Sensor Matrix Positioning Over Black Matrix in Light Emitting Displays
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Solution Overview
Problem
Integrating touch sensing devices with light-emitting display devices poses a challenge as touch sensitivity is enhanced when touch sensing devices are placed on top, requiring them to be transparent, which limits light emission from the light-emitting devices.
Innovation Solution
A design where the sensor matrix is positioned over a black matrix surrounding the light-emitting picture elements, ensuring the sensor elements do not occlude the picture elements, with a lower definition than the picture elements to maintain transparency and enhance optical definition while maintaining compatibility with user input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch sensing devices are placed on top of light emitting devices, then touch sensitivity is enhanced, but light emission is limited due to required transparency
Solution Approach 1:
The patent resolves the contradiction by changing the spatial arrangement from vertical stacking (sensor over pixel) to horizontal integration (sensor alongside pixel within same matrix structure). The sensor matrix and display matrix are integrated at the same plane, allowing both functions to coexist without one blocking the other.
Solution Approach 2:
The patent merges the sensor matrix and display matrix into a single integrated structure where sensor elements and picture elements share the same substrate and wiring infrastructure. This combination allows both touch sensing and light emission to function simultaneously without compromising either performance.
2Illumination intensity
If light emitting devices are placed on top, then light emission is optimized, but touch sensitivity is reduced
Solution Approach 1:
Instead of vertical stacking that forces one component to block the other, the patent uses horizontal integration where sensors and light-emitting elements are positioned side-by-side within the same matrix plane, eliminating the blocking relationship entirely.
Solution Approach 2:
The integrated matrix structure serves dual functions simultaneously - the same physical structure enables both high-quality light emission for display and precise touch sensing, with each element type optimized for its specific function while sharing common infrastructure.
3Measurement precision
If sensor matrix has higher definition, then touch precision is improved, but transparency is reduced
Solution Approach 1:
The patent applies different definition requirements to different functional areas - the display matrix operates at high definition for visual quality, while the sensor matrix operates at lower definition appropriate for touch detection. Each matrix is optimized locally for its specific function rather than forcing uniform high definition across both.
Data Source
AI summary
Pressure sensitive sensors are integrated with light emitting picture elements (111 to 120). Light-emitting picture elements (111 to 120) are arranged upon a substrate (151), such that located light-emitting picture elements are surrounded by a black matrix (122) of non-light-emitting regions. A sensor matrix of pressure sensitive sensor elements (131 to 139) is located at regions of the black matrix, such that sensor elements are aligned at positions over the black matrix and do not occlude the light-emitting picture elements.