JP2006184770A - Color image display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize an apparatus to display a color image by projecting three natural color beams on a screen and to reduce costs, and to realize an image display with high resolution. <P>SOLUTION: The color picture display apparatus includes: a light source apparatus 1 in which a first color beam light source, a second color beam light source and a third color beam light source of the three primary colors are adjacently arranged; a lens system 5 which focuses the first color, the second color and the third color beams 2, 3 and 4 emitted in line and in parallel from the light source apparatus 1 on the basis of input video signals R, G and B onto a plotting face 20; and a scanning means 6 which reflects and scans the respective light beams of the first, the second and the third colors 2, 3 and 4 emitted from the lens system 5 onto the plotting face 20. Further, a correction means (control part) 7 is provided which corrects the positional deviations of the respective color light beams emitted from the light source apparatus 1 in line and in parallel to one another, and superimposes the first color projected picture, the second color projected picture, and the third color projected picture on the plotting face 20. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a color image display device that projects a color image onto a screen, and in particular, a color image obtained by two-dimensionally scanning red (R), green (G), and blue (B) light beams on a screen. The present invention relates to a color image display device that draws the image.

  In the conventional laser display devices described in Patent Documents 1 and 2 below, each of an R laser light source that emits red light, a G laser light source that emits green light, and a B laser light source that emits blue light A color image is projected on the screen by reflecting each color beam light emitted from the beam on a scanning means such as a polygon mirror and scanning the screen. The scanning means is not limited to a polygon mirror, but a mirror of another type, for example, a two-dimensional scanning mirror produced using MEMS (Micro Electro Mechanical System) technology as described in Patent Document 3. It is also possible.

  A laser light source used in a conventional laser display device is a fiber that uses red beam light emitted from an R laser light source, green beam light emitted from a G laser light source, and blue beam light emitted from a B laser light source. By passing through an optical system consisting of a waveguide, dichroic mirror, etc., it is combined into one concentric light beam, and then reflected to the mirror, which is a scanning means, and reflected on the screen. An image is projected.

JP-A-4-45478 Japanese Patent Laid-Open No. 2002-344765 JP 2004-264684 A

  The laser light source used in the conventional laser display apparatus has a configuration in which R, G, and B color light beams are combined into one beam light and then output to a mirror that is a scanning unit. However, there is a problem that the apparatus becomes larger and the cost increases.

  For example, considering the application of projecting a color image from a laser display device with a white wall, white plate, etc. everywhere as a screen, the laser display device needs to be portable, and the configuration of the optical system is simple and compact Is preferred. However, when the optical system for multiplexing is omitted, the position of the red light irradiation point position, the green light irradiation point position, and the blue light irradiation point position on the screen at each dot constituting the color image is generated. If it becomes large to some extent, the resolution of the image is degraded.

  An object of the present invention is to provide a color image display device that is small and low-cost, and that can display a color image with high resolution.

  The color image display device of the present invention is based on a light source device in which a first color beam light source of three primary colors, a second color beam light source, and a third color beam light source are arranged adjacent to each other, and an input video signal. A first color beam light, a second color beam light, and a third color beam light emitted from the light source device in parallel in a row on the drawing surface, and emitted from the lens system The first color, the second color, and the third color beam light are reflected on the drawing surface, and the first color, the second color, and the third color beam light are scanned on the drawing surface. Means.

  The color image display device according to the present invention corrects a positional deviation between the first color beam light, the second color beam light, and the third color beam light emitted from the light source device in a row and in parallel, and thereby draws the drawing surface. The image forming apparatus includes a correcting unit that superimposes the first color projection image, the second color projection image, and the third color projection image.

  The correction means of the color image display device of the present invention is configured to calculate a relative delay amount of the video signal input to each of the first color beam light source, the second color beam light source, and the third color beam light source. It is characterized by comprising control means for controlling.

  The correction means of the color image display device of the present invention is characterized by comprising a diffraction grating formed on the reflection surface of the scanning means.

  The correction means of the color image display device of the present invention is characterized by comprising the control means and the diffraction grating.

