JP2000098323A - Color selection light quantity adjusting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color selection light quantity adjusting device capable of selecting a required color beam with a single area, adjusting its light quantity, emitting it, arranging such a single area on a pixel pattern, and constituting a color video display panel. SOLUTION: This device 1 consists of a color selection absorption panel part 2 and a light quantity control emission panel part 3. The color selectively absorption panel part 2 absorbs the beam of a specified wavelength in a white beam made incident on a boundary between a first silver thin film 7 and a first dielectric layer 6 by generating a surface plasmon wave according to a voltage value applied to the first dielectric layer 6. The light quantity control emission panel part 3 generates the surface plasmon wave on the boundary between a second silver thin film 9 and a second dielectric layer 10 by the surface plasmon wave generated on the color selection absorption panel part 2 side, and emits the absorbed beam (selected color beam), and controls the light quantity of the emission beam according to the voltage value applied to the second dielectric layer 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color selection light amount adjusting device which can be used as a filter or a color image display panel which adjusts and transmits only a specific color light amount.

[0002]

2. Description of the Related Art Conventionally, in a color liquid crystal display panel, a color filter formed by printing a coloring material of each color in order to obtain three primary colors of R (red), G (green), and B (blue). Is used. Further, the incident light is diffracted and spectrally separated using a hologram, and R, G, B
It has also been proposed to use a hologram color filter (HCF) that causes light of the color component to enter a desired position.

[0003]

However, in each of the above-mentioned prior arts, it is necessary to form three sub-pixels of R, G and B in order to form one color pixel.
There is a disadvantage that the pixel density is reduced. In addition, since fine processing is required to improve the pixel density, there is a disadvantage that the yield of the color video display panel is reduced.

In view of the above circumstances, the present invention realizes selecting a desired color light in a single area, adjusting the amount of light, and emitting the light, and arranging the single area in a pixel pattern. It is an object of the present invention to provide a color selection light amount adjusting device capable of forming a color image display panel by using the same.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a color-selecting-light-amount adjusting apparatus according to the present invention includes a light-selecting device for adjusting the amount of light incident on an interface between a first metal thin film and a first transparent dielectric material. A color selecting and absorbing means for absorbing light of a specific wavelength in accordance with a voltage value applied to the first transparent dielectric material; a second metal thin film and a second transparent thin film with the energy of the absorbed light; Light emission control means for exciting the interface with the dielectric material to emit light and controlling the light intensity of the emission light in accordance with the voltage value applied to the second transparent dielectric material. Features.

With the above arrangement, a specific color light is selected by adjusting the voltage applied to the first transparent dielectric material, and the voltage applied to the second transparent dielectric material is adjusted. Thus, the amount of the selected color light can be adjusted and emitted. That is, it becomes possible to transmit only a specific color light with a desired light amount.

The color selection and absorption means comprises a transparent dielectric substrate, a transparent electrode, a first transparent dielectric material, and a first metal thin film arranged in order from the light incident side, and the light quantity controlled emission is performed. The means is composed of a second metal thin film, a second transparent dielectric material, a transparent electrode, and a transparent dielectric substrate which are arranged in order from the light incident side. The first metal thin film and the second metal thin film may be bonded together with a third transparent dielectric material interposed therebetween. Further, the first transparent dielectric material and the second transparent dielectric material may be made of liquid crystal.

The image display screen may be constructed by providing pixels arranged in a matrix in which the color selection absorbing means and the light quantity control emitting means are stacked. According to this, since one color pixel is constituted by the pair of color selection and absorption means and the light quantity control and emission means, it is possible to improve the pixel density and the yield.

Further, a color selection light amount adjusting device according to the present invention comprises:
A metal thin film is formed on both sides of a transparent dielectric material, and light of a specific wavelength among light incident on an interface with the metal thin film formed on one side of the transparent dielectric material is transmitted through the metal thin film. Color selective transmission means for absorbing the light according to the voltage value applied to the transparent dielectric material and emitting the absorbed light through the metal thin film on the other side, and a metal thin film formed on both sides of the transparent dielectric material. Light quantity control emission means for receiving the selected light and controlling the emission light quantity of the incident selection light according to a voltage value applied to a transparent dielectric material via the metal thin film. It is characterized by.

