ST7541 datasheet(21/78 Pages) SITRONIX

21 / 78 page

ST7541

Ver 1.9

21/78

2007/9/3

LCD DISPLAY CIRCUITS

FRC (Frame Rate Control) and PWM (Pulse Width Modulation) Function Circuit

ST7541 incorporates FRC function and PWM circuits to display a 4-level gray scale. The FRC function and PWM utilize

liquid crystal characteristics whose transmittance is changed by an effective value of applied voltage. ST7541 provides

palette-registers to assign the desired gray level. These registers are set by the instructions and the RST.

4FRC & 3FRC vs. 9PWM, 12PWM, 15PWM

– Gray Scale Table of 4 FRC (Frame Rate Control)

Gray scale level

MSB (DB7 to DB4)

LSB (DB3 to DB0)

2nd FR (FR2)

1st FR (FR1)

White

4th FR (FR4)

3rd FR (FR3)

2nd FR (FR2)

1st FR (FR1)

Light gray

4th FR (FR4)

3rd FR (FR3)

2nd FR (FR2)

1st FR (FR1)

Dark gray

4th FR (FR4)

3rd FR (FR3)

2nd FR (FR2)

1st FR (FR1)

Black

4th FR (FR4)

3rd FR (FR3)

– Gray Scale Table of 3 FRC (Frame Rate Control)

Gray scale level

MSB (DB7 to DB4)

LSB (DB3 to DB0)

2nd FR (FR2)

1st FR (FR1)

White

XXXX

3rd FR (FR3)

2nd FR (FR2)

1st FR (FR1)

Light gray

XXXX

3rd FR (FR3)

2nd FR (FR2)

1st FR (FR1)

Dark gray

XXXX

3rd FR (FR3)

2nd FR (FR2)

1st FR (FR1)

Black

XXXX

3rd FR (FR3)

– Gray Scale Table of PWM (Pulse Width Modulation)

Frame Parameter (FRn)

15-PWM

12-PWM

9-PWM

Dec

Hex

4-bit

PWM width

Note

PWM width

Note

PWM width

Note

0000

0(0/15)

Brighter

0(0/12)

Brighter

0(0/9)

Brighter

0001

1/15

1/12

1/9

0010

2/15

2/12

2/9

0011

3/15

3/12

3/9

0100

4/15

4/12

4/9

0101

5/15

5/12

5/9

0110

6/15

6/12

6/9

0111

7/15

7/12

7/9

1000

8/15

8/12

8/9

1001

9/15

9/12

1(9/9)

Darker

1010

10/15

10/12

1011

11/15

11/12

1100

12/15

1(12/12)

Darker

1101

13/15

1110

14/15

1111

1(15/15)

Darker

0/12

This field is

OFF level

0/9

This field is

OFF level

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