  In the light source device of the color image display device of the present invention, the first color beam light source, the second color beam light source, and the third color beam light source are arranged adjacent to each other in a line. .

  The scanning means of the color image display device of the present invention scans the first color beam light, the second color beam light, and the third color beam light in a horizontal direction and a vertical direction on the drawing surface. It is characterized by comprising a deflecting mirror.

  The scanning means of the color image display device according to the present invention is configured to scan the first color beam light, the second color beam light, and the third color beam light in a horizontal direction on the drawing surface. It is characterized by comprising a second deflection mirror that scans in the vertical direction with the mirror.

  The color image display device of the present invention is provided at a position in front of the scanning means, and when the beam light scanned in the horizontal direction is detected by the scanning means, the detected position is set as a drawing start end position in the horizontal direction of the color image. It is characterized by comprising a light receiving sensor.

  The color image display device of the present invention is characterized in that the scanning of the scanning means is performed in the horizontal reciprocating row, and the horizontal drawing of the color image is performed in the forward and backward directions.

  According to the present invention, since the laser light sources for the three primary colors are juxtaposed and the beam light for each color is emitted in parallel and projected onto the drawing surface (screen), the configuration of the light source is simple and small, and the manufacturing is performed. Cost is reduced. In addition, in each dot constituting the color image on the drawing surface, the projection point positions of the R, G, and B images are superimposed by the correcting unit, so that the resolution of the image is improved.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a main part configuration diagram of a laser display apparatus constituting a color image display apparatus according to a first embodiment of the present invention. The laser display device includes a laser light source device 1 and red (R) beam light 2, green (G) beam light 3, and blue (B) beam light 4 emitted from the laser light source device 1 on the surface of the screen 20. A condensing lens system 5, and a deflecting mirror 6 that reflects the R, G, and B color beam lights 2, 3, and 4 collected by the lens system 5 while scanning in a two-dimensional manner and projects the reflected light onto the screen 20. And a control unit 7 for controlling the input timing of the video signals R, G, B input to the laser light source device 1. As the deflection mirror 6, for example, a known polygon mirror or the mirror described in Patent Document 3 described above can be used.

  FIG. 2 is a schematic front view of the laser light source device 1. A pedestal 9 is horizontally provided in the cylindrical stem 8, on which a red light laser light source 10 that emits red beam light 2 to the front side of the paper surface and a green light laser that emits green beam light 3. A light source 11 and a blue laser beam source 12 that emits the blue beam light 4 are provided adjacent to each other. The laser light sources 10, 11, and 12 are provided adjacent to one line in the horizontal direction. This “horizontal direction” is the horizontal scanning direction (X direction) on the screen 20 in the present embodiment.

  The control unit 7 in FIG. 1 includes a delay circuit 13 provided in the input stage of the red light laser light source 10, a delay circuit 14 provided in the input stage of the green light laser light source 11, and an input stage of the blue light laser light source 12. And a timing control means 16 for controlling the delay timing of each of the delay circuits 13, 14, 15. The video signals R, G, and B, which are electrical signals, are input to the delay circuits 14, 15, and 16, respectively, and when the video signals R, G, and B are output from the delay circuits 14, 15, and 16, the corresponding laser light source 10. , 11 and 12 emit light beams 2, 3 and 4.

  As shown in FIG. 2, the red light beam 2, the green beam light 3, and the blue beam light 4 are emitted in parallel from the laser light source device 1 in the present embodiment, and are collected by the lens system 5 common to each color, Reflected by the deflecting mirror 6 and projected onto the screen 20, each color laser light source 10, 11, 12 has a horizontal displacement, and each beam light 2, 3, 4 on the movable deflecting mirror 6. Since the incident angles are different from each other, the projection point positions of the dots when the color image is drawn on the screen are shifted by R, G, and B.

  That is, when the video signals R, G, and B for displaying a certain dot are incident on the respective color laser light sources 10, 11, and 12 at the same timing as shown in FIG. 3, the projection point position of the dot on the screen 20 is determined. , R, G, B. There is no problem when the positional deviation is small, but the positional deviation of R, G, and B on the screen 20 is large depending on the distance to the screen 20 and the distance between the laser light sources 10, 11, and 12 in the laser light source device 1. As a result, the resolution of the color image deteriorates. Therefore, in this embodiment, the control unit 7 in FIG. 1 controls the input timing of the video signals R, G, and B to the respective color laser light sources 10, 11, and 12 at each dot, and the R of each dot on the screen 20. , G, and B are controlled so that the projection point positions coincide.

  FIG. 4 is an explanatory diagram of timing control performed by the control unit 7. In the present embodiment, in the arrangement of the respective color laser light sources 10, 11, and 12 shown in FIG. 2, a red light projection image and a blue light projection image are projected onto the green light projection image emitted from the central green light laser light source 11. The delay timing of each delay circuit 13, 14, 15 is controlled so that the image overlaps.

  In the example shown in FIG. 4, when the color beam lights 2 and 3 are projected at the same timing, the red projection image R projected on the screen ahead of the green projection image G is projected on the screen with a delay. The delay amount of the delay circuit 13 is set longer than the delay amount of the delay circuit 14 so as to overlap the green projection image G. Further, when the color beam lights 3 and 4 are projected at the same timing, the blue projection image B projected on the screen with a delay from the green projection image G is projected in advance on the screen. The delay amount of the delay circuit 15 is set shorter than the delay amount of the delay circuit 14 so as to overlap with G.

  As a result, there is an instantaneous difference in the arrival time of the R, G, B light on the screen 20 at each dot constituting the color image, but the R, G, B light is visually projected on the same dot visually. In addition, the resolution of the color image is increased.

  The delay amounts of the delay circuits 13, 14, and 15 are preferably adjusted so that the projected images of R, G, and B coincide with each other at infinity, but the function of manually adjusting according to the distance to the screen. May be provided. Further, since it is only necessary to delay the video signal of the other color with respect to the video signal of the most preceding color, it is only necessary to provide two delay circuits instead of providing a delay circuit for each color. In the example of FIG. 4, the delay circuit 15 can be omitted.

(Second Embodiment)
FIG. 5 is a configuration diagram of a main part of a laser display device which is a color image display device according to the second embodiment of the present invention. In the present embodiment, the control unit 7 used in the first embodiment of FIG. 1 is not employed, but a deflection mirror 21 with a grating (diffraction grating) is used instead of the deflection mirror 6. The configuration is the same as in the first embodiment.

  The deflecting mirror 21 with a grating can be realized by vapor-depositing a large number of stripe patterns as a diffraction grating 22 on a two-dimensional type mirror described in Patent Document 3, for example. The R, G, and B beam lights 2, 3, and 4 emitted from the respective color laser light sources 10, 11, and 12 and incident on the deflecting mirror 21 with a grating at the same timing differ depending on the wavelength difference of the beam lights 2, 3, and 4. Since the light is reflected at the reflection angle, the diffraction grating 22 is formed so that the R, G, and B lights coincide at infinity.

  As a result, even if there is a positional shift in the arrangement positions of the respective color laser light sources 10, 11, and 12 in the laser light source device 1, the R, G, and B projection point positions can be made to coincide with each other on the screen. High-resolution color images can be displayed.

  In the present embodiment, the diffraction grating 22 is provided in a deflection mirror that can swing the mirror in both the X direction (horizontal direction) and the Y direction (vertical direction), that is, capable of two-dimensional scanning. In order to accurately match the projection point positions on the R, G, and B screens, the first deflection mirror that scans the mirror in the X direction and the second deflection mirror that scans the mirror in the Y direction are separately provided. The diffraction grating 22 perpendicular to the oscillation direction is provided on each of the deflection mirrors, and the respective color beam lights 2, 3, and 4 emitted from the laser light sources 10, 11, and 12 are sequentially reflected by both deflection mirrors. It is good also as a structure projected on the screen 20. FIG.

  In this embodiment, since the reflection angles of the R, G, and B light are changed by the diffraction grating, the green laser light source 11 having an intermediate wavelength is used in each color laser light source 10, 11, and 12 shown in FIG. It needs to be installed in the middle. On the other hand, in the first embodiment, the arrangement order of the respective color laser light sources 10, 11, and 12 is arbitrary.

(Third embodiment)
In the second embodiment described above, the diffraction grating 22 is provided on the deflecting mirror 21, but once the diffraction grating 22 is formed, the interval and the like are unchanged and cannot be changed and adjusted. For this reason, depending on the position where the screen 20 is provided, a noticeable positional deviation may occur at the projection point positions of R, G, and B. For this reason, in 3rd Embodiment, the control part 7 similar to 1st Embodiment is provided in the laser display apparatus of 2nd Embodiment. As a result, it is possible to correct a slight misalignment of the projection point position of the R, G, B light on the screen.

(Fourth embodiment)
In the laser light source device 1 used in each of the embodiments described above, the color laser light sources 10, 11, and 12 are arranged in a line, that is, in a straight line as shown in FIG. 2, but the color laser light sources 10, 11, and 12 are arranged in a straight line. It may not be possible to place them. For example, in order to realize the green light source 11 with a small size comparable to the red light source 10 and the blue light source 12, a laser light source that emits a laser beam having a wavelength of 1060 nm and a laser beam having a wavelength of 1060 nm are used. A configuration is possible in which a wavelength conversion element that converts (green) laser light is arranged in series and the red light laser light source 10 and the blue light laser light source 12 are juxtaposed thereto. In this case, it is necessary to devise the arrangement position of the heat sink for cooling, and it may be difficult to arrange the laser light sources 10, 11, 12 of each color on a straight line.

  In such a case, the small red light laser light source 10 and the blue light laser light source 12 are arranged in a straight line, and the green beam light 3 is inserted in parallel between the red beam light 2 and the blue beam light 4. This can be solved by providing the optical system in the front part of the laser light source device 1. An example of this optical system is shown in FIG.

  The optical system shown in FIG. 6A includes a square prism body 26 having a dichroic mirror 25 that is inclined at 45 degrees, reflects green light, and transmits red light and blue light, and green beam light 3. The mirrors 27 and 28 are reflected to enter the dichroic mirror 25 at an angle of 45 degrees. By using such an optical system, as shown in FIG. 6 (b), it becomes possible to arrange the R, G, and B beam lights 2, 3, and 4 in a line and in parallel, 2, it can be used as the laser light source device 1 of each of the third embodiments. Alternatively, the green beam light 3 may be incident on one fiber, and the outgoing end of the fiber may be disposed at an intermediate position between the red laser light source 10 and the blue laser light source 12.

(Fifth embodiment)
FIG. 7 is a block diagram of a main part of a laser display device which is a color image display device according to the fifth embodiment of the present invention. Compared to the first embodiment, the difference is that photosensors 30 and 31 are provided at predetermined positions on the exit side of the deflection mirror 6. In the present embodiment, the deflection mirror 6 is swung in the horizontal direction (X direction) to scan the R, G, and B color beam lights 2, 3, and 4 on the screen 20 in a reciprocating manner. A color image is drawn every time. At this time, the color image may be misaligned in the vertical direction. Therefore, the drawing start position of each row is detected by the photosensors 30 and 31, and the color image is drawn starting from the time when the photosensors 30 and 31 detect the beam light. As a result, it is possible to prevent positional deviation of the image in the vertical direction.

  Further, in the reciprocating swinging operation of the deflection mirror 6, the linearity of the swinging operation of the drawing position on the left end side of the screen and the drawing position on the right end side of the screen is lowered. Therefore, by stopping drawing when the photosensors 30 and 31 have not yet detected the beam lights 2, 3, and 4, in addition to preventing misalignment, distortion at the left and right end portions of the color image can be prevented.

