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參數(shù)資料
| 型號： | HD66134ST |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 240-Channel Segment Driver for a Dot-Matrix STN Liquid Crystal Display with Low-Voltage Drive(點陣STN LCD低壓段碼驅(qū)動器) |
| 中文描述： | 240通道段為驅(qū)動點矩陣STN液晶顯示器用低電壓驅(qū)動器（點陣STN液晶顯示器低壓段碼驅(qū)動器） |
| 文件頁數(shù)： | 9/24頁 |
| 文件大小： | 115K |
| 代理商： | HD66134ST |
HD66134ST
9
Correction Circuit
The HD66134STs include shadowing correction circuits. There are two types of shadowing: one caused by
crosstalk, and the other by waveform distortion. In both types, image quality can be improved by
correction circuits CC1, CC2, CC3, and CC4.
(1) CC1 and CC2 (shadowing caused by crosstalk)
M
White
Black
Black
Black
Black
White
White
White
White
White
Waveform at (a)
Waveform at (b)
Shadowing section
(Normally black panel)
SEG
COM
SEG
COM
(a)
(b)
Corresponding
sections
Figure 7 CC1 and CC2
When a ruled line is displayed, noise occurs in the common VM level in the LCD panel due to the segment
change of a solid background in M reverse. This is because many segments display the solid background
and are simultaneously changed, affecting the common VM level (creating crosstalk). The effective
voltage for section (a) in the solid background becomes low. On the other hand, the effective voltage for
section (b) becomes high. Shadowing occurs in the corresponding sections due to the different voltages.
The HD66134STs compare the crosstalk correction signals CC1 and CC2 and the present output, and
determine whether the effective value is increased by the crosstalk. If increased, the output level is reset to
the VM, which corrects the effective voltages in (a) and (b) and suppresses the shadowing. Figure 8 shows
an example of the crosstalk-correction-signal external circuit. The basic potentials of a comparator (VM +
V and VM –
V’) are corrected according to the shadowing level for output correction while CC1 and
CC2 are high. CC1 corrects the rising crosstalk, and CC2 corrects the falling crosstalk.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HD66135T | 120-Channel High-Voltage Common Driver for a Dot-Matrix STN Liquid Crystal Display(點陣STN LCD的高電壓120通道驅(qū)動器) |
| HD66136T | 400-Channel Segment Driver for a Dot-Matrix STN Liquid Crystal Display with Low-Voltage Drive(點陣STN LCD低壓段碼驅(qū)動器) |
| HD66137T | High-Voltage Durable 240-Channel Common Driver for Dot-Matrix STN LCD(點陣STN LCD的高電壓耐用240通道驅(qū)動器) |
| HD66137 | High-Voltage Durable 240-Channel Common Driver for Dot-Matrix STN LCD |
| HD66204 | DOT MATRIX LIQUID CRYSTAL GRAPHIC DISPLAY COLUMN DRIVER WITH 80-CHANNEL OUPUTS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD66135T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver |
| HD66137 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:High-Voltage Durable 240-Channel Common Driver for Dot-Matrix STN LCD |
| HD66137T | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:High-Voltage Durable 240-Channel Common Driver for Dot-Matrix STN LCD |
| HD66204 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:DOT MATRIX LIQUID CRYSTAL GRAPHIC DISPLAY COLUMN DRIVER WITH 80-CHANNEL OUPUTS |
| HD66204F | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:DOT MATRIX LIQUID CRYSTAL GRAPHIC DISPLAY COLUMN DRIVER WITH 80-CHANNEL OUPUTS |
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