Diffusive Emissive Display for Pen Input Detection
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Solution Overview
Problem
Existing digital input devices that translate pen motion into digital inputs face limitations with projective capacitive touch sensors, which offer limited functionality and can increase cost and thickness, while electrical sensors can negatively impact the display and product design.
Innovation Solution
The use of diffusive emissive elements arranged in a predetermined pattern on a medium layer that emit light in a diffuse manner in response to non-visible light, allowing for position-encoded input detection without affecting the visible display, using a transparent medium layer with near-IR diffusely emissive patterns that are substantially clear in the visible spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If projective capacitive touch sensors are used for input detection, then input functionality is provided, but device complexity and cost increase
Solution Approach 1:
The patent extracts the input detection functionality from complex electronic sensor systems and implements it through a simplified optical encoding approach using diffusive emissive elements arranged in predetermined patterns that can be detected by a camera, thereby reducing device complexity while maintaining input functionality
Solution Approach 2:
The patent replaces the mechanical/electrical sensor system with an optical system that uses light-emitting elements and camera detection, substituting complex electronic sensing mechanisms with a simpler optical field-based detection method
2Adaptability or versatility
If electrical sensors are added to the display, then input detection capability is improved, but display thickness and product thickness increase
Solution Approach 1:
The patent substitutes electrical sensors with an optical detection system that uses diffusive emissive elements and camera-based detection, eliminating the need for thick electrical sensor layers and associated electronics, thereby maintaining display thickness
3Adaptability or versatility
If electrical sensors are integrated into the display, then input detection is enabled, but system cost increases
Solution Approach 1:
The patent uses inexpensive diffusive emissive elements that can be printed or applied as a layer on the display surface, replacing costly electrical sensor arrays with a low-cost optical encoding solution that achieves the same input detection functionality
Solution Approach 2:
The patent extracts the sensing function from expensive electrical sensors and implements it through a combination of simple optical elements and existing camera technology, thereby reducing system cost
4Measurement precision
If a non-transparent input detection layer is added, then input detection accuracy is improved, but visible display quality deteriorates
Solution Approach 1:
The patent applies local quality by making the diffusive emissive elements transparent or translucent in the visible spectrum while maintaining their light-emitting properties in the infrared spectrum, allowing the input detection layer to be both functionally effective and visually transparent
Solution Approach 2:
The patent changes the optical parameters of the diffusive emissive elements to emit primarily in the infrared spectrum rather than visible light, allowing high-contrast pattern detection for input accuracy while maintaining visual display quality through transparency in the visible range
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 provides a high-fidelity visual display with enhanced input accuracy and image quality, maintaining transparency and reducing system costs by using a low-cost, printable solution that effectively captures position-encoded data from a digital pen, improving signal-to-noise ratio and contrast.
Implementation Method 1
diffusive emissive elements arranged in a predetermined pattern on a medium layer that emit light in a diffuse, or scattered, manner in response to non-visible incident light
Implementation Method 2
WO2012/102690 discloses a filter which includes a pattern which may reflect or fluoresce non-visible light
Implementation Method 3
The diffusive emissive elements and the medium layer are substantively optically transparent to visible light generated from the display stack
Data Source
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AI summary
A display includes a display stack to generate a digital display image. A media layer includes a plurality of diffusive emissive elements disposed in a predetermined pattern. The diffusive emissive elements on the media layer emit a scattered signal in response to light incident to the media layer.