CN112005547A - Optical phase control device and display device - Google Patents
Optical phase control device and display device Download PDFInfo
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- CN112005547A CN112005547A CN201980026796.9A CN201980026796A CN112005547A CN 112005547 A CN112005547 A CN 112005547A CN 201980026796 A CN201980026796 A CN 201980026796A CN 112005547 A CN112005547 A CN 112005547A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
Abstract
The display device is provided with: a phase distribution calculation circuit that generates data of a plurality of phase distributions for each wavelength, the phase distributions corresponding to reproduced images for each wavelength reproduced by the optical phase modulation element; and a drive circuit that generates a plurality of applied voltages for each wavelength to be applied to the optical phase modulation element based on data of a plurality of phase distributions for each wavelength, and that temporally modulates the phases of a plurality of lights having temporally different wavelengths, which have entered separately, by the optical phase modulation element for each wavelength. The drive circuit generates a plurality of applied voltages such that the voltage ranges are different for each wavelength, and such that as the wavelength increases, the minimum value of the voltage range decreases and the maximum value increases.
Description
Technical Field
The present invention relates to a light phase controller for controlling an optical phase modulation apparatus and a display using the same.
Background
An optical phase modulation device that modulates the phase of light and obtains a desired reproduced image is known. The optical phase modulation device includes, for example, an SLM (spatial light modulator) such as a liquid crystal panel. As an application example of such an optical phase modulation device, there is a technique in which a projector generates a reproduced image whose phase is modulated in accordance with an image by using the optical phase modulation device for an illumination device in the projector, and uses the reproduced image as illumination light toward a light intensity modulation device for image display. Further, the optical phase modulation device is used for a hologram technique or the like. In addition, the optical phase modulation device is also used in technologies such as an optical switch, an optical computer, and the like.
Documents of the prior art
Patent document
Patent documents: japanese unexamined patent application publication No. 2015-184288
Patent documents: japanese unexamined patent application publication (translation of PCT application) No. 2015-505971
Disclosure of Invention
When moving images are displayed by using an optical phase modulation device using liquid crystals, in particular, when full-color display is performed using a field sequential method (time division method), a low response speed of the liquid crystals may deteriorate reproduced images.
It is desirable to provide an optical phase controller and a display capable of improving the image quality of a reproduced image produced by an optical phase modulation apparatus.
An optical phase controller according to an embodiment of the present disclosure includes: a phase distribution arithmetic circuit that generates a plurality of pieces of phase distribution data for each wavelength corresponding to a reproduced image for each wavelength to be reproduced by the optical phase modulation device, and a drive circuit; and a drive circuit that generates a plurality of applied voltages for each wavelength to be applied to the optical phase modulation device based on a plurality of pieces of phase distribution data for each wavelength, and causes the optical phase modulation device to modulate phases of a plurality of lights having different wavelengths and entering in a time-division manner for each wavelength, wherein the drive circuit generates the plurality of applied voltages such that a voltage range is different for each wavelength, and decreases a minimum value of the voltage range and increases a maximum value of the voltage range as the wavelength increases.
A display according to an embodiment of the present disclosure includes: a light source that emits a plurality of lights having different wavelengths in a time-division manner; an optical phase modulation device that modulates the phases of a plurality of lights from the light source in a time-division manner for each wavelength, and reproduces a plurality of reproduced images in a time-division manner for each wavelength; a phase distribution arithmetic circuit that generates a plurality of pieces of phase distribution data for each wavelength corresponding to a plurality of reproduction images for each wavelength to be reproduced by the optical phase modulation device; and a drive circuit that generates a plurality of applied voltages for each wavelength to be applied to the optical phase modulation device based on the plurality of pieces of phase distribution data for each wavelength, and causes the optical phase modulation device to modulate the phases of the plurality of lights in a time-division manner for each wavelength, wherein the drive circuit generates the plurality of applied voltages such that the voltage range is different for each wavelength, and decreases the minimum value of the voltage range and increases the maximum value of the voltage range as the wavelength increases.
In the optical phase controller or the display according to the embodiment of the present disclosure, the drive circuit generates a plurality of applied voltages for each wavelength to be applied to the optical phase modulation device based on a plurality of pieces of phase distribution data for each wavelength. The drive circuit generates a plurality of applied voltages so that the voltage range is different for each wavelength, and decreases the minimum value of the voltage range and increases the maximum value of the voltage range as the wavelength increases.
Drawings
Fig. 1 is a block diagram showing an exemplary configuration of a phase modulation apparatus including an optical phase controller according to a first embodiment of the present disclosure.
Fig. 2 is an explanatory diagram showing an outline of the optical phase modulation device.
Fig. 3 is a configuration diagram showing a first exemplary configuration of a projector as a display according to the first embodiment.
Fig. 4 is a configuration diagram showing a second exemplary configuration of a projector as a display according to the first embodiment.
Fig. 5 is an explanatory diagram showing an example of a voltage range of each color required for phase modulation of zero to two pi in the display according to the comparative example.
Fig. 6 is an explanatory diagram showing an example of the relationship between the phase modulation amount and the applied voltage of the display according to the comparative example.
Fig. 7 is an explanatory diagram showing a case where the optical phase modulation device displays the same reproduced image by using different phase distributions in the display according to the comparative example.
Fig. 8 is an explanatory diagram showing an example of a voltage range of each color required for phase modulation of zero to two pi in the display according to the first embodiment.
Fig. 9 is an explanatory diagram showing an example of the relationship between the phase modulation amount and the applied voltage of the display according to the first embodiment.
