Browse Prior Art Database

Enhanced-Spatial-Resolution Tester for Electronic Displays

IP.com Disclosure Number: IPCOM000120418D
Original Publication Date: 1991-Apr-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 1 page(s) / 49K

Publishing Venue

IBM

Related People

Feigenblatt, RI: AUTHOR

Abstract

This article discloses a machine for measuring the electro-optic characteristics of electronic displays. By modulating only spatially well- separated pixels of the display under test at any one time, the tester uses a full-field solid-state camera of modest pixel count to independently measure every pixel in the display without the need for moving parts (*) to scan the camera field over the display field.

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Enhanced-Spatial-Resolution Tester for Electronic Displays

      This article discloses a machine for measuring the
electro-optic characteristics of electronic displays.  By modulating
only spatially well- separated pixels of the display under test at
any one time, the tester uses a full-field solid-state camera of
modest pixel count to independently measure every pixel in the
display without the need for moving parts (*) to scan the camera
field over the display field.

      The tester requires that the display under study allow
independent modulation of the pixels which comprise it. This includes
raster CRT displays with linearly-excited phosphors and various
flat-panel matrix displays with limited crosstalk between rows and
columns of the matrix.

      For example, consider test of a liquid crystal matrix
flat-panel display (LCD) by a charged-coupled device (CCD) camera.
It is not necessary that the CCD be capable of optically resolving
the gap between adjacent display pixels. Instead, one determines onto
which set of CCD pixels light from each LCD pixel falls.  Light from
several LCD pixels can fall on a given CCD pixel.

      The machine measures the differential electro-optic response of
each of the display pixels to an electrical stimulus.  First, the CCD
records the image of the undriven LCD to provide a baseline scan.
Then, a subset of the LCD pixels, those whose differential electro-
optic response will be measured, are driven and the CCD rec...