Infrared Touch Screen Gated by Tactile Force
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Solution Overview
Problem
Infrared touch screens are susceptible to accidental activation by random objects, leading to unintended touch events and reduced accuracy due to their reliance on infrared sensors alone.
Innovation Solution
Integration of a tactile sensor that detects touch events through shock, impact, or vibration, which triggers the activation of infrared sensors to locate the touch event, minimizing accidental detections by using both infrared and tactile sensors for confirmation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If infrared sensors are used to detect touch events, then the touch screen can identify touch location, but the system becomes susceptible to accidental activation by random objects blocking infrared beams
Solution Approach 1:
The patent combines infrared sensors with acoustic pulse recognition technology into a hybrid touch detection system. The infrared sensors provide continuous touch location monitoring while the acoustic pulse recognition acts as a gate to validate whether the detected blockage corresponds to an intentional touch event, thereby resolving the contradiction between detection capability and reliability.
Solution Approach 2:
The acoustic pulse recognition system serves as an intermediary validation layer between the infrared sensor detection and the final touch event registration. It mediates by analyzing vibration patterns to confirm whether an object blocking the infrared beam represents a genuine user intent, thus improving reliability without sacrificing detection precision.
2Reliability
If acoustic pulse recognition technology is used to improve accuracy, then accidental activations are reduced, but the system becomes expensive and unsuitable for common applications
Solution Approach 1:
Instead of using full acoustic pulse recognition for all detection scenarios, the patent applies it partially as a gating mechanism only when infrared sensors detect potential touch events. This selective application maintains high reliability for validating touch events while avoiding the excessive cost of continuous acoustic monitoring, thus resolving the contradiction between accuracy and system complexity.
3Reliability
If multiple sensors are integrated to improve reliability, then accidental touch events are minimized, but the device complexity increases
Solution Approach 1:
The patent implements a dynamic sensor activation strategy where acoustic pulse recognition is activated only when infrared sensors detect potential touch events. This dynamic gating approach ensures high reliability through multi-sensor validation while minimizing the operational complexity by keeping the acoustic system dormant during normal operation, thus resolving the contradiction between reliability and device 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
This approach enhances the accuracy and reliability of touch event detection by distinguishing intentional user inputs from unintentional objects, thereby improving the overall performance and durability of the touch screen.
Implementation Method 1
A tactile sensor senses a touch event. The touch event may be, for example, a touch event initiated intentionally by a user.
Implementation Method 2
A tactile sensor senses a touch event. The touch event may be, for example, a touch event initiated intentionally by a user.
Implementation Method 3
Infrared touch screens utilize a row of x-axis infrared emitters and a corresponding row of x-axis infrared sensors. A column of y-axis infrared emitters and a corresponding column of y-axis infrared sensors are also used.
Implementation Method 4
When a hand or stylus comes into contact with the display device, infrared light emitted from one or more emitters is blocked and this blockage is detected by one or more corresponding sensors
Data Source
AI summary
A touch-sensitive display device includes a display. A transparent plate is provided in front of the display. A tactile sensor senses a touch event. One or more infrared sensors are positioned in front of the transparent plate. The one or more infrared sensors identify a location of the touch event when the tactile sensor detects a touch event.