CN111491144B - Display method, display system and computer storage medium - Google Patents
Display method, display system and computer storage medium Download PDFInfo
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- CN111491144B CN111491144B CN201910081735.4A CN201910081735A CN111491144B CN 111491144 B CN111491144 B CN 111491144B CN 201910081735 A CN201910081735 A CN 201910081735A CN 111491144 B CN111491144 B CN 111491144B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
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- H—ELECTRICITY
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- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
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Abstract
The application discloses a display method, which comprises the following steps: determining a minimum modulation time of each bit of data; writing first optical segment data and 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 signal source, and the gray scale information of the first light segment and the second light segment of each pixel. By the mode, the display method can effectively improve the rainbow effect in the display image and improve the display quality by determining the minimum modulation time of each bit of data.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a display method, a display system, and a computer storage medium.
Background
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 an RGB time-sequential illumination projection system, the phenomenon of RGB color misalignment occurs at the edges of a color image, which is called the rainbow effect. The rainbow effect is caused because the RGB sub-frame images displayed in time series cannot be overlapped at the image forming position on the retina of human eyes in one image frame, which is more obvious for a color image moving on a screen. The reason for the RGB color sub-frame misalignment on the retina may be the movement of the eyeball, or the existence of a light path switch in the imaging light 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 capturing devices, such as cameras or high-speed video cameras, also have an image sampling frequency, and when the sampling frequency is greater than or approximately equal to the illumination light field refresh frequency (at most 3 × 60= 180hz), the different color subframe images will be captured separately, so that the time-integration effect of the primary color mixing is deteriorated, and thus the rainbow effect occurs.
To summarize, the rainbow effect may involve two broad categories of problems. The first is the separation of different colors at the edges of the (still or moving) image, and the second is that the monochromatic illumination light field of the whole image is sampled individually, and the light mixing effect of the primary colors is split. The key crux of both problems is that the refresh frequency of the time-sequential monochromatic illumination field in projection systems is low (typically 180 Hz).
Disclosure of Invention
The application provides a display method, a display system and a computer storage medium, which are used for improving rainbow effect of projection display in the prior art.
In order to solve the above technical problem, the present application provides a display method, including determining a minimum modulation time of each bit of data; writing first optical segment data and 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 an update frequency of the image signal source, and gray scale information of the first light segment and the second light segment of each pixel.
In order to solve the above technical problem, the present application provides a display system, which includes a first light source, a second light source, a first light modulator, and a light combiner; the display system comprises a first light source, a second light source, a first light modulator, a light combiner and a display system, wherein the first light source is used for generating light of a first light section, the second light source is used for generating light of a second light section, the first light modulator is used for receiving the light of the first light section emitted by the first light source and the light of the second light section emitted by the second light source, receiving control signals and writing the data of the first light section and the data of the second light section into the light modulator, and the light combiner is used for mixing the data of the first light section and the data of the second light section to generate a corresponding display image.
In order to solve the above technical problem, the present application proposes a computer storage medium, in which a computer program is stored, and the computer program, when executed by a processor, implements the method for determining the minimum modulation time t for each bit of data in the above display method LSB And writing the first optical segment data and the second optical segment data according to the minimum modulation time of each bit of data.
The application provides a display method, which comprises the steps of 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 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 an update frequency of the image signal source, and gray scale information of the first light segment and the second light segment of each pixel. According to the method, the minimum modulation time of each bit of data is determined according to the updating frequency of the image signal source and the gray scale information of the first light segment and the second light segment of each pixel, the spatial light modulator is adjusted according to the determined minimum modulation time of each bit of data, and the first light segment data and the second light segment data are written in.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart diagram illustrating an embodiment of a display method of the present application;
FIG. 2 is a diagram illustrating timing control in a frame of a video according to the present application;
FIG. 3 is a schematic optical path diagram of an embodiment of a display system of the present application;
FIG. 4 is a schematic optical path diagram of another embodiment of the display system of the present application;
FIG. 5 is a schematic optical path diagram of yet another embodiment of the display system of the present application;
FIG. 6 is a control diagram of the time-sequenced light source of FIG. 5.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present application, a display method and a display system provided by the present invention are further described in detail below with reference to the accompanying drawings and the detailed description.
