Full-Screen Display Pixel With Light-Emitting And Sensing Areas
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Solution Overview
Problem
Conventional lens-based under-screen optical fingerprint or palmprint recognition systems face challenges with decreasing screen transmittance and increasing screen resolution, making it difficult to meet the needs of large-scale biometric recognition.
Innovation Solution
A full-screen display device with unit pixels capable of transmitting and receiving light, featuring a water-oxygen barrier layer, protective panel, unit pixels with light-emitting and light-sensing areas, a light-shielding layer, and lenses to converge and focus light for biometric recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If screen resolution is increased to achieve full-screen display, then display quality is improved, but screen transmittance decreases making optical fingerprint recognition difficult
Solution Approach 1:
The display screen is segmented into multiple unit pixels, each independently configured with light-emitting and light-sensing areas. This segmentation allows each pixel to function as an independent optical sensor while maintaining the overall full-screen display, resolving the contradiction between high resolution and sufficient light transmittance for fingerprint recognition.
Solution Approach 2:
Each unit pixel is designed with multi-functionality, serving both as a display element and as an optical sensor for fingerprint recognition. The light-emitting area and light-sensing area within each pixel enable it to perform both display and biometric recognition functions, eliminating the need for separate sensor components that would reduce transmittance.
2Adaptability or versatility
If conventional lens-based under-screen optical recognition is used, then fingerprint detection is enabled, but it cannot meet large-scale biometric recognition needs due to decreasing transmittance
Solution Approach 1:
The patent merges the light-emitting and light-sensing functions directly into the display pixel structure itself, eliminating the need for separate under-screen lens modules. This integration allows large-scale biometric recognition across the entire display area while maintaining sufficient light transmittance through the optimized pixel structure.
Solution Approach 2:
The patent transitions from a single-point under-screen sensor approach to a distributed two-dimensional array of unit pixels across the display screen. Each unit pixel independently performs optical sensing, enabling large-scale biometric recognition by utilizing the entire display area as the sensing surface.
3Area of stationary object
If unit pixels have both light-emitting and light-sensing areas, then full-screen biometric recognition is achieved, but device structure becomes more complex
Solution Approach 1:
The light-sensing area is nested within or adjacent to the light-emitting area of each unit pixel, with the sensing region positioned to receive light through the same or adjacent pixel structure. This nested configuration enables full-screen biometric recognition functionality while minimizing additional structural complexity by utilizing the existing pixel framework.
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 device enables half-screen or full-screen large-area optical biometric recognition, effectively blocking crosstalk and achieving clear biometric images, thus realizing the full-screen biometric pressing function.
Implementation Method 1
the light-emitting area emits an incident light
Implementation Method 2
the incident light passing through the water-oxygen barrier layer and scattering outwardly through at least one of the lenses
Implementation Method 3
the reflected light passing through the protective panel, entering at least one of the lenses and being converged
Implementation Method 4
the converged reflected light travels along a converged light path and passes through the water-oxygen barrier layer to be received by the light-sensing area and converted into an image electrical signal
Data Source
AI summary
A full-screen display device has unit pixels having function for emitting and receiving light, including a water-oxygen barrier layer, a protective panel, a plurality of unit pixels, a light-shielding layer, and a plurality of lens. At least one of the unit pixels has a light-emitting area inside the unit pixels, and has a light-sensing area inside or outside the unit pixels. For biometrics recognition, the light-emitting area emits an incident light, which penetrates through the water-oxygen barrier layer and scatters outwardly by at least one of the lenses. The scattered incident light penetrates through the protective panel, and is reflected by a test object. The reflected light penetrates through the protective panel and is converged by at least one of the lenses. The converged reflected light penetrates through the water-oxygen barrier, and the light-sensing area receives and converts the reflected light to an image electrical signal.