JPH0633135U - Polymer dispersed liquid crystal display device - Google Patents

Abstract

(57) [Summary] [Structure] A polymer-dispersed liquid crystal 3 composed of a polymer matrix 1 and a liquid crystal 2 is provided with a pair of glass plates 4 having transparent electrodes.
A black plate 5 which is a non-transmissive plate (or a film) is laminated on the outer surface of one glass plate 4'while being laminated in a sandwich form 4 '.
And the backlight 6 is arranged along one side edge of the edge of the one glass plate 4 ′ and the black plate 5. [Effect] Since the light source is arranged at the end face edge of the glass plate with the transparent electrode, when the light is incident on the polymer dispersed liquid crystal from the light source, the one glass plate with the transparent electrode also functions as a light guide. As a result, the in-plane brightness is uniform, the light source is not directly visible, and the polymer dispersed liquid crystal display element can be made thin.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a polymer dispersed liquid crystal display device used in a display device.

[0002]

[Prior art]

 FIG. 4 is a cross-sectional view of a polymer dispersed liquid crystal display device employing a conventional backlight. That is, in the conventional direct-view type polymer-dispersed liquid crystal display device a, a polymer-dispersed liquid crystal b is laminated in a sandwich form with a pair of glass plates c and c'having transparent electrodes, and one glass plate c'is also laminated. A backlight d for illumination is disposed below the.

Since the conventional direct-view type polymer dispersion type liquid crystal display device a is configured as described above, when displaying, a power source e and a scan are applied to the transparent electrodes of the pair of glass plates c and c ′. It is displayed by connecting the switch f and opening and closing the switch f. That is, when the switch f is opened, the light i from the backlight d becomes scattered light j due to the mismatch of the refractive indexes of the polymer matrice g and the liquid crystal h which compose the polymer dispersed liquid crystal b. The type liquid crystal b cannot be transmitted.

When the switch f is closed, the refractive index of the polymer matrix g and the liquid crystal h that compose the polymer dispersed liquid crystal b is the same, and the light i from the backlight d is polymer dispersed. The liquid crystal b can be transmitted (see FIG. 5). In order to perform the display utilizing such scattering and transmission, as shown in FIG. 6, the high molecular dispersion type liquid crystal display element a'has a black color with a space m on the back surface of one glass plate c '. The plate k is provided and the backlight d'is provided on the edge side of the interval m (or on the back surface of one glass plate c ').

Therefore, as shown in FIG. 6, when the switch f is opened, the light i from the backlight d ′ is generated due to the mismatch of the refractive index between the polymer matrice g and the liquid crystal h constituting the polymer dispersed liquid crystal b. Becomes scattered light j and cannot pass through the polymer dispersed liquid crystal b. When the switch f is closed, the refractive indexes of the polymer matrices g and the liquid crystal h forming the polymer dispersed liquid crystal b match, and the light i from the backlight d is partially converted to the polymer dispersed liquid crystal b. The light is transmitted and partly illuminates the black plate k. An observer above the polymer-dispersed liquid crystal display element a ′ sees the black plate k through the polymer-dispersed liquid crystal display element a ′, thereby obtaining a black display (see FIG. 7).

Since the conventional example is configured as described above, when the backlight d is arranged immediately below one glass plate c ′ in FIG. 4, the backlight d is turned on when the switch f is closed. It has the drawback of being visible as it is. Further, when the backlight d ′ in FIG. 6 is arranged on the edge side, the brightness varies depending on the light reaching distance, and the uneven brightness in the surface becomes conspicuous, and a uniform contrast cannot be obtained. There are drawbacks.

Further, both of them have a drawback that the thickness of the display element increases because the backlight is installed on the back side of the polymer dispersion type liquid crystal display element.

[0008]

[Problems to be solved by the device]

 The present invention has been made in view of the above points, and an object thereof is to provide a polymer-dispersed liquid crystal display device which has a uniform in-plane brightness and a thin display device.

[0009]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a polymer dispersed liquid crystal display device in which a polymer dispersed liquid crystal is sandwiched between a pair of glass plates with transparent electrodes. A non-transmissive plate is installed side by side, and a light source is arranged at the edge of the transparent electrode-attached glass plate to allow light to enter the polymer-dispersed liquid crystal from the light source. The plate guides light, and the polymer-dispersed liquid crystal displays black and white by the electric field applied to the polymer-dispersed liquid crystal.

[0010]

[Action]

 In a polymer-dispersed liquid crystal display element in which polymer-dispersed liquid crystal is sandwiched between a pair of glass plates with transparent electrodes, one glass plate with transparent electrodes is provided with a non-transmissive plate and Since the light source is arranged on the edge of the end face of the attached glass plate, when the light is made incident on the polymer dispersed liquid crystal from the light source, the glass plate with the transparent electrode also functions as a light guide, and The brightness is uniform and the thickness of the polymer dispersed liquid crystal display device can be made thin.