Fig. 10 is an explanatory diagram showing an example of the relationship between the amounts of voltage fluctuation generated at the time of switching of R and G wavelengths and the frequency of switching in the case where the same phase is displayed on the optical phase modulation device in the display according to the comparative example and the display according to the first embodiment.
Fig. 11 is an explanatory diagram showing an example of a relationship between the amounts of voltage fluctuation generated at the time of switching of G and B wavelengths and the frequency of switching in the case where the same phase is displayed on the optical phase modulation device in the display according to the comparative example and the display according to the first embodiment.
Fig. 12 is an explanatory diagram showing an example of the relationship between the amounts of voltage fluctuation generated at the time of switching of the B and R wavelengths and the frequency of switching in the case where the same phase is displayed on the optical phase modulation device in the display according to the comparative example and the display according to the first embodiment.
Fig. 13 is an explanatory diagram showing an example of a voltage range of each color required for phase modulation of zero pi to about two pi in the display according to the comparative example.
Fig. 14 is an explanatory diagram showing an example of the relationship between the phase modulation amount and the applied voltage of the display according to the comparative example.
Fig. 15 is an explanatory diagram showing an example of a voltage range of each color required for phase modulation of zero pi to about two pi in the display according to the second embodiment.
Fig. 16 is an explanatory diagram showing an example of the relationship between the phase modulation amount and the applied voltage of the display according to the second embodiment.
Fig. 17 is an explanatory diagram showing an example of the relationship between the voltage fluctuation amount generated at the time of switching of the R and G wavelengths and the switching frequency in the case where the same phase is displayed in the display according to the second embodiment.
Fig. 18 is an explanatory diagram showing an example of the relationship between the voltage fluctuation amount generated at the time of switching of the B and R wavelengths and the switching frequency in the case where the same phase is displayed in the display according to the second embodiment.
Fig. 19 is an explanatory diagram showing a first example of a target phase distribution data generation method of a display according to the third embodiment.
Fig. 20 is an explanatory diagram showing a second example of a target phase distribution data generation method of a display according to the third embodiment.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Note that the description will be made in the following order.
1. First embodiment (FIGS. 1 to 12)
1.0 comparative example
1.1 configuration and operation of optical phase controller and display according to the first embodiment
1.2 Effect
2. Second embodiment (FIGS. 13 to 18)
3. Third embodiment (FIGS. 19 and 20)
4. Other embodiments
<1. first embodiment >
[1.0 comparative example ]
When moving images are displayed by using an optical phase modulation device using liquid crystals, in particular, when full-color display is performed using a field sequential method, a low response speed of the liquid crystals may deteriorate reproduced images.
Patent document 1 (japanese unexamined patent application publication No. 2015-184288) discloses a high-speed phase distribution generation technique, and it is assumed that the technique can cope with field sequential driving. However, even if the phase distribution is generated at a high speed, the liquid crystal of the optical phase modulation device may not sufficiently respond to the switching of the phase distribution. Therefore, deterioration such as noise generation, luminance reduction, contrast reduction, flicker, and the like may occur in the reproduced image.
Patent document 2 (japanese unexamined patent application publication (translation of PCT application) No. 2015-505971) discloses a high-speed phase distribution generation method based on the geschberg-Saxton (GS method) method using fourier transform. According to the technique described in patent document 2, a phase distribution is generated at high speed by receiving phase information of a previous frame as initial phase information of a next frame. In addition, by using this method, it is characterized in that the phase distributions to be converged with the respective frames are close to each other, and the variation of the voltage of the pixel is reduced. Therefore, the inclination of the liquid crystal does not change greatly when the phase distribution is switched, and deterioration of the reproduced image can be prevented. However, in the case of performing field sequential driving, the phase modulation amount and the voltage range of the applied voltage vary depending on the wavelength to be modulated. Therefore, even if the phase distributions of the frames can be made close to each other, since the voltages finally applied are different from each other, it is impossible to avoid deterioration of the reproduced image.
Therefore, in the present disclosure, there is provided a technique of improving the image quality of a reproduced image by adjusting the voltage range of the applied voltage of the optical phase modulation device for each wavelength whose phase is modulated and reducing the voltage variation amount of each pixel between frames when performing field sequential driving on the optical phase modulation device using liquid crystal.
[1.1 arrangement and operation of optical phase controller and display according to first embodiment ]
(overview of phase modulating apparatus including optical phase controller)
Fig. 1 schematically shows an exemplary configuration of a phase modulation apparatus including an optical phase controller according to a first embodiment of the present disclosure.
The phase modulation apparatus includes an optical phase modulation device 1 that modulates the phase of light from a light source 50, a phase distribution arithmetic circuit 51, and a phase modulation device drive circuit 52.
The optical phase controller according to the present disclosure includes at least a phase distribution arithmetic circuit 51 and a phase modulation device drive circuit 52.
The phase distribution arithmetic circuit 51 is a phase distribution arithmetic unit that generates target phase distribution data (phase modulation signal) based on an input signal. The target phase distribution data is data having a phase distribution with which the optical phase modulation device 1 can reproduce the target reproduced image 60 (target reproduced image).
Here, for example, in the case where the optical phase modulation device 1 is used as part of an illumination device of a projector, the input signal is, for example, an image signal. In this case, the reproduced image 60 is an illumination image obtained by illuminating the illumination target 5. The illumination target 5 is a light intensity modulation device (for example, an intensity modulation liquid crystal panel of a projector). In this case, the target phase distribution data is data having a phase distribution pattern with which an illumination image having a luminance distribution corresponding to an image displayed by the projector can be formed.
The phase modulation device drive circuit 52 generates an applied voltage (drive voltage) based on the target phase distribution data generated by the phase distribution arithmetic circuit 51, and drives the optical phase modulation device 1 to allow the pixels 10 to have the target phase distribution.
