Display Brightness Compensation via Refresh Rate Interpolation
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Solution Overview
Problem
Display panels experience noticeable brightness changes when the refresh rate is reduced to conserve power, affecting user perception and visual quality.
Innovation Solution
Implementing a timing controller that uses look-up tables (LUTs) to adjust pixel values, compensating for brightness changes by interpolating between stored values for different refresh rates, ensuring the display maintains desired brightness levels even at lower refresh rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the refresh rate of the display is lowered to save power, then power consumption is reduced, but the display brightness decreases and becomes perceptibly dimmer
Solution Approach 1:
The patent applies parameter changes by adjusting pixel values dynamically based on the refresh rate. Look-up tables store compensation values that modify pixel brightness parameters according to the current refresh rate, allowing the display to maintain perceived brightness while operating at lower refresh rates to save power
Solution Approach 2:
The patent implements preliminary action by pre-calculating and storing brightness compensation values in look-up tables before actual display operation. These pre-computed compensation values are then applied in real-time based on the current refresh rate, eliminating the need for complex real-time calculations and enabling rapid adaptation to different refresh rates
2Loss of energy
If the refresh rate is reduced during panel self-refresh, then power consumption decreases, but visual quality and brightness perception are impacted
Solution Approach 1:
The patent changes the pixel value parameters based on refresh rate by using look-up tables that map refresh rates to corresponding compensation values. This allows the system to adapt pixel brightness parameters dynamically, maintaining visual quality across different refresh rates while achieving power savings
Solution Approach 2:
The patent introduces an intermediary mechanism (look-up table with compensation values) between the refresh rate control and the actual pixel rendering. This intermediary processes the refresh rate information and generates appropriate compensation values that maintain visual quality while enabling power-efficient operation at lower refresh rates
Data Source
AI summary
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.