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UPD16640C Datasheet(PDF) 5 Page - NEC |
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UPD16640C Datasheet(HTML) 5 Page - NEC |
5 / 16 page Data Sheet S11269EJ1V1DS00 5 µµµµ PD16640C 4. RELATION BETWEEN INPUT DATA AND OUTPUT VOLTAGE VALUE The 11 major points on the γ-characteristic curve of the LCD panel are arbitrarily set by external power supplies V0 through V10. If the display data is 00H or 3FH, gray scale voltage V0 or V10 is output. If the display data is in the range 01H to 3EH, the high-order 3 bits select an external powers pair Vn+1, Vn. The low-order 3 bits evenly divide the range of Vn+1, Vn into eight segments by means of D/A conversion (however, the ranges from V9 to V8 and from V2 to V1 are divided into seven segments) to output a 64-grayscale voltage. DX5 (MSB) DX4 DX3 DX2 DX1 DX0 (LSB) DX5 DX4 DX3 Vn+1-Vn 00 0 V1-V2 00 1 V2-V3 01 0 V3-V4 01 1 V4-V5 10 0 V5-V6 10 1 V6-V7 11 0 V7-V8 11 1 V8-V9 Vn Vn+1 000 1 001 2 010 3 011 4 100 5 101 6 110 7 111 8 DX2-DX0 High-order 3 bits : γ-corrected power selected (Vn+1-Vn) Low-order 3 bits : 3-bit D/A (range Vn-Vn+1 is divided into 7 or 8 segments) Figure 4-1. Relation between Input Data and γγγγ -corrected Voltage 0.1 V 0.1 V V1 V2 V3 V4 V5 V6 V7 V8 V9 07 F 17 1F Input data (HEX) 27 2F 37 3F VDD2 V0 VSS2 V10 gray scale supply specified by 00H 7 segments 8 segments 8 segments 8 segments 8 segments 8 segments 8 segments 7 segments gray scale supply specified by 3FH |
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