JP2004205798A - Method and device for adjusting image of color image display apparatus, and color image display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color image display apparatus in which the hue of a displayed image is varied even when a color wheel of a simple structure is used. <P>SOLUTION: The brightness of an image projected on a screen is enhanced and the color balance is varied by using a period T1 in which an image signal corresponding to the displayed image is suspended for preventing a color mixture and adjusting the angle (borders of respective filters) of the color wheel 2 in the suspended period T1 or the borders of the respective filters and the timing at which the image signal corresponding to the displayed image is outputted. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention switches color separation filters having different spectral characteristics (spectral transmission characteristics or spectral reflection characteristics), for example, filters respectively transmitting red (R), green (G), and blue (B) light, in an optical path. Image adjusting method of color image display device for separating white light in a time-division manner and displaying an image using light of each color obtained by such time-division color separation, image adjustment device of a color image display device, and color The present invention relates to an image display device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a color image display device provided with a time-division color separation device using a color wheel, for example, there is a digital image display system as described in Japanese Patent Application Laid-Open No. 9-163391. FIG. 8 shows a schematic configuration thereof.
[0003]
The digital image display system shown in FIG. 8 irradiates a light beam from a light source 116 to an SLM (spatial light modulator) 114 via lenses 117a and 117b and an integrator 117c in order, and reflects light from the SLM 114 on a screen. An image is displayed. Between the lenses 117a and 117b, a color wheel 115 in which R, G, and B transmission filters are evenly arranged in the circumferential direction is inserted into the optical path, and at the time of insertion, the color wheel 115 is moved by the lens 117a. A spot of a predetermined size is formed on the filter surface.
[0004]
The color wheel 115 has a wheel center supported on one end of a rotating shaft 115b of a motor 115a, and is rotated in a predetermined direction by the motor 115a. The entire color wheel assembly including the color wheel 115, the motor 115a and the rotating shaft 115b moves in a direction perpendicular to the optical path.
[0005]
The SLM 14 is, for example, a digital macro mirror device (DMD) including hundreds of thousands of micro mirrors each of which can control the tilt angle. In this DMD, each micromirror corresponds to each pixel of the display image on the screen, and an arbitrary image can be displayed by controlling the tilt angle of each micromirror. Specifically, for a certain micromirror, angle control is performed so that the reflected light deviates from the screen, and for a certain micromirror, the angle control is performed so that the reflected light is guided to a corresponding pixel position on the screen. To obtain a desired image.
[0006]
Angle control of each micromirror of the DMD is selectively performed based on image data stored in the display memory 113. In the display memory 113, the processor 112 performs various processes (for example, conversion to RGB data, processing for repairing an interlaced field, etc.) on a signal supplied from the outside via the interface 111. The generated image data is stored. Here, the external input signal includes a video reproduction signal (moving image) from a video device, an RGB reproduction signal from a personal computer (PC), and the like.
[0007]
The driving of the motor 115a, the movement of the color wheel assembly, and the tilt angle control of the SLM 114 are synchronized based on a timing signal from the timing unit 118.
[0008]
In the digital image display system configured as described above, the rotation of the color wheel 115 causes the R, G, and B transmission filters to be sequentially switched in the optical path, whereby white light from the light source 116 is converted to R, G, Each color of B is color-separated in a time-division manner. The light beam color-separated by this time division enters the integrator 117c via the lens 117b. In the integrator 117c, the distribution of the luminance of the incident light beam on a plane perpendicular to the optical axis is made uniform.
[0009]
The light beam that has been color-separated in a time-sharing manner and has uniform luminance is applied to the SLM 114. The SLM 114 irradiates the light in the order of R light, G light, and B light, reads image data corresponding to each color from the display memory 113 according to each irradiation timing, and controls the tilt angle of each micro mirror. As a result, the reflected light from the SLM 114 is time-divided into R image light, G image light, and B image light (these constitute one image frame), and these R, G, and B image lights are The images are sequentially enlarged and projected on the screen.
[0010]
On the screen, the R, G, and B image lights from the SLM 114 are sequentially enlarged and projected, and displayed to the human eye due to the afterimage phenomenon, with each color displayed by the R, G, and B image lights. Are combined and recognized as a color image.
[0011]
FIG. 9 is a diagram illustrating an example of the color wheel 115. The R transmission filter 101 transmits red (R) light, the G transmission filter 102 transmits green (G) light, and the blue (B) light. Four filters, a B transmission filter 103 that transmits light and a W transmission filter 104 that transmits white light as it is, are arranged uniformly in the wheel circumferential direction. The ratio of the size of each filter in the circumferential direction (or the ratio of the angle at which each filter is divided) is the same.
