JP2009109962A - Rear projector device and multi-display system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rear projector device and a multi-display system that are capable of precisely adjusting a screen. <P>SOLUTION: An optical sensor 17 is disposed so that it can be inserted into and removed from an optical path between a projection lens 2 and a screen 4. A reference pattern in all white (white 100%) is displayed on the screen 4 by controlling all micro-reflection mirrors of a DMD 15 so that they reflect light in an on-direction. In this condition, an optical sensor 17 detects the intensity for light beams of respective colors in red (R), green (G), white (W), and blue (B) transmitted by being passed through a color wheel 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rear projection type rear projector device and a multi-display system that forms a single large screen by combining a plurality of rear projector devices.

  Recently, traffic control centers and the like have used large-screen monitors for displaying traffic conditions. Such large-screen monitors can be combined with multiple rear-projection rear projectors. A display system is used.

  The rear projector device sequentially projects light emitted from the light source onto RGB (red, green, blue) transmissive color filters to obtain light of each color of RGB (red, green, blue), and the light of each color. Is reflected on the screen in units of pixels using a DMD (Digital Micromirror Device) to form a color image, and a combination of a plurality of such rear projector devices forms a single large-screen multi-display system. To make up.

  By the way, when one large screen is configured by combining a plurality of such rear projector apparatuses, the brightness of the color image formed by each rear projector apparatus is determined due to individual differences in light sources and optical components used in each rear projector apparatus. The sheath color may not match. In other words, if the brightness of the light source in each rear projector device and the transmittance of optical components such as color filters vary, the screen brightness and color of each rear projector device may differ (color shift). When one screen is constituted by the rear projector device, there is a problem that the entire image becomes very difficult to see.

Therefore, conventionally, when a single screen is configured by combining a plurality of displays as disclosed in Patent Document 1, each display screen is photographed by a camera, and an image for each display is based on data captured from the camera. A method of matching the white balance and gamma characteristics of all displays by controlling the signal amplification factor and gamma correction has been considered.
JP-A-6-217336

  However, in such a method of Patent Document 1, the screen displayed on the display is imaged by the camera, and the measurement data output from the camera includes a lot of noise on the screen of the display. There was a problem that it was difficult to obtain good data and the screen adjustment of each display could not be made accurately.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rear projector device and a multi-display system that can perform screen adjustment with high accuracy.

  The invention according to claim 1 has a light source; at least each color of red (R), green (G), and blue (B), light from the light source is transmitted, and light of each color is emitted in order. A plurality of filters; a light modulation unit that modulates the light of each color emitted from the plurality of filters with an image signal; a screen on which the light of each color modulated by the light modulation unit is projected; And a light detecting means for detecting the intensity of the light of each color emitted from the filter.

  The light detection means detects the intensity of the light of each color emitted from the plurality of filters in a state where the white modulation reference pattern is displayed on the screen by the light modulation means. It is possible to adjust at least one of brightness and color shift for each color displayed on the screen by a detection signal of the detected light intensity of each color.

  The light detection means is also characterized in that it can be inserted / removed on an optical path between the projection lens and the screen.

  The plurality of filters include a white filter that transmits light from a light source and emits white (W) light, and light that is transmitted through the white filter that emits white (W) light by a light detection unit. The intensity of leakage light is detected, and the brightness of the screen screen by the light of the light source can be adjusted by this detection signal.

  The light detection means is also characterized in that it is arranged on the side of an optical path between a plurality of filters and the light modulation means.

  The plurality of filters to which the white filter is added are arranged along the circumferential direction of the rotatable disc-shaped wheel, and the transmitted light from the white filter is converted into the light of the light from the light source by the rotation of the disc-shaped wheel. It is characterized in that leakage light is detected by the light detection means when positioned on the road.

  The invention according to claim 7 has a light source; and at least each color of red (R), green (G), and blue (B), light from the light source is transmitted, and light of each color is emitted in order. A plurality of filters; light modulation means for modulating the light of each color emitted from the plurality of filters with an image signal; a screen on which the light of each color modulated by the light modulation means is projected; and the light modulation And a plurality of rear projector devices each including a plurality of rear projector devices configured to detect light intensities of the respective colors projected onto the screen by means, and a plurality of rear projector devices each set as a master device and a slave device. In the display system, the rear projector device set as the master device detects the light detection means detected in all the rear projector devices. Brightness information for each color from the signal, and a correction target value is set from the collected brightness information, and the brightness for each color on the screen screen is set in all rear projector devices based on the correction target value. And at least one of color misregistration is adjusted.

  The rear projector device set as the master device is characterized in that the lowest luminance value among the luminance information for each color detected by the light detection means of all the rear projector devices is set as the correction target value. .

  The rear projector device set as the master device determines the color misregistration for each color of the luminance information detected by the light detection means of all the rear projector devices, and sets the one with the largest color misregistration as the correction target value. It is characterized by that.

  ADVANTAGE OF THE INVENTION According to this invention, the rear projector apparatus and multi-display system which can perform a screen adjustment accurately can be provided.

