In-Cell Touch Display With Electrically Isolated Opposing Electrodes
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Solution Overview
Problem
Existing display devices with integrated touch panels face challenges in achieving electrical independence between touch electrodes, which affects the accuracy and reliability of touch sensing and can complicate manufacturing processes.
Innovation Solution
The implementation of a display device structure featuring a plurality of pixel electrodes, an EL layer, and opposing electrodes with a structural member and insulating film configuration, where the opposing electrodes are electrically separated by the structural member and insulating film, allowing for independent operation and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch panel is integrated over the display device screen, then touch sensing functionality is achieved, but electrical independence between touch electrodes deteriorates
Solution Approach 1:
The opposing electrode is divided into multiple independent electrode regions corresponding to different pixels. Insulating films and structural members are introduced between adjacent electrode regions to electrically separate them, enabling independent touch sensing for each pixel while maintaining the integrated touch panel structure
Solution Approach 2:
Insulating films and structural members are introduced as intermediary elements between adjacent opposing electrodes. These intermediaries provide electrical isolation while allowing the touch panel to maintain its integrated structure over the display device, thus achieving both touch functionality and electrode independence
2Reliability
If opposing electrodes are electrically separated by structural members and insulating films, then electrical independence is improved, but device structure becomes more complex
Solution Approach 1:
The insulating films serve dual purposes: they provide electrical isolation between adjacent opposing electrodes and simultaneously function as part of the touch panel structure. This merging of isolation and structural functions reduces the need for additional separate components, thereby limiting the increase in device complexity
Solution Approach 2:
The structural members and insulating films are designed to perform multiple functions: electrical isolation between electrodes, structural support for the touch panel, and definition of electrode boundaries. This multi-functionality reduces the overall component count and simplifies the device structure despite the need for electrical separation
3Reliability
If insulating films are used to separate pixel electrodes, then electrical isolation is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The insulating films are formed as part of the pixel electrode structure before the opposing electrodes are created. This preliminary formation of insulating layers simplifies subsequent manufacturing steps and reduces the precision requirements for later film placement, as the isolation structure is already in place to guide subsequent deposition processes
Data Source
AI summary
Disclosed is a display device including: a plurality of pixel electrodes; a plurality of opposing electrodes located over the plurality of pixel electrodes and arranged in a stripe shape; and an EL layer sandwiched between the plurality of pixel electrodes and the plurality of opposing electrodes. The plurality of opposing electrodes is electrically independent from one another. Each of the opposing electrodes may be electrically independent from the plurality of metal films. The plurality of metal films may be electrically floating.