Display Substrate Pad Layer Layout for OLED Chromatic Aberration
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Solution Overview
Problem
OLED display substrates suffer from chromatic aberration due to asymmetrical edge regions of the electroluminescent material layer, causing uneven light emission.
Innovation Solution
A display substrate design with a first conductive layer including a first signal line, a second signal line, and an additional pad layer, where the electroluminescent material layer has symmetrical end portions, with the additional pad layer ensuring both edge regions are at the same height and thickness, reducing chromatic aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the electroluminescent material layer has asymmetrical edge regions, then the device structure is simpler, but chromatic aberration occurs due to uneven light emission
Solution Approach 1:
The patent applies asymmetry principle by intentionally designing the additional pad layer to be positioned only on one side (the second side) of the electroluminescent material layer, creating an asymmetrical conductive layer structure. This asymmetrical design compensates for the asymmetrical edge regions of the electroluminescent material layer, ensuring that both edge regions are at the same height despite the structural asymmetry. This resolves the chromatic aberration caused by uneven light emission while maintaining a relatively simple device structure.
Solution Approach 2:
The patent applies local quality principle by adding the additional pad layer specifically at the second edge region of the electroluminescent material layer, where height compensation is needed. The additional pad layer is positioned locally rather than uniformly across the entire structure, and its thickness is specifically designed to compensate for the height difference at that particular location. This localized approach corrects the chromatic aberration without unnecessarily complicating the overall device structure.
2Object-affected harmful factors
If the additional pad layer is added to compensate edge region heights, then chromatic aberration is reduced, but the conductive layer structure becomes more complex
Solution Approach 1:
The patent applies merging principle by integrating the additional pad layer with the existing conductive layer structure. The additional pad layer is formed as part of the same conductive layer that includes the first and second signal lines, using the same conductive material and formation process. This merging approach minimizes the increase in structural complexity while achieving the height compensation function to reduce chromatic aberration.
Solution Approach 2:
The additional pad layer serves multiple functions: it acts as a conductive element for electrical connections, provides height compensation for the electroluminescent material layer edge regions, and maintains structural integrity. By designing this single component to fulfill multiple roles, the patent reduces chromatic aberration without proportionally increasing the conductive layer structure complexity.
3Ease of manufacture
If the electroluminescent material layer edge regions are at different heights, then manufacturing is simpler, but light emission becomes uneven causing chromatic aberration
Solution Approach 1:
The patent applies preliminary action principle by pre-compensating for the height difference in the conductive layer structure before the electroluminescent material layer is formed. The additional pad layer is positioned and sized in advance to offset the anticipated height difference, ensuring that when the electroluminescent material layer is deposited, both edge regions end up at the same height. This preliminary compensation maintains manufacturing simplicity while preventing uneven light emission.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design ensures symmetrical light emission from both edge regions of the OLED pixels, effectively reducing chromatic aberration and enhancing display quality.
Implementation Method 1
OLED (Organic Light-Emitting Diode) is a device that generates electroluminescence using a multilayer organic thin film structure
Data Source
AI summary
A display substrate and a pixel driving circuit, the display substrate includes: a base substrate; a first conductive layer on the base substrate, the first conductive layer including a first signal line, a second signal line, and an additional pad layer spaced apart from each other; and a first electrode on a side of the first conductive layer away from the base substrate, where an orthographic projection of the first electrode on the base substrate and an orthographic projection of the additional pad layer on the base substrate have a second overlapping region, and the first conductive layer further includes a first electrical connection portion, and an orthographic projection of the first electrical connection portion on the base substrate does not overlap an orthographic projection of the second overlapping region on the base substrate.