CN112116887B - Display chip flatness correction system of LCoS spatial light modulator - Google Patents
Display chip flatness correction system of LCoS spatial light modulator Download PDFInfo
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Abstract
The invention discloses a display chip flatness correction system of an LCoS spatial light modulator, which comprises a phase modulation measurement module, a micro control module, a driving module and an LCoS micro display chip module, wherein the driving module comprises a signal receiving and converting module for converting an input signal into an internal required format, a storage control module for preprocessing data cache, a register configuration module for configuring corresponding functions of a register and a phase correction module for finishing phase correction; according to the method, the phase correction value of each preset pixel point in the LCoS display image is obtained through measurement and operation, and the phase correction values of all the pixel points in the LCoS micro-display chip module are obtained through data fitting processing, so that the display chip flatness correction of the LCoS spatial light modulator is realized, and the method is suitable for scenes with high requirements on the display chip flatness.
Description
Technical Field
The invention relates to the field of integrated circuits and the technical field of micro display, in particular to a display chip flatness correction system of an LCoS spatial light modulator.
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.
A Spatial Light Modulator (SLM), which is different from the one-dimensional light modulator described above, is an element that loads information onto a one-dimensional or two-dimensional optical data field and can modulate the light wave distribution with a time-varying drive signal. The developed liquid crystal spatial light modulator (LC-SLM) has the advantages of simple driving, low cost, low power consumption and the like because the liquid crystal material can introduce controllable phase delay and change polarization state of the incident light, and has wide application in the fields of optical tweezers, optical profile measurement, beam shaping, adaptive optics, holographic display and the like. With the improvement of the requirement on the accuracy of wavefront control, the measurement and analysis of the characteristics of the liquid crystal spatial light modulator become increasingly important.
Since the curvature of the surface of the chip is different from that of the surface of the ITO glass, the liquid crystal filled between the chip and the ITO glass is uneven, the phase information of the spatial light modulator is sensitive to the uneven liquid crystal, and a phase response curve within a reasonable error range can be obtained to become a key for improving the performance of the liquid crystal, so that the correction of the flatness is of great importance.
The traditional flatness correction method needs to analyze and measure the curvature characteristics of liquid crystal distribution in a chip, a special test instrument is adopted to test the correction data of all pixel points on the whole screen, then correction calculation is carried out at a data source head in a software or hardware mode, and the corrected data is output to a rear-end LCoS spatial light modulator. The method has the advantages that the test points are rich, all pixel points needing to be corrected are covered, but the defects are obvious, firstly, a special instrument is needed, the test process is complex, the test period is long, and the use is limited; secondly, each LCoS spatial light modulator is not consistent, and the testing task is heavy; and thirdly, the LCoS can also introduce secondary deformation due to mechanical external force and other reasons in the using process, the corrected data needs to be readjusted, and the defects I and II are more obvious.
Disclosure of Invention
The purpose of the invention is as follows: the display chip flatness correction system of the LCoS spatial light modulator is simple in test process and short in test period.
The technical scheme is as follows: the system provided by the invention is used for correcting the display of the LCoS micro-display chip module in the target LCoS spatial light modulator, the target LCoS spatial light modulator consists of a driving module and the LCoS micro-display chip module, and the correcting system comprises a micro-control module, a driving module, a phase modulation measuring module and the LCoS micro-display chip module;
the phase modulation measurement module is used for measuring the phase information of each preset correction reference point in the LCoS micro-display chip module when the LCoS micro-display chip module displays each test picture, further acquiring the phase response curve data corresponding to each correction reference point, and feeding back the phase response curve data of each correction reference point to the micro-control module;
the micro-control module is used for acquiring the phase correction value of each correction reference point according to the phase response curve data of each correction reference point and sending the phase correction value of each correction reference point to the driving module;
and the driving module is used for fitting the phase correction value of each correction reference point by combining the row and column positions of each correction reference point in the LCoS micro-display chip module according to the phase correction value of each correction reference point, further acquiring the phase correction value of each pixel point in the LCoS micro-display chip module, and correcting the phase of the corresponding pixel point according to the acquired phase correction value.
As a preferable aspect of the present invention, a method of fitting a phase correction amount of each correction reference point includes: piecewise linear difference method, cubic spline difference method, linear fitting method, linear piecewise fitting method, trigonometric function fitting method.
As a preferred scheme of the present invention, the driving module includes a register configuration module; the register configuration module is used for data storage, selecting whether the phase correction function is turned on or not, and selecting a data fitting method.
As a preferred scheme of the present invention, the driving module is integrated inside an independent driving chip, or integrated inside an LCoS micro-display chip module, or an FPGA driver is used to replace the driving module and the LCoS micro-display chip module to form an LCoS spatial light modulator.
