參數(shù)資料
型號(hào): HD66728
廠商: Hitachi,Ltd.
英文描述: 112 x 80-dot Graphics LCD Controller/Driver(112 x 80點(diǎn)圖形LCD控制器)
中文描述: 112 × 80點(diǎn)圖形LCD控制器/驅(qū)動(dòng)器(112 × 80點(diǎn)圖形液晶顯示控制器)
文件頁(yè)數(shù): 73/138頁(yè)
文件大?。?/td> 2158K
代理商: HD66728
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HD66728
73
n-raster-row Reversed AC Drive
The HD66728 supports not only the LCD reversed AC drive in a one-frame unit (B-pattern waveform) but
also the n-raster-row reversed AC drive which alternates in an n-raster-row unit from one to 32 raster-rows
(C-pattern waveform). When a problem affecting display quality occurs, such as crosstalk at high-duty
driving of more than five lines (1/40 duty), the n-raster-row reversed AC drive (C-pattern waveform) can
improve the quality. Determine the number of raster-rows n (NW bit set value + 1) for alternating after
confirmation of the display quality with the actual LCD panel. However, if the number of AC raster-rows
is reduced, the LCD alternating frequency becomes high. Because of this, the charge or discharge current
is increased in the LCD cells.
1 2 3 4 5 6 7 8 9 10 1112 13
79 80 1 2 3 4 5 6 7 8 9 10 1112 13
79 80 1 2 3
B-pattern
waveform drive
1/80 duty
1 frame
1 frame
C-pattern
waveform drive
1/80 duty
11-raster-row
reversal
Without EORs
C-pattern
waveform drive
1/80 duty
11-raster-row
reversal
With EORs
Note: Specify the number of AC drive raster-rows and the necessity of EOR so that the DC bias is not generated for
the liquid crystal.
Figure 40 Example of an AC Signal under n-raster-row Reversed AC Drive
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