Conductive Optical Adhesive Electrophoretic Display Panel
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Solution Overview
Problem
Existing electrophoretic display panels with color light-filtering layers suffer from poor optical indicators such as reflectivity, color gamut, and serious color cast, leading to suboptimal display effects.
Innovation Solution
The use of an electrophoretic fluid comprising a conductive optical adhesive and electrophoretic units, where the conductive optical adhesive has properties of electricity conducting, light transmission, and bonding, allowing the electrophoretic layer to be directly bonded to the substrate without an intermediate adhesive layer, thereby reducing the distance between the color light-filtering layer and the electrophoretic layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an electrophoretic layer including black particles and white particles and a color light-filtering layer are stacked, then color display is achieved, but optical indicators such as reflectivity and color gamut deteriorate with serious color cast
Solution Approach 1:
The patent combines the electrophoretic layer and color light-filtering layer into a single integrated electrophoretic display layer. The color light-filtering particles are incorporated directly into the electrophoretic composition, eliminating the need for a separate stacked color light-filtering layer. This merging reduces optical interfaces and improves light utilization, thereby enhancing reflectivity and color gamut while maintaining color display capability.
Solution Approach 2:
The patent uses composite particles comprising color light-filtering materials combined with electrophoretic functional materials. These composite particles integrate the light-filtering properties needed for color display with the electrophoretic response characteristics, allowing simultaneous achievement of color display and improved optical indicators without the drawbacks of separate layered structures.
2Strength
If an intermediate adhesive layer is used between the electrophoretic layer and substrate, then bonding is achieved, but the distance between color light-filtering layer and electrophoretic layer increases, degrading display effect
Solution Approach 1:
The patent merges the bonding function with the electrophoretic display layer by incorporating adhesive materials directly into the electrophoretic composition. This eliminates the need for a separate intermediate adhesive layer, thereby maintaining minimal distance between the color light-filtering layer and electrophoretic particles while still achieving effective bonding to the substrate.
Solution Approach 2:
The electrophoretic display layer is designed to perform multiple functions simultaneously: it provides electrophoretic display functionality, color filtering, and substrate bonding. By integrating adhesive properties into the electrophoretic layer formulation, the layer becomes multi-functional, eliminating the need for separate specialized layers and reducing overall structure thickness.
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 reduces optical crosstalk, eliminates color cast, improves color gamut, and enhances reflectivity, resulting in a significantly improved display effect for the electrophoretic display panel.
Implementation Method 1
The conductive optical adhesive has properties of electricity conducting, light transmission, and bonding
Implementation Method 2
two types of particles with opposite charges in the electrophoretic layer, specifically, black particles and white particles, are driven by an electric field between the common electrode layer and the pixel electrode layer to move to two electrode layers close to the display panel
Implementation Method 3
the black particles absorb incident light and the white particles reflect incident light to display a black-and-white pattern
Implementation Method 4
the black particles absorb incident light and the white particles reflect incident light to display a black-and-white pattern
Implementation Method 5
The conductive optical adhesive has properties of electricity conducting, light transmission, and bonding
Data Source
AI summary
A display panel includes a first substrate, a second substrate, and an electrophoretic layer and a conductive adhesive layer that are located between the first substrate and the second substrate. The first substrate includes a common electrode layer and a color light-filtering layer that are stacked. The second substrate includes a pixel electrode layer. The electrophoretic layer is disposed on a surface of the color light-filtering layer or the common electrode in the first substrate. The electrophoretic layer includes a conductive optical adhesive film and a plurality of electrophoretic units. The electrophoretic units are distributed in the conductive optical adhesive film. The conductive optical adhesive film is directly bonded to the color light-filtering layer or the common electrode. There is no other adhesive layer between the electrophoretic layer and the first substrate. The conductive adhesive layer is disposed between the electrophoretic layer and the second substrate.