Display module and display device

Abstract

The display module and the display device are provided, and the display module of the embodiment of the present disclosure comprises: a display substrate, the display substrate comprises a pixel electrode and a common electrode for driving liquid crystal deflection, the pixel electrode defines an array of a plurality of sub-pixels, each sub-pixel comprises a main area and a secondary area arranged at intervals, the common electrode receives a common electrode signal, the main area of each sub-pixel is electrically connected to the second electrode of a first transistor, the secondary area is electrically connected to the second electrode of a second transistor and a third transistor, the first electrode of the first transistor and the second transistor is electrically connected to the same data signal line, the control electrode is electrically connected to the same scan signal line, the first electrode of the third transistor is electrically connected to a discharge signal line, and the control electrode is electrically connected to the scan signal line, and the display module further comprises: a discharge circuit configured to access the discharge signal line to the common electrode signal when receiving a low-level power-off signal. The display module of the embodiment of the present disclosure can avoid power-off flashing screen.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of display, and in particular, to a display module and a display device. BACKGROUND

[0002] Liquid Crystal Display (LCD) has color shift problem when viewed from different angles. In order to improve the problem, 3T8-domain pixel structure or 3TPLUS8-domain pixel structure is used in the related art. That is, the pixel electrode of each sub-pixel is divided into a main area and a secondary area, and there are 4 domains in the main area and the secondary area respectively, and the main area (also referred to as a bright area) and the secondary area (also referred to as a dark area) are provided with a pixel structure of 3 transistors.

[0003] The main area and the secondary area of each sub-pixel are connected to the same data signal line and the same scan signal line, but the pixel electrode of the secondary area is additionally connected to a discharge signal line via a transistor, so that the pixel voltages of the main area and the secondary area are different, and then the deflection directions of the liquid crystals in the main area and the secondary area are inconsistent, so as to improve the color shift of large view angle. However, when the display screen is powered off, as shown in FIG. 1, there is a voltage difference between the voltage of the discharge signal line and the voltage of the common electrode when the display screen is powered off, which causes the secondary area to light up and causes the problem of flash screen when the display screen is powered off. Figure 1 SUMMARY

[0004] In order to solve at least one of the above problems, a first aspect of the present disclosure provides a display module, comprising: a display substrate, the display substrate comprising a pixel electrode and a common electrode for driving liquid crystal deflection, the pixel electrode defining a plurality of sub-pixels arranged in an array, each sub-pixel comprising a main area and a secondary area arranged in intervals, the common electrode receiving a common electrode signal,

[0005] The main area of each sub-pixel is electrically connected to the second electrode of a first transistor, and the secondary area is electrically connected to the second electrodes of a second transistor and a third transistor, the first electrodes of the first transistor and the second transistor are electrically connected to the same data signal line, the control electrodes are electrically connected to the same scan signal line, the first electrode of the third transistor is electrically connected to a discharge signal line, and the control electrode is electrically connected to a scan signal line,

[0006] The display module further comprises: a discharge circuit, the discharge circuit being configured to connect the discharge signal line to the common electrode signal when receiving a low-level power-off signal.

[0007] Optionally, the discharge circuit comprises:

[0008] ​The first selection sub-circuit includes a control terminal, a first input terminal, a second input terminal, and an output terminal. The control terminal is connected to a power-off signal, the first input terminal is connected to a discharge signal, the second input terminal is connected to a common electrode signal, and the output terminal is electrically connected to a discharge signal line. The circuit is configured to transmit the common electrode signal to the output terminal in response to a low-level power-off signal, and transmit the discharge signal to the output terminal based on a high-level power-off signal.

[0009] The second selection subcircuit includes a control terminal, a first terminal and an output terminal, and is configured to transmit the common electrode signal to the data signal line via the output terminal in response to the control signal received by the control terminal when the power-down signal is at a low level.

[0010] Optionally, the first selection sub-circuit includes a fourth transistor and a fifth transistor, wherein a first electrode of the fourth transistor is electrically connected to the first input terminal, a second electrode is electrically connected to the first electrode of the fifth transistor and electrically connected to the output terminal of the first selection sub-circuit, and a control electrode is electrically connected to the control terminal of the first selection sub-circuit.

[0011] A second electrode of the fifth transistor is electrically connected to the second input terminal, and a control electrode thereof is electrically connected to the control terminal of the first selection sub-circuit.

