Electronic Paper Display Driving Method for Image Sticking Prevention
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Solution Overview
Problem
Electronic paper displays face issues with image sticking due to the movement of red particles among black particles during the display of black images, affecting the quality of the display.
Innovation Solution
A driving method for an electronic paper display apparatus that includes a controller, base substrate, and pixel driving circuits with microstructures containing black, white, and color particles, where specific driving signals with varying voltages and durations are applied to separate and position the particles accurately, preventing image sticking by ensuring the correct positioning of particles during the display of different colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional driving signals are applied to display black images, then black particles can be positioned, but red particles move among black particles causing image sticking
Solution Approach 1:
The driving signal is segmented into multiple stages: a first driving signal for initial particle positioning, and a second driving signal specifically designed to prevent red particle movement among black particles during black image display. This segmentation allows targeted control of different particle behaviors to eliminate image sticking while maintaining positioning accuracy.
Solution Approach 2:
The first driving signal is applied preliminarily to position particles before the actual black image display. This preliminary positioning ensures that particles are correctly arranged, and the subsequent second driving signal prevents unwanted movement during display, thereby preventing image sticking before it can occur.
2Illumination intensity
If multiple particle types are used for color display, then display quality improves, but particle interference increases
Solution Approach 1:
Different driving signals are applied to different particle types based on their specific characteristics. The first driving signal addresses black and white particle positioning, while the second driving signal specifically targets red particle behavior. This localized control approach manages particle interference while maintaining high display quality through precise control of each particle type's movement.
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 method effectively prevents image sticking by ensuring that black, white, and red particles are correctly positioned, enhancing the display quality and reducing interference between particles of different colors, thereby improving the overall image clarity and accuracy.
Implementation Method 1
The controller controls a movement of the electrophoretic particles by controlling an electric field generated by the common electrode and the pixel electrode
Implementation Method 2
a charge-to-mass ratio of the black particles is greater than a charge-to-mass ratio of the color particles; where the driving method includes: inputting, by the controller, a first driving signal to the pixel electrode
Data Source
AI summary
A driving method of an electronic paper display apparatus, including: inputting, by a controller, a first driving signal to a pixel electrode of a pixel driving circuit corresponding to a pixel which is required to display black, according to an image to be displayed; and inputting, by the controller, a second driving signal to a pixel electrode of a pixel driving circuit corresponding to a pixel which is required display white, according to the image to be displayed. A driving stage of the electronic paper display apparatus comprises a first homogenization stage which comprises a plurality of homogenization sub-stages. At a last homogenization sub-stage, the first and second driving signals comprise first and second driving sub-signals, respectively. Voltages of the first driving sub-signal and the second driving sub-signal have polarities opposite to polarities of the black particles and the white particles, respectively.