52SX4D_Training_Manual.pdf

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TRAINING MANUAL
DLP P
ROJECTION
TV
52SX4D
Digital Display
Copyright 2006 LG Electronics Alabama Inc.
DLP Training
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Table of Contents
Section I – General Information
Introduction
Connections
TV Guide Setup
Menu Operation
Setup Menu
Video Menu
Audio Menu
Time Menu
Option Menu
Lock Menu
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10
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13
15
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Section II – Technical Information
DLP Components
CableCARD™
Lamp Status
Block Diagram
Disassembly
Interconnect
Troubleshooting
Service Menus
IN-START
ADJUST
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22
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25
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32
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INTRODUCTION
What is DMD
DMD is the acronym for Digital Micro-mirror Device
- A DMD mirror is controlled by loading data into the memory cell(CMOS SRAM) below the mirror. The data electrostatically controls
the mirror’s tilt angle in a binary fashion.
- Each mirror is independently controllable and modulates reflected light, mapping a pixel of video data to a pixel on display.
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The video signal is received by the chip and is separated into its red, green, and blue components.
For each color component, its intensity is translated to a value between 0 and 255 and stored in the mirror control byte.
Using the reset/latch bias currents, all mirrors in the array are returned to their
neutral position. Then the most
significant bit is sent to the mirror memory cell and the latch current is turned on. If the bit was a ‘one’ the mirror deflects
towards the projection lens and is latched; if ‘zero’ the mirror deflects to - 12 degrees and no light is sent to the lens.
While the mirrors are latched in place, the next bit in the intensity byte is sent to each mirror’s memory cell. Once in the
cell, the reset/latch bias currents return the mirror to the neutral position and then either to ± 12 degrees , depending once
again upon the contents of the memory cell.
This process continues until all the bits in the intensity byte have been transmitted to the memory cell and the mirror
moved in response. It should be noted that the total
time that a mirror is “on” depends on which bit is being processed;
the most significant bit stays “on” the longest while the least significant bit is the shortest.
Thus, to process a single frame of video each mirror will move 8 times; for maximum intensity, all 8 times will result in a
positive deflection, while minimum intensity results in 8 negative deflections. Intermediate intensities require that the mirror
move in both directions at a ration equal to the desired intensity.
The net effect is that for each pixel, anywhere from 0 to 255 flashes of a specific color will be reflected to the projection
lens. Because the cycle time is so much faster than the integration time of the human brain and eye, the multiple flashes
are perceived as intensity.
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