[0012] Optionally, the fourth transistor is an N-type transistor, and the fifth transistor is a P-type transistor.

[0013] Optionally, the display module further includes: a discharge signal generating subcircuit for generating a discharge signal and a common electrode signal generating subcircuit for generating a common electrode signal.

[0014] Optionally, the discharge circuit includes: a control subcircuit, a first selection subcircuit, and a second selection subcircuit.

[0015] The control subcircuit is configured to output a feedback signal to the discharge signal generation subcircuit and output a control signal to the first selection subcircuit and the second selection subcircuit based on the low-level power-down signal.

[0016] The discharge signal generating sub-circuit outputs a high impedance state to the output terminal of the discharge signal based on the feedback signal, and outputs a discharge signal to the discharge signal line based on the high-level power-down signal.

[0017] The first selection sub-circuit outputs the common electrode signal to the discharge signal line based on the control signal,

[0018] The second selection sub-circuit outputs the common electrode signal to the data signal line based on the control signal.

[0019] Optionally, the first selection sub-circuit includes a sixth transistor, a first electrode of the sixth transistor is connected to the common electrode signal, a second electrode is electrically connected to the discharge signal line, and a control end is connected to the control signal.

[0020] Optionally, the second selection subcircuit includes a seventh transistor and an eighth transistor, wherein the first electrode of the seventh transistor is connected to the common electrode signal, the second electrode is electrically connected to the first electrode of the eighth transistor and electrically connected to the data signal line, and the control electrode is connected to the control signal.

[0021] The second electrode of the eighth transistor is electrically connected to the ground, and the control electrode is connected to the control signal.

[0022] Optionally, the display module further includes a flexible circuit board and a display driver chip arranged on the flexible circuit board, and the flexible circuit board is electrically connected to the display substrate.

[0023] The second selection sub-circuit is arranged in the display driver chip.

[0024] Optionally, the first selection sub-circuit is arranged in a non-display area of ​​the display substrate, or

[0025] The display module further includes a flexible circuit board and a display driver chip arranged on the flexible circuit board, and the first selection sub-circuit is arranged in the display driver chip.

[0026] A second aspect of the present disclosure provides a display device, comprising: the display module as described above.

[0027] The beneficial effects of the present disclosure are as follows:

[0028] In response to the current existing problems, the present disclosure develops a display module and a display device. By providing a discharge circuit, and when the discharge circuit receives a low-level power-off signal, the discharge signal line is connected to the common electrode signal, so that when the display module is powered off, the voltage of the pixel electrode in the secondary area is consistent with that of the common electrode, thereby avoiding the problem of screen flashing during power-off, improving the display effect, and having broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] Figure 1 A schematic timing diagram showing key ports of a display module in the related art;

[0031] Figure 2 A schematic diagram of a pixel circuit in a display module according to an embodiment of the present disclosure is shown;

[0032] Figure 3 A schematic timing diagram showing key ports of a display module according to an embodiment of the present disclosure;

[0033] Figure 4 A schematic diagram showing a display module according to an embodiment of the present disclosure;

[0034] Figure 5 A schematic diagram showing a display module according to another embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0035] To more clearly illustrate the present disclosure, the present disclosure is further described below in conjunction with preferred embodiments and accompanying drawings. Similar components in the accompanying drawings are represented by the same reference numerals. Those skilled in the art should understand that the specific description below is illustrative rather than restrictive and should not be used to limit the scope of protection of the present disclosure.

[0036] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in this disclosure should have the usual meanings understood by people with ordinary skills in the field to which this disclosure belongs. "First", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, "one", "an" or "the" and similar words do not indicate a quantity limitation, but rather indicate the existence of at least one. "Include" or "comprising" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0037] In addition, for ease of description, a signal port and a signal provided by the signal port are identified by the same symbol herein.

[0038] In order to solve at least one of the above problems, Figure 2 and Figure 3 As shown, an embodiment of the present disclosure provides a display module, including a display substrate,

[0039] The display substrate includes a pixel electrode and a common electrode for driving liquid crystal deflection. The pixel electrode defines a plurality of sub-pixels arranged in an array. Each sub-pixel includes a primary region and a secondary region arranged at intervals. The common electrode receives a common electrode signal.

