Patterned Band-Pass Filter for Interactive Handwriting Display
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Solution Overview
Problem
Conventional touch screens face challenges such as high manufacturing costs, poor sensitivity, durability issues, and interference problems, particularly with resistive and capacitive touch screens, which hinder effective interactive handwriting operations and miniaturization.
Innovation Solution
An interactive handwriting display device incorporating a patterned band-pass filter component on a display panel, comprising a substrate with band-pass filter units that filter specific light wavelengths, allowing only certain wavelengths to pass, and an optical signal selector to capture and interpret the filtered light patterns, eliminating the need for electrical connections and simplifying manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional touch screens use ITO sensors with electrical connections to provide interactive operation function, then interactivity is achieved, but manufacturing cost increases and manufacturing complexity increases
Solution Approach 1:
The patent replaces the electrical sensing system (ITO sensors and electrical connections) with an optical sensing system using band-pass filter units that detect touch interactions through optical signal changes rather than electrical signals, thereby eliminating the need for complex electrical connections while maintaining interactive functionality
Solution Approach 2:
The patent uses optical patterns and light filtering to create a functional copy of the touch sensing capability without requiring physical electrical connections, where the band-pass filter units optically encode touch positions and interactions
2Ease of manufacture
If resistive touch screens are used to provide interactive function, then touch sensitivity is reduced, but manufacturing is simpler
Solution Approach 1:
The patent applies different optical properties to different regions by using multiple band-pass filter units with specific wavelength selections, where each filter unit is optimized for its local function in detecting touch interactions, thereby achieving high sensitivity without compromising manufacturing simplicity
3Measurement precision
If capacitive touch screens are used to provide interactive function, then electrical signal accuracy is improved, but susceptibility to electromagnetic interference increases
Solution Approach 1:
The patent substitutes electrical signal detection with optical signal detection using band-pass filters, where touch interactions are detected through changes in optical transmission rather than electrical capacitance changes, thereby eliminating susceptibility to electromagnetic interference while maintaining signal accuracy
4Measurement precision
If optical touch screens are used to provide interactive function, then signal transmission is improved, but signal shielding problems occur during two-handed operation
Solution Approach 1:
The patent uses multiple band-pass filter units with different wavelength selections distributed across the screen, where each filter unit operates independently at its optimal wavelength, allowing simultaneous detection of multiple touch points without mutual interference or signal shielding
5Measurement precision
If band-pass filter units are used to filter specific light wavelengths, then optical signal precision is improved, but device complexity increases
Solution Approach 1:
The patent achieves precise optical signal detection by varying the wavelength parameters of multiple band-pass filter units, where each filter is tuned to a specific wavelength range to detect different aspects of touch interactions, thereby achieving high precision through parameter differentiation rather than structural 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
The solution provides a cost-effective, sensitive, and accurate interactive handwriting operation without the limitations of conventional touch screens, enabling integration into large-size displays and reducing environmental impact by simplifying the manufacturing process and reducing resource waste.
Implementation Method 1
a patterned band-pass filter component formed on the display panel. The patterned band-pass filter component comprises a substrate and multiple band-pass filter units
Data Source
AI summary
Provided are an interactive handwriting display device and an interactive handwriting capture device. The interactive handwriting display device has a display panel and a patterned band-pass filter component, and the patterned band-pass filter component has a substrate and multiple band-pass filter units. The interactive handwriting capture device includes an optical signal selector, an image-forming module, a photodetector chip and a microprocessor. By using the interactive handwriting display device with a patterned filtering function and the interactive handwriting capture device with the recognition function, the addressable ITO sensor's need of electrical connection is eliminated, providing interactive operating function and the writing function of high sensitivity and accuracy. Also, the manufacturing complexities are reduced and the integration of components is improved as the touch screens get larger in size.