WO2022151769A1 - 一种免HDMI接口的显示设备及Type接口兼容HDMI的方法 - Google Patents

一种免HDMI接口的显示设备及Type接口兼容HDMI的方法 Download PDF

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WO2022151769A1
WO2022151769A1 PCT/CN2021/122313 CN2021122313W WO2022151769A1 WO 2022151769 A1 WO2022151769 A1 WO 2022151769A1 CN 2021122313 W CN2021122313 W CN 2021122313W WO 2022151769 A1 WO2022151769 A1 WO 2022151769A1
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typec
signal
hdmi
chip
interface
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PCT/CN2021/122313
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English (en)
French (fr)
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李�杰
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深圳市松冠科技有限公司
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Priority to US17/547,213 priority Critical patent/US11487697B2/en
Publication of WO2022151769A1 publication Critical patent/WO2022151769A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/765—Interface circuits between an apparatus for recording and another apparatus

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  • the invention relates to the technical field of display devices, in particular to an HDMI interface-free display device and a HDMI-compatible method with a Type interface.
  • TypeC signal devices With the increasing number of TypeC signal devices, portable display devices are becoming more and more popular. Because the TypeC interface is small in size and can supply power and output signals at the same time, the TypeC interface is used in portable display devices.
  • the existing display devices are also provided with HDMI interfaces, which make the display devices bulky and inconvenient to carry.
  • the purpose of the present invention is to provide an HDMI interface-free display device in view of the defects and deficiencies of the prior art, which has the advantages that the TypeC interface can be compatible with HDMI signals, and has the advantages of small size and easy portability.
  • a display device without HDMI interface comprising: TypeC interface; TypeC protocol chip; switching chip; DP switch; control chip; 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, Used for the TypeC protocol chip to determine whether the transmission signal is an HDMI signal or a TypeC signal, and to determine the positive and negative insertion state of the transmission signal; the TypeC protocol chip is also used to control the switching chip to switch the transmission signal to positive Plug-in state; the TypeC protocol chip is also used to control the DP switch to connect the TypeC signal in the plug-in state to the DP receiver, and connect the HDMI signal in the plug-in state to the HDMI receiver.
  • the present invention further provides that the HDMI interface-free display device further includes a selection switch; the CC pin of the TypeC interface is respectively hot-plugged with the TypeC protocol chip and the display main control chip through the selection switch.
  • the pull detection terminal is connected; 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 communicated with the TypeC protocol chip.
  • the present invention further provides that the model of the display main control chip is RTD2795UT.
  • the present invention further provides that the model of the switching chip is TI460.
  • the beneficial effects of the present invention are: the TypeC interface can be compatible with the HDMI input source, so that the display device does not need to be provided with an HDMI interface, and can be made smaller and more portable.
  • a method for a Type interface compatible with HDMI comprising the following steps:
  • the TypeC protocol chip In the initial state, the TypeC protocol chip is communicated with the TypeC interface through the selection switch, and the TypeC protocol chip is communicated with the plug-in device through the CC pin of the TypeC interface, and judges whether the input signal is an HDMI signal or a TypeC signal, and judges whether the transmission signal is positive or not.
  • Reverse insertion state when the connection is successful, the input signal is a TypeC signal, and when the connection is unsuccessful, the input signal is an HDMI signal, and the TypeC protocol chip judges the positive and negative insertion state of the input signal according to the grounding state of the CC pin;
  • the switching chip does not switch the positive and negative states of the TypeC signal; when the TypeC protocol chip judges that the input signal is a TypeC signal and the TypeC signal is a reverse insertion state In the state, the TypeC protocol chip controls the switching chip to switch the TypeC signal to the positive insertion state; when the TypeC protocol chip determines that the input signal is an HDMI signal and the HDMI signal is in the positive insertion state, the switching chip does not switch the positive and negative states of the HDMI signal; when When the TypeC protocol chip determines that the input signal is an HDMI signal and the HDMI signal is in the reverse insertion state, the TypeC protocol chip controls the switching chip to switch the HDMI signal to the positive insertion state;
  • the TypeC protocol chip controls the DP switch to connect the TypeC signal in the positive state to the DP receiving end of the main control chip of the display;
  • the TypeC protocol chip controls the DP switch Connect the HDMI signal in the plug-in state to the HDMI receiving end of the main control chip of the display;
  • the TypeC protocol chip reversely controls the selection switch, so that the CC pin of the TypeC interface is connected to the hot-plug detection terminal of the display main control chip;
  • the display main control chip processes the received TypeC signal or HDMI signal and outputs it to the processor.
