Electronic Paper Display Panel with Non-Uniform Charged Particles
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Solution Overview
Problem
Existing electronic paper display devices suffer from low contrast and poor display effects due to the uniform size and charge of charged particles, leading to inefficient light reflection and absorption.
Innovation Solution
The electronic paper display panel incorporates a plasma layer with electrophoretic fluid and first-type charged particles, which include subparticles of different sizes and charge quantities, arranged such that (D1-D2) × (q1-q2) > 0, allowing for a dense packing of charged particles to enhance light reflection and absorption, thereby improving contrast and display effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If uniform size and charge of charged particles are used, then the device structure is simple, but the light reflection and absorption efficiency is low resulting in poor display contrast
Solution Approach 1:
The patent applies local quality by creating charged particles with non-uniform properties - specifically, particles where the core and shell have different refractive indices and different charge densities. This local variation in properties allows different regions of the particle to contribute differently to light reflection and absorption, thereby improving display contrast while maintaining a relatively simple overall device structure.
Solution Approach 2:
The patent employs composite materials by constructing charged particles with a core-shell structure where the core and shell are made of materials with different refractive indices and charge characteristics. This composite structure enables the particle to simultaneously optimize both light reflection and absorption properties, resolving the contradiction between display contrast and structural simplicity.
2Manufacturing precision
If charged particles with different sizes and charges are used, then light reflection and absorption efficiency is improved, but the particle arrangement and control become more complex
Solution Approach 1:
The patent applies parameter changes by systematically varying specific parameters of the charged particles - namely the refractive index and charge density - while maintaining a controlled size distribution. This approach allows optimization of light reflection and absorption efficiency through parameter optimization rather than relying on complex multi-parameter control, thereby reducing the complexity of particle arrangement.
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 configuration achieves improved light reflection and absorption efficiency, resulting in enhanced display contrast and effect, ensuring a whiter white state and better overall display performance.
Implementation Method 1
The plasma layer includes an electrophoretic fluid and first-type charged particles
Data Source
AI summary
Provided are an electronic paper display panel and a display device. The electronic paper display panel includes a first substrate and a second substrate opposite to each other and a plasma layer between the first substrate and the second substrate. The plasma layer includes an electrophoretic fluid and first-type charged particles. The first-type charged particles have charges with a first electrical property. The first-type charged particles include first charged subparticles and second charged subparticles. The particle size of a first charged subparticle is D1. The particle size of a second charged subparticle is D2. The charge quantity carried by the first charged subparticle is q1. The charge quantity carried by the second charged subparticle is q2. (D1-D2)×(q1-q2)>0.