KR950014548B1 - Display unit - Google Patents

Abstract

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Description

High resolution display unit

The present invention relates to a high resolution display unit using a light-to-light conversion element, and more particularly to a high resolution display unit suitable for use in an optical computer.

(Explanation of related technology)

Various display units are known in which a light beam whose intensity is adjusted by a time sequentlal information signal is projected onto a screen by a projection optical system to display a two-dimensional image.

In the conventional display unit, the optical signal whose intensity is adjusted by each pixel information included in the image signal is scanned in the horizontal and vertical directions. With this arrangement, when a high intensity and high resolution optical two-dimensional image such as a 4000 × 4000 pixel arranged in a matrix, i.e., a high-definition two-dimensional image composed of pixels, must be formed in near real time by using a time sequential signal, a conventional display unit is a suitable signal. There was no conversion element to meet this requirement.

In view of the above problems, in the improved display unit proposed by the assignee, the cross-sectionally linear beam of 11ight emitted from the light source can be provided to one pixel and be displaced according to the piece of pixel information. Projected onto a photo-modulator including many reflective members. The light beam incident on the light modulator is intensity-controlled by the pixels arranged in the longitudinal direction of the linear cross-sectional shape of the light beam, and then projected from the light modulator in the form of the cross-sectional linear intensity controlled light beam. The intensity modulated light beam then impinges on the rotating polygon mirror and is deflected in the horizontal direction by a predetermined period by this mirror. Subsequently, the deflected light beam is projected onto the screen by the projection lens to form a two-dimensional image on the screen (Japanese Patent Application No. 633,223, pending application on December 24, 1990). 1-337171).

The improved display unit is satisfactory in solving the problems associated with the conventional display unit described above, and can easily realize a high intensity, high definition image display, but the problem of relatively slow operation of the intensity modulation of the light performed by the optical modulator. have.

(Summary of invention)

In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a display unit capable of displaying an image at high resolution and high intensity without problems due to slow light intensity modulation of the light modulator.

Another object of the present invention is to provide a display unit which can process an optical image generated by a time sequential signal and an optical image generated from an information recording medium.

Another object of the present invention is to provide a display unit which is compact in size, can be easily manufactured at low cost, and can display color images without a problem of recording error.

A display unit according to the first aspect of the present invention is a light emitting element array composed of a plurality of linearly arranged light emitting elements each corresponding to one of the same number of pixels, wherein the light emitting element is a light beam according to an information piece assigned to the corresponding A light emitting element array capable of driving to emit light; Means for deflecting light beams emitted simultaneously from the light emitting elements in a direction perpendicular to the longitudinal direction of the light emitting element array; A light-to-light conversion element comprising two electrodes of opposite polarities and a light modulation layer and a light conducting layer disposed between these electrodes, the light-converting element being capable of forming an image when the light conducting layer is scanned with a deflected light beam. A light conversion element is provided.

According to a preferred embodiment, the display unit further comprises a zoom lens capable of continuously changing the magnification of the image formed in the photoconductive layer. The light emitting element array further comprises a microlens array overlying the linearly arranged light emitting elements.

The display unit according to the second aspect of the present invention is a plurality of light emitting element arrays each comprising a plurality of linearly arranged light emitting elements corresponding to one of the same number of pixels, which are arranged side by side with the light emitting elements arranged laterally from each other. A plurality of light emitting element arrays; Means for driving light emitting elements of each of the light emitting element arrays to simultaneously emit light beams for a predetermined period of time according to one of different columns of pixel information pieces assigned to corresponding pixels; Means for simultaneously deflecting the light beams emitted from each light emitting element array in a direction perpendicular to the longitudinal direction of the light emitting element array, and supplying different columns of pixel information pieces to the light emitting element array, while deflecting at a predetermined time period Means for continuously shifting the columns of the pixel information pieces in a direction opposite to the moving direction of the light beam caused by the deflection by the deflection means in synchronization with the deflection by the means; A light-to-light conversion element comprising two electrodes of opposite polarities, a light modulation layer and a photoconductive layer disposed between the electrodes, wherein the light-conductive layer is capable of forming an image when scanned with a deflected light beam. And a means for imaging the deflected light beam on the light conductive layer of the light-to-light conversion element.

A display unit according to a third aspect of the present invention is an array of three parallel spaced light emitting elements provided with three primary colors, wherein three parallel spaced light emitting elements each constituted by a plurality of linearly arranged light emitting elements corresponding to the same number of pixels. Means for driving respective light emitting elements of the light emitting element array to emit light beams simultaneously for a predetermined period of time according to the array and three different columns of corresponding columns of pixel information pieces, and a direction perpendicular to the longitudinal direction of the light emitting element arrays; Thereby deflecting the first polygonal mirror deflecting light beams simultaneously emitted from the first light emitting element array and the light beams simultaneously emitted from the second light emitting element array in a direction perpendicular to the longitudinal direction of the light emitting element array. A third polygon mirror; A third polygon mirror which deflects the light beams simultaneously emitted from the second one light emitting element array in a direction perpendicular to the longitudinal direction of the light emitting element array; Two electrodes of opposite polarity, and a light modulation layer and a light conducting layer disposed between the electrodes, which can form an image when the light conducting layer is scanned with a deflected light beam from the first array of light emitting elements. A first light-to-light conversion element, two electrodes of opposite polarity, and a light modulation layer and a light conducting layer disposed between the electrodes, the light conducting layer being deflected from a second array of light emitting elements. A second light-to-light conversion element capable of forming an image when scanned with a beam, and two electrodes of opposite polarities, a light modulation layer and a light conductive layer disposed between these electrodes, the light conductive layer being a third A third light-to-light conversion element capable of forming an image when scanned with a deflected light beam from a light-emitting element array, and from the first light-emitting element array through deflection means on a light conductive layer of the first light-to-light conversion element. First to image light beam A lens; A second lens for imaging the light beam from the second light emitting element array through deflection means on the light conductive layer of the second light-to-light conversion element; A third lens for imaging the light beam from the third light emitting element array through deflection means on the light conductive layer of the third light-light conversion element, and the color of each image formed in the first, second and third light-light conversion elements And a three color separation and synthetic optical system associated with the first, second and third light-to-light conversion elements to combine them and reproduce them as a composite color image.

According to a fourth aspect of the invention, there are provided three parallel-spaced light emitting element arrays provided in three primary colors, each consisting of a plurality of linearly arranged light emitting elements corresponding to the same number of pixels; Means for driving each of the light emitting elements to emit light beams simultaneously for a predetermined period of time according to three different columns of corresponding columns of pixel information pieces; and a light emitting element array in a direction perpendicular to the longitudinal direction of the light emitting element array. Means for deflecting a light beam emitted simultaneously from the light; Two electrodes of opposite polarity, and a light modulation layer and a light conducting layer disposed between the electrodes, which can form an image when the light conducting layer is scanned with a deflected light beam from a first array of light emitting elements. A first light-to-light conversion element; Two electrodes of opposite polarity, and a light modulation layer and a light conducting layer disposed between the electrodes, capable of forming an image when the light conducting layer is scanned with a deflected light beam from a second array of light emitting elements. A second light-to-light conversion element; Two electrodes of opposite polarity and a light modulation layer and a photoconductive layer disposed between these electrodes, which can form an image when the photoconductive layer is scanned with a deflected light beam from a third array of light emitting elements. A third light-to-light conversion element; A first lens for imaging the light beam from the first light emitting element array on the light conductive layer of the first light-to-light conversion element through deflection means; A second lens for imaging the light beam from the second light emitting element array through deflection means on the light conductive layer of the second light-light changing element; A third lens for imaging the light beam from the third light emitting element array through deflection means on the light conductive layer of the third light-light conversion element, and the color of each image formed in the first, second and third light-light conversion elements And a three color separation and composite optical system associated with the first, second and third light-to-light conversion elements for combining them and reproducing them as composite color images. In the case where the first, second and third light emitting element arrays, the first, second and third light-to-light conversion elements and the first, second and third lenses are disposed in separate planes, the display unit may be the first, second and third light emitting elements. And means for equalizing the length of the optical path between the array and the light conductive layer of the corresponding light-to-light conversion element.

According to a fifth aspect of the present invention, there is provided a light emitting element comprising three groups of longitudinally aligned light emitting elements corresponding to one of three columns of pixels of three primary colors and capable of emitting one light beam in three different wavelength regions. Means for driving a group of light emitting elements of a light emitting element array to simultaneously emit three groups of light beams of different wavelengths for a predetermined time period in accordance with a corresponding column of the pixel information piece; Means for deflecting a group of light beams simultaneously emitted from the light emitting element array in a direction perpendicular to the longitudinal direction of the light emitting element array; Two antipolar electrodes, a light modulation layer and a photoconductive layer disposed between these electrodes, which can form an image when the photoconductive layer is scanned with a light beam deflected from the first group of light emitting elements. A first light-to-light conversion element; Two electrodes of opposite polarity, a light modulation layer and a photoconductive layer disposed between these electrodes, which can form an image when the photoconductive layer is scanned with a beam of light deflected from a second group of light emitting elements. A second light-to-light conversion element; Two electrodes of opposite polarity, a light modulation layer and a photoconductive layer disposed between these electrodes, which can form an image when the photoconductive layer is scanned with a beam of light deflected from a third group of light emitting elements. A third light-to-light conversion element; Means for imaging a group of light beams from a corresponding group of light emitting elements via deflection means on a light conductive layer of the corresponding light-to-light conversion element; A three color separation and composite optical system associated with the first, second and third light-to-light conversion elements to combine the colors of each image formed within the first, second and third light-to-light conversion elements and to reproduce them as a composite color image; A display unit is provided.

