Pixel-aligned micro-wire electrodes for touch display resolution
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Solution Overview
Problem
Current touch-screen electrodes in display devices suffer from limited conductivity and transparency, leading to inadequate power supply to pixel elements and visual interference, particularly in large displays where the resolution of touch screens is lower than that of display devices, causing usability issues.
Innovation Solution
The solution involves a display apparatus with a touch-screen system where row and column electrodes are formed exclusively over all pixels in a corresponding row or column, utilizing micro-wires that are partially transparent to enhance conductivity and contrast, ensuring each pixel corresponds to a single electrode, thereby improving interactive resolution and usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transparent conductive electrodes are used in touch screens, then transparency is maintained, but conductivity is limited and power supply to pixel elements is inadequate
Solution Approach 1:
The electrode is divided into multiple discrete micro-wires arranged in a grid pattern rather than using a continuous transparent conductive layer. This segmentation allows individual micro-wires to be optimized for conductivity while the gaps between them maintain transparency, resolving the contradiction between these two properties.
Solution Approach 2:
The electrode structure combines metallic micro-wires (for conductivity) with transparent spacing materials (for transparency), creating a composite structure that achieves both high conductivity and high transparency simultaneously, rather than relying on a single material that must compromise between these properties.
2Power
If micro-wires are used to enhance conductivity, then power supply improves, but visual interference and reduced transparency may occur
Solution Approach 1:
The micro-wires are positioned specifically in the inter-pixel regions rather than uniformly across the entire display area. This local positioning ensures that conductivity is enhanced where needed while the pixel areas maintain full transparency and visual quality, avoiding visual interference from the micro-wires.
Solution Approach 2:
The electrode structure transitions from a two-dimensional continuous layer to a three-dimensional grid of micro-wires with vertical spacing. This dimensional change allows light to pass through the gaps between micro-wires, maintaining transparency while the micro-wires themselves provide the necessary conductivity pathways.
3Ease of manufacture
If touch-screen resolution is lower than display resolution, then manufacturing is easier, but interactive precision and usability deteriorate
Solution Approach 1:
The micro-wire electrode grid is pre-aligned with the pixel array during manufacturing, establishing a precise correspondence between touch locations and pixel elements before the device is used. This preliminary alignment ensures that even with lower touch-screen resolution, the interaction precision is maximized by matching electrode positions to pixel positions.
Solution Approach 2:
The patent replaces mechanical alignment methods with optical or electromagnetic field-based alignment, where the micro-wire positions are determined by field distribution patterns that naturally correspond to pixel arrangements. This substitution enables higher precision alignment without increasing mechanical manufacturing complexity.
Data Source
AI summary
A display apparatus includes a display including an array of pixels formed in rows and columns. A touch-screen including a transparent dielectric layer having a row side and an opposed column side is located over the display. An array of row electrodes are formed on the row side and an array of column electrodes are formed on the column side. Each of the row and column electrodes extends exclusively over all of the pixels in a corresponding row or column.