CN111402833A - Correction system for improving phase modulation precision of L CoS spatial light modulator - Google Patents
Correction system for improving phase modulation precision of L CoS spatial light modulator Download PDFInfo
- Publication number
- CN111402833A CN111402833A CN202010502954.8A CN202010502954A CN111402833A CN 111402833 A CN111402833 A CN 111402833A CN 202010502954 A CN202010502954 A CN 202010502954A CN 111402833 A CN111402833 A CN 111402833A
- Authority
- CN
- China
- Prior art keywords
- data
- module
- cos
- phase modulation
- phase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses a correction system for improving the phase modulation precision of an L CoS spatial light modulator, which comprises a measurement module for phase modulation, a micro-control module, a drive module and a L CoS micro-display chip internally provided with a DAC, wherein the drive module comprises a storage control module for preprocessing data cache and improving the frame rate, a signal conversion module for converting an input signal into an internal required format, a register configuration module for configuring corresponding functions of a register, a data fine-tuning control module for realizing the precision improvement of the DAC through different bits and a phase correction module for finishing the phase linear correction.
Description
Technical Field
The invention relates to a correction system for improving the phase modulation precision of an L CoS spatial light modulator, which is used for correcting the phase modulation performance of L CoS, relates to the multi-frame time division improvement of DAC precision to improve the phase modulation precision of L CoS, and is widely applied to the field of integrated circuits and micro display.
Background
With the continuous development of optical interconnection networks, optical information processing must have large capacity and parallelism, and the optical modulation technology of serial input/output such as electro-optical modulators, acousto-optic modulators, waveguide modulators, and the like, has been gradually unable to meet the demand, so spatial optical modulators capable of processing two-dimensional input/output in real time and having an arithmetic function have gained great attention.
The liquid crystal spatial light modulator (L C-S L M) has the advantages of simple driving, low cost, less power consumption and the like, has wide application in the fields of optical tweezers, optical profile measurement, beam shaping, adaptive optics, holographic display and the like, and has increasingly important measurement and analysis on the self characteristics of the liquid crystal spatial light modulator along with the improvement of the requirement on wavefront control precision.
Since the gray scale response curve of the liquid crystal is nonlinear, and the time and space characteristics of the liquid crystal device introduce distortion in the application of the device, obtaining a linear gray scale response curve becomes the key to improve the performance of the device, and therefore, the improvement of the phase modulation precision is of great importance.
Disclosure of Invention
In order to solve the problems, the invention provides a correction system for improving the phase modulation precision of an L CoS spatial light modulator, the DAC precision is improved through multi-frame time division, the phase modulation precision of the spatial light modulator is further improved, and any frame number can be used.
The technical scheme adopted by the invention is as follows:
a correction system for improving the phase modulation precision of an L CoS spatial light modulator is characterized by comprising a micro-control module, a driving module, a phase measurement module and a L CoS micro-display chip, wherein the driving module and the L CoS micro-display chip form the spatial light modulator;
the micro control module is used for sending a test picture and instruction data to the driving module;
the driving module is used for driving and lighting L CoS micro-display chips, and improving the DAC precision of L CoS micro-display chips through time framing adjustment, so that the phase modulation precision of the spatial light modulator is improved;
the phase measurement module is used for measuring the phase information of the picture displayed by the L CoS micro-display chip and feeding back the measured data to the micro-control module.
By utilizing a multi-frame time division principle, the digital DAC precision is improved through time frame division adjustment under the condition of not changing a DAC module, so that the phase modulation precision of the spatial light modulator is improved.
Furthermore, the spatial light modulator consists of a driving module and an L CoS micro-display chip, wherein the driving module is integrated in an independent driving chip or an L CoS micro-display chip, or an FPGA drive replaces the driving module to form the spatial light modulator with a L CoS micro-display chip.
A spatial light modulator is an optical device which adopts L COS (L liquid Crystal On Silicon) chips to adjust the amplitude or phase of light wave front, L COS chips are pixel arrays consisting of liquid Crystal pixels, each pixel can modulate light independently, for the same light, the smaller the size of the pixel is, the finer the modulation is, the higher the resolution of the chip is, the higher the degree of freedom of modulation is, for an ideal phase type spatial light modulator, the phase of light is only changed without affecting the intensity and polarization state of light, and the phase modulation is changed along with the arrangement of the liquid Crystal by changing the voltage.
Further, the spatial light modulator may receive, but is not limited to, RGB data or MIPI-type data.
Further, the DAC module supports, but is not limited to, a resistor string DAC, a voltage switching DAC, a current steering DAC, a switched capacitor DAC or an R-2R DAC and the like to improve the precision, wherein the DAC module can be an L CoS micro-display chip internal DAC or an external DAC module.
Further, the micro control unit supports but is not limited to a CPU, a GPU, a singlechip or a DSP and other control processing units.
Furthermore, the micro control unit can switch to provide a video or picture source to the driving module, record interference fringes fed back from the phase measurement module under a corresponding test picture, obtain a function relation between the gray scale and the phase modulation amount after calculation processing, determine the required gray scale data size when the standard gray scale and the phase linear modulation relation are to be achieved by comparing the standard linear gray scale-phase modulation amount function relation stored in the micro controller and combining a known one-to-one relation curve of the gray scale and the voltage, and transmit a control instruction to the phase correction module of the driving module to correct the gray scale data.
Further, the phase measurement module is used for measuring the spatial light modulator and feeding the obtained interference fringes back to the micro control module until the error of the curve relation between the gray scale and the phase modulation amount is corrected within an allowable range through a control instruction sent to the driving module by the micro control module.
Furthermore, the driving module is used for lighting an L CoS micro-display chip, so that the functions of improving DAC precision and completing linear correction and the like in a time division manner are realized, and the phase modulation performance of the L CoS spatial light modulator is improved.
Furthermore, the driving module, the spatial light modulator, the micro-control module and the phase measurement module, and other modules all perform information interaction in a communication mode, and support but are not limited to various communication modes such as URAT, I2C, SPI, MIPI, and the like.
Furthermore, the driving module can support, but is not limited to, receiving data transmitted by interfaces such as an RGB888 interface, an MIPI interface, an HDMI interface, and a VGA, converting the data into signals required to be used internally by the signal conversion module, and outputting the required data to the storage control module by calculating and selecting the signals.
Furthermore, the storage control module in the driving module adopts an operation mode of storing one frame and taking out multiple frames, and the taken-out data is sequentially sent to the register configuration module.
Furthermore, the data fine-tuning control module in the driving module can convert the data into the actually required corresponding bit width and carry out fine adjustment on the high-order data according to the low-order dataAnd (5) adjusting and calculating. The method can be used for any number of frames, such as 2-frame time division to improve 1-phase modulation precision, 4-frame time division to improve 2-phase modulation precision, 8-frame time division to improve 3-phase modulation precision, and N-frame time division to improve
Phase modulation accuracy.
Furthermore, a data fine-tuning module in the driving module displays single frame data for multiple times as required, when data is fine-tuned, the phase difference of each frame data is fixed, the desired phase modulation precision is obtained by dividing the frame data into different frame numbers, or the phase difference between different frames is adjusted under the condition that the frame numbers are fixed, and finally the desired phase modulation precision is obtained by superposing average time, or the phase difference between the frame numbers and different frames is adjusted at the same time to improve the phase modulation precision, so that new data is obtained and output. Finally, the precision of the DAC is successfully improved under the condition that the DAC module is not changed, so that the phase modulation precision and the linearity are improved.
Furthermore, a register configuration module in the driving module promotes data bit width according to the liquid crystal response characteristic and gray scale phase relation and is used for configuring corresponding functions of the register, and the main configured register functions comprise selection of signal conversion, data storage, linear correction and adjustment functions of whether the data fine adjustment control module is turned on or not.
The invention achieves the following beneficial effects:
according to the invention, the improvement of the DAC precision is realized through multi-frame time division, the phase modulation precision of the spatial light modulator is further improved, any frame number including odd frames can be used, for example, the 1-phase modulation precision is improved through 2-frame time division, the 2-phase modulation precision is improved through 4-frame time division, the 3-phase modulation precision is improved through 8-frame time division, the phase modulation precision is improved through N-frame time division, single-frame data is displayed for multiple times according to needs, data is finely adjusted, and finally, the digital DAC precision is improved through time frame division adjustment under the condition of not changing a DAC module, so that the effect of improving the phase modulation precision of the spatial light modulator through multi-frame time division is realized.
