Optical Touch Discrimination via Perimeter Beam Analysis
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Solution Overview
Problem
Current touch-sensitive technologies face challenges in scaling to larger screen sizes and effectively handling natural stylus interactions, leading to user frustration and increased costs due to the need for special processing and battery-powered active styluses.
Innovation Solution
An optical touch-sensitive device with emitters and detectors around the periphery that use multiplexed optical beams to determine touch event locations and characteristics, allowing for the identification of objects based on geometrical and optical features, enabling robust interaction with passive objects like pens and erasers without the need for active sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If special processing or special elements are added to the touch surface to improve stylus detection, then stylus interaction capability is improved, but manufacturing cost and complexity increase significantly
Solution Approach 1:
The patent replaces mechanical/specialized surface processing with an optical detection system. Instead of modifying the touch surface with special elements to detect stylus interactions, the system uses optical beams and sensors to detect the presence and characteristics of touch objects, substituting complex mechanical surface modifications with optical field-based detection.
Solution Approach 2:
The optical detection system serves multiple functions: it detects both finger touches and stylus interactions using the same basic infrastructure of emitters and detectors. The system can identify different touch object types (finger, passive stylus, active stylus) and measure multiple parameters (position, pressure, contact area) without requiring different surface processing for each function.
2Measurement precision
If active stylus with electromagnetic sensors are used to improve touch detection accuracy, then measurement precision is improved, but power consumption and device complexity increase
Solution Approach 1:
The system allows passive stylus to interact with the touch surface without requiring the stylus to provide its own power source or active signaling. The touch surface's optical infrastructure actively detects the passive stylus's presence and characteristics, making the detection process self-service oriented rather than requiring bilateral active participation.
Solution Approach 2:
The patent extracts the power consumption requirement from the stylus side and places it entirely on the touch surface side. By removing the need for electromagnetic sensors and batteries in the stylus, the system eliminates the moving object's energy requirement while maintaining detection capability through the stationary optical infrastructure.
3Adaptability or versatility
If electromagnetic sensors are added to improve stylus detection, then adaptability to stylus is improved, but manufacturing cost increases
Solution Approach 1:
The patent substitutes electromagnetic sensor technology with optical detection technology. Instead of using electromagnetic fields and sensors that require complex manufacturing and calibration, the system uses optical beams and detectors that can be more easily manufactured and integrated into the touch surface infrastructure.
4Area of stationary object
If the screen size is increased linearly by a factor of N, then display area is improved, but the number of special elements required increases by N2
Solution Approach 1:
The patent transitions from a two-dimensional array of special elements on the surface to a perimeter-based optical infrastructure. By placing emitters and detectors around the edges of the display rather than distributing them across the entire surface area, the system achieves scalability where the number of components increases linearly with perimeter length rather than quadratically with surface area.
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 scalable and cost-effective touch system that enhances user interaction by accurately identifying objects, reducing power consumption, and eliminating the need for battery-powered active styluses, thus improving the overall user experience and reducing costs.
Implementation Method 1
Touch events interact with optical beams that propagate from the emitters along the touch-sensitive surface to the detectors. The intensities of at least some of the beams are attenuated by a touch event on the touch-sensitive surface by an object.
Data Source
AI summary
A touch system includes a touch-sensitive surface with emitters and detectors arranged around its periphery. A touch event caused on an object interacts with optical beams that propagate from the emitters along the touch-sensitive surface to the detectors. Beam data indicating detected intensities of the optical beams is received. The touch system determines a set of measured interactions of the optical beams with the detected touch event from the beam data and compares the set of measured interactions with sets of model interactions of the optical beams for different candidate touch feature sets. Based on the comparison, the touch system selects one of the candidate touch features sets for the touch event. The touch system may also classify the touch event as having been caused by a particular object (or class of object) based on the selected touch feature set.