×

Method for reducing power consumption in a portable electronic device with a liquid crystal display screen

  • US 5,890,799 A
  • Filed: 11/10/1997
  • Issued: 04/06/1999
  • Est. Priority Date: 05/18/1995
  • Status: Expired due to Term
First Claim
Patent Images

1. A portable electronic device having a liquid crystal display screen wherein the portable electronic device receives inputs from a surface of the liquid crystal display screen further wherein the liquid crystal display screen includes at least, the portable electronic device comprising:

  • a central processing unit;

    an interrupt signaler, including at least one detection panel of the liquid crystal display screen and a transistor, coupled to a bus, wherein the interrupt signaler generates a first interrupt signal on the bus when input commences on the surface and generates a second interrupt signal on the bus when input ceases on the surface, as detected by the at least one detection panel, and wherein the interrupt signaler is activated when the transistor is switched to a first logic state; and

    an interrupt controller, coupled to the bus, for switching the central processing unit from operating at a low power mode to a high power mode in response to reception of the first interrupt signal on the bus and for switching the central processing unit from operating at a high power mode to a low power mode in response to reception of the second interrupt signal on the bus.

View all claims
  • 17 Assignments
Timeline View
Assignment View
    ×
    ×