The display method, the display system and the computer storage medium mainly solve the rainbow effect in projection display, and the rainbow effect relates to two main problems. The first is that the edge of the still or moving image has different color separation, the second is that the single color illumination light field of the whole image is sampled separately, and the light mixing effect of the primary colors is divided. The key culmination of both types of problems is the low refresh frequency of time-sequential monochromatic illumination fields in display systems. Therefore, it is necessary to reduce the rainbow effect by using the high refresh frequency of the light source, and based on this, the present application provides a display method and a display system, which can be applied to a plurality of display fields, and the present application is described below with respect to the projection technology field.
Referring to fig. 1, fig. 1 is a schematic flow chart of an embodiment of a display method of the present application, wherein the display method includes:
s11: determining a minimum modulation time (t) for each bit of data LSB )。
In this embodiment, a light source with a high refresh rate is used as a light source of a projection system, and the projection system of the present application uses the light source to input light of a first light segment (for example, a yellow light segment) and light of a second light segment (for example, a blue light segment) in a time sequence manner, and uses a light modulator to modulate the light into first light segment data and second light segment data, respectively, and mixes the first light segment data and the second light segment data to generate a corresponding image. Further, it will be understood by those skilled in the art that the yellow light of the first light segment may be further decomposed into red light of a red light segment and green light of a green light segment, which may be modulated into red light segment data and green light segment data, respectively, using a light modulator, and then the red light segment data, the green light segment data, and the blue light segment data of the second light segment are mixed, thereby generating corresponding images. That is, the present embodiment mainly generates RGB data by inputting light of the first light segment and light of the second light segment in time series and then modulating them, thereby displaying corresponding images.
Typically, a frame of image in a projection system is displayed for a time t FRAME In the embodiment of 2D display, there are multiple frames of images within 1 second, the continuous playing of the multiple frames of images forms a dynamic picture, each frame of image corresponds to one image to be displayed, each image to be displayed corresponds to one display time interval, and the display time interval is the time interval to be displayedThe modulation periods of an image, in other words, for a display device for 2D display, one modulation period for one image to be displayed. In an embodiment of 3D display, there are multiple frames of images within 1 second, and continuous playing of the multiple frames of images forms a dynamic 3D picture, where each frame of 3D image corresponds to two images to be displayed, each image to be displayed corresponds to a display period, and the display period is a modulation period of the image to be displayed, in other words, for a display device for 3D display, one frame of image to be displayed corresponds to two continuous modulation periods. In this embodiment, to better realize white light mixing, the time for displaying one frame of image is t FRAME Dividing into multiple multicolor light mixing time periods, and setting the time of one white light mixing as t WHITE Wherein
N is the number of the emergent white light mixing subsections in one frame of picture of the image signal source, and it can be expected that when N is more than 1, the frequency of the white light mixing of the image signal source is changed to be N times of the original frequency, and the rainbow effect is correspondingly weakened.
For a certain spatial light modulator display scheme, the time required to display the smallest bit is denoted as the minimum modulation time t LSB ，t LSB The parameters which can be configured when the light modulation is realized in the projection system are generally set as fixed values according to the time response of the mechanical motion of the spatial light modulator, and different processes and structures are slightly different from each other within ten microseconds to dozens of microseconds. In the present embodiment, however, t is considered LSB A non-integer number t may occur in the white light mixing subsegment LSB Cumulative problem, t LSB According to the update frequency of the image signal source and the gray scale information of the first light segment and the second light segment of each pixel, the display time of one frame is determined corresponding to the minimum modulation time t LSB The integral multiple of the color wheel, and in addition, the critical display problem among different color segments of the color wheel is also considered in the embodiment, so that the projection system has higher display effect.
Specifically, t is determined according to the following formula LSB ：
In the formula, t LSB For minimum modulation time, t, of each bit of data FRAME The display time of one frame of picture, N is the number of emergent white light mixed sub-segments in one frame of picture of the image signal source, M SBK1 The minimum modulation time number M of each bit of data included in the time period from the second optical segment data writing to the next first optical segment data writing Y The number of minimum modulation time of each bit of data contained in the time period for writing the first light section data in each white light mixed light section, M SBK2 M is the number of minimum modulation time of each bit of data included in the time period from the writing of the first optical segment data to the writing of the next second optical segment data B And the number of the minimum modulation time of each bit of data contained in the time period for writing the second light section data in each white light mixed light section. Referring to fig. 2, fig. 2 is a schematic diagram illustrating timing control in a frame of the present application.
