Electrophoretic Display Partition Wall Curvature and Antireflective Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The manufacturing process of electrophoretic displaying apparatuses often results in particles remaining on the upper surfaces of partition walls, leading to reduced contrast ratios due to unwanted particles being displayed between pixels.
Innovation Solution
The electrophoretic displaying apparatus features a design where the outer surface of the thin film transistor substrate serves as the display surface, with an antireflective layer formed between the scanning and data lines, and partition walls with convex curved surfaces to minimize particle accumulation on the upper surfaces, preventing the display of unwanted particles and reducing glare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If particles are dispersed in solvent and poured onto substrate before forming partition walls, then the manufacturing process is simple and efficient, but particles remain on upper surfaces of partition walls causing reduced contrast ratio
Solution Approach 1:
The patent applies preliminary action by forming the partition walls before pouring the solvent containing particles. This sequence prevents particles from accumulating on the upper surfaces of partition walls during the pouring process, thereby maintaining high contrast ratio while preserving manufacturing efficiency. The partition walls are formed by coating a resin composition on the substrate, creating defined regions that guide subsequent solvent filling without particle contamination.
2Ease of manufacture
If flat partition wall surfaces are used, then manufacturing is easier, but particles accumulate on upper surfaces reducing display quality
Solution Approach 1:
The patent applies curvature by forming the upper surfaces of partition walls with a convex curved shape instead of flat surfaces. This convex curvature prevents particles from accumulating on the upper surfaces during solvent pouring, as particles naturally roll off or are directed away from convex surfaces. The curved surfaces are formed through controlled drying or heating processes that shape the resin composition, eliminating particle accumulation issues while maintaining manufacturing feasibility.
3Reliability
If signal lines are formed on the substrate surface, then electrical connectivity is achieved, but glare occurs from direct light reflection off the lines
Solution Approach 1:
The patent applies the intermediary principle by introducing a resin composition layer between the signal lines and the external environment. This resin layer serves as a mediator that fills the spaces around signal lines and pixel electrodes, providing optical matching that reduces light reflection and glare. The resin composition has refractive index properties that minimize the visibility of underlying conductive structures, thereby eliminating glare while preserving electrical connectivity function.
Solution Approach 2:
The patent applies color changes by using a resin composition with specific optical properties that reduce light reflection. The resin can be formulated to have refractive index matching with the surrounding medium or to absorb specific wavelengths, effectively changing the optical appearance of the signal lines from reflective to non-reflective, thereby eliminating glare while maintaining electrical functionality.
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 effectively suppresses the lowering of contrast ratio and glare, ensuring improved visual quality by preventing unwanted particles from being displayed and maintaining consistent contrast across pixels.
Implementation Method 1
when the voltage of the opposed electrode 106 is heightened to be higher than those of the pixel electrodes 103, the white particles 109 move to the opposed electrode 106 side, and the black particles 108 move to the pixel electrodes 103 side
Data Source
AI summary
An electrophoretic displaying apparatus, comprises: a first substrate and a second substrate placed opposite with a predetermined interval; a plurality of pixel electrodes arranged on the first substrate; signal lines arranged between the adjoining pixel electrodes; an opposed electrode provided on the second substrate; partition walls provided to stand toward the second substrate over the signal lines of the first substrate so as to enclose the plurality of pixel electrodes; and solvents severally containing a plurality of particles dispersed therein to be filled up in regions enclosed by the partition walls, wherein antireflective layer is formed on the first substrate correspondingly to the partition walls, and the signal lines is formed on a layer between the partition walls and the antireflective layer.