LCD 驱动电路的电源设计

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LCD
路
Prepared by
InnoLux Confidential

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
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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2. LDO
邏
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Characteristics of N-Channel Transistor
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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
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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
InnoLux Confidential

Charge Pump 理說
Step 1 - When contact GND
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
D4
3.3V
C4
C2
13.3V
D4
13.3V
C4
10V
13.3V may not reach so soon, but it will be.
0V
InnoLux Confidential

Charge Pump 理說
--- Positive Voltage
Step 3 - When contact GND again
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
13.3V Now
C2
+ 23.3V D4
23.3V Final
C4
Contact to GND
No more 3.3V
10V
Charge are sealed.
InnoLux Confidential