JP2015075674A - Color phase adjustment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color phase adjustment system that enables an inspector to grasp the state of mixed color light.SOLUTION: An optical filter 22 is irradiated with rays of light and transmits, of the rays of light, light other than light of an adjustment object, and is arranged in an optical path on the downstream of a color wheel 14 so that the optical filter 22 is irradiated with image light emitted from a projection lens 21.

Description

  The present invention relates to a color phase adjustment system for adjusting a color phase of a projection type image display apparatus having a color wheel.

  As a color phase control technique for a projection-type image display apparatus that projects image light, there are techniques disclosed in Patent Document 1, Patent Document 2, Patent Document 3, and Patent Document 4.

  The timing at which each of red light, green light, and blue light obtained by time-division color separation of white light by the color wheel is applied to the light modulation element and the timing at which the image data used by the light modulation element is switched. It is necessary to match. Therefore, a projection image display apparatus is generally provided with a sensor that detects rotation of a motor that rotates a color wheel.

  In addition, synchronization is achieved by adjusting the timing of detecting the rotation of the color wheel and the delay time (correction time) of the timing for executing the sequence control for switching the image data of each color used by the light modulation element. Yes. The synchronization is the synchronization between the timing of rotation detection and the timing of executing a sequence for switching image data.

  Hereinafter, the color used in the sequence control is also referred to as a sequence control color. When the above-described synchronization is out of sync, that is, when the synchronization is not achieved, a part of the color different from the sequence control color at that time is mixed in the projection screen. Further, as the synchronization shift increases, color mixing occurs from the end side of the projection screen.

  Further, two color lights obtained by two adjacent filters are mixed (mixed) at the boundary between the filters of the respective colors formed on the color wheel. Therefore, in general, a fixed blanking time is provided when switching between colors by sequence control. Blanking is a loss of light. Therefore, it is desirable that the blanking time is as short as possible.

  In addition, a color phase adjustment technique is disclosed in Patent Document 1 (hereinafter referred to as related technique A). In Related Technology A, an inspector observes the waveform of an optical signal by using a photodiode and an oscilloscope.

  Specifically, in Related Art A, a photodiode is provided in the optical path of light emitted from the color wheel. Then, the inspector uses an oscilloscope to observe an optical signal indicating the light state measured by the photodiode, and adjusts the delay time (correction time) according to the state of the optical signal. Thereby, the above-described synchronization, that is, the phase of the color light is adjusted.

  Note that the red light, the green light, and the blue light that are obtained by the color wheel have different intensities. In Related Art A, by utilizing this fact, the intensity of light emitted from the color wheel is measured by using a photodiode to determine whether or not color mixing has occurred.

  Hereinafter, light in which a plurality of types of monochromatic light is mixed is also referred to as multicolor light. In the following, in the case where the monochromatic light included in the multi-color light is light to be adjusted, light other than the monochromatic light to be adjusted among the multi-color light is also referred to as mixed color light. The mixed color light is light mixed with the monochromatic light to be adjusted.

JP 2006-011081 A JP-A-9-127437 JP-A-8-051638 JP 2003-162001 A

  However, Related Art A has the following problems. Specifically, in the related art A, for example, when multiple color lights are generated by mixing two single color lights, the delay time (correction time) is adjusted based on the optical signal indicating the state of the multiple color lights. That is, the phase of the color light is adjusted. The multi-color light includes monochromatic light to be adjusted and mixed color light. That is, the optical signal indicating the state of the multi-color light is a signal obtained by combining the monochromatic light signal to be adjusted and the mixed color light signal.

  For this reason, in the related art A, when a plurality of color lights are generated, an optical signal obtained by combining a single color light signal to be adjusted and a mixed color light signal is observed. There's a problem. Therefore, in order to perform color adjustment with high accuracy, it is necessary to grasp (observe) the state of mixed color light.

  The present invention has been made to solve such a problem, and an object thereof is to provide a color phase adjustment system capable of grasping the state of mixed color light.

  In order to achieve the above object, a color phase adjustment system according to an aspect of the present invention performs time-division color separation on white light including first color light, second color light, and third color light that is monochromatic light. A projection-type image display device that projects image light onto a screen, and an optical filter that transmits light other than the monochromatic light to be adjusted among the irradiated light. The projection-type image display device includes a light source that emits the white light and a color wheel provided in an optical path of the white light, and the color wheel includes the first color light, the second color light, and A first color filter, a second color filter, and a third color filter that respectively transmit the third color light are arranged, and the projection-type image display device further uses output color light emitted from the color wheel. An image generation element having a function of generating the image light composed of the output color light, and a projection for emitting the image light so that the image light generated by the image generation element is projected onto the screen And the optical filter is disposed in an optical path downstream from the color wheel so that the image light emitted from the projection lens is irradiated to the optical filter. .

