CN101814279B - Dynamic backlight liquid crystal display system and method - Google Patents
Dynamic backlight liquid crystal display system and method Download PDFInfo
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- CN101814279B CN101814279B CN201010157222A CN201010157222A CN101814279B CN 101814279 B CN101814279 B CN 101814279B CN 201010157222 A CN201010157222 A CN 201010157222A CN 201010157222 A CN201010157222 A CN 201010157222A CN 101814279 B CN101814279 B CN 101814279B
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Abstract
The invention discloses dynamic backlight liquid crystal display system and method. The system comprises a pixel brightness computing unit, a brightness histogram counting unit, a brightness representative value computing unit, a time domain filtering unit, a video signal compensating unit and a nonlinear processing unit, wherein the pixel brightness computing unit, the brightness histogram counting unit, the brightness representative value computing unit and the time domain filtering unit are sequentially connected; and the time domain filtering unit is respectively connected with the video signal compensating unit and the nonlinear processing unit. The invention can effectively reduce the energy consumption of a liquid crystal display device, improve dynamic contrast and color saturation of displayed images, effectively improve image quality problems brought by dynamic backlight liquid crystal display, restrain flicker among frames, and keep image details.
Description
Technical field
The invention belongs to technical field of liquid crystal display, relate to a kind of liquid crystal display systems, relate in particular to a kind of dynamic backlight liquid crystal display system; Simultaneously, the invention still further relates to a kind of display packing of above-mentioned dynamic backlight liquid crystal display system.
Background technology
Liquid crystal indicator (LCD) is made up of liquid crystal panel and back light unit usually.Generally, back light unit sends constant uniform light and offers liquid crystal panel, then the transmittance display image of regulator solution crystal panel pixel cell.Under this display mode, the luminosity of back light unit and institute's images displayed content are irrelevant, no matter be the image of dark or bright image, back light unit is luminous according to high-high brightness all the time, cause the liquid crystal display existing problems:
The first, power consumption is higher.Because back light unit is luminous with high-high brightness, for showing that dark image is unnecessary, the power consumption of liquid crystal indicator is too high in the prior art; Can show dark image through reducing backlight illumination, thereby reduce power consumption.
The second, dynamic contrast and color saturation are lower.Reduce the contrast and the color saturation of institute's display image,, thereby cause picture contrast and color saturation lower because the light leak characteristic of liquid crystal panel if back light unit is luminous with high-high brightness all the time, can cause picture black black.
The dynamic backlight control technology can improve and solve the problems referred to above that liquid crystal indicator exists to a certain extent.Dynamically adjust backlight luminescence brightness according to institute's images displayed content, not only can reduce power consumption, can also improve the dynamic contrast and the color saturation of institute's display image.
Summary of the invention
Technical matters to be solved by this invention is: a kind of dynamic backlight liquid crystal display system is provided, can reduces power consumption, can also improve the dynamic contrast and the color saturation of institute's display image.
In addition, the present invention also provides a kind of dynamic backlight liquid crystal display method, can reduce power consumption, can also improve the dynamic contrast and the color saturation of institute's display image.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of dynamic backlight liquid crystal display system, said system comprises:
The pixel intensity computing unit is in order to calculate the pixel intensity of the video signal image of importing;
The brightness histogram statistic unit is in order to the brightness histogram of statistics input picture;
Brightness typical value computing unit is in order to calculate the brightness typical value; Begin from brightness histogram high-high brightness grade; The number of pixels of all brightness degrees between current brightness degree and the high-high brightness grade is added up; Like accumulation result greater than a pre-set threshold, the brightness typical value that then current brightness degree is a video signal image;
The time-domain filtering unit carries out time-domain filtering in order to the brightness typical value to video signal image, is the backlight illumination controlling value if filtered, is set the brightness typical value of video signal image less than the brightness typical value of video signal image; Otherwise setting filtered is the backlight illumination controlling value;
The compensated video signal unit is in order to the backlight control value compensation video signal image that obtains based on said time-domain filtering unit, the video signal image after the output compensation;
The Nonlinear Processing unit is in order to carry out Nonlinear Processing to the backlight illumination controlling value, the brightness of output result control backlight luminescence.