The optical phase modulation device 1 modulates the phase of light from the light source 50 based on the applied voltage given by the phase modulation device drive circuit 52. The optical phase modulation device 1 may be a transmission type phase modulation device or a reflection type phase modulation device.
In the phase modulation device shown in fig. 1. In the case where the phases of the plurality of lights each having a different wavelength are modulated using the field sequential method, the plurality of lights each having a different wavelength are emitted from the light source 50 in a time-division manner. The optical phase modulation device 1 time-divisionally modulates the phases of a plurality of lights from the light source 50 for each wavelength, and time-divisionally reproduces a plurality of reproduction images 60 for each wavelength. The phase distribution arithmetic circuit 51 generates a plurality of pieces of phase distribution data (target phase distribution data) corresponding to a plurality of reproduction images 60 for each wavelength to be reproduced by the optical phase modulation device 1, respectively, for each wavelength. The phase modulation device drive circuit 52 generates a plurality of application voltages to be applied to the optical phase modulation device 1 for each wavelength based on a plurality of pieces of phase distribution data for each wavelength, and causes the optical phase modulation device 1 to modulate the phases of a plurality of lights in a time-division manner for each wavelength.
(outline of optical phase modulation device 1)
Fig. 2 shows an outline of the optical phase modulation device 1. In fig. 2, an example is shown in which the optical phase modulation device 1 includes a phase modulation liquid crystal panel. The optical phase modulation device 1 includes, for example, a first glass substrate and a second glass substrate disposed so as to oppose each other. Between the first glass substrate and the second glass substrate, a liquid crystal layer including liquid crystal molecules 14 is sealed with a sealing member not shown.
The counter electrode (common electrode) 4 is disposed on the first glass substrate, and the plurality of pixel electrodes 11 (pixels 10) are disposed on the second glass substrate.
In the case where the optical phase modulation device 1 is a transmission type phase modulation device, each of the counter electrode 4 and the pixel electrode 11 includes a transparent electrode that transmits light. In the case where the optical phase modulation device is a reflective type phase modulation device, the counter electrode 4 includes a transparent electrode that transmits light, and the pixel electrode 11 includes a reflective electrode that reflects light.
A common voltage is applied to the counter electrode 4. An applied voltage depending on an input signal is applied to the plurality of pixel electrodes 11. The inclination of the liquid crystal molecules 14 in the optical phase modulation device 1 varies according to the applied voltage. As shown in the lower part of fig. 2, the phase distribution (refractive index distribution) with respect to light passing through the device changes by changing the inclination of the liquid crystal molecules 14. As a result, the optical operation can be changed in units of pixels.
Such an optical phase modulation device 1 is used, for example, as part of an illumination device that generates illumination light toward a light intensity modulation device of a projector.
(example of application shown)
In fig. 3 and 4, first and second exemplary configurations of a projector as a display according to a first embodiment using the phase modulation device in fig. 1 are shown, respectively. In fig. 3 and 4, an exemplary configuration of a projector that performs full-color display using the field sequential method is shown.
Each of the projector 100 shown in fig. 3 and the projector 100A shown in fig. 4 includes a light source 50, an optical phase modulation device 1, a light intensity modulation device 61, and a projection lens (projection optical system) 81.
Note that, in fig. 3 and 4, an exemplary configuration using a transmission type phase modulation device as the optical phase modulation device 1 is shown. However, a reflection type phase modulation device may be included in this configuration.
The projector 100 shown in fig. 3 shows an example in which a transmissive light intensity modulation device (for example, a transmissive light intensity modulation liquid crystal display panel) is used as the light intensity modulation device 61. The projector 100A shown in fig. 4 illustrates an example in which a reflective light intensity modulation device (for example, a reflective light intensity modulation liquid crystal display panel) is used as the light intensity modulation device 61.
The light source 50 includes a red light source emitting red (R) light, a green light source emitting green (G) light, and a blue light source emitting blue (B) light. Each of the light source for red, the light source for green, and the light source for blue includes, for example, one or more laser light sources. The light source 50 emits red light, green light, and blue light in a time division manner.
In the projectors 100 and 100A, the optical phase modulation device 1 is irradiated with light of each color from the light source 50. At this time, each of red light, green light, and blue light illuminates the optical phase modulation device 1 in a time-division manner. The optical phase modulation device 1 displays a phase distribution pattern optimized for each wavelength of each color in a time-division manner. The phase distribution arithmetic circuit 51 in fig. 1 generates phase distribution data (target phase distribution data) of each color corresponding to the reproduction image 60 of each color to be reproduced by the optical phase modulation device 1. The phase modulation device driving circuit 52 generates an applied voltage for each color to be applied to the optical phase modulation device 1 based on the phase distribution data for each color, and causes the optical phase modulation device 1 to modulate the phase of light having each color for each color in a time-division manner.
The light intensity modulation device 61 is irradiated with the reproduced image of each color formed by the optical phase modulation device 1 as illumination light of each color in a time-division manner. The light intensity modulation device 61 modulates the intensity of illumination light of each color in synchronization with the timing when the light source 50 emits light having each color, and generates a projection image of each color in a time-division manner.
The projection image of each color using each of red light, green light, and blue light is emitted toward the projection lens 81. The projection lens 81 projects the projection image of each color onto a projection surface such as the screen 80 in a time-division manner.
Note that, in the above, an exemplary configuration of a display in which the optical phase modulation device 1 and the light intensity modulation device 61 are combined has been described. However, the display may be a display that does not use the light intensity modulation device 61. For example, the display may be a display that uses the reproduced image 60 as a display image without using the reproduced image 60 formed by the optical phase modulation device 1 as illumination light.
