Protection Circuit for Data Driving Chip Thermal Management
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Solution Overview
Problem
Current liquid crystal television driving boards lack precise over-current protection for individual data driving chips, leading to frequent chip burnout due to high temperatures and inaccurate current sensing.
Innovation Solution
A protection circuit comprising a feedback circuit and a current adjusting circuit that adjusts the driving current based on the temperature of the data driving chip, using thermistors and resistors to generate feedback voltages that reduce the driving current when the chip's temperature increases, preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single power source IC provides power to all data driving chips, then the power supply structure is simple, but the current sensing precision is insufficient and individual chip protection is lost
Solution Approach 1:
The patent divides the single power source into multiple independent power source modules, with each module dedicated to a specific data driving chip. This segmentation enables independent current sensing and protection for each chip, resolving the contradiction between structural simplicity and sensing precision.
2Productivity
If the number of data driving chips is increased to achieve high resolution, then the display performance is improved, but the current consumption increases and chips are more prone to burnout
Solution Approach 1:
The patent implements a feedback mechanism where each power source module monitors the current consumption of its associated data driving chip and adjusts the power supply accordingly. When abnormal current is detected, the system automatically reduces or cuts off power to that specific chip, preventing burnout and improving reliability while maintaining high resolution capability.
3Productivity
If the current consumption of data driving chips is increased to achieve high frame frequency, then the display performance is improved, but the temperature increases and chips are closer to temperature limit
Solution Approach 1:
The feedback mechanism monitors temperature and current consumption in real-time. When the chip temperature approaches the limit or current consumption becomes abnormal, the system automatically adjusts the power supply to reduce heat generation, allowing the display to maintain high frame frequency operation while preventing thermal damage.
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
Effectively prevents data driving chip burnout by accurately reducing power consumption and heat dissipation, ensuring the chip operates within a safe temperature range.
Implementation Method 1
A protection circuit comprising a feedback circuit and a current adjusting circuit that adjusts the driving current based on the temperature of the data driving chip, using thermistors and resistors to generate feedback voltages that reduce the driving current when the chip's temperature increases
Data Source
AI summary
A protection circuit (10), a power supply circuit, and a display panel. The protection circuit (10) comprises a feedback circuit (100) and a current adjusting circuit (200). The reaction circuit (100) is used for receiving a supply voltage, adjust the first general resistance thereof according to the temperature of a data drive chip, and generate a reaction voltage according to the supply voltage and the adjusted first resistance. The current adjusting circuit (200) is used for receiving the supply voltage and the reaction voltage, and generate and output a driving current according to the reaction voltage and the supply voltage, the driving current decreasing following a rise in the temperature of the data drive chip; when the driving current is reduced, the thermal energy power consumption of the data drive chip is reduced so as to prevent burnout due to the temperature at the interior thereof being too high.