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EP0494610A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

TFT LCD control method for setting display controller in sleep state when no access to vram is made

Assignee: Toshiba Corp
•
Filing: 1992-01-03
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Granted: —
•
Expires: 2012-01-03
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Abstract

Abstract An electronic apparatus having a TFT LCD (37) includes a detector (41, 47) for detecting whether or not display data in a video RAM (25) is rewritten. When a rewrite operation of display data is detected, a display controller reads out display data from the video RAM, and supplies the readout display data to the TFT LCD. When data on a memory plane for storing display data, which is being displayed on the TFT LCD, is rewritten, the display controller (24) reads out display data from the video RAM, and supplies the readout display data to the TFT LCD. When display data to be written in the video RAM is the same as the already stored display data, the display controller does not supply the display data from the video RAM to the TFT LCD. When no access to VRAM is made, the display controller is set in a sleep state.

Inventors

  • 👤 Nobutaka c/o Intell. Prop. Div. Nakamura
  • 👤 Hiroki c/o Intell. Prop. Div. Zenda

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 16:42
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3648; G09G2330/00; G09G2330/02; G09G2330/021

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 113 words
An electronic apparatus comprising: storage means (25) for storing display data; a display device (37) for holding display data output from said storage means in units of pixels, and displaying the display data; detection means (41, 47) for detecting that display data stored in said storage means have not been rewritten for a predetermined period of time; and display control means (43, 45) for reading out display data from said storage means to output the readout data to the display device, and for, when the detection means detects that the display data have been rewritten, reading out the display data from said storage means to supply the readout data to said display device.
Claim 2
Dependent Claim 127 words
An apparatus according to claim 1, characterized in that said storage means has a first display data storage area for storing data displayed on said display device, and a second display data storage area for displaying data which are not displayed on said display device, and said apparatus further comprises display data rewrite detection means for detecting whether or not data stored in said first display data storage area have not been rewritten for a predetermined period of time, and when said display data rewrite detection means detects that data stored in said first display data storage area have not been rewritten for the predetermined period of time, said display control means sets a read operation of display data from said storage means in a sleep state.
Claim 3
Dependent Claim 111 words
An apparatus according to claim 1, further comprising coincidence detection means for detecting whether or not rewritten data in said storage means is the same as data before rewriting; and second detection means for, when said coincidence detection means detects that the written data is the same as data before rewriting, determining that no data is rewritten, and detecting that display data stored in said storage means have not been rewritten for a predetermined period of time, and wherein when said second detection means detects that display data have not been rewritten, said display control means sets a read operation of display data from said storage means in a sleep state.
Claim 4
Dependent Claim 111 words
An electronic apparatus comprising: input means for inputting data; storage means for storing display data corresponding to data input from said input means; control means for reading out display data from said storage means; a display device for holding display data read out from said control means in units of pixels, and displaying the display data; detection means for detecting that data have not been input from said input means for a predetermined period of time; and means for, when said detection means detects that data have not been input for the predetermined period of time, setting a read operation of display data by said control means in a sleep state.

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