  In general, the color wheel alternately emits monochromatic light and multicolor light in which a plurality of different monochromatic lights are mixed as output color light.

  According to the present invention, when the output color light used by the image generation element to generate the image light is a plurality of color lights, the image light emitted from the projection lens is composed of a plurality of color lights. Further, the optical filter that transmits light other than the monochromatic light to be adjusted among the irradiated light is disposed so that the image light emitted from the projection lens is irradiated to the optical filter.

  Therefore, the optical filter transmits light other than the monochromatic light to be adjusted among the plurality of color lights constituting the image light. Thereby, only the mixed color light mixed in the single color light included in the plurality of color lights is extracted, and the mixed color light is projected onto the screen. That is, only mixed color light can be extracted. Thereby, the state of mixed color light can be easily grasped.

It is a figure which shows the structure of the projection type image display apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of the color phase adjustment system which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of a color wheel. It is a graph which shows the illumination intensity in each delay time. It is a figure which shows the structure of the color wheel as a modification.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same components are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof may be omitted.

<Embodiment 1>
FIG. 1 is a diagram showing a configuration of a projection type image display apparatus 100 according to Embodiment 1 of the present invention. For the sake of explanation, FIG. 1 also shows an optical filter 22 to be described later that is not included in the projection type image display apparatus 100.

  FIG. 2 is a diagram showing the configuration of the color phase adjustment system 1000 according to Embodiment 1 of the present invention. The color phase adjustment system 1000 includes a screen SC10, a projection image display device 100, and an optical filter 22 described later.

  Although details will be described later, the projection type image display apparatus 100 projects image light onto the screen SC10 by performing color separation on white light in a time division manner. Image light is light constituting an image. The screen SC10 is a projection screen on which image light is projected.

  First, the projection type image display apparatus 100 will be described in detail. Referring to FIG. 1, a projection image display apparatus 100 includes a signal separation unit 1, a control unit 2, a lamp drive unit 3, a rotation drive unit 4, an adjustment unit 5, an image control unit 6, and a motor. 12, a sensor 10, and an optical system 150.

  A video signal is input to the signal separation unit 1. The signal separation unit 1 separates the video signal into a synchronization signal and an image signal. The synchronization signal includes a synchronization signal VSYNC. The synchronization signal VSYNC is transmitted to the control unit 2. The image signal is composed of image signals R, G, and B. The image signals R, G, B are transmitted to the image control unit 6. Hereinafter, each of the image signals R, G, and B is also referred to as a monochromatic image signal. The monochromatic image signal is a signal indicating a monochromatic image.

  The control unit 2 controls the lamp drive unit 3, the rotation drive unit 4, the adjustment unit 5, and the image control unit 6. The lamp driving unit 3 controls a lamp 8 described later. The rotation drive unit 4 performs drive control of the motor 12.

  The image control unit 6 controls an image generation element 18 described later according to the control of the control unit 2.

  The motor 12 is connected to a color wheel 14 to be described later via the rotating unit 13. The rotating part 13 is a columnar member. The rotating unit 13 is provided coaxially with the rotating shaft of the motor 12. As the motor 12 rotates, the rotating unit 13 also rotates.

  The sensor 10 has a function of detecting a mark 11 described later. When the sensor 10 detects the mark 11, the sensor 10 transmits a detection signal indicating the detection to the adjustment unit 5.

  The optical system 150 includes an illumination optical system 151 and an imaging optical system 152. The illumination optical system 151 includes a light source L10, a rod lens 9, a color wheel 14, and relay lenses 15, 16, and 17.

  The light source L10 emits white light. The white light includes monochromatic light such as red light, green light, and blue light. Specifically, the light source L10 includes a lamp 8 and an elliptical mirror 7. The lamp 8 is a lamp that emits white light. The lamp 8 is driven by an alternating current. The elliptical mirror 7 reflects the white light so as to guide the white light emitted from the lamp 8 to the rod lens 9.

  The rod lens 9 makes the distribution state of the white light emitted from the light source L10 uniform and emits the white light. The color wheel 14 performs color separation on the white light emitted from the rod lens 9 in a time division manner.

