TWI544801B - Display data channel switching apparatus and display data channel switching method - Google Patents

Description

Display data channel switching device and display data channel switching method

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.

In recent years, due to the rapid development of multimedia audio and video technology, various types of multimedia signal transmission systems and multimedia playback and display devices have appeared on the market. For example, as shown in FIG. 1 , the multimedia playback device 11 having a high-bandwidth digital content protection (HDCP) protection mechanism can be coupled to the display 12 via the switch 10 . The switch 10 includes a special application integrated circuit chip 100 and a microprocessor 102 that can process a high-frequency wide-digit content protection signal key and an extended display identification data (EDID) signal. However, since the cost of the switch 10 for the special application integrated circuit chip 100 is relatively high, for some low-order models, the manufacturing cost of the product will be too high.

Further, as shown in FIG. 2, the switch 20 may include a switching unit 200, a time control unit 202, and an extended display identification information storage unit 204. However, the disadvantage is that the time controlled by the time control unit 202 is fixed, and the switching unit 200 can only switch once when the power is turned on. Once the control time is exceeded, the multimedia playback device 21 cannot read the extended display identification information storage unit again. The extension in 204 displays the identification information, that is, the multimedia playback device 21 can only perform one-time reading of the extended display identification information, resulting in great limitations and inconveniences in actual use.

Therefore, the present invention provides a display data channel switching device and a display data channel switching method to solve the above problems encountered in the prior art.

According to an embodiment of the present invention, a display data channel switching device is provided. In this embodiment, the display data channel switching device is coupled between the digital image transmitting device and the digital image receiving device. The display data channel switching device includes a display data channel, a storage unit, a switching unit, and a judging unit. The Display Data Channel (DDC) is coupled to the digital image transmission device for transmitting Extended Display Identification Data (EDID) signals or High-bandwidth Digital Content Protection (HDCP) signals. key. The storage unit is configured to store the extended display identification information. The switching unit is coupled to the digital image transmitting device and the storage unit. The determining unit is coupled between the digital image transmitting device and the switching unit for determining whether the display data channel transmits the extended display identification information signal or the high-frequency wide digital content protection signal key, and generates a switching signal to the switching unit according to the determination result. The switching unit selectively couples the digital image transmitting device to the storage unit or the digital image receiving device according to the switching signal.

In an embodiment, when the switching unit couples the digital image transmitting device to the digital image receiving device, the digital image transmitting device and the digital image receiving device perform a handshake of the high-frequency wide-digit content protection signal key.

In an embodiment, when the switching unit couples the digital image transmitting device to the storage unit, the digital image transmitting device reads the extended display identification information stored by the storage unit.

In an embodiment, the determining unit is a processing unit (PU), a microprocessor (MCU), a Field Programmable Gate Array (FPGA), or a Complex Programmable Logic Device (CPLD). ).

In one embodiment, the digital video transmission device and the digital image receiving device support a high-resolution image interface for the handshake of the high-frequency wide-digit content protection signal key.

In an embodiment, the switching unit is a switch, a selector, or a multiplexer.

In an embodiment, the determining unit determines whether the display data channel transmits the extended display identification information signal or the high-frequency wide digital content protection signal key according to whether the position information of the signal is a value.

In another embodiment, the display data channel switching device is coupled between the digital image transmitting device and the digital image receiving device. The display data channel switching device includes a display data channel, a storage unit, a channel selection unit, and a determination unit. The display data channel is coupled to the digital image transmission device for transmitting the extended display identification information signal or the high frequency wide digital content protection signal key. The storage unit is configured to store the extended display identification information. The channel selection unit has a first channel coupled to the digital image transmitting device and the storage unit, and a second channel coupled to the digital image transmitting device and the digital image receiving device. The determining unit is coupled between the digital image transmitting device and the channel selecting unit to determine whether the display data channel transmits the extended display identification information signal or the high-frequency wide digital content protection signal key, and generates a channel selection signal to the channel according to the determination result. Select the unit. The channel selection unit selectively reads the extended display identification information signal of the first channel or the high-frequency wide digital content protection signal key of the second channel according to the channel selection signal.

Another embodiment of the present invention is a method of switching a display data channel. In this embodiment, the display data channel switching method is configured to operate on a display data channel switching device coupled between the digital image transmitting device and the digital image receiving device. The display data channel switching device includes a storage unit and a display data channel coupled to the digital image transmission device. The method comprises the steps of: (a) storing the extended display identification information data in the storage unit; (b) transmitting the extended display identification information signal or the high-frequency wide-digit content protection signal key in the display data channel; (c) determining the display data channel to transmit Extending the identification information signal or the high-frequency wide-digit content protection signal key, and generating a switching signal according to the determination result; (d) selectively coupling the digital image transmission device to the storage unit or the digital image receiving device according to the switching signal.

