Heat Blocking Circuit for LCD Data Driver Overheating
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Solution Overview
Problem
The increasing load on data driving circuits in larger and higher resolution liquid crystal display (LCD) panels leads to heating issues, potentially damaging the circuitry.
Innovation Solution
A display apparatus and method that incorporates a heat blocking circuit to monitor load current and compare it with a reference voltage, generating a control signal to shut down the data driver circuit when the load current exceeds a safe threshold, preventing overheating and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the display panel size and resolution are increased, then the display quality is improved, but the load on the data driving circuit increases causing heating and potential damage
Solution Approach 1:
The patent implements a load monitoring mechanism that proactively detects current levels before overheating occurs. The monitor continuously tracks the load current supplied to the data driver circuit, and the controller prepares shutdown signals in advance when threshold values are approached, preventing thermal damage before it happens.
Solution Approach 2:
The patent establishes a closed-loop feedback system where the monitor detects load current and feeds this information to the controller, which then adjusts the power supply state accordingly. This feedback mechanism enables real-time adaptation of the power delivery based on actual circuit conditions, preventing overheating while supporting high-resolution displays.
2Productivity
If the load current increases to support higher resolution displays, then the display capability is improved, but the data driver circuit may be damaged by excessive heating
Solution Approach 1:
The system proactively monitors load current and prepares protective shutdown signals before thermal damage can occur. By detecting current thresholds in advance and pre-positioning control signals, the system protects the data driver circuit while maximizing its operational capability for high-resolution displays.
Solution Approach 2:
The patent introduces a monitor and controller as intermediary components between the power supply and the data driver circuit. These intermediaries detect load conditions and mediate power delivery, allowing the system to support high current demands for high-resolution displays while preventing excessive current from damaging the circuit through automated protective shutdown.
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 the data driver circuit from being damaged by excessive heating due to increased load, ensuring the longevity and reliability of the display apparatus.
Implementation Method 1
an operational amplifier comprising a non-inverting terminal connected to a voltage line, which is connected to the voltage generator and transfers the driving voltage through a first resistor, an inverting terminal connected to the voltage line through a second resistor
Implementation Method 2
an operational amplifier comprising a non-inverting terminal connected to a voltage line, which is connected to the voltage generator and transfers the driving voltage through a first resistor, an inverting terminal connected to the voltage line through a second resistor
Implementation Method 3
a monitor transistor connected to an output terminal of the operational amplifier and the non-inverting terminal, and configured to output the load current voltage
Implementation Method 4
a comparator including a non-inverting terminal which is configured to receive the load current voltage and an inverting terminal which is configured to receive the reference voltage
Data Source
AI summary
A display apparatus comprises a display panel including a plurality of data lines and a plurality of gate lines, a data driver circuit configured to convert image data to a grayscale voltage and to output the grayscale voltage to a data line, a voltage generator configured to provide the data driver circuit to a driving voltage, and a heat blocking circuit configured to compare a load current voltage with a reference voltage and to output a control signal for controlling the data driver circuit, the load current voltage being proportionate to a load current flowing toward the data driver circuit.