CN116564245A - Multi-partition light source projection device, system and control method based on time domain - Google Patents
Multi-partition light source projection device, system and control method based on time domain Download PDFInfo
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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- G02F1/1336—Illuminating devices
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- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
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- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
- G03B21/006—Projectors using an electronic spatial light modulator but not peculiar thereto using LCD's
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- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
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- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
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- G09G3/3413—Details of control of colour illumination sources
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
The invention relates to a multi-partition light source projection device, a system and a control method based on a time domain, wherein the device comprises a multi-partition light source plate module and a multi-partition light source control plate; the multi-partition light source plate module comprises a substrate, wherein a lamp bead array is arranged on the substrate, and a minimum lamp bead unit forming the lamp bead array comprises lamp beads with three colors of red, green and blue; fine switching control of each light source area on the multi-partition light source plate module is realized; the invention provides a brand new light source projection mode, creatively combines a partition backlight control technology with a time domain control technology of lamp bead colors, and compared with the traditional single light source scheme and color liquid crystal panel scheme, the theoretical value of brightness of the scheme can be improved by 2-3 times, contrast ratio can be improved by more than fifty percent, color gamut can be improved by more than twenty percent, and the aim of breaking technical blockage of three-piece liquid crystal screen type projection is fulfilled.
Description
Technical Field
The present invention relates to the field of projection technologies, and in particular, to a multi-partition light source projection device, system and control method based on a time domain.
Background
With the development of projection technology, the liquid crystal panel is continuously updated, the brightness of the light source is continuously improved, the sound is better, the experience is obviously improved greatly, and more projections are taken into thousands of households. The single light source projection is realized by the principle that the light source passes through the screen and a specific light path, and finally, the image is projected onto the curtain through the lens. The characteristic of the single light source is that the closer to the light source is, the brighter the single light source is, so that the common single light source projection is bright in the middle, the periphery is relatively dark, and the picture brightness cannot be uniform; the projection picture is obtained through various optical special effect lens arrays and color liquid crystal panels, and in the working process, a single light source needs to be kept normally bright, and absolute black is difficult to achieve when the normally bright light source is in a dark field, so that an image cannot be completely and truly restored, the contrast is to be improved, and the power consumption is constant; meanwhile, when a single light source is projected in production, assembly and use, if dust falls on a screen or a light path device, obvious black spots can appear on a picture. For this reason, it is important to solve the above problems by optimizing the light source.
At present, the projection devices on the market are divided into three types according to the imaging principle, one type is a single light source and single-chip color liquid crystal projection technology, and the projection devices pass through a color liquid crystal screen through a single white super-bright light source and are imaged through various optical devices. The second is that three light sources are matched with three single-color liquid crystal screens, three light sources with three colors of red, green and blue are respectively irradiated on the three single-color liquid crystal screens to obtain images with three colors of red, green and blue, and then a lens array is used for imaging. The third is to use DLP mode of the american TI company, where the three lamps red, green and blue are imaged by the DMD, or the white light source is divided into three colors of red, green and blue by a color wheel, and then imaged by the DMD in synchronization. The single light source and single liquid crystal screen type projection has obvious improvement in brightness and resolution in recent years, and has low price, large market share and quick growth, but has no obvious improvement in uniformity of picture brightness, is always bright in the middle, has relatively dark periphery, is difficult to be well focused, and in the working process, the single light source needs to be kept normally bright, absolute black (dark gray and light gray are common in dark fields) is difficult to be realized when the normally bright light source is in dark fields, and the contrast ratio is also unsatisfactory; in the processing and using processes, dust falls on a screen or an optical path device, and the dust is difficult to clean; meanwhile, the light transmittance of the color liquid crystal panel is very low, and the brightness of the whole projection device can be improved only by increasing the power of a light source, but the power consumption is increased and the temperature is greatly improved. Although the three lamps in the DLP mode have relatively good experience on the uniformity of brightness and focusing of the picture, the three lamps are hard wounded on price and contrast, dust has larger influence on black spots of the picture, and the requirements on production environment are higher; in addition, the laser light source is relatively effective, but is costly. Three liquid crystal display type projection has high cost and difficult light path design, and meanwhile, the patent is easy to be clamped in the foreigner's hands. Therefore, the invention discloses a novel light source projection device which is autonomous, controllable, reliable, good in contrast, high in brightness and reasonable in power consumption, and the novel light source projection device is a problem to be solved by a person skilled in the art.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a multi-partition light source projection device based on a time domain, a multi-partition light source projection system based on the time domain and a multi-partition light source projection control method based on the time domain aiming at the defects of the prior art.
