JPH10171017A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to improve the roughness in the density of video images on a display screen, by providing a display device with a spatial light modulation element, etc., for writing the images, then converting and reading out the images and illuminates the spatial light modulation element by different routes in a writing state and a reading-out state. SOLUTION: A SW is closed and the video of a negative film 3 is projected by stroboscope light 5 via a projection lens, etc., and is written to the SLM (spatial light modulator) 10. Since the SLM is in the incident state of external light, the light emission ends at about 500×sec in time. Next, the SW is opened to rapidly cut the electric field and the image recorded at the SLM 10 after the same makes the display image visually observed by a user in a transparent illumination system by lighting of an illumination device 13 of a back light separate from the light at the time of the writing. A photostand 2, thereafter, attains a standby state to accept a next command. The user is able to keep viewing the image of the SLM 10 set in this operation by the memory characteristic of the SLM 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film viewer, and more particularly to a display device suitable for a desktop film stand, an electronic album, etc., which allows a user to view a negative film as a positive image and view it. The present invention also relates to a display device for displaying a digital image with high quality, and more particularly to a display device suitable for displaying a still image.

[Summary of the Invention] When a display cartridge of APS is loaded in a film viewer using a spatial light modulator SLM using a ferroelectric liquid crystal element FLC, a photograph frame is inverted one after another and the service size is reversed. This is a display device that is displayed with the same size and the same vividness as a print, and is used when decorating on a table or viewing photos taken by everyone.

A smart display device for optically enlarging and projecting an image (area) as a photo stand. When an image is input from a personal computer or from a personal computer or other digital equipment, an electric signal (digital) is transmitted. The spatial light modulator for writing and reading an image signal has a large magnification even if it is thin, and has a structure for writing under external light and a structure for colorization. Provided is a display device using a modulation element as a display screen.

[0004]

2. Description of the Related Art Conventionally, display devices such as a film viewer generally use a CCD camera to convert a negative image into an electric signal and then display the image on a CRT or a liquid crystal display. In the case of a positive film, there has been a display device which optically projects and projects the image on a special screen. In addition, there have been various electronic image displays, mainly CRTs and liquid crystal displays, such as moving images (displaying still images one after another at a television rate).

On the other hand, a Spatial Light Modulator (SLM) which can be used for a display device
Devices capable of inputting, storing, reading, and erasing two-dimensional signals include an optical addressing method that inputs an optical image signal and an electric addressing method that inputs a time-series electric signal. As the former optical addressing method, there is a liquid crystal spatial light modulator, which comprises a liquid crystal layer for modulating an optical signal and a layer for transmitting writing light energy to the liquid crystal. For example, when used as a liquid crystal projector, an optical image is projected on a small-sized CRT, a liquid crystal spatial light modulator having a light transmitting layer and a liquid crystal layer is sequentially provided on the entire surface of the CRT, and the image of the CRT is photoconductive. Irradiating the surface of the body, for example, CdS, the light-irradiated part has a reduced photoconductor impedance, and a higher voltage is applied than the light-irradiated part, and follows the intensity distribution of the input image. When a voltage is applied to the liquid crystal, the transmission amount of the liquid crystal changes due to the hybrid electric field effect of the liquid crystal.
The above image appears. As a light transmission layer of such a liquid crystal spatial light modulator, a photoconductive material such as CdS, ZnSe, or a-Si, a photorefractive crystal such as BSO, BGO, or TBO, a group III-V, or a group II-VI. There are compound semiconductors, etc., high detection sensitivity, high resolution and high-speed response are required, as the conversion function layer of the liquid crystal layer, twisted nematic liquid crystal, electro-optical crystals such as LiNbO3, BSO, organic non-optical crystals, etc. are used, High-speed response speed and high contrast are required, and high-performance spatial light modulators have been developed.

[0006]

However, the above C
A display device using a CD camera is not suitable for displaying a silver halide photograph because the density of pixels of a CCD or a display as an image pickup device is rough and, for example, the face of a person in the image cannot be determined. .

[0007] In addition, regarding a display device using a positive film, the latitude (exposure latitude) of the positive film itself is narrow when it comes to photography, and various considerations are given to the conditions at the time of photography. Is difficult to accept, it takes time and effort in the development process, and it takes extra time to print the last favorite frame, so it is accepted by general users in terms of cost and labor compared to positive film. There was nothing.

Another point to be considered when using a negative film is the problem of light quantity.
The transmitted light amount of the developed negative film itself is less than 10% in an average scene. To enlarge and project this image requires an excessively large amount of light and requires a considerably large-scale apparatus. Therefore, there is considerable difficulty in creating a small and easy viewer as the object of the present invention.

