InnoLux Confidential
InnoLux Confidential
InnoLux Confidential
InnoLux Confidential
InnoLux Confidential
InnoLux Confidential
InnoLux Confidential
InnoLux Confidential
Q=CV, The charges do not escape!
C1 + 3.3V D2 3V3 D1
Step 4 - When contact 10V again
3.3V
C3
3V3
D1 C3 C1 + 13.3V 3.3V D2
D3
13.3V
D3
13.3V
Charge are sealed.
C2 + 13.3V D4 C4
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Saturation Line sets the min Dropout Voltage limits
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To Determine the Dropout Voltage
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3. Charge Pump
VGH, VGL
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Charge Pump
•Cost: Lowest since the circuit is compliant with the main PWM signal. •Efficiency: High •Positive Voltage: 10+10+3.3=23.3 23V •Negative Voltage: -10+0.7+0.7= -8.6 -7V
LCD
路
Prepared by
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1. Function Block
Line transfer signal RSDS signal, CLK LVDS T-con Start pulse Start pulse, Gate clock
Connector Gamma Gate IC Vcom VGH VDD5V DC Power in VGL DVDDG Gate IC
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Charge Pump 理說
--- Negative Voltage
Vout D2 1K
C1
30 D1
C2
C3
10V
Neglect these two resistor first. 4
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Charge Pump 理說
Step 1 - When contact 10V
0.7V before
C1 D1
+
C3
+
Electrons flow into, and build up potential.
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The
End
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Characteristics of N-Channel Transistor
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Characteristics of N-Channel Transistor
D4
3.3V
C4
C2
13.3V
D4
13.3V
C4
10V
13.3V may not reach so soon, but it will be.
0V
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Charge Pump 理說
--- Positive Voltage
Step 3 - When contact GND again
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2. LDO
邏
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Charge Pump 理說
--- Positive Voltage
3.3V 3V3
D1 C3
C1
3.3V
D2
D3
C2
3.3V
D4 C4
10V
(1-D)T 0V
DT
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Charge Pump 理說
Step 1 - When contact GND
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13.3V Now
C2
+ 23.3V D4
23.3V Final
C4
Contact to GND
No more 3.3V
10V
Charge are sealed.
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Charge Pump 理說
Vc
--- Positive Voltage
23V
time
Charge Pump could not provide much power. (Less than100mA, normally) To Select C1 & C2: Q = U x C1 = Iout x Duty C1= Iout x Duty / U Iout 流 Voltage
Vout
+
C1
-
0.7V
C2 D1
C3
10V
Step 2 - When contact 0V
Charges could not escape. Always keep 9.3V deviation.
Vout
D2
electrons + -
-8.6V -
-9.3V C2
Source IC
Source IC
TFT Panel
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1. DC to DC Converter 2. LDO 3. Charge Pump
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1. DC to DC Converter
Boost 路 AVDD
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3V3
--- Positive Voltage
Step 2 - When contact 10V
3.3V
3V3
Assume Vd ~ 0
D1
Q=CV, Charges could not escape!
C1 + 13.3V D2
D1
3.3V
C3
C3 C1
-
+
3.3V
D2
D3
D3
13.3V
C2
3.3V