CN100370307C - Light tuning method and device base on colour splitting mirror stack - Google Patents
Light tuning method and device base on colour splitting mirror stack Download PDFInfo
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- CN100370307C CN100370307C CNB2004100483785A CN200410048378A CN100370307C CN 100370307 C CN100370307 C CN 100370307C CN B2004100483785 A CNB2004100483785 A CN B2004100483785A CN 200410048378 A CN200410048378 A CN 200410048378A CN 100370307 C CN100370307 C CN 100370307C
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Abstract
The present invention relates to a light adjusting method and a light adjusting device on the basis of a color dividing mirror stack, which is characterized in that a color dividing mirror stack is used for adjusting light through color division, a moving white light band is arranged at one side of an entrance window, and the process in which the white light band moves at a uniform speed from the lower end of the entrance window to the top of the entrance window in the moving direction from bottom to top is controlled; in the moving process, the part which overflows from the top of the entrance window quickly jumps back to the lower end of the entrance window and continues to move at the uniform speed from bottom to top to carry out continuous circulating scanning; after entering the color dividing mirror stack, the moving white light band is divided into a red light band, a green light band and a blue light band which are in parallel, and the simultaneous equivalent continuous directional scanning of the red, green and blue light bands is realized; in the scanning process, the widths of each of the light bands of the red, green and blue light bands are not changed, the size and the position of the scanning area of the red, green and blue light bands are not changed, and however, the red, green and blue light bands are orderly rolled in the scanning area.
Description
Technical field
The present invention relates to a kind of light-dimming method and light modulating device based on Color splitting mirror stack, this method and device can be separated into three kinds of color light belts arranged side by side of red, green, blue with the white light band that moves, and equivalent continuously-directional scanning when the scanning window place of Color splitting mirror stack realizes red, green, blue three coloured light bands; In scanning process, described red, green, blue three coloured light bands light belt width separately is constant, and the size and location of described red, green, blue three coloured light band scanning areas are constant, but red, green, blue three coloured light bands roll in scanning area in regular turn.
Background technology
Large screen display historical remote has projection type to show and kind such as plane matrix type demonstration, and present main product is the rear-projection demonstration.In various projector (ray machine), all want coloured separation and look combining optical.Existing look isolation technics has multiple scheme, and the three-plate type projector has three looks to decompose synthetic colour splitting prism mode, liquid crystal colour cast light optical filtering mode.The one-board projector has the holograph optical filtering mode and the field sequence look mode of high-resolution display board.Field sequence look mode is that bluish-green red three primary colors are shown in proper order by 1/3rd times of one respectively.The main product of projector is an one-board now, mainly be to adopt three-colour filter colour wheel mode in the one-board projector, this mode is because optical filter can only make monochromatic light pass through, and all the other light are absorbed (or reflecting away), therefore the utilization factor of white light can only be below 1/3rd, and the light loss more than 2/3rds is arranged.
Improving optical efficiency is the world subject in current projection ray machine field, in order to improve the utilization factor of light, recently the look separation and the scanning technique of rotating three four prisms invented by Philips company, the look that the rotation cylindrical mirror has been invented by Samsung company separates and scanning technique, realize raising white light utilization factor, reduce the purpose of light loss, but all there has been complex structure in these two kinds of schemes, problems such as volume is big, and price is expensive.For seeking more simple method, need to propose a kind of light-dimming method and light modulating device based on Color splitting mirror stack.
Summary of the invention
The objective of the invention is to propose a kind of light-dimming method and light modulating device based on Color splitting mirror stack, this method and device can be separated into three kinds of color light belts arranged side by side of red, green, blue with the white light band that moves, and equivalent continuously-directional scanning when the scanning window place of Color splitting mirror stack realizes red, green, blue three coloured light bands; In scanning process, described red, green, blue three coloured light bands light belt width separately is constant, and the size and location of described red, green, blue three coloured light band scanning areas are constant, but red, green, blue three coloured light bands roll in scanning area in regular turn.
