OLED Display Panel Insulation Layer Segmentation
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Solution Overview
Problem
In OLED display panels, the light emitted from the light emitting region can directly or reflectively affect the thin film transistor in the non-light emitting region, causing electrical leaks and abnormal displays due to insufficient insulation layers between the light emitting assembly and the substrate.
Innovation Solution
The OLED display panel design includes a substrate with sub-pixel areas having a light emitting region and a non-light emitting region, where at most two insulation layers extend from the non-light emitting region into the light emitting region, reducing the number of insulation layers between the light emitting assembly and the substrate to minimize light interference with the thin film transistor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple insulation layers are extended into the light emitting region, then the thin film transistor is better protected from light interference, but the manufacturing complexity and process difficulty increase
Solution Approach 1:
The patent extracts and removes unnecessary insulation layers from the light emitting region. Specifically, the pixel definition layer is removed from the light emitting region to reduce the number of insulation layers, while maintaining the essential insulation function in the non-light emitting region where the thin film transistor is located. This extraction approach protects the thin film transistor from light interference without requiring excessive insulation layers in the light emitting region.
Solution Approach 2:
The patent segments the insulation layer configuration by region. Different numbers of insulation layers are provided in different regions: multiple insulation layers (including buffer layer, gate insulator layer, interlayer dielectric layer, and passivation layer) are maintained in the non-light emitting region to protect the thin film transistor, while fewer insulation layers are extended into the light emitting region. This segmentation allows optimized protection where needed without unnecessary complexity elsewhere.
2Ease of manufacture
If the distance between the light emitting assembly and substrate is reduced, then manufacturing processes like ink-jet printing are facilitated, but light may more easily affect the thin film transistor
Solution Approach 1:
The patent applies local quality by providing different insulation layer configurations in different regions. In the light emitting region where ink-jet printing is applied, fewer insulation layers are provided to facilitate the printing process and improve manufacturing ease. In the non-light emitting region where the thin film transistor is located, multiple insulation layers are maintained to protect against light interference. This local differentiation resolves the contradiction between manufacturing ease and light protection.
Solution Approach 2:
The patent uses the selectively configured insulation layers as an intermediary mechanism. The insulation layers act as a mediator that can be present or absent in different regions: they are present in the non-light emitting region to block light from reaching the thin film transistor, but reduced in the light emitting region to allow easy manufacturing via ink-jet printing. This intermediary approach allows both manufacturing ease and light protection to coexist.
3Ease of manufacture
If fewer insulation layers are provided in the light emitting region, then manufacturing is simplified, but electrical leaks may increase due to insufficient insulation
Solution Approach 1:
The patent applies local quality by differentiating insulation layer configuration between regions. In the light emitting region, fewer insulation layers are provided to simplify manufacturing, while in the non-light emitting region where electrical insulation is critical for the thin film transistor operation, multiple insulation layers (buffer layer, gate insulator layer, interlayer dielectric layer, and passivation layer) are maintained. This ensures electrical insulation reliability is not compromised while achieving manufacturing simplification.
Solution Approach 2:
The patent performs preliminary action by ensuring that essential insulation layers are properly configured in the non-light emitting region before the light emitting region is processed. The buffer layer, gate insulator layer, interlayer dielectric layer, and passivation layer are established to provide electrical insulation for the thin film transistor, and then the pixel definition layer is selectively removed only from the light emitting region. This preliminary establishment of insulation ensures electrical reliability is maintained while allowing subsequent manufacturing simplification.
Data Source
AI summary
An OLED display panel, a method for producing the same and a display device are provided. The OLED display panel includes: a substrate; and a plurality of sub-pixel areas on the substrate, each of the plurality of sub-pixel areas including a light emitting region and a non-light emitting region, wherein a plurality of insulation layers are in the non-light emitting region and a light emitting assembly is in the light emitting region, and wherein at most two insulation layers of the plurality of insulation layers extend from the non-light emitting region into the light emitting region between the light emitting assembly and the substrate, and wherein total number of the plurality of insulation layers in the non-light emitting region is greater than number of the insulation layers extending from the non-light emitting region into the light emitting region between the light emitting assembly and the substrate.