JPH1172798A - Structure of back light type liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid the increase in the number of labor and the increase in the size in the case a power source is connected to a liquid crystal display device constituted by superposing and fixing a back light plate provided with light sources, such as light emitting diodes, to the rear surface of a liquid crystal display element formed by superposing two sheets of transparent plates by encapsulating liquid crystals therebetween. SOLUTION: Electrodes 10a, 10b for the power source formed in a projecting part 1a' disposed at one transparent plate 1a of both transparent plates of the liquid crystal display element 1 and electrodes 11a, 11b for the power sources formed at the back light plate 7 are electrically connected to each other by connecting pieces 13 interposed between the protruding part 1a' and the back light plate 7, by which the power sources are connected to the back light plate 7 simultaneously with the connection of the power source to the liquid crystal display element 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a so-called backlight type liquid crystal display device in which a light source is provided on the back of a liquid crystal display element.

[0002]

2. Description of the Related Art In general, a backlight type liquid crystal display device of this type constitutes a liquid crystal display device by superposing two transparent plates with liquid crystal sealed between them and superposing the liquid crystal display device on the back surface of the liquid crystal display device. It is well known that a backlight plate provided with a light source such as a light emitting diode and configured to emit light from the entire surface is stacked and fixed (for example, Japanese Utility Model Application Laid-Open No. 4-40272). Etc.).

[0003]

However, in the conventional backlight type liquid crystal display device, the power supply wiring circuit in the backlight plate is configured to be independent of the power supply wiring circuit in the liquid crystal display element. Therefore, the power supply for the backlight plate must be connected completely separately from the power supply for the liquid crystal display element, so that a great deal of trouble is required for the connection, which not only leads to an increase in cost but also to the liquid crystal display. There has been a problem that the entire display device is increased in size and weight.

An object of the present invention is to provide a structure of a backlight type liquid crystal display device which solves this problem.

[0005]

In order to achieve this technical object, the present invention provides a light source, such as a light emitting diode, on the back surface of a liquid crystal display device in which two transparent plates are stacked with liquid crystal sealed between them. In a backlight type liquid crystal display device in which a backlight plate configured to emit light from the surface is overlapped and fixed, in the liquid crystal display element, one of the two transparent plates in the liquid crystal display element from the other transparent plate A protruding portion is provided. The protruding portion is provided with a plurality of external connection terminals electrically connected to each of various signal wiring circuits and a power supply wiring circuit in the liquid crystal display element, and a power supply wiring in the liquid crystal display element. A circuit or a power supply electrode electrically connected to a power supply external connection terminal among the external connection terminals is provided, and the backlight plate is provided with a light source in the backlight plate. A power supply electrode that is electrically conductive is provided so as to face a power supply electrode on one of the transparent plates of the liquid crystal display element, and a protruding portion on one of the transparent plates of the liquid crystal display element and the backlight plate are further provided. And a connection piece for electrically connecting the power supply electrode of the backlight plate to the power supply electrode of the protruding portion of the one transparent plate. "

[0006]

Operation and effect of the present invention
The light source in the backlight plate is connected to the external connection terminal of the liquid crystal display device through a connection piece inserted between the backlight plate and the protruding portion of one of the transparent plates in the liquid crystal display device. Since it is electrically connected to the connection terminal, it is possible to connect a power supply to the liquid crystal display element and also connect a power supply to the backlight plate at the same time.

Therefore, according to the present invention, since it is only necessary to connect a power supply to the liquid crystal display element, the number of steps required to connect the power supply is reduced, the price can be significantly reduced, and the size and weight can be reduced. It has an effect that can be achieved.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 show a first embodiment. In this figure, reference numeral 1 indicates a liquid crystal display element,
This liquid crystal display element 1 is a transparent plate 1 such as two glass plates.
a and 1b are stacked and fixed to each other with a liquid crystal sealed therebetween.

[0009] Both transparent plates 1 in the liquid crystal display element 1
One side of the transparent plate 1a on the display surface side of the transparent plate 1a, 1b is provided with one protruding portion from the other transparent plate 1b.
a 'is provided, and among the front and back surfaces of the protruding portion 1a', on the back surface opposite to the display surface of the liquid crystal display element 1, various signal wiring circuits and power supply wiring circuits of the liquid crystal display element 1 (both are shown in the drawing). (Not shown), and a control IC chip 2 for these various signal wiring circuits and power supply wiring circuits. Also,
A light-shielding film 3 is adhered to the surface of the protruding portion 1a '.

Further, a plurality of lead pins 5a, 5b, 5c as one embodiment as a plurality of external connection terminals, and a plurality of lead pins 5a, 5b are provided on one edge of the one transparent plate 1a. 6 with built-in, 5c
Are two of the lead pins 5a,
5b is mounted on the power supply wiring circuit so that the remaining plural lead pins 5c are electrically connected to each of the various signal wiring circuits.

