JPH06242464A - Display device - Google Patents

Abstract

PURPOSE:To obtain a display device which obtains a display image having excellent gradation characteristics even if an aspect ratio or subscanning period varies. CONSTITUTION:Light information is made incident on a light-light converting element SLM constituted including a photoconductive layer member and an optical modulating material member while varied in light intensity in specific pattern corresponding to one or both of the aspect ratio of a source image signal and the scanning period of the source image signal to be displayed. Consequently, the display image can be projected with a light output which is free from nonlinear distortion in gradation characteristics even if the aspect ratio or subscanning period varies.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device.

[0002]

2. Description of the Related Art A light beam whose intensity is modulated by a time-series information signal is projected on a screen by a projection optical system,
A display device capable of displaying a two-dimensional image has been conventionally known. Further, in the above-mentioned conventional technique, a high-luminance, high-resolution optical 2 is used by using a time-series signal.
Even if it is required to form a two-dimensional image, for example, a high-definition two-dimensional image in which 4000 pixels are arranged in each of the vertical and horizontal directions in a state close to real time, a signal conversion element that can realize it Therefore, in order to solve the problem that such a requirement could not be satisfied, the applicant of the present invention previously radiated from a light source as disclosed in Japanese Patent Laid-Open No. 3-196121. The light flux having a linear cross-section is incident on the light modulator having a structure capable of displacing a large number of reflecting members provided for each pixel according to pixel information, and is incident on the light modulator at the light modulator. A light beam with a linear cross section is emitted as a light beam with a linear cross-sectional shape that is intensity-modulated for each pixel in the linear direction, and the light beam emitted from the above-mentioned light modulation unit is converted into a light beam by a rotating mirror car. The by deflected by incident on the projection lens in the horizontal direction at a predetermined cycle, it was proposed a display device which is adapted to Utsude a two-dimensional image by projecting the screen onto the screen by the projection lens.

However, in the above-mentioned proposed device, there is a problem that the light intensity modulation operation by the pixel information performed in the light modulator of the device is slow, and a solution thereof has been sought. Information of pixels corresponding to the respective light emitting elements is supplied to the N light emitting elements in the light emitting element array in which the N light emitting elements corresponding to the N pixels are linearly arranged. Then, the N light emitting elements in the above light emitting element array are caused to emit light at the same time for the above period, and the light emitting elements in the above light emitting element array are arranged in a direction orthogonal to the alignment direction of the light emitted from each light emitting element. The emitted light is deflected at the same time, and the deflected light includes at least a photoconductive layer member and a light modulation material layer member between two electrodes. Figure is imaged on the photoconductive layer, and the image information read from the optical over beam converter giving a readout light to the optical over light conversion element so as to out movies on the screen of 6
Proposed a display device as exemplified in.

In FIG. 6, REA is a light emitting element array in which N light emitting elements corresponding to N (N is a natural number of 2 or more) pixels are linearly arranged. The writing light emitted from the N light-emitting elements can emit light at the same time over a predetermined period with the emission intensity according to the information of N pixels on one straight line in the image to be displayed. It is done like this. When the image information to be displayed is supplied as a time-series image signal from the signal source of the image information to the display device, for example, it is output from the signal source of the image information. Information on N pixels in the time-series image signal is converted into a simultaneous signal by a serial / parallel conversion circuit (for example, a shift register) and then supplied to the light emitting element array REA.

The N light fluxes emitted from the N light emitting elements in the light emitting diode array REA in the state of being intensity-modulated by the information of N pixel elements are reflected by the lens L.
The light enters the optical deflecting device using the swing reflecting mirror Mg via.
Since the oscillating reflector Mg is oscillated in the direction of the arrow in the figure at a predetermined cycle (the sub-scanning cycle of the image signal), the oscillating reflector M
The above-mentioned light flux incident on g is repeatedly operated in the operation mode in which it moves at a constant moving speed from the top to the bottom of the light-light conversion element (spatial light modulation element) SLM to repeat the light-light conversion element SL.
The light is projected on M, and the light is imaged as writing light on the photoconductive layer member of the light-to-light conversion element SLM, and the image information to be displayed is written on the light-to-light conversion element SLM. Will be involved.

