Color Electronic Paper Driving Method for Clear Black Display
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Solution Overview
Problem
Existing color electronic paper displays experience unclear images, particularly at high temperatures, due to interference between white and black particles, leading to poor display quality of black-on-white images.
Innovation Solution
A method for driving color electronic paper that involves applying specific driving signals to microcapsules with white, black, and colored particles, ensuring the black particles are moved closer to the display side after the white particles, and using pulse repetition units to optimize the display of colored particles, while also incorporating a balance and shaking phase to maintain electric field balance and prevent particle interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If white particles are driven to the display side before black particles, then white display is achieved, but black particles remain dispersed causing unclear black display
Solution Approach 1:
The patent applies a preliminary driving signal to gather black particles at the center of the microcapsule before driving white particles to the display side. This preliminary action ensures that when black particles are subsequently driven to the display side, they move as a concentrated group rather than dispersing, thereby achieving clear black display while maintaining efficient display refreshing rate.
Solution Approach 2:
The patent segments the display process into distinct phases: a first driving signal phase for white particle display, and a second driving signal phase for black particle display. By separating these operations temporally and using different driving signals with appropriate voltage values and durations, the patent achieves both clear white and black displays without interference between particle types.
2Productivity
If high voltage is applied to drive particles quickly, then display refreshing rate improves, but particle dispersion and interference increase reducing display quality
Solution Approach 1:
The patent employs dynamic driving signals with varying voltage values and durations tailored to each display phase. The first driving signal uses a voltage value and duration optimized for white particle movement, while the second driving signal uses different parameters optimized for black particle movement. This dynamic adjustment allows particles to move efficiently without excessive voltage causing dispersion, thereby maintaining both high refreshing rate and clear display 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
This method enhances the clarity of black and colored displays by ensuring the black particles are displayed without interference from white particles, improving the display quality and refreshing rate, especially at high temperatures.
Implementation Method 1
The electronic paper display device controls the movement of the electrophoretic particles by controlling an electric field generated by the first and second electrodes
Implementation Method 2
The electronic paper display device controls the movement of the electrophoretic particles by controlling an electric field generated by the first and second electrodes
Data Source
AI summary
The application provides a method for driving a color electronic paper, including: according to an image to be displayed, applying a first driving signal to a first electrode on a to-display-white microcapsule and a second driving signal to a first electrode on a to-display-black microcapsule. The first driving signal includes: a first sub-driving signal applied to the first electrode on the to-display-white microcapsule in display phase; and the first sub-driving signal is configured to drive a white particle in the to-display-white microcapsule to be closer to a display side than a black particle and a colored particle. The second driving signal comprises: a second sub-driving signal applied to the first electrode on the to-display-black microcapsule in display phase, and the second sub-driving signal is configured to drive the black particle in the to-display-black microcapsule to be closer to the display side than the white particle and the colored particle.