Electrophoretic Display Same-Side Substrate Shadow Elimination
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Solution Overview
Problem
The existing double-layer structure of electrophoretic displays, where the driving circuit layer is not flat, results in stress concentration areas leading to shadow display issues due to the operation based on electric fields.
Innovation Solution
An electrophoretic display with an electrophoretic panel and a conductive layer deposited on the same side of a substrate, utilizing a background signal and a foreground signal where the background signal is longer than the foreground signal's display period, and maintaining the foreground signal's voltage at the common voltage of the panel after display completion, to eliminate shadows and simplify processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the driving circuit layer is not processed by a special plane process, then the manufacturing process is simpler, but the electrophoretic panel develops stress concentration areas causing shadow display issues
Solution Approach 1:
The invention separates the driving circuit layer from the electrophoretic panel layer, allowing each to be optimized independently. The driving circuit can be processed without plane treatment while the electrophoretic panel maintains flatness through its own structure, eliminating the conflict between manufacturing simplicity and display quality.
Solution Approach 2:
The invention introduces an intermediary structure (the substrate with specifically designed layer deposition) between the driving circuit and electrophoretic panel. This intermediary allows the driving circuit to remain non-planar while preventing stress transmission to the electrophoretic panel, thus avoiding shadow display issues without requiring complex plane processing.
2Ease of manufacture
If the electrophoretic panel and conductive layer are deposited on the same side of the substrate, then the processing is simpler, but the structure becomes more complex
Solution Approach 1:
The invention merges the deposition process of the electrophoretic panel and conductive layer onto the same side of the substrate, simplifying the manufacturing process. Although this creates a more complex structure, the complexity is managed through integrated design where the conductive layer serves dual functions in the unified structure.
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 design eliminates shadow display issues and simplifies the processing of electrophoretic panels by ensuring the electrophoretic panel and conductive layer are on the same substrate, enhancing display quality and manufacturing efficiency.
Implementation Method 1
an electrophoretic panel for displaying images... operation of an electrophoretic panel is based on electric field... a plurality of charged particles
Data Source
AI summary
An electrophoretic display includes an electrophoretic panel, a substrate, and a processor. The electrophoretic panel includes a plurality of charged particles. A conductive layer is deposed on the substrate, and the conductive layer is coupled to the electrophoretic panel. The processor is coupled to the conductive layer for generating a background signal to drive the plurality of charged particles to display a background and a foreground signal to drive the plurality of charged particles to display a foreground. The background signal is longer than a period for the foreground signal displaying the foreground.