The above-mentioned light emitting element array REA is intensity-modulated by N pixel information on one straight line in an image to be displayed by N light emitting elements arranged linearly. The luminous flux is radiated for a predetermined period, but after the lapse of the predetermined constant period described above, another N lines on another straight line in the image to be displayed are displayed. A light flux whose intensity is modulated by pixel information is radiated over a predetermined period, and the intensity is modulated by N pieces of image information on different straight lines in an image to be displayed. Of the light, and the light of the light-to-light conversion element S
Bright writing light will be provided on the LM. As the light-to-light conversion element SLM used in the display device shown in FIG. 6, for example, as shown in FIG. 7, a transparent substrate BP1, a transparent electrode Et1, a photoconductive layer member PCL, a dielectric Even a so-called reflection type light-to-light conversion element which is configured by laminating the body mirror DML, the light modulation material layer member PML, the transparent electrode Et2 and the transparent substrate BP2, or a transmission type not shown. The light-to-light conversion element may be used.

The structure and operation of the light-light conversion element SLM described above will be described below with reference to FIG. The transparent electrode E described above in the light-light conversion element SLM
Each of t1 and Et2 is composed of a thin film of a transparent conductive material, and the photoconductive layer member PCL is composed of a material exhibiting photoconductivity in the wavelength range of light used. Further, as the dielectric mirror DML, a well-known type configured as a multilayer film so as to be able to reflect light in a predetermined wavelength band can be used, and further, as the light modulation material layer member PML, it is applied. An optical modulator that changes the state of light according to the electric field strength, for example, a crystal having an electro-optic effect, a liquid crystal exhibiting birefringence characteristics, and other optical modulator material layer members are used. Further, in FIG. 7, E is a transparent electrode E.
It is a power supply for applying a predetermined voltage between t1 and Et2.

WL in FIG. 7 is writing light which is incident from the substrate BP1 side in the light-to-light conversion element SLM and is condensed on the photoconductive layer member PCL, and this writing light WL is targeted for display. The intensity is modulated by the existing information.
Therefore, in the display device shown in FIG. 6, from the transparent substrate BP1 side in the light-to-light conversion element SLM in which a predetermined voltage is supplied from the power source E between the transparent electrodes Et1 and Et2,
When the N writing light fluxes whose intensity is modulated by the image information reflected by the oscillating reflecting mirror Mg are focused on the photoconductive layer member PCL by the lens L, the portions where the N writing light fluxes are focused are collected. The electric resistance value of the photoconductive layer member PCL of the photoconductive layer member PCL changes according to the amount of light irradiated.
At the boundary between L and the dielectric mirror DML, a charge image corresponding to the irradiation light quantity of the N writing lights whose intensity is modulated by the image information to be displayed is formed favorably, and Thus, the photoconductive layer member PCL and the dielectric mirror D are provided in the light modulation material layer member PML of the light-light conversion element SLM.
An electric field is applied by N charge images formed at the boundary with ML.

Reference numeral LS in FIG. 6 is a light source for the reading light, and the reading light RL emitted from the above-mentioned light source LS for the reading light.
Is incident on the polarization beam splitter PBS, the S-polarized light component of the read light RL is reflected by the polarization beam splitter PBS toward the read side of the light-light conversion element SLM, and the read side of the light-light conversion element SLM. Is incident from the transparent substrate BP2. As described above, the light-light conversion element SL
The read light RL incident from the transparent substrate BP2 side of M is shown in FIG.
As already described with reference to, the reflected light of the read light which reaches the dielectric mirror DML by the path of the transparent substrate BP2 → the transparent electrode Et2 → the light modulation material layer member PML → the dielectric mirror DML, The light is emitted from the light-to-light conversion element SLM along the route of the dielectric mirror DML → the light modulation material layer member PML → the transparent electrode Et2 → the transparent substrate BP2 →.