According to the above arrangement, a specific color light is selected and transmitted by adjusting the voltage value applied to the transparent dielectric material of the color selection and transmission means, and is applied to the transparent dielectric material of the light quantity controlled emission means. The amount of the selected color light can be adjusted and emitted by adjusting the applied voltage value. That is, it becomes possible to transmit only a specific color light with a desired light amount.

The color selective transmission means comprises a light incident side transparent dielectric substrate, a metal thin film, a transparent dielectric material, a metal thin film, and a light emission side transparent dielectric substrate which are arranged in order from the light incident side, The light amount controlled emission means may be composed of a light incident side transparent dielectric substrate, a metal thin film, a transparent dielectric material, a metal thin film, and a light emission side transparent dielectric substrate arranged in order from the light incident side. . Further, the light emitting side transparent dielectric substrate in the color selection and transmission means and the light incident side transparent dielectric substrate in the light quantity control emitting means may be shared. Further, the transparent dielectric material may be made of liquid crystal. Further, a video display screen may be configured by providing pixels formed by laminating the color selection transmission means and the light quantity control emission means in a matrix.

Further, the color selection light amount adjusting device according to the present invention comprises:
A metal thin film is formed on both sides of a transparent dielectric material, and light of a specific wavelength among light incident on an interface with the metal thin film formed on one side of the transparent dielectric material is transmitted through the metal thin film. A color-selecting transmission means for absorbing the light according to the voltage value applied to the transparent dielectric material and emitting the absorbed light through the metal thin film on the other side; A liquid crystal light valve, comprising a plate and an output side polarizing plate, for receiving the selected light, controlling a twist of liquid crystal molecules in a liquid crystal layer by an electric field, and controlling an output light amount of the incident selected light. It is characterized by having.

With the above arrangement, the voltage value applied to the transparent dielectric material of the color selecting / transmitting means is adjusted to select and transmit a specific color light, and the voltage value applied to the liquid crystal of the liquid crystal light valve is adjusted. By adjusting, the light amount of the selected color light can be adjusted and emitted. That is, it becomes possible to transmit only a specific color light with a desired light amount.

The color selecting and transmitting means is composed of a light incident side transparent dielectric substrate, a metal thin film, a transparent dielectric material, a metal thin film, and a light emitting side transparent dielectric substrate arranged in order from the light incident side. You may. Further, the transparent dielectric material may be made of liquid crystal. Further, a display screen may be configured by providing pixels formed by laminating the color selection transmission means and a liquid crystal light valve in a matrix.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) FIG. 1 shows a color selection light amount adjusting device 1 configured as a color image display panel.
It is sectional drawing which showed. As shown in FIG. 1, the color selection light amount adjusting device 1 includes a color selection absorption panel unit 2 that absorbs a specific color light by generating a surface plasmon wave, and a surface generated on the color selection absorption panel unit 2 side. A light-quantity control emission panel unit 3 which receives the plasmon wave and excites the surface plasmon wave to emit the absorbed color light after adjusting its light intensity. A transparent dielectric layer 8 made of glass, resin, or the like is interposed between the color selection absorption panel section 2 and the light quantity control emission panel section 3 (between the silver thin films 7 and 9). The dielectric layer 8 functions to propagate the energy of the color light absorbed by the color selection and absorption panel 2 to the light quantity control emission panel section 3.

The color selection / absorption panel section 2 includes a transparent glass substrate 4 arranged on a white light source side (not shown), and a transparent electrode (for example, ITO) 5 having a solid pattern formed on the transparent glass substrate 4. A transparent first dielectric layer 6 formed on the transparent electrode 5; and a first silver thin film 7 opposed to the transparent electrode with the first dielectric layer 6 interposed therebetween. The first dielectric layer 6 is a liquid crystal layer in this embodiment. This liquid crystal layer is in a parallel alignment. The first silver thin film 7 serves as a pixel electrode, and is formed in a pattern corresponding to the pixel arrangement pattern. A voltage of an arbitrary value is selectively applied to each first silver thin film 7 by a wiring pattern (not shown). Can be supplied. This voltage value is generated based on a color signal in color video display. That is, generation of surface plasmon waves can be controlled in pixel units based on color signals in color video display. By the supply of the voltage of the arbitrary value, the refractive index changes in a portion of the first dielectric layer 6 interposed between the first silver thin film 7 to which the voltage is supplied and the transparent electrode 5,
Of the light (white light) incident on the interface between the first dielectric layer 6 and the first silver thin film 7 in the portion where the refractive index has changed, only light of a specific wavelength (B (blue) light in FIG. 1) Is absorbed as a surface plasmon wave and becomes light complementary to the light (R in FIG. 1).
(Red) light and G (green) light) will be reflected.

