JPS60100170A - Liquid crystal display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a liquid crystal display device used in, for example, an electronic instrument panel of a self-help type.

[Background of the invention]

Recently, the instrument panels of self-help models have become electronic, and liquid crystal instrument panels have become commercially available. Moreover, in order to increase the space behind the self-help instrument panel, there is a current demand for a Ti-type liquid crystal instrument panel.

An example of a means for implementing the above-mentioned thinning is Japanese Patent Application Laid-open No. 57-144.
It is disclosed in Japanese Patent No. 580. This will be explained with reference to FIG. In the IC shown in the figure, 1 is a liquid crystal display element, 1a is a front polarizing plate, 1b is a rear polarizing plate, and lc is a reflective plate.These parts 1.1a to IC constitute a reflective liquid crystal display module 1o. has been done. Reference numeral 2 denotes a drive circuit board having a drive circuit 2a, 3 an interconnector interposed between the liquid crystal display element 1 and the drive circuit board 2, 4 a case, and 5 a 7-hire connector installed in the case 4 by bolts 7. The drive circuit board 2 is also attached to the case 4 by the port 7 in the light guide panel. 8 is a light source provided inside the case 4.

As described above, the conventional liquid crystal display device has a structure in which the case 4, light guide panel 5, liquid crystal display module 10, interconnector 3, and drive circuit board 2 are stacked and bonded together. There are limits to compactness, and the current situation is that it is far from meeting requests. Also,
Since the interconnector 3 is made of conductive rubber, it may be deformed due to poor contact at its contact portion.

[Object of the Invention] It is an object of the present invention to eliminate the above-mentioned conventional drawbacks and to improve economical efficiency and ease of assembly by reducing the number of parts.

[Summary of the invention]

In order to achieve the above object, the present invention provides a liquid crystal display device in which a liquid crystal unit, a printed circuit board, a conductive member, a light guide member, and a light source are housed in a case, in which the liquid crystal unit is molded with a conductive member, and the liquid crystal unit is molded with a conductive member. The present invention is characterized in that the light guide member also serves as a case, and a part of the light guide member is interposed between the liquid crystal unit and the printed circuit board.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 11 denotes a known liquid crystal unit constructed in the form of a flat plate, and this liquid crystal unit 11 is molded in advance with a conductive member 14, such as conductive rubber, attached to a printed circuit board 12. 13 is a display circuit for the liquid crystal unit 11 attached to the printed circuit board 12.

Reference numeral 15 denotes a light guiding portion which also serves as a case, and a portion 15a thereof is interposed between the liquid crystal unit 11 and the printed circuit board 12. Reference numerals 16 and 17 denote a connector and a lamp attached to the printed circuit board 12, and this lamp 17 illuminates through the light guide portion 15 at night.

Reference numerals 18 and 19 denote an upper lid and a lower lid attached to the upper and lower parts of the light guide member 15, respectively, and the upper lid 18 is made of an acrylic plate to improve water resistance.

The liquid crystal unit 11 is crimped by the light guide member 15 or by melting and pressurizing a part of the liquid crystal unit 11.
It may also be connected to the electrical member 14 and fixed to the printed circuit board 12.

Since the present embodiment is configured as described above, the number of parts can be reduced to reduce costs and make the entire device thinner and lighter. Also, a portion 15a of the light guide member
It is possible to further improve the reflectivity by coating the lower surface of the board, that is, the surface facing the printed circuit board 12, with reflective barbs.

FIG. 3 shows another embodiment of the present invention, and the same reference numerals as those shown in FIG. 2 behind the reference numerals in this figure indicate the same dimensions or corresponding parts.

This embodiment differs from the above embodiment (FIG. 2) in that the light guide member 15 also serves as the substrate phase of a printed circuit board, and a pattern is printed on a part 15a of the light guide section 015. Since the structure of is the same, the explanation will be omitted. With this configuration, you can eliminate the printed circuit board and further reduce the number of parts in the structure. IN can be simplified.

〔Effect of the invention〕

As explained above, according to the present invention, by allowing the light guide to also serve as a case, it is possible to achieve a reduction in thickness and weight, making it ideal for installation in the limited space of automobiles. .

In addition, by using the printed circuit board as the light guide member, the number of parts can be further reduced.
Not only economical efficiency can be improved, but also ease of assembly can be improved.

[Brief explanation of the drawing]

FIG. 1 shows a conventional liquid crystal display device 6. FIGS. 2 and 3 are cross-sectional views showing valley embodiments of the liquid crystal display device of the present invention. 11...Liquid crystal unit, 12...Printed circuit board, 1
4...4 electric member, 15...light guide member, 15a...
A part of the light guide member. Agent Patent Attorney Masami Akimoto-10

Claims (1)

[Scope of Claims] 1. A liquid crystal unit 7 configured in a planar shape, a printed circuit board having a display circuit of this liquid crystal unit, a conductive member electrically connecting this printed circuit board and the liquid crystal unit, and a light source. In a liquid crystal display device consisting of a light guide member that transmits light beams and a case that houses these parts, the liquid crystal unit is molded with a conductive member, and the light guide member also serves as the case. A liquid crystal display device characterized in that a part of a light member is interposed between the liquid crystal unit and a printed circuit board. 2. The liquid crystal display device according to claim 1, wherein the conductive member is embedded in and penetrates the light guide member. 3. The light guide member also serves as a substrate material of a printed circuit board,
3. The liquid crystal display device according to claim 1, wherein a pattern is printed on the light guide member. 4. The liquid crystal display device according to any one of claims 1 to 3, wherein a reflective paint is applied to the surface of the light guiding member on the printed circuit board side.