As a preferred solution of the present invention, the driving module includes a phase correction module, and the phase correction module is integrated inside the driving module, or integrated inside the LCoS micro-display chip module, or integrated inside the FPGA.
As a preferred scheme of the invention, the micro-control module adopts a CPU, a GPU, an MCU or a DSP.
As a preferred aspect of the present invention, the micro control module is configured to randomly select one of the phase response curves corresponding to the calibration reference points as a reference phase reference curve, compare each phase value in the phase response curve of each calibration reference point with a phase value at a corresponding position in the reference phase reference curve, and obtain the phase correction amount of each calibration reference point.
As a preferred aspect of the present invention, the phase modulation measurement module is configured to measure each test picture, send the acquired phase response curve data of each calibration reference point to the micro control module, until the micro control module sends a control instruction to the driving module to correct the difference between each phase value in the phase response curve of each calibration reference point and the phase value at the corresponding position in the reference phase reference curve to an allowable error range.
As a preferred scheme of the invention, the driving module, the LCoS micro-display chip module, the micro-control module and the phase modulation measurement module are communicated with each other in a communication mode, wherein the communication mode comprises URAT communication, I2C communication, SPI communication and MIPI communication.
As a preferred scheme of the invention, the driving module comprises a signal receiving and converting module and a storage control module;
the driving module receives data transmitted by the RGB888 interface, the MIPI interface, the HDMI interface or the VGA interface, converts the data into signals which can be identified by the LCoS micro-display chip module through the signal receiving and converting module, and outputs the required data to the storage control module through calculation and selection.
As a preferred aspect of the present invention, the phase modulation measurement module includes a phase measurement system for measuring a phase of a calibration reference point in the display chip;
the phase measurement system includes: the device comprises a light source, a polarizer polaroid, a beam splitter prism, a wave plate, an analyzer and an optical power meter;
the light-emitting end of the light source faces one side surface of the polarizer polaroid, a light beam emitted by the light source is vertical to the plane of the polarizer polaroid, the other side surface of the polarizer polaroid faces the beam splitting prism, and the light beam passing through the polarizer polaroid and a coating layer in the beam splitting prism form an included angle of 45 degrees;
the LCoS micro-display chip module and the wave plate are respectively arranged on two sides of the right-angle beam splitter prism, the working end of the LCoS micro-display chip module is opposite to one side surface of the wave plate, the other side surface of the wave plate is opposite to one side surface of the analyzer, and the other side surface of the analyzer faces to a light beam sampling end of the optical power meter;
the light beam emitted by the light source is incident to the coating surface of the beam splitter prism after passing through the polarizer polaroid, the light beam reflected by the coating surface is incident to the correction reference point in the LCoS micro-display chip module, and the light beam reflected by the LCoS micro-display chip module sequentially passes through the polarization surfaces of the beam splitter prism, the wave plate and the analyzer and then is incident to the light beam sampling end of the optical power meter.
Has the advantages that: compared with the prior art, the display chip flatness correction system of the LCoS spatial light modulator provided by the invention has the advantages that the phase modulation measurement module measures the phase of each preset correction reference point and sends the measurement data to the micro-processing module, the micro-processing module obtains the phase correction value of each correction reference point according to the data and sends the phase correction value to the driving module, and the driving module fits the received data to obtain the phase correction value of each pixel point in the LCoS micro-display chip module so as to correct the phase of each pixel point; in the testing process, the phase of each preset correction reference point is only tested, the phase of each pixel point in the LCoS micro-display chip module is not required to be tested, the testing process is simple, the testing period is short, and the number of the tested reference points can be flexibly configured.
Drawings
FIG. 1 is a block diagram of a system provided in accordance with an embodiment of the present invention;
FIG. 2 is a block flow diagram of a correction system correction provided in accordance with an embodiment of the present invention;
FIG. 3 is a flow chart of a wave plate compensation method provided in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of the positions of the calibration reference points in the display chip according to the embodiment of the invention.
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.
In the description of the present invention, the terms "left", "right", "upper", "lower", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and do not require that the present invention must be patterned and operated in a specific orientation, and thus, are not to be construed as limiting the present invention.
The display chip flatness correction system of the LCoS spatial light modulator is used for correcting the display of an LCoS micro-display chip module in a target LCoS spatial light modulator, and referring to fig. 1, the display chip flatness correction system of the LCoS spatial light modulator comprises a micro-control module, a driving module, a phase modulation measuring module and an LCoS micro-display chip module.