According to a sixth aspect of the present invention, there is provided a first means for generating an optical image by a time sequential signal, a second means for generating an optical image by an information recording medium, and an optically recorded optical image for storing and storing A display unit is provided having at least one light-to-light conversion element for optically reproducing an image, and means for recording at least one optical image into the light-to-light conversion element.

According to a seventh aspect of the invention, there is provided a light emitting device array comprising a plurality of linearly arranged light emitting devices each corresponding to one of the same number of pixels; Means for driving the light emitting element to emit a light beam in accordance with an information piece assigned to the corresponding pixel; Means for deflecting light beams emitted simultaneously from the light emitting elements in a direction perpendicular to the longitudinal direction of the light emitting element array; A light-to-light conversion element comprising at least a light conductive layer and a light modulation layer; A color separation filter disposed on the read side of the light-to-light conversion element, having many groups of stripe-like filter elements each having at least three filter elements of different wavelength ranges corresponding to the desired color separation; A display unit is provided having means for controlling the relative position between the light emitting element array and the light-to-light conversion element to image the deflected light beam on the light conductive layer in accordance with the desired color separation.

According to an eighth aspect of the present invention, there is provided a light emitting device array comprising a plurality of linearly arranged light emitting devices each corresponding to one of the same number of pixels; Means for driving a light emitting element to emit a light beam in accordance with an information piece assigned to the corresponding pixel; Means for deflecting light beams emitted simultaneously from the light emitting elements in a direction perpendicular to the longitudinal direction of the light emitting element array; A light-to-light conversion element comprising at least a photoconductive layer and a light modulation layer, and including a dielectric mirror having many striped portions separated into at least three different wavelength regions corresponding to the desired color separation; Means for controlling the relative position between the light emitting element array and the light-to-conversion element to image the deflected light beam on the light conductive layer in accordance with a desired color separation; A light source for generating read light for reading out an image from the light-to-light conversion element; A display unit is provided having a projection optical system for designating read light from a light source on a light-to-light conversion element to project reflected light from the dielectric mirror layer onto a screen.

According to a ninth aspect of the present invention, there is provided an apparatus, comprising: a first color separation filter composed of a plurality of types of first filter elements capable of transmitting light beams having at least three different wavelength regions; It is composed of a plurality of types of second filter elements capable of transmitting light beams having different wavelength ranges, the number of the second filter elements being equal to the number of types of the first filter elements, and each type of the second filter elements. A second color separation filter paired with a corresponding one of the first filter element types; A light-to-light conversion element having at least a light conductive layer and a light modulation layer; A light emitting element array comprising a plurality of light emitting elements capable of emitting light beams of at least three different wavelength regions corresponding to the first color separation filter element, and a light beam according to an information piece assigned to the corresponding plurality of pixels Means for driving a light emitting element to emit light, and means for deflecting light beams emitted from each light emitting element in a direction perpendicular to the longitudinal direction of the light emitting element array; Means for imaging the deflected light beam on the photoconductive layer of the light-to-light conversion element, a light source for generating read light, and a light modulation layer for displaying an image on an enlarged scale by specifying read light from the light source to the light-to-light conversion element; And a projection optical system for projecting a light beam modulated from the screen to the screen, wherein the light conductive layer and the light modulation layer are paired groups of first and second filter elements facing each other. A display unit disposed in between is provided.

The above and other objects, features and advantages of the present invention will now be described in more detail with reference to the accompanying drawings, in which like reference characters correspond to like parts.

For example, REA represents a linear array of N pixels, that is, a light emitting element array composed of N light emitting elements corresponding to pixels, where N is a natural number greater than or equal to two. When multiple light emitting element arrays REA are shown in the same drawing, subscripts are added below the REA to distinguish each light emitting element array.

The light emitting element array REA includes various light emitting elements 6, such as light emitting diodes, semiconductor lasers, and the like, arranged in a straight line or a row on the substrate 5 as shown in FIG. The light emitting element array REA also includes a microlens array 7 superimposed on the light emitting element 6 as shown in FIG. The microlens array 7 thus provided increases the utilization of the light beams emitted from each light emitting element 6, and can record the image information in the light-light conversion element with only a small driving current.

The display unit shown in FIG. 1 includes a light emitting element array REA having N light emitting elements arranged linearly, the light emitting elements having an N pixel, i.e., an information piece assigned to the pixels, forming an image of a single straight line to be displayed. The light beam can be emitted for a predetermined time period at each intensity determined accordingly.

When the image information of the display image is supplied from the signal source to the display unit in the form of a time sequential image signal as briefly shown in FIG. 14, the N pieces of pixel information included in the time sequential image signal are converted into the signal source 4. Is converted into a simultaneous signal by the serial-to-parallel converter 8 and supplied to the light emitting element array REA to drive or excite the light emitting element. The serial-to-parallel converter 8 may be a shift register.

The N light emitting elements of the light emitting element array REA emit an N light beam whose intensity is adjusted by the N pieces of pixel information. The intensity adjusted N light beam is projected on the polygon mirror PM by the condenser lens L. Since the polygon mirror PM is rotated at a predetermined speed in the direction of the arrow shown in FIG. 1, the light beam impinging on the polygon mirror PM is used as the recording light of the light-light conversion element (spatial light modulator) SLM. Projected on the photoconductive layer, the information on the display image is recorded in the photo-conversion device (SLM). The display image information is read out from the light-light conversion element SLM and projected onto the screen S when the read light is applied to the light-light conversion element.

As illustrated in claim 16 also, the light-light conversion element (SLM) has a first transparent substrate (bP _1), the first transparent electrode (Et _l), the photoconductive layer (PCL), the dielectric mirror (DML), light lavatory The layer PML, the second transparent electrode Et ₂ and the second transparent substrate bP ₂ are stacked together in a predetermined order.

The first and second transparent electrodes Et _l and Et ₂ are thin films made of a transparent electrically conductive material. The photoconductive layer PCL is made of a material having photoconductivity in the region of the optical wavelength used. The dielectric mirror DNlL is a multi-layered film capable of reflecting light within a predetermined wavelength band. The phototransmutation layer (PML) consists of nematic liquid crystal (nematlc), lithium niobate, bismuth silicon oxide (bSO), lead lanthanum zirconate titanate (PLZT), high polymer-liquid crystal composite film, etc. Depending on the intensity, various states of light (polarization of light, rotation polarization and scattering) can be changed.

Electric power supply (E) and applies a predetermined voltage across the first and second electrodes _{(Et l), (Et 2} ). In FIG. 16, the power supply E is shown as an AC power source. However, a DC power source may be used depending on the material of the light modulation layer PML.

The recording light WL is projected onto the light-to-light conversion element SLM from the first substrate bP ₁ and is concentrated in the light conductive layer PCL. The recording light WL is intensity modulated in accordance with the displayed information.

In the display unit shown in FIG. 1, the recording light WL is composed of N light beams emitted from the N light emitting elements of the light emitting element array REA.

In operation, when a predetermined voltage from the power supply E is supplied across the transparent electrodes Et _l and Et2 of the light-to-light conversion element SLM, the recording light whose intensity is adjusted in accordance with the piece of information to be displayed ( The N beam of WL is projected onto the light-to-light conversion element SLM from the transparent substrate bP ₁ side. The N beam of the recording light WL converges on the photoconductive layer PCL through the transparent substrate bP ₁ and the transparent electrode Et _l , and at the same time, the electrical resistance of the photoconductive layer portion exposed to the recording light beam It changes with the irradiation amount of the recording light. With this change in electrical resistance, an N electrical charge image is formed at the interface between the photoconductive layer PCL and the dielectric mirror DML. Each N electric charge image thus formed is intensity-adjusted according to one corresponding piece of information to be displayed and corresponds to the amount of light emitted by one linearly arranged N beam of the recording light WL. The N electric charge image is a pattern of each electric charge having the same amount of charge as the corresponding pixel signal of one of the continuous pixel signals in the time sequential signal.

Since an N electric charge image is formed at the interface between the photoconductive layer PCL and the dielectric mirror DML, an electric field is generated and acts on the light modulation layer PML of the photo-light conversion element SLM.

When maintaining this state, the read light RL is projected onto the light-to-light conversion element SLM from the second transparent substrate bP ₂ side, while the read light RL is transparent substrate bP ₂ , transparent. Successively passing through the electrode Et ₂ and the light modulation layer PML impinges on the dielectric mirror DML. Thus, the read light is reflected by the dielectric mirror DML and exits out of the light-light conversion element SLM again through the light modulation layer PML, the transparent electrode Et ₂ and the transparent substrate bP ₂ .

Each of the N light beams returned from the light-to-light conversion element SLM moves back and forth before the light modulation layer PML, and the light modulation layer PML corresponds to one continuous piece of pixel information included in the time sequential signal. Since it is charged with the electric field generated by the N electric charge image, the N light beam is modified according to the associated piece of pixel information included in the time sequential signal.

When the material constituting the light modulation layer PML of the light-to-light conversion element SLM is capable of changing the scattering state of light passing according to the intensity of the electric field, the read light reflected back from the dielectric mirror DML may be used. The N beams are changed or modified according to the corresponding N consecutive pieces of pixel information in the respective time sequential signals.

When the material constituting the light modulation layer PML is in the form of changing the birefringence state or the deflection state of the light passing according to the applied electric field intensity, the N beam of the reflected read light has each deflection state or each deflection surface, This varies with the corresponding N consecutive pieces of pixel information of the temporal sequential signal. In the latter case, by passing through an analyzer (polarizing beam splitter PBS of the described embodiment), the N beam of reflected read light from the light-to-light conversion element SLM is such that each intensity of the light beam is included in the time sequential signal. It can be changed into a state that changes according to the corresponding continuous piece of pixel information.

