CN111491144B - Display method, display system and computer storage medium - Google Patents

Abstract

The present application discloses a display method, which includes: determining the minimum modulation time of each bit of data; writing the first light segment data and the second light segment data according to the minimum modulation time of each bit of data; mixing the first light segment data and the second light segment data Two light segments of data to generate a corresponding display image; wherein, the minimum modulation time of each bit of data is determined according to the update frequency of the signal source, the grayscale information of the first light segment and the second light segment of each pixel. Through the above method, the display method of the present application can effectively improve the rainbow effect appearing in the displayed image and improve the display quality by determining the minimum modulation time of each bit of data.

Description

Display method, display system and computer storage medium

technical field

The present application relates to the field of display technology, in particular to a display method, a display system and a computer storage medium.

Background technique

In optical instruments in the display field, such as LCD projectors and DLP (Digital Light Processing, digital light processing) projectors, there is a problem: the rainbow effect.

In the RGB sequential lighting projection system, the RGB color does not overlap at the edge of the color image, which is called the rainbow effect. The reason for the formation of the rainbow effect is that within an image frame, the image positions of the RGB sub-frame images displayed in time series cannot overlap on the retina of the human eye. This phenomenon is more obvious for color images moving on the screen. The cause of misalignment of RGB color sub-frames on the retina may be the movement of the eyeballs, or there may be an optical path switch in the imaging optical path from the projected image to the human eye, so that the human eye can sample at a certain time frequency.

Similar to the human eye, optical image acquisition devices, such as cameras or high-speed cameras, also have an image sampling frequency. When the sampling frequency is greater than or approximately equal to the refresh rate of the illumination light field (mostly 3*60=180Hz), different color sub-frames The images will be captured separately, making the time integration of primary color mixing worse, resulting in a rainbow effect.

In summary, the rainbow effect may involve two broad categories of issues. The first type is the separation of different colors at the edge of the (still or moving) image, and the second type is that the monochromatic illumination light field of the entire image is sampled separately, and the light mixing effect of the primary color is split. The crux of the two types of problems lies in the low refresh rate (generally 180 Hz) of the sequential monochromatic illumination light field in the projection system.

Contents of the invention

The present application provides a display method, a display system and a computer storage medium, so as to improve the rainbow effect in the projection display in the prior art.

In order to solve the above technical problems, this application proposes a display method, including determining the minimum modulation time of each bit of data; writing the first light segment data and the second light segment data according to the minimum modulation time of each bit of data; mixing the first light segment Segment data and second light segment data to generate corresponding display images; wherein, the minimum modulation time of each bit of data is determined according to the update frequency of the image signal source, the grayscale information of the first light segment and the second light segment of each pixel Sure.

In order to solve the above technical problems, this application proposes a display system, including a first light source, a second light source, a first light modulator and a light combiner; the first light source is used to generate light in the first light segment, and the second light source is used to For generating the light of the second light segment, the first light modulator is used to receive the light of the first light segment emitted by the first light source and the light of the second light segment emitted by the second light source, and receive the control signal to write the The first light segment data and the second light segment data, the light combiner is used to mix the first light segment data and the second light segment data to generate a corresponding display image, wherein the display system is also used to execute the above display method.

In order to solve the above-mentioned technical problems, the present application proposes a computer storage medium in which a computer program is stored, and when the computer program is executed by a processor, the minimum modulation time t _LSB of each bit of data is determined in the above display method and according to the minimum modulation time t LSB of each bit of data The step of writing the first optical segment data and the second optical segment data by modulating time.

