Display module and display device

Abstract

The embodiment of the invention discloses a display module and a display device. The display module comprises a main control chip and a backlight module. The backlight module comprises a backlight driving chip and a plurality of light-emitting elements, the backlight driving chip comprises a mode switching circuit, and the mode switching circuit is connected with the light-emitting elements and the main control chip and used for switching the working states of the light-emitting elements into a first working state according to a first control signal output by the main control chip; in the first working state, the light-emitting elements stop emitting light. Therefore, the mode switching circuit is additionally arranged in the backlight driving chip, and the control instruction is directly sent to the mode switching circuit through the main control chip, so that the working states of the plurality of light-emitting elements are directly controlled through the mode switching circuit, the control delay is reduced, and the effect of real-time response is achieved. And when the plurality of light-emitting elements work normally subsequently, the backlight driving chip does not need to be initialized, so that the operation is simple, and the degree of freedom is large.

Description

Technical Field

[0001] The present invention relates to the field of display technologies, and particularly to a display module and a display device. Background Art

[0002] In the backlight control of existing display modules, if it is necessary to turn off the backlight brightness midway, a timing control chip is usually used for indirect control. However, this control method is relatively complex, has a certain delay, and there is also a situation where the backlight brightness cannot be turned off during some time periods, resulting in a low degree of freedom in backlight control and inability to control at any time. Summary of the Invention

[0003] The present invention provides a display module and a display device, which directly control the working states of multiple light-emitting elements through a mode switching circuit, reduce the control delay, and achieve the effect of real-time response. And subsequently, when multiple light-emitting elements are working normally, there is no need to initialize the backlight driving chip, the operation is simple, and the degree of freedom is large.

[0004] On the one hand, an embodiment of the present invention provides a display module.

[0005] The display module includes a main control chip and a backlight module.

[0006] The backlight module includes a backlight driving chip and multiple light-emitting elements.

[0007] The backlight driving chip includes a mode switching circuit.

[0008] The mode switching circuit is respectively connected to the light-emitting elements and the main control chip, and is used to switch the working states of the multiple light-emitting elements to a first working state according to a first control signal output by the main control chip; in the first working state, the multiple light-emitting elements stop emitting light.

[0009] On the other hand, an embodiment of the present invention further provides a display device, including the display module provided in any embodiment of the first aspect of the present invention.

[0010] The display module provided by the embodiment of the present invention adds a mode switching circuit in the backlight driving chip, and the main control chip directly sends a control signal to the mode switching circuit, so that the mode switching circuit directly controls the working states of a plurality of light-emitting elements. In this way, when it is necessary to turn off a plurality of light-emitting elements, the main control chip can directly send a first control signal to the mode switching circuit, and the mode switching circuit directly switches the working states of the plurality of light-emitting elements to the first working state according to the first control signal. In the first working state, the plurality of light-emitting elements stop working. Since an additional circuit is used to separately control the working states of the plurality of light-emitting elements, a real-time response effect can also be achieved in the timing control stage of power-on and power-off. And in the first working state, it is the plurality of light-emitting elements that stop working, while the backlight driving chip still works normally. Furthermore, when the mode switching circuit switches the plurality of light-emitting elements to emit light, it is not necessary to initialize the backlight driving chip, and the plurality of light-emitting elements can be directly switched to emit light, with simple operation and large freedom. Description of the Drawings

[0011] Figure 1 is a schematic diagram of the control function of a display module in the related art;

[0012] Figure 2 is a schematic diagram of the control function of a display module provided by an embodiment of the present invention;

[0013] Figure 3 is a schematic diagram of the control function of another display module provided by an embodiment of the present invention;

[0014] Figure 4 is a schematic diagram of the control function of yet another display module provided by an embodiment of the present invention;

[0015] Figure 5 is a schematic diagram of the control function of yet another display module provided by an embodiment of the present invention;

[0016] Figure 6 is a schematic diagram of the control function of yet another display module provided by an embodiment of the present invention;

[0017] Figure 7 is a schematic diagram of the control function of yet another display module provided by an embodiment of the present invention;

[0018] Figure 8 is a schematic diagram of the structure of a switching unit provided by an embodiment of the present invention;

