JPH0615040U - Liquid crystal display - Google Patents

Abstract

(57) [Abstract] [Purpose] A liquid crystal display device that can be used both as a transmissive type and as a reflective type so as to enable clear display. [Composition] A liquid crystal cell capable of switching a light transmitting function or a light reflecting function is provided between two display liquid crystal cells. When used as a transmissive type, the liquid crystal cell is switched to a transmissive function state, and when used as a reflective type, switched to a reflective function state.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a liquid crystal display device.

[0002]

[Prior art]

 Various types of liquid crystal display devices are used according to the purpose and use of the liquid crystal display device. For example, as shown in FIG. 2, a semi-transmissive light reflection film is formed between display liquid crystal cells a and b having a dichroic dye. There is a structure in which a plate c is sandwiched, a light diffusing plate d is disposed on the rear surface side of a liquid crystal cell b on the rear side, and a light source e is further provided behind it.

In the liquid crystal display device, the semi-transmissive light reflection plate c has both a function of transmitting light and a function of reflecting light, and if the light source e is turned on and the light ray L thereof is transmitted, a transmissive liquid crystal display is displayed. The liquid crystal cells a and b can be combined or displayed as a device, and if a light ray L'from the outside is made incident when the light source e is not lit, a part of the light ray is transmitted but a part is reflected. Then, the light is emitted again to the outside, so that the liquid crystal cell a can be displayed as a reflection type liquid crystal display device.

[0004]

[Problems to be solved by the device]

 However, the semi-transparent reflection plate c is either order to reflect mid transmitted mid rays function becomes halfway, may not clear display is obtained by the light amount. The present invention has been made in order to solve such conventional problems, and an object thereof is to provide a liquid crystal display device capable of performing clear display while maintaining both transmission and reflection functions. is there.

[0005]

[Means for Solving the Problems]

 As a means for technically solving this problem, the present invention is characterized in that a liquid crystal cell capable of switching a light transmitting function or a light reflecting function is provided between two display liquid crystal cells. Is.

[0006]

[Action]

 By switching the transmissive function or reflective function of the liquid crystal cell provided in the middle, it can be operated as a transmissive or reflective liquid crystal display device. The utilization rate is improved, and extremely clear display can be obtained in any case.

[0007]

【Example】

 Hereinafter, the present invention will be described in more detail with reference to the illustrated embodiments. In FIG. 1, reference numerals 1 and 2 are liquid crystal cells for display each having a dichroic dye, and a switching liquid crystal cell 3 is interposed therebetween.

The display liquid crystal cells 1 and 2 are capable of displaying desired images and the like in color, respectively, while the switching liquid crystal cell 3 has both a light transmitting function and a light reflecting function, and also has a current-carrying function. It is possible to freely switch between these two functions by means.

Reference numeral 4 denotes a diffusion plate, which is attached to the rear surface side of the display liquid crystal cell 2 and further has a light source 5 behind it.

The liquid crystal display device according to the present invention is configured as described above, and both the transmissive type and the reflective type can be selectively used.

When used as a transmissive type, the light source 5 may be turned on and the switching liquid crystal cell 3 may be in a transmissive function state without applying a voltage. At this time, the light ray L from the light source 5 passes through the diffusion plate 4 and is uniformly diffused, and at the same time, is transmitted through the display liquid crystal cell 2, the switching liquid crystal cell 3, and the display liquid crystal cell 1 in this order. To reach Viewer 6.

Therefore, both the composite images or either one of the images can be visually recognized by the display operation of the display liquid crystal cells 1 and 2, and the display liquid crystal cell 3 transmits almost all the light rays L. It makes it extremely clear.

In the case of use as a reflective type, the light source 5 may be turned off and the switching liquid crystal cell 3 may be switched to the reflective function state by applying a voltage. At this time, the light ray L ′ incident from the outside is reflected by the switching liquid crystal cell 3, passes through the display liquid crystal cell 1 again, and is emitted to the outside to reach the viewer 6.

Therefore, the image can be visually recognized by the display operation of the display liquid crystal cell 1. At this time, the switching liquid crystal cell 3 reflects almost all the incident light rays, so that the display image becomes extremely clear.

When the surroundings are bright, such a reflective display can reduce the power consumption of the light source 5.

The display liquid crystal cell is not limited to a color display having a dichroic dye, and may be a normal non-color display or a combination of color display and non-color display. Absent.

[0017]

[Effect of device]

 As described above, according to the present invention, since the liquid crystal cell capable of freely switching the light transmitting function and the light reflecting function is interposed between the two liquid crystals for display, the liquid crystal cell may be a transmissive type or a transparent type. Both reflective types can be selectively used, and in any use, almost all of the light rays can be used effectively, resulting in an extremely clear display image, significantly improving the visibility and improving the quality of the liquid crystal display device. It has excellent effects such as enhancement.

[Submission date] February 17, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

The display liquid crystal cells 1 and 2 are capable of displaying desired images and the like in color, respectively, while the switching liquid crystal cell 3 has both a light transmitting function and a light reflecting function, and also has a current-carrying function. It is possible to freely switch between these two functions by means. The switching liquid crystal cell uses a type of liquid crystal that switches between scattering and transmission depending on the strength of an applied electric field, such as DS mode (dynamic scattering) display utilizing a dynamic scattering effect.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

1, 2 ... Liquid crystal cell for display 3 ... Liquid crystal cell for switching
4 ... Diffusion plate 5 ... Light source

Claims (1)

[Scope of utility model registration request] 1. A liquid crystal display device comprising a liquid crystal cell capable of switching a light transmitting function or a light reflecting function between two display liquid crystal cells.