In-Cell Touch Sensing in Micro-LED Displays via Shared Electrodes
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Solution Overview
Problem
Current display apparatuses with touch sensing functions face challenges in integrating touch sensing modules effectively with micro-LED or mini-LED displays, particularly in achieving high resolution for pressing force sensing without compromising display functionality or increasing manufacturing complexity.
Innovation Solution
The integration of an array substrate with light emitting diodes (LEDs), control devices, and an electrode pattern that includes touch driving signal lines and electrodes functioning as both display and touch sensing elements, allowing for in-cell touch sensing and sub-pixel level touch sensing units without a bridge structure between electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch sensing module is integrated with micro-LED or mini-LED display, then touch sensing function is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the touch sensing module with the micro-LED display by integrating touch sensing electrodes and driving signal lines directly into the display structure. The first electrodes connect to first semiconductor layers and the second electrodes connect to second semiconductor layers, creating an integrated in-cell touch sensing solution that eliminates separate touch module assembly
Solution Approach 2:
The electrode pattern serves dual functions: it acts as both display control electrodes for the micro-LEDs and as touch sensing electrodes for detecting touch positions. The same electrode structure is used for both driving the display and sensing touch input, reducing the need for separate dedicated touch sensing components
2Measurement precision
If touch sensing units are scaled down to sub-pixel level, then resolution for pressing force sensing is improved, but device complexity increases
Solution Approach 1:
The display is divided into multiple sub-pixel regions, each containing micro-LEDs of different colors (red, green, blue). Each sub-pixel region has its own touch sensing capability through the electrode pattern, enabling high-resolution touch sensing at the sub-pixel level. The first and second electrodes are selectively arranged in different sub-pixel regions to achieve this segmentation
Solution Approach 2:
The patent extends touch sensing capability from traditional pixel level to sub-pixel level by utilizing the spatial arrangement of first and second electrodes within individual sub-pixels. This dimensional refinement allows detection of touch positions with precision finer than the pixel grid, achieving sub-pixel level resolution
3Device complexity
If in-cell touch sensing is implemented without bridge structure, then manufacturing complexity is reduced, but touch sensing electrode connectivity becomes challenging
Solution Approach 1:
The first electrodes and second electrodes are designed to be self-connected through the LED structure itself. The first electrodes connect to first semiconductor layers and the second electrodes connect to second semiconductor layers, using the LED junction as the connection point. This eliminates the need for separate bridge structures to connect touch sensing electrodes across the display
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables improved resolution for pressing force sensing while maintaining display functionality and avoiding complexity in manufacturing, with touch sensing units scaled down to a sub-pixel level and capacitance-based detection of touch positions.
Implementation Method 1
The plurality of LEDs respectively comprise a first semiconductor layer, a second semiconductor layer and a light emitting layer. The light emitting layer is disposed between the first and second semiconductor layers.
Implementation Method 2
with capacitance-based detection of touch positions
Data Source
AI summary
A display apparatus is provided. The display apparatus includes an array substrate, and includes control devices, light emitting diodes (LEDs) and an electrode pattern disposed on the array substrate. The LED includes first and second semiconductor layers, and includes a light emitting layer disposed between the first and second semiconductor layers. The electrode pattern includes first electrodes, second electrodes and touch driving signal lines. Each first electrode is electrically connected with the first semiconductor layer of at least one of the LEDs. Each second electrode is electrically connected with the second semiconductor layer of one of the LEDs and one of the control devices. The touch driving signal lines are respectively disposed between adjacent first electrodes. At least an edge of each first electrode is adjacent to a line section of the touch driving signal lines.