JPH1195214A - Plane form display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability of replacing a light source of a plane form display device and to improve its display quality. SOLUTION: A liquid crystal panel 22 is held and fixed between a bezel 23 and a frame 51 of a backlight unit 24. A back side end part 41 of the bezel 23 is turned up on the top side. The bezel 23 and the frame are fastened by engaging a pawl part formed on the frame 51 with this end part 41. A circuit substrate 26 is placed on the back side of the backlight unit 24. This circuit substrate 26 is connected with the liquid crystal panel 22 via a flexible wiring substrate 25. When a light source 45 of the backlight unit 24 is replaced, the flexible wiring substrate 25 is abutted on the peripheral part 42 formed by bending and also abutted on the end part 41, and is prevented from being damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar display device having planar display means.

[0002]

2. Description of the Related Art In recent years, a liquid crystal display device, which is a planar display device provided with a planar display device such as a flat surface, has features of being thinner, lighter, and lower in power consumption than conventional display devices such as a CRT. It is used in various fields.

The configuration of a conventional liquid crystal display device will be described with reference to FIGS. The liquid crystal display device 1 includes a liquid crystal panel 2 having a substantially rectangular planar shape, a frame-shaped bezel 3 for sandwiching the liquid crystal panel 2 from the front and back, a planar light source device 4 having a substantially rectangular planar shape, and a flexible wiring board 5. And a circuit board 6 connected to the liquid crystal panel 2.

[0006] The liquid crystal panel 2 has a pair of electrode substrates.
A liquid crystal material is held between 2a and 2b via a light distribution film or the like. The circuit board 6 generates a control signal such as a clock signal, video data, a driving voltage, and the like. Further, the flexible wiring board 5 has a flexible sheet shape or the like, and electrically connects the liquid crystal panel 2 and the circuit board 6 to supply a desired electric signal to the liquid crystal panel 2. On the other hand, the frame-shaped bezel 3 is made of metal and has a front plate portion 3a provided with an opening corresponding to the effective display area of the liquid crystal panel 2, and a side plate protruding from the outer peripheral portion of the front plate portion 3a to the rear surface side. Unit 3b. Further, the planar light source device 4 is also called a backlight unit or the like, and is disposed along the back surface of the liquid crystal panel 2 and has an acrylic light guide plate 8 having a scatterer formed on the back surface side.
And a linear light source 9 such as a fluorescent tube arranged along one end of the light guide plate 8 and a reflector that covers the light source 9 and effectively guides light emitted from the light source to the light guide plate. a reflector
10 and a resin frame 11 for holding and fixing the liquid crystal panel 2 between the bezel 3 and the like. The frame 11 of the planar light source device 4 is screwed to the bezel 3 by a screw inserted from the back side.

However, in this configuration, when the bezel 3 is attached or when the light source 9 is replaced due to its life,
At the time of bending the flexible wiring board 5 connected to the liquid crystal panel 2 to the outer peripheral side and expanding the circuit board 6 to the outer peripheral side, the edge 12 of the tip of the side plate portion 3b of the bezel 3 is attached to the flexible wiring board 5. If the flexible wiring board 5 is damaged by the contact, there is a problem that quality defects such as display defects occur.

Since the frame 11 and the like are fixed to the bezel 3 by screws from the back side, the bezel 3 is attached to the liquid crystal panel 2 when the liquid crystal display device 1 is assembled.
After the liquid crystal display device 1 is turned over, the liquid crystal display device 1 is turned upside down and screwed from the back side.
Need to be turned over again, which makes it difficult to improve workability and productivity.

Further, as shown in FIG. 7, for example, a reflector covering the light source 9 is constituted by a flexible reflection sheet 14, and
This reflection sheet 14 is held by a metal light source cover 15,
A configuration in which the light source cover 15 is fixed using fixing screws or the like is known.

However, in the configuration shown in FIG.
When replacing the light source 9, the fixing screw of the metal light source cover 15 is removed, the light source cover 15 is removed, the light source 9 is replaced, the position of the light source cover 15 is determined, and again, There is a problem that an operation of fixing using a fixing screw is required, and it is difficult to improve workability and productivity.

