WO2020156295A1

WO2020156295A1 - Display method, display system and computer storage medium

Info

Publication number: WO2020156295A1
Application number: PCT/CN2020/073092
Authority: WO
Inventors: 陈晨; 胡飞; 余新; 李屹
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2019-01-28
Filing date: 2020-01-20
Publication date: 2020-08-06
Also published as: CN111491144B; CN111491144A

Abstract

Disclosed is a display method, comprising: determining the minimum modulation time of each bit of data; writing, according to the minimum modulation time of each bit of data, first optical segment data and second optical segment data; and mixing the first optical segment data with the second optical 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 a signal source, and grayscale information of a first optical segment and a second optical segment of each pixel. By means of the method, the display method of the present application can effectively improve, by means of determining the minimum modulation time of each bit of data, a rainbow effect occurring in the display image, thereby improving the display quality.

Description

Display method, display system and computer storage medium

Technical field

This 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) projectors, there is a problem: the rainbow effect.

In the RGB sequential lighting projection system, the phenomenon that RGB colors do not coincide at the edges of the color image is called the rainbow effect. The reason for the formation of the rainbow effect is that within an image frame, the imaging positions of the RGB sub-frame images displayed in time sequence on the retina of the human eye cannot be overlapped. This phenomenon is more obvious for moving color images on the screen. The reason for the non-coincidence of RGB color sub-frames on the retina may be the movement of the eyeball, or there may be an optical 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 image sampling frequencies. When the sampling frequency is greater than or approximately equal to the refresh frequency of the illumination light field (mostly 3*60=180Hz), sub-frames of different colors The images will be collected separately, making the time integration effect of the primary color mixing worse, resulting in a rainbow effect.

In summary, the rainbow effect may involve two major types of problems. The first type is the separation of different colors on the edges of the (still or moving) image. 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 colors is separated. The key crux of the two types of problems lies in the low refresh frequency of the sequential monochromatic illumination light field in the projection system (generally 180 Hz).

Summary of the invention

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

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 optical segment data and the second optical 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 the corresponding display image; wherein the minimum modulation time of each bit of data is based on the update frequency of the image signal source, the gray information of the first light segment and the second light segment of each pixel determine.

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 generate 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 technical problems, the present application proposes a computer storage medium in which a computer program is stored. 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 the minimum modulation time t _{LSB of} each bit of data is determined according to the minimum value of each bit of data. The step of writing the first optical segment data and the second optical segment data by modulating the time.

This application proposes a display method, including determining the minimum modulation time of each bit of data; writing the first optical segment data and the second optical segment data according to the minimum modulation time of each bit of data; mixing the first optical segment data and the second optical segment data 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 gray 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 gray 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 and 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 effect of the color wheel's short-term lighting off, so that the minimum modulation time is more consistent. Further improve the imaging quality of the displayed image and improve the rainbow effect.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings that need to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained from these drawings without creative work.

FIG. 1 is a schematic flowchart of an embodiment of the display method of the present application;

Figure 2 is a schematic diagram of timing control in one frame of the application;

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

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

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 control of the sequential light source in Fig. 5.

detailed description

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

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 major types of problems. The first type is the separation of different colors on the edges of still or moving images. 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 colors is separated. The key crux of the two types of problems lies in the low refresh frequency of the sequential monochromatic illumination light field in the display system. Therefore, it is necessary to use the high refresh frequency of the light source to reduce the rainbow effect. Based on this, the present application proposes a display method and display system that can be applied to multiple display fields. The present application will be introduced in the field of projection technology.

Please refer to FIG. 1. FIG. 1 is a schematic flowchart of an embodiment of a display method of 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 (for example, the yellow light segment) and the light of the second light segment (for example, the blue light segment). , And use the light modulator to respectively modulate the first light segment data and the second light segment data, and mix the first light segment data and the 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 a red light segment using light modulators. The data and the green light segment data are then mixed with the red light segment data, the green light segment data, and the blue light segment data of the second light segment to generate a corresponding image. That is to say, this embodiment mainly inputs the light of the first light segment and the light of the second light segment in time sequence, and then modulates to generate RGB data, thereby displaying the corresponding image.

Generally, the display time of one frame of image in the projection system is t _FRAME . In the implementation of 2D display, there are multiple frames of images within 1 second. The continuous playback of multiple frames of images forms a dynamic picture, and each frame of image corresponds to one A to-be-displayed image, each to-be-displayed image corresponds to a display period, and the display period is the modulation period of the to-be-displayed image. In other words, for a 2D display device, a to-be-displayed image corresponds to one Modulation period. In the implementation 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, where each frame of 3D image corresponds to two images to be displayed, and each image to be displayed corresponds to A display period is the modulation period of the image to be displayed. In other words, for a 3D display device, one frame of image to be displayed corresponds to two consecutive modulation periods. In this embodiment, in order to better achieve white light mixing, the display time of one frame of image is t _FRAME divided into multiple multi-color light mixing time periods, and the white light mixing time is set to 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 reduced accordingly.