  FIG. 3 is a diagram illustrating a configuration of the color wheel 14. Referring to FIG. 3, the color wheel 14 has a disk shape. The color wheel 14 is provided with color filters 14R, 14G, and 14B. As shown in FIG. 3, the color filters 14R, 14G, and 14B are arranged in a circle so as to be adjacent to each other.

  The color filter 14R transmits only red light included in white light. The color filter 14G transmits only green light included in white light. The color filter 14B transmits only blue light included in white light. Hereinafter, each of the color filters 14R, 14G, and 14B is also referred to as a single color filter. Hereinafter, the light transmitted through the color wheel 14 is also referred to as output color light.

  Referring to FIG. 1 again, the color wheel 14 is provided in the optical path of white light. The color wheel 14 emits output color light (for example, red light).

  The color wheel 14 is configured to rotate. Specifically, the color wheel 14 is configured to rotate at a constant frequency by the motor 12. By rotating, the color wheel 14 emits monochromatic light and multi-color light alternately as output color light. The monochromatic light is, for example, red light.

  Multi-color light is light in which a plurality of single-color lights are mixed. Specifically, the multi-color light is light in which at least two of red light, green light, and blue light are mixed. For example, at the timing when white light is irradiated on the boundary portion between the color filter 14R and the color filter 14G, the color wheel 14 emits a plurality of color lights in which red light and green light are mixed. That is, the output color light emitted from the color wheel 14 is single color light or multicolor light.

  As the color wheel 14 rotates, the above-described rotating unit 13 also rotates. A mark 11 is provided on a part of the surface of the rotating unit 13. The mark 11 is a mark for grasping the rotation state of the color wheel 14 (rotating unit 13).

  The relay lenses 15, 16, and 17 are lenses for efficiently transmitting the light emitted from the color wheel 14 to the imaging optical system 152.

  The imaging optical system 152 includes the flat mirror 19, the concave reflecting mirror 20, the image generating element 18, and the projection lens 21.

  The flat mirror 19 reflects the output color light emitted from the color wheel 14 that passes through the relay lenses 15, 16, and 17 to the concave reflecting mirror 20. The concave reflecting mirror 20 reflects the output color light emitted from the flat mirror 19 toward the image generating element 18. In other words, the image generation element 18 is irradiated with output color light.

  The image generation element 18 is an element having a function of generating image light using output color light. The image generation element 18 generates image light composed of the modulated output color light by modulating the intensity of the output color light. That is, the image light generated by the image generation element 18 is composed of output color light. That is, the image light generated by the image generation element 18 indicates the color of the output color light.

  The image generating element 18 is a reflective image generating element such as a DMD (Digital Micro mirror Device). The image generating element 18 emits image light toward the projection lens 21. The image generation element 18 is controlled by the image control unit 6 so as not to generate image light in principle during a period in which the output color light emitted to the image generation element 18 is a plurality of color lights.

  Hereinafter, the period in which the image generating element 18 generates image light is also referred to as an on period. In the following, a period in which the image generation element 18 does not generate image light is also referred to as an off period or a blanking period. That is, in the image generation element 18, the on period and the off period are alternately repeated.

  In the following, the timing at which the on period occurs is also referred to as on period timing. In the following, the timing at which the off period occurs is also referred to as off period timing.

  Hereinafter, a period in which the output color light applied to the image generation element 18 is monochromatic light is also referred to as a monochromatic light period. In the following, the period in which the output color light applied to the image generating element 18 is a plurality of color lights is also referred to as a multiple color light period.

  The multi-color light period is a period in which white light is applied to the boundary portion between two adjacent monochromatic filters arranged on the color wheel 14. The two monochrome filters are, for example, color filters 14R and 14G. The multi-color light period occurs three times during the period in which the color wheel 14 rotates once. Hereinafter, the output color light used to generate image light by the image generation element 18 is also referred to as target output color light.

  The image generation element 18 is controlled by the control unit 2 so that the off-period timing is the whole of the respective multi-color light periods. When the off period timing is the whole of each of the multi-color light periods, the on period timing is within the monochromatic light period. In this case, the target output color light is monochromatic light.

  The image generating element 18 is controlled by the control unit 2 so that the off-period timing becomes the specified timing T0. The specified timing T0 is a timing over a plurality of color light periods. When the off period timing is the specified timing T0, the on period timing is within the monochromatic light period. In this case, the target output color light is monochromatic light. In other words, the specified timing T0 is a timing for making the target output color light monochromatic light by the image generation element 18. Hereinafter, the surface of the screen SC10 on which image light is projected is also referred to as an image light projection surface.