As described above, the N light fluxes of the reading light emitted from the light-to-light conversion element SLM at the same time are in the state in which the electric charges of the electric charges corresponding to the N sequential pixel information are arranged. Since the light flux is a light flux that travels back and forth through the light modulation material layer member PML to which an electric field due to a charge image is applied, the light flux changes the state of the polarization plane corresponding to the information of N sequential pixels arranged linearly. It is what you are doing. And
The N pieces of readout light emitted from the light-to-light conversion element SLM at the same time enter the polarization beam splitter PBS, and the P-polarized light component of the incident light is given from the polarization beam splitter PBS to the projection lens Lp at the same time. The projection lens Lp simultaneously projects it as N light spots linearly arranged on the screen S.

[0011]

Now, as described in many documents, various standard television systems that have been put into practical use (hereinafter, referred to as TV
The aspect ratio (ratio between the horizontal dimension and the vertical dimension of the screen) of the TV screen in (sometimes abbreviated as V) is the same as the screen of a movie that was already widely used before the TV technology was put into practical use. In order to match the ratio of the horizontal dimension and the vertical dimension of the motion picture film, the ratio of the horizontal dimension to the vertical dimension of the movie film is approximately 4 to 3, and the TV technology is defined as 4 to 3. As the aspect ratio of the display image in the applied display device, the aspect ratio of 4 to 3 is usually adopted. However, in recent years, as a result of various studies and additions made to various conditions such as the visual field of human beings, the amount of information that matches visual characteristics, and psychological effects, the aspect ratio of TV screens has been increased. Is better than the conventional 4 to 3, for example, the aspect ratio of the TV screen in high-definition TV, which is known as high-definition TV developed by the Japan Broadcasting Corporation in Japan, is 1
A larger aspect ratio, such as 6: 9, has been adopted as compared to the aspect ratio of 4: 3 of the conventional TV screen.

A reproduced image by the TV system in which the aspect ratio of the TV screen is set to be larger than the aspect ratio of the conventional TV screen, which is 4/3, has good matching with the human visual field and is easy to see.
Since it is natural and feels like a realistic and powerful screen, it is desirable to be able to see reconstructed images with a large aspect ratio, so it has been widely used until now. Considering the condition that good compatibility with the currently widely used TV system can be satisfied even in the development and research of the TV system that can obtain higher quality TV images compared to the various TV systems currently in use. At the same time, it is possible to know from the description of various published documents that the aspect ratio of the TV screen is being studied to be larger than the conventional aspect ratio of 4: 3. For the second-generation EDTV and other video package media, which are currently under intensive discussion with BTA related organizations, for example, the aspect ratio is 16: 9.
It is aimed at the direction of widening the screen.

Therefore, also in the display device, a display image having an aspect ratio of 4: 3 is displayed by an image signal of the scanning standard conforming to the scanning standard of the conventional TV system, or the aspect ratio is 16 as in the high definition.
It is necessary to be able to display the display image of the pair 9. By the way, the above-mentioned light-to-light converter S
In the case of changing the aspect ratio of the display image or changing the sub-scanning period in the LM while the light amount of the writing light WL supplied from the optical information source per unit time is kept constant. Changes the write light quantity per unit area supplied to the light-light converter SLM, so that the light quantity output from the light-light converter SLM exhibits a non-linear gradation characteristic. .

That is, the input / output characteristics of the light-light converter SLM show the relationship between the write light quantity and the output light quantity with respect to the unit area per unit time in the light-light converter SLM.
Since it has non-linearity as in the characteristic example of No. 3, the light amount of the writing light WL supplied from the optical information source per unit time to the light-to-light converter SLM is made constant as described above. When the aspect ratio of the display image is changed or the sub-scanning cycle is changed in this state, the gradation characteristics of the display image show non-linearity, and a good display image is obtained. A solution for it was sought because it would not be possible.