On the other hand, a display device as described above is
Since all of them are mainly composed of moving images, the number of pixels (resolution) is extremely insufficient to view still images, and there are quite a few electronic display devices that have a quality that can be changed to, for example, silver halide printing. Did not. Also, there is a display device for high-definition television which is similar to the above-mentioned still image electronic display device, and although the number of pixels itself is somewhat improved as compared with that for a normal television, the driving method is still a television rate, or Since it is driven at a rate of about 60 Hz, which is twice that, when a slightly brighter still image is displayed, flicker is perceived by human eyes, and it is hard to say that it is very easy to see.

[0010]

SUMMARY OF THE INVENTION According to the present invention, the above disadvantages of the prior art can be solved by optically projecting a negative image onto a display screen, while simultaneously reversing the negative image. By constructing such a spatial light modulator on a screen, a comfortable device can be manufactured using a negative film used by ordinary users.

In particular, a ferroelectric liquid crystal FLC is used as a liquid crystal as an SLM.
By using the flash memory used in cameras and the like, flash images can be written instantaneously using the FLC's memory, and the images can be viewed with the backlight. It has overcome the shortcomings.

Particularly, in the case of a film of an APS system of a new camera, since a developed negative film is returned to a user in a cartridge, a very comfortable display device can be provided by using this device.

Further, according to the present invention, a pixel display capability several tens of times that of a moving picture display device is provided, for example, a resolution that can exceed that of a current silver halide photograph, and a backlight display that does not make the human eyes feel flickering at all. Provide a device with a function suitable for a new still image and a display device suitable for driving or holding the device. The display device includes a self-memorizing SLM, an illumination device for illuminating the stored image, an image writing device for recording an image on the SLM with high definition, a device for reading the image signal from an original image, or a digital device. A display device provided with a device for externally inputting data.

More specifically, the display device according to the present invention is a spatial light modulator capable of writing an image, converting the image, and reading the image, and capable of switching between a write state and a read state for the spatial light modulator. A switch means and an illuminating means for illuminating the spatial light modulator with different paths in the writing state and the reading state. Further, in the display device,
The spatial light modulator has memory means. Further, in the display device,
The spatial light modulator uses a ferroelectric liquid crystal in contact with a photoconductor layer.

Further, the display device according to the present invention comprises:
A spatial light modulator having a memory function of writing an image, converting and reading the image, a switch means capable of switching between a write state and a read state to the spatial light modulator, a flash device for illuminating an original image, Optical means for projecting the image of the original image, illumination means for illuminating the spatial light modulation element, and resetting of the spatial light modulation element are performed using the illumination means. Further, a display device using a spatial light modulation element capable of writing an image, converting and reading the image, wherein the spatial light modulation element has color separation means for separating white light into each color on the writing side, At the time of writing, and at the time of reading,
It is characterized in that an image is colorized through the color separation means.

Further, the display device according to the present invention comprises:
A display device comprising: a spatial light modulator capable of writing and reading an image; a writing unit for sequentially writing the image for each pixel; and an optical system for forming an image of light from the writing unit. It is characterized in that it has a plurality of reflecting means for keeping the writing optical path length substantially constant when writing an image on the element. Further, in the display device, the image division means has an independent control means for each area or line so as to be independently in the optical writing mode. In the display device, the lighting means may convert a light beam direction of the reflected light from the rotating polygon mirror, a semiconductor laser that generates a laser beam corresponding to an image signal, a rotating polygon mirror that reflects the laser beam. And a prism.

Further, the display device according to the present invention comprises:
A spatial light modulator capable of writing and reading an image, a first light source for sequentially writing an image for each pixel, and a second light source for reading image data written to the spatial light modulator
A display device comprising: a first light source;
Wherein the light source has light shielding means for shielding the area where the writing function is performed on the spatial light modulation element from external light.

Further, a spatial light modulator capable of writing and reading an image and a first light for sequentially writing the image for each pixel are provided.
A light source, and a second light source for erasing image data written to the spatial light modulation element, wherein the second image is written before writing a new image to the spatial light modulation element. It is characterized by functioning a light source.

A display device according to the present invention has a spatial light modulator capable of writing and reading an image, a first light source for sequentially writing an image for each pixel, and erasing image data written in the spatial light modulator. A writing unit for writing a new image into the spatial light modulator and an erasing unit for functioning the second light source are separated by a predetermined amount.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION

First Embodiment [1] Configuration of Display Apparatus FIGS. 1 to 4 are views for explaining a film viewer according to a first embodiment suitable for the present invention, and FIG. 1 is used in the present embodiment. FIG. 2 is an image diagram of a product, showing a film viewer 2 of a display device and a developed film (hereinafter referred to as “D cart”) 1 of an APS system film.
, The photographing screens are successively inverted negatively and positively and displayed one after another as high-resolution images. The film viewer 2 is a device such as an electronic album for viewing a photograph taken by himself on a desk or the like.

FIG. 2 is a structural diagram showing the structure of the contents of the photo stand 2 of the display device, and FIG. 3 is a structural diagram in which the inner optical system is further devised so as to be suitable for the device of FIG.

