OLED Substrate Driving Transistor Electrode Design
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Solution Overview
Problem
The complexity and cost of manufacturing organic light-emitting display substrates are increased due to the need for multiple masks and layers, which can lead to decreased luminance and uniformity in display due to light passing through numerous layers, and potential electrical conductivity issues.
Innovation Solution
An organic light-emitting display substrate design that includes a driving transistor with a first insulating layer having via holes for source and drain electrodes, where the drain electrode has distinct regions with a metal and transparent conductive layer stack, reducing the number of masks and layers required, enhancing electrical conductivity and luminance by minimizing light passage through layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple masks and layers are used in the manufacturing process, then the manufacturing precision and electrical conductivity are improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the source electrode and drain electrode into a single patterned layer, where different regions of the same layer serve different functions. This merging reduces the number of separate masks and deposition steps required, simplifying the manufacturing process while maintaining proper electrical conductivity through the patterned design.
Solution Approach 2:
The patterned electrode layer serves multiple functions simultaneously: it acts as both the source electrode and drain electrode, and also provides electrical connection to the active layer. This multi-functionality eliminates the need for separate structures for each function, reducing overall device complexity while maintaining manufacturing precision.
2Reliability
If multiple layers are used in the display substrate, then the electrical conductivity and structural integrity are improved, but the luminance and display uniformity decrease due to light passing through numerous layers
Solution Approach 1:
The patent extracts and eliminates unnecessary intermediate layers from the display structure, particularly removing redundant insulating layers and via structures that do not contribute to functional performance. This extraction maintains the essential structural integrity for electrical conductivity while reducing the total number of layers that light must traverse, thereby improving luminance.
Solution Approach 2:
The patent segments the electrode structure into a patterned single layer with distinct functional regions rather than using multiple separate layers. This segmentation achieves the necessary electrical connectivity and structural support with fewer material layers, allowing more light to pass through and improving display uniformity.
3Manufacturing precision
If multiple masks are used in the manufacturing process, then the manufacturing precision is improved, but the productivity and manufacturing efficiency decrease
Solution Approach 1:
The patent merges multiple electrode patterning steps into a single mask step, where one mask defines both the source and drain electrode regions. This combining reduces the total number of mask alignment operations required, improving manufacturing efficiency and productivity while maintaining pattern alignment precision through the simplified process.
Data Source
AI summary
The present application provides an organic light emitting display substrate and a method of fabricating the same. The organic light emitting display substrate includes: a base substrate; and a driving transistor provided on the base substrate, wherein the driving transistor includes: an active layer; a first insulating layer having at least one sub-layer covering the active layer and having a first via hole therein; and a source electrode and a drain electrode disposed on a side of the first insulating layer distal to the base substrate, and connected to the active layer through the first via hole in the first insulating layer.