OLED Display Substrate Cathode Window Design for Splicing Gap Reduction
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Solution Overview
Problem
Large-sized OLED display devices spliced from individual small-sized substrates suffer from significant non-display splicing regions, leading to non-uniform luminance and compromised display quality due to increased resistance and voltage drop along longer cathode and anode lines.
Innovation Solution
A display substrate design featuring a base substrate with multiple display units, each with an anode, organic light-emitting layer, and cathode, where cathode lines are connected to driving ICs through insulating layers with strategically placed cathode windows, allowing cathodes to share common windows and reducing the non-display region by arranging display units in a compact manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple small-sized OLED display substrates are spliced to obtain a large-sized display device, then the screen size is increased, but the non-display splicing region area increases and display quality deteriorates
Solution Approach 1:
The invention divides the cathode structure into multiple segments: individual cathodes for each display unit, shared cathode lines, and cathode windows in the insulating layer. This segmentation allows each display unit to have its own cathode while sharing common connection paths, reducing the need for extensive splicing regions between substrates.
Solution Approach 2:
Adjacent display units share common cathode lines and cathode windows. The cathode lines extend through multiple display units, and cathode windows serve multiple cathodes simultaneously. This merging reduces the total number of separate cathode structures and minimizes non-display regions between spliced substrates.
2Area of stationary object
If cathode lines are extended to connect distant cathodes, then the connection coverage is increased, but the resistance increases and voltage drop increases
Solution Approach 1:
The cathode connection system is segmented into multiple cathode lines that serve different regions. Each cathode line connects to a driving IC, creating shorter, more efficient connection paths. This segmentation reduces the length of individual cathode lines and minimizes voltage drop while maintaining comprehensive coverage.
Solution Approach 2:
Cathode windows in the insulating layer serve as intermediary connection points between cathodes and cathode lines. These windows provide direct vertical access from cathodes through the insulating layer to the cathode lines, reducing the need for long horizontal connections and minimizing resistance.
3Area of stationary object
If non-display regions are reduced for better display quality, then the display area increases, but the manufacturing complexity increases
Solution Approach 1:
The insulating layer is segmented with multiple cathode windows strategically positioned to serve different cathodes. This segmentation allows the cathode lines to access multiple cathodes through discrete windows, simplifying the overall structure while maximizing display area and reducing non-display regions.
Solution Approach 2:
The cathode connection structure transitions from a planar layout to a multi-layer vertical structure. Cathode lines are positioned in a lower layer while cathodes are in an upper layer, connected through vertical cathode windows in the insulating layer. This dimensional change allows compact arrangement and reduces non-display region area.
Data Source
AI summary
A display substrate, a display panel and a display device are provided. The display substrate includes: a base substrate including a plurality of display units, wherein each of the plurality of display units is provided with an anode, an organic light-emitting layer and a cathode, wherein anodes of different display units are separated from each other; a plurality of cathode lines connected to the driving ICs, wherein the cathode lines are arranged between the cathode and the base substrate; an insulating layer arranged between the cathode lines and the cathodes, wherein a plurality of cathode windows corresponding to the cathode lines formed in the insulating layer, wherein at least part of the plurality of cathode windows respectively corresponds to at least two display regions, a cathode at each of the display region is connected to the respective cathode line via the cathode window corresponding to the display region.