[0009]

As described above, in the configuration shown in FIGS. 5 and 6, the flexible wiring board connected to the liquid crystal panel is moved around when the bezel is attached or when the light source is replaced due to its life. When the circuit board is bent to the side and the circuit board is deployed to the outer peripheral side, the edge of the tip of the side plate of the bezel abuts on the flexible wiring board, and if this flexible wiring board is damaged, poor quality such as display failure may occur. Have problems that arise. In the configuration shown in FIG. 7, when replacing the light source, the fixing screw of the metal light source cover is removed, the light source cover is removed, the light source is replaced, and the position of the light source cover is determined. Then, it is necessary to perform the operation of fixing using the fixing screws again, and there is a problem that it is difficult to improve workability and productivity.

The present invention has been made in view of the above points, and provides a planar display device which is excellent in workability of assembling work and maintenance work, can easily improve productivity, and can improve the quality of display and the like. The purpose is to do.

[0011]

A planar display device according to the present invention comprises a display panel having a display surface portion, a frame portion disposed on the front surface side of the display panel, and an outer peripheral side of the display panel. A frame body having an edge formed by folding an end on the back side of the side plate toward the front side, a circuit board disposed on the back side of the display panel, A flexible wiring means is provided on an outer peripheral side of the display panel and electrically connects the display panel to the circuit board.

In this configuration, the edge of the side plate of the frame on the back side is folded back toward the front surface to form an edge. Therefore, a flexible wiring means is provided on the edge during assembly work or the like. Even if it abuts, damage to the wiring means is suppressed.

Further, by providing a frame having a support portion disposed on the back surface side of the display panel and an engaging portion engaging with the folded end of the side plate portion of the frame, The display panel is engaged with the frame, and the display panel is easily held between the frame and the frame.

Further, the planar display device of the present invention comprises a display panel provided with a display surface portion, a frame portion disposed on the front side of the display panel, and a side plate portion disposed on the outer peripheral side of the display panel. A frame provided, a light guide disposed on the back side of the display panel, a light source disposed at an end of the light guide,
And illumination means having a reflection sheet covering the light source,
A reflector cover is provided on the back side and the outer peripheral portion of the reflection sheet, and hinge means for connecting the frame and the reflector cover are provided.

In this configuration, since the reflector cover disposed on the back surface and the outer peripheral portion of the reflection sheet is connected to the frame by hinge means, the hinge means is used as a hinge and the reflector cover is opened. The light source can be easily replaced, and even when the reflector cover is closed, the positioning of the reflector cover is facilitated, and the productivity is improved.

Further, by using the frame, the reflector cover and the hinge means each having conductivity, the frame and the reflector cover are electrically connected to each other via the hinge means, and the influence of noise generated from the light source is obtained. Is reduced.

Further, the structure is simplified by using an adhesive tape for the hinge means.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the planar display device of the present invention will be described with reference to the drawings.

1 to 4, reference numeral 21 denotes a liquid crystal display device as a planar display device. The liquid crystal display device 21 includes a liquid crystal panel 22 as a display panel, and a frame for sandwiching the liquid crystal panel 22 from the front and back. Bezel 23 and a backlight unit 24 as a planar light source device as an illumination means
And a circuit board 26 connected to the liquid crystal panel 22 via two flexible wiring boards 25 as wiring means.

The liquid crystal panel 22 has a flat, substantially rectangular plate shape and holds a liquid crystal material between a pair of electrode substrates 31 and 32 via a light distribution film or the like. On the side, an effective display area 33 having a diagonal size of 12.1 inches is formed as a display surface.

The circuit board 26 has a plate shape, and constitutes a drive circuit board for generating control signals such as clock signals, video data and drive voltages.

Further, the flexible wiring board 25 is formed in a flexible sheet shape or the like which can be bent, and when the liquid crystal display device 21 is assembled, as shown in FIG. One end of the substrate 26 is mechanically connected to each other, the output end is electrically connected to the liquid crystal panel 22, the input end is electrically connected to the circuit board 26, and the liquid crystal panel 22 and the circuit board 26 are connected to each other. It is electrically connected to supply a desired electrical signal to the liquid crystal panel 22.

