Display Gain Control for Grayscale-Based Afterimage Reduction
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Solution Overview
Problem
Display devices face challenges in effectively managing luminance changes during screen saver functions to prevent afterimages and reduce power consumption, as current methods either cause visible luminance changes or are ineffective in reducing afterimages and power consumption.
Innovation Solution
A display device and driving method that adjusts a set time and gradually decreases gain values based on grayscale values, motion degree, and load values in different image regions to optimize luminance transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the set time for lowering luminance is relatively fast, then the response speed is improved, but the luminance change is visually recognized by the user causing poor image quality
Solution Approach 1:
The patent applies dynamics by making the set time variable rather than fixed. The set time is dynamically adjusted based on the grayscale values of the still image region, allowing the system to optimize between response speed and visual perception for different image characteristics.
Solution Approach 2:
The patent changes the parameter of set time based on the grayscale values of the still image region. By adjusting this parameter according to image characteristics, the system achieves both fast response when appropriate and minimal visible change when needed.
2Object-affected harmful factors
If the set time for lowering luminance is relatively slow, then the luminance change is less visually recognized, but the effect of preventing afterimages and reducing power consumption is reduced
Solution Approach 1:
The patent adjusts the set time parameter based on grayscale values to optimize the balance between reducing visible luminance changes and maintaining effective afterimage prevention and power consumption reduction.
Solution Approach 2:
The system uses feedback from grayscale value analysis of the still image region to determine the appropriate set time, creating a closed-loop control that optimizes both visual quality and energy efficiency.
3Device complexity
If a fixed set time is used for screen saver function, then the device complexity is reduced, but the effectiveness in preventing afterimages and reducing power consumption is reduced
Solution Approach 1:
The patent implements parameter changes based on image characteristics (grayscale values) to optimize power consumption and afterimage prevention without requiring complex additional hardware or control mechanisms.
Data Source
AI summary
A display device includes: a gain provider configured to set a time point elapsed by a set period from a time point at which a first region of an input image is detected as a still region, as a set time, and to gradually decrease a gain value from the set time; and a grayscale converter configured to generate an output image by applying the gain value to the first region and a second region including a peripheral region of the first region among the input image, wherein the gain provider is configured to set the set period differently according to size of grayscale values in the first region.