JPH0517623U - Liquid crystal display - Google Patents

Abstract

(57) [Summary] [Structure] A long and narrow drive element is used for the liquid crystal panel, and the drive element is arranged around the liquid crystal panel such that its longitudinal direction is substantially parallel to the sides of the liquid crystal panel. On the back surface of the liquid crystal panel, a substantially flat plate-shaped illuminating device including a light guide plate having a light source on its side surface is arranged. Then, a flange portion that supports the drive board is provided in the frame body that houses the lighting means. [Effect] The drive substrate is on the same plane as the liquid crystal panel and fits in a surface area that is slightly larger than the liquid crystal panel, and is supported by a frame from the back surface. Since the both can be held at extremely narrow intervals such that the elastic body is sandwiched, the display device is robust and thin.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a liquid crystal display device having a driving substrate and a lighting unit.

[0002]

[Prior Art]

 Conventionally, for a liquid crystal display device, a drive substrate made of a flexible film having a substantially cubic drive element as shown in Japanese Patent Application Laid-Open No. 2-891 is arranged around a liquid crystal panel. As disclosed in Japanese Laid-Open Patent Publication No. 59525, a liquid crystal panel is laminated with a substantially flat plate-shaped illumination means. The drive substrate is arranged to be bent substantially at right angles to the display surface in order to reduce the surface area of the display device, while the illuminating means is a transparent light guide plate with a linear light source arranged on the side surface, so that the thickness can be reduced. A frame is used to keep the LCD panel integrated with the LCD panel and to prevent dust from entering the LCD panel during lighting and reduce the display quality. It is common to arrange the liquid crystal panel and the lighting means on both sides of the frame body.

[0003]

[Problems to be solved by the device]

 However, since the drive element of the drive board is unstable in support, it is easily damaged by an external impact, and since the drive board itself has an extremely large number of wiring patterns, the wiring may be cut at the bent part. However, it is inconvenient because the contact resistance increases or peels off at the joint with the liquid crystal panel due to the restoring force of the bent portion. The distance between the liquid crystal panel and the lighting means may be extremely thin, but the frame for holding both is thick because of the need to be robust.

[0004]

[Means for Solving the Problems]

 The present invention has been made in consideration of the above points, and uses a long and slender driving element, and arranges it around the liquid crystal panel so that its longitudinal direction is substantially parallel to the side of the liquid crystal panel. A flange portion for supporting the drive substrate is provided on a frame body which houses a substantially flat plate-shaped illuminating means arranged on the back surface of the.

[0005]

[Action]

 As a result, the drive substrate is on the same plane as the liquid crystal panel and fits in a surface area that is slightly larger than the liquid crystal panel, and is supported by the frame body from the back surface. Both can be held at an extremely narrow interval that sandwiches the elastic body.

[0006]

【Example】

 FIG. 1 is a side view of a liquid crystal display device according to an embodiment of the present invention, and FIG. 2 is a plan view of essential parts. In these figures, reference numeral 1 denotes a liquid crystal panel for performing dot matrix display, which is, for example, a field effect type super twist nematic display panel having 640 × 580 pixels.

Reference numeral 2 denotes a driving substrate arranged in the periphery of the liquid crystal panel, in which a driving element 22 having a substantially rectangular parallelepiped shape is arranged at substantially the center of a flexible film 21 such as a polyimide having a fine pattern. The output to the liquid crystal panel is concentrated on one side in the longitudinal direction or short sides on both sides of the side, and the side connecting the drive substrate of the liquid crystal panel 1 and the longitudinal direction of the drive element 22 are arranged substantially parallel to each other. .. The terminal portion of the drive substrate 2 is fixed to the liquid crystal panel 1 with an anisotropic conductive film or fine particle solder. By using the driving element having a substantially rectangular parallelepiped shape in this manner, the distance between the driving element and the terminal portion can be shortened, and the width of the driving substrate is 30 to 70% narrower than that in the case of using a conventional substantially cubic driving element. For example, if the liquid crystal panel has a surface area of 250 × 150 mm, the surface area is about 260 × 170 mm. A plurality of drive substrates 2 are used as needed, and these are connected to each other by a connection substrate 3 such as a printed wiring line. A thick resin substrate is used as the connection substrate 3 or a liquid crystal panel It is more preferable to dispose a hard plate having a narrow width substantially equal to the side length on the back surface of the drive substrate 2.

Reference numeral 4 denotes a substantially flat plate-shaped illuminating device arranged on the back surface of the liquid crystal panel, which is a transparent light guide plate 41 made of acrylic resin or the like, on which a linear light source made of cold cathode rays is arranged on the side surface. Accordingly, the linear light source may be covered with a reflection sheet, or a light diffusion sheet may be attached to the front surface of the light guide plate and a reflection sheet may be attached to the back surface. It is more preferable that a thin spacer 5 made of an elastic material such as silicon rubber is arranged between the light guide plate 41 of the illuminating means 4 and the liquid crystal panel 1. Such a spacer 5 can have a thickness of 1/2 to 1/10 of the conventional frame-shaped frame body, and can support both panels without warping or sticking to each other.

Reference numeral 6 denotes a substantially dish-shaped frame body made of a metal-molded plate or the like, which houses at least the light guide plate 41 of the lighting means 4, and a flange portion 61 for supporting the drive substrate 2 is provided in the peripheral portion. The drive substrate 2 is arranged on the substrate 61 via a connection substrate. When one side of the side surface of the frame 6 is open, the linear light source of the illumination means may be arranged in the open portion.

[0010]

[Effect of the device]

 Since the present invention has the above-described structure, the drive substrate is substantially flush with the liquid crystal panel and fits in a surface area that is slightly larger than the liquid crystal panel, and is supported from the back side by the collar portion of the frame body, and Both of the illuminating means can be held at extremely narrow intervals, and the illuminating means is housed in the frame, so that the display device is robust and thin.

[Brief description of drawings]

FIG. 1 is a side sectional view of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a plan view of a main part of a liquid crystal display device according to an embodiment of the present invention.

[Explanation of symbols]

 1 Liquid crystal panel 2 Drive board 3 Connection board 4 Illumination means 6 Frame

Claims (1)

[Scope of utility model registration request] 1. A liquid crystal panel, a drive substrate having a drive element arranged in the periphery of the liquid crystal panel and having a substantially rectangular parallelepiped shape, the longitudinal direction of which is disposed substantially parallel to the sides of the liquid crystal panel, and the drive substrate disposed on the back surface of the liquid crystal panel. A liquid crystal display device comprising: a substantially flat plate-shaped illuminating means; and a frame body having a flange portion that houses the illuminating means and supports a drive substrate.