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

(First embodiment)
FIG. 1 shows a schematic configuration of a multi-display system configured by a rear projector apparatus according to the first embodiment of the present invention. In this case, the multi-display system constitutes a multi-display system having a 2 × 2 large screen by combining a plurality of (four in the illustrated example) rear projector apparatuses 100 to 400.

  FIG. 2 shows a schematic configuration of the rear projector apparatus. FIG. 2 shows the rear projector device 100. In the figure, 1 is an apparatus body, and this apparatus body 1 allows light emitted from a light source to pass through a transmissive color filter of red, green, and blue (RGB) and a transparent filter of white (W) in order, While generating the light of each color, these light is reflected per pixel by DMD, and is radiate | emitted from the projection lens 2. FIG. Details of the apparatus main body 1 will be described later.

  A reflection mirror 3 is disposed in the output light path of the projection lens 2, and a screen 4 is disposed in the reflection light path of the reflection mirror 3. The reflection mirror 3 reflects the light of each color emitted from the projection lens 2 and projects a color image on the screen 4 from the back side.

  FIG. 3 is a diagram for explaining the configuration of the apparatus main body 1 of the rear projector apparatus 100 in more detail. In FIG. 3, the same parts as those in FIG.

  In FIG. 3, reference numeral 11 denotes a light source. The light source 11 includes a lamp 11a such as an ultra-high pressure mercury lamp, and a reflection mirror 11b for irradiating light from the lamp 11a in a predetermined direction.

  On the optical path of light from the light source 11, a disk-shaped color foil 12 is arranged. As shown in FIG. 4, a plurality of the color foils 12 are arranged along the circumferential direction. Here, the red (R) transmissive color filter 12a, the green (G) transmissive color filter 12b, and the white (W) A 4-segment filter in which a transparent filter 12c and a blue (B) transmissive color filter 12d are arranged is used. Further, the color wheel 12 is provided with a rotation shaft 12e at the center, and is rotationally driven in the illustrated arrow direction at a constant speed (for example, 7200 rpm) via the rotation shaft 12e by a drive motor (not shown). In other words, the color foil 12 rotates to convert the light emitted from the light source 11 into a red (R) transmissive color filter 12a, a green (G) transmissive color filter 12b, and a white (W) transparent filter. The light is transmitted in the order of 12c and blue (B) transmissive color filter 12d.

  The optical path that has passed through the red (R) transmissive color filter 12a, the green (G) transmissive color filter 12b, the white (W) transparent filter 12c, and the blue (B) transmissive color filter 12d includes a lens. A DMD 15 as light modulation means is disposed through the system 13 and the prism 14. The lens system 13 and the prism 14 include a red (R) transmissive color filter 12a, a green (G) transmissive color filter 12b, a white (W) transparent filter 12c, and a blue (B) transmissive color filter 12d. The transmitted red (R), green (G), white (W), and blue (B) light is guided to the DMD 15. The DMD 15 modulates each light of red (R), green (G), white (W), and blue (B) with an image signal. In this case, the DMD 15 is a two-dimensional arrangement of fine micro-reflecting mirrors on a silicon wafer. Each micro-reflecting mirror corresponds to a pixel constituting one image and is deflected at a high speed of about 10 μS. In operation, incident light is reflected in two directions (on / off), and an image is expressed by reflected light in the on direction.

  A DMD control unit 16 is connected to the DMD 15. An image signal is input to the DMD controller 16 from a main device (not shown), and the red (R) transmissive color filter 12a, the green (G) transmissive color filter 12b of the color foil 12 are received by the image signal, For each light of red (R), green (G), white (W) and blue (B) introduced through the white (W) transparent filter 12c and the blue (B) transmissive color filter 12d Then, the reflection in the ON direction at each micro reflection mirror of the DMD 15 is controlled. Further, the DMD control unit 16 has a function of correcting the reflected light in the ON direction by, for example, a micro-reflecting mirror and adjusting the brightness and color components of the light by a correction signal input from a main device (not shown). .

  The projection lens 2 is disposed in the optical path of the reflected light in the ON direction of the DMD 15. The projection lens 2 expands the reflected light in the ON direction of the DMD 15. Then, the light that is enlarged and emitted from the projection lens 2 is reflected by the reflection mirror 3 and projected onto the back surface of the screen 4, thereby displaying a color image on the screen 4.

  On the optical path between the DMD 15 and the screen 4 (in the illustrated example, the optical path between the reflection mirror 3 close to the screen 4 and the projection lens 2), an optical sensor 17 is disposed so as to be removable. . The light sensor 17 has four channels of red, green, blue and transparent filters, and red (R) introduced through the color foil 12 through the channels of the red, green, blue and transparent filters. The light intensities of green (G), white (W), and blue (B) are detected.

  Further, as shown in FIG. 5, the optical sensor 17 is provided at the tip of the arm 19 connected to the rotation shaft 18a of the micromotor 18 as a driving source, and is always at the position of the broken line in the drawing, and is introduced through the color foil 12. When the light intensity of red (R), green (G), white (W), and blue (B) is detected, it is moved to the position indicated by the solid line by the rotation of the rotating shaft 18a driven by the micromotor 18 and reflected. It is located on the optical path between the mirror 3 and the projection lens 2. In this case, the arm 19 is fixed by a fixing mechanism (not shown) so that the optical sensor 17 does not move when the optical sensor 17 is positioned on the front surface of the projection lens 2.

