Display Gain Control for Screen Saver Flicker Reduction
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Solution Overview
Problem
Display devices experience flickering due to image pattern changes when using a screen saver function, which reduces luminance and increases power consumption.
Innovation Solution
A display device with a gain provider that adjusts gain values based on load values and frame counts to gradually decrease and maintain luminance, using a current sensor to manage power consumption and reduce flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the screen saver function decreases luminance to prevent afterimage and reduce power consumption, then power consumption is reduced and afterimage is prevented, but flicker occurs when transitioning to moving images
Solution Approach 1:
The patent implements dynamic adjustment of the first period length based on image pattern characteristics. The gain provider determines different first period lengths according to the load value calculated from grayscale values, allowing the system to adapt between screen saver mode (low luminance, long first period) and normal operation (higher luminance, short first period), thereby eliminating flicker while maintaining power savings
Solution Approach 2:
The patent changes the parameter of first period length dynamically based on image content. By calculating load values from grayscale values and using lookup tables, the system adjusts the first period length to match different image patterns, resolving the contradiction between power consumption reduction and flicker prevention
2Illumination intensity
If the luminance is increased again when changing from still image to moving image, then display quality is restored, but flicker occurs according to image pattern
Solution Approach 1:
The patent applies preliminary action by gradually increasing the gain value during the first period before fully restoring luminance. This gradual transition prevents sudden luminance changes that cause flicker, while still achieving the necessary luminance restoration for moving images. The gain provider uses lookup tables to determine appropriate gain values based on load values
Solution Approach 2:
The system dynamically adjusts the gain value and first period length based on real-time image pattern analysis. By calculating load values from grayscale values and adapting the first period length accordingly, the system smoothly transitions between still and moving images without flicker, maintaining both display quality and energy efficiency
Data Source
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AI summary
The present disclosure provides a display device. The display device includes a gain provider for gradually decreasing a gain value from a first time when a first period elapses from a time at which an enable signal is generated, and a plurality of pixels for receiving data voltages determined by the gain value and the input grayscale values. The gain provider determines a length of the first period according to a first load value based on the input grayscale values at the time at which the enable signal is generated.