  Note that the shorter the off period (blanking period), the higher the luminance of the image light. However, as the off period is shorter, the off period timing may deviate from the specified timing T0. When the off-period timing is not the prescribed timing T0, the on-period timing is within the multi-color light period. In this case, the target output color light is multi-color light.

  That is, in the image generation element 18, when the off period timing is not the prescribed timing T0, the target output color light is multi-color light. That is, in the image generation element 18, when the target output color light is a plurality of color lights because the off period timing is not the prescribed timing T0, a plurality of color regions are generated on the image light projection surface. The multi-color region is a region indicating the color of the multi-color light.

  Note that the end of the concave reflecting mirror 20 exists in the optical path of the image light emitted from the image generating element 18. The end of the concave reflecting mirror 20 has an effect of efficiently condensing light onto the pupil of the projection lens 21. The pupil of the projection lens 21 is the center of the projection lens 21.

  The projection lens 21 emits image light so that the image light generated by the image generation element 18 is projected onto the screen SC10. Thereby, image light is irradiated to the whole screen SC10.

  Next, processing performed when the mark 11 is detected will be described. As described above, the sensor 10 transmits a detection signal to the adjustment unit 5 when the mark 11 is detected (case). Hereinafter, the time when the sensor 10 detects the mark 11 is also referred to as a mark detection time. The detection signal is instantaneously transmitted to the adjustment unit 5 at the mark detection time. That is, the mark detection time is the time when the adjustment unit 5 receives the detection signal.

  The adjustment unit 5 transmits the delay time Δt to the control unit 2. The delay time Δt is the time from the mark detection time until the image output element 18 is irradiated with the desired output color light. The desired output color light is, for example, red light as monochromatic light.

  Hereinafter, the timing at which the image generation element 18 starts generating image light is also referred to as image light generation timing. While the color wheel 14 makes one rotation, the image light generation timing occurs three times. The first image light generation timing is, for example, the timing when the delay time Δt has elapsed from the mark detection time.

  Based on the received delay time Δt, the control unit 2 transmits, to the image generation element 18, a single-color image signal corresponding to the output color light that is emitted to the image generation element 18 at the image light generation timing. In this way, the image control unit 6 is controlled.

  Under the control of the control unit 2, the image control unit 6 transmits a single color image signal corresponding to the output color light applied to the image generation element 18 at the image light generation timing to the image generation element 18. That is, the delay time Δt is also a time for determining the transmission timing of the monochrome image signal. The monochromatic image signal is, for example, the image signal R.

  Here, as an example, it is assumed that the output color light applied to the image generation element 18 at the image light generation timing is red light. In this case, the image control unit 6 transmits an image signal R corresponding to red light to the image generation element 18. The image generation element 18 generates image light LR that forms an image indicated by the image signal R using red light. The image light LR is image light constituting a monochromatic image indicating red. The image generating element 18 emits the image light LR toward the projection lens 21. Thereby, the image light LR is irradiated to the screen SC10.

  Note that the same processing as described above is performed when the output color light applied to the image generation element 18 at the image light generation timing is green light or blue light. Thereby, the image light LG or the image light LB is irradiated to the screen SC10. The image light LG is image light constituting a monochromatic image indicating green. The image light LB is image light constituting a monochromatic image showing blue.

  By sequentially irradiating the screen SC10 with the image lights LR, LG, and LB, the inspector recognizes an image obtained by combining the image lights LR, LG, and LB.

  Next, the color phase adjustment system 1000 according to the present embodiment will be specifically described.

  As described above, the shorter the off period (blanking period), the higher the luminance of the image light. However, as the off period is shorter, the off period timing may deviate from the specified timing T0. Therefore, as described above, in the image generating element 18, when the target output color light is a multi-color light because the off period timing is not the prescribed timing T0, a multi-color region is generated on the image light projection surface. The specified timing is a timing over a plurality of color light periods as described above.

  In the color phase adjustment, a single monochromatic light (for example, red light) is used as light to be adjusted. Hereinafter, the monochromatic light to be adjusted is also referred to as adjustment target light.

  In the present embodiment, in order to grasp the state of the mixed color light, the following configuration is adopted. First, the optical filter 22 is used in the color phase adjustment system 1000. The shape of the optical filter 22 is a plate shape.

  The optical filter 22 transmits light other than the adjustment target light among the light irradiated on the optical filter 22. That is, the optical filter 22 removes the adjustment target light from the light irradiated on the optical filter 22. That is, the optical filter 22 is a filter that removes only a specific spectral component (light to be adjusted) of light.

