Gamma+curve+adjustment

Test & Transactions Novatek Microelectronics CorporationCONFIDENTIAL throry Test & Transactions Novatek Microelectronics CorporationCONFIDENTIAL Test & Transactions Novatek Microelectronics CorporationCONFIDENTIAL Test & Transactions Novatek Microelectronics CorporationCONFIDENTIAL Test & Transactions Novatek Microelectronics CorporationCONFIDENTIAL GVDD RP1 RP2 RP3 RP4 RP5 RP6 RP7 8 to 1 SEL 8 to 1 SEL 8 to 1 SEL 8 to 1 SEL 8 to 1 SEL 8 to 1 SEL KVP1 KVP2 KVP3 KVP4 KVP5 KVP6 KVP7 KVP8 VINP1 PKP0[2:0] VINP0 PKP1[2:0] RP8 RP9 RP10 RP11 RP12 RP13 RP14 KVP9 KVP10 KVP11 KVP12 KVP13 KVP14 KVP15 KVP16 PRP0[2:0] VRP0[3:0] RP0 RP15 PKP2[2:0] RP16 RP17 RP18 RP19 RP20 RP21 RP22 KVP17 KVP18 KVP19 KVP20 KVP21 KVP22 KVP23 KVP24 VINP2 VINP3 RP23 PKP3[2:0] PKP4[2:0] VINP4 VINP5 PRP1[2:0] VINP6 RP24 RP25 RP26 RP27 RP28 RP29 RP30 KVP25 KVP26 KVP27 KVP28 KVP29 KVP30 KVP31 KVP32 RP31 RP32 RP33 RP34 RP35 RP36 RP37 RP38 KVP33 KVP34 KVP35 KVP36 KVP37 KVP38 KVP39 KVP40 KVP0 PKP5[2:0] RP39 RP40 RP41 RP42 RP43 RP44 RP45 KVP41 KVP42 KVP43 KVP44 KVP45 KVP46 KVP47 KVP48 VRP1[4:0] VINP7 5R VRP0 0 to 30R RP46 KVP49 VRP1 0 to 31R EXVR 1R VRHP 0 to 28R 5R 1R 16R 1R 5R 1R VRLP 0 to 28R 4R 5R RN1 RN2 RN3 RN4 RN5 RN6 RN7 8 to 1 SEL 8 to 1 SEL 8 to 1 SEL 8 to 1 SEL 8 to 1 SEL 8 to 1 SEL KVN1 KVN2 KVN3 KVN4 KVN5 KVN6 KVN7 KVN8 VINN1 PKN0[2:0] VINN0 PKN1[2:0] RN8 RN9 RN10 RN11 RN12 RN13 RN14 KVN9 KVN10 KVN11 KVN12 KVN13 KVN14 KVN15 KVN16 PRN0[2:0] VRN0[3:0] RN0 RN15 PKN2[2:0] RN16 RN17 RN18 RN19 RN20 RN21 RN22 KVN17 KVN18 KVN19 KVN20 KVN21 KVN22 KVN23 KVN24 VINN2 VINN3 RN23 PKN3[2:0] PKN4[2:0] VINN4 VINN5 PRN1[2:0] VINN6 RN24 RN25 RN26 RN27 RN28 RN29 RN30 KVN25 KVN26 KVN27 KVN28 KVN29 KVN30 KVN31 KVN32 RN31 RN32 RN33 RN34 RN35 RN36 RN37 RN38 KVN33 KVN34 KVN35 KVN36 KVN37 KVN38 KVN39 KVN40 KVN0 PKN5[2:0] RN39 RN40 RN41 RN42 RN43 RN44 RN45 KVN41 KVN42 KVN43 KVN44 KVN45 KVN46 KVN47 KVN48 VRN1[4:0] VINN7 5R VRN0 0 to 30R RN46 KVN49 VRN1 0 to 31R 1R VRHN 0 to 28R 5R 1R 16R 1R 5R 1R VRLN 0 to 28R 4R 5R 4R4R RP478R RN478R Structure of Gamma correction circuit Test & Transactions Novatek Microelectronics CorporationCONFIDENTIAL Note: Adjust by register setting Test & Transactions Novatek Microelectronics CorporationCONFIDENTIAL How to fit gamma curve (1)Measurement V-T curve (2)Decide the T0 level(最亮階) according to Brightness spec. (3)Decide the T63 level(最暗階) according to C/R spec. (4)According to the gamma curve you desired(ex. Gamma 2.2), calculate the T1~T62 transmittance. (5)Find the V0~V63 voltage according to V-T curve, it’s an idea G-V curve(Gray to voltage). (6) Vertical Flip the Idea Pos. G-V curve base on ½ VCOMA, then get Idea Neg. G-V curve (7) Decide the Top rail & bottom rail of Gamma ladder resistor (GVDD & VGS) (8)Adjust the register of Excel table, until you can match the the adjusted curve to idea curve (9)Obtain the gamma curve according to these registers, check if the G-T curve meet gamma 2.2. Test & Transactions Novatek Microelectronics CorporationCONFIDENTIAL (1)Measurement V-T curve (pos/neg polarity) Test & Transactions Novatek Microelectronics CorporationCONFIDENTIAL (2)Decide the T0 level(最亮階) according to Brightness spec. T0 T0 > Brightness spec.>T0_min. Test & Transactions Novatek Microelectronics CorporationCONFIDENTIAL T0 >T0_min. (3)Decide the T63 level(最暗階) according to C/R spec. T0/T63 > CR spec. T63 Max(V0_P, V0_N)+0.2V VGS< Min(V63_P, V0_N)-0.2V Gray V0_P V63_P V Idea G-V Curve 0 63…………………………………… V0_N V63_N ½ VCOMA Test & Transactions Novatek Microelectronics CorporationCONFIDENTIAL (8)Adjust the register of Excel table, until you can match the the adjusted curve to idea curve G-V curve 0.000 1.000 2.000 3.000 4.000 5.000 6.000 0 3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60 63 Gray V ol t idea_POS idea_NEG POS NEG Test & Transactions Novatek Microelectronics CorporationCONFIDENTIAL (9)Obtain the gamma curve according to these registers, check if the G-T curve meet gamma 2.2. Gamma Control Register Reg. No IB[15:0] R30h 00 00 R31h 03 05 R32h 00 03 R33h 04 01 R34h 04 07 R35h 05 04 R36h 07 07 R37h 00 07 R3Ah 0D 00 R3Bh 00 0F Probe Color analyzer Pattern Gen. (1)Send Gary0 to Gary 63 pattern(full screen), Measure the luminance of each gray (2)Normalized the luminance (3)Compare with idea gamma curve Panel Test & Transactions Novatek Microelectronics CorporationCONFIDENTIAL Gray-T curve 0 0.2 0.4 0.6 0.8 1 1.2 0 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 63 code (0-63) T Idea adjust Gray levelcd/m2 T(normalized) 0 3.22 0.029009009 4 3.69 0.033243243 8 4.56 0.041081081 12 5.57 0.05018018 16 7.18 0.064684685 20 9.39 0.084594595 24 13.3 0.11981982 28 21.9 0.197297297 32 31.3 0.281981982 36 42.3 0.381081081 40 57.6 0.518918919 44 74.4 0.67027027 48 91.3 0.822522523 52 100 0.900900901 56 105 0.945945946 60 109 0.981981982 63 111 1 C/R 34.47205 Test & Transactions Novatek Microelectronics CorporationCONFIDENTIAL Thank you!