Octagonal Transparent Part Reduces Diffraction Haze in OLED Displays
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Solution Overview
Problem
Organic light emitting display devices experience diffraction and haze due to the rectangular shape of their transparent parts, which reduces sharpness and visibility.
Innovation Solution
The display device incorporates a transparent part with a regular octagonal or circular shape, surrounded by sub-pixels, to minimize diffraction and haze, and eliminates the black matrix on the white sub-pixel to enhance sharpness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a rectangular transparent part is used in the display device, then the manufacturing process is simple and the structure is easy to implement, but diffraction occurs at the edges due to different width and height lengths, causing haze and reducing sharpness
Solution Approach 1:
The patent applies asymmetry by changing the transparent part shape from a conventional rectangle to a regular octagon, where all sides are equal in length. This symmetric design eliminates the edge diffraction problem caused by rectangular shapes with different width and height, thereby reducing haze and improving sharpness while maintaining ease of manufacture
Solution Approach 2:
The patent changes the geometric parameters of the transparent part by defining specific relationships between side lengths (a=b=c=d=e=f=g=h) and angles (all internal angles equal to 135 degrees), transforming it from a rectangular shape to a regular octagonal shape. This parameter change eliminates diffraction at edges while preserving manufacturing feasibility
2Device complexity
If a rectangular transparent part is used in the display device, then the design is conventional and simple, but diffraction and haze occur at the edges, reducing visibility
Solution Approach 1:
The patent applies asymmetry by changing the transparent part shape from a conventional rectangle to a regular octagon, where all sides are equal in length. This symmetric design eliminates the edge diffraction problem caused by rectangular shapes with different width and height, thereby reducing haze and improving sharpness while maintaining ease of manufacture
Solution Approach 2:
The patent applies curvature by replacing the sharp corners of the rectangular transparent part with curved edges in the regular octagonal design. This curvature eliminates the abrupt edge transitions that cause diffraction, thereby reducing haze and improving visibility while maintaining relatively simple device structure
3Ease of manufacture
If the black matrix is retained on the white sub-pixel, then the manufacturing process is conventional, but the sharpness and visibility of the display device is reduced
Solution Approach 1:
The patent applies the extraction principle by removing the black matrix from the white sub-pixel area. This eliminates the harmful black matrix that reduces sharpness and visibility, while the transparent part design compensates for any potential manufacturing complexity through its geometric configuration
Solution Approach 2:
The patent applies local quality by selectively removing the black matrix only from the white sub-pixel area while maintaining it in other areas where needed. This localized modification improves sharpness and visibility without compromising the overall manufacturing process or structural integrity
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 design improves the sharpness and visibility of the display device by reducing diffraction and haze at the edges of the transparent part, while maintaining the transparency and functionality of the display panel.
Implementation Method 1
diffraction occurs at edges of the rectangular transparent part due to width and height thereof having different lengths, respectively. Such diffraction causes haze, which reduces the sharpness of the display device
Data Source
AI summary
A display device includes: a pixel part in which sub-pixels are disposed, and at least one transparent part disposed in an area adjacent to the pixel part. The at least one transparent part passes external light therethrough. The pixel part may include: first, second, third and fourth extension parts extending in directions different from each other and including wires; and first, second, third and fourth circuit parts. Each of the first, second, third and fourth circuit parts is disposed between adjacent pairs of the first, second, third and fourth extension parts and includes circuit elements of a respective sub-pixel of the sub-pixels.