[0012]
In such a color image display device, Japanese Patent Application Laid-Open No. H11-163873 discloses a technology that enables a color ratio of a color wheel to be adjusted by using a color wheel having a plurality of color rings having different color ratios, and a color tone of a display image to be changed. Has been described. FIG. 10 shows a schematic diagram of the color wheel.
[0013]
The color wheel illustrated in FIG. 10 includes a color ring (outer peripheral wheel) 121 in which three filters of transmission filters R1, G1, and B1 are arranged at a predetermined ratio in the circumferential direction, and three transmission filters R2, G2, and B2. The filter comprises a color ring (inner circumferential wheel) 120 in which filters are sequentially arranged in the circumferential direction. The color rings 120 and 121 have the same wheel center position but different color ratios. In this example, the color ring 121 has a larger ratio of the B transmission filter than the color ring 120.
[0014]
In the case of the above color wheel, the first state in which the color ring 120 is inserted into the optical path of white light from the light source and the wheel is rotated to perform color separation in a time-division manner, and the color ring 121 is inserted in the optical path. To switch to the second state in which color separation is performed in a time-sharing manner by rotating the wheel. The display image obtained in the second state is an image having a stronger blue component than the display image obtained in the first state.
[0015]
Further, Patent Document 1 discloses a structure in which a color wheel is movable, and a relative positional relationship between white light and coloring is changed, thereby changing a ratio of white light transmitted through a color filter, thereby obtaining a luminance of a display image. There is also described a technique for changing
[0016]
[Patent Document 1]
JP-A-9-163391
[0017]
[Problems to be solved by the invention]
However, in the case of using a color wheel having a plurality of color rings having different color ratios as described above, although the color ratio of the color wheel can be switched or adjusted, since a plurality of color rings having different color ratios are used, There was a problem that the configuration became complicated.
[0018]
Also, by changing the relative positional relationship between the white light and the coloring, the ratio of the white light transmitted through the color filter is changed, and when changing the luminance of the display image, the color wheel having the coloring is moved. Is required, and the configuration becomes complicated.
[0019]
An object of the present invention is to provide a color image display device that can change the color of a display image with a simple configuration.
[0020]
[Means for Solving the Problems]
In order to achieve the above object, the image adjusting method of the color image display device according to the present invention is configured such that a plurality of filters having different spectral characteristics are time-divided into white light from the light source by coloring arranged at a predetermined ratio in a circumferential direction. The color separation is performed, and the image light of the different color component is sequentially generated by sequentially irradiating the light of the different color component generated by the plurality of filters to the modulation unit, and the image light of the different color component sequentially generated is generated. An image adjustment method for a color image display device for projecting and displaying on a screen, wherein the modulating means projects and displays on the screen during a first period including a period in which a boundary between the plurality of filters is irradiated with the white light. Adjusting the color balance and / or the brightness of the selected image, wherein the boundary between the plurality of filters is irradiated with the white light. And changes the color balance and / or brightness of the projected image displayed on the screen by adjusting the start timing of the first period and.
[0021]
According to the above invention, the color balance and / or the brightness of the image projected and displayed on the screen is changed by adjusting the timing at which the boundaries of the plurality of filters are irradiated with white light and the start timing of the first period. Therefore, even if a color wheel having a fixed color ratio is used alone, the hue of the display image can be changed, and the hue of the display image can be changed with a simple configuration.
[0022]
Further, the image adjustment device of the color image display device of the present invention is a color filter in which a plurality of filters having different spectral characteristics are arranged at a predetermined ratio in a circumferential direction to color-separate white light from a light source in a time-division manner, By sequentially irradiating the light of the different color components generated by the plurality of filters to the modulating means, the image light of the different color components is sequentially generated, and the sequentially generated image light of the different color components is projected and displayed on a screen. An image adjustment device for a color image display device, wherein the modulation unit is configured to control a color of an image projected and displayed on the screen during a first period including a period in which boundaries between the plurality of filters are irradiated with the white light. An adjustment state for changing balance and / or luminance, a timing at which boundaries between the plurality of filters are irradiated with the white light, and the first period By adjusting the start timing and changes the color balance and / or brightness of the projected image displayed on the screen.
[0023]
According to the above invention, the color balance and / or the brightness of the image projected and displayed on the screen is changed by adjusting the timing at which the boundaries of the plurality of filters are irradiated with white light and the start timing of the first period. Therefore, even when a color wheel having a simple configuration is used, it is possible to change the color of the displayed image.