The target LCoS spatial light modulator consists of a driving module and an LCoS micro-display chip module;
the phase modulation measurement module is used for measuring the phase information of each preset correction reference point in the LCoS micro-display chip module when the LCoS micro-display chip module displays each test picture, further acquiring the phase response curve data corresponding to each correction reference point, and feeding back the phase response curve data of each correction reference point to the micro-control module; the preset correction reference points are selected from all pixel points in the LCoS display chip according to preset positions, and the number of the preset correction reference points does not exceed the resolution of the LCoS display chip of the target LCoS spatial light modulator. And the micro control module is used for acquiring the phase correction amount of each correction reference point according to the phase response curve data of each correction reference point and sending the phase correction amount and the instruction data of each correction reference point to the driving module.
And the driving module is used for driving the LCoS micro-display chip module to be lightened, and is also used for acquiring the phase correction value of each pixel point in the LCoS micro-display chip module according to the phase correction value of each correction reference point, and correcting the phase of the corresponding pixel point according to the acquired phase correction value.
The LCoS spatial light modulator can receive, but is not limited to, RGB data, MIPI type data.
The phase modulation measurement module is used for measuring each test picture, sending the acquired phase response curve data of each correction reference point to the micro control module until the micro control module sends a control instruction to the driving module to correct the difference value of each phase value in the phase response curve of each correction reference point and the phase of the corresponding position in the reference phase reference curve to be within an allowable error range; and if all the phase difference values are within the allowed error range, directly stopping correction, otherwise, after finishing the phase correction for one time, retransmitting the test picture data by the micro-control module, and repeating the correction process until all the phase difference values are within the allowed error range.
The phase modulation measurement module can support but is not limited to a wave plate compensation method to carry out phase test on all correction reference points in the LCoS micro-display chip module, and comprises a phase measurement system for measuring the phase of the correction reference points in the display chip;
referring to fig. 2, the phase measurement system includes: the device comprises a light source, a polarizer polaroid, a beam splitter prism, a wave plate, an analyzer and an optical power meter.
The light-emitting end of the light source faces one side surface of the polarizer polaroid, a light beam emitted by the light source is vertical to the plane of the polarizer polaroid, the other side surface of the polarizer polaroid faces the beam splitting prism, and the light beam passing through the polarizer polaroid and a coating layer in the beam splitting prism form an included angle of 45 degrees;
the LCoS micro-display chip module and the wave plate are respectively arranged on two sides of the right-angle beam splitter prism, the light emitting surface of the LCoS micro-display chip module is opposite to one side surface of the wave plate, the other side surface of the wave plate is opposite to one side surface of the analyzer, and the other side surface of the analyzer faces to a light beam sampling end of the optical power meter;
the light beam emitted by the light source is incident to the coating surface of the beam splitter prism after passing through the polarizer polaroid, the light beam reflected by the coating surface is vertically incident to the correction reference point in the LCoS micro-display chip module, and the light beam reflected by the LCoS micro-display chip module sequentially passes through the coating surface of the beam splitter prism, the wave plate and the polarization surface of the analyzer and then is incident to the light beam sampling end of the optical power meter.
In this embodiment, the light source is a laser, the polarized light beam output by the laser is filtered by a polarizer, and further polarized light with good polarization is obtained, the polarized light is split by a splitting prism and is changed into two beams, one beam of light is reflected by the splitting prism at 45 degrees, the other beam of light is directly projected to pass through the splitting prism, the beam reflected by the splitting prism reaches a pixel point selected as a correction reference point in the LCoS micro-display chip module, is modulated and reflected to the splitting prism by the LCoS micro-display chip module, then passes through a wave plate and an analyzer, and finally reaches the optical power meter. In the process of measuring the phase, the polarization state of the light beam incident on the analyzer is orthogonal to the polarization direction of the analyzer by rotating the analyzer, so that the system reaches an extinction state, and the phase response curve of the pixel point in the LCoS micro-display chip module is calculated.
When phase response curves of other correction reference points are measured, the LCoS spatial light modulator is kept fixed, light beams emitted by the phase detection device are made to be incident to the correction reference points on the LCoS display chip, which need to be subjected to phase test, by translating the phase detection device, and the phase response curves of the correction reference points can be tested according to the method.
Referring to fig. 3, when correcting, firstly, the micro control module is opened, the micro control module starts to send a test picture and an operation instruction for starting to perform phase correction to the driving module, the driving module converts input data into a data type which can be identified by the LCoS micro display chip module through the signal receiving conversion module, and the LCoS micro display chip module is lightened to enable the LCoS micro display chip module to display an image. The test picture can be input through a data source or can be prestored in the display chip. The phase correction module obtains the phase difference of each pixel point in the LCoS micro display chip module by fitting the phase difference value of each correction reference point, corrects the phase value of the corresponding pixel point in the picture to be displayed according to the obtained phase difference of each pixel point to obtain the phase value of each pixel point finally used for lightening the LCoS micro display chip module, and the phase modulation measurement module measures each correction reference point in the LCoS micro display chip module to obtain the phase value of each correction reference point and sends the phase value to the micro control module.
