Philips TPM4.1E Service Manual page 23

7.3 T-CON Architecture
Refer to figure Figure 7-4
platform.
LVDS from
Scaler chip
Panel Vcc
7.3.1 T-CON Unit
The T-CON section includes the T-CON IC, a Level shift IC, a
DC to DC conversion IC and a correction Gamma IC. The
T-CON IC will transform the LVDS signal into a mini-LVDS
signal with a 6 pairs Level shifter IC. This is a 9 channel
level-shifter intended for use in LCD display applications such
as TVs and monitors. The device converts the logic-level
signals generated by the Timing Controller (T-CON) to the
high-level signals used by the display panel. The gamma IC
outputs eight voltage references for gamma correction in TFT
LCDs and one voltage reference for VCOM. Each gamma
reference voltage has its own 10-bit digital-to-analog converter
(DAC) and buffer to ensure a stable voltage. The VCOM
reference voltage has its own 10-bit DAC and an amplifier to
ensure a stable voltage when critical levels and patterns are
displayed. The DC to DC IC multiple-output power-supply
controller generates all the supply rails for thin-film transistor
(TFT) liquid-crystal display (LCD) panels in TVs and monitors
operating from a regulated 12 V input. It includes a step-down
and a step-up regulator, a positive and a negative charge
pump, a dual-mode logic controlled high-voltage switch control
block, and an adjustable timing power-good output. The
positive and negative charge-pump regulators provide the TFT
gate driver supply voltages.
for the power architecture of this
EEPROM
24C32
Mini LVDS
T-con chip
TL2428MC
GCLK
DC to DC (HVDD)
DC to DC (VGH/VDD/VCC/VGL)
Figure 7-4 T-CON Architecture TPM4.1E platform
Circuit Descriptions
Gamma
P-Gamma/V -
com
V-com buffer
Level shifter
TPM4.1E LA 7.
Panel Module
18870_404_100211.eps
EN 23
100308
2010-Jun-18