Drawings
FIG. 1 is a block diagram of the overall design of a correction system;
FIG. 2 is a block diagram of a calibration process of the calibration system;
FIG. 3 is a flow chart of improving the modulation accuracy of 1-bit phase by 2-frame time division;
FIG. 4 is a flow chart of improving the modulation precision of 2-phase by 4-frame time division;
fig. 5 is a flow chart of improving the modulation precision of 3-bit phase by 8-frame time division.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The general design block diagram of the correction system is shown in fig. 1, and the correction system for improving the phase modulation precision of the L CoS spatial light modulator comprises a micro control module, a driving module, a phase measurement module and a L CoS micro display chip, wherein the driving module and the L CoS micro display chip form the spatial light modulator.
The micro control module is used for sending test pictures and instruction data to the driving module, the driving module is used for lighting L CoS micro display chips and achieving time framing adjustment to improve the DAC precision of the L CoS micro display chips, the phase measuring module is used for measuring phase information of the pictures displayed by the L CoS micro display chips and feeding the measured data back to the micro control module, the DAC precision improvement is achieved through multi-frame time division, the phase modulation precision of the spatial light modulator is further improved, any frame number including odd frames can be used, single frame data can be displayed for multiple times as required, data are fine adjusted, and finally the digital DAC precision is improved through time framing adjustment under the condition that the DAC module is not changed, so that the effect of improving the phase modulation precision of the spatial light modulator through multi-frame time division is achieved.
A spatial light modulator is an optical device which adopts L COS (L liquid Crystal On Silicon) chips to adjust the amplitude or phase of light wave front, L COS chips are pixel arrays consisting of liquid Crystal pixels, each pixel can modulate light independently, for the same light, the smaller the size of the pixel is, the finer the modulation is, the higher the resolution of the chip is, the higher the degree of freedom of modulation is, for an ideal phase type spatial light modulator, the phase of light is only changed without affecting the intensity and polarization state of light, and the phase modulation is changed along with the arrangement of the liquid Crystal by changing the voltage.
L CoS spatial light modulator, can receive, but is not limited to, RGB data or MIPI type data.
And the precision is improved by supporting DACs such as a resistor string DAC, a voltage switching DAC, a current steering DAC, a switched capacitor DAC, an R-2R DAC and the like, wherein the DAC can be an L CoS micro-display chip internal DAC module or an external DAC module.
The micro-control module supports but is not limited to a CPU, a GPU, a singlechip, a DSP and other control processing units.
The micro control module can switch to provide a video or picture source to the driving module to serve as a test picture, interference fringes fed back from the phase measurement module under the corresponding test picture are recorded, a function relation between the gray scale and the phase modulation amount is obtained after calculation processing, the required gray scale data size is determined by comparing the standard linear gray scale-phase modulation amount function relation stored in the micro control module and adding a known one-to-one corresponding relation curve between the gray scale and the voltage when the standard gray scale and phase linear modulation relation to be achieved is determined, and the required gray scale data size is transmitted to the driving module to correct the gray scale data.
The phase measurement module is used for measuring the L CoS spatial light modulator, obtaining interference fringes through wave front interference of a test picture, and feeding back the interference fringes to the micro control module until the error of the curve relation between the gray scale and the phase modulation amount is corrected within an allowable range through a control command.
The driving module is used for lighting an L CoS micro-display chip, so that the functions of improving DAC precision and completing linear correction and the like in a time division mode are realized, and the phase modulation performance of the L CoS spatial light modulator is improved.
The information interaction between the driving module and the L CoS spatial light modulator and other modules supports, but is not limited to, URAT, I2C, SPI, MIPI and other communication modes.
The driving module can support but is not limited to interfaces such as an RGB888 interface, an MIPI interface, an HDMI interface and a VGA interface, is converted into signals which need to be used inside through the signal conversion module, and outputs required data to a following module through calculation and selection.
The storage control module in the driving module realizes the operation of storing one frame and taking out multiple frames, and the operation is sequentially sent to the register configuration module.
The data fine adjustment control module in the driving module can convert data into corresponding bit width actually needed and make judgment and adjustment, the method can be used for any number of frames, the method comprises the steps of improving the 1-phase modulation precision by 2 frames of time division, improving the 2-phase modulation precision by 4 frames of time division, improving the 3-phase modulation precision by 8 frames of time division, and improving the phase modulation precision by N frames of time division.