In the case of the display unit shown in FIG. 1, the rotating polygon mirror PM has a light-light conversion element in which a predetermined voltage is supplied across two transparent electrodes Et _l and Et ₂ (Fig. 16) ( SLM) reflects the N beam of the recording light including the corresponding piece of the image information.

The N beam of the recording light impinges on the light-to-light conversion element SLM from the transparent substrate bP ₁ side, converges to the optical conductive layer, and at the same time, the electrical resistance of the optical conductive layer PCL portion radiated to each recording light beam. Changes with the radiation dose of light, forming an electrical charge image at the interface between the photoconductive layer (PCL) and the dielectric mirror (DML). Each electric charge image corresponds to the radiation dose of a corresponding one N beam of recording light that is intensity adjusted by the image information to be displayed. The electric charge image is composed of a pattern of respective electric charges with a charge amount corresponding to one N consecutive pieces of pixel information included in the time sequential signal.

Since an N electric charge image is formed at the interface between the photoconductive layer PCL and the dielectric mirror DML, an electric field is generated in the light modulation layer PML of the light-to-light conversion element SLM.

In FIG. 1, LS is a light source that projects the read light onto the polarization beam splitter PBS. The polarized beam splitter PBS inputs the S component of the deflected read light into the light-to-light conversion element SLM from the read side. As described with reference to FIG. 16, the read light continuously passes through the transparent substrate bP ₂ , the transparent electrode Et ₂ , and the light modulation layer PML and impinges on the dielectric mirror DML. The read light is then reflected by the dielectric mirror DML and exits from the light-to-light conversion element SLM via the light modulation layer PML, the transparent electrode Et ₂ and the transparent substrate bP ₂ .

Each N beam of read light returned from the light-to-light conversion element SLM moves back and forth to the light modulation layer PML, and the light modulation layer PML corresponds to one continuous piece of pixel information included in the time sequential signal. Since charged with the electric field generated by the electric charge image, the N beam of read light has each polarized surface that varies with a linearly arranged consecutive N pieces of pixel information.

The N beam of read light projected from the light-light conversion element SLM then moves into the polarized beam splitter PBS where the P component of the polarized incident light is sent to the projection range Lp. The projection lens Lp projects the polarized incident light P component on the screen S in a linearly arranged N spot form of light.

In the display unit shown in FIG. 1, the N light beams emitted by the N light emitting elements of the light emitting element array REA are intensity adjusted in accordance with the information pieces of the image to be displayed. By means of the intensity-adjusted N light beam, a single straight light composed of linearly arranged N spots of light is projected onto the light-to-light conversion element SLM for a predetermined period, thereby recording the information of the display image into the light-to-light conversion element. . Therefore, the light projection time assigned to each pixel is N times longer than the time of the conventional display unit, and the light whose intensity is adjusted by the time sequential signal including the piece of pixel information of the image to be displayed is horizontal and vertical by the deflector. Direction is deflected and sent to the light-to-light conversion element SLM to record pixel information. Thus, the write operation for the light-to-light conversion element SLM can be satisfactorily performed.

2, 3 and 4 show a display unit which is modified to display color images. For this purpose, such display units include a light emitting element array (REA) for each of the three primary colors, a light-to-light conversion element (SLM) for each primary color, and a three-color separation and composite optical system (cSA). The other components are almost the same as the display unit shown in FIG.

The display unit shown in FIG. 2 includes three light emitting element arrays REAr, REA _g and REA _b . The light emitting element array REA _r is configured to simultaneously receive N linearly arranged pieces of pixel information of a red image, and to emit light from an N light emitting element light beam whose intensity is adjusted according to the pixel information corresponding piece. Similarly, the light emitting element array REA _g is configured to simultaneously receive N straightly arranged N pieces of pixel information on a green image and to emit light from an N light emitting element light beam whose intensity is adjusted according to the corresponding piece of pixel information. Furthermore, the light emitting element array REA _b is configured to simultaneously receive N straight pieces of pixel information on a blue image and emit light from an N light emitting element light beam whose intensity is adjusted according to the corresponding piece of pixel information.

The light beam emitted from the light emitting element array REA _r is converged on the light-light conversion element SLM _r by the condensing lens L _r .

In addition, the light beam emitted from the light emitting element array REA _g converges on the light-light conversion element SLM _g by the condensing lens L _g .

In addition, the light beam emitted from the light emitting element array REA _b is converged on the light-light conversion element SLM _b by the condensing lens L _b .

The light projected from the condensing legs L _r is deflected in the vertical direction by the polygon mirror PMr. Similarly, the light projected from the condenser lens L _g is deflected in the vertical direction by the polygon mirror PM _g , and the light projected from the condenser lens L _b is deflected in the vertical direction by the polygon mirror PM _b . do.

In the display unit shown in FIG. 2, the three sets of optical systems are each provided with one of three primary colors, and each corresponding one light emitting element array REA _r , REA _g , REA _b , corresponding One condenser lens L _r , L _g , L _b , the corresponding one polygon mirror PM _r , PM _g , PM _b , and the corresponding one light-light conversion element SLM _r , SLM _g , SLM _b ). This optical system is structurally identical to the light emitting element array REA, the condenser lens L, the polygon mirror PM and the light-to-light conversion element SLM of the corresponding optical system of the display unit shown in FIG. Each optical system operates in the same way as the optical system of the display unit of FIG. 1, so that no further explanation is required.

In order to read pixel information from each of the light-to-light conversion elements SLM _r , SLM _g , and SLM _b , the light source LS projects the read light onto the polarizing beam splitter PBS, which alternately. The S component of polarized light is sent to a 3-color separation and composite optical system (cSA). The three-color separation and synthesis optical system (cSA) separates the S component of the polarized light into three beams of read light of different primary colors (red, green and blue), so that the corresponding light-to-light conversion elements SLM _r , SLM _g and SLM _b ) on the reading side.

The three-color separation and composite optical system (cSA) comprises two optical path complementary prisms (P _r ), (P _b ) and a dichroic prism (DP) in combination with a dichroic prism (DP). The read light arriving from the light-to-light conversion element SLM _r advances from one end face to the entire deflection surface M _r of the optical path complementary prism P _r . After deflection by the total deflection surface M _r , the read light is directed to the dichroic prism DP. At the same time, the read light arriving from the light-to-light conversion element SLM _b is advanced on one end face to the entire deflection surface M _b of the optical path complementary prism P _b , which is assumed to move into the dichroic prism DP. It is deflected by the deflection surface M _b . At the same time, the read light coming from the light-light conversion element SLM _g disposed in the same plane as the light-light conversion elements SLM _r and SLM _b is supplied directly to the dichroic prism DP. The dichroic prism DP performs a three-color combining or combining process to direct the light beam of the component color toward the projection lens Lp via the v polarization beam splitter. In this way, the projection lens Lp forms a color image on the screen S.

As described above, each recording optical system has separate polygon mirrors PM _r , PM _g , and PM _b provided for deflecting a light beam including image information of the corresponding one of the three primary colors.

The display unit shown in FIG. 3 is similar to the display unit of FIG. 2, but the intensity control beam of light emitted from the light emitting element array REA _r , the intensity control beam of light emitted from the light emitting element array REA _g , and the light emitting element Normal oscillation mirror GM (galvano-mirror) in which the intensity control beam of light emitted from the array REA _b alternates deflecting the three beams toward the corresponding light-to-light conversion elements SLM _r , SLM _g , SLM _b . ) Is different in that it is focused by the corresponding lens of the condenser lens L _r , L _g , L _b .

The use of a conventional galvano-maze (GM) (normally deflector) is provided with a light emitting element array (REA _r , REA _g , REA _b ) provided for three separate colors and a light-to-light conversion element provided for three separate colors (SLM). _r , SLM _g and SLM _b ) require that they can be arranged in two separate surfaces to equalize the length of the optical path in each recording optical system.

Since the operation of the display unit shown in FIG. 3 can be easily understood from the operation of the display unit described above with reference to FIG. 2, no further description is given.

The display unit shown in FIG. 4 differs from the display unit of FIG. 3 in that a single light emitting element array REA is vertically divided into three parts each having a group of light emitting elements arranged in a straight line. Each group of light emitting elements emits a light beam, the intensity of which is adjusted by one of the three separate primary color images. The light beam emitted from each part of the light emitting element array REA is projected onto a single oscillation mirror (galvano-mirror) GM by a single condenser lens L. The galvano-mirror GM deflects three different groups of light beams of different colors towards corresponding light-to-light conversion elements SLM _r , SLM _g , SLM _b arranged in a plane.

In order to display an image having the same resolution as that of the image formed by the display units shown in FIGS. 2 and 3, the number of light emitting elements of the light emitting element array REA is determined by each of the light emitting element arrays REA _r , REA _g , and REA. 3 times the number of light emitting elements in _b ). Each of the three divided vertical parts of the light emitting device REA may be configured as a single light emitting device array having the same number of light emitting devices as each part of the light emitting device array REA.

Since the operation of the display unit shown in FIG. 4 is easily understood from the description of the operation of the display unit shown in FIG. 2, no further explanation is made to avoid duplication.

5 shows the principle of the configuration and operation of the zoom lens Lz. The zoom lens Lz includes a first block lens 2 having a focal length f1 and a second block lens 3 having a focal length f2. The combined focal length of the two block lenses 2 and 3 (ie, the focal length of the zoom lens Lz) is given by the following equation.

f = f1 × f2 / (f1 + f2 -e)

Here, e is the distance between the main planes of the convex lenses 2 and 3. As is apparent from the foregoing, by moving the block lenses 2 and 3 relatively to change the distance e between the lenses, the focal length of the zoom lens Lz can be continuously varied.

