– 17 –

LCX021AM

2. LCD panel operations

[Description of basic operations]

• A vertical driver, which consists of vertical shift registers, enable-gates and buffers, applies a selected pulse

to every 604 gate lines sequentially in a single horizontal scanning period (in SVGA mode).

• A horizontal driver, which consists of horizontal shift registers, gates and CMOS sample-and-hold circuits,

applies selected pulses to every 804

× 3 signal electrodes sequentially in a single horizontal scanning period.

These pulses are used to supply the sampled video signal to the row signal lines.

• Vertical and horizontal shift registers address one pixel, and then turn on Thin Film Transistors (TFTs; two

TFTs) to apply a video signal to the dot. The same procedures lead to the entire 604

× 804 × 3 dots to

display a picture in a single vertical scanning period.

• The data and video signals shall be input with the 1H-inverted system.

[Description of operating mode]

This LCD panel can change the active area by displaying a black frame to support various computer or video

signals. The active area is switched by MODE. However, the center of the screen is not changed. The active

area setting modes are shown below.

MODE

Display mode

H

SVGA

804

× 3 × 604

PC98

804

× 3 × 500

L

This LCD panel has the following functions to easily apply to various uses, as well as various broadcasting

systems.

• Right/left inverse mode

• Up/down inverse mode

These modes are controlled by two signals (RGT and DWN). The right/left and/or up/down setting modes are

shown below:

Right/left and/or up/down mean the direction when the Pin 1 marking is located at the right side with the pin

block upside.

To locate the active area in the center of the panel in each mode, polarity of the start pulse and clock phase for

both the H and V systems must be varied. The phase relationship between the start pulse and the clock for

each mode is shown on the following pages.

RGT

Mode

Right scan

Left scan

H

L

DWN

Mode

Down scan

Up scan

H

L