OLED Anode and Active Layer Integration via Transparent Oxide Semiconductor
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Solution Overview
Problem
The manufacturing process of conventional OLED devices is complex, time-consuming, and costly due to the need for multiple masks in patterning operations, particularly for producing color filters and anodes.
Innovation Solution
An organic electroluminescent display device with a thin film transistor and organic electroluminescent structure where the active layer and anode are made of transparent oxide semiconductor material, allowing them to be produced in the same layer through a single patterning process, and a metal reflective layer is integrated with the gate electrode to simplify the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple masks are used for patterning color filters and anodes separately, then manufacturing precision is improved, but device complexity and production time increase
Solution Approach 1:
The patent combines the anode layer and active layer into a single transparent oxide semiconductor layer that is patterned using one mask. This merging of layers and patterning steps reduces the number of masks required while maintaining manufacturing precision through the inherent material properties and single-step patterning process.
Solution Approach 2:
The transparent oxide semiconductor material serves multiple functions: it acts as both the anode (electron injection layer) and the active layer (semiconductor channel) in the OLED device. This multi-functionality eliminates the need for separate patterning of these layers, reducing production complexity while maintaining precision.
2Manufacturing precision
If multiple patterning steps are used for producing anodes and color filters, then manufacturing precision is improved, but productivity decreases
Solution Approach 1:
The patent merges the anode and active layer into a single layer structure that can be patterned in one step. This combination eliminates multiple sequential patterning operations, thereby improving productivity while maintaining the necessary manufacturing precision through the unified layer design.
Solution Approach 2:
The transparent oxide semiconductor layer is prepared in advance with the dual functionality of serving as both anode and active layer. This preliminary preparation allows subsequent single-step patterning to define both structures simultaneously, improving production efficiency without sacrificing precision.
3Manufacturing precision
If separate production processes are used for active layer and anode, then manufacturing precision is improved, but loss of time increases
Solution Approach 1:
The patent combines the active layer and anode into a single transparent oxide semiconductor layer, eliminating the need for separate production processes and intermediate alignment steps. This merging reduces production time while maintaining precision through the inherent uniformity of the single-layer structure.
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
This approach simplifies the production process, reduces costs, and shortens production time by eliminating the need for additional patterning steps and using fewer masks, thereby improving efficiency.
Implementation Method 1
performing the plasma treatment on the oxide semiconductor material may increase concentration of carriers therein
Data Source
AI summary
Disclosed is an organic electroluminescent display device, a method for manufacturing the same and a display apparatus. The organic electroluminescent display device comprises: a substrate; a thin film transistor disposed on the substrate and including a gate electrode and an active layer insulated with each other, and a source electrode and a drain electrode connected with the active layer; and an organic electroluminescent structure disposed on the substrate and including an anode, a luminescent layer and a cathode stacked sequentially, the anode and the drain electrode being electrically connected with each other. The anode and the active layer are disposed in the same layer. The active layer is made of a transparent oxide semiconductor material. The anode is made of the transparent oxide semiconductor material undergone a plasma treatment. When producing the OLED device, the active layer and the anode may be simultaneously produced only by changing the pattern of the corresponding mask without additional patterning processes for producing the anodes, thereby simplifying process steps and saving production costs.