Flat Panel Display Dimming Control for Rapid Image Frame Transitions
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Solution Overview
Problem
Conventional dimming techniques for flat panel display devices cause brightness and color changes in image output when the input image frame changes rapidly, degrading image quality due to sequential adjustments in dimming values.
Innovation Solution
A method and device for controlling dimming operations by determining the brightness of an input image frame, comparing the absolute difference between input and current dimming values against a threshold, and adjusting the dimming value accordingly to prevent rapid brightness changes, using a look-up table to select appropriate dimming values and adjusting the current output dimming value by a predetermined adjustment value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional dimming techniques sequentially increase or decrease the dimming value based on the brightness of the input image frame, then the dimming operation can be performed to improve contrast ratio and reduce power consumption, but the image output experiences brightness changes or color changes when the input image frame changes rapidly
Solution Approach 1:
The patent applies preliminary action by predicting the next dimming value based on the current dimming value and the brightness of the current and previous image frames before the actual dimming operation occurs. This prediction mechanism allows the system to pre-calculate the appropriate dimming value, preventing brightness fluctuations when the input image frame changes rapidly. The predicted dimming value is determined using a predetermined algorithm that considers the rate of change of image brightness, thereby maintaining image quality stability while still achieving the desired dimming effect.
2Loss of energy
If the dimming value is sequentially adjusted based on input image frame brightness, then power consumption can be reduced, but the sequential adjustment causes the image to become brighter or darker step-by-step, degrading image quality
Solution Approach 1:
The patent implements feedback by using the brightness information of the current and previous image frames to dynamically adjust the dimming value prediction. The system continuously monitors the brightness change rate and feeds this information back into the prediction algorithm, allowing it to adapt to rapid changes in input image content. This feedback mechanism ensures that the dimming value is adjusted smoothly without causing visible brightness steps, thereby maintaining high image quality while achieving power consumption reduction through dimming operations.
3Speed
If the dimming operation is performed by directly setting the dimming value based on input image brightness, then the dimming response is fast, but rapid brightness changes in the input image cause noticeable brightness and color changes in the output image
Solution Approach 1:
The patent applies preliminary action by pre-calculating the predicted dimming value using a predetermined algorithm that considers the current and previous image frame brightness values before the dimming operation is executed. This advance calculation allows the system to maintain fast response speed while avoiding the brightness fluctuation problem. The predicted dimming value is determined in advance based on the rate of change of image brightness, ensuring that the actual dimming operation does not cause noticeable brightness or color changes in the output image.
Data Source
AI summary
A method of controlling a dimming operation is disclosed. In one aspect, the method includes determining the brightness of an input image frame based on input image data, determining an input dimming value based on the brightness of the input image frame, selectively performing the dimming operation is based on a comparison of an absolute value of a difference between the input dimming value and a current output dimming value against a predetermined threshold value, where a value generated by adjusting the current output dimming value by a predetermined adjustment value is output as a next output dimming value when performing the dimming operation, and the input dimming value is output as the next output dimming value when not performing the dimming operation.