Capacitance and Image Fusion for Accurate Input Position Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing input detection systems for display panels face challenges in accurately detecting input positions, especially when the distance between the touch panel and the indicator is large, leading to reduced resolution and position detection accuracy.
Innovation Solution
An input detection device that combines capacitance detection and image acquisition processing to detect changes in electrostatic capacitance and position the inputter on a display panel, using a controller with processing units for capacitance detection, image acquisition, and position detection, which specifies the input position based on the shape of the inputter and cancels irrelevant capacitance changes to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a plurality of electrodes are connected to form electrode blocks for detecting distant indicators, then detection range is improved, but resolution and position detection accuracy are reduced
Solution Approach 1:
The detection area is divided into multiple sub-areas, each corresponding to a specific electrode. Instead of using electrode blocks that aggregate multiple electrodes, the system segments the detection space so that each electrode independently monitors its corresponding sub-area. This segmentation allows the system to maintain high resolution by detecting capacitance changes at the individual electrode level while still covering a large detection range through the collective arrangement of multiple electrodes.
Solution Approach 2:
The patent introduces image processing technology to add a visual dimension to the capacitance detection system. By capturing images of the indicator and processing them to determine position information, the system creates an additional detection dimension that works complementarily with the capacitance detection. This multi-dimensional approach allows accurate position detection without requiring electrode blocks, thereby maintaining high resolution while expanding detection range.
2Adaptability or versatility
If capacitance detection is used for distant indicators, then detection capability is improved, but detection accuracy deteriorates due to signal weakness
Solution Approach 1:
The patent merges capacitance detection technology with image processing technology to create a hybrid detection system. The capacitance detection provides presence information and rough positioning, while the image processing provides precise position information and visual confirmation. By combining these two detection methods, the system overcomes the signal weakness issue at distance - the image processing can clearly identify the indicator's position even when capacitance signals are weak, thereby maintaining high detection accuracy while preserving extended detection capability.
3Measurement precision
If high-resolution electrode arrays are used, then position detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent uses image processing to create a visual copy or representation of the indicator's position and characteristics. Instead of relying solely on complex electrode arrays to resolve position, the system captures an image of the indicator and processes it to extract position information. This copying approach through imaging allows the system to achieve high position detection accuracy without requiring overly complex electrode configurations, as the image data supplements and simplifies the electrical detection requirements.
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 the accuracy of input position detection on display panels by focusing on the intended input area, improving detection precision without forming electrode blocks, thus maintaining high resolution and preventing erroneous position detection.
Implementation Method 1
a capacitance detection processing unit that detects a change in electrostatic capacitance of the display panel due to the input operation
Implementation Method 2
an image acquisition processing unit that acquires a captured image from an imager that captures an image of the inputter that performs the input operation
Data Source
AI summary
A display device includes: a capacitance detection processing unit that detects a change in electrostatic capacitance of a display panel due to an input operation; an image acquisition processing unit that acquires a captured image from an imager that captures an image of the inputter performing the input operation; and a position detection processing unit that detects the input position on the display panel, based on a change in the electrostatic capacitance, which is detected by the capacitance detection processing unit, and the captured image, which is acquired by the image acquisition processing unit.