JPH10319394A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device capable of displaying even in a bright place under sunlight, etc., in the field and in the place under weak external light. SOLUTION: A liquid crystal display element 1 is placed on a casing 5, and is supported by fixing spacers 7a, 7b to be fixed between the casing 5 and a cover substrate 6. Then, the casing 5 is constituted of a recessed part surface 53 forming a prescribed smooth curved surface shape so that the surface opposite to the liquid crystal display element 1 is parted largely from the liquid crystal display element 1 in the end part side 52a having a backlight 2, and on the other hand, is closed to the liquid crystal display element 1 in the end part side 52b of its opposite side, and is constituted so that a reflection plate 3 is provided on this recessed part surface 53, and further, a deflection plate 4 is provided on its reflection plate 3. The reflection plate 3 is formed with ruggedness performed with non-glare processing by chemicals and irregularly reflecting light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a PT (Program
The present invention relates to a liquid crystal display device used as an information display device such as a rminal).

[0002]

2. Description of the Related Art As shown in FIG. 5, a liquid crystal display device has deflecting plates 4a, 4b or a reflecting plate 3 on its surface, and transparent electrodes 10a, 10b and alignment films 11a, 11 on its inner surface.
Upper and lower glass substrates (or films) 1 on which b is formed
Spacer 13 is arranged between 2a and 12b to seal material 15
The liquid crystal display element 1 in which the liquid crystal 14 is sealed by a and 15b is mounted on the housing 5, and is fixed to the cover substrate 6 and the housing 5 by fixing spacers 7a and 7b.

The liquid crystal display device having such a configuration is roughly classified into a transmission mode device and a reflection mode device depending on how light emitted from a light source passes.

Here, in the transmission mode, a backlight is provided on the back surface of the liquid crystal display element, and the light of the backlight is transmitted or shielded by the liquid crystal display element 1 for display.

[0005] In the reflection mode, display is performed by transmitting or blocking external light (including light from the surface of the liquid crystal display element) and light reflected by the reflector by the liquid crystal display element 1. is there.

[0006]

However, the liquid crystal display device of the transmission mode has good visibility indoors and the like, but the light of the backlight loses to the external light in a bright place such as outdoor sunlight. And the display becomes invisible.

Further, in the reflection mode type liquid crystal display device, although the display has good visibility under strong external light, the reflected light is weak in a place where the external light is weak (dark place), so that the display becomes invisible. There was a point.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a liquid crystal display device which can display even in a bright place such as outdoors under sunlight or a place where external light is weak.

[0009]

In order to achieve the above-mentioned object, according to the present invention, there is provided a liquid crystal display element, a reflection plate provided separately from the liquid crystal display element, and the liquid crystal display element. And a backlight provided below one end of the liquid crystal display device, wherein the reflector is largely separated from the liquid crystal display element on the backlight side disposed below one end of the liquid crystal display element. On the other end side, a predetermined smooth curved surface shape close to the liquid crystal display element is formed.

[0010] According to a second aspect of the present invention, in the first aspect of the present invention, the reflector has irregularities for irregularly reflecting.

According to a third aspect of the present invention, in the first or the second aspect of the present invention, a diffusion sheet is provided between the liquid crystal display element and the reflector on the front surface of a backlight provided below one end of the liquid crystal display element. Is provided.

According to a fourth aspect of the present invention, in the first to third aspects, a housing for mounting the liquid crystal display element is provided, and the housing is opposed to the liquid crystal display element. The surface has a curved concave surface of the reflector, and the reflector is provided on the concave surface.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, a deflecting plate is provided on the reflecting plate provided on the concave surface of the housing.

In the present invention, the reflection plate is largely separated from the liquid crystal display element on the backlight side disposed below one end of the liquid crystal display element, while the reflection plate is separated from the liquid crystal display element on the opposite end side. The light emitted from the backlight can be uniformly reflected because of the predetermined smooth curved surface shape that is close to the light source.

Further, since the reflection plate has irregularities, incident light is irregularly reflected. For this reason, the irregularly reflected light can blur the shadow of the display image of the liquid crystal display element that is seen when the liquid crystal display element is viewed obliquely.

Furthermore, since a diffusion sheet is provided between the liquid crystal display element and the reflector on the front surface of the backlight provided below one end of the liquid crystal display element, the light of the backlight can be directly seen even when the display device is viewed obliquely. Disappears.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the liquid crystal display device according to the present invention will be described with reference to the drawings.

<First Embodiment> FIG. 1 is a schematic sectional view showing the structure of a first embodiment of the liquid crystal display device according to the present invention.

