JP2006106349A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device in which the production of noises on a reflector is suppressed. <P>SOLUTION: The liquid crystal display device is equipped with a liquid crystal display panel provided with a display region on which a plurality of pixels are aligned, a surface light source device which illuminates the liquid crystal display panel from the rear face side, and a back frame which supports the liquid crystal display panel and the surface light source device. The surface light source device is equipped with a light source, a light guide body which converts light emitted from the light source into plane light, and a reflection body which reflects the light emitted from the light source toward the light guide body. The reflection body has a conductive section which is protruded to the outside of the back frame. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a liquid crystal display device including a liquid crystal display panel and a surface light source device.

  In general, a liquid crystal display device includes a liquid crystal display panel that displays an input image and a surface light source device that illuminates the liquid crystal display panel from the back. The liquid crystal display panel and the surface light source device are supported by the back frame and held around the bezel cover.

  The surface light source device includes a light source, a light guide that emits light emitted from the light source into planar light, and a reflector as a reflector that causes the light emitted from the light source to enter the light guide. At this time, if noise from the light source is generated in the reflector, the display image is deteriorated. Conventionally, the reflector and the bezel cover are screwed and the bezel is electrically connected to the external device.

In the liquid crystal display device having the above-described configuration, a device in which a surface light source device and a bezel cover are sandwiched and fixed by clips has been developed. (See Patent Document 1)
On the other hand, recently, liquid crystal display devices are required to be thin and light. Therefore, development of a thin and light bezel-less liquid crystal display device without a bezel cover is underway.
JP 2003-279935 A

  However, in the bezelless liquid crystal display device, it is not possible to take noise countermeasures by connecting the reflector and the bezel cover. Therefore, it is necessary to make the reflector and the external device conductive, but the conductive means is limited to means using a gasket or other metal parts. The above-described means has a problem that it takes time and effort because it is necessary to mount the bezel-less liquid crystal display device on an external device after processing so as to be conducted or using another component.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a liquid crystal display device that can be easily connected to the outside and prevents deterioration of a display image.

  A liquid crystal display device according to an aspect of the present invention includes a liquid crystal display panel having a display area in which a plurality of pixels are arranged, a surface light source device that illuminates the liquid crystal display panel from the back, the liquid crystal display panel, and the surface light source device. The surface light source device, the light source, a light guide that converts the light emitted from the light source into planar light, and the light emitted from the light source directed toward the light guide. And a reflector to be reflected, and the reflector has a conductive portion that projects to the outside of the back frame.

  ADVANTAGE OF THE INVENTION According to this invention, a liquid crystal display device which can carry out a reflector easily with the exterior and prevents deterioration of a display image can be provided.

  Hereinafter, a liquid crystal display device according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows an external perspective view of a liquid crystal display device 100 according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the liquid crystal display device 100 shown in FIG.

  As shown in FIGS. 1 and 2, the liquid crystal display device 100 has a substantially rectangular shape, and a surface light source device 30 that illuminates the liquid crystal display panel 10 is opposed to the back surface of the liquid crystal display panel 10. The liquid crystal display panel 10 and the surface light source device 30 are supported by a frame 32, and the periphery of the liquid crystal display panel 10 and the surface light source device 30 is fixed to the frame by a tape 20 such as a PET (polyethylene terephthalate) tape. Has been.

  The liquid crystal display panel 10 has a substantially rectangular display area 12 for displaying an image. The display area 12 is composed of a plurality of display pixels PX arranged in a matrix. In the display pixel PX, a plurality of signal lines Sg provided for each column to supply a write signal to the pixel groups in each column, and a plurality of signal lines Sg provided for each row to select a pixel unit in units of rows. The scanning line Sc is connected.

  The elongated rectangular flat driver circuit board 14 supplies a driving signal to the liquid crystal display panel 10 and is attached to one side edge of the liquid crystal display panel 10 via a pair of flexible elongated rectangular substantially flat printed wiring boards 16. Electrically connected. The driver circuit board 14 is arranged on the back surface of the surface light source device 30 by curving the printed wiring board 16 toward the back surface of the surface light source device 30. At this time, an elongated rectangular sheet-like insulating sheet 40 is interposed between the driver circuit board 14 and the surface light source device 30, and the insulating sheet 40 has an insulating property between the driver circuit board 14 and the surface light source device 30. Is secured.