In the structural diagrams of FIGS. 2 and 3, reference numeral 3 denotes a developed negative film on which an image taken by the photographer pulled out of the D-cart 1 is shown, and one frame is formed by a known film winding mechanism (not shown). Each is sent out to the position shown in FIG. Numeral 4 denotes a milky white diffusing plate configured to uniformly diffuse the light emitted from the strobe device 5 and illuminate the negative film 3. Reference numeral 5 denotes a strobe device used in a camera or the like.
It is composed of an e-tube, a metal halide lamp, a reflector, a light emitting circuit, etc., and emits light in response to a trigger signal from a system IC described later. Reference numeral 6 denotes an orange-based removing filter, which is an optical filter that has a blue color that is a complementary color of orange and that serves to remove the orange-based color from the negative film image.

Reference numeral 7 denotes a projection lens, which is composed of a Gaussian type optical system having little distortion (distortion).
A negative film image is projected on ten photoconductor layers (photoconductive layers, hereinafter referred to as “photoconductor layers”). Further, reference numerals 8 and 9 denote reflection mirrors, which reflect the projection image of the projection lens 7 and project the same on the photocon layer of the SLM 10.

Reference numeral 10 denotes a spatial light modulator SLM, which will be described in detail with reference to a principle diagram shown in FIG. In FIG. 4, 10
a is a color filter of pure colors R, G, B or complementary colors Y, C, M, K, which may be in close contact with the ITO 10c;
For example, a fine filter used in an image sensor CCD used in a video camera or the like can be observed without deteriorating a silver halide image, which is desirable for the present apparatus. Further, 10b and 10h are polarizing plates sandwiching a liquid crystal layer 10e described later, and in the configuration of FIG. 4, the polarizing direction of the polarizing plate 10b is opposite to the paper surface, and the polarizing plate 10h is horizontal to the paper surface. It has a so-called cross Nicol configuration. Reference numerals 10c and 10f denote ITOs of a transparent conductive film usually made of indium oxide or the like. An AC power supply 11 and a circuit for driving the AC power supply 11 have different polar potentials between the ITOs 10c and 10f of the respective transparent conductive films. Is configured to occur. Reference numeral 10d denotes a photocon layer (photoconductive layer) on which a photodiode layer made of an amorphous film or an OPC (organic semiconductor film: Organic PhotoConductor) is formed.
10c and the other side is F
It is in close contact with LC10e.

Further, 10e is the FLC of the liquid crystal layer,
As described above, one surface is in close contact with the photocon layer 10d, and the other surface is in close contact with the alignment film 10i that regulates the alignment of the liquid crystal molecules of FLC. The alignment direction of the alignment film 10i is set such that the region where light has reached the OPC is in a light-blocking state and the region where light has not reached the OPC is in a transmission state. FLC is "Fello Electric Liquid Cr
This is an abbreviation of "ystal" and has a characteristic of fast response speed. In the description of the present embodiment, an example using such a type of liquid crystal will be described.

Further, 10 g is glass, and together with glass 10 j on the color filter 10 a, the liquid crystal layer 10 is formed.
While sealing e, it also serves to protect the other layers. Reference numeral 10k denotes a negative film image drawn close to the SLM 10 for explaining a virtual image of the pixel of the negative film 3 projected by the projection lens 7 of the projection optical system described above.

Returning to FIGS. 2 and 3, reference numeral 13 denotes a straight tube type lighting device often used for flat displays and the like.
Also, as shown in FIG. 2, reference numeral 14 denotes a pedestal supporting the photo stand 2, and a rotation axis for rotating the photo stand 2 by 90 degrees when viewing the image of the support portion 14a and the vertical position photographing. It has a portion 14b.

[2] Operation of Display Device The operation of the above-described configuration will be described with reference to the flowchart of FIG. When the user first loads the D-cart 1 into the photo stand 2 using the photo stand 2 to view the image in the cartridge of the D-cart 1,
The photo stand 2 detects the loading of the D-cart 1 in step # 1 and performs a thrust operation of sending out the film in the cartridge of the D-cart 1 in step # 1 by a designated operation of a microcomputer incorporated in a known control circuit. Then, the first frame of the cartridge of the D-cart 1 is positioned at the aperture of the photo stand 2 and stopped.

In this state, the apparatus enters the standby mode # 3, and waits for a signal from each switch of the operation panel (not shown). Next, when a signal that advances the screen to a frame that is an empty signal such as a remote controller is input in # 4, the film is fed by a known film winding mechanism to the frame specified in # 5, and the specified frame is Photo stand 2
(A portion corresponding to the negative film 3 in FIG. 2), and stands by at # 6 as a command waiting state as to whether or not to display this frame.

