Touch Sensor Destructive Interference Anti-Reflection
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Solution Overview
Problem
Conventional display devices face challenges in reducing ambient light reflection without increasing thickness, which affects visibility and contrast, especially when using circular polarizing plates that add multiple layers and bulk to the device.
Innovation Solution
A touch sensing structure is implemented with a destructive interference portion comprising alternately stacked dielectric and metal layers, which reduces ambient light reflection by causing destructive interference, eliminating the need for a separate circular polarizing plate and allowing for thinner display devices with integrated touch sensing functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a circular polarizing plate is used to reduce ambient light reflection, then visibility is improved, but device thickness increases
Solution Approach 1:
The patent combines the anti-reflection function with the touch sensor electrode structure by forming metal patterns directly as the lower electrode of the touch sensor. This integration eliminates the need for separate circular polarizing plates while achieving both touch sensing and ambient light reflection reduction functions within the same structural layer.
Solution Approach 2:
The metal patterns in the touch sensor serve dual purposes: they function as electrical conductors for touch detection and simultaneously act as reflective layers to reduce ambient light reflection. This multi-functionality allows the device to achieve visibility improvement without adding dedicated anti-reflection components that would increase thickness.
2Illumination intensity
If multiple layers are added to reduce ambient light reflection, then visibility is improved, but device complexity increases
Solution Approach 1:
The patent merges the anti-reflection layer with the touch sensor electrode structure. The metal patterns that form the lower electrode of the capacitive touch sensor simultaneously serve as the reflective layer, eliminating the need for separate anti-reflection layers and reducing overall device complexity.
Solution Approach 2:
The same metal pattern layer performs multiple functions: electrical conduction for touch sensing, structural support, and optical reflection control. This multi-functionality reduces the total number of layers required while maintaining visibility improvement.
3Object-affected harmful factors
If a separate anti-reflection structure is added, then ambient light reflection is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent combines the anti-reflection structure with the touch sensor manufacturing process. The metal patterns are formed using the same sputtering or evaporation processes already used for creating the touch sensor electrodes, eliminating the need for separate anti-reflection layer deposition processes and simplifying manufacturing.
Solution Approach 2:
The metal patterns serve dual purposes as touch sensor electrodes and anti-reflection layers, allowing a single manufacturing process to achieve both functions simultaneously without requiring additional fabrication steps.
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 solution effectively reduces ambient light reflection, enhances visibility, and minimizes the overall thickness of the display device by utilizing the destructive interference effect of dielectric and metal layers, while maintaining touch sensing capabilities.
Implementation Method 1
A touch sensing structure is implemented with a destructive interference portion comprising alternately stacked dielectric and metal layers, which reduces ambient light reflection by causing destructive interference
Data Source
AI summary
A touch sensing structure and display device including the same are disclosed. In one aspect, the display device includes a display panel including a light-emitting region and a non-light-emitting region and a touch sensor formed over the display panel and including a plurality of sensing patterns. The display device also includes a destructive interference unit formed over the display panel and overlapping the touch sensor. The destructive interference unit includes a plurality of dielectric layers and a plurality of metal layers that are alternately stacked. At least one of the metal layers includes a plurality of metal patterns that are separated from each other.