A display device without HDMI interface and a method for Type interface to be compatible with HDMI

Abstract

A display device without HDMI interface, it relates to the technical field of display device. It includes: TypeC interface; TypeC protocol chip; switching chip; DP switch; and, a display main control chip provided with a DP receiving end and an HDMI receiving end; the TypeC interface is connected to the DP receiving end and the HDMI receiving end of the display main control chip through the switching chip and the DP switch; the CC pin of the TypeC interface is connected to the TypeC protocol chip, which is used for the TypeC protocol chip to determine whether the transmission signal is an HDMI signal or a TypeC signal, and to determine the forward and reverse insertion state of the transmission signal; the TypeC protocol chip is also used to control the switching chip to switch the transmission signal to the forward insertion state; the TypeC protocol chip is also used to control the DP switch to connect the TypeC signal in the forward insertion state to the DP receiving end, and connect the HDMI signal in the forward insertion state to the HDMI receiving end. The above technical solution has the advantages that the TypeC interface can be compatible with HDMI signals, and is small in size and easy to carry.

Description

Technical Field

[0001] The present invention relates to the technical field of display devices, and in particular to a display device free of an HDMI interface and a method for making a Type interface compatible with HDMI. Background Art

[0002] With the increasing number of Type C signal devices, portable display devices are becoming more and more popular. Because the Type C interface is small in size and can supply power and output signals at the same time, portable display devices all use the Type C interface.

[0003] However, existing display devices are also provided with HDMI interfaces, which makes the display devices larger in size and not very convenient to carry. Summary of the invention

[0004] The purpose of the present invention is to provide a display device without an HDMI interface in view of the defects and shortcomings of the prior art, which has the advantages that the Type C interface is compatible with HDMI signals and is small in size and easy to carry.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a display device without HDMI interface, comprising: a TypeC interface; a TypeC protocol chip; a switching chip; a DP switch; and a display main control chip provided with a DP receiving end and an HDMI receiving end; the TypeC interface is connected to the DP receiving end and the HDMI receiving end of the display main control chip through the switching chip and the DP switch; the CC pin of the TypeC interface is connected to the TypeC protocol chip, and is used for the TypeC protocol chip to determine whether the transmission signal is an HDMI signal or a TypeC signal, and to determine the forward and reverse insertion status of the transmission signal; the TypeC protocol chip is also used to control the switching chip to switch the transmission signal to the forward insertion state; the TypeC protocol chip is also used to control the DP switch to connect the TypeC signal in the forward insertion state to the DP receiving end, and to connect the HDMI signal in the forward insertion state to the HDMI receiving end.

[0006] The present invention is further arranged that the display device free of HDMI interface also includes a selection switch; the CC pin of the TypeC interface is respectively connected to the hot plug detection end of the TypeC protocol chip and the display main control chip through the selection switch; the TypeC interface multiplexes the TypeC protocol signal and the hot plug signal to the CC pin through the selection switch; in the initial state, the selection switch is connected to the TypeC protocol chip.

[0007] The present invention further provides that the model of the display main control chip is RTD2795UT.

[0008] The present invention further provides that the model of the switching chip is TI460. .

[0009] After adopting the above technical solution, the beneficial effect of the present invention is that the Type C interface is compatible with the HDMI input source, so that the display device does not need to be provided with an HDMI interface, can be made smaller, and is more convenient to carry.

[0010] A method for making a Type interface compatible with HDMI, characterized by comprising the following steps:

[0011] S1. In the initial state, the Type C protocol chip is connected to the Type C interface through the selection switch, and the Type C protocol chip communicates with the inserted device through the CC pin of the Type C interface to determine whether the input signal is an HDMI signal or a Type C signal, and at the same time determines the forward and reverse insertion state of the transmission signal; when the communication is successful, the input signal is a Type C signal, when the communication is unsuccessful, the input signal is an HDMI signal, and the Type C protocol chip determines the forward and reverse insertion state of the input signal according to the grounding state of the CC pin;

[0012] S2. When the TypeC protocol chip determines that the input signal is a TypeC signal and the TypeC signal is in a forward plug-in state, the switching chip does not switch the forward and reverse states of the TypeC signal; when the TypeC protocol chip determines that the input signal is a TypeC signal and the TypeC signal is in a reverse plug-in state, the TypeC protocol chip controls the switching chip to switch the TypeC signal to a forward plug-in state; when the TypeC protocol chip determines that the input signal is an HDMI signal and the HDMI signal is in a forward plug-in state, the switching chip does not switch the forward and reverse states of the HDMI signal; when the TypeC protocol chip determines that the input signal is an HDMI signal and the HDMI signal is in a reverse plug-in state, the TypeC protocol chip controls the switching chip to switch the HDMI signal to a forward plug-in state;

[0013] S3. Then, when the input signal is a TypeC signal, the TypeC protocol chip controls the DP switch to connect the TypeC signal in the normal plugging state to the DP receiving end of the display main control chip; when the input signal is an HDMI signal, the TypeC protocol chip controls the DP switch to connect the HDMI signal in the normal plugging state to the HDMI receiving end of the display main control chip;

[0014] S31, when the input signal is an HDMI signal, after executing step S3, the TypeC protocol chip reverses the control selection switch to connect the CC pin of the TypeC interface to the hot plug detection terminal of the display main control chip;

[0015] S4. The display main control chip processes the received Type C signal or HDMI signal and outputs it to the processor.