In this state, when a display command from the user is received in # 7, first, in order to reset the image of the previously displayed frame, the ITO 10c,
After the SW 12 is turned on to apply the AC power supply 11 during 10f, the backlight lighting device 13 is turned on in # 9 and the AC power supply 11 supplies ITO 10c, 10 in # 10.
An electric field on the opposite side is applied between f.

By such an operation, the FLC 10e becomes # 1
1, partially shown in the FLC 10e shown in FIG.
All the cells are inverted to the horizontal state, and are reset. After performing the reset operation for a sufficient time for all the cells in the FLC 10e to enter the above state, # 12
To turn off the SW12, and turn off the backlight illumination device 13 in # 13. From here, the flow of a new image writing operation is performed.

The current state of the photo stand 2 is, for example, placed on a shelf such as an office desk or a home wall, and the brightness of the environment is set within a brightness of about several hundred lux. ing. These external lights are reduced by about half by passing through one polarizing plate 10h and the liquid crystal layer 10e, and are incident on the photocon layer 10d. In the current state, since the SW12 is open, the ITO 10c, ITO10
No electric field is applied between f and the FLC 10e does not react.

Here, the SW 12 is closed and the strobe light 5
The image of the negative film 3 is projected through a projection lens or a reflection mirror to write an image on the SLM 10 as described above. However, since the operation is performed in a state where external light is incident as described above, It must be performed promptly under the condition that the projection light has a specified S / N. Fortunately #
The light emission of the strobe 5 performed in step 16 is about 500
Since all light emission is completed in about μsec, the turning on of SW12 performed in # 15 is also performed at the same timing for about the same time, and the electric field is rapidly cut off by opening SW12 in # 17. The user can visually recognize the recorded image on the SLM 10 in a transmitted illumination manner by turning on the backlight illumination device 13 in # 18.

By the way, when the amount of light incident on the SLM 10 is calculated in a typical example, the brightness of a small strobe device to be mounted on the SLM 10 is ² billion cd / m ² or more, and a typical lens and other components are used. Photocon layer 1 of SLM10
A light amount of about 5000lux is incident on 0d.

Thereafter, the photo stand 2 enters a standby state for receiving the next command of # 3, but the FLC 10e
With the memory characteristics described above, the user can keep looking at the image of the SLM 10 set by the above operation.

In the flowchart shown in FIG.
In the SLM 10, an electric field is applied between the ITOs 10c and 10f, the image of the negative film 3 is projected with a strong light amount through the color filter 10a, and the impedance of the photocon layer 10d changes according to the light amount. The applied electric field of the FLC 10e changes according to the value of
Since the degree of the torsion angle of the FLC 10e changes in accordance with the applied electric field, that is, a state where spatial light modulation is performed, and even if the SW12 is turned off thereafter, the degree of the torsion does not change due to the memory characteristics of the FLC 10e, By turning on the light 13, the same video image as that of the negative film 3 can be continuously displayed.

[Second Embodiment] [1] Configuration of this Embodiment FIGS. 6 to 10 show various aspects of the second embodiment, and FIG. 6 shows a display device 21 main body suitable for this embodiment. A part of the configuration is illustrated in a transparent and three-dimensional manner. The display device is a flat type, and a spatial light modulator 3
A prism 41 is moved below the spatial light modulator 30 over the entire surface of the spatial light modulator 30 by the mechanical scanning means 37. According to the movement, the prism 41 scans the prism 41 with the light beam of the laser 32 modulated by the video signal by the rotation of the polygon mirror 34, The data is sequentially written to the spatial light modulator 30.

Referring to FIG. 6, in a display device 21, a scanner unit 31 is configured such that a film cartridge 22 having a photographed image already developed can be loaded in a cartridge chamber (not shown). The developed film 23 is sent out by a known film feeding mechanism, and a frame 23a designated by the user is sent out into an optical path of a CCD 26 described later.

Reference numeral 24 denotes an illumination light source, which is normally invisible in a three-wavelength tube (a fluorescent tube having a well-balanced R, G, B wavelength) 24a, a reflection shade 24b, and FIG. The film 23 is disposed at a position substantially in close contact with the film 23, and the film 23 is sequentially fed by the film feeding mechanism.

A projection lens 25 reduces and projects the image of the film frame 23a on the line CCD 26. The projection lens 25 has a built-in aperture device, which is a well-known autofocus and exposure adjustment mechanism.

Reference numeral 26 denotes a line CCD for R, G,
B and three lines, and a color filter of each color is formed in front of each line. The luminance information of each color is output from each line to an A / D converter 27 by a shift register, converted into digital information, and then enters a mixing circuit 28 and is input to a laser drive circuit 29. The output of the laser drive circuit 29 is connected to a semiconductor laser 32 described later and drives the semiconductor laser 32.

Reference numeral 52 denotes an external input terminal for receiving image data from a CD-ROM or the like inputted via a personal computer 53 from the outside, and converts known digital image data (for example, image data such as JPEG. And MPEG.) The external data processing circuit 54 drives the semiconductor laser 32, which will be described later, in accordance with the present apparatus, writes the data as appropriate image data in the SLM 30, which is also described later, and performs data conversion so that it can be viewed. The data is output to the mixing circuit 28.