Here, the same components as those of the above-described conventional liquid crystal display device are denoted by the same reference numerals.

In the liquid crystal display device of this embodiment, the liquid crystal display element 1 is placed on the housing 5 and the fixing spacers 7a, 7
b, and is fixed between the housing 5 and the cover substrate 6.

The surface of the housing 5 facing the liquid crystal display element 1 is largely separated from the liquid crystal display element 1 on the end side 52a having the backlight 2, while the other end side 52b on the opposite side. Has a concave surface 53 having a predetermined smooth curved surface shape close to the liquid crystal display element 1, the reflecting plate 3 is provided on the concave surface 53, and the deflecting plate 4 is provided on the reflecting plate 3. It has a configuration.

The reflection plate 3 is subjected to a non-glare treatment using a chemical agent, so that irregularities for irregularly reflecting incident light are formed.

Since the liquid crystal display element 1 is not a feature of the present invention, a detailed description thereof will be omitted.

In the liquid crystal display device of this embodiment, the end portion 52a having the backlight 2 is largely separated from the liquid crystal display element 1, while the end portion 52b opposite to the end portion 52b has a predetermined position close to the liquid crystal display element 1. Since the reflecting plate 3 is provided on the concave surface 53 having a smooth curved surface,
Since the reflecting plate 3 has a curved shape approaching the liquid crystal display element 1 as it goes away from the backlight 2, the backlight 2
Plate 3 for incident light A and external light B emitted from
The reflected light C reflected by the above can be made uniform.

Therefore, the back surface of the liquid crystal display element 1 can be illuminated with uniform reflected light, and a display screen with good visibility can be provided even in a bright place such as outdoors under sunlight or a place where external light is weak. Obtainable.

Further, in the liquid crystal display device of this embodiment,
Since the reflection plate 3 is subjected to the non-glare treatment to form the unevenness, the incident light A and the external light B emitted from the backlight 2 are irregularly reflected, which occurs when the liquid crystal display element 1 is viewed obliquely. Thus, the shadow of the image displayed on the liquid crystal display element 1 can be blurred.

<Second Embodiment> FIG. 2 is a schematic sectional view showing the structure of a liquid crystal display device according to a second embodiment of the present invention.

Here, like the first embodiment, the same components as those of the above-mentioned conventional liquid crystal display device are denoted by the same reference numerals.

In the liquid crystal display device of this embodiment, the liquid crystal display element 1 is mounted on the housing 5 and the fixing spacers 7a, 7
b, and is fixed between the housing 5 and the cover substrate 6.

The surface of the housing 5 facing the liquid crystal display element 1 is largely separated from the liquid crystal display element 1 on the end side 52a having the backlight 2, while the opposite end side 52b is provided. Has a concave surface 53 having a predetermined smooth curved shape close to the liquid crystal display element 1, and the concave surface 53 is provided with the reflection plate 3.

The reflection plate 3 is subjected to a non-glare treatment using a chemical agent, so that irregularities for irregular reflection are formed.

The liquid crystal display device of this embodiment is configured such that the diffusion sheet 8 is provided in front of the backlight 2 provided on one end side of the concave surface 53 so as to partition the concave surface 53. .

The liquid crystal display element 1 is provided with a deflecting plate 4 on the surface facing the housing 5, but it is not a feature of the present invention, so that the detailed description is omitted.

In the liquid crystal display device of this embodiment, as in the case of the first embodiment, the reflector 3 provided on the concave surface 43 of the housing 5 is closer to the liquid crystal display element 1 as the distance from the backlight 2 increases. Since it has a sloping curved shape, a reflector 3 for incident light emitted from the backlight 2 and incident light of external light
Reflected light uniformly illuminates the back surface of the liquid crystal display element 1, and a display screen with good visibility can be obtained even in a bright place such as outdoors under sunlight or a place where external light is weak. .

In the liquid crystal display of this embodiment,
Since the reflection plate 3 is subjected to the non-glare treatment to form the unevenness, the incident light A and the external light B emitted from the backlight 2 are irregularly reflected, which occurs when the liquid crystal display element 1 is viewed obliquely. The shadow of the display image of the liquid crystal display element 1 is
The irregularly reflected light can be blurred.

Further, in the liquid crystal display device of this embodiment, the backlight 2 provided on one end side of the concave surface 53 is provided.
2, the diffusion sheet 8 is provided so as to partition the concave surface 53. Therefore, as shown in FIG. 2, even when the diffusion sheet 8 is viewed obliquely from the liquid crystal display element 1 toward the backlight 2, the diffusion sheet 8 The light emitted from the light 2 is diffused to make the backlight light invisible directly.

