Electrophoretic Display Partition Member Protrusion Design
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Solution Overview
Problem
The existing electrophoretic display technologies face issues with residue formation during the imprint method, leading to insufficient voltage application and reduced reliability due to the complexity and damage caused by dry etching in removing residual portions.
Innovation Solution
The electrophoretic display incorporates a partition member with protrusions on its bottom portions, allowing for sufficient voltage application and preventing obstruction of electrophoretic particle movement by positioning the protrusions away from the partition walls, ensuring effective electric field application and high display reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the imprint method is used to form the partition member, then the manufacturing process is simplified, but residue is formed on the bottom face of the partition member which prevents sufficient voltage application and reduces reliability
Solution Approach 1:
The invention extracts and removes the harmful residue from the bottom face of the partition member through a selective etching process. The etching solution specifically targets and removes the residue material without damaging the partition member structure, thereby eliminating the voltage application barrier while maintaining the simplicity of the imprint method.
Solution Approach 2:
The invention introduces an etching solution as an intermediary substance that selectively removes the residue. This intermediary enables the transition from a state with residue (poor voltage application) to a state without residue (sufficient voltage application) without requiring complex vacuum dry etching equipment.
2Reliability
If dry etching is used to remove the residual portion, then the residue is removed, but the process becomes complicated and the partition member is damaged
Solution Approach 1:
The invention replaces the complex vacuum-based mechanical dry etching system with a simple chemical etching process using a liquid or gel etching solution. This substitution eliminates the need for vacuum equipment and complex process control while achieving effective residue removal and protecting the partition member from damage.
Solution Approach 2:
The invention changes the etching process parameters from vacuum-based physical etching to chemical etching in liquid/gel medium. This parameter change allows for selective removal of residue at controlled rates, preventing damage to the partition member while maintaining effectiveness in residue removal.
3Reliability
If the protrusion is disposed at the center of the bottom portion, then the electric field can pass over successfully, but the protrusion may obstruct electrophoretic particle movement if too large
Solution Approach 1:
The invention applies local quality by creating a protrusion with specific dimensional characteristics (30% or less of the pixel region width) at the center of the bottom portion. This localized structure allows the electric field to pass through effectively while minimizing obstruction to electrophoretic particle movement, as the protrusion occupies only a limited portion of the pixel region.
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 enables satisfactory display characteristics and high reliability by ensuring sufficient voltage application to the electro-optical layer, preventing particle obstruction, and reducing the complexity of the manufacturing process.
Implementation Method 1
an electrophoretic layer containing a dispersion medium and electrophoretic particles is disposed between electrodes formed on the inner sides of a pair of substrates. Such an electrophoretic display can display desired information by controlling, for example, the amplitude, polarity, waveform, application time, and frequency of the voltage applied between the electrodes.
Data Source
AI summary
An electrophoretic display includes an electrophoretic layer arranged in each pixel region partitioned by a partition member disposed between a first electrode and a second electrode that are arranged on the inner sides of a pair of substrates. The partition member has bottom portions laminated on the first electrode and partition walls joined to the bottom portions. The partition walls partition the pixel region. The bottom portions each have a protrusion.