Display Gain Control for Luminance and Power Trade-offs
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Solution Overview
Problem
Display devices face challenges in reducing power consumption and maintaining image quality, particularly when switching between still and moving images, as existing technologies do not effectively manage gain values to prevent afterimages and optimize luminance.
Innovation Solution
A display device with a first gain provider that linearly or exponentially increases the gain value based on the still image load, and a second gain provider that adjusts gain values based on the difference in grayscale values between still and peripheral areas, to generate output images that reduce power consumption and maintain original luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a screen saver function that decreases luminance is used to prevent afterimages and reduce power consumption, then power consumption is reduced and afterimages are prevented, but image quality deteriorates due to luminance loss
Solution Approach 1:
The patent applies preliminary action by gradually increasing the gain value before displaying a still image after a moving image. The gain value is increased in advance during a transition period to ensure the display device can quickly respond to the still image without maintaining high luminance throughout, thus preventing afterimages while preserving image quality when needed.
Solution Approach 2:
The patent implements dynamics by making the gain value changeable over time based on the display content. The gain value dynamically adjusts - increasing during transitions to still images and maintaining appropriate levels during still image display - allowing the system to optimize both power consumption and image quality adaptively rather than using a fixed luminance reduction approach.
2Illumination intensity
If the gain value is quickly increased to maximum to maintain original luminance of still images, then image quality is improved, but power consumption increases and afterimages may occur
Solution Approach 1:
The gain value is increased in advance during a transition period before the still image is fully displayed. This preliminary increase ensures the display device is prepared to show the still image at appropriate luminance without requiring sustained high gain values, thus maintaining image quality while reducing overall power consumption.
Solution Approach 2:
The patent applies periodic action by using different gain values at different time periods. During the transition period from moving to still images, the gain value follows a gradual increase pattern, while during the still image display period, the gain value is maintained at an appropriate level. This time-based periodic adjustment optimizes both luminance quality and power consumption.
3Device complexity
If a fixed gain value is used during still image display, then device complexity is reduced, but image quality deteriorates due to inability to adapt to different still image loads
Solution Approach 1:
The patent implements dynamics by making the gain value changeable based on still image load characteristics. The system dynamically determines whether to apply linear or exponential gain increase patterns depending on the specific still image being displayed, allowing adaptive optimization of image quality without requiring overly complex control mechanisms.
Solution Approach 2:
The patent applies parameter changes by modifying the gain value parameter based on the characteristics of the still image load. The system changes the gain value parameter dynamically - using different increase patterns (linear or exponential) and different maximum gain values - to adapt to different still image requirements, thereby maintaining image quality across various content types.
Data Source
AI summary
A display device includes a first gain provider which controls a first gain value during a first display period in which a still image is displayed, a second gain provider which controls a second gain value during a second display period in which a moving image including a still area is displayed, and a grayscale converter which applies the first gain value or the second gain value to an input image and generates an output image. The first gain provider linearly or exponentially increases the first gain value to a maximum gain value based on a load of the still image from a first time point when the second display period changes to the first display period to a second time point at which the first gain value starts to decrease from the maximum gain value.