Display data channel switching device and display data channel switching method

Abstract

The invention disclsoes a display data channel switching device coupled between a digital image transmitting device and a digital image receiving device. The display data channel switching device comprises a display data channel,a storage unit, a switching unit, and a determination unit. The display data channel can be used to transmit the extension display identification information signals or the high-bandwidth content protection signal golden key. The storage unit is used to storing the extension display identification information data. The determination unit can be used to determine the extension display identification information data or the high-bandwidth content protection signal golden key is transmitted by the display data channel, and can be used to generate the switching signal to the switching unit according to the determination results. The switching unit can be used to couple the digital image transmitting device to the digital image receiving device selectively according to the switching signal.

Description

technical field [0001] The invention relates to the transmission of digital image signals, in particular to a display data channel switching device and a display data channel switching method. Background technique [0002] In recent years, due to the rapid development of multimedia audio-visual technology, various types of multimedia signal transmission systems and multimedia playback and display devices have appeared on the market. For example, if figure 1 As shown, a multimedia playback device 11 with a high-bandwidth digital content protection (High-bandwidth Digital Content Protection, HDCP) protection mechanism can be coupled to a display 12 through a switch 10 . Wherein, the switcher 10 includes an ASIC chip 100 and a microprocessor 102 capable of processing a high-bandwidth digital content protection signal Key (Key) and an Extended Display Identification Data (EDID) signal. However, due to the high cost of using the ASIC chip 100 in the switch 10 , for some low-end...

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Problems solved by technology

However, its disadvantage is that the time controlled by the time control unit 202 is fixed, and the switching unit 200 can only be switched once when the power is turned on. Once the control time is exceeded, the multimedia player 21 will no longer be able to read the extended display identification information storage unit. The extended display identification information in 204, that is, the multimedia playback device 21 can only read the extended display identification information once, which causes great restrictions and inconveniences in actual use.

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