Display device and control method thereof

Abstract

The present application provides a display device and a control method thereof, which relate to the field of display technology. The display device can solve the problem of residual images generated when the power is off, and greatly improve the product quality and user experience. The display device includes: a timing control circuit, a power supply circuit, a system control circuit and a display panel; the power supply circuit is electrically connected to the timing control circuit and the system control circuit respectively, and is configured to: provide a first power supply voltage and a second power supply voltage to the timing control circuit, and the first power supply voltage and the second power supply voltage are different in magnitude; in the normal shutdown mode, and under the control of the system control circuit, the output of the first power supply voltage is first turned off, and the output of the second power supply voltage is turned off after a first period of time.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display device and a control method thereof. Background Art

[0002] OLED (Organic Light-Emitting Diode) display screen has the characteristics of self-luminescence, high contrast, thin thickness, wide viewing angle, fast response speed, can be used for curved panels, wide operating temperature range, and simple manufacturing.

[0003] After the OLED display screen has been working at high brightness for a long time, if the power is suddenly cut off, an afterimage will appear on the display screen. If the afterimage stays for a long time, it is easy to cause permanent afterimage (burn-in), which will reduce product quality and affect user experience. Summary of the invention

[0004] Embodiments of the present application provide a display device and a control method thereof, wherein the display device can solve the problem of afterimages generated when power is off, thereby greatly improving product quality and user experience.

[0005] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0006] In one aspect, a display device is provided, comprising: a timing control circuit, a power supply circuit, a system control circuit and a display panel;

[0007] The power supply circuit is electrically connected to the timing control circuit and the system control circuit respectively, and is configured to: provide a first power supply voltage and a second power supply voltage to the timing control circuit, wherein the first power supply voltage and the second power supply voltage have different magnitudes; in a normal shutdown mode, and under the control of the system control circuit, first turn off the output of the first power supply voltage, and then turn off the output of the second power supply voltage after a first period of time;

[0008] The timing control circuit is also electrically connected to the display panel and is configured to: in a normal shutdown mode and before the power circuit shuts down the output of the first power voltage and the second power voltage in a time-sharing manner, perform a shutdown compensation operation so that the display panel displays a black screen; after the power circuit shuts down the output of the first power voltage and before the power circuit shuts down the output of the second power voltage, stop outputting the panel power voltage to the display panel;

[0009] The system control circuit is also electrically connected to the timing control circuit and is configured to: determine whether the display device is in a normal shutdown mode; if so, control the timing control circuit to perform shutdown compensation; after the shutdown compensation is completed, control the power supply circuit to time-share shut down the output of the first power supply voltage and the second power supply voltage.

[0010] Optionally, the display device further comprises a control signal line, wherein the control signal line is electrically connected to the system control circuit and the power supply circuit respectively;

[0011] The power supply circuit is also configured to: in a normal shutdown mode, and under the control of a control signal transmitted by the system control circuit through the control signal line, first shut down the output of the first power supply voltage, and then shut down the output of the second power supply voltage after a first period of time.

[0012] Optionally, the timing control circuit is further configured to: in normal shutdown mode, and before the power supply circuit shuts down the output of the first power supply voltage and the second power supply voltage in a time-sharing manner, output a black screen image data signal to the display panel so that the display panel displays a black screen.

[0013] Optionally, the timing control circuit is further configured to: after executing the shutdown compensation operation, determine whether the shutdown compensation is completed; if so, feed back a shutdown compensation completion signal to the system control circuit;

[0014] The system control circuit is further configured to: obtain and control the power supply circuit to time-share shut down the output of the first power supply voltage and the second power supply voltage according to the shutdown compensation completion signal after the shutdown compensation is completed.

[0015] Optionally, the display device further comprises: a shutdown compensation line;

[0016] The timing control circuit is further configured to feed back the shutdown compensation completion signal to the system control circuit via the shutdown compensation line.

[0017] Optionally, the system control circuit is further configured to: determine whether a shutdown instruction is received; if so, determine that the display device is in a normal shutdown mode.

[0018] Optionally, the display device further comprises: a shutdown compensation line;

[0019] The system control circuit is further configured to: transmit a shutdown compensation signal to the timing control circuit through the shutdown compensation line, and control the timing control circuit to perform shutdown compensation.

[0020] Optionally, the display device further comprises a control signal line, wherein the control signal line is electrically connected to the system control circuit and the power supply circuit respectively;

[0021] The system control circuit is further configured to: after the shutdown compensation is completed, transmit a control signal to the power supply circuit through the control signal line to control the power supply circuit to shut down the output of the first power supply voltage and the second power supply voltage in a time-sharing manner.

[0022] Optionally, the timing control circuit is further configured to: determine whether the display device is in an abnormal shutdown mode; if so, stop outputting a panel power supply voltage to the display panel;

[0023] The power supply circuit is also configured to: determine whether the display device is in an abnormal shutdown mode; if so, according to a preset program, first turn off the output of the first power supply voltage, and then turn off the output of the second power supply voltage after a second period of time.

[0024] Optionally, the display device further comprises an abnormal power-off line and a control signal line, the abnormal power-off line is electrically connected to the system control circuit and the timing control circuit respectively, and the control signal line is electrically connected to the system control circuit and the power supply circuit respectively;

[0025] The timing control circuit is further configured to: determine whether the display device is in an abnormal shutdown mode according to an abnormal power-off signal transmitted by the abnormal power-off line;

[0026] The power supply circuit is further configured to: determine whether the display device is in an abnormal shutdown mode according to the control signal transmitted by the control signal line;

[0027] The system control circuit is further configured to: in an abnormal shutdown mode, stop transmitting signals to the abnormal power-off line and the control signal line.

[0028] Optionally, the timing control circuit includes a timing control board, the power supply circuit includes a power supply board, and the system control circuit includes a main board.

[0029] Optionally, the system control circuit is further configured to: determine whether a power-on instruction is received; if so, control the power supply circuit to start outputting the first power supply voltage and the second power supply voltage;

[0030] The power supply circuit is further configured to: under the control of the system control circuit, start outputting the first power supply voltage and the second power supply voltage.

[0031] Optionally, the display device further comprises a control signal line, wherein the control signal line is electrically connected to the system control circuit and the power supply circuit respectively;

[0032] The system control circuit is further configured to: transmit a control signal to the power supply circuit through the control signal line to control the power supply circuit to start outputting the first power supply voltage and the second power supply voltage;

[0033] The power supply circuit is further configured to: under the control of the control signal output by the system control circuit, start outputting the first power supply voltage and the second power supply voltage.

[0034] Optionally, the display device further includes: a first power line and a second power line, the first power line being electrically connected to the power circuit and the timing control circuit respectively, and the second power line being electrically connected to the power circuit and the timing control circuit respectively;

[0035] The power supply circuit is further configured to: provide the first power supply voltage to the timing control circuit through the first power supply line; and provide the second power supply voltage to the timing control circuit through the second power supply line.

[0036] Optionally, the first power supply voltage is greater than the second power supply voltage.

