Title:
Engineering Specification: 12.1-inch AMLCD Monitor
Page
4 of 27
Document Number
: 023-0284-00
Revision:
A
1.0
INTRODUCTION
This document defines the electromechanical parameters and operating characteristics for a 12’1” Active
Matrix Liquid Crystal Display (AMLCD) based product, hereafter referred to as the Monitor. It is intended for
operation in high ambient light, outdoor environment. The Monitor has a scaleable video format capable of
displaying a minimum of VGA (640 x 480) through XGA (1024 x 768) input resolution.
The Monitor can be driven directly from the standard analog Video Graphics Array (VGA) output on a
personal computer (PC). It consists of a 12.1" viewable diagonal LCD Panel with optical elements, Cold-
Cathode Fluorescent Backlight, Backlight Inverter Board, and LCD Controller Board. Cooling fans provide
temperature stabilization within the Monitor’s operating environment. Two (2) chassis mounted connectors at
the rear provide for video signal and DC power input connections. These components will be mounted in a
fully enclosed chassis.
1.1 Display Format
The Monitor is compatible with IBM VGA
1
and VESA
2
video standards. Its operating frequency
range is 31.5 KHz
&
56.5 KHz horizontal; 60 Hz
&
72 Hz (non-interlaced) vertical. Specific video
resolutions supported are as follows:
For IBM VGA
1
modes, the Monitor will accept 640 pixels horizontally; 400 or 480 lines vertically and
800 pixels or 1024 pixels horizontally, 600 lines or 768 lines vertically for the VESA
2
modes. Figure
9 defines the video signal timing requirements.
The LCD Controller Board will automatically program itself, sensing incoming horizontal/vertical
frequencies and sync pulse polarities to completely “fill” the active display area of the Monitor with
the video resolution being presented. Section 4.4.1 (Video Mode Definitions) defines parameters for
video resolution detection by the LCD Controller Board.
Note: IBM VGA
1
modes with border and the 720 x 400 video resolution are excluded from
completely filling the active display area horizontally. Only the first 640 pixels will be displayed.
1
IBM VGA is a registered trademark of International Business Machines Corporation
2
VESA is a registered trademark of Video Electronics Standards Association.
Video Resolution
Number of Bits/Color
Number of Colors
640 x 400
6
262,144
640 x 480
6
262,144
720 x 400
6
262,144
800 x 600
6
262,144
1024 x 768
6
262,144
