OLED Sub-Pixel Arrangement for 460 PPI Resolution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current OLED display technologies are limited by the precision of metal masks used in evaporating organic materials, resulting in a maximum display resolution of 200-250 pixels per inch (PPI), which hinders the competitiveness of OLED products.
Innovation Solution
The OLED display employs a substrate with pixel electrodes arranged in specific patterns and distances to define sub-pixels, allowing for improved display resolution by using conventional metal masks to evaporate organic materials, with sub-pixels emitting blue, red, and green light, and optimizing distances between them for symmetrical and efficient light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional metal masks are used to evaporate organic materials, then manufacturing process is simple and cost-effective, but display resolution is limited to 200-250 PPI
Solution Approach 1:
The pixel electrode is divided into multiple independent sub-pixel electrodes (first sub-pixel electrode, second sub-pixel electrode, third sub-pixel electrode, fourth sub-pixel electrode) with different patterns. Each sub-pixel electrode can be independently controlled to emit light, allowing the system to achieve higher display resolution (460 PPI) by utilizing the combined output of multiple sub-pixels within each pixel region, while still using conventional metal masks for manufacturing.
2Manufacturing precision
If pixel electrodes are arranged with specific patterns to improve display resolution, then display resolution increases to 460 PPI, but manufacturing precision requirements increase
Solution Approach 1:
Different sub-pixel electrodes are designed with asymmetric patterns relative to each other. The first sub-pixel electrode has a specific pattern, the second sub-pixel electrode has a different pattern, and similarly for the third and fourth sub-pixel electrodes. This asymmetric arrangement allows each sub-pixel to be clearly distinguished and positioned, achieving 460 PPI resolution while maintaining compatibility with conventional metal mask manufacturing processes that have limited precision.
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 approach enhances the display resolution to 460 PPI, improving the competitiveness of OLED products by ensuring symmetrical and efficient light emission from sub-pixels while maintaining mechanical strength and tolerance in the manufacturing process.
Implementation Method 1
The illuminance of the OLED is determined by the electric current flowing from the anode to the cathode. Therefore, in order to improve the illuminance of an OLED, a large driving voltage should be applied thereto so as to increase the electric current passing therethrough and enable the formation of an exciton, i.e. a recombination of the 'electron-hole'.
Implementation Method 2
The manufacturing of an OLED display involves the use of a metal mask when evaporating organic materials.
Data Source
AI summary
An OLED display is disclosed, which includes a substrate and a plurality of pixel groups arranged on the substrate. Each pixel group includes a first, a second, a third and a fourth sub-pixel. Arrangements of the first, second, third and fourth sub-pixels in two neighboring pixel groups are symmetrical with each other. In addition, the distance between the third sub-pixels and the distance between the fourth sub-pixels in two neighboring pixel group are greater than the distance between the first sub-pixels in the two neighboring pixel group.