Infrared Sensor Placement Under Display With Light Blocking
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Solution Overview
Problem
Full-screen mobile phones face challenges in allocating sensor positions due to the narrow bezel space, which compromises the strength and reliability of the electronic device while existing solutions either reduce screen-to-body ratio or affect the display's working stability with infrared light interference.
Innovation Solution
An electronic device design featuring an infrared sensor positioned below the display screen with a light blocking element between the transmitter and the display region, preventing infrared light from entering the display area, and using a touch layer and coverplate with high transmittance for both visible and infrared light to maintain the full-screen effect and ensure sensor functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the infrared sensor is positioned on the front surface of the display screen, then the sensor can detect distance effectively, but the screen-to-body ratio decreases and the full-screen effect is compromised
Solution Approach 1:
The infrared sensor is moved from the traditional front surface position to the bottom surface of the display screen, utilizing a different spatial dimension. This allows the sensor to maintain its detection function while enabling the front surface to be fully occupied by the display, achieving the full-screen effect without compromising sensor reliability
2Area of stationary object
If the infrared sensor is positioned below the display screen, then the screen-to-body ratio is improved, but infrared light may interfere with the display screen operation
Solution Approach 1:
A light blocking element is introduced to extract and block the infrared light path between the sensor and the display screen. This element selectively prevents infrared light from reaching the display while allowing visible light to pass through, thereby eliminating the harmful interference effect while maintaining the beneficial full-screen design
Solution Approach 2:
The light blocking element acts as an intermediary component positioned between the infrared sensor and the display screen. It mediates the interaction by blocking infrared wavelengths while transmitting visible wavelengths, thus protecting the display from infrared interference without affecting the full-screen appearance
3Reliability
If a light blocking element is introduced to prevent infrared light interference, then display working stability is improved, but the device structure becomes more complex
Solution Approach 1:
The light blocking element is designed to serve multiple functions: it blocks infrared light from reaching the display, maintains the structural integrity of the bottom bezel area, and allows visible light transmission to preserve the full-screen effect. By combining multiple functions in a single component, the structural complexity is minimized while achieving reliable display operation
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 configuration allows for a full-screen design with improved strength and reliability by preventing infrared light interference with the display, ensuring both the display screen and infrared sensor operate effectively without compromising each other's performance.
Implementation Method 1
a light blocking element between the transmitter and the display region and configured to prevent the infrared light emitted by the transmitter from entering the display region
Implementation Method 2
a touch layer and coverplate with high transmittance for both visible and infrared light
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
An electronic device (10), comprising a display screen (13), an infrared sensor (16) and a light-blocking element (30), wherein the display screen (13) comprises a display area (1311) and a non-display area (1312). The infrared sensor (16) comprises a transmitter (161) and a receiver (162). The transmitter (161) is located below the non-display area (1312). The transmitter (161) is used to emit infrared light. The receiver (162) is used to receive the infrared light. The light-blocking element (30) is arranged between the transmitter (161) and the display area (1311), and the light-blocking element (30) is used to block the infrared light emitted by the transmitter (161) from entering into the display area (1311).