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ST7787 Datasheet(PDF) 205 Page - Sitronix Technology Co., Ltd.

Part # ST7787
Description  262K Color Single-Chip TFT Controller/Driver
PDF  217 Pages
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Manufacturer  SITRONIX [Sitronix Technology Co., Ltd.]
Direct Link  http://www.sitronix.com.tw
Logo SITRONIX - Sitronix Technology Co., Ltd.

ST7787 Datasheet(HTML) 205 Page - Sitronix Technology Co., Ltd.

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ST7787
Ver. 1.7
2008.04.18
205
13. Gamma structure
13.1 STRUCTURE OF GRAYSCALE AMPLIFIER
The structure of grayscale amplifier is shown as below. 13 voltage levels (VIN0-VIN12) between GVDD and VGS are
determined by the high/ mid/ low level adjustment registers. Each mid-adjustment level is split into 64 levels again by the
internal ladder resistor network. As a result, grayscale amplifier generates 64 voltage levels ranging from V0 to V63 and
outputs one of 64 levels.
Positive frame
Negative frame
GVDD
0~2
2.5
R
RF0P[3:0]
0~3
0R
RF1P[3:0]
PKP0[3:0]
PKP1[4:0]
PKP2[4:0]
PKP3[4:0]
PKP4[4:0]
PKP5[4:0]
PKP6[4:0]
PKP7[4:0]
PKP8[3:0]
0~2
8R
OS1P[2:0]
0~2
2.5
R
OS0P[3:0]
30R
30R
V0
V1
V3
V6
V11
V20
V31
V43
V52
V57
V60
V62
V63
Step : 2R
Step : 1.5R
Step : 4R
Step : 1.5R
184R
GVDD
0~2
2.5
R
OS0N[3:0]
0~2
8R
OS1N[2:0]
PKN0[3:0]
PKN1[4:0]
PKN2[4:0]
PKN3[4:0]
PKN4[4:0]
PKN5[4:0]
PKN6[4:0]
PKN7[4:0]
PKN8[3:0]
0~3
0R
RF1N[3:0]
0~2
2.5
R
RF0N[3:0]
30R
30R
V63
V62
V1
V0
V60
V57
V52
V43
V31
V20
V11
V6
V3
Step : 4R
Step : 1.5R
Step : 2R
Step : 1.5R



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