CN107507581A - The wide colour gamut display methods of HDR and system - Google Patents
The wide colour gamut display methods of HDR and system Download PDFInfo
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- CN107507581A CN107507581A CN201710799657.2A CN201710799657A CN107507581A CN 107507581 A CN107507581 A CN 107507581A CN 201710799657 A CN201710799657 A CN 201710799657A CN 107507581 A CN107507581 A CN 107507581A
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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
- G09G3/3406—Control of illumination source
-
- 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
- G09G3/3406—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
- G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
Abstract
The present invention relates to video display technology, to realize HDR WCG display systems.The technical solution adopted by the present invention is the wide colour gamut display methods of HDR and system, including signal processing module, data forwarding module, backlight control module, backlight module and LCD MODULE；Signal processing module is used to the image or video data of input are carried out to include decoding process, feature extraction, liquid crystal compensation, the image processing operations of image enhaucament, and the backlight data after processing and corresponding control instruction are sent to data forwarding module, strengthens view data is delivered into liquid crystal driver module；Data forwarding module transmits the backlight data received or control instruction to each backlight control module；Backlight control module completes the display control to backlight module；Backlight module is used to provide reliable light source to liquid crystal panel；Liquid crystal module is then mainly made up of LCD and its drive circuit.Present invention is mainly applied to video to show occasion.
Description
Technical field
The present invention relates to video to show, technical field of information transmission, specifically, is related to HDR-wide colour gamut and shows
Method and system.
Background technology
Liquid crystal display (Liquid crystal displays, LCDs) is because its definition is high, service life is long, valency
The advantages such as lattice are low become main flow display device on the market.In recent years, LCDs is in contrast, power consumption, colour gamut, moving image matter
Amount etc. is obtained for very big improvement.
But traditional LC Ds dynamic range is very limited, generally below 1000:1[2].And the brightness range in nature is about
10-6~10+8cd/m2, human eye is adapted to different lightness environments by the regulation of pupil, faint starlight, summer under the night sky
Dazzling sunlight in day, its sensing range is about 10-3~10+5cd/m2[2],[3].Even in synchronization, human eye can also be felt
To the brightness range of about 5 orders of magnitude.Therefore LCDs is difficult to meet human eye vision, certainly will cause the untrue of viewing effect
Property.
In order to improve the dynamic range of display device, substantial amounts of research work is all carried out both at home and abroad.In HDR
In (High dynamic range, HDR) LCDs research-and-development activity, the Display Technique based on shuangping san structure is mesh
Preceding research emphasis.The display structure that the Display Technique of shuangping san structure uses at present mainly has projecting apparatus-LCDs
(Projector-LCD)[2], light emitting diode-LCDs (LED-LCD)[2], LCDs-LCDs (LCD-
LCD)[4]And field emission display screen-LCDs (FED-LCD)[3].The wherein HDR Display Techniques tool of LED-LCD structures
Realize simple and flexible, it is workable, cost is cheap the features such as, display system of the invention uses this Display Technique.
LCDs colour gamut can reduce with the increase of brightness, when showing the image of higher brightness, the saturation degree of color
It can be decreased obviously with stereovision.Therefore HDR display effect is being realized simultaneously, the extension of color domain is also particularly important.Mesh
The method of preceding gamut extension mainly has two classes：Using the three primary colors or the more primary colors of use of more saturation.International Telecommunication Union
The BT.2020 standards that (International telecommunication union, ITU) is proposed are using more saturation
Three primary colors, colour gamut is than traditional BT.709[5]Colour gamut it is broader.Specific implementation can be by using narrow-band LED[6]Or laser
As backlight[7].This mode can effectively express the RGB of high saturation, but the saturation degree of its corresponding complementary color is difficult to carry
It is high.Many companies and research unit have carried out more primary colors gamut extension technical research accordingly, and major way has and increased more on LCD
The optical filter of more colors[8],[9], or the back light unit using more primary colors[10], this to show higher sapphire blue of saturation degree
Color, brass etc. become possibility.
