Color Electrophoretic Display Stylus Latency Reduction
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Solution Overview
Problem
Color electrophoretic displays face significant response latency due to the complex movement of multiple color particles, leading to unsatisfactory customer experience, especially in applications requiring rapid color switching and writing input.
Innovation Solution
The display method involves using an achromatic color particle and multiple chromatic color particles to create a black trace with a refresh time of less than 50 ms, followed by transferring this trace into a color trace of the specified stylus color, which has a refresh time 5-10 times longer, thereby minimizing perceived latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple chromatic color particles are used to achieve color display, then color variety is improved, but response time increases significantly
Solution Approach 1:
The patent divides the color display process into two separate stages: first displaying the black trace using only achromatic particles (fast response), then transferring to the assigned color using chromatic particles (color accuracy). This segmentation allows each stage to optimize for its specific function, resolving the contradiction between color variety and response time.
Solution Approach 2:
The black trace is displayed preliminarily before the final color rendering. This preliminary action provides immediate visual feedback to the user, masking the subsequent time required for color particle rearrangement. The black trace serves as a placeholder that is later replaced by the colored trace.
2Adaptability or versatility
If color particles are moved to achieve color switching, then color display capability is improved, but refresh rate decreases
Solution Approach 1:
The patent extracts the black trace display function from the color display process. By using only achromatic particles for the black trace, the system eliminates the need to move chromatic particles during the initial display phase, achieving a refresh rate below 50ms while maintaining full color display capability for the subsequent color trace.
3Loss of time
If prediction method is used to reduce writing latency, then response time is improved, but color accuracy deteriorates due to additional particle rearrangement
Solution Approach 1:
The patent segments the writing process into two distinct phases: the black trace phase (using prediction method for fast response) and the color trace phase (for color accuracy). This segmentation allows the prediction method to be applied without compromising color accuracy, as the color particles are only rearranged once during the color trace phase rather than continuously during prediction corrections.
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 approach significantly reduces the latency in displaying color traces, enhancing user experience by ensuring that the black trace is displayed first, masking the delay in color rendering, and allowing for faster refresh rates than traditional color electrophoretic displays.
Implementation Method 1
An electrophoretic display performs color-changing display by modifying the position of a charged colored particle with respect to a viewing surface
Data Source
AI summary
A color electrophoretic display and a display method thereof are provided. The color electrophoretic display comprises an achromatic color particle and a plurality of chromatic color particles. The display method of the color electrophoretic display comprises turning on a stylus mode, providing an assigned stylus color, sensing a movement of the stylus to output a black trace, and transferring the black trace into a color trace of the assigned stylus color when the stylus movement stops. The black trace is shown when the achromatic color particle and the chromatic color particles move toward a top electrode, and a refresh time of the color of the black trace is smaller than 50 ms. The color of the assigned stylus color and the color of the black trace have brightness difference and at least one of the hue differences and the saturation differences.