Display Substrate Recess Brightness Uniformity
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Solution Overview
Problem
Display substrates with recesses face challenges in achieving uniform brightness due to the inability to lap the cathode onto signal lines at recessed regions, leading to non-uniform VSS potential distribution and brightness issues.
Innovation Solution
A display substrate design featuring a first screen and a second screen with a recess, where a partition structure interrupts the light-emitting functional layer to form an opening, allowing the first electrode to be lapped onto the signal line via this opening, reducing IR drop and brightness differences between screens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light-emitting functional layer is continuous without interruption, then the display coverage is maximized, but the first electrode cannot be lapped onto the signal line at recessed regions, causing non-uniform brightness
Solution Approach 1:
The light-emitting functional layer is segmented by the partition structure to create an opening that allows the first electrode to be lapped onto the signal line at recessed regions, resolving the contradiction between continuous display coverage and electrical connection requirements
Solution Approach 2:
The partition structure acts as an intermediary element that locally interrupts the light-emitting functional layer to enable electrode-lap contact with the signal line, thereby improving brightness uniformity without requiring complete removal of the functional layer
2Loss of energy
If the first electrode is lapped onto the signal line at recessed regions, then IR drop is reduced and brightness uniformity is improved, but the light-emitting functional layer must be interrupted
Solution Approach 1:
The light-emitting functional layer is segmented at specific recessed regions where electrode-lap contact is required, creating localized openings that reduce IR drop while maintaining continuity in other areas to preserve display functionality
Solution Approach 2:
The partition structure is selectively placed at recessed regions where brightness non-uniformity occurs, creating local interruptions in the light-emitting functional layer only where needed for electrical contact, rather than uniformly across the entire display
3Illumination intensity
If a partition structure is introduced to enable electrode-lap contact, then brightness uniformity is improved, but the device structure becomes more complex
Solution Approach 1:
The partition structure segments the light-emitting functional layer only at necessary locations to enable electrode contact, minimizing structural complexity while achieving the brightness uniformity improvement
Solution Approach 2:
The partition structure extracts or removes portions of the light-emitting functional layer at recessed regions to create openings for electrode-lap contact, thereby improving brightness uniformity with minimal additional complexity
Data Source
AI summary
The present disclosure provides a display substrate, a manufacturing method and a display device. The display substrate includes a first screen and a second screen, and outer contours of the first screen and the second screen cooperate with each other to define an recess. The display substrate includes: a back plate including a first signal line arranged in a peripheral region of the first screen and the second screen; and a light-emitting element including a first electrode, a light-emitting functional layer and a second electrode laminated one on another. A partition structure is provided along an edge of the recess in the peripheral region of the first screen and the second screen, the light-emitting functional layer is interrupted by the partition structure to form an opening, and the first electrode covers the partition structure in a shape-following manner and is lapped onto the first signal line via the opening.