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Compensation methods for display brightness change associated with reduced refresh rate

A technology of brightness change and refresh rate, applied in static indicators, instruments, etc., to solve problems such as dimness and reduced brightness of the display

Active Publication Date: 2015-11-18
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when a display's refresh rate is reduced to save power, the display may display reduced brightness or otherwise become dimmer to the extent that this change in brightness is perceptible to the naked eye

Method used

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  • Compensation methods for display brightness change associated with reduced refresh rate
  • Compensation methods for display brightness change associated with reduced refresh rate
  • Compensation methods for display brightness change associated with reduced refresh rate

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Embodiment Construction

[0011] The present disclosure can be understood by referring to the following detailed description in conjunction with the accompanying drawings described below. It should be noted that for clarity of illustration, some elements in the various figures may not have been drawn to scale.

[0012] The present disclosure provides apparatus and methods for compensating for possible brightness variations that may occur when the refresh rate of a display is reduced, especially during the refresh phase of display operation. The refresh rate may eg be reduced during such a self-refresh phase and increased during another sequence or operation of the display panel. Therefore, the panel can have a variable refresh rate.

[0013] If the predicted or actual uncompensated luminance change of the display is relatively large when the refresh rate is reduced, compensation may be performed on a pixel or sub-pixel basis. For a particular display panel, the brightness at each pixel level can be m...

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Abstract

A method and system are provided for compensating for brightness changes in a display having an array of display pixels. The method includes storing a plurality of look-up tables, where each table has a plurality of brightness signals that provide compensation for a brightness change when the refresh rate is changed during a panel self-refresh. The method also includes using display control circuitry to determine the refresh rate associated with an input signal and to determine a compensation based on the refresh rate. The display control circuitry may, for example, use non-linear interpolation to generate a look-up table for the refresh rate. The display control circuitry may adjust the input signal based on the look-up table to produce an output signal that compensates for a brightness change at the refresh rate. The output signal may be transmitted to the array of display pixels.

Description

[0001] This application claims priority to U.S. Patent Application No. 13 / 801,918, filed March 13, 2013, and U.S. Continuation-in-Part Patent Application No. 14 / 059,329, filed October 21, 2013, which are hereby incorporated by reference in their entirety . technical field [0002] Embodiments described herein relate generally to panel self-refresh (PSR) for displays. More specifically, certain embodiments relate to methods for compensating for changes in brightness caused by changes in refresh rate. Background technique [0003] Panel Self Refresh (PSR) updates the display at a reduced refresh rate. Generally speaking, the reduced refresh rate is lower than the frame rate of the monitor, which is usually 60Hz. When the display is updated at a reduced refresh rate, less power is consumed because each update of the display requires some power consumption. For example, if the display is refreshed at a refresh rate of 30 Hz during panel self-refresh (PSR), or even lower, the ...

Claims

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Application Information

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IPC IPC(8): G09G3/20
CPCG09G3/3406G09G3/2007G09G2320/0242G09G2320/0276G09G2320/0285G09G2320/0626G09G2320/103G09G2330/021G09G2340/0435
Inventor M·阿尔布雷希特C·P·A·谭N·G·罗兰德S·H·皮恩茨金太星
Owner APPLE INC
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