First purpose of the present invention is realized by following technical proposals: a kind of light modulation based on Color splitting mirror stack
Method, its concrete steps are:
Use a Color splitting mirror stack to carry out the color separation light modulation, this Color splitting mirror stack is provided with five tactic prisms and at least five layers of color separation deielectric-coating at least, described prism and the alternate setting of described color separation deielectric-coating, described color separation deielectric-coating is a Red Green Blue color separation deielectric-coating, the effectively logical light area of described three primary colors color separation deielectric-coating equates, the plane of described Color splitting mirror stack one side is a white light band scanning entrance window, with perpendicular another face of described entrance window on form the walk abreast scanning window of light belt of the red, green, blue that equates with the entrance window area;
In described entrance window one side a mobile white light band is set, the length of described white light band and described entrance window length coupling, the width of described white light band equates with the width of the plane of incidence of described prism, control white light band is by direction of motion is at the uniform velocity mobile to the entrance window top from the entrance window lower end from bottom to top, in moving process, the part of overflowing the entrance window top entrance window lower end that snaps back is continued at the uniform velocity mobilely from bottom to top, carries out continuous scan round;
Described mobile white light band is separated into three kinds of color light belts arranged side by side of red, green, blue after entering Color splitting mirror stack, and equivalent continuously-directional scanning when the scanning window place of Color splitting mirror stack realizes red, green, blue three coloured light bands; In scanning process, described red, green, blue three coloured light bands light belt width separately is constant, and the size and location of described red, green, blue three coloured light band scanning areas are constant, but red, green, blue three coloured light bands roll in scanning area in regular turn.
Another object of the present invention is realized by following technical proposals: a kind of light modulating device based on Color splitting mirror stack, a Color splitting mirror stack is arranged, this Color splitting mirror stack is provided with five tactic prisms and at least five layers of color separation deielectric-coating at least, described prism and the alternate setting of described color separation deielectric-coating, described color separation deielectric-coating is red, green, primary colors color separation deielectric-coating, the effectively logical light area of described three primary colors color separation deielectric-coating equates, the plane of described Color splitting mirror stack one side is a white light band scanning entrance window, with perpendicular another face of described entrance window on form equate with the entrance window area red, green, the scanning window of blue parallel light belt; Entrance window one side at described Color splitting mirror stack is provided with a mobile light belt generator; Described generator can produce the beam of white light that at the uniform velocity moves in proper order by from bottom to top.
Compared with the prior art the present invention has following advantage:
1, because the present invention utilizes the optical characteristics of prism and color separation deielectric-coating, incident white light band is separated into simultaneously the light belt arranged side by side of three kinds of colors of red, green, blue, and project simultaneously on the pictcure generator (as Lcos, DMD etc.), the loss of light seldom, the time of light and space availability ratio are all very high.
2, it is clear straight that the present invention makes red green blue tricolor light belt separatrix in scanning.
3, of the present invention simple in structure, easy to process, volume is little, and is in light weight.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1-5, optical scanning process synoptic diagram of the present invention
Fig. 6, Color splitting mirror stack structural representation of the present invention
Two of Fig. 7, Color splitting mirror stack embodiment of the present invention
Fig. 8, light modulating device structural representation of the present invention
Fig. 9, spirality minute surface synoptic diagram of the present invention (A of Fig. 8 is to view)
Two of the embodiment of Figure 10, spirality minute surface of the present invention
Two of Figure 11, light modulating device embodiment of the present invention
Two the annular minute surface synoptic diagram of Figure 12, light modulating device embodiment of the present invention
Three of Figure 13, light modulating device embodiment of the present invention
Three the rotation cylinder mirror intention of Figure 14, light modulating device embodiment of the present invention
Four of Figure 15, light modulating device embodiment of the present invention
Four the rotating prism synoptic diagram of Figure 16, light modulating device embodiment of the present invention
Embodiment
Referring to Fig. 1-Fig. 5, a kind of light-dimming method based on Color splitting mirror stack, its concrete steps are:
Use a Color splitting mirror stack to carry out the color separation light modulation, this Color splitting mirror stack is provided with five tactic prisms and at least five layers of color separation deielectric-coating at least, described prism and the alternate setting of described color separation deielectric-coating, described color separation deielectric-coating is a Red Green Blue color separation deielectric-coating, the effectively logical light area of described three primary colors color separation deielectric-coating equates, the plane of described Color splitting mirror stack one side is a white light band scanning entrance window, with perpendicular another face of described entrance window on form the walk abreast scanning window of light belt of the red, green, blue that equates with the entrance window area;
In described entrance window one side a mobile white light band is set, the length of described white light band and described entrance window length coupling, the width of described white light band equates with the width of the plane of incidence of described prism, control white light band is by direction of motion is at the uniform velocity mobile to the entrance window top from the entrance window lower end from bottom to top, in moving process, the part of overflowing the entrance window top entrance window lower end that snaps back is continued at the uniform velocity mobilely from bottom to top, carries out continuous scan round;
Described mobile white light band is separated into three kinds of color light belts arranged side by side of red, green, blue after entering Color splitting mirror stack, and equivalent continuously-directional scanning when the scanning window place of Color splitting mirror stack realizes red, green, blue three coloured light bands; In scanning process, described red, green, blue three coloured light bands light belt width separately is constant, and the size and location of described red, green, blue three coloured light band scanning areas are constant, but red, green, blue three coloured light bands roll in scanning area in regular turn.
