Touch Pen Positioning via Sound Wave and Electromagnetic Signals
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Solution Overview
Problem
Current capacitive touch screens suffer from low accuracy due to insufficient report rates and pseudo point issues, and they cannot support simultaneous operations of multiple active pens, limiting their convenience and applications.
Innovation Solution
A display screen equipped with sound wave detectors and a controller that uses distinct frequency bands for multiple touch pens to accurately determine their positions by combining electromagnetic and sound wave signals, allowing for simultaneous multipoint positioning and pressure sensing without electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If capacitive touch screens are used for touch control, then ease of operation is improved, but positioning accuracy deteriorates due to pseudo points and insufficient report rates
Solution Approach 1:
The patent introduces sound wave signals as an intermediary mechanism to resolve the contradiction between ease of operation and positioning accuracy. The sound wave emission source in the touch pen emits sound waves that are detected by sound wave detectors on the touch screen, providing an additional positioning channel that works alongside the electromagnetic signal detection. This intermediary sound wave mechanism helps eliminate pseudo points and improves report rates without affecting the ease of capacitive touch operation.
2Adaptability or versatility
If active capacitive pens are used to support pressure sensing, then functionality is improved, but positioning accuracy deteriorates due to pseudo points and low report rates
Solution Approach 1:
The patent segments the positioning function into two independent systems: electromagnetic signal detection for basic position identification and sound wave detection for precision positioning and pressure sensing. By dividing the positioning task into these separate functional segments, the system can maintain high functionality with pressure sensing while eliminating the pseudo point problems that plague unified capacitive systems. Each segment operates independently to contribute to overall positioning accuracy.
Solution Approach 2:
The sound wave emission source acts as an intermediary device that enables precise positioning and pressure sensing without compromising the existing capacitive touch functionality. The sound waves provide an additional measurement dimension that helps distinguish real touch points from pseudo points, thereby improving positioning accuracy while maintaining the pressure sensing capability.
3Adaptability or versatility
If touch screens support multiple active pens simultaneously, then adaptability is improved, but positioning accuracy deteriorates due to inability to distinguish multiple pens
Solution Approach 1:
The patent applies local quality by assigning unique sound wave frequency characteristics to each touch pen. Each pen's sound wave emission source emits sound waves at a specific frequency or frequency pattern that is locally distinctive to that pen. The sound wave detectors detect these frequency-specific signals, enabling the system to distinguish between multiple pens simultaneously. This local differentiation through frequency assignment allows accurate multipoint positioning while supporting multiple active pens.
Solution Approach 2:
The system utilizes parameter changes by varying the frequency parameters of sound wave emissions from different pens. Each pen emits sound waves with distinct frequency characteristics, and the controllers detect and differentiate these frequency parameters to identify and locate each pen independently. This parameter-based differentiation enables simultaneous multi-pen support with accurate positioning for each pen.
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 enhances positioning accuracy, enables simultaneous operation of multiple pens, and increases the point report rate, providing accurate and efficient touch control with reduced pseudo points and improved user experience.
Implementation Method 1
the touch display panel is configured to detect an electromagnetic signal sent by an electromagnetic generator of each of the plurality of touch pens
Implementation Method 2
each of the sound wave detectors is configured to detect a sound wave signal sent by a sound wave emission source of each of a plurality of touch pens
Data Source
AI summary
A display screen, a touch pen and a display module are disclosed. The display screen includes a frame, a touch display panel, a controller and a plurality of sound wave detectors; the plurality of sound wave detectors are disposed at different positions on the frame and at the same side of frame as an operating surface of the touch display panel. Sound wave detector detects sound wave signals sent by sound wave emission sources and sends the detected sound wave signals to the controller; the touch display panel detects electromagnetic signals sent by electromagnetic generators and sends them to the controller; the controller determines actual touch positions of a plurality of touch pens on the touch display panel based on the electromagnetic signals and sound wave signals emitted by sound wave emission sources of the touch pens to achieve accurate positioning.