Display device and its control method, display equipment

Abstract

This application provides a display device and its control method, as well as a display apparatus. The display device includes a system controller and a display module. The display module includes a timing controller, a source driver, a first power supply unit, a second power supply unit, and a display panel. The system controller is connected to the timing controller and is used to output a first mode command to the timing controller, causing the timing controller to enter a first operating mode, whereby the refresh rate of the display module enters a 0Hz mode. Based on the received first mode command, the timing controller sequentially outputs a first control signal to the second power supply unit, a second control signal to the source driver, a third control signal to the source driver, and a fourth control signal to the first power supply unit to perform corresponding control on each unit. Using this application, the frequency of the display module can be reduced to 0Hz to reduce power consumption without causing abnormal screen display.

Description

Technical Field

[0001] This application relates to the field of display technology, and more specifically, to a display device and its control method, and a display equipment. Background Technology

[0002] Compared with liquid crystal displays (LCDs), organic light-emitting diode (OLED) displays have advantages such as being thinner, lighter, having a wider viewing angle, being self-emissive, having continuously adjustable emission colors, being less expensive, having a faster response time, having lower energy consumption, having lower driving voltage, having a wider operating temperature range, having a simpler manufacturing process, and having higher luminous efficiency. Therefore, they are expected to become the next generation of flat panel displays to replace LCDs.

[0003] Because medium-sized OLED displays consume a lot of power, most related technologies use the method of reducing the frequency to reduce power consumption, but this may cause abnormal image phenomena. Summary of the Invention

[0004] This application addresses the shortcomings of existing methods by proposing a display device and its control method, as well as a display equipment, to solve the technical problem that existing technologies may produce abnormal screen display phenomena when using frequency reduction to reduce power consumption.

[0005] In a first aspect, embodiments of this application provide a display device, including: a system controller and a display module; the display module includes: a timing controller, a source driver, a first power supply unit, a second power supply unit, and a display panel;

[0006] The source driver is connected to the display panel and is used to output data signals to the display panel; the first power supply unit is connected to the source driver and the display panel respectively and is used to supply power to the source driver and the GOA circuit of the display panel; the second power supply unit is connected to the display panel and is used to supply power to the pixel circuit of the display panel.

[0007] The system controller is connected to the timing controller and is used to output a first mode command to the timing controller so that the display module enters the first working mode. The first working mode is when the refresh rate of the display module enters the 0 Hz mode.

[0008] The timing controller is connected to the source driver, the first power supply unit, and the second power supply unit respectively. Based on the received first mode command, it sequentially outputs a first control signal to the second power supply unit, a second control signal to the source driver, a third control signal to the source driver, and a fourth control signal to the first power supply unit. The first control signal is used to control the second power supply unit to turn off, the second control signal is used to control the source driver to output a data signal for displaying a black screen to the display panel, the third control signal is used to control the source driver to turn off some functions, and the fourth control signal is used to control the first power supply unit to turn off.

[0009] In one possible implementation, the timing controller is used to output a second control signal to the source driver based on the received first mode command, so as to control the source driver to output data signals that display at least 3 frames of black and white images to the display panel.

[0010] In one possible implementation, the system controller is connected to the timing controller and is used to output a second mode command to the timing controller so that the display module enters a second working mode. The second working mode is when the refresh rate of the display module exits the 0 Hz mode.

[0011] The timing controller is connected to the source driver, the first power supply unit, and the second power supply unit, respectively. Based on the received second mode command, it sequentially outputs a fifth control signal to the source driver, a sixth control signal to the first power supply unit, a seventh control signal to the source driver, and an eighth control signal to the second power supply unit. The fifth control signal is used to control the activation of some functions of the source driver that has been turned off. The sixth control signal is used to control the activation of the first power supply unit. The seventh control signal is used to control the source driver to output data signals for displaying a normal picture to the display panel. The eighth control signal is used to control the activation of the second power supply unit.

[0012] In one possible implementation, the timing controller is used to output a seventh control signal to the source driver based on the received second mode command, so as to control the source driver to output data signals that display at least two frames of normal images to the display panel.

[0013] In one possible implementation, the system controller is connected to the timing controller and is used to output a third mode command to the timing controller so that the display module enters the third working mode. The third working mode is that the refresh frequency of the display module enters the preset refresh frequency mode, and the preset refresh frequency is greater than 0 Hz and less than the current refresh frequency.

[0014] A timing controller is connected to a source driver, a first power supply unit, and a second power supply unit, respectively; both the first power supply unit and the second power supply unit include voltage output circuits.

[0015] The timing controller is used to control the refresh rate of the current display module to decrease to a preset refresh rate based on the received third mode command. During the process of reducing the refresh rate, it outputs an enable signal to the first power supply unit and the second power supply unit at the beginning of the blanking time of each frame. Based on the enable signal, the first power supply unit and the second power supply unit trigger the voltage output circuit to adjust the voltage during the blanking time according to the change value of the refresh rate, so that the change value of the refresh rate is adapted to the voltage value output by the voltage output circuit, and the adjusted voltage is output.

[0016] In one possible implementation, the timing controller is connected to the voltage output circuit via an interface unit;

[0017] The timing controller is connected to the voltage output circuit via an interface unit;

[0018] The voltage output circuit includes several transistors, several first resistors connected in series, and several adders; the first first resistor is connected to the reference voltage terminal, and the last first resistor is connected to the first voltage terminal; the transistors, first resistors, and adders correspond to each other;

[0019] Each output terminal of the interface unit is connected to the control electrode of the corresponding transistor.