The wave plate compensation method is to compensate the phase delay of the light generated by the LCoS micro-display chip module to be detected to be 0 or pi according to a phase compensator, namely: the polarized light of the LCoS micro-display chip module at the reflection position is compensated into linearly polarized light, and then the purpose of measuring the LCoS phase is achieved through the polarized light state emitted by the detection system. The method can measure the phase response curve of a single pixel point, and the phase response curve of NxM pixel points of the LCoS chip can be measured by translating the test system.
The micro-control module adopts a CPU, a GPU, an MCU or a DSP.
And the micro control module is used for randomly selecting one phase response curve corresponding to each correction reference point as a reference phase reference curve, comparing each phase value in the phase response curve of each correction reference point with the phase value of the corresponding position in the reference phase reference curve, and acquiring the phase correction amount of each correction reference point. The driving module is integrated inside an independent driving chip or an LCoS micro-display chip module, or an FPGA drive replaces the driving module to form an LCoS spatial light modulator with the LCoS micro-display chip module.
The driving module comprises a signal receiving and converting module, a storage control module, a phase correcting module and a register configuration module.
The phase correction module is integrated inside the driving module, or integrated inside the LCoS micro-display chip module, or integrated inside the FPGA.
The register configuration module is used for data storage, whether the phase correction function is turned on or not and selection of a data fitting method.
The driving module is used for fitting the phase correction value of each correction reference point by combining the position of each correction reference point in the LCoS micro-display chip module to obtain the phase correction value of each pixel point in the LCoS micro-display chip module.
The driving module receives data transmitted by the RGB888 interface, the MIPI interface, the HDMI interface or the VGA interface, converts the data into signals which can be identified by the LCoS micro-display chip module through the signal receiving and converting module, and outputs the required data to the storage control module through calculation and selection. The driving module, the spatial light modulator, the micro control module and the phase modulation measuring module are communicated with each other in a communication mode, and communication modes such as URAT, I2C, SPI and MIPI are supported but not limited.
The method for fitting the phase correction amount of each correction reference point comprises the following steps: piecewise linear difference method, cubic spline difference method, linear fitting method, linear piecewise fitting method, trigonometric function fitting method.
The driving module is used for driving the LCoS micro-display chip module to be lightened, and phase correction values of all pixel points in the LCoS micro-display chip module are obtained through fitting of the phase correction module. When the spatial light modulator displays pictures, the phase correction module calculates the phase correction value of each pixel point and data input by the data source to obtain data finally used for lightening the LCoS micro-display chip module, and further the flatness of a display chip of the LCoS spatial light modulator is improved.
The driving module and the LCoS micro-display chip module support, but are not limited to 1920x1080, 1280x1024, 1280x 720.
The micro control module records phase information fed back by the phase modulation measurement module under the corresponding test picture, selects one phase response curve with the same number as the preset correction reference points as a reference phase reference curve, obtains the average value of phase differences in the same phase response curve by using the difference value between each phase value in the phase response curve of each correction reference point and the phase value at the corresponding position in the reference phase reference curve, defines the average value as the phase correction value of the correction reference point corresponding to the phase response curve, and sends the phase correction value to the phase correction module in the driving module for data fitting processing.
Taking a linear piecewise fitting method as an example, aiming at an LCoS micro-display chip module with the resolution of J × I, wherein the LCoS micro-display chip module comprises I rows and J rows of pixel points, and instructions specifically executed by each module in the correction system are as follows:
the driving module is used for lightening the display chip according to each test picture;
the phase modulation measurement module is used for selecting N pixel points M on the LCoS micro display chip module as each correction reference point k in the correction reference points, wherein k is more than or equal to 4 and less than or equal to M N, and executing the following instructions:
randomly sequencing the test pictures to acquire a phase value of a correction reference point k when the LCoS micro-display chip module displays the test pictures; constructing a corresponding curve of the phase of the correction reference point k according to the serial number of each test picture and the phase value of the correction reference point k corresponding to each test picture;
the micro-control module is used for randomly selecting one of the phase response curves of the correction datum points as a reference datum curve and executing the following operations aiming at the correction datum points k:
acquiring the maximum value of the phase difference of the correction reference point k relative to the corresponding pixel point in the reference curve according to the phase response curve of the correction reference point k and the reference curve;
judging whether the maximum values of the phase differences of the N × M correction reference points relative to the pixel points corresponding to the reference curve are all smaller than or equal to a preset phase difference threshold value, if so, executing the following instruction; if not, the driving module executes the instruction of lightening the LCoS micro-display chip module according to each test picture again;
for each correction reference point k: acquiring the average value of the phase difference of the pixel points corresponding to the reference datum curve according to the phase response curve and the reference datum curve of the correction datum point k, and defining the average value as the phase correction value of the correction datum point k;
and the driving module is further used for fitting the acquired phase correction values of the N x M correction reference points according to a piecewise linear fitting method, acquiring the phase correction values of all pixel points in the LCoS micro-display chip module, and correcting the phase of the corresponding pixel point according to the acquired phase correction values.
