Shielding Electrode for Electrophoretic Display Color Reproducibility
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Solution Overview
Problem
Electrophoretic displays suffer from color mixing and deteriorated color reproducibility due to electric field interference between adjacent pixel electrodes, which affects the movement of electrified particles and the display of gray-scale images.
Innovation Solution
Incorporating a shielding electrode between pixel electrodes, which receives a voltage corresponding to a black gray-scale level, to prevent color mixing and interference by absorbing light and shielding the electric field between adjacent pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If pixel electrodes are disposed adjacent to each other to form display regions, then the display area is increased, but electric field interference occurs between adjacent pixel electrodes causing color mixing and deteriorated color reproducibility
Solution Approach 1:
A shielding electrode is disposed between adjacent pixel electrodes to act as an intermediary element. This shielding electrode receives a voltage corresponding to a black gray-scale level, creating an electric field that prevents the electric field interference between adjacent pixel electrodes, thereby preventing color mixing and improving color reproducibility while maintaining the increased display area
2Manufacturing precision
If a shielding electrode is disposed between pixel electrodes to prevent electric field interference, then color reproducibility is improved, but device complexity increases
Solution Approach 1:
The shielding electrode is merged with the common electrode structure, where the common electrode is divided into multiple regions including shielding regions between pixel electrodes and display regions. This integration reduces device complexity by combining the shielding function with the existing common electrode rather than adding a completely separate shielding structure
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 shielding electrode effectively prevents color mixing and improves color reproducibility by controlling the electric field and light absorption, enhancing the display of gray-scale images in electrophoretic displays.
Implementation Method 1
a fringe field is generated at a boundary portion between two adjacent pixel electrodes, thereby causing electric field interference between the adjacent two pixel electrodes
Implementation Method 2
The pigment particles move to the lower or upper substrate according to an electric field formed between the lower and upper substrates. As described above, a phenomenon that electrified particles move along the electric field is called an electrophoretic phenomenon
Implementation Method 3
the shielding electrode is disposed between the pixel electrodes and faces the common electrode with the electrophoretic layer interposed between the shielding electrode and the common electrode to receive a voltage corresponding to a black gray-scale
Data Source
AI summary
A display panel includes a first substrate, a second substrate, an electrophoretic layer, and a shielding electrode. The first substrate includes a first base substrate and pixel electrodes disposed on the first base substrate. The second substrate includes a second base substrate and a common electrode disposed on the second base substrate to face the pixel electrodes. The electrophoretic layer is disposed between the first substrate and the second substrate to display a gray-scale image. The shielding electrode is disposed between the pixel electrodes and faces the common electrode with the electrophoretic layer interposed between the shielding electrode and the common electrode to receive a voltage corresponding to a black gray-scale.