And the data fine-tuning control module displays the single frame data for multiple times as required, fine-tunes the data, and obtains and outputs new data through the average effect after time superposition. Finally, the precision of the DAC module is successfully improved under the condition that the resolution of the DAC module is not changed, so that the phase modulation precision and the linearity are improved.
The register configuration module in the driving module promotes the data bit width according to the liquid crystal response characteristic and the gray scale phase relation and is used for configuring the corresponding functions of the register, and the main configured register functions comprise the selection of signal conversion, the register configuration of data storage and linear correction, and the adjustment function of whether the data fine adjustment control module is opened or not.
The correction flow diagram is shown in FIG. 2, firstly, after a correction switch of the micro-control module is turned on, the micro-control module starts to send a tested picture and an operation instruction to the driving module, the driving module improves the DAC precision and lights the L CoS spatial light modulator when finishing time division, the phase linearity is improved after phase correction due to the fact that the DAC precision is improved, the phase modulatable precision is also improved, phase voltage data after correction can be converted into data types which can be identified by a L CoS micro-display chip, and the micro-display can display images.
Furthermore, the measuring module of the phase modulation depth synchronously and continuously acquires information, and feeds the obtained interference fringes back to the micro control module, the micro control module calculates and processes the obtained interference patterns to obtain the size of the phase modulation amount, switches the next test picture and tests the same, and the steps are repeated until all the test pictures are acquired.
And then the micro-control module compares all acquired and processed gray scale and phase modulation amount curve graphs with a standard gray scale-phase modulation amount linear graph, if all phase modulation amount errors are within an allowable range, the verification is directly stopped, otherwise data required to be corrected by a plurality of sets of DAC registers in the L CoS spatial light modulator are obtained, the set of data is sent to the driving module through the micro-control module, and the driving module directly configures the data into a register in a L CoS micro-display chip to finish the accurate correction of the phase modulation capacity corresponding to the primary gray scale point.
After finishing the phase correction once, the micro control unit will continue to resend the test picture data, and repeat the above operations until the curve relationship between the gray scale and the phase modulation amount is within the allowable range.
For source end data such as signals of HDMI and the like in the driving module, the signals are converted into internal required signals such as RGB888 data through the signal conversion module, under the condition that the external is not configured, the default is to adopt 4-frame time division to improve the 2-bit phase modulation precision, the register configuration can also realize the effects of improving the 1-bit phase modulation precision by 2-frame time division, improving the 3-bit phase modulation precision by 8-frame time division, improving the phase modulation precision by N-frame time division and the like, and the flow chart is shown in fig. 3, fig. 4 and fig. 5.
Fig. 3 is a flow chart of implementation steps for improving the modulation precision of 1-bit phase by 2-frame time division, which is briefly described as an example of increasing 8 bits to 9 bits:
firstly, the signal conversion module can convert the signal formats coming from the RGB888 interface, the MIPI interface, the HDMI interface and/or the VGA interface, etc., calculate to obtain the required data, and output one of the data according to the configuration.
In order to improve the precision of the one-bit DAC, the two frames are required to be processed, namely the two frames are increased to the double frame rate, the storage control module stores the single-frame data input by the signal conversion module into the corresponding storage, and when the other frame is stored, the previous stored frame is taken out, the speed of taking out is more than 2 times of the speed of storing, the purpose of storing one frame is achieved, the two frames are taken out, and the frame data is taken out twice to reach the double frame rate.
During the period, the register configuration module performs configuration of relevant registers on the signal conversion module, the data fine adjustment control module and the phase correction module, corrects 8-bit data into 9-bit data according to the liquid crystal response characteristic and the actual gray scale phase relation, and converts the data and sends the data into the data fine adjustment control module.
In order to improve the one-bit phase modulation precision under the condition of not changing the DAC module, that is, the 8-bit data is used for expressing the phase information of the 9-bit data, the data fine tuning control module divides the data into 2 conditions, namely 1 'b 0 and 1' b1 respectively, by judging the specific size of 1bit at the tail of each data in each frame in the same two frames of data from the memory, and further obtains how to fine tune the data.