[0040] The main area of ​​each sub-pixel is electrically connected to the second electrode of the first transistor T1, and the secondary area is electrically connected to the second electrodes of the second transistor T2 and the third transistor T3. The first electrodes of the first transistor T1 and the second transistor T2 are electrically connected to the same data signal line Data, and the control electrodes are electrically connected to the same scan signal line Gate. The first electrode of the third transistor T3 is electrically connected to the discharge signal line Discharge, and the control electrode is electrically connected to the scan signal line Gate.

[0041] The display module further includes a discharge circuit, wherein the discharge circuit is configured to connect a discharge signal line Discharge to a common electrode signal when receiving a low-level power-down signal.

[0042] In this embodiment, a discharge circuit is provided, and when the discharge circuit receives a low-level power-off signal, the discharge signal line is connected to the common electrode signal, so that when the display module is powered off, the voltage of the pixel electrode in the secondary area is consistent with that of the common electrode, thereby avoiding the problem of screen flashing when the power is off.

[0043] In a specific example, referring to Figure 4 As shown, the display module includes a display substrate 10 and a power supply circuit 20 .

[0044] For example, although not specifically shown, the display substrate 10 may include a first substrate, a second substrate, and a liquid crystal layer disposed between the first substrate and the second substrate, the liquid crystal layer containing liquid crystal. The display substrate 10 includes a pixel electrode and a common electrode. Depending on the pixel structure in the display substrate 10, it may be a vertical alignment (VA) or an in-plane switching (IPS) type. When the pixel structure is VA, the pixel electrode and the common electrode are respectively located on different substrates, for example, the pixel electrode is located on the array substrate, and the common electrode is located on the color filter substrate; when the pixel structure is IPS, the pixel electrode and the common electrode are both located on the same substrate, for example, the array substrate. The present disclosure does not limit the pixel structure.

[0045] Specifically, the display substrate includes pixel electrodes and common electrodes for driving liquid crystal deflection. The pixel electrodes define a plurality of sub-pixels arranged in an array, each sub-pixel including a primary region and a secondary region arranged at intervals, and the common electrode receives a common electrode signal. For example, the pixel structure is a 3T8-domain pixel structure or a 3TPLUS8-domain pixel structure. Of course, the number of domains in each sub-pixel is not limited to 8 and can also be set to other numbers as needed.

[0046] Reference Figure 2As shown, the main area of ​​each pixel electrode (corresponding to the first electrode of Cpx-main in the circuit diagram) is electrically connected to the second electrode of the first transistor T1, and the secondary area is electrically connected to the second electrode of the second transistor T2. The first electrodes of the first transistor T1 and the second transistor T2 are both electrically connected to the same data signal line Data, and the control electrodes of the first transistor T1 and the second transistor T2 are electrically connected to the same scan signal line Gate. Therefore, the main area and the secondary area corresponding to the same sub-pixel are written with the same data signal simultaneously. Differently, the secondary area is also electrically connected to a third transistor T3. Specifically, the first electrode of the third transistor T3 is electrically connected to the discharge signal line Discharge, the second electrode is electrically connected to the secondary area (corresponding to the first electrode of Cpx-sub in the circuit diagram), and the control electrode is electrically connected to the scan signal line Gate corresponding to the control electrodes of the first transistor T1 and the second transistor T2. When data needs to be written to the sub-pixel, the main area writes the data signal from the data signal line Data, and the secondary area writes the discharge signal using the discharge signal line Discharge at the same time as writing the data signal.

[0047] In particular, the power supply circuit 20 includes a first selection sub-circuit 201 and a second selection sub-circuit 202 .

[0048] The first selection sub-circuit 201 includes a control terminal, a first input terminal, a second input terminal, and an output terminal. The control terminal is connected to the power-off signal XON, the first input terminal is connected to the discharge signal Discharge, the second input terminal is connected to the common electrode signal VCOM, and the output terminal is electrically connected to the discharge signal line Discharge. The circuit is configured to transmit the common electrode signal VCOM to the output terminal in response to a low level of the power-off signal XON, and transmit the discharge signal Discharge to the output terminal in response to a high level of the power-off signal XON.

[0049] The second selection sub-circuit includes a control terminal, a first terminal and an output terminal, and is configured to transmit the common electrode signal VCOM to the data signal line Data via the output terminal in response to a control signal received by the control terminal when the power-down signal XON is at a low level.