  The optical filter 22 is disposed in the optical path downstream of the color wheel 14 so that the image light emitted from the projection lens 21 is irradiated onto the optical filter 22. Specifically, as shown in FIG. 2, the optical filter 22 is disposed on the image light emission side of the projection lens 21 so that the image light emitted from the projection lens 21 is irradiated onto the optical filter 22.

  The projection type image display apparatus 100 has a normal mode and a color adjustment mode as operation modes. The normal mode is a mode in which the projection type image display apparatus 100 emits image light corresponding to a video signal. Specifically, the projection image display apparatus 100 in the normal mode projects image light corresponding to a video signal input from the outside onto the screen SC10.

  The color adjustment mode is a mode for adjusting the color phase of the light to be adjusted. That is, the color adjustment mode is a mode for adjusting the rotation timing of the color wheel 14. The configuration of the present embodiment is effective in the color adjustment mode.

  Next, the case where the operation mode of the projection type image display apparatus 100 is the color adjustment mode will be described. The projection-type image display device 100 in the color adjustment mode projects the image light composed of the adjustment target light onto the screen SC10 when the off period timing is the specified timing T0.

  At this time, if the adjustment of the off-period timing is accurate, a black image as a whole is displayed on the image light projection surface of the screen SC10. However, when the off-period timing is deviated from the specified timing T0, the mixed color light is projected onto the clean SC10.

  Here, as an example, it is assumed that the off-period timing is deviated from the specified timing T0 in the image generation element 18. That is, it is assumed that the off-period timing is not the prescribed timing T0 in the image generation element 18. As a result, it is assumed that the output color light used by the image generation element 18 to generate image light is multi-color light. As described above, light other than the adjustment target light among the plurality of color lights is also referred to as mixed color light. The mixed color light is light mixed in the adjustment target light.

  In this case, the image light emitted from the projection lens 21 is composed of a plurality of color lights. As described above, the optical filter 22 is arranged so that the image light emitted from the projection lens 21 is irradiated onto the optical filter 22.

  For this reason, the optical filter 22 transmits light other than the adjustment target light among the plurality of color lights constituting the image light. Thereby, only the mixed color light mixed in the single color light included in the plurality of color lights is extracted, and the mixed color light is projected onto the screen SC10. That is, only mixed color light can be extracted.

  Thereby, the state of mixed color light can be easily grasped. As a result, the inspector can observe only the mixed color light with the naked eye (visual observation). That is, the inspector can accurately inspect the state of the mixed color light.

  Further, the state of the mixed color light can be quantitatively evaluated by measuring the illuminance of the mixed color light with an illuminometer while the mixed color light is projected on the screen SC10.

  Next, processing for setting the delay time Δt (hereinafter, also referred to as delay time setting processing) in the present embodiment will be described. The color phase adjustment system 1000 that performs the delay time setting process includes illuminance meters 23a and 23b. The illuminance meters 23a and 23b are illuminance meters having the same function.

  Hereinafter, each of the illuminance meters 23 a and 23 b is also referred to as an illuminance meter 23. The illuminometer 23 has a function of measuring illuminance. Each illuminometer 23 is configured to be able to communicate with the projection image display apparatus 100. The illuminometer 23 transmits the illuminance to the projection type image display device 100 every time the illuminance is measured. Thereby, the control unit 2 receives the illuminance transmitted from the illuminometer 23. Each illuminometer 23 operates according to control by the control unit 2.

  As advance preparation for performing the delay time setting process, as shown in FIG. 2, an illuminometer 23 is arranged in a measurement region in a plurality of color regions in the image light projection plane. The multi-color area is an area generated when the target output color light is multi-color light. The multi-color region is a region showing multi-color light in which two monochromatic lights obtained by two adjacent monochromatic filters are mixed. The measurement area is an area for measuring illuminance.

  The multi-color light is light in which the adjustment target light and the monochromatic light obtained by the single color filter adjacent to one side of the single color filter for obtaining the adjustment target light are mixed. Further, the multi-color light is light in which the adjustment target light and the single color light obtained by the single color filter adjacent to the other side of the single color filter for obtaining the adjustment target light are mixed.

  Therefore, in the projection type image display apparatus 100, when the delay time Δt is deviated from a normal value, one of the above-described two types of multi-color light is generated. That is, when the off period timing starts to deviate from the specified timing T0, one of two types of multi-color light is generated.

  Note that when the off-period timing starts to deviate from the specified timing T0, the multiple-color region is generated from the horizontal end of the image light projection surface. Therefore, as shown in FIG. 2, the two illuminometers 23 are arranged in two measurement areas at the end (multiple color areas) in the image light projection plane. The two illuminance meters 23 each measure the illuminance of the two measurement areas. The two measurement regions are an upper region and a lower region at the end in the image light projection plane.