The specific situation is as follows: after an initial frame of data is divided into two frames of data, the data at a certain position in the initial frame really plays a role of high-order data, and the actual meaning of the data with low 1bit is that the high-order data is divided into two parts again at the minimum voltage (V1) for dividing the DAC output. If the corrected data is 9'd 301, namely 10' b100101101, and the low 1bit is 1 'b 1, only the data of any frame needs to be taken from two frames, the high 9bit is taken, then the high 9bit is added with 1, new 9bit data is output, and the high 9bit of the other frame is output unchanged, so that the average effect of the two frames in time is equivalent to that the voltage is increased by V1/2 on the basis of the original position phase, namely, the numerical information 1' b1 of the low 1bit can be presented, and thus, the linear relation between the voltage and the phase is further improved.
Similarly, when the end 1bit of a certain 9-bit data is 1' b0, the high 9 bits of the two frames of data are output unchanged to represent that the phase is unchanged under the improved precision, that is, the 8-bit data expresses the phase information of the 9-bit data, thereby improving the phase modulation precision of the one-bit spatial light modulator.
Fig. 4 is a flowchart of implementation steps for improving the modulation precision of 2-bit phase by 4-frame time division, which is briefly described as an example of increasing 8 bits to 10 bits:
firstly, the signal conversion module can convert the signal formats coming from the RGB888 interface, the MIPI interface, the HDMI interface, the VGA interface and other interfaces, calculate to obtain the required data, and output one of the data according to the configuration.
In order to improve the precision of the two-bit DAC, four frames are required to be processed, namely, the frame rate is increased to four times, the storage control module stores single-frame data input by the previous module into the corresponding storage, and when another frame is stored, the previous stored frame is taken out, the speed of taking out the previous stored frame is more than 4 times that of storing, so that the frame storing is achieved, four frames are taken out, and the frame data is taken out four times to reach the four times of the frame rate.
During the period, the register configuration module performs configuration of relevant registers on the signal conversion module, the data fine adjustment control module and the phase correction module, corrects 8-bit data into 10-bit data according to the liquid crystal response characteristic and the actual gray scale phase relation, and sends the data into the data fine adjustment control module.
In order to improve the two-bit phase modulation precision under the condition of not changing the DAC module, namely, the phase information of 10-bit data is expressed by 8-bit data, the data fine tuning control module divides the data into 4 cases, namely 2 'b 00, 2' b01,2 'b 10 and 2' b11 respectively, by judging the specific size of two bits at the tail of each data in each frame in the same four-frame data stored in a memory; and from the current few frames, how to fine-tune this data is derived.
The specific situation is as follows: after an initial frame of data is divided into four frames of data, for data at a certain position in the initial frame, it really plays a role of high data (V1), and for data with low 2bit, the practical meaning is that the high data is divided into four parts again at the minimum voltage for dividing the DAC output. If the corrected data is 10'd 301, namely 10' b 0100100101101, and the lower two bits are 2 'b 01, only the data of any one frame needs to be taken from the four frames, the upper 8 bits are taken, then the upper 8 bits are added by 1, new 8-bit data is output, and the other three frames are output unchanged at the upper 8 bits, so that the average effect of the four frames in time is equivalent to that the voltage is increased by V1/4 on the basis of the original position phase, that is, the numerical information 2' b01 of the lower 2 bits can be presented to the user, and the linear relation between the voltage and the phase is further improved.
Similarly, when 2bit at the end of a certain 10bit data is 2' b10, only two frames of data are required to be taken from four frames, the higher 8 bits are added with 1 to output new 8bit data, and the higher 8 bits of the other two frames are output unchanged, so that the phase reaches more ideal precision under the superposition of average time, namely, the 8bit data expresses the phase information of the 10bit data, thereby improving the phase modulation precision of the two-bit spatial light modulator.
Fig. 5 is a flowchart of an implementation step for improving the modulation precision of 3-bit phase by 8-frame time division, which is briefly described as an example of increasing 8 bits to 11 bits:
firstly, the signal conversion module can convert the signal formats coming from the RGB888 interface, the MIPI interface, the HDMI interface, the VGA interface and other interfaces, calculate to obtain the required data, and output one of the data according to the configuration.
In order to improve the precision of the three-bit DAC, eight frames are required to be processed, namely the frame rate is increased to eight times, the storage control module stores single-frame data input by the previous module into the corresponding storage, and when another frame is stored, the previous stored frame is taken out, the speed of taking out is a little more than 8 times of the speed of storing, one frame is stored, eight frames are taken out, and the frame data is taken out eight times to reach the eight times of the frame rate.