The N × M correction reference points include:
n correction reference points located on the 1 st line: pixel points (1, 1) of the 1 st line and the 1 st column in the 1 st line, pixel points (J, 1) of the 1 st line and the J-th column in the 1 st line, and N-2 pixel points between the pixel points (1, 1) and the pixel points (J, 1);
m correction reference points on column 1: pixel points (1, 1) of a 1 st line and a 1 st column in a 1 st line, pixel points (1, I) of a 1 st line and a 1 st column in an I st line, and M-2 pixel points positioned between the pixel points (1, 1) and the pixel points (1, I);
the pixel points corresponding to the intersection points of N-2 straight lines passing through N-2 pixel points between the pixel points (1, 1) and the pixel points (J, 1) respectively and along the longitudinal arrangement direction of the pixel points and M-2 straight lines passing through M-2 pixel points between the pixel points (1, 1) and the pixel points (1, I) respectively and along the transverse arrangement direction of the pixel points.
In one embodiment, the phase correction module is configured to obtain phase correction values of all pixel points in the LCoS microdisplay chip module by executing the following instructions:
j is more than or equal to 1 and less than or equal to J, I is more than or equal to 1 and less than or equal to I, and J and I respectively represent the column number and the row number of the pixel points in the LCoS micro-display chip module; the following operations are performed:
according to four correction reference points p around the distributed pixel points pixel (j, i)n，m、pn+1，m、pn，m+1、Pn+1，m+1The phase correction values N and M respectively represent the column number and the row number of correction reference points in the LCoS micro-display chip module, M +1 is more than or equal to 1 and less than or equal to M, N +1 is more than or equal to 1 and less than or equal to N, and pixel points (j ', i'), pixel (j ', i'), pixel (j ', i') and pixel (j ', i') corresponding to the four correction reference points respectively represent the column number and the row number of the pixel points in the LCoS micro-display chip module, and the following steps are executed:
combining with the correction reference points pn，mAnd a correction reference point pn，m+1The number of rows of the corresponding pixel points, and a correction reference point pn，mAnd a correction reference point pn，m+1Obtaining the phase correction value Y of the pixel point between the pixel points (j ', i') and (j ', i')Line ofPhase correction amount expression with respect to the number of lines:
Yline of＝aLine ofi+bLine of
Wherein, aLine of、bLine ofAre respectively a constant;
according to the phase correction value Y of the pixel point between the pixel points (j ', i') and (j ', i')Line ofAcquiring a first phase correction value Y of pixel (j', i) of a pixel point by using a phase correction value expression about line numberLine of；
Combining with the correction reference points pn+1，mAnd a correction reference point pn+1，m+1The number of rows of the corresponding pixel points, and a correction reference point pn+1，mAnd a correction reference point pn+1，m+1Obtaining a phase correction value Y 'of the pixel point between the pixel points (j', i ') and (j', i ')'Line ofPhase correction amount expression with respect to the number of lines:
Y′line ofa′Line ofi+b′Line of
Wherein, a'Line of、b′Line ofAre respectively a constant;
according to the phase correction amount Y 'of the pixel point between the pixel points (j', i ') and (j', i ')'Line ofPhase correction value Y ' of pixel (j ', i) is obtained through phase correction value expression of line number 'Line of；
According to the phase correction value Y of pixel (j', i)Line ofAnd a phase correction value Y ' of pixel (j ', i) 'Line ofAnd fitting the column number of the pixel points (j ', i) and (j', i) to obtain a phase correction value expression of each pixel point between the pixel points (j ', i) and (j', i) about the column number:
Y＝aj+b
wherein a and b are constants respectively;
and acquiring the phase correction value Y of the pixel (j, i) according to the phase correction value expression of each pixel point between the pixel (j ', i) and the pixel (j', i) about the column number.