Reference numeral 30 denotes an SLM using FLC, a detailed view of which is shown in FIG. 7, which is a liquid crystal plate without a segment pattern having a memory function, and is a film image read by the scanner unit 31 described above. Is written as a high-quality picture by the semiconductor laser 32 in the form of passing through some filters and arithmetic units, and is illuminated with a backlight according to a flowchart described later to provide a high-quality still image to the user. . Here, FIG. 7A is a state diagram at the time of irradiation from the semiconductor laser 32 at the time of writing to the SLM 30, and FIG. 7B is a state diagram at the time of irradiation of the backlight 43 after the end of writing. Is shown.

In FIG. 6, a polarizing plate 30h is provided on the entire surface of the SLM 30, and a glass 30g is also provided below the polarizing plate 30h. In addition, the ITO 30c is formed in a stripe shape on the entire surface of the SLM 30, and a transistor made of a thin film is provided for each pattern as a switch so that the electric field of each pattern can be controlled independently. I have.

The SLM 30 will be described in detail with reference to the principle diagram shown in FIG. 7. Reference numeral 30a denotes a pure or complementary color filter, for example, an image pickup device C used in a video camera or the like.
Fine-grained objects used in CDs can be observed without deteriorating silver halide film images, which is desirable for the present apparatus. Numerals 30b and 30h denote polarizing plates sandwiching a liquid crystal layer, which will be described later. In the configuration shown in FIG. 7, both 30b and 30h have a so-called parallel Nicol configuration in which the polarization direction is opposite to the paper surface. Reference numerals 30c and 30f denote ITO (transparent conductive film) which is usually made of indium oxide or the like. The AC power supply 50 and a circuit for driving the AC power supply 50 are configured so that different polar potentials are generated in the respective transparent conductive films by the SW 55. I have.

As shown in FIG. 6, the transparent electrodes of the ITO 30c form independent electrode patterns on stripes having a very fine pitch in the vertical direction (scan direction of a polygon mirror described later) in the figure. A publicly known transistor switch is configured so that power supply can be controlled independently of the above pattern.

Reference numeral 30d denotes a photocon layer (photoconductor layer) on which a photodiode layer of an amorphous film or an OPC (organic semiconductor film) is formed.
One surface is in close contact with the above-described ITO 30c, and the other surface is in close contact with the FLC 30e to be described later. Also,
Reference numeral 30e denotes a liquid crystal layer, which can be composed of various types of liquid crystal devices, and has one surface adhered to the photocon layer 30d and the other surface adhered to the alignment film 30i as described above. 30g is glass, which serves to seal the liquid crystal layer 30e together with the glass 30j on the color filter 30a and at the same time protect the other layers.

On the surfaces of the glass 30g and the polarizing plate 30h, strong external light from outside the light-shielding area of a light-shielding plate 38b described later shown in FIG. The surface is coated with an anti-reflection film so as not to degrade the S / N of the image writing operation due to.

Reference numeral 32 denotes a near-infrared semiconductor laser.
It has an erasing laser 32a for erasing an old image already written on the SLM 30, and a writing laser 32b for writing image data newly sent from the film scanner unit 31.

Incidentally, it is preferable that the erasing operation of the image previously written on the SLM 30 is performed immediately before the operation of writing the new image, as in the so-called "wipe switching", which is preferable in the structure of the product. , Can be shown to the user. Specifically, this erasing operation is performed by applying the electric field of the ITO line several to several tens of lines before the newly written image in the opposite direction to the time of writing the image, and irradiating infrared light of the erasing laser 32a in a DC manner. Uniform pre-writing state of liquid crystal (Fig. 7
In other words, the FLC 30e is in a horizontally long state in the figure)
To produce

Therefore, the erasing operation as in this embodiment,
In order to perform the writing operation simultaneously with different semiconductor lasers, if the voltage applied to the patterned ITOs 30c and 30f is 0V on the non-pattern side (common side), for example, -30V on the erasing side and + 30V on the writing side. It is necessary to apply both positive and negative potentials to the common potential.

At this time, an electric field is also generated between +30 V and -30 V (an electric field in a direction parallel to the FLC). However, as described above, the electric field is generated between immediately adjacent patterns so as not to adversely affect writing and erasing. By performing writing and erasing in a pattern separated by a predetermined amount without performing writing and erasing, the S / N of an image can be improved.

Since the erasing operation and the writing operation are actually performed in a portion covered by a light-shielding plate 38b, which will not be exposed to external light, the user passes the light-shielding plate. The image can be seen before and after.

