Filling Layer Curing for OLED Stability
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Solution Overview
Problem
Conventional top-emission organic electroluminescent devices have low stability and short operating lifespan due to air and moisture ingress through voids formed between color filters and organic electroluminescent elements, and lack of a buffer or filling layer to separate them, leading to potential damage.
Innovation Solution
A pixel structure with a filling layer and sub-pixels having color filter layers, where the transmittance of each sub-pixel is optimized, and a passivation layer is used to prevent air and moisture ingress, with a specific sub-pixel arrangement and black matrix to ensure uniform radiance for curing the filling layer, which fills gaps between color filters and electroluminescent elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If color filters are directly formed on the organic electroluminescent element without a buffer layer, then the device structure is simpler, but air and moisture ingress through voids at the interface reduces stability and operating lifespan
Solution Approach 1:
A buffer layer is introduced as an intermediary component between the color filter and the organic electroluminescent element. This buffer layer fills voids at the interface, preventing air and moisture ingress that would otherwise occur through direct contact structures, thereby improving reliability without significantly increasing overall device complexity
Solution Approach 2:
The buffer layer is positioned in advance between the color filter and electroluminescent element to provide protective cushioning against harmful factors (air and moisture). This preemptive protective structure prevents damage before it occurs, extending operating lifespan while maintaining relatively simple device architecture
2Ease of manufacture
If no filling layer is used to separate color filters from organic electroluminescent elements, then the fabrication process is simpler, but air gaps cause easy damage such as glass substrate fracture
Solution Approach 1:
A filling layer is introduced as a mediator between the color filter and the organic electroluminescent element. This layer eliminates air gaps that would create stress concentration points, thereby preventing glass substrate fracture and improving structural integrity while adding minimal complexity to the fabrication process
Solution Approach 2:
The filling layer is placed in advance between the color filter and electroluminescent element to provide cushioning against mechanical stress. This prevents damage such as glass substrate fracture by distributing stress evenly, thereby strengthening the device without significantly complicating manufacturing
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 enhances the stability and operating lifespan of the organic electroluminescent device by preventing air and moisture ingress, improving structural integrity and display quality.
Implementation Method 1
the transmittances of the color filter layer of the first sub-pixel, the color filter layer of the second sub-pixel, and the color filter layer of the third sub-pixel for a radiance level used for curing the filling layer
Data Source
AI summary
A system for displaying images employing a pixel structure. The pixel structure includes a first sub-pixel, a second sub-pixel, a third sub-pixel, and a filling layer. Particularly, each sub-pixel includes a color filter layer, and an electroluminescent element corresponding to the color filter layer. The transmittances of the color filter layers of the first sub-pixel, the second sub-pixel, and third sub-pixel, for a radiance level used for curing the filling layer, are determined according to the following equation: transmittance of the color filter layer of the first sub-pixel>transmittance of the color filter layer of the second sub-pixel>transmittance of the color filter layer of the third sub-pixel. Further, the distance between the first and second sub-pixels is greater than that between the first and third sub-pixels.