Sub-pixel Rendering Control for Display Image Quality
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Solution Overview
Problem
Display devices for mobile apparatuses face challenges in maintaining image quality during sub-pixel rendering, particularly due to the deterioration of images caused by the arrangement direction of sub-pixels, which affects the display characteristics such as resolution and luminance.
Innovation Solution
A display device with an image display panel arranged in a 2×2 matrix form, including a signal processing unit that decides on sub-pixel rendering processes based on the display mode, adjusts input signal values, and performs rendering processes like RGB or BGR rendering to optimize sub-pixel arrangements and prevent image deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sub-pixel rendering is performed to increase resolution, then pseudo-resolution is improved, but image deterioration occurs due to sub-pixel arrangement direction
Solution Approach 1:
The patent dynamically switches between first and second sub-pixel rendering processes based on the display mode (portrait or landscape). The rendering process is adapted in real-time according to the orientation, selecting the appropriate arrangement pattern to prevent image deterioration while maintaining high resolution.
Solution Approach 2:
The patent applies different sub-pixel rendering processes specifically to the second pixel in the arrangement direction, while other pixels use standard rendering. This localized approach targets the specific problem area caused by sub-pixel arrangement without affecting the entire display, thereby maintaining image quality while achieving pseudo-resolution enhancement.
2Reliability
If display driving is performed in units of pixels to maintain image quality, then reliability is improved, but pseudo-resolution cannot be increased
Solution Approach 1:
The patent segments the pixel rendering into two parts: most pixels are driven in units of pixels to maintain image quality, while the second pixel in the arrangement direction is driven independently by adjusting its sub-pixel input signals. This segmentation allows simultaneous achievement of reliable image quality and pseudo-resolution enhancement.
Solution Approach 2:
The patent changes the input signal parameters of specific sub-pixels in the second pixel based on the display mode. By adjusting these parameters dynamically, the system achieves pseudo-resolution enhancement without compromising the overall image quality maintained by standard pixel-level driving.
3Illumination intensity
If a white sub-pixel is added to enhance luminance, then luminance is improved, but power consumption of the backlight increases
Solution Approach 1:
The patent utilizes the white sub-pixel to enhance luminance by adjusting its input signal parameters dynamically based on display mode and content requirements. This allows the system to achieve high luminance output only when necessary, rather than continuously operating the backlight at high intensity, thereby reducing overall power consumption.
Data Source
AI summary
A display device 10 includes are arranged in a matrix form and to which image information is input, and a signal processing unit 20. The signal processing unit 20 includes a rendering position deciding unit that decides whether or not a sub-pixel rendering process of changing input signal values of sub-pixels of a second pixel among a first pixel, the second pixel, and the third pixel is performed, a pattern information acquiring unit that acquires an arrangement of the sub-pixels in a processing direction of either of a portrait mode and a landscape mode as pattern information indicating a first arrangement pattern or a second arrangement pattern, and a rendering unit that performs a first sub-pixel rendering process or a second sub-pixel rendering process on the input signals of the sub-pixels of the second pixel based on the decision of the rendering position deciding unit and the pattern information.