Asymmetric Rectangular Pixel Regions for Vapor Deposition Mask Offset
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Solution Overview
Problem
Conventional display devices using vapor deposition methods for forming light-emitting regions of RGB pixels in PenTile or stripe arrangements suffer from color mixing due to positional offsets of vapor deposition masks, leading to reduced display quality.
Innovation Solution
The display device incorporates a thin film transistor layer and a light-emitting element layer with rectangular light-emitting regions, where adjacent pixels of the same color have their rectangular portions rotated 90° relative to each other, and the short sides of these regions face adjacent pixels of different colors, reducing color mixing occurrence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a vapor deposition method is used to form light-emitting regions of RGB pixels in PenTile or stripe arrangements, then the display device can be manufactured with conventional processes, but color mixing occurs due to positional offsets of vapor deposition masks leading to reduced display quality
Solution Approach 1:
The patent introduces asymmetric rectangular light-emitting regions with different orientations for adjacent pixels of the same color. Specifically, alternating pixels have their rectangular regions rotated 90 degrees relative to each other, creating an asymmetric pattern that prevents color mixing by ensuring vapor-deposited material from one pixel does not overlap with adjacent pixels of different colors, even when mask positional offsets occur
Solution Approach 2:
The patent applies different orientations of rectangular light-emitting regions to different pixel locations based on their color and position. By locally varying the orientation of rectangular regions in a systematic pattern, the design optimizes each local area to prevent color mixing while maintaining overall display quality and manufacturability
2Manufacturing precision
If rectangular light-emitting regions are used with alternating 90° rotation for adjacent pixels of the same color, then color mixing occurrence region is reduced, but the device structure becomes more complex
Solution Approach 1:
The patent divides each pixel's light-emitting region into a rectangular shape with specific orientation, and further segments the overall display into alternating patterns of different orientations. This segmentation approach simplifies the prevention of color mixing by creating distinct, non-overlapping rectangular regions that are easier to control during vapor deposition compared to conventional circular or square pixel designs
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 minimizes color mixing and enhances display quality by reducing the area of color mixing occurrence regions, even when using vapor deposition methods, thereby improving the reliability and longevity of the display device.
Implementation Method 1
a light-emitting element layer in which a plurality of light-emitting elements is formed, the plurality of light-emitting elements including a first electrode, a light-emitting layer, and a second electrode and having a luminescent color different from each other
Implementation Method 2
The conventional display device as described above uses, for example, a vapor deposition method to form light-emitting regions of pixels of each color of R, G, and B
Data Source
AI summary
A display device includes a thin film transistor layer and a light-emitting element layer in which a plurality of light-emitting elements is formed. Each of the plurality of pixels is provided with a rectangular portion formed in a rectangular shape in a light-emitting region. A long side direction of the rectangular portion is inclined at an angle predetermined with respect to a first direction predetermined in the display region. In pixels of the same luminescent color of the plurality of pixels, the rectangular portions of two pixels adjacent to each other in the first direction or a second direction orthogonal to the first direction are provided at positions rotated by 90° with respect to each other. In the plurality of pixels, a short side of each of the rectangular portions faces the light-emitting region of an adjacent pixel of a different luminescent color.