This application proposes a display method, including determining the minimum modulation time of each bit of data; writing the first light segment data and the second light segment data according to the minimum modulation time of each bit of data; mixing the first light segment data and the second light segment Segment data to generate a corresponding display image; wherein, the minimum modulation time of each bit of data is determined according to the update frequency of the image signal source, the grayscale information of the first light segment and the second light segment of each pixel. Through the above method, the minimum modulation time of each bit of data is determined according to the update frequency of the image signal source, the grayscale information of the first light segment and the second light segment of each pixel, and then according to the determined minimum modulation time of each bit of data Adjust the spatial light modulator to write the data of the first light segment and the data of the second light segment. When determining the minimum modulation time, this application takes into account the influence of the short-term lighting off of the color wheel, so that the consistency of the minimum modulation time is higher. Further improve the imaging quality of the displayed image and improve the rainbow effect.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is a schematic flow chart of an embodiment of the display method of the present application;

Fig. 2 is a schematic diagram of timing control in one frame of the present application;

Fig. 3 is a schematic diagram of the optical path of an embodiment of the display system of the present application;

Fig. 4 is a schematic diagram of the optical path of another embodiment of the display system of the present application;

Fig. 5 is a schematic diagram of the optical path of another embodiment of the display system of the present application;

FIG. 6 is a schematic diagram of the control of the sequential light source in FIG. 5 .

Detailed ways

In order to enable those skilled in the art to better understand the technical solution of the present application, a display method and a display system provided by the present invention will be further described in detail below with reference to the drawings and specific embodiments.

The display method, display system and computer storage medium in this application mainly solve the rainbow effect in projection display, and the rainbow effect involves two types of problems. The first type is the separation of different colors at the edge of a still or moving image, and the second type is that the monochromatic illumination light field of the entire image is sampled separately, and the light mixing effect of the primary color is split. The crux of the two types of problems lies in the low refresh rate of the sequential monochrome illumination light field in the display system. Therefore, it is necessary to use the high refresh rate of the light source to weaken the rainbow effect. Based on this, this application proposes a display method and display system, which can be applied to multiple display fields. The following describes the application in the field of projection technology.

Please refer to FIG. 1. FIG. 1 is a schematic flowchart of an embodiment of a display method in the present application, wherein the display method includes:

S11: Determine the minimum modulation time (t _LSB ) of each bit of data.

In this embodiment, a light source with a high refresh rate is used as the light source of the projection system. The projection system of the present application uses the light source to sequentially input the light of the first light segment (such as the yellow light segment) and the light of the second light segment (such as the blue light segment) , and use the light modulator to modulate them into first light segment data and second light segment data respectively, and mix the above first light segment data and second light segment data to generate corresponding images. In addition, those skilled in the art can understand that the yellow light in the first light segment can also be further decomposed into red light in the red light segment and green light in the green light segment, which can be respectively modulated into the red light segment by using a light modulator. data and green segment data, and then mix the above-mentioned red segment data, green segment data and blue segment data of the second segment, thereby generating a corresponding image. That is to say, in this embodiment, the light of the first light segment and the light of the second light segment are input in time series, and then modulated to generate RGB data, thereby displaying corresponding images.

N为图像信号源一帧画面中出射白光混光子段的个数，可以预见，当N＞1时，图像信号源的白色混光的频率变为原来的N倍，彩虹效应相应会有减弱。Generally, the display time of one frame image in the projection system is t _FRAME . In the embodiment of 2D display, there are multiple frames of images within 1 second, and the continuous playback of multiple frames of images forms a dynamic picture. Each frame of image corresponds to a Each image to be displayed corresponds to a display period, and the display period is the modulation period of the image to be displayed. In other words, for a 2D display display device, one image to be displayed corresponds to a modulation period. In the embodiment of 3D display, there are multiple frames of images within 1 second, and the continuous playback of multiple frames of images forms a dynamic 3D picture, wherein each frame of 3D images corresponds to two images to be displayed, and each frame of images to be displayed corresponds to A display period, the display period is the modulation period of the image to be displayed. In other words, for a 3D display device, one frame of an image to be displayed corresponds to two consecutive modulation periods. In this embodiment, in order to better realize white light mixing, the time for one frame of image display can be divided into multiple multi-color light mixing time periods as t _FRAME , and a period of white light mixing time is set as t _WHITE , where

N is the number of white light mixing sub-segments emitted in one frame of the image signal source. It can be predicted that when N>1, the frequency of the white light mixing of the image signal source becomes N times the original, and the rainbow effect will be weakened accordingly.