[0037] On the other hand, a control method of the above display device is provided, wherein the display device comprises: a timing control circuit, a power supply circuit, a system control circuit and a display panel; wherein the control method comprises:

[0038] The system control circuit determines whether the display device is in a normal shutdown mode, and if so, controls the timing control circuit to perform shutdown compensation;

[0039] The timing control circuit performs a shutdown compensation operation in a normal shutdown mode, so that the display panel displays a black screen;

[0040] After the shutdown compensation is completed, the system control circuit controls the power supply circuit to shut down the output of the first power supply voltage and the second power supply voltage in a time-sharing manner;

[0041] The power supply circuit is in a normal shutdown mode and under the control of the system control circuit, first shuts down the output of the first power supply voltage, and then shuts down the output of the second power supply voltage after a first period of time;

[0042] The timing control circuit stops outputting the panel power supply voltage to the display panel after the power supply circuit turns off outputting the first power supply voltage and before the power supply circuit turns off outputting the second power supply voltage.

[0043] Optionally, the system control circuit determines whether the display device is in a normal shutdown mode, including:

[0044] The system control circuit determines whether a shutdown instruction is received;

[0045] If so, it is determined that the display device is in a normal shutdown mode.

[0046] Optionally, the timing control circuit performs a shutdown compensation operation in a normal shutdown mode so that the display panel displays a black screen, including:

[0047] The timing control circuit outputs a black screen image data signal to the display panel in a normal shutdown mode, so that the display panel displays a black screen.

[0048] Optionally, after the timing control circuit performs a shutdown compensation operation in a normal shutdown mode so that the display panel displays a black screen and before the system control circuit controls the power supply circuit to time-share shut down the output of the first power supply voltage and the second power supply voltage after the shutdown compensation is completed, the method further includes:

[0049] The timing control circuit determines whether the shutdown compensation is completed;

[0050] If yes, feeding back a shutdown compensation completion signal to the system control circuit;

[0051] After the shutdown compensation is completed, the system control circuit controls the power supply circuit to shut down the output of the first power supply voltage and the second power supply voltage in a time-sharing manner, including:

[0052] The system control circuit obtains and controls the power supply circuit to time-share shut down the output of the first power supply voltage and the second power supply voltage according to the shutdown compensation completion signal after the shutdown compensation is completed.

[0053] Optionally, the method further includes:

[0054] The timing control circuit determines whether the display device is in an abnormal shutdown mode, and if so, stops outputting a panel power supply voltage to the display panel;

[0055] The power supply circuit determines whether the display device is in an abnormal shutdown mode. If so, according to a preset program, the output of the first power supply voltage is first turned off, and then the output of the second power supply voltage is turned off after a second period of time.

[0056] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0058] Figure 1 A schematic diagram of the structure of a display device is shown schematically;

[0059] Figure 2 A startup timing diagram of a display device is schematically shown;

[0060] Figure 3 A shutdown timing diagram of a display device is schematically shown;

[0061] Figure 4 A shutdown timing diagram of a display device in a normal shutdown mode is schematically shown;

[0062] Figure 5 A schematic flow chart of a control method for a display device in a normal shutdown mode is shown;

[0063] Figure 6 A shutdown timing diagram of a display device in an abnormal shutdown mode is schematically shown. DETAILED DESCRIPTION

[0064] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0065] In the embodiments of the present application, words such as "first" and "second" are used to distinguish between identical or similar items with basically the same functions and effects. This is only for the purpose of clearly describing the technical solutions of the embodiments of the present application, and shall not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0066] The embodiment of the present application provides a display device, referring to Figure 1 As shown, it includes: a timing control circuit 1, a power supply circuit 2, a system control circuit 3 and a display panel 4.

[0067] refer to Figure 1As shown, the power supply circuit 2 is electrically connected to the timing control circuit 1 and the system control circuit 3, respectively, and is configured to: provide a first power supply voltage and a second power supply voltage to the timing control circuit, the first power supply voltage and the second power supply voltage are different in magnitude; in the normal shutdown mode, and under the control of the system control circuit, first turn off the output of the first power supply voltage, and then turn off the output of the second power supply voltage after a first period of time.

[0068] The specific structure of the power supply circuit is not limited. In order to provide multiple power supply voltages to the timing control circuit, refer to Figure 1 As shown, the power supply circuit 2 may include a first power supply terminal B2 and a second power supply terminal B3, the timing control circuit 1 may include a first power input interface D1 and a second power input interface D2, the first power supply terminal B2 is electrically connected to the first power input interface D1, and the second power supply terminal B3 is electrically connected to the second power input interface D2, and the above-mentioned display device may also include a first power line 11 and a second power line 12, the two ends of the first power line 11 are electrically connected to the first power supply terminal B2 and the first power input interface D1 respectively, and the two ends of the second power line 12 are electrically connected to the second power supply terminal B3 and the second power input interface D2 respectively. The above-mentioned first power supply voltage may be greater than the second power supply voltage, or the first power supply voltage may be less than the second power supply voltage, which is not limited here. For the convenience of design and control, the first power supply voltage may be selected to be greater than the second power supply voltage. For example, the first power supply voltage is 24v and the second power supply voltage is 12v. It should be noted that the number of the first power supply terminal and the second power supply terminal included in the power supply circuit is not limited. In order to improve the flexibility of application, the power supply circuit may include multiple first power supply terminals and multiple second power supply terminals. Figure 1 The power supply circuit 2 includes two first power supply terminals B2 and four second power supply terminals B3 as an example for illustration.

[0069] The above-mentioned power supply circuit is not limited in the way in which the output of the second power supply voltage is turned off after the first period of time. For example, in the power supply circuit, a storage unit such as a capacitor can be set in the circuit that generates the second power supply voltage; after obtaining the control signal of the system control circuit, the output of the first power supply voltage is first turned off. Due to the discharge effect of the storage unit such as the capacitor, the output of the second power supply voltage can be maintained for a period of time until the discharge of the storage unit such as the capacitor is completed, thereby realizing the delayed shutdown of the second power supply voltage. The specific duration of the above-mentioned first period of time is not limited and can be determined according to actual requirements. For example, the duration of the first period of time can be 50ms.

[0070] Of course, the power supply circuit can also be configured to provide a system power supply voltage to the system control circuit. The number and size of the system power supply voltage provided by the power supply circuit to the system control circuit are not limited here. For example, the system power supply voltage may include 5V, 24V, etc. The power supply circuit can provide 5V and 24V voltages to the system control circuit at the same time. Figure 1 As shown, the power supply circuit 2 may further include a mainboard power supply terminal B1, the system control circuit 3 may further include a power input interface A3, and the display device may further include a mainboard power line 13, the two ends of the mainboard power line 13 are electrically connected to the mainboard power supply terminal B1 and the power input interface A3 respectively, and the power supply circuit 2 provides the system power supply voltage to the system control circuit 3 through the mainboard power line 13.

[0071] The above-mentioned normal shutdown mode includes the user normally turning off the shutdown unit such as the shutdown button of the display device to shut down the display device; of course, the display device can also include an abnormal shutdown mode, and the abnormal shutdown mode includes shutting down the display device due to non-subjective factors such as accidental power outages.

