Method and system for reducing power consumption in a display

• US 7,532,195 B2
• Filed: 04/01/2005
• Issued: 05/12/2009
• Est. Priority Date: 09/27/2004
• Status: Expired due to Fees

• Current Assignee: Snaptrack Incorporated (Qualcomm, Inc.)
• Original Assignee: IDC, LLC
• Inventors: Sampsell, Jeffrey B.
• Primary Examiner(s): Hjerpe; Richard
• Assistant Examiner(s): Sherman; Stephen G
• Application Number:
  US11/097,827
• Publication Number:
  US 20060066597A1
• Time in Patent Office: 1,502 Days
• Field of Search: 345/204, 345/698, 345/699, 345/87, 345/76, 345/108, 359/245
• US Class Current: 345/108
• CPC Class Codes: G02B 26/001 based on interference in an adjustable optical cavity interference filters G02B5/28; devices or arrangements using multiple reflections in spectrometry or monochromators G01J3/26
• CPC Class Codes: G09G 2310/04 Partial updating of the display screen
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2340/0407 Resolution change, inclusive of the use of different resolutions for different screen areas
• CPC Class Codes: G09G 3/3466 based on interferometric effect
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127

Abstract

A method and system for reducing power consumption in a display includes driving a display comprising a plurality of display elements characterized by a display state. In a first mode of operation, the display state of substantially all the display elements is periodically re-set so as to display a first series of image frames. Upon changing to a second mode of operation, a second mode of operations comprises re-setting the display state of only a portion of the display elements so as to display a second series of image frames at a display element resolution which is less than said display element resolution used to display said first series of image frames.

Claims

1. A method of updating a display, said display comprising a plurality of display elements characterized by a display state, said method comprising:

in a first mode of operation, periodically re-setting said display state of substantially all said display elements at a first frame update rate so as to display a first series of image frames, said plurality of display elements being arranged as a plurality of pixels of said display, each pixel having two or more display elements; and

changing to a second mode of operation, wherein said second mode of operation comprises periodically re-setting said display state of a first portion of said display elements at a second frame update rate and periodically re-setting said display state of a remaining portion of said display elements at a third frame update rate that is less than said second frame update rate, said changing being triggered by a power level condition,

wherein in said second mode, a second series of image frames are displayed at a display element resolution which is less than said display element resolution used to display said first series of image frames, and

wherein said second mode comprises periodically re-setting said display state of a first display element in a first pixel at said second frame update rate and periodically re-setting said display state of a second display element in said first pixel at said third frame update rate.

2. The method of claim 1, wherein said first frame update rate is the same as said second frame update rate.

3. The method of claim 1, wherein said third frame update rate is varied over time.

4. The method of claim 1, wherein said third frame update rate is varied based at least in part on said second series of image frames.

5. The method of claim 1, wherein periodically re-setting said display state of said remaining portion of said display elements comprises determining said display state based at least in part on at least one of said second series of image frames.

6. The method of claim 1, wherein said changing to said second mode of operation comprises re-setting said display state of said remaining portion of said display elements.

7. The method of claim 1, wherein said second mode of operation consumes less power than said first mode.

8. The method of claim 1, wherein said second mode of operation is utilized under low battery conditions.

9. The method of claim 1, wherein said second mode of operation is utilized for displaying motion picture data.

10. The method of claim 1, wherein said second mode of operation displays a reduced color gamut as compared to said first mode of operation.

11. The method of claim 1, wherein said second mode of operation displays a reduced gray scale as compared to said first mode of operation.

12. The method of claim 1, wherein said plurality of display elements comprises a MEMS array arranged in rows and columns and wherein said remaining portion comprises a selected subset of the columns.

13. The method of claim 1, wherein said plurality of display elements comprises a MEMS array of rows and columns and wherein said remaining portion comprises a selected subset of the rows.