[0015]

DISCLOSURE OF THE INVENTION The present invention provides a light-light system in which optical information emitted from an optical information source is configured to include at least a photoconductive layer member and a light modulation material layer member between two electrodes. In the display device which is made to enter the conversion element, it is provided with means for changing the light intensity of the optical information emitted from the optical information source according to the aspect ratio of the original image signal to be displayed. And a light intensity of optical information emitted from an optical information source in the display device according to the above, depending on a scanning cycle of an original image signal to be displayed and an aspect ratio of the original image signal. And a swinging reflecting mirror for deflecting the light information linearly arranged in the main scanning direction in the sub-scanning direction orthogonal to the main scanning direction. Deflected by a mirror In a display device in which the generated light is made incident on a light-to-light conversion element including at least a photoconductive layer member and a light modulation material layer member between two electrodes, it is targeted for display. The aspect ratio of the original image signal to be displayed is defined by the rotational movement angle of the oscillating reflecting mirror that performs the reciprocating rotational movement at the oscillation period corresponding to the sub-scanning period of the original image signal. In accordance with the aspect ratio of the original image signal, the display device comprising the means for changing the light intensity of the optical information according to the aspect ratio of the original image signal, The aspect ratio of the original image signal to be displayed is defined by the rotational movement angle of the oscillating reflecting mirror that performs the reciprocating rotational movement at the oscillation period corresponding to the sub-scanning period of the original image signal. The means for changing according to It provides a display device comprising a means for changing in accordance with the light intensity of the optical information on the aspect ratio of the sub scanning period the original image signal of the original image signal described above.

[0016]

In the state where the light intensity of the light information emitted from the light information source is changed according to the aspect ratio of the original image signal to be displayed, at least the photoconductive layer member is provided between the two electrodes. The light intensity of the light information emitted from the light information source or incident on the light-to-light conversion element configured to include the light modulation material layer member is set as the aspect ratio of the original image signal and the display target. One of the scanning cycle of the original image signal,
Alternatively, in a state of being changed in a predetermined change mode depending on both, the light-to-light conversion element configured to include at least a photoconductive layer member and a light modulation material layer member between two electrodes is made incident. As a result, the light output in the state where there is no non-linear distortion in the gradation characteristics can be output from the light-light conversion element.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific contents of the display device of the present invention will be described in detail below with reference to the accompanying drawings. 1 and 2
Is a perspective view of an embodiment of the display device of the present invention, FIG. 3 is a block diagram of a part of the display device of the present invention, and FIG. 4 is a characteristic curve exemplifying the input and output light characteristics of the light-to-light conversion element. FIG. 5 is a curve diagram illustrating correction characteristics, FIG. 6 is a perspective view showing a configuration example of a display device, and FIG. 7 is a diagram showing a configuration example of a light-light conversion element. 1 and 2 showing a display device of the present invention.
In FIG. 6, the same reference numerals as those used in FIG. 6 are used for the components corresponding to the respective components in the display device described with reference to FIG. In FIG. 1 showing an embodiment of the display device of the present invention, N REAs are provided.
(However, N is a natural number of 2 or more) N corresponding to pixels
It is a light emitting element array in which (N is a natural number of 2 or more) light emitting elements are linearly arranged in the main scanning direction. In each figure, 1 is a signal source for generating an image signal to be displayed, and the image signal supplied from the signal source 1 to the light emitting element array REA causes the N light emitting elements to display an image. Light information corresponding to N pixels on one straight line in the main scanning direction in the image of interest is emitted.

When the image information to be displayed is a time-series image signal, the light emitting element array REA described above is used.
The light emitting element array REA by the image signal supplied to
In the case where the writing light emitted from the N light-emitting elements in is simultaneously emitted for a predetermined period, for example, N in the time-series image signal output from the image information signal source is used. The individual pixel information may be supplied to the light emitting element array REA after being converted into a simultaneous signal by a serial / parallel conversion circuit (for example, a shift register). The N light fluxes emitted from the N light emitting elements in the light emitting element array REA in the state of being intensity-modulated by the N pixel information are oscillating reflecting mirrors Mg for performing sub scanning via the lens L. Is incident on the optical deflecting device.