For a certain spatial light modulator display scheme, the time required to display the smallest bit is the minimum modulation time and is recorded as t _LSB . t _LSB is a parameter that can be configured when light modulation is implemented in the projection system. Generally, it is based on the spatial light modulator The time response of the mechanical movement is set to a constant value, between ten microseconds and tens of microseconds, and there are slight differences between different processes and structures. However, in this embodiment, considering that t _LSB may have a non-integer number of t _LSB accumulation problems in the white light mixing sub-section, t _LSB is based on the update frequency of the image signal source, the first light section and the second light section of each pixel The grayscale information of the light segment is determined, so that the display time of one frame corresponds to an integer multiple of the minimum modulation time t _LSB . In addition, the critical display problem between different color segments of the color wheel is also considered in this embodiment, so that the projection system has more High display effect.

Specifically, determine t _LSB according to the following formula:

In the formula, t _LSB is the minimum modulation time of each bit of data, t _FRAME is the display time of one frame, N is the number of outgoing white light mixing sub-segments in one frame of the image signal source, M _SBK1 is the second light segment data The number of minimum modulation times for each bit of data included in the time period after writing to the time period before the next first light segment data is written, M _Y is the time period for writing the first light segment data in each white light mixing sub-segment The number of minimum modulation times per bit of data included, M _SBK2 is the number of minimum modulation times per bit of data included in the time period after the first optical segment data is written and before the next second optical segment data is written , and M _B is the number of minimum modulation times for each bit of data included in the time period for writing the second light segment data in each white light mixing sub-segment. Please refer to FIG. 2 . FIG. 2 is a schematic diagram of timing control in one frame of the present application.

Wherein, M _SBK1 and M _SBK2 are short-time off lighting in the sequential light source. Timing light sources can be roughly divided into two types: broadband light source + filter color wheel, laser + fluorescent color wheel, RGB LED light source or RGB laser light source. Broad-spectrum light source + filter color wheel mode uses a high-speed rotating color wheel to sequentially intercept RGB color light from the light source and project it onto the spatial light modulator to generate a two-dimensional grayscale pattern, which is then projected onto the screen to achieve color display. Mode of operation In projection systems selectively not projecting images on the screen due to color impurity in alternating areas of different colors, ie briefly switching off the lighting phenomenon.

The working mode of laser + fluorescent color wheel is similar to that of broadband light source + filter wheel. The difference is that the broadband light source is replaced by blue laser, and the color wheel is replaced by a fluorescent color wheel with a wavelength conversion layer. Fluorescence can be used in a separate The red light and the green light can also be intercepted by the color wheel from the generated yellow light.

RGB LED light source and RGB laser light source have a similar working principle. The difference from the working mode of the color wheel is that the RGB color light is generated by a separate LED or laser, and the RGB color light is processed separately in time sequence through time division multiplexing. Time sequence light The field is usually realized by sequentially controlling the drive current on and off of the RGB LED or RGB laser, that is, there is a short-term shutdown of the lighting.

Further, M _Y and M _B can be determined in the following manner:

Since most of the grayscale information in the signal is expressed in binary form, the grayscale information x∈[0,1] of the first light segment and/or the second light segment of each pixel in the image signal source is converted into an n-bit Binary data [a ₀ a ₁ …a _n-1 ] ₂ , where,

Then determine M _Y and M _B according to the following formula:

Among them, n _Y is the number of digits that the grayscale information of the first light segment is converted into binary data, and n _B is the number of digits that the grayscale information of the second light segment is converted into binary data, and M _Y N is one The grayscale information of the first light segment data in the frame picture, M _B N is the gray level information of the second light segment data in a frame picture, q _Y is the correction factor of the first light segment, q _B is the second light segment Correction factor, the correction factor can adjust the number of bits of gray information in the first light segment and the second light segment, and can realize the integer output of the minimum modulation time according to the refresh frequency of the image signal source. In this embodiment, the values of M _SBK1 , M _Y , M _SBK2 , M _B , and N are preferably combined to meet the white balance of color matching, and make the values of n _Y and n _B as large as possible, which can achieve greater grayscale The number of modulation bits; the values of q _Y and q _B are as small as possible, which can reduce the impact on the restoration of image signal source information.