As a kind of preferred version of the present invention, the maximal value of the plain rgb value of said pixel intensity computing unit capture is as brightness value.
As a kind of preferred version of the present invention, the method for said brightness typical value computing unit is:
Wherein, I
rBe the brightness typical value of video signal image, H (i) is a brightness histogram, I
MaxBe maximum brightness value, Thr is a pre-set threshold;
For the brightness histogram (promptly using the brightness histogram littler) that uses less gray scale than video luminance signal rank, also need change the brightness typical value, this moment, the brightness typical value of video signal image was: I '
r=L*I
r+ L-1.
As a kind of preferred version of the present invention, said time-domain filtering unit at first carries out time-domain filtering to the brightness typical value of video signal image:
I
t＝(1-k)*I
t-1+k*I
r
Wherein, I
tBe the time-domain filtering result, k is the time-domain filtering coefficient, is preestablished by the outside; Then, confirm backlight illumination controlling value I
c=MAX (I
r, I
t).
As a kind of preferred version of the present invention, said Nonlinear Processing unit carries out Nonlinear Processing to the backlight illumination controlling value:
Wherein, I
bBe the backlight illumination controlling value of proofreading and correct, I
B, maxBe maximum backlight illumination controlling value, I
MaxBe the vision signal maximum brightness value, γ is a non-linear correction factor, and is consistent with the non-linear response characteristic of liquid crystal panel;
Perhaps, the Nonlinear Processing of said Nonlinear Processing unit realizes with the mode of look-up table LUT.
As a kind of preferred version of the present invention, said compensated video signal unit calculates by following formula based on backlight illumination controlling value compensation video signal image:
R′＝MIN(I
max，f*R)；
G′＝MIN(I
max，f*G)；
B′＝MIN(I
max，f*B)；
Wherein, MIN is the minimalization operation, and R, G, B are the video signal image pixel value after the compensation for the preceding video signal image pixel value of compensation, R ', G ', B ', and f is the adjustment coefficient, and it is definite to press following formula:
Video signal image before the compensation is current input video, or for there being the video signal image in the storer.A kind of dynamic backlight liquid crystal display method, said method comprises the steps:
The incoming video signal image;
Calculate the pixel intensity of the video signal image of input;
The brightness histogram of statistics input picture;
Calculate the brightness typical value; Begin from brightness histogram high-high brightness grade; The number of pixels of all brightness degrees between current brightness degree and the high-high brightness grade is added up; Like accumulation result greater than a pre-set threshold, the brightness typical value that then current brightness degree is a video signal image;
Brightness typical value to video signal image is carried out time-domain filtering, is the backlight illumination controlling value if filtered, is set the brightness typical value of video signal image less than the brightness typical value of video signal image; Otherwise setting filtered is the backlight illumination controlling value;
Based on the backlight control value compensation video signal image that said time-domain filtering unit obtains, the video signal image after the output compensation;
The backlight illumination controlling value is carried out Nonlinear Processing, the brightness of output result control backlight luminescence.
As a kind of preferred version of the present invention; When detecting input picture activity data commencing signal, the calculating pixel brightness of brightness calculation unit, and pixel brightness value inputed to the brightness histogram statistic unit; Statistic histogram is up to detecting activity of imagination ED signal;
After detecting input picture activity data end signal; The brightness typical value of brightness typical value computing unit calculating input image; And the result is inputed to the time-domain filtering unit carry out filtering; Upgrade the backlight illumination controlling value with filtered, then the backlight illumination controlling value is carried out Nonlinear Processing, with the brightness of result control backlight luminescence;
Simultaneously, the incoming video signal image is compensated the video signal image after the output compensation based on the current backlight controlling value.
As a kind of preferred version of the present invention; When detecting input picture activity data commencing signal, the calculating pixel brightness of brightness calculation unit, and pixel brightness value inputed to the brightness histogram statistic unit; Statistic histogram is up to detecting activity of imagination ED signal; When carrying out above calculating, the incoming video signal image is stored in the external memory storage;
After detecting input picture activity data end signal; The brightness typical value of brightness typical value computing unit calculating input image; And the result is inputed to the time-domain filtering unit carry out filtering; Upgrade the backlight illumination controlling value with filtered, then the backlight illumination controlling value is carried out Nonlinear Processing, with the brightness of result control backlight luminescence;
Simultaneously, input and the corresponding video signal image of current backlight brilliance control value compensate based on the current backlight controlling value from external memory storage, the video signal image after the output compensation.