For a certain spatial light modulator display scheme, the time required to display the smallest bit is the minimum modulation time t _LSB , t _LSB is a parameter that can be configured when implementing light modulation in the projection system, generally according to the spatial light modulator The time response of mechanical motion is set to a fixed value, between ten microseconds to tens of microseconds, and different processes and structures have slight differences. However, in this embodiment, considering that t _LSB may have a non-integer number of t _LSB accumulation in the white light mixing sub-segment, t _{LSB is} based on the update frequency of the image signal source, the first light segment and the second light segment of each pixel. The gray 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, t _LSB is determined according to the following formula:

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

Among them, M _SBK1 and M _SBK2 are the short turn-off lighting in the sequential light source. Timing light sources can be roughly divided into two types: broad-spectrum 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 intercept the RGB color light from the light source and project it on the spatial light modulator to produce a two-dimensional grayscale pattern, and then project it onto the screen to achieve color display. In the working mode, due to the impure colors in the alternate areas of different colors, the projection system selectively does not project images on the screen, that is, the phenomenon of temporarily turning off the lighting.

The working mode of laser + fluorescent color wheel is similar to that of broad-spectrum light source + filter wheel. The difference is that the broad-spectrum light source is replaced by a blue laser, and the color wheel is replaced by a fluorescent color wheel with a wavelength conversion layer. Fluorescence can be used separately Red light and green light can also be used to intercept red light and green light from the generated yellow light using a color wheel.

The RGB LED light source and the RGB laser light source have similar working principles. The difference from the color wheel working mode 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. The field is usually realized by sequential control of the RGB LED or RGB laser drive current, that is, there is a short turn off lighting.

Further, M _Y and M _B can be determined according to the following methods:

Since the gray information in the signal is mostly expressed in binary form, the gray 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 n-bit information. 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 bits that the gray information of the first light segment is converted into binary data, and n _B is the number of bits that the gray information of the second light segment is converted into binary data, and M _Y N is one. The gray information of the first light segment data in the frame picture, M _B N is the gray 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 gray information bits of 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 the color matching, and the values of n _Y and n _B are made as large as possible, which can achieve a larger gray scale Modulation bits; the values of q _Y and q _B are as small as possible, which can reduce the influence 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 light modulation in the projection system. For example, in a DLP display, t _LSB is the flip time of a single mirror in a frame that controls the DMD (digital micromirror device, digital mirror) flipping from one state to another state. For example, suppose that the 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 lighting time is flipped 2^5=32 times, and the time required to complete each flip is (16.67ms)/(3*32)≈174us, which corresponds to the LSB flipping time, namely t _LSB .

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

In other embodiments, a liquid crystal switch device can also be used instead of 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 the time when the micro-mirror corresponding to the sub-segment in the DMD modulation mode is turned on is mapped to the transmittance of the liquid crystal to realize the adjustment of the gray scale.

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

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

Where M is the number of minimum modulation times corresponding to the first optical segment data M _Y or the number of minimum modulation times corresponding to the second optical segment data M _B in each sub-segment, and M _on is M _Y The number of M _B in the open state or the number of M _B in the open state.

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

example 1:

Use DMD modulator to display gray information.

Assuming that the update frequency of the image signal source is 60Hz, RGB are all 8-bit color gray scales, and a frame contains 8 sub-segments RGB mixed light into white light emission, then N=8, n _Y ＝n _B ＝8,

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

If a certain (R/G/B) 8-bit color corresponds to a gray scale of 0.5020 in a 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 white light mixed light emission in a frame, then 2 ⁸ =256 data can be divided into 8 32 data, and the display states of the corresponding mirrors are respectively, where "0" corresponds to the off state of the mirror, and "1" Corresponding to the open state of the mirror:

(00000000000000000000000000000000),

(11111111111111111111111111111111),

(11111111111111111111111111111111111).

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

(11111111111111111111111111111111),

(00000000000000000000000000000000),

(00000000000000000000000000000000).

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

Example 2:

Use liquid crystal switching device modulator to display grayscale information.

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

If a (R/G/B) 8-bit color corresponds to a gray scale of 0.5020 in a 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 a frame contains 8 segments of white light mixed light emission, then 2 ⁸ =256 data can be divided into 8 32 data, and the transmittances of the corresponding 8 sub-segment liquid crystal pixels are respectively

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

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 gray information by controlling the state of the DMD mirror or the transmittance of the liquid crystal, which is similar to that in the prior art by controlling the modulation time. The gray information is very different.

