OLED Light Reflecting Unit Merged with Gate Electrode
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Solution Overview
Problem
The manufacturing process of organic light emitting display devices is complex and costly due to the need for multiple mask operations, which increases production time and costs, while existing devices struggle with light efficiency.
Innovation Solution
The design includes a substrate with a light reflecting unit that covers the side and top of the first electrode layer, formed using a metal material the same as the gate electrode, to enhance light emission efficiency, and a method involving multiple mask processes to form the necessary layers and patterns, including a light reflecting unit that surrounds the organic light emitting layer to direct light towards the rear surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple mask operations are used to form the necessary layers and patterns, then manufacturing precision is improved, but device complexity and production cost increase
Solution Approach 1:
The patent combines the gate electrode and light reflecting unit into a single metal layer formation step. The metal layer is patterned to simultaneously create both the gate electrode over the active layer and the light reflecting unit over the electrode layer, reducing the number of mask operations from multiple separate steps to a single integrated step, thereby simplifying the manufacturing process while maintaining pattern precision
Solution Approach 2:
The metal layer serves dual functions: as the gate electrode for transistor operation and as the light reflecting unit for enhancing light emission. This multi-functional design eliminates the need for separate structures and manufacturing steps for each function, reducing process complexity while achieving both electrical and optical performance requirements
2Manufacturing precision
If multiple mask operations are used to form the necessary layers and patterns, then manufacturing precision is improved, but productivity decreases
Solution Approach 1:
The patent merges the formation of the gate electrode and light reflecting unit into a single mask operation step. Instead of performing multiple sequential mask operations to create these structures, the invention uses one patterned metal layer formation step to create both features simultaneously, thereby maintaining manufacturing precision while significantly reducing production time and improving productivity
3Use of energy by moving object
If a light reflecting unit is added to cover the side and top of the first electrode layer, then light efficiency is improved, but device complexity increases
Solution Approach 1:
The patent merges the light reflecting unit with the gate electrode structure by forming both from the same patterned metal layer. The metal layer is designed to extend over the electrode layer in specific regions to create the light reflecting unit while simultaneously serving as the gate electrode, thereby improving light efficiency without adding separate structural components or increasing device complexity
Solution Approach 2:
The metal layer performs multiple functions: it acts as the gate electrode for transistor control, serves as a reflective surface to enhance light emission from the organic light emitting layer, and provides structural support. This multi-functional integration improves light efficiency while avoiding the need for additional dedicated light reflecting components that would increase device complexity
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 configuration simplifies the manufacturing process, reduces production costs, and significantly improves light efficiency by effectively guiding and reflecting light emitted from the organic light emitting layer towards the rear surface, enhancing the overall performance of the organic light emitting display device.
Implementation Method 1
a light reflecting unit covering a side and a part of top of the first electrode layer
Data Source
AI summary
An organic light emitting display device including: a substrate; an active layer formed on the substrate; a first insulation film disposed on the substrate to cover the active layer; a transistor including a gate electrode disposed at a location corresponding to the active layer with the first insulation film in between, and source and drain electrodes electrically connected to the active layer; a first electrode layer disposed on the substrate and electrically connected to any one of the source and drain electrodes of the transistor; a second electrode layer formed on the first electrode layer; an organic light emitting layer disposed between the first electrode layer and the second electrode layer; and a light reflecting unit covering a side and a part of top of the first electrode layer.