Reference numeral 33 denotes a first convex lens unit for substantially forming an image of a semiconductor laser (hereinafter simply referred to as a laser) 32 on a polygon surface of a polygon mirror 34. The polygon mirror 34 has an axis 34a not shown. And is rotatably supported by the supporting mechanism described above, and has an octahedral mirrored outer shape.

A projection lens 35 projects the image from the polygon mirror 34 onto the SLM 30 described above. The total reflection prism 41 and the reflection mirror 42 shown in the side view of FIG.
The image of the semiconductor laser 32 is formed on the photocon layer 30d of the SLM 30 according to the optical path passing through.

Reference numeral 36 denotes a stepping motor which transmits the output from the output shaft to the helicoid screw shaft 37 and rotates, so that the female helicoid 38 meshing with the helicoid screw shaft 37 and a groove (not shown) of the main body 21 The integrated light shielding plate 38b is moved in the horizontal direction in the figure.

When the image is reset by the semiconductor laser 32 or when a new image is written, the light-shielding plate 38b is exposed to external light by the color filter portion 30a and the liquid crystal portion 30 of the SLM 30.
e plays a role in preventing the photoconductor layer 10d from being applied with an electric field. This is for improving the S / N of the written image.

A connecting gear 37a formed coaxially with the helicoid screw shaft 37 meshes with a gear portion 39a of a second helicoid shaft 39 to be described later so as to transmit the power of the stepping motor 36.
Reference numeral 39 denotes a second helicoid shaft, which is rotatably supported by a main body by a guide member (not shown). A second female helicoid 40 is screw-coupled to the helicoid portion, and a gear is provided when the aforementioned stepping motor 36 rotates. Part 37
a, 39a rotate through the second helicoid shaft 39
To move the second female helicoid 40 left and right in the figure.

In the present embodiment, the lead of each screw of the helicoid shaft 37 and the second helicoid shaft 39 is 2: 1, and the second female helicoid 40 has just half the stroke of the female helicoid 38. The optical path length from the lens 35 for forming an image on the SLM 30 of the semiconductor laser 32 to the SLM 30 is set to be substantially constant regardless of where the SLM 30 is written. Is configured.

The second female helicoid 40 has a prism support 40 for supporting a triangular prism 41 described later.
There is a. As shown in FIG. 8, the laser light output from the semiconductor laser 32 enters the prism 41 through the polygon mirror 34 and the imaging lens 35, is reflected twice, and has a direction of 180 deg. Then, the light is incident on the reflection mirror 42 and the direction is further changed to 90 deg. The image is changed to form an image on the photocon layer 30d of the SLM 30.

Reference numeral 51 denotes a detection pattern for outputting position information relating to the striped ITO 30c on the SLM 10. In this case, the pulse pattern of the detection pattern 51 is detected by a known photo sensor, and the semiconductor laser 32 is detected.
a and 32b are detected, and by these configurations, accurate semiconductor lasers 32a and 32b are detected.
, And the switching timing of each of the above-mentioned ITO patterns 30c is controlled to apply an inverted electric field on the erasing side and the writing side, respectively.

The reflection mirror 42 is supported by a support portion (not shown) of the above-mentioned female helicoid 38 and moves integrally with the female helicoid 38.

Therefore, even if the triangular prism 41, the reflecting mirror 42, and the light shielding plate 38b move to the positions 41 'and 42', respectively, by the rotating power of the stepping motor 36, the photo-controller of the SLM 30 can be moved from the imaging lens 35. The structure is such that the distance to the layer 30d does not change.

Reference numeral 43 denotes a known backlight comprising a light source comprising a three-wavelength fluorescent tube or the like and a known reflective light guide plate, etc., after writing an image on the SLM 30 as described in a flowchart described later. The light is turned on when the written image is viewed by turning off the electric field to provide the user with a good backlight illumination image.

[2] Operation of the Present Embodiment The operation of the device 21 having the above configuration will be described with reference to the flowcharts of FIGS. First, # 10
1 is a normal display state, in other words, a command from a known remote controller is received from a user in a state where the user is waiting for a command.

Next, in step # 102, the state of the apparatus is checked. In step # 103, the light-shielding plate 38b, the mirror 42 and the prism 41 or the female helicoid 3 for image writing are particularly used.
The positions (states) of positions 8 and 40 are checked. At this time, whether the writing operation or the display operation is performed, the position of this unit becomes a key. First, an abnormal operation is detected.

Here, when the position of the light shielding plate 38b is located in an abnormal place, the recovery operation of # 104 and below is performed. First, in step # 104, a stepping motor (ST
M) 36 is driven in the CW direction, the mirror 42 and the light blocking plate 38b in FIG. 6 are brought to the leftmost standby position in FIG. 6 in a set with # 105, and the process proceeds to # 108 in that state.

On the other hand, in # 103, the position of the light shielding plate 38b is
Whether it is at the leftmost end (first standby position) or the rightmost end position (second standby position) in FIG. 6 is determined in # 106.
The following controls are performed.