[0024]
A color image display device according to the present invention includes a light source that outputs white light, a color wheel including a color ring in which a plurality of filters having different spectral characteristics are arranged at a predetermined ratio in a circumferential direction, and the color wheel includes the white light. A color wheel moving means for moving in a direction crossing the optical path, and a signal output means for intermittently sequentially outputting video signals corresponding to the lights of the different color components at desired intervals corresponding to boundaries of the plurality of filters. With the input of the video signal, a pixel state corresponding to the video signal is formed, and light of different color components that are color-separated by the coloring is sequentially irradiated to sequentially generate image light of the different color components. Modulating means; and projecting means for enlarging and projecting the image light of the different color components generated by the modulating means onto a screen. An output unit configured to adjust a color balance and / or a brightness of an image projected and displayed on the screen during a first period including a period in which a boundary between the plurality of filters is irradiated with the white light; A first period from when a desired interval is started to when the boundary reaches the center of the white light radiated on the color ring, and a center of the white light where the boundary is radiated on the color ring; And a second period from when the predetermined interval is reached to when the desired interval ends is different.
[0025]
According to the above invention, the first period from the start of the desired interval until the boundary reaches the center of the white light irradiated on the coloring, and the boundary is on the coloring. Since the second period from reaching the center of the irradiated white light to the end of the desired interval is different, even when a color wheel having a simple configuration is used, a color wheel having a fixed color ratio is used. Since the color tone of the display image can be adjusted even when used alone, the color tone of the display image can be changed with a simple configuration.
[0026]
Further, the color image display device of the present invention is a color image display device that includes a light source that outputs white light and a color ring in which a plurality of filters having different spectral characteristics are arranged in a circumferential direction at a predetermined ratio shifted from the reference ratio by a predetermined amount. A wheel; a color wheel moving means for moving the color wheel in a direction crossing the optical path of the white light; and a boundary between the plurality of filters at a timing according to the reference ratio, the image signal corresponding to the light of the different color component. And signal output means for intermittently outputting the signals intermittently at desired intervals, and different color components which form a pixel state corresponding to the video signal with the input of the video signal and are color-separated by the coloring. And a modulating unit that sequentially irradiates the light of the different colors to sequentially generate image light of the different color components; and the different unit generated by the modulating unit. Projecting means for enlarging and projecting the image light of the component onto a screen, wherein the signal output means projects the image light onto the screen during a first period including a period in which a boundary between the plurality of filters is irradiated with the white light. An adjustment state for changing a color balance and / or a luminance of a displayed image, wherein a luminance or a color balance of the image projected on the screen is adjusted based on a difference between the predetermined ratio and the reference ratio. I do.
[0027]
According to the above invention, since the brightness or color balance of the image projected on the screen is adjusted based on the difference between the predetermined ratio and the reference ratio, even when a color wheel having a simple configuration is used, the color ratio However, since the color tone of the display image can be adjusted even when the fixed color wheel is used alone, the color tone of the display image can be changed with a simple configuration.
[0028]
In addition, the color image display device of the present invention is a light source that outputs white light, a color wheel including a color ring in which a plurality of filters having different spectral characteristics are arranged at a predetermined ratio in a circumferential direction, and the color wheel. A color wheel moving means for moving in a direction crossing the optical path of white light, and a signal for intermittently sequentially outputting video signals corresponding to the lights of the different color components at desired intervals corresponding to boundaries of the plurality of filters. Output means and, with the input of the video signal, forming a pixel state corresponding to the video signal and sequentially irradiating light of different color components color-separated by the coloring to sequentially emit image light of the different color components. Modulation means to be generated, including projection means to enlarge and project the image light of the different color component generated by the modulation means on a screen, Characterized in that it comprises an adjusting unit for adjusting the color balance and / or brightness of the projected image displayed on the screen by adjusting the timing of outputting the video signal in the serial signal output means.
[0029]
According to the invention described above, the color ratio is fixed because the adjustment unit adjusts the color balance and / or the brightness of the image projected and displayed on the screen by adjusting the timing of outputting the video signal in the signal output unit. The color tone of the display image can be adjusted by using the color wheel alone, so that the color tone of the display image can be changed with a simple configuration.
[0030]
Further, in the color image display device of the present invention, the signal output unit forms a first state in which the video signal is not output to the modulation unit during the desired interval, and forms a uniform image for the modulation unit. A second state in which a uniform image signal to be output is output, and further comprising switching means for switching between the first state and the second state.
