CN103413540A - Brightness adjusting method of LED display screen - Google Patents
Brightness adjusting method of LED display screen Download PDFInfo
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- CN103413540A CN103413540A CN2013103477821A CN201310347782A CN103413540A CN 103413540 A CN103413540 A CN 103413540A CN 2013103477821 A CN2013103477821 A CN 2013103477821A CN 201310347782 A CN201310347782 A CN 201310347782A CN 103413540 A CN103413540 A CN 103413540A
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Abstract
The invention discloses a brightness adjusting method of an LED display screen. Gray level grading of gray level data of an input video signal is achieved through the LED display screen in a subfield method. The brightness adjusting method includes the steps of carrying out non-linear transformation on n-bit gray level data of the input video signal, mapping the n-bit gray level data to m-bit gray level data, wherein m is larger than n, and at least changing the sum of subfields occupied by the m-bit gray level data to achieve brightness adjustment of the LED display screen. According to the brightness adjusting method, the mode that gray level data after reverse Gamma correction are multiplied by a brightness coefficient to lower the brightness of the LED display screen is changed, therefore the problem that the low gray level loses when the brightness of the LED display screen is lowered in the prior art does not occur.
Description
Right of priority
Patented claim of the present invention require the applying date be October 12, application number in 2012 be 201210388257.X, denomination of invention for " not losing the LED display brightness adjusting method of low gray scale " and the applying date be that October 12, application number in 2012 are 201210391788.4, denomination of invention is two domestic priority in first to file of " a kind of by adding the method for subfield adjusting LED display luminance efficiency ", these two all the elements in first to file are in this as reference.
Technical field
The invention belongs to LED display control system field, relate in particular to a kind of brightness adjusting method of LED display.
Background technology
Existing control system there will be low gray scale to lose when reducing the brightness of LED display problem, cause the display effect variation.
Due to the linear response characteristic of LED, current LED display is controlled and need to be carried out the n position gradation data of incoming video signal after anti-Gamma correction is mapped to m position gradation data doing the gray scale realization again, and m is greater than n.If x is the input gray level data, codomain is 0 to (2
n-1), y is the gradation data after anti-Gamma correction, and codomain is 0 to (2
m-1), γ is gamma value, and mapping relations are as follows:
When needs reduced the brightness of LED display, existing technology was that the y value after anti-gamma directly is multiplied by a brightness number percent, such as needs drop to 50% by brightness, just the y value is taken advantage of to 0.5.
The problem that this way can cause has:
1. the y value of less x value mapping is 0, and the result that causes these gray levels to realize is (not the working) of deceiving.
2. many identical y values of x value mapping, cause these gray levels to realize that effect is identical.
These two problems can cause the low gradation effect variation of display screen.
Summary of the invention
Therefore, the present invention, for overcoming defect of the prior art, provides a kind of brightness adjusting method of LED display.
Particularly, the brightness adjusting method of a kind of LED display provided by the invention, described LED display realizes gray shade scale to the gradation data of incoming video signal by the subfield method, described brightness adjusting method comprises: the n position gradation data of incoming video signal is carried out to nonlinear transformation and be mapped to m position gradation data, and m is greater than n; And the subfield that takies that changes at least described m position gradation data counts summation, to realize the brightness regulation of described LED display.
In an embodiment of the present invention, the above-mentioned subfield that takies that changes at least m position gradation data is counted the step of summation and can be comprised: the subfield that takies that reduces described m position gradation data is counted summation; And the subfield weight summation that reduces described m position gradation data, the weight when wherein arbitrarily the subfield weight of position gradation data equals this gradation data and realizes and take the product of subfield number.Further, the described m of above-mentioned minimizing position gradation data take subfield count the step of summation can comprise reduce take the subfield number be non-" 1 " high-order gradation data take the subfield number; The above-mentioned step that reduces the subfield weight summation of described m position gradation data can comprise the weight reduced when taking the subfield number and realizing for the low level gradation data of " 1 ".
In an embodiment of the present invention, the above-mentioned subfield that takies that changes at least m position gradation data is counted the step of summation and can be comprised: the subfield that takies that increases described m position gradation data is counted summation.Further, the subfield that takies of the described m of above-mentioned increase position gradation data is counted the step of summation and can be comprised the part position gradation data in the gradation data of described m position is added and takies the subfield number.In addition, the above-mentioned subfield that takies that changes at least m position gradation data is counted the step of summation and also can be comprised: keep the subfield weight summation of described m position gradation data constant, the weight when wherein the subfield weight of position gradation data equals this gradation data and realizes arbitrarily and take the product of subfield number.Wherein, keep the constant step of subfield weight summation of described m position gradation data can comprise the weight when reducing in the gradation data of described m position to be added the every gradation data that takies the subfield number realizes.
