Hybrid USB-C Port Bypasses iGPU for dGPU Graphics
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Solution Overview
Problem
Existing head-mounted display systems require multiple buses to transmit high-quality graphics, limiting bandwidth and requiring additional ports, which complicates the architecture and reduces image quality when using a dedicated discrete graphics processing unit (dGPU).
Innovation Solution
A hybrid USB-C interface management system that bypasses the integrated graphics processing unit (iGPU) to directly connect the dGPU to the USB-C port, allowing the USB-C port to operate in alternate modes to support higher bandwidth DisplayPort standards, eliminating the need for a second USB-C port and simplifying the architecture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple buses are used to transmit high-quality graphics, then image quality can be maintained, but device complexity increases and bandwidth is limited
Solution Approach 1:
The patent combines multiple bus functions (DisplayPort and USB) into a single hybrid USB-C interface. The USB-C port operates in alternate mode to carry DisplayPort signaling, eliminating the need for separate DisplayPort and USB connections. This merging reduces the number of ports and simplifies the overall system architecture while maintaining the capability to transmit high-quality graphics data.
Solution Approach 2:
The USB-C interface is designed with multi-functionality, capable of operating in both standard USB mode and DisplayPort alternate mode. This universal interface can adapt to different connection requirements: when a dGPU is detected, it switches to DisplayPort mode for high-quality graphics transmission; otherwise, it functions as a standard USB port. This eliminates the need for dedicated separate ports for different functions.
2Power
If multiple ports are used to support dGPU connections, then bandwidth requirements are met, but device complexity increases
Solution Approach 1:
The patent merges the functionality of multiple ports into a single hybrid USB-C interface. By combining DisplayPort and USB capabilities in one port, the system achieves the required bandwidth for high-quality graphics transmission without needing separate DisplayPort and USB ports. This reduces the total number of ports while maintaining adequate bandwidth through the high-capacity USB-C connection operating in DisplayPort alternate mode.
3Ease of operation
If iGPU is used as an intermediary between dGPU and USB-C port, then connection is established, but transmission quality degrades
Solution Approach 1:
The patent extracts the iGPU from the graphics data transmission path between the dGPU and USB-C port. By creating a direct connection route that bypasses the iGPU, the system eliminates the quality degradation that would occur through the integrated graphics processing unit. The dGPU connects directly to the USB-C port operating in DisplayPort alternate mode, ensuring high-quality transmission without intermediary processing.
Data Source
AI summary
An information handling system with a hybrid Universal Serial Bus Type-C (USB-C) port architecture and method for operating the same comprising a USB-C port for communicating display graphics signals to a plurality of peripheral device types attachable to the USB-C port where the USB-C port is operably connected to a high throughput data translation hub via a first data bus capable of transmitting the display graphics signal at least at 8.1 Gbit/s across at least four lanes and the high throughput data translation hub is operably connected to a dedicated discrete graphics processing unit (dGPU) and operably connected to a CPU with integrated GPU (iGPU) operating with lower graphics processing capacity and power than the dGPU. A USB-C controller executing code instructions of the hybrid USB-C head mounted display interface management system to instruct the USB-C port to operate in a first mode or in a second mode depending on identification of a peripheral device type attached to the USB-C port where the USB-C port is operably connected to a first multiplexing circuit via a second data bus for transmitting USB data wherein the first multiplexing circuit is capable of operating in the first mode to operably connect USB data from the USB-C port to the USB-C controller, and the first multiplexing circuit is capable of operating in the second mode to operably connect the dGPU to the USB-C port via a USB data line parallel to the first data bus.