OLED End Pixel Luminance Control for Delta-Nabla Jagg Reduction
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Solution Overview
Problem
Display devices with delta-nabla arrangements experience conspicuous jaggs at curved corners, impairing image quality due to the visibility of end pixels with outward-oriented green subpixels.
Innovation Solution
The OLED display device reduces the luminance of end pixels with outward-oriented green subpixels by using driving transistors with narrower channel widths than those in internal pixels, and adjusts luminance values based on the orientation and curvature of the corner pixels to minimize visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If delta-nabla arrangement is used for subpixel layout, then color display capability is improved, but jaggs become conspicuous at curved corners
Solution Approach 1:
The patent applies local quality by differentiating the treatment of end pixels from internal pixels. Specifically, end pixels with outward-oriented green subpixels are identified and given different luminance characteristics through adjusted driving transistor channel widths, while internal pixels maintain standard characteristics. This localized differentiation reduces jagg visibility at curved corners without compromising the overall color display capability of the delta-nabla arrangement.
Solution Approach 2:
The patent changes the channel width parameter of driving transistors for specific end pixels to adjust their luminance output. By making the channel widths narrower for end pixels with outward-oriented green subpixels compared to internal pixels, the luminance of these problematic pixels is reduced, thereby minimizing the conspicuousness of jaggs at curved corners while maintaining the color display performance.
2Adaptability or versatility
If end pixels with outward-oriented green subpixels are used at curved corners, then pixel arrangement flexibility is improved, but image quality deteriorates due to conspicuous jaggs
Solution Approach 1:
The patent maintains the flexible delta-nabla pixel arrangement at curved corners but applies local quality control by identifying end pixels with outward-oriented green subpixels and adjusting their driving transistor channel widths. This allows the pixel arrangement to remain flexible and adaptable to curved corner geometries while locally correcting the luminance of problematic pixels to prevent jagg formation, thus preserving image quality.
Solution Approach 2:
The patent changes the channel width parameter of driving transistors for end pixels at curved corners to control their luminance output. By making these channel widths narrower than those of internal pixels, the luminance of end pixels is reduced, which minimizes the visibility of jaggs while maintaining the adaptability of the pixel arrangement to curved corner designs.
3Object-affected harmful factors
If driving transistors with narrower channel widths are used for end pixels, then jagg visibility is reduced, but transistor design complexity increases
Solution Approach 1:
The patent applies local quality by restricting the narrower channel width modification only to specific end pixels with outward-oriented green subpixels, while internal pixels and other end pixels maintain standard channel widths. This localized approach reduces jagg visibility without requiring a complete redesign of all transistors in the display, thereby limiting the increase in design complexity to only the necessary subset of pixels.
Solution Approach 2:
The patent changes the channel width parameter for a specific subset of driving transistors (those controlling end pixels with outward-oriented green subpixels) to reduce their luminance output and minimize jagg visibility. This selective parameter change affects only the necessary transistors rather than requiring a system-wide redesign, thus managing device complexity while achieving the desired visual improvement.
Data Source
AI summary
The first type of pixel lines include first type of end pixels disposed at the end on the opposite side of the first direction and at the end on the opposite side of the second direction of a pixel line in the second direction. The second type of pixel lines include second type of end pixels disposed at the end on the opposite side of the first direction and at the end on the opposite side of the second direction of a pixel line in the second direction. Channel widths of driving transistors for light-emitting elements of the first type of end pixels are narrower than channel widths of driving transistors for light-emitting elements of internal pixels surrounded by other pixels in four directions of the first direction, the opposite direction of the first direction, the second direction, and the opposite direction of the second direction.