Sub-Pixel LED Touch Electrode Layout for Sensitive Display Input
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Solution Overview
Problem
Current display devices that integrate LEDs and touch functions face challenges in efficiently combining light-emitting diodes (LEDs) with touch sensors in a compact and effective manner, particularly in maintaining touch sensitivity and light emission performance.
Innovation Solution
The integration of a display device with sub-pixel areas featuring a light-emitting diode (LED) and a touch sensor electrode, where the LED and touch sensor are arranged in adjacent areas separated by a bank, with a filling layer embedding the LED and touch sensor wiring, allowing for mutual-capacitance or self-capacitance sensing methods, and the inclusion of a force sensing electrode for detecting Z-axis pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch sensor electrodes are integrated with LED display structures, then touch functionality is enabled, but device complexity increases
Solution Approach 1:
The patent combines LED display structures with touch sensor electrodes into a single integrated device. The LED display and touch sensor are merged such that the display substrate serves dual purposes: displaying visual information and detecting touch inputs, thereby enabling touch functionality while managing integration complexity through unified design
Solution Approach 2:
The display substrate is designed to perform multiple functions simultaneously: it serves as both the LED display structure and the touch sensor electrode substrate. This multi-functionality allows the same structural elements to contribute to both visual display and touch detection, reducing the need for separate dedicated components
2Adaptability or versatility
If multiple layers are used for LED and touch sensor electrodes, then functional integration is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the device into distinct functional layers: an LED display layer and a touch sensor electrode layer. Each layer is optimized for its specific function, allowing independent design and manufacturing processes for each layer before integration, thereby managing manufacturing complexity through structured segmentation
Solution Approach 2:
The patent resolves layer integration challenges by transitioning to a planar configuration where LED structures and touch sensor electrodes are arranged in the same plane or closely integrated layers. This dimensional arrangement simplifies the manufacturing process by reducing the need for complex multi-layer stacking and alignment procedures
3Manufacturing precision
If sub-pixel areas are separated by banks, then display quality is improved, but touch sensor electrode area is reduced
Solution Approach 1:
The patent applies different structural characteristics to different regions: banks with specific patterns are used in areas where display quality is prioritized, while regions with reduced banking or different electrode configurations are used where touch sensor area is prioritized. This local differentiation optimizes both display quality and touch sensitivity in their respective zones
Solution Approach 2:
The patent employs asymmetric bank designs where the banking structure varies in density, height, or pattern across different regions of the display. This asymmetry allows optimization of display quality in certain areas while preserving sufficient touch sensor electrode area in other areas, balancing the competing requirements
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 enhances touch sensitivity and light emission performance by allowing for precise capacitance changes detection across multiple axes, improving the overall user interaction and display quality.
Implementation Method 1
the touch sensor electrode may include an electrode operating in a self-capacitance method and sense a capacitance change of a single touch electrode, and touch sensor wirings may respectively and electrically connected to the touch sensor electrode and reciprocally exchange electrical signals of the touch sensor electrodes with an external device
Data Source
AI summary
A display device includes a display substrate in which a plurality of sub-pixel areas is defined, a light-emitting diode (“LED”) on the display substrate, a touch sensor electrode on the display substrate and including at least one touch electrode, and a bank separating the plurality of the sub-pixel areas, where each of the plurality of the sub-pixel areas may include a first area in which the LED is disposed and a second area in which the touch sensor electrode is disposed.