Display Substrate Hollowed Electrodes for Under-Screen Detection
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Solution Overview
Problem
Current display technologies face challenges in achieving high light transmittance and efficient integration of collection portions, such as cameras and fingerprint readers, due to the low light intensity received from the cathode layer, which affects the screen-to-body ratio and display performance in full-screen displays.
Innovation Solution
A display substrate with a light-emitting device layer featuring a first electrode layer with hollowed-out regions in non-sub-pixel areas, allowing for improved light transmittance and the placement of collection portions in overlapping regions between second electrodes and hollowed-out areas, enhancing light reception and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a continuous first electrode layer is used to ensure electrical connectivity, then electrical reliability is improved, but light transmittance deteriorates due to electrode coverage blocking light
Solution Approach 1:
The first electrode layer is segmented into discrete first electrodes with hollowed-out regions between adjacent electrodes. This segmentation allows light to pass through the hollowed-out areas while the electrode segments maintain electrical connectivity through alternative pathways, resolving the contradiction between continuous electrical coverage and light transmittance.
Solution Approach 2:
Different regions of the electrode structure are assigned different functions: the first electrodes provide electrical connectivity in sub-pixel regions, while the hollowed-out regions between them optimize light transmittance in non-sub-pixel regions. This local differentiation allows simultaneous optimization of both electrical and optical properties in different spatial zones.
2Area of stationary object
If collection portions are placed under the display to achieve high screen-to-body ratio, then display area is improved, but detection efficiency deteriorates due to low light intensity reaching collection portions
Solution Approach 1:
The hollowed-out regions in the first electrode layer serve as optical intermediaries that channel and enhance light transmission to the collection portions positioned beneath the display. These regions act as light guides that improve the intensity of light reaching the collection portions, thereby maintaining detection efficiency while enabling high screen-to-body ratio design.
3Reliability
If electrode structures are optimized for electrical performance, then electrical conductivity is improved, but display effect deteriorates due to electrode visibility and light blocking
Solution Approach 1:
The electrode structure is segmented into discrete first electrodes with hollowed-out regions, reducing the overall electrode coverage area. This segmentation maintains electrical conductivity through the electrode segments while minimizing light blocking, thereby improving display brightness and reducing electrode visibility.
Solution Approach 2:
The electrode design transitions from a two-dimensional continuous plane to a three-dimensional structure with hollowed-out regions. This dimensional change allows the electrode to maintain its electrical function while creating optical pathways through the hollowed-out areas, reducing its impact on display performance.
Data Source
AI summary
A display substrate has a plurality of sub-pixel regions used to display images and a non-sub-pixel region surrounding the sub-pixel regions. The display substrate includes a light-emitting device layer. The light-emitting device layer includes a first electrode layer. The first electrode includes a plurality of first electrodes electrically connected to each other and at least one hollowed-out region among part of adjacent first electrodes. The at least one hollowed-out region is located in the non-sub-pixel region.