Current Limiting Circuit for Display Power Control
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Solution Overview
Problem
Existing display devices face challenges in reducing power consumption when luminance represented by a video signal abruptly increases, leading to potential exceedance of control target power values.
Innovation Solution
A current limiting circuit that includes a delay circuit, a calculation circuit, and a gain multiplication circuit to adjust the current consumption of pixels based on power consumption calculations for one or two frames, ensuring power remains within target limits by delaying video signals and calculating gains to multiply them accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If current limiting is performed based on horizontal period power consumption calculation, then power consumption is reduced under normal conditions, but power consumption exceeds control target when luminance abruptly increases
Solution Approach 1:
The patent applies preliminary action by calculating power consumption based on delayed video signals from one frame ago before the actual frame is displayed. This allows the system to predict and prepare for upcoming high-luminance content, adjusting current limits in advance to prevent power consumption from exceeding the control target when luminance abruptly increases.
2Use of energy by stationary object
If video signal is delayed by one frame for power consumption calculation, then future power consumption can be predicted, but real-time response is reduced
Solution Approach 1:
The patent implements dynamics by using different calculation approaches for different scenarios: for gradual luminance changes, it uses the delayed one-frame signal for accurate prediction, while for abrupt changes, it incorporates real-time power consumption data from the current frame to quickly adjust current limits, thus adapting the response speed to the situation.
Data Source
AI summary
A current limiting circuit includes: a delay circuit that receives a video signal, and outputs a delay signal obtained by delaying the video signal by a time period corresponding to one frame; a calculation circuit that receives the video signal, and calculates a gain by which the delay signal is to be multiplied, based on power consumption of the pixels corresponding to the delay signal and power consumption of the pixels corresponding to the video signal; and a gain multiplication circuit that multiplies the delay signal by the gain.