OLED Pixel Arrangement Using Stacked Sub-Pixel Layers
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Solution Overview
Problem
Existing OLED display pixel arrangements face challenges in achieving a compact and efficient sub-pixel arrangement that maximizes individual sub-pixel area while maintaining optimal drive current and display element lifetime.
Innovation Solution
A novel pixel arrangement is proposed, where first, second, and third sub-pixels are alternately arranged in specific directions with defined minimum distances and orientations, allowing for a more compact and uniform distribution, facilitated by using a set of masks to evaporate and deposit electroluminescent materials onto a display substrate, forming the sub-pixels with precise patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If sub-pixels are arranged in a conventional matrix pattern, then manufacturing process is simple, but sub-pixel area is limited and drive current is high
Solution Approach 1:
The patent transitions from a conventional two-dimensional matrix arrangement to a five-dimensional stacked arrangement. Sub-pixels are distributed across multiple layers (first, second, and third layers) with different spatial coordinates, enabling increased sub-pixel area while maintaining compact overall structure. Each sub-pixel group contains sub-pixels at different heights, creating a three-dimensional pixel structure that maximizes area utilization.
Solution Approach 2:
The patent implements a nested structure where multiple sub-pixels are arranged within compact pixel regions across different layers. The first, second, and third sub-pixels are nested within overlapping horizontal and vertical ranges, creating a space-efficient configuration that increases effective sub-pixel area without proportionally increasing the overall pixel area.
2Use of energy by moving object
If sub-pixels are packed closer together, then drive current is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent segments the pixel structure into multiple layers, with each layer containing specific sub-pixels at different vertical positions. This segmentation allows sub-pixels to be positioned at optimized intervals in the vertical dimension, maintaining appropriate spacing for manufacturing while achieving closer effective packing through the stacked configuration. The electroluminescent materials are deposited in separate manufacturing steps for each layer, enabling precise control of sub-pixel positions.
Solution Approach 2:
By introducing the vertical dimension through multiple stacked layers, the patent achieves closer effective sub-pixel packing without requiring extremely tight horizontal or vertical spacing within each layer. The sub-pixels are distributed in three-dimensional space, allowing optimized spacing that balances drive current reduction with manufacturability.
3Duration of action of stationary object
If sub-pixel area is increased, then display element lifetime is extended, but pixel density is reduced
Solution Approach 1:
The patent uses a nested arrangement where multiple sub-pixels are contained within compact overlapping regions across different layers. This nesting enables increased sub-pixel area for extended lifetime while maintaining high pixel density through efficient space utilization. The sub-pixels are arranged to maximize area within the constraints of the overall pixel region.
Solution Approach 2:
By utilizing the vertical dimension with stacked layers, the patent achieves increased sub-pixel area without proportionally increasing the horizontal pixel pitch. The five-dimensional arrangement (three spatial dimensions plus two additional degrees of freedom in layer positioning) enables higher pixel density compared to conventional two-dimensional arrangements with equivalent sub-pixel areas.
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 arrangement enables a reduced drive current, increased sub-pixel area, and extended display element lifetime by allowing for closer sub-pixel packing under controlled manufacturing conditions, enhancing display performance and efficiency.
Implementation Method 1
using a fine metal mask (FMM)... evaporating an organic light-emitting material onto an array substrate
Implementation Method 2
evaporating an organic light-emitting material onto an array substrate using a fine metal mask (FMM)
Data Source
AI summary
A pixel arrangement includes a plurality of first groups of sub-pixels arranged in a first direction, each first group including first sub-pixels and third sub-pixels arranged alternately. A plurality of second groups of sub-pixels are arranged in the first direction, each second group including third sub-pixels and second sub-pixels alternately arranged. The first groups and the second groups are alternately arranged in a second direction intersecting the first direction. The first groups and the second groups are arranged to form a plurality of third groups of sub-pixels arranged in the second direction and a plurality of fourth groups of sub-pixels arranged in the second direction. The third groups and the fourth groups are alternately arranged in the first direction, each third group including first sub-pixels and third sub-pixels alternately arranged, each fourth group including third sub-pixels and second sub-pixels alternately arranged.