Wherein M is SBK1 And M SBK2 For a brief turn-off of the illumination in a time-sequential light source. Time-sequential light sources can be broadly divided into two categories: a broad spectrum light source + a filter color wheel, a laser + a fluorescent color wheel, an RGB LED light source or an RGB laser light source. The wide-spectrum light source + filtering color wheel mode utilizes a color wheel rotating at high speed to intercept RGB color light from a light source in a time sequence and project the RGB color light onto a spatial light modulator to generate a two-dimensional gray pattern, and then the two-dimensional gray pattern is projected onto a screen to realize color display.
The working mode of the laser and fluorescent color wheel is similar to that of the wide-spectrum light source and the filter wheel, and the difference is that the wide-spectrum light source is changed into blue laser, the color wheel is changed into the fluorescent color wheel with a wavelength conversion layer, and the fluorescent light can adopt independent red light and green light, and can also intercept the red light and the green light from the generated yellow light by using the color wheel.
The RGB LED light source and the RGB laser light source have similar working principles, and are different from a color wheel working mode in that RGB color light is generated by adopting an independent LED or laser, the RGB color light is independently processed in a time sequence in a time division multiplexing mode, and a time sequence light field is usually realized by controlling the on-off of driving currents of the RGB LED or the RGB laser in a time sequence mode, namely, illumination is turned off temporarily.
Further, M Y And M B May be determined according to the following:
since the gray scale information in the signal is mostly represented in binary form, the gray scale information x e [0,1 ] of the first light segment and/or the second light segment of each pixel in the image signal source]Into binary data [ a ] having n bits 0 a 1 …a n-1 ] 2 Wherein, in the process,
m is then determined according to the following formula Y And M B ：
Wherein n is Y N is the number of bits that the gray scale information of the first light segment has converted into binary data B For converting the gray scale information of the second light segment into binary data having a bit number, M Y N is the gray scale information of the first light segment data in one frame, M B N is the gray scale information of the second light segment data in one frame picture, q Y Is a correction factor of the first optical segment, q B The correction factor is a correction factor of the second light segment, can adjust the gray information bit number of the first light segment and the second light segment, and can realize integer output of minimum modulation time according to the refreshing frequency of the image signal source. In this example M SBK1 ,M Y ,M SBK2 ,M B The value of N is preferably combined to satisfy the white balance of color matching, and N is enabled to be Y And n B The value of (a) is as large as possible, which can realize larger gray modulation digit; q. q of Y And q is B The value of (a) is as small as possible, which can reduce the influence on the restoration of the image signal source information.
S12: according to t LSB And writing the first optical segment data and the second optical segment data.
From the above formula, t can be determined LSB ，t LSB For implementing light modulation in a projection system. For example, if in DLP display, t LSB To control the flip time for a single mirror to flip from one state to another state in a frame on a DMD (digital micromirror device). For example, it is assumed that the DMD can realize 15-bit RGB display within one frame (1/60 = 16.67ms), and RGB three color timings are uniformly distributed, i.e., one color sub-frame can realize 5-bit gray scale display. The color illumination time is turned over for 2^5=32 times, the time required for finishing each turning is (16.67 ms)/(3 x 32) ≈ 174us, and the corresponding time of LSB turning, namely 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, one frame of picture is divided into N subsections, each subsection includes M Y Data sum M of first optical segment of minimum modulation time B Second optical segment data of minimum modulation time, M Y Data sum of first optical segment of minimum modulation time B The second optical segment data for each minimum modulation time may be used to control the respective mirror on state or off state. Using M in the first light segment Y *t LSB To achieve the front (M) in the color gray binary representation Y -1) data, M in the first yellow segment B *t LSB To achieve a front (M) in a color gray scale binary representation B -1) data, using M in the second first optical segment Y *t LSB To achieve the second M in the color gray binary representation Y A data, a second light segment M B *t LSB To achieve the second M in the color gray binary representation B Individual data, \8230 \ 8230;, and so on, through display of RGB, q corresponding to the first light segment data in the last several sub-segments Y Setting the minimum modulation time data as 0, and setting q corresponding to the second optical segment data in the last several sub-segments B The minimum modulation time data is set to 0.
In other embodiments, liquid crystal switching devices may be used as the spatial light modulator instead of the DMD. The modulation principle of the liquid crystal switching device is similar to that of the DMD, and the difference is that the time of the starting state of the micro-reflector corresponding to the subsection in the DMD modulation mode is mapped to the transmittance of the liquid crystal to realize the gray level adjustment.
