JPH05500739A - Frame order color display system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] name of invention Frame order color display system FIELD OF THE INVENTION The present invention relates to a frame-sequential color display system.

There are various methods commonly used in the market for producing color display devices.

The most common of these is the cathode ray tube (CR) used in television receivers. T). The above colors here are the colors that emit red, green, and blue fluorescence. It occurs when an electron beam is irradiated to individual, isolated locations. Therefore, each painting A pixel is composed of three smaller elements. By looking at it from a distance, The eye cannot resolve the individual spots mentioned above, and the primary colors are used to give the illusion of a wide range of colors. are combined together. Cathode ray tubes, of course, have limitations in size and resolution. There is.

A similar technique can be used, for example, to create a series of fine line color filters on the front panel. Along with the liquid crystal (hereinafter sometimes referred to as C) cell that covers the (hereinafter referred to as backlight) mode (thin film transistor (TF) T's) and C, display devices. the above The filter consists of a 640x6000 array of individual pixels with a 640x200 color - L at the required pixel points along each sushi so that it is an array of pixels. , C, red color with rows of TPT's arranged in such a way that the cell material operates , green and blue sushi are arranged. This is very uneconomical.

It is difficult to arrange such fine line filters with intervals of several microns. Instead, for the CR'I' color system, 273 of the resolution is attenuated.

Frame order color is usually a sequence of green, blue frames followed by red frames. The above resolution is achieved by illuminating all images with color order in a typical frame. Prevent casualties. The eyes look at red, green, and blue information in sequence, and if fast enough If so, add the colors together. Explanation demonstrated by Ba1rd in 1928 was the first color display device. The optical transmission area of the image for each color frame is By reproducing it, you can see a fully colored image.

Like a rotating color filter wheel to generate the desired sequence of colored light. Frame sequential color display systems using mechanically movable color filters are known for this purpose. However, such arrangement of working parts is not commercially acceptable, especially for large scale display devices. There are mechanical difficulties that make it impossible. System for flashing differently colored light sources are also known, but those systems have limited lamp life and/or A problem exists due to the relatively slow rate of color change.

As a system known in the pond, it is possible to pass through stripes of differently colored film in sequence. Polarized light with corresponding stripes to transmit the camera image to the photographer's eyes Along with the softer, the lens is placed between crossed polarizers placed close to the photographer's eyepiece. There are television camera viewfinders that use bright color filters. Ru.

The above filter must be close to the photographer's eye, and in any case Since polarizers have the disadvantage of unnecessarily dissipating high parts of the incident light , this arrangement is also inconvenient, especially for large-scale display devices.

The present invention has been made to solve the above-mentioned problems. To provide a display system that can be beneficially used in devices.

One aspect of the present invention is (1) an image forming means for limiting an image, (2) a light source, and (3) the above-mentioned fixed filtering means between the light source and the image forming means; The taring means emit an order of differently colored light at a rate of at least 30 orders per second. (Sequence) is repeatedly transmitted to the image forming means. and a second state arranged to repeatedly electrically switch between the state and the second state. comprising one switchable substance, each of the image forming means being differently colored; A frame-sequential color display system capable of reproducing the above images for each transmission of light. I will provide a.

For example, as soon as you switch between a colored state and a mostly transparent state, Appropriately colored guest/host (gu est/host) L, C, the means for color filtering the separated layers of matter is However, the selection of the above-mentioned materials is a problem, and the multi-layer structure as mentioned above is This results in unnecessarily high light losses.

Therefore, a system in which color filtering means are used can be used to A part of the light transmitted to the image forming means is separated horizontally into different colors. a color filter arranged to provide at least two differently colored materials; It is preferable that the switchable substance has a colored area. The filter area selectively transmits colored light to the image forming means. It is preferable to be able to switch between the two.

In theory, there is no limit to the number and arrangement of the differently colored filter regions described above. However, in reality, the filter area is to some extent in the path of light to the image forming means. Using two or more regions of each color interspersed with each other in Conveniently, preferably in the form of a colored filter arrangement, e.g. It is arranged in such a way that the incident light is separated horizontally into red, green, and blue beams. The stripes of each color are arranged almost parallel to each other.

Arranging the color filtering means according to the invention between the light source and the image forming means When the system operates, each colored light is diffused into the image. Therefore, a light diffusing means can be placed between the filtering means and the image forming means. It has the advantage of being more preferably located. The above diffusion may be striped or other undesirable patterning of the image that can be seen by a filter with the shape of can be reduced or prevented. e.g. diffuser or non-focal Fresnel lens can be used as a light diffusing means.