[0019] Figure 9 is a schematic diagram of the control function of yet another display module provided by an embodiment of the present invention;

[0020] Figure 10 is a schematic diagram of the structure of a display device provided by an embodiment of the present invention. Detailed Embodiments

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0022] Figure 1 is a schematic diagram of the control function of a display module in the related art. Refer to Figure 1 , the display module in the prior art includes a main control chip 01', a backlight module and a timing controller 02'. The backlight module includes a backlight driving chip 03' and a light emitting element group 04'. Among them, the timing controller 02' is respectively communicatively connected to the main control chip 01' and the backlight driving chip 03', and the backlight driving chip 03' is electrically connected to the light emitting element group 04'. Under normal circumstances, the main control chip 01' sends a driving control signal to the timing controller 02', and the timing controller 02' converts the driving signal of the main control chip 01' into a driving signal of the backlight module, and sends the converted driving signal to the backlight driving chip 03' to control the light emitting element group 04' to emit light through the backlight driving chip 03'. If it is necessary to turn off the backlight of the backlight module in the middle (that is, turn off the light emitting element group 04'), it is also necessary for the main control chip 01' to send a turn-off control instruction to the timing controller 02', and the timing controller 02' indirectly controls the backlight driving chip 03' to turn off the light emitting element group 04'. However, since the backlight data of the timing controller 02' is updated once per frame, that is to say, when using the indirect control of the timing controller 02', it is necessary to delay one frame to achieve, and in some timings, it is impossible to turn off the backlight in the middle. For example, when powering on and off, the timing controller 02' needs to be initialized, and at this time, the backlight cannot be controlled, and the degree of control freedom is relatively low. If the backlight brightness of the backlight module is turned off in the middle by switching the backlight power supply, after power-on, it is necessary to re-initialize the backlight driving chip, that is, the response after restarting after turning off in the middle is slow, and the overall operation is complex.

[0023] Based on the above technical problems, an embodiment of the present invention provides a display module. By utilizing the original functional circuit of the backlight driving chip, a mode switching circuit is newly added to the backlight driving chip, and the mode switching circuit is respectively connected to the main control chip and multiple light-emitting elements, so as to directly control the working states of the multiple light-emitting elements through the mode switching circuit. In this way, if it is necessary to turn off multiple light-emitting elements during operation, the main control chip directly sends a first control signal to the mode switching circuit, and the mode switching circuit directly switches the working states of the multiple light-emitting elements to the first working state according to the first control signal, that is, directly controls the multiple light-emitting elements to stop working. Since the mode switching circuit is a newly added circuit in the backlight driving chip that is specifically responsible for controlling the working states of the multiple light-emitting elements, therefore, a real-time response effect can also be achieved in the timing control stage of power-on and power-off, reducing the control delay and providing the freedom of control. And since in the first working state, only the multiple light-emitting elements stop working, while the backlight driving chip still works normally, further, when the mode switching circuit switches the multiple light-emitting elements to work, it is not necessary to re-initialize the backlight driving chip and other preparatory work, and the multiple light-emitting elements can be directly switched to emit light, with a short switching delay, achieving the effect of real-time control.

[0024] The above is the core idea of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention. The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention.

[0025] Figure 2 It is a schematic diagram of the control function of a display module provided by an embodiment of the present invention. Refer to Figure 2 , the display module includes a main control chip 01 and a backlight module 02. The backlight module 02 includes a backlight driving chip 10 and multiple light-emitting elements 20. The backlight driving chip 10 includes a mode switching circuit 110. The mode switching circuit 110 is respectively connected to the light-emitting elements 20 and the main control chip 01, and is used to switch the working states of the multiple light-emitting elements 20 to the first working state according to the first control signal output by the main control chip 01. In the first working state, the multiple light-emitting elements 20 stop emitting light.