The technical scheme adopted for solving the technical problems is as follows:
constructing a multi-partition light source projection device based on a time domain, wherein the multi-partition light source projection device comprises a multi-partition light source plate module and a multi-partition light source control plate;
the multi-partition light source plate module comprises a substrate, wherein a lamp bead array is arranged on the substrate, and a minimum lamp bead unit forming the lamp bead array comprises lamp beads with three colors of red, green and blue;
the multi-partition light source control board receives the digital signal and converts the data in the digital signal into RGB data of each pixel in the video picture and a video synchronization signal; generating pixel control signals in each frame of picture according to the video synchronization signals; dividing the whole area light source of the multi-partition light source plate module into a plurality of light source areas, analyzing RGB data of each pixel, calculating optimal brightness data of each area in the whole video picture, and controlling output power of each corresponding light source area according to the optimal brightness data; performing enhancement control on the brightness of a dark light source area in the multi-partition light source plate module; transmitting the related data of the output power to the light source driving chips of all the affiliated partitions for driving control so as to obtain the final actual brightness; the pixel control signals are transmitted to the liquid crystal panel for data processing, RGB display data of pixels are sequentially transmitted to the monochromatic liquid crystal panel for data processing according to the sequence of red, green and blue, and synchronous control signals in the pixel control signals also simultaneously control RGB lamp beads on the multi-partition light source plate module, namely, the liquid crystal panel respectively displays each frame of RGB, and meanwhile, the RGB lamp beads on the multi-partition light source plate module are accurately controlled in switching and brightness according to the same color.
The invention discloses a time domain-based multi-partition light source projection device, which comprises a front lens group, a grating and a rear lens group, wherein the multi-partition light source plate module, the front lens group, the grating and the rear lens group are sequentially arranged;
the front lens group is used for carrying out light collimation and light homogenization treatment on light rays emitted by the multi-partition light source plate module;
the grating is used for filtering light rays which are not parallel to the light path;
the rear lens group is used for performing diffusion treatment on the light passing through the grating.
The multi-partition light source projection device based on the time domain provided by the invention further comprises a single-color liquid crystal panel, wherein the rear lens group and the single-color liquid crystal panel are sequentially arranged.
The multi-partition light source projection device based on the time domain provided by the invention further comprises a Fresnel lens and a lens, wherein the monochromatic liquid crystal panel, the Fresnel lens and the lens are sequentially arranged.
The multi-partition light source projection system based on the time domain is applied to the multi-partition light source projection device based on the time domain, and comprises a signal receiving module, a pixel control signal generating module, an initial brightness calculating module, a dark area enhancing module, a spatial filtering module, a time filtering module, a power control module and a signal sending module;
the signal receiving module is used for receiving the digital signal, and converting the data in the digital signal into the most basic RGB data of each pixel in the video picture and a video synchronous signal;
the pixel control signal generating module is used for generating a pixel control signal in each frame of picture according to the video synchronization signal output by the signal receiving module;
the initial brightness calculation module is used for calculating the initial brightness of each independent light source area in the multi-partition light source plate module;
the dark region enhancement module is used for realizing the brightness enhancement control of a dark light source region in the multi-partition light source plate module;
the spatial filtering module is used for realizing spatial filtering control of each region in the multi-partition light source plate module so as to realize smooth transition of the brightness of the light source on a spatial domain;
the time filtering module is used for realizing time filtering control of each area in the multi-partition light source plate module so as to realize smooth transition of the brightness of the light source on a time domain;
the power control module is used for controlling the output power of each light source area in the multi-partition light source plate module to achieve the required brightness;
the signal sending module is used for converting one frame of video field data containing red, green and blue data of each pixel into one frame of video field data containing red data, one frame of green data and one frame of blue data of each pixel, sequentially transmitting the video field data of three frames of different colors and synchronous control signals to the single-color liquid crystal panel in sequence, and simultaneously controlling RGB (red, green and blue) lamp beads on the multi-partition light source plate module.