In another embodiment, the phase correction module is configured to obtain phase correction values of all pixel points in the LCoS microdisplay chip module by executing the following instructions:
j is more than or equal to 1 and less than or equal to J, I is more than or equal to 1 and less than or equal to I, and J and I respectively represent the column number and the row number of the pixel points in the LCoS micro-display chip module; the following operations are performed:
according to four correction reference points p around the distributed pixel points pixel (j, i)n，m、pn+1，m、pn，m+1、pn+1，m+1The phase correction value of (1) M + 1M, 1N + 1N, and pixel (j ', i'), pixel (j ", i '), pixel (j', i ') and pixel (j", i') corresponding to the four calibration reference points respectively, N and M respectively represent the column number and row number of the calibration reference points in the LCoS micro-display chip module, and j ', j ", i' respectively represent the column number and row number of the pixel points in the LCoS micro-display chip module, and the following instructions are executed:
combining with the correction reference points pn，mAnd a correction reference point pn+1，mThe number of columns of the corresponding pixel points, and a calibration reference point pn，mAnd a correction reference point pn+1，mObtaining the phase correction value Y of the pixel point between the pixel points (j ', i') and (j ', i')Column(s) ofPhase correction amount expression for the number of columns:
Ycolumn(s) of＝aColumn(s) ofj+bColumn(s) of
Wherein, aColumn(s) of、bColumn(s) ofAre respectively a constant;
according to the phase correction value Y of the pixel point between the pixel points (j ', i') and (j ', i')Column(s) ofPhase correction value Y of pixel (j, i') is obtained by phase correction value expression about column numberColumn(s) of；
Combining with the correction reference points pn，m+1And a correction reference point pn+1，m+1The number of columns of the corresponding pixel points, and a calibration reference point pn，m+1And a correction reference point pn+1，m+1Obtaining a phase correction value Y 'of the pixel point between the pixel points (j', i ') and the pixel point (j', i ')'Column(s) ofPhase correction amount expression for the number of columns:
Y′column(s) of＝a′Column(s) ofj+b′Column(s) of
Wherein, a'Column(s) of、b′Column(s) ofAre respectively a constant;
according to the phase correction amount Y 'of pixel point between pixel points (j', i ') and pixel (j', i ')'Column(s) ofPhase correction value Y ' of pixel (j, i ') is obtained through phase correction value expression of line number 'Column(s) of；
According to the phase correction value Y of pixel (j', i)Column(s) ofAnd a phase correction value Y ' of pixel (j ', i) 'Column(s) ofAnd fitting the line numbers of the pixel points (j ', i) and the pixel points (j', i) to obtain a phase correction value expression of each pixel point between the pixel points (j, i ') and the pixel points (j, i') relative to the line numbers:
Y＝a′i+b′
wherein a 'and b' are constants respectively;
and acquiring the phase correction value Y of the pixel (j, i) according to the phase correction value expression of each pixel between the pixel (j, i ') and the pixel (j, i') about the row number.
The driving module converts received signals such as HDMI and the like into RGB888 data required by the inside through the signal receiving conversion module, the number of default preset correction datum points is 25 under the condition that the outside is not configured, the fitting correction is carried out by using a linear piecewise fitting method, and the selection of the fitting method can be realized through the register configuration module.
In one embodiment, the resolution of the LCoS micro-display chip module of the target LCoS spatial light modulator is 1920 × 1080, and the number of the preset correction reference points is 25.
The signal receiving and converting module firstly selects one of signal formats from an RGB888 interface, an HDMI interface and/or a VGA interface according to configuration to convert, and calculates to obtain required data as output.
Referring to fig. 4, the correction reference points in 5 rows and 5 columns constitute 25 correction reference points in total:
the correction reference points of the first row are marked as: p is a radical of1，1、p2，1…p5，1(ii) a Pixel points corresponding to the correction reference points in the first row are pixel (1, 1) and pixel (481, 1).. pixel (1920, 1);
the correction reference points of the second row are marked as: p is a radical of1，2、p2，2…p5，2(ii) a Pixel points corresponding to the correction reference points in the first row are pixel (1, 271) and pixel (481, 271).. pixel (1920, 271);
the correction reference points of the third row are marked as: p is a radical of1，3、p2，3…p5，3(ii) a Pixel points corresponding to the correction reference points in the first row are pixel (1, 541) and pixel (481, 541).. pixel (1920, 541);
the correction reference points of the fourth row are labeled: p is a radical of1，4、p2，4...p5，4(ii) a Pixel points corresponding to the correction reference points in the first row are pixel (1, 811) and pixel (481, 811).. pixel (1920, 811);
the correction reference points of the fifth row are marked as: p is a radical of1，5、p2，5...p5，5(ii) a The pixel points corresponding to the correction reference points in the first row are pixel (1, 1080) and pixel (481, 1080).. pixel (1920, 1080).