[0020] The first input terminal of the adder is connected to one end of a corresponding first resistor and the first terminal of a corresponding transistor; the second input terminal of the adder is connected to a voltage feedback terminal; the output terminal of the adder is used to output voltage. In one possible implementation, the display device further includes a sensor;

[0021] The sensor is used to sense whether the user is within a preset range. When the user is not within the preset range, the sensor outputs a first sensing signal to the system controller, causing the system controller to output a first mode command. When the user is within the preset range, the sensor outputs a second sensing signal to the system controller, causing the system controller to output a second mode command.

[0022] In one possible implementation, the display device further includes a sensor; the sensor is used to sense whether the image displayed by the display module remains for a preset time, and when the image displayed by the display module remains for a preset time, it outputs a third sensing signal to the system controller, causing the system controller to output a third mode command.

[0023] Secondly, embodiments of this application provide a display device, including the display apparatus provided in any of the above embodiments.

[0024] Thirdly, this application provides a control method for a display device as provided in any of the above embodiments, wherein when a first mode command is received, the device enters a first working mode;

[0025] Control methods include:

[0026] S1: Output the first control signal to the second power supply unit to control the second power supply unit to shut down;

[0027] S2: Output a second control signal to the source driver to control the source driver to output a data signal for displaying a black screen to the display panel;

[0028] S3: Output a third control signal to the source driver to control the shutdown of some functions of the source driver;

[0029] S4: Output the fourth control signal to the first power supply unit to control the first power supply unit to shut down.

[0030] In one possible implementation, a second control signal is output to the source driver to control the source driver to output a data signal displaying a black screen to the display panel, including:

[0031] Output a second control signal to the source driver to control the source driver to output data signals that display at least 3 frames of black and white images to the display panel.

[0032] In one possible implementation, upon receiving a second mode command, the system enters the second working mode.

[0033] Control methods include:

[0034] S5: Output the fifth control signal to the source driver to control the activation of some functions of the source driver that has been turned off;

[0035] S6: Output the sixth control signal to the first power supply unit to control the first power supply unit to turn on;

[0036] S7: Output the seventh control signal to the source driver to control the source driver to output the data signal for displaying the normal picture to the display panel;

[0037] S8: Output the eighth control signal to the second power supply unit to control the second power supply unit to turn on.

[0038] In one possible implementation, a seventh control signal is output to the source driver to control the source driver to output a data signal for displaying a normal image to the display panel, including:

[0039] Output the seventh control signal to the source driver to control the source driver to output data signals that display at least two normal frames to the display panel.

[0040] In one possible implementation, upon receiving a third mode command, the system enters the third working mode.

[0041] Control methods include:

[0042] Based on the received third mode command, the refresh rate of the current display module is controlled to be reduced to a preset refresh rate. During the process of reducing the refresh rate, an enable signal is output to the first power supply unit and the second power supply unit at the beginning of the blanking time of each frame. Based on the enable signal, the first power supply unit and the second power supply unit trigger the voltage output circuit to adjust the voltage during the blanking time according to the change value of the refresh rate, so that the change value of the refresh rate is adapted to the voltage value output by the voltage output circuit, and the adjusted voltage is output.

[0043] The beneficial technical effects of the technical solutions provided in this application include:

[0044] The display device provided in this application includes a system controller and a display module. The display module includes a timing controller, a source driver, a first power supply unit, and a second power supply unit. The system controller is connected to the display module. The system controller outputs a first mode command to the timing controller of the display module. Based on the first mode command, the timing controller outputs corresponding control signals to the second power supply unit, the source driver, and the first power supply unit in a preset order to control them accordingly, thereby achieving entry into a 0Hz mode to reduce power consumption. Simultaneously, because the timing controller controls the source driver, the first power supply unit, and the second power supply unit in a preset order, no abnormal screen display occurs. By cooperating with each unit of the display module and controlling them in a preset order, this application can reduce the frequency of the display module to 0Hz to reduce power consumption without causing abnormal screen display.

[0045] Additional aspects and advantages of this application will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of this application. Attached Figure Description

[0046] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0047] Figure 1 This is a schematic diagram of the structure of a display device provided in an embodiment of this application;

[0048] Figure 2a A flowchart for entering 0Hz mode is provided as an embodiment of this application;

[0049] Figure 2b A timing diagram for entering 0Hz mode provided in an embodiment of this application;

[0050] Figure 3aA flowchart for exiting 0Hz mode provided in an embodiment of this application;

[0051] Figure 3b A timing diagram for exiting 0Hz mode provided in an embodiment of this application;

[0052] Figure 4 This application provides a timing diagram for entering a preset refresh frequency mode.

[0053] Figure 5 A circuit schematic diagram of a voltage output circuit provided in an embodiment of this application;

[0054] Figure 6 This is a schematic diagram illustrating the change in output voltage Vout when Offset is set to -3V, provided in an embodiment of this application.

[0055] Figure 7 This is a schematic diagram showing the change of output voltage Vout when Offset is set to 1V, provided as an embodiment of this application.