Wherein, Fig. 1 shows the scanning entrance window lower end incident of mobile white light band 21 from Color splitting mirror stack 20, and at the uniform velocity mobile to its top, forms red R, green G, the parallel light belt of blue B in the scanning area at the scanning window place of Color splitting mirror stack.Colour light band order from front to back is a red, green, blue.Wherein, the white light bandwidth is 1/3rd of a described entrance window height.
Fig. 2 shows the scanning entrance window medium position of mobile white light Tape movement to Color splitting mirror stack, at this moment, forms red, green, blue three coloured light bands at the scanning window place of Color splitting mirror stack and rolls in regular turn in scanning area, and its position changes.Colour light band order from front to back is green, blue, red.
Fig. 3 shows that mobile white light Tape movement is to scanning position, entrance window middle and upper part, this position just in time is in two positions between the prism, at this moment, form red, green, blue three coloured light bands at the scanning window place of Color splitting mirror stack and roll in regular turn in scanning area, its position changes.Colour light band order from front to back is green, blue, red, green.The size and location of described red, green, blue three coloured light band scanning areas are constant, and the overall width of light belt is constant, only are two fillets before and after green light belt is divided into.
Fig. 4 shows that mobile white light Tape movement to scanning entrance window upper position, at this moment, forms red, green, blue three coloured light bands at the scanning window place of Color splitting mirror stack and rolls in regular turn in scanning area, its position changes.Colour light band order from front to back is blue, red, green.
Fig. 5 shows mobile white light Tape movement to scanning entrance window apical position, and at this moment, part white light band overflows from the entrance window top, and described part of overflowing the entrance window top entrance window lower end that snaps back is continued at the uniform velocity mobile from bottom to top.The red, green, blue three coloured light bands that form at the scanning window place of Color splitting mirror stack roll in scanning area in regular turn, and colour light band order from front to back is blue, red, green, blue.The size and location of described red, green, blue three coloured light band scanning areas are constant, and the overall width of light belt is constant, only are two fillets before and after blue light belt is divided into.
Referring to Fig. 6, in the present embodiment, have five tactic prisms, by ordering from bottom to top, first prism 1 is a prism, its cross section is equilateral triangle, and second prism 2 is four prisms, and its cross section is isosceles trapezoid, the 3rd prism 3 is four prisms, its cross section is trapezoidal, and the 4th prism 4 and the 5th prism 5 all are four prisms, and its cross section is trapezoidal.This Color splitting mirror stack is a Color splitting mirror stack that is cuboid, the plane of this Color splitting mirror stack one side is a white light band scanning entrance window 101, with perpendicular another face of described entrance window on form the walk abreast scanning window 102 of light belt of the red, green, blue that equates with the entrance window area.
In the present embodiment, have five layers of color separation deielectric-coating, by ordering from bottom to top, ground floor 6 is red color separation deielectric-coating, and the second layer 7 is green color separation deielectric-coating, and the 3rd layer 8 is blue color separation deielectric-coating, the 4th layer 9 is red color separation deielectric-coating, and layer 5 10 is green color separation deielectric-coating.Described every layer of color separation deielectric-coating all is to be combined with each other by multilayer film, and described every layer of color separation deielectric-coating uses ripe technology attached to described prism surface, and then in regular turn prism become Color splitting mirror stack with the optics glue bond.The normal of described color separation deielectric-coating and described entrance window shape in an angle, this angle is 1 °-45 °, present embodiment adopts 45 °.
In the present embodiment, the multilayered medium membrane technology (Dichroicmirror) that described color separation deielectric-coating is a kind of maturation, be a kind of optical thin film, its function be the colorama reflection (can reach more than 95%) of certain wavelength and certain bandwidth in the white light of irradiation on it and all smooth former road of remaining light by (can reach more than 95%).The thickness of selection different refractivity medium, each layer medium and the number of plies etc. can be determined catoptrical wavelength, bandwidth and reflectivity etc. to certain incident angle white light.In the Color splitting mirror stack of invention its centre wavelength of red, green, blue color separation deielectric-coating of using for example can select 640,550,470 nanometers (nm) respectively and corresponding bandwidth as 600nm more than, 80nm and below the 500nm, like this visible light is almost all used.
Referring to Fig. 7, in another embodiment of the present invention, use a color separation heap that is cuboid to carry out the color separation light modulation, this color separation heap is provided with 11 tactic prisms and eleventh floor color separation deielectric-coating, and the width of described white light band is the sixth of described entrance window height.
Referring to Fig. 8, a kind of light modulating device based on Color splitting mirror stack, a Color splitting mirror stack 30 is arranged, this Color splitting mirror stack is provided with five tactic prisms and at least five layers of color separation deielectric-coating at least, described prism and the alternate setting of described color separation deielectric-coating, described color separation deielectric-coating is red, green, primary colors color separation deielectric-coating, the effectively logical light area of described three primary colors color separation deielectric-coating equates, the plane of described Color splitting mirror stack one side is a white light band scanning entrance window, with perpendicular another face of described entrance window on form equate with the entrance window area red, green, the scanning window of blue parallel light belt; Entrance window one side at described Color splitting mirror stack is provided with a mobile light belt generator; Described generator can produce the beam of white light that at the uniform velocity moves in proper order by from bottom to top.Described mobile light belt generator has the microscope base 34 of a rotation, and this microscope base is provided with and is the spirality minute surface 31 that rotates ascendant trend, and this minute surface top is provided with a rectangular shaped light source 33, and the light belt 32 that this light source sends projects on the described minute surface.Form a projection area 39.The turning axle of described microscope base and the entrance window of described Color splitting mirror stack have an angle, and this angle is 45 °.Described microscope base bottom is connected with drive motor 35 power, and this drive motor is fixed on the erecting frame 36, and the other end of this erecting frame is fixed with Color splitting mirror stack, is provided with pictcure generator 37 (as Lcos, DMD etc.) below the scanning window of this Color splitting mirror stack.
Referring to Fig. 9, the figure illustrates the Facad structure situation of spirality minute surface, this minute surface is one 360 ° a spiral, its position 38 and 0 ° of degree position at 360 ° is end to end.When minute surface during with microscope base 34 rotation, the light belt 32 that described rectangular shaped light source is sent projects and forms projection area 39 on the minute surface, and the position of this projection area is fixed, and the white light band that is gone out by this direct reflection scans the entrance window of Color splitting mirror stack.Thus, can control the white light band by direction of motion is at the uniform velocity mobile to the entrance window top from the entrance window lower end from bottom to top, in moving process, the part of overflowing the entrance window top entrance window lower end that snaps back is continued at the uniform velocity mobilely from bottom to top, carries out continuous scan round.
Referring to Figure 10, the figure illustrates the unitized construction of three spirality minute surfaces, in the present embodiment, the minute surface of three same structures has been installed on the microscope base 34 of rotation, promptly minute surface 311,312,313.Three minute surfaces are end to end, and each minute surface can be finished once from the scanning of entrance window lower end to the entrance window top.Under same rotating speed, the minute surface of this structure can improve the sweep velocity of mobile light belt.
Referring to Figure 11, in the present embodiment, described mobile light belt generator has a base 36, this base is provided with a turning axle, three disks 40 are housed on this turning axle, be respectively equipped with annular minute surface on this disk, this minute surface top is provided with a rectangular shaped light source, and described turning axle is connected with drive motor 35.
Referring to Figure 12, in the present embodiment, three disks all are to be made by transparent material, and divide three layers to install and fix with one heart, rotate synchronously along same rotation center, are installed in the annular minute surface 411 that is coated with meniscus shaped on the disk 401 of bottom, and reference position is 0 °.Be installed on the disk 402 in middle level and be coated with falculate annular minute surface 412, reference position is 0 °.Be installed in the annular minute surface 413 that is coated with the hook shape on the disk 403 of top layer, 0 ° of reference position.
