Display Electrode Segmentation for Fingerprint Sensitivity
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Solution Overview
Problem
High pixel density and small effective area of light-transmitting holes in high PPI AMOLED screens result in low overall light transmittance, leading to low fingerprint identification sensitivity.
Innovation Solution
The display apparatus includes a fingerprint identification region with partially removed electrode layers and omitted driver circuits, allowing for improved light transmittance by creating light-transmitting regions, which enhances fingerprint identification sensitivity without affecting the display function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high pixel density and small effective area of light-transmitting holes are used in AMOLED screens, then display resolution is improved, but light transmittance deteriorates
Solution Approach 1:
The display screen is divided into two distinct regions: a first display region with normal electrode structure for high-resolution display, and a second display region with partially removed electrodes for enhanced light transmittance. This segmentation allows each region to optimize its function independently, resolving the contradiction between resolution and light transmittance.
Solution Approach 2:
Different regions of the display screen are given different electrode configurations tailored to their specific functions. The first display region maintains complete electrode layers for optimal display quality, while the second display region removes portions of electrode layers to maximize light transmittance for fingerprint sensing. This local differentiation resolves the universal contradiction across the entire screen.
2Reliability
If complete electrode layers are maintained in the display layer, then display function is improved, but fingerprint identification sensitivity deteriorates
Solution Approach 1:
The display layer is segmented into two functional zones: the first display region retains complete electrode layers (first electrode layer and second electrode layer) to ensure reliable display function, while the second display region removes portions of these electrode layers to create light-transmitting regions that enhance fingerprint identification sensitivity. This spatial segmentation allows both functions to coexist optimally.
Solution Approach 2:
The electrode layer structure is locally optimized based on functional requirements. In the first display region, complete electrode layers provide excellent display performance. In the second display region, partially removed electrodes create optical pathways for fingerprint sensing. This local quality differentiation resolves the contradiction between display reliability and fingerprint sensitivity.
3Measurement precision
If light-transmitting regions are created by removing electrodes, then fingerprint identification sensitivity is improved, but display uniformity deteriorates
Solution Approach 1:
The display screen is clearly segmented into a first display region for normal display and a second display region for fingerprint sensing. This segmentation isolates the light-transmitting modifications to only the necessary area, preventing disruption to the overall display uniformity in the first region while achieving enhanced fingerprint sensitivity in the second region.
Solution Approach 2:
The electrode removal is applied locally only in the second display region where fingerprint sensing is required, while the first display region maintains its complete electrode structure for uniform display. This localized modification approach resolves the contradiction by confining the structural change to the minimal necessary area.
Data Source
AI summary
Disclosed is a display apparatus, comprising a first display region serving as a fingerprint identification region and a second display region serving as a display region, and comprising a display layer and a driver layer stacked in a stacking direction perpendicular to a plane where the display apparatus is placed. The display layer comprises a first electrode layer and a second electrode layer stacked in the stacking direction, and the driver layer comprises a plurality of driver units. In the first display region, the first electrode layer has a first part corresponding to the first display region, the second electrode layer has a second part corresponding to the first display region, and a projection of the first part in the stacking direction and a projection of the second part in the stacking direction are not completely overlapped.