[0072] refer to Figure 1 As shown, the timing control circuit 1 is also electrically connected to the display panel 4, and is configured to: in the normal shutdown mode, and before the power supply circuit shuts down the output of the first power supply voltage and the second power supply voltage in a time-sharing manner, perform a shutdown compensation operation so that the display panel displays a black screen; after the power supply circuit shuts down the output of the first power supply voltage and before the power supply circuit shuts down the output of the second power supply voltage, stop outputting the panel power supply voltage to the display panel.

[0073] The specific method of the shutdown compensation operation is not limited here, as long as the display panel can display a black screen. For example, the display panel can display a black screen by inputting a black screen image data signal to the sub-pixels of the display panel; the black screen image data signal here can be an image data signal that displays a grayscale of zero. Alternatively, the sub-pixels of the display panel can be controlled to discharge so that the display panel displays a black screen. The specific discharge method is not limited here and needs to be determined based on the specific structure. Reference Figure 1 As shown, the timing control circuit 1 may further include a data control terminal D6, the display panel 4 includes a data input terminal C2, and the display device may further include a display panel data control line 19, wherein both ends of the display panel data control line 19 are electrically connected to the data control terminal D6 and the data input terminal C2 respectively, and the timing control circuit 1 may input an image data signal to the display panel 4 through the display panel data control line 19.

[0074] In addition, the timing control circuit is also configured to: provide a panel power supply voltage to the display panel; there is no limitation on the size of the panel power supply voltage provided to the display panel. For example, the panel power supply voltage may be the same as the first power supply voltage; or, the panel power supply voltage may be the same as the second power supply voltage; or, the panel power supply voltage is different from the first power supply voltage and the second power supply voltage. If the panel power supply voltage is different from the first power supply voltage and the second power supply voltage, in order to provide a suitable voltage to the display panel, a voltage conversion circuit needs to be provided in the timing control circuit to convert the first power supply voltage or the second power supply voltage into the panel power supply voltage. In order to minimize changes to the circuit structure and reduce the difficulty of design, the panel power supply voltage may be selected to be the same as the first power supply voltage; for example, the panel power supply voltage and the first power supply voltage are both 24V. Reference Figure 1 As shown, the timing control circuit 1 may further include a power control terminal D7, the display panel 4 includes a power input terminal C1, and the display device may further include a display panel power control line 18, the two ends of the display panel power control line 18 are electrically connected to the power control terminal D7 and the power input terminal C1 respectively, and the timing control circuit 1 can input the panel power voltage ELVDD to the display panel 4 through the display panel power control line 18.

[0075] The above-mentioned display panel can be an OLED (Organic Light-Emitting Diode) display panel, or a QLED (Quantum Dot Light Emitting Diodes) display panel, which is not limited here.

[0076] refer to Figure 1 As shown, the system control circuit 3 is also electrically connected to the timing control circuit 1, and is configured to: determine whether the display device is in a normal shutdown mode; if so, control the timing control circuit to perform shutdown compensation; after the shutdown compensation is completed, control the power supply circuit to time-share shut down the output of the first power supply voltage and the second power supply voltage.

[0077] Here, the specific method for the system control circuit to determine whether the display device is in the normal shutdown mode is not limited. In order to better control the timing control circuit, refer to Figure 1 As shown, the system control circuit 1 may include a shutdown compensation control terminal A2, the timing control circuit 1 may include a shutdown compensation terminal D3, and the display device may further include a shutdown compensation line 15, and the two ends of the shutdown compensation line 15 are electrically connected to the shutdown compensation control terminal A2 and the shutdown compensation terminal D3 respectively. The system control circuit 3 can transmit a shutdown compensation signal to the timing control circuit 1 through the shutdown compensation line 15 to control the timing control circuit 1 to perform shutdown compensation.

[0078] In order to better control the power circuit, refer to Figure 1 As shown, the system control circuit 3 may include a control signal terminal A4, the power supply circuit 2 may include a control input terminal B4, and the display device may further include a control signal line 14, and the two ends of the control signal line 14 are electrically connected to the control signal terminal A4 and the control input terminal B4 respectively. The system control circuit 3 can transmit a control signal to the power supply circuit 2 through the control signal line 14, and control the power supply circuit 2 to turn off the output of the first power supply voltage and the second power supply voltage in a time-sharing manner.

[0079] refer to Figure 1 As shown, in order to facilitate the system control circuit to transmit the image video data signal to the timing control circuit, the display device may further include a data line 17, the two ends of which are electrically connected to the port A1 of the system control circuit 3 and the port D5 of the timing control circuit 1 respectively; the type of the data line is not limited, for example, the data line may be a V-By-One line, and data is transmitted by adopting the V-By-One transmission protocol. V-By-One is a signal standard specially developed for high-definition digital image signal transmission, and is widely used in the display field.

[0080] The display device provided by the embodiment of the present application, in the normal shutdown mode, performs shutdown compensation on the display panel through the timing control circuit, so that the display panel displays a black screen before power failure. In this way, the screen seen by the user when shutting down is a black screen. After the black screen is displayed, even if there is still residual charge, the display panel also displays a black screen, thereby avoiding the problem of residual image generated when the power is off, and improving the user experience. Then, under the control of the system control circuit, the power supply circuit first turns off the output of the first power supply voltage, and then turns off the output of the second power supply voltage after the first period; in this way, the timing control circuit can obtain the second power supply voltage to extend the work when the first power supply voltage is lost. Then, in the case of only relying on the second power supply voltage, the timing control circuit can first turn off the output of the panel power supply voltage, thereby ensuring that the display panel is powered off before the timing control circuit; in this way, it can be avoided that when the timing control circuit is powered off before the display panel, the display panel is difficult to maintain the display of the black screen and the problem of residual image occurs, further ensuring that the display device eliminates the power-off residual image, and improving product quality and user experience.

[0081] The above-mentioned display device may be an OLED or QLED display device, or may be any product or component with a display function, such as a television, a digital camera, a mobile phone, a tablet computer, etc., which includes the OLED or QLED display device.

[0082] Optionally, in order to reduce the complexity of the structure and reduce the difficulty and cost of implementation, refer to Figure 1 As shown, the display device further includes a control signal line 14, and the control signal line 14 is electrically connected to the system control circuit 3 and the power supply circuit 2 respectively.

[0083] The power supply circuit is also configured to: in normal shutdown mode, and under the control of a control signal transmitted by the system control circuit through a control signal line, first shut down the output of the first power supply voltage, and then shut down the output of the second power supply voltage after a first period of time.

[0084] The type and size of the control signal transmitted by the control signal line are not limited here. For example, the control signal may include a low-level voltage signal, or the control signal may include a high-level voltage signal.

[0085] Optionally, in order to reduce the driving difficulty and facilitate implementation, the timing control circuit is also configured to: in normal shutdown mode, and before the power supply circuit shuts down the output of the first power supply voltage and the second power supply voltage in a time-sharing manner, output a black screen image data signal to the display panel so that the display panel displays a black screen.

[0086] Here, the timing control circuit outputs a black screen image data signal to the display panel. For example, the timing control circuit can output an image data signal with a grayscale of zero to the display panel. The method for the display panel to display a black screen according to the black screen image data signal is not described in detail here, and those skilled in the art can obtain it from relevant technologies.