  FIG. 3 shows a cross-sectional view of the surface light source device 30 of the liquid crystal display device 100 shown in FIG.

  The surface light source device 30 includes a cold cathode tube 34 as a light source, a light guide 36 for converting light emitted from the cold cathode tube 34 into a surface, and light emitted from the cold cathode tube 34 as light from the light guide 36. A reflector 37 is provided as a reflector to be incident on the incident surface 36a.

  The light guide 36 is formed in a wedge shape that gradually decreases in thickness in the normal direction of the light incident surface 36a with a resin having translucency. With such a shape, a space for accommodating the driver circuit board 14 is secured on the back side of the surface light source device 30. The light guide 36 emits light from the cold cathode tubes 34 incident from the light incident surface 36a toward the liquid crystal display panel 10 as planar light.

  A plurality of optical sheets 39 are arranged on the surface of the light guide 36 facing the liquid crystal display panel 10. The optical sheet 39 imparts predetermined optical characteristics to the planar light emitted from the surface of the light guide 36. For example, a light collecting sheet that collects the light emitted from the light guide 36, and For example, a diffusion sheet that diffuses emitted light. A reflection sheet 38 as an optical sheet is disposed on the back surface of the light guide 36. The reflection sheet 38 reflects the light leaking outside from the back surface of the light guide 36 so as to return it to the light guide 36.

  The cold cathode tube 34 as a light source is disposed along the light incident surface 36 a of the light guide 36. The reflector 37 is formed by bending a substantially flat reflector so that its cross section is substantially U-shaped, and has a pair of end portions 37 e facing an enclosing portion 37 d surrounding the cold cathode tube 34. The pair of end portions 37e sandwich the light guide 36 and the reflection sheet 38 from the thickness direction, and the reflector 37 reflects the light emitted from the cold cathode tube 34 toward the light incident surface 36a of the light guide 36. Here, the thickness direction of the light guide 36 is a direction substantially orthogonal to the surface of the light guide 36.

  FIG. 4 shows the structures of the end portions of the cold cathode tube 34 and the reflector 37. As shown in FIG. 4, lamp holders 33 are attached to both ends of the cold cathode tube 34, and wirings 35 connected to the outside extend from the lamp holders. The surrounding portion 37d of the reflector 37 surrounds the cold cathode tube 34 over its entire length in the longitudinal direction. However, the longitudinal direction of the reflector 37 is the L direction shown in FIG. 4, and the width direction is the W direction. The reflector 37 integrally includes a pair of conducting portions 37a that project from the longitudinal ends of the surrounding portion 37d to the outside of the back frame. The conducting portion 37a is a substantially flat plate shape extending in a direction substantially orthogonal to the side wall of the back frame, and has a through hole 37b for screwing. The reflector 37 including the conduction part 37a is formed of a conductive metal.

  FIG. 5 shows an example of an external perspective view of the liquid crystal display device 100 using the reflector 37 shown in FIG. In the liquid crystal display device 100 shown in FIG. 5, the conducting portion 37 a of the reflector 37 extends to the outside of the back frame 32. The conducting portion 37a is screwed to an external member by a screw (not shown) inserted through the through hole 37b, and is electrically connected to this member.

  As described above, the reflector 37 and the outside are easily connected to each other by screwing the reflector 37 and the outside by forming the conductive portion 37a including the through-hole 37b while projecting to the outer portion 37d of the reflector 37. be able to. This prevents the display image from being deteriorated by noise generated in the reflector 37.

  FIG. 6 shows another example of the liquid crystal display device 100 using the reflector 37 shown in FIG. In the liquid crystal display device 100 shown in FIG. 6, the conductive portion 37 a extending to the outside of the back frame 32 is bent along the outer surface of the back frame 32. In addition, through holes for screwing are formed in the back frame 32 in accordance with the positions of the through holes 37b of the conducting portion 37a. The reflector 37 is screwed to an external member through the conducting portion 37a and the through hole 37b of the back frame 32, and is electrically connected to this member.

  Even when the conducting portion 37a is formed as described above, the reflector 37 can be easily conducted to the outside by providing the back frame 32 and the conducting portion 37a with the through-hole 37b, which is the same as the case shown in FIG. The effect is obtained.