[0056] Figure 8 A schematic flowchart illustrating a control method for a display device provided in an embodiment of this application;

[0057] Figure 9 A flowchart illustrating another control method for a display device provided in an embodiment of this application. Detailed Implementation

[0058] This application is described in detail below. Examples of embodiments of this application are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. Furthermore, detailed descriptions of known technologies that are unnecessary for the features of this application are omitted. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0059] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0060] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this application means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or wireless coupling. The term “and / or” as used herein includes all or any units and all combinations of one or more associated listed items.

[0061] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments.

[0062] This application provides a display device. For example... Figure 1 As shown, the display device includes a system controller 1 and a display module 2; the system controller 1 and the display module 2 are connected. The display module 2 includes a timing controller 22, a source driver 23, a first power supply unit 24, a second power supply unit 25, and a display panel 26. The system controller 1 includes a graphics processing unit (GPU) 11, a first voltage module 12, and a second voltage module 13.

[0063] Specifically, source driver 23 is connected to display panel 26 and is used to output data signals to display panel 26; first power supply unit 24 is connected to source driver 23 and display panel 26 respectively and is used to power source driver 23 and display panel 26 GOA (Gate Driven on Array) circuits of display panel 26; second power supply unit 25 is connected to display panel 26 and is used to power pixel circuits of display panel 26. Optionally, first power supply unit 24 can be PMIC (Power Management IC). Second power supply unit 25 can be EL power (power supply unit for EL devices).

[0064] Specifically, the graphics processor 11 is connected to the timing controller 22 and outputs mode commands to the timing controller 22 to control the timing controller 22 to enter the corresponding operating mode. The first voltage module 12 is connected to the first power supply unit 24 and supplies power to the first power supply unit 24. The second voltage module 13 is connected to the second power supply unit 25 and supplies power to the second power supply unit 25. Optionally, the first voltage module 12 can be a bias voltage module, and the second voltage module 13 can be a battery component.

[0065] like Figure 1 , Figure 2a and Figure 2b As shown, the graphics processor 11 of the system controller 1 is connected to the timing controller 22 and is used to output a first output mode command to the timing controller 22 so that the display module 2 enters the first working mode. The first working mode is that the refresh rate of the display module 2 enters the 0 Hz mode.

[0066] The timing controller 22 is connected to the source driver 23, the first power supply unit 24, and the second power supply unit 25, respectively. Based on a received first mode command, it sequentially outputs a first control signal to the second power supply unit 25, a second control signal to the source driver 23, a third control signal to the source driver 23, and a fourth control signal to the first power supply unit 24. The first control signal controls the second power supply unit 25 to turn off; the second control signal controls the source driver 23 to output a data signal displaying a black screen to the display panel 26; the third control signal controls the source driver 23 to disable some functions; and the fourth control signal controls the first power supply unit 24 to turn off. This "partial function" can be a timing control function of the source driver 23.

[0067] Optionally, the display device may further include a sensor, which can be mounted on the display panel 26 of the display module 2. The sensor is used to sense whether the user is within a preset range. When the user is not within the preset range, the sensor outputs a first sensing signal to the system controller 1, causing the system controller 1 to output a first mode command to put the display module 2 into 0Hz mode. When the user is within the preset range, the sensor outputs a second sensing signal to the system controller 1, causing the system controller 1 to output a second mode command to put the display module 2 out of 0Hz mode.

[0068] Figure 2b and Figure 3bIn this code, "STV" represents the GOA start signal, which is also the trigger signal for the horizontal drive. "SD_out" represents the data signal output by the source driver 23; "Normal Data" represents the data signal output by the source driver 23 for displaying a normal image, and "Black Data" represents the data signal output by the source driver 23 for displaying a black image. "EL_EN" represents the enable pin of the second power supply unit 25. When EL_EN is low, it controls the second power supply unit to be off; when EL_EN is high, it controls the second power supply unit to be on. "SD_Wake" represents the wake-up pin of the source driver 23. When SD_Wake is low, it controls some functions of the source driver 23 to be off, so that these functions enter the wake-up state; when SD_Wake is high, it controls some functions of the source driver 23 to be on. "PM_EN" represents the enable pin of the first power supply unit 24. When PM_EN is low, it controls the first power supply unit to be off; when PM_EN is high, it controls the first power supply unit to be on. "<55ms" means less than 55 milliseconds. ">1ms" means greater than 1 millisecond.

[0069] like Figure 1 , Figure 2a and Figure 2b As shown below, the specific process of entering 0Hz mode will be described in detail.

[0070] Step 1: When the sensor detects that the user is not within the preset range, for example, when the sensor detects that the user is not in front of the display module, it outputs a first sensing signal to the system controller 1, so that the system controller 1 outputs a first mode command to the timing controller 22, so that the display module 2 enters the 0 Hz mode.

[0071] Step 2: The timing controller 22 receives the first mode command output by the system controller 1 through the EDP (Embedded DisplayPort) interface, and then outputs corresponding control signals to the source driver 23, the first power supply unit 24 and the second power supply unit 25 so that the source driver 23, the first power supply unit 24 and the second power supply unit 25 perform corresponding actions.

[0072] Step 3: First, the timing controller 22 outputs a first control signal to the second power supply unit 25, causing the enable terminal EL_EN of the second power supply unit 25 to go low, thereby controlling the second power supply unit 25 to shut down. Next, the timing controller 22 outputs a second control signal to the source driver 23, controlling the source driver 23 to output data signals that display at least 3 frames of black screen to the display panel 26 (at least 3 frames). The output of the first and second control signals can occur almost simultaneously.

