OLED Subpixel Segmentation for Lifespan Compensation
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Solution Overview
Problem
The lifespan of light-emitting materials in OLED display devices is limited, leading to decreased brightness and affected display effects over time.
Innovation Solution
A display panel design featuring a substrate with a pixel defining layer that includes hydrophilic and hydrophobic organic material layers, where each subpixel is composed of a primary and secondary pixel driven independently, with the layers disposed in a specific configuration to enhance brightness and compensate for luminescence lifespan, and a manufacturing method that forms these layers on a substrate to facilitate mass production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light-emitting materials are used in OLED subpixels, then display brightness and color quality are improved, but the lifespan of the subpixels is limited and brightness decreases over time
Solution Approach 1:
Each subpixel is divided into a primary pixel and a secondary pixel that are independently driven by different driving circuits. The primary pixel is driven by a first driving circuit and the secondary pixel is driven by a second driving circuit, allowing independent control and compensation for lifespan differences between the two pixels within the same subpixel.
2Ease of manufacture
If multiple pixel defining layers with different materials are used, then printing difficulty of luminescent materials is reduced, but the device structure becomes more complex
Solution Approach 1:
The pixel defining layer is constructed with three distinct layers (first, second, and third pixel defining layers) having different hydrophilic-hydrophobic characteristics. The first and third pixel defining layers have first hydrophilic-hydrophobic characteristics, while the second pixel defining layer has second hydrophilic-hydrophobic characteristics that are different from the first. This local variation in material properties facilitates the printing process of luminescent materials by providing appropriate surface characteristics at different locations.
Data Source
AI summary
A display panel includes a substrate, a pixel defining layer defining a plurality of subpixel areas, and a plurality of subpixels. The plurality of subpixels are disposed in the plurality of subpixel areas in one-to-one correspondence. Each of the plurality of subpixels includes a primary pixel and a secondary pixel surrounding the primary pixel. The primary pixel and the secondary pixel are independently driven by different driving circuits, respectively. By configuring the subpixels into the primary pixel and the secondary pixel surrounding the primary pixel and driving the primary pixel and the secondary pixel independently, it is beneficial to adjust brightness of the plurality of subpixels and compensate for luminescence lifespans of the plurality of subpixels.