CN101183513B - Backlight processing system and method thereof - Google Patents
Backlight processing system and method thereof Download PDFInfo
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- CN101183513B CN101183513B CN2007101280635A CN200710128063A CN101183513B CN 101183513 B CN101183513 B CN 101183513B CN 2007101280635 A CN2007101280635 A CN 2007101280635A CN 200710128063 A CN200710128063 A CN 200710128063A CN 101183513 B CN101183513 B CN 101183513B
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Abstract
A backlight processing system and a method thereof are provided. The gray level values of pixels in an input frame signal are adjusted and the brightness thereof is decreased correspondingly. During gray level value adjustment, the gray level values of the pixels in dark regions are reduced, and the gray level values of the pixels in bright regions are increased. During backlight adjustment, first, statistics information on distribution of the gray level value versus the number of pixels is obtained according to the gray level distribution of the original frame. The number of pixels at each gray level is accumulated. When the accumulation value reaches a certain value, a reference signal is obtained. The brightness of the backlight is then adjusted according to the reference signal.
Description
Technical field
The invention relates to a kind of backlight processing system and its method, and particularly about a kind of contrast of picture light and shade and backlight processing system and its method of adjusting backlight illumination of improving.
Background technology
The electronic installation of early stage tool LCD screen is for reaching the saving power consumption, can adjust luminosity from module backlight, or during by user's operating electronic devices, the user adjusts the brightness of module backlight voluntarily, therefore can reach easy electricity-saving function, but picture quality can be affected, for traditional backlight power saving design, sometimes it is bright or dark excessively to adjust mistake backlight, all may cause the sticky feeling when viewing and admiring.
Another prior art then discloses according to picture signal, backlight control is dynamically adjusted, please refer to Fig. 1, Fig. 1 illustrates the backlight processing system Organization Chart of prior art, in this prior art, picture signal can input to indicative control unit (Display Control Portion) 14, unit such as mean flow rate detecting unit (AverageBrightness Detecting Portion) 15 and the highest detecting unit (Peak Detecting Portion) 16, to handle, wherein, indicative control unit 14 will be imported picture signal and be converted to 11 data forms that can show of LCD Panel, mean flow rate detecting unit 15 averages brightness calculation at picture signal, and the average luminance signal AVE of gained is sent to backlight control unit 13 as adjustment parameter backlight, the highest detecting unit 16 carries out the computing of mxm. (peak value) to obtain highest signal PEK for the picture element signal of different pictures signal, and transmitting this highest signal PEK gives backlight control unit 13 as adjustment backlight, then, backlight control unit 13 makes a decision according to reference average signal AVE and highest signal PEK, to carry out the backlight illumination adjustment, yet, though this prior art can be adjusted display frame and reach the power saving effect, but the combination of shown picture and backlight illumination, it is dark partially to think obviously that for common people's eyes picture shows, can feel tired when therefore viewing and admiring, uncomfortable.
Summary of the invention
Problem to be solved by this invention provides a kind of backlight processing system, adjusts backlight illumination and the pixel of picture signal is done suitable adjustment, and adjusted picture quality is as the raw frames quality, but can save power consumption.
The present invention provides a kind of disposal route backlight again, can increase the light and shade contrast of picture pixel, and can reduce the consumption that backlight illumination reaches saving power, and the output picture can have comfortable visual effect.
The technical scheme of taking of the present invention is to propose a kind of backlight processing system, it comprises pixel transitions unit, picture signal distribution unit, picture signal judging unit and adjustment assessment unit backlight, and the pixel transitions unit is adjusted pixel gray level value and is exported a LCD Panel to according to picture signal in order to receive a picture signal.The picture signal distribution unit receives picture signal, do the statistics of GTG value according to the pixel gray level distribution scenario of picture signal to pixel distribution quantity, take out a maximum gray value of each pixel in the picture signal, calculate a pixel distribution quantity of each GTG value, and output GTG value concerns data to one of pixel distribution quantity, the picture signal judging unit is coupled to the output of picture signal distribution unit, the picture signal judging unit is according to concerning that data obtains a reference signal, this reference signal is used for representing the bright-dark degree of picture, adjustment assessment unit backlight is coupled to the output of picture signal judging unit, this adjustment assessment unit backlight carries out adjustment backlight according to reference signal, and then adjust the backlight illumination of a module backlight, and module backlight is in order to send light to LCD Panel.
