Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Objective Manufacturing Tester of LCD Panels

IP.com Disclosure Number: IPCOM000107353D
Original Publication Date: 1992-Feb-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Related People

Miller, I: AUTHOR [+4]

Abstract

Disclosed is a production tool for fast testing and verification of liquid crystal display (LCD) panels/sub-assemblies at selected points on the panel area. Control is automatic by means of a personal computer (PC) using programmed test sequences with their results compared to stored tolerance parameters. Benefits are by increased manufacturing throughput compared with human vision methods. Also fast changeover between different types of LCD fed from a single production line is possible.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 76% of the total text.

Objective Manufacturing Tester of LCD Panels

       Disclosed is a production tool for fast testing and
verification of liquid crystal display (LCD) panels/sub-assemblies at
selected points on the panel area. Control is automatic by means of a
personal computer (PC) using programmed test sequences with their
results compared to stored tolerance parameters.  Benefits are by
increased manufacturing throughput compared with human vision
methods. Also fast changeover between different types of LCD fed from
a single production line is possible.

      Figs. 1 (section) and 2 (plan) show diagramatically an
embodiment employing four photo diode sensors for a simple
rectangular LCD array.  More than four may be employed and in any
positions to suit the size and geometry of the LCD under test.

      The tester comprises a frame 1 raised above a jig 2 by supports
5 secured to base plate 3.  Jig 2 accepts LCD panels 4 to be tested
which are mechanically referenced by features such as edges and
bezel.  The frame 1 carries a light meter probe 6, nominally above
the center of the LCD, and four photo diodes P1-P4 spaced at defined
height positions and angles by supports 5.  Light meter probe 6 is
connected to a light meter 7 which communicates with the test system
PC in Fig. 2.  Photo diodes P1-P4, corrected for photopic response,
are connected via amplifiers 8 to a multi-channel analog-digital
conversion card 9 in the PC. The patterns displayed on the LCD panel
4 are...