參數(shù)資料
型號: HD667B66R
廠商: Hitachi,Ltd.
英文描述: 132 x 176-dot Graphics LCD Controller/Driver for 65K Colors
中文描述: 132 × 176點(diǎn)圖形LCD控制器/驅(qū)動(dòng)器的65K色
文件頁數(shù): 72/97頁
文件大小: 681K
代理商: HD667B66R
HD66766R Rev. 1.0-1 / September 2002
72
LCD Voltage Generation Circuit
Figure 58 shows a configuration of the HD66766R LCD drive voltage generation circuit. It consists of
step-up circuit 1 that doubles or triples the voltage that is applied to Vci1, step-up circuit 2 that multiplies
the voltage from step-up circuit 1 by two to five times, and polarity circuit that generates a VCL level by
inverting the VCH level centered around the VM level. These circuits generate VCH and VCL that are
power supply for COM outputs. The LCD driving level for SEG outputs (VSH and VM) are generated by
dividing resistance at the VREF level.
Figure 55 Configuration of internal power circuit
HD66766R
-
+
-
+
VSH
VCL
VM
CEM
CEP
C21-
C21+
C22-
C22+
C23-
C23+
VCH
-
+
-
+
C11+
C12-
C12+
C11-
Vci1
VOUT
VciOUT
-
+
1.0
μ
F
1.0
μ
F
1.0
μ
F
1.0
μ
F
1.0
μ
F
1.0
μ
F
1.0
μ
F
1.0
μ
F
1.0
μ
F
0.47uF
C24-
C24+
1.0
μ
F
1.0
μ
F
Vcc
VREFL
VREF Control
Amplifier
bias
amplifier
bias control
BIASC
Vci2
VCH
Generator
Step - up
circuits 2
VREFM
Vcc
Vci Control
Circuits
VOUT
generator
Step - up
circuits 1
Contrast
control
SEG driver
1.0
μ
F
1.0
μ
F
Vcc
GND
AGND
VCL
generator
Polarity
inverting
circuit
COM driver
Shot-key
barrier diode
Note: 1) Use condenser with character B.
2) Condensers with asterisk (*) need resist
pressure more than 25V.
3) Insert shot-key barrier diode.
(VF = 0.6V / 20mA, VR>=30V)
1.0M
AVcc
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