The display unit shown in FIG. 6 is structurally identical to the display unit shown in FIG. 1 except that the zoom lens Lz is used instead of the condenser lens L. In FIG. The focal length of the zoom lens Lz is changed by the control signal generated from the single source 1.

FIG. 7 is the same as the structure of the display unit of FIG. 4 except for including the zoom lens Lz instead of the condenser lens L. FIG. This display unit comprises a signal source 1 for generating a control signal that changes the focal length of the zoom range.

By changing the focal length of the zoom lens Lz, the display unit of FIGS. 6 and 7 can change the size of the display image without changing the brightness of the display image. This zoom lens Lz has any suitable structure including two, three, four or five groups of known lens elements.

8 shows a display unit configured to increase the amount of recording light incident on the light-to-light conversion element SLM or the amount of light projected on the screen S. As shown in FIG. 9, 10A to 10C, and 11A to 11F show how the amount of recording light supplied to the light-to-light conversion element SLM or the amount of light on Sgreen S is increased.

The display unit shown in FIG. 8 includes a plurality of light emitting element arrays REA ₁ and REA ₂ (two of which are shown) including a G pixel or a pixel arranged linearly with the corresponding N light emitting element. The light emitting element arrays REA _l and REA ₂ are arranged side by side with N light emitting elements arranged laterally. The individual light emitting elements of each light emitting element array REA ₁ , REA ₂ simultaneously emit a light beam for a predetermined period of time at each intensity determined according to the individual pieces of pixel information of one of the sequential columns of pixel information pieces. The light beams thus emitted are simultaneously deflected in a direction perpendicular to the array direction of the light beams emitted from each light emitting element array (that is, a direction perpendicular to the longitudinal direction of the light emitting element array). This deflection is synchronized with the action, so that the column of pixel information used to excite the individual light emitting elements of each light emitting element array is supplied to the light emitting element array, which is in the opposite direction to the direction of light movement caused by the deflection action. It is continuously moved for a predetermined time period.

With this structure, the amount of light can be increased for the reasons described later with reference to FIGS. 9, 10a to 10c and 11a to 11f.

9 shows a linear example of the arrangement of a pixel array of a display image. The display image is composed of first to m arrays of pixels. Each pixel array is, for example, 11, 12, 13... ln, 21, 22, 23... 2n and 31, 32, 33... It includes N pixels arranged in columns as indicated by 3n. Each pixel array is formed when the linearly aligned light emitting elements of one light emitting element array are driven to emit light simultaneously for a predetermined period of time at respective intensities according to a corresponding piece of pixel information in a separate column of pixel information pieces. It consists of elements.

10A and 10C illustrate a light emitting element array REA _W composed of a plurality of light emitting element arrays REA _l , REA ₂ , REA ₃ ... Arranged side by side with light emitting elements of adjacent light emitting element arrays laterally aligned. Show the group. Each light emitting element comprises N pixels or pixels linearly aligned as described above and the corresponding N light emitting elements. In the N light emitting elements of each light emitting element array REA _l , REA ₂ , REA _{3 of the} light emitting element array group REAw, the pixel information S ₁₁ , S ₁₂ , S _l3,. S _ln , S _2l , S ₂₂ , S ₂₃ ,... S _2n to S _5l , S ₅₂ , S ₅₃ ,... N pieces up to S _5n are designated respectively.

S _ll , S _l2 , S ₁₃ ... S _ln to S ₅₁ , S ₅₂ , S ₅₃ . A piece of pixel information denoted by S _n is a pixel information piece of a temporal sequential signal arranged successively on a time base. A piece of pixel information having a larger subscript follows a pixel information piece having a smaller subscript.

The number of light emitting device arrays configured as the light emitting device array group REA _W is at least two, and the light emitting device array group REA _W shown in FIGS. 10A to 10C and 11A to 11F is illustrated for explanation. It consists of three arrays of light emitting elements REA _l , REA ₂ , REA ₃ .

10A to 10C, the light emitting elements of each light emitting element array simultaneously emit a light beam for a predetermined period of time at each intensity determined according to the corresponding piece of pixel information of one of the different columns of the pixel information pieces. Is driven to.

In particular, as shown in FIG. 10A, the N light emitting elements of the light emitting element array REA _l have pixel information S _ll , S ₁₂ , S ₁₃ ... It emits light beams simultaneously for a predetermined period of time according to the corresponding piece of _Sln . Similarly, the N light emitting elements of the light emitting element array REA ₂ are replaced with the pixel information S ₂₁ , S ₂₂ , S ₂₃ ... According to the corresponding piece of S _2n , the light beam is emitted simultaneously for a predetermined period of time. Further, the N light emitting elements of the light emitting element array REA ₃ have pixel information S ₃₁ , S ₃₂ , S ₃₃ ... According to the corresponding piece of S _3n , the light beam is emitted simultaneously for a predetermined time period.

When the predetermined time period has elapsed, the light emitting element array group REA ^w terminates its light emitting operation under the state shown in FIG. 10A, and the pixel information S _2l , S ₂₂ , S ₂₃ ... The next light emission operation is started under the state shown in FIG. 10B in which the N light emitting elements of the light emitting element array REA emit light simultaneously for a predetermined period of time according to the corresponding piece of S _2n .

Similarly, the N light emitting elements of the light emitting element array REA _b have the pixel information S ₃₁ , S ₃₂ , S ₃₃ ... According to the corresponding piece of S _3n it emits light simultaneously for a predetermined period of time. Further, the N light emitting elements of the light emitting element array REA ₃ have pixel information S ₄₁ , S ₄₂ , S ₄₃ ... According to the corresponding piece of S _4n , light is emitted simultaneously for a predetermined period of time.

When the predetermined time period has elapsed, the light emitting element array group REA ^w ends its light emitting operation under the conditions shown in FIG. 10B, and resumes the light emitting operation under the conditions shown in FIG. 10C.

As shown in FIG. 10C, the N light emitting elements of the light emitting element array REA _l have a predetermined time according to the corresponding pieces of pixel information S _3l , S ₃₂ , S ₃₃ ... S _3n of the first column of the pixel information piece. It emits light simultaneously during the cycle. Similarly, the N light emitting elements of the light emitting element array REA ₂ emit light simultaneously for a predetermined period of time according to the corresponding pieces of pixel information S ₄₁ , S _42, S ₄₃ ... S _4n of the second column of the pixel information piece. . Further, the N light emitting elements of the light emitting element array REA emit light simultaneously for a predetermined period of time in accordance with the corresponding pieces of pixel information S ₅₁ , S ₅₂ , S ₅₃ ... S _5n of the third column of the pixel information pieces.

As described above, each time a predetermined time period has elapsed, the column of the pixel information piece used to drive each of the light emitting element arrays REA _l , REA ₂ , and REA _{3 of the} light emitting element group REA ^w is generated by the deflector. It is continuously moved between adjacent light emitting element arrays in a direction opposite to the deflection direction of light.

The light beam emitted simultaneously from the light emitting elements of each light emitting element array REA _l , REA ₂ , REA _{3 of the} array group REA ^W is a direction perpendicular to the alignment direction of the light by the deflector (that is, the zero direction of the light emitting element array). Are deflected simultaneously. In this example, if the above-described movement of the light emission operation that continues for a predetermined time period is performed in synchronization with the deflection speed of light by the deflector, each piece of pixel information of the display image is three times (that is, the array group REA ^w ). Multiple times, such as the number of arrays of light emitting elements).

Each piece overlap of the pixel information of the display image will be described in more detail by creating FIGS. 11A to 11F.

11A to 11F, the pixels 11, 12, 13 to 81, 82, and 83 in Fig. 9 indicate the pixels corresponding to positions at pixel positions indicated by Figs. 11, 12, and 13 in Figs. In addition, reference numerals I _sl1 , I _s12 , I _s13 to I _s81 , I _s82 , and I _s83 denote light emitting elements when the light emitting elements are supplied as pieces of pixel information S ₁₁ , S ₁₂ , S ₁₃ ... S ₈₃ . Points to a piece of optical information emitted from.

FIG. 11A shows the optical information allocated to each pixel position of the display image when the light emitting element arrays REA _l , REA ₂ , and REA _{3 of the} array group REA ^W are supplied to the pieces of pixel information shown in FIG. 10A. The piece is shown. Similarly, in FIG. 11B, the optical elements assigned to respective pixel positions in the image when the light emitting element arrays REA _l , REA ₂ , and REA _{3 of the} array group REA ^W are supplied to the pieces of pixel information shown in FIG. Shows a piece of information. FIG. 11C also shows the optical information allocated to each pixel position of the image when the light emitting element arrays REA _l , REA ₂ , and REA _{3 of the} array group REA _w are supplied to the pieces of pixel information shown in FIG. 10C. The piece is shown. In addition, FIGS. 11D to 11f show the continuous change in the optical information piece position instead of the condition shown in FIG. 11c.

As is apparent from FIGS. 11A to 11C, the piece of optical information IS ₃₁ , IS ₃₂ , IS ₃₃ corresponding to the position of the same pixel ₃₁ , ₃₂ , _{33 in one} example is determined by the number of array groups REA ^w . A plurality of times (three times in the illustrated embodiment) are displayed. This is valid for the positions of the pixels 11, 12 and 13 or 41, 42 and 43.