The N light fluxes that have entered the oscillating reflecting mirror Mg are reflected by the oscillating reflecting mirror Mg that is driven by the deflection driving unit 3 so as to perform reciprocating rotation operations in the sub-scanning direction. Thus, the sub-scanning is repeated in the operation mode in which the light-to-light conversion element SLM is moved from the top to the bottom at a constant movement speed, and the light-to-light conversion element whose configuration and operation have already been described with reference to FIG. The light is projected onto the SLM, and the light is imaged as writing light on the photoconductive layer member of the light-to-light conversion element SLM, and the light-to-light conversion element SLM is provided with the image information to be displayed. Written.

In the embodiment of the display device of the present invention shown in FIG. 2, the light emitting element array REA used in the display device described above with reference to FIG. 1 and the oscillating reflecting mirror Mg for performing the sub scanning are provided. A display device having a configuration in which the component portion including the deflection driving unit 3 for driving the oscillating reflecting mirror Mg is changed to a cathode ray tube CRT and a deflection yoke DY, and the control grid of the cathode ray tube CRT is , An image signal is supplied from a signal source 1 which generates a time-series image signal to be displayed, and a deflection control unit 2 supplies a deflection yoke DY with horizontal deflection (electrons in the main scanning direction). Beam scanning) and vertical scanning (electron beam scanning in the sub-scanning direction) are supplied with deflection power, and a cathode ray tube C is supplied with a time-series image signal to be displayed.
The light information of the display image displayed on the phosphor screen at RT is passed through the lens L as the writing light, and the light-light conversion element S is used.
The image information projected on the LM is formed on the photoconductive layer member of the light-light conversion element SLM, and the image information to be displayed is written in the light-light conversion element SLM.

Now, assuming that the width of the display image is the same,
Comparing the areas of the display image when the aspect ratio of the display image is 4: 3 and 16: 9, the area of the display image with the aspect ratio of 16: 9 is displayed with the aspect ratio of 4: 3. The display area is reduced by about 25% compared to the area of the image. Therefore, in order to obtain a display image having a good gradation characteristic when the aspect ratio of the display image is 4: 3, the correction of the gradation characteristic (see, for example, FIG. 4) of the light-light converter SLM is performed in advance. A display image having an aspect ratio of 16: 9 is generated by using the image signal performed by the non-linear auxiliary device 9 and the image signal subjected to similar gradation characteristic correction by the SLM non-linear auxiliary device 9. In the case where an attempt is made to obtain the light-to-light converter SLM, image information having a light amount of about 25% more per unit area is input, and therefore, especially in a display image in which a bright portion in the display image is collapsed. turn into.

The same problem as described above occurs in the display device shown in FIG. 1 by the swing reflecting mirror Mg which is driven by the deflection driving unit 3 so as to perform reciprocating rotary movement in the sub-scanning direction. 2, when the sub-scanning cycle for moving the optical information from the top to the bottom of the light-to-light conversion element SLM at a constant movement speed changes from 1/60 seconds to 1/50 seconds, for example, as shown in FIG. This also occurs when the vertical deflection cycle (sub-scanning cycle) of the cathode ray tube in the display device is changed from 1/60 seconds to 1/50 seconds, for example. That is, if the number of scanning lines and the scanning line interval of one image are the same when the sub-scanning cycle of the display image is 1/60 second and when the sub-scanning cycle of the display image is 1/50 second, When the sub-scan cycle of 1/50 second is larger than that in the case where the sub-scan cycle of the display image is 1/60 second, the amount of light per unit area is increased by about 20% and is input to the light-light converter SLM. Will be done. Therefore, the sub-scanning cycle of the display image is 1/6
In order to obtain a display image having a good gradation characteristic in the case of 0 second, the SLM nonlinear auxiliary device 9 has previously corrected the gradation characteristic of the light-to-light converter SLM (see FIG. 4, for example). The same gradation characteristic correction as the image signal is performed in S
The sub-scanning cycle performed by the LM nonlinear auxiliary device 9 is 1 /
If you try to get a display image like 50 seconds,
Since the image information with a light amount of about 20% more per unit area is input to the light-to-light converter SLM, a display image in which a bright portion in the display image is crushed is displayed.

