OLED Pixel-Defining Layer Structure for Luminance
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Solution Overview
Problem
In small organic light-emitting display devices with high resolution, the high degree of pixel integration results in reduced pixel size, leading to lower luminance due to the pixel-defining layer covering the edges of the electrodes, thereby reducing the size of each pixel and affecting light emission.
Innovation Solution
The organic light-emitting display device incorporates a wider second pixel-defining layer compared to the first pixel-defining layer, along with a low refractive index medium layer between color filters, and a reflective electrode structure to enhance luminance and prevent color mixture, allowing for maximized pixel size and improved light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel integration degree is increased to achieve high resolution, then display resolution is improved, but pixel size is reduced leading to lower luminance
Solution Approach 1:
The patent applies dimensionality change by forming a three-dimensional pixel-defining layer structure with multiple layers (first pixel-defining layer and second pixel-defining layer) instead of using a single flat layer. This vertical stacking approach allows the pixel aperture to be maximized in the planar direction while maintaining effective pixel definition, thereby increasing the light-emitting area and luminance without compromising display resolution.
Solution Approach 2:
The patent implements nesting by placing the first pixel-defining layer and second pixel-defining layer in a stacked configuration where the second layer is positioned on top of the first layer. This nested structure allows both layers to work together to define the pixel boundaries while maximizing the overall pixel aperture area, thus improving luminance while maintaining high resolution.
2Measurement precision
If pixel size is reduced to increase pixel integration, then display resolution is improved, but light emission area is reduced
Solution Approach 1:
The patent transitions from a two-dimensional pixel-defining approach to a three-dimensional structure by stacking multiple pixel-defining layers vertically. This allows the light emission area in the planar direction to be maximized while the vertical layers provide effective pixel boundary definition, thus increasing the light emission area without reducing display resolution.
Solution Approach 2:
The patent segments the pixel-defining function into multiple layers (first pixel-defining layer and second pixel-defining layer) rather than using a single layer. This segmentation allows each layer to contribute to pixel definition while the overall structure maximizes the light emission area, resolving the contradiction between resolution and emission area.
3Device complexity
If single-layer pixel-defining structure is used, then device complexity is low, but pixel aperture is limited reducing luminance
Solution Approach 1:
The patent uses nesting by stacking the first pixel-defining layer and second pixel-defining layer vertically, where the second layer is positioned on top of the first layer. This nested configuration maximizes the pixel aperture area without requiring a completely new structure, thus improving luminance while maintaining relatively simple device complexity.
Solution Approach 2:
The patent moves from a single-layer two-dimensional structure to a multi-layer three-dimensional structure. This dimensional change allows the pixel aperture to be expanded in the planar direction while the vertical stacking provides effective pixel definition, thereby improving luminance without excessive increase in device 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 configuration maximizes pixel size, enhances luminance by preventing light from adjacent pixels from interfering, and increases the overall light output from each pixel, addressing the issue of reduced luminance in high-resolution displays.
Implementation Method 1
a low refractive index medium layer between adjacent color filters, the low refractive index medium layer having a refractive index lower than respective refractive indexes of each of the plurality of color filters
Data Source
AI summary
An organic light-emitting display device and a method of manufacturing the same are provided. An organic light-emitting display device includes: first electrodes, a first pixel-defining layer configured to divide the first electrodes, a second pixel-defining layer on the first pixel-defining layer, an organic light-emitting layer on a first electrode among the first electrodes, and a second electrode on the organic light-emitting layer, wherein a width of the second pixel-defining layer is wider than a width of the first pixel-defining layer.