In the above-mentioned backlight processing system, table look-up according to one and change picture signal in the pixel transitions unit.The picture signal judging unit pixel distribution quantity that adds up, when accumulation result during more than or equal to a ratio quantity of total pixel of picture signal, the output reference signal, wherein reference signal is the corresponding GTG value of accumulation result, adjustment assessment unit backlight removes according to reference signal, and according to first reference value, second reference value, higher limit and lower limit, export an adjusted value backlight, adjustment output valve backlight is in order to adjust the backlight illumination of module backlight, wherein when reference signal is between first reference value and lower limit, with first adjusted value as adjusted value backlight; When reference signal is between first reference value and second reference value, with second adjusted value as adjusted value backlight; When reference signal was between second reference value and higher limit, adjusted value backlight was expressed as follows:
Backdim＝APGL/UP，
Wherein, Backdim represents adjusted value backlight, and APGL represents reference signal, and UP represents higher limit.
From another viewpoint, the present invention proposes a kind of disposal route backlight in addition, it comprises the following steps: that a picture signal adjustment, a mean pixel GTG are analyzed and an adjustment assessment backlight, and picture signal set-up procedure, receive picture signal, the pixel of conversion picture signal also is sent to LCD Panel; Mean pixel GTG analytical procedure receives picture signal, exports a reference signal; And adjustment appraisal procedure backlight, root
In the above-mentioned disposal route backlight, mean pixel GTG analytical procedure comprises the following steps: that also a picture signal distributes and a picture signal is judged, and the step that picture signal distributes is exported the data that concerns of GTG value and pixel distribution quantity according to the pixel gray level distribution scenario of picture signal; Then, the step that picture signal is judged, after reception concerned data and carries out analysis and judgement, output can be carried out the reference signal of adjustment backlight.
Backlight processing system of the present invention is done the appropriate brightness adjustment because of the pixel that adopts picture signal and the output of backlight illumination, therefore along with the input of different picture signals, backlight processing system can suitably adjust the light and shade contrast of picture pixel, and the light-source brightness adjustment of cooperation minimizing, can make the display frame of output, make human eye perceives comfortable, the effect that is presented is as the raw frames quality, but can reach the saving power consumption.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 is existing backlight processing system Organization Chart.
Fig. 2 is the backlight processing system Organization Chart of one embodiment of the invention.
Fig. 3 is the input pixel of pixel transitions unit of Fig. 2 and the GTG mapping relations figure of output pixel.
Fig. 4 is the input pixel of pixel transitions unit and the tabling look-up of output pixel GTG value of Fig. 2.
Fig. 5 (a) is GTG value and pixel distribution quantitative relation figure.
Fig. 5 (b) is the method synoptic diagram that calculates reference signal from Fig. 5 (a).
Fig. 6 (a) is the process flow figure backlight of another embodiment of the present invention.
Fig. 6 (b) is the detail flowchart of the treatment step backlight of the embodiment of the invention.
Embodiment
In order to improve the shortcoming of prior art, reach adjusted picture quality as the raw frames quality, in an embodiment of the present invention, can adjust the light and shade contrast of the pixel of raw frames signal.In addition, save institute backlight consumed power for reaching, the embodiment of the invention is suitably adjusted backlight illumination according to picture signal.
