Curved Pixel Definition Layers for Uniform OLED Inkjet Printing
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Solution Overview
Problem
Existing OLED display technologies face challenges in achieving uniform film formation and high luminance uniformity during the inkjet printing process, particularly due to the rectangular shape of subpixel regions which can lead to uneven material distribution.
Innovation Solution
The proposed display base plate features a substrate with a first electrode layer and pixel definition layers that divide the substrate into pixel regions with first and second curved surfaces, increasing the width of subpixel regions along the second direction. This design enhances the uniformity of film formation during inkjet printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If rectangular subpixel regions are used in OLED display, then the manufacturing process is simple, but the film formation uniformity and luminance uniformity are poor
Solution Approach 1:
The pixel definition layer is designed with curved surfaces instead of rectangular shapes. Specifically, the top surface includes first curved surfaces and second curved surfaces that are protruded away from the pixel region, creating a curved profile that improves material distribution uniformity during inkjet printing while maintaining manufacturing feasibility through standard photolithography processes.
Solution Approach 2:
The invention introduces vertical dimensionality by creating protruding curved surfaces on the pixel definition layer. This three-dimensional structure allows the layer to extend upward from the substrate plane, forming a curved profile that enhances film formation uniformity without increasing the horizontal footprint of the display device.
2Illumination intensity
If curved surfaces are added to pixel definition layers, then luminance uniformity is improved, but the device structure becomes more complex
Solution Approach 1:
The pixel definition layer incorporates first curved surfaces and second curved surfaces that are smoothly connected and protruded away from the pixel region. This curved configuration ensures uniform material distribution during inkjet printing, leading to improved luminance uniformity across the display while the curvature is achieved through standard manufacturing processes.
Solution Approach 2:
The invention modifies the geometric parameters of the pixel definition layer by introducing curved surfaces with specific profiles. The first and second curved surfaces have controlled curvature radii and heights, transforming the flat rectangular structure into a three-dimensional curved profile that optimizes material flow and distribution during the printing process.
3Manufacturing precision
If the first pixel definition layer is made thicker to improve film formation, then the material distribution improves, but the overall device thickness increases
Solution Approach 1:
The pixel definition layer utilizes vertical protrusions with curved surfaces to enhance material distribution. The first and second curved surfaces extend upward from the substrate plane, creating a three-dimensional profile that improves film formation uniformity without requiring a uniformly thick layer across the entire device, thus maintaining overall thinness.
Solution Approach 2:
The pixel definition layer is designed with non-uniform thickness distribution, where the curved surfaces are protruded only in specific regions above the pixel and subpixel areas. This localized thickening provides enhanced material distribution control where needed, while other regions remain thin, avoiding unnecessary overall device thickness increase.
Data Source
AI summary
A display base plate includes: a substrate (101), a first electrode layer (102) formed on the substrate (101), and a first pixel definition layer (103) and a second pixel definition layer (104) formed on the first electrode layer (102); the first pixel definition layer (103) divides the substrate (101) into a plurality of pixel regions (105), each pixel region (105) includes a plurality of subpixel regions (1050) distributed along a first direction, and two adjacent subpixel regions (1050) are separated by the second pixel definition layer (104); in the first direction, surfaces of each pixel region (105) in contact with the first pixel definition layer (103) include a plurality of first curved surfaces (1061) and a plurality of second curved surfaces (1062), and the first curved surfaces (1061) and the second curved surfaces (1062) are protruded away from the pixel region (105) to which they belong.