  • the beneficial effects of the present invention are: the TypeC interface can be 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 provided with an HDMI interface, and can be made smaller and more convenient carry.
  • Fig. 1 is the block diagram of the present invention
  • Figure 2 is a flow chart of the present invention.
  • This embodiment relates to a display device without an HDMI interface, as shown in FIG. 1 , including: a TypeC interface 1; a TypeC protocol chip 3; a switching chip 4; a DP switch 5; and a DP receiving end 6 and an HDMI receiving end are provided 7 of the display main control chip 8.
  • 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 terminal of the display main control chip 8, and there is only one pin.
  • the display main control chip 8 controls this pin to inform the HDMI plug-in device whether the display terminal has been connected.
  • HDMI is the input end
  • TypeC is the output end.
  • the TypeC 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 by the TypeC protocol chip 3 to determine whether the transmission signal is an HDMI signal or a TypeC signal, and to determine the positive and negative insertion status of the transmission signal.
  • the TypeC protocol chip 3 is also used to control the switching chip 4 to switch the transmission signal to the positive insertion state.
  • the TypeC protocol chip 3 is also used to control the DP switch 5 to connect the TypeC signal in the plugging state to the DP receiving end 6 , and connect the HDMI signal in the plugging state to the HDMI receiving end 7 .
  • the TypeC protocol chip 3 is connected to the plug-in device through the CC pin of the TypeC interface 1.
  • the input signal is a TypeC signal.
  • the input signal is an HDMI signal.
  • the TypeC protocol chip 3 is based on the CC pin. The grounding state is used to judge the positive and negative insertion state of the input signal.
  • the Type C interface 1 is compatible with HDMI signal sources, so that the display device does not need to set up an HDMI interface, and can be made smaller and more portable.
  • the model of the display main control chip 8 is RTD2795UT.
  • RTD2795UT has two DP receivers 6 and two HDMI receivers 7.
  • the incoming TypeC signal is connected to the DP receiving end 6 (the video signal transmitted by TypeC is in DP format), and the HDMI signal is connected to the HDMI receiving end 7.
  • the model of the switching chip 4 is TI460.
  • the TI460 can swap the positive and negative of the input signal and then output it.
  • the present invention also provides a method for a Type interface compatible with HDMI, comprising the following steps: as shown in FIG. 2 ,
  • the TypeC protocol chip 3 communicates with the TypeC interface 1 through the selection switch, and the TypeC protocol chip 3 communicates with the plug-in device through the CC pin of the TypeC interface 1, and judges whether the input signal is an HDMI signal or a TypeC signal, and at the same time judges the The positive and negative insertion state of the transmission signal; when the connection is successful, the input signal is a TypeC signal, and when the connection is unsuccessful, the input signal is an HDMI signal, and the TypeC protocol chip 3 judges the positive state of the input signal according to the grounding state of the CC pin. anti-insertion state;
  • the switching chip 4 does not switch the positive and negative states of the TypeC signal; when the TypeC protocol chip 3 judges that the input signal is a TypeC signal and the TypeC signal When it is in the reverse insertion state, the TypeC protocol chip 3 controls the switching chip 4 to switch the TypeC signal to the positive insertion state; when the TypeC protocol chip 3 judges that the input signal is an HDMI signal and the HDMI signal is in the positive insertion state, the switching chip 4 does not switch HDMI.