The time domain based multi-partition light source projection system of the invention, wherein the digital signal is in the format of RGB, LVDS, eDP, V-BY-ONE or mipi.
The multi-partition light source projection control method based on the time domain is applied to the multi-partition light source projection device based on the time domain, and comprises the following steps:
receiving a digital signal, and converting data in the digital signal into the most basic RGB data of each pixel in a video picture and a video synchronous signal;
generating a pixel control signal in each frame of picture according to the video synchronous signal output by the signal receiving module;
analyzing the RGB data, and calculating the initial brightness of each light source area in the multi-partition light source plate module according to the pixel control signals;
dividing the whole area light source into a plurality of light source areas, and controlling the output power of each light source area in the multi-partition light source plate module according to the initial brightness;
brightness enhancement control of a dark light source area in the multi-partition light source plate module;
transmitting the related data of the output power to the light source driving chips of all the affiliated partitions for driving control so as to obtain the final actual brightness;
transmitting the pixel control signals to the liquid crystal panel for data processing;
sequentially transmitting RGB display data of pixels to a monochromatic liquid crystal panel according to the sequence of red, green and blue for data processing;
and simultaneously controlling the RGB lamp beads on the multi-partition light source plate module by the synchronous control signals in the pixel control signals.
The invention relates to a time domain-based multi-partition light source projection control method, wherein the method for transmitting pixel control signals to a liquid crystal panel for data processing comprises the following steps:
converting the parallel data into serial data and sending the serial data to the partition light source control module;
spatial filtering control is performed on each pixel area in the partitioned light source control module, wherein each pixel area corresponds to each light source area in the multi-partitioned light source plate module;
and controlling the time filtering of each frame of video picture in the liquid crystal panel to realize the smooth transition of the video picture.
The invention discloses a multi-partition light source projection control method based on a time domain, wherein the spatial filtering control is based on the formula:
L SF (n)＝max(L ben (n)，{L ben (m)-T SF |∈Φ(n)})；
L SF (n) represents the result of spatial filtering of the nth partition, L ben (n) is the brightness enhancement value of the nth partition, L ben (m) is the luminance enhancement value of the mth partition; t (T) SF Is a predefined parameter for controlling the smoothness of the filtering; phi (n) is a neighborhood of size 3X3 centered on the nth partition.
The invention discloses a multi-partition light source projection control method based on a time domain, wherein the time filtering control is based on the formula:
wherein the method comprises the steps ofRepresenting the output of the temporal filtering, (k) and (k-1) representing the current frame and the previous frame, respectively;representing the brightness value of the current frame partition; />Representing the brightness value of the previous frame partition; the parameter R (R is more than 0 and less than or equal to 1) controls the smoothness of the filtering, and the smaller R is, the smoother the filtering is, and less picture jitter is observed;
the formula for R is as follows:
wherein T is TF Is a predefined parameter controlling the shape of the filter, P mean Is the normalized average pixel value of all pixels in a frame of picture, (k) and (k-1) represent the current frame and the previous frame, respectively;and->Representing normalized average pixel values for the current frame and the previous frame.
The invention has the beneficial effects that: the invention provides a brand new light source projection mode, creatively combines a partition backlight control technology with a time domain control technology of lamp bead colors, and compared with the traditional single light source scheme and color liquid crystal panel scheme, the theoretical value of brightness of the scheme can be improved by 2-3 times, contrast ratio can be improved by more than fifty percent, color gamut can be improved by more than twenty percent, and the aim of breaking technical blockage of three-piece liquid crystal screen type projection is fulfilled.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described with reference to the accompanying drawings and embodiments, in which the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained by those skilled in the art without inventive effort:
FIG. 1 is an exploded view of a multi-zone light source projection device based on time domain according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of a time domain principle of a multi-partition light source projection device based on a time domain according to a preferred embodiment of the present invention;
FIG. 3 is a schematic block diagram of a time domain based multi-zone light source projection control system in accordance with a preferred embodiment of the present invention;
FIG. 4 is a flowchart of a multi-partition light source projection control method based on time domain according to a preferred embodiment of the present invention;
fig. 5 is a schematic diagram showing the division of a plurality of light source regions in a multi-partition light source projection control method based on a time domain according to a preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the following description will be made in detail with reference to the technical solutions in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be within the scope of the present invention, based on the embodiments of the present invention.