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

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

In this embodiment, a display method is proposed, which includes determining the minimum modulation time 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; mixing the first optical segment Data and the second light segment data to generate a corresponding display image. Through the above method, using a high-frequency light source and determining a specific t _LSB , the sampling frequency of the human eye is lower than the refresh frequency of the light source, and non-integer t _LSB accumulation is not generated, which can effectively reduce the rainbow effect and improve the image quality.

Further, in the foregoing 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, which is a schematic diagram of an optical path of an embodiment of the 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. The first light source 21 is used to generate yellow light, and the second light source 22 is used to generate blue light. Light, the first light modulator 23 is used to receive the yellow light segment light emitted by the first light source 21 and the blue light segment light emitted by the second light source 22, and receive control signals 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 a corresponding display image.

Further, the display system further includes an optical 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 beam splitter 25 decomposes the light of the yellow light segment into red light and green light, and is input to the first light modulator 23 and the second light modulator respectively. The light modulator 26 modulates to write red light segment data and green light segment data, the first light segment data is red light segment data or green light segment data, and the light combiner 24 is used to write the red light segment data And the green light segment data are synthesized into yellow light segment data, and further synthesized with the second light segment data to generate a corresponding projection image.

In order to better introduce the display system in this application, please refer to FIG. 5, which is a schematic diagram of the light path of another embodiment of the 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. Among them, the wavelength of the laser group 101 is preferably 465 nm, and the wavelength of the laser group 102 455nm is preferred to better realize the REC2020 color gamut standard. The current is controlled by the laser group controller 201 and the laser group controller 202 respectively. The control frequency is preferentially 1200Hz, that is, the control current waveform is approximately a square wave with a period of 1200Hz and a certain duty cycle, or even other waveforms that can realize current control. The ratio of the duty cycle preferentially selects RGB mixed light to achieve higher power white light as the principle. A preferred control waveform is shown in Figure 6, where the laser group 101 is in the off state and the laser group 102 is in the working state for the time periods corresponding to red (R:Red) and green (G:Green). For convenience, this This working state is referred to as "yellow light segment" in the following, and the time period corresponding to blue (B:Blue) and white (E:Empty), the 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 the "Blu-ray segment" below.

During the yellow light period, the blue laser light generated by the laser group 102 is incident on the yellow transmissive blue glass 301 and then reflected and incident on the rotating color wheel 401 covered with phosphor 402 to excite fluorescence. The generated yellow fluorescence is collected by the fluorescence collecting lens group 302, passes through the yellow and blue glass slide 301, and then enters the homogenizing element 303. The light homogenization element 303 can be a square rod or compound eyes or other devices that can realize the light homogenization function. After entering the relay lens group 304 for imaging, it enters the modulation surface of the spatial light modulator. The blue laser generated by the laser group 101 is incident on the yellow transmissive blue glass 301 and reflected to the homogenizing element 303.

A wavelength splitting prism 305 is also placed in the imaging light path, and a translucent, red-blue prism is preferably used. Therefore, the yellow light in the yellow light segment is split by the wavelength splitting prism 305 into red light and green light. Red light and green light enter two independent light paths. The wavelength splitting prism 305 preferentially uses a prism because it is considered that when the same element

triangular prisms

305 and 306 are used, the red light and the green light have the same optical path, which can save the cost of optical elements and structural parts. 305 can also use other wavelength splitting devices that can achieve similar functions, such as translucent, reflective, red and blue glass. Correspondingly, compensation for the optical path difference between red and green light should be considered, and different triangular prism thicknesses can be designed. After the red light and the green light are generated, the color filter can also be combined to modify the color to meet the display requirements of different color gamuts.

The red light and the green light respectively pass through

triangular prism groups

306 and 307 matched with the DMD to form uniform illumination on the modulation surfaces of the DMD501 and DMD502, and are emitted through the gray-scale modulation of the DMD, and are combined by the wavelength combining device 308. DMD501 and DMD502 are respectively used as a first modulator and a second modulator to modulate the received light, and are controlled by the controller 601 and the controller 602 to generate corresponding red light segment data and green light segment data.

The wavelength light combining device 308 may be a transmissive green reflecting red blue prism. The wavelength splitting element 305 and the wavelength combining element 308 preferentially select matching reflection and transmission spectrum characteristics to achieve higher light efficiency. The combined yellow light is projected onto the screen through the lens group 309.

During the blue light period, the laser group 101 is in a 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 yellow transmissive blue glass 301 into the yellow light path. The speckle eliminating element 301 may be a rotating wheel with a diffuser or other elements that can eliminate laser coherence, and the emitted blue light is preferentially designed to match the yellow fluorescence. The blue light entering the yellow light path enters the DMD501 after passing through the green and reflecting red and blue glass slide 305, is modulated by the DMD501, passes through the prism 306, the wavelength combining device 308 and the lens group 309, and then is projected onto the screen.