[0031]
According to the above-described invention, the above-described effects can be obtained, and images having different color characteristics can be obtained in the first state and the second state. Therefore, the color wheel having a fixed color ratio is used alone. However, it is possible to obtain images having two different color characteristics.
[0032]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
[0033]
FIG. 1 is a block diagram illustrating a schematic configuration of a color image display device according to an embodiment of the present invention.
[0034]
The color image display device of the present embodiment is a single-panel full-color projector using a color wheel, and uses a period in which a video signal corresponding to a display image is stopped in order to avoid color mixing. The brightness of the image projected on the screen can be improved or the color balance can be changed by adjusting the angle of the filter or the boundary of each filter and the timing of outputting the video signal corresponding to the display image. .
[0035]
Specifically, the color image display device according to the present embodiment includes a light source 1 serving as a light source unit that collects white light and outputs the light in a predetermined direction, as shown in FIG. A color wheel 2 that separates the divided white light into a plurality of monochromatic lights (in this example, red (R), green (G), blue (B), and white (W)) in a time-division manner; The light valve 3 controls the direction of the separated light, the reflector 4 reflects the light output from the light valve 3, and the DMD shown in FIG. 8 is illuminated with the light reflected by the reflector 4. The reflection device 5 such as a specular reflection type light modulator and the monochromatic light applied to the reflection device 5 are synchronized with a video signal corresponding to the applied monochromatic light, so that red (R), green (G), blue The video signal corresponding to (B) is sequentially supplied to the reflection device 5 and A drive circuit 6 for turning on / off each pixel to form a pixel state corresponding to a video signal in the reflection device 5, and light generated by modulating light irradiated in accordance with the pixel state formed by the reflection device 5. A projection lens 7 for enlarging and projecting image light onto a screen 8, and a pixel included in the reflection device 5 during a period in which video signals corresponding to red (R), green (G), and blue (B) are not supplied to the reflection device 5. A setting unit 9 for setting whether to be all on (a state where incident light is reflected on the screen 8) or all off (a state where incident light is not reflected on the screen 8), and a white color output from the light source 1 A color wheel driving unit 10 or the like as color wheel moving means for moving the color wheel 2 at a predetermined speed in a direction crossing the optical path of light is provided.
[0036]
The driving circuit 6 includes the interface 111, the processor 112, and the display memory 113 illustrated in FIG. 8, and the color wheel driving unit 10 includes the motor 115 illustrated in FIG. 8, and includes the driving circuit 6 and the color wheel driving unit. The operation of 10 is synchronized by the timing unit (not shown) shown in FIG.
[0037]
As shown in FIGS. 1 and 2, the color wheel 2 includes a transmission filter 2R that transmits red (R) light, a transmission filter 2G that transmits green (G) light, and a transmission filter 2B that transmits blue (B) light. In addition, the four filters of the transmission filter 2W that transmits the white light as it is are a predetermined ratio in the circumferential direction (a ratio of the size in the circumferential direction, or a ratio of the angle at which each filter is divided, and hereinafter simply referred to as a ratio). ). In this example, the ratio (R: G: W: B) of each filter shown in FIG. 2 is used as a reference ratio. In FIG. 2, reference numeral 21 denotes a boundary between the filters. Note that R, B, W, and G are positive numbers.
[0038]
FIG. 3 shows how the color wheel 2 rotates and crosses the optical path of the condensed white light output from the light source 1. In particular, the boundaries between the filters provided on the color wheel 2 cross the optical path of the white light. FIG. In FIG. 1, reference numeral 1a denotes an image (hereinafter, referred to as a beam) when the condensed white light output from the light source 1 is irradiated on the color wheel 2, and reference numeral 21 denotes a boundary between the filter 2R and the filter 2G. 1 and 2 have the same reference numerals.
[0039]
FIG. 3A shows the state at the time when the boundary 21 reaches the beam 1a by the movement of the color wheel 2 in the direction of arrow A. FIG. 3B shows the state when the color wheel 2 moves in the direction of arrow A. FIG. 3C shows a state at the time when the boundary 21 reaches the center position of the beam 1a, and FIG. 3C shows a state at the time when the boundary 21 finishes passing through the beam 1a due to the movement of the color wheel 2 in the direction of the arrow A. ing. Note that FIG. 3 shows only the positional relationship between the boundary between the filters 2R and 2G and the beam 1a, but this relationship is not limited to the positional relationship between the boundary between the filters 2R and 2G and the beam 1a. The same applies to the positional relationship between the boundary and the beam 1a.