Referring to fig. 2, the multi-partition light source projection device based on time domain according to the preferred embodiment of the present invention, as shown in fig. 1, includes a multi-partition light source board module 2 and a multi-partition light source control board 11;
the multi-partition light source plate module 2 comprises a substrate, wherein a lamp bead array is arranged on the substrate, and a minimum lamp bead unit forming the lamp bead array comprises lamp beads with three colors of red, green and blue;
a multi-partition light source control board 11 receiving the digital signal and converting data in the digital signal into RGB data of each pixel in the video picture and a video synchronization signal; generating pixel control signals in each frame of picture according to the video synchronization signals; dividing the whole area light source of the multi-partition light source plate module into a plurality of light source areas, analyzing RGB data of each pixel, calculating optimal brightness data of each area in the whole video picture, and controlling output power of each corresponding light source area according to the optimal brightness data; performing enhancement control on the brightness of a dark light source area in the multi-partition light source plate module; transmitting the related data of the output power to the light source driving chips of all the affiliated partitions for driving control so as to obtain the final actual brightness; transmitting pixel control signals to a liquid crystal panel for data processing, sequentially transmitting RGB display data of pixels to a monochromatic liquid crystal panel for data processing according to the sequence of red, green and blue, and simultaneously controlling RGB lamp beads on a multi-partition light source plate module by synchronous control signals in the pixel control signals, namely, accurately controlling the switching and the brightness of the RGB lamp beads on the multi-partition light source plate module according to the same color while the liquid crystal panel displays each frame of RGB picture respectively;
the invention provides a brand new light source projection mode, creatively combines a partition backlight control technology with a time domain control technology of lamp bead colors, and compared with the traditional single light source scheme and color liquid crystal panel scheme, the theoretical value of brightness of the scheme can be improved by 2-3 times, contrast ratio can be improved by more than fifty percent, color gamut can be improved by more than twenty percent, and the aim of breaking technical blockage of three-piece liquid crystal screen type projection is fulfilled.
As shown in fig. 2, the time domain method is described as follows: adopting a time sequence to synchronously display R, G, B fields, and constructing a full-color picture by utilizing the visual residual characteristic of human eyes; r, G, B, the display time of any color field is 1/3 of the normal one, if the display picture is 60Hz field frequency, R, G, B three colors respectively display 60 frames of pictures in one second, and the display time becomes 180Hz field frequency;
preferably, the multi-partition light source projection device further comprises a front lens group 5, a grating 3, a rear lens group 6, a monochromatic liquid crystal panel 7, a fresnel lens 8 and a lens 10 (a reflector 9 can be added according to the requirement); the light source emitted by the multi-partition light source plate module 2 is subjected to light collimation and light homogenization treatment through the front lens group 5, light which is not parallel to a light path is filtered through the grating 3, the light utilization rate of the light is increased, the light passing through the grating is subjected to diffusion treatment through the rear lens group 6, the boundary dark area of the adjacent light source area is eliminated, and after passing through the monochromatic liquid crystal panel 7, an image is projected through the Fresnel lens and finally the lens 10;
the multi-partition light source plate module is arranged for multiple light sources so as to realize the whole-surface light emission and the requirement that each area can emit light independently; the radiator module and the multi-partition light source plate module are assembled into a whole to realize heat dissipation of the multi-partition light source plate module and the multi-partition light source control plate, and ensure reliable operation of the multi-partition light source plate module and the multi-partition light source control plate; the partition light source control board is used for realizing the fine switching control of each light source area on the multi-partition light source board module, thereby realizing the brightness requirement of each area in the video picture and achieving different display effects; preferably, the heat dissipation module 1 (4 is a fan matched with the heat dissipation module) can be configured to dissipate heat of the multi-partition light source plate module 2.