In the case of the display unit shown in FIG. 8, the column of the pixel information pieces used to drive the light emitting elements of the two parallel light emitting element arrays REA _l and REA _{2 of the} array group REA ^W may be subjected to a predetermined time period. Are moved continuously. On the other hand, the light beam emitted from the light emitting elements of each of the two adjacent light emitting element arrays REA ₁ and REA ₂ is projected by the condensing lens L on the rotating polygon mirror PM. The polygon mirror PM simultaneously deflects the light beams in a direction perpendicular to the zero direction of the light emitting element array. In synchronism with the deflection of the light beam by the polygon mirror PM, the above-described movement of the columns of the pixel information pieces is performed, and the same pieces of pixel information of the display image are arranged in the light emitting element arrays REA _l , in the array group REA ^w . REA ₂ ) is directed to the light-to-light conversion element as the incident recording light in such a manner as to overlap the number of times ( _two in the illustrated embodiment).

As described above, the plurality of light emitting element arrays consisting of N pixels or pixels arranged in a straight line and the corresponding N light emitting elements are parallel to the N light emitting elements of one light emitting element array horizontally aligned with the N light emitting elements of the other light emitting element arrays. Is placed. The light emitting elements of each light emitting element array are driven to emit light beams simultaneously for a predetermined period of time at respective intensities determined according to the corresponding pieces of the combustion piece rows of pixel information. The light beam emitted from each light emitting element array is directed simultaneously in a direction perpendicular to the zero direction of the light emitting element array. In synchronism with the deflection of the light beam, the columns of the pixel information pieces supplied for driving the light emitting elements of each light emitting element array continuously move for a predetermined time period in a direction opposite to the direction of movement of the light beam caused by the deflection. do. With this arrangement, the amount of light projected on the screen S and the amount of light supplied as the recording light to the light-to-light conversion element SLM can be increased. Thus, when a plurality of low intensity light emitting elements are used, Can display bright or strong images on the screen. In addition, low intensity light-to-light conversion elements can be recorded by using a relatively low intensity light emitting element array.

The display unit shown in FIG. 12 is similar to the display unit shown in FIG. 3, but four deflection mirrors M1 to M4 are disposed between the light emitting element array REA _g and the common oscillation mirror (galvano mirror) GM. The length of the optical path extending in the optical path is arranged to equalize the length of the optical path extending between the light emitting element arrays REA _r , REA _b and the common galvano-mirror GM.

When the pixel information of the N pieces arranged in a straight line is simultaneously applied to the red image, the light emitting elements of the light emitting element array REA _r simultaneously emit light beams whose intensity is adjusted according to the corresponding pieces of pixel information. The light beam is projected by the condenser lens L _r on a common galvano-mirror GM and then deflected by this galvano-mirror. The deflected light beam is supplied to the light-light conversion element SLM _r as recording light.

Equally, when N pieces of linearly arranged pixel information are simultaneously applied to a blue image, the light emitting elements of the light emitting element array REA _b simultaneously emit light beams whose intensity is adjusted according to the corresponding pieces of pixel information. The light beam is projected by the condensing lens L _b on a common galvano-mirror GM and then deflected by this galvano mirror. The deflected light beam is supplied to the light-light conversion element SLM _b as recording light.

In addition, when the N pieces of linearly arranged pixel information are supplied to a green image, the light emitting elements of the light emitting element array REA _g simultaneously emit light beams whose intensity is adjusted according to the corresponding pieces of pixel information. The light beam is projected by the condensing lens L _g on the common galvano-mirror GM and then deflected by this galvano-mirror. The deflected light beam is supplied to the light-to-light conversion element via the first and second deflection mirrors M1 and M2 as recording light.

In each of the light-to-light conversion elements SLM _r , SLM _g , and SLM _b , the aggregated, focused optical conductive layer (PCL) portion of the light beam (see FIG. 16) changes its electrical resistance according to the amount of light irradiation. Accordingly, a pattern of charge, that is, an image, is formed at the boundary between the photoconductive layer PCL and the dielectric mirror DML. The amount of charge of the humming image corresponds to the amount of irradiation of the recording light whose intensity is adjusted by the image information in the corresponding color of the display image. The electric charge image thus formed generates an electric field acting on the light modulation layer of each light-to-light conversion element SLM _r , SLM _g , and SLM _b .

The light source LS sends the read light toward the polarizing beam splitter PBS via the lens Ll. The S component of the polarized light projected from the polarization beam splitter PBS to the dichroic prism DP acts as a three color separation and composite optical system.

The dichroic prism DP separates the incident read light into three read light beams having different colors (red, green, blue). The red beam of the read light is sent to the readout output side of the light-to-light conversion element SLM _r by the dichroic prism DP via the deflection mirror M6.

At the same time, the green beam of read light is sent to the readout output side of the light-light conversion element SLM _g by the dichroic prism DP via the deflection mirrors M4 and M3. Similarly, the blue beam of the read light is sent to the readout output side of the light-to-light conversion element SLM _b by the dichroic prism DP.

The read light from the light-to-light conversion element SLM _r is deflected by the deflection mirror M6 and moved to the dichroic prism DP.

Similarly, the read light from the light-to-light conversion means SLM _g is deflected by the deflection mirrors M3 and M4 to move to the dichroic prism DP. Similarly, the read light from the light-to-light conversion element SLM _g is deflected by the deflection mirrors M3 and M4 and continues to move to the dichroic prism DP. In addition, the read light from the light-to-light conversion element SLM _b is deflected by the funh mirror M5 and moved to the dichroic prism DP.

Each beam of read light incident on the dichroic prism DP is subjected to a three-color combination or synthesis, and then the P component of polarized light is projected from the polarizing beam splitter PBS toward the projection lens Lp, and this projection lens is again P By projecting the component onto the screen S, a color image appears on the screen S. FIG.

In the display unit shown in FIG. 12, the light emitting element arrays REA _r , REA _g , and REA respectively provided in one of the three primary colors are arranged in a plane, but by using the reflective mirrors M1 to M4, the light emitting element array The optical path extending between REA _g and the common galvano-mirror (GM) and the length of the optical path extending between each light emitting element array (REA _r , REA _b ) and the common galvano-mirror (GM) It is possible to reduce or eliminate the difference between them.

17 to 25 show various types of display units configured to use an information recording medium as a second image forming means or source in addition to a first image forming means composed of a light emitting element array.

The display unit shown in FIG. 7 includes a deflection mirror 16, an image forming lens 14, and an information recording medium 12 arranged in the output optical path of the light emitting element array 10, in addition to the elongated light emitting element array 10. In FIG. It includes. In this arrangement, the image information recorded on the information recording medium 12 is projected onto the light-to-light conversion element 18.

The read light from the light source 20 is input to the light-to-light conversion element 18 via the polarization and the divider 22. The projection lens 24 and the screen 26 are disposed in the output optical path of the polarization beam splitter 22.

The light emitting element array 10 includes a plurality of LEDs, EL, LD or other light emitting elements or devices arranged in a straight line at a high density. The information recording medium l2 may be any material capable of modulating incident light in accordance with the recording information. Examples of such materials are polymer-liquid crystal composite films, PLZTs, 35 mm films for cameras, 70 mm films and the like.

In the illustrated embodiment, the information recording medium 12 is in the form of a continuously extending film and is adapted to be conveyed in the direction of the arrow FA by a suitable conveying means, not shown. The conveyance of this information recording medium 12 is performed in accordance with the scanning of the straight light beam by the deflection mirror 16.

The light-light conversion element 18 includes a light conductive layer and a light modulation layer. When the photoconductive layer is exposed to light, its resistance changes according to the intensity distribution of incident light. In accordance with the change in the resistance value, the light modulation layer modulates the read light. The modulated light is deflected from the light-light conversion element 18 and output. With this light-to-light conversion, the intensity of the read light can be increased even when the light incident on the photoconductive layer is weakened.

The display unit of the above-described structure operates as follows. If the source of the displayed image is a time sequential signal, the information recording medium 12 is no longer needed and is removed, and the time sequential signal is supplied to the light emitting element array 10 from the output side of the display unit. The following operation is actually the same as the operation of the display unit shown in Fig. 1, and no further explanation is given.

If an image forming source is given in the form of the information recording medium 12, the information recording medium 12 is set on the light emitting element array 10 as shown in FIG. 17, and the light emitting element array 10 is subsequently discharged completely. It is driven in the state. In this example, the deflection mirror 16 is rotated to coincide with the forward movement of the information recording medium 12 in the direction of the arrow FA, so that one piece of information recorded on one frame of the information recording medium 12 is light. Projected onto the light conversion element 18;

The image information recorded in the light-light conversion element 18 is read out in the following manner. The read light from the light source 20 travels in the direction of the arrow FB and impinges on the polarizing beam splitter 22, the read light of which changes its optical path and moves to the light-light conversion element. After being modulated by the light-to-light conversion element according to the recorded image information, the read light is reflected back toward the polarization beam splitter 22. The modulated light passes through the polarization beam splitter 22 as indicated by arrow FC, then passes through the projection lens 24 as indicated by arrow FD, and is finally projected onto the screen 26. The video information recorded on the information recording medium l2 is displayed on the screen 26 in this way.

When the recorded image information is displayed in the form of a still image, the desired form of the information recording medium 12 is returned by the information recording medium 12 by one frame during the gap between the desired frame and the next frame, or by the desired projection. By supplying the information recording medium 12 upon completion, it is repeatedly projected onto the light-to-light conversion element 18, and at the same time, the deflection mirror 16 is rotated in the reverse direction without space.

As described above, by using the light-light conversion element 18, image information given in various forms can be displayed strongly even when the output light from the light emitting element array 10 is weakened.