When in the first standby position, # 1
At 08, it is determined whether or not the screen 23a of the film 23 of the film scanner is the designated screen of the remote controller.
Otherwise, in step # 109, the film is fed to the user's designated screen by the known film feeding mechanism, and the process exits from step # 108, which is the determination flow. Then # 11
In step 4, a determination flag of P = 0 is set in the temporary memory RAM of the system, and in step # 115, the display backlight 43 is turned off.

If it is determined in step # 106 that the light-shielding plate 38b and the like are in the second standby position, then in step # 110, the screen 23 of the film 23 of the film scanner is also turned on.
It is determined whether or not a is the screen desired by the user. If not, the film feed to the designated screen is performed as described above in # 111, and the final position of the screen is determined in # 112. Feeding is continued until. That is, the light shielding plate 38 is used in the image writing operation to the previous SLM 30.
When b or the like is performed at the far right end in FIG. 6, the next writing is performed in the opposite direction (from the right end to the left end). It is devised to perform a series of operations quickly.

After the above-described operation has been performed in # 112, P =
1 judgment flag is set and # 115 backlight 4
3 is shifted to the step of turning off the light.

Naturally, before the step # 115, the image previously written to the SLM 30 is visible to the user, and only the minimum operation of the following operations for writing a new image to the SLM 30 is performed. The sequence is to turn off, creating a comfortable operation for the user.

As described above, at step # 115, the backlight 4
After turning off the light of No. 3 and the display disappears (although it looks dark due to external light), # 11
6, the polygon mirror 34 starts rotating, and the SLM
The flag that stores the direction of the write operation to
When reading is performed in step 117 and writing is performed in the forward direction, #
While feeding the film in the normal rotation direction at 118, in synchronization with this, in step # 119, the stepping motor (STM) 36
Is driven in the CCW direction to move the light shielding plate 38b and the like to the right in FIG.

In this movement, by reading the above-described detection pattern 51 with a foot sensor (not shown), the writing position is accurately detected by the semiconductor laser 32, and an electric field on the opposite side is applied only to the conductive pattern 30c to be erased in # 120. , # 121, the pixel portion of the conductive pattern portion after erasing in # 120 (accurately on the photocon layer), a positive electric field is applied to the conductive pattern portion, and at the same time, in response to a write signal ( A signal obtained by inverting the read signal of the pixel from the film scanner unit into a negative / positive signal) Semiconductor laser 3
The writing signal of 2b is emitted, and writing of a new image is performed.

Such an operation is continuously performed in step # 122. It is determined in step # 123 whether or not one frame of the film has been completed.
Returning to # 117, the operation up to now is repeated again. Further, when the termination is determined in # 123, # 12 is further performed.
Proceed to 8.

If P = 1 is determined in # 117, that is, if scanning in the reverse direction is necessary, the film feeding motor is driven in reverse at # 124, and the stepping motor 36 is synchronized with this. Driving in the CW direction, the position signal is accurately detected by the detection pattern 51, and then the semiconductor laser 32b is used as a preceding erasing laser (that is, a reverse electric field is applied to the pattern portion hit by the semiconductor laser 32b). ) 32a is used as a writing laser (steps # 126, # 127).
This operation is continued until all the images for one frame of the film are written in the same manner as described above, and when the end is determined in # 123, the process proceeds to # 128.

Thereafter, in steps # 128 to # 131, the stepping motor 36, the polygon mirror 34, and the known feeding motor for feeding the film 23 are stopped, and
At 131, the backlight 43 is turned on so that the user can see the image just written. At step # 132, the remote controller enters a standby state for reception, which is a step of starting the operation, and a series of operations ends.

In this embodiment, the CC for the film scanner is used.
A / D conversion of the R, G, B signals from D26 to SLM
30 and displayed to the user, but the three color signals sent from the personal computer are mixed by the mixing circuit 2
It is of course easy to insert and display the data on the display 8.

Further, it is sufficiently possible and easy to display the output of the CDROM and the video signal in the same manner.

In the above embodiment, two types of SLMs have been described with reference to FIGS. 4 and 7, but there is no difference in basic functions. Further, by using the FLC which can respond at high speed, the switching of the film frame can be speeded up.

[0081]

As described above, according to the present invention, according to the present invention, a device for viewing a very high-quality image with a simple structure can be provided, and a low-cost and small-sized product can be provided.

In particular, the present invention is characterized in that a strobe device used in a small camera or the like is used as a negative illumination device, and a potential is supplied for a short time to the photocon layer of the SLM in synchronization with this. This makes it possible to write an image on the SLM in a very short time, eliminating the need for a light-shielding cover that covers the SLM for removing external light, miniaturizing it, and reading out the transmitted light from the color SLM. Since the memory image after turning off the potential at the time of writing as described above was illuminated with a lighting device such as a fluorescent lamp separate from the writing light, a very high quality display with a very inexpensive device and structure Could be configured.

