參數(shù)資料
型號: HD66726
廠商: Hitachi,Ltd.
英文描述: Graphics LCD Controller/Driver with Key Scan Function(帶鍵掃描功能的圖形LCD控制器/驅(qū)動器)
中文描述: 圖形液晶顯示控制器/鍵掃描功能(帶鍵掃描功能的圖形液晶顯示控制器/驅(qū)動器驅(qū)動程序)
文件頁數(shù): 74/117頁
文件大?。?/td> 1549K
代理商: HD66726
HD66726
74
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 (NL2-0 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 triple 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 38
Optimum Drive Bias Values
LCD drive duty
ratio
(NL2-0 set
value)
1/42 duty
ratio
(NL2-0
= 101)
1/34 duty
ratio
(NL2-0
= 100)
1/26 duty
ratio
(NL2-0
= 011)
1/18 duty
ratio
(NL2-0
= 010)
1/10 duty
ratio
(NL2-0
= 001)
1/2 duty
ratio
(NL2-0
= 000)
Optimum drive
bias value
(BS2-0 set
value)
1/7 bias
(BS2-0
= 001)
1/6 bias
(BS2-0
= 010)
1/6 bias
(BS2-0
= 010)
1/5 bias
(BS2-0
= 100)
1/4 bias
(BS2-0
= 110)
1/2 bias
(BS2-0
= 111)
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