  In the present embodiment, since the scanning in the vertical direction (Y direction) is performed simultaneously with the scanning in the horizontal direction (X direction) by the deflecting mirror 6, the photosensors 30, 31 are slightly longer in the vertical direction. Even if the deflection mirror 6 is swung in the vertical direction, it is necessary that the photosensors 30 and 31 can detect the beam lights 2, 3 and 4.

  If two horizontal scanning and vertical scanning are separately provided as the deflection mirror, the photosensors 30 and 31 may be arranged in front of the horizontal scanning deflection mirror, and the vertical direction. It is not necessary to use a longitudinal photosensor.

  In the present embodiment, the photo sensor 31 is provided in addition to the photo sensor 30 in order to perform image drawing in both horizontal scanning and backward scanning. In this case, the photo sensor 31 is not necessary.

  According to the present invention, since a high-resolution color image can be drawn with a small size and at low cost, it is particularly useful as a portable color image display device.

It is a principal part block diagram of the color image display apparatus which concerns on the 1st Embodiment of this invention. It is a front schematic diagram of the laser light source device shown in FIG. It is a figure which shows the position shift of each color projection image on a screen when the laser light source for each color of red, green, and blue is excited at the same timing. It is operation | movement explanatory drawing of the control part in the 1st Embodiment of this invention. It is a principal part block diagram of the color image display apparatus which concerns on the 2nd Embodiment of this invention. It is explanatory drawing of the optical system used in the 4th Embodiment of this invention. It is a principal part block diagram of the color image display apparatus which concerns on the 5th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laser light source device 2 Red beam light 3 Green beam light 4 Blue beam light 5 Lens system 6 Deflection mirror (scanning means)
7 Control unit 10 Red laser light source 11 Green light laser light source 12 Blue light laser light source 13, 14, 15 Delay circuit 16 Timing control means 21 Deflection mirror with grating (scanning means)
22 grating (diffraction grating)
30, 31 Photo sensor (light receiving sensor)

Claims (10)

  A light source device in which a first color beam light source of three primary colors, a second color beam light source, and a third color beam light source are arranged adjacent to each other, and in parallel from the light source device based on an input video signal A lens system for condensing the first color beam light, the second color beam light, and the third color beam light on the drawing surface, and the first and second colors emitted from the lens system. And scanning means for reflecting the light beams of the third color on the drawing surface and scanning the light beams of the first color, the second color, and the third color on the drawing surface. Color image display device.   The projection of the first color on the drawing surface by correcting the positional deviation of the first color beam light, the second color beam light, and the third color beam light emitted from the light source device in a row and in parallel. The color image display apparatus according to claim 1, further comprising a correcting unit that superimposes the image, the second color projection image, and the third color projection image.   The correction means includes control means for controlling a relative delay amount of the video signal input to each of the first color beam light source, the second color beam light source, and the third color beam light source. The color image display device according to claim 2.   The color image display device according to claim 2, wherein the correction unit includes a diffraction grating formed on a reflection surface of the scanning unit.   The color image display device according to claim 2, wherein the correction unit includes the control unit according to claim 3 and the diffraction grating according to claim 4.   6. The light source device according to claim 1, wherein the first color beam light source, the second color beam light source, and the third color beam light source are arranged adjacent to each other in a line. The color image display device according to any one of the above.   The scanning unit includes a deflection mirror that scans the first color beam light, the second color beam light, and the third color beam light in a horizontal direction and a vertical direction on the drawing surface. The color image display device according to claim 1, wherein the color image display device is a color image display device.   The scanning means scans the first color beam light, the second color beam light, and the third color beam light in a vertical direction with a first deflection mirror that scans the drawing surface in a horizontal direction. The color image display device according to any one of claims 1 to 6, wherein the color image display device comprises two deflection mirrors.   A light receiving sensor provided at a position in front of the scanning unit and having the detection position as a drawing start end position in the horizontal direction of a color image when the beam light scanned in the horizontal direction by the scanning unit is detected; The color image display device according to any one of claims 1 to 8.   The scanning of the scanning means is performed in the horizontal reciprocating row, and the horizontal drawing of the color image is performed in each of the reciprocating rows. Color image display device.

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