JP2009133911A - Rear projector apparatus and multi-display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rear projector device and a multi-display system capable of accurately adjusting a screen.
Light 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 a first optical sensor 18, and luminance information L1 based on this detection signal is detected. Thus, the luminance information L2 equivalent to that detected by the second optical sensor 19 arranged immediately before the screen 4 is obtained from the correlation equation of the expression (1), and this luminance information L2 is collected for all the rear projector devices 100 to 400. Among these, the lowest brightness value is set as the correction target value, and the projector device 100 to 400 generates a correction value of the brightness value for the correction target value, and each rear is based on the correction amount. The brightness of the screen 4 of the projector devices 100 to 400 is adjusted.
[Selection] Figure 3

Description

  The present invention relates to a rear projector device and a multi-display system that forms a single large display screen by combining a plurality of these 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. A color image is formed by reflecting the image on the screen in units of pixels using a DMD (Digital Micromirror Device). By combining a plurality of such rear projector devices, a single large-screen multi-display can be formed. The multi-display system made possible is configured.

  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 vary. When one screen is constructed, there is a problem that the whole image becomes very difficult to see.

Therefore, conventionally, in each of the plurality of rear projector apparatuses assigned to the master and the slave as disclosed in Patent Document 1, the reflected light in the off direction of the DMD is used to make the incident light from the light source not the screen side luminance. Luminance is detected by reflection on the sensor side, and this luminance information is collected in the rear projector device on the master side, and the brightness adjustment amount is calculated, and the display on the master and slave side rear projector devices is based on this adjustment amount. A method of adjusting the brightness of the screen is considered. According to this method, it is possible to automatically correct the temporal change of the lamp of the light source at regular intervals without interrupting the operation of the apparatus.
JP 2004-343581 A

  However, in such a method of Patent Document 1, luminance information is acquired by reflected light in the off direction of the DMD, which does not correspond to the light projected on the screen, and the reflected light in the off direction is Since the luminance changes depending on the image projected on the screen, it is difficult to detect accurate luminance information, and there is a problem that the luminance adjustment of the display screen in each rear projector device cannot be performed 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; 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;
First light detecting means for detecting leakage light of light emitted from the light source; and luminance equivalent to detecting light projected on the screen based on luminance information detected by the first light detecting means Arithmetic processing means for calculating information; and brightness adjustment means for adjusting the brightness of the screen screen based on the luminance information calculated by the arithmetic processing means.

  The arithmetic processing means has a correlation equation representing a relationship between the luminance information detected by the first light detecting means and the luminance information detected by the second light detecting means for detecting the light projected on the screen. Then, luminance information equivalent to the luminance information detected by the second light detection means is calculated based on the correlation equation from the luminance information detected by the first light detection means.

  The first light detection means is arranged on a side of an optical path between the plurality of filters and the light modulation means.

  The plurality of filters further have a white filter that transmits light from the light source and emits white (W) light, and the plurality of filters are arranged along a circumferential direction of a rotatable disc-shaped wheel. The first light detection means detects leakage light when the transmitted light from the white filter is positioned on the optical path of the light from the light source by the rotation of the disk-shaped wheel.

  The invention according to claim 5 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; 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; First light detection means for detecting leakage light of the emitted light; and calculating luminance information equivalent to detecting light projected on the screen based on the luminance information detected by the first light detection means A plurality of rear projector apparatuses, and a plurality of brightness adjusting means for adjusting the brightness of the screen screen based on the luminance information calculated by the arithmetic processing means. A multi-display system in which a projector device is set as a master device and a slave device, respectively, and the rear projector device set as the master device projects onto the screen calculated by the calculation processing means of all rear projector devices Brightness information equivalent to the detected light is collected, a correction target value is set from the collected brightness information, and the brightness of the screen screen is set in each of the rear projector devices based on the correction target value. It is characterized by adjusting the height.

  The rear projector device set as the master device is characterized in that the lowest luminance value among the luminance information calculated by the arithmetic processing means of all rear projector devices is set as the correction target value.

  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 according to a first embodiment of the present invention. In this case, in the multi-display system, a plurality of (four in the illustrated example) rear projector apparatuses 100 to 400 are combined to form a 2 × 2 multi-display screen. Here, the projector device 100 is set as a master device, and the other projector devices 200 to 400 are set as slave devices.