For golden display devices, a system of sequential red, green, and blue light is applied to the image forming means. It is preferable to transmit the above colors into the filtered light. is the preferred filter area. The characteristic wavelength and intensity of the above colors are known. Then, a suitable multi-layer dichroic filter or a suitable colored filter covering the reflector is used. Ruta substances are also known.

said switchable substance transmits a respective colored light to said image forming means; When used as a “Nyatta” that selects 4 or 4 beams of light onto the selected filter area between the source and the color filter material. or from a selected filter area between the filter material and the image forming means. transmits only the light that is transmitted.

Additionally, the switchable substance can be used between two filters or on both sides of a filter. It can be provided on the same plane. The switchable material may also be used as an intermediate layer, e.g. or mixed within the colored filter material in the form of dispersed particles or droplets. You can also do that.

In many cases, the switchable material is highly transparent in color transmission form. , or relatively transparent, preferably substantially transparent, in the second state. be relatively light scattering or opaque, preferably well light scattering. or substantially opaque.

The above-mentioned switchable substance can be selected from known substances, but according to the present invention, the switchable substance can be selected from known substances. The use of liquid crystal materials as replaceable materials is very advantageous and the present invention According to another aspect, it is possible to provide a frame color development display system having the following configuration.4- Ru. The above configuration includes (1) a tanu image forming means that limits the image, (2) a light source, and (3 ) to laterally separate a portion of the light transmitted from the light source to the image forming means. at least two of the color filter materials arranged to give each a different color; (4) fixed color filtering means with two differently colored regions; Each of the above images can be reproduced due to the respective transmission of differently colored light. The respective colored films are applied to the image forming means at an ordinal rate of at least 3° per I second. The color transmission state and the second liquid crystal material arranged to be electrically switchable between states.

Black guest/host type liquid crystal materials are particularly useful as “Nyatta” materials. be sufficiently opaque or scatter light in - conditions, and in other conditions. Other materials that are fully translucent or transparent when electrically switched to the type can also be used. The black guest/host type above has a backlight. The scatter type is preferred for projection displays, while the scattering type is preferred for projection displays. Main departure Suitable liquid crystal materials for various versions of the light are selected according to requirements. Scattered For turbulent systems, the typical refractive index of the liquid crystal is dependent on the preferred refractive index of the parent polymer. substantially match. Regarding polyvinyl alcohol base material, Br1tish D rug House (BDH) E7 or E63, or Merck A liquid crystal such as the ZLI 1840 can be used. Multicolor dyes are combined with the above liquid crystal. Can also be mixed.

An exemplary suitable dye is D109. D85. It is D106.

Also, such as BDH's DI09E63 or Merck's ZLI3499. There are also commercially available liquid crystal materials in which dyes are mixed with liquid crystal in advance.

When liquid crystal (L, C,) materials act as “shutters” as described above, appropriate The above-mentioned, C, material dispersed in a polymer having a base material, preferably an organic polymer. Preferably, fine droplets or grains are used. Such encapsulation The droplets or grains of LC4 material that are small enough to allow ultrafast switching to non-aligned, highly light-scattering states. It can be easily done. 1 second to achieve 30 sequences of 3 colors in 1 second While controlling the transmission of each color "on and off" 30 times per session, the switch operation Switching the “shutter” material to allow as much time as possible It is clear that this is necessary.

According to the present invention, the actual switching response time is less than 10m5ec, preferably 7 It is possible to require a time of less than m5ec, more preferably 3 to 5 m5ec, This can be achieved by using encapsulated or C substances as described in Jll. It can be confirmed that it is achievable.

Encapsulated liquid crystal materials suitable for this purpose are disclosed in U.S. Pat. 7.4671618.4673255.4685771.4688900.45 79423.4605284.46] 6903, and 470708D. and claims, and the contents described therein are incorporated herein by reference. Has been incorporated.

Also, for reference, PCT application publication number W085104262 and Japanese application publication number No. 61047427A, both of which are incorporated herein by reference. Ru.