(optimization of applied Voltage for each wavelength)
Fig. 5 shows an example of a voltage range of each color required for phase modulation of zero to two pi performed in the display according to the comparative example. In fig. 5, the horizontal axis represents the applied voltage (V) and the vertical axis represents the phase (pi). Fig. 6 shows an example of the relationship between the phase modulation amount and the applied voltage of the display according to the comparative example. In fig. 5, the horizontal axis represents the phase modulation amount (pi), and the vertical axis represents the applied voltage (V).
As shown in fig. 5, for the optical phase modulation device 1, the voltage range Vr of R (red), the voltage range Vg of G (green), and the modulation voltage range Vb of B (blue) required for phase modulation of zero pi to two pi are different from each other. As shown in fig. 5 and 6, the longer the wavelength, the larger the voltage range of the applied voltage. Further, in the comparative examples shown in fig. 5 and 6, the maximum value of the voltage range in which the applied voltage is generated to allow matching R, G, and the respective colors of B.
In this way, in the case where the optical phase modulation device 1 includes a phase modulation liquid crystal panel, even in the case where the optical phase modulation device 1 is to display the same phase distribution pattern, the applied voltage required to display the phase distribution pattern is different for each wavelength. Therefore, in the case where the phase modulation of each color is to be performed in a time-division manner, even if the phase distribution arithmetic circuit 51 can generate a phase distribution at high speed and with high quality, the reproduced image 60 is deteriorated due to the response speed of the liquid crystal of the optical phase modulation device 1.
Fig. 7 shows an example in which the optical phase modulation device 1 displays the same reproduced image 60 (checker pattern) by using different phase distributions in the display according to the comparative example. Fig. 7 shows, in order from the left side, an ideal reproduced image (still image), a reproduced image immediately after the phase distribution is switched, and a reproduced image when the response of the liquid crystal of the optical phase modulation device 1 is completed. Since the response of the liquid crystal is not completed immediately after the switching of the phase distribution, the reproduced image deteriorates. The deterioration in the reproduced image is manifested as a reduction in brightness, a reduction in contrast, noise generation, and the like. When the response of the liquid crystal is completed, luminance changes with time, flicker is generated, and a reproduced image deteriorates.
Therefore, in the case where phase modulation and image display using the field sequential method are to be performed, it is desirable to optimize the applied voltage for each wavelength as shown in fig. 8 and 9.
Fig. 8 shows an example of a voltage range of each color required for phase modulation of zero pi to two pi in the display (example) according to the first embodiment. In fig. 8, the horizontal axis indicates the applied voltage (V), and the vertical axis indicates the phase (pi). Fig. 9 shows an example of the relationship between the phase modulation amount and the applied voltage of the display (example) according to the first embodiment. In fig. 9, the horizontal axis indicates the phase modulation amount (pi), and the vertical axis indicates the applied voltage (V).
In the optical phase controller and the display according to the first embodiment, the phase modulation device driving circuit 52 generates a plurality of applied voltages for each wavelength so that the voltage range is different for each wavelength, and decreases the minimum value of the voltage range and increases the maximum value of the voltage range as the wavelength increases. Specifically, the phase modulation device driving circuit 52 generates an applied voltage for each wavelength to allow the following conditions to be satisfied.
Rmin<Gmin<Bmin<Bmax<Gmax<Rmax
Here, it is assumed that the minimum value of the applied voltage of R is Rmin and the maximum value is Rmax. Assume that the minimum value of the applied voltage of G is Gmin and the maximum value is Gmax. Assume that the minimum value of the applied voltage of B is Bmin and the maximum value is Bmax.
By optimizing the applied voltage as described above, the amount of voltage fluctuation at the time of switching the wavelength can be reduced.
Each of fig. 10 and 12 shows an example of a relationship between the amount of voltage fluctuation generated when switching the wavelength and the frequency of switching in the case where the same phase is displayed on the optical phase modulation device 1 in the display according to the comparative example and the display (example) according to the first embodiment. In fig. 10 to 12, the horizontal axis indicates the voltage fluctuation amount, and the vertical axis indicates the frequency. The frequency corresponds to the number of pixels in which the amount of voltage fluctuation occurs.
Fig. 10 shows the amount of voltage fluctuation (difference in applied voltage) in the case of wavelength switching of R and G. Fig. 11 shows the amount of voltage fluctuation (difference in applied voltage) in the case of wavelength switching of G and B. Fig. 12 shows the amount of voltage fluctuation (difference in applied voltage) in the case of wavelength switching of B and R.
As shown in fig. 10 to 12, it can be understood that the state of the display (example) according to the first embodiment can be improved to a state in which the frequency of generating the amount of voltage fluctuation is small, as compared with the display according to the comparative example.
Note that as a method for setting the voltage range, the average values of the voltage ranges of the applied voltages of the respective colors may coincide with each other. For example, it is assumed that the phase modulation device driving circuit 52 generates an applied voltage quantized for each wavelength. In this case, for example, when it is assumed that the number of division times (number of quantization levels) of the applied voltage of each color is N and the applied voltage corresponding to the division point is VNThen, the voltage range can be set to match (Σ V)N)/N。
[1.2 Effect ]
As described above, according to the optical phase controller and the display according to the first embodiment, a plurality of applied voltages for each wavelength to be applied to the optical phase modulation device 1 are generated so that the voltage range is different for each wavelength and when the minimum value of the voltage range is decreased and the maximum value of the voltage range is increased as the wavelength increases. Therefore, the image quality of the reproduced image 60 produced by the optical phase modulation device 1 can be improved.