S12: Write the first optical segment data and the second optical segment data according to t _LSB .

From the above formula, t _LSB can be determined, and t _LSB is used to realize the light modulation in the projection system. For example, in a DLP display, t _LSB is used to control the flipping time of a single reflector in the last frame of a DMD (digital micromirror device, digital mirror) flipping from one state to another. For example, assuming that DMD can realize 15-bit RGB display within one frame (1/60=16.67ms), and the RGB three color timings are evenly distributed, that is, one color sub-frame can realize 5-bit grayscale display. Each color flips 2^5=32 times within the lighting time, and the time required to complete each flip is (16.67ms)/(3*32)≈174us, corresponding to the time for LSB flipping, that is, t _LSB .

When the DMD is used as the spatial light modulator to alternately write the first light segment data and the second light segment data, a frame of picture is divided into N sub-segments, and each sub-segment includes M _Y minimum modulation time first light segment data And the second light segment data of M _B minimum modulation times, the first light segment data of M _Y minimum modulation times and the second light segment data of M _B minimum modulation times can be used to control the corresponding mirror open state or off state. Use the time of M _Y *t _LSB in the first first light segment to realize the first (M _Y -1) data in the grayscale binary representation of the color, and the time of M _B *t _LSB in the first yellow light segment to Realize the first (M _B -1) data in the grayscale binary representation of the color, and use the time of M _Y *t _LSB in the second first light segment to realize the second M _Y data in the binary representation of the grayscale color , the time of M _B *t _LSB in the second second light segment is used to realize the second M _B data in the color grayscale binary representation, ..., and so on until all the data information corresponding to RGB is displayed, which can be The q _Y minimum modulation time data corresponding to the first light segment data in the last few sub-segments are set to 0, and the q _B minimum modulation time data corresponding to the second light segment data in the last few sub-segments are set to 0 .

In other embodiments, a liquid crystal switch device may also be used instead of the DMD as the spatial light modulator. The modulation principle of the liquid crystal switch device is similar to that of DMD, the difference is that in the DMD modulation mode, the time of the micro-mirror opening state corresponding to the sub-segment is mapped to the transmittance of the liquid crystal to realize the adjustment of the gray scale.

Specifically, in an embodiment using a liquid crystal switch device for modulation, t _LSB is the time for a single display of the three colors of RGB. When the liquid crystal switch device is used as the spatial light modulator to alternately write the first light segment data and the second light segment data, each pixel of a frame picture includes N sub-segments, and each sub-segment includes segments M _Y minimum The first light segment data of the modulation time and the second light segment data of the segment M _B minimum modulation time, and write the first light segment data by controlling the light transmittance of each liquid crystal switch in the liquid crystal switch device and second light segment data;

Among them, the light transmittance of each liquid crystal switch is:

Wherein, M is the number M _Y of the minimum modulation time corresponding to the first light segment data in each sub-segment or the number M _B of the minimum modulation time corresponding to the second light segment data, and M _on is M _Y The number that is in the open state in or the number that is in the open state in _MB .

In order to better understand the method of modulating light in the above embodiments, two specific examples are given below:

example 1:

Use the DMD modulator to display grayscale information.

取M_SBK1＝M_SBK2＝5，则可以求得t_LSB＝28.1531us，q_Y＝q_B＝0。Assuming that the update frequency of the image signal source is 60Hz, RGB is 8-bit color grayscale, and one frame contains 8 sub-segments of RGB mixed light to become white light output, then N=8, n _Y =n _B =8,

Taking M _SBK1 =M _SBK2 =5, then t _LSB =28.1531us, q _Y =q _B =0 can be obtained.

