Display device, display method, and multimedia transmission method
Provided are a display device configuring a multi-display and a display method. The multi-media display receives a DisplayPort signal from outside, converts the received signal into a set of LVTTL signals, converts a portion of the LVTTL signals into a high-quality image signal capable of using HDMI to display multimedia on a corresponding display device, and converts another portion of the LVTTL signals into a DisplayPort signal to transmit the DisplayPort signal to another display device. Accordingly, an infinite multi-display can display high quality multimedia.
1. A display device among at least one or more display devices that are connected through an interface of digital multimedia and configured as a multi-display, the display device comprising:
a first reception unit configured to receive a first DisplayPort signal from a first transmission unit of a previous display device by a first aux channel, decrypt the first DisplayPort signal, wherein the first DisplayPort signal is encrypted based on High-Bandwidth Digital Content Protection (HDCP) by the previous display device, divide the first DisplayPort signal into a digital video signal and a digital audio signal, and convert the digital video signal into a first Transistor-Transistor Logic (TTL) signal and a second Transistor-Transistor Logic (TTL) signal;
a conversion unit configured to convert the first TTL signal into a high-quality image signal;
a display unit configured to display the high-quality image signal; and
a transmission unit configured to receive the second TTL signal, convert the second TTL signal and the digital audio signal into a second DisplayPort signal, encrypt the second DisplayPort signal based on HDCP, and transmit the encrypted second DisplayPort signal to a next display device by a second aux channel,
wherein the second DisplayPort signal is received and decrypted by the next display device,
wherein the first and second aux channel corrects a gain when the first DisplayPort signal is deteriorated,
wherein the first TTL signal is displayed by being converted into the high-quality image signal at the display device, and
wherein the second TTL signal is transmitted to the next display device by being converted into the second DisplayPort signal, to display a high-quality image signal at the next display device.
2. The display device according to claim 1 , wherein each of the first TTL signal and the second TTL signal is a Low Voltage Transistor-Transistor Logic (LVTTL) signal.
3. The display device according to claim 1 , wherein the conversion unit converts the first TTL signal into a Transition Minimized Differential Signaling (TMDS) signal that is used in High Definition Multimedia Interface (HDMI).
4. The display device according to claim 1 , wherein the previous display device includes one of a broadcast receiver, a multimedia storage apparatus, a set-top box, and another display device.
5. The display device according to claim 2 , wherein the Low Voltage Transistor-Transistor Logic (LVTTL) signal recognizes signal of 2V or higher as 1 and recognizes signal of 0.8V or less as 0.
6. A method of displaying a display device, the display method comprising:
receiving a first DisplayPort signal from a first transmission unit of a previous display device by a first aux channel, the first DisplayPort signal being encrypted based on High-Bandwidth Digital Content Protection (HDCP) by the previous display device;
decrypting the encrypted first DisplayPort signal;
dividing the decrypted first DisplayPort signal into a digital video signal and a digital audio signal;
converting the digital video signal into a first Transistor-Transistor Logic (TTL) signal and a second Transistor-Transistor Logic (TTL) signal;
converting the first TTL signal into a high-quality image signal;
displaying the high-quality image signal;
converting the second TTL signal and the digital audio signal into a second DisplayPort signal;
encrypting the second DisplayPort signal based on HDCP; and
transmitting the encrypted second DisplayPort signal to a next display device by a second aux channel,
wherein the second DisplayPort signal is received and decrypted by the next display device,
wherein the first and second aux channel corrects a gain when the first DisplayPort signal is deteriorated,
wherein the first TTL signal is displayed by being converted into the high-quality image signal at the display device, and
wherein the second TTL signal is transmitted to the next display device by being converted into the second DisplayPort signal, to display a high-quality image signal at the next display device.
7. The display method according to claim 6 , wherein each of the first TTL signal and the second TTL signal is a Low Voltage Transistor-Transistor Logic (LVTTL) signal.
8. The display method according to claim 6 , wherein the converting comprises converting the first TTL signal into a Transition Minimized Differential Signaling (TMDS) signal that is used in High Definition Multimedia Interface (HDMI).
9. The display method according to claim 7 , wherein the Low Voltage Transistor-Transistor Logic (LVTTL) signal recognizes signal of 2V or higher as 1 and recognizes signal of 0.8V or less as 0.