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參數(shù)資料
| 型號(hào)： | HD66740WTB0 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 112 x 80-dot Graphics LCD Controller/Driver |
| 中文描述： | 112 × 80點(diǎn)圖形LCD控制器/驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 52/95頁(yè) |
| 文件大?。?/td> | 856K |
| 代理商： | HD66740WTB0 |
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HD66740
52
Contrast Adjuster
Software can adjust 64-step 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 between V
LCD
and V1 (VR) can be precisely adjusted in a 0.05
x R unit within a range from 0.05 x R through 3.20 x R, where R is a reference resistance obtained by
dividing the total resistance.
The HD66740 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, CT5-0 bits must be adjusted so that the potential differences between V
LCD
and V1 and
between V5 and GND are 0.4 V or higher when liquid-crystal drives, particularly when the VR is
small.
VR
R
R
R0
R
R
GND
VLCD
-
-
-
-
-
HD66740
CT
V1
V2
V3
V4
V5
GND
Figure 27 Contrast Adjuster
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HD66751 | 128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions |
| HD66750TB0 | 122 x 32 pixel format, Compact LCD size |
| HD66750 | 128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions |
| HD66751TB0 | 128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions |
| HD66760 | 104 X 80-dot Graphics LCD Controller/Driver for 256 Colors |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD66741 | 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions |
| HD66750 | 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions |
| HD66750TB0 | 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions |
| HD66751 | 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions |
| HD66751S | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述: |
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