The display unit shown in FIG. 18 is similar to the display unit shown in FIG. 17, but differs in that it displays a color image. To this end, the information recording medium 30 has different colors R, G projected onto the corresponding light-to-light conversion elements 32R, 32G, 32B as described above in connection with the above-described embodiment shown in FIG. , B) (red, green, and blue) images have three columns. The color separation prism 34 and polarization beam splitter 22 are disposed in the read light output optical path of the light-light conversion elements 32R, 32G, 32B. In addition, the light source 20 and the projection lens 24 are hatched as in the above-described embodiment shown in FIG. The color projection system 36 is thus constructed

The display unit of the above-described configuration operates as follows. The images of the different columns R, G, and B on the information recording medium 30 are subjected to the corresponding light as indicated by the arrow FE by the action of the light emitting element array 10, the image forming lens 14, and the deflection mirror 16. Projected onto the light conversion elements 32R, 32G, 32B. On the other hand, the read light from the light source 20 is subjected to color separation by the color separation prism 34 and then input to the light-light conversion elements 32R, 32G, and 32B. Images of different colors R, G, and B are read out by the corresponding color beams of light, then synthesized by color separation prism 34, and finally output to the screen 26. In this way, different color images R, G, and B on the information recording medium 30 appear on the screen 26 as a composite color image.

The displayJ unit shown in FIG. 19 is similar to the display unit shown in FIG. 18 configured to display color images. However, in this display unit, the image information is read out from the information recording medium 40 by the light source 42 other than the light emitting element array 10. The information recording medium 40 is a format for storing image information pieces of different colors R, G, and B in the form of charged images. The image information must be converted to an optical image for reading. For this purpose, the display unit comprises a playhead 44 comprising light modulation means.

The optical image of the separate colors R, G, B read out from the information recording medium 40 is projected onto the transflective mirror 48 via an appropriate image forming lens 46 and then by the transflective mirror to produce a color projection system. (36) is reflected in.

On the other hand, the linear light beam emitted from the light emitting element array 10 is reflected by the deflection mirror 16 and is projected onto the transflective mirror 48 and again to the color projection system 36.

The display unit shown in Fig. 20 is used as an information recording medium such as a 35 mm film having an optical image that is not separated into images of different primary colors R, G, and B. For this purpose, the display unit comprises a color separation prism 52 which forms an optical image of different colors R, G and B. The color images R, G, and B are separated in this way and travel in the direction of the arrow FF toward the transflective mirror 48 (see FIG. 19), and are subjected to a color projection system subjected to light-to-light conversion processing and color combining or combination processing ( 36) (see Figure 19).

The display unit shown in FIG. 19 transflects an image from the information recording medium 40 and an image from the light emitting element array 10.

If the image from the information recording medium 50 is as shown in Fig. 21A, and the image from the light emitting element array 10 is as shown in Fig. 21B, then the composite image is shown in Fig. 21C. Appear on screen 26.

Synthetic images formed by superposition are often not obvious, mainly due to the overlap of the images. By avoiding this, as shown in FIG. 22, a mask 60 is placed on the information recording medium 40 to block each piece portion (lower right portion in the illustrated embodiment) of the image. The image from the information recording medium 40 is masked by the mask 60 provided in this way in the lower right portion as shown in FIG. 23A.

If the image from the light emitting element array 10 is as shown in FIG. 23B, the composite image shown in FIG. 23C appears on the screen. According to this embodiment, the two images are combined together but do not overlap each other. Therefore, the synthesized image is easy to see and clear.

The display unit shown in FIG. 24 includes a color separation filter 72 and a light-light conversion element 70 connected to the light-light conversion element 70. The color separation filter 72 is composed of a plurality of group rows of fine striped color filter elements, and each color filter element group is composed of red (R), green (G), and blue (b) filter elements. The information recording medium 74 includes recorded images of separate primary colors R, G, and B corresponding to the colors of the R, G, and B filter elements of the color separation filter 72.

The image information read out from the information recording body 74 by the output light from the light source 42 impinges on the transflective mirror 48 and is reflected by the transflective mirror toward the information recording medium 70. Image information incident on the light-to-light conversion element 70 is recorded by the light-to-light conversion element 70 in which the images of the separation colors R, G, and B correspond to the corresponding color filter elements of the color separation filter 72. do.

The read light is projected onto the light-light conversion element 70 from the light source 20. In this example, the read light leaf is separated into three different primary color R, G, B light beams by the color separation filter 72 before reaching the light modulation layer of the light-light conversion element 70. In this way, the R, G and B beams of the read light are modulated equivalent to the corresponding color images R, G and B, and are subsequently reflected back to the screen 26.

On the other hand, a time sequential signal corresponding to the arrangement of the R, G, B filter elements of the color separation filter 72 is input to the light emitting element array 10, and as a result, the light emitting element array 10 is driven so that R, G, Emits a light beam corresponding to an array of B filter elements. The light beam is deflected by the polygon mirror 76 to scan the light-to-light conversion element 70. Subsequent operations are performed in the same manner as operations on images on the image recording medium 74.

According to this embodiment, the color separation prism is no longer needed, and accordingly the overall size of the display unit can be reduced.

The display unit shown in FIG. 25 differs from the display unit of the above-described embodiment in that the light-light conversion element is a transmissive type rather than a reflective type.

The display unit includes a beam splitter 80 arranged on the output side of the deflection mirror 16. The light source 82 sends the read light onto the beam splitter 80 via the polarizer 84 as indicated by arrows FG and FH. The transmissive light-light conversion element 86 is disposed on the output side of the beam splitter 80, and the analyzer 88 is disposed on the output side of the light-light conversion element 86.

The beam splitter 80 is a dichroic mirror when the recording light and the reading light are distinguished from each other according to the wavelength difference. When the recording light and the reading light are distinguished according to the difference in the polarization plane, the beam splitter is a polarizing beam splitter.

The display unit of the above-described structure operates as follows. Video information on the information recording medium 12 is read out in the same manner as is done in the embodiment shown in FIG. The recording light travels through the beam splitter 80 and impinges on the light-to-light conversion element 86.

In order to read out and output the image information, the read light is further applied by the light source 82 in the direction indicated by the arrow FG before the read light reaches the beam splitter 80 and the read light is a predetermined polarized light by the polarizer 84. Will receive. The polarized read light is reflected by the beam splitter 80, travels to the light-to-light conversion element 86, and is modulated there. The modulated read light proceeds to analyzer 88. The analyzer functionally corresponds with the polarizer such that only the read light passes through this analyzer 88. Subsequent operations are performed as in the above-described embodiment, and thus will not be described further.

The reflection type light-to-light conversion element incorporated in the display unit shown in Figs. 18, 19 and 24 can be replaced by the above-mentioned transmission-light conversion element. In this example, however, the means for combining the recording light and the reading light and the reading light source should be disposed on the recording light input side of the light-light conversion element.

In the embodiment shown in Figs. 17 to 25, a time sequential signal is applied to the light emitting element array. The light emitting element array can be replaced by a combination of a shutter array such as liquid crystal and an appropriate light source. In the case of the shutter array, the opening and closing operation of the shutter array occurs under the control of the time sequential signal. When the information recording medium receives light, the shutter array is placed in a fully open state. Also, the information recording medium may be provided in the form of a card, a disk, or the like, which are not described above. Representative propositions of such information recording media are described in Japanese Patent Application No. 2-100815 filed by the assignee. The application also discloses a conventional method of recording, retaining and reproducing information including color images and color separation filters.

26 to 43 show various types of display units, wherein the light beams emitted from the plurality of light emitting elements of the light emitting element array are arranged in a single planar light-to-light conversion element having a plurality of groups of separation regions of at least three different wavelength bands. According to the information piece to be recorded, it is modulated and deflected and recorded in the light-to-light conversion element, wherein the light beam emitted from the light emitting element is controlled to coincide with the corresponding area on the read side.

The display unit shown in FIG. 26 includes a light-light conversion element 10l having a recording surface 127. Multiple light sensors (six in the illustrated embodiment) 126a through 126f are arranged along both edges of the recording surface 127. The first position adjuster 125a is connected to a central portion of one side of the elongated light emitting device array 120 to adjust (or correct) the position of the light emitting device array 120 in its transverse direction (Y-direction). The second position adjuster 125b is connected to one end of the elongated light emitting device array 120 to adjust (or correct) the position of the light emitting device 120 in its longitudinal direction (x-direction). Both ends of the light emitting elements 119 of the light emitting element array 120 are configured to emit light beams, which in turn are used as an optical position control signal for a pair of vertically aligned optical sensors 126a to 126c and 126d to 126f. ) Projected on heat. The photosensors 126a to 126f convert the optical position control signal into an electrical position control signal in accordance with the intensity of the incident light. The electrical position control signal indicates the focusing adjustment and alignment of the light beams for each light sensor 126a to 126f. This electrical position control signal is returned to the position adjusters 125a and 125b to correct the match between the light emitting element array 120 and the light-to-light conversion element 101. With this position adjustment, the information recording operation can be performed accurately.

The light-to-light conversion element 101 includes at least a photoconductive layer and a light modulation layer as described later. The position adjusters 125a and 125b are equipped with stepping motors, piezoelectric elements, and the like, to finely adjust the position of the light emitting element array 120 to correct the focus on the recording surface 127 of the light-to-light conversion element 101. It works. The position adjusters 125a and 125b are also connected with the oscillation mirror 122, the image forming lens L _l , the light-to-light conversion element 101, or a combination thereof, so that the light emitting element array 120 and the light-to-light conversion element are combined. The relative position between the 101 is finely adjusted. The adjustment can optionally be carried out when the display unit is operating or via an information recording operation. In the latter case, the position control signal is superimposed on the information signal.