In another embodiment, the method includes the steps of: (a) storing the extended display identification information data in the storage unit; and (b) transmitting the extended display identification information signal or the high-frequency wide-digit content protection signal key to the display data channel; c) judging that the display data channel transmits an extended display identification information signal or a high-frequency wide digital content protection signal key, and generates a switching signal according to the judgment result; (d) if the judgment result of the step (c) is an extended display identification information signal, And reading the extended display identification information signal between the digital image transmitting device and the storage device, and if the judgment result in the step (c) is the high-frequency wide digital content protection signal key, reading the high-frequency width between the digital image transmitting device and the digital image receiving device Digital content protection signal key.

Compared with the prior art, the display data channel switching device and the display data channel switching method proposed by the present invention selectively transmit the identification information signal or the high-frequency wide digital content protection signal key through the automatic judgment display data channel. The switching digital image transmitting device is coupled to the storage unit or the digital image receiving device, so that the limitation that only the extended display identification information can be read at one time in the prior art can be eliminated, and the special application integrated with high cost is not required. The circuit chip simultaneously processes the high-frequency wide-digit content protection signal key and the extended display identification information signal, and can simultaneously perform arbitrary reading of the extended display identification information and the high-frequency wide digital content protection signal with the display device with low cost and low design complexity. Key communication.

The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.

A preferred embodiment of the present invention is a display data channel switching device. In this embodiment, the display data channel switching device is coupled between the digital image transmitting device and the digital image receiving device. Please refer to FIG. 3, which is a schematic diagram of the display data channel switching device of this embodiment.

As shown in FIG. 3, the display data channel switching device 3 is coupled between the digital image transmitting device DT and the digital image receiving device DR. The display data channel switching device 3 includes a Display Data Channel (DDC) 30, a storage unit 32, a switching unit 34, and a determination unit 36. The display data channel 30 is coupled to the digital image transmission device DT; the storage unit 32 is coupled to the switching unit 34; the switching unit 34 is coupled to the digital image transmission device DT and the storage unit 32; the determination unit 36 is coupled to the digital image transmission device DT and Switching between units 34.

In this embodiment, the display data channel 30 is configured to transmit an Extended Display Identification Data (EDID) signal EDID or a High-bandwidth Digital Content Protection (HDCP) signal key HDCP Key. The storage unit 32 is configured to store the extended display identification information. The determining unit 36 is configured to determine the display data The signal transmitted by the track 30 is an extended display identification information signal EDID or a high-frequency wide-digit content protection signal key HDCP Key, and the switching signal SW is generated to the switching unit 34 according to the determination result. The switching unit 34 selectively couples the digital image transmitting device DT to the storage unit 32 or the digital image receiving device DR according to the switching signal SW.

In the actual application, the determining unit 36 determines whether the display data channel 30 transmits the extended display identification information signal EDID or the high frequency width according to whether the position information of the signal transmitted by the data channel 30 is a value (for example, location information Address=A0). Digital content protection signal key HDCP Key.

For example, if the location information Address=A0 of the signal transmitted by the data channel 30 is displayed, the determining unit 36 determines that the display data channel 30 transmits the extended display identification information signal EDID, and generates a switching signal SW to switch according to the determination result. In the unit 34, the switching unit 34 couples the digital image transmitting device DT to the storage unit 32 according to the switching signal SW. After the switching unit 34 couples the digital image transmitting device DT to the storage unit 32, the digital image transmitting device DT can read the extended display identification information stored by the storage unit 32.

If the location information Address ≠ A0 of the signal transmitted by the data channel 30 is displayed, the determining unit 36 determines that the display data channel 30 transmits the high-frequency wide-digit content protection signal key HDCP Key, and generates a switching signal SW to the switching unit according to the determination result. 34. The switching unit 34 couples the digital image transmitting device DT to the digital image receiving device DR according to the switching signal SW. When the switching unit 34 couples the digital image transmitting device DT to the digital image receiving device DR, the digital high-definition digital content protection signal key HDCP Key will be handed over between the digital image transmitting device DT and the digital image receiving device DR.

In practical applications, digital image transmission device DT and digital image reception The device DR supports a high-resolution image interface that can perform high-bandwidth digital content protection signal key handshake. The determining unit 36 may be a processing unit (PU), a microprocessor (MCU), a Field Programmable Gate Array (FPGA), or a Complex Programmable Logic Device (CPLD). The switching unit 34 can be a switch, a selector, or a multiplexer. However, they are not limited to the above.

