JPH10239693A - Liquid crystal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal device which prevents the degradation in the display quality due to stray light. SOLUTION: A transparent protection plate 53 forming a display screen is arranged in the front of a liquid crystal panel P, and a light-transmissive plate 55 through which light from an illuminaire B illuminating the liquid crystal panel P is transmitted is arranged at the rear of the panel P, and first and second elastic members 33A and 35A interposed between the liquid crystal panel P and the protection plate 53 and between the liquid crystal panel P and the light-transmissive plate 55 respectively are made of non-transmissive black materials, thus intercepting stray light from the illuminaire B by first and second elastic members 33A and 35A to prevent it to reach the display screen.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal device,
In particular, the present invention relates to an elastic member interposed between a liquid crystal panel, a protective plate disposed on a front surface of the liquid crystal panel, and a light transmitting plate disposed on a rear surface of the liquid crystal panel.

[0002]

2. Description of the Related Art In a conventional liquid crystal device, a liquid crystal panel, a transparent protective plate disposed on the front surface of the liquid crystal panel, a light transmitting plate disposed on the rear surface of the liquid crystal panel, and a lighting device for illuminating the liquid crystal panel are disclosed. Some have.

FIG. 3 is a diagram showing a schematic configuration of an example of such a liquid crystal device. In FIG.
P is a liquid crystal panel, B is a backlight which illuminates the liquid crystal panel P, 53 is a transparent display plate which is made of chemically strengthened glass and forms a display screen and also serves as a protection plate, and 55 is a liquid crystal which emits light from the backlight B. The back glass is a light-transmitting plate that transmits light through the panel P.

[0004] The liquid crystal panel P has a pair of glass substrates 2 and 3 arranged substantially in parallel as shown in FIG. (Shown). The pair of substrates 2 and 3
A ferroelectric liquid crystal 7 is interposed between the gaps, and polarizing plates 5 and 6 are attached to the outer surfaces of the glass substrates 2 and 3, respectively.

On the other hand, the liquid crystal panel P and the display panel 5 are arranged so as to absorb the shock applied to the liquid crystal panel P and maintain the intervals between the liquid crystal panel P and the display panel 53 and the back glass 55 at predetermined intervals.
3, a first elastic member 33 and a liquid crystal panel P
A second elastic member 35 is interposed between and the back glass 55. In addition, these elastic members 33 and 35
Is the position of the seal portion Ps of the liquid crystal panel P. The rubber hardness of these elastic members 33 and 35 is
The angle is set to 20 degrees or less. For example, a white silicone foam sponge having a rubber hardness of 8 degrees is used.

[0006]

In such a conventional liquid crystal device, since the elastic members 33 and 35 are white, when the backlight B illuminates the liquid crystal panel P as shown in FIG. The stray light L, which is a part of the light from the backlight B, passes through the back glass 55, enters the second elastic member 35, and then passes through the sealing portion Ps of the liquid crystal panel P, and passes through the first elastic member 33. And the first elastic member 33 emits diffused light.

Here, in this state, when the observer looks into the liquid crystal display surface (display plate 53) at an acute angle as shown in FIG.
The first elastic member 33 that emits diffused light through the display panel 53 is observed from a portion beyond the tip of the parting-off printing section 54. When the stray light L from the first elastic member 33 diffuses and emits light in this manner, there is a problem that a border that emits light in a linear shape is present around the display screen deviating from the display area, making it very difficult to see. .

Accordingly, the present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a liquid crystal device capable of preventing a deterioration in display quality due to stray light. .

[0009]

According to the present invention, there is provided a liquid crystal panel having a liquid crystal sandwiched between a pair of wiring boards, and an illuminating device for illuminating the liquid crystal panel, and a transparent protective plate is provided on a front surface of the liquid crystal panel. In a liquid crystal device in which a light-transmitting plate for transmitting light from the lighting device is disposed at a predetermined interval on the back surface of the liquid crystal panel, the light-transmitting plate is interposed between the liquid crystal panel and the protection plate. A first elastic member, a second elastic member interposed between the liquid crystal panel and the light-transmitting plate, and the first and second elastic members.
Is formed of a non-transmissive black or near black material.

Further, the present invention is characterized in that the liquid crystal is a ferroelectric liquid crystal.

Further, as in the present invention, a transparent protective plate is disposed on the front surface of the liquid crystal panel, and a light transmitting plate for transmitting light from a lighting device for illuminating the liquid crystal panel is disposed on the rear surface.
By forming the first and second elastic members interposed between the liquid crystal panel and the protective plate and between the liquid crystal panel and the translucent plate with a non-transmissive black or nearly black material, The first and second elastic members shield the stray light from the lighting device from reaching the display screen.