In the display device of the present invention, in order to solve the above problems, the light intensity of the optical information emitted from the optical information source is changed to
Light-to-light conversion including at least a photoconductive layer member and a light modulation material layer member between two electrodes in a state of being changed according to an aspect ratio of an original image signal to be displayed. Depending on the aspect ratio of the original image signal and the scanning cycle of the original image signal to be displayed, or both, the light intensity of the optical information that is incident on the element or emitted from the optical information source is determined. The light-to-light conversion element S is configured to include at least a photoconductive layer member and a light modulation material layer member between two electrodes in a state of being changed in a predetermined change mode.
The light output can be output from the light-to-light conversion element in the state where there is no non-linear distortion in the gradation characteristics by making the light incident on the LM, and is emitted from the optical information source as described above. Changing the light intensity of the optical information according to the aspect ratio of the original image signal and the scanning cycle of the original image signal to be displayed, or both in a predetermined change mode. Can be realized by the circuit arrangement of the configuration mode illustrated in FIG. 3 provided in the signal source 1.

In FIG. 3, reference numeral 4 is an input terminal for an image signal to be displayed, and 5 is a vertical scanning period VD generated by a synchronization signal generator provided in the deflection controller 2.
A signal supply terminal, 6 is an input terminal for an aspect ratio instruction signal of a display image, 7 is an output terminal of the aspect ratio adjusting unit 10,
8 is an output terminal, 9 is an SLM non-linear corrector, 11 is an output adjustment control unit, 12 is an output adjustment multiplier, and the image signal sent from the output terminal 8 is the display device shown in FIG. In the embodiment described above, the light emitting element array REA is supplied, and in the embodiment of the display device shown in FIG. 2 described later, it is supplied to the control grid of the cathode ray tube CRT. The SLM nonlinear compensator 9 in FIG. 3 is an input / output characteristic shown in FIG. 5, for example (optical-optical converter S shown in FIG. 4).
An output signal in a state in which the gradation characteristic of the image signal to be displayed, which is supplied to the SLM nonlinear corrector 9 through the input terminal 4, is corrected. It is supplied to the output adjustment multiplier 12.

In the aspect ratio adjusting section 10, the display area in the case of the reference aspect ratio and the aspect supplied through the input terminal 6 are determined according to the aspect ratio instruction signal of the display image supplied to the input terminal 6. A signal indicating the ratio to the display area in the case of the aspect ratio indicated by the ratio instruction signal is generated and given to the output adjustment control unit 11 and to the deflection control unit 2 via the output terminal 7. give.
The deflection controller 2 generates a sub-scanning drive signal capable of changing the image width in the sub-scanning direction in a predetermined manner according to the signal supplied from the aspect ratio adjuster 10, and the display device shown in FIG. In the display device shown in FIG. 2, the sub-scanning drive signal is supplied to a vertical deflection circuit (not shown), and is determined by the sub-scanning drive signal. The vertical deflection power having the determined vertical deflection period is supplied to the deflection yoke DY of the cathode ray tube CRT.

In the output adjustment control section 11, the sub-scanning cycle is measured based on the signal VD of the vertical scanning cycle provided through the input terminal 5, and the measured sub-scanning cycle measurement value and Based on the two signals including the signal supplied from the aspect ratio adjustment unit 10 to the output adjustment control unit 11
The amount of light per unit area in the display image during the sub-scanning period,
The ratio with the light amount per unit area in the display image in the case of one reference sub-scanning period is calculated, an amplitude control signal of the image signal is generated based on the calculated value, and this is given to the output adjustment multiplier 12. . In the output adjustment multiplier 12, as described above, S
A signal obtained by multiplying the image signal supplied from the LM non-linear corrector 9 and the amplitude control signal of the image signal generated in the output adjustment control unit 11 is output from the signal source 1 via the output terminal 8. Let