Another preferred embodiment of the present invention is a display data channel switching device. In this embodiment, the display data channel switching device is coupled between the digital image transmitting device and the digital image receiving device. Please refer to FIG. 4, which is a schematic diagram of the display data channel switching device of this embodiment.

As shown in FIG. 4, the display data channel switching device 4 is coupled between the digital image transmitting device DT and the digital image receiving device DR. The display data channel switching device 4 includes a display data channel 40, a storage unit 42, a channel selection unit 44, and a determination unit 46. The channel selection unit 44 has a first channel CH1 coupled to the digital image transmitting device DT and the storage unit 42 and a second channel CH2 coupled to the digital image transmitting device DT and the digital image receiving device DR. The display data channel 40 is coupled to the digital image transmission device DT; the determination unit 46 is coupled to the display data channel 40. The first channel CH1 and the second channel CH2 may be formed by displaying data channels.

In this embodiment, the display data channel 40 is configured to transmit an extended display identification information signal EDID or a high frequency wide digital content protection signal key HDCP Key. The storage unit 42 is configured to store the extended display identification information. The determining unit 46 is configured to determine whether the signal transmitted by the display data channel 40 is an extended display identification information signal EDID or a high-frequency wide-digit content protection signal key HDCP Key, and generate a channel selection signal CS to the channel selection according to the determination result. Select unit 44. The channel selection unit 44 selectively reads the extended display identification information signal EDID of the first channel CH1 or the high frequency wide digital content protection signal key HDCP Key of the second channel CH2 according to the channel selection signal CS.

In the actual application, the determining unit 46 determines whether the display data channel 40 transmits the extended display identification information signal EDID or the high frequency wide digit according to whether the position information of the signal transmitted by the display data channel 40 is a value (for example, the location information Address=A0). Content protection signal key HDCP Key.

For example, if the location information Address=A0 of the signal transmitted by the data channel 40 is displayed, the determining unit 46 determines that the display data channel 40 transmits the extended display identification information signal EDID, and generates a channel selection signal CS according to the determination result. Channel selection unit 44. The channel selection unit 44 reads the extended display identification information signal EDID of the first channel CH1 according to the channel selection signal CS. At this time, the digital image transmission device DT will read the extended display identification information stored by the storage unit 42.

If the location information Address ≠ A0 of the signal transmitted by the data channel 40 is displayed, the determining unit 46 determines that the display data channel 40 transmits the high-frequency wide-digit content protection signal key HDCP Key, and generates a channel selection signal CS to the channel according to the determination result. Unit 44 is selected. The channel selection unit 44 reads the high-frequency wide-digit content protection signal key HDCP Key of the second channel CH2 according to the channel selection signal CS. At this time, the high-frequency wide-digit content protection signal is performed between the digital image transmission device DT and the digital image receiving device DR. The key to the key HDCP Key.

Another embodiment of the present invention is a method of switching a display data channel. In this embodiment, the display data channel switching method is configured to operate on a display data channel switching device coupled between the digital image transmitting device and the digital image receiving device. Display data channel switching device includes storage unit and coupling The display data channel of the digital image transmission device. Please refer to FIG. 5, which is a flow chart showing the method for switching the display data channel of this embodiment.

As shown in FIG. 5, in step S10, the method stores extended display identification information (EDID) data in the storage unit. In step S12, the method transmits an extended display identification information signal or a high-bandwidth digital content protection signal key to the display data channel. In step S14, the method determines that the display data channel transmits an extended display identification information (EDID) signal or a high frequency wide digital content protection (HDCP) signal key. If the result of the determination in step S14 is that the display data channel transmits an extended display identification information (EDID) signal, the method performs step S16 to couple the digital image transmission device to the storage unit. Then, the method performs step S17, and the digital image transmitting device reads the extended display identification information stored by the storage unit.

If the result of the determination in step S14 is that the display data channel transmits a high-frequency wide digital content protection (HDCP) signal key, the method performs step S18 to couple the digital image transmission device to the digital image receiving device. Then, the method performs step S19, and the digital video transmission device and the digital image receiving device perform the handshake of the high-frequency wide digital content protection (HDCP) signal key.

Another embodiment of the present invention is a method of switching a display data channel. In this embodiment, the display data channel switching method is configured to operate on a display data channel switching device coupled between the digital image transmitting device and the digital image receiving device. The display data channel switching device includes a storage unit and a display data channel coupled to the digital image transmission device. Please refer to FIG. 6. FIG. 6 is a flow chart showing the method for switching the display data channel of this embodiment.