On the other hand, the frame-shaped bezel 23 is made of conductive metal, and has a front plate portion 36 as a frame portion provided with an opening 35 corresponding to an effective display area 33 of the liquid crystal panel 22; Part 36
And a side plate portion 37 protruding from the outer peripheral portion to the rear surface side. Then, the side plate portion 37 has both sides along the short direction, and the rear end portion 41 of the portion along the longitudinal direction on the side where the flexible wiring board 25 is provided is in close contact with the inside of the side plate portion 37. Is bent toward the front surface side, that is, so-called hemming bending is performed, and this bent portion forms an edge portion 42 of the side plate portion 37.

The backlight unit 24 has a light guide plate 44 as an acrylic light guide having a scatterer formed on the back surface side, which is formed along the back surface of the liquid crystal panel 22 and has a substantially rectangular shape in a plane. Have. Then, linear light sources 45, such as a straight tube fluorescent lamp, are arranged along both ends along the longitudinal direction of the light guide plate. Further, reflectors 46, 47 which cover a part of each of the light sources 45, 45 and reflect the light emitted from the light sources 45, 45 to effectively guide the light to the light guide plate 44 are arranged. The reflector 46 on one side on which the circuit board 26 is disposed is formed, for example, by attaching a reflection sheet to a plate material or forming a substantially U-shape from a metal reflection plate. The reflector 47 on the other side includes a flexible reflection sheet.

Further, the backlight unit 24 includes an outer peripheral portion of the light guide plate 44, light sources 45, 45 and reflectors 46, 47.
A frame 51 made of a resin and supporting the like is provided. In the frame 51, an opening 51a having substantially the same shape as the opening 35 of the bezel 23 is formed, and the periphery of the opening 51a serves as a support portion 51b for supporting the liquid crystal panel 22. Further, as shown in FIG. 2, the long sides 52, 52 on both sides along the longitudinal direction of the frame 51 are formed in an arc shape in cross section, and support the upper parts of the reflectors 46, 47. I have. As shown in FIG. 3, the short sides 54 and 55 on both sides of the frame 51 along the lateral direction have claw portions 57 as engaging portions formed on an outer surface at a plurality of places. A board engaging claw 58 is formed on the lower side. A lead wire 59 connected to each light source 45 is led out of the backlight unit 24, and a connector 60 is provided at the tip of the lead wire 59.

As shown in FIG. 2, a reflector cover for covering the portion from the lower side of the backlight unit 24 to the outer peripheral side along the longitudinal direction of the liquid crystal display device 21 on which the flexible wiring board 25 is not provided. 62 are provided. And
The reflector cover 62 is formed of a conductive metal or the like, and has a substantially L-shaped cross section including a side plate 63 and a back plate 64. Then, attach this side plate 63 to the side plate of the bezel 23.
The outer surface of the side plate 63 is connected to the outer surface of the bezel 23 by a pressure-sensitive adhesive tape 66 as a hinge means having conductivity, that is, a tape with a conductive adhesive, in a state of abutting against the lower end of the 37. The back plate portion 64 is located on the back surface side of the light source 45 and the reflection sheet 48, and is detachably attached to the frame 51 and the like by screws (not shown).

As shown in FIG. 2, the liquid crystal display device 21 includes a front plate 36 of the bezel 23 and a backlight unit.
The bezel 23 and the frame 51 are fitted with each other by disposing the liquid crystal panel 22 between the support portion 51b of the frame 51 and the support portion 51b of the frame 51, so that the end 41 of the bezel 23 and the claw portion 57 of the frame 51 are engaged. In this state, the bezel 23, the liquid crystal panel 22, and the backlight unit 24 are fixed to each other while the liquid crystal panel 22 is sandwiched from the front side and the back side. Also, LCD panel
Flexible wiring board 25 connected to 22
The circuit board 26 is disposed on the back side of the backlight unit 24, and the circuit board 26 is held by being engaged with the board engaging claws 58 of the frame 51. That is, in this state, the light source 45 and the reflector 46 on one side are arranged via the frame 51 on the back surface side of the portion of the liquid crystal panel 22 connected to the flexible wiring board 25.

In addition, the liquid crystal display device 21 drives the liquid crystal panel 22 by outputting a signal from the circuit board 26 via the flexible wiring board 25 in accordance with an input signal from another device, and controls the light sources 45, 45 When the light is turned on and the light guide plate 44 uniformly emits light in a planar shape, information such as characters and figures is displayed on the front surface side.