The light quantity control emission panel section 3 includes a transparent glass substrate 12 disposed on the light emission side, a transparent electrode (for example, ITO) 11 having a solid pattern formed on the transparent substrate 12, and A transparent second dielectric layer formed on the transparent electrode, and the second dielectric layer;
And a second silver thin film 9 opposed to the transparent electrode 11 with the intermediary of the transparent electrode 11. The second dielectric layer 10 is formed of the same liquid crystal layer as the first dielectric layer. This liquid crystal layer is in a parallel alignment. The second silver thin film 9 serves as a pixel electrode and is formed in a pattern corresponding to the pixel arrangement pattern, and a voltage of an arbitrary value is selectively applied to each second silver thin film 9 by a wiring pattern (not shown). It can be supplied to. This voltage value is generated based on a luminance signal in color image display.

Another surface plasmon wave is excited in the pixel portion on the side of the light quantity control emission panel 3 corresponding to the pixel portion by the surface plasmon wave generated in the pixel portion of the color selection absorption panel portion 2. Then, by applying a voltage of an arbitrary value to the pixel portion, the refractive index of the second dielectric layer 10 in the portion to which the voltage is applied changes, and the refractive index causes the surface plasmon wave. The absorption light (selective color light) is emitted with the highest light transmittance if it is equal to the refractive index of the portion of the first dielectric layer 6, and if the refractive index is different, the light transmittance is in accordance with the degree of the difference. The absorbed light (selected color light) is emitted. The light emission direction is the same as the incident direction.

Here, the characteristics of the color selection and absorption panel section 2 are as follows:
If it is assumed that the color absorption characteristic changes from red to purple with respect to a change in the applied voltage value of 0 V to 30 V (red absorption at 0 V, green absorption at 10 V, blue absorption at 25 V), display at each pixel Table 1 below shows an example of a voltage value applied to the first silver thin film 7 and the second silver thin film 9 for a desired color.

[0020]

[Table 1] V1 ≠ V2 in the black display means that, for example, V1 is applied to the color selection absorption panel section 2 on the assumption that the color selection absorption panel section 2 and the light quantity control emission panel section 3 have the same structure (material, film thickness, etc.). This means that V2 is selected so that the light transmission / reflection panel unit 3 can obtain a frequency transmission (reflection) waveform that does not overlap as much as possible with respect to the frequency transmission (reflection) waveform. When the structure of the color selection absorption panel unit 2 and the structure of the light quantity control emission panel unit 3 are different, it is possible that V1 = V2 in black display. The mode of voltage application shown in Table 1 is an example and is not limited to the mode of Table 1.

With the above configuration, a specific light is selected by adjusting the voltage value applied to the first dielectric layer 6, and the voltage value applied to the second dielectric layer 10 is adjusted. This makes it possible to adjust the emitted light amount of the selected color light.
That is, it becomes possible to transmit only a specific color light with a desired light amount. The first silver thin film 7 and the second silver thin film 9 are used as pixel electrodes, and by controlling the excitation of the surface plasmon wave in pixel units, each pixel portion can control the color and the amount of light transmitted therethrough. Therefore, the pixel density and the yield can be improved.

In the above-described example, a so-called DC drive system is shown, but the first dielectric layer 6 and the second dielectric layer 1
When a liquid crystal is used as 0, it is desirable to employ a so-called AC driving method. When this AC driving method is adopted, it is preferable that the transparent electrode 5 and the transparent electrode 11 are also formed in a pattern corresponding to the pixel arrangement pattern.