After the phase correction values of the 25 correction reference points are obtained from the micro control module, the drive module performs linear piecewise fitting on the phase correction values. The piecewise fitting is divided into four steps, each step includes longitudinal piecewise fitting calculation and transverse piecewise fitting calculation, and in this embodiment, the longitudinal piecewise fitting calculation is performed first, and then the transverse piecewise fitting calculation is performed.
The first step is as follows: the longitudinal piecewise fitting is realized by firstly fitting p1，1And p1，2Curve between, then fitting p in turn2，1And p2，2Curve p between3，1And p3，2Curve p between4，1And p4，2Curve p between5，1And p5，2The curve in between; the horizontal piecewise fitting is realized by firstly fitting p1，1And p2，1The curve in between, then in turnFitting p2，1And p3，1Curve p between3，1And p4，1Curve p between4，1And p5，1The curve between the rows is the curve between the rows, and the data fitting of all the pixel points in the 1 st row is completed up to this point. And repeating the step of transverse fitting to finish the data fitting of all the pixel points on the 1 st to 271 th lines.
The second step is that: the longitudinal piecewise fitting is realized by firstly fitting p1，2And p1，3Curve between, then fitting p in turn2，2And p2，3Curve p between3，2And p3，3Curve p between4，2And p4，3Curve p between5，2And p5，3The curve in between; the horizontal piecewise fitting is realized by firstly fitting p1，2And p2，2Curve between, then fitting p in turn2，2And p3，2Curve p between3，2And p4，2Curve p between4，2And p5，2The curve between the rows is that the data fitting of all the pixel points in the 271 th row is completed. And repeating the step of transverse fitting to finish the data fitting of all the pixel points on the 272 th row to the 541 st row.
The third step: the longitudinal piecewise fitting is realized by firstly fitting p1，3And p1，4Curve between, then fitting p in turn2，3And p2，4Curve p between3，3And p3，4Curve p between4，3And p4，4Curve p between5，3And p5，4The curve in between; the horizontal piecewise fitting is realized by firstly fitting p1，3And p2，3Curve between, then fitting p in turn2，3And p3，3Curve p between3，3And p4，3Curve p between4，3And p5，3The curve between the rows is the curve between the rows, and the curve between the rows is the curve between the rows, so that the data fitting of all the pixel points on the 541 st row is completed. And repeating the step of transverse fitting to finish the data fitting of all the pixel points on the 542 th line to the 811 th line.
The fourth step: the longitudinal piecewise fitting is realized by firstly fitting p1，4And p1，5Curve between, then fitting p in turn2，4And p2，5Curve p between3，4And p3，5Curve p between4，4And p4，5Curve p between5，4And p5，5The curve in between; the horizontal piecewise fitting is realized by firstly fitting p1，4And p2，4Curve between, then fitting p in turn2，4And p3，4Curve p between3，4And p4，4Curve p between4，4And p5，4The curve between the rows, until the data fitting of all the pixel points in the 811 th row is completed. And repeating the step of transverse fitting to finish the data fitting of all pixel points on the 812 th row to the 1080 th row.
And according to the method, the fitting of the phase correction values of all pixel points in the LCoS micro-display chip module with the resolution of 1920x1080 is completed, signed addition operation is carried out on the data obtained by fitting and the data at the data source, and then the data is output, and the LCoS chip is lightened. According to the scheme, the correction system for the flatness of the LCoS micro-display chip module with the N × M correction reference points can be obtained, and the scheme is suitable for various different requirements: for the LCoS micro-display chip module with any resolution, the phase correction value of the correction reference point is fitted according to the selected data fitting method, so that the phase correction value of each pixel point in the LCoS micro-display chip module can be obtained, and the flatness of the LCoS micro-display chip module is corrected.
According to the method, phase information of N x M correction reference points can be obtained by measuring the phase information of a test image displayed on the LCoS micro-display chip module by an input data source, phase correction values of the N x M correction reference points are obtained by calculating the phase information, correction values of all pixel points are obtained by data fitting, the fitted data and the data of the data source are output after calculation, and a method for testing the number of the correction reference points and data fitting can be configured according to specific requirements, so that the effect of correcting the flatness of the LCoS micro-display chip module of the LCoS spatial light modulator is achieved.
The above description is only a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as the protection scope of the present invention.
