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Backlight Life Saving by Optimized Timer Setting Method

IP.com Disclosure Number: IPCOM000114150D
Original Publication Date: 1994-Nov-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Okudaria, K: AUTHOR [+2]

Abstract

This article describes the algorithm to maximize the backlight life of Liquid Crystal Display (LCD) by optimized timer setting method. The backlight of LCD is a fluorescent light, of which product life depends on the total power on hour and also the total number of turn on/off cycle. Therefore, the point to maximize the backlight life is not just turn off the light as often as possible when not in use, but to adjust the timer to turn off the light.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Backlight Life Saving by Optimized Timer Setting Method

      This article describes the algorithm to maximize the backlight
life of Liquid Crystal Display (LCD) by optimized timer setting
method.  The backlight of LCD is a fluorescent light, of which
product life depends on the total power on hour and also the total
number of turn on/off cycle.  Therefore, the point to maximize the
backlight life is not just turn off the light as often as possible
when not in use, but to adjust the timer to turn off the light.

      In case of the backlight which we planned to use, the
specification shows the total power on hour is 10 thousand hours,
with a limitation of 20 thousands turn on/off cycles.  The following
algorithm shows how the timer for turn off the backlight when not in
use can be automatically set.

      First, the parameter X is the accumulated power on hour of the
backlight, and the parameter Y is the accumulated number of turn
on/off cycle, which should be traced by the system.  Next, the system
should monitor the user's access and trace the interval of the system
is not in use, and then, add into the following table if the interval
is over 5 minutes.
  +-----------------------------------------------------------------+
  |Time of Interval   | 5-10 | 10-15 | 15-20 | 20-25 | .....|60-    |
  | (minutes)         |      |       |       |       |      |       |
  +-------------------+------+-------+-------+-------+------+-------+
  |Number             |  N1  |  N2   |  N3   |   N4  |      | Nm    |
  +---------------------------------------------...