[0073] Step 4: Next, the timing controller 22 outputs a third control signal to the source driver 23 through the P2P (Point-to-Point) interface, so that the wake-up terminal SD_Wake of the source driver 23 is low, thereby controlling the partial function of the source driver 23 to be turned off, so that the partial function enters the wake-up state.

[0074] Step 5: Finally, after a 1ms interval, the timing controller 22 outputs a fourth control signal to the first power supply unit 24, causing the enable terminal PM_EN of the first power supply unit 24 to go low, thereby controlling the first power supply unit 24 to shut down. This causes the first power supply unit 24 to sequentially shut down the power supply voltages to the GOA circuit of the display panel 26 in a preset order. It should be noted that the first power supply unit 24 needs to output several voltages to the GOA circuit of the display panel 26 to power the GOA circuit. The order in which these voltages are output is similar to existing technology and will not be elaborated here.

[0075] In summary, after the above steps, it will take approximately 100ms to complete the mode transition of the display module from normal display mode to 0Hz mode.

[0076] The display device provided in this application includes a system controller and a display module. The display module includes a timing controller, a source driver, a first power supply unit, and a second power supply unit. The system controller is connected to the display module. The system controller outputs a first mode command to the timing controller of the display module. Based on the first mode command, the timing controller outputs corresponding control signals to the second power supply unit, the source driver, and the first power supply unit in a preset order to control them accordingly, thereby achieving entry into a 0Hz mode to reduce power consumption. Simultaneously, because the timing controller controls the source driver, the first power supply unit, and the second power supply unit in a preset order, no abnormal screen display occurs. By cooperating with each unit of the display module and controlling them in a preset order, this application can reduce the frequency of the display module to 0Hz to reduce power consumption without causing abnormal screen display.

[0077] In some embodiments, such as Figure 3a and Figure 3b As shown, the graphics processor 11 of the system controller 1 is connected to the timing controller 22 and is used to output a second mode command to the timing controller 22 so that the display module 2 enters the second working mode. The second working mode is that the refresh rate of the display module 2 exits the 0 Hz mode.

[0078] The timing controller 22 is connected to the source driver 23, the first power supply unit 24, and the second power supply unit 25, respectively. Based on a received second mode command, it sequentially outputs a fifth control signal to the source driver 23, a sixth control signal to the first power supply unit 24, a seventh control signal to the source driver 23, and an eighth control signal to the second power supply unit 25. The fifth control signal is used to enable some functions of the previously disabled source driver 23; the sixth control signal is used to enable the first power supply unit 24; the seventh control signal is used to control the source driver 23 to output data signals for displaying a normal image to the display panel 26; and the eighth control signal is used to enable the second power supply unit 25. This latter function may be a part of the timing control function of the source driver 23.

[0079] like Figure 1 , Figure 2a and Figure 2b As shown below, the specific process of exiting 0Hz mode will be described in detail.

[0080] Step 1: When the sensor senses that the user is within a preset range, for example, when the sensor detects that the user has returned to the display module, it outputs a second sensing signal to the system controller 1, so that the system controller 1 outputs a second mode command to the timing controller 22, so that the display module 2 exits the 0 Hz mode.

[0081] Step 2: The timing controller 22 receives the second mode command output by the system controller 1 through the EDP (Embedded DisplayPort) interface, and then outputs corresponding control signals to the source driver 23, the first power supply unit 24 and the second power supply unit 25 so that the source driver 23, the first power supply unit 24 and the second power supply unit 25 perform corresponding actions.

[0082] Step 3: First, the timing controller 22 outputs a fifth control signal to the source driver 23 via the P2P (Point-to-Point) interface, causing the wake-up terminal SD_Wake of the source driver 23 to go high, thereby controlling the activation of some functions of the previously disabled source driver 23. This activation can be a portion of the timing control function of the source driver 23.

[0083] Step 4: Next, after an interval greater than 1 ms, the timing controller 22 outputs a sixth control signal (PM_EN = high level) to the first power supply unit 24, making the enable terminal PM_EN of the first power supply unit 24 high level, thereby controlling the first power supply unit 24 to turn on, so that the power supply voltages of the previously turned-off GOA circuit of the display panel 26 are turned on sequentially according to a preset order. It should be noted that the first power supply unit 24 needs to output several voltages to the GOA circuit of the display panel 26 to power the GOA circuit. The order of outputting these voltages is similar to that in the prior art and will not be described again here.

[0084] Step 5: Next, the timing controller 22 outputs the seventh control signal source driver 23 to control the source driver 23 to output data signals that display at least 2 frames of normal images to the display panel 26 (at least 2 frames), so that all voltages can be stabilized.

[0085] Step 6: Finally, the timing controller 22 outputs an eighth control signal to the second power supply unit 25, making the enable terminal EL_EN of the second power supply unit 25 high, thereby controlling the second power supply unit 25 to turn on, so that the power supply voltages output to the display panel 26 are turned on sequentially. It should be noted that the second power supply unit 25 needs to output several voltages to the pixel circuit of the display panel 26 to power the pixel circuit. The order of outputting several voltages is similar to that of the prior art and will not be described again here.