[0011]

【Example】

 FIG. 1 is a perspective view of a polymer dispersed liquid crystal display device A according to the present invention. That is, a polymer-dispersed liquid crystal 3 composed of a polymer matrix 1 and a liquid crystal 2 is laminated in a sandwich shape with a pair of glass plates 4 and 4'having transparent electrodes, and one glass plate 4'is provided on the outer surface thereof. A black plate 5 which is a non-transparent plate (or a film) is provided side by side, and a backlight 6 is arranged along one edge of the edge of the one glass plate 4'and the black plate 5 (see FIG. 2). ). Reference numeral 7 is a reflector for the backlight 6.

The polymer-dispersed liquid crystal display device A according to the present invention is constructed as described above, and therefore, when used, as shown in FIG. 2, the transparent electrodes of the pair of glass plates 4 and 4'are used. The power source 8 and the switch 9 are connected to.

When the switch 9 is opened and no voltage is applied to the pair of glass plates 4 and 4 ′, the backlight of the backlight is caused by the mismatch of the refractive index between the polymer matrix 1 and the liquid crystal 2 of the polymer dispersed liquid crystal 3. The light emitted from 6 enters the end face of the polymer-dispersed liquid crystal 3 and becomes light 10, but the light 10 hits the liquid crystal 2 and is scattered and becomes scattered light 11, which is visually recognized from above as white display.

When the switch 9 is closed and voltage is applied to the pair of glass plates 4 and 4 ′, as shown in FIG. 3, the polymer matrix 1 and the liquid crystal 2 of the polymer dispersed liquid crystal 3 are separated. Since the refractive indices match, the light 10 emitted from the backlight 6 passes through the polymer-dispersed liquid crystal 3 and is reflected at the boundary surface between the polymer-dispersed liquid crystal 3 and the air, and again the polymer-dispersed liquid crystal The light 10 'enters the inside of the beam 3.

At this time, an observer from the upper surface of the polymer dispersed liquid crystal 3 sees the black plate 5 on the back through the transparent polymer dispersed liquid crystal 3 to obtain a black display. That is, by applying or not applying a voltage to the polymer-dispersed liquid crystal 3, black and white display is possible as shown in FIGS.

The polymer-dispersed liquid crystal may be any type such as a liquid crystal capsule type and a polymer network type as long as it utilizes matching between the refractive indices of the liquid crystal and the polymer.

As the driving method, either simple matrix driving or active driving provided with a switching element is possible. In addition, a light reflector is installed on the edge of the polymer dispersed liquid crystal without the light source so that the light does not escape.

[0018]

[Effect of device]

 As described above, according to the polymer dispersed liquid crystal display device of the present invention, one of the transparent electrodes is a polymer dispersed liquid crystal display device in which a polymer dispersed liquid crystal is sandwiched between a pair of glass plates with transparent electrodes. Since a non-transmissive plate is provided on the outer surface of the attached glass plate, and a light source is disposed on the edge of the transparent electrode-attached glass plate, when light is incident on the polymer-dispersed liquid crystal from the light source, The one glass plate with the transparent electrode also functions as a light guide, the in-plane brightness is uniform, the light source is not directly visible, and the polymer dispersed liquid crystal display element can be made thin. It has many great effects such as.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment.

FIG. 2 is a diagram illustrating the operation of the embodiment.

FIG. 3 is also an operation explanatory diagram of the embodiment.

FIG. 4 is an operation explanatory view of a conventional example.

FIG. 5 is an explanatory diagram of an operation of a conventional example.

FIG. 6 is an operation explanatory view of another conventional example.

FIG. 7 is an operation explanatory view of another conventional example.

[Explanation of symbols]

 A Polymer dispersed liquid crystal display device 1 Polymer matrisk 2 Liquid crystal 3 Polymer dispersed liquid crystal 4, 4'Glass plate 5 Black plate 6 Backlight 7 Reflector 8 Power supply 9 Switch 10 Light

Claims (1)

[Scope of utility model registration request] 1. A polymer-dispersed liquid crystal display device in which a polymer-dispersed liquid crystal is sandwiched between a pair of glass plates with transparent electrodes, and a non-transmissive plate is provided on the outer surface of one of the glass plates with transparent electrodes. A light source is disposed at an edge of the transparent electrode-attached glass plate, and light is incident on the end face of the polymer dispersed liquid crystal from the light source, and the one transparent electrode-attached glass plate guides light, A polymer-dispersed liquid crystal display device, wherein the polymer-dispersed liquid crystal displays black and white by an electric field applied to the molecule-dispersed liquid crystal.