[0050] Optionally, refer to Figure 4 As shown, the first selection sub-circuit 201 includes a fourth transistor T4 and a fifth transistor T5. The first electrode of the fourth transistor T4 is electrically connected to the first input terminal, the second electrode is electrically connected to the first electrode of the fifth transistor T5 and electrically connected to the output terminal of the first selection sub-circuit 201, and the control electrode is electrically connected to the control terminal of the first selection sub-circuit 201. The second electrode of the fifth transistor T5 is electrically connected to the second input terminal, and the control electrode is electrically connected to the control terminal of the first selection sub-circuit 201. The fourth transistor T4 is an N-type transistor, and the fifth transistor T5 is a P-type transistor.

[0051] Optionally, the second selection sub-circuit 202 includes a seventh transistor T7 and an eighth transistor T8. A first electrode of the seventh transistor T7 is connected to the common electrode signal VCOM, a second electrode is electrically connected to the first electrode of the eighth transistor T8 and to the data signal line Data, and a control electrode is connected to the control signal. A second electrode of the eighth transistor T8 is electrically connected to the ground terminal GND, and a control electrode is connected to the control signal.

[0052] The above configuration takes into account that the display module's power-off signal XON is typically at a low level during power-off. This characteristic is exploited by connecting it to the control terminal of the first selection sub-circuit 201 as its control signal. In response to the low-level power-off signal XON, the fifth transistor T5 turns on, thereby directly inputting the common electrode signal VCOM to the discharge signal line Discharge of the display substrate 10. Simultaneously, the seventh transistor T7 of the second selection sub-circuit 202 turns on, thereby connecting the data signal line Data to the common electrode signal VCOM. This ensures that, during power-off, the primary and secondary regions of the pixel electrode, as well as the common electrode, receive the same signal simultaneously. This ensures that there is no voltage difference between the upper and lower plates of the equivalent capacitor Cpx-sub formed by the pixel electrode and the common electrode in the secondary region, ensuring that the sub-pixels do not illuminate during the power-off process, thereby preventing screen flickering.

[0053] In addition, by setting the second selection subcircuit 202 to include the eighth transistor T8, and connecting the control electrode to the same control signal as the seventh transistor T7, the charges in the pixel electrode and the common electrode can be quickly transferred to the ground terminal GND when the display module is powered off, thereby accelerating the discharge speed of the display substrate.

[0054] Of course, refer to Figure 4 As shown, during the display process, whether a black screen or a normal image is displayed, the power-off signal XON is at a high level. At this time, the fourth transistor T4 is turned on and the fifth transistor T5 is turned off, and the discharge signal Discharge is normally provided to the discharge signal line Discharge; at the same time, the seventh transistor T7 and the eighth transistor T8 are also turned off, and the common electrode signal VCOM is not provided to the data signal line Data. Therefore, the data signal line Data and the discharge signal line Discharge cooperate to realize the picture display.

[0055] It should be noted that, referring to Figure 3 As shown, when the second sub-circuit 101 is implemented as a fourth transistor T4 and a fifth transistor T5, because the control electrode of the fifth transistor T5 is directly connected to the power-down signal XON, in actual operation, when the level of the power-down signal XON is less than the threshold voltage of the fifth transistor T5, the fifth transistor T5 can be turned on, which will not be repeated herein.

[0056] Continue to refer to Figure 4As shown, the display module also includes a display driver chip 50, and the second selection sub-circuit 202 is disposed within the display driver chip 50. In this case, the control signal received by the control terminal of the second selection sub-circuit 202 can come from the display driver chip 50. That is, when the power-down signal XON is at a low level, the display driver chip 50 outputs a control signal to the control terminal of the second selection sub-circuit 202, turning on the seventh transistor T7 and the eighth transistor T8. This causes the pixel electrodes of the sub-pixels in the display substrate 10 to be written with the common electrode signal VCOM via the data signal line Data. Optionally, the display module may include a flexible circuit board. When the flexible circuit board is manufactured using a COF process, the display driver chip 50 can be disposed on the flexible circuit board.

[0057] In addition, it should be noted that, although not shown in the figure, those skilled in the art should understand that the data signal line Data of the display substrate uses the Source output pin of the display driver chip 50 to receive the data signal during the display stage, that is, when the power-on signal XON is at a high level, which is not elaborated herein.