In particular, in embodiments using liquid crystal switching device modulation, t LSB The time for single display of three colors of RGB. When the first light segment data and the second light segment data are alternately written using the liquid crystal switching device as the spatial light modulator, each pixel of one frame of picture includes N sub-segments each including a segment M Y First optical segment data and segment M of minimum modulation time B Second optical segment data of a minimum modulation time, and writing the first optical segment data and the second optical segment data by controlling a light transmittance of each liquid crystal switch in the liquid crystal switch device;
wherein, the light transmittance of each liquid crystal switch is:
wherein M is the number M of the minimum modulation time corresponding to the first optical segment data in each sub-segment Y Or the number M of minimum modulation times corresponding to the second optical segment data B And M is on Is M Y Number of in-on state or M B The number of on states in (1).
In order to better understand the method of modulating light in the above embodiments, two specific examples are given below:
example 1:
gray scale information is displayed using a DMD modulator.
Assuming that the update frequency of the image signal source is 60Hz, RGB is 8-bit color gray, and a frame contains 8 sub-segments RGB mixed light to be emitted as white light, N =8, N Y ＝n B ＝8,
Get M SBK1 ＝M SBK2 If =5, t can be obtained LSB ＝28.1531us，q Y ＝q B ＝0。
If a (R/G/B) 8-bit color corresponds to a gray level of 0.5020 in a frame, the corresponding binary number is 0.5020 (2) from the least significant bit to the most significant bit 8 -1)＝128＝[00000001] 2 . If a frame contains 8 segments of mixed white light, 2 8 =256 pieces of data can be divided into 8 pieces of 32 data, and the display states of the corresponding mirrors are, respectively, where "0" corresponds to the off state of the mirror, and "1" corresponds to the on state of the mirror:
(00000000000000000000000000000000)、
(00000000000000000000000000000000)、
(00000000000000000000000000000000)、
(00000000000000000000000000000000)、
(11111111111111111111111111111111)、
(11111111111111111111111111111111)、
(11111111111111111111111111111111)、
(11111111111111111111111111111111)。
in other embodiments, the binary number corresponding to a (R/G/B) 8-bit color in a frame may also be from the most significant bit to the least significant bit, i.e., [11111110 ]] 2 The display states of the corresponding reflectors are respectively:
(11111111111111111111111111111111)、
(11111111111111111111111111111111)、
(11111111111111111111111111111111)、
(11111111111111111111111111111111)、
(00000000000000000000000000000000)、
(00000000000000000000000000000000)、
(00000000000000000000000000000000)、
(00000000000000000000000000000000)。
in the above embodiment, the minimum modulation time of each mirror is calculated according to the parameters, and the display state of the mirror in a corresponding frame of picture is calculated. It should be noted that the above embodiments only show two ways of mirror states, and in other embodiments, those skilled in the art may set the mirror display states corresponding to 8 32 data as other binary data.
Example 2:
the grey scale information is displayed using a liquid crystal switching device modulator.
Assuming that the update frequency of the image signal source is 60Hz, RGB is 8-bit color gray, and a frame contains 8 sub-segments of RGB mixed light to emit white light, N =8, N Y ＝n B ＝8,
Get M SBK1 ＝M SBK2 If =5, t can be obtained LSB ＝28.1531us，q Y ＝q B ＝0。
If a (R/G/B) 8-bit color corresponds to a gray scale of 0.5020 in a frame, the corresponding binary number is 0.5020 from the least significant bit to the most significant bit (2) 8 -1)＝128＝[00000001] 2 . If a frame contains 8 segments of mixed white light, 2 8 The number of the data is =256, the data can be divided into 8 32 data, and the transmittance of the liquid crystal pixel corresponding to 8 sub-segments is respectively
In example 2, the display of gradation information using a liquid crystal switching device modulator is described, and similarly to example 1, the binary number corresponding to the gradation may be from the most significant bit to the least significant bit, i.e., [11111110 ]] 2 The transmittance of the corresponding liquid crystal pixel is
As can be seen from the above-mentioned several implementations, the display method of the present application fixes the minimum modulation time, and represents the gray scale information by controlling the state of the DMD mirror or the transmittance of the liquid crystal, which is different from the prior art that represents the gray scale information by controlling the modulation time.
