Sub-pixel Configuration for Display Transmittance and Luminance
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Solution Overview
Problem
Increasing pixel density in display devices, such as LCD and OLED, leads to decreased transmittance and luminance, and increased manufacturing difficulties due to reduced aperture ratio and limitations in fine metal mask processes.
Innovation Solution
A novel sub-pixel configuration where each sub-pixel array forms a virtual quadrilateral with specific color arrangements, allowing for enlarged distances between sub-pixels, improving transmittance and luminance while simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel density is increased to improve image quality, then PPI increases, but transmittance and luminance decrease
Solution Approach 1:
The invention segments the traditional pixel structure by removing the color filter layer and dividing each pixel into multiple sub-pixels (e.g., four sub-pixels per pixel: red, green, blue, and white). This segmentation allows the white sub-pixel to provide additional luminance without increasing overall pixel density, thereby improving transmittance and luminance while maintaining high PPI.
Solution Approach 2:
The invention introduces a new dimension to the color representation by adding a white sub-pixel in addition to the traditional RGB sub-pixels. This dimensional expansion allows the display to achieve higher luminance through the white sub-pixel while the RGB sub-pixels maintain color accuracy, effectively resolving the trade-off between pixel density and luminance.
2Measurement precision
If pixel density is increased to improve image quality, then PPI increases, but manufacturing difficulty increases
Solution Approach 1:
The invention extracts and removes the color filter layer from the traditional display structure. By taking out this complex layer, the manufacturing process is simplified significantly, as the color filter layer is one of the most difficult and costly layers to manufacture at high resolutions. The color information is instead generated directly by the LED sub-pixels themselves.
Solution Approach 2:
The invention replaces the mechanical/optical color filtering system with an electrical/optical emission system where each LED sub-pixel directly emits its color. This substitution eliminates the need for precise color filter alignment and manufacturing, thereby reducing manufacturing difficulty while maintaining or improving image quality.
3Measurement precision
If aperture ratio is decreased due to higher resolution, then more pixels fit in unit area, but OLED yield rates are reduced
Solution Approach 1:
The invention segments each pixel into multiple smaller LED sub-pixels (typically four: red, green, blue, and white). This segmentation allows for better utilization of the pixel area and improves the aperture ratio because each individual LED sub-pixel can be smaller and more efficiently packed, while collectively providing the full color spectrum and high luminance output.
Solution Approach 2:
The invention uses a composite structure of multiple LED materials (different phosphors or quantum dots for red, green, blue, and white sub-pixels) within each pixel unit. This composite approach allows for optimized light emission from each material type while maintaining overall pixel efficiency and yield rates, as each LED sub-pixel can be independently optimized for its specific wavelength range.
Data Source
AI summary
A display device includes a plurality of sub-pixel arrays and each of sub-pixel arrays includes a plurality of first sub-pixels having a first color and forming a plurality of vertexes of a virtual quadrilateral, wherein there is not any other first sub-pixels having the first color located in the virtual quadrilateral; at least one second sub-pixel, having a second color different from the first color and located in the virtual quadrilateral; and at least one third sub-pixel, having a third color different from the first color and the second color and located in the virtual quadrilateral.