TFT-LCD Panel System Introduct...

TFT-LCD Panel System Introduction Panel System Power Solution Introduction

Frank Lin LFPD Team AE3 Division Jan. 2010

 Panel System Power Solution for TFT-LCD VCOM Buffer GPM Gate Driver Power Solution GOA

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Panel System

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TFT-LCD Power Solution
Panel Power System
Gamma & Vcom Buffer

Timing Controller

Source Driver
VGL

LDO Buck Converter Boost Converter

Charge Pump Regulator

Gate Driver
VGH

TFT-LCD Panel

GPM

Inverter WLED Driver

Back Light

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Circuit of TFT-LCD Panel
Source Driver

Gate Driver

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VCOM Buffer
Transmittance

(Source Driver) (Gate Driver) Vcom’ Vcom

RT9136

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Gamma Correction
T-V curve is non-linear.

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GPM
Prevent panel flicker phenomenon

(VCOM)

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Gate Driver Power Solution
DRVP/DRVP Ex: RT9955 Li