Touch Sensor Panel Light Shielding for Ambient Interference
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Solution Overview
Problem
Ambient light interference affects sensitive touch sensor panel circuitry, leading to display artifacts and performance disruptions, and existing solutions are impractical due to micro-scale size and manufacturing complexity.
Innovation Solution
A touch sensor panel design with a first layer of opaque material having openings and multiple metal layers configured to block light from reaching sensitive circuitry while allowing light to reach photodetectors, using metal routing traces to manage light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a layer of opaque material is added to shield micro-driver circuitry from ambient light, then light interference is reduced, but display artifacts occur due to irregular shielding patterns
Solution Approach 1:
The patent applies local quality by making the opaque layer selectively transparent - it remains opaque in most regions to block ambient light from micro-driver circuitry, but creates specific transparent openings aligned with photodetectors to allow light transmission. This localized modification of optical properties resolves the contradiction by protecting sensitive circuitry while enabling photodetector function without creating display artifacts.
2Illumination intensity
If openings are created in the opaque layer to allow light to photodetectors, then optical sensing is enabled, but ambient light reaches sensitive circuitry causing interference
Solution Approach 1:
The patent segments the panel into distinct functional regions: a first region containing the opaque layer with openings for photodetectors, and a second region containing the micro-driver circuitry. The opaque layer acts as a segmentation barrier that divides light paths, allowing light to reach photodetectors through controlled openings while blocking ambient light from reaching sensitive circuitry in the second region.
3Object-affected harmful factors
If the opaque layer covers the entire panel to block light, then circuit protection is maximized, but photodetectors cannot receive light for sensing
Solution Approach 1:
The patent extracts openings from the otherwise continuous opaque layer at specific locations where photodetectors are positioned. This extraction creates light transmission pathways precisely where needed for optical sensing, while the remaining opaque material continues to provide comprehensive protection to sensitive circuitry across the panel.
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
The solution effectively shields sensitive circuitry from ambient light interference while enabling photodetectors to function, preventing display artifacts and improving optical performance.
Implementation Method 1
A first layer of opaque material in a micro-driver region corresponding to a chiplet micro-driver and a photodetector region corresponding to a photodetector can include a plurality of openings in the micro-driver region and the photodetector region
Implementation Method 2
A touch sensor panel can include ambient light sensors that include photodetectors. Ambient light sensing circuitry is coupled to the photodetectors to measure ambient light incident on the panel
Data Source
AI summary
A touch sensor panel can include a micro-driver region corresponding to a chiplet micro-driver and a photodetector region corresponding to a photodetector. A first layer of opaque material in the micro-driver region and the photodetector region can include a plurality of openings in the micro-driver region and the photodetector region. The plurality of openings can include a first opening in the micro-driver region opposite the chiplet micro-driver and a second opening in the photodetector region opposite the photodetector. The touch sensor panel can include a plurality of metal layers between the first layer of opaque material and the chiplet micro-driver and the photodetector. One or more first portions of one or more of the plurality of metal layers can be disposed opposite the first opening and be configured to at least partially block light entering the first opening from being incident on the chiplet micro-driver.