Electrophoretic Display with Low-Temperature Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electrophoretic display devices face issues with increased thickness and reduced reflectivity due to the use of color filter thin films adhered with optical glue or double-sided adhesive, which also cause display quality problems due to relative displacement during the sealing process.
Innovation Solution
A display device structure with a color filter layer and transparent electrode layer formed on a substrate without adhesion, sealed by a transparent sealing material that can cure at low temperatures, reducing thickness and preventing displacement, and enhancing display quality by improving viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If color filter thin film is adhered above display medium via optical glue or double-sided adhesive, then color filter layer can be positioned, but device thickness increases and reflectivity is reduced
Solution Approach 1:
The patent removes the adhesive layer and optical glue from the structure, extracting the harmful elements that cause thickness increase and reflectivity loss. The color filter layer is directly formed on the display medium without requiring adhesive bonding, thereby eliminating the gap and reducing overall device thickness while maintaining positioning precision through direct formation.
Solution Approach 2:
The patent merges the color filter layer formation process with the display medium fabrication process. The color filter layer is formed directly on the display medium in the same fabrication sequence, eliminating the need for separate adhesive bonding steps and reducing the number of interfaces that would cause reflectivity loss.
2Manufacturing precision
If color filter thin film is adhered via optical glue or double-sided adhesive, then color filter layer can be positioned, but gap is produced causing loss in overall reflectivity
Solution Approach 1:
The patent extracts and removes the optical glue and double-sided adhesive from the structure. By eliminating these adhesive materials, the gap between the color filter layer and display medium is eliminated, thereby preventing the reflection loss that would occur at the air-gap interfaces and improving overall optical reflectivity.
Solution Approach 2:
The patent eliminates the intermediary adhesive layer that was causing the gap. Instead, the color filter layer is directly formed on the display medium, creating a seamless interface that maintains optical continuity and prevents reflectivity loss at interfaces.
3Reliability
If sealing is applied to surround and seal display layer, then external moisture is blocked, but relative displacement is produced between color filter thin film and display layer during curing
Solution Approach 1:
The patent performs the color filter layer formation before the sealing process. By pre-forming the color filter layer on the display medium and then applying sealing, the sealing process does not cause displacement of the color filter layer. The layer positioning is established in advance before sealing constrains the structure.
Solution Approach 2:
The patent merges the color filter layer formation with the display medium fabrication process, creating an integrated structure where the color filter layer is inherently positioned relative to the display medium. This integrated approach ensures that subsequent sealing processes do not cause relative displacement, as the layers are already firmly positioned.
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 solution results in a thinner, more reflective display device with improved display quality and reduced risk of displacement during fabrication, maintaining favorable positions of layers and enhancing viewing angles.
Implementation Method 1
a curable temperature of the transparent sealing is lower than or equal to 40° C.
Implementation Method 2
each pixel may display a required grayscale by applying a voltage to drive the white charged particles in the electrophoretic liquid. Furthermore, in order to expand applications of the electrophoretic display devices, a technology of fabricating color filter layers on a carrier thin film and adhering the film carrying the color filter layers above a display medium via an adhesive layer has also been proposed. As Such, after the white charged particles in the electrophoretic liquid reflect the external light
Implementation Method 3
a technology of fabricating color filter layers on a carrier thin film and adhering the film carrying the color filter layers above a display medium via an adhesive layer has also been proposed. As Such, after the white charged particles in the electrophoretic liquid reflect the external light, the reflected light may pass through the color filter thin film to perform display
Data Source
AI summary
A display device including a first substrate, a second substrate, a display layer, a color filter layer, a transparent electrode layer and a transparent sealing is provided. The first substrate is opposite to the second substrate. The display layer is disposed between the first substrate and the second substrate. The color filter layer is disposed between the display layer and the first substrate. The transparent electrode layer is disposed between the color filter layer and the display layer. The transparent sealing surrounds the display layer so that the display layer is sealed between the first substrate and the second substrate, wherein a curable temperature of the transparent sealing is lower than or equal to 40° C. A fabrication method of a display device is further provided herein.