[0086] In summary, after the above steps, it will take approximately 100ms to complete the mode transition of the display module from 0Hz mode to normal display mode.

[0087] This embodiment of the application, by cooperating with each unit of the display module and controlling each unit of the display module in a preset order, will exit the display module from 0 Hz mode without any abnormal display phenomenon.

[0088] The above solution, by cooperating with each unit of the display module and controlling each unit of the display module in a preset order, can reduce the frequency of the display module to 0 Hz, thereby reducing power consumption, and will not cause abnormal screen display.

[0089] Another solution is to reduce the refresh rate of the display module to a preset refresh rate (such as 1Hz, 2Hz, etc.) to reduce power consumption and avoid abnormal screen display.

[0090] Optionally, the display device may also include a sensor for sensing whether the screen displayed by the display module remains unchanged for a preset time. When the sensor detects that the screen displayed by the display module remains unchanged for a preset time, for example, when the sensor detects that the screen of the display module has not moved for a long time, a third sensing signal is output to the system controller 1, so that the system controller 1 outputs a third mode command to make the display module 2 enter the preset refresh rate mode.

[0091] In some embodiments, the graphics processor 11 of the system controller 1 is connected to the timing controller 22 and is used to output a third mode command to the timing controller 22, so that the display module 2 enters a third operating mode. The third operating mode is that the refresh rate of the display module 2 enters a preset refresh rate mode, where the preset refresh rate is greater than 0 Hz and less than the current refresh rate. The frequency of the preset refresh rate mode is an extremely low frequency; for example, if the current refresh rate of the display module is 120 Hz, the preset refresh rate can be 1 Hz, 2 Hz, etc.

[0092] The timing controller 22 is used to control the refresh rate of the current display module to decrease to a preset refresh rate based on the received third mode command. During the process of reducing the refresh rate, it outputs an enable signal TCON_EN to the first power supply unit 24 and the second power supply unit 25 at the beginning of the blanking time of each frame. This enables the first power supply unit 24 and the second power supply unit 25 to trigger the voltage output circuit to adjust the voltage according to the change value of the refresh rate during the blanking time, so that the change value of the refresh rate is adapted to the voltage value output by the voltage output circuit, and the adjusted voltage is output.

[0093] This application embodiment reduces power consumption by lowering the refresh rate of the current display module to a preset refresh frequency. Furthermore, during the process of reducing the refresh frequency, the voltage output by the voltage output circuit changes accordingly, which can overcome the problem of voltage linkage during the process of reducing the refresh frequency. Moreover, the voltage adjustment occurs within the blanking time of one frame display time, so it will not cause the problem of screen flickering.

[0094] In some embodiments, such as Figure 5 As shown, the timing controller 22 is connected to the voltage output circuit 40 of the first power supply unit 24 and the voltage output circuit 40 of the second power supply unit 25 via the interface unit 30. The voltage output circuits 40 of the first power supply unit 24 and the second power supply unit 25 are identical. Optionally, the interface unit 30 can be an I2C interface unit.

[0095] Optionally, the voltage output circuit 40 includes a plurality of transistors T1, a plurality of first resistors R1 connected in series, and a plurality of adders; the first first resistor R1 is connected to the reference voltage terminal Vref, and the last first resistor R1 is connected to the first voltage terminal VGL; the transistors T1, the first resistors R2, and the adders 41 correspond to each other.

[0096] Each output terminal of interface unit 30 is connected to the control electrode of the corresponding transistor T1.

[0097] The first input terminal of adder 41 is connected to one end of the corresponding first resistor R1 and the first terminal of the corresponding transistor T1, and receives the bias voltage Offset obtained by voltage division through several first resistors R1.

[0098] The second input terminal of adder 41 is connected to the voltage feedback terminal to receive the feedback voltage Vf.

[0099] The output of adder 41 is used to output the voltage Vout. Specifically, as shown... Figure 5 As shown, the adder 41 includes a first balancing resistor R4, a second balancing resistor R5, an operational amplifier AM, and a feedback module 411.

[0100] Each output terminal of interface unit 30 is connected to the control electrode of the corresponding transistor T1.

[0101] The first terminal of each transistor T1 is connected to one end of the corresponding first resistor R1 and to one end of the first balancing resistor R4 of the corresponding adder 41 to output the bias voltage Offset obtained after voltage division by several first resistors R1; the other end of the first balancing resistor R4 is connected to the non-inverting input terminal of the operational amplifier AM, and the non-inverting input terminal of the operational amplifier AM is connected to the voltage feedback terminal through the second balancing resistor R5 to receive the feedback voltage Vf; the inverting input terminal of the operational amplifier AM is connected to the output terminal of the operational amplifier AM through the feedback module; the output terminal of the operational amplifier AM outputs the adjusted voltage; the second terminal of each transistor T1 is connected to the other end of the corresponding first resistor R1.

[0102] Optionally, the feedback module includes a second resistor R2 and a third resistor R3. One end of the second resistor R2 is connected to the output terminal of the operational amplifier AM, and the other end of the second resistor R2 is connected to the inverting input terminal of the operational amplifier AM and to one end of the third resistor R3. The other end of the third resistor R3 is connected to the ground terminal.

[0103] The resistance values ​​of the first balancing resistor R4, the second balancing resistor R5, the second resistor R2, and the third resistor R3 are equal. Optionally, the resistance values ​​of the first balancing resistor R4, the second balancing resistor R5, the second resistor R2, and the third resistor R3 are all 10kΩ.