If a certain (R/G/B) 8-bit color corresponds to a grayscale of 0.5020 in one frame, then the corresponding binary number from the least significant bit to the most significant bit is 0.5020*(2 ⁸ -1)=128=[ 00000001] ₂ . If there are 8 sections of white light mixed light output in one frame, then 2 ⁸ = 256 data can be divided into 8 32 data, corresponding to the display status of the reflector, where "0" corresponds to the off state of the reflector, "1" Corresponding to the open state of the mirror:

(00000000000000000000000000000000),

(00000000000000000000000000000000),

(00000000000000000000000000000000),

(00000000000000000000000000000000),

(1111111111111111111111111111111),

(1111111111111111111111111111111),

(1111111111111111111111111111111),

(1111111111111111111111111111111).

In other embodiments, the binary number corresponding to a certain (R/G/B) 8-bit color in one frame can also be from the most significant bit to the least significant bit, which is [11111110] ₂ , corresponding to the display of the mirror The statuses are:

(1111111111111111111111111111111),

(1111111111111111111111111111111),

(1111111111111111111111111111111),

(1111111111111111111111111111111),

(00000000000000000000000000000000),

(00000000000000000000000000000000),

(00000000000000000000000000000000),

(00000000000000000000000000000000).

In the above-mentioned embodiment, the minimum modulation time of each mirror is calculated according to the parameters, and the corresponding display state of the mirror in one frame of picture is calculated. It should be noted that, in the above-mentioned embodiment, only two modes of the state of the mirror are given. In other embodiments, those skilled in the art can also set the display state of the mirror corresponding to the 8 32 data to other binary data.

Example 2:

Grayscale information is displayed using a liquid crystal switching device modulator.

取M_SBK1＝M_SBK2＝5，则可以求得t_LSB＝28.1531us，q_Y＝q_B＝0。Assuming that the update frequency of the image signal source is 60Hz, RGB is 8-bit color grayscale, and one frame contains 8 sub-segments of RGB mixed light to become white light output, then N=8, n _Y =n _B =8,

Taking M _SBK1 =M _SBK2 =5, then t _LSB =28.1531us, q _Y =q _B =0 can be obtained.

If a certain (R/G/B) 8-bit color corresponds to a grayscale of 0.5020 in one frame, the corresponding binary number from the least significant bit to the most significant bit is 0.5020*(2 ⁸ -1)=128=[00000001 ] ₂ . If there are 8 segments of mixed white light emitted in one frame, then 2 ⁸ = 256 data can be divided into 8 32 data, and the transmittances of the liquid crystal pixels corresponding to the 8 sub-segments are respectively

Example 2 introduces the display of grayscale information with a liquid crystal switch device modulator. Similar to example 1, the binary number corresponding to the grayscale can also be from the most significant bit to the least significant bit, which is [11111110] ₂ , corresponding to the liquid crystal pixel The transmittance is

It can be known from the above several implementations that the display method of the present application fixes the minimum modulation time, and expresses the grayscale information by controlling the state of the DMD mirror or the transmittance of the liquid crystal, which is expressed by controlling the modulation time in the prior art. Grayscale information is very different.

S13: Mixing the first light segment data and the second light segment data to generate a corresponding display image.

The modulated first light segment data and second light segment data are projected onto the screen, and a corresponding color projection image is generated through light mixing to realize the entire projection process.

A display method is proposed in this embodiment, including determining the minimum modulation time of each bit of data; alternately writing the first light segment data and the second light segment data according to the minimum modulation time of each bit of data; mixing the first light segment data and second light segment data to generate corresponding display images. Through the above method, using a high-frequency light source and determining a specific t _LSB , the sampling frequency of human eyes is lower than the refresh rate of the light source, and non-integer t _LSB accumulation is not generated, which can effectively reduce the rainbow effect and improve imaging quality.

Further, in the above embodiment, the first light segment may be a yellow light segment, and the second light segment may be a blue light segment. Please refer to FIG. 3 . FIG. 3 is a schematic diagram of an optical path of an embodiment of a display system of the present application. The projection system includes a first light source 21, a second light source 22, a first light modulator 23 and a light combiner 24, wherein the first light source 21 is used to generate the light in the yellow segment, and the second light source 22 is used to generate the light in the blue segment. light, the first light modulator 23 is used to receive the light of the yellow light segment emitted by the first light source 21 and the light of the blue light segment emitted by the second light source 22, and receive the control of the control signal to alternately write the first light segment data and the second light segment data, the light combiner 24 is used to mix the first light segment data and the second light segment data to generate corresponding display images.