Reference numeral 7 denotes a backlight plate made of a transparent synthetic resin which is disposed so as to overlap the rear surface of the liquid crystal display element 1. The backlight plate 7 includes a plurality of backlight plates inside right and left ends. A light-emitting diode 8 is provided to emit light from the entire surface of the backlight plate 7, and a light diffusion plate 9 is attached to the surface of the backlight plate 7.

Two power supply electrodes 10a and 10b are provided on the back surface of the protruding portion 1a 'of one of the transparent plates 1a of the liquid crystal display element 1 with two power supply lead pins 5a and 5b of the connector 6 respectively. It is formed so as to be electrically conductive (note that the power supply electrodes 10a and 10b are used).
May be electrically connected to the power supply wiring circuit formed on the back surface of the protruding portion 1a ').

On the other hand, on the surface of the backlight plate 7,
Two power supply electrodes 11a and 11b for each light emitting diode 8 in the backlight plate 7 are formed at a portion of the liquid crystal display element 1 facing the power supply electrodes 10a and 10b. Then, a backlight plate 7 is provided on the back surface of the liquid crystal display element 1, and a diffusion plate 9 on the surface thereof.
After being overlapped so as to be in close contact with each other, a clip body 12 is formed on each of the left and right ends thereof in a U-shape in a cross section sideways.
The backlight plate 7 is fixed to the liquid crystal display element 1 by fitting the liquid crystal display element 1.
By sandwiching a connection piece 13 made of a soft elastic material between a ′ and the backlight plate 7, a liquid crystal display is formed via two conductor films 13 a and 13 b formed on the surface of the connection piece 13. Dual power electrodes 10a and 10b in the element 1;
The power supply electrodes 11a and 11b of the backlight plate 7 are electrically connected to each other.

With this configuration, each light emitting diode 8 as a light source in the backlight plate 7 is
A plurality of lead pins 5a, 5b, 5c of the liquid crystal display element 1 are connected via connecting pieces 13 inserted between the backlight plate 7 and the protruding portion 1a 'of one of the transparent plates 1a of the liquid crystal display element 1. Of these, since it can be electrically connected to the two power supply lead pins 5a and 5b,
By connecting an external connection cable (not shown) to the connector 6 having the plurality of lead pins 5a, 5b, 5c, the power supply wiring of the connection cable is changed to the liquid crystal display element 1. Power can be connected to both the backlight plate 7 and the backlight plate 7 at the same time.

Next, FIG. 8 shows a second embodiment. In the second embodiment, when the liquid crystal display element 1 and the backlight plate 7 are fixed to each other, instead of using a pair of left and right clip bodies 12 as in the first embodiment, the transparent composite is used. A plurality of nail pieces 7a are integrally provided around a resin backlight plate 7, and inside the nail pieces 7a,
The configuration is such that the liquid crystal display element 1 and the backlight plate 7 are fixed by pressing the liquid crystal display element 1, and the other configuration is the same as that of the first embodiment.

According to the second embodiment, the use of the clip body 12 for fixing the liquid crystal display element 1 to the backlight plate 7 as in the first embodiment can be omitted, so that the number of parts can be reduced. Thus, there is an advantage that the price can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of the present invention.

FIG. 2 is a perspective view of the liquid crystal display element as viewed from the back.

FIG. 3 is a sectional view taken along line III-III of FIG.

FIG. 4 is a sectional view taken along line IV-IV of FIG.

FIG. 5 is a sectional view taken along line VV of FIG. 1;

FIG. 6 is a perspective view showing an assembled state according to the first embodiment of the present invention.

FIG. 7 is a sectional view taken along the line VII-VII in FIG. 6;

FIG. 8 is an exploded perspective view showing a second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Liquid crystal display element 1a One transparent plate 1a 'Protruding part 1b The other transparent plate 5a, 5b, 5c Lead pin as an external connection terminal 6 Connector 7 Backlight plate 8 Light emitting diode as a light source 9 Light diffusion plate 10a, 10b Power supply Electrode 11a, 11b Power electrode 13 Connection piece

Claims (1)

[Claims] 1. A back light plate having a light source such as a light emitting diode and emitting light from the front surface is provided on the back surface of a liquid crystal display element in which two transparent plates are stacked with liquid crystal sealed therebetween. In a backlight type liquid crystal display device fixed in an overlapping manner, one of the two transparent plates in the liquid crystal display element is provided with a protruding portion from the other transparent plate, and in the protruding portion, various signals in the liquid crystal display element are provided. A plurality of external connection terminals electrically connected to each of the wiring circuit for power supply and the wiring circuit for power supply; While the power supply electrode that is electrically conductive is provided, the backlight plate is provided with a power supply electrode that is electrically conductive to a light source in the backlight plate, and one of the liquid crystal display elements. A power supply electrode on the transparent plate is provided so as to face the power supply electrode on the transparent plate, and a power supply electrode on the backlight plate is provided between the protruding portion of the one transparent plate of the liquid crystal display element and the backlight plate. A structure of a backlight type liquid crystal display device, characterized in that a connection piece electrically connected to a power supply electrode of a protruding portion of a plate is interposed.