Display Power Control for USB Fast Charging Under Brightness Load
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Solution Overview
Problem
Conventional display devices are unable to supply sufficient power to external devices through external input ports, such as USB, as they provide constant power regardless of the external device's power consumption, limiting the power supply capacity and failing to support fast charging without increasing the power supply unit's capacity.
Innovation Solution
A display device with a processor that acquires brightness information to adjust power supplied to external input ports based on identified power requirements, using USB-PD or PDO methods to dynamically adjust voltage and current values, ensuring efficient power delivery within available limits, and switching between power saving and normal modes to optimize power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If constant power is supplied through external input port, then power supply stability is maintained, but power supply capacity is insufficient for fast charging
Solution Approach 1:
The patent implements dynamic power adjustment by monitoring the power consumption of the display device and adjusting the power supplied to the external input port accordingly. The processor dynamically calculates available power (total power supply capacity minus display power consumption) and adjusts voltage and current parameters in real-time, enabling the system to provide higher power for fast charging when the display consumes less power, without requiring an increased power supply unit capacity.
2Power
If power supply capacity is increased to support fast charging, then power supply capability is improved, but device size and cost increase
Solution Approach 1:
The patent changes the power supply parameters (voltage and current) dynamically based on the display's power consumption. Instead of increasing the fixed power supply capacity, the system adjusts the output parameters in real-time: when the display consumes less power, the system increases voltage and/or current to the external device to enable fast charging. This approach maintains the same power supply unit capacity while achieving higher power delivery capability.
3Productivity
If constant power is supplied to external device, then power supply simplicity is maintained, but charging speed is limited
Solution Approach 1:
The patent implements a feedback mechanism where the processor continuously monitors the display's power consumption and uses this information to adjust the power supplied to the external input port. The system receives power consumption information from the display, calculates available power, and adjusts voltage and current parameters accordingly. This closed-loop feedback enables fast charging by dynamically optimizing power delivery based on real-time system conditions.
Data Source
AI summary
A display device is disclosed. The display device may comprise: a power supply configured to generate power; an external input port, which can be connected to at least one external device; a display; and a processor configured to: acquire brightness information about the display, identify first power information required by the display based on the acquired brightness information, and adjust, based on the identified first power information and second power information provided from the power supply, power supplied to the external input port.