Beneficial effect of the present invention is: the present invention can effectively reduce the power consumption of liquid crystal indicator, improves the dynamic contrast and the color saturation of display image; And can effectively improve the image quality issues that the dynamic backlight liquid crystal display is brought, suppress the interframe flicker, keep image detail.
Description of drawings
Fig. 1 is the process flow diagram of the embodiment of the invention one.
Fig. 2 is the synoptic diagram of the embodiment of the invention one.
Fig. 3 is the process flow diagram of the embodiment of the invention two.
Fig. 4 is the synoptic diagram of the embodiment of the invention two.
Embodiment
Specify the preferred embodiments of the present invention below in conjunction with accompanying drawing.
Embodiment one
See also Fig. 2; The present invention has disclosed a kind of dynamic backlight liquid crystal display system, and said system comprises pixel intensity computing unit, brightness histogram statistic unit, brightness typical value computing unit, time-domain filtering unit, compensated video signal unit, Nonlinear Processing unit.Pixel intensity computing unit, brightness histogram statistic unit, brightness typical value computing unit, time-domain filtering unit connect successively, and the time-domain filtering unit is connected with compensated video signal unit, Nonlinear Processing unit respectively.Below introduce each ingredient of the present invention respectively.
[pixel intensity computing unit]
The pixel intensity computing unit is in order to calculate the pixel intensity of the video signal image of importing.In the present embodiment, the maximal value of the plain rgb value of said pixel intensity computing unit capture is as brightness value.
Coloured image representes with RGB three looks, and the method for calculating coloured image brightness has multiple, and the present invention gets the maximal value of rgb value, and (B), wherein, MAX operates for getting maximum value for R, G as brightness: I=MAX.
[brightness histogram statistic unit]
The brightness histogram statistic unit is in order to the brightness histogram of statistics input picture.
Brightness histogram is effective ways of describing image statistics information, and its essence is to calculate the number of pixels of different gray scales.The gray scale that is used for the video signal image of liquid crystal display is generally 256 grades or 1024 grades; But statistic histogram is not limited to 256 grades or 1024 grades; Also can use the statistics with histogram of less gray scale; Need this moment more gray scale is mapped to less gray scale, like 64 grades of statistics with histogram.Setting video signal pattern gray scale is I
v, the histogram gray scale is I
h, then the gray scale zoom factor is:
Promptly need L video signal image gray scale be mapped to a histogram gray scale.
[brightness typical value computing unit]
Brightness typical value computing unit is in order to calculate the brightness typical value; Begin from the high-high brightness grade, the number of pixels of all brightness degrees between current brightness degree and the high-high brightness grade added up, like accumulation result greater than a pre-set threshold, the brightness typical value that then current brightness degree is a video signal image.
In the present embodiment, calculate the brightness typical value of video signal image, calculate by following formula:
Wherein, I
rBe the brightness typical value of video signal image, H (i) is a brightness histogram, I
MaxBe maximum brightness value, Thr is a pre-set threshold.For the brightness histogram (using the brightness histogram littler) that uses less gray scale than video luminance signal rank, also need change the brightness typical value, this moment, the brightness typical value of video signal image was:
I′
r＝L*I
r+L-1。
Wherein, L is the gray scale zoom factor.
[time-domain filtering unit]
The time-domain filtering unit carries out time-domain filtering in order to the brightness typical value to video signal image, is the backlight illumination controlling value if filtered, is set the brightness typical value of video signal image less than the brightness typical value of video signal image; Otherwise setting filtered is the backlight illumination controlling value.