As shown in FIG. 31C, the light-to-light conversion element 101 includes a light conductive layer 112, a light modulation layer 113, a dielectric mirror 114, a first and a second transparent substrate (supporting agent) ( 115a) 115b, including first and second transparent electrodes _El and E ₂ made of phosphorus-tin oxide (ITO), and color separation filter f ₂ (hereinafter referred to as "color filter"). do. All elements of the light-light conversion element 101 are stacked together in the manner shown. In particular, the color filter f _{2 is} arranged between the light modulation layer 113 and the second electrode E ₂ so that the color filter f ₂ is arranged on the readout side of the light-to-light conversion element 101. do. The dielectric mirror 114 may be omitted when the light-to-light conversion element 101 is transmissive. In addition, the color filter f ₂ may be substituted with a dielectric mirror 114 having reflective characteristics corresponding to the color separation characteristics. The last mentioned dielectric mirror 114 is combined with the color filter f ₂ to constitute the light-light conversion element.

In FIG. 26, reference numeral 128 is a beam splitter, 129 is a screen, K ₁ is a light source for reading light, and L ₃ is a projection lens.

The display unit shown in FIG. 27 includes a deflector 121 for deflecting a light beam emitted from the light emitting element 119 of the light emitting element array 120 and a first color stacked together with the light-light conversion element 102. A light-to-light conversion element 102 having a filter f _l (FIG. 30) and a second color filter f ₂ . The color filters f ₁ and F ₂ include a row of a plurality of fine vertical striped filter elements that are equal in number to the light emitting elements 119. The light beam emitted from the light emitting element 119 of the light emitting element array 120 has a wavelength equivalent to the filtering characteristic of the corresponding filter element of the first filter f _l arranged on the recording surface of the light-light conversion element 102. Have

After deflection by the deflector 121, the light beam is recorded in the light-to-light conversion element 102. The information (video) reading operation is performed in the same manner as the embodiment shown in FIG. 26, and will not be described any further.

As shown in FIG. 30, a plurality of optical sensors (four in the illustrated embodiment) 126a to 126d adjust the relative position between the light emitting element array 120 and the light-to-light conversion element 102. On each corner of the recording surface 127 of the light-to-light conversion element 102 to ensure an accurate recording operation. The position adjustment can be performed by appropriately driving the first and second position adjusters l25a and 125b connected to two adjacent surfaces of the light-to-light conversion element 102, as shown in FIG.

As shown in FIG. 31A, the light-to-light conversion element 102 is formed by the light conductive layer 112, the light modulation layer 113, and the dielectric mirror 114 (when the light-to-light conversion element 102 is a transmissive type. The first and second transparent substrates 115a and 115b and the first and second transparent electrodes E _l and E ₂ and the first and second color filters f _l and F ₂ ).

Color filter f ₂ and dielectric mirror 114 may be replaced with dielectric mirror 114 ′. The dielectric mirror 114 has reflective characteristics corresponding to the color separation pattern (array of filter elements) of the color filter f ₂ and constitutes a part of the light-to-light conversion element 103. Dielectric mirror 114 ′ can be used in combination with color filters f ₁ , F ₂ of the light-to-light conversion element.

The color filter f _l on the recording surface has a wavelength determined in consideration of the light emission characteristics of the light emitting element 119 and the sensitivity of the photoconductive element constituting the color filter f _l . Heongsik three primary colors as the second color filter of the reading side is shown in Figure 31a when the respective photoconductive elements of the recording the first color filter (f _l) of the area has a different band pachang α, β, γ. The filter elements of the first color filter f _l and the filter elements of the filter f ₂ are arranged in pairs. The light modulation layer 15 may be a twisted nematic (TN) liquid crystal, a ferroelectric liquid crystal, a polymer liquid crystal composite film, an optoelectronic crystal, lead lanthanum zirconate titanate (PLAT), and the like, and have birefringence, rotation polarization of light, and scattering effect of light. Can be used.

The wavelength band separation for coping with the color display is realized in the form of the area separation of the reading surface in a predetermined manner. In practice, region separation is achieved by providing a color filter f ₂ on the readout side of the light-to-light conversion element 102, or by reflecting characteristics of the dielectric mirror 114 '(FIG. 31B) with the color separation pattern. Is executed by matching. Representative examples of color filter F (f ₁ , F ₂ and F ₃ ) separation are shown in FIGS. 32a and 32b. When the color filter F is separated into rows of vertical stripe filter element groups R, G, and B extending in a direction parallel to the beam scanning direction of the recording light indicated by the arrows in FIG. 32A, each light emission of the light emitting element array 120 The element is positioned with the filter elements R, G, and B as shown in FIG. The serial input signal for a given scan line in each color is converted into a parallel output signal by a corresponding serial-to-parallel converter 150, which in turn converts the parallel excitation of the light emitting element as shown in FIG. Alternately supplied to the light emitting device array 120. Alternatively, as shown in FIG. 34, the dot sequential input signal for one scan line is converted into a parallel output signal by the serial-to-parallel converter 150, which in turn is used to excite the light emitting elements in parallel. It is supplied to the light emitting element array 120. When the color filter f is separated into columns of the group of horizontal stripe filter elements R, G, and B extending in a direction perpendicular to the scanning direction of the recording beam as shown in FIG. 32B, the line sequential input signal emits light. It is used to drive the light emitting element of the element array 120. In this case, a shift register can be used for serial-to-parallel conversion of the input signal.

Each individual pixel is modulated such that the intensity of light emitted from one light emitting element, the light emission duration of the light emitting element, or the emission period of the light emitting element is modulated in accordance with the information given to that pixel. It is preferable that the pitch of the stripe filter element of the color filter f is much smaller than the spot size of the light beam of each wavelength converged on the color filter f. This smaller stripe pitch is particularly effective to minimize the occurrence of registration errors or color shading when the optical system on the recording surface contains misalignment or distortion.

If the color filter comprises an island-like filter element α, β, γ or an island-like color filter f ₄ or F ₅ with a row of R, G, B groups, as shown in FIG. Is continuously input for the recorded pieces of video information. The light emitting element array 120 includes a plurality of groups of at least three light emitting elements (LEDs or laser diodes) 119a to 119c capable of emitting light in different wavelength regions. The groups of the three light emitting elements 119a to 119c are arranged in a straight horizontal row as shown in FIG. 36A or in a vertical column as shown in FIG. 36B.

The display unit shown in FIG. 28 is similar to the display unit shown in FIG. 26, but the condenser lens L2 in the optical path of the read light between the color filter f ₃ and the beam splitter l28 and the projection lens L _{3 is} shown. ) and it is different in that it is arranged in accordance with this arrangement, and increase the degree of freedom of design of the color filters (f _3), thereby the color filter (f ₃₎ can be easily produced at a low cost. This is the main advantage of the display unit arrangement shown in FIG. 27, and the color filters f ₁ and F ₂ integrated with the light-light conversion element 101 are compact and require a precise finish.

The reflected light modulated by the light-light conversion element 101 in accordance with the image information passes through the beam splitter l28, then is projected onto the color filter f ₃ by the projection lens L ₂ , and finally projected. Projected onto the screen 19 by the lens L ₃ . In this embodiment, the optical sensors 126a to 126d can be arranged in the corners of the color filter f ₃ in the same manner as shown in FIG. As a result, the operation of the position adjusters 125a and 125b may be controlled by the minute position adjustment of the light emitting element array 120. As such, the read operation can be performed accurately without a matching error. As another alternative, the position adjusters 125a and 125b can be combined with the color filter f ₃ to adjust the position of the color filter, as in the case of the embodiment shown in FIG. In this case, the optical sensors 126a to 126d are engaged with one surface of the color filter f _{3 in a} manner as shown in FIG. 30 to finely adjust the position of the color filter f ₃ . 25b) passes each output signal.

In addition, a color filter (f ₃₎ that can set the color filter (f ₃₎ on a screen (129) when observed by the inspectors. Hereinafter, the position adjusting operation of the display unit shown in FIG. 26 will be described. In order to adjust the position of the light emitting element array 120 in the X-direction (the longitudinal direction of the array), the optical sensor 126e has one edge of the recording surface of the light-light conversion element 101 in the manner shown in FIG. Is placed adjacent to. The optical sensor 126e consists of three sensor elements (a, B, C) arranged at positions corresponding to the positions of the three terminal stripe filter elements (α, β, γ) of the color filter f _l on the readout. do.

After the positioning operation starts in the X-direction, a matching pattern (calibration pattern) is generated by emitting a light beam from the light emitting element as long as it corresponds to the G (green) filter position on the read side (step 200 in FIG. 40). When exposed to a light beam, sensor elements a, B, and C generate sensor outputs a, b, and c, and deliver them to the X-direction arithmetic circuit 131 as shown in FIG. Arithmetic circuit 131 calculates the calibration data signal and sends the signal to positioner 125b. In calculating the calibration data signal, the sensor output b is compared with the sum of the sensor outputs a and c (step 202 in FIG. 40). If b ≦ a + c, the positioner 125b is driven to move the light emitting element array 120 in the X1 direction shown in FIG. 26 (step 204 in FIG. 40). Another comparison is made between sensor output a and sensor output c (step 206 in FIG. 40). In this case, if a <c, the positioner 125b is driven to move the light emitting element array 120 in the X2 direction (step 208 in FIG. 40). In contrast, if a> c, the positioner 125b is driven to move the light emitting element array 120 in the X1 direction (step 210 in FIG. 40). Adjustment continues until the conditions b> a + c and a = c are reached, and when this condition is reached, the position adjustment operation is stopped (step 212 in FIG. 40). In this way, the light emitting element array 120 is matched with the color filter f _l .

