Portable terminal device

• US 6,385,466 B1
• Filed: 01/15/1999
• Issued: 05/07/2002
• Est. Priority Date: 01/19/1998
• Status: Expired due to Fees

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Yanagida, Masayuki, Hirai, Koutarou
• Primary Examiner(s): Hunter, Daniel
• Assistant Examiner(s): TRAN, PABLO N
• Application Number:
  US09/232,497
• Time in Patent Office: 1,208 Days
• Field of Search: 455/566, 455/344, 455/421, 455/158.4, 455/564, 455/158.5, 455/159.1, 455/159.2, 455/90, 455/550, 455/575, 455/572, 455/127, 455/343, 455/573, 455/123, 455/158.2, 455/38.4, 455/157.2, 345/156, 345/155, 345/150, 374/573, 374/825.44
• US Class Current: 455/566
• CPC Class Codes: G09G 2320/062 Adjustment of illumination source parameters
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: H04M 1/22 Illumination; Arrangements for improving the visibility of characters on dials
• CPC Class Codes: H04M 1/576 associated with a pictorial or graphical representation
• CPC Class Codes: H04M 1/72516 with means for out-of-range alerting
• CPC Class Codes: H04M 19/04 the ringing-current being generated at the substations
• CPC Class Codes: H04M 19/048 Arrangements providing optical indication of the incoming call, e.g. flasher circuits

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.

Claims

1. A portable terminal device comprising:

display means for indicating characters and figures;

light-emitting means for emitting exposing light to be used as backlight of said display means;

drive means for activating said light-emitting means; and

control means for controlling said drive means, wherein

said light-emitting means emits exposed light rays having at least two wavelengths,

said control means controls said drive means according to the content of the information to be transmitted to a user so as to change the wavelength of the exposing light originating from said light-emitting means;

detection means for detecting the voltage level of a drive battery of said portable terminal device; and

setting means for setting a threshold value for the voltage level of said battery, wherein

when the voltage level detected by said detection means reaches the threshold value, said control means controls said drive means so as to switch the wavelength of the light originating from said light-emitting means.

2. A portable terminal device comprising:

display means for indicating characters and figures;

light-emitting means for emitting exposing light to be used as backlight of said display means;

drive means for activating said light-emitting means; and

control means for controlling said drive means, wherein

said light-emitting means emits exposed light rays having at least two wavelengths, and

said control means controls said drive means according to the content of the information to be transmitted to a user so as to change the wavelength of the exposing light originating from said light-emitting means,

reading means for reading from a received signal the phone number of the calling party;

storage means for storing at least one phone number; and

comparison means for comparing the phone number of the calling party read by said reading means with the phone numbers stored in said storage means, wherein on the basis of the result of the comparison performed by said comparison means, said control means controls said drive means so as to switch the wavelength of the light originating from said light-emitting means.

3. A portable terminal device comprising:

display means for indicating characters and figures;

light-emitting means for emitting exposing light to be used as backlight of said display means;

drive means for activating said light-emitting means; and

control means for controlling said drive means, wherein

said light-emitting means emits exposed light rays having at least two different

wavelengths, said control means controls said drive means according to the content of the information to be transmitted to a user so as to change the wavelength of the exposing light originating from said light-emitting means;

measurement means for measuring the electric field level of a received signal; and

setting means for setting a threshold value for the electric field, wherein

when the electric filed level measured by said measurement means reaches the threshold value, said control means controls said drive means so as to switch the wavelength of the light originating from said light-emitting means.