  The illuminometer 23 transmits the illuminance to the projection type image display device 100 every time the illuminance is measured. Thereby, the control unit 2 receives the illuminance transmitted from the illuminometer 23.

  The control unit 2 has a function of changing the delay time Δt. As described above, the delay time Δt is the time from the mark detection time until the image output element 18 is irradiated with the desired output color light. When the delay time Δt changes, the off period timing and the on period timing also change.

  The off period timing is the timing at which the off period occurs as described above. That is, the off period timing is also a timing at which the off period occurs. That is, the delay time Δt is a time for adjusting the off period timing. Hereinafter, the changed delay time Δt is also referred to as a changed delay time.

  The delay time setting process is performed when the operation mode of the projection type image display apparatus 100 is the color adjustment mode. In the delay time setting process, an illuminance measurement process is first performed. In the illuminance measurement process, every time the control unit 2 changes the delay time Δt, the illuminance meter 23 measures the illuminance of the measurement region.

  Specifically, every time the delay time Δt is changed by a predetermined value K, the control unit 2 controls the two illuminance meters 23 so that the two illuminance meters 23 measure the illuminances of the two measurement regions, respectively. . The predetermined value K is a negative or positive value. The predetermined value K is set in consideration of necessary adjustment accuracy with respect to the delay time Δt. Hereinafter, the illuminance of the measurement region is also referred to as measurement illuminance.

  Thereby, the control part 2 acquires two measurement illumination intensity corresponding to each change delay time.

  Following the illuminance measurement process, a graph formation process is performed. In the graph forming process, the control unit 2 generates a characteristic line L1 based on each change delay time and the sum of two measured illuminances corresponding to each change delay time. Hereinafter, the sum of the two measured illuminances corresponding to each change delay time is also referred to as illuminance ld. The characteristic line L1 is, for example, the characteristic line L1 shown in FIG. A characteristic line L1 indicates the illuminance ld corresponding to each delay time.

  In FIG. 4, the vertical axis represents the illuminance ld. The horizontal axis is the change delay time. Among the plurality of illuminances ld indicated by the characteristic line L1 in FIG. 4, the minimum plurality of illuminances ld are illuminances measured in a state where the off-period timing is the above-described specified timing T0. Hereinafter, the minimum illuminance ld among the multiple illuminances ld indicated by the characteristic line L1 is also referred to as the minimum illuminance. A characteristic line L1 indicates a plurality of minimum illuminances.

  Following the graph formation process, a setting process is performed. In summary, in the setting process, the control unit 2 sets the delay time Δt based on the illuminance ld corresponding to each change delay time so that the off period timing becomes the specified timing T0.

  In the setting process, first, the control unit 2 calculates a median value of each change delay time corresponding to a range indicating a plurality of minimum illuminances indicated by the characteristic line L1. Specifically, the control unit 2 calculates an average value (median value) of a plurality of change delay times respectively corresponding to a plurality of minimum illuminances indicated by the characteristic line L1 as a set delay time (set value). Then, the control unit 2 sets the delay time Δt used when controlling the image generating element 18 to the calculated set delay time.

  The calculation method of the set delay time is not limited to the above, and other calculation methods may be used.

  When the number of minimum illuminances indicated by the characteristic line L1 is 1, the change delay time corresponding to the one minimum illuminance is set to the delay time Δt used when controlling the image generating element 18.

  Thus, the delay time setting process ends. By performing the delay time setting process, the off period timing can be accurately adjusted to the specified timing T0. As a result, it is possible to reliably realize that the image light generated by the image generation element 18 does not include mixed color light.

  As described above, according to the present embodiment, when the output color light used by the image generating element 18 to generate image light is multi-color light, the image light emitted from the projection lens 21 is multi-color light. Composed. Further, the optical filter 22 that transmits light other than the adjustment target light among the irradiated light is arranged so that the image light emitted from the projection lens 21 is irradiated to the optical filter 22.

  For this reason, the optical filter 22 transmits light other than the adjustment target light among the plurality of color lights constituting the image light. Thereby, only the mixed color light mixed in the single color light included in the plurality of color lights is extracted, and the mixed color light is projected onto the screen SC10. That is, only mixed color light can be extracted. Thereby, the state of mixed color light can be easily grasped.

