OLED Aperture Ratio via Integrated Pixel Grouping
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Solution Overview
Problem
Existing organic light emitting display apparatuses face challenges in achieving high efficiency light emission and mass production due to difficulties in forming minute patterns on organic thin films, leading to unsatisfactory driving voltage, current density, luminance, color purity, and durability, particularly because of the limitations in aperture ratio and precision required in mask patterning and alignment.
Innovation Solution
The solution involves an organic light emitting display apparatus with a structure where adjacent sub-pixels are grouped to share integrated intermediate layers, reducing the distance between sub-pixels within a group while increasing the distance between groups, and arranging these layers in a zigzag configuration, which allows for a higher aperture ratio and improved manufacturing precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If intermediate layers are formed separately for each pixel using mask patterning, then manufacturing precision can be maintained, but aperture ratio decreases and productivity is reduced
Solution Approach 1:
The patent merges the intermediate layers of multiple adjacent pixels into a single integrated structure. Instead of forming separate intermediate layers for each pixel using mask patterning, the invention integrates these layers across pixel boundaries, thereby reducing the number of masking steps and improving aperture ratio while maintaining manufacturing precision through the integrated approach.
Solution Approach 2:
The patent segments the display structure into pixel groups where intermediate layers are integrated within each group. This segmentation allows for optimized patterning at the group level rather than individual pixel level, improving both aperture ratio and manufacturing efficiency while maintaining sufficient precision for color differentiation.
2Manufacturing precision
If mask patterning is used for forming intermediate layers, then manufacturing precision is maintained, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple mask patterning operations into a single integrated layer formation process. By merging the intermediate layers of multiple pixels into one structure, the invention eliminates the need for separate masking steps for each pixel, thereby reducing device complexity and manufacturing cost while maintaining adequate precision through the integrated approach.
3Measurement precision
If distance between adjacent pixels is reduced for high resolution, then resolution improves, but manufacturing precision becomes more difficult to maintain
Solution Approach 1:
The patent merges intermediate layers across adjacent pixels into integrated structures that span multiple pixel boundaries. This approach allows for reduced pitch between pixels while maintaining manufacturing precision, as the integrated layers are formed in fewer steps with relaxed alignment requirements compared to individual pixel patterning.
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 aperture ratio, leading to increased durability and productivity, enabling the mass production of high-resolution organic light emitting display apparatuses with improved light emission efficiency and reduced manufacturing costs.
Implementation Method 1
The organic light emitting display apparatus may realize colored light via a principle that a hole and an electron from the anode and the cathode combine in the light emitting layer, and the combination emits light.
Data Source
AI summary
An organic light emitting display apparatus including a plurality of pixels, wherein each pixel includes a first electrode, a second electrode facing the first electrode, and an intermediate layer disposed between the first and second electrodes and including a plurality of layers including a light emitting layer, at least two pixels adjacent in a first direction form a pixel group, and at least one of the layers of the intermediate layer of the at least two adjacent pixels of the pixel group is integrated, and a distance between pixels in the pixel group is smaller than a distance between adjacent pixel groups.