The present invention is based on existing HDR Display Technique and gamut extension technology, it is proposed that a kind of high dynamic-wide color
The design of domain (High dynamic range-wide color gamut, HDR-WCG) display system, compared to tradition
Display, the dynamic range of the display system can obtain large increase, and colour gamut can obtain effective extension.
Bibliography
[1]Yuma Sano,Ryosuke Nonaka,Masahiro Baba.Wide gamut LCD using
locally dimmable four-primary-color LED backlight[J].Journal of the SID,
2012.09.
[2]H.Seetzen,W.Heidrich,W.Stuerzlinger,et.al.High dynamic range
display systems[J].ACM Transactions on Graphics,2004,23(3):760-768.
[3]J.Yao,B.Guo,T.Guo,S.Hu,S.Xu and Q.Xin,The system of High Dynamic
Range Display based on the dual structure of the LCD-FED[J].2013IEEE Third
International Conference on Information Science and Technology(ICIST),
Yangzhou,2013,pp.471-475.
[4]G.Guarnieri,L.Albani and G.Ramponi,Image splitting techniques for
a dual layer high dynamic range LCD display[J].SPIE Medical Imaging,vol.17,
pp.043009-1-9,Nov.2008.
[5]ITU.Parameter values for the HDTV standards for production and
international programme exchange[S].Recommendation BT.709-5(2002).
[6]K.Kakinuma et al..Technology of wide color gamut backlight with
RGB light-emitting diode for liquid crystal display television[J].SID
Symposium Digest 38,1232–1235(2007).
[7]K.Masaoka et al..Design of primaries for a wide-gamut television
colorimetry[J].IEEE Trans.Broadcast.56,452–457(2010).
[8]Y.Yoshida,et al..Novel wide color gamut liquid crystal display
with five-primary color[C].Proc.of the 28th Int.Display Research Conf.,115-
118(2008).
[9]S.Roth et al..Multi-primary LCD for TV applications[J].SID
Symposium Digest 38,34–37(2007).
[10]K.Hinnen et al..Ultra-wide-gamut LCD using a local multi-spectral
backlight[J].SID Symposium Digest 46,669–672(2011).
The content of the invention
For overcome the deficiencies in the prior art, the present invention is directed to propose a kind of design of systemic high-speed, is realized
HDR-WCG display systems.The technical solution adopted by the present invention is HDR-wide colour gamut display system, including signal transacting
Module, data forwarding module, backlight control module, backlight module and LCD MODULE；Signal processing module is used for defeated
The image or video data entered carries out including decoding process, feature extraction, liquid crystal compensation, the image processing operations of image enhaucament,
And the backlight data after processing and corresponding control instruction are sent to data forwarding module, strengthens view data is delivered into liquid crystal and driven
Dynamic model block；Data forwarding module uses bus low pressure differential transfer BLVDS (Bus low voltage differential
Signaling) technology, the backlight data received or control instruction are transmitted to each backlight control module；Backlight control mould
Root tuber completes the display control to backlight module according to protocol analysis data；Backlight module is by white and sapphire blue light emitting diode battle array
Backlight, diffusion barrier, bright enhancement film and the reflectance coating for arranging WE LEDs (White and emerald LEDs) are formed, for liquid
Crystal panel provides reliable light source；Liquid crystal module is then mainly made up of LCD and its drive circuit.
HDR-wide colour gamut display methods, image or video data to input carry out including decoding process, feature
Extraction, liquid crystal compensation, the image processing operations of image enhaucament, and the backlight data after processing and corresponding control instruction are sent to
Data forwarding module carries out data forwarding, and strengthens view data is delivered into liquid crystal driver module；Data forwarding uses bus low pressure
Differential transfer BLVDS (Bus low voltage differential signaling) technology, the backlight data that will be received
Or control instruction is transmitted to each backlight control module；According to protocol analysis data in backlight control module, complete to backlight
The display control of module；Backlight module is by white and sapphire blue light emitting diode matrix WE LEDs (White and emerald
LEDs backlight, diffusion barrier, bright enhancement film and reflectance coating) is formed, for providing reliable light source to liquid crystal panel；Liquid crystal module
Then mainly it is made up of LCD and its drive circuit.
