Hexagonal Pixel Matrix for OLED Aperture Ratio
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Solution Overview
Problem
Current OLED display apparatuses face challenges in achieving high resolution due to limitations in color patterning, backplane pixel compensation circuit technology, and electroluminescent (EL) material life, particularly in increasing the aperture ratio and reducing current density.
Innovation Solution
The display apparatus features hexagonal pixels arranged in a matrix with specific side length ratios and shifted rows to reduce the number of pixels per dot, increasing the backplane compensation circuit area and aperture ratio, while extending the life of the EL material by reducing current density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of pixels per dot is reduced, then the area of backplane compensation circuit is increased, but the resolution may be degraded
Solution Approach 1:
The pixel array is segmented into multiple sub-pixels (first, second, third, and fourth sub-pixels) within each pixel unit. This segmentation allows the circuit area to be distributed and optimized while maintaining the overall resolution through the combined output of multiple sub-pixels.
Solution Approach 2:
The patent introduces a staggered arrangement where odd-numbered and even-numbered pixels are offset from each other in the vertical direction. This dimensional adjustment optimizes the spatial distribution of pixels and compensation circuits, allowing for increased circuit area without compromising resolution.
2Area of stationary object
If the aperture ratio is increased, then the light emission area is improved, but the current density per area of EL increases
Solution Approach 1:
Each pixel is divided into multiple sub-pixels, which allows the total light emission area (aperture ratio) to be increased while distributing the current load across multiple smaller EL elements. This segmentation reduces the current density per individual EL area.
Solution Approach 2:
The patent applies different characteristics to different parts of the pixel structure. By creating multiple sub-pixels with potentially different configurations, the local current density can be optimized for each sub-pixel while achieving a high overall aperture ratio for the complete pixel.
3Area of stationary object
If hexagonal pixels with specific side ratios are used, then the aperture ratio is increased, but the manufacturing complexity increases
Solution Approach 1:
The patent employs hexagonal pixels with asymmetric side length ratios, where the first and fourth sides have different lengths compared to the second, third, fifth, and sixth sides. This asymmetric design optimizes the aperture ratio while the specific geometric relationships are designed to be compatible with standard fabrication processes.
Solution Approach 2:
By carefully selecting specific parameter relationships (side length ratios and angles) for the hexagonal pixels, the patent achieves high aperture ratios while maintaining manufacturability. The parameters are optimized to balance geometric efficiency with fabrication constraints.
Data Source
AI summary
A display apparatus includes a substrate and pixels defined on the substrate, where each of the pixels is a hexagon having a first side, a second side, a third side, a fourth side, a fifth side and a sixth side, and the sum of the length of the first side and the length of the fourth side is greater than half the sum of the lengths of the second, third, fifth and sixth sides.