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4. Circuit Description
1. LCD Integrated Power System (LIPS)
The LCD Integrated Power System (LIPS) is a power module combined adaptor and CCFL inverter. It accepts
100~240Vac and supply 12Vdc and 5Vdc to main board and TFT-LCD panel. About CCFL dimming and on/off
function is controlled by micro-controller.
2. Scaler
The TSUM57AK is total solution graphics processing IC for LCD monitors with panel resolutions up to SXGA. It is
configured with a high-speed integrated triple-ADC/PLL, an integrated DVI receiver, a high quality display processing
engine, and an integrated output display interface that can support RSDS panel interface format. To further reduce
system costs, the TSUM57AK also integrates intelligent power management control capability for green-mode
requirements and spread- spectrum support for EMI management.
The TSUM57AK incorporates the world's first coherent oversampled RGB graphics ADC in a monitor controller
system. The oversampling ADC samples the input RGB signals at a frequency that is much higher than the signal
source pixel rate. This can preserve details in the video signal that ordinarily would be lost due to input signal jitter or
bandwidth limitations in non-oversampled systems. The TSUM57AK also incorporates a new Dynamic Frame Rate
(DFR) generator for the digital output video to the display panel that preserves the advantages of a fixed output clock
rate, while eliminating the output end of frame short-line.
Block Diagram
ViewSonic Corporation
Confidential - Do Not Copy
15
VA1912w-1
VA1912wb-1
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