[0104] Figure 5 Adder 41 is a non-inverting proportional budget amplifier. If the values ​​of the first balancing resistor R4, the second balancing resistor R5, the second resistor R2, and the third resistor R3 are all equal, it can be concluded that the voltage output of adder 41 is Vout = Offset + Vf.

[0105] like Figure 6 and Figure 7 As shown, Figure 6 This is a schematic diagram showing the change in output voltage Vout when the offset voltage is set to -3V. Figure 7 This is a schematic diagram showing the change in output voltage Vout when Offset is set to 1V.

[0106] Figure 6 In the above calculation, when the feedback voltage Vf is 0V and the bias voltage Offset is set to -3V, the output voltage Vout = 0 - 3V = -3V; when the feedback voltage Vf is -4V and the bias voltage Offset is set to -3V, the output voltage Vout = -4 - 3 = -7V; when the feedback voltage Vf is -6V and the bias voltage Offset is set to -3V, the output voltage Vout = -6 - 3 = -9V.

[0107] Because one voltage terminal of operational amplifier AM is connected to ground, and the other voltage terminal of operational amplifier AM is connected to the first voltage terminal VGL, the voltage at the ground terminal is 0V, and the voltage at the first voltage terminal VGL is negative, the range of the output voltage Vout of operational amplifier AM is VGL to 0V, that is, less than or equal to 0V. When the obtained output voltage Vout is positive, the output is 0V. Figure 7 In the above calculation, when the feedback voltage Vf is 0V and the bias voltage Offset is set to 1V, the output voltage Vout is 0V. When the feedback voltage Vf is -4V and the bias voltage Offset is set to 1V, the output voltage Vout = -4 + 1 = -3V; when the feedback voltage Vf is -6V and the bias voltage Offset is set to 1V, the output voltage Vout = -6 + 1 = -5V.

[0108] like Figure 4 and Figure 5 As shown below, the specific process of entering the preset refresh rate mode will be described in detail.

[0109] Figure 4In this context, STV represents the GOA start signal, which is also the trigger signal for the row drive. TCON_EN represents the enable signal output by the timing controller 22 to the first power supply unit 24 and the second power supply unit 25; I2C data represents the signal output by the timing controller 22 to the first power supply unit 24 and the second power supply unit 25 through the interface unit 30; Vout represents the voltage output by the voltage output circuit 40; and bias voltage represents the bias voltage.

[0110] Figure 5 In this context, Offset represents the bias voltage obtained after voltage division by several first resistors R1; Vf represents the feedback voltage received by the voltage feedback terminal. Specifically, if it is the voltage output circuit 40 of the first power supply unit 24, the voltage feedback terminal can be connected to the source driver and the display panel to receive the feedback voltage from the source driver and the feedback voltage from the display panel; if it is the voltage output circuit 40 of the second power supply unit 25, the voltage feedback terminal can be connected to the display panel to receive the feedback voltage from the display panel.

[0111] Specifically, this application adopts a novel circuit solution, which overcomes the problem of voltage linkage during the process of reducing the refresh rate by adjusting the output voltage Vout accordingly, thereby ensuring that the display screen does not flicker.

[0112] Specifically, during refresh rate changes (decreases or increases), the timing controller 22 outputs an enable signal TCON_EN to the first power supply unit 24 and the second power supply unit 25 at the beginning of the blanking time of each frame. This causes the first and second power supply units 24 and 25 to trigger the voltage output circuit 40 to adjust the voltage during the blanking time according to the refresh rate change, ensuring that the refresh rate change matches the voltage output value and outputs a correspondingly adjusted voltage Vout. When the refresh rate changes, the output voltage Vout also changes accordingly during the blanking time of each frame.

[0113] Furthermore, the output voltage Vout can be obtained through... Figure 5The voltage output circuit 40 is obtained from the input voltage. The voltage output circuit 40 starts operating based on the enable signal TCON_EN and adjusts the voltage during the blanking time of each frame. Specifically, the timing controller 22 outputs a control signal to the gate of transistor T1 through the interface unit 30. The gate of transistor T1 is turned on based on this control signal. After being divided by several first resistors R1, several bias voltages Offset are obtained and given to the first input terminal of the corresponding adder 41. The second input terminal of adder 41 receives the feedback voltage Vf. The output voltage Vout is obtained by adding or subtracting the bias voltage Offset received at the first input terminal and the feedback voltage Vf received at the second input terminal. Figure 6 and Figure 7 This diagram illustrates the variation of the output voltage Vout under different bias voltages Offset.

[0114] By using the above method, when the refresh rate changes, the output voltage Vout is dynamically changed by the change of the feedback voltage Vf, ensuring that there is no problem of screen flickering.

[0115] Based on the same inventive concept, embodiments of this application provide a display device, including the display apparatus provided in any of the above embodiments.

[0116] The display device provided in this application has the same inventive concept and the same beneficial effects as the previous embodiments. For the contents of the display device not shown in detail, please refer to the previous embodiments, and they will not be repeated here.

