Optical Touch Panel Adaptive Sensitivity Correction
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Solution Overview
Problem
Optical type touch panels face challenges in accurately detecting proximity objects due to variations in light reception sensitivity caused by time-dependent degradation and individual differences in light-receiving elements, leading to inconsistent signal intensities and position detection errors.
Innovation Solution
An information input device with an illumination light source, first and second light-receiving elements, and a correction section that performs adaptive sensitivity correction using an intensity monitor signal from the second light-receiving elements to ensure uniform light-receiving signals from proximity objects, allowing for precise object detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light-receiving elements are used to detect reflected light from proximity objects, then proximity object detection is enabled, but light reception sensitivity varies due to time-dependent degradation and individual differences, causing detection accuracy to deteriorate
Solution Approach 1:
The patent implements feedback by introducing second light-receiving elements that monitor the intensity of detection light emitted by the illumination light source. This monitor signal is fed back to a correction section that performs adaptive sensitivity correction on the signals from the first light-receiving elements, compensating for sensitivity variations and ensuring consistent detection accuracy over time
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the sensitivity parameters of the light-receiving elements through adaptive correction. The correction section modifies the signal parameters from the first light-receiving elements based on the intensity monitor signal, compensating for degradation and individual differences without changing the physical structure of the components
2Measurement precision
If adaptive sensitivity correction is performed using second light-receiving elements, then detection accuracy is improved, but device complexity increases due to additional components and correction processing
Solution Approach 1:
The patent applies universality by designing the second light-receiving elements to serve dual purposes: they monitor the intensity of detection light for sensitivity correction, and can also contribute to proximity object detection. This multi-functionality reduces the need for separate monitoring components, thereby limiting the increase in device complexity while maintaining improved detection accuracy
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 adaptive sensitivity correction ensures accurate detection of proximity objects by compensating for sensitivity variations, resulting in consistent and reliable object information retrieval.
Implementation Method 1
light emitted from the display means and then reflected from an external proximity object to return to the display means is detected by light-receiving elements
Implementation Method 2
the second light-receiving elements for monitoring the intensity of the detection light
Data Source
AI summary
An information input device includes an input panel including an illumination light source, a plurality of first light-receiving elements and one or more second light-receiving elements, the illumination light source emitting detection light for detecting an external proximity object, the plurality of first light-receiving elements receiving detection light emitted from the illumination light source and then reflected from the external proximity object, the second light-receiving elements for monitoring the intensity of the detection light; a correction section performing adaptive sensitivity correction on light-receiving signals obtained by the first light-receiving elements through use of an intensity monitor signal of detection light obtained by the second light-receiving element; and an image processing section obtaining object information about one or more of the position, shape and size of the external proximity object based on a picked-up image obtained from the light-receiving signals subjected to the sensitivity correction by the correction section.