[0058] Continue to refer to Figure 4 As shown, in this example, the first selection subcircuit 201 can be implemented as a subcircuit unit independent of the display driver chip 50 and the display substrate 10. In this case, the first selection subcircuit 201 can be provided on a printed circuit board electrically connected to the display substrate 10, such as an XPCB board.

[0059] However, those skilled in the art will appreciate that this application is not intended to limit the specific location of the first selection subcircuit 201. Alternatively, the first selection subcircuit 201 can be directly located in the non-display area of ​​the display substrate 201, utilizing the driver circuit layer within the display substrate. Furthermore, the first selection subcircuit 201 can be located within the display driver chip 50. Regardless of whether the first selection subcircuit 201 is located in the non-display area of ​​the display substrate 10 or within the display driver chip 50, the discharge circuit 20 does not require additional manufacturing steps, effectively controlling process costs.

[0060] In addition, continue to refer to Figure 4 As shown, optionally, the display module further includes a discharge signal generating subcircuit 30 for generating a discharge signal Discharge and a common electrode signal generating subcircuit 40 for generating a common electrode signal VCOM. Optionally, the discharge signal generating subcircuit 30 and the common electrode signal generating subcircuit 40 are disposed on a printed circuit board, but the present disclosure is not limited thereto.

[0061] In another alternative embodiment, referring to Figure 5 As shown, the discharge circuit includes: a first selection sub-circuit 201 ′, a second selection sub-circuit 202 ′ and a control sub-circuit 203 .

[0062] The control sub-circuit 203 is configured to output a feedback signal Vre to the discharge signal generation sub-circuit 30 and output a control signal to the first selection sub-circuit 201' and the second selection sub-circuit 202' based on the low-level power-off signal XON. The discharge signal generation sub-circuit 30 outputs a high-impedance state to the output end of the discharge signal Discharge based on the feedback signal Vre, and outputs the discharge signal Discharge to the discharge signal line Discharge based on the high-level power-off signal XON. The first selection sub-circuit 201' outputs the common electrode signal VCOM to the discharge signal line Discharge based on the control signal, and the second selection sub-circuit 202' outputs the common electrode signal VCOM to the data signal line Data based on the control signal.

[0063] Optionally, refer to Figure 5 As shown, the first selection sub-circuit 201 ′ includes a sixth transistor T6 , a first electrode of the sixth transistor T6 is connected to the common electrode signal VCOM, a second electrode is electrically connected to the discharge signal line Discharge, and a control terminal is connected to the control signal.

[0064] Optionally, refer to Figure 5 As shown, the second selection sub-circuit 202' includes a seventh transistor T7 and an eighth transistor T8. The first electrode of the seventh transistor T7 is connected to the common electrode signal VCOM, the second electrode is electrically connected to the first electrode of the eighth transistor T8 and electrically connected to the data signal line Data, and the control electrode is connected to the control signal. The second electrode of the eighth transistor T8 is electrically connected to the ground terminal GND, and the control electrode is connected to the control signal.

[0065] Continue to refer to Figure 5As shown, the display module includes a display driver chip 50. The first selection sub-circuit 201', the second selection sub-circuit 202', and the control sub-circuit 203 can all be provided within the display driver chip 50. The control circuit 203 receives a power-off signal XON. When the received power-off signal XON is at a low level, it generates a feedback signal Vre and outputs it to the discharge signal generation sub-circuit 30. The discharge signal generation sub-circuit 30 sets the output pin that normally outputs the discharge signal Discharge during normal display to a high-impedance state. Simultaneously, the control sub-circuit 203 generates a control signal that simultaneously turns on the sixth transistor T6, the seventh transistor T7, and the eighth transistor T8, thereby simultaneously outputting the common electrode signal VCOM to the data signal line Data and the discharge signal line Discharge. In addition, because the common electrode of the display substrate 10 always receives the common electrode signal VCOM, when the power is turned off, the main area, secondary area, and common electrode in the pixel electrode are all at the same voltage, so there is no voltage difference between the two plates of the equivalent capacitor formed by the secondary area, the main area and the common electrode, ensuring that the sub-pixels will not light up during the power-off process, which can avoid flickering of the display panel.

[0066] In addition, by configuring the second selection subcircuit 202' to include the eighth transistor T8, and connecting the control electrode to the same control signal as the seventh transistor T7, the charges in the pixel electrode and the common electrode can be quickly transferred to the ground terminal GND when the display module is powered off, thereby accelerating the discharge speed of the display substrate.