The multi-partition light source plate module 2 comprises a lamp bead array and a substrate; the lamp bead array is fixed on the substrate, and the whole back surface of the substrate is coated with heat-conducting silicone grease. In this embodiment, the substrate is provided as an aluminum substrate.
In another preferred embodiment, the substrate may be a copper substrate, a glass fiber cloth substrate, a synthetic fiber cloth substrate, a non-woven fabric substrate, a composite substrate, or the like, which is not particularly limited herein;
the light source of the projection device is made into a multi-partition light source of RGB colors densely distributed on the light source plate so as to achieve the effect that the whole surface of the light source plate can emit light and form various colors, and the brightness or the switch can be accurately and independently controlled aiming at the multi-light source densely distributed on the light source plate; the light sources are arranged in multiple subareas, and the light sources of each subarea are driven by weak current, so that the power consumption and the temperature are effectively reduced; the liquid crystal panel adopts single color, which can greatly improve the light transmittance and reduce the cost. Therefore, the projection device has the advantages of uniform picture brightness, enhanced contrast, enhanced color gamut, improved brightness, reduced power consumption and low temperature by adopting the technical means.
A time domain based multi-partition light source projection system is applied to the time domain based multi-partition light source projection device as described above, and as shown in fig. 3, the system comprises a signal receiving module 100, a pixel control signal generating module 101, an initial brightness calculating module 102, a dark region enhancing module 103, a spatial filtering module 104, a time filtering module 105, a power control module 106 and a signal sending module 107;
a signal receiving module 100 for receiving a digital signal, converting data in the digital signal into RGB data, which is the most basic of each pixel in a video picture, and a video synchronization signal;
preferably, the digital signal may be in the format of RGB, LVDS, eDP, V-BY-ONE, mipi, etc.;
a pixel control signal generating module 101, configured to generate a pixel control signal in each frame of picture according to the video synchronization signal output by the signal receiving module;
the initial brightness calculation module 102 is configured to calculate initial brightness of each independent light source area in the multi-partition light source plate module;
the dark area enhancement module 103 is used for realizing brightness enhancement control of a dark light source area in the multi-partition light source plate module;
the spatial filtering module 104 is configured to implement spatial filtering control of each region in the multi-partition light source plate module, so as to implement smooth transition of the brightness of the light source on the spatial domain;
the time filtering module 105 is used for realizing time filtering control of each area in the multi-partition light source plate module so as to realize smooth transition of the brightness of the light source on a time domain;
a power control module 106, configured to control output power of each light source area in the multi-partition light source board module to achieve a desired brightness;
the signal sending module 107 is configured to convert one frame of video field data including red, green and blue data of each pixel into one frame of video field data including red data, one frame of green data and one frame of blue data of each pixel, sequentially send three frames of video field data with different colors and synchronization control signals to the monochrome liquid crystal panel in sequence, and simultaneously control RGB lamp beads on the multi-partition light source board module by the synchronization control signals in the pixel control signals;
the operation principle of each module is as follows: receiving the digital signal and converting the data in the digital signal into RGB data of each pixel in the video picture and a video synchronization signal; generating pixel control signals in each frame of picture according to the video synchronization signals; dividing the whole area light source of the multi-partition light source plate module into a plurality of light source areas, analyzing RGB data of each pixel, calculating optimal brightness data of each area in the whole video picture, and controlling output power of each corresponding light source area according to the optimal brightness data; performing enhancement control on the brightness of a dark light source area in the multi-partition light source plate module; transmitting the related data of the output power to the light source driving chips of all the affiliated partitions for driving control so as to obtain the final actual brightness; transmitting pixel control signals to a liquid crystal panel for data processing, and sequentially transmitting RGB display data of pixels to a monochromatic liquid crystal panel for data processing according to the sequence of red, green and blue; the synchronous control signals in the pixel control signals also control the RGB lamp beads on the multi-partition light source plate module at the same time, so that the liquid crystal panel can display each frame of RGB picture respectively, and meanwhile, the RGB lamp beads on the multi-partition light source plate module can be accurately controlled to switch and brightness according to the same color.