The yellow light segment and the blue light segment work alternately, and the rainbow effect is reduced by controlling the length of the time period. Specifically, it is realized by a spatial light modulator. After determining the various parameters according to the above formula, in order to display the gray information corresponding to each color, it is necessary to establish the mapping relationship between the gray level representation and the gray level display in each sub-segment. The specific mapping relationship needs to be determined according to the display principle of the spatial light modulator, and the method of using the spatial light modulator to realize light modulation according to t _LSB is similar to that in the foregoing embodiment, and will not be repeated here.

In this embodiment, the process of the generation and alternating operation of the yellow light segment and the blue light segment is described in detail. Through the high frequency alternating operation of the yellow light segment and the blue light segment, and the update frequency of the image signal source, the first The method of determining t _LSB based on the gray information of the light segment and the second light segment can improve the rainbow effect in the projected image and improve the projection quality.

This 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 optical segment data and the second optical segment data are written according to the minimum modulation time of each bit of data. The principles and steps of the steps of 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 U disk, 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 disk that can store program codes.

In summary, this application proposes a display method and display system, which can be applied not only to the projection system, but also to other display fields, to solve the rainbow problem in the displayed image.

The above are only implementations of this application, and do not limit the scope of this application. Any equivalent structure or equivalent process transformation made by using the description and drawings of this application, or directly or indirectly applied to other related technologies In the same way, all fields are included in the scope of patent protection of this application.

Claims

A display method, characterized by comprising:

Determine the minimum modulation time t LSB of each bit of data;

Writing the first optical segment data and the second optical 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 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 and the gray information of the first light segment and the second light segment of each pixel.
The method according to claim 1, wherein the minimum modulation time of each bit of data is determined according to the following formula:

Wherein, t LSB is the minimum modulation time of each bit of data, t FRAME is the display time of one frame of the image signal source, N is the number of white light mixing sub- segments in one frame of the image signal source, M SBK1 Is the number of the minimum modulation time of each bit of data included in the time period after the data of the second optical segment is written to before the data of the next first optical segment is written, and M Y is the number of minimum modulation times in 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 optical segment data, M SBK2 is the number of the minimum modulation time for each bit of data after the first optical segment data is written to the next second optical segment data writing the number of time before the minimum modulation period including each of the data, and M B of each white compounding photons per segment data write period of the second optical section data comprises the minimum modulation time Number.
The method according to claim 2, wherein the M Y and M B are determined according to the following manner:

Convert the gray 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 bits that the gray information of the first light segment is converted into binary data, and n B is the number of bits that the gray 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 one frame of picture, q Y is the correction factor of the first light segment, and q B is the second light segment. The correction factor of the segment.
The method according to claim 3, characterized in that it further comprises:

Convert the n-bit binary data [a 0 a 1 …a n-1 ] 2 corresponding to the gray information of the first light segment and/or the second light segment of each pixel in the image signal source into N Segments of M Y minimum modulation time first optical segment data and/or N segments of M B minimum modulation time second optical segment data.
The method of 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 pixel of a frame of picture includes N sub-segments, each sub-segment includes M Y pieces of first optical segment data of the minimum modulation time and M B pieces of the second optical segment data of the minimum modulation time, wherein the The binary data corresponding to the first light segment and the binary data corresponding to the second light segment are used to control the corresponding mirror to be turned on or off.
The method according to claim 4, wherein when a liquid crystal switch device is used as a spatial light modulator to write the first optical segment data and the second optical segment data, each pixel of a frame of picture includes N sub-segments, 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 liquid crystal The light transmittance of each liquid crystal switch in the switch device is written into the first optical segment data and the second optical segment data.
The method according to claim 6, wherein the light transmittance of each liquid crystal switch is:

Wherein, M is the minimum number of modulation times M Y corresponding to the first optical segment data or the number of minimum modulation times M B corresponding to the second optical segment data, and M on is the ON in M Y The number of states or the number of M B in the open state.
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.
A display system, which is 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 for generating light of the first light segment, and the second light source is used for 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. Control and write the first optical segment data and the second optical segment data, and the light combiner is used to mix the first optical segment data and the second optical segment data to generate a corresponding display image; The display system is used to execute the steps of the display method of any one of claims 1-8.
The display system according to claim 9, wherein the display system further comprises 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 beam splitter After that, the optical splitter splits the light of the first optical section into a third optical section and a fourth optical section, and respectively inputs them to the first optical modulator and the second optical modulator for modulation to write The third optical segment data and the fourth optical segment data are input, and the light combiner is used to synthesize the written third optical segment data and the fourth optical segment data, and further combine with the The second light segment data is synthesized to generate a corresponding display image.
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, the computer program realizes the determination of the display method according to any one of claims 1-7. The step of writing the first optical segment data and the second optical segment data according to the minimum modulation time t LSB of the bit data.