[0067] Of course, refer to Figure 5 As shown, during the display process, whether a black screen or a normal image is displayed, the power-off signal XON is at a high level. At this time, the control sub-circuit 203 does not output a feedback signal or the output feedback signal cannot enable the discharge signal generation sub-circuit 30 to control the output pin to a high-impedance state. At the same time, the level of the control signal generated by the control sub-circuit 203 is an invalid level signal, the sixth transistor T6 is turned off, the seventh transistor T7 and the eighth transistor T8 are turned off, and the common electrode signal VCOM is not provided to the data signal line Data. Therefore, the data signal line Data and the discharge signal line Discharge cooperate to realize screen display.

[0068] It should also be noted that, although not shown in the figure, those skilled in the art should understand that the data signal line Data of the display substrate uses the Source output pin of the display driver chip 50 to receive the data signal during the display stage, that is, when the power-on signal XON is at a high level, which is not described in detail herein.

[0069] Continue to refer to Figure 4As shown, in this example, the first selection subcircuit 201 is disposed in the display driver chip 50. However, those skilled in the art will appreciate that this disclosure is not intended to limit the specific location of the first selection subcircuit 201. Alternatively, the first selection subcircuit 201 can also be disposed in the non-display area of ​​the display substrate, or on a printed circuit board electrically connected to the display substrate 10. However, regardless of whether the first selection subcircuit 201 is disposed in the non-display area of ​​the display substrate 10 or in the display driver chip 50, the discharge circuit 20 does not require additional manufacturing steps, thereby effectively controlling process costs.

[0070] Based on the same inventive concept, embodiments of the present disclosure further provide a display device comprising the display module described in the above embodiments. The display device can be any display product or component including a liquid crystal display, such as an electronic paper, a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, or a navigation system, and this embodiment is not intended to limit this.

[0071] The specific structure and functions of the above display module have been described in detail in the above embodiments and will not be repeated here.

[0072] In response to the current existing problems, the present disclosure develops a display module and a display device. By providing a discharge circuit, and when the discharge circuit receives a low-level power-off signal, the discharge signal line is connected to the common electrode signal, so that when the display module is powered off, the voltage of the pixel electrode in the secondary area is consistent with that of the common electrode, thereby avoiding the problem of screen flashing during power-off, improving the display effect, and having broad application prospects.

[0073] Obviously, the above embodiments of the present disclosure are merely examples for clearly illustrating the present disclosure, and are not intended to limit the implementation methods of the present disclosure. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solutions of the present disclosure are still within the scope of protection of the present disclosure.

Claims

1. A display module, characterized in that: including a display substrate, The display substrate includes a pixel electrode and a common electrode for driving liquid crystal deflection. The pixel electrode defines a plurality of sub-pixels arranged in an array. Each sub-pixel includes a primary region and a secondary region arranged at intervals. The common electrode receives a common electrode signal. The main area of ​​each sub-pixel is electrically connected to the second electrode of a first transistor, and the secondary area is electrically connected to the second electrodes of a second transistor and a third transistor. The first electrodes of the first transistor and the second transistor are electrically connected to the same data signal line, and the control electrodes are electrically connected to the same scanning signal line. The first electrode of the third transistor is electrically connected to a discharge signal line, and the control electrode is electrically connected to the scanning signal line. The display module further includes: a discharge circuit, wherein when receiving a low-level power-off signal, the discharge signal line is connected to the common electrode signal. The discharge circuit comprises: The first selection sub-circuit includes a control terminal, a first input terminal, a second input terminal, and an output terminal, wherein the control terminal receives the power-off signal, the first input terminal receives the discharge signal, the second input terminal receives the common electrode signal, and the output terminal is electrically connected to the discharge signal line. The circuit is configured to transmit the common electrode signal to the output terminal in response to a low-level power-off signal, and transmit the discharge signal to the output terminal based on a high-level power-off signal. The second selection subcircuit includes a control terminal, a first terminal and an output terminal, and is configured to transmit the common electrode signal to the data signal line via the output terminal in response to a control signal received by the control terminal when the power-down signal is at a low level.