  • the positive and negative state of the signal when the TypeC protocol chip 3 judges that the input signal is an HDMI signal and the HDMI signal is in the reverse insertion state, the TypeC protocol chip 3 controls the switching chip 4 to switch the HDMI signal to the positive insertion state;
  • the TypeC protocol chip 3 controls the DP switch 5 to connect the TypeC signal in the positive state to the DP receiving end 6 of the display main control chip 8;
  • the TypeC protocol The chip 3 controls the DP switch 5 to connect the HDMI signal in the plug-in state to the HDMI receiving end 7 of the display main control chip 8;
  • the TypeC protocol chip 3 inversely controls the selection switch 2, so that the CC pin of the TypeC interface 1 is connected with the hot-plug detection terminal of the display main control chip 8;
  • the display main control chip 8 processes the received TypeC signal or HDMI signal and outputs it to the processor.
  • the method enables the TypeC interface to be compatible with the HDMI input source, and can be used regardless of whether the input is a TypeC signal or an HDMI signal, and also enables a display device using this method to be made smaller and more portable without setting an HDMI interface.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Information Transfer Systems (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

一种免HDMI接口的显示设备，它涉及显示设备技术领域。它包括：TypeC接口；TypeC协议芯片；切换芯片；DP开关；以及，设有DP接收端和HDMI接收端的显示器主控芯片；所述TypeC接口通过所述切换芯片及所述DP开关连接到所述显示器主控芯片的DP接收端和HDMI接收端；所述TypeC接口的CC引脚与所述TypeC协议芯片相连，用于所述TypeC协议芯片判断传输信号是HDMI信号还是TypeC信号，以及判断所述传输信号的正反插状态；所述TypeC协议芯片还用于控制所述切换芯片将所述传输信号切换为正插状态；所述TypeC协议芯片还用于控制所述DP开关将正插状态的所述TypeC信号接到所述DP接收端，将正插状态的所述HDMI信号接到所述HDMI接收端。采用上述技术方案，具有TypeC接口能够兼容HDMI信号，且体积小、便于携带的优势。

Description

一种免HDMI接口的显示设备及Type接口兼容HDMI的方法 技术领域
本发明涉及显示设备技术领域，具体涉及一种免HDMI接口的显示设备及Type接口兼容HDMI的方法。
