Touchscreen Recessed Metal Layer Signal Delay Reduction
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Solution Overview
Problem
Current touchscreens face challenges in improving touch sensing functionality and display quality, particularly due to signal delay and light interference issues caused by the material characteristics of touch electrode layers in capacitive touch sensors.
Innovation Solution
The implementation of a touchscreen design featuring recesses on the encapsulating substrate with a lower metal layer and touch electrode layer, which reduces signal delay and minimizes light interference by blocking and guiding light effectively, using materials like Cu, Mo, and Ti for the lower metal layer and transparent oxide materials for the touch electrode layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a capacitive touch sensor uses a touch electrode layer with standard material characteristics, then the touchscreen can be manufactured with conventional processes, but signal delay occurs and touch sensing accuracy deteriorates
Solution Approach 1:
The patent changes the material parameters of the lower metal layer from conventional materials to specific materials (Cu, Mo, Ti) with optimized electrical conductivity and optical properties. This parameter change reduces signal delay while maintaining manufacturability, directly resolving the contradiction between touch sensing accuracy and signal delay
Solution Approach 2:
The patent employs a composite structure with a lower metal layer (Cu/Mo/Ti) combined with a transparent oxide touch electrode layer. This composite material approach allows simultaneous optimization of electrical performance (reduced signal delay) and optical performance (minimal light interference), resolving the contradiction between sensing accuracy and signal delay
2Measurement precision
If the touchscreen structure includes additional layers and recesses to improve touch sensing, then touch sensing accuracy improves, but light interference issues arise affecting display quality
Solution Approach 1:
The patent optimizes the optical parameters of the lower metal layer by selecting materials (Cu, Mo, Ti) with specific reflectivity and transparency characteristics. This allows the layer to block harmful light interference while maintaining touch sensing functionality, resolving the contradiction between improved sensing accuracy and reduced light interference
Solution Approach 2:
The patent applies different material properties to different regions: the lower metal layer provides electrical conductivity and light blocking in specific areas, while the transparent oxide layer provides touch sensing functionality with minimal light interference. This localized quality differentiation resolves the contradiction between touch sensing improvement and light interference reduction
3Ease of manufacture
If recesses are depressed from the encapsulating substrate to position the lower metal layer, then light interference is minimized and display quality improves, but manufacturing complexity increases
Solution Approach 1:
The patent segments the encapsulating substrate by creating recesses that separate the lower metal layer from the main substrate surface. This segmentation allows independent optimization of the metal layer position for light interference reduction while maintaining standard manufacturing processes for forming the recesses, resolving the contradiction between display quality improvement and manufacturing complexity
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 design enhances touch sensing accuracy and display quality by reducing signal delay and light interference, improving luminance and color viewing angles, and optimizing light emission efficiency.
Implementation Method 1
minimizes light interference by blocking and guiding light effectively
Implementation Method 2
detects touch input by sensing capacitance variation according to input of a touchscreen driving signal, that is, charge variation in the touch sensor
Data Source
AI summary
An electronic device having a touch sensor, the electronic device can include a display panel including an active area and an encapsulating substrate covering the active area; a plurality of recesses in a surface of the encapsulating substrate; and a touchscreen including a lower metal layer disposed in the plurality of recesses, and a touch electrode layer electrically connected to a part of the lower metal layer and including touch driving electrodes and touch sensing electrodes separately arranged on the encapsulating substrate.