Capacitive Optical Touch Screen Display System
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Solution Overview
Problem
Optical touch screen devices suffer from long delay times in detecting and determining touch occurrences, leading to user interaction issues and potential erroneous selections due to complex detection methods.
Innovation Solution
A touch screen display system combining a capacitive touch-sensor assembly for detecting touch occurrences and an optical touch-sensor assembly for determining touch locations, with a processor connected to both, allowing for rapid and accurate input determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical touch-sensor assembly is used to detect touch occurrence, then touch location can be determined, but long delay time results from complex detection methods
Solution Approach 1:
The touch detection process is divided into two separate assemblies: a capacitive touch-sensor assembly for detecting touch occurrence and an optical touch-sensor assembly for determining touch location. This segmentation allows each assembly to specialize in its specific function, with the capacitive sensor providing rapid touch detection and the optical sensor providing precise location determination, thereby reducing overall response time while maintaining measurement precision.
2Measurement precision
If complex detection methods are used to determine touch location, then accurate touch location can be determined, but long delay time results
Solution Approach 1:
The patent combines two different sensing technologies (capacitive and optical touch-sensor assemblies) into a unified touch screen display system. The capacitive assembly detects touch occurrence through electrical field changes, while the optical assembly determines location through light interaction. This merging of technologies allows for accurate touch location determination using methods that are less complex and faster than traditional single-system approaches.
3Measurement precision
If optical touch-sensor assembly is used, then touch location can be determined, but additional or erroneous user-selection may occur during waiting period
Solution Approach 1:
The capacitive touch-sensor assembly performs preliminary action by detecting touch occurrence first, which then triggers the optical touch-sensor assembly to determine the precise touch location. This preliminary detection allows the system to prepare for location determination in advance, reducing the waiting period and minimizing the chance of additional or erroneous user selections during the response time.
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 combination reduces response time and minimizes erroneous inputs by determining touch locations quickly, enhancing user interaction and reducing the likelihood of additional or incorrect user selections.
Implementation Method 1
a capacitive touch-sensor assembly at the display device for detecting a touch occurrence on the display device
Implementation Method 2
an optical touch-sensor assembly at the display device for determining a location of the touch occurrence on the display device
Data Source
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AI summary
A touch screen display system for use in an electronic device includes a display device, a capacitive touch-sensor assembly disposed on the display device for detecting a touch occurrence on the display, and an optical touch-sensor assembly at the display device for determining a location of the touch occurrence at the display in response to the capacitive touch-sensor assembly detecting the touch occurrence on the display.