The time domain-based multi-partition light source projection control method is applied to the time domain-based multi-partition light source projection device, as shown in fig. 4, and comprises the following steps:
s01: receiving a digital signal, and converting data in the digital signal into the most basic RGB data of each pixel in a video picture and a video synchronous signal;
taking LVDS signals as an example, the input LVDS signals are: system clock sys_clk, global RESET, LVDS differential clock signal clk_ P, CLK _ N, LVDS differential data signals lane0_p/n to lane3_p/n; the output signal is: the line synchronization signal HSYNC, the field synchronization signal VSYNC, the data enable signal DE, the pixel clock signal rx_clock, the 8-bit RED data RED [7:0], the 8-bit GREEN data GREEN [7:0], and the 8-bit BLUE data BLUE [7:0]. It can be understood that when the digital signal format is eDP signal or V-BY-ONE signal or mipi signal, the processing flow is substantially the same, and will not be described here again;
s02: generating a pixel control signal in each frame of picture according to the video synchronous signal output by the signal receiving module;
generating five pixel control signals hstart, hend, vstart, vend and valid according to three video synchronization signals of an output Vsync (field synchronization signal), hsync (line synchronization signal) and Den (data enable signal);
s03: analyzing the RGB data, and calculating the initial brightness of each light source area in the multi-partition light source plate module according to the pixel control signals;
specifically, the calculation of the initial brightness of each light source area in the multi-partition light source plate module may be implemented by the prior art, which is not specifically limited herein;
s04: dividing the whole area light source into a plurality of light source areas, and controlling the output power of each light source area in the multi-partition light source plate module according to the initial brightness;
referring to fig. 5, fig. 5 is a schematic diagram of dividing an entire surface light source into a plurality of light source regions.
Specifically, in this embodiment, the complete area light source is converted into a plurality of subarea light sources; obtaining optimal brightness data by calculating and analyzing pictures displayed in different partitions, converting the brightness data into driving current values, and then giving the driving current values to light source driving chips of the corresponding partitions to obtain the desired actual brightness; by using as many partitioned light sources as possible, different brightness is displayed in different areas on the same picture, and the ultra-high contrast ratio of more than two to three thousands can be easily achieved. It is understood that the number of the zones of the surface light source may be set as needed without specific limitation;
specifically, the present application sets a threshold mid and a maximum average luminance value upper_bound. When the average brightness of the light source area is smaller than mid, the brightness is output according to the original value, and when the average brightness exceeds mid, the output value is adjusted in a segmented mode, and the method is not particularly limited;
s05: brightness enhancement control of a dark light source area in the multi-partition light source plate module;
specifically, in the present embodiment, it is necessary to determine a dark light source region, and when a certain dark light source region is determined as a dark light source region, luminance enhancement control of the dark light source region is performed. It will be appreciated that the determination of the dark light source region is achieved by the prior art and is not specifically limited herein;
s06: transmitting the related data of the output power to the light source driving chips of all the affiliated partitions for driving control so as to obtain the final actual brightness;
s07: transmitting pixel control signals to a liquid crystal panel for data processing, sequentially transmitting RGB display data of pixels to a monochromatic liquid crystal panel for data processing according to the sequence of red, green and blue, and synchronously switching and accurately controlling brightness of RGB lamp beads on a multi-partition light source plate module according to the sequence;
the method for transmitting the pixel control signals to the liquid crystal panel for data processing comprises the following steps:
converting the parallel data into serial data and sending the serial data to the partition light source control module;
spatial filtering control is carried out on each pixel area in the partitioned light source control module, and each pixel area corresponds to each light source area in the multi-partitioned light source plate module;
and controlling the time filtering of each frame of video picture in the liquid crystal panel to realize the smooth transition of the video picture.