  As a result, the inspector can observe only the mixed color light with the naked eye (visual observation). That is, in the visual inspection process, the inspector can accurately inspect the state of the mixed color light. As a result, inspection can be facilitated. Therefore, the inspection variation for each inspector can be suppressed. Moreover, it is possible to reliably prevent the outflow of defective products by visual inspection.

  Further, in a state where the mixed color light is projected on the screen SC10, the inspector measures the illuminance of the mixed color light with an illuminometer. Thereby, the state of the mixed color light on the image light projection surface can be quantitatively evaluated. For example, it is possible to quantitatively evaluate the state of mixed color light on the image light projection surface during color phase adjustment.

  Further, in a state where the mixed color light is projected on the screen SC10, the inspector can accurately measure the illuminance of only the mixed color light by measuring the illuminance of the mixed color light with an illuminometer. As a result, the inspector can accurately determine the timing at which no color mixture exists.

  Further, according to the present embodiment, the illuminance of only the mixed color light extracted by the optical filter 22 can be measured. Therefore, it is possible to accurately determine the state of mixed color light with a measuring instrument such as an illuminometer.

  In the present embodiment, unlike the conventional case, the optical filter 22 is disposed outside the optical system 150 of the projection type image display apparatus 100. Therefore, installation of the optical filter 22 can be facilitated. As a result, the color phase adjustment can be easily performed.

  In the present embodiment, the delay time setting process is performed, so that the off-period timing can be accurately adjusted to the specified timing T0. That is, the off period timing can be adjusted with high accuracy. As a result, it is possible to reliably realize that the image light generated by the image generation element 18 does not include mixed color light.

  As described above, the related technique A has a problem that the color cannot be adjusted with high accuracy. In order to perform color adjustment with high accuracy, it is necessary to grasp (observe) the state of mixed color light. When the off-period timing starts to deviate from the specified timing T0, it is necessary to observe light in a plurality of color areas generated at the end of the image light projection surface.

  In Related Art A, the photodiode is installed between the light modulation element and the projection lens, that is, inside the optical system. For this reason, the related technique A has a problem in that it takes time to install a photodiode and may disturb the optical system.

  On the other hand, since the present embodiment is configured as described above, it is possible to solve the above-described problem of Related Technology A.

  Further, in the color phase adjustment, it is necessary to observe mixed color light in a state where a single color image (for example, a red image) composed of single color image light is projected on the screen. As the blanking time is shortened, the color phase adjustment becomes more severe, and it is required to quantitatively observe the exact timing at which color mixing occurs. In addition, regarding the visual inspection process of the image light projection surface, there is an inconvenience that the determination of the presence or absence of mixed color light generation with the naked eye in the image light projection surface is not accurate.

  On the other hand, since the present embodiment is configured as described above, the above-described problems in color phase adjustment can be solved.

  In the present embodiment, the delay time Δt is set by the control unit 2, but is not limited to this configuration. For example, the delay time Δt may be set by a configuration (hereinafter also referred to as a modified configuration A) performed by an external PC (Personal Computer).

  In the modified configuration A, the PC is configured to be able to communicate with the projection image display apparatus 100. In the modified configuration A, the PC performs the above-described illuminance measurement process according to the control program. That is, in the modified configuration A, each time the PC changes the delay time Δt by a predetermined value K, the PC controls each illuminometer 23 so that each illuminometer 23 measures the illuminance in the measurement region.

  Then, the PC performs the above-described graph formation processing and processing for calculating the set delay time in the delay time setting processing, and transmits a delay operation signal to the control unit 2. The delay operation signal is a signal for setting the delay time Δt used when controlling the image generating element 18 to the set delay time. The control unit 2 that has received the delay operation signal sets the delay time Δt to the calculated set delay time in accordance with the delay operation signal.

  In the present embodiment, the optical filter 22 is arranged on the image light emitting side of the projection lens 21, but the present invention is not limited to this. The optical filter 22 may be disposed anywhere in the optical path of light in the optical system 150 as long as it is downstream of the color wheel 14.

  In the present embodiment, the color wheel 14 is configured to include three single color filters. However, the present invention is not limited to this. The color wheel 14 may have a configuration in which four or more monochrome filters are arranged (hereinafter also referred to as a modified configuration B).

  In the modified configuration B, for example, as shown in FIG. 5, four single color filters are arranged on the color wheel 14. Specifically, the color wheel 14 is provided with color filters 14R, 14G, 14B, and 14W. The color filter 14W is a filter that transmits white light.

  Further, the single color filter disposed on the color wheel 14 is not limited to the color filters 14R, 14G, 14B, and 14W, and may be other color filters.

