參數(shù)資料
型號(hào): 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(dòng)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(dòng)器驅(qū)動(dòng)程序)
文件頁數(shù): 71/117頁
文件大小: 1549K
代理商: HD66726
HD66726
71
Contrast Adjuster
Software can adjust contrast for an LCD by varying the liquid-crystal drive voltage (potential difference
between V
LCD
and V1) through the CT bits of the contrast adjustment register (electron volume function).
The value of a variable resistor (VR) can be adjusted within a range from 0.1 x R through 3.2 x R, where R
is a reference resistance obtained by dividing the total resistance between V
LCD
and V1.
The HD66726 incorporates a voltage-follower operational amplifier for each of V1 to V5 to reduce current
flowing through the internal bleeder resistors, which generate different liquid-crystal drive voltages. Thus,
CT4-0 bits must be adjusted so that the potential differences between V
LCD
and V1 and between V5 and
GND are 0.1 V or higher when liquid-crystal drives.
VLCD
VR
R
R
R0
R
R
GND
HD66726
CT
V1
V2
V3
V4
V5
GND
-
+
-
+
-
+
-
+
-
+
Figure 42 Contrast Adjuster
相關(guān)PDF資料
PDF描述
HD66727 Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function(帶鍵掃描功能的圖形LCD控制器/驅(qū)動(dòng)器)
HD66728 112 x 80-dot Graphics LCD Controller/Driver(112 x 80點(diǎn)圖形LCD控制器)
HD66730 Dot-Matrix Liquid Crystal Display Controller/Driver(點(diǎn)陣液晶顯示控制器/驅(qū)動(dòng)器)
HD66731 Dot-Matrix Liquid Crystal Display Controller/Driver(點(diǎn)陣液晶顯示控制器/驅(qū)動(dòng)器)
HD66731A00TB0L 122 x 32 pixel format, Compact LCD size
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