OLED Panel Contact Hole Matrix for Aperture Ratio
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Solution Overview
Problem
The existing organic light emitting display panel technology faces limitations in manufacturing high-resolution displays due to the constraints of fine metal masks, which restrict the aperture ratio and emission area of sub-pixels, making it difficult to achieve high resolution beyond a certain threshold.
Innovation Solution
The proposed solution involves an organic light emitting display panel with a matrix-type arrangement of unit pixels, each containing three organic light emitting diodes of different colors, where the contact holes and insulating layer holes are strategically positioned to allow for parallel arrangement of connection electrodes, enhancing the aperture ratio and enabling the deposition of multiple organic emission layers simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If contact holes are formed at the same positions of lower ends of all sub-pixels in a stripe structure, then electrical connection between driving TFT and OLED is achieved, but aperture ratio and emission area are reduced
Solution Approach 1:
The patent transitions from a stripe structure to a matrix structure where contact holes are arranged in multiple rows and columns corresponding to different colored sub-pixels (red, green, blue). This dimensional reorganization allows contact holes to be positioned within the emission area rather than at the boundaries, thereby increasing the aperture ratio while maintaining proper electrical connections between driving TFTs and OLEDs.
Solution Approach 2:
The patent employs asymmetric arrangement of contact holes for different colored sub-pixels within each pixel unit. Instead of uniform positioning, red, green, and blue sub-pixels have contact holes at different locations optimized for their respective emission areas, allowing maximization of the organic emission layer width while ensuring proper electrical connectivity.
2Manufacturing precision
If fine metal mask pattern is reduced for high-resolution manufacturing, then resolution increases, but manufacturing capability is exceeded
Solution Approach 1:
The patent segments the pixel structure into a matrix arrangement with distinct contact hole positions for each color sub-pixel. This segmentation allows the organic emission layer to be deposited in a wider area using less精细 (less fine) metal mask patterns, as the contact holes are strategically positioned to accommodate broader emission regions while still achieving high resolution through the organized matrix structure.
Solution Approach 2:
By reorganizing the contact hole arrangement from a single-row stripe structure to a multi-row multi-column matrix structure, the patent enables wider organic emission layers to be formed. This dimensional change in the contact hole layout allows the use of coarser metal mask patterns while maintaining high resolution, thereby overcoming the manufacturing limitations of extremely fine patterns.
3Manufacturing precision
If sub-pixel size is reduced for higher resolution, then resolution increases, but aperture ratio cannot be realized due to fine metal mask limitations
Solution Approach 1:
The patent uses asymmetric positioning of contact holes for different colored sub-pixels (red, green, blue) within each pixel unit. This asymmetric arrangement allows each sub-pixel to have optimized contact hole positions that maximize its emission area, enabling high resolution with larger aperture ratios by avoiding uniform constraints that would limit emission area in smaller sub-pixels.
Solution Approach 2:
The matrix structure with contact holes arranged in multiple dimensions allows wider organic emission layers to be deposited even when sub-pixel sizes are reduced for high resolution. This multi-dimensional contact hole arrangement provides flexibility in positioning connections while maximizing the emission area within each reduced sub-pixel, overcoming the aperture ratio limitations imposed by fine metal mask constraints.
Data Source
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AI summary
Disclosed is an organic light emitting display panel and an organic light emitting display device including the same. In the organic light emitting display panel, a plurality of insulating layer holes (H1) which connect connection electrodes to driving thin film transistors (TFTs) formed in unit pixels (120) configuring one horizontal line are formed in parallel with the horizontal line, and a plurality of planarizing layer holes (H2) which connect the connection electrodes to organic light emitting diodes are formed in parallel with the insulating layer holes.