Anti-Reflection Black Matrix for Fingerprint Sensing
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Solution Overview
Problem
Display devices face issues with luminance degradation due to external light reflection, which affects fingerprint sensing accuracy and requires additional thickness for anti-reflection layers.
Innovation Solution
Incorporating a photosensitive fingerprint sensor with a substrate, pixel layer, and anti-reflection layer that includes a black matrix with specific openings and a color filter, along with a light blocking layer to minimize thickness and prevent external light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional anti-reflection layer is added to prevent external light reflection, then luminance degradation is prevented, but the display panel thickness increases
Solution Approach 1:
The patent combines the anti-reflection layer with the existing pixel layer structure by forming the anti-reflection layer on the same substrate as the pixels. The black matrix patterns are integrated into the pixel layer design, allowing the anti-reflection functionality to be merged with the display structure rather than added as a separate thick layer.
Solution Approach 2:
The anti-reflection layer uses local black matrix patterns positioned specifically at pixel boundaries and non-emissive regions where reflection would interfere with sensing. This localized approach provides anti-reflection protection only where needed, maintaining thin overall thickness while preventing luminance degradation in critical areas.
2Object-affected harmful factors
If the anti-reflection layer is made thicker to improve reflection prevention, then external light reflection is reduced, but manufacturing complexity increases
Solution Approach 1:
The anti-reflection layer serves multiple functions simultaneously: it prevents external light reflection, defines pixel boundaries through black matrix patterns, and maintains structural integrity with the pixel layer. This multi-functionality reduces the need for additional separate layers or complex manufacturing steps.
Solution Approach 2:
The anti-reflection layer is formed using composite material structures including the black matrix material combined with the pixel layer substrate. This composite approach provides effective reflection prevention while maintaining compatibility with existing manufacturing processes and material systems.
3Measurement precision
If a photosensitive fingerprint sensor is integrated with the display panel, then fingerprint sensing accuracy is maintained, but the device structure becomes more complex
Solution Approach 1:
The fingerprint sensor is merged with the display panel by positioning the photo sensors on the inner surface of the display panel opposite the pixels. The same substrate and structural layers serve both display and sensing functions, eliminating the need for a separate fingerprint sensor module.
Solution Approach 2:
The anti-reflection layer with its black matrix patterns acts as an intermediary structure that facilitates both display output and fingerprint sensing. It allows light to pass through for sensing while preventing external light interference, thereby maintaining sensing accuracy without requiring additional complex intermediary components.
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 solution effectively prevents luminance degradation while maintaining fingerprint sensing accuracy, minimizing the display panel's thickness, and reducing manufacturing costs.
Implementation Method 1
an anti-reflection layer on the pixel layer, the anti-reflection layer comprising a black matrix
Implementation Method 2
The photo sensor may acquire fingerprint information by receiving light reflected by a finger of a user
Implementation Method 3
A photosensitive type fingerprint sensor may comprise a light source and a photo sensor
Implementation Method 4
a light emitting element layer on the circuit element layer, the light emitting element layer comprising an emitting layer overlapping with the first area
Data Source
AI summary
A display device may include a sensor layer, a substrate, a pixel layer, and a black matrix. The sensor layer may include photo sensors. The substrate may be positioned on the sensor layer. The pixel layer may be positioned on the substrate and may include pixels. The substrate may be positioned between the sensor layer and the pixel layer. The pixels may include pixel electrodes. The black matrix may be positioned on the pixel layer, may include first-set openings respectively overlapping with the pixel electrodes, and may include second-set openings not overlapping with any pixel electrodes of the display device in a direction perpendicular to the substrate. The pixel layer may be positioned between the substrate and the black matrix.