Photosensor Display Panel Contact Non-Contact Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices with touch sensors are prone to smudging and reduced display quality due to frequent object contact, requiring high mechanical strength and leading to user fatigue, and struggle to detect objects both in contact and non-contact scenarios effectively.
Innovation Solution
Incorporating a photosensor in each pixel of the display panel that can adjust its sensitivity based on voltage adjustments, reset, accumulating, and selecting operations to differentiate between contact and non-contact situations, allowing for high-quality imaging and rapid detection of both contact and contactless objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If a touch sensor is used to detect object contact, then detection capability is improved, but the display panel becomes prone to smudging and display quality deteriorates
Solution Approach 1:
The patent replaces mechanical touch sensing with optical sensing using photosensors. Instead of relying on physical contact detection that requires a separate touch layer (which causes smudging), the system uses photosensors to detect objects through light interaction, eliminating the need for a dedicated touch sensor layer and thus preventing smudging issues.
Solution Approach 2:
The photosensor serves multiple functions: it acts as both a display element and an object detection sensor. The same pixel structure is used for both displaying images and detecting objects, whether in contact or non-contact scenarios, eliminating the need for separate touch sensing components.
2Adaptability or versatility
If the photosensor sensitivity is increased to detect non-contact objects, then detection range is improved, but detection precision for contact objects deteriorates
Solution Approach 1:
The patent implements dynamic sensitivity adjustment for the photosensor based on the detection scenario. The system can switch between high sensitivity mode for detecting non-contact objects and appropriate sensitivity mode for contact objects, allowing adaptability across different detection ranges while maintaining precision for each specific scenario.
Solution Approach 2:
The system changes the operating parameters of the photosensor (such as integration time, gain, or threshold values) depending on whether contact or non-contact detection is required. This parameter adjustment enables the same sensor to optimize its performance for different detection scenarios.
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 solution enables the display device to detect objects in both contact and non-contact scenarios with improved sensitivity adjustments, enhancing image quality and detection speed, reducing user fatigue and smudging issues.
Implementation Method 1
the photosensor includes a transistor and a photodiode which is electrically connected to a gate of the transistor
Data Source
AI summary
A purpose is to enable detection of an object in a display device including a display panel provided with photosensors when the object touches the display panel and when the object does not touch the display panel. A display device includes a display panel provided with photosensors. The display device has a function of detecting an object with the photosensor when the object touches the display panel and when the object does not touch thereto. The display device has a function of changing the sensitivity of the photosensor varies depending on whether the object touches the display panel.