Calculate the backlight illumination controlling value, at first the brightness typical value of video signal image carried out time-domain filtering:
I
t＝(1-k)*I
t-1+k*I
r
Wherein, I
tBe the time-domain filtering result, k is the time-domain filtering coefficient, is preestablished by the outside; Then, confirm the backlight illumination controlling value by following formula:
I
c＝MAX(I
r，I
t)
[Nonlinear Processing unit]
The Nonlinear Processing unit is in order to carry out Nonlinear Processing to the backlight illumination controlling value, the brightness of output result control backlight luminescence.
Because the nonlinear characteristic of liquid crystal panel need be carried out Nonlinear Processing to the backlight illumination controlling value:
Wherein, I
bBe the backlight illumination controlling value of proofreading and correct, I
B, maxBe maximum backlight illumination controlling value, I
MaxBe the vision signal maximum brightness value, γ is a non-linear correction factor, and is consistent with the non-linear response characteristic of liquid crystal panel usually.Nonlinear Processing also can use the mode of look-up table (LUT) to realize.
[compensated video signal unit]
The backlight control value compensation video signal image of compensated video signal unit in order to obtain based on said time-domain filtering unit, the video signal image after the output compensation.
Based on backlight illumination controlling value compensation video signal image, calculate by following formula:
R′＝MIN(I
max，f*R)
G′＝MIN(I
max，f*G)
B′＝MIN(I
max，f*B)
Wherein, MIN is the minimalization operation, and R, G, B are the video signal image pixel value after the compensation for the preceding video signal image pixel value of compensation, R ', G ', B ', and f is the adjustment coefficient, and it is definite to press following formula:
Video signal image before the compensation can be current input video, also can be the video signal image that exists in the storer.
More than introduced dynamic backlight liquid crystal display system of the present invention, the present invention also discloses the dynamic backlight liquid crystal display method of said system when disclosing above-mentioned dynamic backlight liquid crystal display system; See also Fig. 1, said dynamic backlight liquid crystal display method comprises the steps:
(1) incoming video signal image;
(2) pixel intensity of the video signal image of calculating input;
(3) brightness histogram of statistics input picture;
(4) calculate the brightness typical value; Begin from brightness histogram high-high brightness grade; The number of pixels of all brightness degrees between current brightness degree and the high-high brightness grade is added up; Like accumulation result greater than a pre-set threshold, the brightness typical value that then current brightness degree is a video signal image;
(5) the brightness typical value of video signal image being carried out time-domain filtering, is the backlight illumination controlling value if filtered, is set the brightness typical value of video signal image less than the brightness typical value of video signal image; Otherwise setting filtered is the backlight illumination controlling value;
(6) the backlight control value compensation video signal image that obtains based on said time-domain filtering unit, the video signal image after the output compensation;
(7) the backlight illumination controlling value is carried out Nonlinear Processing, the brightness of output result control backlight luminescence.
Particularly, see also Fig. 1, Fig. 2, when detecting input picture activity data commencing signal; The calculating pixel brightness of brightness calculation unit; And pixel brightness value inputed to the brightness histogram statistic unit, statistic histogram is up to detecting activity of imagination ED signal;
After detecting input picture activity data end signal; The brightness typical value of brightness typical value computing unit calculating input image; And the result is inputed to the time-domain filtering unit carry out filtering; Upgrade the backlight illumination controlling value with filtered, then the backlight illumination controlling value is carried out Nonlinear Processing, with the brightness of result control backlight luminescence.
Simultaneously, the incoming video signal image is compensated the video signal image after the output compensation based on the current backlight controlling value.
The characteristics of present embodiment are not need external memory storage.
In sum, the present invention can effectively reduce the power consumption of liquid crystal indicator, improves the dynamic contrast and the color saturation of display image; And can effectively improve the image quality issues that the dynamic backlight liquid crystal display is brought, suppress the interframe flicker, keep image detail.
Embodiment two
See also Fig. 3, Fig. 4, the characteristics of present embodiment need external memory storage.
When detecting input picture activity data commencing signal, the calculating pixel brightness of brightness calculation unit, and pixel brightness value inputed to the brightness histogram statistic unit, statistic histogram is up to detecting activity of imagination ED signal.When carrying out above calculating, the incoming video signal image is stored in the external memory storage.
