Data Sheet S12581EJ1V0DS00

5

µµµµ PD16640B

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 to 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)

High-order 3 bits :

γ-corrected power selected

(Vn, Vn+1)

Low-order 3 bits : 3-bit D/A

(range Vn to Vn+1 is divided into 7 or 8 segnents)

DX5

0

0

0

0

1

1

1

1

DX4

0

0

1

1

0

0

1

1

DX3

0

1

0

1

0

1

0

1

Vn to Vn+1

V1 to V2

V2 to V3

V3 to V4

V4 to V5

V5 to V6

V6 to V7

V7 to V8

V8 to V9

1

2

3

4

5

6

7

8

Vn

000 001 010 011 100 101 110 111

Vn+1

DX2 to DX0

7 segments

8 segments

8 segments

8 segments

8 segments

8 segments

8 segments

7 segments

Gray-scale supply specified

by 00H

Gray-scale supply specified

by 3FH

Input data (HEX)

V1

V2

V3

V4

V5

V6

V7

V8

V9

0.1 V

VDD2

V0

0.1 V

V10

VSS2

Figure4

−1. Relationship between Input Data and γ-corrected Voltage