背景技术
随着TypeC信号设备的越来越多，便携式显示设备也越来越普及。由于TypeC接口体积小，同时能够供电和输出信号，便携式显示设备都有用到TypeC接口。
但现有的显示设备还均设有HDMI接口，使得显示设备的体积较大，携带不是很方便。
发明内容
本发明的目的在于针对现有技术的缺陷和不足，提供一种免HDMI接口的显示设备，具有TypeC接口能够兼容HDMI信号，且体积小、便于携带的优势。
为实现上述目的，本发明采用的技术方案是：一种免HDMI接口的显示设备，包括：TypeC接口；TypeC协议芯片；切换芯片；DP开关；以及，设有DP接收端和HDMI接收端的显示器主控芯片；所述TypeC接口通过所述切换芯片及所述DP开关连接到所述显示器主控芯片的DP接收端和HDMI接收端；所述TypeC接口的CC引脚与所述TypeC协议芯片相连，用于所述TypeC协议芯片判断传输信号是HDMI信号还是TypeC信号，以及判断所述传输信号的正反插状态；所述TypeC协议芯片还用于控制所述切换芯片将所述传输信号切换为正插状态；所述TypeC协议芯片还用于控制所述DP开关将正插状态的所述 TypeC信号接到所述DP接收端，将正插状态的所述HDMI信号接到所述HDMI接收端。
本发明进一步设置，所述免HDMI接口的显示设备还包括选择开关；所述TypeC接口的所述CC引脚通过所述选择开关分别与所述TypeC协议芯片及所述显示器主控芯片的热插拔检测端相连；所述TypeC接口通过所述选择开关将TypeC协议信号和热插拔信号复用于所述CC引脚；初始状态时，所述选择开关与TypeC协议芯片连通。
本发明进一步设置，所述显示器主控芯片的型号为RTD2795UT。
本发明进一步设置，所述切换芯片的型号为TI460。
采用上述技术方案后，本发明的有益效果为：TypeC接口能够兼容HDMI输入源，使得该显示设备无需设置HDMI接口，能够做得更小，更加便于携带。
一种Type接口兼容HDMI的方法，其特征在于，包括以下步骤：
S1、初始状态时，TypeC协议芯片通过选择开关与TypeC接口连通，TypeC协议芯片通过TypeC接口的CC引脚与插入设备连通，判断输入信号是HDMI信号还是TypeC信号，同时判断所述传输信号的正反插状态；当连通成功，则输入信号是TypeC信号，当连通不成功，则输入信号是HDMI信号，同时TypeC协议芯片根据CC引脚的接地的状态去判断输入信号的正反插状态；
S2、当TypeC协议芯片判断输入信号是TypeC信号、且TypeC信号为正插状态时，切换芯片不切换TypeC信号的正反状态；当TypeC协议芯片判断输入信号是TypeC信号、且TypeC信号为反插状态时，TypeC协议芯片控制切换芯片将TypeC信号切换为正插状态；当TypeC协议芯片判断输入信号是HDMI信号、且HDMI信号为正插状态时，切换芯片不切换HDMI信号的正反状态；当TypeC协议芯片判断输入信号是HDMI信号、且HDMI信号为反插状态时， TypeC协议芯片控制切换芯片将HDMI信号切换为正插状态；
S3、接着，当输入信号是TypeC信号时，TypeC协议芯片控制DP开关将正插状态的TypeC信号接到显示器主控芯片的DP接收端；当输入信号是HDMI信号时，TypeC协议芯片控制DP开关将正插状态的HDMI信号接到显示器主控芯片的HDMI接收端；
S31、当输入信号是HDMI信号时，执行完S3的步骤后，TypeC协议芯片反控制选择开关，使TypeC接口的CC引脚与显示器主控芯片的热插拔检测端连通；
S4、显示器主控芯片将接收到的TypeC信号或HDMI信号处理后输出到处理器。
采用上述技术方案后，本发明有益效果为：TypeC接口能够兼容HDMI输入源，无论输入的是TypeC信号还是HDMI信号都能够使用，使得该显示设备无需设置HDMI接口，能够做得更小，更加便于携带。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1是本发明的框图；
图2是本发明的流程图。
附图标记说明：1、TypeC接口；2、选择开关；3、TypeC协议芯片；4、切换芯片；5、DP开关；6、DP接收端；7、HDMI接收端；8、显示器主控芯片。
具体实施方式
以下结合附图对本发明作进一步详细说明。
