Electrophoretic Display Watermark Area via Local Quality
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Solution Overview
Problem
Existing display devices lack effective counterfeiting protection and decorative features, as they do not have a distinct watermark area that can be differentiated from the non-watermark area without compromising image quality.
Innovation Solution
The display device incorporates modulated display cells in the watermark area by varying parameters such as wall width, thickness, height, shape, and size compared to the non-watermark area, which are designed to be distinguishable only at certain viewing angles or lighting conditions, using microcup technology and electrophoretic display principles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If display cells are made uniform across the entire display surface, then manufacturing is simplified and image quality is consistent, but counterfeiting protection and decorative features are lost
Solution Approach 1:
The patent applies local quality by creating a watermark area with display cells that have different characteristics (different wall thicknesses, different sizes, or different shapes) from the non-watermark area cells. This allows the display device to have uniform appearance during normal operation while containing distinguishable features in specific regions for counterfeiting protection, thus resolving the contradiction between maintaining simplicity and adding protection features.
2Reliability
If watermark features are made clearly distinguishable, then counterfeiting protection is enhanced, but image quality and viewing experience are compromised
Solution Approach 1:
The patent employs dynamics by making the watermark distinguishable only under specific viewing conditions (certain angles or lighting conditions) rather than being constantly visible. The display cells in the watermark area can be made distinguishable through parameters like wall thickness, size, or shape differences that become apparent only when viewed from specific perspectives, thus maintaining image quality during normal viewing while providing protection when needed.
3Reliability
If display cell parameters are varied in the watermark area, then watermark distinguishability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by implementing parameter variations (wall thickness, size, shape) only in the watermark area while keeping the non-watermark area cells uniform. This localized approach allows the watermark to be distinguishable without requiring complex manufacturing processes for the entire display, as the variations are confined to specific regions and can be integrated into existing manufacturing workflows.
Data Source
AI summary
The present invention is directed to display devices comprising a watermark area and a non-watermark area. The display cells in the watermark area have widths of the partition walls, heights of the partition walls, top opening shapes or display cell sizes which are different from those of the display cells in the non-watermark area. The watermark aims to protect against counterfeiting or to be used for decoration purposes. The watermark is visible at certain viewing angles and/or under certain lighting conditions and it does not interfere with displaying of the regular images.