In an embodiment of the present invention, the value of the said n value that is more than or equal to 6, m is more than or equal to 10.
In an embodiment of the present invention, above-mentioned nonlinear transformation can comprise anti-Gamma correction.
In addition, the brightness adjusting method of another kind of LED display provided by the invention, described LED display realizes gray shade scale to the gradation data of incoming video signal by the subfield method, the brightness adjusting method of described LED display comprises the following steps: the n position gradation data of incoming video signal is carried out to nonlinear transformation and be mapped to m position gradation data, wherein m is greater than n; And change the subfield weight summation of described m position gradation data and take the ratio that subfield is counted summation, to realize the brightness regulation of described LED display, the weight when wherein arbitrarily the subfield weight of position gradation data equals this gradation data and realizes and take the product of subfield number.
In an embodiment of the present invention, the subfield weight summation of the described m of above-mentioned change position gradation data with take subfield and count the step of the ratio of summation and can comprise: the subfield weight summation that reduces described m position gradation data with take subfield and count summation; The subfield that takies that perhaps keeps the subfield weight summation of described m position gradation data and increase described m position gradation data is counted summation.
In an embodiment of the present invention, the value of the said n value that is more than or equal to 6, m is more than or equal to 10; Above-mentioned nonlinear transformation can comprise anti-Gamma correction.
As from the foregoing, for example, by changing at least the gradation data after nonlinear transformation (anti-Gamma correction) the subfield weight summation that takies the gradation data after subfield is counted summation or changed nonlinear transformation of the present invention with take the ratio that subfield is counted summation, realize the brightness regulation of LED display, change the gradation data of tradition after anti-Gamma correction and taken advantage of the mode of luminance factor to reduce the brightness of LED display, therefore not there will be in prior art the problem of losing low gray scale while reducing LED display brightness.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below the specific embodiment of the present invention is described in detail.
For n position (bit) gradation data of incoming video signal, carry out after anti-Gamma correction is mapped to m position gradation data at present, general LED display adopts on-off formula constant-current driven chip driving LED screen body, m position gradation data y value after anti-Gamma correction is to realize gray shade scale by the subfield method, also namely by the subfield arranged mode, realize gray shade scale, each subfield is sent certain 1 of gradation data, and the opening time that drives chip by control is realized the weight of this 1 gradation data.It is worth mentioning that, for LED display, its physics brightness is directly proportional to gray-scale value, if do not proofreaied and correct, obviously can not meet the requirement of color rendition, therefore need to do anti-Gamma correction to gradation data, also namely carry out nonlinear transformation, after overcorrect, can guarantee the full backup of LED display color.In the present embodiment, the value of m is greater than the value of n, and wherein the value of the m value that is more than or equal to 10, n is more than or equal to 6.
The m of below take equals 16 and is example, and a kind of common subfield arranged mode is as follows, and the subfield number that takies of its most significant digit gradation data is 32, specifically referring to the listed subfield arranged mode `1 of lower subordinate list one:
Table one, subfield arranged mode 1
As can be known from table one, arranged mode 1 realizes that a gray scale need to amount to 73 subfields, also namely taking subfield, to count summation be 73, during gradation data maximum (being that each bit is 1), driving chip adds up to opening time to take 64 subfields, be also that subfield weight summation is 64, the luminance efficiency of this arranged mode 1 is:
η=(subfield weight summation/take subfield to count summation)=(64/73)=87.6%
[the first embodiment]
The brightness adjusting method of the LED display that first embodiment of the invention provides, the method that for example reduces brightness is to realize by the subfield number that takies that reduces the high bit gradation data, and the subfield mode of counting that takies that specifically reduces the high bit gradation data can be referring to the listed subfield arranged mode `2 of lower subordinate list two.
Table two, subfield arranged mode 2
Comparison sheet two can find out with table one, and the subfield number that takies of the most significant digit in table two (15bit) gradation data is reduced to 16 by 32, and other high positions (14bit～11bit) the subfield number that takies of gradation data is reduced to respectively 8,4,2,1; In brief, for table one, the subfield number that takies in table two is that the subfield number of the high-order gradation data of non-" 1 " is reduced, and (subfield that takies of 0～15bits) gradation data is counted summation and is reduced to 42 thereby cause 16.In addition, (weight when 0～10bits) gradation data is realized all is reduced the subfield number that takies in table two for the low level of " 1 ".Weight and the product that takies the subfield number when due to any subfield weight of position gradation data, equaling this bit and realize, so table two is for table one, the subfield weight summation of 16 gradation datas is reduced to 32.Therefore, the luminance efficiency of this arranged mode 2 is reduced to:
η=(subfield weight summation/take subfield to count summation)=(32/42)=76.2%
Similarly, referring to the listed subfield arranged mode 3 of subordinate list three, its mode to the reduction brightness of table two is similar, and difference is the subfield number that takies of most significant digit gradation data is reduced to 8 by 32, and correspondingly, the luminance efficiency of this arranged mode 3 is reduced to:
η=(subfield weight summation/take subfield to count summation)=(16/27)=59.2%
Table three, subfield arranged mode 3
As can be seen here, by above-mentioned table two and these two kinds of methods of table three, can change the luminance efficiency of LED display, a plurality of subfield arranged modes can be set like this and realize a plurality of brightness commonly used.When certain brightness of needs, call this subfield arranged mode and get final product.
[the second embodiment]
The brightness adjusting method of the LED display that second embodiment of the invention provides, the method that for example reduces brightness are to realize by the subfield number that takies that adds part position gradation data.The concrete mode that takies the subfield number of adding part position gradation data can be referring to the listed subfield arranged mode 4 of lower subordinate list four.
Table four, subfield arranged mode 4
Comparison sheet four can find out with table one, and the addition that takies the subfield number of the 9～12bits gradation data in table four is followed successively by 3,7,6,4, the subfield number that takies also namely amount to added is 20, and (subfield that takies of 0～15bits) gradation data is counted summation and is increased to 93 thereby cause 16.In addition, for table one, the weight when being added the 9～12bits gradation data that takies the subfield number in table four and realizing all is reduced.It is 64 constant that weight and the product that takies the subfield number when due to any subfield weight of position gradation data, equaling this bit and realize, so table four is for table one, the subfield weight summation of 16 gradation datas still remain.Therefore, the luminance efficiency of this arranged mode 4 is reduced to:
η=(subfield weight summation/take subfield to count summation)=(64/93)=68.8%
At this, it should be noted that, the subfield number that always takies added in second embodiment of the invention is not limited to 20, individual, can decide according to the demand of practical application; And position and the quantity of adding these gradation datas that take the subfield number are not restricted yet.
As from the foregoing, for example, by changing at least the gradation data after nonlinear transformation (anti-Gamma correction) the subfield weight summation that takies the gradation data after subfield is counted summation or changed nonlinear transformation of above-mentioned each embodiment of the present invention with take the ratio that subfield is counted summation, realize the brightness regulation (for example reducing luminance efficiency) of LED display, change the gradation data of tradition after anti-Gamma correction and taken advantage of the mode of luminance factor to reduce the brightness of LED display, therefore not there will be in prior art the problem of losing low gray scale while reducing LED display brightness.
In addition, be understandable that, the various embodiments described above are to take the value of m as 16 as an example, for m, are the situation of other values, and brightness adjusting method provided by the invention stands good.Be understandable that, the value of m can be 20,24, or other values.Similarly, the value of n can be 6,8 numerical value such as grade.
Applied specific case herein principle and the embodiment of the brightness adjusting method of LED display of the present invention are set forth, the explanation of above embodiment is just be used to helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention; all will change in specific embodiments and applications; in sum, this description should not be construed as limitation of the present invention, and protection scope of the present invention should be as the criterion with appended claim.
Claims (14)
1. the brightness adjusting method of a LED display, described LED display realizes gray shade scale to the gradation data of incoming video signal by the subfield method, it is characterized in that, the brightness adjusting method of described LED display comprises the following steps:
The n position gradation data of incoming video signal is carried out to nonlinear transformation and be mapped to m position gradation data, and m is greater than n; And
At least the subfield that takies that changes described m position gradation data is counted summation, to realize the brightness regulation of described LED display.
2. the brightness adjusting method of LED display according to claim 1, is characterized in that, the described subfield that takies that changes at least described m position gradation data is counted the step of summation and comprised:
The subfield that takies that reduces described m position gradation data is counted summation; And
Reduce the subfield weight summation of described m position gradation data, the weight when wherein arbitrarily the subfield weight of position gradation data equals this gradation data and realizes and take the product of subfield number.
3. the brightness adjusting method of LED display according to claim 2, is characterized in that, the subfield that takies of the described m of described minimizing position gradation data is counted the step of summation and comprised:
Reduce take the subfield number be non-" 1 " high-order gradation data take the subfield number.
4. according to the brightness adjusting method of claim 2 or 3 described LED display, it is characterized in that, the described step that reduces the subfield weight summation of described m position gradation data comprises:
Reduce the weight when taking the subfield number and realizing for the low level gradation data of " 1 ".
5. the brightness adjusting method of LED display according to claim 1, is characterized in that, the described subfield that takies that changes at least described m position gradation data is counted the step of summation and comprised:
The subfield that takies that increases described m position gradation data is counted summation.
6. the brightness adjusting method of LED display according to claim 5, is characterized in that, the subfield that takies of the described m of described increase position gradation data is counted the step of summation and comprised:
Part position gradation data in the gradation data of described m position is added and takies the subfield number.
7. according to the brightness adjusting method of claim 5 or 6 described LED display, it is characterized in that, the described subfield that takies that changes at least described m position gradation data is counted the step of summation and is also comprised:
Keep the subfield weight summation of described m position gradation data constant, the weight when wherein arbitrarily the subfield weight of position gradation data equals this gradation data and realizes and take the product of subfield number.
8. the brightness adjusting method of LED display according to claim 7, is characterized in that, the constant step of subfield weight summation of the described m of described maintenance position gradation data comprises:
Weight when reducing in the gradation data of described m position to be added the every gradation data that takies the subfield number and realizing.
9. the brightness adjusting method of LED display according to claim 1, is characterized in that, the value of described n is more than or equal to 6, and the value of described m is more than or equal to 10.
10. the brightness adjusting method of LED display according to claim 1, is characterized in that, described nonlinear transformation comprises anti-Gamma correction.
11. the brightness adjusting method of a LED display, described LED display realizes gray shade scale to the gradation data of incoming video signal by the subfield method, it is characterized in that, the brightness adjusting method of described LED display comprises the following steps:
The n position gradation data of incoming video signal is carried out to nonlinear transformation and be mapped to m position gradation data, wherein m is greater than n; And
Change the subfield weight summation of described m position gradation data and take the ratio that subfield is counted summation, to realize the brightness regulation of described LED display, the weight when wherein arbitrarily the subfield weight of position gradation data equals this gradation data and realizes and take the product of subfield number.
12. the brightness adjusting method of LED display according to claim 11, is characterized in that, the subfield weight summation of the described m of described change position gradation data with take subfield and count the step of the ratio of summation and comprise:
Reduce the subfield weight summation of described m position gradation data and take subfield to count summation; Perhaps
The subfield that takies that keeps the subfield weight summation of described m position gradation data and increase described m position gradation data is counted summation.
13. the brightness adjusting method of LED display according to claim 11, is characterized in that, the value of described n is more than or equal to 6, and the value of described m is more than or equal to 10.
14. the brightness adjusting method of LED display according to claim 11, is characterized in that, described nonlinear transformation comprises anti-Gamma correction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310347782.1A CN103413540B (en) | 2012-10-12 | 2013-08-09 | The brightness adjusting method of LED display |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210388257.X | 2012-10-12 | ||
| CN201210388257XA CN102903329A (en) | 2012-10-12 | 2012-10-12 | Light emitting diode (LED) display screen brightness regulating method without loss of low gray scale |
| CN2012103917884 | 2012-10-12 | ||
| CN201210388257X | 2012-10-12 | ||
| CN2012103917884A CN102903330A (en) | 2012-10-12 | 2012-10-12 | Method for regulating brightness efficiency of LED (light-emitting diode) display screen through adding sub-field |
| CN201210391788.4 | 2012-10-12 | ||
| CN201310347782.1A CN103413540B (en) | 2012-10-12 | 2013-08-09 | The brightness adjusting method of LED display |
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| CN103413540B CN103413540B (en) | 2016-04-13 |
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| CN106297657A (en) * | 2016-09-27 | 2017-01-04 | 广东欧珀移动通信有限公司 | The brightness adjusting method of a kind of AMOLED display screen and terminal |
| CN109326265A (en) * | 2016-08-18 | 2019-02-12 | 联发科技股份有限公司 | A kind of method and brightness control system of the brightness of adjusting panel |
| CN111833809A (en) * | 2020-07-17 | 2020-10-27 | 云谷（固安）科技有限公司 | Display screen control method and device |
| CN112599075A (en) * | 2020-05-28 | 2021-04-02 | 西安诺瓦星云科技股份有限公司 | Display module correction method, device and system |
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| CN106297657A (en) * | 2016-09-27 | 2017-01-04 | 广东欧珀移动通信有限公司 | The brightness adjusting method of a kind of AMOLED display screen and terminal |
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Address after: 710075 DEF101, Zero One Square, Xi'an Software Park, No. 72 Zhangbajie Science and Technology Second Road, Xi'an High-tech Zone, Shaanxi Province Patentee after: XI'AN NOVASTAR TECH Co.,Ltd. Address before: 710075 Qinfengge D District 401, Xi'an Software Park, 68 Science and Technology Second Road, Xi'an High-tech Zone, Shaanxi Province Patentee before: Xi'an NovaStar Tech Co.,Ltd. |