[0040]
As shown in FIGS. 3A to 3C, when the boundary between the filters is irradiated with the beam 1 a, that is, two filters having different colors simultaneously pass the optical path of the white light from the light source 1. When there is a high possibility of crossing, if the reflection device 5 forms a pixel state corresponding to the color of any of the filters, a problem arises that color mixing occurs. Therefore, in a period in which there is a high possibility that two filters having different colors cross the optical path of the white light from the light source 1 at the same time, a pixel state corresponding to one of the single colors is formed in order to avoid color mixing. It is conceivable to stop supplying the video signal for performing the operation to the reflection device 5. In FIG. 3, the period T1 during which the monochrome video signal is stopped is shown with reference to the positions (T1a, T1b) where the center position of the beam 1a exists on the color wheel 2. Supplementing this point, when the center position of the beam 1a reaches the position T1a, the drive circuit 6 stops supplying a video signal for displaying an image corresponding to red (R) to the reflection device 5, and stops driving the beam. When the center position of 1a reaches the position T1b, the drive circuit 6 starts supplying a video signal to the reflection device 5 for forming a pixel state corresponding to green (G).
[0041]
The relationship between the period T1 and the boundary 21 is such that when the beam 1a is circular, the center position T1c of the period T1 matches the boundary 21. However, in order to increase the brightness of the image projected on the screen 8, it is also possible to turn on all the pixels of the reflection device 5 only during the period T <b> 1 and reflect the irradiation light to the screen 8.
[0042]
The position T1a, T1b may be detected by the timing unit shown in FIG. 8, or a detection unit for detecting the rotational position of the color wheel 2, for example, may be provided. The positions T1a and T1b may be detected based on this, or may be changed as appropriate.
[0043]
In this example, as shown in FIG. 4, according to the purpose, a physical boundary of each filter of the color wheel 2 and a signal output by the drive circuit 6, for example, an image for forming a pixel state corresponding to a single color. By adjusting the timing of outputting a signal or a signal for turning on or off all the pixels of the reflection device 5, the brightness of the image projected on the screen 8 is improved, or the color balance is changed. .
[0044]
For example, the filters 2R, 2G, 2B, and 2W are provided at a predetermined ratio of R: G: B: W, and the period T1 is set as described above corresponding to each boundary 21 of these filters. In this case, the ratio of the filters 2R, 2G, 2B and 2W is changed from the reference ratio shown in FIG. 2 as shown in FIG. 6 without changing the timing at which the period T1 occurs. When all the pixels are turned on, it is possible to improve the brightness of the image projected on the screen 8 and change the color balance. In FIG. 6, a and b are the changes in the ratio of the filter, the ratio of the filter 2R is R + 2a, the ratio of the filter 2G is G-ab, the ratio of the filter 2W is W + 2b, and the ratio of the filter 2B is B-B. This is an example of ab. The changes a and b satisfy a <(1/2) T1 and b <(1/2) T1. This condition is a condition for preventing the boundary 21 between the filters from entering the beam 1a during the period T1 by adding the variations a and b. Therefore, by adjusting the amounts of change a and b within the range satisfying this condition, it is possible to improve the brightness of the image projected on the screen 8 and change the color balance, and at least during the period T1. In addition, the boundary 21 between the filters enters the beam 1a, and the influence of color mixing can be reduced as compared with the case where the above condition is not satisfied.
[0045]
FIG. 4 shows the above description corresponding to each boundary 21 of the filters 2R, 2G, 2B and 2W when the filters 2R, 2G, 2B and 2W are provided at a predetermined ratio of R: G: B: W (reference ratio). FIG. 10 is a diagram showing a specific example in a case where the ratio of the filters 2R, 2G, 2B, and 2W is changed without changing the timing at which the period T1 occurs when the period T1 is set as described above. In FIG. 4, the same contents as those shown in FIG. 3 are denoted by the same reference numerals.
[0046]
FIG. 4A shows an example in which the above-mentioned variation a is set to 0. In this case, the relationship between the period T1 and the boundary 21 is the same as that in FIG.
