Display Power Converter Pulse-Skipping for Low-Load Voltage Stability
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Solution Overview
Problem
As display resolution and peak luminance increase, power consumption rises, and under low-load or no-load conditions, the supplied voltage increases, leading to inefficiencies and instability in image display apparatuses.
Innovation Solution
The image display apparatus employs a converter with switching elements that operate in a first mode with continuous switching at a first frequency and a second mode with reduced frequency or stopped switching, stabilizing the display driving voltage and reducing power consumption by adapting to load conditions and image content, such as displaying black images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the converter operates with continuous switching at high frequency to maintain stable output voltage, then voltage stability is improved, but power consumption increases under low-load conditions
Solution Approach 1:
The converter dynamically adjusts its switching frequency based on load conditions. Under heavy load, it operates at high frequency for stable voltage; under light load, it reduces frequency to save power while maintaining voltage stability through pulse-skipping mode
Solution Approach 2:
The converter changes its operating parameters (switching frequency and duty cycle) according to load demands. By varying these parameters, the system achieves both voltage stability and power efficiency across different operating conditions
2Use of energy by moving object
If the converter reduces switching frequency or stops switching under low-load conditions to reduce power consumption, then power consumption is reduced, but output voltage stability deteriorates
Solution Approach 1:
The converter uses periodic pulse-skipping action where switching occurs in bursts followed by idle periods. This periodic operation reduces average power consumption while maintaining voltage stability through controlled on-off cycles
Solution Approach 2:
The converter employs feedback control to monitor output voltage and adjust switching behavior accordingly. This ensures voltage stability is maintained even when operating in reduced-frequency or pulse-skipping modes under light load conditions
3Manufacturing precision
If display resolution and peak luminance are increased to improve image quality, then image quality is improved, but power consumption increases
Solution Approach 1:
The power supply dynamically adapts its output based on actual display content and load conditions. Even when display resolution and luminance are high, the power supply adjusts switching parameters to match actual power demands, preventing unnecessary energy consumption
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
This approach reduces output voltage fluctuations and power consumption under low-load or no-load conditions, ensuring stable display driving voltage and efficient operation.
Implementation Method 1
a converter including switching elements and configured to convert a level of an input DC voltage based on a switching operation of the switching elements and output the display driving voltage
Implementation Method 2
a resonant capacitor and a resonant inductor disposed between and respectively connected to the input terminal of the transformer and the second switching element
Data Source
AI summary
The image display apparatus according to an embodiment of the present disclosure includes: a display; a signal processing device; and a power supply to supply a display driving voltage to the display, wherein the power supply includes a converter including switching elements and to convert a level of an input DC voltage and output the display driving voltage, wherein in response to a load at an output terminal of the converter, the converter is configured to operate in a first mode, in which the switching elements perform a continuous switching operation at a first frequency, and in a second mode in which the switching elements perform the continuous switching operation and then stop the switching operation for a predetermined period or perform the switching operation at a second frequency lower than the first frequency. Accordingly, it is possible to reduce increase of output voltage under low-load or no-load conditions.