(Embodiment 2) FIG. 2 is a cross-sectional view showing a color selection light amount adjusting device 21 configured as a color image display panel of this embodiment. The color selection light amount adjusting device absorbs a specific color light by generating a surface plasmon wave and emits the color light, and a color selection transmission panel 22 and the color light emitted from the color selection transmission panel 22 are incident thereon. A light quantity control emission panel 23 for controlling the surface plasmon wave based on the color light by an applied voltage to control the light emission amount of the color light.

The color selection transmission panel 22 includes a transparent glass substrate 24 disposed on a white light source (not shown), a silver thin film electrode 25 formed on the transparent glass substrate 24,
It comprises a transparent glass substrate 28 disposed on the light emitting side, a silver thin film electrode 27 formed on the transparent glass substrate 28, and a transparent dielectric layer 26 formed between the electrodes 25,27. The dielectric layer 26 is a liquid crystal layer in this embodiment. The liquid crystal layer is in a parallel alignment. Silver thin film electrode 2
Reference numerals 5 and 27 denote pixel electrodes, each of which is formed in a pattern corresponding to the pixel arrangement pattern. A voltage of an arbitrary value is selectively supplied to the individual silver thin film electrodes 25 and 27 by a wiring pattern (not shown). You can do it. This voltage value is generated based on a color signal in color video display. That is, generation of surface plasmon waves can be controlled in pixel units based on color signals in color video display. By applying the voltage of the arbitrary value, the dielectric layer 2 in the portion to which the voltage is applied
6, the refractive index changes, and only light of a specific wavelength out of the light (white light) incident on the interface between the dielectric layer 26 and the silver thin film electrode 25 in the portion where the refractive index has changed becomes a surface plasmon wave. The light that is absorbed by the light and becomes a complementary color of the light is reflected. Then, another surface plasmon wave having the same frequency as the surface plasmon wave is generated at the interface between the dielectric layer 26 and the silver thin film electrode 27, and the above-mentioned absorbed light (selective color light) is emitted.

The light quantity control emission panel 23 includes a transparent glass substrate 29 arranged on the selective light emission side of the color selection transmission panel 22, a silver thin film electrode 30 formed on the transparent glass substrate 29, It comprises a transparent glass substrate 33 disposed on the emission side, a silver thin film electrode 32 formed on the transparent glass substrate 33, and a transparent dielectric layer 31 formed between the electrodes 30, 32. The dielectric layer 31 is a liquid crystal layer in this embodiment. The liquid crystal layer is in a parallel alignment. The silver thin-film electrodes 30 and 32 serve as pixel electrodes, and are formed in a pattern corresponding to the pixel arrangement pattern, and a voltage of an arbitrary value is selected for each of the silver thin-film electrodes 30 and 32 by a wiring pattern (not shown). It is possible to apply the voltage. This voltage value is generated based on a color signal in color video display. When the color light selected by the color selection transmission panel 22 enters, surface plasmon waves can be generated at the interface between the dielectric layer 31 and the silver thin-film electrodes 30 and 32. If the applied voltage value is most suitable for exciting the surface plasmon wave by the selected color light, the selected light will be emitted with the highest transmittance. If the voltage value is slightly shifted, the shift (transmission peak) The selected light is emitted with a transmittance corresponding to the frequency shift). That is, brightness control is performed.

With the above structure, the specific light is selected by adjusting the voltage applied to the dielectric layer 26, and the selected light is adjusted by adjusting the voltage applied to the dielectric layer 31. After adjusting the amount of transmitted light, the light can be emitted. That is, it becomes possible to transmit only a specific color with a desired amount of light. The silver thin-film electrode is used as a pixel electrode, and by controlling the excitation of surface plasmon waves on a pixel-by-pixel basis, each pixel portion is realized as a color pixel capable of controlling its light transmission color and light amount. It is possible to improve the yield and the yield.

In this embodiment, each of the pair of silver thin-film electrodes sandwiching the dielectric layer is formed in a pixel arrangement pattern, but one of the silver thin-film electrodes may be formed in a solid pattern. Further, the emission-side glass substrate 28 in the color selection transmission panel 22 and the incidence-side glass substrate 29 in the light quantity control emission panel 23 may be shared by both panels to realize integration.

