UPD16647 datasheet(5/16 Pages) NEC

Part #	UPD16647

Description	402/384-OUTPUT TFT-LCD SOURCE DRIVER 64 GRAY SCALE

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Manufacturer	NEC [NEC]

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Data Sheet S13607EJ2V0DS00

5

µµµµ PD16647

4. RELATION BETWEEN INPUT DATA AND OUTPUT VOLTAGE VALUE

The 10 major points on the

γ -characteristic curve of the LCD panel are arbitrarily set by external power supplies V0

through V9. If the display data is 00H or 3FH, gray scale voltage V0 or V9 is output. If the display data is in the range

01H to 3EH, the high-order 3 bits select an external power 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 V8 to V7 and from V1 to V0

are divided into seven segments) to output a 64 gray scale 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

V0

VDD2

V1

V2

V3

V4

V5

V6

V7

V8

07

F

17

1F

Input data (HEX)

27

2F

37

3F

V9

VSS2

gray scale supply specified

by 00H

7 segments

8 segments

7 segments

gray scale supply specified

by 3FH

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 to 7 or 8 segments)

Figure4-1. Relationship between Input Data and

γ-corrected Voltage

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