Rear-Mounted Infrared Sensor for Bezel-Free Display
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Solution Overview
Problem
Display devices without bezels face challenges in integrating infrared sensors, as they need to maintain image display on the entire front surface while incorporating infrared sensing functions, which is difficult due to the absence of a bezel for sensor placement.
Innovation Solution
The display device incorporates an infrared sensing module on its rear surface, transmitting infrared light perpendicular to the front surface through a region with lower pixel density, allowing it to recognize objects without affecting the luminance of the pixels and enabling various sensing functions like proximity, gesture, or fingerprint recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the bezel is eliminated to maximize the front surface display area, then the display area is improved, but the infrared sensor integration becomes difficult
Solution Approach 1:
The infrared sensing module is relocated from the front surface (2D plane) to the rear surface of the display device, utilizing the third dimension (depth) to resolve the spatial conflict between maximizing front display area and integrating sensing functionality
Solution Approach 2:
Instead of placing the infrared sensor on the conventional front surface location, the sensor module is inverted and positioned on the rear surface, transmitting infrared light through the display panel from the back side
2Adaptability or versatility
If the infrared sensor is placed on the front surface, then the sensing function is achieved, but the display area is reduced
Solution Approach 1:
The sensing function is achieved by moving the sensor to the rear surface, utilizing the Z-axis dimension rather than consuming front surface area, thereby maintaining full display area while preserving sensing capability
3Measurement precision
If the infrared light wavelength is increased to reduce pixel impact, then the sensing accuracy is improved, but the light transmission through the panel becomes more difficult
Solution Approach 1:
The system optimizes the infrared wavelength parameter within a specific range (1200-1400nm) to achieve the best balance between sensing accuracy and light transmission efficiency, considering the display panel's transmission characteristics at different wavelengths
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 solution allows the display device to maintain normal image display on the entire front surface while incorporating infrared sensing capabilities, enhancing object recognition and maintaining pixel luminance by using infrared light with a wavelength greater than 1200 nm, which minimizes leakage current changes in transistors.
Implementation Method 1
an infrared sensing module configured to transmit infrared light including at least a first infrared light that passes in a first direction away from the front surface of the display panel and through the active region, and the infrared sensing module is configured to receive a second infrared light that passes in a second direction toward the front surface of the display panel and through the active region
Data Source
AI summary
A display device includes a display panel and an infrared sensing module. The display panel includes an active region in which a pixel that emits light based on a data signal is disposed. The infrared sensing module transmits a first infrared light that passes through the active region and receives a second infrared light that passes through the active region to recognize an object. The wavelength of the first infrared light may have a wavelength greater than a predetermined value so that a luminance of light emitted by the pixel is not affected by operation of the infrared sensing module.