S13: the first light segment data and the second light segment data are mixed to generate a corresponding display image.
And projecting the modulated first light segment data and the modulated second light segment data onto a screen, and generating corresponding colored projection images through light mixing to realize the whole projection process.
The embodiment provides a display method, which comprises the steps of 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 a minimum modulation time of each bit of data; the first light segment data and the second light segment data are mixed to generate a corresponding display image. In this way, a high frequency light source is utilized and a specific t is determined LSB The sampling frequency of human eyes is lower than the refresh frequency of the light source, and non-integer t is not generated LSB Accumulation can effectively weaken the rainbow effect and improve the 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. Referring 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 comprises 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 for generating light of a yellow light section, the second light source 22 is used for generating light of a blue light section, the first light modulator 23 is used for receiving the light of the yellow light section emitted by the first light source 21 and the light of the blue light section emitted by the second light source 22 and receiving the control of a control signal to alternately write first light section data and second light section data, and the light combiner 24 is used for combining the first light section data and the second light section data to generate a corresponding display image.
Further, the display system further includes a beam splitter 25 and a second light modulator 26, please refer to fig. 4, and fig. 4 is a schematic optical path diagram of another embodiment of the display system of the present application. After the light of the yellow segment generated by the first light source 21 is input to the light splitter 25, the light splitter 25 splits the light of the yellow segment into red light and green light, and the red light and the green light are respectively input to the first light modulator 23 and the second light modulator 26 for modulation so as 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 for synthesizing the written red light segment data and green light segment data into yellow light segment data, and further synthesizing the yellow light segment data with the second light segment data so as to generate a corresponding projection image.
For better description of the display system of the present application, please refer to fig. 5, and fig. 5 is a schematic optical path diagram of another embodiment of the display system of the present application.
The laser group 101 and the laser group 102 are respectively used as a first light source and a second light source for generating 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 is preferably 455nm, so that the REC2020 color gamut standard is better realized in the aspect. The current is controlled by the laser group controller 201 and the laser group controller 202 respectively, the control frequency preferably adopts 1200Hz, namely the control current waveform is approximately a square wave with a period of 1200Hz and a certain duty ratio, even other waveforms capable of realizing current control. The proportion of the duty ratio preferably selects RGB mixed light to realize white light with larger power as a principle. A preferred control waveform is shown in fig. 6, in which the laser groups 101 are in an off state for the time segments corresponding to Red (R: red) and Green (G: green), the laser groups 102 are in an operating state, which is referred to as "yellow segment" hereinafter for convenience, and the laser groups 101 are in an operating state for the time segments corresponding to Blue (B: blue) and white (E: empty), the laser groups 102 are in an off state, which is referred to as "Blue segment" hereinafter.
In the yellow period, blue laser light generated by the laser group 102 is incident on the yellow-transmitting and blue-reflecting glass sheet 301 and then reflected to be incident on the rotating color wheel 401 with the surface covered with the phosphor 402 to excite fluorescence. The generated yellow fluorescence is collected by the fluorescence collection lens group 302 and transmitted through the yellow-transmitting anti-blue glass 301, and then enters the light uniformizing element 303. The light homogenizing element 303 can be a square rod or a compound eye or other devices capable of realizing the light homogenizing function. Then enters the relay lens group 304 for imaging and then enters the modulation surface of the spatial light modulator. And blue laser light generated by the laser group 101 is incident on the yellow-transmitting and blue-reflecting glass sheet 301 and is reflected to the dodging element 303.
A wavelength splitting prism 305 is also arranged in the imaging light path, and a green-transmitting and red-blue-reflecting prism is preferably adopted. Accordingly, the yellow light of the yellow segment is decomposed into red and green light by the wavelength splitting prism 305. The red and green light enters two separate optical paths. The prism is preferably used for the wavelength dispersion prism 305 because the cost of opening the optical elements and the structure can be saved in consideration of the fact that the red light and the green light have the same optical path when the same triangular prism is used. Other wavelength splitting devices that can achieve similar functions, such as a green-transparent and red-blue-reflective glass slide, can also be used 305, and accordingly, the method of designing different triangular prism thicknesses can be adopted in consideration of compensating the optical path difference of red light and green light. After the red light and the green light are generated, the colors can be correspondingly modified by combining with a color filter to meet the requirements of different color gamut display.