During the period, the register configuration module performs configuration of relevant registers on the signal conversion module, the data fine adjustment control module and the phase correction module, corrects 8-bit data into 11-bit data according to the liquid crystal response characteristic and the actual gray scale phase relation, and sends the data into the data fine adjustment control module.
In order to improve the three-bit phase modulation precision without changing the DAC module, that is, the 8-bit data is used to express the phase information of the 11-bit data, the data fine tuning control module divides the data into eight cases, namely 3 'b 000, 3' b001,3 'b 010, 3' b011, 3 'b 100, 3' b101,3 'b 110 and 3' b111, by determining the specific size of the last three bits of each data in each frame in the same eight frame data stored in the memory, so as to obtain how to fine tune the data.
The specific situation is as follows: after an initial frame of data is divided into eight frames of data, for data at a certain position in the initial frame, it really plays a role of high-order data, and for data with low 3bit, the practical meaning is that the high-order data is divided into eight parts again at the minimum voltage (V1) for dividing the DAC output. If the corrected data is 11'd 301, namely 11' b00100101101, and the lower three bits are 3 'b 101, only five frames of data need to be selected from eight frames, the upper 8 bits are selected, then the upper 8 bits are added by 1, new 8bit data is output, and the other three frames are output unchanged at the upper 7 bits, so that the average effect of the eight frames in time is equivalent to that the voltage is increased by 5V1/8 on the basis of the original position phase, that is, the numerical information 3' b101 of the lower 3 bits can be reflected, and the linear relation between the voltage and the phase is further improved.
Similarly, when 3bit at the end of 11bit data is 3' b110, only six frames of data are arbitrarily selected from eight frames, 8 high bits are selected, 1 is added to 8 high bits, new 8bit data are output, and the remaining two frames of 8 high bits are output unchanged, so that the phase reaches more ideal precision under the superposition of average time, namely the 8bit data expresses the phase information of the 11bit data, and the phase modulation precision of the three-bit spatial light modulator is improved.
In this way, a specific embodiment of N frame time division can be obtained, and as above, a specific implementation case of implementing phase modulation accuracy improvement by multi-frame time division can be similarly applicable to more different actual requirements, and any number of frames can be used to improve phase modulation accuracy by the present invention. By means of the framing and time division display of any scheme, the accuracy of the digital DAC and the phase modulation is improved through time framing adjustment under the condition that a DAC module is not changed, and therefore the effect that the phase modulation accuracy of the spatial light modulator is improved through multi-frame time division is achieved.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (12)
1. A correction system for improving the phase modulation precision of an L CoS spatial light modulator is characterized by comprising a micro-control module, a driving module, a phase measurement module and a L CoS micro-display chip, wherein the driving module and the L CoS micro-display chip form the spatial light modulator;
the micro control module is used for sending a test picture and instruction data to the driving module;
the driving module is used for driving and lighting L CoS micro-display chips, and improving the DAC precision of L CoS micro-display chips through time framing adjustment, so that the phase modulation precision of the spatial light modulator is improved;
the phase measurement module is used for measuring the phase information of the picture displayed by the L CoS micro-display chip and feeding back the measured data to the micro-control module.
2. The calibration system for improving the phase modulation accuracy of L CoS spatial light modulator according to claim 1, wherein the driving module is integrated inside a separate driving chip, or integrated inside a L CoS micro-display chip, or FPGA driving is used to replace the driving module and L CoS micro-display chip to form the spatial light modulator.
3. The correction system for improving the phase modulation accuracy of the L CoS spatial light modulator according to claim 1, wherein a DAC module is arranged inside or outside the L CoS micro-display chip, and the DAC module is a resistor string DAC, a voltage switching DAC, a current steering DAC, a switch capacitor DAC or an R-2R DAC.
4. The correction system for improving the phase modulation accuracy of an L CoS spatial light modulator according to claim 1, wherein the micro control module is a CPU, a GPU, a single chip or a DSP.
5. The correction system for improving the phase modulation precision of the L CoS spatial light modulator according to claim 1, wherein the micro control module is capable of switching to provide a video or picture source to the driving module, recording interference fringes fed back by the phase measurement module under a corresponding test picture, calculating to obtain a functional relationship between gray scale and phase modulation amount, determining the gray scale size required when the standard gray scale and phase linear modulation relationship is reached by comparing the stored functional relationship between the standard linear gray scale and the phase modulation amount and combining a known curve of one-to-one correspondence between gray scale and voltage, and transmitting a control command to the phase correction module of the driving module to correct the gray scale.