According to the liquid crystal display device 21 which is a flat display device, the liquid crystal panel 22 includes the bezel 23 and the frame.
The hemming bend end 41 of the bezel 23, located between 51 and 41
Can be fixed by engagement with the claw portion 57 of the frame 51,
The assembly workability and productivity can be improved, and the manufacturing cost can be reduced.

The end 41 of the hemming bend and the claw
These bezel 23, LCD panel 22,
In addition, the backlight unit 24 can be fixed. In this case, the backlight unit 24 can be assembled without using screws or the like, and the number of parts can be reduced. In addition, bezel
Since screwing work from the back side after attaching 23 is not necessary, image quality inspection can be performed without turning over the liquid crystal display device 21 after attaching the bezel 23, assembling workability,
Productivity can be improved. In addition, since no screws are used, there is no need to protrude the liquid crystal display device 21 on the surface side, which is the main plane, and the appearance can be easily improved.

Further, the edge 42 of the bezel 23 can be easily formed into a smooth curved surface by hemming. Therefore, when attaching the bezel 23 or performing replacement work due to the life of the light source 45, as shown in FIG.
When bending the circuit board 26 by bending the outer periphery 25, the flexible wiring board 25 abuts against the curved edge 42,
Since the flexible flexible wiring board 25 does not come into contact with the end 41 of the bezel 23, that is, the edge where burrs or the like are likely to occur, it is possible to prevent poor quality such as display failure due to damage of the flexible wiring board 25.

Further, with respect to the light source 45 on the other side, the light source 45 is covered with a reflection sheet 48, and a metal reflector cover 62 disposed on the back side and the outer periphery side of the reflection sheet 48 is used to cover the reflection sheet 48. While maintaining the position and shape,
Since the reflector cover 62 is connected to the bezel 23 by the adhesive tape 66, the adhesive tape 66 functions as a hinge, and the reflector cover 62 can be easily opened and closed. So the light source
When replacing 45, first remove the fixing screw of the reflector cover 62, rotate the reflector cover 62 to open it, and then
Is replaced, and the reflector cover 62 is rotated and closed again, and a series of steps of fixing with the fixing screw is sufficient.In other words, the positioning work of the removed reflector cover becomes unnecessary, and the number of assembly steps is reduced. Thus, the replacement work of the light source 45 can be easily and efficiently performed, the productivity can be improved, and the manufacturing cost can be reduced.

Further, bezels 2 each having conductivity
3. By using the reflector cover 62 and the adhesive tape 66, the bezel 23 and the reflector cover 62 can be electrically connected via the adhesive tape 66. Therefore,
During normal use of the liquid crystal display device 21, the influence of noise generated from the light source 45 such as a fluorescent lamp can be reduced, and the display quality can be improved.

A circuit board 26 for driving the liquid crystal panel 22
Is arranged on the back side of the liquid crystal panel 22 via the frame 51, and the light source 45 is also arranged on the back side of the liquid crystal panel 22, so that the effective display area 33 does not perform display, so to speak, a frame. The front plate portion 36 of the frame 51 is formed narrow, and the device can be downsized.

In the above embodiment, the light guide plate 44 having a substantially constant thickness is used, and the light sources 45, 45 are arranged along both sides of the light guide plate 44. The edge 42 of the hemming bend is formed, and the metal reflector cover 62 that can be opened and closed with respect to the other light source 45 is provided.For example, the edge of the hemming bend is formed for the light sources on both sides,
Alternatively, a metal reflector cover that can be opened and closed with respect to the light sources on both sides can be provided. Furthermore, each of these configurations can be combined with a configuration in which a light source is arranged only on one side of the light guide and the brightness is made uniform by appropriately changing the thickness dimension of the light guide.

Further, according to the present invention, as a planar display device,
In addition to liquid crystal display devices, plasma display devices, EL display devices,
The present invention can be applied to a planar display device configured to be flat or curved, such as a display device using LEDs.

[0037]

According to the planar display device of the present invention, the edge on the back surface side of the side plate portion of the frame body is folded back toward the front surface side to form an edge portion. Even if the wiring means contacts the edge, damage to the wiring means can be suppressed, and the quality of display and the like can be improved. Further, productivity can be improved without increasing the number of parts.