  Although the rear projector device 100 has been described above, the same applies to the other rear projector devices 200 to 400.

  Next, the operation of the embodiment configured as described above will be described.

  First, normal use of displaying an image on the screen 4 will be described. In this case, the optical sensor 17 is set at a broken line position shown in FIG. In this state, the light emitted from the light source 11 is transmitted at a constant speed by the red (R) transmissive color filter 12a of the color foil 12, the green (G) transmissive color filter 12b, and the white (W). The light passes through the transparent filter 12 c and the blue (B) transmissive color filter 12 d in order, and enters the DMD 15 through the lens system 13 and the prism 14. In addition, an image signal is input to the DMD control unit 16 from a main device (not shown). Then, the red (R) transmissive color filter 12a, the green (G) transmissive color filter 12b, the white (W) transparent filter 12c, and the blue (B) transmissive color filter of the color foil 12 are obtained by this image signal. Reflection in the ON direction at each micro-reflecting mirror of the DMD 15 is controlled for red (R), green (G), white (W), and blue (B) light transmitted through 12d. The reflected light in the on direction of the DMD 15 is enlarged and emitted from the projection lens 2, reflected by the reflection mirror 3, and a color image is displayed on the screen 4.

  Next, a description will be given of a case where brightness and color components for red (R), green (G), white (W), and blue (B) lights displayed on the screen 4 are adjusted. In this case, the arm 19 is rotated by driving the micromotor 18 so that the optical sensor 17 is positioned on the solid line position shown in FIG. 5, that is, on the optical path between the projection lens 2 and the reflection mirror 3.

  In this state, light (R) transmissive color filter 12a, green (G) transmissive color filter 12b, and white (W) transparent filter of color foil 12 that rotates light from light source 11 at a constant speed. The transmissive color filter 12d of 12c and blue (B) is sequentially transmitted, and red (R), green (G), white (W), and blue (B) lights are incident on the DMD 15. Further, a reference signal is input as an image signal to the DMD control unit 16 from a main device (not shown). In this case, the reference signal displays a reference pattern of all white (white 100%) on the screen 4. The DMD control unit 16 controls all the micro-reflecting mirrors of the DMD 15 to reflect in the ON direction based on the reference signal at this time, and red (R), green (G), introduced through the color foil 12, Reflected light of each light of white (W) and blue (B) is emitted from the projection lens 2 and a reference pattern of all white (white 100%) is displayed on the screen 4.

  In this state, red (R), green (G), white (W), and blue (B) light introduced from the reflected light emitted from the projection lens 2 by the optical sensor 17 through the color foil 12 is introduced. Detect intensity. In this case, the optical sensor 17 determines the intensity of red (R), green (G), white (W), and blue (B) light introduced in synchronization with the rotation of the color foil 12 as red, green, and blue. Detect by each channel of the transparent filter. The detection signal of the optical sensor 17 is sent to a main device (not shown).

  In the main apparatus, between the rear projector apparatuses 100 to 400, the detection signals for red (R), green (G), white (W), and blue (B) from the respective optical sensors 17 of the rear projector apparatuses 100 to 400 are used. The brightness and color shift of each of red (R), green (G), white (W), and blue (B) are determined, and a correction signal corresponding to the determination result is generated to generate each rear projector apparatus 100. Input to the DMD controller 16 of .about.400.

  As a result, in each of the rear projector apparatuses 100 to 400, the DMD control unit 16 corrects the reflected light in the ON direction at the micro reflection mirror of the DMD 15, and the red of the color foil 12 is displayed on each screen of all the rear projector apparatuses 100 to 400. (R) transmissive color filter 12a, green (G) transmissive color filter 12b, white (W) transmissive color filter 12c, and blue (B) transmissive color filter 12d are introduced and displayed on the screen 4. The brightness and color shift (color component shift) for each of the red (R), green (G), white (W), and blue (B) lights are adjusted to be the same (in this case, the brightness It is also possible to adjust either the thickness or the color misregistration).

  Therefore, in this way, the optical sensor 17 is detachably disposed on the optical path between the DMD 15 and the screen 4, and all the micro reflection mirrors of the DMD 15 are controlled to be reflected in the ON direction. A reference pattern of all white (100% white) is displayed on the screen 4, and in this state, red (R), green (G), and white (W) introduced through the color foil 12 by the optical sensor 17 The intensity of each light of blue (B) is detected. As a result, the photosensor 17 is reflected light in the ON direction of the DMD 15 and is introduced from the color foil 12 from the light emitted from the projection lens 2 and projected onto the screen 4 (red (R), green (G), white ( Since it is possible to directly detect the intensity of each light of W) and blue (B), it is possible to obtain an accurate detection signal that does not include noise, and display on the screen 4 by using such a detection signal. The brightness and color misregistration of each of red (R), green (G), white (W), and blue (B) light can be adjusted with high accuracy.

