USB Interface Video Projector for Real-Time Moving Picture Display
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Solution Overview
Problem
Conventional video projectors, especially portable ones, face limitations due to bulky VGA interfaces and restricted bandwidth in WLAN 802.11a/b/g, preventing real-time display of moving pictures, and lack versatility in modern electronic devices with projection functionality.
Innovation Solution
A video projector apparatus equipped with a USB interface, including a processing circuit, storage controller, and display circuit, capable of receiving and processing USB packets for real-time display via wired or wireless USB, allowing high-speed connectivity and multifunctionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If VGA interface is used for video projection, then real-time display of moving pictures is achieved, but device size becomes bulky
Solution Approach 1:
The patent applies USB interface technology to video projection, allowing a single USB connection to handle both data transmission and power supply functions. This universal interface replaces the traditional VGA connection, enabling real-time moving picture display while significantly reducing device size and eliminating the need for separate power adapters.
2Adaptability or versatility
If WLAN 802.11a/b/g is used for wireless projection, then wireless connectivity is achieved, but bandwidth is restricted and real-time moving picture display is prevented
Solution Approach 1:
The patent transitions from WLAN 802.11a/b/g with maximum 54 Mbps bandwidth to USB 2.0 with up to 480 Mbps bandwidth. This parameter change in transmission speed enables real-time moving picture display over wireless USB connection, maintaining wireless adaptability while dramatically improving productivity through higher data transfer rates.
3Productivity
If conventional video projector with VGA port is used, then moving pictures can be transmitted, but device complexity and size increase
Solution Approach 1:
The patent uses USB interface to consolidate multiple functions into a single connection. The USB port handles video data transmission, power supply, and device communication simultaneously, replacing the VGA interface that required separate power and data connections. This reduces interface complexity while maintaining moving picture transmission capability.
4Volume of moving object
If mobile phone with projection functionality is used, then portability is improved, but projection speed and performance are limited
Solution Approach 1:
The patent changes the interface parameter from traditional mobile phone projection methods to USB interface, enabling projection speeds up to 480 Mbps. This parameter change allows mobile phones to maintain their portability advantage while achieving projection performance comparable to conventional video projectors, resolving the speed limitation.
Data Source
AI summary
An electronic device with a projection functionality includes: a universal serial bus (USB) port, a processing circuit, a storage, a storage controller and a display circuit. The USB port receives USB packets carrying a first pixel data. The processing circuit is coupled to the USB port, and converts the received USB packets into the first pixel data. The storage controller is coupled between the processing circuit and the storage, and stores the first pixel data into the storage. The display circuit is coupled to the storage controller, and generates a display driving signal according to the first pixel data stored in the storage.