[0117] Based on the same inventive concept, this application provides a control method for a display device as provided in any of the above embodiments, wherein when a first mode command is received, the device enters a first working mode;

[0118] like Figure 8 As shown, the control methods include:

[0119] S1: Output the first control signal to the second power supply unit to control the second power supply unit to shut down;

[0120] S2: Output a second control signal to the source driver to control the source driver to output a data signal for displaying a black screen to the display panel;

[0121] S3: Output a third control signal to the source driver to control the shutdown of some functions of the source driver;

[0122] S4: Output the fourth control signal to the first power supply unit to control the first power supply unit to shut down.

[0123] The control method for the display device provided in this application controls each unit of the display module in a preset order, which can reduce the frequency of the display module to 0 Hz to reduce power consumption and prevent abnormal screen display.

[0124] Optionally, a second control signal is output to the source driver to control the source driver to output a data signal for displaying a black screen to the display panel, including:

[0125] Output a second control signal to the source driver to control the source driver to output data signals that display at least 3 frames of black and white images to the display panel.

[0126] In some embodiments, when a second mode command is received, the system enters a second operating mode;

[0127] like Figure 9 As shown, the control methods include:

[0128] S5: Output the fifth control signal to the source driver to control the activation of some functions of the source driver that has been turned off;

[0129] S6: Output the sixth control signal to the first power supply unit to control the first power supply unit to turn on;

[0130] S7: Output the seventh control signal to the source driver to control the source driver to output the data signal for displaying the normal picture to the display panel;

[0131] S8: Output the eighth control signal to the second power supply unit to control the second power supply unit to turn on.

[0132] Optionally, a seventh control signal is output to the source driver to control the source driver to output a data signal for displaying a normal image to the display panel, including:

[0133] Output the seventh control signal to the source driver to control the source driver to output data signals that display at least two normal frames to the display panel.

[0134] In some embodiments, upon receiving a third mode command, the system enters a third working mode;

[0135] Control methods include:

[0136] Based on the received third mode command, the refresh rate of the current display module is controlled to be reduced to a preset refresh rate. During the process of reducing the refresh rate, an enable signal is output to the first power supply unit and the second power supply unit at the beginning of the blanking time of each frame. Based on the enable signal, the first power supply unit and the second power supply unit trigger the voltage output circuit to adjust the voltage during the blanking time according to the change value of the refresh rate, so that the change value of the refresh rate is adapted to the voltage value output by the voltage output circuit, and the adjusted voltage is output.

[0137] By applying the embodiments of this application, at least the following beneficial effects can be achieved:

[0138] (1) The display device system controller and display module provided in this application embodiment include a timing controller, a source driver, a first power supply unit, and a second power supply unit. The system controller is connected to the display module. The system controller outputs a first mode command to the timing controller of the display module. Based on the first mode command, the timing controller outputs corresponding control signals to the second power supply unit, the source driver, and the first power supply unit in a preset order to control them accordingly, thereby achieving entry into 0Hz mode to reduce power consumption. At the same time, since the timing controller controls the source driver, the first power supply unit, and the second power supply unit in a preset order, there will be no abnormal screen display. By cooperating with each unit of the display module and controlling each unit of the display module in a preset order, this application embodiment can reduce the frequency of the display module to 0Hz to reduce power consumption and prevent abnormal screen display.

[0139] (2) This application embodiment reduces power consumption by lowering the refresh rate of the current display module to a preset refresh frequency. Furthermore, this application embodiment adopts a novel circuit solution, which changes the output voltage accordingly as the refresh frequency decreases, thereby overcoming the problem of voltage linkage during the process of reducing the refresh frequency and ensuring that the display screen does not flicker.

[0140] Those skilled in the art will understand that the steps, measures, and solutions in the various operations, methods, and processes discussed in this application can be alternated, modified, combined, or deleted. Furthermore, other steps, measures, and solutions in the various operations, methods, and processes discussed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted. Furthermore, steps, measures, and solutions in the prior art that are similar to those disclosed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted.

[0141] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0142] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0143] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0144] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0145] It should be understood that although the steps in the flowcharts of the accompanying figures are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the accompanying figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0146] The above description is only a partial embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A display device, characterized in that, include: System controller and display module; The display module includes: a timing controller, a source driver, a first power supply unit, a second power supply unit, and a display panel; The source driver is connected to the display panel and is used to output data signals to the display panel; the first power supply unit is connected to the source driver and the display panel respectively and is used to supply power to the source driver and the GOA circuit of the display panel; the second power supply unit is connected to the display panel and is used to supply power to the pixel circuit of the display panel. The system controller is connected to the timing controller and is used to output a first mode command to the timing controller so that the display module enters a first working mode, wherein the refresh rate of the display module enters a 0 Hz mode. The timing controller is connected to the source driver, the first power supply unit, and the second power supply unit respectively. Based on the received first mode command, it sequentially outputs a first control signal to the second power supply unit, a second control signal to the source driver, a third control signal to the source driver, and a fourth control signal to the first power supply unit. The first control signal is used to control the second power supply unit to turn off, the second control signal is used to control the source driver to output a data signal displaying a black screen to the display panel, the third control signal is used to control the source driver to disable some functions, and the fourth control signal is used to control the first power supply unit to turn off.

2. The display device according to claim 1, characterized in that, The timing controller is used to output a second control signal to the source driver based on the received first mode command, so as to control the source driver to output data signals that display at least 3 frames of black screen to the display panel.

