Display Panel Anode Layout for Light-Emitting Layer Uniformity
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Solution Overview
Problem
Current display panels suffer from poor flatness of the anode layer due to surface roughness, leading to uneven thickness of the light emitting layer and subsequent display issues.
Innovation Solution
A display panel design featuring an inorganic layer on the base substrate to planarize the surface, with a thin film transistor layer and anode layer configuration that ensures electrical connection and improved flatness, using a sequence of openings and layers to position the anode layer on the inorganic layer for enhanced uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a planarization layer is formed to planarize the array substrate surface, then the surface flatness is improved, but the surface roughness remains relatively large causing poor anode layer flatness
Solution Approach 1:
The planarization layer is divided into two separate functional layers: an inorganic layer (first planarization layer) for surface planarization and an organic layer (second planarization layer) for additional flattening and protection. This segmentation allows each layer to specialize in different aspects of planarization, with the inorganic layer providing a stable, low-roughness foundation and the organic layer enhancing the overall flatness for the anode layer deposition.
Solution Approach 2:
The inorganic layer serves as an intermediary layer between the array substrate and the anode layer. It acts as a mediator that first planarizes the substrate surface, then provides a stable platform for the organic layer, which in turn creates the optimal flat surface for anode layer deposition. This intermediary structure resolves the contradiction by introducing a intermediate planarization stage.
2Reliability
If the anode layer is deposited on the planarization layer, then electrical connection is achieved, but the thickness uniformity of the light emitting layer is affected due to poor anode layer flatness
Solution Approach 1:
The planarization function is segmented into two layers, allowing the organic layer to specifically address the flatness requirement for uniform light emitting layer deposition, while the inorganic layer handles the primary planarization and electrical connection functions.
Solution Approach 2:
The invention changes the physical and chemical parameters of the planarization layers by using different materials (inorganic vs. organic) with different surface properties. The organic layer provides a smoother surface with better wetting characteristics, enabling more uniform light emitting layer deposition while maintaining electrical connection through the underlying inorganic layer.
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 solution ensures improved flatness and uniformity of the anode layer, addressing the issue of uneven displays by using an inorganic layer for planarization and strategic layer positioning, which enhances the thickness uniformity of subsequent layers.
Implementation Method 1
an inorganic layer (120), a thin film transistor layer (140)... sequentially arranged from bottom to top
Data Source
AI summary
The display panel includes a base substrate, an inorganic layer, a thin film transistor layer, and an anode layer. The inorganic layer is disposed on the base substrate, the thin film transistor layer is disposed on the inorganic layer, the thin film transistor layer is defined with a first opening, and the first opening exposes a part of the inorganic layer. The thin film transistor layer includes a source-drain layer, the anode layer is partially positioned on the part of the inorganic layer exposed by the first opening, and the anode layer is electrically connected to the source-drain layer.