Dual Power Source Control Circuit for Display Backlight
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The battery life of display apparatuses, such as mobile phones, is significantly degraded due to the high power consumption of Liquid Crystal Display (LCD) modules, particularly the backlight, which accounts for 40% to 80% of the overall power consumption.
Innovation Solution
A control circuit with two power sources and a control device that switches power supply to the light source between a first power source dedicated to the light source and a second power source shared with other functional structures, allowing the light source to be powered separately and reducing overall power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common power source is used for both the light source and other functional structures, then the device complexity is reduced, but the power consumption increases significantly
Solution Approach 1:
The power supply system is segmented into two independent power sources: a first power source dedicated to the light source and a second power source for other functional structures. This segmentation allows independent power management, enabling the light source to operate on its own power source while other functions use the second power source, thereby reducing overall power consumption without increasing device complexity
Solution Approach 2:
The control device is designed with multi-functionality to manage both power sources and switch between them. It can control the first switch element for the first power source and the second switch element for the second power source, providing universal power management capability that reduces the need for separate control mechanisms
2Device complexity
If a common power source is used for the light source and other functional structures, then the device structure is simpler, but the battery life is significantly reduced
Solution Approach 1:
By segmenting the power supply into dedicated first and second power sources, the system can independently manage power consumption for the light source versus other functions. This allows the battery to last longer by preventing the high power consumption of the light source from depleting the battery rapidly, while maintaining a simple overall device structure through integrated control
Solution Approach 2:
The system changes the power supply parameter by switching between different power sources based on operational needs. The control device can switch the light source between the first power source and the second power source, optimizing battery life by using the appropriate power source for different operational states
Data Source
AI summary
The present disclosure provides a control circuit, a display apparatus, and a method for supplying power to a light source in a display apparatus. The control circuit includes a first power source, a second power source, and a control device. The first power source and the second power source are both coupled to the control device. The control device is configured to control a connection between the first power source and a light source and a connection between the second power source and the light source.