According to the optical phase controller and the display of the first embodiment, effects such as noise reduction, luminance improvement, contrast improvement, flicker prevention, color reproducibility improvement, prevention of generation of an inter-frame residual image, and the like of the reproduced image 60 are obtained by the optical phase modulation device 1.
It is noted that the effects described herein are merely exemplary and not limiting. Further, other effects can be obtained. The same applies to the effects of the other embodiments below.
<2 > second embodiment
Next, an optical phase controller and a display according to a second embodiment of the present disclosure will be described. Note that, hereinafter, portions substantially the same as those of the optical phase controller and the display according to the first embodiment are denoted by the same reference numerals, and description thereof is appropriately omitted.
Fig. 13 shows an example of a voltage range of each color required for phase modulation of zero pi to about two pi in the display according to the comparative example. In fig. 13, the horizontal axis indicates the applied voltage (V), and the vertical axis indicates the phase (pi). Fig. 13 shows an example of the relationship between the phase modulation amount and the applied voltage of the display according to the comparative example. In fig. 13, the horizontal axis indicates the phase modulation amount (pi), and the vertical axis indicates the applied voltage (V).
Fig. 15 shows an example of a voltage range of each color required for phase modulation of zero pi to about two pi in the display (example) according to the second embodiment. In fig. 15, the horizontal axis indicates the applied voltage (V), and the vertical axis indicates the phase (pi). Fig. 16 shows a relationship between the phase modulation amount and the applied voltage of a display (example) according to the second embodiment. In fig. 16, the horizontal axis indicates the phase modulation amount (pi), and the vertical axis indicates the applied voltage (V).
The setting of the voltage range in the comparative example shown in fig. 13 is substantially similar to that of the comparative example (fig. 5) with respect to the first embodiment except for the applied voltage having the longest wavelength (applied voltage of R). Further, the setting of the voltage range in the display (example) according to the second embodiment in fig. 15 is substantially similar to that in the first embodiment (fig. 8) except for the applied voltage having the longest wavelength (the applied voltage of R).
In the display according to the comparative example and the display (example) according to the second embodiment, the phase modulation device driving circuit 52 generates the applied voltage quantized for each wavelength. Further, the plurality of applied voltages are quantized for each wavelength to allow the number of quantization levels of the applied voltage having the longest wavelength to be smaller than the number of quantization levels of the applied voltages having other wavelengths.
In the case where the same phase modulation amount is required for each wavelength, the longer the wavelength is, the wider the voltage range of the applied voltage is. Therefore, by lowering the quantization level of the phase distribution on the long wavelength side, the voltage range of the applied voltage can be reduced, and the voltage ranges of the applied voltages of the respective wavelengths can be brought close to each other. Therefore, the voltage fluctuation amount at the time of switching the phase distribution can be further reduced.
With regard to the display according to the comparative example and the display (example) according to the second embodiment, an example is indicated in which the quantization level of the applied voltage of R is set to 16 levels, and the maximum modulation amount is set to 1.85 pi. Note that the quantization levels of G and B are 256 levels, for example, and the maximum modulation amount is 2 pi.
Each of fig. 17 and 18 shows an example of a relationship between the amount of voltage fluctuation generated when switching the wavelength and the frequency of switching in the case where the same phase is displayed on the optical phase modulation device 1 in the display according to the comparative example and the display (example) according to the second embodiment. In fig. 17 and 18, the horizontal axis indicates the amount of voltage fluctuation, and the vertical axis indicates the frequency. The frequency corresponds to the number of pixels in which the amount of voltage fluctuation occurs.
Fig. 17 shows the amount of voltage fluctuation (difference in applied voltage) in the case of wavelength switching of R and G. Fig. 18 shows the amount of voltage fluctuation (difference in applied voltage) in the case of wavelength switching of B and R.
As shown in fig. 17 and 18, it can be understood that the state of the display (example) according to the second embodiment can be improved to a state in which the frequency of occurrence of the amount of voltage fluctuation is small, as compared with the display according to the comparative example.
Other configurations, operations, and effects may be substantially similar to those of the optical phase controller and the display according to the first embodiment.
<3. third embodiment >
Next, an optical phase controller and a display according to a third embodiment of the present disclosure will be described. Note that, hereinafter, substantially the same portions as those of the components of the optical phase controller and the display according to the first or second embodiment are denoted by the same reference numerals, and description thereof is omitted as appropriate.
In the third embodiment, a specific example of generating a phase distribution by the phase distribution operation circuit 51 will be described.
(first example)
The phase distribution arithmetic circuit 51 in fig. 1 sequentially generates a plurality of pieces of phase distribution data for each wavelength. At this time, it is desirable that the phase distribution operation circuit 51 generate pieces of phase distribution data so as to minimize the amount of voltage change between the applied voltage generated based on the phase distribution data generated previously in terms of time and the applied voltage generated based on the current phase distribution data. For example, it is desirable that the phase distribution operation circuit 51 generates the current phase distribution data by referring to the phase distribution data previously generated in terms of time.
When the phase distributions of the respective frames are closer to each other, the image quality of the reproduced image 60 is improved. Therefore, when the phase distribution operation circuit 51 generates a phase distribution, it is desirable to generate a phase distribution so that voltage fluctuation between frames is reduced. To generate the phase distribution, there is a GS method of generating the phase distribution by repeating fourier transform shown in fig. 19, which will be described below. By setting the random initial phase given when the phase distribution is generated as the final phase distribution of the previous frame, the phase distributions to be converged of the respective frames can be brought close to each other. Since this operation reduces voltage fluctuation, the image quality of the reproduced image 60 is improved.