  In addition, the detection of the intensity of each light of red (R), green (G), white (W), and blue (B) by the optical sensor 17 is performed at a position close to the screen 4 on which the image is displayed. A high detection result can be obtained, and the brightness and color can be adjusted accurately according to the actual use state.

(Second Embodiment)
Next, a second embodiment of the present invention will be described.

  FIG. 6 shows a schematic configuration of a rear projector apparatus according to the second embodiment of the present invention, and the same parts as those in FIG.

  In this case, an optical sensor 20 is disposed as a light detection means on the side of the optical path between the color foil 12 and the DMD 15 (in the illustrated example, on the side of the optical path between the color foil 12 and the lens system 13). Yes. The optical sensor 20 detects leakage light of light emitted from the light source 11, and blocks light introduced into the DMD 15 (light used for color image creation) out of light transmitted through the color foil 12. It is arranged at a position where there is no leakage, that is, a position where leakage light can be detected. The spectral response characteristic of the optical sensor 20 includes the wavelength range of the transmitted light of the white (W) transparent filter 12c of the color foil 12, and is synchronized with the white (W) transparent filter 12c of the color foil 12, for example. Then, the intensity of the leakage light of white (W) light transmitted through the transparent filter 12c is detected. In other words, the optical sensor 20 has the intensity of the leakage light of the white (W) light transmitted through the transparent filter 12c when the white (W) transparent filter 12c of the color foil 12 is positioned on the optical path of the light from the light source 11. From the above, the brightness of the lamp 11a of the light source 11 is detected. In this case, in order to detect only the leakage light of the light transmitted through the transparent filter 12c by the optical sensor 20, for example, white (W) is transparent with reference to an index (marking) (not shown) set on the color foil 12. The position information of the filter 12c is acquired, and the leakage light when the white (W) transparent filter 12c is positioned on the optical path of the light from the light source 11 may be detected based on the position information.

  Also in this case, when an image signal is input to the DMD control unit 16 as described above, red (R), which is reflected from the color foil 12 by the reflection in the ON direction of each micro reflection mirror of the DMD 15 by the image signal. A color image is displayed on the screen 4 under the control of green (G), white (W), and blue (B) light.

  In order to detect the brightness of the lamp 11a of the light source 11 from this state, when the white (W) transparent filter 12c of the color foil 12 rotated at a constant speed is positioned on the optical path of the light from the light source 11, The light sensor 20 detects the intensity of white (W) light leaking through the transparent filter 12c. The detection signal of the optical sensor 20 is sent to a main device (not shown).

  In the main apparatus, the brightness deviation of the lamp 11a between the rear projector apparatuses 100 to 400 is determined from the detection signals from the respective optical sensors 20 of the rear projector apparatuses 100 to 400, and a correction signal corresponding to the determination result is generated. Generated and input to each of the rear projector apparatuses 100 to 400. Accordingly, in each of the rear projector apparatuses 100 to 400, for example, the DMD control unit 16 corrects the reflected light in the ON direction at the micro reflection mirror of the DMD 15 according to the input correction signal, and the lamp 11a of the light source 11 is corrected. The brightness by light is adjusted, and the screens 4 of all the rear projector apparatuses 100 to 400 are adjusted to have uniform brightness. In this case, the brightness of the lamp 11a of the light source 11 may be directly adjusted.

  Therefore, in this way, the intensity of the leakage light of white (W) light transmitted through the transparent filter 12c in synchronization with the transparent filter 12c of the color foil 12 is detected by the optical sensor 20, and based on this detection signal. The brightness of the lamps 11a of the rear projector apparatuses 100 to 400 is adjusted. Thereby, even if the brightness of the lamps 11a of the light sources 11 of the rear projector apparatuses 100 to 400 varies due to deterioration over time, the screens 4 of all the rear projector apparatuses 100 to 400 so as to eliminate these variations. The screen brightness can be adjusted to be the same.

  In addition, the optical sensor 20 blocks the light introduced into the DMD 15 (light used for color image creation) out of the light transmitted through the color foil 12 on the side of the optical path between the color foil 12 and the DMD 15. Therefore, the brightness of the screen 4 can be adjusted without affecting the color image projected on the screen 4. Thereby, the brightness of the screen screen of each rear projector apparatus 100 to 400 can be adjusted even when the apparatus is actually used.

  In the second embodiment described above, when the white (W) transparent filter 12c of the color foil 12 is positioned on the optical path of the light from the light source 11, the white (W) light transmitted through the transparent filter 12c. The light sensor 20 detects the intensity of the leaked light, but the other filter of the color foil 12, the red (R) transmissive color filter 12a, the green (G) transmissive color filter 12b, and the blue (B Red (R), green (G), and blue (B) light leaking through the transmissive color filter 12d) is also transmitted through the red (R) transmissive color filter 12a and green (G) transmissive type. When the color filter 12b and the blue (B) transmissive color filter 12d are positioned on the optical path of the light from the light source 11, the light sensor 20 detects the intensity of the leaked light of the transmitted light. Kill. In this case as well, in order to detect only the leakage light of the light transmitted through the red (R) transmissive color filter 12a, the green (G) transmissive color filter 12b, and the blue (B) transmissive color filter 12d, respectively. , A red (R) transmissive color filter 12a, a green (G) transmissive color filter 12b, and a blue (B) transmissive color filter based on an index (marking) (not shown) set on the color foil 12. 12d is acquired, and based on this position information, a red (R) transmissive color filter 12a, a green (G) transmissive color filter 12b, and a blue (B) transmissive color filter 12d, What is necessary is just to detect the leak light when located on the optical path of the light from the light source 11 by the optical sensor 20.