Therefore, a part of the display does not become too bright, and a display screen with good visibility can be obtained from any direction.

<Third Embodiment> FIG. 3 is a schematic sectional view showing the structure of a liquid crystal display device according to a third embodiment of the present invention.

Here, like the first or second embodiment, the same components as those of the above-mentioned conventional liquid crystal display device are denoted by the same reference numerals.

The liquid crystal display of this embodiment has the same structure as the liquid crystal display of the first embodiment, and further includes, before the backlight 2 provided at one end of the concave surface 53,
The diffusion sheet 8 is provided so as to partition the concave surface 53.

Accordingly, the liquid crystal display device of this embodiment has the above-mentioned effects of the liquid crystal display device of the first embodiment, and furthermore, even when the liquid crystal display device 1 is viewed obliquely toward the backlight 2. The diffusion sheet 8 has the effect of diffusing the light emitted from the backlight 2 and making the backlight light invisible directly.

Therefore, a part of the display does not become too bright, and a display screen with good visibility can be obtained from any direction.

<Fourth Embodiment> FIG. 4 is a schematic sectional view showing the structure of a fourth embodiment of the liquid crystal display device according to the present invention.

Here, like the first to third embodiments, the same components as those of the above-mentioned conventional liquid crystal display device are denoted by the same reference numerals.

The liquid crystal display device of this embodiment has a configuration in which the diffusion sheet 8 in the configuration of the liquid crystal display device of the second embodiment is not provided.

Therefore, in the liquid crystal display device of this embodiment, of the effects of the liquid crystal display device of the second embodiment,
The effect as described above due to the provision of the diffusion sheet does not exist.

[0047]

As described above, according to the present invention, the reflection plate is largely separated from the liquid crystal display element on the backlight side disposed below one end of the liquid crystal display element, while the reflection plate is separated from the liquid crystal display element on the opposite end side. The light emitted from the backlight can be uniformly reflected because of the predetermined smooth curved surface shape that is close to.

Therefore, a display screen having good visibility can be obtained even in a bright place such as outdoors under sunlight or a place where external light is weak.

Further, since irregularities are formed on the reflection plate, incident light is irregularly reflected, and the irregularly reflected light can blur the shadow of the image of the liquid crystal display element generated when the liquid crystal display element is viewed from an oblique direction. Thus, a display screen with better visibility can be obtained.

Further, since a diffusion sheet is provided between the liquid crystal display element and the reflection plate in front of the backlight provided below one end of the liquid crystal display element, the light of the backlight can be directly seen even when the display device is viewed obliquely. Disappears.

Therefore, it is possible to prevent a part of the display from becoming too bright, and to obtain a display screen with even better visibility.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing the configuration of a first embodiment of a liquid crystal display device according to the present invention.

FIG. 2 is a schematic sectional view showing a configuration of a second embodiment of the liquid crystal display device according to the present invention.

FIG. 3 is a schematic sectional view showing the configuration of a third embodiment of the liquid crystal display device according to the present invention.

FIG. 4 is a schematic sectional view showing the configuration of a fourth embodiment of the liquid crystal display device according to the present invention.

FIG. 5 is a schematic sectional view showing the configuration of a conventional liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display element 2 Backlight 3 Reflector 4 Deflector 5 Housing 53 Concave surface 6 Cover substrate 7a, 7b Fixing spacer 8 Diffusion sheet

Claims (5)

[Claims] 1. A liquid crystal display device comprising: a liquid crystal display element; a reflector provided separately from the liquid crystal display element; and a backlight provided below one end of the liquid crystal display element. A plate is largely separated from the liquid crystal display element on the backlight side disposed below one end of the liquid crystal display element, while a predetermined smooth curved surface close to the liquid crystal display element on the opposite end side. A liquid crystal display device having a shape. 2. The liquid crystal display device according to claim 1, wherein the reflector has irregularities for irregularly reflecting the light. 3. The liquid crystal according to claim 1, wherein a diffusion sheet is provided between the liquid crystal display element and the reflector on a front surface of a backlight provided below one end of the liquid crystal display element. Display device. 4. A housing for mounting the liquid crystal display element is provided, the housing having a surface facing the liquid crystal display element having a curved concave surface of the reflection plate. 4. The liquid crystal display device according to claim 1, wherein said reflection plate is provided on the concave surface. 5. A deflecting plate is provided on the reflecting plate provided on a concave surface of the housing.
The liquid crystal display device as described in the above.