CAT5 Cable Transmission System for LCD Displays
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Solution Overview
Problem
Existing solutions, such as DVI cables, are not suitable for transmitting both DDC and digital R, G, B video signals using CAT5 cables, which are commonly used in offices for networking data processing devices.
Innovation Solution
A transmission system utilizing a CAT5 cable with four circuit pairs to connect an LCD display module to a graphics card, allowing transmission of DDC and digital R, G, B video signals, while maintaining compatibility with DVI plugs on video sources and playback devices, using a transmitter and receiver with frequency separating filters and amplifiers to superimpose DDC signals onto the DVI clock signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DVI cable is used to transmit both DDC and digital R, G, B video signals, then transmission reliability is improved, but cost increases
Solution Approach 1:
The patent enables CAT5 cables, originally designed for network data transmission, to perform multiple functions including digital video signal transmission (R, G, B channels) and DDC data transmission by superimposing DDC signals onto the DVI clock signal carrier. This multi-functionality allows a single cable type to replace specialized DVI cables, reducing cost while maintaining transmission reliability through proven cable infrastructure.
Solution Approach 2:
The invention changes the signal transmission parameters by superimposing DDC data signals and clock signals onto the DVI clock signal carrier wave. This parameter modification allows multiple signal types to coexist on the same physical medium (CAT5 cable) that would otherwise be dedicated to video transmission only, enabling cost-effective use of existing cable infrastructure.
2Quantity of substance
If CAT5 cable is used for transmitting video signals, then cost is reduced, but signal transmission capability deteriorates
Solution Approach 1:
The patent introduces frequency separating filters as intermediary components at both transmitter and receiver ends. These filters act as mediators that separate the DDC signals from the DVI clock signal carrier at the receiver, enabling reliable signal extraction from the composite transmission medium. This intermediary mechanism makes CAT5 cable adaptable for dual-purpose transmission despite its original design limitations.
Solution Approach 2:
The invention utilizes electromagnetic vibration principles by superimposing DDC signals onto the higher-frequency DVI clock signal carrier. This frequency-based modulation approach allows the lower-frequency DDC signals to be carried on the higher-frequency video signal waveform, enabling CAT5 cable to transmit both signal types simultaneously despite differences in their original transmission requirements.
3Ease of operation
If DVI cable is used, then connection simplicity is improved, but adaptability to existing infrastructure deteriorates
Solution Approach 1:
The patent enables CAT5 cables to serve universal purposes by implementing video signal transmission and DDC data transmission simultaneously over the same infrastructure. This maintains connection simplicity like DVI cables while dramatically improving adaptability to existing office infrastructure where CAT5 cables are already deployed for networking, eliminating the need for separate specialized video cabling.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the use of economically priced CAT5 cables for connecting LCD display modules to personal computers, eliminating the need for expensive DVI cables while ensuring reliable transmission of video and specification information.
Implementation Method 1
a frequency separating filter (19, 20) separating the DDC data signal and DDC clock signal from the DVI clock signal
Implementation Method 2
an amplifier (22) amplifying the DDC data signal and DDC clock signal
Data Source
AI summary
In one aspect a transmission system with a transmitter which can be connected to a video source and a receiver linked to the transmitter via at least four circuit pairs, to which receiver a playback device can be connected is provided. Data is usually exchanged digitally between a graphics card in a personal computer and an LCD display module. The personal computer transmits a digital R, G, B video signal to the LCD display module via a special, so-called DVI (Digital Video Interface) cable. This DVI cable is also provided to transmit so-called DDC (Display Data Channel) data, which particularly comprises specification information of the LCD display module. A transmission system is proposed, which simplifies a connection of an LCD display module to a personal computer and with which the DVI cable can be dispensed with.