Image processing operations further comprise the concrete steps that, first, it is original that corresponding source coding acquisition are carried out to input information source
View data, appropriate pretreatment is then carried out, including carry out contrast stretching or tone mapping processing, hereafter according to pretreatment
Include average value, maximum afterwards, the characteristics of image of histogram distribution carries out backlight extraction, and backlight is carried out using light spread function
Diffusion simulations, acquisition and image backlight image of the same size, with reference to the image of pretreatment, liquid is completed using system imaging model
Crystalline substance compensation, finally carries out appropriate post processing to the image after compensation.
It is specifically the system imaging model completion liquid crystal compensation according to formula (1) using system imaging model：
F is the color observed in formula (1), and R, G, B is respectively the light transmittance that liquid crystal is corresponded under three kinds of optical filters of RGB；
[Rw], [Gw], [Bw] opened for only white backlight and when being high-high brightness, a kind of filter in LCD three kinds of optical filters of red, green, blue
Liquid crystal transmittance is corresponded under mating plate and reaches maximum, and is observed under other two kinds of optical filters during liquid crystal transmittance minimum red green
Primary colors；[Re], [Ge], [Be] it is that only sapphire backlight is opened and is high-high brightness, LCD three kinds of red, green, blue is filtered
Liquid crystal transmittance is corresponded in mating plate under a kind of optical filter and reaches maximum, and liquid crystal transmittance minimum when institute under other two kinds of optical filters
The red green blue tricolor observed；BLw refers to white light intensity, and its value is that 0~1, BLe refers to white light intensity, and its value is 0~1.
Post-processing step is gamma correction or saturation degree enhancing processing.
The features of the present invention and beneficial effect are：
The design of high dynamic proposed by the invention-wide colour gamut display system, by signal processing module, data forwarding
Five module, backlight control module, backlight module and LCD MODULE parts form.Wherein backlight module by white LEDs and
Sapphire blue LED is formed, and expanded color gamut and can improve dynamic range well, can using the data forwarding module of BLVDS agreements
Realize the data transfer of high-speed.Present design can reach the purpose for realizing HDR-WCG display systems.
Brief description of the drawings：
Fig. 1 display system architectures.
Fig. 2 signal processing module handling processes.
Fig. 3 data forwarding module structures.
Fig. 4 backlight control module logical constructions.
Fig. 5 backing structures.
Embodiment
Design general diagram proposed by the present invention is as shown in Figure 1.
As shown in Figure 1.Display system is divided into 5 modules by function：Signal processing module, data forwarding module, backlight
Control module, backlight module and LCD MODULE.Each module concrete structure and function are as follows：
(1) signal processing module
Signal processing module is mainly used in carrying out the image or video data of input image processing operations, and by after processing
Backlight data and corresponding control instruction be sent to data forwarding module, strengthens view data is delivered into liquid crystal driver module.Its
Handling process is as shown in Figure 2.
First, corresponding source coding is carried out to input information source and obtains raw image data, then carry out appropriate pretreatment,
Contrast stretching or tone mapping processing processing are such as carried out, hereafter according to pretreated characteristics of image (such as average value, maximum
Value, histogram distribution etc.) backlight extraction is carried out, simulation is diffused to backlight using light spread function, is obtained and image size
Consistent backlight image, with reference to the image of pretreatment, the system imaging model according to formula (1) completes liquid crystal compensation, finally
Appropriate post processing (such as gamma correction, saturation degree enhancing) acquisition is carried out to the image after compensation to be eventually displayed on liquid crystal display
View data.