Fig. 19 shows a first example of a target phase distribution data generation method of a display according to the third embodiment. Note that, here, a case where the target phase distribution data is generated by using the GS method will be described as an example. However, the method for calculating the phase distribution may be a method other than the GS method. Methods for calculating the phase distribution include, for example, a method of deriving the phase distribution from a diffraction approximation expression of a Fresnel (Fresnel) region or a Fraunhofer (Fraunhofer) region, and a method of deriving the phase distribution as a free-form lens instead of diffraction. The GS method is a method of deriving a phase distribution from a diffraction approximation expression of fraunhofer region. However, the method for calculating the phase distribution according to the present disclosure is not limited thereto.
As shown in fig. 19, the phase distribution operation circuit 51 may generate target phase distribution data by using the GS method as a predetermined phase distribution calculation method.
The phase distribution arithmetic circuit 51 gives a random initial phase as an initial condition to the target reproduction image having the intensity distribution to be reproduced, and performs inverse fourier transform (step S101). The phase distribution operation circuit 51 may replace the phase among the phase and the amplitude obtained by the above operation with a uniform phase (step S102), and may set the replaced phase as the target phase distribution. Since it is assumed that the optical phase modulation device 1 performs reproduction with parallel light, here, the phase is replaced with a uniform phase.
Next, the phase distribution arithmetic circuit 51 performs reproduction calculation by performing fourier transform on the phase and amplitude obtained in step S102 (step S103). By this operation, a reproduced image is calculated.
Next, the phase distribution arithmetic circuit 51 replaces the amplitude among the phase and the amplitude obtained in step S103 with the amplitude of the target reproduced image (step S104).
Next, the phase distribution arithmetic circuit 51 performs inverse fourier transform on the phase and amplitude obtained in step S104 (step S105), and then performs repeated calculation (iteration) for repeatedly performing the calculations in steps S102 to S105. The repeated calculation may be performed until a reproduced image having satisfactory quality as the target reproduced image is obtained.
In the case where the optical phase modulation device 1 attempts to reproduce the same target reproduction image over a plurality of frames or a plurality of sub-frames, the phase distribution arithmetic circuit 51 may vary the phase distribution of the target phase distribution data by varying at least the random initial phase with time in the calculation using the above-described GS method for each frame or each sub-frame (step S201).
Further, in a similar case, the phase distribution operation circuit 51 may change the phase distribution of the target phase distribution data by changing at least the number of times of repeated calculations with time in the calculation using the above-described GS method (step S202).
(second embodiment)
Fig. 20 shows a second example of a target phase distribution data generation method of a display according to the third embodiment. In the second example, the phase distribution operation circuit 51 generates target phase distribution data using a table method.
The phase modulation apparatus may include a memory 71 that stores a plurality of pieces of partial phase distribution data from each of which the same reproduction image can be reproduced. As shown in fig. 20, the memory 71 may store a plurality of pieces of partial phase distribution data as a phase distribution data table.
The phase distribution operation circuit 51 may generate target phase distribution data by combining partial phase distribution data stored in the memory 71. The phase distribution arithmetic circuit 51 may partially vary the phase distribution of the target phase distribution data by randomly varying the combination of the partial phase distribution data pieces with time.
Further, as shown in fig. 20, the phase distribution arithmetic circuit 51 may divide the target reproduction image into a plurality of divided regions, and generate the target phase distribution data by combining partial phase distribution data pieces of each divided region. In this case, for example, when it is assumed that the number of divided regions is N and the number of pieces of partial phase distribution data held as the phase distribution data table is M, M may be performedNA combination of phase distributions. Even if the number M of pieces of partial phase distribution data is small, a substantially random phase distribution as a whole can be generated by increasing the number of divided regions (for example, several thousand).
In the second example described above, it is desirable that the partial phase distribution data stored in the memory 71 have a similar pattern or the same pattern for each wavelength. As a result, since the phase distributions of the respective frames can be made close to each other, the voltage fluctuation is reduced, and the image quality of the reproduced image 60 is improved.
Other configurations, operations, and effects may be substantially similar to those of the optical phase controller and the display according to the first or second embodiment.
<4. other examples >
The technique according to the present disclosure is not limited to the above-described embodiments, and various modifications may be made.
For example, the present technology may have the following configuration.
According to the present technology having the following configuration, a plurality of applied values for each wavelength to be applied to the optical phase modulation device are generated such that the voltage range is different for each wavelength and the minimum value of the voltage range is decreased and the maximum value of the voltage range is increased as the wavelength increases. Therefore, the image quality of the reproduced image produced by the optical phase modulation device can be improved.
(1)
An optical phase controller comprising:
a phase distribution arithmetic circuit that generates a plurality of pieces of phase distribution data for each wavelength corresponding to a reproduced image for each wavelength to be reproduced by the optical phase modulation device; and
a drive circuit that generates a plurality of applied voltages for each wavelength to be applied to the optical phase modulation device based on a plurality of pieces of phase distribution data for each wavelength, and causes the optical phase modulation device to modulate phases of a plurality of lights having different wavelengths and entering in a time division manner for each wavelength in a time division manner,
the drive circuit generates a plurality of applied voltages so that the voltage range is different for each wavelength, and decreases the minimum value of the voltage range and increases the maximum value of the voltage range as the wavelength increases.
(2)
The optical phase controller according to (1), wherein,
the plurality of lights include red light, green light, and blue light,
the plurality of applied voltages include an applied voltage of red, an applied voltage of green, and an applied voltage of blue, and
the drive circuit generates a plurality of applied voltages to allow the following conditions to be satisfied:
Rmin<Gmin<Bmin<Bmax<Gmax<Rmax
wherein
The minimum value of the applied voltage for red is Rmin and the maximum value is Rmax,
the minimum value of the applied voltage of green is Gmin and the maximum value is Gmax, and
the minimum value of the applied voltage for blue is Bmin and the maximum value is Bmax.
