Display Backlight Power Management via Overload Detection
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Solution Overview
Problem
Devices using USB interfaces for power supply often experience overloads due to insufficient power capacity, leading to a lack of screen display and poor user experience.
Innovation Solution
A power management method and system that includes an overload detection circuit and a power capacity determination circuit to automatically adjust the backlight brightness of a display device, preventing overloads by detecting power supply limitations and adjusting device loading accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the display device draws high power from the USB power source, then the display performance and brightness are improved, but the power supply becomes overloaded and screen display fails
Solution Approach 1:
The system performs preliminary detection of power supply capacity before full operation. The overload detection circuit and power capacity determination circuit detect the maximum power capacity in advance, allowing the display device to adjust its power consumption accordingly before an overload condition occurs, preventing screen display failure.
Solution Approach 2:
The system implements a feedback mechanism where the overload detection circuit continuously monitors power supply conditions and feeds this information back to the control circuit. The control circuit adjusts the backlight brightness based on this feedback, dynamically balancing display performance with power supply stability.
2Productivity
If the display device operates at maximum power capacity, then the display quality is improved, but the risk of overload and device damage increases
Solution Approach 1:
The system applies preliminary anti-action by detecting power capacity limitations before they cause harmful effects. The overload detection circuit identifies potential overload conditions in advance, and the control circuit preemptively adjusts power consumption to prevent damage to the display device or power supply.
Solution Approach 2:
The system implements beforehand cushioning by creating a safety buffer through power capacity detection. The determined power capacity range establishes a cushion between maximum safe power consumption and dangerous overload levels, allowing the display to operate at high performance while maintaining a safety margin.
3Reliability
If the system implements power detection and adjustment mechanisms, then power management safety is improved, but the device complexity increases
Solution Approach 1:
The patent merges the power detection and control functions into the existing display device architecture. The overload detection circuit and power capacity determination circuit are integrated with the control circuit that already manages backlight brightness, reducing the need for separate complex control systems while maintaining power management safety.
Data Source
AI summary
A power management method a display device utilizes the same are disclosed. The power management method, adopted by the display device, includes: increasing, by a control circuit, brightness of a lighting device, wherein the lighting device is configured to illuminate a display panel device; detecting, by an overload detection circuit, whether an overload has been triggered by the increased brightness; and when the overload has been triggered by the increased brightness, recording, by a power capacity determination circuit, a maximal predetermined brightness that is used prior to the overload is triggered, while showing an on-screen-display (OSD) warning message on a display of the display device for reminding the user. When the brightness of the lighting device reaches the maximal predetermined brightness and the power capacity determination circuit detects no overload, this indicates the power capacity is sufficient for supplying power to the display device.