Transmissive Electrophoretic Display Pixel Structure Without Dark Adhesive
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Solution Overview
Problem
Conventional electrophoretic display devices are not light-transmitting due to misalignment of pixel electrodes with microcapsules and the use of a dark adhesive layer, which obstructs light transmission.
Innovation Solution
The transmissive electrophoretic display device incorporates a partition layer with openings exposing light-transmitting regions, featuring first and second control electrodes in respective pixel regions, and a light-transmitting conductive substrate, eliminating the need for a dark adhesive layer and enabling light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a dark adhesive layer is used to attach the electrophoretic layer to the element array substrate, then the attachment strength is improved, but the light transmission is blocked
Solution Approach 1:
The patent removes the dark adhesive layer from the optical path by using a partition layer structure that attaches the electrophoretic layer to the element array substrate without requiring a continuous adhesive layer in the light-transmitting regions. The partition layer with openings allows direct attachment at the boundaries while maintaining light transmission through the openings.
Solution Approach 2:
The partition layer acts as an intermediary structure that provides attachment functionality while allowing light transmission. Instead of using a dark adhesive layer that blocks light, the partition layer with light-transmitting openings serves as a mediator between the electrophoretic layer and element array substrate, enabling both attachment and light transmission.
2Device complexity
If pixel electrodes are not aligned with microcapsules, then the manufacturing complexity is reduced, but the light transmission is blocked due to adhesive layer requirements
Solution Approach 1:
The patent segments the attachment function into discrete partition walls rather than requiring a continuous adhesive layer. The partition layer is divided into multiple partition walls that attach the electrophoretic layer at specific locations, allowing light transmission through the openings between partition walls and eliminating the need for precise electrode-microcapsule alignment.
3Reliability
If a continuous adhesive layer is used to ensure uniform attachment, then the attachment reliability is improved, but the light transmission and aperture ratio are reduced
Solution Approach 1:
The patent applies attachment functionality locally at the partition walls rather than uniformly across the entire surface. The partition layer provides reliable attachment at the boundaries where partition walls are formed, while the opening regions maintain high light transmission and aperture ratio without requiring adhesive material.
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 device achieves light transmission while maintaining display functionality, with controlled electrophoretic particle distribution for reflective or transmissive states, enhancing applicability to various display applications.
Implementation Method 1
an electrophoretic layer, disposed in the openings
Data Source
AI summary
A transmissive electrophoretic display device and a manufacturing method thereof. The transmissive electrophoretic display device has multiple pixel regions. Each pixel region has a light-transmitting region and a non-light-transmitting region. The transmissive electrophoretic display device includes an element array substrate, a partition layer, an electrophoretic layer, and a light-transmitting conductive substrate. The element array substrate includes multiple first control electrodes, respectively disposed in the light-transmitting regions, and multiple second control electrodes, respectively disposed in the non-light-transmitting regions. The partition layer is disposed on the element array substrate and has multiple openings. In a cross-sectional view, two adjacent partition walls in the partition layer are respectively disposed on opposite sides of a corresponding first control electrode. The electrophoretic layer is disposed in the openings. The light-transmitting conductive substrate covers the partition layer and the electrophoretic layer.