Position adjustment in the Y-direction (the transverse direction of the array 120) is performed as shown in the flow chart of FIG. The optical sensors 126d and 16f are disposed in one corner of the recording surface 127 of the light-light conversion element as shown in FIG. Outputs d and e from the respective optical sensors 126d (sensor D) and 126f (sensor E) are input from the Y-direction arithmetic circuit 132, as shown in FIG. The arithmetic circuit 132 compares the sensor outputs d and e to calculate a calibration data signal, which is supplied to the position adjuster 125. In this case, if d <e, the position adjuster 125a is driven to move the light emitting element array 120 in the Y1 direction. If d> e, the positioner 125a is driven to move the light emitting element array 120 in the Y2 direction. This adjustment continues until the condition d = e.

When an image is formed on the image forming surface of the photoconductive layer of the light-light conversion element 101, optical aberration such as distortion may occur as shown in FIG. By this aberration, the image on the color filter is performed out of alignment with the color separation pattern of the color filter f ₃ . As a result, color shading appears in the display image. Therefore, in order to overcome the problem of color shading, the color separation pattern of the color filter f ₃ is preferably corrected in advance in consideration of aberration.

As shown in Fig. 32A, when the color filter f ₃ has vertical stripes (vertically aligned filter elements), the above-described aberration is overcome by controlling the emission method of the light emitting element that copes with this aberration. Can be removed. On the other hand, if the color filter f ₃ is horizontally striped as shown in Fig. 32B, the oscillation mirror 122 is adjusted to vary the deflection speed of the light beam to remove the aberration. Further, in manufacturing the color filter f ₃ , it is possible to accommodate the aberration of FIG. 37.

In the illustrated embodiment, the information (image) recorded in the light-to-light conversion element is read out and projected onto the screen. According to the present invention, a light-to-light conversion element can be used as a display panel which the inspector directly observes.

Embodiments shown in FIGS. 26 to 43 have various advantages described below. Since there is no color separation and no synthetic prisms, the projection optical system is simple in structure and compact in size. In addition, the video recording system is composed of only one deflector, and its configuration is simple. A time sequential signal can be used to write information to the light-to-light conversion element. Each pixel is controlled to be written in compliance with the color separation pattern of the color filter so that matching error or color shading is minimized. The deflected beam of recording light may not exactly match the corresponding striped filter element of the color filter. The color filter on the recording side and the color filter on the reading side need not have the same wavelength. They require their respective color separation patterns corresponding to each other. The color separation pattern of the recording side color filter can be determined in consideration of the sensitivity and emission characteristics of the light emitting element in addition to the color requirements R, G and B. In addition, since the linearly aligned light emitting elements of the light emitting element array are excited in a linear sequential order, a relatively long recording time period is available, and an intense light source is no longer needed. The light emitting elements of the light emitting element array can be parallel excited or driven. By using a pre-adjusted or distorted color filter in its color separation pattern to remove distortion occurring in the recording surface, color shading can be minimized or substantially eliminated.

Many small variations and modifications of the invention are possible in light of the above description. Therefore, within the scope of the appended claims, the invention may be practiced otherwise than as specifically described.

1 is a schematic perspective view of a display unit according to a first embodiment of the present invention.

2 is a view similar to that of FIG. 1 showing a display unit according to the second embodiment;

3 is a view similar to FIG. 1 showing a display unit according to the third embodiment;

FIG. 4 is a view similar to that of FIG. 1 showing a display unit showing the fourth embodiment; FIG.

5 is a schematic diagram showing the structure of a zoom lens.

6 is a schematic perspective view of a display unit according to a fifth embodiment of the present invention including a zoom lens.

FIG. 7 is a view similar to FIG. 4 showing a display unit according to the sixth embodiment.

FIG. 8 is a view similar to that of FIG. 1 showing a display unit according to a seventh embodiment having a plurality of parallel arrangement of light emitting elements;

9, 10 (a) to 10 (c) and 11 (a) to 11 (f) are schematic diagrams illustrating the operation and configuration of the display unit shown in FIG.

12 is a schematic perspective view of a display unit according to an eighth embodiment of the present invention.

13 is a longitudinal sectional view of a part of a light emitting element array;

14 is a block diagram of a serial-to-parallel converter.

FIG. 15 is a view similar to FIG. 13 showing another light emitting element array; FIG.

16 is a side view of a light-to-light conversion element.

17 through 19 are schematic perspective views of three different display units according to ninth, tenth and eleventh embodiments of the invention.

20 is a schematic perspective view showing a main part of a display unit according to a twelfth embodiment.

21A to 21C are explanatory views illustrating the thirteenth embodiment of the present invention.

22 and 23a to 23c are explanatory views illustrating a fourteenth embodiment of the present invention.

24 is a schematic perspective view showing a display unit according to a fifteenth embodiment of the present invention.

25 is a perspective view similar to FIG. 24 showing a display unit according to the sixteenth embodiment;

26 to 29 are schematic perspective views showing four different display units according to the seventeenth to twenty embodiments of the present invention.

30 is a plan view of a light-to-light conversion element and its associated positioner assembly separation.

31A to 31C are enlarged perspective views cut away for clarity of a light-to-light conversion element having mutually stacked color separation filters.

32 is a plan view showing the arrangement of the color separation filter.

33 is a schematic diagram showing how each pixel of a light emitting element is driven.

FIG. 34 is a schematic similar to FIG. 33 showing another manner for driving a pixel.

35 is an exploded perspective view of another collar separation filter part;

36A and 36B are schematic diagrams illustrating two different arrangements of light emitting elements.

37 is a diagram illustrating distortion aberration occurring in an image formed on the photoconductive layer of the light-to-light conversion element.

38 and 41 are schematic diagrams illustrating the configuration of an optical sensor.

39 and 42 are block diagrams showing a general configuration of a positioner assembly controller using an optical sensor.

40 and 43 are flowcharts for explaining position control operations.

* Explanation of symbols for main parts of the drawings

6: light emitting element 7: microlens array

8: serial-to-parallel converter

Claims (13)

(a) first means (10) for generating an optical image by a light emitting element array comprising a plurality of light emitting elements arranged in a horizontal direction, each light emitting element having light intensity in accordance with information of a corresponding pixel; First means (10) for simultaneously emitting beams for a given time period, and (b) second means (10; 42; 82) for generating optical images by information recording media (12; 30; 40; 50; 74). And (c) at least one light-to-light conversion element 18 (32R, 32G, 32B; 70; 86) for storing the optically recorded optical image and optically reproducing the stored image, and (d A means (14,16; 46, 48; 52; 76; 80) for recording at least one of the optical images into the light-to-light conversion element (18; 32R, 32G, 32B; 70; 86). Display unit. A light emitting element array (10) according to claim 1, wherein said first means comprises a light emitting element array (10) consisting of a plurality of linearly arranged light emitting elements capable of driving to emit light beams according to a piece of information contained in a time sequential signal; The information recording medium 12 is disposed on the light emitting element array 10, and can move across the light emitting element array 10, and the light emitting element array 10 is arranged on the information recording medium 12. Display unit which acts as said second means when said optical image is recorded. 3. The collecting mirror according to claim 2, wherein said recording means is arranged in an output optical path of said light emitting element array (10) for scanning said optical image onto said light-to-light conversion element (18). A display unit comprising 14. 4. A display unit according to claim 3, wherein the deflection mirror (16) is rotatable in synchronization with the movement of the information recording medium (12). 3. The number of the light-to-light conversion elements 32R, 32G, and 32B is three, and the information recording medium 30 has three columns of three primary color images, and each column of one image of three primary colors. Is recorded in a corresponding one of the three light-to-light conversion elements, and a display in which a color separation prism 34 is disposed in the output optical path of each of the light-to-light conversion sources 32R, 32G, and 32B. Unit. The light emitting element array (10) according to claim 1, wherein said first means comprises a light emitting element array (10) consisting of a plurality of linearly arranged light emitting elements capable of driving to emit light beams according to pieces of information contained in said time sequential signal, And said second means comprises a light source (42) illuminating said information recording medium (40) to read an optical image. 7. A deflection arrangement according to claim 6, wherein said recording means is arranged in the output optical path of said light emitting element array (10) for projecting said optical image generated from said light emitting element array (10) onto said light-to-light conversion element. A display unit having a mirror (16) and a condenser lens (14). 7. The display unit according to claim 6, wherein said recording means comprises a transflective mirror (48) and an image forming lens (46) for sending said image read out from said information recording medium (40) onto said light-to-light conversion element. 7. The display according to claim 6, wherein said information recording medium (40) stores image information in the form of an electric charge image, said second means comprising a display head (44) for converting said electric charge image into an optical image. Unit. 9. A display unit according to claim 8, wherein said recording means comprises a color separation prism (52) disposed between said image forming lens (46) and said transflective mirror (48). 2. A display unit according to claim 1, wherein said second means comprises a mask (60) covering part of said information recording medium (40) to crop out a part of an optical image generated from said information recording medium (40). 9. The light-to-light conversion element 70 according to claim 8, comprises a color separation filter 72 having many continuous groups of fine striped filter elements, each group of filter elements comprising three filter elements of three primary colors. And the information recording medium (74) has a three primary color image. 2. A plurality of linearly arranged light emitting elements in accordance with claim 1, wherein said light-to-light conversion element 86 is transmissive and said first means is capable of driving to emit light beams in accordance with pieces of information contained in said time sequential signal. And a light emitting device array 10 including the light emitting device array 10. The information recording medium 12 is disposed on the light emitting device array 10, and may move across the light emitting device array 10. 10 serves as the second means when the optical image by the information recording medium 12 is recorded, and the recording means is adapted to project the optical image onto the light-to-light conversion element 18. A display unit comprising a beam splitter (80) disposed in an output optical path of the light emitting element array (10).