Backlight Unit LED Group Segmentation and Voltage Detection
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Solution Overview
Problem
Conventional backlight units with light emitting diode (LED) strings fail if any LED malfunctions, leading to ineffective operation, as the entire string becomes inoperable, making it difficult to detect and address defects efficiently.
Innovation Solution
A backlight unit design that includes light source groups, a converter, a compensator, a detector, and a protector, which detect abnormal conditions by comparing feedback voltages to a reference voltage, allowing for self-detection and control of LED operation to prevent further damage and facilitate defect identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light emitting diodes are connected in electrical series to form a light emitting diode string, then the light source can be generated effectively, but if any one LED fails or malfunctions, the entire string becomes inoperable
Solution Approach 1:
The patent divides the light emitting diode string into multiple independently controllable light emitting diode groups. Each group has its own switching device and control circuit, allowing individual operation. This segmentation ensures that if one LED fails, only its specific group is affected, not the entire string, thereby improving reliability while maintaining effective light generation.
2Difficulty of detecting and measuring
If conventional LED strings are used without detection mechanisms, then the device complexity is low, but defect detection and inspection are difficult and costly
Solution Approach 1:
The patent incorporates detection circuits that continuously monitor the electrical characteristics of each light emitting diode group. When an LED fails or malfunctions, the detection circuit identifies the defective group and provides feedback to the control circuit. This enables automatic defect detection and inspection, significantly reducing the difficulty of detecting LED defects while the modular design keeps the added complexity manageable.
3Productivity
If the entire light emitting diode string is replaced when one LED fails, then the inspection and repair process is simple, but the loss of time and productivity is high
Solution Approach 1:
The patent implements dynamic control where the switching devices can independently turn on or off each light emitting diode group based on real-time operational status. When an LED fails, the system dynamically adjusts the switching states to isolate the defective group while keeping other groups operational. This enables continuous operation of the backlight unit, maximizing productivity and minimizing time loss without requiring complete string replacement.
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
Enables efficient detection and correction of LED defects, reducing inspection costs and ensuring continuous operation by interrupting the operation of faulty light source groups, thus improving the reliability of the backlight unit.
Implementation Method 1
The detector is connected between the compensator and the light source groups to detect a maximum voltage from among feedback voltages fed back to the compensator from the light source groups
Implementation Method 2
The converter boosts an input voltage to a driving voltage and supplies the driving voltage to the light source groups
Implementation Method 3
The compensator is connected to the light source groups and compensates a deviation between currents fed back to the compensator from the light source groups
Data Source
AI summary
A backlight unit includes light source groups, a converter, a compensator, a detector and a protector. Each of the light source groups includes a light source, and the converter boosts an input voltage to a driving voltage that is supplied to the light source groups. The compensator is connected to the light source groups and compensates a deviation between currents fed back to the compensator from each of the light source groups. The detector is connected between the compensator and the light source groups and detects a maximum voltage from among feedback voltages fed back to the compensator from each of the light source groups. The protector is connected to the detector and receives the maximum voltage, and compares the maximum voltage to a reference voltage to generate a compared result. The protector outputs a protection signal to the converter based on the compared result.