Remote Desktop Input Redirection for Network Projectors
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Solution Overview
Problem
Network projectors face challenges in handling smooth playback of high-definition video due to high demands on network throughput, processing power, and operating system support, and existing remote desktop solutions require client-side keyboard and mouse input for authentication and user control, which can be inconvenient and affect presentation quality.
Innovation Solution
A system that establishes a remote desktop connection between a client projector and a host computer using a private remote desktop service virtual channel, allowing the client projector to receive and inject keyboard and mouse events from the host computer, enabling user interaction with the host's keyboard and mouse devices and providing secure access credentials for seamless network projector operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional remote desktop solutions are used, then network projector can display remote desktop content, but client-side keyboard and mouse input is required for authentication and user control which reduces ease of operation
Solution Approach 1:
The patent uses the host computer's input devices (keyboard and mouse) as an intermediary to provide user control. Instead of requiring separate client-side input devices, the host's input devices are captured and redirected through the remote desktop connection, eliminating the need for additional client hardware while maintaining full user control capability.
Solution Approach 2:
The host computer's input devices serve multiple functions: they provide authentication input, user control for the remote desktop session, and can be redirected to control the remote session. This multi-functionality eliminates the need for dedicated client-side input devices and simplifies the overall system configuration.
2Manufacturing precision
If network projector is used for high definition video playback, then display quality improves, but network throughput and processing power requirements increase
Solution Approach 1:
The patent replaces traditional mechanical video signal connections with network-based virtual channel communication. By using the Remote Desktop Protocol over the network, the system substitutes physical video cables and direct graphics connections with software-based image transmission, which can handle high-definition content while distributing the processing load across the network infrastructure.
Solution Approach 2:
The system changes the transmission parameters by using compressed remote desktop images instead of raw video signals. The Remote Desktop Protocol implements efficient compression and selective updates of the desktop display, reducing the data throughput requirements compared to transmitting full-resolution video streams while maintaining high visual quality.
3Manufacturing precision
If projector is mounted high in ceiling to provide unobstructed light path, then display output quality improves, but cable length requirements become problematic
Solution Approach 1:
The network acts as an intermediary that eliminates the need for physical video cables to reach the ceiling-mounted projector. Instead of running video signals through long cable lengths to high-mounted projector inputs, the system uses wireless or wired network communication to transmit desktop images to the projector, solving the cable length problem while maintaining display quality.
Solution Approach 2:
The patent substitutes mechanical cable connections with network-based image transmission. By replacing physical video signal cables with network protocol communication, the system eliminates the constraint of cable length when mounting the projector high on the ceiling, allowing optimal display positioning without cable limitations.
4Device complexity
If source device is located near the projector, then video signal transmission is simplified, but device placement and presenter location are compromised
Solution Approach 1:
The network serves as an intermediary that decouples the source device location from the projector location. Instead of requiring the source device (laptop, PC) to be physically near the projector, the system uses network communication to transmit the desktop display to the projector, allowing the source device to be positioned optimally for the presenter while the projector is mounted for optimal display.
Solution Approach 2:
The system transitions from three-dimensional physical proximity requirements to two-dimensional network connectivity. By using network communication, the source device can be located anywhere within network coverage rather than being constrained by physical distance to the projector, adding spatial freedom to device placement while maintaining signal transmission capability.
Data Source
AI summary
A system for establishing a remote desktop connection between a client projector and a host computer, the client projector and the host computer being connected by a network. A private remote desktop service virtual channel is established between the host computer and the client projector. In the client projector, a processor initiates a remote desktop connection process, and completes a remote desktop connection to the host computer. The client projector receives keyboard and mouse events from the host computer across the private remote desktop service virtual channel. The keyboard or mouse events received by the client projector are injected into an operating system of the client projector. They are interpreted by a client application remote desktop connection as a valid input device event, and forwarded to the host computer to actuate a graphical user interface of a remote desktop session.