OLED Pixel Arrangement for Area Coverage and Drive Current
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Solution Overview
Problem
Existing OLED display technologies face challenges in optimizing sub-pixel arrangements for improved area coverage and reduced drive current, which affects the display's efficiency and lifespan.
Innovation Solution
A novel pixel arrangement is proposed, where first, second, and third sub-pixels are alternately arranged in specific patterns on a display substrate, with varying shapes and distances, allowing for closer packing and efficient use of space, facilitated by a set of masks for precise material deposition during manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If traditional sub-pixel arrangements are used in OLED displays, then the manufacturing process is simple, but the area coverage is limited and drive current is high
Solution Approach 1:
The pixel arrangement is divided into multiple types (first pixel, second pixel, third pixel, fourth pixel) with different sub-pixel compositions and configurations. Each pixel type contains different arrangements of red, green, and blue sub-pixels, allowing the display to segment the overall pixel matrix into diverse functional units that collectively improve area coverage while managing complexity through systematic variation
Solution Approach 2:
Different pixel types employ asymmetric sub-pixel arrangements where the positions, shapes, and areas of red, green, and blue sub-pixels vary across pixel types. For example, first pixels have a specific arrangement while second pixels have a different arrangement, creating asymmetric patterns that maximize space utilization and reduce drive current requirements
2Area of stationary object
If sub-pixels are arranged closer together to increase area coverage, then area coverage improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies different sub-pixel area ratios and positioning configurations to different pixel types based on their local requirements. For instance, red sub-pixels may occupy different area ratios in first pixels versus second pixels, and green or blue sub-pixels may be positioned at different distances from red sub-pixels in different pixel types. This localized optimization allows closer packing overall while maintaining manufacturable precision in each local region
Solution Approach 2:
The pixel arrangement employs dynamic variation in sub-pixel configurations across different pixel types, where the area ratios, shapes, and positions of sub-pixels are adjusted according to the specific pixel type. This dynamic approach allows the system to optimize area coverage in different regions while maintaining manufacturing feasibility through controlled variation rather than uniform high-precision requirements
3Duration of action of stationary object
If drive current is reduced to extend display lifespan, then lifespan improves, but area coverage may be compromised
Solution Approach 1:
The patent changes multiple parameters simultaneously including sub-pixel area ratios, pixel type distributions, and sub-pixel positioning distances to achieve a optimized balance. By adjusting these parameters across different pixel types and their spatial distributions, the system reduces drive current requirements through efficient area utilization while maintaining or improving overall area coverage, thereby extending display lifespan without compromising coverage
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 increased sub-pixel area coverage, reduces drive current, and extends the display's lifespan by allowing for more flexible and efficient pixel pattern design.
Implementation Method 1
The sub-pixels are generally formed by evaporating organic light-emitting materials on an array substrate using a fine metal mask (FMM)
Data Source
AI summary
A pixel arrangement including first groups of sub-pixels arranged in a first direction, each of the first groups including first sub-pixels and third sub-pixels arranged alternately, and second groups of sub-pixels arranged in the first direction, each of the second groups including third sub-pixels and second sub-pixels arranged alternately. The first groups and the second groups are alternately arranged in a second direction perpendicular to the first direction. The first groups and the second groups are arranged to form third groups of sub-pixels arranged in the second direction and 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 of the third groups includes first sub-pixels and third sub-pixels arranged alternately. Each of the fourth groups includes third sub-pixels and second sub-pixels arranged alternately.