[0016] After adopting the above technical solution, the beneficial effect of the present invention is: the TypeC interface is compatible with the HDMI input source, and can be used regardless of whether the input is a TypeC signal or an HDMI signal, so that the display device does not need to be set up with an HDMI interface, and can be made smaller and more portable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 is a block diagram of the present invention;

[0019] Figure 2 It is a flow chart of the present invention.

[0020] Explanation of the accompanying drawings: 1. Type C interface; 2. Selection switch; 3. Type C protocol chip; 4. Switching chip; 5. DP switch; 6. DP receiving end; 7. HDMI receiving end; 8. Display main control chip. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0022] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. After reading this specification, those skilled in the art can make non-creative modifications to this embodiment as needed, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

[0023] This embodiment relates to a display device without an HDMI interface, such as Figure 1 As shown, it includes: a Type C interface 1; a Type C protocol chip 3; a switching chip 4; a DP switch 5; and a display main control chip 8 provided with a DP receiving end 6 and an HDMI receiving end 7.

[0024] In this application, because there is a problem of the forward and reverse insertion of the device plugged into the TypeC interface 1, it needs to be swapped. The CC pin is a pair of differential signal lines in the TypeC interface 1, which is used to communicate with the TypeC protocol chip 3. HPD is the hot plug detection end of the display main control chip 8, which has only one pin. The display main control chip 8 controls this pin to inform the HDMI plug-in device whether the display end is connected. When you want to use HDMI to plug in a device, you need to first connect a cable with HDMI on one end and TypeC on the other end. HDMI is the input end and TypeC is the output end.

[0025] Specifically, the Type C interface 1 is connected to the DP receiving terminal 6 and the HDMI receiving terminal 7 of the display main control chip 8 through the switching chip 4 and the DP switch 5. The CC pin of the Type C interface 1 is connected to the Type C protocol chip 3, which is used by the Type C protocol chip 3 to determine whether the transmission signal is an HDMI signal or a Type C signal, and to determine the forward and reverse insertion state of the transmission signal. The Type C protocol chip 3 is also used to control the switching chip 4 to switch the transmission signal to the forward insertion state. The Type C protocol chip 3 is also used to control the DP switch 5 to connect the Type C signal in the forward insertion state to the DP receiving terminal 6, and to connect the HDMI signal in the forward insertion state to the HDMI receiving terminal 7.

[0026] The TypeC protocol chip 3 communicates with the inserted device through the CC pin of the TypeC interface 1. When the communication is successful, the input signal is a TypeC signal. When the communication is unsuccessful, the input signal is an HDMI signal. At the same time, the TypeC protocol chip 3 determines the forward and reverse insertion status of the input signal according to the grounding status of the CC pin. The TypeC interface 1 is compatible with HDMI signal sources, so that the display device does not need to be set up with an HDMI interface, and can be made smaller and more portable.

[0027] Specifically, the model of the display main control chip 8 is RTD2795UT. RTD2795UT has two groups of DP receiving terminals 6 and two groups of HDMI receiving terminals 7. The incoming TypeC signal is connected to the DP receiving terminal 6 (the video signal transmitted by TypeC is in DP format), and the HDMI signal is connected to the HDMI receiving terminal 7.

[0028] Specifically, in this embodiment, the model of the switch chip 4 is TI460. TI460 can swap the positive and negative of the input signal and then output it.

[0029] In other embodiments, there may be one or more Type C interfaces 1 .

[0030] The present invention also provides a method for making a Type interface compatible with HDMI, comprising the following steps: Figure 2 As shown,

[0031] S1, in the initial state, the Type C protocol chip 3 is connected to the Type C interface 1 through the selection switch, and the Type C protocol chip 3 communicates with the inserted device through the CC pin of the Type C interface 1 to determine whether the input signal is an HDMI signal or a Type C signal, and at the same time determines the forward and reverse insertion state of the transmission signal; when the communication is successful, the input signal is a Type C signal, when the communication is unsuccessful, the input signal is an HDMI signal, and the Type C protocol chip 3 determines the forward and reverse insertion state of the input signal according to the grounding state of the CC pin;

[0032] S2. When the Type C protocol chip 3 determines that the input signal is a Type C signal and the Type C signal is in a forward plug-in state, the switching chip 4 does not switch the forward and reverse states of the Type C signal; when the Type C protocol chip 3 determines that the input signal is a Type C signal and the Type C signal is in a reverse plug-in state, the Type C protocol chip 3 controls the switching chip 4 to switch the Type C signal to a forward plug-in state; when the Type C protocol chip 3 determines that the input signal is an HDMI signal and the HDMI signal is in a forward plug-in state, the switching chip 4 does not switch the forward and reverse states of the HDMI signal; when the Type C protocol chip 3 determines that the input signal is an HDMI signal and the HDMI signal is in a reverse plug-in state, the Type C protocol chip 3 controls the switching chip 4 to switch the HDMI signal to a forward plug-in state;

