RBGB Pixel Arrangement for OLED Manufacturing Cost Reduction
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Solution Overview
Problem
The manufacturing of high-resolution organic light-emitting diode display devices is hindered by costly fine metal masks and the low luminous efficiency and short service life of blue organic materials, which degrade display quality.
Innovation Solution
A novel pixel arrangement with more blue sub-pixels than red and green sub-pixels, allowing the blue organic material layer to be deposited without an additional fine metal mask, reducing manufacturing costs and enhancing luminous efficiency by increasing the percentage of blue sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional RGB pixel arrangement is used, then manufacturing process is standard, but blue sub-pixel luminous efficiency is insufficient
Solution Approach 1:
The patent applies asymmetry by using an RBGB pixel arrangement instead of conventional RGB, where blue sub-pixels are increased in quantity and strategically positioned. This asymmetric distribution compensates for the inherently lower luminous efficiency of blue organic materials by providing more blue emitting areas, thereby improving overall display brightness and energy efficiency without changing the fundamental manufacturing process.
Solution Approach 2:
The patent changes the parameter of sub-pixel quantity distribution by increasing the number of blue sub-pixels from 1 per pixel to 2 per pixel in the RBGB arrangement. This parameter change directly addresses the low luminous efficiency of blue organic materials by compensating through increased quantity, allowing the display to achieve adequate brightness levels despite the lower efficiency of each individual blue sub-pixel.
2Manufacturing precision
If high PPI resolution is achieved, then display fineness is improved, but manufacturing cost increases due to fine metal mask requirements
Solution Approach 1:
The patent applies universality by designing the RBGB pixel arrangement to be compatible with existing evaporation manufacturing processes. The pattern allows a single metal mask to define multiple sub-pixel types (red, blue, green) across different pixel locations, reducing the need for multiple specialized masks and thereby lowering manufacturing costs while maintaining high PPI resolution capabilities.
Solution Approach 2:
The patent uses copying by repeating the blue sub-pixel pattern across multiple pixel locations in the RBGB arrangement. This copying strategy allows the same blue sub-pixel structure to be replicated throughout the display, enabling high resolution through pattern repetition rather than requiring complex, high-cost custom masks for each pixel type.
3Illumination intensity
If blue organic material is used, then blue light emission is achieved, but service life is short
Solution Approach 1:
The patent applies local quality by strategically positioning blue sub-pixels in specific locations within each pixel group (the B and B' positions in RBGB arrangement). This localized distribution of blue emitting elements allows the display to achieve necessary blue light emission in critical areas while the overall increased quantity of blue sub-pixels compensates for their shorter individual service life through redundancy.
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 supports high-resolution displays while reducing manufacturing costs and improving display quality by compensating for the inferior luminous efficiency of blue sub-pixels, achieving better overall performance.
Implementation Method 1
a blue organic material layer disposed on the third electrodes, the red organic material layer and the green organic material layer
Data Source
AI summary
A display device includes: a pixel group, including first and second sub-pixels, third and fourth sub-pixels, and fifth, sixth and seventh sub-pixels, wherein the first sub-pixel is diagonal to the second sub-pixel, the fifth sub-pixel is between the first and second sub-pixels, the third sub-pixel is diagonal to the fourth sub-pixel, and the fifth sub-pixel is between the third and fourth sub-pixels, wherein the scan line is electrically connected to thin film transistors of the first, fifth, third and sixth sub-pixels, wherein the first data line is electrically connected to thin film transistors of the first and fourth sub-pixels, and the second data line is electrically connected to thin film transistors of the fifth and seventh sub-pixels, wherein the first and second sub-pixel have the same color, the third and fourth sub-pixel have the same color, and the fifth, sixth and seventh sub-pixel have the same color.