After detecting input picture activity data end signal; The brightness typical value of brightness typical value computing unit calculating input image; And the result is inputed to the time-domain filtering unit carry out filtering; Upgrade the backlight illumination controlling value with filtered, then the backlight illumination controlling value is carried out Nonlinear Processing, with the brightness of result control backlight luminescence.
Simultaneously, input and the corresponding video signal image of current backlight brilliance control value compensate based on the current backlight controlling value from external memory storage, the video signal image after the output compensation.
Here description of the invention and application is illustrative, is not to want with scope restriction of the present invention in the above-described embodiments.Here the distortion of the embodiment that is disclosed and change are possible, and the replacement of embodiment is known with the various parts of equivalence for those those of ordinary skill in the art.Those skilled in the art are noted that under the situation that does not break away from spirit of the present invention or essential characteristic, and the present invention can be with other form, structure, layout, ratio, and realize with other assembly, material and parts.Under the situation that does not break away from the scope of the invention and spirit, can carry out other distortion and change here to the embodiment that is disclosed.
Claims (6)
1. a dynamic backlight liquid crystal display system is characterized in that, said system comprises:
The pixel intensity computing unit is in order to calculate the pixel intensity of the video signal image of importing;
The brightness histogram statistic unit is in order to the brightness histogram of statistics input picture;
Brightness typical value computing unit is in order to calculate the brightness typical value; Begin from brightness histogram high-high brightness grade; The number of pixels of all brightness degrees between current brightness degree and the high-high brightness grade is added up; Like accumulation result greater than a pre-set threshold, the brightness typical value that then current brightness degree is a video signal image; That is:
Wherein, I
rBe the brightness typical value of video signal image, H (i) is a brightness histogram, I
MaxBe maximum brightness value, Thr is a pre-set threshold;
For using the brightness histogram littler than video luminance signal rank, also need change the brightness typical value, this moment, the brightness typical value of video signal image was: I '
r=L*I
r+ L-1; Wherein, L is the gray scale zoom factor;
The time-domain filtering unit carries out time-domain filtering in order to the brightness typical value to video signal image, is the backlight illumination controlling value if filtered, is set the brightness typical value of video signal image less than the brightness typical value of video signal image; Otherwise setting filtered is the backlight illumination controlling value; That is:
Said time-domain filtering unit comprises:
Brightness typical value to video signal image is carried out time-domain filtering:
I
t＝(1-k)*I
t-1+k*I
r
Wherein, I
tBe the time-domain filtering result, k is the time-domain filtering coefficient, is preestablished by the outside;
According to time-domain filtering I as a result
tWith brightness typical value I
rConfirm the backlight illumination controlling value, i.e. I
c=MAX (I
r, I
t);
The video signal image after compensating in order to based on backlight illumination controlling value compensation video signal image, is exported in the compensated video signal unit;
The Nonlinear Processing unit is in order to carry out Nonlinear Processing to the backlight illumination controlling value, the brightness of output result control backlight luminescence;
Said Nonlinear Processing unit carries out Nonlinear Processing to the backlight illumination controlling value and adopts following formula:
Wherein, I
bBe the backlight illumination controlling value of proofreading and correct, I
B, maxBe maximum backlight illumination controlling value, I
MaxBe the vision signal maximum brightness value, γ is a non-linear correction factor, and is consistent with the non-linear response characteristic of liquid crystal panel;
Perhaps, the Nonlinear Processing of said Nonlinear Processing unit realizes with the mode of look-up table LUT.
2. dynamic backlight liquid crystal display system according to claim 1 is characterized in that:
The maximal value of the plain rgb value of said pixel intensity computing unit capture is as brightness value.
3. dynamic backlight liquid crystal display system according to claim 1 is characterized in that:
Said compensated video signal unit calculates by following formula based on backlight illumination controlling value compensation video signal image:
R′＝MIN(I
max，f*R)
G′＝MIN(I
max，f*G)
B′＝MIN(I
max，f*B)
Wherein, MIN is the minimalization operation, and R, G, B are the preceding video signal image pixel value of compensation,
R ', G ', B ' are the video signal image pixel value after compensating, and f is the adjustment coefficient, presses following formula and confirms:
Video signal image before the compensation is current input video, or for there being the video signal image in the storer.
