Display Device Multi-Point Recognition via Single USB Interface
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Solution Overview
Problem
Existing display systems require multiple ports and cables or dedicated device drivers to recognize multiple pointing devices, making it cumbersome to handle multiple indication positions simultaneously.
Innovation Solution
A display device configured with a USB standard interface, including a storage section for configuration information, a display section, a detector for position detection, and a supply section to assign coordinate data to the host device, allowing multiple indication bodies to be recognized as pointing devices without the need for additional drivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple USB ports and cables are used to connect multiple pointing devices, then multiple indication positions can be recognized, but the hardware complexity and ease of operation deteriorate
Solution Approach 1:
The patent combines multiple interface functions into a single USB connection. The display device integrates both video output and pointing device recognition functions through one USB cable, eliminating the need for multiple separate connections. This merging approach allows multiple indication positions to be recognized while reducing hardware complexity.
Solution Approach 2:
The USB interface is configured to serve multiple functions simultaneously - it acts as both a video transmission channel and a pointing device input channel. This multi-functionality enables the single connection to handle both display output and multiple pointing device inputs, improving versatility without increasing hardware complexity.
2Adaptability or versatility
If dedicated device drivers are installed to recognize multiple pointing devices, then multiple indication positions can be recognized, but the ease of operation and installation complexity worsen
Solution Approach 1:
The system implements automatic driver installation and configuration through the USB enumeration process. When pointing devices are connected, the host device automatically detects them and installs appropriate drivers without requiring user intervention. This self-service approach enables multiple indication positions to be recognized while maintaining ease of operation.
Solution Approach 2:
The display device pre-configures the USB interface to support multiple pointing device types. By preparing the interface in advance with appropriate configuration information and driver files, the system enables automatic recognition and setup of multiple indication devices without requiring users to manually install drivers.
3Device complexity
If a single USB cable is used to connect display and pointing functions, then hardware complexity is reduced, but the ability to recognize multiple pointing devices may deteriorate
Solution Approach 1:
The USB interface is segmented into multiple logical channels or endpoints, with each endpoint dedicated to handling a specific pointing device. This segmentation allows the single physical connection to carry multiple distinct pointing device signals, maintaining hardware simplicity while enabling recognition of multiple indication bodies.
Solution Approach 2:
The patent transitions from physical multi-connectivity to logical multi-functionality within a single connection. By adding the dimension of logical interface multiplexing, the system enables multiple pointing device recognition through one cable, resolving the contradiction between hardware simplicity and functional versatility.
Data Source
AI summary
A display device can make it possible to easily recognize a plurality of indication bodies as a plurality of pointing devices. The display device is provided with a function device having a first interface and a second interface, and stores configuration information assigning the same class to the first interface and the second interface in a storage section. The display device detects a first position indicated by a first indication body to a display surface and a second position indicated by a second indication body to the display surface, assigns first coordinate data representing the first position to the first interface, assigns second coordinate data representing the second position to the second interface, and supplies a host device with the first coordinate data and the second coordinate data.