The direction of the electric field applied when using a high frame rate display device The average thickness of A small droplet or The majority of the grains, preferably at least 75%, more preferably at least 90%, most preferably With virtually all the continuous Materials consisting of droplets or grains of liquid crystal material in a polymeric matrix are advantageous. of the board Because it is difficult to make the spacing accurate, especially over a wide area, The thin thicknesses mentioned above result in cells where the liquid crystal material is simply confined between two plates. This is difficult to achieve in other countries.

Switchable L,C materials to transmit the required sequence of colored light Appropriate electronic circuits and electrodes to control the switching of capable substances are readily available to those skilled in the art. You can invent something. For example, the electronics used to control the switching of the gloss The circuit must be red, green, or blue, for example, or in the required image order. input section from the drive circuit for the image forming means for limiting the starting point of the frame at the It consists of In those input sections, an image representing the color red is generated by an image forming means, etc. Add red, green, and blue filters so that only red vines open when limited. The drive circuit allows a continuous voltage to be applied to the overlying gloss material.

The image forming means replays the image at least once for each transmission of colored light. It is of a type that can be expressed. Cathode ray tubes, which produce black and white images, have limited use, but A more adaptable display device would be a composite array of pixels or a variety of known composite display devices. Formats can be made available for use. The image forming means is forming an image by a light transmitting region and a light scattering (or substantially opaque) region It is preferable.

In public light display devices, a limited portion of the image for each color frame is displayed. The light transmission area of the image allows each colored light to pass through the viewer's eye, while scattering Disturbed or opaque areas block light.

The resulting differentially colored partial images preferably avoid flickering of the human eye. For quick transmission that repeats the color frame sequence at a faster rate than the The colors are composited by the viewer's eye to provide a complete picture. Front lighting ( (front-1it) (hereinafter referred to as front light) display device, each This partial image scattering area reflects colored light to the viewer's eyes, while The light transmission region passes most of the incident light away from the viewer.

A preferred form of the composite image forming means conveniently addresses the individual pixels. typically indium/tin oxidation controlled by field effect transistors to encapsulated droplets, preferably as described above, together with transparent pixel electrodes that are transparent pixel electrodes. Alternatively, it may be in the form of particles or a substance may be used. Such a system is For example, 1 to 4 square mi! I / -) using small individual pixels of High video resolutions are achievable and can be accommodated in relatively large display areas as well. Co-pending British Patent Application No. 8617866, which is incorporated herein by reference. Acceptable production can be achieved by using the techniques described in Wear. It is also possible to see a larger image by eye and by looking away from the display device. Alternatively, smaller pixels can also be used. The above encapsulated, C, The material has a particle or droplet size as described above for L, C, "shutter" materials. Preferably, it is the same size as the size and has the same advantages. Black guest/host material is preferred for optimal "on/off" contrast.

A novel color filtering means including switchable, C, “glossy” itself It will be understood that this is one aspect of the present invention. This means that (1) the color filter material (2) at least two differently colored regions passing through the element in use; The light transmission state and the second state so that the minute selects the colored area gives color to the light. Corresponding to the colored area above, arranged so as to be electrically switchable between A selective color filter element comprising selected areas of liquid crystal material. L, C .

Preferred types and arrangements of materials apply as described above.

Color televisions and other color movie display devices advantageously utilize the frame order of the present invention. It can be seen that it can be based on a color display system.

The present invention can be explained in detail with reference to the drawings shown below.

FIG. 1 shows the structure of the backlight display system of the present invention.

FIG. 2 is a partially enlarged view of the color filtering means shown in FIG.

FIG. 3 shows the structure of a projection display system according to the invention.

Referring to the drawings, Figure 1 shows that an incandescent filament light source or other light source may be used instead. Although possible, the light source 10 is depicted as a fluorescent tube. Is it the light source IO shown by the chain line? These lights are shown in a cross-sectional view, with red (R), green (G), and blue (B) stripes. A color filter line comprising a striped color filter member 22 having a glossy layer 24 20.

As will be described in detail later, the "glossy" layer 24 emphasizes the green part of the color transmission row. The part of the liquid crystal material that corresponds to the stripes of the green filter allows light to be transmitted. Direct the electric field to orient the L, C molecules as such, while the others of the L, C, material The portion remains in a highly light scattering state, which is an unoriented state. light like this The light from source 10 transmits only the green filter stripes, so that the viewer cannot see the image. A green light is provided on one side of the image forming means 40 so that the green light is seen in the transmitting portion of the image. The green light passes through a light diffusing means 30 which diffuses the green light somewhat uniformly.

