OLED Display Panel Light-Transmitting Holes for Under-Screen Fingerprint
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Solution Overview
Problem
The under-screen fingerprint recognition technology for OLED displays using a Color-on-Encapsulation (COE) process faces low light transmittance issues due to the black matrix and electrode layers, affecting fingerprint collection accuracy and display quality.
Innovation Solution
The OLED display panel incorporates light-transmitting holes in the black matrix and second hollow-out regions in the electrode layer, allowing light to pass through to photosensitive fingerprint sensors with minimal loss, while using transparent organic material layers to enhance light transmittance and reduce reflected light intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light-transmitting holes are arranged in the black matrix and second hollow-out regions are created in the electrode layer, then light transmittance is improved and fingerprint collection accuracy is enhanced, but device complexity increases due to additional structural elements
Solution Approach 1:
The black matrix is segmented by creating light-transmitting holes at specific positions, allowing light to pass through while maintaining the black matrix's light-blocking function in other areas. Similarly, the electrode layer is segmented with second hollow-out regions to enable light transmission paths to the fingerprint sensors without compromising electrical functionality.
Solution Approach 2:
The black matrix and electrode layer have different local properties: regions with light-transmitting holes and hollow-out regions have high light transmittance for fingerprint sensing, while other regions maintain their original light-blocking and electrical conduction properties. This local differentiation optimizes both display quality and fingerprint recognition.
2Measurement precision
If transparent organic material layers are used to enhance light transmittance, then fingerprint sensor performance is improved, but manufacturing complexity increases due to additional material deposition steps
Solution Approach 1:
Transparent organic material layers are introduced as intermediary elements between the electrode layer and the fingerprint sensors. These layers serve as optical mediators that enhance light transmission to the sensors while maintaining electrical isolation and structural integrity, thereby improving fingerprint detection without directly modifying the sensor itself.
3Illumination intensity
If the second electrode layer uses light-blocking materials, then OLED light emission is maintained, but light transmittance for fingerprint sensors is reduced
Solution Approach 1:
The second electrode layer is segmented into light-blocking regions (maintaining OLED emission) and light-transmitting regions (with second hollow-out regions for fingerprint sensing). This segmentation allows the electrode layer to simultaneously fulfill its dual functions of electrical conduction/light blocking for display and light transmission for biometric sensing.
Solution Approach 2:
The second electrode layer exhibits local quality differentiation: areas corresponding to OLED pixels use light-blocking materials to maintain display brightness, while areas with second hollow-out regions use transparent or removed sections to enable fingerprint sensor operation. This spatial variation in material properties resolves the contradiction between display and sensing functions.
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 increases light transmittance and maintains accurate fingerprint collection and display quality by minimizing the impact of electrode layers on light transmission.
Implementation Method 1
light-transmitting holes are arranged in the black matrix, the second electrode layer has a plurality of second hollow-out regions, and respective orthographic projections of the plurality of light-transmitting holes, the plurality of second hollow-out regions and the plurality of photosensitive fingerprint sensors on the base plate at least partially overlap with one another
Implementation Method 2
a plurality of photosensitive fingerprint sensors arranged on a second side of the base plate opposite to the first side of the base plate
Data Source
AI summary
An OLED display panel and a manufacturing method of the same are provided. The OLED display panel includes a base plate, a first electrode layer and a pixel definition layer on a first side of the base plate, a plurality of electroluminescent layers on the first electrode layer, a second electrode layer covering the pixel definition layer and the plurality of electroluminescent layers, an encapsulation layer covering the second electrode layer, a black matrix and a color filter layer on the encapsulation layer and a plurality of photosensitive fingerprint sensors on a second side of the base plate; a plurality of light-transmitting holes are arranged in the black matrix, and orthographic projections of the plurality of light-transmitting holes on the second electrode layer are in hollow-out regions of the second electrode layer, respectively; and the photosensitive fingerprint sensors are in the orthographic projections of the light-transmitting holes, respectively.