Display Power Interface With Shared Cable and Ground Separation
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Solution Overview
Problem
Large display apparatuses require high power, necessitating thick cables for connection, which degrade design and user convenience, and isolated power supplies increase volume and manufacturing costs.
Innovation Solution
A display system that transmits and receives power using a single cable between an electronic device and a display apparatus, utilizing a non-isolated power transmission method with separate ground connections to reduce cable thickness and eliminate the need for isolated converters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a thick cable is used to supply high power to large display apparatuses, then power transmission capability is improved, but design quality and user convenience deteriorate
Solution Approach 1:
The patent divides the power transmission function into two separate components: a thin signal cable for control signals and a separate power cable for power supply. This segmentation allows each cable to be optimized independently - the signal cable remains thin for convenience while the power cable handles high power transmission, resolving the contradiction between power capability and user convenience.
Solution Approach 2:
The patent introduces a power adapter as an intermediary device that converts high-voltage low-current power from the wall outlet into low-voltage high-current power suitable for the display apparatus. This intermediary enables high power transmission through a thinner cable by transforming the power characteristics, thus improving both power transmission capability and user convenience.
2Reliability
If an isolated power supply configuration is used to ensure stability, then electrical stability is improved, but device volume and manufacturing cost increase
Solution Approach 1:
The patent extracts the isolation function from the display apparatus itself and relocates it to an external power adapter. By taking out the isolated converter from the display apparatus, the apparatus volume is reduced while the adapter provides the necessary electrical isolation and stability externally.
Solution Approach 2:
The power adapter serves as an intermediary that provides electrical isolation between the mains power and the display apparatus. This external mediator handles the isolation requirements, allowing the display apparatus to use simpler, non-isolated power conversion circuits, thereby reducing its volume and manufacturing cost while maintaining electrical stability.
3Reliability
If an isolated converter is used to ensure ground isolation, then electrical safety is improved, but manufacturing cost increases
Solution Approach 1:
The patent extracts the expensive isolated converter from the display apparatus and places it in the power adapter. This extraction reduces the manufacturing cost of the display apparatus itself, as the complex isolation circuitry is now in a separate, standardized adapter that can be mass-produced independently.
Solution Approach 2:
The power adapter acts as an intermediary that handles all electrical isolation and safety requirements. By concentrating these safety functions in a single external device, the overall system achieves electrical safety without requiring expensive isolated converters in each display apparatus, thereby reducing manufacturing costs.
Data Source
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AI summary
A display system is disclosed. The display system includes an electronic device including first and second interfaces and a display apparatus. The electronic device is configured to: rectify external alternating current (AC) power by direct current (DC) power based on a first ground, convert the DC power into power based on a second ground, provide the converted power to the display apparatus through a first interface connected to the second ground, and provide a signal received from an external device through a second interface connected to an earth ground to the display apparatus through the first interface, wherein a ground of the display apparatus is the same as the second ground and the second ground is different from the earth ground.