Relationship Table between PWM Data and Gray Scale

HT1647

Rev. 1.30

9

November 10, 2005

V a l u e

5 b i t s P W M d a t a

P W M

( O N w i d t h ) G r a y S c a l e

B 4

B 3

B 2

B 1

B 0

0

1

2

3

4

5

6

7

8

9

1 0

1 1

1 2

1 3

1 4

1 5

1 6

1 7

1 8

1 9

2 0

2 1

2 2

2 3

2 4

3 1

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

1

1

1

1

1

1

1

1

1

1

1

1

0

1

0

1

0

1

1 ( 2 4 / 2 3 )

1 ( 3 1 / 2 3 )

0

0

0

0

0

0

1

1

1

1

1

1

1

1

0

0

0

0

0

0

0

0

1

1

1

1

0

0

0

0

1

1

1

1

0

0

0

0

0

0

0

0

1

1

1

1

0

0

0

1

1

1

0

0

0

1

1

1

0

0

0

1

1

1

0

0

0

1

1

1

0

0

1

1

0

0

1

1

0

0

1

1

0

0

1

1

0

0

1

1

0

0

1

1

0 ( 0 / 2 3 )

1 / 2 3

2 / 2 3

3 / 2 3

4 / 2 3

5 / 2 3

6 / 2 3

7 / 2 3

8 / 2 3

9 / 2 3

1 0 / 2 3

1 1 / 2 3

1 2 / 2 3

1 3 / 2 3

1 4 / 2 3

1 5 / 2 3

1 6 / 2 3

1 7 / 2 3

1 8 / 2 3

1 9 / 2 3

2 0 / 2 3

2 1 / 2 3

2 2 / 2 3

1 ( 2 3 / 2 3 )

Table 1: FRAME 89Hz Mode

V a l u e

5 b i t s P W M d a t a

P W M

( O N w i d t h ) G r a y S c a l e

B 4

B 3

B 2

B 1

B 0

0

1

2

3

4

5

6

7

8

9

1 0

1 1

1 2

1 3

3 1

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

1

1

1

1

1

1 ( 3 1 / 1 2 )

0

0

0

0

0

0

1

1

1

1

1

1

1

1

0

0

0

0

0

0

0

0

1

1

1

1

0

0

0

1

1

1

0

0

0

1

1

1

0

0

0

1

0

0

1

1

0

0

1

1

0

0

1

1

0 ( 0 / 1 2 )

1 / 1 2

2 / 1 2

3 / 1 2

4 / 1 2

5 / 1 2

6 / 1 2

7 / 1 2

8 / 1 2

9 / 1 2

1 0 / 1 2

1 1 / 1 2

1 ( 1 2 / 1 2 )

1 ( 1 3 / 1 2 )

Table 2: FRAME 170Hz Mode

Note:

The varied PWM data displays various gray scale

in TN-type, STN-type LCDs.

The color display derives from ECB-type LCD

¢s

specification.

Name

Command Code

Function

GRS LEVEL 1

X100-001 B4-B3 B2 B1 B0-XXXX

Set PWM data in gray scale level 1

GRS LEVEL 2

X100-010 B4-B3 B2 B1 B0-XXXX

Set PWM data in gray scale level 2

GRS LEVEL 3

X100-011 B4-B3 B2 B1 B0-XXXX

Set PWM data in gray scale level 3

GRS LEVEL 4

X100-100 B4-B3 B2 B1 B0-XXXX

Set PWM data in gray scale level 4

Four Kinds of Gray Scale Level Command Code

1 6

1

2

V 1

V 2

V 3

V 4

C O M

W

W '

V 1

V 2

V 3

V 4

S E G

W

W '

C O M ~ S E G

1 f r a m e

O N

O F F

O N

N o t e : " W ' " R e a l a c t i v e s e g m e n t s i g n a l w i d t h ( a d j u s t a b l e w i d t h b y P W M d a t a )

" W " M a x . a c t i v e s e g m e n t s i g n a l w i d t h

P W M ( O N w i d t h ) : W ' / W , 0 £ W ' / W £ 1 ( r e f e r t o t a b l e 1 & t a b e l 2 )

1 6

1

2

Example of Waveform (B Type) in 1/5 Bias, 1/16 Duty Cycle Drive