本具体实施例仅仅是对本发明的解释，其并不是对本发明的限制，本领域技术人员在阅读完本说明书后可以根据需要对本实施例做出没有创造贡献的修改，但只要在本发明的权利要求范围内都受到专利法的保护。
本实施例涉及一种免HDMI接口的显示设备，如图1所示，包括：TypeC接口1；TypeC协议芯片3；切换芯片4；DP开关5；以及，设有DP接收端6和HDMI接收端7的显示器主控芯片8。
在此应用中，因为存在插在TypeC接口1的插入设备的正反插的问题，所以需要交换。CC引脚是TypeC接口1中的一对差分信号线，用来和TypeC协议芯片3连通。HPD是显示器主控芯片8的热插拔检测端，只有一个引脚，显示器主控芯片8控制这个引脚告知HDMI插入设备，显示端是否已经连接。当要用HDMI插入设备时，需要先外接一个一头是HDMI另外一头是TypeC的线材，HDMI是输入端，TypeC是输出端。
具体的，TypeC接口1通过切换芯片4及DP开关5连接到显示器主控芯片8的DP接收端6和HDMI接收端7。TypeC接口1的CC引脚与TypeC协议芯片3相连，用于TypeC协议芯片3判断传输信号是HDMI信号还是TypeC信号，以及判断传输信号的正反插状态。TypeC协议芯片3还用于控制切换芯片4将传输信号切换为正插状态。TypeC协议芯片3还用于控制DP开关5将正插状态的TypeC信号接到所述DP接收端6，将正插状态的HDMI信号接到HDMI接收端7。
TypeC协议芯片3通过TypeC接口1的CC引脚与插入设备连通，当连通成功，则输入信号是TypeC信号，当连通不成功，则输入信号是HDMI信号， 同时TypeC协议芯片3根据CC引脚的接地的状态去判断输入信号的正反插状态。TypeC接口1能够兼容HDMI信号源，使得该显示设备无需设置HDMI接口，能够做得更小，更加便于携带。
具体的，显示器主控芯片8的型号为RTD2795UT。RTD2795UT有两个DP接收端6和两个HDMI接收端7。TypeC信号进来是接到DP接收端6(TypeC传输的视频信号是DP格式的)，HDMI信号就连接到HDMI接收端7。
具体的，在本实施例中，切换芯片4的型号为TI460。TI460可以将输入信号的正负交换然后再输出。
在其他实施例中，可以有一个或者多个TypeC接口1。
本发明还提供一种Type接口兼容HDMI的方法，包括以下步骤：如图2所示，
S1、初始状态时，TypeC协议芯片3通过选择开关与TypeC接口1连通，TypeC协议芯片3通过TypeC接口1的CC引脚与插入设备连通，判断输入信号是HDMI信号还是TypeC信号，同时判断所述传输信号的正反插状态；当连通成功，则输入信号是TypeC信号，当连通不成功，则输入信号是HDMI信号，同时TypeC协议芯片3根据CC引脚的接地的状态去判断输入信号的正反插状态；
S2、当TypeC协议芯片3判断输入信号是TypeC信号、且TypeC信号为正插状态时，切换芯片4不切换TypeC信号的正反状态；当TypeC协议芯片3判断输入信号是TypeC信号、且TypeC信号为反插状态时，TypeC协议芯片3控制切换芯片4将TypeC信号切换为正插状态；当TypeC协议芯片3判断输入信号是HDMI信号、且HDMI信号为正插状态时，切换芯片4不切换HDMI信号的正反状态；当TypeC协议芯片3判断输入信号是HDMI信号、且HDMI信 号为反插状态时，TypeC协议芯片3控制切换芯片4将HDMI信号切换为正插状态；
S3、接着，当输入信号是TypeC信号时，TypeC协议芯片3控制DP开关5将正插状态的TypeC信号接到显示器主控芯片8的DP接收端6；当输入信号是HDMI信号时，TypeC协议芯片3控制DP开关5将正插状态的HDMI信号接到显示器主控芯片8的HDMI接收端7；
S31、当输入信号是HDMI信号时，执行完S3的步骤后，TypeC协议芯片3反控制选择开关2，使TypeC接口1的CC引脚与显示器主控芯片8的热插拔检测端连通；
S4、显示器主控芯片8将接收到的TypeC信号或HDMI信号处理后输出到处理器。
该方法使得TypeC接口能够兼容HDMI输入源，无论输入的是TypeC信号还是HDMI信号都能够使用，而且还使得用该方法的显示设备无需设置HDMI接口，能够做得更小，更加便于携带。
