Asymmetric Subpixel Arrangement Reduces Lattice Artifacts
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Solution Overview
Problem
In organic light emitting display devices, the reduction in pixel size for high-resolution displays leads to an increased non-emission area ratio, causing a visible black lattice shape due to insufficient process margin, which affects image quality and fill factor.
Innovation Solution
The organic light emitting display device separates sub-pixels into two while maintaining the area of each sub-pixel within a pixel, employing an irregular and asymmetric arrangement of sub-pixels to minimize the non-emission area and improve the cognitive fill factor, thereby reducing the visibility of the black lattice shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel size is reduced for high-resolution displays, then resolution is improved, but non-emission area ratio increases causing visible black lattice shape
Solution Approach 1:
The invention divides each sub-pixel into multiple emission areas separated by non-emission areas. For example, a red sub-pixel is segmented into multiple red emission areas, and a green sub-pixel into multiple green emission areas. This segmentation allows the non-emission areas to be strategically positioned and sized to prevent the formation of visible black lattice patterns while maintaining high resolution.
Solution Approach 2:
The invention employs asymmetric arrangement of emission and non-emission areas within sub-pixels. The non-emission areas are not uniformly distributed but are strategically positioned to break the symmetry that would otherwise create visible black lattice patterns. This asymmetric design helps to minimize the harmful visual effect while preserving the benefits of high-resolution display.
2Reliability
If process margin is maintained between organic light emitting layers, then manufacturing reliability is improved, but non-emission area increases reducing fill factor
Solution Approach 1:
By segmenting sub-pixels into multiple smaller emission areas, the invention reduces the total non-emission area required for process margins. The segmented structure allows for more efficient use of the available pixel area, maintaining adequate spacing between emission areas for manufacturing reliability while maximizing the overall emission area within each sub-pixel.
Solution Approach 2:
The invention optimizes the spatial arrangement of emission and non-emission areas in two dimensions, creating a pattern that minimizes the impact of process margins. By carefully designing the geometry and positioning of multiple emission areas within each sub-pixel, the invention achieves better area utilization while maintaining the necessary process margin for reliable manufacturing.
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 perceived fill factor and image quality by making the emission area appear larger, thus improving the user's recognition of high-resolution images while maintaining or increasing the aperture ratio.
Implementation Method 1
a first organic light emitting layer disposed on the first anode and emitting red, green, or blue light in response to a first applied voltage
Data Source
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AI summary
An organic light emitting display device including a plurality of pixels is provided according to an embodiment. Each of the plurality of pixels includes three sub pixels. The plurality of pixels include a first pixel having a green sub pixel and two red sub pixels, a second pixel having a green sub pixel and two blue sub pixels, the second pixel being adjacent to the first pixel in a first direction, a third pixel having a green sub pixel and two blue sub pixels, the third pixel being adjacent to the first pixel in a second direction, and a fourth pixel having a green sub pixel and two red sub pixels, the fourth pixel being adjacent to the second pixel in the second direction. In the organic light emitting display device according to an example embodiment of the present disclosure, sub pixels are asymmetrically disposed in pixels which are disposed in at least one direction, to reduce lattice artifact by the regular arrangement of the sub pixels.