As shown in FIG. 6, in step S20, the method stores the extended display identification information material in the storage unit. In step S22, the method transmits an extended display identification information signal or a high-bandwidth digital content protection signal key to display the data transmission. Road. In step S24, the method determines that the display data channel transmits an extended display identification information signal or a high-frequency wide digital content protection signal key.

If the result of the determination in step S24 is that the display data channel transmits an extended display identification information (EDID) signal, the method proceeds to step S26 to read the extended display identification information signal between the digital image transmitting device and the storage device.

If the result of the determination in step S24 is that the display data channel transmits a high-frequency wide digital content protection (HDCP) signal key, the method performs step S29, and the high-definition wide digital content protection (HDCP) is performed between the digital image transmitting device and the digital image receiving device. ) The handshake of the signal key.

Compared with the prior art, the display data channel switching device and the display data channel switching method proposed by the present invention selects an extended display identification information signal or a high-frequency wide digital content protection signal key by automatically determining that the display data channel is transmitted. The switching digital image transmitting device is coupled to the storage unit or the digital image receiving device, so that the limitation that the extended display identification information can only be read at one time in the prior art can be eliminated, and the high-cost special application integrated circuit chip is not required at the same time. Processing the high-frequency wide-digit content protection signal key and extending the display identification information signal, and simultaneously capable of simultaneously reading the extended display identification information and performing the high-frequency wide-digit content protection signal key with the display device with low cost and low design complexity. Hold communication.

The features and spirit of the present invention will be more apparent from the detailed description of the preferred embodiments. On the contrary, the intention is to cover various modifications and equivalents within the scope of the invention as claimed.

S10~S29‧‧‧ Process steps

10, 20‧‧‧Switch

11, 21‧‧‧ multimedia playback device

12, 22‧‧‧ Display

100‧‧‧Special application integrated circuit crystal

102‧‧‧Microprocessor

200‧‧‧Switch unit

202‧‧‧Time Control Unit

204‧‧‧Extended display identification information storage

3, 4‧‧‧ Display data channel switching device

30, 40‧‧‧ Display data channel

32, 42‧‧‧ storage unit

34‧‧‧Switch unit

36, 46‧‧‧ judgment unit

DT‧‧‧Digital Image Transfer Device

DR‧‧‧Digital image receiving device number

EDID‧‧‧Extension display identification information

SW‧‧‧Switch signal

CS‧‧‧ channel selection signal

HDCP Key‧‧‧High-frequency wide digital content protection signal key

44‧‧‧Channel selection unit

CH1‧‧‧ first channel

CH2‧‧‧ second channel

Fig. 1 is a diagram showing a switcher of a prior art using a special application integrated circuit chip.

Fig. 2 is a diagram showing a switcher capable of providing only one-time read extended display identification information in the prior art.

3 is a schematic diagram showing a display data channel switching device according to an embodiment of the present invention.

4 is a schematic diagram showing a display data channel switching device according to another embodiment of the present invention.

FIG. 5 is a flow chart showing a method for switching data channels according to another embodiment of the present invention.

FIG. 6 is a flow chart showing a method for switching data channels according to another embodiment of the present invention.

3‧‧‧ Display data channel switching device

30‧‧‧Display data channel

32‧‧‧ storage unit

34‧‧‧Switch unit

36‧‧‧judging unit

DT‧‧‧Digital Image Transfer Device

DR‧‧‧Digital image receiving device number

EDID‧‧‧Extension display identification information

HDCP Key‧‧‧High-frequency wide digital content protection signal key

SW‧‧‧Switch signal

Claims (13)