Referring to Figure 13 and Figure 14, in the present embodiment, described mobile light belt generator has a base 36, the cylindrical mirror 50 of a rotation is housed on this base, the cylinder of this rotation cylindrical mirror is pressed helix and is changed, this minute surface top is provided with a rectangular shaped light source, and described base is provided with drive motor 53, and this drive motor is connected with rotation cylindrical mirror power by driving belt 51, driving pulley 53, negative pulley wheel 57.This rotation cylindrical mirror is installed by central shaft 56 and base, this rotation cylindrical mirror has a minute surface 55 that changes by the equidistant helix rule, its central part is a cylinder, the tabular body 54 that its outer end is a light-permeable, white light can be throwed in this tabular body inboard, and its outer field coating is that the emission minute surface can reflected white-light.
Referring to Figure 15 and Figure 16 (Figure 16 is that the C of Figure 15 is to partial view), in the present embodiment, described mobile light belt generator has a base 36, and bearing 60 is housed on this base, and a bearing seat 61 is installed on the bearing, there is the prism 63 of two microscope bases 62 and a rotation to be adhesively fixed, this microscope base is provided with semiaxis, by this semiaxis prism 63 is installed on the bearing seat, and described base is provided with drive motor 64, this drive motor is connected with a microscope base power, can drive the prism rotation.This prism rear is provided with a rectangular shaped light source 33, this prism is one four prism, when turning clockwise under the drive of four prisms at drive motor, to its projection white light band, this prism can make incident white light band convert the white light band of upper and lower translation to rectangular shaped light source from this prism rear.This white light band is the rebound lower end along Color splitting mirror stack translation from bottom to top to the upper end.In the present embodiment, described prism can be four prisms, also can be six prisms, can also be eight prisms.
Claims (9)
1. light-dimming method based on Color splitting mirror stack is characterized in that:
Use a Color splitting mirror stack to carry out the color separation light modulation, this Color splitting mirror stack is provided with five tactic prisms and at least five layers of color separation deielectric-coating at least, described prism and the alternate setting of described color separation deielectric-coating, described color separation deielectric-coating is a Red Green Blue color separation deielectric-coating, the effectively logical light area of described three primary colors color separation deielectric-coating equates, the plane of described Color splitting mirror stack one side is a white light band scanning entrance window, with perpendicular another face of described entrance window on form the walk abreast scanning window of light belt of the red, green, blue that equates with the entrance window area;
In described entrance window one side a mobile white light band is set, the length of described white light band and described entrance window length coupling, the width of described white light band equates with the width of the plane of incidence of described prism, control white light band is by direction of motion is at the uniform velocity mobile to the entrance window top from the entrance window lower end from bottom to top, in moving process, the part of overflowing the entrance window top entrance window lower end that snaps back is continued at the uniform velocity mobilely from bottom to top, carries out continuous scan round;
Described mobile white light band is separated into three kinds of color light belts arranged side by side of red, green, blue after entering Color splitting mirror stack, and equivalent continuously-directional scanning when the scanning window place of Color splitting mirror stack realizes red, green, blue three coloured light bands; In scanning process, described red, green, blue three coloured light bands light belt width separately is constant, and the size and location of described red, green, blue three coloured light band scanning areas are constant, but red, green, blue three coloured light bands roll in scanning area in regular turn.
2. light-dimming method according to claim 1, it is characterized in that: use a Color splitting mirror stack that is cuboid to carry out the color separation light modulation, this Color splitting mirror stack is provided with five tactic prisms and five layers of color separation deielectric-coating, and the width of described white light band is 1/3rd of a described entrance window height.
3. light-dimming method according to claim 1, it is characterized in that: use a color separation heap that is cuboid to carry out the color separation light modulation, this color separation heap is provided with 11 tactic prisms and eleventh floor color separation deielectric-coating, and the width of described white light band is the sixth of described entrance window height.