(3)
The optical phase controller according to (1) or (2), wherein the drive circuit quantizes the plurality of applied voltages to allow the number of quantization levels of the applied voltage having the longest wavelength to be smaller than the number of quantization levels of the applied voltages having the other wavelengths.
(4)
The optical phase controller according to any one of (1) to (3), wherein the phase distribution arithmetic circuit sequentially generates a plurality of pieces of phase distribution data for each wavelength, and generates the plurality of pieces of phase distribution data so as to minimize a voltage change amount between an applied voltage generated based on the phase distribution data generated one time ago in terms of time and an applied voltage to be generated based on the current phase distribution data.
(5)
The optical phase controller according to (4), wherein the phase distribution arithmetic circuit generates the current phase distribution data with reference to the phase distribution data generated one before in terms of time.
(6)
A display, comprising:
a light source that emits a plurality of lights having different wavelengths in a time-division manner;
an optical phase modulation device that modulates the phases of a plurality of lights from the light source in a time-division manner for each wavelength, and reproduces a plurality of reproduced images in a time-division manner for each wavelength;
a phase distribution arithmetic circuit that generates a plurality of pieces of phase distribution data for each wavelength corresponding to a plurality of reproduction images for each wavelength to be reproduced by the optical phase modulation device; and
a drive circuit that generates a plurality of applied voltages for each wavelength to be applied to the optical phase modulation device based on a plurality of pieces of phase distribution data for each wavelength, and causes the optical phase modulation device to modulate the phases of a plurality of lights in a time-division manner for each wavelength, wherein,
the drive circuit generates a plurality of applied voltages so that the voltage range is different for each wavelength, and decreases the minimum value of the voltage range and increases the maximum value of the voltage range as the wavelength increases.
(7)
The display according to (6), further comprising a light intensity modulation means that performs intensity modulation on the illumination light using the reproduced image produced by the optical phase modulation means as illumination light to generate an image.
This application claims priority based on japanese patent application No. 2018-084690 filed on 26.4.2018 to the present patent office, the entire contents of which are incorporated herein by reference.
It should be understood that various modifications, combinations, sub-combinations, and alterations may occur to others by those skilled in the art based on design requirements and other factors, and that such modifications, combinations, sub-combinations, and alterations are within the scope of the appended claims or their equivalents.
Claims (7)
1. An optical phase controller comprising:
a phase distribution arithmetic circuit that generates a plurality of pieces of phase distribution data for each wavelength corresponding to a reproduced image for each wavelength to be reproduced by the optical phase modulation device; and
a drive circuit that generates a plurality of applied voltages for each wavelength to be applied to the optical phase modulation device based on the plurality of pieces of phase distribution data for each wavelength, and causes the optical phase modulation device to modulate phases of a plurality of lights having different wavelengths and entering in a time division manner for each wavelength in a time division manner,
the drive circuit generates the plurality of applied voltages such that a voltage range is different for each wavelength, and decreases a minimum value of the voltage range and increases a maximum value of the voltage range as the wavelength increases.
2. The optical phase controller of claim 1,
the plurality of lights includes red light, green light, and blue light,
the plurality of applied voltages include an applied voltage of red, an applied voltage of green, and an applied voltage of blue, and
the drive circuit generates the plurality of applied voltages to allow the following conditions to be satisfied:
Rmin<Gmin<Bmin<Bmax<Gmax<Rmax
wherein the content of the first and second substances,
the minimum value of the applied voltage of red is Rmin and the maximum value is Rmax,
the minimum value of the applied voltage of the green color is Gmin and the maximum value is Gmax, and
the minimum value of the applied voltage for the blue color is Bmin and the maximum value is Bmax.
3. The optical phase controller of claim 1, wherein the drive circuit quantizes the plurality of applied voltages to allow a number of quantization levels of applied voltages having a longest wavelength to be less than a number of quantization levels of applied voltages having another wavelength.
4. The optical phase controller according to claim 1, wherein the phase distribution operation circuit sequentially generates the pieces of phase distribution data for each wavelength, and generates the pieces of phase distribution data so as to minimize a voltage change amount between an applied voltage generated based on the phase distribution data generated one before in terms of time and an applied voltage to be generated based on the current phase distribution data.
5. The optical phase controller according to claim 4, wherein the phase distribution operation circuit generates the current phase distribution data with reference to the phase distribution data generated one before in time.
6. A display, comprising:
a light source that emits a plurality of lights having different wavelengths in a time-division manner;
an optical phase modulation device that time-divisionally modulates the phases of the plurality of lights from the light source for each wavelength and time-divisionally reproduces a plurality of reproduction images for each wavelength;
a phase distribution arithmetic circuit that generates a plurality of pieces of phase distribution data for each wavelength corresponding to the plurality of reproduction images for each wavelength to be reproduced by the optical phase modulation device; and
a drive circuit that generates a plurality of applied voltages for each wavelength to be applied to the optical phase modulation device based on the plurality of pieces of phase distribution data for each wavelength, and causes the optical phase modulation device to modulate the phases of the plurality of lights in a time-division manner for each wavelength, wherein,
the drive circuit generates the plurality of applied voltages such that a voltage range is different for each wavelength, and decreases a minimum value of the voltage range and increases a maximum value of the voltage range as the wavelength increases.