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 modulation surfaces of the DMD501 and the DMD502, are emitted through gray scale modulation of the DMD, and are combined by a wavelength light-combining device 308. The DMD501 and the DMD502 serve as a first modulator and a second modulator, respectively, to modulate received light, and are controlled by a controller 601 and a controller 602 to generate corresponding red segment data and green segment data.
The wavelength light combining device 308 may be a green-transparent and red-blue-reflective prism. The wavelength splitting element 305 and the wavelength combining element 308 preferably have matched reflection and transmission spectrum characteristics to achieve high light efficiency. The mixed yellow light after light combination is projected onto a screen through the lens group 309.
During the blue light period, the laser assembly 101 is in operation, the system generates blue illumination, and the generated blue laser light is reflected by the yellow-transmitting anti-blue glass sheet 301 into the yellow light path after passing through the laser-eliminating speckle component 310. Speckle-dispersing element 301 may be a rotating wheel with a diffuser or other element that achieves laser coherence elimination, and the illumination of the emitted blue light is preferably designed to match the yellow fluorescence. Blue light entering a yellow light path enters the DMD501 after passing through the green-light-transmitting and red-light-reflecting glass slide 305, is modulated by the DMD501, then passes through the triangular prism group 306, the wavelength light-combining device 308 and the lens group 309, and then is projected onto a screen.
The yellow light section and the blue light section work alternately, and the rainbow effect is weakened by controlling the length of the time section. In particular, this is achieved by a spatial light modulator. After determining each parameter according to the above formula, in order to display the gray scale information corresponding to each color, a mapping relationship between the gray scale representation and the gray scale display in each sub-segment needs to be established. The specific mapping relation needs to be determined according to the display principle of the spatial light modulator, and the spatial light modulator is utilized according to t LSB The method for implementing the light modulation is similar to that in the above embodiments, and is not described herein again.
In this embodiment, the generation of the yellow and blue light segments and the process of the alternate operation are described in detail, and t is determined by the alternate operation of the yellow and blue light segments at high frequency and according to the update frequency of the image signal source, the gray scale information of the first and second light segments of each pixel LSB By the method, the rainbow effect in the projected image can be improved, and the projection quality is improved.
The present application also includes a computer storage medium. The computer storage medium stores a computer program which, when executed by a processor, implements the above-described method of determining a minimum modulation time t for each bit of data LSB And according to each bit of dataThe steps of any embodiment of writing the first optical segment data and the second optical segment data with the minimum modulation time are similar in principle and steps, and are not described herein again. The computer storage medium may be disposed in a controller of the spatial light modulator described above. Further, the computer storage medium may be various media that can store program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic tape, or an optical disk.
In summary, the present application provides a display method and a display system, which can be applied to not only a projection system, but also other display fields, so as to solve the rainbow problem occurring in the display image.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (11)
1. A display method, comprising:
determining a minimum modulation time t for each bit of data LSB ；
Writing first optical segment data and second optical segment data alternately 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 gray scale information of the first light segment and the second light segment of each pixel, and the short-time off illumination of the time sequence light source.
2. The method of claim 1, wherein the minimum modulation time for each bit of data is determined according to the following formula,
wherein, t LSB For minimum modulation time, t, of said data per bit FRAME The display time of a frame of picture of an image signal source is obtained, N is the number of emergent white light mixed subsegments in the frame of picture of the image signal source, and M is the display time of the frame of picture of the image signal source SBK1 The number of minimum modulation time, M, of each bit of data included in the time period from the second optical segment data writing to the next first optical segment data writing Y The number of minimum modulation time of each bit of data contained in the time period for writing the first light section data in each white light mixed light section, M SBK2 M is the number of minimum modulation time of each bit of data included in the time period from the first optical segment data writing to the next second optical segment data writing B And the number of the minimum modulation time of each bit of data contained in the time period for writing the second light section data in each white light mixed light section.
3. The method of claim 2, wherein M is Y And M B Is determined according to the following way:
the gray scale information x epsilon [0,1 ] of the first light segment and/or the second light segment of each pixel in the image signal source]Into binary data [ a ] having n bits 0 a 1 …a n-1 ] 2 Wherein, in the step (A),
m is then determined according to the following formula Y And M B ：
Wherein n is Y N is the number of bits that the gray scale information of the first light segment has converted into binary data B For converting the gray scale information of the second light segment into binary data having a bit number M Y N is the number of bits of the first optical segment data in one frame, M B N is the number of bits of the second optical segment data in one frame, q Y Is a correction factor of the first optical segment, q B Is a correction factor for the second optical segment.