As described above, in the display device of the present invention, the light intensity of the optical information emitted from the optical information source is changed in a predetermined manner according to the aspect ratio of the original image signal to be displayed. The light-to-light conversion element, which is configured to include at least the photoconductive layer member and the light modulation material layer member between the two electrodes, or is emitted from the optical information source. Between the two electrodes in a state where the intensity is changed in a predetermined change mode according to either or both of the aspect ratio of the original image signal and the scanning period of the original image signal to be displayed. The light output in the state where there is no non-linear distortion in the gradation characteristics is caused by entering the light-light conversion element SLM including at least the photoconductive layer member and the light modulation material layer member. Since it is possible to output from the element, The image information light from the light-to-light conversion element SLM is incident on the polarization beam splitter PBS, the P-polarized light component of the incident light is simultaneously given from the polarization beam splitter PBS to the projection lens Lp, and the projection lens Lp screens the light. The display image displayed on S always has good gradation characteristics even if the aspect ratio of the original image signal or the scanning cycle of the original image signal to be displayed changes. .

If the light-to-light conversion element SLM used in the display device shown in each of FIGS. 1 and 2 has the structure as described above with reference to FIG. In the writing light that is incident from the substrate BP1 side of the light conversion element SLM and is condensed on the photoconductive layer member PCL, the image information to be displayed corresponds to the image aspect ratio and the sub-scanning cycle. The intensity is modulated by the image information in a state where the correction is performed in a predetermined manner. Therefore, in the display device shown in FIGS. 1 and 2, from the transparent substrate BP1 side of the light-to-light conversion element SLM in which a predetermined voltage is supplied from the power source E between the transparent electrodes Et1 and Et2, the writing light flux described above is written. When the light is focused on the photoconductive layer member PCL by the lens L, the electric resistance value of the photoconductive layer member PCL at the portion where the writing light flux is focused changes according to the amount of the irradiated light and the photoconductive layer member PCL is changed.
At the boundary between the dielectric mirror DML and the dielectric mirror DML, a charge image corresponding to the irradiation light amount of the writing light intensity-modulated by the image information in the above-described corrected state is well formed,
Thereby, the light modulation material layer member PM of the light-light conversion element SLM
An electric field due to a charge image formed at the boundary between the photoconductive layer member PCL and the dielectric mirror DML is applied to L.

When the reading light RL emitted from the light source LS of the reading light is incident on the polarization beam splitter PBS, the S-polarized light component of the above-mentioned reading light RL is reflected by the polarization beam splitter PBS on the reading side of the light-light conversion element SLM. It is reflected in one direction and enters from the transparent substrate BP2 on the read side of the light-light conversion element SLM. As described above, the read light RL incident from the transparent substrate BP2 side of the light-light conversion element SLM.
As already described with reference to FIG. 7, the transparent substrate BP2 → the transparent electrode Et2 → the light modulation material layer member PML → the dielectric mirror DM.
The reflected light of the read light which reaches the dielectric mirror DML through the path of L and is reflected there is a light-to-light conversion element along the path of the dielectric mirror DML → the light modulation material layer member PML → the transparent electrode Et2 → the transparent substrate BP2 →. Eject from the SLM. Since the luminous flux of the reading light emitted from the light-to-light conversion element SLM as described above is the luminous flux that reciprocates through the light modulation material layer member PML to which the electric field based on the charge image is applied, the luminous flux is pixel information. The state of the polarization plane has changed corresponding to. Then, the readout light emitted from the light-to-light conversion element SLM is incident on the polarization beam splitter PBS, and the P-polarized light component of the incident light is given from the polarization beam splitter PBS to the projection lens Lp at the same time. Lp displays it on the screen S, but the display image displayed on the screen S has good gradation characteristics.

