Integrated Display Pixels for Near-Infrared Biometric Detection
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Solution Overview
Problem
Existing display devices lack the capability to detect optical signals in the near-infrared wavelength band and extract biometric and component information efficiently.
Innovation Solution
A display device incorporating display pixels, near-infrared light emitting pixels, and light sensing pixels arranged in a matrix, with a component detection circuit to analyze light sensing signals for extracting biometric and component information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If display devices use conventional visible light emission and detection, then image display function is achieved, but detection capability in near-infrared wavelength band is lost
Solution Approach 1:
The display panel integrates multiple pixel types (visible light emitting pixels and near-infrared light emitting pixels) into a single device structure. The light sensing pixels can detect both visible light and near-infrared light, enabling the display device to perform both image display and multi-spectral detection functions simultaneously, thereby achieving universal functionality across different wavelength bands
Solution Approach 2:
The patent extends the detection capability from the visible light spectrum to the near-infrared spectrum by adding near-infrared light emitting pixels and corresponding sensing pixels. This adds a new dimension (wavelength band) to the optical detection capability while maintaining the existing visible light display function
2Adaptability or versatility
If separate sensors are added for near-infrared detection, then detection capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the near-infrared light emitting function and visible light display function into a single integrated display panel structure. The near-infrared light emitting pixels share the same substrate and encapsulation structure as the visible light emitting pixels, eliminating the need for separate sensor modules and reducing overall device complexity
Solution Approach 2:
The display panel is segmented into different functional pixel types (red, green, blue emitting pixels, near-infrared emitting pixels, and light sensing pixels) arranged in specific patterns. This segmentation allows each pixel type to perform its specialized function while the overall structure remains unified and manageable
3Measurement precision
If light sensing pixels are integrated into display panel, then optical signal detection is enabled, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements different local qualities for different pixel types within the same display panel. The near-infrared light emitting pixels and light sensing pixels are positioned at specific locations with optimized characteristics for their respective functions, while maintaining overall manufacturing feasibility through standardized fabrication processes
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 the detection of optical signals and extraction of various component information, enhancing the application fields and utilization of display devices.
Implementation Method 1
a near-infrared light emitting pixel including a near-infrared light emitting element and a pixel driving unit that supplies a driving current to the near-infrared light emitting element
Implementation Method 2
a light sensing pixel that senses reflected light incident from a front side
Data Source
AI summary
A display device includes display pixels arranged in a display area of a display panel, near-infrared light emitting pixels alternately arranged with the display pixels, light sensing pixels alternately arranged with the display pixels, a display scan driver that supplies display scan signals to the display pixels and the near-infrared light emitting pixels, a component detection circuit that analyzes component information according to light sensing signals reflected from a front side by using the light sensing signals received from the light sensing pixels, and a main driving circuit that controls driving timings of the display pixels, the light emitting pixels, and the display scan driver.