[0087] Optionally, in order to reduce the driving time and improve the product response speed, the timing control circuit is also configured to: after executing the shutdown compensation operation, determine whether the shutdown compensation is completed; if so, feedback the shutdown compensation completion signal to the system control circuit.

[0088] Here, the method for the timing control circuit to determine whether the shutdown compensation is completed is not limited. For example, the shutdown compensation time can be preset, and the timing control circuit determines whether the actual compensation time reaches the preset shutdown compensation time. If so, the shutdown compensation is determined to be completed. Of course, other determination methods can also be used, which are not listed here.

[0089] The system control circuit is further configured to: obtain and control the power supply circuit to time-share shut down the output of the first power supply voltage and the second power supply voltage according to the shutdown compensation completion signal after the shutdown compensation is completed.

[0090] Here, the system control circuit can control the power supply circuit to shut down the output of the first power supply voltage and the second power supply voltage in a time-sharing manner through the control signal transmitted by the control signal line.

[0091] Further optionally, in order to reduce the complexity of the structure, thereby reducing the difficulty and cost of implementation, refer to Figure 1 As shown, the display device further includes: a shutdown compensation line 15 .

[0092] The timing control circuit is further configured to feed back a shutdown compensation completion signal to the system control circuit via a shutdown compensation line.

[0093] The type and size of the shutdown compensation completion signal transmitted by the shutdown compensation line are not limited here. For example, the shutdown compensation completion signal may include a low-level voltage signal, or the shutdown compensation completion signal may include a high-level voltage signal. In addition, the shutdown compensation line may use the I2C protocol to transmit the shutdown compensation completion signal. Of course, other protocols may also be used, which are not limited here.

[0094] Optionally, in order to facilitate the determination of whether the display device is in a normal shutdown mode, the system control circuit is further configured to: determine whether a shutdown instruction is received; if so, determine that the display device is in a normal shutdown mode.

[0095] There is no limitation on the specific method of generating the shutdown command. For example, it can be generated by the user pressing a physical shutdown button, or by the user pressing a shutdown button on a virtual interface, or by a remote control, voice, face recognition, gesture recognition, etc.

[0096] Optionally, in order to reduce the complexity of the structure and reduce the difficulty and cost of implementation, refer to Figure 1 As shown, the display device further includes: a shutdown compensation line 15 .

[0097] The system control circuit is further configured to: transmit a shutdown compensation signal to the timing control circuit through the shutdown compensation line, and control the timing control circuit to perform shutdown compensation.

[0098] There is no limitation on the type and size of the shutdown compensation signal here. For example, the shutdown compensation signal may include a low-level voltage signal, in which case the shutdown compensation completion signal may include a high-level voltage signal; or, the shutdown compensation signal may include a high-level voltage signal, in which case the shutdown compensation completion signal may include a low-level voltage signal.

[0099] It should be noted that the system control circuit and the timing control circuit can communicate bidirectionally through the shutdown compensation line. On the one hand, the system control circuit can transmit a shutdown compensation signal to the timing control circuit through the shutdown compensation line. On the other hand, the timing control circuit can transmit a shutdown compensation completion signal to the system control circuit through the shutdown compensation line, thereby effectively improving utilization and saving costs.

[0100] Optionally, in order to reduce the complexity of the structure and reduce the difficulty and cost of implementation, refer to Figure 1 As shown, the display device further includes a control signal line 14, and the control signal line 14 is electrically connected to the system control circuit 3 and the power supply circuit 2 respectively.

[0101] The system control circuit is further configured to: after the shutdown compensation is completed, transmit a control signal to the power supply circuit through the control signal line to control the power supply circuit to time-share shut down the output of the first power supply voltage and the second power supply voltage.

[0102] The type and size of the control signal transmitted by the control signal line are not limited here. For example, the control signal may include a low-level voltage signal, or the control signal may include a high-level voltage signal.

[0103] Optionally, the timing control circuit is further configured to: determine whether the display device is in an abnormal shutdown mode; if so, stop outputting the panel power supply voltage to the display panel.

[0104] The power supply circuit is also configured to: determine whether the display device is in an abnormal shutdown mode; if so, according to a preset program, first turn off the output of the first power supply voltage, and then turn off the output of the second power supply voltage after a second period of time.

[0105] The second time period and the first time period may be the same in length, or may be different in length, depending on the actual situation. For example, the second time period may be 2000 ms in length, and the first time period may be 50 ms in length.

[0106] In this way, when the display device is in an abnormal shutdown mode (for example, an unexpected power failure, etc.), the power circuit first turns off the output of the first power voltage according to a preset program, and then turns off the output of the second power voltage after a second period of time, so that the timing control circuit can obtain the second power voltage to extend the operation when the first power voltage is lost. Then, when only the second power voltage is used for power supply, the timing control circuit can control the output of the panel power voltage to turn off, so that the display panel is quickly powered off, thereby avoiding the problem of residual charge inside the sub-pixels of the display panel and the occurrence of afterimages due to the untimely power-off of the display panel when the timing control circuit is powered off before the display panel.

[0107] Optional, reference Figure 1 As shown, the display device further includes an abnormal power-off line 16 and a control signal line 14. The abnormal power-off line 16 is electrically connected to the terminal A5 of the system control circuit 3 and the terminal D4 of the timing control circuit 1 respectively. The control signal line 14 is electrically connected to the system control circuit 3 and the power supply circuit 2 respectively.

[0108] The timing control circuit is further configured to determine whether the display device is in an abnormal shutdown mode according to an abnormal power-off signal transmitted by the abnormal power-off line.

[0109] The power supply circuit is further configured to determine whether the display device is in an abnormal shutdown mode according to a control signal transmitted by the control signal line.

[0110] The system control circuit is further configured to: in the abnormal shutdown mode, stop transmitting signals to the abnormal power-off line and the control signal line.

[0111] Here, there is no limitation on the method by which the timing control circuit determines whether the display device is in the abnormal shutdown mode according to the abnormal power-off signal transmitted by the abnormal power-off line. For example, in the normal working mode, the system control circuit transmits a high-level signal to the abnormal power-off line; in the abnormal shutdown mode, the system control circuit is powered off and stops transmitting signals to the abnormal power-off line, then the level of the abnormal power-off signal transmitted by the abnormal power-off line will flip, that is, flip from a high-level signal to a low-level signal, and the timing control circuit can determine whether the display device is in the abnormal shutdown mode by determining whether the level of the abnormal power-off signal is flipped. Specifically, if the level of the abnormal power-off signal is flipped, it is determined that the display device is in the abnormal shutdown mode; if the level of the abnormal power-off signal is not flipped, it is determined that the display device is in the non-abnormal shutdown mode.

[0112] Here, there is no limitation on the method by which the power supply circuit determines whether the display device is in an abnormal shutdown mode based on the control signal transmitted by the control signal line. For example, in the normal working mode, the system control circuit can transmit a control signal with a high level to the control signal line; in the normal shutdown mode, the system control circuit can transmit a control signal with a low level to the control signal line; in the abnormal shutdown mode, the system control circuit loses power and stops transmitting signals to the control signal line, then the control signal line can still output a control signal with a certain level for a short period of time, and then no longer outputs a signal. The power supply circuit can determine whether the display device is in an abnormal shutdown mode by determining whether the control signal can be continuously obtained. Specifically, if the power supply circuit cannot continuously obtain the control signal, it is determined that the display device is in an abnormal shutdown mode; if the power supply circuit can continuously obtain the control signal, it is determined that the display device is in a non-abnormal shutdown mode.

