OLED Subpixel Layout for Continuous Image Transmittance
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Solution Overview
Problem
Organic light emitting display devices face a challenge in achieving high transmittance and continuous image display due to the disconnected appearance of sub-pixels emitting the same color, which reduces resolution.
Innovation Solution
The design includes a configuration of sub-pixels with emission and transmission regions arranged in specific patterns, where emission regions of adjacent sub-pixels appear connected, and transmission regions are strategically placed to minimize their visibility, enhancing transmittance and reducing the disconnected appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transmission regions are placed between sub-pixels to enable light transmission, then transmittance is improved, but the disconnected appearance between sub-pixels increases
Solution Approach 1:
The patent merges adjacent emission regions of the same color across different sub-pixel rows to create continuous color regions. For example, red emission regions from first and third sub-pixel rows are merged vertically, and green emission regions from second and fourth sub-pixel rows are merged vertically, eliminating the disconnected appearance caused by transmission regions while maintaining high transmittance.
Solution Approach 2:
The patent arranges emission regions in a multi-row pattern (first, second, third, fourth sub-pixel rows) where adjacent emission regions of the same color are positioned in alternating rows. This dimensional arrangement allows transmission regions to be placed between non-adjacent rows while maintaining visual continuity of color regions.
2Manufacturing precision
If emission regions are made larger to improve display quality, then image continuity is improved, but transmittance deteriorates
Solution Approach 1:
The patent applies different patterns to different sub-pixel rows: odd-numbered rows (first and third) have emission regions arranged one above another, while even-numbered rows (second and fourth) have emission regions arranged one above another. This local differentiation allows transmission regions to be strategically placed in specific areas while maintaining emission regions in other areas, achieving both continuity and transmittance.
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 configuration improves the transmittance and appearance of the display, making it more continuous and reducing the disconnected look between sub-pixels, thereby enhancing the overall display quality.
Implementation Method 1
a first emission layer on the plurality of 1-1 electrodes, the first emission layer configured to emit light of a first color; a second emission layer on the plurality of 2-1 electrodes, the second emission layer configured to emit light of a second color that is different from the first color
Implementation Method 2
a plurality of first transmission units, each at a portion of a corresponding one of the plurality of 1-1 electrodes and configured to transmit external light (e.g., without emitting light), and a plurality of second transmission units, each at a portion of a corresponding one of the plurality of 2-1 electrodes and configured to transmit external light
Data Source
AI summary
An organic light emitting display device includes a plurality of first sub-pixels arranged adjacent to each other along a first direction, each of the first sub-pixels includes a first emission region configured to emit light of a first color and a first transmission region configured to transmit external light, the first emission regions of at least two of the first sub-pixels are adjacent to each other; and a plurality of second sub-pixels arranged adjacent to each other along the first direction and adjacent to corresponding ones of the plurality of first sub-pixels along a second direction crossing the first direction, each of the plurality of second sub-pixels includes a second emission region configured to emit light of a second color and a second transmission region configured to transmit external light, the second emission regions of at least two of the sub-pixels are adjacent to each other.