A display data channel switching device is coupled between a digital image transmission device and a digital image receiving device. The display data channel switching device includes: a display data channel (DDC) coupled to the digital image transmission The device is configured to transmit an Extended Display Identification Data (EDID) signal or a High-bandwidth Digital Content Protection (HDCP) signal key; a storage unit for storing an extended display Identifying information information; a switching unit coupled to the digital image transmitting device and the storage unit; and a determining unit coupled between the digital image transmitting device and the switching unit for determining the transmission of the display data channel An extension display identification information signal or a high-bandwidth digital content protection signal key, and generating a switching signal to the switching unit according to the determination result; wherein the switching unit selectively couples the digital image transmission device to the switching signal according to the switching signal a storage unit or the digital image receiving device when the switching unit When the digital image transmitting device is coupled to the digital image receiving device, the digital image transmitting device and the digital image receiving device perform a high-frequency wide digital content protection (HDCP) signal key; when the switching unit sets the digital When the image transmitting device is coupled to the storage unit, the digital image transmitting device reads the extended display identification information stored by the storage unit. The display data channel switching device according to claim 1, wherein the determining unit is a processing unit (PU), a microprocessor (MCU), and a field programmable logic Field Programmable Gate Array (FPGA) or Complex Programmable Logic Device (CPLD). The display data channel switching device according to claim 1, wherein the digital image transmitting device and the digital image receiving device support a high-resolution image interface for performing high-bandwidth digital content protection signal key handshake. The display data channel switching device according to claim 1, wherein the switching unit is a switch, a selector, or a multiplexer. The display data channel switching device of claim 1, wherein the determining unit determines whether the position information of the signal transmitted by the display data channel is a value to determine that the display data channel transmits the extended display identification. Information signal or high-frequency wide digital content protection signal key. A display data channel switching device is coupled between a digital image transmission device and a digital image receiving device. The display data channel switching device includes: a display data channel (DDC) coupled to the digital image transmission The device is configured to transmit an Extended Display Identification Data (EDID) signal or a High-bandwidth Digital Content Protection (HDCP) signal key; and a storage unit for storing an extended display identification information material a channel selection unit having a first channel coupled to the digital image transmitting device and the storage unit and a second channel coupled to the digital image transmitting device and the digital image receiving device; and a determining unit coupled For the digital image transmitting device and the channel selection Between the units, it is determined that the display data channel transmits an extended display identification information signal or a high-frequency wide digital content protection signal key, and generates a channel selection signal to the channel selection unit according to the determination result; wherein the channel selection unit Selecting, according to the channel selection signal, the extended display identification information signal of the first channel or the high-frequency wide-digit content protection signal key of the second channel, when the channel selection unit reads the high-frequency wide-digit content protection signal of the second channel When the key is used, the digital image transmission device and the digital image receiving device will perform the handshake of the high-frequency wide digital content protection signal key; when the channel selection unit reads the extended display identification information signal of the first channel, The digital image transmitting device reads the extended display identification information stored by the storage unit. The display data channel switching device of claim 6, wherein the digital image transmission device and the digital image receiving device support a high-resolution image interface for performing high-bandwidth digital content protection signal key handshake. The display data channel switching device of claim 6, wherein the determining unit determines whether the display information channel transmits an extended display identification according to whether the position information of the signal transmitted by the display data channel is a value. Information signal or high-frequency wide digital content protection signal key. The display data channel switching device according to claim 6, wherein the determining unit is a processing unit (PU), a microprocessor (MCU), a Field Programmable Gate Array (FPGA), or Complex Programmable Logic Device (CPLD). A display data channel switching method is configured to be coupled to 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 comprising a storage unit and coupling the digital device One of the image transmitting devices displays a data channel, and the method comprises the steps of: (a) storing an extended display identification information data in the storage unit; (b) transmitting an extended display identification information signal or a high-bandwidth digital content protection signal key The display data channel; (c) determining that the display data channel transmits the extended display identification information signal or the high-bandwidth digital content protection signal key, and generating a switching signal according to the determination result; and (d) according to the switching signal Optionally, the digital image transmitting device is coupled to the storage unit or the digital image receiving device; wherein in the step (d), if the digital image transmitting device is coupled to the digital image receiving device, the digital image transmitting device Intersecting a high-frequency wide-digit content protection signal key with the digital image receiving device If the digital image transfer means coupled to the storage unit, the digital image transfer device to read the stored extension of the storage unit to display the data identification information. The display data channel switching method according to claim 10, wherein the digital image transmission device and the digital image receiving device support a high-resolution image interface for performing high-bandwidth digital content protection signal key handshake. A display data channel switching method for operating in a digital image a display data channel switching device between the transmitting device and the digital image receiving device, the display data channel switching device comprising a storage unit and a display data channel coupled to the digital image transmitting device, the method comprising the following steps: Storing an extended display identification information data in the storage unit; (b) transmitting an extended display identification information signal or a high-frequency wide-digit content protection signal key to the display data channel; (c) determining that the display data channel transmits an extended display Identifying the information signal or the high-frequency wide-digit content protection signal key; and (d) reading the extended display identification information signal between the digital image transmission device and the storage device if the determination result of the step (c) is an extended display identification information signal The digital image transmitting device reads the extended display identification information stored in the storage unit; if the determination result in the step (c) is a high-frequency wide digital content protection signal key, the digital image transmitting device and the digital image receiving device Intersect between the high-frequency wide-digit content protection signal key to read the digit Like High-bandwidth Digital Content Protection keys between the signal transmitting device and the digital video receiving device. The display data channel switching method according to claim 12, wherein the digital image transmission device and the digital image receiving device support a high-resolution image interface for coping with a high-frequency wide-digit content protection signal key.