4. The method of claim 3, further comprising:
n bits of binary data [ a ] corresponding to the gray scale information of the first light segment and/or the second light segment of each pixel in the image signal source 0 a 1 …a n-1 ] 2 Respectively converted into N segments M T First optical segment data of minimum modulation time and/or N segments M B Data of a second optical segment of the minimum modulation time.
5. The method of claim 4, wherein each pixel of a frame of picture comprises N subsections, each subsection comprising M, when the first light segment data and the second light segment data are written using a digital mirror as a spatial light modulator Y A first optical segment data sum M of the minimum modulation time B And the second optical segment data of the minimum modulation time, wherein the binary data corresponding to the first optical segment and the binary data corresponding to the second optical segment in each sub-segment are used for controlling the corresponding mirror to be turned on or off.
6. The method according to claim 4, wherein each pixel of a frame of picture comprises N subsections when the first light segment data and the second light segment data are written using a liquid crystal switching device as a spatial light modulator, each subsection comprising a segment M Y The first optical segment data sum M of the minimum modulation time B Said minimum modulation timeSecond optical segment data, and the first optical segment data and the second optical segment data are written by controlling the light transmittance of each liquid crystal switch in the liquid crystal switch device.
7. The method of claim 6, wherein the light transmittance of each liquid crystal switch is:
wherein M is the minimum modulation time number M corresponding to the first optical segment data Y Or the number M of the minimum modulation time corresponding to the second optical segment data B And M is on Is M Y Number of middle in on state or M B The number of on states in (1).
8. The method of 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 comprising 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 a first light section, the second light source is used for generating light of a second light section, the first light modulator is used for receiving the light of the first light section emitted by the first light source and the light of the second light section emitted by the second light source, receiving control signals and writing the first light section data and the second light section data, and the light combiner is used for mixing the first light section data and the second light section data to generate a corresponding display image; the display system is adapted to perform the steps of the display method of any of claims 1-8.
10. The display system according to claim 9, further comprising an optical splitter and a second optical modulator, wherein after the light of the first light segment generated by the first light source is input to the optical splitter, the optical splitter splits the light of the first light segment into a third light segment and a fourth light segment, and the third light segment data and the fourth light segment data are respectively input to the first optical modulator and the second optical modulator for modulation, and the optical combiner is configured to combine the written third light segment data and the written fourth light segment data, and further combine the third light segment data and the written fourth light segment data with the second light segment data to generate a corresponding display image.
11. A computer storage medium, characterized in that the computer storage medium stores a computer program which, when executed by a processor, implements the determination of the minimum modulation time t per bit of data in a display method according to any one of claims 1 to 7 LSB And writing the first optical segment data and the second optical segment data according to the minimum modulation time of each bit of data.
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| CN201910081735.4A CN111491144B (en) | 2019-01-28 | 2019-01-28 | Display method, display system and computer storage medium |
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| US20100079685A1 (en) * | 2003-11-01 | 2010-04-01 | Taro Endo | Spatial light modulator performing a gamma correction |
| RU2420024C2 (en) * | 2006-02-22 | 2011-05-27 | Конинклейке Филипс Электроникс Н.В. | Method of projecting colour images using light spatial modulation and light source spatial modulation |
| CN101490736A (en) * | 2006-07-12 | 2009-07-22 | 硅探索株式会社 | A color display system for reducing a false color between each color pixel |
| US20080158437A1 (en) * | 2006-12-27 | 2008-07-03 | Kazuma Arai | Method for displaying digital image data and digital color display apparatus |
| CN102298903B (en) * | 2010-06-28 | 2016-03-16 | 石井房雄 | Use the display device of light-pulse generator |
| US9429760B2 (en) * | 2014-10-07 | 2016-08-30 | Christie Digital Systems Usa, Inc. | Spatial color mixing in a cascade imaging system |
| CN105988272B (en) * | 2015-02-15 | 2019-03-01 | 深圳光峰科技股份有限公司 | Optical projection system and its control method |
| CN106154714B (en) * | 2015-04-09 | 2018-11-13 | 深圳市光峰光电技术有限公司 | A kind of method and optical projection system of spatial light modulator modulation data |
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