[0113] Optionally, for ease of control, the timing control circuit includes a timing control board (also called a TCON board), the power supply circuit includes a power supply board, and the system control circuit includes a main board.

[0114] Optionally, the system control circuit is further configured to: determine whether a power-on instruction is received; if so, control the power supply circuit to start outputting the first power supply voltage and the second power supply voltage.

[0115] The power supply circuit is further configured to: under the control of the system control circuit, start outputting the first power supply voltage and the second power supply voltage.

[0116] The specific method of generating the above-mentioned power-on command is not limited. For example, it can be generated by the user pressing the physical power-on button of the display device, or by a remote control, or by inserting an HDMI (High Definition Multimedia Interface) video image data cable.

[0117] The order of turning on the first power supply voltage and the second power supply voltage is not limited; for example, the first power supply voltage and the second power supply voltage can be turned on at the same time; or, the first power supply voltage is turned on first, and then the second power supply voltage is turned on; or, the second power supply voltage is turned on first, and then the first power supply voltage is turned on. In order to save time and increase the startup response speed, the first power supply voltage and the second power supply voltage can be turned on at the same time.

[0118] Taking the first power supply voltage as 24V and the second power supply voltage as 12V as an example, Figure 2 The power-on timing diagram shown in the figure illustrates the power-on control method of the display device. Figure 2 As shown, after the display device is plugged into the socket, the AC INPUT signal (alternating current signal) is turned on; after less than or equal to 3s, the standby power line starts to transmit the standby power signal (5vSTB signal), so that the system control circuit is in standby state; then, after the system control circuit receives the power-on command, the system control circuit transmits the control signal (PS_ON signal) to the power circuit through the control signal line; then, under the control of the control signal, the power circuit first outputs a 5v power supply voltage, and then outputs 12v and 24v power supply voltages at the same time; wherein, within 250ms after the standby power signal (PS_ON signal) is turned on, the 12v and 24v power supply voltages are output.

[0119] It should be noted that the above-mentioned standby power line is electrically connected to the system control circuit and the power circuit respectively, and is configured to provide standby power to the system control circuit. The standby power line is in a normal power supply state and stops supplying power when the socket is unplugged or the power is accidentally cut off.

[0120] Optionally, in order to reduce the complexity of the structure and reduce the difficulty and cost of implementation, refer to Figure 1 As shown, the display device further includes a control signal line 14, and the control signal line 14 is electrically connected to the system control circuit 3 and the power supply circuit 2 respectively.

[0121] The system control circuit is further configured to: transmit a control signal to the power supply circuit through the control signal line to control the power supply circuit to start outputting the first power supply voltage and the second power supply voltage.

[0122] The power supply circuit is further configured to: under the control of a control signal output by the system control circuit, start outputting the first power supply voltage and the second power supply voltage.

[0123] There is no limitation on the type and size of the control signal transmitted by the control signal line. For example, the control signal may include a low-level voltage signal. Then, in order to facilitate the distinction of control, in the normal shutdown mode, the control signal transmitted by the control signal line may include a high-level voltage signal; alternatively, the control signal may include a high-level voltage signal. In the normal shutdown mode, the control signal transmitted by the control signal line may include a low-level voltage signal.

[0124] Optionally, in order to better provide different power supply voltages to the timing control circuit and prevent different power supply voltages from interfering with each other, refer to Figure 1 As shown, the display device further includes: a first power line 11 and a second power line 12, the first power line 11 is electrically connected to the power circuit 2 and the timing control circuit 1 respectively, and the second power line 12 is electrically connected to the power circuit 2 and the timing control circuit 1 respectively.

[0125] The power supply circuit is further configured to: provide a first power supply voltage to the timing control circuit through a first power supply line; and provide a second power supply voltage to the timing control circuit through a second power supply line.

[0126] refer to Figure 1 As shown, the power supply circuit 2 may include a first power supply terminal B2 and a second power supply terminal B3, the timing control circuit 1 may include a first power input interface D1 and a second power input interface D2, the two ends of the first power line 11 are electrically connected to the first power supply terminal B2 and the first power input interface D1, respectively, and the two ends of the second power line 12 are electrically connected to the second power supply terminal B3 and the second power input interface D2, respectively. The number of the first power supply terminal and the second power supply terminal included in the power supply circuit is not limited. In order to provide more options and extend the service life of the terminals, multiple first power supply terminals and multiple second power supply terminals may be provided. Figure 1 In the figure, a power supply circuit including two first power supply terminals B2 and four second power supply terminals B3 is used as an example for illustration. Figure 1 As shown, the power circuit 2 may further include a socket terminal B5 for electrically connecting to a socket to obtain external alternating current. The socket terminal B5 may include a live wire terminal (L) and a neutral wire terminal (N).

[0127] It should be noted that, in order to simplify the structure, the first power line and the second power line are respectively integrated with a ground line (GND line), and no additional ground line is provided.

[0128] The first power supply voltage may be greater than the second power supply voltage, or the first power supply voltage may be less than the second power supply voltage, which is not limited here. For ease of design and control, the first power supply voltage is optionally greater than the second power supply voltage, and for example, the first power supply voltage is 24V and the second power supply voltage is 12V.

[0129] The embodiment of the present application also provides a control method of the display device as described above, referring to Figure 1 As shown, the display device includes: a timing control circuit 1, a power supply circuit 2, a system control circuit 3 and a display panel 4; the control method includes:

[0130] S01. The system control circuit determines whether the display device is in a normal shutdown mode. If so, the system control circuit controls the timing control circuit to perform shutdown compensation.

[0131] S02. The timing control circuit performs a shutdown compensation operation in a normal shutdown mode, so that the display panel displays a black screen.

[0132] S03: After the shutdown compensation is completed, the system control circuit controls the power supply circuit to shut down the output of the first power supply voltage and the second power supply voltage in a time-sharing manner.

[0133] S04. The power circuit is in a normal shutdown mode and under the control of the system control circuit, first turns off the output of the first power voltage, and then turns off the output of the second power voltage after a first period of time.

[0134] S05. The timing control circuit stops outputting the panel power voltage to the display panel after the power circuit turns off outputting the first power voltage and before the power circuit turns off outputting the second power voltage.

[0135] By executing S01-S05, in the normal shutdown mode, the display panel is shut down and compensated by the timing control circuit, so that the display panel displays a black screen before power failure. In this way, the screen seen by the user when shutting down is a black screen. After the black screen is displayed, even if there is still residual charge, the display panel also displays a black screen, thereby avoiding the problem of residual image generated when the power is off and improving the user experience. Then, under the control of the system control circuit, the power supply circuit first turns off the output of the first power supply voltage, and then turns off the output of the second power supply voltage after the first period; in this way, the timing control circuit can obtain the second power supply voltage to extend the work when the first power supply voltage is lost. Then, in the case of only relying on the second power supply voltage, the timing control circuit can first turn off the output of the panel power supply voltage, thereby ensuring that the display panel is powered off before the timing control circuit; in this way, it can be avoided that when the timing control circuit is powered off before the display panel, the display panel is difficult to maintain the display of the black screen and the problem of residual image occurs, further ensuring that the display device eliminates the power-off residual image, and improving product quality and user experience.