[0047]
FIGS. 4B and 4E show an example in which the change a is set to a positive value. The positions T1a and T1b that determine the period T1 are different from those in FIG. Side. Therefore, in the case of FIG. 4B and FIG. 4E, if the setting is made such that all the pixels of the reflection device 5 are turned on during the period T1, the area of the filter 2R through which the beam 1a passes is limited. 4A, the area becomes larger by 2a corresponding to the variation a, and the area of the filters 2G and 2B through which the beam 1a passes decreases by the variation a, respectively, as compared with the case of FIG. Therefore, the amount of the beam 1a passing through the filter 2R increases during the period T1 in FIGS. 4B and 4E. Therefore, the red color of the image projected on the screen 8 becomes stronger. That is, when the variation a is a positive value, the red color of the image projected on the screen 8 becomes stronger.
[0048]
FIGS. 4C and 4D show an example in which the change b is set to a positive value. The positions T1a and T1b that determine the period T1 are different from those in FIG. Side. Therefore, in the case of FIG. 4C and FIG. 4D, when the setting is made such that all the pixels of the reflection device 5 are turned on during the period T1, the screen becomes smaller than when the change b is 0 or less. The brightness of the image projected on the image 8 becomes higher.
[0049]
Therefore, when the color wheel 2 of FIG. 6 in which the variations a and b are set so as to be as shown in FIGS. 4B to 4E is used, when the color wheel 2 shown in FIG. In comparison, an image in which red is strong and luminance is high can be projected on the screen 8.
[0050]
As shown in FIG. 7, by using the color wheel 2 in which only the variation b is a positive value and the ratio of each filter is adjusted, the red of the image projected on the screen 8 is increased, and the luminance is increased. You may do so. The method of changing the ratio of each filter is not limited to the method shown in FIG. 6. For example, the ratio may be changed at all the boundaries between the filters, or only at two or one boundary between the filters. The ratio may be changed.
[0051]
In order to enhance the green or blue color of the image projected on the screen 8 when the filter ratio is adjusted as shown in FIG. 6, the relationship between the changes a and b may be set as appropriate.
[0052]
In the above example, when the setting unit 9 is set to turn on all the pixels of the reflection device 5 during the period T1, the color balance and the brightness of the image projected on the screen 8 can be adjusted. In the case where the setting unit 9 is set to turn off all the pixels of the reflection device 5 during the period T1, the image light projected on the screen 8 during the period T1 becomes very small. The operation of adjusting the color balance and the luminance in the period T1 is not performed. Therefore, the setting unit 9 has two color characteristics depending on whether the setting is such that all the pixels of the reflection device 5 are turned on or all the pixels are turned off during the period T1.
[0053]
As described above, the physical boundaries between the filters of the color wheel 2 and the signals output by the driving circuit 6, for example, the video signal for forming a pixel state corresponding to a single color or all the pixels of the reflection device 5 are turned on or all turned on. By adjusting the timing of outputting a signal or the like for turning off the color balance, the color balance of the image projected on the screen 8 can be reduced without using a plurality of color rings having different color ratios as described in the related art. And brightness can be adjusted. Therefore, the configuration can be simplified. A plurality of pixels having different color ratios as described in the related art depends on whether the setting unit 9 is set to turn on all the pixels of the reflective device 5 during the period T1 or set to turn off all of the pixels. , It is possible to have two color characteristics without using the coloring.
[0054]
In the above example, the timing of the period T1 corresponding to the reference ratio, that is, a signal output by the drive circuit 6, for example, a video signal for forming a pixel state corresponding to a single color or all the pixels of the reflection device 5 are turned on or all are turned off. The color balance and the brightness of the image projected on the screen 8 are adjusted by changing the ratio of each filter included in the color wheel 2 without changing the timing of outputting a signal or the like. Without changing the ratio of each filter, the timing of the period T1 corresponding to the reference ratio, that is, the signal output by the drive circuit 6, for example, the video signal for forming a pixel state corresponding to a single color, and all the pixels of the reflection device 5 are turned on. Alternatively, it is projected on the screen 8 by changing the timing of outputting a signal or the like for turning everything off. It may be adjusted the color balance and brightness of the image. The schematic configuration of this example is the same as that shown in FIG. However, in this adjustment example, as shown in FIG. 2, a color wheel in which the ratio of each filter is a reference ratio is used as the color wheel 2, and all the pixels of the reflection device 5 are turned off during the period T1. And
[0055]
FIG. 5 shows that filters 2R, 2G, 2B and 2W are provided at a predetermined ratio of R: G: B: W (reference ratio), and the period corresponding to each boundary 21 of these filters as described above. FIG. 13 is a diagram illustrating a specific example in a case where the timing at which the period T1 occurs is changed without changing the ratio of the filters 2R, 2G, 2B, and 2W when T1 is set. In FIG. 5, the same reference numerals are given to the same contents as those shown in FIGS. The adjustment of the timing at which the period T1 occurs is adjusted by the setting unit (adjustment unit) 9.