(Embodiment 3) FIG. 3 is a sectional view showing a color selection transmission device 41 configured as a color video display panel of this embodiment. The color selection light amount adjustment device 41 absorbs a specific color light by generating a surface plasmon wave and emits the color light, and the color selection transmission panel 42 receives the color light emitted from the color selection transmission panel 42. And a liquid crystal light valve 43 for controlling the amount of transmitted light.

The color selection transmission panel 42 includes a transparent glass substrate 44 disposed on a white light source (not shown), a silver thin film electrode 45 formed on the transparent glass substrate 44,
The transparent dielectric layer 46 formed on the silver thin film electrode 45
A transparent glass substrate 48 disposed on the light emission side, a silver thin film electrode 47 formed on the transparent glass substrate 48,
And a transparent dielectric layer 46 formed between the electrodes 45 and 47. The dielectric layer 46 is a liquid crystal layer in this embodiment. The liquid crystal layer is in a parallel alignment. The silver thin-film electrodes 45 and 47 serve as pixel electrodes, each of which is formed in a pattern corresponding to the pixel arrangement pattern.
Can be selectively supplied with an arbitrary value of voltage. This voltage value is generated based on a color signal in color video display. That is, generation of surface plasmon waves can be controlled in pixel units based on color signals in color video display. By the application of the voltage of the arbitrary value, the refractive index changes in the portion of the dielectric layer 46 to which the voltage has been applied, and the interface between the dielectric layer 46 and the silver thin film electrode 45 in the portion where the refractive index has changed changes. Of the incident light (white light), only light of a specific wavelength is absorbed as a surface plasmon wave, and light complementary to the light is reflected. Then, another surface plasmon wave having the same frequency as the surface plasmon wave is generated at the interface between the dielectric layer 46 and the silver thin-film electrode 47, and the above-mentioned absorbed light (selective color light) is emitted.

The liquid crystal light valve 43 includes an incident side polarizing plate 49 disposed on the side where the selected light is incident, an incident side transparent glass substrate 50, and a solid pattern transparent glass substrate formed on the transparent glass substrate 50. Electrode (for example, ITO) 51
An emission-side polarizing plate 55 disposed on the light emission side; an emission-side transparent glass substrate 54; a transparent pixel electrode (for example, ITO) 53 formed on the transparent glass substrate 54; And a liquid crystal layer 52 filled between the transparent electrodes 51.

With the above configuration, a specific light is selected by adjusting the voltage applied to the dielectric layer 46, and the voltage applied to the liquid crystal layer 52 of the liquid crystal light valve 43 is adjusted. After adjusting the transmitted light amount of the selected light, the light can be emitted. That is, it becomes possible to transmit only a specific color with a desired amount of light. Then, by controlling the excitation of surface plasmon waves in pixel units, the color of the light transmission is controlled in each pixel portion, and a color pixel capable of controlling the amount of light in the pixel portion on the liquid crystal light valve side corresponding to the pixel portion. Has been realized,
The pixel density and the yield can be improved.

In the embodiment described above, a silver (Ag) thin film is used as the metal thin film, but other metals may be used, and a liquid crystal is used as the dielectric material. Other dielectric materials may be used. Further, for example, the thickness of the dielectric material forming the interface with the metal thin film may be several hundred nm, but is not limited thereto. In addition, since it is mainly a P wave that can excite the surface plasmon wave, it is necessary to align the light source light (white light) with the P wave and to guide the light to the color selection absorption panel or the color selection transmission panel to improve the light use efficiency. Desirable in point.

[0033]

As described above, according to the present invention, it is possible to select a desired color light in a single region, adjust the amount of light, and emit the light. When such a single region is arranged in a pixel pattern to form a color video display panel, there is an effect that the pixel density and the yield of the color video display panel can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a color selection light amount adjusting device constituting a color image display panel according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a color selection light amount adjusting device forming a color image display panel according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of a color selection light amount adjusting device forming a color image display panel according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Color selection light quantity adjustment device 2 Color selection absorption panel 3 Light quantity control emission panel 4 Transparent glass substrate 5 Transparent electrode 6 First dielectric layer 7 First silver thin film 9 Second silver thin film 10 Second dielectric layer 11 Transparent electrode 12 Transparent glass substrate 21 Color selection light control device 22 Color selection transmission panel 23 Light control emission panel 41 Color selection light control device 42 Color selection transmission panel 43 Liquid crystal light valve

