LED Backlight Driver Circuit with Current Detection for Heat Management
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Solution Overview
Problem
Large-sized video display devices with increased LED modules lead to higher manufacturing costs and significant heat generation due to increased power requirements for driving these modules, necessitating a solution to reduce heat and costs.
Innovation Solution
A display device structure that includes an LED array with a current detector and a driving circuit providing constant current, utilizing a cable with distinct lines for current detection and power supply, and incorporating a stabilizer to manage abnormal operations, thereby reducing heat generation and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of LED modules is increased to achieve large-sized video display devices, then the display size and picture quality are improved, but the heat generation and manufacturing cost are increased
Solution Approach 1:
The patent divides the LED backlight system into multiple independently controllable modules, each with its own driver. This segmentation allows for localized current control and heat management, reducing the overall heat generation problem while maintaining large display size
Solution Approach 2:
The patent implements dynamic local dimming control where different LED modules can be driven with different current levels based on image content requirements. This dynamic adjustment optimizes power consumption and heat generation across different regions of the display
2Area of stationary object
If the number of LED modules is increased to achieve large-sized video display devices, then the display size and picture quality are improved, but the manufacturing cost is increased
Solution Approach 1:
The patent designs a universal driver module that can control multiple LED modules through a single cable connection. This multi-functional driver reduces the number of separate driver units and cables needed, thereby lowering manufacturing costs while supporting large display sizes
Solution Approach 2:
The patent combines multiple functions (current detection, constant current regulation, and control signal generation) into a single integrated driver circuit. This consolidation reduces the number of separate components and simplifies the overall system structure, reducing manufacturing complexity and cost
3Area of stationary object
If the driver power is increased to drive more LED modules, then the display size is increased, but the heat generation problem is worsened
Solution Approach 1:
The patent segments the high-power driving function into multiple lower-power driver modules that can operate independently. Each module drives a specific set of LED modules, distributing the power load and reducing heat concentration in any single driver unit
Solution Approach 2:
The patent applies different current levels to different LED modules based on their specific requirements and thermal conditions. This localized current control allows the system to achieve large display size while managing driver power and heat generation efficiently in each region
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
The proposed solution effectively reduces heat generation and manufacturing costs by optimizing the LED backlight structure, allowing for efficient current management and stable operation, while minimizing the thickness of connecting cables to save costs.
Implementation Method 1
the current detector may include a resistor having one end that is connected to one end of the LED array and the other end that is connected to a system ground
Data Source
AI summary
A display device is provided, which includes a light emitter including an LED array; a current detector configured to detect current that flows through the LED array; a driving circuit configured to provide constant current to the LED array; and a cable including a first line configured to provide the constant current that is provided from the driving circuit to the light emitter, and a second line configured to connect a node, to which the current detector and the driving circuit are commonly connected, and the driving circuit to each other.