參數(shù)資料
型號: HD66724
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): 72/117頁
文件大小: 834K
代理商: HD66724
HD66724/HD66725
72
Contrast Adjuster
Contrast for an LCD can be adjusted by varying the liquid-crystal drive voltage (potential difference
between V
LCD
and V1) through the CT bits of the contrast control instruction (electron volume function).
See figure 40 and table 37. 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 HD66724/HD66725 incorporate 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.
V
LCD
VR
R
R
R
0
R
R
-
+
-
+
-
+
-
+
-
+
GND
HD66724/5
CT
V1
V2
V3
V4
V5
GND
Figure 40 Contrast Adjuster
相關(guān)PDF資料
PDF描述
HD66725 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)
HD66726 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)
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)動器)
HD66728 112 x 80-dot Graphics LCD Controller/Driver(112 x 80點圖形LCD控制器)
HD66730 Dot-Matrix Liquid Crystal Display Controller/Driver(點陣液晶顯示控制器/驅(qū)動器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HD66724/HD66725 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
HD66724RA03TA0L 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD CONTROLLER
HD66725 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:112 x 80-dot Graphics LCD Controller/Driver
HD66725A03TA0L 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD CONTROLLER
HD66726 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions