參數(shù)資料
型號: HD66732
廠商: Hitachi,Ltd.
英文描述: Graphics Liquid Crystal Display Controller/Driver Supporting JIS Level-1 and Level-2 Kanji ROM(圖形LCD控制器/驅(qū)動(dòng)器)
中文描述: 圖形液晶顯示控制器/驅(qū)動(dòng)器支持日標(biāo)級- 1和第2級漢字光盤(圖形液晶顯示控制器/驅(qū)動(dòng)器)
文件頁數(shù): 111/133頁
文件大?。?/td> 2608K
代理商: HD66732
HD66732
111
Partial-display-on Function
The HD66732 can program the liquid crystal display drive duty ratio setting (NL2-0 bits), liquid crystal
display drive bias value selection (BS2-0 bits), boost output level selection (BT1/0 bit) and contrast
adjustment (CT4-0 bits). For example, in the four-line display mode (1/54 duty ratio), the HD66732 can
drive only two lines in the center of the screen by combining these register functions and the centering
display (CEN bit) function with the 1/28 duty ratio. This is called partial-display-on. Lowering the liquid
crystal display drive duty ratio as required saves the liquid crystal display drive voltage, thus reducing
internal current consumption. This is suitable for calendar or time display, which needs to be continuous in
the system standby state with minimal current consumption. Here, the non-displayed lines are constantly
driven by the unselected level voltage, thus turning off the LCD for the lines.
In general, lowering the liquid crystal display drive duty ratio decreases the optimum liquid crystal display
drive voltage and liquid crystal display drive bias value.
Table 59 Partial-display-on Function (4-line Display)
Item
Normal 4-line Display
Partial-on Display
Character/graphics
display
4th line displayed
Only one line in the
center of the screen
Only two lines in the
center of the screen
LCD drive duty ratio
1/54 (NL2/1/0 = 100)
1/15 (NL2/1/0 = 001)
1/28 (NL2/1/0 = 010)
LCD drive bias
value (optimum)
1/8 (BS2-0 = 000)
1/5 (BS2-0 = 100)
1/6 (BS2-0 = 010)
LCD drive voltage
Adjustable using BT1/0
and CT4-0
Adjustable using BT1/0
and CT4-0
Adjustable using BT1/0
and CT4-0
Frame frequency
(fosc = 76 kHz)
70 Hz
71 Hz
70 Hz
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