以上，仅用以说明本发明的技术方案而非限制，本领域普通技术人员对本发明的技术方案所做的其它修改或者等同替换，只要不脱离本发明技术方案的精神和范围，均应涵盖在本发明的权利要求范围当中。

Claims (6)

  1. 一种免HDMI接口的显示设备，其特征在于，包括：TypeC接口(1)；TypeC协议芯片(3)；切换芯片(4)；DP开关(5)；以及，设有DP接收端(6)和HDMI接收端(7)的显示器主控芯片(8)；
    所述TypeC接口(1)通过所述切换芯片(4)及所述DP开关(5)连接到所述显示器主控芯片(8)的DP接收端(6)和HDMI接收端(7)；
    所述TypeC接口(1)的CC引脚与所述TypeC协议芯片(3)相连，用于所述TypeC协议芯片(3)判断传输信号是HDMI信号还是TypeC信号，以及判断所述传输信号的正反插状态；
    所述TypeC协议芯片(3)还用于控制所述切换芯片(4)将所述传输信号切换为正插状态；
    所述TypeC协议芯片(3)还用于控制所述DP开关(5)将正插状态的所述TypeC信号接到所述DP接收端(6)，将正插状态的所述HDMI信号接到所述HDMI接收端(7)。
  2. 根据权利要求1所述的免HDMI接口的显示设备，其特征在于，所述免HDMI接口的显示设备还包括选择开关(2)；所述TypeC接口(1)的所述CC引脚通过所述选择开关(2)分别与所述TypeC协议芯片(3)及所述显示器主控芯片(8)的热插拔检测端相连；所述TypeC接口(1)通过所述选择开关(2)将TypeC协议信号和热插拔信号复用于所述CC引脚；初始状态时，所述选择开关(2)与TypeC协议芯片(3)连通。
  3. 根据权利要求1所述的免HDMI接口的显示设备，其特征在于，所述显示器主控芯片(8)的型号为RTD2795UT。
  4. 根据权利要求1所述的免HDMI接口的显示设备，其特征在于，所述切换芯片(4)的型号为TI460。
  5. 一种Type接口兼容HDMI的方法，其特征在于，包括以下步骤：
    S1、初始状态时，TypeC协议芯片(3)通过选择开关与TypeC接口(1)连通，TypeC协议芯片(3)通过TypeC接口(1)的CC引脚与插入设备连通，判断输入信号是HDMI信号还是TypeC信号，同时判断所述传输信号的正反插状态；当连通成功，则输入信号是TypeC信号，当连通不成功，则输入信号是HDMI信号，同时TypeC协议芯片(3)根据CC引脚的接地的状态去判断输入信号的正反插状态；
    S2、当TypeC协议芯片(3)判断输入信号是TypeC信号、且TypeC信号为正插状态时，切换芯片(4)不切换TypeC信号的正反状态；
    当TypeC协议芯片(3)判断输入信号是TypeC信号、且TypeC信号为反插状态时，TypeC协议芯片(3)控制切换芯片(4)将TypeC信号切换为正插状态；
    当TypeC协议芯片(3)判断输入信号是HDMI信号、且HDMI信号为正插状态时，切换芯片(4)不切换HDMI信号的正反状态；
    当TypeC协议芯片(3)判断输入信号是HDMI信号、且HDMI信号为反插状态时，TypeC协议芯片(3)控制切换芯片(4)将HDMI信号切换为正插状态；
    S3、接着，当输入信号是TypeC信号时，TypeC协议芯片(3)控制DP开关(5)将正插状态的TypeC信号接到显示器主控芯片(8)的DP接收端(6)；当输入信号是HDMI信号时，TypeC协议芯片(3)控制DP开关(5)将正插状态的HDMI信号接到显示器主控芯片(8)的HDMI接收端(7)；
    S4、显示器主控芯片(8)将接收到的TypeC信号或HDMI信号处理后输出到处理器。
  6. 根据权利要求5所述的Type接口兼容HDMI的方法，其特征在于，还包括S31、当输入信号是HDMI信号时，执行完S3的步骤后，TypeC协议芯片(3)反控制选择开关(2)，使TypeC接口(1)的CC引脚与显示器主控芯片(8)的热插拔检测端连通。
PCT/CN2021/122313 2021-01-18 2021-09-30 一种免HDMI接口的显示设备及Type接口兼容HDMI的方法 WO2022151769A1 (zh)

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