LED Display Power Saving via Pointer-Defined Region Dimming
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Solution Overview
Problem
LCDs with LED backlight panels waste power consumption at the edges due to a fixed 4:3 display ratio, especially in widescreen formats on portable devices, necessitating an improvement in power saving methods.
Innovation Solution
A display power saving method that detects the presence of a pointing device, determines its location, and adjusts the screen brightness by section, decreasing the brightness of areas outside the active display area when in power saving mode, using a light emitting diode panel and processing unit to generate control signals for the LED panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the LCD employs the direct RGB LED backlight panel or the direct white LED backlight panel with a fixed 4:3 display ratio, then the display can support high resolution images, but backlight power consumption at the edges of the LCD is wasted
Solution Approach 1:
The patent applies local quality by dividing the display screen into multiple regions (first display region, second display region, third display region) with different brightness levels. The edge regions have reduced brightness compared to the center region, allowing the display to maintain high resolution while reducing power consumption in areas where full brightness is not needed for content display.
2Area of stationary object
If the LCD uses a large dimension and widescreen format, then the display can accommodate more content, but the backlight power consumption at the edges increases due to the fixed 4:3 display ratio
Solution Approach 1:
The patent implements local quality by creating non-uniform brightness distribution across the display area. The center region maintains full brightness for active content, while edge regions have reduced brightness. This allows the widescreen display to utilize its full area for content while minimizing power consumption in the extended edge regions that would otherwise be wasted with a fixed 4:3 ratio.
Solution Approach 2:
The patent applies dynamics by making the backlight brightness adjustable and adaptive rather than fixed. The display can dynamically adjust brightness levels in different regions based on content requirements, allowing the system to optimize between display area utilization and power consumption for widescreen formats.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method reduces power consumption by selectively dimming non-active screen areas, enhancing power efficiency and readability while maintaining image clarity, particularly in widescreen LCDs on portable devices.
Implementation Method 1
a display device with a light emitting diode panel
Implementation Method 2
decreasing the brightness of an area of the screen other than the display area
Data Source
AI summary
A display power saving method for an electronic system includes a display including a light emitting diode panel. The display power saving method comprises detecting whether a pointing device exists in the electronic system, obtaining the location of a pointer controlled by the pointing device when detecting the pointing device existing in the electronic system, determining a display area of a screen of the display according to the location of the pointer, recognizing whether a power management mode of the electronic system is a power saving mode and decreasing the brightness of an area of the screen other than the display area when recognizing that the power management mode is the power saving mode.