Display Device Pixel Light Source Fingerprint Sensor
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Solution Overview
Problem
Fingerprint sensors integrated into display devices often require a separate external light source, increasing device thickness and manufacturing costs due to the need for additional components like lenses and light sources.
Innovation Solution
A display device configuration that uses the pixels as light sources, with a light-guiding layer and light-condensing layer to direct and concentrate light for fingerprint sensing, eliminating the need for a separate external light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate external light source is used for the fingerprint sensor, then the fingerprint sensing function can be provided, but the thickness of the display device increases and manufacturing costs increase
Solution Approach 1:
The patent merges the light source function with the display panel by using the display pixels themselves as light sources. The light-guiding layer and light-condensing layer are integrated into the display structure, combining the display function and fingerprint sensing function into a single integrated system, thereby eliminating the need for separate external light sources and reducing device thickness
Solution Approach 2:
The display pixels serve dual functions: displaying visual information and providing light for fingerprint sensing. The light-guiding layer and light-condensing layer are multi-functional components that both manage light distribution for display and direct light to photosensors for fingerprint detection, reducing the need for separate dedicated components
2Reliability
If a separate external light source is used for the fingerprint sensor, then the fingerprint sensing function can be provided, but manufacturing costs of the display device increase
Solution Approach 1:
The patent combines multiple functions into shared components, eliminating the need for separate external light sources, lenses, and photosensor assemblies. The light-guiding layer and light-condensing layer serve both display and fingerprint sensing functions, reducing component count and assembly complexity, thereby lowering manufacturing costs
Solution Approach 2:
The display pixels and optical layers perform multiple functions simultaneously - display and fingerprint sensing. This multi-functionality reduces the number of dedicated components needed, simplifying the manufacturing process and reducing overall production costs
3Illumination intensity
If the pixels are used as light sources with light-guiding layer and light-condensing layer, then the amount of light received by photosensors increases, but the device structure becomes more complex
Solution Approach 1:
The light-guiding layer contains localized light-transmission holes positioned specifically above each photosensor, and the light-condensing layer has condensing patterns at precise locations. These localized optical features concentrate light efficiently onto the photosensors without requiring complex overall system design, achieving high illumination intensity while maintaining structural simplicity
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 reduces device thickness and manufacturing costs while enhancing fingerprint sensing performance by increasing the amount of light received by the photosensors, improving the reliability and efficiency of the fingerprint sensor.
Implementation Method 1
a light-guiding layer arranged between the display panel and the photosensor layer and configured to include a plurality of light-transmission holes corresponding to the photosensors, respectively
Implementation Method 2
a light-condensing layer arranged between the display panel and the photosensor layer to overlap the light-guiding layer
Data Source
AI summary
A display device with a display panel including a display area and a plurality of pixels arranged in the display area, a photosensor layer including a sensing area overlapping the display area and a plurality of photosensors arranged in the sensing area, a light-guiding layer arranged between the display panel and the photosensor layer, the light-guiding layer includes a plurality of light-transmission holes corresponding to the plurality of photosensors, wherein the light-guiding layer includes a transparent tube bundle comprising a plurality of transparent tubes forming the light-transmission holes.