6. The calibration system according to claim 4 for improving the phase modulation accuracy of L CoS spatial light modulator, wherein the phase measurement module measures the spatial light modulator and feeds back the interference fringes to the micro control module until the error of the curve relationship between gray scale and phase modulation amount is corrected within an allowable range by the control command sent by the micro control module to the driving module.
7. The calibration system for improving the phase modulation accuracy of an L CoS spatial light modulator according to claim 1, wherein the driving module communicates with the spatial light modulator, the micro-control module, and the micro-control module communicates with the phase measurement module.
8. The calibration system for improving the phase modulation accuracy of L CoS spatial light modulator according to claim 1, wherein the driving module receives the data transmitted from RGB888 interface, MIPI interface, HDMI interface and VGA interface, converts the data into the signals required to be used internally by the signal conversion module, and outputs the required data to the memory control module by calculation.
9. The calibration system according to claim 1 for improving the phase modulation accuracy of L CoS spatial light modulator, wherein the storage control module in the driving module stores one frame and extracts multiple frames, and sequentially sends the extracted data to the register allocation module.
10. The calibration system for improving the phase modulation accuracy of L CoS spatial light modulator according to claim 1, wherein the data fine tuning control module in the driving module converts the data into the corresponding bit width actually needed and performs fine tuning calculation on the high-order data according to the low-order data.
11. The system of claim 10 wherein the data fine-tuning control module in the driving module displays a single frame of data as many times as necessary, and when fine-tuning the data, the data fine-tuning control module fixes the phase difference of each frame of data, and obtains the desired phase modulation accuracy by dividing the data into different frames, or adjusts the phase difference between different frames if the number of frames is fixed, and finally obtains the desired phase modulation accuracy by superimposing the average time, or simultaneously adjusts the phase difference between the number of frames and different frames to improve the phase modulation accuracy, and obtains and outputs new data.
12. The calibration system according to claim 1 for improving the phase modulation accuracy of L CoS spatial light modulator, wherein the register configuration module in the driving module is configured to increase the data bit width according to the liquid crystal response characteristic and gray scale phase relationship, and the configured register functions include signal conversion selection, data storage, linear calibration and adjustment function for turning on or off the data fine tuning control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010502954.8A CN111402833B (en) | 2020-06-05 | 2020-06-05 | Correction system for improving phase modulation precision of LCoS spatial light modulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010502954.8A CN111402833B (en) | 2020-06-05 | 2020-06-05 | Correction system for improving phase modulation precision of LCoS spatial light modulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111402833A true CN111402833A (en) | 2020-07-10 |
| CN111402833B CN111402833B (en) | 2020-09-01 |
Family
ID=71414053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010502954.8A Active CN111402833B (en) | 2020-06-05 | 2020-06-05 | Correction system for improving phase modulation precision of LCoS spatial light modulator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111402833B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112116887A (en) * | 2020-11-23 | 2020-12-22 | 南京芯视元电子有限公司 | Display chip flatness correction system of LCoS spatial light modulator |
| CN113409719A (en) * | 2021-08-19 | 2021-09-17 | 南京芯视元电子有限公司 | Video source display method, system, micro display chip and storage medium |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1041685C (en) * | 1993-07-19 | 1999-01-13 | 德克萨斯仪器股份有限公司 | Color phase control for projection display using spatial light modulator |
| CN101226292A (en) * | 2007-01-19 | 2008-07-23 | 滨松光子学株式会社 | Phase-modulating apparatus |
| FR2955964A1 (en) * | 2010-02-02 | 2011-08-05 | Commissariat Energie Atomique | IMAGE WRITING METHOD IN A LIQUID CRYSTAL DISPLAY |
| CN103069806A (en) * | 2010-08-12 | 2013-04-24 | 伊斯曼柯达公司 | Light source modulation for projection |