3. The display device according to claim 1, characterized in that, The system controller is connected to the timing controller and is used to output a second mode command to the timing controller so that the display module enters a second working mode, wherein the second working mode is when the refresh rate of the display module exits the 0 Hz mode. The timing controller is connected to the source driver, the first power supply unit, and the second power supply unit, respectively. Based on the received second mode command, it sequentially outputs a fifth control signal to the source driver, a sixth control signal to the first power supply unit, a seventh control signal to the source driver, and an eighth control signal to the second power supply unit. The fifth control signal is used to control the activation of some functions of the source driver that has been turned off. The sixth control signal is used to control the activation of the first power supply unit. The seventh control signal is used to control the source driver to output data signals for displaying a normal picture to the display panel. The eighth control signal is used to control the activation of the second power supply unit.

4. The display device according to claim 3, characterized in that, The timing controller is used to output a seventh control signal to the source driver based on the received second mode command, so as to control the source driver to output data signals that display at least 2 frames of normal images to the display panel.

5. The display device according to claim 1, characterized in that, The system controller is connected to the timing controller and is used to output a third mode command to the timing controller so that the display module enters a third working mode. The third working mode is that the refresh frequency of the display module enters a preset refresh frequency mode, wherein the preset refresh frequency is greater than 0 Hz and less than the current refresh frequency. The timing controller is connected to the source driver, the first power supply unit, and the second power supply unit respectively; both the first power supply unit and the second power supply unit include a voltage output circuit. The timing controller is used to control the refresh rate of the current display module to decrease to a preset refresh rate based on the received third mode command. During the process of reducing the refresh rate, an enable signal is output to the first power supply unit and the second power supply unit at the beginning of the blanking time of each frame. This enables the first power supply unit and the second power supply unit to trigger the voltage output circuit to adjust the voltage during the blanking time according to the change value of the refresh rate, so that the change value of the refresh rate is adapted to the voltage value output by the voltage output circuit, and the adjusted voltage is output.

6. The display device according to claim 5, characterized in that, The timing controller is connected to the voltage output circuit via an interface unit; The voltage output circuit includes several transistors, several first resistors connected in series, and several adders; the first first resistor is connected to the reference voltage terminal, and the last first resistor is connected to the first voltage terminal; the transistors, the first resistors, and the adders correspond to each other; Each output terminal of the interface unit is connected to the control electrode of the corresponding transistor. The first input terminal of the adder is connected to the upper end of the corresponding first resistor and the first terminal of the corresponding transistor, with the upper end of each first resistor close to the first first resistor; the second input terminal of the adder is connected to the voltage feedback terminal; the output terminal of the adder is used to output voltage.

7. The display device according to claim 3, characterized in that, It also includes sensors; The sensor is used to sense whether the user is within a preset range. When the user is not within the preset range, the sensor outputs a first sensing signal to the system controller, causing the system controller to output a first mode command. When the user is within the preset range, the sensor outputs a second sensing signal to the system controller, causing the system controller to output a second mode command.

8. The display device according to claim 5, characterized in that, It also includes sensors; The sensor is used to sense whether the image displayed by the display module remains for a preset time. When the image displayed by the display module remains for a preset time, it outputs a third sensing signal to the system controller, causing the system controller to output a third mode command.

9. A display device, characterized in that, Includes the display device as described in any one of claims 1 to 8.

10. A control method for a display device as described in any one of claims 1 to 8, characterized in that, Upon receiving a first-mode command, it enters the first working mode; The control method includes: Output a first control signal to the second power supply unit to control the second power supply unit to shut down; Output a second control signal to the source driver to control the source driver to output a data signal for displaying a black screen to the display panel; Output a third control signal to the source driver to control the shutdown of some functions of the source driver; A fourth control signal is output to the first power supply unit to control the first power supply unit to shut down.

11. The control method for the display device according to claim 10, characterized in that, The step of outputting a second control signal to the source driver to control the source driver to output a data signal for displaying a black screen to the display panel includes: Output a second control signal to the source driver to control the source driver to output data signals that display at least 3 frames of black and white images to the display panel.

12. The control method for the display device according to claim 10, characterized in that, When a second mode command is received, the system enters the second working mode. The control method includes: Output the fifth control signal to the source driver to control the activation of some functions of the source driver that has been turned off; Output a sixth control signal to the first power supply unit to control the first power supply unit to turn on; Output the seventh control signal to the source driver to control the source driver to output the data signal for displaying a normal picture to the display panel; The eighth control signal is output to the second power supply unit to control the second power supply unit to turn on.

13. The control method for the display device according to claim 12, characterized in that, The seventh control signal is output to the source driver to control the source driver to output a data signal for displaying a normal image to the display panel, including: Output the seventh control signal to the source driver to control the source driver to output data signals that display at least two normal frames to the display panel.

14. The control method for the display device according to claim 10, characterized in that, Upon receiving a command for the third mode, enter the third working mode; The control method includes: Based on the received third mode command, the refresh rate of the current display module is controlled to be reduced to a preset refresh rate. During the process of reducing the refresh rate, an enable signal is output to the first power supply unit and the second power supply unit at the beginning of the blanking time of each frame. Based on the enable signal, the first power supply unit and the second power supply unit trigger the voltage output circuit to adjust the voltage during the blanking time according to the change value of the refresh rate, so that the change value of the refresh rate is adapted to the voltage value output by the voltage output circuit, and the adjusted voltage is output.

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