Movable IR Cut Filter for Compact Camera Touch Module
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Solution Overview
Problem
Current camera modules in display devices, such as mobile phones, are unable to realize both photographing and floating touch functions efficiently due to the need for separate modules, resulting in a less compact structure and reduced space utilization.
Innovation Solution
A floating touch camera module with a movable infrared cut filter film and anti-reflection film, allowing the same camera module to switch between photographing and touch modes by filtering out infrared light during photography and allowing full-spectrum light capture during touch operations, along with an infrared supplementary lighting system for low-light conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate camera modules are used for photographing and floating touch, then each function can be performed independently, but the device structure becomes less compact and space utilization is reduced
Solution Approach 1:
The patent combines photographing and floating touch functions into a single camera module. The camera module includes an image sensor that can operate in two modes: photographing mode with an infrared cut filter film to block infrared light, and floating touch mode with the infrared cut filter film moved away to allow infrared light passage. This merging eliminates the need for separate modules while maintaining functional independence through a movable filter mechanism.
Solution Approach 2:
The camera module is designed with multi-functionality to perform both photographing and floating touch operations. By incorporating a movable infrared cut filter film and an image sensor capable of detecting both visible and infrared light, the single module universally handles both functions, reducing overall device space requirements.
2Reliability
If the infrared cut filter film is positioned to face the lens, then infrared light is filtered out for photographing, but floating touch detection is blocked
Solution Approach 1:
The infrared cut filter film is designed to be movable rather than fixed. It can dynamically change position between facing the lens (for photographing mode to block infrared light) and being offset from the lens (for floating touch mode to allow infrared light passage). This dynamic positioning enables the system to adapt between different functional requirements.
Solution Approach 2:
The system alternates between two operational states: photographing mode where the infrared cut filter film blocks infrared light, and floating touch mode where it allows infrared light passage. The periodic switching between these states is controlled by moving the filter film to appropriate positions based on the required function.
3Adaptability or versatility
If the camera module captures full-spectrum light for touch detection, then floating touch function is enabled, but photographing quality deteriorates due to infrared interference
Solution Approach 1:
The system applies different optical filtering characteristics to different operational modes. In photographing mode, the infrared cut filter film is positioned to selectively block infrared light while allowing visible light passage, ensuring high image quality. In floating touch mode, the filter is moved away to allow full-spectrum light capture for accurate touch detection. Each mode receives optimized light filtering appropriate to its 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
Enables both photographing and floating touch functions with a single camera module, reducing space occupancy and enhancing the overall device design by maintaining a compact structure while effectively capturing hand movements and images.
Implementation Method 1
an infrared cut filter film at one side of a light incident surface of the image sensor and configured to filter out infrared light rays
Implementation Method 2
a lens with a light collection surface and a light emitting surface; an image sensor at one side of the light emitting surface of the lens; wherein the image sensor is configured to receive light rays from the lens and form sensing information
Data Source
AI summary
The present disclosure provides a floating touch camera module, a display device and a touch method. The floating touch camera module includes: a lens with a light collection surface and a light emitting surface; an image sensor at one side of the light emitting surface of the lens, the image sensor configured to receive light rays from the lens and form sensing information; and an infrared cut filter film at one side of a light incident surface of the image sensor and configured to filter out infrared light rays. The infrared cut filter film is movable relative to the lens between a first position at which the infrared cut filter film directly faces the lens and a second position at which the infrared cut filter film is offset from the lens, thereby enabling the floating touch camera module to switch between a photographing mode and a touch mode.