[0056]
FIG. 5A shows an example in which the change in the occurrence timing of the period T1 is set to 0. In this case, the relationship between the period T1 and the boundary 21 is the same as in FIG. 3 and FIG. FIG. 5B shows the output timing and stop timing of the signal output by the drive circuit 6 such that the center position T1c of the period T1 is shifted toward the filter 2G by the shift amount c as compared with FIG. 5A. This is an example in which is shifted. In this case, focusing on the period excluding the period T1, during the period excluding the period T1, the period in which the filter 2R crosses the beam 1a is longer than that in FIG. 5A, and the period in which the filter 2G crosses the beam 1a is longer. Since it is shorter than that in FIG. 5A, red becomes stronger and green becomes weaker. Similarly, in the case of FIG. 5C, green becomes stronger and the brightness becomes lower, in the case of FIG. 5D, blue becomes stronger and the brightness becomes lower, and in FIG. Becomes weaker. Therefore, when the output timing and the stop timing of the signal output from the drive circuit 6 are shifted as shown in FIGS. 5B to 5E using the color wheel 2 of FIG. 2, that is, the generation timing of the period T1 is changed. When the image is shifted, an image in which red is strong and the luminance is low can be projected on the screen 8 as compared with the case where the generation timing of the period T1 is not shifted.
[0057]
In this example, when the setting unit 9 is set to turn off all the pixels of the reflection device 5 during the period T1, the color balance and the brightness of the image projected on the screen 8 can be adjusted. When the setting unit 9 sets to turn on all the pixels of the reflection device 5 during the period T1, the color balance adjustment and the luminance adjustment performed during the period T1 are performed by the color balance adjustment and the luminance adjustment during the period T1. Are almost cancelled, so that the operation of adjusting the color balance and the luminance in the period excluding the period T1 as described above is not performed. Therefore, also in this example, the setting unit 9 has two color characteristics depending on whether the setting is such that all the pixels of the reflection device 5 are turned on or all the pixels of the reflection device 5 are turned off during the period T1. .
[0058]
In the embodiment described above, the illustrated configuration is merely an example, and the present invention is not limited to the configuration. For example, instead of the specular reflection type light modulation element, the image light may be generated using a liquid crystal panel used in a liquid crystal projector.
[0059]
Although a transmission filter is used for the color wheel, a filter that reflects R (red), green (G), and blue (B) light may be used instead. In this case, the reflected light from each of the reflection filters R, G, and B is sequentially applied to the specular reflection type light modulation element.
[0060]
【The invention's effect】
As described above, according to the present invention, it is possible to adjust the color tone of a display image even when a color wheel having a fixed color ratio is used alone, so that the color tone of a display image can be changed with a simple configuration. Becomes possible.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a schematic configuration of a color image display device according to a first embodiment of the present invention.
FIG. 2 is a schematic diagram showing a color wheel 2 shown in FIG.
FIG. 3 is a schematic diagram showing a state in which the color wheel 2 shown in FIG.
FIG. 4 is a schematic diagram showing a state in which the color wheel 2 shown in FIG.
FIG. 5 is a schematic diagram showing a state in which the color wheel 2 shown in FIG.
FIG. 6 is a schematic diagram showing an example of a color wheel 2 used in a color image display device according to an embodiment of the present invention.
FIG. 7 is a schematic diagram showing another example of the color wheel 2 used in the color image display device according to the embodiment of the present invention.
FIG. 8 is a block diagram showing a schematic configuration of a digital image display system described in JP-A-9-163391.
FIG. 9 is a schematic diagram of a color wheel used in a conventional time-division color separation device.
FIG. 10 is a schematic diagram of a color wheel provided with a plurality of color rings having different color ratios described in Japanese Patent Application Laid-Open No. 9-163391.