Preferably, the spatial filtering control is according to the formula:
L SF (n)＝max(L be n(n)，{L ben (m)-T SF |m∈Φ(n)})；
L SF (n) represents the result of spatial filtering of the nth partition, L ben (n) is the brightness enhancement value of the nth partition, L ben (m) is the luminance enhancement value of the mth partition; t (T) SF Is a predefined parameter for controlling the smoothness of the filtering; phi (n) is a neighborhood of size 3X3 centered on the nth partition.
Preferably, the temporal filtering control is according to the formula:
wherein the method comprises the steps ofRepresenting the output of the temporal filtering, (k) and (k-1) representing the current frame and the previous frame, respectively;representing the brightness value of the current frame partition; />Representing the brightness value of the previous frame partition; the parameter R (R is more than 0 and less than or equal to 1) controls the smoothness of the filtering, and the smaller R is, the smoother the filtering is, and less picture jitter is observed;
the formula for R is as follows:
wherein T is TF Is a predefined parameter controlling the shape of the filter, P mean Is the normalized average pixel value of all pixels in a frame of picture, (k) and (k-1) represent the current frame and the previous frame, respectively;and->Representing normalized average pixel values for the current frame and the previous frame.
It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
Claims (10)
1. The multi-partition light source projection device based on the time domain is characterized by comprising a multi-partition light source plate module and a multi-partition light source control plate;
the multi-partition light source plate module comprises a substrate, wherein a lamp bead array is arranged on the substrate, and a minimum lamp bead unit forming the lamp bead array comprises lamp beads with three colors of red, green and blue;
the multi-partition light source control board receives the digital signal and converts the data in the digital signal into RGB data of each pixel in the video picture and a video synchronization signal; generating pixel control signals in each frame of picture according to the video synchronization signals; dividing the whole area light source of the multi-partition light source plate module into a plurality of light source areas, analyzing RGB data of each pixel, calculating optimal brightness data of each area in the whole video picture, and controlling output power of each corresponding light source area according to the optimal brightness data; performing enhancement control on the brightness of a dark light source area in the multi-partition light source plate module; transmitting the related data of the output power to the light source driving chips of all the affiliated partitions for driving control so as to obtain the final actual brightness; the pixel control signals are transmitted to the liquid crystal panel for data processing, RGB display data of pixels are sequentially transmitted to the monochromatic liquid crystal panel for data processing according to the sequence of red, green and blue, and synchronous control signals in the pixel control signals also simultaneously control RGB lamp beads on the multi-partition light source plate module, namely, the liquid crystal panel respectively displays each frame of RGB, and meanwhile, the RGB lamp beads on the multi-partition light source plate module are accurately controlled in switching and brightness according to the same color.
2. The time domain based multi-zone light source projection device of claim 1, further comprising a front lens group, a grating, and a rear lens group, the multi-zone light source plate module, the front lens group, the grating, and the rear lens group being disposed in sequence;
the front lens group is used for carrying out light collimation and light homogenization treatment on light rays emitted by the multi-partition light source plate module;
the grating is used for filtering light rays which are not parallel to the light path;
the rear lens group is used for performing diffusion treatment on the light passing through the grating.
3. The time domain based multi-zone light source projection device of claim 2, further comprising a single color liquid crystal panel, the rear lens group and the single color liquid crystal panel being disposed in sequence.
4. The time domain based multi-zone light source projection device of claim 3 further comprising a fresnel lens and a lens, wherein the single color liquid crystal panel, the fresnel lens and the lens are disposed in that order.
