Patterned Optical Layer for High-Resolution Touch Sensing
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Solution Overview
Problem
Conventional touch panels for large displays are costly and suffer from poor resolution and susceptibility to interference, necessitating a solution that is both cost-effective and high-resolution.
Innovation Solution
A display device with a patterned optical material layer sensitive to infrared or ultraviolet light, which selectively reflects or absorbs invisible light, allowing a light sensor to detect specific patterns and positions, thereby enabling accurate light sensing and positional recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional capacitive or resistive touch panels are used for large displays, then the display size can be achieved, but the cost increases and resolution deteriorates
Solution Approach 1:
The patent replaces conventional capacitive or resistive touch panel mechanisms with an optical sensing system. A pattern layer with specific optical properties (reflective, absorptive, or transmissive) is implemented on the display, and a light sensor detects patterns formed by invisible light (IR or UV) to determine touch positions. This optical substitution achieves high resolution and low cost for large displays.
2Ease of operation
If conventional touch technologies are used, then basic touch functionality is achieved, but susceptibility to interference increases
Solution Approach 1:
The pattern layer is designed with spatially varying optical properties, creating distinct local characteristics (reflective, absorptive, or transmissive regions) that form unique patterns. The light sensor detects these localized pattern variations to determine touch positions, making the system resistant to interference as each position has a distinct optical signature.
3Measurement precision
If a pattern layer with optical material is implemented, then light sensing capability is improved, but device complexity increases
Solution Approach 1:
The patent utilizes changes in optical parameters (reflectivity, absorptivity, transmittance) of the pattern layer material to encode positional information. By varying these optical parameters across different regions of the pattern layer, the system achieves high light sensing capability while maintaining relatively simple structure, as the information is encoded in the material properties rather than complex mechanical or electronic components.
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 provides a cost-effective and high-resolution light sensing system that accurately determines positions and enables specific functions by utilizing the patterned optical material layer to emit and sense invisible light, enhancing the resolution and functionality of touch panels.
Implementation Method 1
The optical material of the pattern layer can selectively reflect or absorb invisible light of specific wavelength emitted from the display module
Implementation Method 2
The optical material of the pattern layer can selectively reflect or absorb invisible light of specific wavelength emitted from the display module
Implementation Method 3
a light sensor placed above the viewing surface of the display module will sense a reduced amount of the invisible light emitted from the display module through the optical material
Data Source
AI summary
A display device is applied to a light sensing system. The display device includes a display module and a pattern layer. The pattern layer is made of optical material capable of either fully or partially reflecting or absorbing invisible light of specific wavelength emitted from the display module, and is formatted on the display module, thus defining gaps through which invisible light can pass. A light sensor is utilized to sense the pre-determined pattern defined by the invisible light passing through the pattern layer. Based on the light sensing result, the light sensor can recognize the corresponding pattern. The optical material of the pattern layer may be arranged to incorporate locational varying invisible light transmittance to define the pre-determined pattern at a finer degree, thus further increasing sensing accuracy.