Display Power Supply IC Dummy Circuit Control
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Solution Overview
Problem
Existing display apparatus power supply devices, such as switched mode power supplies, include dummy circuits to limit voltage rise, but these circuits consume excessive power when constantly operated, leading to increased energy consumption and heat generation.
Innovation Solution
A display apparatus with a power supply device that incorporates an integrated circuit (IC) chip to manage power output, including a dummy circuit that is only activated when the voltage exceeds a threshold, thereby reducing unnecessary power consumption and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dummy circuit is constantly operated to limit voltage rise, then voltage stability is improved, but power consumption increases
Solution Approach 1:
The dummy circuit operation is made dynamic rather than static. The control signal dynamically adjusts the dummy circuit's operational state based on real-time backlight control signal presence, transitioning between active and inactive states to optimize the balance between voltage stability and power consumption.
Solution Approach 2:
The system uses the existing backlight control signal to automatically control the dummy circuit operation without requiring additional sensing circuits or control mechanisms. The dummy circuit self-regulates its power consumption based on the presence or absence of the backlight control signal.
2Reliability
If the dummy circuit is constantly operated to prevent voltage rise, then safety is improved, but heat generation increases
Solution Approach 1:
The dummy circuit operates periodically rather than continuously. It activates only during periods when the backlight control signal is present and deactivates when the signal is absent, creating a periodic operation pattern that reduces cumulative heat generation while maintaining safety during active periods.
3Reliability
If the dummy circuit is constantly operated to limit voltage rise, then voltage control is improved, but manufacturing cost increases
Solution Approach 1:
The backlight control signal serves dual purposes: it controls the backlight brightness and simultaneously controls the dummy circuit operation. This multi-functionality eliminates the need for separate control circuits, reducing component count and manufacturing complexity while maintaining effective voltage control.
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 reduces power consumption and manufacturing costs by eliminating unnecessary circuit configurations, enhances safety by discharging overvoltage, and minimizes heat generation by optimizing dummy circuit operation.
Implementation Method 1
a dummy circuit which limits a voltage rise of a first output end
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A display apparatus comprises a power supply apparatus. The power supply apparatus includes a power supply unit and an integrated circuit (IC) chip. The power supply unit outputs first power for driving a backlight and second power for driving a main circuit. The IC chip increases a current value of the second power when a control signal for adjusting the brightness of the backlight is received, and decreases the current value of the second power when the control signal is not received for a first threshold time.