[0030]

As is apparent from the above detailed description, the display device of the present invention determines the light intensity of the optical information emitted from the optical information source by the aspect ratio of the original image signal to be displayed. In a state of being changed according to the ratio, the light is made incident on a light-to-light conversion element configured to include at least a photoconductive layer member and a light modulation material layer member between two electrodes, or emitted from an optical information source. The light intensity of the optical information, which is one of the aspect ratio of the original image signal and the scanning cycle of the original image signal to be displayed, or in a state of being changed in a predetermined change mode according to both, The light output in a state where there is no non-linear distortion in gradation characteristics by making the light incident on a light-to-light conversion element including at least a photoconductive layer member and a light modulation material layer member between two electrodes. Can be output from the light-to-light conversion element And than the easy, conventional problems described above, according to the present invention can be satisfactorily solved.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a display device of the present invention.

FIG. 2 is a perspective view of an embodiment of a display device of the present invention.

FIG. 3 is a block diagram of a part of the configuration of the display device of the present invention.

FIG. 4 is a characteristic curve example diagram illustrating input / output light characteristics of a light-light conversion element.

FIG. 5 is a curve diagram illustrating a correction characteristic.

FIG. 6 is a perspective view showing a configuration example of a display device.

FIG. 7 is a diagram showing a configuration example of a light-light conversion element.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Signal source, 2 ... Deflection control part, 3 ... Deflection drive part, 9 ... S
LM non-linear corrector, 10 ... Aspect ratio adjusting unit, 11 ...
Output adjustment control unit, 12 ... Output adjustment multiplier, REA ... Light emitting diode array, Mg ... Oscillating reflector, SLM ... Light-light conversion element (spatial light modulation element), BP1, BP2 ... Transparent substrate,
PCL ... Photoconductive layer member, DML ... Dielectric mirror, PML
... light modulation material layer member, Et2, Et2 ... transparent electrode, LS ... read light source, PBS ... polarization beam splitter, E ... power supply,

Front page continuation (72) Inventor Yuji Uchiyama 3-12 Moriya-cho, Kanagawa-ku, Yokohama, Japan Victor Company of Japan, Ltd. (72) Inventor Hiroshi Katsumata 3-12 Moriya-cho, Kanagawa-ku, Yokohama Japan Victor Co., Ltd.

Claims (4)

[Claims] 1. Light information emitted from an optical information source is made to enter a light-to-light conversion element which is configured to include at least a photoconductive layer member and a light modulation material layer member between two electrodes. In the display device, the display device is provided with a means for changing the light intensity of the optical information emitted from the optical information source according to the aspect ratio of the original image signal to be displayed. 2. The light information emitted from the light information source is made to enter a light-to-light conversion element including at least a photoconductive layer member and a light modulation material layer member between two electrodes. In the display device, means for changing the light intensity of the optical information emitted from the optical information source according to the scanning cycle of the original image signal to be displayed and the aspect ratio of the original image signal. A display device comprising: 3. A swing reflecting mirror for deflecting light information linearly arranged in the main scanning direction in a sub-scanning direction orthogonal to the main scanning direction is deflected by the swing reflecting mirror. A display device in which light is allowed to enter a light-to-light conversion element including at least a photoconductive layer member and a light modulation material layer member between two electrodes, and is a display target. According to the aspect ratio of the original image signal to be displayed, the rotational movement angle of the above-described oscillating reflecting mirror, which performs the reciprocating rotational movement at the oscillation cycle corresponding to the sub-scanning cycle of the original image signal, is determined. And a means for changing the light intensity of the optical information according to the aspect ratio of the original image signal. 4. An oscillating reflecting mirror for deflecting light information linearly arranged in the main scanning direction in a sub-scanning direction orthogonal to the main scanning direction is provided, and is deflected by the oscillating reflecting mirror. A display device in which light is allowed to enter a light-to-light conversion element including at least a photoconductive layer member and a light modulation material layer member between two electrodes, and is a display target. According to the aspect ratio of the original image signal to be displayed, the rotational movement angle of the above-described oscillating reflecting mirror, which performs the reciprocating rotational movement at the oscillation cycle corresponding to the sub-scanning cycle of the original image signal, is determined. And a means for changing the light intensity of the optical information according to the sub-scanning cycle of the original image signal and the aspect ratio of the original image signal.