Further, by providing the frame provided with the support portion disposed on the back side of the display panel with an engaging portion for engaging the folded end of the side plate portion of the frame, the frame and the frame And the display panel can be sandwiched and held between these frames, so that the assembling work can be facilitated, and the number of parts does not increase and the productivity can be improved.

Further, according to the planar display device of the present invention, since the reflector covers disposed on the back side and the outer peripheral portion of the reflection sheet are connected to the frame by the hinge means, the hinge means is used as a hinge to reflect light. By opening the body cover, the light source can be easily replaced. Also, when closing the reflector cover, the positioning of the reflector cover is facilitated, and the productivity can be improved.

Further, by using the frame, the reflector cover, and the hinge means each having conductivity, the frame and the reflector cover are electrically connected to each other via the hinge means, and the influence of noise generated from the light source is obtained. Can be reduced.

Further, by using an adhesive tape for the hinge means, the structure can be simplified and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view taken along a line AA in FIG. 4 showing the operation of an embodiment of the planar display device of the present invention.

FIG. 2 is a cross-sectional view of the top-surface display device taken along a line AA in FIG. 4;

FIG. 3 is a cross-sectional view of the top surface display device taken along a line BB in FIG. 4;

FIG. 4 is an exploded perspective view of the top display device.

FIG. 5 is a partial cross-sectional view illustrating an example of a conventional planar display device.

FIG. 6 is a partial cross-sectional view showing an operation of the top display device.

FIG. 7 is a partial cross-sectional view showing another example of the conventional planar display device.

[Explanation of symbols]

 21 Liquid crystal display device as planar display device 22 Liquid crystal panel as display panel 23 Bezel as frame 24 Backlight unit as lighting means 25 Flexible wiring board as wiring means 26 Circuit board 33 Effective display area as display surface 36 Front plate part as frame part 37 Side plate part 41 End part 42 Edge part 44 Light guide plate as light guide 45 Light source 48 Reflection sheet 51 Frame 51b Support part 57 Claw part as engagement part 62 Reflector cover 66 Hinge Adhesive tape as a means

Claims (6)

[Claims] A display panel provided with a display surface portion; a frame portion disposed on a front surface side of the display panel; and a side plate portion disposed on an outer peripheral side of the display panel, and a back side of the side plate portion. A frame provided with an edge formed by folding an end of the display panel toward the front side, a circuit board disposed on the back side of the display panel, and a display panel disposed on the outer peripheral side of the display panel. And a flexible wiring means for electrically connecting the circuit board and the circuit board. 2. A display panel provided with a display surface portion, a frame having a frame portion disposed on the front side of the display panel and a side plate portion disposed on the outer peripheral side of the display panel, and the display panel. A light guide disposed on the back side of the light guide, a light source disposed at an end of the light guide, and an illuminating means including a reflection sheet covering the light source; and a light guide disposed on the rear side and the outer periphery of the reflection sheet. A planar display device comprising: a reflector cover; and hinge means for connecting the frame body and the reflector cover. 3. A display panel having a display surface portion, a frame portion disposed on the front surface side of the display panel, and a side plate portion disposed on an outer peripheral side of the display panel, and a back surface side of the side plate portion. A frame body provided with an edge formed by folding an end of the light guide toward the front surface side, a light guide disposed on the back side of the display panel, a light source disposed on an end of the light guide, A lighting unit having a reflecting sheet covering the light source; a reflector cover disposed on the back side and the outer peripheral portion of the reflecting sheet; a hinge means for connecting the frame and the reflector cover; and the display panel. A circuit board disposed on the back side of the display panel; and flexible wiring means disposed on an outer peripheral side of the display panel and electrically connecting the display panel to the circuit board. Display device. 4. A frame comprising: a support portion disposed on a rear surface side of a display panel; and an engaging portion engaging with a folded end portion of a side plate portion of a frame body. Item 4. The planar display device according to item 1 or 3. 5. The frame, the reflector cover, and the hinge means each have conductivity.
Or the planar display device according to 3. 6. The planar display device according to claim 2, wherein the hinge means is an adhesive tape.