  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 at regular intervals (not necessarily at regular intervals) along the circumferential direction. Here, red (R) transmissive color filters 12a, green (G) A four-segment filter in which a transmissive color filter 12b, a white (W) transparent filter 12c (which may be a through hole), and a blue (B) transmissive color filter 12d 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. The DMD control unit 16 receives an image signal from a main device (not shown) via the control unit 17, and transmits the red (R) transmission color filter 12 a of the color foil 12 and the transmission of green (G) by the image signal. Red (R), green (G), white (W), and blue (B) introduced through the color filter 12b, the white (W) transparent filter 12c, and the blue (B) transmissive color filter 12d. The on-direction reflection at each micro-reflecting mirror of the DMD 15 is controlled with respect to each of the lights. Further, the DMD control unit 16 has a function of adjusting the brightness of the light emitted from the light source 11 by correcting the reflected light in the ON direction by, for example, the micro reflection mirror by the correction signal input from the control unit 17. ing. The controller 17 will be described later.

  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.

  A controller 17 is connected to the DMD controller 16. The control unit 17 is connected to a first photosensor 18 as a first photodetection unit and a second photosensor 19 as a second photodetection unit.

  The first optical sensor 18 is composed of a luminance sensor, and is disposed 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). Has been. In this case, the first optical sensor 18 detects leakage light of the light emitted from the light source 11, and the light introduced into the DMD 15 among the light transmitted through the color foil 12 (used for color image creation). It is placed at a position that does not block light. The spectral response characteristic of the first optical sensor 18 includes the wavelength range of light transmitted through the white (W) transparent filter 12 c of the color foil 12. Here, the color foil 12 is detected by a sensor control signal of the control unit 17. In synchronization with the white (W) transparent filter 12c, the leakage light of the white (W) light transmitted through the transparent filter 12c is detected. That is, the first light sensor 18 leaks 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. Detect light. In this case, in order to detect only the leakage light of the light transmitted through the transparent filter 12c by the first photosensor 18, for example, white (W) based on an index (marking) (not shown) set on the color foil 12 is used. ) Transparent filter 12c is acquired, and leakage light when the white (W) transparent filter 12c is positioned on the optical path of the light from the light source 11 is detected based on this positional information. . Note that the first optical sensor 18 is preferably configured to be movable and adjustable along the optical path between the color foil 12 and the DMD 15 so that the optimum leakage light can be detected.

  The second optical sensor 19 is detachably disposed 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). . The second light sensor 19 has four-channel filters of red, green, blue, and transparent filters, and red (R) introduced from the color foil 12 through these red, green, blue, and transparent filters. ), Green (G), white (W), and blue (B) light. FIG. 5 shows an example of the spectral response characteristic of the second optical sensor 19. The spectral response characteristic (sensor sensitivity) 31 of the red filter is the transmission 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 32 of light (radiant intensity), and the wavelength region of the transmitted light (radiant intensity) of the green (G) transmissive color filter 12b of the color foil 12. 34, the spectral response characteristic (sensor sensitivity) 35 of the blue filter includes the wavelength region 36 of the transmitted light (radiant intensity) of the blue (B) transmissive color filter 12c of the color foil 12, and the spectral characteristics of the transparent filter The response characteristic (sensor sensitivity) 37 is a wavelength of transmitted light (radiant intensity) of each of the red (R), green (G), and blue (B) transmissive color filters 12a, 12b, and 12c of the color foil 12. 32, 34, 36 is intended to include all. In this embodiment, the detection signal detected by the channel of the transparent filter of the second photosensor 19 is adopted as the output of the second photosensor 19.

  Further, as shown in FIG. 6, the second optical sensor 19 is provided at the tip of the arm 21 connected to the rotating shaft 20a of the micromotor 20 as the driving source, and is always at the position of the broken line in the figure, and passes through the color foil 12. When detecting red (R), green (G), white (W), and blue (B) light introduced as described above, the light is moved to the position indicated by the solid line in FIG. It is located on the optical path between the reflection mirror 3 and the projection lens 2. In this case, in a state where the second optical sensor 19 is positioned on the front surface of the projection lens 2, the arm 21 is fixed by a fixing mechanism (not shown) so that the second optical sensor 19 does not move.

  The control unit 17 starts capturing image signals from a main device (not shown), and includes the first and second photosensors 18 and 19, the color foil 12, the DMD control unit 16, and the micromotor 20. And includes a luminance information conversion unit 171, an arithmetic processing unit 172, a correction target setting unit 173, and a correction amount generation unit 174. The luminance information conversion means 171 converts the detection signals detected by the first and second optical sensors 18 and 19 into light intensity, that is, luminance information L1 and L2. The arithmetic processing means 172 includes a correlation equation (the following equation (1)) representing the relationship between the luminance information L1 and L2 by the first and second photosensors 18 and 19, and the first and second obtained in advance. Each piece of luminance information (details will be described later) relating to the optical sensors 18 and 19 is stored, and the luminance information L2 from the second optical sensor 19 is calculated from the luminance information L1 from the first optical sensor 18 using the correlation equation. .

