Display Panel Signal-Line Layout for Under-Screen Sensing
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Solution Overview
Problem
The challenge of achieving a high screen-to-body ratio in display screens with notch regions, such as bang or water drop screens, is addressed by integrating sensors under the display screen, but this approach does not fully realize a true 'full screen' display due to non-display areas.
Innovation Solution
A display panel design with a first region containing first and second sub-regions, where pixel circuits and signal lines are arranged to minimize overlap with the display area, allowing a sensor to be placed behind the display panel without obstructing light transmission, and a bending region enables flexible panel design to reduce bezel width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If pixel circuits are placed inside the display region, then display area is maximized, but light transmittance is reduced due to circuit obstruction
Solution Approach 1:
The pixel circuits are moved from the two-dimensional display plane to a third-dimensional location behind the display panel, allowing light to pass through the display region without obstruction while circuits remain functional through bent connection lines
Solution Approach 2:
The pixel circuits are nested behind the display panel structure, with connection lines extending from the front display surface through the panel thickness to reach the circuits positioned at the rear, enabling both high light transmittance and circuit functionality
2Productivity
If notch region is added for sensor placement, then screen-to-body ratio is improved, but display area is reduced due to non-display notch region
Solution Approach 1:
The sensor is relocated from the front surface notch region to the third-dimensional space behind the display panel, allowing the entire front surface to be used for display while the sensor functions from the rear position
Solution Approach 2:
The sensor is nested within the display panel structure at the rear, with optical paths extending through the panel to enable sensing functionality without occupying front display area
3Area of stationary object
If sensor is placed under display panel, then display area is maximized, but manufacturing complexity increases due to precise positioning requirements
Solution Approach 1:
The display panel is segmented into distinct functional layers with the sensor positioned in a separate region behind the display, connected through dedicated optical paths, simplifying the integration process
Solution Approach 2:
Optical paths serve as intermediaries between the rear-positioned sensor and the front display surface, enabling precise sensing functionality without requiring direct front-surface sensor placement
Data Source
AI summary
A display panel has a first region including a first display region and a second display region, the first display region includes a first sub-region and a second sub-region. The display panel includes: a substrate; light-emitting devices including first light-emitting devices located in the first display region and second light-emitting devices located in the second display region; pixel circuits including first pixel circuits coupled to the first light-emitting devices and second pixel circuits coupled to the second light-emitting devices; and signal lines. The first pixel circuits are located outside the first display region, and the second pixel circuits are located in the second display region. Each of at least one signal line of the signal lines is coupled to at least one first pixel circuit, and an orthogonal projection of the at least one signal line on the substrate overlaps the second sub-region, and does not overlap the first sub-region.