LCD system with integrated annunciator

• US 5,603,104 A
• Filed: 03/21/1995
• Issued: 02/11/1997
• Est. Priority Date: 03/19/1993
• Status: Expired due to Fees

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Phelps, William C. III, Gonzalez, Armando, Daggs, Dwayne A., Tokiyama, Masaru
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): VO, NGUYEN THANH
• Application Number:
  US08/518,475
• Time in Patent Office: 693 Days
• Field of Search: 455/89, 455/90, 455/150.4, 455/159.1, 455/159.2, 455/226.4, 455/157.2, 455/154.1, 345/38-40, 345/50, 345/87-88, 340/286.11, 340/815.43, 340/815.45, 340/815.56, 340/815.65, 340/815.66, 340/815.67, 362/27, 362/29
• US Class Current: 455/90.3
• CPC Class Codes: G08B 5/225 Display details

Abstract

A display system (100) includes a liquid crystal display (140) which incorporates annunciator areas (142). Each annunciator area (142) has an aperture (146,147,148), independently controlled, to allow the passage of light through the annunciator area (142). Independently controlled illumination (160,210,212,214) is positioned behind each annunciator area (142). The passage of light through each annunciator area (142) is controlled by opening and closing the aperture (146,147,148).

Claims

1. A liquid crystal display system responsive to a plurality of control signals, comprising:

a liquid crystal display including a negative image display annunciator area having a controllable aperture that prevents light from passing through said annunciator area when the controllable aperture is closed, said aperture being responsive to a control signal selected from said plurality of control signals to selectively open and close said aperture; and

an illuminator positioned behind the annunciator area, the illuminator being responsive to a control signal selected from said plurality of control signals for turning the illuminator on and off;

wherein the control signal for the controllable aperture is synchronized with the control signal for the illuminator to turn the illuminator on and off when the controllable aperture is opened and closed respectively, such that there is no illumination behind the annunciator area when the controllable aperture is closed.

2. A liquid crystal display system as defined in claim 1, wherein said illuminator comprises a colored light source positioned behind said annunciator area.

3. A liquid crystal display system as defined in claim 2, wherein said colored light source comprises a light emitting diode.

4. A liquid crystal display system as defined in claim 2, further comprising:

a color reflector interposed between said annunciator area and said colored light source; and

said color reflector is independently colored for said annunciator area, said color reflector matching the color of said colored light source for said annunciator area.

5. A radio, comprising:

communication means for communicating messages over a radio frequency channel, and for providing a plurality of control signals;

a liquid crystal display including a negative image display annunciator area having a controllable aperture that prevents light from passing through said annunciator area when the controllable aperture is closed, said aperture being responsive to a control signal selected from said plurality of control signals to selectively open and close said aperture; and

an illuminator positioned behind the annunciator area, the illuminator being responsive to a control signal selected from said plurality of control signsls for turning the illuminator on and off;

wherein the control signal for the controllable aperture is synchronized with the control signal for the illuminator to turn on and off the illuminator when the controllable aperture is opened and closed respectively, such that there is no illumination behind the annunciator area when the controllable aperture is closed.

6. A liquid crystal display system responsive to a plurality of control signals, comprising:

a liquid crystal display comprising a negative image display portion, the negative display portion including a plurality of controllable apertures for controlling passage of light through said negative image display portion, said apertures being responsive to a first set of control signals selected from said plurality of control signals for selectively opening and closing each of said apertures, wherein the plurality of controllable apertures, when collectively closed, prevents the passage of light through the negative image display portion; and

a plurality of light sources corresponding to the plurality of apertures, each light source being positioned behind, so as to independently light, one of said plurality of apertures, the plurality of light sources being responsive to a second set of control signals selected from said plurality of control signals to independently turn each light source on and off;

wherein said first set of control signals and said second set of control signals are synchronized to turn on and off each light source when the corresponding aperture is opened and dosed respectively, such that there is no illumination behind the corresponding aperture when closed.

7. A radio, comprising:

communication means for communicating messages over a radio frequency channel, and for providing a plurality of control signals;

a liquid crystal display comprising a negat/ve image display portion including a plurality of annunciator areas, each annunciator area having a controllable aperture for selectively preventing passage of light therethrough, said apertures being responsive to a first set of control signals selected from said plurality of control signals for selectively opening and closing each of said apertures, wherein the plurality of controllable apertures, when collectively closed, prevents the passage of light through the negative image display portion; and

a plurality of light sources corresponding to the plurality of apertures, each light source being positioned behind, so as to independently light, one of said plurality of annunciator areas, the plurality of light sources being responsive to a second set of control signals selected from said plurality of control signals to independently turn each light source on and off;

wherein said first set of control signals and ssid second set of control signals are synchronized to turn on and off each light source when the corresponding aperture is opened and closed respectively, such that there is no illumination behind the corresponding aperture when closed.