The red and blue images for each three-color order are The image forming means transmits only those portions of the total image area that are respectively colored. 40, the image is reproduced, and the stripes of the red filter and the blue filter are Light is transmitted through each of the stripes, and the appropriate part of the C “shiny” is oriented. The same is transmitted to the viewer by doing so. Of course, the basic red, green, and blue Those portions of the total image area that require mixing must be filled with the required two or three colors. It is well known that it is possible to transmit color information within one cycle.

The light diffusing means 30 uses a concave lens method to diffuse light as shown by the chain line. Although shown, in practice, e.g. or color filtering A diffuser plate disposed in contact with the image forming means 40 without contacting the means, or a dotted line After passing through the focal plane F-F shown in A Fresnel lens placed at a distance of at least twice its focal length from the stage, or , a series of lenslets having a focal length shorter than the distance of the lenslet surface image forming means. Suitable forms such as lenses can be used. projection system In the system, the two-color shutter is an optical shutter in which the light is almost parallel to the axial direction. It can be conveniently placed in the light collecting part of the.

The image forming means includes the above-mentioned preferred multiplexing, C, display, indium/tin A transparent common electrode 44 of oxide of indium and a transparent pixel electrode 44 of oxide of indium/tin A column of black guest/host liquid crystal material exists between a multiplexed array of 46 poles. It is depicted as a preferred matrix 42 of encapsulated droplets or grains. the above The pixel electrode is placed in the selected pixel, puts the substance in a light transmitting state, and connects the other pixels. electrically addressable field-effect transistors to scatter light. individually controlled by the registers and thus for each transmission of each colored light. It is possible to reproduce the optical transmission image area and generate the golden color of moving images.

A suitable control circuit will pre-switch from start to end according to the pre-scanned image. Switchable L, C, the above-mentioned for controlling "shine" The method can be easily re-invented.

FIG. 2 shows a striped color filter 22 and encapsulated l, , C.

A transparent common electrode 23 shown between a material matrix 24 and a color filtering means 20 The operation is shown in detail. A transparent, elongated electrode 25 receives incident light as indicated by arrow 26. is shown energized to orient the underlying L, C, and materials so as to transmit The stripes in the register match the stripes of the above color filter, which are arranged with green stripes. Arranged in The L C1 substance placed under the other electrode 25 that is not energized is , which is a light-scattering molecular arrangement, is shown in a haphazard arrangement, so that virtually all Avoid transmitting incident light to the red and blue filter stripes.

The electrodes 23 and 25 are attached to the facing surfaces of L, C, and base material 24. or a suitable transparent support such as a glass plate (not shown). It can be held in contact with the recording base material without sticking. − to color filter can be mixed into a separate filter membrane or filter plate 22; It is also possible to adhere or cover the common electrode 23 (or its support), or without adhering to or covering the individual elongated electrodes 25 (or their supports). Wear. For example, colored polyester films or printed with suitable dyes or inks. Suitable materials for color filter stripes, such as stripes, are available from banks skilled in the art. Easy to select.

Interference coatings or plasma-deposited colored coatings can also be used. .

Figure 3 shows the present invention using a dichroic filter and designed to operate at a 45 degree angle. 1 shows a bright projection display device. e.g. quartz halogen with suitable reflector or red, green and blue elements from a light source 50 which is a xenon short arc lamp. (designated r, g, b, respectively in the drawing) is transmitted through a reflector 5 1 and/or an auxiliary lens 52. First dichroic filter 53 reflects the red component but passes the green and blue components. Green and blue required The element is further filtered by dichroic filters 54 and 55 that reflect green and blue, respectively. Separated. Since only the blue component enters the dichroic filter 55, the If desired, the filter 55 can be replaced with a plane mirror. three beads separated horizontally The system further includes dichroic filters 56 and 57 to illuminate the image forming display panel 59. and 58. The dichroic filter 56 reflects red and is a dichroic filter. 57 reflects green light but transmits red light, and dichroic filter 58 reflects blue light. transmits red and green light. Only red light enters the dichroic filter 56. Therefore, the filter 56 can be replaced with a plane mirror if required. Display cell 59 top The image is projected lens 6! is projected onto the screen 60 by.