  In this way, the detection signal of the photosensor 20 detected for each of the red (R) transmissive color filter 12a, the green (G) transmissive color filter 12b, and the blue (B) transmissive color filter 12d can be obtained. By comparing with a reference value prepared in advance, the state deterioration of each of the red (R) transmissive color filter 12a, the green (G) transmissive color filter 12b, and the blue (B) transmissive color filter 12d is obtained. It can be detected separately.

Furthermore, in the second embodiment described above, the optical sensor 20 detects the leakage light of the white (W) light transmitted through the transparent filter 12c. However, the optical sensor 20 leaks the light from the lamp 11a of the light source 11. If it is light, it may not be the light which permeate | transmits the transparent filter 12c. (Third embodiment)
Next, a third embodiment of the present invention will be described.

  FIG. 7 shows a schematic configuration of a multi-display system according to the third embodiment of the present invention, and the same components as those in FIG.

  In this case, the multi-display system includes four rear projector devices 100 to 400, of which the rear projector device 100 is set as a master device, and the other rear projector devices 200 to 400 are set as slave devices. ing.

  In the rear projector device 100, a DMD control unit 16 is connected to the DMD 15. An image signal is input to the DMD control unit 16 from a main device (not shown) via the control unit 22, and red (R), green (G), which are introduced through the color foil 12 by the image signal. The reflection in the on direction at each micro-reflecting mirror of the DMD 15 is controlled for each light of white (W) and blue (B). Further, the DMD control unit 16 has a function of correcting reflected light in the ON direction by, for example, a micro reflection mirror based on a correction signal input from the control unit 22 and adjusting the brightness and color shift of the light projected on the screen 4. have.

  A controller 22 is connected to the DMD controller 16. An optical sensor 17 is connected to the control unit 22 as light detection means. The optical sensor 17 is as described in the first embodiment, and is on the optical path between the DMD 15 and the screen 4 (in the illustrated example, the optical path between the reflection mirror 3 close to the screen 4 and the projection lens 2). ) Is detachably arranged. The light sensor 17 has four-channel filters of red, green, blue and transparent filters, and red (R) introduced from the color foil 12 through the filters of the respective channels of red, green, blue and transparent filters. , Green (G), white (W), and blue (B) light is detected. FIG. 8 shows an example of the spectral response characteristic of the optical sensor 17. The spectral response characteristic (sensor sensitivity) 31 of the red filter is the transmitted light (radiation) of the red (R) transmissive color filter 12 a of the color foil 12. The spectral response characteristic (sensor sensitivity) 33 of the green filter includes the wavelength region 34 of the transmitted light (radiant intensity) of the green (G) transmission color filter 12b of the color foil 12. The spectral response characteristic (sensor sensitivity) 35 of the blue filter includes the wavelength range 36 of the transmitted light (radiant intensity) of the blue (B) transmission color filter 12c of the color foil 12, and the spectral response characteristic ( The sensor sensitivity 37 is a wavelength region 32 of the transmitted light (radiant intensity) of the red (R), green (G), and blue (B) transmissive color filters 12a, 12b, and 12c of the color foil 12. 34 and 36 is intended to include all. The optical sensor 17 can be inserted into and removed from the optical path as described with reference to FIG.

  The control unit 22 starts capturing image signals from a main device (not shown), and controls the entire device including the above-described optical sensor 17, color foil 12, DMD control unit 16, micromotor 18, and the like. An information conversion unit 221, a first correction target setting unit 222, a second correction target setting unit 223, and a correction amount generation unit 224 are included. The luminance information conversion means 221 converts each detection signal detected from the red, green, and blue channels of the optical sensor 17 into luminance information corresponding to the light intensity. The first correction target setting means 222 is used when set in the master device (in this case, the projector device 100), and corresponds to the red, green, and blue channels of the optical sensor 17 of the master device itself. Each color (RGB) includes luminance information and luminance information corresponding to each of the red, green, and blue channels of each light sensor 17 collected from other projector devices (here, projector devices 200 to 400) set as slave devices. Each of these colors is set as the first correction target value with the lowest luminance value among the luminance information. The second correction target setting means 223 is also used when set in the master device (in this case, the projector device 100), and the luminance information corresponding to the red, green, and blue channels of the master device itself. And the luminance information corresponding to each of the red, green, and blue channels of the optical sensor 17 collected from other projector apparatuses (here, the projector apparatuses 200 to 400) set as slave apparatuses, for each color (RGB). Then, the state of the color component, that is, the color misregistration is determined for each of these red, green, and blue colors, and the one having the largest color misregistration is set as the second correction target value. The second correction target setting means 223 will be described later. The correction amount generation means 224 generates a luminance value correction amount and a color misregistration correction amount for each color based on the first and second correction target values set in the master device.

