Sub-Pixel Electrode Layout for Precise Light-Emitting Element Alignment
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Solution Overview
Problem
Existing display device fabrication processes are inefficient, with separate processes for forming pixel circuit components and emission components leading to increased complexity and misalignment of light-emitting elements.
Innovation Solution
A display device design where the pixel circuit and emission components share a common layer structure, with transistors and light-emitting elements having electrodes in the same layer, and a bank structure to define emission areas, allowing for simultaneous alignment and connection of light-emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate processes are used for forming pixel circuit components and emission components, then each component can be formed with dedicated optimization, but the fabrication process complexity increases and misalignment of light-emitting elements occurs
Solution Approach 1:
The patent merges the formation of pixel circuit components and emission components into a single integrated process. The active pattern, source electrode, drain electrode, first electrode, and second electrode are all formed in the same layer, allowing simultaneous fabrication of both circuit and emission components. This integration eliminates the need for separate dedicated processes, reducing overall process complexity while maintaining alignment precision through unified process control.
Solution Approach 2:
The patent implements multi-functionality by using the same layer structure and formation process for both pixel circuit components (transistor electrodes) and emission components (light-emitting element electrodes). The active pattern, source electrode, drain electrode, first electrode, and second electrode share a common formation process, allowing the structure to serve dual purposes: electrical circuit functionality and light emission functionality. This universal approach reduces process complexity while ensuring precise alignment.
2Productivity
If separate processes are used for forming pixel circuit components and emission components, then each component can be independently optimized, but the overall fabrication efficiency decreases
Solution Approach 1:
The patent combines the fabrication of pixel circuit components and emission components into a single integrated process step. By forming the active pattern, source electrode, drain electrode, first electrode, and second electrode all in the same layer simultaneously, the patent eliminates the need for sequential separate processes. This merging approach directly increases fabrication efficiency by reducing the total number of process steps and decreasing overall fabrication time.
Solution Approach 2:
The patent ensures continuous useful action by maintaining a unified formation process that continuously creates both circuit and emission components without interruption. The single-layer integration allows the fabrication process to proceed continuously, forming all necessary electrodes and patterns in one go, rather than pausing between separate processes for circuit components and emission components. This continuity maximizes productivity and minimizes total fabrication time.
3Reliability
If multiple separate processes are used for forming different components, then each component can be precisely controlled, but the number of process steps increases
Solution Approach 1:
The patent merges the formation of multiple components (active pattern, source electrode, drain electrode, first electrode, second electrode) into a single integrated process step. By forming all these elements in the same layer simultaneously, the patent reduces the number of process steps from multiple separate formation processes to one unified process. This integration maintains reliability through consistent process conditions while significantly reducing process complexity.
Solution Approach 2:
The patent implements a universal formation process that creates both pixel circuit components and emission components using the same process steps. The active pattern, source electrode, drain electrode, first electrode, and second electrode are all formed through a single multi-functional process, eliminating the need for separate dedicated processes for each component type. This universal approach reduces the number of process steps while maintaining high reliability through process consistency.
Data Source
AI summary
A display device may include a sub-pixel having a first area and a second area. The sub-pixel may include: a pixel circuit component in the first area, and including a transistor on a substrate; and an emission component in the second area, and including a light-emitting element, and a first electrode and a second electrode electrically connected to the light-emitting element. The transistor may include an active pattern located on the substrate, a source electrode connected to a first side of the active pattern, a drain electrode connected to a second side of the active pattern, and a gate electrode located on the active pattern. The active pattern, the source electrode, the drain electrode, the first electrode, and the second electrode may be in a same layer.