7. The display according to claim 6, further comprising a light intensity modulation means that uses the reproduced image produced by the optical phase modulation means as illumination light, performs intensity modulation on the illumination light to generate an image.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
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| JP2018084690 | 2018-04-26 | ||
| JP2018-084690 | 2018-04-26 | ||
| PCT/JP2019/015457 WO2019208205A1 (en) | 2018-04-26 | 2019-04-09 | Optical phase control device and display device |
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| CN112005547A true CN112005547A (en) | 2020-11-27 |
| CN112005547B CN112005547B (en) | 2022-09-13 |
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| WO2023162637A1 (en) * | 2022-02-24 | 2023-08-31 | ソニーグループ株式会社 | Lighting device and projector device |
| WO2023223894A1 (en) * | 2022-05-19 | 2023-11-23 | ソニーグループ株式会社 | Phase modulator |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020033932A1 (en) * | 1998-10-08 | 2002-03-21 | Hideki Yamamoto | Projection-type display device and method of adjustment thereof |
| US6577429B1 (en) * | 2002-01-15 | 2003-06-10 | Eastman Kodak Company | Laser projection display system |
| CN1449505A (en) * | 2000-06-16 | 2003-10-15 | 夏普公司 | Projection type image display device |
| US20070146860A1 (en) * | 2005-12-22 | 2007-06-28 | Nobuhiko Kikuchi | Optical modulation device, optical transmitter, and optical transmission equipment |
| JP2008047829A (en) * | 2006-08-21 | 2008-02-28 | Sony Corp | Light source device and light source control method |
| CN101276125A (en) * | 2007-03-28 | 2008-10-01 | 索尼株式会社 | Laser light generating apparatus |
| US20090015796A1 (en) * | 2007-07-13 | 2009-01-15 | Sanyo Electric Co., Ltd. | Illumination apparatus and projection display apparatus |
| CN101718938A (en) * | 2009-11-13 | 2010-06-02 | 南京大学 | Dispersion control module and wavelength separator |
| CN102207633A (en) * | 2010-03-31 | 2011-10-05 | 日立民用电子株式会社 | Laser projector |
| US20120308240A1 (en) * | 2011-05-30 | 2012-12-06 | Fujitsu Limited | Optical transmitter, control method for the same, and optical transmission system |
| WO2013094011A1 (en) * | 2011-12-20 | 2013-06-27 | Ｎｅｃディスプレイソリューションズ株式会社 | Image projection device and control method for same |
| CN105529608A (en) * | 2016-02-01 | 2016-04-27 | 中国科学院上海光学精密机械研究所 | Frequency conversion device having tunable electric control wavelength |
| WO2017059537A1 (en) * | 2015-10-06 | 2017-04-13 | Mtt Innovation Incorporated | Projection systems and methods |
| US20170180052A1 (en) * | 2015-12-16 | 2017-06-22 | Fujitsu Limited | Transmission device and phase adjustment method |
| US20170316756A1 (en) * | 2016-04-28 | 2017-11-02 | Santec Corporation | Spatial optical modulating system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008145546A (en) * | 2006-12-06 | 2008-06-26 | Olympus Corp | Projection apparatus |
-
2019
- 2019-04-09 CN CN201980026796.9A patent/CN112005547B/en active Active
- 2019-04-09 WO PCT/JP2019/015457 patent/WO2019208205A1/en active Application Filing
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020033932A1 (en) * | 1998-10-08 | 2002-03-21 | Hideki Yamamoto | Projection-type display device and method of adjustment thereof |
| CN1449505A (en) * | 2000-06-16 | 2003-10-15 | 夏普公司 | Projection type image display device |
| US6577429B1 (en) * | 2002-01-15 | 2003-06-10 | Eastman Kodak Company | Laser projection display system |
| US20070146860A1 (en) * | 2005-12-22 | 2007-06-28 | Nobuhiko Kikuchi | Optical modulation device, optical transmitter, and optical transmission equipment |
| JP2008047829A (en) * | 2006-08-21 | 2008-02-28 | Sony Corp | Light source device and light source control method |
| CN101276125A (en) * | 2007-03-28 | 2008-10-01 | 索尼株式会社 | Laser light generating apparatus |
| US20090015796A1 (en) * | 2007-07-13 | 2009-01-15 | Sanyo Electric Co., Ltd. | Illumination apparatus and projection display apparatus |
| CN101718938A (en) * | 2009-11-13 | 2010-06-02 | 南京大学 | Dispersion control module and wavelength separator |
| CN102207633A (en) * | 2010-03-31 | 2011-10-05 | 日立民用电子株式会社 | Laser projector |
| US20120308240A1 (en) * | 2011-05-30 | 2012-12-06 | Fujitsu Limited | Optical transmitter, control method for the same, and optical transmission system |
| WO2013094011A1 (en) * | 2011-12-20 | 2013-06-27 | Ｎｅｃディスプレイソリューションズ株式会社 | Image projection device and control method for same |
| WO2017059537A1 (en) * | 2015-10-06 | 2017-04-13 | Mtt Innovation Incorporated | Projection systems and methods |
| US20170180052A1 (en) * | 2015-12-16 | 2017-06-22 | Fujitsu Limited | Transmission device and phase adjustment method |
| CN105529608A (en) * | 2016-02-01 | 2016-04-27 | 中国科学院上海光学精密机械研究所 | Frequency conversion device having tunable electric control wavelength |
| US20170316756A1 (en) * | 2016-04-28 | 2017-11-02 | Santec Corporation | Spatial optical modulating system |
Non-Patent Citations (1)
| Title |
|---|
| （英）伯恩萨德编；周祚义译: "《航空摄影测量学》", 31 July 1983, 北京：测绘出版社 * |
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