JP2000180851A - Construction of backlight liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize, to make light in weight and to make inexpensive a backlight liquid crystal display device 1 formed by superposing a front transparent substrate and a rear transparent substrate and enclosing a liquid crystal in between and by arranging a light source on the rear side. SOLUTION: On a front transparent substrate 2 out of both transparent substrates 2, 3 in the liquid crystal display element 1, a swelled out part 4 from the side face of the rear transparent substrate 3 is integrally provided. By mounting a light emitting diode 6 as a light source on the rear side of the swelled out part 4 so as to make a light beam from the light emitting diode go toward the inside of the rear transparent substrate 3, the rear transparent substrate 3 is made to be a backlight light source which as a whole shines as a plane, and besides, the light beam from the light emitting diode 6 is magnified by a lens body 11 so as to eliminate backlight unevenness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art As is well known, a backlight type liquid crystal display device using a light emitting diode as a light source is a conventional transparent liquid crystal display device in which a reflection plate is adhered to the back side of a liquid crystal display element. By disposing a light plate, by providing at least one light source such as a light emitting diode on at least one of the side surfaces around the light guide plate, so that light from the light source is directed toward the inside of the light guide plate. The light guide plate is configured to be a backlight light source that illuminates the surface in a planar shape.

[0003]

However, in this conventional backlight type liquid crystal display device, a light guide plate provided with a light source such as a light emitting diode is disposed on the back side of the liquid crystal display element. In addition to the overall thickness being increased by the provision of the light guide plate on the back surface side of the liquid crystal display element, in addition to the fact that both the liquid crystal display element and the light source such as the light emitting diode in the light guide plate provide an electrical connection to the outside. Liquid crystal display device as a whole becomes considerably large,
In addition to the increase in weight, there is a problem that the price increases due to the increase in the number of parts.

Moreover, in order to eliminate the unevenness of the backlight in the light guide plate, the number of light sources such as the light emitting diodes must be increased, so that not only the price is further increased but also the power consumption is increased. There was also. An object of the present invention is to provide a structure of a backlight type liquid crystal display device which solves these problems.

[0005]

In order to achieve this technical object, the present invention provides a liquid crystal display device comprising two transparent substrates which are overlapped so as to enclose a liquid crystal therebetween. Of the two transparent substrates in the front transparent substrate on the display surface side, the two transparent substrates are integrally provided with an outwardly protruding portion from the side surface of the rear transparent substrate on the side opposite to the display surface of the two transparent substrates. A light source such as a light emitting diode is mounted on the rear surface of the protruding portion so that light from the light source is directed toward the inside of the rear transparent substrate, and a portion between the light source and the rear transparent substrate is provided with a light source from the light source. A lens body for spreading the light in the horizontal direction is provided. "

[0006]

In this configuration, light emitted from a light source such as a light emitting diode into the inside of the rear transparent substrate of the liquid crystal display element alternates between the front surface and the back surface of the rear transparent substrate. Since the entire rear transparent substrate shines in a plane like the conventional light guide plate, the rear transparent substrate itself in the liquid crystal display element is a backlight light source. It works.

In this case, since the light from the light source such as the light emitting diode can be spread in the lateral direction by the lens body, the unevenness of the backlight light can be eliminated with a small number of light sources. Therefore, according to the present invention, the thickness of the backlight type liquid crystal display device can be reduced, and the number of components can be reduced. Therefore, a significant reduction in size and weight, a reduction in cost, and a reduction in power consumption can be achieved. Has an effect.

In particular, as described in claim 2, a transparent plate having a window hole into which a light source such as the light emitting diode is fitted is mounted on the back surface of the protruding portion, and the lens body is mounted on the transparent plate. By integrally providing the light source, the light source can be protected by the transparent plate integrally provided with the lens body, and the configuration of providing the lens body with respect to the light source can be extremely simplified.

According to the third aspect of the present invention, the driving IC chip can be simultaneously protected by the transparent plate.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In this figure, reference numeral 1 indicates a liquid crystal display element, and this liquid crystal display element 1
The front transparent substrate 2 on the front side and the rear transparent substrate 3 on the rear side are overlapped so as to fill a liquid crystal therebetween. The front transparent substrate 2 of the liquid crystal display element 1 is integrally formed with a protruding portion 4 that protrudes outward from the side surface of the rear transparent substrate 3. I have.

