參數(shù)資料
型號(hào)： HD66740TB0
廠商： Hitachi,Ltd.
英文描述： 50/MDR/RECP/VERT PRS FIT/M2.6/SCW/30MIN
中文描述： 112 × 80點(diǎn)圖形LCD控制器/驅(qū)動(dòng)器
文件頁數(shù)： 49/95頁
文件大?。?/td> 856K
代理商： HD66740TB0
HD66740
49
Countermeasures for Screen Quality when Using On-chip Operational Amplifier
The HD66740 is an on-chip LCD driver that has an LCD power supply for high duty. Screen quality is
affected by the load current of the high-duty LCD panel used. When the bias (1/10 bias, 1/9.5 bias, 1/9
bias, etc.) is high and the displayed pattern is completely or almost completely white, the white sections
may appear dark.
If this happens, execute the following countermeasures to improve screen quality.
(1) After the change in the V4OUT/V3OUT level is verified, insert about 1 M
between V4OUT and
GND or VLCD and V3OUT and then adjust the screen quality (see the following figures). By
inserting resistance, the current consumption increases as much as the boosting factor of the
resistance current. Adjust the resistance after checking the screen quality and the increase in current
consumption.
(2) Decrease the drive bias and use the new bias level after verifying that the potential differences
between V4OUT and GND or VLCD and V3OUT are sufficient.
GND
VLCD
Driver
Vbn
Fixed
current
source
RV4
C
V4OUT
Figure 24-b Countermeasure for V4OUT Output
GND
VLCD
Driver
Vbp
Fixed
current
source
RV3
C
V3OUT
Figure 24-c Countermeasure for V3OUT Output
Note:
The actual LCD drive voltage-VLCD used must not exceed 15.0 V, and the absolute rating must
not exceed 16.0 V.
相關(guān)PDF資料
PDF描述
HD66740WTB0 112 x 80-dot Graphics LCD Controller/Driver
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
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HD66740WTB0 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:112 x 80-dot Graphics LCD Controller/Driver
HD66741 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
HD66750 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
HD66750TB0 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
HD66751 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
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