  Although the rear projector device 100 has been described above, the other rear projector devices 200 to 400 have the same configuration. In this case, the rear projector apparatuses 100 to 400 are connected to each other by the communication line 23 between the control units 22 so that information can be exchanged between the master apparatus and the slave apparatus.

  Next, the operation of the embodiment configured as described above will be described.

  First, normal use for displaying a color image on the screen 4 will be described.

  In this case, the optical sensor 17 is set at a broken line position shown in FIG. In this state, the light emitted from the light source 11 is transmitted at a constant speed by the red (R) transmissive color filter 12a of the color foil 12, the green (G) transmissive color filter 12b, and the white (W). The light passes through the transparent filter 12 c and the blue (B) transmissive color filter 12 d in order, and enters the DMD 15 through the lens system 13 and the prism 14. Further, an image signal is input from the control unit 22 to the DMD control unit 16. Then, the red (R) transmissive color filter 12a, the green (G) transmissive color filter 12b, the white (W) transparent filter 12c, and the blue (B) transmissive color filter of the color foil 12 are obtained by this image signal. Reflection in the ON direction at each micro-reflecting mirror of the DMD 15 is controlled for red (R), green (G), white (W), and blue (B) light transmitted through 12d. The reflected light in the on direction of the DMD 15 is enlarged and emitted from the projection lens 2, reflected by the reflection mirror 3, and a color image is displayed on the screen 4.

  Next, the case where the brightness and color shift for each color (RGB) of the color screen displayed on the screen 4 of each of the rear projector apparatuses 100 to 400 is adjusted will be described.

  In this case, for all the rear projector apparatuses 100 to 400, the arm 19 is rotated by driving the micromotor 18, and the optical sensor 17 is positioned on the solid line shown in FIG. 5, that is, on the optical path between the projection lens 2 and the reflecting mirror 3. To be located.

  In this state, light (R) transmissive color filter 12a, green (G) transmissive color filter 12b, and white (W) transparent filter of color foil 12 that rotates light from light source 11 at a constant speed. The transmissive color filter 12d of 12c and blue (B) is sequentially transmitted, and red (R), green (G), white (W), and blue (B) lights are incident on the DMD 15. Further, a reference signal is input as an image signal from the main device (not shown) to the DMD control unit 16 via the control unit 22. In this case, the reference signal displays a reference pattern of all white (white 100%) on the screen 4. The DMD control unit 16 controls all the micro-reflecting mirrors of the DMD 15 to reflect in the ON direction based on the reference signal at this time, and red (R), green (G), introduced through the color foil 12, Reflected light of each light of white (W) and blue (B) is emitted from the projection lens 2 and a reference pattern of all white (white 100%) is displayed on the screen 4.

  In this state, red (R), green (G), white (W), and blue (B) that have passed through the color foil 12 emitted from the projection lens 2 through the red, green, and blue channels of the optical sensor 17. Each light is detected. The detection signal of the optical sensor 17 is converted into luminance information by the luminance information converting means 221 of the control unit 22. The operation so far is performed simultaneously for all the rear projector apparatuses 100 to 400. Then, the luminance information for each color converted by the luminance information conversion unit 221 is collected from the slave device (projector devices 200 to 400) to the control unit 22 of the master device (projector device 100) via the communication line 23. In the projector device 100, the first correction target setting means 222 performs luminance information corresponding to the red, green, and blue channels of the optical sensor 22 of the master device itself, and another projector device set here as a slave device (here. Then, the luminance information corresponding to each of the red, green, and blue channels of the optical sensor 17 collected from the projector apparatuses 200 to 400) is focused on for each color (RGB), and the luminance value is included in the luminance information for each color. The smallest value is set as the first correction target value. The first correction target value is returned to each control unit 22 of the slave device (projector devices 200 to 400) via the communication line 23, including the control unit 22 of the projector device 100. Thereby, the correction amount generation means 224 of the control unit 22 of the projector devices 100 to 400 compares the first correction target value from the master device (projector device 100) with the luminance information detected by each device itself. A luminance value correction amount is generated for each color of RGB.

  The correction amount of the luminance value for each of these RGB colors is different for each projector apparatus 100 to 400. These correction amounts are input to the DMD control unit 16 as correction signals. As a result, in the rear projector apparatuses 100 to 400, each DMD control unit 16 corrects the reflected light in the ON direction at the micro-reflecting mirror of the DMD 15, and adjusts the brightness of the RGB colors emitted from the projection lens 2. Then, the brightness of each of the RGB colors on the screen 4 of all the rear projector apparatuses 100 to 400 is adjusted to be the same.

  On the other hand, the luminance information of each RGB color collected by the control unit 22 of the master device (projector device 100) from each slave device (projector devices 200 to 400) via the communication line 23 is sent to the second correction target setting means 223. Entered. The second correction target setting means 223 collects luminance information corresponding to each of the red, green, and blue channels of the master device itself and other projector devices (here, projector devices 200 to 400) set as slave devices. Focusing on the luminance information corresponding to the red, green, and blue channels of the photosensor 17 for each color (RGB), judging the color misregistration for each color of red, green, and blue, the one with the largest color misregistration Is set as the second correction target value.

