Hybrid Backlight Driving Apparatus for LCD Power Efficiency
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Solution Overview
Problem
Existing liquid crystal display (LCD) backlight driving systems experience unnecessary power loss and reduced voltage conversion efficiency due to the use of DC/DC converters and boost converters, which also increase the number of components and manufacturing costs.
Innovation Solution
A hybrid backlight driving apparatus that includes a lamp inverter for converting a first DC voltage into a lamp driving voltage and a light emitting diode driver for converting the same DC voltage into a light emitting diode driving voltage, eliminating the need for a boost converter and reducing power loss, while using a lamp inverter to generate AC voltage for lamps and a light emitting diode driver to generate a DC voltage for LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If DC/DC converters and boost converters are used in the backlight driving system, then voltage conversion can be achieved, but power loss increases and conversion efficiency decreases
Solution Approach 1:
The patent merges the lamp inverter and LED driver into a single integrated circuit that performs both voltage conversion functions. The inverter circuit simultaneously generates AC voltage for lamps and DC voltage for LEDs from the same high voltage input, eliminating the need for separate DC/DC converters and boost converters, thereby reducing power loss and improving conversion efficiency
Solution Approach 2:
The inverter circuit is designed as a universal power conversion device that can simultaneously serve multiple functions: converting high voltage to AC voltage for lamp operation and converting high voltage to DC voltage for LED operation. This multi-functional approach replaces multiple dedicated conversion circuits, reducing overall system complexity and energy loss
2Loss of energy
If DC/DC converters and boost converters are used in the backlight driving system, then voltage conversion can be achieved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple voltage conversion functions into a single inverter circuit, reducing the total number of components that need to be manufactured and assembled. By integrating the lamp inverter and LED driver functions into one circuit, the manufacturing process is simplified and component costs are reduced, while maintaining high conversion efficiency
3Loss of energy
If a boost converter is used to supply driving voltage to LEDs, then voltage conversion is achieved, but driving efficiency deteriorates and manufacturing cost increases
Solution Approach 1:
The patent eliminates the separate boost converter for LED driving by integrating the voltage conversion function into the main inverter circuit. The inverter circuit directly generates both AC voltage for lamps and DC voltage for LEDs from the high voltage input, removing the need for additional boost converter components and improving overall driving 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 solution prevents unnecessary power loss, improves voltage conversion efficiency, reduces the number of components, and enhances driving efficiency by directly converting high voltage into driving voltage for both lamps and LEDs without using a boost converter.
Implementation Method 1
a lamp inverter for converting a first DC voltage into a lamp driving voltage and supplying the lamp driving voltage to the plurality of lamps
Implementation Method 2
a light emitting diode driver for converting the first DC voltage into a light emitting diode driving voltage and supplying the light emitting diode driving voltage to the plurality of light emitting diodes
Data Source
AI summary
A hybrid backlight driving apparatus for a liquid crystal display device for driving a backlight assembly is provided. The hybrid backlight assembly has a plurality of lamps and a plurality of light emitting diodes. The hybrid backlight driving apparatus, as embodied, includes: a lamp inverter for converting a first DC voltage into a lamp driving voltage and supplying the lamp driving voltage to the plurality of lamps; and a light emitting diode driver for converting the first DC voltage into a light emitting diode driving voltage and supplying the light emitting diode driving voltage to the plurality of light emitting diodes.