(Other variations)
While the color phase adjustment system according to the present invention has been described based on the embodiments, the present invention is not limited to these embodiments. The present invention also includes modifications made to the present embodiment by those skilled in the art without departing from the scope of the present invention. That is, in the present invention, the embodiments can be appropriately modified and omitted within the scope of the invention.

  Further, the projection type image display apparatus 100 of the color phase adjustment system 1000 may not include all the components shown in FIG. That is, the projection type image display apparatus 100 may include only the minimum components that can realize the effects of the present invention.

  In addition, the present invention may be realized as a color phase adjustment method in which operations of characteristic components included in the color phase adjustment system 1000 are steps. In the present invention, the computer may execute each step included in the color phase adjustment method. The present invention may also be realized as a program that causes a computer to execute each step included in such a color phase adjustment method. Further, the present invention may be realized as a computer-readable recording medium that stores such a program. The program may be distributed via a transmission medium such as the Internet.

  All the numerical values used in the above-mentioned embodiment are examples of numerical values for specifically explaining the present invention. That is, the present invention is not limited to the numerical values used in the above embodiments.

  The color phase adjustment method according to the present invention corresponds to a delay time setting process. The order in which the processes in the color phase adjustment method are executed is an example for specifically explaining the present invention, and may be in an order other than the above. Also, part of the processing in the color phase adjustment method and other processing may be executed in parallel independently of each other. In the present invention, the embodiments can be appropriately modified and omitted within the scope of the invention.

  For example, the number of measurement areas in the plurality of color areas is not limited to 2, and may be 1 or 3 or more. That is, the number of illuminance meters 23 installed in the multiple color region may be one or three or more (hereinafter also referred to as modified configuration C).

  For example, the modified configuration C is a configuration in which one illuminance meter 23 is arranged in one measurement region in a plurality of color regions. In the case of this configuration, in the illuminance measurement process of the delay time setting process described above, the control unit 2 causes the illuminometer 23 to measure the illuminance of the measurement region every time the delay time Δt is changed by a predetermined value K. The illuminance meter 23 is controlled. In the graph formation process, the characteristic line L1 is generated with the illuminance ld corresponding to each change delay time measured by one illuminometer 23. Then, setting processing is performed in the same manner as described above.

  2 control unit, 14 color wheel, 18 image generation element, 21 projection lens, 22 optical filter, 23, 23a, 23b illuminometer, 100 projection type image display device, 1000 color phase adjustment system, L10 light source, SC10 screen.

Claims (3)

A projection-type image display device that projects image light onto a screen by performing time-division color separation on white light including first-color light, second-color light, and third-color light that is monochromatic light; A color phase adjustment system including an optical filter that transmits light other than the monochromatic light to be adjusted,
The projection-type image display device
A light source that emits the white light;
A color wheel provided in the optical path of the white light,
The color wheel includes a first color filter, a second color filter, and a third color filter that transmit the first color light, the second color light, and the third color light, respectively.
The projection-type image display device further includes:
An image generating element having a function of generating the image light composed of the output color light using the output color light emitted from the color wheel;
A projection lens that emits the image light so that the image light generated by the image generation element is projected onto the screen;
The color phase adjustment system, wherein the optical filter is disposed in an optical path downstream from the color wheel so that the image light emitted from the projection lens is irradiated onto the optical filter. The color phase adjustment system according to claim 1, wherein the optical filter is disposed on an emission side of the image light in the projection lens. The color wheel alternately emits the monochromatic light and a plurality of color lights in which at least two of the first color light, the second color light, and the third color light are mixed as the output color light,
In the image generation element, an on period in which the image generation element generates the image light and an off period in which the image generation element does not generate the image light are alternately repeated.
If the output color light is the multi-color light because the timing at which the off period occurs is not a specified timing for making the output color light used for generating the image light the single color light, the screen A plurality of color areas indicating colors of the plurality of color lights are generated on the surface on which the image light is projected,
The color phase adjustment system further includes:
An illuminometer that is disposed in a measurement region for measurement within the plurality of color regions and measures the illuminance of the measurement region;
The projection-type image display device further includes:
A control unit having a function of changing a delay time for adjusting the timing at which the off period occurs;
The control unit further includes:
(A) Every time the delay time is changed, the illuminance meter measures the illuminance of the measurement region by performing a process of measuring the illuminance of the measurement region corresponding to the changed delay time. Acquired,
(B) The delay time is set so that the timing at which the off period occurs becomes the specified timing based on the illuminance of the measurement region corresponding to each change delay time. Color phase adjustment system.

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