  The correlation equation here is obtained as follows. For example, when different lamps A and B are prepared as the lamp 11a of the light source 11, and the detection values of the first optical sensor 18 when the screen screen illuminance is changed for these lamps A and B are obtained, FIG. ) Results are obtained. Similarly, when the detection values of the second optical sensor 19 when the screen screen illuminance is changed for the lamps A and B are obtained, the result shown in FIG. 7B is obtained. In this case, the detection values for the lamps A and B by the first and second photosensors 18 and 19 have linearity as shown in FIGS. 7 (a) and 7 (b). As a result, based on these linear detection values, the value detected by the first optical sensor 18 (luminance information L1) and the value detected by the second optical sensor 19 (luminance) as shown in equation (1). A correlation equation representing the relationship of information L2) can be obtained.

L2 = L02 − ((Lh2−L12) / (Lh1−L11)) × (L01−L1)
... (1)
Here, L01 is, for example, luminance information (initial value information) by the first photosensor 18 at the time of trial operation after purchase of the device or immediately after replacement of the lamp 11a. Similarly, L02 is luminance information by the second photosensor 19. (Initial value information), Lh1 is the luminance information by the first photosensor 18 when the lamp 11a is turned on with high power (when the screen screen illuminance is increased), Ll1 is when the lamp 11a is turned on with low power Luminance information by the first optical sensor 18 (when the screen screen illuminance is lowered), similarly, Lh2 is luminance information by the second optical sensor 19 when the lamp 11a is turned on with large power, and Ll2 is small This is luminance information by the second photosensor 19 when the lamp 11a is turned on with electric power.

  The correction target setting means 173 is used when the master device (here, the projector device 100) is set. The brightness information L2 of the master device itself and another projector device (here, the projector) set as the slave device. Among the luminance information L2 collected from the devices 200 to 400), the lowest luminance value is set as the correction target value. The correction amount generation unit 174 generates a correction amount of the luminance value related to the own device based on the correction target value set by 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 22 between the control units 17 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, for each rear projector device 100-400, during the test run after purchase of the device or immediately after replacement of the lamp 11a, the luminance information of the correlation equation shown in equation (1) is detected under the above-described conditions. And stored in the arithmetic processing means 172. In this case, the arm 21 is rotated by driving the micromotor 20, and the second optical sensor 19 is positioned on the solid line position shown in FIG. 6, that is, on the optical path between the projection lens 2 and the reflecting mirror 3, and in this state The first and second photosensors 18, 19 start the initial value information 101, L02, the luminance information Lh1, Lh2 when the lamp 11a is turned on with high power, and the luminance information when the lamp 11a is turned on with low power. Ll1 and Ll2 are obtained respectively.

  A normal use of displaying a color image on the screen 4 from this state will be described.

  In this case, the optical sensor 19 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 from the control unit 17 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 of the screen displayed on the screen 4 is adjusted will be described.

  In this case, the brightness of the screen screen is adjusted every predetermined time during the operation of the apparatus. First, in a state where a color image is displayed on the screen 4, the brightness of the lamp 11 a is detected by the first light sensor 18. In this case, the first optical sensor 18 can detect a position that does not block light (light used for color image creation) introduced into the DMD 15 among the light transmitted through the color foil 12, that is, leak light. The white (W) light leakage light transmitted through the transparent filter 12c is detected in synchronization with the white (W) transparent filter 12c of the color foil 12. The detection signal of the first optical sensor 18 is converted into luminance information L1 by the luminance information converting unit 171 of the control unit 17 and input to the arithmetic processing unit 172. In the arithmetic processing means 172, the luminance information L1 by the second photosensor 19 is detected by substituting the luminance information L1 into the correlation equation of the formula (1), that is, the second photosensor 19 arranged on the front surface of the screen 4 detects it. Equivalent luminance information L2 is calculated.

  The operation so far is performed simultaneously for all the rear projector apparatuses 100 to 400. Then, the luminance information L2 calculated by the arithmetic processing unit 172 is collected from the slave device (projector devices 200 to 400) to the control unit 17 of the master device (projector device 100) via the communication line 22. In the projector device 100, the lowest luminance value from the luminance information L <b> 2 collected by the correction target setting unit 173 is set as the correction target value. The correction target value is sent back to each control unit 17 of the slave device (projector devices 200 to 400) via the communication line 22 including the control unit 17 of the projector device 100. Thereby, the correction amount generation means 174 of each control unit 17 of the projector devices 100 to 400 compares the correction target value from the master device (projector device 100) with the luminance information L2 calculated by each projector device 200 to 400. Thus, a correction value for the luminance value is generated.

  The amount of correction of the brightness value differs for each projector device 100-400. These correction amounts are input to the DMD control unit 16 as correction signals. 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 brightness of the light emitted from the light source 11 is adjusted. The brightness on the screen 4 of all the rear projector apparatuses 100 to 400 is adjusted to be the same.