Further, according to the present invention, a silver halide film having a high image quality such as a silver halide print which has obtained citizenship as a still image, and which is thin enough to be used for hanging on a wall, and is used as an image source. Not only image data and video signals from a CD-ROM or the like coming in through a personal computer can be displayed, but a very easy-to-use display device can be provided.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a display cartridge of an APS system which is an image input medium suitable for the present invention and a typical appearance of the present apparatus.

FIG. 2 is a cross-sectional view of a display device according to the present invention.

FIG. 3 is a cross-sectional view of a display device according to the present invention.

FIG. 4 shows an SLM used in a display device according to the present invention.
FIG.

FIG. 5 is an operation flowchart of a display device according to the present invention.

FIG. 6 is a conceptual view of transmission of a display device according to the present invention.

FIG. 7 shows an SLM used in a display device according to the present invention.
FIG.

FIG. 8 is a sectional view of a display device according to the present invention.

FIG. 9 is a partially enlarged view of a transmission conceptual diagram of the display device according to the present invention.

FIG. 10 is an operation flowchart of the display device according to the present invention.

FIG. 11 is an operation flowchart of the display device according to the present invention.

[Explanation of symbols]

 1,22 film cartridge 2 photo stand 3,23 negative film 4 diffusion plate 5 strobe device 6 optical filter 7,25 projection lens 8 reflection mirror 9 reflection mirror 10,30 SLM 10e, 30e FLC 13 lighting device 14 pedestal 26 CCD line sensor 27 A / D converter 28 Mixing circuit 29 Laser driver 32 Semiconductor laser 34 Polygon mirror 41 Triangular prism 43 Backlight

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Akihiko Nagano 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc.

Claims (14)

[Claims] 1. A spatial light modulator capable of writing an image, converting and reading the image, switching means for switching between a write state and a read state with respect to the spatial light modulator, and a write state and a read state. And illumination means for illuminating the spatial light modulation element with different paths. 2. The display device according to claim 1, wherein said spatial light modulator has a memory means. 3. The display device according to claim 1, wherein the spatial light modulator uses a ferroelectric liquid crystal in contact with a photoconductor layer. 4. A spatial light modulator having a memory function of writing an image, converting and reading the image, switch means capable of switching between a write state and a read state with respect to the spatial light modulator, and illuminating the original image A flash device, an optical unit for projecting the image of the original image, an illuminating unit for illuminating the spatial light modulator, and a resetting of the spatial light modulator using the illuminating unit. . 5. A display device using a spatial light modulator capable of writing an image, converting the image, and reading the image, wherein the spatial light modulator includes a color separating unit for separating white light into respective colors on the writing side. At the time of writing,
And a display device for performing colorization of an image through the color separation means at the time of reading. 6. A display device comprising: a spatial light modulator capable of writing and reading an image; writing means for sequentially writing an image for each pixel; and an optical system for imaging light from the writing means. A display device comprising a plurality of reflection means for keeping a writing optical path length substantially constant when writing an image on the spatial light modulator. 7. The display device according to claim 6, wherein each of said image dividing means has an independent control means for each area or line so as to be in an optical writing mode independently. 8. The display device according to claim 6, wherein said lighting means includes a semiconductor laser for generating a laser beam corresponding to an image signal, a rotating polygon mirror for reflecting said laser beam, and said rotating polygon mirror. A prism for changing the direction of the reflected light of the light. 9. A spatial light modulator capable of writing and reading an image, a first light source for sequentially writing an image for each pixel, and a second light source for reading image data written to the spatial light modulator. The display device according to claim 1, wherein the first light source includes a light blocking unit that blocks an area where the writing function is performed on the spatial light modulation element from external light. 10. The display device according to claim 9, wherein said spatial light modulator can be divided into a plurality of areas to be writable, and is independently controlled for each area or line so as to be in the writing mode independently. A display device characterized by comprising means. 11. A spatial light modulator for writing and reading an image, a first light source for sequentially writing an image for each pixel, and a second light source for erasing image data written to the spatial light modulator. In the display device comprising a light source, prior to writing a new image to the spatial light modulator,
A display device characterized by causing the second light source to function. 12. The display device according to claim 11, wherein the spatial light modulator is capable of dividing an image into a plurality of areas and erasing an image, and independently controlling each area or line to be in an image erasing mode. A display device comprising control means. 13. A spatial light modulator capable of writing and reading an image, a first light source for sequentially writing an image for each pixel, and a second light source for erasing image data written in the spatial light modulator. A display device comprising a light source, wherein a writing unit for writing a new image into the spatial light modulator and an erasing unit for functioning the second light source are separated by a predetermined distance. 14. The display device according to claim 13, wherein said spatial light modulation element is capable of dividing an image into a plurality of areas and erasing an image, and independently controlling each area or line to be in an image erasing mode. A display device comprising control means.