Optical Touch Display Layout With Light-Concentrating Finger Sensing
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Solution Overview
Problem
Optical touch technology faces inaccuracies due to significant light loss as the reflected light travels a long path to reach the photosensitive element, leading to poor finger positioning and fingerprint recognition accuracy.
Innovation Solution
A display device and touch controller design that includes a photosensitive element with a light-concentrating element on its surface, positioned between the display panel and the protective screen, to converge and enhance the light reaching the photosensitive element, thereby improving light collection and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the photosensitive element is positioned deeper in the display structure, then it can be integrated with other components, but the light path becomes longer causing significant light loss and reduced touch accuracy
Solution Approach 1:
A light-concentrating element (lens) is introduced as an intermediary component between the protective screen and the photosensitive element. This lens captures reflected light over a wider area and concentrates it onto the photosensitive element, enabling effective light collection while maintaining a compact integrated structure with the display components.
Solution Approach 2:
The solution transitions from a planar arrangement to a three-dimensional structure by adding the light-concentrating lens element. This dimensional change allows the system to collect light from a larger area and focus it onto the photosensitive element, overcoming the light loss problem without increasing the overall footprint of the integrated structure.
2Ease of operation
If the light path is lengthened to accommodate structural integration, then component arrangement is improved, but measurement precision of touch location deteriorates due to light loss
Solution Approach 1:
The light-concentrating lens acts as a mediator that preserves measurement precision despite the lengthened light path. By capturing and concentrating reflected light, it ensures sufficient light intensity reaches the photosensitive element, maintaining accurate touch location detection while allowing flexible component arrangement.
3Device complexity
If no light-concentrating element is used, then the structure remains simple, but the photosensitive current intensity is insufficient leading to poor finger positioning accuracy
Solution Approach 1:
The addition of the light-concentrating element changes the optical parameters of the system by concentrating light energy onto the photosensitive element. This increases the photosensitive current intensity and improves finger positioning accuracy, while the element itself remains a simple optical component that can be integrated without major structural 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
The integration of a light-concentrating element on the photosensitive surface increases the intensity of the photosensitive current, enhancing the accuracy of finger positioning and fingerprint recognition, while reducing light loss and misjudgment.
Implementation Method 1
a light-concentrating element arranged on the photosensitive surface of the photosensitive element... part of the light that would otherwise be unable to reach the photosensitive element (e.g., the reflected light from a touching finger) converge toward the photosensitive surface
Implementation Method 2
The photosensitive element includes a photosensitive surface that receives light... increasing the amount of light reaching the photosensitive surface of the photosensitive element, thereby increasing the intensity of the created photosensitive current
Data Source
AI summary
A display device and a touch controller are disclosed. The display device includes a protective screen, a display panel, a photosensitive element, and a light-concentrating element. The protective screen is arranged on a light-emitting surface of the display device. The photosensitive element is arranged between the display panel and the protective screen. The photosensitive element includes a photosensitive surface that receives light, and a light-concentrating element is arranged on the photosensitive surface of the photosensitive element.