LED Backlight Driving Circuit Segmentation for Conversion Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing LED backlight driving circuits face inefficiencies in energy conversion due to high output voltages required for large LED panels, leading to reduced conversion efficiency and energy waste.
Innovation Solution
The proposed solution involves separating the LED string into two branches with separate capacitors and a boosted circuit, allowing for reduced output voltages and improved conversion efficiency by alternating power supply between the branches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of LED lights is increased to meet large panel requirements, then the coverage area is improved, but the output voltage requirement increases leading to reduced conversion efficiency
Solution Approach 1:
The patent divides the LED string into multiple parallel branches (first LED string, second LED string, etc.), each driven by separate capacitors. This segmentation allows the total voltage requirement to be distributed across multiple lower-voltage paths, improving conversion efficiency while maintaining the ability to drive a large number of LED lights for large panel coverage.
2Quantity of substance
If the output voltage is increased to drive more LED lights in series, then the number of LED lights is improved, but the conversion efficiency deteriorates
Solution Approach 1:
The LED string is segmented into multiple parallel branches with separate capacitors for each branch. This allows the system to drive a larger quantity of LED lights by distributing them across multiple lower-voltage paths rather than using a single high-voltage path, thereby maintaining higher conversion efficiency.
Solution Approach 2:
The patent employs alternating charging and discharging cycles of multiple capacitors to drive different LED string branches. During each cycle, one capacitor charges while another discharges, creating periodic action that maintains continuous illumination while allowing voltage recovery and redistribution, improving overall energy efficiency.
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 approach enhances energy efficiency and enables the driving of a large number of LED lights while reducing stress on components, thereby improving the overall performance of the LED backlight driving circuit.
Implementation Method 1
a boosted circuit, an input terminal of which is electrically connected to the power source for power access and an output terminal of which is electrically connected to the first capacitor, the second capacitor, the first LED string, and the second LED string, respectively
Data Source
AI summary
This invention discloses a LED backlight driving circuit including: a first and a second LED strings; a first and a second capacitors; a boosted circuit, an input of which is connected to the power source and an output of which is connected to the first and the second capacitors, and the first and the second LED strings; an LED controller, electrically connected to the boosted circuit, in the first period is used for controlling the boosted circuit to supply power to the first branch and to charge the first capacitor and the same as to the second branch and the second capacitor; in the second period it is used for controlling the boosted circuit to cut off the first branch to make the first capacitor charge to the first branch and the same as to the second branch and the second capacitor. This invention also discloses a liquid crystal display.