Data Sheet

a-Si TFT LCD Single Chip Driver
240RGBx320 Resolution and 262K color
ILI9341
The information contained herein is the exclusive property of ILI Technology Corp. and shall not be distributed,
reproduced, or disclosed in whole or in part without prior written permission of ILI Technology Corp.
Page 170 of 233
8.3.10. Backlight Control 2 (B9h)
B9h Backlight Control 2
D/CX RDX WRX D17-8 D7 D6 D5 D4 D3 D2 D1 D0 HEX
Command 0 1 ↑ XX 1 0 1 1 1 0 0 1 B9h
Parameter 1 1 ↑ XX
TH_MV
[3]
TH_MV
[2]
TH_MV
[1]
TH_MV
[0]
TH_ST
[3]
TH_ST
[2]
TH_ST
[1]
TH_ST
[0]
CC
Description
TH_ST [3:0] : These bits are used to set the percentage of grayscale data accumulate histogram value in the still picture
mode. This ratio of maximum number of pixels that makes display image white (=data “255”) to the total of pixels
by image processing.
TH_ST [3:0] Description TH_ST [3:0] Description
4’0h 99% 4’8h 84%
4’1h 98% 4’9h 82%
4’2h 96% 4’Ah 80%
4’3h 94% 4’Bh 78%
4’4h 92% 4’Ch 76%
4’5h 90% 4’Dh 74%
4’6h 88% 4’Eh 72%
4’7h 86% 4’Fh 70%
TH_MV [3:0] : These bits are used to set the percentage of grayscale data accumulate histogram value in the moving image
mode. This ratio of maximum number of pixels that makes display image white (=data “255”) to the total of pixels
by image processing.
TH_MV [3:0] Description TH_MV [3:0] Description
4’0h 99% 4’8h 84%
4’1h 98% 4’9h 82%
4’2h 96% 4’Ah 80%
4’3h 94% 4’Bh 78%
4’4h 92% 4’Ch 76%
4’5h 90% 4’Dh 74%
4’6h 88% 4’Eh 72%
4’7h 86% 4’Fh 70%
100%
Histogram
TH_MV[3:0]
TH_ST[3:0]
TH_UI[3:0]
Dth 255
Gray Scales