4. a dynamic backlight liquid crystal display method is characterized in that, said method comprises the steps:
The incoming video signal image;
Calculate the pixel intensity of the video signal image of input;
The brightness histogram of statistics input picture;
Calculate the brightness typical value; Begin from brightness histogram high-high brightness grade; The number of pixels of all brightness degrees between current brightness degree and the high-high brightness grade is added up; Like accumulation result greater than a pre-set threshold, the brightness typical value that then current brightness degree is a video signal image;
Brightness typical value to video signal image is carried out time-domain filtering, is the backlight illumination controlling value if filtered, is set the brightness typical value of video signal image less than the brightness typical value of video signal image; Otherwise setting filtered is the backlight illumination controlling value;
Based on the backlight control value compensation video signal image that said time-domain filtering unit obtains, the video signal image after the output compensation;
The backlight illumination controlling value is carried out Nonlinear Processing, the brightness of output result control backlight luminescence.
5. dynamic backlight liquid crystal display method according to claim 4 is characterized in that:
When detecting input picture activity data commencing signal, the brightness of pixel intensity computing unit calculating pixel, and pixel brightness value inputed to the brightness histogram statistic unit, statistic histogram is up to detecting activity of imagination ED signal;
After detecting input picture activity data end signal; The brightness typical value of brightness typical value computing unit calculating input image; And the result is inputed to the time-domain filtering unit carry out filtering; Upgrade the backlight illumination controlling value with filtered, then the backlight illumination controlling value is carried out Nonlinear Processing, with the brightness of result control backlight luminescence;
Simultaneously, the incoming video signal image is compensated the video signal image after the output compensation based on the current backlight controlling value.
6. dynamic backlight liquid crystal display method according to claim 4 is characterized in that:
When detecting input picture activity data commencing signal, the brightness of pixel intensity computing unit calculating pixel, and pixel brightness value inputed to the brightness histogram statistic unit, statistic histogram is up to detecting activity of imagination ED signal; When carrying out above calculating, the incoming video signal image is stored in the external memory storage;
After detecting input picture activity data end signal; The brightness typical value of brightness typical value computing unit calculating input image; And the result is inputed to the time-domain filtering unit carry out filtering; Upgrade the backlight illumination controlling value with filtered, then the backlight illumination controlling value is carried out Nonlinear Processing, with the brightness of result control backlight luminescence;
Simultaneously, input and the corresponding video signal image of current backlight brilliance control value compensate based on the current backlight controlling value from external memory storage, the video signal image after the output compensation.
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| CN102447855B (en) * | 2010-10-08 | 2013-11-20 | Tcl光电科技(惠州)有限公司 | Liquid crystal display television brightness adjustment system and method |
| CN102568386B (en) * | 2010-12-29 | 2015-08-19 | 上海易维视科技有限公司 | Dynamic backlight local control liquid crystal display and system |
| CN102737610B (en) * | 2011-03-31 | 2015-02-11 | 青岛海信电器股份有限公司 | Method and apparatus for adjusting light source brightness, and display device |
| US9082338B2 (en) * | 2013-03-14 | 2015-07-14 | Pixtronix, Inc. | Display apparatus configured for selective illumination of image subframes |
| CN104715735B (en) * | 2015-03-31 | 2017-08-25 | 福州瑞芯微电子股份有限公司 | A kind of method and apparatus of backlight adjustment |
| CN105047145B (en) * | 2015-09-14 | 2017-07-28 | 青岛海信电器股份有限公司 | Backlight brightness control method, backlight brightness control devices and display terminal |
| CN109616040B (en) * | 2019-01-30 | 2022-05-17 | 厦门天马微电子有限公司 | Display device, driving method thereof and electronic equipment |
| CN112927656A (en) * | 2021-01-28 | 2021-06-08 | 武汉海微科技有限公司 | Screen backlight control method and system based on FPGA |
| CN114466147B (en) * | 2021-12-23 | 2024-03-15 | 阿里巴巴（中国）有限公司 | Video brightness adjusting method and device, electronic equipment and storage medium |
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