JPH0527227A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To improve the characteristics of a visual field by providing a liquid crystal display element and an image transmitting element disposed on the exit light side of the liquid crystal display element, and adopting a constitution so as to view the exit light of the image transmitting element. CONSTITUTION:This liquid crystal display device has the image transmitting element 1, polarizing plates 2a and 2b, glass substrates 3a and 3b, a sealing compound 4, liquid crystal 5, and the rays of backlight 6. The liquid crystal 5 is held between the glass substrates 3a and 3b, to constitute the liquid crystal display element, and the rays of the backlight 6 pass the liquid crystal display element, to display an image on the liquid crystal display element side of the image transmitting element 1. This image passes through the image transmitting element and is displayed on the surface opposite to the liquid crystal display element. In other words, the image produced by the liquid crystal display element is formed on the light-emitting side of the image transmitting element, as it is, and a person viewing a screen views the image of the surface of the image transmitting element, so that even if he or she views the screen from a diagonal direction, a display state is not changed like when the liquid crystal panel is directly viewed. Therefore, the exit light of the image transmitting element is viewed, so that the characteristics of a visual field angle are improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to improving the viewing angle thereof.

[0002]

2. Description of the Related Art FIG. 2 is a sectional view showing the structure of a conventional liquid crystal display device, that is, a liquid crystal display element (driving circuit etc. is not shown) disclosed in, for example, Japanese Patent Laid-Open No. 102572/1990, and FIG. It is explanatory drawing which showed the direction of the rubbing process at the time of manufacturing a device, and the relationship of a viewing angle. 2a, 2 in the figure
Reference numeral b is a polarizing plate, 3a and 3b are transparent electrode substrates, that is, glass substrates on which elements for driving liquid crystal are formed, 4 is a sealant for adhering the glass substrates 3a and 3b, 5 is liquid crystal, 6 is backlight light, and 7a Is a rubbing treatment direction of the glass substrate 3a, 7b is a rubbing treatment direction of the glass substrate 3b, and 8 is a viewing angle direction in which the display contents of the liquid crystal display element can be seen well.

A commonly used liquid crystal display device is TN.
A display mode called a (Twisted Nematic) type is used. In this method of manufacturing a TN type liquid crystal display device, first, an alignment film (polyimide film or the like) is applied to each of two glass substrates 3a and 3b, and then a rubbing process is performed in directions of arrows 7a and 7b shown in FIG. I do.
Next, the two substrates 3a and 3b are placed at a predetermined interval,
The rubbing-treated surfaces are opposed to each other and combined with the sealant 4, and then the liquid crystal 5 is injected. At this time, if a liquid crystal to which a left-handed chiral substance is added in advance is used, a left-handed 90 ° twisted TN type liquid crystal display device can be obtained.
This TN type liquid crystal display device has a viewing angle (a range in which the display content can be recognized at the minimum when the viewing position is changed vertically and horizontally with the normal direction of the liquid crystal display device being 0 °, and the contrast is usually 10 to 20). It is almost limited to the direction of arrow 8 that the display contents on the screen can be clearly seen because the characteristics are poor (defined in the above range).

[0004]

Since the conventional liquid crystal display device is constructed as described above, the viewing angle characteristics are poor,
The contents displayed on the screen are mostly visible only in a specific direction. When the liquid crystal display device is viewed from a direction deviating from this direction, the contrast is lowered and it looks colored,
There is a problem that the image quality is significantly reduced. In particular, in the case of color display, there is a problem that the color change is large and the viewing angle is very narrow. Further, when a large-screen liquid crystal display device is configured by the conventional method, there is a problem that display unevenness is caused because the angle from the viewer differs depending on the vertical and horizontal directions of the screen.

The present invention has been made to solve the above problems, and an object thereof is to improve viewing angle characteristics.

[0006]

A liquid crystal display device according to the present invention is provided with a liquid crystal display element in which a liquid crystal is sandwiched between a pair of transparent electrode substrates facing each other, and arranged on the side of emitted light of the liquid crystal display element. An image transfer element is provided, and the light emitted from the image transfer element is viewed.

[0007]

According to the present invention, since the emitted light of the liquid crystal display element is not directly seen but the emitted light of the image transmission element is seen, the viewing angle characteristic is improved.

[0008]

【Example】

Example 1. FIG. 1 is a sectional view showing the construction of an embodiment of the present invention. In the figure, 1 is an image transmitting element, 2a and 2b are polarizing plates, 3a and 3b are glass substrates, 4 is a sealant, 5 is liquid crystal, and 6 is backlight light. Glass substrates 3a, 3
A liquid crystal display element is configured by sandwiching the liquid crystal 5 between b, and the backlight light 6 passes through the liquid crystal display element and displays an image on the liquid crystal display element side of the image transmission element 1. This image passes through the image transfer element and is displayed on the surface opposite to the liquid crystal display element. In other words, the image created by the liquid crystal display element is directly formed on the exit side of the image transfer element, and the viewer of the screen sees the image on the surface of the image transfer element. There is no change in the display state as seen directly.

In this case, as the image transfer element 1, optical fibers such as an optical fiber having a diameter smaller than one pixel (or one picture element) of the liquid crystal display element, which transmits light in only one direction with low loss, are gathered into a plate shape. Use the one that you made. For example, a fiber optic plate (manufactured by Hamamatsu Photonics KK) or the like is used.

If the image transmitting element 1 is applied to each liquid crystal display element of a display device in which a large screen is composed of a plurality of liquid crystal display elements, the viewing angle characteristics of the entire screen can be greatly improved. Furthermore, if used in a scattering type liquid crystal display device,
Unnecessary scattered light that deteriorates the image quality can be removed, and the display quality is improved.

[0011]

As described above, according to the present invention, a liquid crystal display element in which a liquid crystal is sandwiched between a pair of transparent electrode substrates facing each other, and an image transmission arranged on the outgoing light side of the liquid crystal display element. Since the element is provided and the light emitted from the image transmission element is viewed, the viewing angle characteristic can be significantly improved. Further, in a large-sized liquid crystal display device in which a plurality of liquid crystal display elements are arranged to form a large screen or in a large-sized liquid crystal display device composed of one glass substrate, it is possible to reduce display unevenness due to viewing angle characteristics.

[Brief description of drawings]

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

FIG. 2 is a structural cross-sectional view showing a conventional liquid crystal display device.

FIG. 3 is an explanatory diagram showing a relationship between an alignment treatment direction and a visual field direction of the liquid crystal display device.

[Explanation of symbols]

 1 image transfer element 2a polarizing plate 2b polarizing plate 3a glass substrate 3b glass substrate 5 liquid crystal 6 backlight light 7a rubbing direction 7b rubbing direction

Claims (1)

Claim: What is claimed is: 1. A liquid crystal display device comprising a pair of transparent electrode substrates facing each other with a liquid crystal sandwiched therebetween, and an image transfer device disposed on the side of outgoing light of the liquid crystal display device. A liquid crystal display device configured to look at the light emitted from the image transfer element.