Further, the display system further includes a light splitter 25 and a second light modulator 26, please refer to FIG. 4, which is a schematic diagram of an optical path of another embodiment of the display system of the present application. Wherein, after the light of the yellow light segment generated by the first light source 21 is input to the beam splitter 25, the light splitter 25 decomposes the light of the yellow light segment into red light and green light, and respectively inputs to the first light modulator 23 and the second light modulator 23. The light modulator 26 modulates to write the red light segment data and the green light segment data, the first light segment data is the red light segment data or the green light segment data, and the optical combiner 24 is used to write the red light segment data and the data of the green light segment are synthesized into the data of the yellow light segment, and further combined with the data of the second light segment to generate a corresponding projection image.

In order to better introduce the display system in this application, please refer to FIG. 5 . FIG. 5 is a schematic diagram of an optical path of another embodiment of a display system in this application.

The laser group 101 and the laser group 102 are respectively used as the first light source and the second light source to generate blue light for blue light illumination and for exciting yellow fluorescence, wherein the wavelength of the laser group 101 is preferably 465nm, and the wavelength of the laser group 102 455nm is preferred to better achieve the REC2020 color gamut standard. Its current is regulated by the laser group controller 201 and the laser group controller 202 respectively, and the regulation frequency is preferably 1200 Hz, that is, the regulation current waveform is approximately a square wave with a period of 1200 Hz and a certain duty cycle, or even other waveforms that can realize current regulation. The ratio of the duty cycle is based on the principle of choosing RGB mixed light to achieve higher power white light. A kind of preferred control waveform is as shown in Figure 6, wherein red (R:Red) and green (G:Green) corresponding time period laser group 101 is in shut-off state, laser group 102 is in working state, for the sake of convenience, this This working state is hereinafter referred to as "yellow light segment", and the time period corresponding to the blue (B: Blue) and white (E: Empty) laser group 101 is in the working state, and the laser group 102 is in the off state. The working status is referred to as "Blu-ray segment" below.

During the yellow light period, the blue laser light generated by the laser group 102 is incident on the translucent yellow and anti-blue glass slide 301 and then reflected and incident on the rotating color wheel 401 covered with fluorescent powder 402 to excite fluorescence. The generated yellow fluorescence is collected by the fluorescence collecting lens group 302 and passes through the transparent yellow anti-blue glass slide 301 , and then enters the uniform light element 303 . The dodging element 303 can use a square rod or a compound eye or other devices that can achieve a dodging function. After that, it enters the relay lens group 304 for imaging and then enters the modulation surface of the spatial light modulator. The blue laser light generated by the laser group 101 is incident on the transparent yellow anti-blue glass slide 301 and is reflected to the uniform light element 303 .

A wavelength splitting prism 305 is also placed in the imaging light path, and a green-transmitting anti-red-blue prism is preferably used. Therefore, the yellow light in the yellow light segment is decomposed into red light and green light by the wavelength splitting prism 305 . Red and green light enters two separate light paths. The wavelength splitting prism 305 uses prisms preferentially because it is considered that when using the same component triangular prism, the red light and the green light have the same optical path, which can save the mold opening cost of optical components and structural parts. 305 can also use other wavelength splitting devices that can achieve similar functions, such as green-transmitting anti-red-blue glass slides. Correspondingly, compensation for the optical path difference between red light and green light should be considered, and a method of designing different thicknesses of triangular prisms can be used. Correspondingly, after the red light and green light are generated, a color filter can be combined to modify the color to meet the display requirements of different color gamuts.

