參數(shù)資料
型號: HD66841
廠商: Hitachi,Ltd.
英文描述: LVIC-II (LCD Video Interface Controller)(LCD視頻控制器)
中文描述: LVIC - 2(液晶視頻接口控制器)(液晶顯示視頻控制器)
文件頁數(shù): 29/62頁
文件大小: 185K
代理商: HD66841
HD66841
29
Double-Height Display
The HD66841 provides double-height display which doubles the vertical size of characters and pictures
(Figure 14).
In the TN-type LCD modes (display modes 1, 2, 4, and 6–8), the CL3 signal period is half as long as the
CL1 signal period, as shown in Figure 15. Consequently, using the CL3 signal instead of the CL1 signal
(Figure 16) as a line shift clock enables two lines to be selected while X-drivers (data output drivers) are
outputting identical data, thus realizing double-height display. However, it should be noted that this display
requires the following procedure since the HD66841 displays twice as many lines as specified by pins or
internal registers:
1. Have the LCD dot clock (LDOTCK) frequency calculated from the number of vertical displayed lines
of the LCD panel.
2. Specify half the number of vertical displayed lines of the LCD panel as the number of vertical displayed
lines. (For instance, if the number of vertical displayed lines of the LCD panel is 400, specify 200 with
the YL2–YL0 pins or the vertical displayed lines register.)
This function is available only in the TN-type LCD modes; it is disabled in the TFT-type LCD modes.
Doubled-height display
Normal display
Figure 14 Doubled-Height Display Example
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