OLED Panel Overcoat Layer Local Quality Optimization
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Solution Overview
Problem
Organic light emitting display panels face reduced panel efficiency and lifespan due to the high transmittance reduction of blue and white sub-pixels caused by the overcoat layer, which affects the overall performance of the device.
Innovation Solution
The organic light emitting display panel design includes red, green, and blue sub-pixel regions with an overcoat layer only in the red and green sub-pixel regions, and no overcoat layer in the blue and white sub-pixel regions, along with a buffer layer in specific areas to enhance efficiency and lifespan, using a substrate with red, green, and blue color filters and organic emitting cells in each region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an overcoat layer is formed on color filters in all sub-pixel regions, then the structural integrity and planarity of the display panel is improved, but the transmittance of blue and white sub-pixels is reduced at a relatively high rate
Solution Approach 1:
The overcoat layer is selectively formed only in red and green sub-pixel regions, while blue and white sub-pixel regions are left without the overcoat layer. This local differentiation allows the overcoat to provide structural support where needed (R and G regions) while maintaining high light transmittance in regions where the overcoat would cause excessive attenuation (B and W regions).
Solution Approach 2:
The display panel is segmented into different regions with different overcoat layer configurations. Red and green sub-pixel regions have the overcoat layer formed on them, while blue and white sub-pixel regions do not have the overcoat layer. This segmentation strategy optimizes both structural integrity and optical performance for different pixel types.
2Stability of the object's composition
If an overcoat layer is formed on color filters, then the panel structure is stabilized, but the lifespan of blue and white sub-pixels is reduced due to high current density
Solution Approach 1:
The overcoat layer configuration is locally optimized for different sub-pixel types. By excluding the overcoat layer from blue and white sub-pixel regions, the design reduces the current density burden on these pixels, thereby extending their operational lifespan while maintaining overall panel structural stability through the presence of the overcoat in red and green regions.
3Ease of manufacture
If an overcoat layer is formed uniformly across all sub-pixel regions, then the manufacturing process is simplified, but the panel efficiency is reduced due to transmittance loss in blue and white sub-pixels
Solution Approach 1:
The manufacturing process is optimized by implementing local quality differentiation in the overcoat layer formation. The overcoat layer is applied selectively to red and green sub-pixel regions while omitting it from blue and white regions, thereby achieving high panel efficiency through improved transmittance in critical regions while maintaining reasonable manufacturing complexity through standardized processing techniques.
Data Source
AI summary
An organic light emitting display panel with improved efficiency and lifespan and a method of manufacturing the same are disclosed. The organic light emitting display panel according to the present invention includes a substrate having red, green, blue, and white sub-pixel regions, red, green, and blue color filters respectively formed in the red, green, and blue sub-pixel regions, an overcoat layer that is formed in the red and green sub-pixel regions except for the blue and white sub-pixel regions or is formed in the sub-pixel regions such that a thickness of the overcoat layer in the red and green sub-pixel regions is greater than a thickness of the overcoat layer in the blue and white sub-pixel regions; and organic emitting cells respectively formed in the red, green, blue, and white sub-pixel regions.