The red light and the green light pass through the triangular prism groups 306 and 307 matched with the DMD to form uniform illumination on the DMD501 and DMD502 modulation surfaces respectively, go out through the gray scale modulation of the DMD, and combine the light with the wavelength combination device 308 . DMD501 and DMD502 are used as a first modulator and a second modulator to modulate the received light respectively, and are controlled by controller 601 and controller 602 to generate corresponding red light segment data and green light segment data.

The wavelength combining device 308 may be a green-transmitting anti-red-blue prism. The wavelength-splitting element 305 and the wavelength-combining element 308 are preferably selected to have matching reflection and transmission spectral characteristics, so as to achieve higher light efficiency. The mixed yellow light after light combination is projected onto the screen through the lens group 309 .

During the blue light period, the laser group 101 is in working state, the system generates blue illumination, and the generated blue laser light passes through the laser speckle elimination element 310 and is reflected by the translucent yellow anti-blue glass slide 301 into the yellow light path. The speckle elimination element 301 can be a rotating wheel with a scattering sheet or other elements that can eliminate laser coherence, and the illumination of the emitted blue light is preferentially designed to match the yellow fluorescent light. The blue light entering the yellow light path enters the DMD501 after passing through the green and anti-red and blue glass slide 305, and after being modulated by the DMD501, passes through the triangular prism group 306, the wavelength combining device 308 and the lens group 309 and then projects onto the screen.

The yellow light segment and the blue light segment work alternately, and the effect of weakening the rainbow effect is achieved by controlling the length of the time segment. Specifically, it is implemented through a spatial light modulator. After each parameter is determined according to the above formula, in order to display the grayscale information corresponding to each color, it is necessary to establish a mapping relationship between the grayscale representation and the grayscale display in each sub-segment. The specific mapping relationship needs to be determined according to the display principle of the spatial light modulator. The method of using the spatial light modulator to realize light modulation according to t _LSB is similar to that in the above-mentioned embodiment, and will not be repeated here.

In this embodiment, the process of the generation of yellow light segment and blue light segment and their alternate work is introduced in detail, through the high-frequency alternate operation of yellow light segment and blue light segment and according to the update frequency of the image signal source, the first time of each pixel The method of determining t _LSB based on the grayscale information of the light segment and the second light segment can improve the rainbow effect in the projected image and improve the projection quality.

The present application also includes a computer storage medium. The computer storage medium stores a computer program. When the computer program is executed by the processor, the minimum modulation time t _LSB of each bit of data is determined in the above display method, and the first light segment data and the second light segment are written according to the minimum modulation time of each bit of data. The principles and steps of the steps in any embodiment of the optical segment data are similar, and will not be repeated here. The computer storage medium may be provided in the controller of the above-mentioned spatial light modulator. Further, the computer storage medium may also be a USB flash drive, a mobile hard disk, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic tape or an optical disc, and other media that can store program codes.

To sum up, this application proposes a display method and a display system, which can be applied not only to projection systems, but also to other display fields to solve the problem of rainbows in displayed images.

The above is only the implementation of the application, and does not limit the patent scope of the application. Any equivalent structure or equivalent process conversion made by using the specification and drawings of the application, or directly or indirectly used in other related technologies fields, are all included in the scope of patent protection of this application in the same way.

Claims (11)

1. A display method, characterized in that, comprising: Determine the minimum modulation time t _LSB of each bit of data; Alternately writing the first optical segment data and the second optical segment data according to the minimum modulation time of each bit of data; blending the first light segment data and the second light segment data to generate a corresponding display image; Wherein, the minimum modulation time of each bit of data is determined according to the update frequency of the image signal source, the grayscale information of the first light segment and the second light segment of each pixel, and the short-time off illumination of the sequential light source. 2. The method according to claim 1, wherein the minimum modulation time of each bit of data is determined according to the following formula,

