RGBW Display Panel Aperture Ratio Consistency via Gate Line Bends
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Solution Overview
Problem
RGBW display panels exhibit darker shades when displaying solid or mixed colors due to aperture ratio inconsistencies among red, green, and blue sub-pixels, leading to color shift and reduced display quality.
Innovation Solution
The RGBW display panel design includes bend portions on the gate lines at the borders of sub-pixels adjacent to the white sub-pixel, with TFTs disposed inside the white sub-pixels, to increase the aperture ratios of sub-pixels above and below the white sub-pixel, while reducing aperture ratios of sub-pixels next to the white sub-pixel, thereby achieving consistent aperture ratios and improved display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If TFTs of red, green and blue sub-pixels are disposed in the white sub-pixel to increase aperture ratios of red, green and blue sub-pixels, then the display luminance of solid or two-color mixture image is improved, but the aperture ratio of sub-pixels above and below the white sub-pixel suffers loss leading to white color coordinate drift and color shift
Solution Approach 1:
The patent applies local quality by making the gate line width variable in different regions. Specifically, the gate line width is reduced in areas corresponding to sub-pixels adjacent to white sub-pixels (where aperture ratio loss occurs) and maintained at normal width in other areas. This localized adjustment compensates for the aperture ratio loss in specific regions while preserving the benefits of the RGBW structure in other areas, thereby maintaining overall aperture ratio consistency and color accuracy.
Solution Approach 2:
The patent changes the parameter of gate line width dynamically across different spatial regions. By adjusting the gate line width parameter locally (narrowing it near white sub-pixels), the patent compensates for the aperture ratio loss caused by placing TFTs in white sub-pixels. This parameter change enables the system to maintain consistent optical characteristics across all sub-pixels while preserving the luminance benefits of the RGBW configuration.
2Area of moving object
If TFTs are disposed inside white sub-pixels, then aperture ratios of red, green and blue sub-pixels are increased, but aperture ratio difference among red, green and blue sub-pixels increases causing color shift
Solution Approach 1:
The patent applies local quality by making the gate line width variable in different regions. Specifically, the gate line width is reduced in areas corresponding to sub-pixels adjacent to white sub-pixels (where aperture ratio loss occurs) and maintained at normal width in other areas. This localized adjustment compensates for the aperture ratio loss in specific regions while preserving the benefits of the RGBW structure in other areas, thereby maintaining overall aperture ratio consistency and color accuracy.
Solution Approach 2:
The patent introduces asymmetry in the gate line design by deliberately making the gate line width different in different spatial regions. The gate line is narrower in areas adjacent to white sub-pixels and has normal width elsewhere. This asymmetric design compensates for the non-uniform aperture ratio distribution caused by placing TFTs in white sub-pixels, thereby restoring symmetry in the optical characteristics and preventing color shift.
3Device complexity
If straight gate lines are used with TFTs in white sub-pixels, then device structure is simple, but aperture ratio loss in sub-pixels above and below white sub-pixel causes darker shade in solid color or two-color mixture display
Solution Approach 1:
The patent applies local quality by making the gate line width variable in different regions. Specifically, the gate line width is reduced in areas corresponding to sub-pixels adjacent to white sub-pixels (where aperture ratio loss occurs) and maintained at normal width in other areas. This localized adjustment compensates for the aperture ratio loss in specific regions while preserving the benefits of the RGBW structure in other areas, thereby maintaining overall aperture ratio consistency and color accuracy.
Solution Approach 2:
The patent changes the parameter of gate line width dynamically across different spatial regions. By adjusting the gate line width parameter locally (narrowing it near white sub-pixels), the patent compensates for the aperture ratio loss caused by placing TFTs in white sub-pixels. This parameter change enables the system to maintain consistent optical characteristics across all sub-pixels while preserving the luminance benefits of the RGBW configuration.
Data Source
AI summary
The invention provides an RGBW display panel, or vertically adjacent or horizontally adjacent red sub-pixels, green sub-pixels, blue sub-pixels, and white sub-pixels (W), the TFTs for the red sub-pixels, green sub-pixels, and blue sub-pixels being disposed inside the white sub-pixels (W), and disposing bend portion (11) on borders of the sub-pixels left and right to the white sub-pixel (W) to reduce the aperture ratios of the sub-pixels left and right to the white sub-pixel (W), and increase the aperture ratios of the sub-pixels located above and below the white sub-pixel. As such, the aperture ratios of the red, green, and blue sub-pixels around the white sub-pixel approximate consistency to improve the darker shade problems of RGBW display panel display a solid or two-color mixture screen, as well as avoid white color coordinate drift, improve color shift and improve display quality.