OLED Pixel Defining Layer Accommodation Grooves
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Solution Overview
Problem
Ink-jet printing in OLED technology often results in ink overflow between sub-pixels, leading to color crossing and defects in display devices due to process conditions and equipment fluctuations, which affects the quality and resolution of the display.
Innovation Solution
A display backplate with a pixel defining layer that includes sub-pixel openings and accommodation grooves between them, where the lyophilic layer has a higher affinity for ink, guiding it into the grooves to prevent color crossing, and the lyophobic layer defines the openings to minimize ink overflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If ink-jet printing is used to reduce equipment and material costs, then manufacturing cost is reduced, but ink overflow between sub-pixels occurs leading to color crossing
Solution Approach 1:
The pixel defining layer is segmented into multiple functional regions: a lyophobic region that repels ink and defines sub-pixel openings, and a lyophilic region that attracts ink and forms accommodation grooves. This segmentation allows the ink to be naturally guided and contained within specific areas, preventing overflow between sub-pixels while maintaining the cost advantages of ink-jet printing
Solution Approach 2:
Different regions of the pixel defining layer are given different local properties: the lyophobic layer has ink-repelling characteristics with specific surface tension, while the lyophilic layer has ink-attracting characteristics. This local quality differentiation creates a gradient that guides ink flow into accommodation grooves and prevents unwanted spreading, resolving the contradiction between low-cost printing and high precision
2Manufacturing precision
If accommodation grooves are added to contain ink overflow, then color crossing is prevented, but device structure becomes more complex
Solution Approach 1:
The accommodation groove structure is merged with the pixel defining layer itself, rather than being a separate component. The lyophilic layer is integrated into the pixel defining layer to form the accommodation grooves, combining the functions of ink containment and pixel definition into a single unified structure, thus preventing color crossing without significantly increasing device complexity
Solution Approach 2:
The lyophilic layer acts as an intermediary between the ink and the lyophobic pixel defining layer. It provides a transition zone with accommodation grooves that mediates the ink flow, guiding excess ink into controlled regions and preventing direct contact between adjacent sub-pixel inks, thereby containing overflow without complex mechanical structures
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 reduces process defects, improves display resolution, and enhances production yield by containing ink overflow within the accommodation grooves, thereby preventing color crossing between adjacent sub-pixels.
Implementation Method 1
the lyophilic layer has a higher affinity for ink, guiding it into the grooves to prevent color crossing
Implementation Method 2
the lyophobic layer defines the openings to minimize ink overflow
Data Source
AI summary
A display backplate and a manufacturing method thereof, and a display device are provided. The display backplate includes a base substrate and a pixel defining layer provided on the base substrate, the pixel defming layer defines a plurality of sub-pixel openings, an accommodation groove is provided at a surface of the pixel defining layer facing away from the base substrate, and the accommodation groove is located between two adjacent sub-pixel openings.