[0012]

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

FIG. 1 is a schematic configuration diagram of a liquid crystal device according to an embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 3 indicate the same or corresponding parts.

In FIG. 1, reference numerals 51 and 52 denote liquid crystal devices 50.
Are formed as a pair of outer cases, and the pair of outer cases 51 and 52 are configured to be detachable.

Here, the pair of outer cases 51, 52
An opening 51a is formed on the upper surface of the upper outer case 51, and a display plate 53 is attached to a receiving portion 51b provided at an edge of the opening 51a. The display plate 53 is fixed with a double-sided adhesive tape or the like (not shown), and the surface of the display plate 53 (the surface on the observer side) is subjected to an anti-glare treatment.

The lower outer case 52 has a back glass 55 attached to the upper surface and an upper plate 52 having an opening 52a for irradiating the liquid crystal panel P with light from the backlight B through the back glass 55. It has a portion 52b.
The fixing of the back glass 55 is performed by a double-sided adhesive tape or the like (not shown).

The display case 53 and the back glass 55 are arranged at a predetermined distance by fitting the outer cases 51 and 52 together. A rib 52c is formed on the upper surface of the upper plate portion 52b, and a circuit board 10 for driving the liquid crystal panel P is attached to the rib 52c.

On the other hand, in the figure, reference numeral 33A denotes a sealing portion Ps of the liquid crystal panel P between the liquid crystal panel P and the display panel 53.
A first elastic member 35A disposed directly above is a sealing portion Ps of the liquid crystal panel P between the liquid crystal panel P and the back glass 55.
It is a second elastic member interposed immediately below. Here, the first and second elastic members 33A and 35A have a rubber hardness of 20.
The temperature is set to be equal to or less than the degree, and a non-transmissive black or nearly black material, for example, a black urethane foam sponge is used.

By forming the first and second elastic members 33A, 35A with a non-permeable black urethane foam sponge, stray light L from the backlight B can be blocked, and stray light can be blocked. L is prevented from being guided to the periphery of the liquid crystal screen.

Next, the stray light blocking operation in the liquid crystal device thus configured will be described.

When the liquid crystal panel P is illuminated by the backlight B, stray light L from the backlight B is generated as shown in FIG.
It passes through the back glass 55 and enters the second elastic member 35A.
However, the stray light L is blocked by the black second elastic member 35A. Note that even if all the stray light L cannot be blocked by the second elastic member 35A, the stray light L transmitted through the second elastic member 35A subsequently passes through the seal portion Ps of the liquid crystal panel P and is not removed from the first elastic member 35A. However, since the first elastic member 33 is also black, it is shielded from light and is not guided to the periphery of the liquid crystal screen.

Thus, the first and second elastic members 33
By forming A and 35A with black urethane foam sponge, stray light from backlight B can be shielded. By blocking stray light in this way, even if the observer looks into the liquid crystal display surface at an acute angle as shown in the figure, the screen does not become difficult to see, and the display quality is improved.

[0023]

As described above, according to the present invention, the elastic members respectively disposed between the liquid crystal panel and the protective plate and between the liquid crystal panel and the translucent plate are made of non-transmissive black or nearly black material. The display quality can be improved by blocking the light from stray light from the lighting device.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a liquid crystal device according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the liquid crystal device.

FIG. 3 is a schematic configuration diagram of a conventional liquid crystal device.

FIG. 4 is an enlarged sectional view of a main part of the conventional liquid crystal device.

[Explanation of symbols]

 33, 33A First elastic member 35, 35A Second elastic member 50 Liquid crystal device 53 Display plate 55 Back glass B Backlight device L Stray light P Liquid crystal panel

Claims (2)

[Claims] A liquid crystal panel sandwiching liquid crystal between a pair of wiring boards; and an illuminating device for illuminating the liquid crystal panel. A transparent protective plate is provided on a front surface of the liquid crystal panel, and a transparent protection plate is provided on a back surface of the liquid crystal panel. In a liquid crystal device in which light-transmitting plates for transmitting light from the lighting device are arranged at predetermined intervals, a first elastic member interposed between the liquid crystal panel and the protection plate; A second elastic member interposed between the liquid crystal panel and the light transmitting plate, and the first and second elastic members are formed of a non-transmissive black or nearly black material. A liquid crystal device characterized by the above-mentioned. 2. The liquid crystal device according to claim 1, wherein the liquid crystal is a ferroelectric liquid crystal.