Display Device Backlight Control for Low-Saturation Pixel Quality
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Solution Overview
Problem
Display devices for mobile apparatuses face challenges in maintaining display quality while reducing power consumption, particularly in low-saturation images where reducing backlight luminance can lead to noticeable deterioration in image quality.
Innovation Solution
A display device with a signal processing unit that calculates a tentative expansion coefficient and index value for each pixel, detects low-saturation pixels, and adjusts the light irradiation amount based on these values to maintain display quality and reduce power consumption by optimizing light output from a light source unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the luminance of the backlight is reduced to lower power consumption, then power consumption is reduced, but the brightness and display quality deteriorate in low-saturation images
Solution Approach 1:
The patent applies local quality by differentiating the treatment of pixels based on their saturation characteristics. Low-saturation pixels receive different backlight luminance control compared to high-saturation pixels, allowing selective optimization. The signal processing unit identifies low-saturation pixels and maintains their luminance at higher levels while allowing greater reduction in other pixels, thus preserving display quality where needed while reducing overall power consumption.
Solution Approach 2:
The patent implements dynamic control of backlight luminance based on real-time analysis of image characteristics. The system continuously evaluates the saturation levels of pixels and dynamically adjusts the backlight luminance accordingly. This dynamic adaptation allows the display to maintain optimal quality for low-saturation regions while achieving power savings in other regions, resolving the contradiction between power consumption and display quality.
2Use of energy by moving object
If the luminance of the backlight is reduced based on image analysis, then power consumption is reduced, but the brightness reduction in low-saturation images is more likely to be recognized, resulting in deterioration in display quality
Solution Approach 1:
The patent applies local quality by differentiating the treatment of pixels based on their saturation characteristics. Low-saturation pixels receive different backlight luminance control compared to high-saturation pixels, allowing selective optimization. The signal processing unit identifies low-saturation pixels and maintains their luminance at higher levels while allowing greater reduction in other pixels, thus preserving display quality where needed while reducing overall power consumption.
Solution Approach 2:
The patent implements feedback control by analyzing the input image signals and using the saturation information to adjust backlight luminance. The system continuously monitors image characteristics and provides feedback control to maintain display quality. By detecting low-saturation pixels and adjusting their luminance accordingly, the system ensures that display quality is maintained in regions where brightness reduction would be most noticeable, thereby improving overall reliability of display quality while reducing power consumption.
Data Source
AI summary
A display device includes an image display panel, a light source unit, and a signal processing unit. The tentative expansion coefficient calculating unit calculates a tentative expansion coefficient. The tentative index value calculating unit calculates a tentative index value serving as an index of the irradiation amount of light based on the tentative expansion coefficient. The low-saturation pixel detecting unit detects low-saturation pixels in a certain region on an image display surface. The light irradiation amount calculating unit calculates a comparative light irradiation amount based on a detection by the low-saturation pixel detecting unit, a display quality maintenance reference value at which the display quality of colors displayed by the low-saturation pixels is maintained, and an index value calculated based on the tentative index value and calculates, based on the comparative light irradiation amount, a light irradiation amount serving as the irradiation amount of light.