2. The display module according to claim 1, wherein: The first selection sub-circuit includes a fourth transistor and a fifth transistor, The first electrode of the fourth transistor is electrically connected to the first input terminal, the second electrode is electrically connected to the first electrode of the fifth transistor and electrically connected to the output terminal of the first selection sub-circuit, and the control electrode is electrically connected to the control terminal of the first selection sub-circuit. The second electrode of the fifth transistor is electrically connected to the second input terminal, and the control electrode is electrically connected to the control terminal of the first selection sub-circuit.

3. The display module according to claim 2, wherein: The fourth transistor is an N-type transistor, and the fifth transistor is a P-type transistor.

4. The display module according to claim 1, wherein: The second selection subcircuit includes a seventh transistor and an eighth transistor, wherein a first electrode of the seventh transistor is connected to the common electrode signal, a second electrode is electrically connected to the first electrode of the eighth transistor and electrically connected to the data signal line, and a control electrode is connected to the control signal. The second electrode of the eighth transistor is electrically connected to the ground, and the control electrode is connected to the control signal.

5. The display module according to claim 1, wherein: It also includes a flexible circuit board and a display driver chip arranged on the flexible circuit board, wherein the flexible circuit board is connected to the display substrate. The second selection sub-circuit is arranged in the display driver chip.

6. The display module according to claim 1, wherein: The first selection sub-circuit is arranged in the non-display area of ​​the display substrate, or The display module further includes a flexible circuit board and a display driver chip disposed on the flexible circuit board, and the first selection sub-circuit is disposed in the display driver chip.

7. A display module, characterized in that: including a display substrate, The display substrate includes a pixel electrode and a common electrode for driving liquid crystal deflection. The pixel electrode defines a plurality of sub-pixels arranged in an array. Each sub-pixel includes a primary region and a secondary region arranged at intervals. The common electrode receives a common electrode signal. The main area of ​​each sub-pixel is electrically connected to the second electrode of a first transistor, and the secondary area is electrically connected to the second electrodes of a second transistor and a third transistor. The first electrodes of the first transistor and the second transistor are electrically connected to the same data signal line, and the control electrodes are electrically connected to the same scanning signal line. The first electrode of the third transistor is electrically connected to a discharge signal line, and the control electrode is electrically connected to the scanning signal line. The display module further includes: a discharge circuit, wherein when receiving a low-level power-off signal, the discharge signal line is connected to the common electrode signal. The display module further includes: a discharge signal generating subcircuit for generating a discharge signal and a common electrode signal generating subcircuit for generating a common electrode signal. The discharge circuit includes: a control subcircuit, a first selection subcircuit and a second selection subcircuit, The control subcircuit is configured to output a feedback signal to the discharge signal generation subcircuit and output a control signal to the first selection subcircuit and the second selection subcircuit based on the low-level power-down signal. The discharge signal generating sub-circuit outputs a high impedance state to the output terminal of the discharge signal based on the feedback signal, and outputs a discharge signal to the discharge signal line based on the high level power-down signal. The first selection sub-circuit outputs the common electrode signal to the discharge signal line based on the control signal, The second selection sub-circuit outputs the common electrode signal to the data signal line based on the control signal.

8. The display module according to claim 7, wherein: The first selection sub-circuit includes a sixth transistor, a first electrode of the sixth transistor is connected to the common electrode signal, a second electrode is electrically connected to the discharge signal line, and a control terminal of the sixth transistor is connected to the control signal.

9. The display module according to claim 7, wherein: The second selection subcircuit includes a seventh transistor and an eighth transistor, wherein a first electrode of the seventh transistor is connected to the common electrode signal, a second electrode is electrically connected to the first electrode of the eighth transistor and electrically connected to the data signal line, and a control electrode is connected to the control signal. The second electrode of the eighth transistor is electrically connected to the ground, and the control electrode is connected to the control signal.

10. The display module according to claim 7, wherein: It also includes a flexible circuit board and a display driver chip arranged on the flexible circuit board, wherein the flexible circuit board is connected to the display substrate. The second selection sub-circuit is arranged in the display driver chip.

11. The display module according to claim 7, wherein: The first selection sub-circuit is arranged in the non-display area of ​​the display substrate, or The display module further includes a flexible circuit board and a display driver chip disposed on the flexible circuit board, and the first selection sub-circuit is disposed in the display driver chip.

12. A display device, characterized in that: include: The display module according to any one of claims 1 to 11.

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