Browse Prior Art Database

Gamma Correction Control

IP.com Disclosure Number: IPCOM000104729D
Original Publication Date: 1993-May-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Naitoh, A: AUTHOR [+3]

Abstract

This articles describes Gamma Correction Control which is applied to gray scale on Liquid Crystal Display (LCD). Gamma Correction Control is to adjust the value of gamma correction, keeping both the least luminous level and the most luminous level.

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Gamma Correction Control

      This articles describes Gamma Correction Control which is
applied to gray scale on Liquid Crystal Display (LCD).  Gamma
Correction Control is to adjust the value of gamma correction,
keeping both the least luminous level and the most luminous level.

      The figure shows the example of Gamma Correction Control.  In
this case, the LCD has a gray scale consisting of 8 addressable
levels.  The code points for these levels are numbered i=0,1,...,7.
i=0 is the least luminous level; i=7 is the most luminous level.
Changing the luminous levels of i=1 thru i=6 properly gets the same
effect as changing the gamma correction.

      The optimum gamma correction varies with the application such
as Text, Windows, Graphics, Image, etc.  With this feature, LCD user
can adjust and select the most preferable gamma correction easily.

      Gamma correction is controlled by the volume which is provided
with LCD, like brightness control volume.  Gamma Correction Control
is not limited the LCD, but CRT, Plasma, or other display devices are
also applicable.