5. A multi-partition light source projection system based on a time domain, which is applied to the multi-partition light source projection device based on the time domain as claimed in any one of claims 1-4, and is characterized by comprising a signal receiving module, a pixel control signal generating module, an initial brightness calculating module, a dark area enhancing module, a spatial filtering module, a time filtering module, a power control module and a signal sending module;
the signal receiving module is used for receiving the digital signal, and converting the data in the digital signal into the most basic RGB data of each pixel in the video picture and a video synchronous signal;
the pixel control signal generating module is used for generating a pixel control signal in each frame of picture according to the video synchronization signal output by the signal receiving module;
the initial brightness calculation module is used for calculating the initial brightness of each independent light source area in the multi-partition light source plate module;
the dark region enhancement module is used for realizing the brightness enhancement control of a dark light source region in the multi-partition light source plate module;
the spatial filtering module is used for realizing spatial filtering control of each region in the multi-partition light source plate module so as to realize smooth transition of the brightness of the light source on a spatial domain;
the time filtering module is used for realizing time filtering control of each area in the multi-partition light source plate module so as to realize smooth transition of the brightness of the light source on a time domain;
the power control module is used for controlling the output power of each light source area in the multi-partition light source plate module to achieve the required brightness;
the signal sending module is used for converting one frame of video field data containing red, green and blue data of each pixel into one frame of video field data containing red data, one frame of green data and one frame of blue data of each pixel, sequentially transmitting the video field data of three frames of different colors and synchronous control signals to the single-color liquid crystal panel in sequence, and simultaneously controlling RGB (red, green and blue) lamp beads on the multi-partition light source plate module.
6. The time domain based multi-zone light source projection system of claim 5, wherein the digital signal is in the format of RGB, LVDS, eDP, V-BY-ONE or mipi.
7. A time domain based multi-partition light source projection control method applied to the time domain based multi-partition light source projection device as claimed in any one of claims 1-4, comprising the steps of:
receiving a digital signal, and converting data in the digital signal into the most basic RGB data of each pixel in a video picture and a video synchronous signal;
generating a pixel control signal in each frame of picture according to the video synchronous signal output by the signal receiving module;
analyzing the RGB data, and calculating the initial brightness of each light source area in the multi-partition light source plate module according to the pixel control signals;
dividing the whole area light source into a plurality of light source areas, and controlling the output power of each light source area in the multi-partition light source plate module according to the initial brightness;
brightness enhancement control of a dark light source area in the multi-partition light source plate module;
transmitting the related data of the output power to the light source driving chips of all the affiliated partitions for driving control so as to obtain the final actual brightness;
transmitting the pixel control signals to the liquid crystal panel for data processing;
and sequentially transmitting RGB display data of pixels to a monochromatic liquid crystal panel according to the sequence of red, green and blue for data processing, and synchronously switching and accurately controlling the brightness of RGB lamp beads on the multi-partition light source plate module according to the sequence.
8. The time domain based multi-zone light source projection control method of claim 7, wherein transmitting the pixel control signal to the liquid crystal panel for data processing comprises the steps of:
converting the parallel data into serial data and sending the serial data to the partition light source control module;
spatial filtering control is performed on each pixel area in the partitioned light source control module, wherein each pixel area corresponds to each light source area in the multi-partitioned light source plate module;
and controlling the time filtering of each frame of video picture in the liquid crystal panel to realize the smooth transition of the video picture.
9. The time domain based multi-zone light source projection control method of claim 8, wherein the spatial filtering control is according to the formula:
L SF (n)＝max(L ben (n),{L ben (m)-T SF |m∈Φ(n)})；
L SF (n) represents the result of spatial filtering of the nth partition, L ben (n) is the brightness enhancement value of the nth partition, L ben (m) is the luminance enhancement value of the mth partition; t (T) SF Is a predefined parameter for controlling the smoothness of the filtering; Φ (N) is a neighborhood of size 3X3 centered on the nth partition.
10. The time domain based multi-zone light source projection control method of claim 8, wherein the time filtering control is based on the formula:
wherein the method comprises the steps ofRepresenting the output of the temporal filtering, (k) and (k-1) representing the current frame and the previous frame, respectively; />Representing the brightness value of the current frame partition; />Representing the brightness value of the previous frame partition; the parameter R (R is more than 0 and less than or equal to 1) controls the smoothness of the filtering, and the smaller R is, the smoother the filtering is, and less picture jitter is observed;
the formula for R is as follows:
wherein T is TF Is a predefined parameter controlling the shape of the filter, P mean Is the normalized average pixel value of all pixels in a frame of picture, (k) and (k-1) represent the current frame and the previous frame, respectively;and->Representing normalized average pixel values for the current frame and the previous frame.
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