F is the color observed in formula (1), and R, G, B is respectively the light transmittance that liquid crystal is corresponded under three kinds of optical filters of RGB；
[Rw], [Gw], [Bw] opened for only white backlight and when being high-high brightness, a kind of filter in LCD three kinds of optical filters of red, green, blue
Liquid crystal transmittance is corresponded under mating plate and reaches maximum, and (light tight) is observed during liquid crystal transmittance minimum under other two kinds of optical filters
The red green blue tricolor arrived；[Re], [Ge], [Be] opened for only sapphire backlight and be high-high brightness, LCD it is red, green,
Liquid crystal transmittance is corresponded in blue three kinds of optical filters under a kind of optical filter and reaches maximum, and liquid crystal transmittance under other two kinds of optical filters
The red green blue tricolor that (light tight) is observed when minimum；BLw refers to white light intensity, and its value is that to refer to white light strong by 0~1, BLe
Degree, its value are 0~1.
(2) data forwarding module
Data forwarding module uses field programmable gate array (Field programmable gate in the present invention
Array, FPGA) chip as main control chip, completes reception, feedback and the forwarding capability of data.The module is supported a variety of logical
Interface is believed to complete the communication with signal processor, is USB2.0 interfaces, serial ports and Low voltage differential signaling (Low respectively
Voltage differential signaling, LVDS) interface.The module is realized and backlight control module using BLVDS
Communication, and support multiple slave units to access.Its building-block of logic is as shown in Figure 3.
Fpga chip can Intelligent Recognition interface data and will receive data deposit receive data buffer storage, will send out data buffer storage number
According to being sent to communication interface.BLVDS drivers, which may have access to, receives data buffer storage, and is broadcasted to BLVDS buses；BLVDS connects
Receiving device can receive to the data of BLVDS buses and to be deposited into hair data buffer storage.
(3) backlight control module
In order to avoid influence of the higher temperature to kernel control chip, the design is independent into module by backlight control device.
For the convenience of connection, backlight control module is designed to forth generation internal memory (the Fourth generation double of 288 pin
Data rate synchronous dynamic random access memory, DDR4) structure, 264 in these pins
Pin is used as LED drive signal, and 20 pins are used for the power supply of module, and remaining pin is sky.
The module uses fpga chip to complete following module or function using hardware description language as control chip
Design：BLVDS transceivers, data command parsing, pulse width modulation (Pulse width modulation, PWM) waveform
Generation module.Its logical construction is as shown in Figure 4.
BLVDS transceivers are used to data command is received and sent by BLVDS, and data command parsing is then to receiving data
Instruction decode and execute instruction, and PWM generation module is then used to produce the PWM waveform for being used for controlling LED luminance.
(4) backlight module
The present invention is using white light LEDs and sapphire blue LED as backlight, and it is according to white light and the alternate mode of jewel blue light
Arranged, its design diagram is as shown in Figure 5.
The design of high dynamic proposed by the invention-wide colour gamut display system, by signal processing module, data forwarding
Five module, backlight control module, backlight module and LCD MODULE parts form.Wherein backlight module by white LEDs and
Sapphire blue LED is formed, and expanded color gamut and can improve dynamic range well, can using the data forwarding module of BLVDS agreements
Realize the data transfer of high-speed.Present design can reach the purpose for realizing HDR-WCG display systems.
Claims (5)
1. a kind of HDR-wide colour gamut display system, it is characterized in that, including signal processing module, data forwarding module, the back of the body
Photocontrol module, backlight module and LCD MODULE；Signal processing module is used to enter the image or video data of input
Row includes decoding process, feature extraction, liquid crystal compensation, the image processing operations of image enhaucament, and by the backlight data after processing
And corresponding control instruction is sent to data forwarding module, and strengthens view data is delivered into liquid crystal driver module；Data forwarding module
Using bus low pressure differential transfer BLVDS (Bus low voltage differential signaling) technology, will receive
To backlight data or control instruction transmit to each backlight control module；Backlight control module is complete according to protocol analysis data
The display control of paired backlight module；Backlight module is by white and sapphire blue light emitting diode matrix WE LEDs (White and
Emerald LEDs) backlight, diffusion barrier, bright enhancement film and reflectance coating form, for giving liquid crystal panel to provide reliable light source；
Liquid crystal module is then mainly made up of LCD and its drive circuit.