  Here, the concept of color misregistration will be described. In this case, each color of RGB can be represented by an orthogonal coordinate system including an R axis, a G axis, and a B axis as shown in FIG. In this orthogonal coordinate system, for example, when red (R) is described, when the color component is only red, it can be represented by a straight line along the R axis. For example, green (G) and blue (B) components The red color (R1) having a color shift mixed with can be represented by the illustrated triangles (r1, g1, b1). Here, (0-g1) represents the amount of deviation of the green (G) component, and (0-b1) represents the amount of deviation of the blue (B) component. The deviation amounts of these green (G) and blue (B) components are detected together with the detection signal for the red light detected by the red channel of the optical sensor 22 and the green detected by the green and blue channels of the optical sensor 22, respectively. , Detected from the detection signal for each blue light.

  Similarly, red (R2) having other color misregistration can be represented by a triangle (r2, g2, b2). Again, (0-g2 (= g1)) represents the amount of deviation of the green (G) component, and (0-b2) represents the amount of deviation of the blue (B) component. When these (R1) and (R2) are compared, the amount of deviation of the green (G) component is the same for both (R1) and (R2), but the amount of deviation of the blue (B) component is different, and (R2) is , (R1) has a larger shift amount. Accordingly, the (R2) shift amount (here, the shift amount of the blue (B) component) having a large color shift at this time is set as the second correction target value. Although red is described here, color misregistration is similarly determined for the other green and blue, and the one with the largest color misregistration is set as the second correction target value for each color.

  These second correction target values are sent back to each control unit 22 of the slave device (projector devices 200 to 400) via the communication line 23, including the control unit 22 of the projector device 100. Thereby, in the correction amount generation means 224 of each control unit 22 of the projector devices 100 to 400, the second correction target value from the master device (projector device 100) and the color shift for each color detected by each device itself. In comparison, a correction amount of color misregistration is generated for each color of RGB.

  The amount of correction for color misregistration for each of these RGB colors differs for each projector apparatus 100-400. These correction amounts are input to the DMD control unit 16 as correction signals. As a result, in the rear projector apparatuses 100 to 400, the reflected light in the ON direction at the micro reflection mirror of the DMD 15 is corrected by the respective DMD control units 16, and the color misregistration of each RGB color emitted from the projection lens 2 is adjusted. As a result, all the rear projector apparatuses 100 to 400 are adjusted so that the color shifts of the RGB colors on the screen 4 are the same.

  Accordingly, in this way, the optical sensor 17 is detachably disposed on the optical path between the DMD 15 and the screen 4, and the color foil 12 is transmitted through the red, green, and blue channels of the optical sensor 17. Red (R), green (G), white (W), and blue (B) light is detected, and brightness information for each color based on these detection signals is collected for all rear projector apparatuses 100 to 400, The lowest luminance value among the luminance information for each color is set as the first correction target value, and the correction amount of the luminance value is generated in each projector apparatus 100 to 400 with respect to the first correction target value. Then, the brightness of each color of RGB emitted from the projection lens 2 of each rear projector apparatus 100 to 400 is adjusted based on this correction amount, and all the rear projector apparatuses 100 are adjusted. Of 400, RGB brightness of each color on the screen of the screen 4 is made to be the same. As a result, for example, the red (R) transmissive color filter 12a, the green (G) transmissive color filter 12b, and the blue (B) transmissive color filter 12d of the color foil 12 are deteriorated due to changes over time, and light is transmitted. Even if a situation occurs in which the brightness of each color on the screen 4 formed by the rear projector apparatuses 100 to 400 does not match, the situation is quickly resolved, and the rear projector apparatuses 100 to 400 The brightness of each color of RGB on the screen screen can be adjusted with high accuracy.

  Further, the color misregistration is determined for each of the red, green, and blue colors from the luminance information corresponding to the red, green, and blue channels of the optical sensor 17 collected from the rear projector apparatuses 100 to 400, and the color misregistration is the largest. Is set as a second correction target value, and a correction amount of a luminance value is generated in each projector apparatus 100 to 400 with respect to the second correction target value, and each rear projector apparatus 100 to The color shifts of the RGB colors emitted from the 400 projection lenses 2 are adjusted so that the color shifts of the RGB colors on the screen 4 of all the rear projector apparatuses 100 to 400 are the same. As a result, even if a color shift of each RGB color occurs on the screen 4 due to a change over time and the state of each color on the screen 4 formed by the rear projector devices 100 to 400 varies, In addition, the color misregistration of each of the RGB colors on the screen screens of the rear projector apparatuses 100 to 400 can be adjusted with high accuracy.

  Furthermore, the luminance information detected by the optical sensor 17 is acquired at a position close to the screen 4 on which the image is projected, and can be obtained as highly accurate information in accordance with the image projected on the screen 4. Screen adjustment in each rear projector apparatus 100 to 400, that is, adjustment of brightness and color misregistration of each color on the screen screen of each rear projector apparatus 100 to 400 can be accurately performed.

