Backlight Unit Inverter Circuit for LED Dimming Test
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Solution Overview
Problem
Existing backlight units for liquid crystal display devices require external systems for dimming tests, leading to increased fabrication costs and reduced production yield due to the need for disassembly upon detecting abnormal LED operations.
Innovation Solution
A backlight unit with integrated inverter circuit parts that generate and control dimming signals to perform self-contained dimming tests, allowing for the detection of defects without external apparatuses, using control signals to display specific dimming patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external systems are used for dimming tests, then dimming test functionality is achieved, but fabrication cost increases and production yield decreases
Solution Approach 1:
The patent combines the dimming test signal generation function with the inverter circuit by integrating a dimming test portion into the inverter. This merging eliminates the need for separate external test systems, reducing device complexity while maintaining defect detection capability. The inverter circuit now serves dual purposes: normal LED control and dimming test signal generation.
Solution Approach 2:
The inverter circuit is designed with multi-functionality, serving both as a normal control circuit for LED operation and as a test signal generator for dimming tests. This universal design allows the same hardware to perform multiple functions, eliminating the need for separate external test equipment and reducing overall system complexity.
2Reliability
If external systems are used for dimming tests, then dimming test functionality is achieved, but production yield decreases due to disassembly requirements
Solution Approach 1:
The patent implements preliminary action by enabling dimming tests to be performed during the assembly process itself, before final product completion. The integrated inverter circuit can generate test signals at any stage, allowing defect detection without disassembly. This preliminary testing approach prevents defective products from proceeding to later stages, maintaining high production yield.
3Reliability
If additional test apparatus is used, then dimming test capability is improved, but fabrication cost increases
Solution Approach 1:
The inverter circuit performs self-service by generating its own dimming test signals internally through the integrated dimming test portion. This eliminates the need for external test apparatus and the associated fabrication costs. The circuit uses its existing components to create test signals, making the manufacturing process simpler and more cost-effective.
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 enables cost-effective dimming tests within the backlight unit, improving production yield by eliminating the need for external systems and allowing for real-time defect detection during assembly.
Implementation Method 1
a light emitting diode (LED) having advantages in a power consumption, a weight and a brightness has been suggested as a light source for the backlight unit
Data Source
AI summary
A backlight unit for a liquid crystal display device includes: at least one light source; and an inverter circuit part including a dimming test portion generating a dimming signal and turning ON/OFF the at least one light source using the dimming signal.