  Therefore, in this way, the leakage light of the 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 first photosensor 18, and the detection signal is Based on the luminance information L1 based thereon, luminance information L2 equivalent to that detected by the second optical sensor 19 arranged immediately before the screen 4 is obtained from the correlation equation of equation (1), and this luminance information L2 is obtained from the rear projector device 100. All 400 are collected, and the lowest brightness value among them is set as a correction target value, and a correction value for the brightness value is generated in each projector apparatus 100 to 400 for this correction target value. Based on this, the brightness of the screen 4 of each rear projector apparatus 100 to 400 is adjusted. As a result, even if a situation occurs in which the brightness of the screen on the screen 4 formed by the rear projector apparatuses 100 to 400 does not match due to individual differences of the lamps 11a used for the light source 11 or deterioration with time, etc. Can be resolved quickly, and the brightness of the screens of the rear projector apparatuses 100 to 400 can be matched. Also, the luminance information L2 used for brightness adjustment is equivalent to that acquired at a position close to the screen 4 on which the image is projected, and high-accuracy information in accordance with the image projected on the screen 4 is obtained. Therefore, it is possible to perform screen adjustment in each of the rear projector apparatuses 100 to 400, that is, adjustment with high accuracy without causing variations in the brightness of the screen screen of each of the rear projector apparatuses 100 to 400. Further, the first optical sensor 18 is light that is introduced into the DMD 15 among the light that passes through the color foil 12 on the side of the optical path between the color foil 12 and the DMD 15 (light used for color image creation). Since the luminance information L1 can be acquired without affecting the image displayed on the screen 4 in any way, it is possible to obtain the predetermined information while using the apparatus. The brightness on the screen screen of the rear projector apparatuses 100 to 400 can be adjusted with the passage of time, and a high-quality screen can always be displayed on the screen 4.

  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. In the above-described embodiment, a color sensor having four channel filters of red, green, blue, and transparent filters is used as the second photosensor 19. However, a luminance sensor similar to the first photosensor 18 is used. Can also be used.

  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.

1 is a diagram showing a schematic configuration of a multi-display system according to a first embodiment of the present invention. The figure which shows schematic structure of the rear projector apparatus used for 1st Embodiment. The figure explaining the apparatus main body of the rear projector apparatus used for 1st Embodiment in detail. The figure which shows schematic structure of the color foil used for 1st Embodiment. The figure which shows the example of a spectral response characteristic of the 2nd optical sensor used for 1st Embodiment. The figure which shows schematic structure of the 2nd optical sensor used for 1st Embodiment. The figure for demonstrating the correlation type memorize | stored in the arithmetic processing means used for 1st 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 ... control unit 171 ..., 172 ..., 173 ..., 174 ...
18 ... 1st optical sensor 19 ... 2nd optical sensor

Claims (6)

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;
First light detection means for detecting leakage light of light emitted from the light source;
Arithmetic processing means for calculating luminance information equivalent to detecting light projected on the screen based on luminance information detected by the first light detection means;
Brightness adjustment means for adjusting the brightness of the screen screen based on the luminance information calculated by the calculation processing means;
A rear projector device comprising: The arithmetic processing means calculates a correlation equation representing a relationship between the luminance information detected by the first light detecting means and the luminance information detected by the second light detecting means for detecting the light projected on the screen. And calculating luminance information equivalent to the luminance information detected by the second light detection means based on the correlation equation from the luminance information detected by the first light detection means. Item 4. The rear projector device according to Item 1. The rear projector apparatus according to claim 1, wherein the first light detection unit is disposed on a side of an optical path between the plurality of filters and the light modulation unit. The plurality of filters further include a white filter that transmits light from the light source and emits white (W) light, and the plurality of filters are arranged along a circumferential direction of a rotatable disc-shaped wheel. The first light detection means is arranged to detect the leakage light when the transmitted light from the white filter is positioned on the optical path of the light from the light source by the rotation of the disk-shaped wheel. The rear projector apparatus according to claim 3. 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 unit that modulates 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 unit is projected; and leakage light of the light emitted from the light source is detected. First light detection means for performing calculation processing means for calculating luminance information equivalent to detecting light projected on the screen based on the luminance information detected by the first light detection means; And a plurality of rear projector apparatuses comprising: brightness adjusting means for adjusting the brightness of the screen screen on the basis of the luminance information calculated by the processing means. It is a multi-display system set for each of the star device and slave device,
The rear projector device set as the master device collects luminance information equivalent to detecting the light projected on the screen calculated by the arithmetic processing means of all rear projector devices, and collects these information. A multi-display system, wherein a correction target value is set based on the luminance information and the brightness of the screen screen is adjusted in each of the rear projector devices 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 calculated by the arithmetic processing means of all the rear projector devices. The multi-display system according to claim 5.

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