[0136] Optionally, in order to facilitate determining whether the display device is in the normal shutdown mode, in the above step S01, the system control circuit determines whether the display device is in the normal shutdown mode including:

[0137] S101: The system control circuit determines whether a shutdown instruction is received.

[0138] There is no limitation on the specific method of generating the shutdown command. For example, it can be generated by the user pressing a physical shutdown button, or by the user pressing a shutdown button on a virtual interface, or by a remote control, voice, face recognition, gesture recognition, etc.

[0139] S102: If yes, determine that the display device is in a normal shutdown mode.

[0140] Optionally, in order to reduce the driving difficulty and facilitate implementation, the above step S02, in which the timing control circuit performs a shutdown compensation operation in a normal shutdown mode so that the display panel displays a black screen, includes:

[0141] S02': In the normal shutdown mode, the timing control circuit outputs a black screen image data signal to the display panel, so that the display panel displays a black screen.

[0142] Here, the timing control circuit outputs a black screen image data signal to the display panel. For example, the timing control circuit can output an image data signal with a grayscale of zero to the display panel. The method for the display panel to display a black screen according to the black screen image data signal is not described in detail here, and those skilled in the art can obtain it from relevant technologies.

[0143] Optionally, in order to reduce the driving time and improve the product response speed, at S02, the timing control circuit performs a shutdown compensation operation in the normal shutdown mode so that the display panel displays a black screen, and at S03, the system control circuit controls the power supply circuit to time-share shut down the output of the first power supply voltage and the second power supply voltage after the shutdown compensation is completed, the above method further includes:

[0144] S06. The timing control circuit determines whether the shutdown compensation is completed.

[0145] Here, the method for the timing control circuit to determine whether the shutdown compensation is completed is not limited. For example, the shutdown compensation time can be preset, and the timing control circuit determines whether the actual compensation time reaches the preset shutdown compensation time. If so, the shutdown compensation is determined to be completed. Of course, other determination methods can also be used, which are not listed here.

[0146] S07: If yes, a shutdown compensation completion signal is fed back to the system control circuit.

[0147] S03, after the shutdown compensation is completed, the system control circuit controls the power supply circuit to time-share shut down the output of the first power supply voltage and the second power supply voltage, including:

[0148] S03', the system control circuit obtains and controls the power supply circuit to time-share shut down the output of the first power supply voltage and the second power supply voltage according to the shutdown compensation completion signal after the shutdown compensation is completed.

[0149] Here, the system control circuit can control the power supply circuit to shut down the output of the first power supply voltage and the second power supply voltage in a time-sharing manner through the control signal transmitted by the control signal line.

[0150] A specific embodiment is provided below to explain in detail the control method of the display device in the normal shutdown mode.

[0151] refer to Figure 5 As shown, the method includes:

[0152] S201: The system control circuit determines whether a shutdown instruction is received.

[0153] S202: If yes, determine that the display device is in normal shutdown mode.

[0154] S203 , the system control circuit transmits a shutdown compensation signal to the timing control circuit through the shutdown compensation line, and controls the timing control circuit to perform shutdown compensation.

[0155] S204 , the timing control circuit performs a shutdown compensation operation in the normal shutdown mode, so that the display panel displays a black screen.

[0156] S205: The timing control circuit determines whether shutdown compensation is completed.

[0157] S206: If yes, a shutdown compensation completion signal is fed back to the system control circuit through the shutdown compensation line.

[0158] S207, the system control circuit obtains and transmits a control signal to the power supply circuit through the control signal line according to the shutdown compensation completion signal after the shutdown compensation is completed, so as to control the power supply circuit to shut down the output of the first power supply voltage and the second power supply voltage in a time-sharing manner.

[0159] S208. The power circuit is in a normal shutdown mode and under the control of the system control circuit, first turns off the output of the first power voltage, and then turns off the output of the second power voltage after a first period of time.

[0160] Taking the first power supply voltage including 24V and the second power supply voltage including 12V as an example, the shutdown control method of the above display device is described. Figure 3As shown, after pressing the shutdown button, the AC INPUT signal (alternating current signal) of the display device is turned off and changes from a high level to a low level; after more than or equal to 10ms, the control signal (PS_ON signal) transmitted from the system control circuit to the power supply circuit, the standby power signal (5vSTB signal) transmitted from the power supply circuit to the system control circuit, the 5v power supply voltage signal transmitted from the power supply circuit to the system control circuit, and the 24v power supply voltage signal transmitted from the power supply circuit to the timing control circuit all change from a high level to a low level; after more than or equal to 50ms, the 12v power supply voltage signal transmitted from the power supply circuit to the timing control circuit changes from a high level to a low level. That is, in the normal shutdown mode, the power supply circuit first turns off the output of the 5v and 24v power supply voltages, and then turns off the output of the 12v power supply voltage after the first period.

[0161] refer to Figure 4 As shown, VDD represents the second power supply voltage signal output by the power supply circuit, TxData represents the image video data signal transmitted by the system control circuit to the timing control circuit, ELVDD represents the panel power supply voltage signal output by the timing control circuit to the display panel (the panel power supply voltage signal is the same as the first power supply voltage signal), ECU Enable represents the shutdown compensation signal output by the system control circuit to the timing control circuit, and ECD represents the shutdown compensation signal transmitted by the timing control circuit to the system control circuit; Figure 4 The T1, T2, T3 and T4 stages are the normal power-on timing stages, and the compensation shutdown stage occurs in the T5, T7 and T8 stages; after receiving the shutdown command, the shutdown compensation signal ECU Enable sent by the system control circuit to the timing control circuit appears an enable signal; then in the T7 stage, the timing control circuit performs the shutdown compensation operation; after the compensation is completed, the shutdown compensation completion signal ECD sent by the timing control circuit to the system control circuit changes from a low level to a high level, and the system control circuit sends a control signal to the power supply circuit to control the power supply circuit to first turn off the output of the first power supply voltage, and then turn off the output of the second power supply voltage signal; in the T8 and T5 stages, since the first power supply voltage is turned off, ELVDD also completes power-off; after T5 ends, VDD starts and completes power-off, thereby completing the shutdown process in the normal shutdown mode. T6 is the preparation stage for entering the next stage. Figure 4 The values ​​of T1-T8 can be referred to in Table 1 below.

[0162] Table 1

[0163]

[0164] In Table 1, ms means milliseconds and sec means seconds. In Table 1, T5+T8 is about 50ms, that is, after the compensation is completed, the power supply circuit turns off the second power supply voltage signal 50ms after turning off the first power supply voltage signal.

[0165] Optionally, the above method further includes:

[0166] S10, the timing control circuit determines whether the display device is in an abnormal shutdown mode, and if so, stops outputting the panel power supply voltage to the display panel.