Among them, t _LSB is the minimum modulation time of the data per bit, t _FRAME is the display time of one frame of the image signal source, N is the number of outgoing white light mixing sub-segments in one frame of the image signal source, M _SBK1 is the number of minimum modulation times per bit of data included in the time period after the second light segment data is written and before the next first light segment data is written, and M _Y is the number of each white light mixing sub-segment The number of minimum modulation times for each bit of data included in the time period for writing the first light segment data, M _SBK2 is the number of times after the first light segment data is written to the next second light segment data write The number of minimum modulation times per bit of data included in the previous time period, and M _B is the number of minimum modulation times per bit of data included in the time period for writing the second light segment data in each white light mixing sub-segment number. 3. method according to claim 2, is characterized in that, described M _Y and M _B are determined according to the following manner: Convert the grayscale information x∈[0,1] of the first light segment and/or the second light segment of each pixel in the image signal source into binary data with n bits [a ₀ a ₁ ...a _{n- 1} ] ₂ , where,

Then determine M _Y and M _B according to the following formula:

Among them, n _Y is the number of digits that the grayscale information of the first light segment is converted into binary data, and n _B is the number of digits that the grayscale information of the second light segment is converted into binary data, and M _Y N is one The number of bits of the first light segment data in the frame picture, M _B N is the number of bits of the second light segment data in a frame picture, q _Y is the correction factor of the first light segment, and q _B is the second light segment The correction factor for the segment. 4. The method of claim 3, further comprising: converting the n-bit binary data [a ₀ a ₁ ... a _n-1 ] ₂ corresponding to the grayscale information of the first light segment and/or the second light segment of each pixel in the image signal source into N The data of the first optical segment of M _T minimum modulation times and/or the data of the second optical segment of N segments M _B of minimum modulation times. 5. The method according to claim 4, wherein when a digital mirror is used as a spatial light modulator to write the first light segment data and the second light segment data, each frame of a picture The pixel includes N sub-sections, and each sub-section includes M _Y first light segment data of the minimum modulation time and M _B second light segment data of the minimum modulation time, wherein each sub-section The binary data corresponding to the first optical segment and the binary data corresponding to the second optical segment are used to control the opening or closing of the corresponding mirror. 6. The method according to claim 4, wherein when a liquid crystal switch device is used as a spatial light modulator to write the first light segment data and the second light segment data, each frame of a picture The pixel includes N sub-segments, and each sub-segment includes M _Y pieces of the first light segment data of the minimum modulation time and M _B pieces of the second light segment data of the minimum modulation time, and by controlling the The light transmittance of each liquid crystal switch in the liquid crystal switch device is used to write the first light segment data and the second light segment data. 7. The method according to claim 6, wherein the light transmittance of each liquid crystal switch is:

Wherein, M is the number of minimum modulation times M _Y corresponding to the first light segment data or the number M _B of minimum modulation times corresponding to the second light segment data, and M _on is the number of M _Y that is on or off. The number of states or the number of open states in _MB . 8. The method according to claim 1, wherein the first light segment is a yellow light segment, and the second light segment is a blue light segment. 9. A display system, characterized in that it comprises a first light source, a second light source, a first light modulator and a light combiner; the first light source is used to generate the light of the first light segment, and the second light source Used to generate light in the second light segment, the first light modulator is used to receive the light in the first light segment emitted by the first light source and the light in the second light segment emitted by the second light source, and receive control The control signal is used to write the first light segment data and the second light segment data, and the light combiner is used to mix the first light segment data and the second light segment data to generate corresponding display images ; The display system is used to execute the steps of the display method described in any one of claims 1-8. 10. The display system according to claim 9, further comprising a beam splitter and a second light modulator, wherein the light of the first light segment generated by the first light source is input to the After the optical splitter, the optical splitter decomposes the light of the first optical segment into a third optical segment and a fourth optical segment, and input them to the first optical modulator and the second optical modulator respectively for modulation to write the third optical segment data and the fourth optical segment data, and the optical combiner is used to synthesize the written third optical segment data and the fourth optical segment data, and further combine with the second The light segment data is synthesized to generate the corresponding display image. 11. A computer storage medium, characterized in that the computer storage medium stores a computer program, and when the computer program is executed by a processor, it implements the display method as described in any one of claims 1-7 A step of determining the minimum modulation time t _LSB of each bit of data and writing the first light segment data and the second light segment data according to the minimum modulation time of each bit of data.

Images