Inorganic Insulating Layer Structure for OLED Moisture Protection
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Solution Overview
Problem
Organic light emitting display devices are vulnerable to moisture and oxygen, which can damage the organic light emitting layer, requiring effective protection measures to prevent penetration and improve manufacturing productivity.
Innovation Solution
A display device structure incorporating a transistor layer, emission layer, and insulating layers with specific thickness variations and materials, including inorganic materials for protection, and a manufacturing method that forms these layers without using a mask to reduce shadow effects and enhance productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic layers are used to protect the organic light emitting layer from moisture and oxygen, then reliability is improved, but device complexity increases
Solution Approach 1:
The protective structure is divided into multiple inorganic layers with different thicknesses (first insulating layer with first thickness, second insulating layer with second thickness greater than first thickness). This segmentation allows each layer to perform specific protective functions while collectively providing comprehensive protection against moisture and oxygen penetration.
Solution Approach 2:
The patent employs composite material structures by combining multiple inorganic insulating layers with different thicknesses and properties. The first and second insulating layers form a composite protective system that leverages the advantages of each layer, providing enhanced barrier properties against moisture and oxygen while maintaining structural integrity.
2Manufacturing precision
If mask processes are used in manufacturing to form precise insulating layers, then manufacturing precision is improved, but productivity decreases
Solution Approach 1:
The patent extracts and eliminates the mask process from the manufacturing sequence. By forming the first and second insulating layers without requiring mask alignment and deposition steps, the manufacturing process is simplified significantly. This removal of the mask process directly addresses the contradiction by maintaining thickness control through alternative means while dramatically improving productivity.
Solution Approach 2:
The insulating layers are formed as preliminary structures before final device assembly, with their thicknesses predetermined by the deposition process parameters rather than mask-defined patterns. This preliminary formation approach allows subsequent processing to proceed more quickly without compromising the protective function of the insulating layers.
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 effectively protects the organic light emitting layer from moisture and oxygen, improving the display device's reliability and reducing manufacturing costs by eliminating the need for mask-related processes, thereby enhancing productivity and reducing dead space.
Implementation Method 1
penetration of moisture and oxygen into the organic light emitting layer may be prevented by using an inorganic layer included in the organic light emitting display device
Data Source
AI summary
A display device comprises a transistor layer that includes a display area and a pad area disposed adjacent to the display area, an emission layer disposed in the display area on the transistor layer, a first display insulating layer disposed on the emission layer, and an insulating layer disposed in the pad area on the transistor layer, the insulating layer and the first display insulating layer including a same material, and the insulating layer having a step.