Portable terminal device
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United States of America Patent
Stats
-
May 7, 2002
Grant Date -
N/A
app pub date -
Jan 15, 1999
filing date -
Jan 19, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A portable terminal device including display means 40 for indicating characters and figures, light-emitting means 31 and 32 for emitting exposing light to be used as backlight of the display means, drive means 21 and 22 for activating the light-emitting means, and control means 11 for controlling the drive means, wherein the light-emitting means emits exposed light rays having at least two wavelengths; the control means controls the drive means according to the content of the information to be transmitted to the user in such a way that the wavelength of the exposing light originating from the light-emitting means are changed, thereby enabling the color of backlight of the display means to be changed according to the content of the information to be transmitted. Since a user can ascertain information by means of backlight color, operations required to read characters and figures indicated on the display means can be simplified. This function produces a great effect particularly in darkness.
First Claim
Family
International Classification(s)
Cited Art Landscape
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