[0167] S11. The power supply circuit determines whether the display device is in an abnormal shutdown mode. If so, according to a preset program, the output of the first power supply voltage is first turned off, and then the output of the second power supply voltage is turned off after a second period of time.

[0168] In step S11, the power supply circuit can turn off the system power supply voltage provided to the system control circuit while turning off the first power supply voltage. If the first power supply voltage includes 24v, the system power supply voltage includes 5v, and the second power supply voltage includes 12v, then in step S11, the power supply circuit first turns off the 5v and 12v power supply voltages, at which point the system control circuit is powered off; then the 12v is turned off, and the timing control circuit is powered off. In step S10, the timing control circuit stops outputting the panel power supply voltage to the display panel, and the display panel is powered off. At this point, the timing control circuit is not powered off due to the 12v power supply; when the power supply circuit turns off the 12v power supply voltage, the timing control circuit is powered off.

[0169] When an abnormal power failure occurs, the display device can simultaneously execute the above steps S10 and S11; by executing steps S10-S11, when the display device is in an abnormal shutdown mode (for example, an unexpected power failure, etc.), the power circuit first turns off the output of the first power supply voltage according to a preset program, and then turns off the output of the second power supply voltage after a second period of time, so that the timing control circuit can obtain the second power supply voltage to extend the operation when the first power supply voltage is lost. Then, when only the second power supply voltage is used for power supply, the timing control circuit can control the output of the panel power supply voltage to turn off, so that the display panel is quickly powered off, thereby avoiding the problem of residual charge inside the sub-pixels of the display panel and the appearance of afterimages when the timing control circuit is powered off before the display panel, and the display panel is not powered off in time.

[0170] Optional, reference Figure 1 As shown, the display device further includes an abnormal power-off line 16 and a control signal line 14. The abnormal power-off line 16 is electrically connected to the system control circuit 3 and the timing control circuit 1 respectively, and the control signal line 14 is electrically connected to the system control circuit 3 and the power supply circuit 2 respectively.

[0171] In the above step S10, the timing control circuit determines whether the display device is in the abnormal shutdown mode, including:

[0172] According to the abnormal power-off signal transmitted by the abnormal power-off line, it is determined whether the display device is in an abnormal shutdown mode.

[0173] Here, there is no limitation on the method by which the timing control circuit determines whether the display device is in the abnormal shutdown mode according to the abnormal power-off signal transmitted by the abnormal power-off line. For example, in the normal working mode, the system control circuit transmits a high-level signal to the abnormal power-off line; in the abnormal shutdown mode, the system control circuit is powered off and stops transmitting signals to the abnormal power-off line, then the level of the abnormal power-off signal transmitted by the abnormal power-off line will flip, that is, flip from a high-level signal to a low-level signal, and the timing control circuit can determine whether the display device is in the abnormal shutdown mode by determining whether the level of the abnormal power-off signal is flipped. Specifically, if the level of the abnormal power-off signal is flipped, it is determined that the display device is in the abnormal shutdown mode; if the level of the abnormal power-off signal is not flipped, it is determined that the display device is in the non-abnormal shutdown mode.

[0174] In the above step S11, the power circuit determines whether the display device is in the abnormal shutdown mode, including:

[0175] According to the control signal transmitted by the control signal line, it is determined whether the display device is in an abnormal shutdown mode.

[0176] Here, there is no limitation on the method by which the power supply circuit determines whether the display device is in an abnormal shutdown mode based on the control signal transmitted by the control signal line. For example, in the normal working mode, the system control circuit can transmit a control signal with a high level to the control signal line; in the normal shutdown mode, the system control circuit can transmit a control signal with a low level to the control signal line; in the abnormal shutdown mode, the system control circuit loses power and stops transmitting signals to the control signal line, then the control signal line can still output a control signal with a certain level for a short period of time, and then no longer outputs a signal. The power supply circuit can determine whether the display device is in an abnormal shutdown mode by determining whether the control signal can be continuously obtained. Specifically, if the power supply circuit cannot continuously obtain the control signal, it is determined that the display device is in an abnormal shutdown mode; if the power supply circuit can continuously obtain the control signal, it is determined that the display device is in a non-abnormal shutdown mode.

[0177] Reference below Figure 6 As shown, a shutdown control method of a display device in an abnormal shutdown mode is specifically described. Figure 6 In the figure, VDD represents the second power supply voltage signal output by the power supply circuit, TxData represents the image video data signal transmitted by the system control circuit to the timing control circuit, ELVDD represents the panel power supply voltage signal output by the timing control circuit to the display panel (the panel power supply voltage signal is the same as the first power supply voltage signal), and Po-Off Signal represents the abnormal power-off signal transmitted by the system control circuit to the timing control circuit; Figure 6The T1, T2, T3 and T4 stages are the normal power-on timing stages, and the abnormal power-off triggering stage is in the T5 and T6 stages. When an abnormal power failure occurs, the first power supply voltage output by the power supply circuit and the panel power supply voltage will be powered off immediately; the abnormal power-off signal Po-Off Signal appears an enable signal (the signal level is flipped), and the timing control circuit determines to enter the abnormal shutdown mode, and then the panel power supply voltage signal ELVDD is powered off. After T5, the second power supply voltage VDD output by the power supply circuit is powered off, thereby completing the shutdown. Figure 6 In the figure, the power-on stages T1 and T4 are illustrated by taking the stage from 10% voltage value rising to 90% voltage value as the power-on stage as an example, and at the same time, the power-off stage is illustrated by taking the stage from 90% voltage value falling to 10% voltage value as the power-off stage as an example. Figure 6 The values ​​of T1-T6 can be referred to in Table 2 below.

[0178] Table 2

[0179]

[0180] In Table 2, ms means milliseconds and sec means seconds. In Table 2, the range of T5 is 1500-2000ms, so the power circuit can turn off the second power supply voltage signal after turning off the first power supply voltage signal for 2000ms (T5 stage is completed), thereby completing time-sharing power-off.

[0181] The term "one embodiment", "embodiment" or "one or more embodiments" herein means that a particular feature, structure or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present application. In addition, please note that the examples of the term "in one embodiment" here do not necessarily all refer to the same embodiment.

[0182] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0183] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A display device, in, include: Timing control circuit, power supply circuit, system control circuit and display panel; The power supply circuit is electrically connected to the timing control circuit and the system control circuit respectively, and is configured to: provide a first power supply voltage and a second power supply voltage to the timing control circuit, wherein the first power supply voltage and the second power supply voltage have different magnitudes; in a normal shutdown mode, and under the control of the system control circuit, first turn off the output of the first power supply voltage, and then turn off the output of the second power supply voltage after a first period of time; The timing control circuit is also electrically connected to the display panel and is configured to: in a normal shutdown mode and before the power circuit shuts down the output of the first power voltage and the second power voltage in a time-sharing manner, perform a shutdown compensation operation so that the display panel displays a black screen; after the power circuit shuts down the output of the first power voltage and before the power circuit shuts down the output of the second power voltage, stop outputting the panel power voltage to the display panel; The system control circuit is also electrically connected to the timing control circuit, and is configured to: determine whether the display device is in a normal shutdown mode; if so, control the timing control circuit to perform shutdown compensation; after the shutdown compensation is completed, control the power supply circuit to time-share shut down the output of the first power supply voltage and the second power supply voltage, so as to avoid the display panel having difficulty in maintaining the display of the black screen when the timing control circuit is powered off before the display panel.