Please refer to Fig. 2, Fig. 2 illustrates the backlight processing system Organization Chart of one embodiment of the invention.Backlight processing system 200 comprises pixel transitions unit 210, mean pixel GTG analytic unit 220 and adjustment assessment unit 230 backlight.Wherein, mean pixel GTG analytic unit 220 comprises picture signal distribution unit 221 and picture signal judging unit 222, the relation of coupling of above-mentioned each unit is as follows, pixel transitions unit 210 is in order to receive picture signal, adjust the GTG value and be sent to LCD Panel 250 according to picture signal and show, picture signal distribution unit 221 receives picture signal, the output of picture signal distribution unit 221 is coupled to picture signal judging unit 222, the output of picture signal judging unit 222 is coupled to adjustment assessment unit 230 backlight, the output of adjustment assessment unit 230 backlight is coupled to module 240 backlight, then, the embodiment of the invention is described.
Please refer to Fig. 3, Fig. 3 illustrates the input pixel of pixel transitions unit 210 and the GTG mapping relations figure of output pixel.Two lines are arranged: solid line and dotted line among Fig. 3, the solid line representative is not made any GTG value and is changed, that is the GTG value of input pixel equals the GTG value of output pixel, dotted line then is the transformation curve that embodiments of the invention adopted, RGB is (red with signal, green, indigo plant) convert signal R ' G ' B ' to, by this transformation curve, the pixel that belongs to dark attitude scope 301 will reduce pixel gray level value, so can become when showing than darker before not adjusting, and the pixel that belongs to bright attitude scope 302 will increase pixel gray level value, so output can become when showing than brighter before not adjusting, so can strengthen the light and shade contrast of pixel, be reinforced owing to belong to the pixel of bright attitude, when backlight illumination reduced, shown image quality can keep the vividness of original color on LCD Panel 250.
The transformation curve of above-mentioned Fig. 3 also can have several different manifestation modes, below lists three kinds of expression modes, when knowing that the present invention is not limited to this.
(1)
F (x)=255 (when x＞a);
F (x)=[255/ (a-x)] * x (when x≤a).
(2)
F (x)=0 (when x＜a);
F (x)=[255/ (255-a)] * (x-a) (when x 〉=a).
(3)
F (x)=0 (when x≤a);
F (x)=255 (when x 〉=b);
F (x)=[255/ (b-a)] * (x-a) (when a＜x＜b).
X is the GTG value of input signal, and f (x) is the GTG value of output signal, and a and b are two GTG reference values.
For the backlight processing system 200 with present embodiment is implemented in the small-medium size electronic display unit, also the input pixel and the output pixel GTG value relation of the transformation curve of Fig. 3 can be integrated in table look-up (look-up table), more to reduce design complexities.
Please refer to Fig. 4, Fig. 4 illustrates the input pixel gray level value RGB of the embodiment of the invention and tabling look-up of output pixel GTG value R ' G ' B ', (or the extrapolation computing of utilization interpolative operation, other similar algorithms), can obtain all output pixel GTG values, in addition, pixel transitions unit 210 transformation curve that uses not necessarily has only one, according to different static state or dynamic image type and can use different transformation curves.
Mean pixel GTG analytic unit 220 can carry out suitable interpretation action for picture signal, please refer to Fig. 5 (a) and Fig. 5 (b), and it illustrates the graph of a relation of the GTG value and the pixel distribution quantity that are a complete picture.
GTG value among Fig. 5 (a) and Fig. 5 (b) is represented the maximum gray value in each pixel, generally comprising three RGB sub-pixels with a pixel is example, the GTG value of some pixels is (red, green, blue)=(80,150,180), then the maximum gray value of this pixel is 180, and picture signal distribution unit 221 can obtain the pixel distribution quantity of each GTG value with the maximum gray value taking-up of all pixels of a picture, as Fig. 5 (a), such as, the picture signal resolution is the image of 320*240, then can obtain (320*240) individual maximum gray value.
According to Fig. 5 (a), picture signal judging unit 222 receives from the GTG value of picture signal distribution unit 221 data that concerns to pixel distribution quantity, and carry out analysis and judgement, carry out the accumulation calculating of pixel distribution quantity to the direction of low GTG value by the high gray value as Fig. 5 (b), when accumulation result during more than or equal to this picture total pixel number purpose N% (N be on the occasion of), worthwhile signal APGL for referencial use of pairing GTG and output, in Fig. 5 (b), if N=25, and APGL is such as being 180, and mean pixel GTG analytic unit 220 provides reference signal APGL to adjustment assessment unit 230 backlight according to said method, and adjustment assessment unit 230 backlight is done the backlight illumination adjustment according to reference signal APGL again.
In addition, the method of Fig. 5 (b), picture signal judging unit 222 also can be by doing accumulating operation in the other direction, that is, carry out accumulating operation from low GTG value to high gray value direction, if accumulation result is during more than or equal to (100-N) %, then with the value of the worthwhile signal APGL for referencial use of pairing GTG, then, mean pixel GTG analytic unit 220 output reference signal APGL are to adjustment assessment unit 230 backlight.
Suppose that adjustment assessment unit 230 backlight also utilizes parameter P, Q, Mb and Nb to export adjusted value BackDim backlight, wherein 0＜Q＜P＜255, and 0＜Mb＜Nb＜1, adjusted value BackDim backlight can be expressed as follows:
BackDim=APGL/255 (when P＜APGL≤255);
BackDim=Mb is (as Q＜APGL≤P);
BackDim=Nb is (as 0≤APGL≤Q).
Above-mentioned parameter is such as being Mb=0.7, Nb=0.9, and Q=120 and P=180,0 is lower limit, 255 is higher limit.When the value of reference signal APGL between 0～120, representative input picture signal 201 belongs to partially secretly, so adjusted value BackDim backlight is set as 0.9, can allow the people feel that image is too dark too much to avoid backlight illumination to fall.
Equally, when the value of reference signal APGL between 120～180, represent backlight illumination will fall some more, so adjusted value BackDim backlight is set as 0.7, in addition, when the value of reference signal APGL between 180～255, adjusted value BackDim backlight is APGL/255.
What deserves to be mentioned is that the pre-set parameter of the invention described above embodiment is not limit the value of being supposed, can select the parameter setting of best of breed according to the module backlight 240 and LCD Panel 250 of arrange in pairs or groups use; Perhaps do various settings,, carry out the backlight illumination adjustment with suitable calculation mode and parameter at different application environment or different images pattern.
See also Fig. 6 (a), Fig. 6 (a) illustrates the process flow figure backlight of another embodiment of the present invention.Disposal route backlight is as follows, as step S601, after receiving picture signal, as step S602, adjust picture signal, and the conversion of step S602 is for example tabled look-up according to one and is adjusted the pixel gray level value of this picture signal, when the pixel of picture signal belongs to pixel as the dark attitude scope 301 of Fig. 3, reduces pixel gray level value; Perhaps when the pixel of picture signal belongs to pixel as the bright attitude scope 302 of Fig. 3, increase pixel gray level value, step S603 according to the pixel gray level distribution scenario of picture signal, exports reference signal for another example, the person of connecing is as step S604, receive this reference signal and carry out adjustment backlight, to adjust the backlight illumination of light source, again according to step S605, according to the backlight illumination of light source, show the picture signal after changing.
See also Fig. 6 (b), illustrate the detailed content of step S603, above-mentioned steps S603 also comprises the following steps, as step S603a, take out the maximum gray value of each pixel in this picture signal, calculate a pixel distribution quantity of each GTG value, concern data (shown in Fig. 5 a) with what obtain GTG value and pixel distribution quantity, step S603b for another example, this is concerned that the pixel distribution quantity of data carries out accumulation calculating (shown in Fig. 5 b), and step S603c is when accumulation result during more than or equal to a ratio quantity of the total pixel of image of picture signal, then with the worthwhile signal for referencial use of pairing GTG.
According to the explanation of the foregoing description as can be known, in the present embodiment, backlight processing system can be adjusted pixel intensity according to the pixel gray level value of input picture signal, it is bright dark to analyze picture, calculate and adjust the backlight illumination supervisor, have different adjustment backlight for difference input picture signal, and picture signal is suitably adjusted to obtain suitable image quality, thus, when the user watches image, keep display quality, and the demonstration of picture contrast also can obtain to promote, have the power saving function and moderately adjust backlight illumination, so present embodiment can be implemented on the small-medium size electronic display unit, also backlight processing system can be embedded on the integrated circuit.
Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.
Claims (18)
1. backlight processing system comprises:
One pixel transitions unit in order to receive a picture signal, is adjusted this picture signal according to this and is exported a LCD Panel to;
One picture signal distribution unit, receive this picture signal, do the statistics of GTG value according to the pixel gray level distribution scenario of this picture signal to pixel distribution quantity, take out a maximum gray value of each pixel in this picture signal, calculate a pixel distribution quantity of each GTG value, and output GTG value concerns data to one of pixel distribution quantity;
One picture signal judging unit is coupled to the output of this picture signal distribution unit, and this picture signal judging unit concerns that according to this data obtains a reference signal, and this reference signal is used for representing the bright-dark degree of this picture signal; And
One adjustment assessment unit backlight, be coupled to the output of this picture signal judging unit, this adjustment assessment unit backlight carries out adjustment backlight according to this reference signal, and to adjust the backlight illumination of a module backlight, this module backlight is in order to send light to this LCD Panel.
2. backlight processing system as claimed in claim 1 is characterized in that this pixel transitions unit reduces the pixel gray level value of this picture signal.
3. backlight processing system as claimed in claim 1 is characterized in that this pixel transitions unit improves the pixel gray level value of this picture signal.
4. backlight processing system as claimed in claim 1 is characterized in that, tables look-up according to one and change this picture signal in this pixel transitions unit.
5. backlight processing system as claimed in claim 4 is characterized in that, this picture signal is changed with an interpolative operation in this pixel transitions unit.
6. backlight processing system as claimed in claim 4 is characterized in that, this picture signal is changed with an extrapolation computing in this pixel transitions unit.
7. backlight processing system as claimed in claim 1, it is characterized in that, this picture signal judging unit those pixel distribution quantity that add up, when accumulation result during more than or equal to a ratio quantity of total pixel of this picture signal, export this reference signal, and this reference signal is the corresponding GTG value of accumulation result.
8. backlight processing system as claimed in claim 1 is characterized in that:
When this reference signal was between one first reference value and a lower limit, this adjustment assessment unit backlight was exported one first adjusted value to carry out adjustment backlight; And
When this reference signal was between this first reference value and one second reference value, this adjustment assessment unit backlight was exported one second adjusted value to carry out adjustment backlight.
9. backlight processing system as claimed in claim 8 is characterized in that, when this reference signal was between this second reference value and a higher limit, this adjustment assessment unit backlight was exported one the 3rd adjusted value to carry out adjustment backlight, and the 3rd adjusted value is expressed as follows:
Backdim＝APGL/UP，
Wherein, Backdim represents the 3rd adjusted value, and APGL represents this reference signal, and UP represents this higher limit.
10. disposal route backlight comprises:
Receive a picture signal;
Adjust this picture signal;
Take out a maximum gray value of each pixel in this picture signal, calculate a pixel distribution quantity of each GTG value, and output GTG value concerns data to one of pixel distribution quantity;
Carry out the accumulation calculating that this concerns the pixel quantity of data, when the accumulation result of those pixel distribution quantity during more than or equal to a ratio quantity of the total pixel of this picture signal, with worthwhile work one reference signal of pairing GTG and output;
Receive this reference signal, adjust the backlight illumination of a light source according to this reference signal; And
According to the backlight illumination of this light source, show this picture signal after changing.
11. disposal route backlight as claimed in claim 10 is characterized in that, adjusts this picture signal step and comprises:
Reduce the pixel gray level value of this picture signal.
12. disposal route backlight as claimed in claim 10 is characterized in that, adjusts this picture signal step and comprises:
Increase the pixel gray level value of this picture signal.
13. disposal route backlight as claimed in claim 10 is characterized in that, adjusts this picture signal step and also comprises:
According to one table look-up the conversion this picture signal.
14. disposal route backlight as claimed in claim 13 is characterized in that, adjusts this picture signal step and comprises:
Utilize an interpolative operation to change this picture signal.
15. disposal route backlight as claimed in claim 13 is characterized in that, adjusts this picture signal step and comprises:
Utilize an extrapolation computing to change this picture signal.
16. disposal route backlight as claimed in claim 10 is characterized in that, the backlight illumination step of adjusting this light source according to this reference signal comprises:
When this reference signal is between one first reference value and a lower limit, export one first adjusted value to adjust the backlight illumination of this light source.
17. disposal route backlight as claimed in claim 16 is characterized in that, the backlight illumination step of adjusting this light source according to this reference signal comprises:
When this reference signal is between this first reference value and one second reference value, export one second adjusted value to adjust the backlight illumination of this light source.
18. disposal route backlight as claimed in claim 17 is characterized in that, the backlight illumination step of adjusting this light source according to this reference signal comprises:
When this reference signal is between this second reference value and a higher limit, export one the 3rd adjusted value to adjust the backlight illumination of this light source, the 3rd adjusted value is expressed as follows:
Backdim＝APGL/UP，
Wherein, Backdim represents the 3rd adjusted value, and APGL represents this reference signal, and UP represents this higher limit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US86544606P | 2006-11-13 | 2006-11-13 | |
| US60/865,446 | 2006-11-13 |
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| CN101183513A CN101183513A (en) | 2008-05-21 |
| CN101183513B true CN101183513B (en) | 2011-03-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101399909B (en) * | 2007-09-28 | 2011-05-04 | 奇景光电股份有限公司 | Adaptive image regulating method and image processing device using the method |
| TWI419128B (en) | 2008-10-02 | 2013-12-11 | Lg Display Co Ltd | Liquid crystal display and method of driving the same |
| CN101673515B (en) * | 2009-10-15 | 2011-05-18 | 硅谷数模半导体（北京）有限公司 | Dynamic backlight control method |
| TWI419131B (en) * | 2009-12-30 | 2013-12-11 | Wintek Corp | System and method for modulating backlight |
| CN102129840B (en) * | 2010-01-15 | 2013-02-13 | 胜华科技股份有限公司 | Backlight modulating system and method |
| TWI444987B (en) * | 2010-07-09 | 2014-07-11 | Realtek Semiconductor Corp | Contrast control device and method thereof |
| TWI483616B (en) * | 2010-08-09 | 2015-05-01 | Chunghwa Picture Tubes Ltd | Display apparatus, display contorl module and display control method |
| CN102820008B (en) * | 2011-06-10 | 2015-04-01 | 晨星软件研发(深圳)有限公司 | Display control circuit and method |
| CN103035210B (en) * | 2013-01-15 | 2015-07-29 | 惠州Tcl移动通信有限公司 | The screen-vision screen extended method of mobile terminal and system |
| CN103793873B (en) * | 2014-01-26 | 2017-06-13 | 大唐移动通信设备有限公司 | The acquisition methods and device of image pixel intermediate value |
| CN104125373A (en) * | 2014-07-09 | 2014-10-29 | 福州华映视讯有限公司 | Image processing method of transparent display system |
| CN105047140A (en) * | 2015-07-06 | 2015-11-11 | 西安交通大学 | Self-adapting dynamic backlight control system and method based on image content |
| CN107293265B (en) * | 2017-06-12 | 2020-08-28 | 深圳Tcl新技术有限公司 | Display screen picture adjusting method, display terminal and readable storage medium |
| TWI788983B (en) | 2021-08-30 | 2023-01-01 | 瑞昱半導體股份有限公司 | Video signal processing device and method |
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| TWI356384B (en) | 2012-01-11 |
| TW200822033A (en) | 2008-05-16 |
| CN101183513A (en) | 2008-05-21 |
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