MPT57481

240-CHANNEL 61-BIT SOURCE DRIVER FOR COLOR TFT LCDS

SGLS099 – MARCH 1997

4

POST OFFICE BOX 655303

bias voltage can be adjusted to tailor the pixel output voltages needed for the particular LCD panel. GMA and

VOP voltages affect all outputs, while WB0, WB1, and WB2 voltages affect only the 3n–2, 3n–1, or 3n outputs,

respectively.

calculation of subpixel output voltage

Theoretical calculation of analog voltage with no process deviations assumed.

V

(m

) 1) VA(n ) 1) ) (7 * m) VA(n)

8

m: Upper 3 bits of 6-bit data

n: Lower 3 bits of 6-bit data

(1)

VAd

+ VOP )

8 VOP

* GMA(d ) 1)

7

) VOP * Vk

7

Vk:WB0, WB1, and WB2

d = 0 – 8

(2)

graphical representation of output voltage

Calculation of analog voltage is shown graphically in Figure 1. The graph represents the output voltage verse

6-bit data input.

(VA1 + VA0

× 7)/8

VA0

VA1

VA2

VA3

VA4

VA5

VA6

VA7

VA8

0

1

7

F

17

1F

27

2F

37

3E

3F

6 -Bit Data Input

Figure 1. Output Voltage Verse 6-Bit Data Input