[0026] Specifically, the display module includes a main control chip 01 and a backlight module 02. Among them, the main control chip 01 is the main processor in the display module, mainly used for processing various data, running the operating system, decoding video signals, image optimization, etc. The backlight module 02 includes a backlight driving chip 10 and a plurality of light-emitting elements 20. The backlight driving chip 10 is the core control unit of the backlight module 02, responsible for converting electrical energy into a driving signal suitable for the backlight source (a plurality of light-emitting elements 20). The backlight driving chip 10 is electrically connected to the plurality of light-emitting elements 20, and then the brightness of the plurality of light-emitting elements is adjusted through the backlight driving chip 10, or global dimming and local dimming of the backlight module 02 are realized. On this basis, in the embodiment of the present invention, a mode switching circuit 110 is newly added to the backlight driving chip 10. It can be understood that the backlight driving chip 10 is made by integrating a variety of different circuit structures. Therefore, the original circuit structure in the backlight driving chip 10 can be used to form the mode switching circuit 110. In this way, when setting the backlight driving chip 10 to include the mode switching circuit 110, no new devices need to be added, and thus the manufacturing cost of the display module can be reduced. The mode switching circuit 110 is respectively connected to the main control chip 01 and the plurality of light-emitting elements 20, and then the working states of the plurality of light-emitting elements 20 can be directly controlled through the mode switching circuit 110.

[0027] Exemplarily, if it is necessary to turn off the plurality of light-emitting elements 20 during operation, the main control chip 01 directly sends a first control signal to the mode switching circuit 110. It can be understood that the first control signal can be a turn-off control signal. After receiving the first control signal, the mode switching circuit 110 can directly switch the working states of the plurality of light-emitting elements 20 to the first working state. In the first working state, the plurality of light-emitting elements 20 work in the silent mode, that is, the plurality of light-emitting elements 20 do not emit light. In the above process, since the mode switching circuit 110 is a newly added circuit in the backlight driving chip 10 that is specifically responsible for controlling the working states of the plurality of light-emitting elements, that is, the mode switching circuit 110 is a part independent of other functional circuits in the backlight driving chip 10 and is directly controlled by the main control chip 01, a real-time response effect can be achieved, and the control delay is reduced. In addition, the technical solution of the present application can also turn off the plurality of light-emitting elements 20 during the power-on and power-off timing control stage of the timing controller. Therefore, compared with the prior art solution of indirectly controlling through the timing controller, the degree of freedom of backlight control can also be improved.

[0028] It should be noted that when the backlight of the backlight module 02 needs to be turned on subsequently, it can also be directly controlled by the mode switching circuit 110. Specifically, the mode switching circuit 110 is further configured to switch the operating states of the plurality of light-emitting elements 20 to a second operating state according to a second control signal of the main control chip 01. In the second operating state, the plurality of light-emitting elements 20 operate normally. Exemplarily, since in the first operating state, only the plurality of light-emitting elements 20 stop operating while the backlight driving chip 10 still operates normally, when it is necessary to switch the operation of the plurality of light-emitting elements 20, the main control chip 01 can send a second control signal to the mode switching circuit 110. Among them, the second control signal can be a conduction control signal, and the mode switching circuit 110 directly switches the operating states of the plurality of light-emitting elements 20 to the second operating state according to the second control signal, that is, the plurality of light-emitting elements 20 emit light. In the above process, compared with the method of turning off the backlight power supply and then starting, there is no need to re-initialize the backlight driving chip 10 and other preparatory work, and the operating states of the plurality of light-emitting elements 20 can be directly switched to the second operating state, reducing the switching delay and achieving the effect of real-time control.

[0029] It should also be noted that the embodiment of the present invention does not limit the connection manner between the main control chip 01 and the mode switching circuit 110. In one embodiment, the backlight driving chip 10 further includes control pins (not shown in the figure), and the control pins are electrically connected to the main control chip 01 and the mode switching circuit 110 respectively. The main control chip 01 sends a first control signal to the mode switching circuit 110 through the control pins. Furthermore, signals are transmitted between the main control chip 01 and the mode switching circuit 110 through the control pins, ensuring a simple signal transmission manner. In other embodiments, the main control chip 01 and the mode switching circuit 110 can also be communicatively connected through a serial interface. Exemplarily, short-distance data transmission can be achieved between the main control chip 01 and the mode switching circuit 110 through SPI (Serial Peripheral Interface) or I2C (Inter-Integrated Circuit). In this way, the signal traces between the main control chip 01 and the mode switching circuit 110 can be reduced. It can be understood that when different signal transmission methods are adopted, the types of control signals sent by the main control chip 01 are different. For example, when the control signal is transmitted through the control pins, the control signal can be a high-low level signal, and when communication is performed through the serial interface, the control signal can be an instruction signal, which can be set by those skilled in the art according to needs.

