Anode Shape Optimization for Fingerprint Recognition in Display Panels
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Solution Overview
Problem
In display panels with fingerprint recognition, the existing arrangement of metal layers within the display area results in a small non-opaque region, leading to low light reflection and detection accuracy due to the blocking of light by the metal structure, limiting the area available for fingerprint recognition.
Innovation Solution
The display panel design includes a base substrate with gate and data lines forming sub-pixel regions, where the anode of the light-emitting element is positioned to form an angle with the row direction, reducing its overlap with the primary non-opaque region and increasing light transmittance, and the anode's shape is adjusted to minimize blocking, allowing more light to reach the fingerprint recognition region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the anode is arranged in a conventional rectangular shape aligned with the row direction, then the manufacturing process is simple, but the non-opaque region area is small resulting in low light transmittance and poor fingerprint recognition accuracy
Solution Approach 1:
The anode is designed with an asymmetric shape where one pair of opposite edges extends along the row direction while the other pair of opposite edges extends along the column direction. This asymmetric arrangement creates a larger non-opaque region area compared to conventional symmetric rectangular anodes, thereby increasing light transmittance and improving fingerprint recognition accuracy without significantly complicating the manufacturing process
Solution Approach 2:
The anode structure transitions from a conventional two-dimensional rectangular shape to a more complex three-dimensional configuration by extending edges in both row and column directions. This dimensional enhancement creates additional non-opaque regions that improve light transmission paths for fingerprint recognition while maintaining manufacturing feasibility
2Illumination intensity
If the metal layer arrangement is optimized to increase non-opaque region area, then light transmittance improves, but the device structure becomes more complex
Solution Approach 1:
The anode structure implements local quality optimization by creating specific non-opaque regions at predetermined positions where light transmission is most needed for fingerprint recognition. The edges extending along both row and column directions are strategically positioned to maximize light transmittance in the fingerprint recognition area while maintaining appropriate metal layer coverage in other regions
Solution Approach 2:
The anode geometry parameters are optimized by changing the edge extension directions and angles. Specifically, one pair of opposite edges extends along the row direction while the other pair extends along the column direction, creating optimal light transmission paths. This parameter optimization increases the non-opaque region area and improves light transmittance without requiring fundamental changes to the metal layer stacking sequence or material composition
Data Source
AI summary
The present disclosure provides a display panel and a display device. The display panel includes: gate lines and data lines defining sub-pixel regions, each of which includes a pixel circuit and a light emitting element having an anode; and light-emission control signal lines and power signal lines dividing each sub-pixel region into a primary non-opaque region and a non-primary non-opaque region, the pixel circuit being located within the non-primary non-opaque region. The display area includes a fingerprint recognition region, and each anode within the fingerprint recognition region has an approximately quadrangular shape having parallel opposite edges. At least one pair of opposite edges of the anode forms an angle α with respect to a row direction, where 0°<α<90°.