參數資料
型號: HD66728
廠商: Hitachi,Ltd.
英文描述: 112 x 80-dot Graphics LCD Controller/Driver(112 x 80點圖形LCD控制器)
中文描述: 112 × 80點圖形LCD控制器/驅動器(112 × 80點圖形液晶顯示控制器)
文件頁數: 87/138頁
文件大小: 2158K
代理商: HD66728
HD66728
87
Liquid Crystal Display Drive Bias Selector
An optimum liquid crystal display bias value can be selected using BS2-0 bits, according to the liquid
crystal drive duty ratio setting (NL3-0 bits). Liquid crystal display drive duty ratio and bias value can be
displayed while switching software applications to match the LCD panel display status. The optimum bias
value calculated using the following expression is an ideal value where the optimum contrast is obtained.
Driving by using a lower value than the optimum bias value provides lower contrast and lower liquid
crystal display voltage (potential difference between V1 and GND). When the liquid crystal display
voltage is insufficient even if a five-times booster is used or output voltage is lowered because the battery
life has been reached, the display can be made easier to see by lowering the liquid crystal bias.
The liquid crystal display can be adjusted by using the contrast adjustment register (CT4-0 bits) and
selecting the booster output level (BT1/0 bits).
Optimum bias value for 1/N duty ratio drive voltage =
1
N + 1
Table 32
Optimum Drive Bias Values
LCD drive
duty ratio
1/80
1/72
1/64
1/56
1/48
1/40
1/32
1/24
1/16
1/8
(NL3-0 set
value)
1001
1000
0111
0110
0101
0100
0011
0010
0001
0000
Optimum
drive bias
value
1/10
1/9.5
1/9
1/8
1/8
1/7
1/6
1/6
1/5
1/4
(BS2-0 set
value)
000
001
010
011
011
100
101
101
110
111
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