  In FIG. 7, the edge part of the reflector 37 which concerns on other embodiment of this invention is shown. The reflector 37 has a pair of conducting portions 37a extending in substantially L-shape from both ends in the longitudinal direction of the surrounding portion 37d to the outside of the back frame.

  FIG. 8 is an example of an external view of the liquid crystal display device 100 using the reflector 37 shown in FIG. 7, and FIG. 9 is a diagram showing in detail the portion of the conducting portion 37a shown in FIG. The conducting portion 37a is bent along the outer surface of the frame 32, and is further bent along the dotted line shown in FIG. 7 so as to be elastically deformable with respect to an external force from a direction substantially orthogonal to the side wall of the back frame 32. As shown in FIG. 9, it has the elastic part 37c which protruded from the side wall of the back frame.

  Since the conducting portion 37a includes the elastic portion 37c as described above, the reflector 37 and the outside can be electrically connected by pressing the elastic portion 37c against an externally conductive portion. Accordingly, it is possible to prevent the display image from being deteriorated due to noise generated in the reflector 37 without screwing the reflector 37 and the outside.

  The elastic portion 37c shown in FIGS. 7 to 9 is linearly bent so as to protrude in a direction substantially orthogonal to the side wall of the back frame 32, but is bent in a semicircular shape as shown in FIG. Also good. In this case, the same effect as that shown in FIGS. 7 to 9 can be obtained by pressing the elastic portion 37c against the externally conductive portion.

  In the above embodiment, the pair of conducting portions 37 a are formed at both ends of the reflector 37 in the longitudinal direction. However, the conducting portion 37 a may be formed at one end of the reflector 37.

  The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

1 is an external perspective view of a liquid crystal display device according to an embodiment of the present invention. The disassembled perspective view of the liquid crystal display device shown in FIG. Sectional drawing which cut | disconnected the surface light source device of the liquid crystal display device shown in FIG. 2 by AA '. The perspective view which shows the edge part of the reflector in the liquid crystal display device shown in FIG. The perspective view which shows an example of the liquid crystal display device which mounted the reflector shown in FIG. The perspective view which shows the other example of the liquid crystal display device which mounted the reflector shown in FIG. The perspective view which shows the edge part of the reflector of the liquid crystal display device which concerns on other embodiment of this invention. The front view which shows an example of the liquid crystal display device which mounted the reflector shown in FIG. The perspective view which shows the conduction | electrical_connection part in the liquid crystal display device shown in FIG. The perspective view which shows the other example of the conduction | electrical_connection part in the liquid crystal display device which mounted the reflector shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Liquid crystal display device, 10 ... Liquid crystal display panel, 12 ... Display part, 14 ... Driver circuit board, 16 ... Printed wiring board, PX ... Display pixel, 20 ... Tape, 30 ... Surface light source device, 32 ... Back frame, 33 DESCRIPTION OF SYMBOLS ... Lamp holder, 34 ... Cold cathode tube, 36 ... Light guide, 37 ... Reflector, 37a ... Conduction part, 37b ... Through-hole, 37c ... Elastic part, 38 ... Reflection sheet, 39 ... Optical sheet,

Claims (4)

A liquid crystal display panel having a display area in which a plurality of pixels are arranged;
A surface light source device for illuminating the liquid crystal display panel from the back;
A back frame that supports the liquid crystal display panel and the surface light source device;
The surface light source device is
A light source;
A light guide that converts the emitted light of the light source into planar light; and
A reflector that reflects the light emitted from the light source toward the light guide,
The liquid crystal display device, wherein the reflector has a conductive portion that projects to the outside of the back frame.   2. The liquid crystal display device according to claim 1, wherein the conductive portion of the reflector has a substantially flat plate shape extending in a direction substantially orthogonal to a side wall of the back frame and has a screw hole. The conductive portion of the reflector is substantially flat and is bent along the outer surface of the back frame.
2. The liquid crystal display device according to claim 1, wherein a through hole for screwing that penetrates the back frame and the conductive portion is formed in a portion where the side wall of the back frame and the conductive portion overlap.   The liquid crystal display device according to claim 1, wherein the conductive portion of the reflector includes an elastic portion that can be elastically deformed by a force applied from a direction substantially orthogonal to a side wall of the back frame.

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