[0033] S3. Next, when the input signal is a Type C signal, the Type C protocol chip 3 controls the DP switch 5 to connect the Type C signal in the normal plugging state to the DP receiving end 6 of the display main control chip 8; when the input signal is an HDMI signal, the Type C protocol chip 3 controls the DP switch 5 to connect the HDMI signal in the normal plugging state to the HDMI receiving end 7 of the display main control chip 8;

[0034] S31, when the input signal is an HDMI signal, after executing step S3, the Type C protocol chip 3 reversely controls the selection switch 2, so that the CC pin of the Type C interface 1 is connected to the hot plug detection end of the display main control chip 8;

[0035] S4. The display main control chip 8 processes the received Type C signal or HDMI signal and outputs it to the processor.

[0036] This method enables the Type C interface to be compatible with the HDMI input source, and can be used regardless of whether the input is a Type C signal or an HDMI signal. It also makes it unnecessary to set up an HDMI interface for the display device using this method, so that it can be made smaller and more portable.

[0037] The above is only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A display device without HDMI interface, characterized in that: include: Type C interface (1); Type C protocol chip (3); switching chip (4); DP switch (5); and a display main control chip (8) provided with a DP receiving end (6) and an HDMI receiving end (7); The Type C interface (1) is connected to the DP receiving end (6) and the HDMI receiving end (7) of the display main control chip (8) through the switching chip (4) and the DP switch (5); The CC pin of the TypeC interface (1) is connected to the TypeC protocol chip (3), and is used for the TypeC protocol chip (3) to determine whether the transmission signal is an HDMI signal or a TypeC signal, and to determine the forward and reverse insertion status of the transmission signal; The Type C protocol chip (3) is also used to control the switching chip (4) to switch the transmission signal to a positive plug-in state; The TypeC protocol chip (3) is also used to control the DP switch (5) to connect the TypeC signal in the normal plug-in state to the DP receiving end (6), and to connect the HDMI signal in the normal plug-in state to the HDMI receiving end (7); The HDMI interface-free display device further comprises a selection switch (2); the CC pin of the Type C interface (1) is respectively connected to the Type C protocol chip (3) and the hot plug detection end of the display main control chip (8) through the selection switch (2); the Type C interface (1) multiplexes the Type C protocol signal and the hot plug signal on the CC pin through the selection switch (2); in an initial state, the selection switch (2) is connected to the Type C protocol chip (3).

2. The HDMI interface-free display device according to claim 1, characterized in that: The model of the display main control chip (8) is RTD2795UT.

3. The HDMI interface-free display device according to claim 1, characterized in that: The model of the switching chip (4) is TI460.

4. A method for making a Type interface compatible with HDMI, characterized in that: The following steps are involved: S1, in the initial state, the Type C protocol chip (3) is connected to the Type C interface (1) through the selection switch, and the Type C protocol chip (3) communicates with the inserted device through the CC pin of the Type C interface (1), determines whether the input signal is an HDMI signal or a Type C signal, and determines the forward and reverse insertion state of the transmission signal; when the communication is successful, the input signal is a Type C signal, and when the communication is unsuccessful, the input signal is an HDMI signal, and the Type C protocol chip (3) determines the forward and reverse insertion state of the input signal according to the grounding state of the CC pin; S2, when the Type C protocol chip (3) determines that the input signal is a Type C signal and the Type C signal is in a positive insertion state, the switching chip (4) does not switch the positive and negative states of the Type C signal; When the Type C protocol chip (3) determines that the input signal is a Type C signal and the Type C signal is in a reverse insertion state, the Type C protocol chip (3) controls the switching chip (4) to switch the Type C signal to a forward insertion state; When the Type C protocol chip (3) determines that the input signal is an HDMI signal and the HDMI signal is in a forward insertion state, the switching chip (4) does not switch the forward and reverse states of the HDMI signal; When the Type C protocol chip (3) determines that the input signal is an HDMI signal and the HDMI signal is in a reverse insertion state, the Type C protocol chip (3) controls the switching chip (4) to switch the HDMI signal to a normal insertion state; S3. Next, when the input signal is a Type C signal, the Type C protocol chip (3) controls the DP switch (5) to connect the Type C signal in the normal plugging state to the DP receiving end (6) of the display main control chip (8); when the input signal is an HDMI signal, the Type C protocol chip (3) controls the DP switch (5) to connect the HDMI signal in the normal plugging state to the HDMI receiving end (7) of the display main control chip (8); S4. The display main control chip (8) processes the received Type C signal or HDMI signal and outputs it to the processor.

5. The method for making the Type interface compatible with HDMI according to claim 4, characterized in that: The method further comprises S31, when the input signal is an HDMI signal, after executing step S3, the Type C protocol chip (3) reversely controls the selection switch (2) so that the CC pin of the Type C interface (1) is connected to the hot plug detection terminal of the display main control chip (8).

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