Electrophoretic Display Afterimage Removal via Pixel-Wise Refresh
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Solution Overview
Problem
Electrophoretic displays (EPDs) face challenges in displaying video without interruptions or delays, experiencing afterimages due to slow image update times and screen flickering during conversion, which affects user experience and power efficiency.
Innovation Solution
A display apparatus and method that perform pixel-wise refresh functions to remove afterimages by using afterimage modeling information to determine and refresh pixels based on grayscale changes across image frames, reducing flickering and enhancing user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrophoretic display performs screen conversion by applying voltage to entire screen and performing refreshing, then afterimages are removed, but screen flickering occurs
Solution Approach 1:
The patent divides the screen into multiple regions (first region and second region) and applies different refresh strategies to each region. The first region undergoes complete refresh while the second region uses partial refresh, thereby removing afterimages in critical areas while minimizing flickering in less critical areas.
Solution Approach 2:
Different refresh modes are applied to different regions of the screen based on their specific requirements. The first region (containing important information) receives full refresh treatment while the second region receives partial refresh, optimizing the balance between afterimage removal and flicker reduction for each local area.
2Loss of energy
If electrophoretic display updates image slowly, then power consumption is reduced, but afterimages occur and video display is interrupted
Solution Approach 1:
Instead of refreshing the entire screen or no screen, the patent applies partial refresh only to specific regions where afterimages are most problematic. This partial action approach reduces power consumption compared to full refresh while effectively removing afterimages in critical areas.
Solution Approach 2:
The screen is segmented into regions with different refresh requirements. By updating only the first region completely and the second region partially, the system reduces overall power consumption while maintaining image quality where it matters most.
3Reliability
If electrophoretic display performs full screen refresh, then afterimages are removed, but power loss increases
Solution Approach 1:
The patent applies different refresh intensities to different regions based on their importance. The first region receives full refresh treatment to ensure complete afterimage removal, while the second region receives partial refresh to reduce power consumption in areas where afterimages are less critical.
Solution Approach 2:
Rather than performing excessive full-screen refresh, the patent applies just enough refresh action to the second region to adequately address afterimages in that area, thereby reducing overall power loss while maintaining acceptable image quality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces screen flickering, decreases user fatigue, and improves the perceived velocity of image updates while minimizing power loss, allowing for more natural and efficient screen conversion.
Implementation Method 1
an electrophoretic display (EPD) refers to a display apparatus that implements a screen by moving white and black particles within substrates according to an electric principle
Data Source
AI summary
A display apparatus and method are provided. The display apparatus includes a display, a storage which stores afterimage modeling information the includes afterimage information based on grayscale changes in a plurality of image frames, and a controller which controls the display to consecutively display the plurality of image frames and pixel-wise refresh pixels for afterimage removal in each image frame based on the afterimage modeling information. Therefore, flickering of a display screen can be reduced and the viewing fatigue of a user can decrease when the screen is converted.