Blocking the laterally separated beams is preferably as described above and also preferred. Preferably, the L, C, This is done with switchable shutters 62, 63 and 64 made of material. motion Inside, the shutters 62, 63 and 64 are arranged so that red, green and blue are the image forming display cells 5. 9 can be independently switched between light transmitting and light blocking states to controllably illuminate It is. Regarding the previously scanned images, Nyatsuta 62, 63 and 464 respectively contains striped electrodes so that the transparent area of the shutter increases progressively during scanning. You can This means that the information corresponding to that color becomes the information corresponding to the next color. When changed, it provides a downwardly sweeping color border on the imaging display cell 59. this In this case, the light diffusing means 65, such as a diffuser, obscures the details of the striped electrode structure. It can be installed in the light path.

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Claims (18)

[Claims] 1. (1) an image forming means for forming an image; (2) a light source; (3) the light source and the image forming means; fixed filtering means between the image forming means, said filtering means (4) repeats sequences of differently colored light at a rate of at least 30 sequences per second; The color transmission state and the second state are repeatedly changed so that the image is transmitted to the image forming means repeatedly. comprising at least one switchable material arranged to be electrically switched. E.g., said image forming means generates said image for each transmission of differently colored light. A frame order color display system characterized by being able to reproduce images. 2. The color filtering means controls the light transmitted from the light source to the image forming means. Arranged to separate parts horizontally and give each part a different color. Switchable above, with at least two differently colored color filter material areas The substances are each colored by a filter area that passes the colored light through the image-forming hand. 2. The frame order color of claim 1, wherein the frame order color is switchable for selectively transmitting to the stages. display system. 3. that are laterally diffused into each other to a certain extent into the transmission path of the light to the image forming means; 3. A frame according to claim 2, comprising two or more regions of each color. Forward color display system. 4. Claim 3 comprising stripes of respective colors arranged substantially parallel to each other. Includes a frame-order color display system. 5. The above light diffusing means is used to diffuse the respective colored light when operating. Any one of claims 1 to 4, which is arranged between the optical filter region and the image forming means. A frame-order color display system described in Crab. 6. In operation, the light mixing means uses color filtering to mix colored light. 6. The image forming apparatus according to any one of claims 1 to 5, which is arranged between the means and the image forming means. Frame order color display system. 7. Red color frame, green color frame and blue color frame in each order Frame order colors according to any one of claims 1 to 6, arranged so as to be transmittable. display system. 8. The switchable material may be substantially transparent or highly semi-transparent in the color transmission state. transparent and substantially opaque or highly light scattering in the second state 8. A frame order color display system according to any one of claims 1 to 7, which is Mu. 9. A switch according to any one of claims 1 to 8, wherein the switching material comprises a liquid crystal material. frame order color display system. 10. (1) Image forming means for forming an image, (2) Light source, (3) The above light source to horizontally separate a portion of the light transmitted from the image forming means to the image forming means. at least two different color filter materials arranged to impart different colors; (4) fixed color filtering means with each differently colored region; The above-mentioned image-forming hand is capable of reproducing an image for each transmission of colored light. by each colored filter area at a rate of at least 30 sequences per second. between the color transmission state and the second state so that the colored light order is transmitted repeatedly. a liquid crystal material arranged to be electrically switchable between A frame-order color display system. 11. The image forming means comprises a liquid crystal material in a multiplexed pixel array. A frame-order color display system according to any one of claims 1 to 10. 12. The liquid crystal material is in the form of fine droplets or grains dispersed within a polymeric matrix. 12. A frame-order color display system according to claim 9, 10, or 11. 13. Substantially all of the droplets or grains described above are subject to the activation of an applied electric field during use. In the direction of sexualization, the average thickness is 20 micrometers or less, preferably 10 micrometers. 13. The frame sequential color display system of claim 12, wherein the frame sequential color display system is submeter. 14. Claims 9 to 1, wherein the liquid crystal material is in the form of a black guest/host material. 3. The frame order color display system according to claim 3. 15. According to any one of claims 1 to 14, the display device is in the form of a backlight display device. Includes a frame-order color display system. 16. (1) at least two differently colored regions of color filter material; ) to select colored areas that impart color to the light passing through the element in use. and a second state arranged to be electrically switchable between the optical transmission state and the second state. A selection characterized in that it comprises a selection area of liquid crystal material corresponding to a colored area. Target color filter element. 17. 17. A frame according to any one of claims 1 to 16, which is in the form of a front projection display. color display system. 18. 17. A frame according to any one of claims 1 to 16, which is in the form of a rear projection display. color display system.