hd66421 Renesas Electronics Corporation., hd66421 Datasheet - Page 41
hd66421
Manufacturer Part Number
hd66421
Description
Ram-provided 160 Channel 4-level Grey Scale Driver For Dot Matrix Graphics Lcd
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.HD66421.pdf
(46 pages)
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Figure 45 shows characteristics of the LCD effective value against grayscale. This value is almost
linear at all grayscale range without LCD panel. This linearity will be lost if LCD panel is
connected. In this case, the four appropriate levels must be selected from grayscale No.1 to 31.
Preliminary
2.4
2.3
2.2
2.1
2.0
0
4
Figure 45 LCD Effective Value
R14(Default)
R13(Default)
8
Grayscale No.
12
LSI (No load)
16
41
VLCD=15V, Ta=25˚C, 1/9 bias
20
LSI + LCDpanel
24
28
31
HD66421
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