HD66421 Datasheet, PDF (41/46 Pages) Hitachi Semiconductor – (RAM-Provided 160 Channel 4-Level Grey Scale Driver for Dot Matrix Graphics LCD)

Preliminary
Rev. 1.1E '99.02.10
HD66421
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.
2.4
VLCD=15V, Ta=25˚C, 1/9 bias
2.3
LSI (No load)
2.2
R14(Default)
R13(Default)
2.1
LSI + LCDpanel
2.00
48
12 16 20 24 28 31
Grayscale No.
Figure 45 LCD Effective Value
41