4. light modulating device based on Color splitting mirror stack, it is characterized in that: a Color splitting mirror stack is arranged, this Color splitting mirror stack is provided with five tactic prisms and at least five layers of color separation deielectric-coating at least, described prism and the alternate setting of described color separation deielectric-coating, described color separation deielectric-coating is red, green, primary colors color separation deielectric-coating, the effectively logical light area of described three primary colors color separation deielectric-coating equates, the plane of described Color splitting mirror stack one side is a white light band scanning entrance window, with perpendicular another face of described entrance window on form equate with the entrance window area red, green, the scanning window of blue parallel light belt; Entrance window one side at described Color splitting mirror stack is provided with a mobile light belt generator; Described generator can produce the beam of white light that at the uniform velocity moves in proper order by from bottom to top.
5. light modulating device according to claim 4, it is characterized in that: described mobile light belt generator has the microscope base of a rotation, this microscope base is provided with the spirality minute surface, this minute surface top is provided with a rectangular shaped light source, the turning axle of described microscope base and the entrance window of described Color splitting mirror stack have an angle, and described microscope base bottom is provided with drive motor.
6. light modulating device according to claim 4, it is characterized in that: described mobile light belt generator has a base, this base is provided with a turning axle, three disks are housed on this turning axle, be respectively equipped with annular minute surface on this disk, this minute surface top is provided with a rectangular shaped light source, and described turning axle is connected with drive motor.
7. light modulating device according to claim 4, it is characterized in that: described mobile light belt generator has a base, the cylindrical mirror of a rotation is housed on this base, the cylinder of this rotation cylindrical mirror is pressed helix and is changed, this minute surface top is provided with a rectangular shaped light source, and described base is provided with drive motor.
8. light modulating device according to claim 4 is characterized in that: described mobile light belt generator has a base, and the prism of a rotation is housed on this base, and this prism rear is provided with a rectangular shaped light source, and described base is provided with drive motor.
9. light modulating device according to claim 8 is characterized in that: the rotating prism of adorning on the base is four prisms or six prisms or eight prisms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100483785A CN100370307C (en) | 2004-06-30 | 2004-06-30 | Light tuning method and device base on colour splitting mirror stack |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100483785A CN100370307C (en) | 2004-06-30 | 2004-06-30 | Light tuning method and device base on colour splitting mirror stack |
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| Publication Number | Publication Date |
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| CN1715994A CN1715994A (en) | 2006-01-04 |
| CN100370307C true CN100370307C (en) | 2008-02-20 |
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| CNB2004100483785A Expired - Fee Related CN100370307C (en) | 2004-06-30 | 2004-06-30 | Light tuning method and device base on colour splitting mirror stack |
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| CN107991769B (en) * | 2018-01-12 | 2020-07-10 | 凝辉(天津)科技有限责任公司 | Two-dimensional scanning device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4709144A (en) * | 1986-04-02 | 1987-11-24 | Hewlett-Packard Company | Color imager utilizing novel trichromatic beamsplitter and photosensor |
| JPS6344602A (en) * | 1986-08-12 | 1988-02-25 | Seiko Epson Corp | Dichroic mirror |
| JPH04338739A (en) * | 1991-05-16 | 1992-11-26 | Seiko Epson Corp | Projection type liquid crystal display device |
| JP2000137220A (en) * | 1998-10-30 | 2000-05-16 | Nec Corp | Single plate type liquid crystal projector |
| JP2000221079A (en) * | 1998-12-23 | 2000-08-11 | Hewlett Packard Co <Hp> | Color separator for scanning image having four colors or more |
| GB2354658A (en) * | 1999-09-27 | 2001-03-28 | Adi Corp | Reflective type of liquid crystal display projection system |
-
2004
- 2004-06-30 CN CNB2004100483785A patent/CN100370307C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4709144A (en) * | 1986-04-02 | 1987-11-24 | Hewlett-Packard Company | Color imager utilizing novel trichromatic beamsplitter and photosensor |
| JPS6344602A (en) * | 1986-08-12 | 1988-02-25 | Seiko Epson Corp | Dichroic mirror |
| JPH04338739A (en) * | 1991-05-16 | 1992-11-26 | Seiko Epson Corp | Projection type liquid crystal display device |
| JP2000137220A (en) * | 1998-10-30 | 2000-05-16 | Nec Corp | Single plate type liquid crystal projector |
| JP2000221079A (en) * | 1998-12-23 | 2000-08-11 | Hewlett Packard Co <Hp> | Color separator for scanning image having four colors or more |
| GB2354658A (en) * | 1999-09-27 | 2001-03-28 | Adi Corp | Reflective type of liquid crystal display projection system |
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