On the back surface of the protruding portion 4 of the front transparent substrate 2, a driving I
In addition to mounting the C chip 5, the light emitting diodes 5, which are one example of a light source, are arranged so that light from each of the light emitting diodes 6 is directed toward the inside of the rear transparent substrate 3 in the liquid crystal display element 1. A plurality of lead terminals 7 for connection to the outside are fixed to the protruding portion 4 by soldering or the like.

Further, a transparent plate 8 having window holes 9 and 10 in which the IC chip 5 and the respective light emitting diodes 6 are fitted is mounted on the back surface of the protruding portion 4 of the front transparent substrate 2. The portion between each of the light emitting diodes 6 and the rear transparent substrate 3 of the liquid crystal display element 1 is formed as a lens body 11 that spreads the light from each of the light emitting diodes 6 in the horizontal direction.

In the liquid crystal display element 1, a light-transmitting polarizing plate 12 is adhered to the front surface of the front transparent substrate 2, and a light-shielding reflecting plate 13 is adhered to the rear surface of the rear transparent substrate 3. I have. Although not shown, connection electrode terminals 14 to which the respective lead terminals 7 are soldered are formed on the back surface of the protruding portion 4 of the front transparent substrate 2, and the connection electrode terminals 14 on both transparent substrates 2 and 3 are formed. To electrically connect between each transparent electrode and the IC chip 5, between the IC chip 5 and the connection electrode terminal 14, and between each of the light emitting diodes 6 and the connection electrode terminal 14, etc. Wiring pattern is formed.

In this configuration, light emitted from each light emitting diode 6 into the rear transparent substrate 3 of the liquid crystal display element 1 refracts the inside of the rear transparent substrate 3 alternately between the front surface and the back surface. By proceeding while the rear transparent substrate 3 is entirely illuminated in a plane, the rear transparent substrate 3 functions as a backlight light source. In this case, a lens body 11 is provided between the respective light emitting diodes 6 and the rear transparent substrate 3 so that light from the respective light emitting diodes 6 can be transmitted to the lens body 1.
1, the light can be spread in the horizontal direction, and the unevenness of the backlight can be eliminated with a small number of light emitting diodes.

The light emitting diodes 6 and the driving IC chip 5 are securely held by the transparent body 8 by being fitted in the window holes 10 and 9 provided in the transparent plate 8. . Instead of fixing the lead terminals 7 to the connection electrode terminals 14 formed on the protruding portion 4, a flat flexible cable to the outside may be connected to each connection electrode terminal 14. Needless to say.

Further, the present invention is not limited to the use of the light emitting diode as the light source of the backlight as described above, and the diameter may be substantially equal to the thickness of the rear transparent plate 3.
Or smaller cylindrical or spherical lamps can be used.

[Brief description of the drawings]

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

FIG. 2 is a perspective view when the liquid crystal display device according to the embodiment of the present invention is viewed from the front side.

FIG. 3 is an enlarged perspective view of the liquid crystal display device according to the embodiment of the present invention when viewed from the back surface side.

FIG. 4 is an enlarged exploded perspective view of the liquid crystal display device according to the embodiment of the present invention when viewed from the back surface side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display element 2 Front transparent substrate 3 Rear transparent substrate 4 Protruding part 5 Driving IC chip 6 Light emitting diode 7 Lead terminal 8 Transparent plate 11 Lens body

Claims (3)

[Claims] 1. A liquid crystal display device comprising two transparent substrates stacked so as to enclose a liquid crystal therebetween, wherein a front transparent substrate on a display surface side of the two transparent substrates in the liquid crystal display device is provided with: Of the two transparent substrates, a protruding portion extending outward from the side surface of the rear transparent substrate opposite to the display surface is integrally provided, and a light source such as a light emitting diode is provided on the back surface of the protruding portion. Along with mounting the light toward the inside of the rear transparent substrate,
A structure of a backlight type liquid crystal display device, wherein a lens body for spreading light from the light source in a horizontal direction is provided between the light source and the rear transparent substrate. 2. The method according to claim 1, wherein a transparent plate having a window hole in which the light source fits is mounted on a back surface of the protruding portion, and the lens body is integrally provided on the transparent plate. Characteristic structure of backlight type liquid crystal display device. 3. The method according to claim 2, wherein:
A structure of a backlight type liquid crystal display device, wherein the driving IC chip mounted on the protruding portion is protected.