2. a kind of HDR-wide colour gamut display methods, it is characterized in that, image or video data to input carry out including solution
Code processing, feature extraction, liquid crystal compensation, the image processing operations of image enhaucament, and by the backlight data after processing and accordingly control
Instruction processed is sent to carry out data forwarding, and strengthens view data is delivered into liquid crystal driver module；Data forwarding is low using bus
Differential transfer BLVDS (the Bus low voltage differential signaling) technology of pressure, the backlight number that will be received
According to or control instruction transmit to each backlight control module；According to protocol analysis data in backlight control module, complete to the back of the body
The display control of optical mode group；Backlight module is by white and sapphire blue light emitting diode matrix WE LEDs (White and emerald
LEDs backlight, diffusion barrier, bright enhancement film and reflectance coating) is formed, for providing reliable light source to liquid crystal panel；Liquid crystal module
Then mainly it is made up of LCD and its drive circuit.
3. HDR as claimed in claim 2-wide colour gamut display methods, it is characterized in that, image processing operations are further
Comprise the concrete steps that, first, corresponding source coding is carried out to input information source and obtains raw image data, then carries out appropriate pre- place
Reason, including contrast stretching or tone mapping processing are carried out, include average value, maximum, histogram after hereafter foundation pretreatment
The characteristics of image of distribution carries out backlight extraction, and simulation is diffused to backlight using light spread function, is obtained and image size one
The backlight image of cause, with reference to the image of pretreatment, liquid crystal compensation is completed using system imaging model, finally to the image after compensation
Carry out appropriate post processing.
4. HDR as claimed in claim 2-wide colour gamut display methods, it is characterized in that, using system imaging model tool
Body is that the system imaging model according to formula (1) completes liquid crystal compensation：
<mrow>
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<mtable>
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<mi>G</mi>
</mtd>
</mtr>
<mtr>
<mtd>
<mi>B</mi>
</mtd>
</mtr>
</mtable>
</mfenced>
<mi>T</mi>
</msup>
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</mtd>
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<mi>B</mi>
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</msub>
<mo>&rsqb;</mo>
</mtd>
</mtr>
</mtable>
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F is the color observed in formula (1), and R, G, B is respectively the light transmittance that liquid crystal is corresponded under three kinds of optical filters of RGB；[Rw],
[Gw], [Bw] opened for only white backlight and when being high-high brightness, a kind of optical filter in LCD three kinds of optical filters of red, green, blue
Lower corresponding liquid crystal transmittance reaches maximum, and the RGB three observed under other two kinds of optical filters during liquid crystal transmittance minimum
Primary colors；[Re], [Ge], [Be] opened for only sapphire backlight and be high-high brightness, LCD three kinds of optical filters of red, green, blue
Liquid crystal transmittance is corresponded under a kind of middle optical filter and reaches maximum, and is observed under other two kinds of optical filters during liquid crystal transmittance minimum
The red green blue tricolor arrived；BLw refers to white light intensity, and its value is that 0~1, BLe refers to white light intensity, and its value is 0~1.
5. HDR as claimed in claim 2-wide colour gamut display methods, it is characterized in that, post-processing step is gamma school
Just or saturation degree enhancing is handled.
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| CN108428438A (en) * | 2018-04-11 | 2018-08-21 | 深圳市嘉利达专显科技有限公司 | Screen brightness of LCD and color temperature correction system, method and storage medium |
| CN110070805A (en) * | 2019-05-31 | 2019-07-30 | 中山大学 | The double light source electronic show windows and control method of a kind of wide colour gamut, high-color rendering |
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