Touch Electrode Code Patterns for Ambient-Light-Resistant Pen Input
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Solution Overview
Problem
Existing display devices face challenges in accurately detecting touch inputs, particularly when using electronic pens, due to interference from ambient light and the need for improved precision in sensing touch patterns.
Innovation Solution
The implementation of code patterns formed on touch electrodes in specific shapes, combined with light blocking layers, enhances the detection of touch inputs by reducing ambient light interference and improving recognition accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If code patterns are formed on touch electrodes to improve touch detection accuracy, then measurement precision is improved, but device complexity increases due to additional light blocking pattern layers and electrode structures
Solution Approach 1:
The patent combines the code pattern formation with the light blocking pattern layers, integrating multiple functions into a single structural element. The light blocking patterns serve both as optical shields and as code patterns for touch detection, reducing the need for separate components and simplifying the overall device structure while maintaining improved touch detection accuracy.
Solution Approach 2:
The light blocking pattern layers are designed to serve multiple functions: they block ambient light from interfering with touch detection and simultaneously form code patterns that enable precise touch input recognition. This multi-functional design allows the same structural element to address both light interference and touch detection precision requirements.
2Reliability
If light blocking pattern layers are added to reduce ambient light interference, then reliability of touch detection is improved, but manufacturing precision requirements increase due to precise pattern alignment needs
Solution Approach 1:
The code patterns are formed during the same manufacturing process as the light blocking pattern layers, specifically during the organic electrode formation step. This preliminary action ensures that the patterns are created simultaneously with proper alignment, eliminating the need for subsequent separate alignment operations and reducing manufacturing precision requirements.
Solution Approach 2:
The manufacturing process is designed so that the formation of light blocking patterns and code patterns occurs in the same process step, where the pattern alignment is inherently ensured by the process geometry. The system uses its own manufacturing process to automatically ensure proper alignment without requiring additional external alignment operations.
Data Source
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AI summary
A display device includes a display unit including a plurality of light emitting areas, a plurality of touch electrodes disposed between the plurality of light emitting areas to sense a touch, a plurality of light blocking pattern layers formed by covering intersection areas of driving electrodes and sensing electrodes among the plurality of touch electrodes, a plurality of connection electrodes formed on the plurality of light blocking pattern layers to electrically connect the driving electrodes or the sensing electrodes adjacent to each other, and a plurality of code patterns formed of the same material as the plurality of light blocking pattern layers through the same process.