  In addition, this invention is not limited to the said embodiment, In the implementation stage, it can change variously in the range which does not change the summary. For example, in the above-described embodiment, the color foil 12 has a red (R) transmissive color filter 12a, a green (G) transmissive color filter 12b, a white (W) transparent filter 12c, and a blue (B) transmission. A four-segment filter having a color filter 12d is described, but a three-segment filter having a red (R) transmissive color filter, a green (G) transmissive color filter, and a blue (B) transmissive color filter. , Red (R) transmissive color filter, green (G) transmissive color filter, blue (B) transmissive color filter, red (R) transmissive color filter, green (G) transmissive color filter It can also be applied to a 6-segment filter having a blue (B) transmission color filter.

  Furthermore, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and is described in the column of the effect of the invention. If the above effect is obtained, a configuration from which this configuration requirement is deleted can be extracted as an invention.

The figure which shows schematic structure of the multi-display system comprised by the rear projector apparatus which concerns on the 1st Embodiment of this invention. 1 is a diagram illustrating a schematic configuration of a rear projector device according to a first embodiment. FIG. The figure explaining the apparatus main body of the rear projector apparatus of 1st Embodiment in detail. The figure which shows schematic structure of the color foil used for 1st Embodiment. FIG. 2 is a diagram illustrating a schematic configuration of a color sensor used in the first embodiment. The figure explaining the apparatus main body of the rear projector apparatus which concerns on the 2nd Embodiment of this invention in detail. The figure which shows schematic structure of the multi-display system which concerns on the 3rd Embodiment of this invention. The figure which shows the spectral response characteristic of the optical sensor used for 3rd Embodiment. The figure explaining the 2nd correction target setting means used for a 3rd embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100-400 ... Rear projector apparatus 1 ... Apparatus main body, 2 ... Projection lens 3 ... Reflection mirror, 4 ... Screen 11 ... Light source, 12 ... Color foil 12a. 12b, 12d ... Transmission type color filter 12c ... Transparent filter 12c, 15 ... DMD,
16 ... DMD control unit, 17 ... color sensor 20 ... light sensor, 22 ... control unit,
221 ... luminance information conversion means, 222 ... first correction target setting means,
223 ... second correction target setting means, 224 ... correction amount generation means 23 ... communication line

Claims (9)

With a light source;
A plurality of filters having at least each color of red (R), green (G), and blue (B), transmitting light from the light source, and emitting light of each color in order;
Light modulating means for modulating the light of each color emitted from the plurality of filters with an image signal;
A screen on which the light of each color modulated by the light modulation means is projected;
A rear projector apparatus comprising: a light detection unit configured to detect the intensity of the light of each color emitted from the plurality of filters. The light detection means detects the intensity of the light of each color emitted from the plurality of filters in a state where an all white reference pattern is displayed on the screen by the light modulation means,
2. The rear according to claim 1, wherein at least one of brightness and color shift for each color displayed on the screen can be adjusted by a detection signal of the light intensity of each color detected by the light detection means. Projector device. The rear projector apparatus according to claim 2, wherein the light detection unit is detachably provided on an optical path between the light modulation unit and the screen. The plurality of filters include a white filter that transmits light from the light source and emits white (W) light, and the light detection unit transmits the white filter that emits white (W) light. Detect the intensity of light leakage,
2. The rear projector apparatus according to claim 1, wherein brightness of the screen of the screen by light of the light source can be adjusted by a detection signal detected by the light detection means. 5. The rear projector apparatus according to claim 4, wherein the light detection unit is disposed on a side of an optical path between a plurality of filters and the light modulation unit. The plurality of filters are disposed along a circumferential direction of a rotatable disc-shaped wheel, and the light detection means is configured to transmit light from the white filter to light from the light source by the rotation of the disc-shaped wheel. The rear projector apparatus according to claim 4, wherein the leakage light is detected when positioned on the optical path of the rear projector. A light source; a plurality of filters having at least each color of red (R), green (G), and blue (B), transmitting light from the light source, and emitting light of each color in order; A light modulating means for modulating the light of each color emitted from the filter with an image signal; a screen on which the light of each color modulated by the light modulating means is projected; and projected onto the screen by the light modulating means. A multi-display system comprising a plurality of rear projector devices each including a light detecting means for detecting the light intensity of each color, wherein the plurality of rear projector devices are set as a master device and a slave device, respectively.
The rear projector device set as the master device collects luminance information of each color from the detection signals of the light detection means detected by all the rear projector devices, and sets a correction target value from the collected luminance information. A multi-display system that adjusts at least one of brightness and color shift for each color on the screen screen in all rear projector apparatuses based on the correction target value. The rear projector device set as the master device sets, as the correction target value, the lowest luminance value among the luminance information for each color detected by the light detection means of all the rear projector devices. The multi-display system according to claim 7. The rear projector device set as the master device determines the color misregistration for each color of the luminance information detected by the light detection means of all the rear projector devices, and uses the largest color misregistration as the correction target value. The multi-display system according to claim 7, wherein the multi-display system is set.

Images