[Explanation of symbols]
1 light source
2 Color wheel
2R, 2B, 2W, 2G filter
21 border
3 Light bulb
4 Reflector
5 Reflective device
6 Drive circuit
7 Projection lens
8 screen
9 Setting section
10 Color wheel drive

Claims (6)

A plurality of filters having different spectral characteristics are arranged at a predetermined ratio in the circumferential direction to color-separate white light from the light source in a time-division manner, and modulate light of different color components generated by the plurality of filters. An image adjustment method of a color image display device for sequentially generating the image light of the different color components by sequentially irradiating the image light, and projecting and displaying the sequentially generated image light of the different color components on a screen,
The modulation unit is in an adjustment state of changing a color balance and / or luminance of an image projected and displayed on the screen during a first period including a period in which boundaries between the plurality of filters are irradiated with the white light, The color balance and / or the brightness of the image projected and displayed on the screen is changed by adjusting the timing at which the boundaries of the plurality of filters are irradiated with the white light and the start timing of the first period. An image adjustment method for a color image display device. A plurality of filters having different spectral characteristics are arranged at a predetermined ratio in the circumferential direction to color-separate white light from the light source in a time-division manner, and modulate light of different color components generated by the plurality of filters. An image adjustment device of a color image display device that sequentially generates the image light of the different color components by sequentially irradiating the image light of the different color components, and sequentially projects and displays the image light of the different color components on a screen.
The modulation unit is in an adjustment state of changing a color balance and / or luminance of an image projected and displayed on the screen during a first period including a period in which boundaries between the plurality of filters are irradiated with the white light, The color balance and / or the brightness of the image projected and displayed on the screen is changed by adjusting the timing at which the boundaries of the plurality of filters are irradiated with the white light and the start timing of the first period. An image adjustment device for a color image display device. A light source that outputs white light,
A color wheel having a color ring in which a plurality of filters having different spectral characteristics are arranged at a predetermined ratio in a circumferential direction,
Color wheel moving means for moving the color wheel in a direction crossing the optical path of the white light,
A signal output unit that sequentially outputs the video signal corresponding to the light of the different color components intermittently while leaving a desired interval corresponding to a boundary of the plurality of filters;
Modulation in which a pixel state corresponding to the video signal is formed in accordance with the input of the video signal and light of different color components separated by the color ring is sequentially irradiated to sequentially generate image light of the different color component. Means,
And projecting means for enlarging and projecting the image light of the different color component generated by the modulating means onto a screen.
The signal output unit is in an adjustment state for changing a color balance and / or a luminance of an image projected and displayed on the screen during a first period including a period in which boundaries between the plurality of filters are irradiated with the white light. A first period from when the desired interval is started to when the boundary reaches the center of the white light irradiated on the color ring, and the white light when the boundary is irradiated on the color ring; A second period from when the center of the image reaches the center to when the desired interval ends. A light source that outputs white light,
A color wheel having a color ring in which a plurality of filters having different spectral characteristics are arranged in a circumferential direction at a predetermined ratio shifted by a predetermined amount from a reference ratio,
Color wheel moving means for moving the color wheel in a direction crossing the optical path of the white light,
A signal output unit that sequentially outputs the video signal corresponding to the light of the different color components intermittently while leaving a desired interval corresponding to a boundary of the plurality of filters at a timing corresponding to the reference ratio,
Modulation in which a pixel state corresponding to the video signal is formed in accordance with the input of the video signal and light of different color components separated by the color ring is sequentially irradiated to sequentially generate image light of the different color component. Means,
And projecting means for enlarging and projecting the image light of the different color component generated by the modulating means onto a screen.
The signal output unit is in an adjustment state for changing a color balance and / or a luminance of an image projected and displayed on the screen during a first period including a period in which boundaries between the plurality of filters are irradiated with the white light. A color image display device for adjusting a luminance or a color balance of an image projected on the screen based on a difference between the predetermined ratio and the reference ratio. A light source that outputs white light,
A color wheel having a color ring in which a plurality of filters having different spectral characteristics are arranged at a predetermined ratio in a circumferential direction,
Color wheel moving means for moving the color wheel in a direction crossing the optical path of the white light,
A signal output unit that sequentially outputs the video signal corresponding to the light of the different color components intermittently while leaving a desired interval corresponding to a boundary of the plurality of filters;
Modulation in which a pixel state corresponding to the video signal is formed in accordance with the input of the video signal and light of different color components separated by the color ring is sequentially irradiated to sequentially generate image light of the different color component. Means,
And projecting means for enlarging and projecting the image light of the different color component generated by the modulating means onto a screen.
A color image display device, comprising: an adjusting unit that adjusts a color balance and / or a luminance of an image projected and displayed on the screen by adjusting a timing of outputting a video signal in the signal output unit. The signal output unit outputs a first state in which no video signal is output to the modulation unit during the desired interval and a second state in which a uniform image signal is output to the modulation unit to form a uniform image. The color image display device according to any one of claims 3 to 5, further comprising switching means for switching between the first state and the second state.

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