Claims (11)
1. A display chip flatness correction system of an LCoS spatial light modulator is used for correcting the display flatness of an LCoS micro-display chip module in a target LCoS spatial light modulator and is characterized in that the target LCoS spatial light modulator consists of a driving module and the LCoS micro-display chip module, and the correction system comprises a micro-control module, a driving module, a phase modulation measuring module and the LCoS micro-display chip module;
the phase modulation measurement module is used for measuring the phase information of each preset correction reference point in the LCoS micro-display chip module when the LCoS micro-display chip module displays each test picture, further acquiring the phase response curve data corresponding to each correction reference point, and feeding back the phase response curve data of each correction reference point to the micro-control module;
the micro-control module is used for acquiring the phase correction value of each correction reference point according to the phase response curve data of each correction reference point and sending the phase correction value of each correction reference point to the driving module;
and the driving module is used for fitting the phase correction value of each correction reference point by combining the row and column positions of each correction reference point in the LCoS micro-display chip module according to the phase correction value of each correction reference point, further acquiring the phase correction value of each pixel point in the LCoS micro-display chip module, and correcting the phase of the corresponding pixel point according to the acquired phase correction value.
2. The LCoS spatial light modulator display chip flatness correction system of claim 1, wherein the method of fitting the phase correction amount for each correction reference point comprises: piecewise linear difference method, cubic spline difference method, linear fitting method, trigonometric function fitting method.
3. The LCoS spatial light modulator display chip flatness correction system of claim 2, wherein the driving module comprises a register configuration module; the register configuration module is used for data storage, selecting whether the phase correction function is turned on or not, and selecting a data fitting method.
4. The LCoS spatial light modulator display chip flatness correction system of claim 1, wherein the driving module is integrated inside a separate driving chip, or integrated inside an LCoS micro-display chip module, or an FPGA driver is used to replace the driving module and the LCoS micro-display chip module to form the LCoS spatial light modulator.
5. The LCoS spatial light modulator display chip flatness correction system of claim 1, wherein the driver module comprises a phase correction module, the phase correction module being integrated within the driver module, or integrated within the LCoS microdisplay chip module, or integrated within the FPGA.
6. The LCoS spatial light modulator display chip flatness correction system of claim 1, wherein the micro control module employs a CPU, GPU, MCU or DSP.
7. The LCoS spatial light modulator display chip flatness correction system of claim 1, wherein the micro control module is configured to randomly select one of the phase response curves corresponding to the calibration reference points as a reference phase reference curve, and compare each phase value in the phase response curve of each calibration reference point with a phase value at a corresponding position in the reference phase reference curve to obtain the phase correction value of each calibration reference point.
8. The LCoS spatial light modulator display chip flatness correction system of claim 7, wherein the phase modulation measurement module is configured to measure each test picture, and send the obtained phase response curve data of each calibration reference point to the micro control module until the control command sent by the micro control module to the driving module corrects the difference between each phase value in the phase response curve of each calibration reference point and the phase value of the corresponding position in the reference phase reference curve to within an allowable error range.
9. The LCoS spatial light modulator display chip flatness correction system of claim 1, wherein the driving module, the LCoS microdisplay chip module, the micro-control module, and the micro-control module and the phase modulation measurement module are all in communication mode, and the communication mode includes URAT communication, I2C communication, SPI communication, and MIPI communication.
10. The LCoS spatial light modulator display chip flatness correction system of claim 1, wherein the driving module comprises a signal receiving conversion module, a storage control module;
the driving module receives data transmitted by the RGB888 interface, the MIPI interface, the HDMI interface or the VGA interface, converts the data into signals which can be identified by the LCoS micro-display chip module through the signal receiving and converting module, and outputs the required data to the storage control module through calculation and selection.
11. The LCoS spatial light modulator of any one of claims 1 to 10, wherein the phase modulation measurement module comprises a phase measurement system for measuring the phase of a calibration reference point in the display chip;
the phase measurement system includes: the device comprises a light source, a polarizer polaroid, a beam splitter prism, a wave plate, an analyzer and an optical power meter; the light-emitting end of the light source faces one side surface of the polarizer polaroid, a light beam emitted by the light source is vertical to the plane of the polarizer polaroid, the other side surface of the polarizer polaroid faces the beam splitting prism, and the light beam passing through the polarizer polaroid and a coating layer in the beam splitting prism form an included angle of 45 degrees;
the LCoS micro-display chip module and the wave plate are respectively arranged on two sides of the right-angle beam splitter prism, the working end of the LCoS micro-display chip module is opposite to one side surface of the wave plate, the other side surface of the wave plate is opposite to one side surface of the analyzer, and the other side surface of the analyzer faces to a light beam sampling end of the optical power meter;
the light beam emitted by the light source is incident to the coating surface of the beam splitter prism after passing through the polarizer polaroid, the light beam reflected by the coating surface is incident to the correction reference point in the LCoS micro-display chip module, and the light beam reflected by the LCoS micro-display chip module sequentially passes through the polarization surfaces of the beam splitter prism, the wave plate and the analyzer and then is incident to the light beam sampling end of the optical power meter.
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