel chassis member 161 extends to a position on the inner side (lower side) of the frame region at the periphery of the display region of the liquid crystal display panel 12. ing. It is the black matrix 121 that defines the display area. In FIG. 5, the frame area is above the boundary line L, and the display area (active area) is below the boundary line L. That is, the main plate portion 1611 extends to the display area of the liquid crystal display panel 12. For this reason, when the buffer material 161a attached to the main plate portion 1611 is black as in the prior art, the buffer material 161a absorbs part of the light emitted from the diffusion plate 14. Thereby, luminance unevenness occurs in the liquid crystal display panel 12. However, in the first embodiment, since the buffer material 161a is white, the buffer material 161a reflects light, and thus it is possible to suppress the occurrence of uneven brightness in the liquid crystal display panel 12. The buffer material 161a is not limited to white. For example, cream color or yellow color having excellent light reflection performance may be used.

Embodiment 2
The second embodiment relates to a configuration in which the cushioning material 161a is formed of a transparent material. Since the other configuration is the same as that of the first embodiment, the description thereof is omitted. In the second embodiment, the buffer material 161a is made of, for example, transparent PVC (Polyvinyl Chloride), polyurethane, or silicone. The buffer material 161a is a transparent member as a whole.

  In Embodiment 2, since the buffer material 161a is formed of a transparent material, the light emitted from the diffusion plate 14 is transmitted and is not absorbed. Thereby, it is possible to suppress the occurrence of uneven brightness in the liquid crystal display panel 12.

Embodiment 3
The third embodiment relates to a configuration in which the panel chassis 16 is formed of a white resin. Since the other configuration is the same as that of the first embodiment, the description thereof is omitted. In the third embodiment, for example, the panel chassis 16 is formed of a white resin such as polycarbonate or ABS resin.

  In Embodiment 3, the light emitted from the diffusion plate 14 is reflected by forming the panel chassis 16 from white resin. Thereby, it is possible to suppress the occurrence of uneven brightness in the liquid crystal display panel 12. In addition, in the panel chassis 16, since it is a front-end | tip part of the main board part 1611 that is concerned with generation | occurrence | production of brightness irregularity, it is good also considering only the said front-end | tip part as white.

The technical features (components) described in each embodiment can be combined with each other, and new technical features can be formed by combining them.
It should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined not by the above-mentioned meaning but by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

  The following matters are further disclosed regarding the above embodiment.

  The display device (1) according to the present invention includes a shallow dish-shaped fixed chassis (18) in which a plurality of light sources (17a) are fixed on one surface, and a plate-like shape that diffuses light incident from the plurality of light sources (17a). A diffuser plate (14), a display panel (12) for displaying an image on the front surface by light emitted from the diffuser plate (14), and a rear panel side of the display panel (12). ) Between the plate (1611) having the plate-like portion (1611) covering the front peripheral edge of the) and the plate-like portion (1611) and the diffusion plate (14), and is a material that reflects or transmits light. And a formed cushioning material (161a).

  In the present invention, since the buffer material (161a) positioned between the plate-like portion (1611) and the diffusion plate (14) is formed of a material that reflects or transmits light, the buffer material (161a) It is possible to suppress the occurrence of luminance unevenness of the display panel (12) due to the absorption of light.

  In the display device (1) according to the present invention, the plate-like portion (1611) is parallel to the back surface of the display panel (12) and extends to a display area inside the frame area on the periphery of the display panel (12). It is characterized by existing.

  In the present invention, since the plate-like portion (1611) extends to the display area inside the frame area, it is possible to realize a narrow frame of the display device (1).

  The display device (1) according to the present invention is characterized in that the plate-like portion (1611) is formed of a white resin.

  In the present invention, the plate-like portion (1611) is made of white resin, and the plate-like portion (1611) reflects incident light. Thereby, it is possible to suppress the occurrence of luminance unevenness of the display panel (12).

  A television receiver according to the present invention includes the display device described above and a receiving unit (22) that receives a television broadcast, and based on the television broadcast received by the receiving unit (22), An image is displayed on the display device.

  In the present invention, the buffer material (161a) interposed between the plate-like portion (1611) and the diffuser plate (14) reflects or transmits light, so that unevenness in luminance of the display panel (12) is generated. It becomes possible to suppress.

DESCRIPTION OF SYMBOLS 1 Display apparatus 11 Front frame 12 Liquid crystal display panel (display panel)
121 Black matrix 13 Optical sheet 14 Diffusion plate 15 Reflective sheet 151 Light source hole 16 Panel chassis (frame body)
161 Panel chassis member 161a Buffer material 1611 Main plate portion (plate-shaped portion)
1612 1st top plate part 1613 2nd top plate part 1614 Fixing part 17 LED board 17a LED (light source)
18 Backlight chassis (fixed chassis)
19 Diffusion plate holder 20 Middle cabinet 21 Rear cabinet 22 Receiver 23 Power supply 3 Stand

Claims (4)

A shallow dish-shaped fixed chassis in which a plurality of light sources are fixed on one surface;
A plate-like diffusion plate that diffuses light incident from the plurality of light sources;
A display panel that displays an image on the front surface by light emitted from the diffusion plate;
A frame that is disposed on the back side of the display panel and has a plate-like portion that covers the front peripheral edge of the diffusion plate;
A display device comprising: a buffer material formed of a material that is interposed between the plate-like portion and the diffusion plate and reflects or transmits light. 2. The display device according to claim 1, wherein the plate-like portion is parallel to a back surface of the display panel and extends to a display region inside a frame region around the display panel. The display device according to claim 1, wherein the plate-like portion is formed of a white resin. A display device according to any one of claims 1 to 3,
A receiver for receiving television broadcasts,
A television receiver, wherein an image is displayed on the display device based on the television broadcast received by the receiving unit.

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