OLED Substrate with Photo-Induced Deforming Particles
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Solution Overview
Problem
OLED display panels face issues with leakage current due to holes draining from one sub-pixel to adjacent sub-pixels through the organic functional layer, leading to color defects and light leakage, which affect the display quality.
Innovation Solution
A display substrate with a pixel defining layer containing photo-induced deforming particles is used, where the organic functional layer is formed with these particles that deform under specific light irradiation, creating bulges and breaking at these points to prevent current leakage between sub-pixels, and the layer is designed with a monocolor or white organic light emitting layer and additional transport layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the organic functional layer is formed continuously over the pixel defining layer, then the manufacturing process is simple, but leakage current occurs between adjacent sub-pixels causing color defects and light leakage
Solution Approach 1:
The organic functional layer is segmented into multiple isolated parts corresponding to respective sub-pixels, with spacing between parts. This segmentation prevents hole draining from one sub-pixel to adjacent sub-pixels, eliminating leakage current and color defects while maintaining manufacturing simplicity through a single-layer formation process.
Solution Approach 2:
The pixel defining layer is designed with different local properties: regions with opening areas allow organic functional layer formation, while regions without opening areas prevent organic functional layer formation. This local quality differentiation creates natural isolation between sub-pixels, preventing leakage current while simplifying the manufacturing process.
2Reliability
If photo-induced deforming particles are used to create bulges in the organic functional layer, then sub-pixel isolation is improved, but the device complexity increases
Solution Approach 1:
The patent replaces complex mechanical isolation structures with photo-induced deforming particles that create temporary bulges during manufacturing. These bulges provide mechanical isolation between sub-pixels during the formation process, but the particles are consumed and do not remain in the final product, thus achieving sub-pixel isolation without increasing device complexity.
Solution Approach 2:
Photo-induced deforming particles are introduced into the pixel defining layer before organic functional layer formation. These particles preliminarily create the necessary isolation structure (bulges) during the manufacturing process, which then disappear after serving their purpose, achieving isolation without permanent structural 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 solution effectively prevents leakage current and improves display quality by ensuring proper isolation between sub-pixels, reducing cross-color defects and light leakage, thereby enhancing the overall performance of the OLED display.
Implementation Method 1
irradiating a partial area of the pixel defining layer with light, until the photo-induced deforming particles in an irradiation area deform to form bulges throughout the organic functional layer to make the organic functional layer break at positions of the bulges
Data Source
AI summary
The present disclosure discloses a display substrate, a production method thereof and a display device. The display substrate includes: a base substrate, a pixel defining layer located on the base substrate, and an organic functional layer located on the pixel defining layer, where the pixel defining layer has opening areas for defining light emitting areas of respective sub-pixels, and contains photo-induced deforming particles; and the organic functional layer covers the opening areas and includes a plurality of parts corresponding to the respective sub-pixels one by one, and the plurality of parts are spaced from each other.