Electronic equipment having a display device

• US 5,589,848 A
• Filed: 04/21/1995
• Issued: 12/31/1996
• Est. Priority Date: 08/07/1986
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Shimizu, Hirokimi
• Primary Examiner(s): Tung, Kee M.
• Assistant Examiner(s): Luu, Matthew
• Application Number:
  US08/427,715
• Time in Patent Office: 620 Days
• Field of Search: 345/87, 345/102, 59/48, 59/50, 364/707, 364/709.01, 364/709.06, 364/709.08, 364/709.15, 341/22, 341/23, 341/26, 341/27
• US Class Current: 345/102
• CPC Class Codes: G09G 2310/0237 Switching ON and OFF the backlight within one frame
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336

Abstract

An electronic equipment comprises a keyboard for entering data, a processor for processing the data entered by the keyboard, a display device for displaying processing result of the processor, an illumination lamp for illuminating a display screen, and a control circuit for turning off the illumination a predetermined time after the display of the processing result on the display device.

Claims

1. Electronic equipment comprising:

a keyboard for entering a plurality of kinds of data by a same key, comprising a selecting key for selecting one of said plurality of kinds of data to be entered by the same key;

display means for displaying data, said display means having a display screen;

illumination means for illuminating said display screen of said display means, having a first illumination state and a second illumination state;

a power supply included within said electronic equipment for supplying power to said electronic equipment;

first manual time setting means for setting an illumination time of said illumination means;

second manual time setting means for setting a power supply time of said power supply for said electronic equipment;

control means for changing an illumination state of said illumination means after completion of the illumination time set by said first manual time setting means to reduce power consumption by said illumination means; and

power supply control means for causing said power supply to stop the power after completion of the power supply time set by said second manual time setting means.

2. An electronic equipment according to claim 1 wherein said display means comprises a liquid crystal display.

3. An electronic equipment according to claim 1 further comprising indication means disposed on said keyboard for indicating the illumination state of said illumination means independently of said control means.

4. Electronic equipment comprising:

input means for entering information;

processing means for processing said information entered by said input means;

display means for displaying said information processed by said processing means;

back light means for said display means;

time memory means for storing desired time information entered by said input means;

checking means for checking on elapse of time of said desired time information;

control means for controlling said back light means to stop lighting of said back light means for said display means when said time of said desired time information has elapsed through said checking means to reduce power consumption by said back light means;

a power supply included within said electronic equipment for supplying power to said electronic equipment;

manual time setting means for setting a power supply time of said power supply for said electronic equipment; and

power supply control means for causing said power supply to stop the power after completion of the power supply time set by said manual time setting means.

5. An electronic equipment according to claim 4 wherein said display means comprises a liquid crystal display.

6. An electronic equipment according to claim 4 wherein said input means comprises a keyboard.

7. An electronic equipment according to claim 4 wherein said checking means comprises a counter for measuring elapse of time.

8. Electronic equipment comprising:

a keyboard for entering a plurality of kinds of data by a same key, having a shift key for selecting one of said kinds of data to be entered by the same key;

display means, including a display screen, for displaying data;

illumination means for illuminating said display screen of said display means, having a first illumination state and a second illumination state; and

control means, responsive to actuation of said shift key of said keyboard, for determining whether said shift key has been depressed for a first predetermined period of time, and when said shift key has been determined to be so depressed, for changing a selection of said kinds of data to be entered by the same key and for detecting whether said shift key has been continuously depressed for a second predetermined period of time that is longer than the first predetermined period of time, and when said shift key has been detected to be so continuously depressed, for changing said first illumination state into said second illumination state.