RGBW Panel Edge Sharpness via Local Luminance Control
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Solution Overview
Problem
Image display apparatuses with RGBW type panels face challenges in improving the sharpness of edge areas for high-frequency signals, particularly in white/black and black/white grill pattern images, due to subpixel rendering techniques that often result in lowered sharpness.
Innovation Solution
The implementation of a controller and grill processor that adjust the luminance levels of subpixels in RGBW panels by converting RGB video signals to RGBW signals and setting specific luminance levels for WRG and GBW data based on reference levels, ensuring that the luminance of subpixels is maintained or adjusted to enhance edge sharpness, even in grill pattern images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If subpixel rendering techniques are applied to improve color representation on RGBW panels, then color accuracy is improved, but sharpness of edge areas deteriorates
Solution Approach 1:
The patent applies different processing methods to different pixel types based on their local characteristics. Specifically, it processes RGB pixels and WRG pixels differently by selectively applying subpixel rendering only to certain pixels while maintaining others, thereby achieving local optimization that preserves both color accuracy and edge sharpness in different regions of the display.
Solution Approach 2:
The patent applies subpixel rendering partially rather than universally. It selectively applies the technique only to specific pixel types (e.g., WRG pixels) under certain conditions, while excluding others (e.g., RGB pixels), thereby achieving the benefits of subpixel rendering without the harmful effects on edge sharpness that would occur with full application.
2Device complexity
If subpixel rendering is applied to all pixels uniformly, then processing simplicity is maintained, but edge sharpness in grill pattern images deteriorates
Solution Approach 1:
The patent introduces local quality differentiation by treating different pixel types differently. It identifies specific pixel types (WRG pixels) that are more prone to edge blur in grill patterns and applies enhanced processing only to those, while leaving other pixel types (RGB pixels) with standard processing, thus maintaining overall simplicity while addressing specific problems locally.
Solution Approach 2:
The patent segments the pixel population into different categories (RGB pixels and WRG pixels) and applies different rendering strategies to each segment. This segmentation allows the system to maintain processing simplicity for the majority of pixels while applying specialized handling only where edge sharpness is compromised, effectively dividing the problem into manageable parts.
3Manufacturing precision
If luminance levels of subpixels are adjusted to enhance edge sharpness, then edge definition is improved, but color accuracy may deteriorate
Solution Approach 1:
The patent applies local quality adjustments by modifying luminance levels selectively for specific pixel types (WRG pixels) rather than uniformly for all pixels. This localized adjustment enhances edge definition in areas where WRG pixels are present while preserving color accuracy in other areas, as the luminance adjustment is confined to specific regions where it is most needed for edge sharpness.
Solution Approach 2:
The patent changes the luminance parameter selectively for WRG pixels while maintaining other parameters (color information) unchanged. By adjusting only the luminance parameter for specific pixel types and not altering color parameters globally, the system achieves improved edge definition without compromising overall color accuracy, as the parameter change is localized rather than universal.
Data Source
AI summary
The present invention relates to an image display apparatus including a panel having repeatedly arranged RGBW subpixels and pixels including a first pixel, second pixel and third pixel, each having at least three subpixels and the first and third pixels being disposed immediately adjacent to the left and right sides of the second pixel; a controller for applying, to the subpixels of the first or third pixel, data corresponding to a subpixel of a color not included in the second pixel. When the luminance level of the second pixel is lower than a first reference level and luminance difference between the first and second pixels or between the second and third pixels is greater than a second reference level, the controller may not apply the data to subpixels of the first or third pixel. Thus, on the RGBW type panel, sharpness of the edge area can be improved.