Photosensitive Pixel Defining Layer for High-Resolution Displays
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Solution Overview
Problem
Existing organic light emitting display devices face challenges in achieving high resolution and long lifespan due to pixel size adjustments affecting luminance and driving voltage, and lack a suitable replacement for polarizing films that are not flexible.
Innovation Solution
A method is developed to form a pixel defining layer on an electrode substrate using a photosensitive composition, specifying pixel sizes and shapes for red, green, and blue pixels, and including a photosensitive composition with specific components to enhance resolution and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pixel size is reduced to achieve high resolution, then manufacturing precision is improved, but luminance decreases and driving voltage increases which reduces device lifespan
Solution Approach 1:
The patent applies parameter changes by optimizing the photosensitive composition formulation (including specific ratios of monomers, photoinitiators, and colorants) to enable precise control of pixel dimensions while maintaining adequate luminance output. This allows the pixel size to be controlled within specific ranges (e.g., 50-100 nm for blue pixels, 60-120 nm for green pixels, 70-130 nm for red pixels) without sacrificing display performance or device longevity.
2Illumination intensity
If pixel size is increased to maintain luminance, then luminance is improved and driving voltage decreases, but manufacturing precision deteriorates making high resolution difficult to achieve
Solution Approach 1:
The patent utilizes parameter changes by adjusting the photosensitive composition parameters (monomer types, photoinitiator concentration, colorant particle size and concentration) to achieve optimal balance between pixel size and luminance. This enables formation of pixels within specific size ranges that maintain adequate luminance output while achieving high resolution displays.
Solution Approach 2:
The patent employs composite materials by formulating a photosensitive composition that combines multiple components (monomers, photoinitiators, colorants, and additives) in specific ratios. This composite approach allows for precise control of pixel characteristics including size, color, and luminance, enabling simultaneous achievement of high resolution and adequate display performance.
3Object-affected harmful factors
If polarizing film is used to block reflected light, then light blocking performance is improved, but flexibility is lost making it unsuitable for flexible devices
Solution Approach 1:
The patent applies mechanics substitution by replacing the mechanical/polarizing film-based light blocking system with a photochemical approach using photosensitive composition. The composition undergoes photopolymerization upon light exposure to form a crosslinked network that provides both light blocking functionality and flexibility, eliminating the need for rigid polarizing films while maintaining the ability to block reflected light.
Solution Approach 2:
The patent utilizes parameter changes by modifying the chemical composition and crosslinking density of the photosensitive material to achieve optimal balance between light blocking performance and flexibility. By adjusting parameters such as photoinitiator concentration, monomer type, and crosslinking conditions, the material can provide effective reflected light blocking while maintaining the flexibility needed for flexible display devices.
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 method enables high-resolution displays with vivid colors and increased reliability by optimizing pixel sizes and compositions, improving luminance and extending device lifespan.
Implementation Method 1
the pixel defining layer is formed by photopolymerization of a photosensitive composition
Data Source
Figure 1
AI summary
An object of the present disclosure is to implement a coloring pattern with a high optical density on an electrode substrate to improve display reliability and lifetime as well as vivid colors as a display with high resolution. That is, the pixel having a size within the range according to the present disclosure can implement high resolution of a Black PDL and can manufacture a display with high luminance and long lifetime according to driving voltage and current.