2. The display device according to claim 1, in, The display device further comprises a control signal line, wherein the control signal line is electrically connected to the system control circuit and the power supply circuit respectively; The power supply circuit is also configured to: in a normal shutdown mode, and under the control of a control signal transmitted by the system control circuit through the control signal line, first shut down the output of the first power supply voltage, and then shut down the output of the second power supply voltage after a first period of time.

3. The display device according to claim 1, in, The timing control circuit is further configured to: in a normal shutdown mode and before the power circuit shuts down the output of the first power supply voltage and the second power supply voltage in a time-sharing manner, output a black screen image data signal to the display panel so that the display panel displays a black screen.

4. The display device according to claim 1, in, The timing control circuit is further configured to: after executing the shutdown compensation operation, determine whether the shutdown compensation is completed; if so, feed back a shutdown compensation completion signal to the system control circuit; The system control circuit is further configured to: obtain and control the power supply circuit to time-share shut down the output of the first power supply voltage and the second power supply voltage according to the shutdown compensation completion signal after the shutdown compensation is completed.

5. The display device according to claim 4, in, The display device further includes: a shutdown compensation line; The timing control circuit is further configured to feed back the shutdown compensation completion signal to the system control circuit via the shutdown compensation line.

6. The display device according to claim 1, in, The system control circuit is further configured to: determine whether a shutdown instruction is received; if so, determine that the display device is in a normal shutdown mode.

7. The display device according to claim 1, in, The display device further includes: a shutdown compensation line; The system control circuit is further configured to: transmit a shutdown compensation signal to the timing control circuit through the shutdown compensation line, and control the timing control circuit to perform shutdown compensation.

8. The display device according to claim 1, in, The display device further comprises a control signal line, wherein the control signal line is electrically connected to the system control circuit and the power supply circuit respectively; The system control circuit is further configured to: after the shutdown compensation is completed, transmit a control signal to the power supply circuit through the control signal line to control the power supply circuit to shut down the output of the first power supply voltage and the second power supply voltage in a time-sharing manner.

9. The display device according to claim 1, in, The timing control circuit is further configured to: determine whether the display device is in an abnormal shutdown mode; if so, stop outputting a panel power supply voltage to the display panel; The power supply circuit is also configured to: determine whether the display device is in an abnormal shutdown mode; if so, according to a preset program, first turn off the output of the first power supply voltage, and then turn off the output of the second power supply voltage after a second period of time.

10. The display device according to claim 9, in, The display device further comprises an abnormal power-off line and a control signal line, wherein the abnormal power-off line is electrically connected to the system control circuit and the timing control circuit respectively, and the control signal line is electrically connected to the system control circuit and the power supply circuit respectively; The timing control circuit is further configured to: determine whether the display device is in an abnormal shutdown mode according to an abnormal power-off signal transmitted by the abnormal power-off line; The power supply circuit is further configured to: determine whether the display device is in an abnormal shutdown mode according to the control signal transmitted by the control signal line; The system control circuit is further configured to: in an abnormal shutdown mode, stop transmitting signals to the abnormal power-off line and the control signal line.

11. The display device according to claim 1, in, The timing control circuit includes a timing control board, the power supply circuit includes a power supply board, and the system control circuit includes a main board.

12. The display device according to claim 1, in, The system control circuit is further configured to: determine whether a power-on instruction is received; if so, control the power supply circuit to start outputting the first power supply voltage and the second power supply voltage; The power supply circuit is further configured to: under the control of the system control circuit, start outputting the first power supply voltage and the second power supply voltage.

13. The display device according to claim 12, in, The display device further comprises a control signal line, wherein the control signal line is electrically connected to the system control circuit and the power supply circuit respectively; The system control circuit is further configured to: transmit a control signal to the power supply circuit through the control signal line to control the power supply circuit to start outputting the first power supply voltage and the second power supply voltage; The power supply circuit is further configured to: under the control of the control signal output by the system control circuit, start outputting the first power supply voltage and the second power supply voltage.

14. The display device according to claim 1, in, The display device further includes: a first power line and a second power line, the first power line being electrically connected to the power circuit and the timing control circuit respectively, and the second power line being electrically connected to the power circuit and the timing control circuit respectively; The power supply circuit is further configured to: provide the first power supply voltage to the timing control circuit through the first power supply line; and provide the second power supply voltage to the timing control circuit through the second power supply line.

15. The display device according to claim 1, in, The first power supply voltage is greater than the second power supply voltage.

16. A method for controlling a display device according to any one of claims 1 to 15, wherein the display device include: A timing control circuit, a power supply circuit, a system control circuit and a display panel; wherein the control method comprises: The system control circuit determines whether the display device is in a normal shutdown mode, and if so, controls the timing control circuit to perform shutdown compensation; The timing control circuit performs a shutdown compensation operation in a normal shutdown mode, so that the display panel displays a black screen; After the shutdown compensation is completed, the system control circuit controls the power supply circuit to shut down the output of the first power supply voltage and the second power supply voltage in a time-sharing manner; The power supply circuit is in a normal shutdown mode and under the control of the system control circuit, first shuts down the output of the first power supply voltage, and then shuts down the output of the second power supply voltage after a first period of time; The timing control circuit stops outputting the panel power supply voltage to the display panel after the power supply circuit turns off outputting the first power supply voltage and before the power supply circuit turns off outputting the second power supply voltage.

17. The method according to claim 16, in, The system control circuit determines whether the display device is in the normal shutdown mode, including: The system control circuit determines whether a shutdown instruction is received; If so, it is determined that the display device is in a normal shutdown mode.

18. The method according to claim 16, in, The timing control circuit performs a shutdown compensation operation in a normal shutdown mode so that the display panel displays a black screen, including: The timing control circuit outputs a black screen image data signal to the display panel in a normal shutdown mode, so that the display panel displays a black screen.

19. The method according to claim 16, in, When the timing control circuit performs a shutdown compensation operation in a normal shutdown mode, so that the display panel displays a black screen, and before the system control circuit controls the power supply circuit to time-share shut down the output of the first power supply voltage and the second power supply voltage after the shutdown compensation is completed, the method further includes: The timing control circuit determines whether the shutdown compensation is completed; If yes, feeding back a shutdown compensation completion signal to the system control circuit; After the shutdown compensation is completed, the system control circuit controls the power supply circuit to shut down the output of the first power supply voltage and the second power supply voltage in a time-sharing manner, including: The system control circuit obtains and controls the power supply circuit to time-share shut down the output of the first power supply voltage and the second power supply voltage according to the shutdown compensation completion signal after the shutdown compensation is completed.

20. The method according to claim 16, in, The method further comprises: The timing control circuit determines whether the display device is in an abnormal shutdown mode, and if so, stops outputting a panel power supply voltage to the display panel; The power supply circuit determines whether the display device is in an abnormal shutdown mode. If so, according to a preset program, the output of the first power supply voltage is first turned off, and then the output of the second power supply voltage is turned off after a second period of time.

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