Claims (13)

[Claims] 1. A light of a specific wavelength among light incident on an interface between a first metal thin film and a first transparent dielectric material is converted to the first light.
And a color selection / absorption unit that absorbs according to the voltage value applied to the transparent dielectric material, and excites the interface between the second metal thin film and the second transparent dielectric material with the energy of the absorbed light. And a light amount controlling and emitting means for controlling the light amount of the emitted light in accordance with a voltage value applied to the second transparent dielectric material. 2. The color selection / absorption means includes a transparent dielectric substrate, a transparent electrode, a first transparent dielectric material, and a first metal thin film arranged in this order from a light incident side, and the light quantity The controlled emission unit is a second emission unit arranged in order from the light incident side.
A thin metal film, a second transparent dielectric material, a transparent electrode, and a transparent dielectric substrate, wherein the color-selecting absorbing means and the light-quantity-controlled emitting means are provided between the first metal thin film and the second metal thin film. 2. The color selection light amount adjusting device according to claim 1, wherein the device is attached with a third transparent dielectric material interposed therebetween. 3. An apparatus according to claim 1, wherein the first transparent dielectric material and the second transparent dielectric material are made of liquid crystal. 4. The image display screen according to claim 1, wherein pixels formed by laminating the color selection absorbing means and the light quantity control emitting means are arranged in a matrix.
The color selection light amount adjusting device according to any one of the above. 5. A transparent dielectric material having a metal thin film formed on both sides thereof, and a light having a specific wavelength among light incident on an interface with the metal thin film formed on one side of the transparent dielectric material. A color-selecting transmission means for absorbing the light according to the voltage value applied to the transparent dielectric material through the metal thin film and emitting the absorbed light through the metal thin film on the other side; A light quantity control emitting means for receiving the selected light and controlling the output light quantity of the incident selected light in accordance with a voltage value applied to a transparent dielectric material through the metal thin film; And a color selection light amount adjusting device. 6. The color-selecting transmission means includes: a light-incident-side transparent dielectric substrate, a metal thin film,
A transparent dielectric material, a metal thin film, and a light emitting side transparent dielectric substrate, wherein the light quantity control emission means is a light incident side transparent dielectric substrate, a metal thin film arranged in order from the light incident side;
6. The color selection light amount adjusting device according to claim 5, comprising a transparent dielectric material, a metal thin film, and a light emitting side transparent dielectric substrate. 7. The transparent dielectric substrate on the light emission side in the color selection and transmission means and the transparent dielectric substrate on the light incidence side in the light quantity control emission means are shared. The color selection light amount adjusting device described in the above. 8. The color selection light amount adjusting device according to claim 5, wherein said transparent dielectric material comprises liquid crystal. 9. The image display screen according to claim 5, wherein pixels formed by laminating said color selective transmission means and light quantity control emission means are arranged in a matrix.
The color selection light amount adjusting device according to any one of the above. 10. A transparent dielectric material having a metal thin film formed on both sides thereof, and a light having a specific wavelength among light incident on an interface with the metal thin film formed on one side of the transparent dielectric material. A color-selective transmission means that absorbs according to the voltage value applied to the transparent dielectric material through the metal thin film and emits the absorbed light through the metal thin film on the other side, and transparent electrodes on both sides of the liquid crystal layer. Having the incident-side polarizer and the output-side polarizer, receiving the selected light, controlling the torsion of the liquid crystal molecules in the liquid crystal layer by an electric field, and controlling the output light quantity of the incident selected light. And a liquid crystal light valve. 11. The color selecting and transmitting means includes: a light incident side transparent dielectric substrate, a metal thin film, a transparent dielectric material, a metal thin film, and a light emitting side transparent dielectric substrate arranged in order from the light incident side. The color selection light amount adjusting device according to claim 10, wherein: 12. The color selection light amount adjusting device according to claim 10, wherein the transparent dielectric material is made of a liquid crystal. 13. The display screen according to claim 10, wherein pixels formed by laminating said color selection transmission means and a liquid crystal light valve are arranged in a matrix to form a display screen. Color selection light amount adjustment device.