UPD16640C datasheet(5/16 Pages) NEC

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Data Sheet S11269EJ1V1DS00

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

V1-V2

V2-V3

V3-V4

V4-V5

V5-V6

V6-V7

V7-V8

V8-V9

Vn+1

000

001

010

011

100

101

110

111

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

Input data (HEX)

VDD2

VSS2

V10

gray scale supply specified

by 00H

7 segments

8 segments

7 segments

gray scale supply specified

by 3FH

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