| US20150177502A1 (en) * | 2013-12-24 | 2015-06-25 | Olympus Corporation | Photo-stimulator and microscope system |
| US20170004624A1 (en) * | 2015-07-02 | 2017-01-05 | Pixart Imaging Inc. | Distance measurement device base on phase difference and distance measurement method thereof |
| US20190053013A1 (en) * | 2014-08-01 | 2019-02-14 | Polte Corporation | Network architecture and methods for location services |
| CN110855960A (en) * | 2018-08-20 | 2020-02-28 | 深圳光峰科技股份有限公司 | Display device, display system and display method |
-
2020
- 2020-06-05 CN CN202010502954.8A patent/CN111402833B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1041685C (en) * | 1993-07-19 | 1999-01-13 | 德克萨斯仪器股份有限公司 | Color phase control for projection display using spatial light modulator |
| CN101226292A (en) * | 2007-01-19 | 2008-07-23 | 滨松光子学株式会社 | Phase-modulating apparatus |
| FR2955964A1 (en) * | 2010-02-02 | 2011-08-05 | Commissariat Energie Atomique | IMAGE WRITING METHOD IN A LIQUID CRYSTAL DISPLAY |
| CN103069806A (en) * | 2010-08-12 | 2013-04-24 | 伊斯曼柯达公司 | Light source modulation for projection |
| US20150177502A1 (en) * | 2013-12-24 | 2015-06-25 | Olympus Corporation | Photo-stimulator and microscope system |
| US20190053013A1 (en) * | 2014-08-01 | 2019-02-14 | Polte Corporation | Network architecture and methods for location services |
| US20170004624A1 (en) * | 2015-07-02 | 2017-01-05 | Pixart Imaging Inc. | Distance measurement device base on phase difference and distance measurement method thereof |
| CN110855960A (en) * | 2018-08-20 | 2020-02-28 | 深圳光峰科技股份有限公司 | Display device, display system and display method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112116887A (en) * | 2020-11-23 | 2020-12-22 | 南京芯视元电子有限公司 | Display chip flatness correction system of LCoS spatial light modulator |
| CN112116887B (en) * | 2020-11-23 | 2021-03-16 | 南京芯视元电子有限公司 | Display chip flatness correction system of LCoS spatial light modulator |
| CN113409719A (en) * | 2021-08-19 | 2021-09-17 | 南京芯视元电子有限公司 | Video source display method, system, micro display chip and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111402833B (en) | 2020-09-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5228278B2 (en) | Image display control apparatus and method | |
| TWI398837B (en) | A display having backlight modulation, a method for configuring the display and a convertor for converting an input signal for the display | |
| CN111402833B (en) | Correction system for improving phase modulation precision of LCoS spatial light modulator | |
| CN101764924B (en) | Method and apparatus for processing video data of liquid crystal display device | |
| CN101667397B (en) | Liquid crystal display device and method for driving the same | |
| KR20050123158A (en) | Liquid crystal display gamma correction | |
| JP6750210B2 (en) | Display signal processing system, processing device, display signal generating device, processing method, and display signal generating method | |
| JP2008203826A (en) | Source driver, electro-optical device, and electronic instrument | |
| WO2015007084A1 (en) | Grey-scale adjustment voltage generating method and device, and panel drive circuit | |
| CN100356257C (en) | Liquid crystal display device | |
| KR101147121B1 (en) | Apparatus and method for transmission data, apparatus and method for driving image display device using the same | |
| CN111627403B (en) | Automatic phase linearity correction system of LCoS spatial light modulator | |
| KR101872944B1 (en) | Method of driving display panel and display apparatus for performing the method | |
| CN1997164A (en) | Data converting circuit and display apparatus using the same | |
| CN103903545A (en) | Driving circuit of display device and method for driving the same | |
| US20080024525A1 (en) | Display panel driving device and driving method thereof | |
| CN107305309B (en) | Method and apparatus for diffraction artifact reduction in image display systems | |
| JP2002123221A (en) | Display device, projection type display device, driving device for light modulator and driving method for light modulator | |
| KR20020093814A (en) | Frame prewriting in a liquid crystal display | |
| CN111402780B (en) | Display system for improving DAC precision inside micro-display through time division display | |
| CN100401743C (en) | Method for decreasing LCD display distortion | |
| US8159509B2 (en) | Color display device and method for reproducing color with an increased number of gradation levels | |
| CN116092406A (en) | Gamma voltage curve adjusting method and equipment | |
| CN104103252A (en) | Gamma voltage generating device, grayscale voltage generating device and display device | |
| KR101394433B1 (en) | Signal processor, liquid crystal display comprising the same and driving method of liquid crystal display |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |