CN104050922B - The method of rapid build OLED display Gamma correction look-up table - Google Patents
The method of rapid build OLED display Gamma correction look-up table Download PDFInfo
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Abstract
A kind of method <b> of rapid build OLED display Gamma correction look-up table, </b> belongs to OLED display display characteristic optimisation technique field, especially the display characteristic being directed to OLED display carries out Gamma correction, makes OLED display possess the method for the rapid build OLED display Gamma correction look-up table of more excellent display effect.The method of rapid build OLED display Gamma correction look-up table of the present invention, is characterized in that this correction exports by 9 the process corresponding to 8 inputs to realize.Does the present invention only need the 0 gray-scale intensity side-play amount measuring OLED display exponent gamma 1 and the expectation of α, display brightness characteristic curve correct the gamma coefficient gamma 2 reached, gamma correction table can be calculated fast, this technology is simple, effective, is easy to realize and promote.
Description
Technical field
The invention belongs to OLED display display characteristic optimisation technique field, the display characteristic being especially directed to OLED display carries out Gamma correction, makes OLED display possess the method for the rapid build OLED display Gamma correction look-up table of more excellent display effect.
Background technology
OLED display can be widely used in every field, the use brightness of target under different occasion, photoelectric transformation efficiency are all different with characteristic, simultaneously, because the production link of OLED display is more complicated, the more difficult control of production technology, between different production batch, photoelectric characteristic neither be very consistent, and the photoelectric properties that so result in every a slice display can be inconsistent, product needs when supporting display system uses once to correct every a slice display, meets the consistent of each display characteristics.
Gray scale curve is the family curve of display different GTG and brightness relationship, is used for expressing the display characteristic of display, and OLED display has similar feature, i.e. non-linear display with CRT and LED display technique.The vision system of the mankind for display brightness or sensation roughly in logarithmic relationship, and and nonlinear relationship, identical with original image in order to ensure the image that display presents, need in the display introduce Gamma correction, display gray scale curve is debugged, to reach the best visual effect.
Gamma correct be in order to overcome this non-linear and introduce a kind of transition function.Different gray scale curves can show image quality characteristic and the visual effect of different images, has notable difference in the power of human eye to brightness, therefore needs to correct the gray scale curve of display, to make display system obtain desirable display effect.Therefore, need the OLED display Gamma method of adjustment setting up complete set, make display display effect can finally reach consistent, to its large-scale business application of propelling, significant.
Generally, due to the display characteristic difference of visual environment and display device, when Gamma value is usually between 2.2-2.5, reach the visual effect of human eye the best.The display device do not corrected through Gamma can affect final export picture quality, cause display distortion, because the original Gamma value of OLED display device is larger, be generally about 2.7-3, namely imaging will make image darkening, therefore Gamma timing is being carried out, need to make image brightening, to offset the impact of original display equipment, usually choose the Gamma value between 0-1.Gamma corrects and adopts brightness look-up table (10bit register) to realize, the further refinement of brightness value stored to make frame buffer brightness look-up table, directly brightness value is not stored in frame buffer brightness look-up table, but store the address of brightness value, search corresponding brightness value according in address to brightness look-up table, the bit wide of searching address need be greater than allocation index bit wide.
Summary of the invention
The object of the invention is the Gamma bearing calibration proposing a kind of OLED display, use to reach optimizing display rear end, reach optimal display result, meet the needs instructing large-scale commercial applications to apply simultaneously.
The method of rapid build OLED display Gamma correction look-up table of the present invention, it is characterized in that this correction exports by 9 the process corresponding to 8 inputs to realize, concrete grammar comprises the following steps:
1), measure the original brightness of OLED display before Gamma correction, obtain gradation characteristic data, and some starting brightness being just greater than 0 moves to initial point, then, brightness y and gray scale x variable is normalized, obtains original gradation curve; To original gradation curve exponential function:
formula carry out matching, obtain characteristic curve index
;
2), regulate video signal source, export the full frame monochrome signal of 0 GTG, i.e. full frame black signal;
3), under dark room conditions, now room brilliancy measurement value is 0, from 0, step value is 1, arranges the correction value output LUT [0] when gamma correction table is input as 0, now corresponding 9 starting points exported of the value of LUT [0], 0 position is moved to the position of curve starting brightness, and the brightness of synchro measure OLED display, when the brightness measured starts to be greater than 0, record corrected value LUT [0] is now initial bright values;
4), the gamma correction factor that reaches expected by set and display device
;
5), according to following formula, calculate and bill of store byte signless integer type gamma correction curve data:
Wherein:
Int []: represent data round numbers part in square brackets;
: be input digital video signal maximal value, for 8 signals, equal 255, namely 2
8-1;
N: be gamma correction curve tables of data index value, for 256 point calibration curves, span is 0 to 255;
: the OLED brightness exponent obtained for step 1 matching;
: for expecting the gamma correction factor reached;
6), according to following formula, Gamma correction look-up table LUT is built:
Wherein:
N: be Gamma correction look-up table index value is identical with the n in step 5) formula;
a: the starting brightness value obtained for step 3) measurement;
: the maximal value that gamma correction table exports, for 9 output calibration tables, exports as 0-511, i.e. 512 outputs;
: be the byte signless integer type gamma correction curve data obtained in step 5);
7), by the Gamma correction look-up table LUT built in step 6) write the corresponding register of the built-in gamma correction table of display successively, complete the Gamma correction of display.
N value in described step 5), span is 256 numerical value between 0 to 255, and the numbers such as 256 numerical value are divided into several numerical value section, and divide numerical value hop count more, its computational accuracy is higher.
In the trimming process of display, export figure place and must be greater than input figure place and just can complete correction to input signal, regular display adopts the supplied with digital signal of 8 usually, and therefore 9 output signals can meet the alignment requirements of 8 input signals.As the D/A conversion adopting the output of more seniority to mean more seniority, extra calculated amount can be increased, higher requirement is had to IC design.
The present invention only needs the 0 gray-scale intensity side-play amount measuring OLED display
, display brightness characteristic curve index
the gamma coefficient reached is corrected with expecting
, can calculate gamma correction table fast, this technology is simple, effective, is easy to realize and promote.
Accompanying drawing explanation
Fig. 1 is original grey scale curve and characteristic curve index in invention step 1)
curve map.
Embodiment
Example one: the SVGA060 type OLED minitype displayer product of 0.6 inch of 800 × 600 resolution of producing for Yunnan North Aoleide Actinoelectricity Technology Co., Ltd., correct, concrete aligning step is:
1) the Gamma correction function of SVGA060 display, is closed, measure the original brightness of SVGA060 display before Gamma correction, i.e. gradation characteristic data, and some starting brightness being just greater than 0 moves to initial point, brightness y and gray scale x variable are normalized, obtain display normalization brightness curve data, use exponential function simultaneously:
formula carry out matching, obtain characteristic curve index
=3;
2), regulate video signal source, export the full frame monochrome signal of 0 GTG, namely full frame black is to SVGA060 display;
3), under dark room conditions, when the setting value arranging the built-in gamma correction table LUT [0] of SVGA060 equals 250, indicator screen brightness becomes 0.1 from 0, obtains starting brightness side-play amount=250;
4), set and display device expects that the gamma correction factor reached is
=2.2;
5), according to formula
, and n value is divided into 16 numerical value sections, 16 numerical value sections have 17 points, and calculate 17 byte signless integer type gamma correction curve tables of data G [n]=(0,33,55,74,92,108,124,139,153,167,181,194,207,219,231,243,255);
6), according to formula
build 9 Gamma correction look-up table LUT [n]=(250,284,307,326,345,361,377,393,407,422,436,449,463,475,487,500,511);
7), by the Gamma correction look-up table LUT built in step 6) write the corresponding register of the built-in gamma correction table of SVGA060 successively, complete the Gamma correction of SVGA060 display.
Example two: the SXGA060 type OLED minitype displayer product explanation of 0.6 inch of 1280 × 1024 resolution of producing for Yunnan North Aoleide Actinoelectricity Technology Co., Ltd..
1) the Gamma correction function of SXGA060 display, is closed, measure the original brightness-gradation characteristic data of SXGA060 display before Gamma correction, and some starting brightness being just greater than 0 moves to initial point, by brightness (y) and gray scale (x) variable be normalized, obtain display normalization brightness curve data, with exponential function:
formula carry out matching, obtain characteristic curve index
=3;
2), regulate video signal source, export the full frame monochrome signal of 0 GTG, to SXGA060 display;
3), under dark room conditions, the gamma correction table LUT_R [0] of built-in R, G, the B of SXGA060 tri-passages, LUT_G [0] are set respectively, the setting value of LUT_B [0] is when equaling 330, indicator screen brightness becomes 0.1 from 0, obtains starting brightness side-play amount=330;
4), set and display device expects that the gamma correction factor reached is
=2.2.
5), according to formula
, calculating and obtaining 256 byte signless integer type gamma correction curve tables of data is G [n]=(0, 4, 7, 9, 12, 14, 16, 18, 20, 21, 23, 25, 27, 28, 30, 31, 33, 35, 36, 37, 39, 40, 42, 43, 45, 46, 47, 49, 50, 51, 53, 54, 55, 56, 58, 59, 60, 61, 63, 64, 65, 66, 67, 69, 70, 71, 72, 73, 74, 76, 77, 78, 79, 80, 81, 82, 83, 84, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 159, 160, 161, 162, 163, 164, 165, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 177, 178, 179, 180, 181, 182, 182, 183, 184, 185, 186, 186, 187, 188, 189, 190, 191, 191, 192, 193, 194, 195, 195, 196, 197, 198, 199, 199, 200, 201, 202, 203, 203, 204, 205, 206, 207, 207, 208, 209, 210, 211, 211, 212, 213, 214, 214, 215, 216, 217, 218, 218, 219, 220, 221, 221, 222, 223, 224, 225, 225, 226, 227, 228, 228, 229, 230, 231, 231, 232, 233, 234, 234, 235, 236, 237, 237, 238, 239, 240, 240, 241, 242, 243, 243, 244, 245, 246, 246, 247, 248, 249, 249, 250, 251, 252, 252, 253, 254, 255),
6), according to publicity
, build 10 Gamma correction look-up table LUT [n]=(330, 341, 349, 354, 363, 368, 373, 379, 384, 387, 393, 398, 403, 406, 412, 414, 420, 425, 428, 431, 436, 439, 444, 447, 452, 455, 458, 463, 466, 469, 474, 477, 479, 482, 488, 490, 493, 496, 501, 504, 507, 509, 512, 518, 520, 523, 526, 528, 531, 537, 539, 542, 545, 547, 550, 553, 556, 558, 564, 566, 569, 572, 575, 577, 580, 583, 585, 588, 591, 594, 596, 599, 602, 604, 607, 610, 613, 615, 618, 621, 624, 626, 629, 632, 634, 637, 640, 643, 645, 648, 651, 653, 656, 659, 662, 664, 667, 670, 672, 675, 678, 681, 683, 686, 689, 691, 691, 694, 697, 700, 702, 705, 708, 710, 713, 716, 719, 721, 721, 724, 727, 729, 732, 735, 738, 740, 743, 743, 746, 749, 751, 754, 757, 759, 762, 762, 765, 768, 770, 773, 776, 778, 778, 781, 784, 787, 789, 792, 795, 795, 797, 800, 803, 806, 808, 811, 811, 814, 816, 819, 822, 825, 825, 827, 830, 833, 835, 835, 838, 841, 844, 846, 849, 849, 852, 855, 857, 860, 860, 863, 865, 868, 871, 871, 874, 876, 879, 882, 882, 884, 887, 890, 893, 893, 895, 898, 901, 903, 903, 906, 909, 912, 912, 914, 917, 920, 922, 922, 925, 928, 931, 931, 933, 936, 939, 941, 941, 944, 947, 950, 950, 952, 955, 958, 958, 960, 963, 966, 966, 969, 971, 974, 974, 977, 980, 982, 982, 985, 988, 990, 990, 993, 996, 999, 999, 1001, 1004, 1007, 1007, 1009, 1012, 1015, 1015, 1018, 1020, 1023),
7), by the Gamma correction look-up table LUT [n] built in step 6 write successively in the corresponding register of gamma correction table of built-in RGB tri-passages of SXGA060, complete the Gamma correction to SXGA060 display.
Claims (2)
1. a method for rapid build OLED display Gamma correction look-up table, it is characterized in that this correction exports by 9 the process corresponding to 8 inputs to realize, concrete grammar comprises the following steps:
1), measure the original brightness of OLED display before Gamma correction, obtain gradation characteristic data, and some starting brightness being just greater than 0 moves to initial point, then, brightness y and gray scale x variable is normalized, obtains original gradation curve; To original gradation curve exponential function:
formula carry out matching, obtain characteristic curve index
;
2), regulate video signal source, export the full frame monochrome signal of 0 GTG, i.e. full frame black signal;
3), under dark room conditions, now room brilliancy measurement value is 0, from 0, step value is 1, arranges the correction value output LUT [0] when gamma correction table is input as 0, now corresponding 9 starting points exported of the value of LUT [0], 0 position is moved to the position of curve starting brightness, and the brightness of synchro measure OLED display, when the brightness measured starts to be greater than 0, record corrected value LUT [0] is now initial bright values;
4), the gamma correction factor that reaches expected by set and display device
;
5), according to following formula, calculate and bill of store byte signless integer type gamma correction curve data:
Wherein:
Int []: represent data round numbers part in square brackets;
: be input digital video signal maximal value, for 8 signals, equal 255, namely 2
8-1;
N: be gamma correction curve tables of data index value, for 256 point calibration curves, span is 0 to 255;
: the OLED brightness exponent obtained for step 1 matching;
: for expecting the gamma correction factor reached;
6), according to following formula, Gamma correction look-up table LUT is built:
Wherein:
N: be Gamma correction look-up table index value is identical with the n in step 5) formula;
a: the starting brightness value obtained for step 3) measurement;
: the maximal value that gamma correction table exports, for 9 output calibration tables, exports as 0-511, i.e. 512 outputs;
: be the byte signless integer type gamma correction curve data obtained in step 5);
7), by the Gamma correction look-up table LUT built in step 6) write the corresponding register of the built-in gamma correction table of display successively, complete the Gamma correction of display.
2. the method for rapid build OLED display Gamma correction look-up table as claimed in claim 1, it is characterized in that the n value in described step 5), span is 256 numerical value between 0 to 255, the numbers such as 256 numerical value are divided into several numerical value section, divide numerical value hop count more, its computational accuracy is higher.
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| CN109036262A (en) * | 2018-09-06 | 2018-12-18 | 长春希达电子技术有限公司 | The display characteristic curve correcting method and control system of medical LED display |
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Application publication date: 20140917 Assignee: Kunming BOE Display Technology Co., Ltd. Assignor: Yunnan North OLiGHTEK Opto-Electronic Technology Co., Ltd. Contract record no.: 2018530000014 Denomination of invention: Method for quickly establishing gamma correction lookup table of OLED displayer Granted publication date: 20160323 License type: Exclusive License Record date: 20181015 |