[0030] Optionally, in one embodiment, Figure 3 is a schematic diagram of the control function of another display module provided by the embodiment of the present invention. Refer to Figure 3, the mode switching circuit 110 includes a mode switching unit 111 and a function control unit 112. One end of the mode switching unit 111 is connected to the main control chip 01, and the other end is connected to the function control unit 112. The function control unit 112 is connected to the light-emitting element 20. The mode switching unit 111 is configured to generate a turn-off modulation signal according to the first control signal of the main control chip 01, and send the turn-off modulation signal to the function control unit 112, so that the function control unit 112 outputs a turn-off signal to the light-emitting element 20 according to the turn-off modulation signal.

[0031] Exemplarily, as Figure 3 shown in the embodiment, the mode switching circuit 110 includes a mode switching unit 111 and a function control unit 112. Among them, the mode switching unit 111 is mainly configured to generate a modulation signal of the light-emitting element 20 according to the control signal of the main control chip 01. The function control unit 112 is mainly configured to generate a current adjustment signal and / or a pulse modulation signal according to the modulation signal of the mode switching unit 111, so as to adjust the working state of the plurality of light-emitting elements 20 by outputting current or duty ratio. Specifically, if it is necessary to turn off the backlight (a plurality of light-emitting elements 20) during operation, the main control chip 01 can directly send a first control signal to the mode switching unit 111. The mode switching unit 111 generates a turn-off modulation signal according to the first control signal, and sends the turn-off modulation signal to the function control unit 112, so that the function control unit 112 generates a turn-off signal according to the turn-off modulation signal, and sends the turn-off signal to the plurality of light-emitting elements 20, and the plurality of light-emitting elements 20 stop emitting light. Similarly, if it is necessary to turn on the backlight (a plurality of light-emitting elements 20) subsequently, the main control chip 01 can directly send a second control signal to the mode switching unit 111. The mode switching unit 111 generates a turn-on modulation signal according to the second control signal, and sends the turn-on modulation signal to the function control unit 112, so that the function control unit 112 generates a turn-on signal according to the turn-on modulation signal, and sends the turn-on signal to the plurality of light-emitting elements 20, and the plurality of light-emitting elements 20 start to emit light. In this way, the working state of the light-emitting element 20 is jointly controlled by the mode switching unit 111 and the function control unit 112. On the basis of reducing the control delay of the backlight control and providing the freedom of control, it is ensured that the structure and control method of the mode switching circuit 110 are simple.

[0032] Optionally, in another embodiment, Figure 4 is a schematic diagram of the control function of another display module provided by an embodiment of the present invention. Refer to Figure 4, the mode switching unit 111 includes a mode controller 111a. One end of the mode controller 111a is connected to the main control chip 01, and the other end is connected to the function control unit 112. The mode controller 111a is configured to generate a turn-off modulation signal according to the first control signal and send the turn-off modulation signal to the function control unit 112.

[0033] Exemplarily, as Figure 4 shown in the embodiment, the mode switching unit 111 includes a mode controller 111a. The input end of the mode controller 111a is connected to the main control chip 01, and the output end of the mode controller 111a is directly electrically connected to the input end of the function control unit 112. Further, in the embodiment of the present invention, the mode controller 111a adopts a direct control method to directly control the light-emitting element 20 by the mode switching circuit 110. Specifically, if it is necessary to turn off the backlight (multiple light-emitting elements 20) during operation, the main control chip 01 can directly send the first control signal to the mode controller 111a. The mode controller 111a generates a turn-off modulation signal according to the first control signal and sends the turn-off modulation signal to the function control unit 112, so that the function control unit 112 generates a turn-off signal according to the turn-off modulation signal and sends the turn-off signal to the multiple light-emitting elements 20, and the multiple light-emitting elements 20 stop emitting light. Similarly, if it is necessary to turn on the backlight (multiple light-emitting elements 20) subsequently, the main control chip 01 can directly send the second control signal to the mode controller 111a. The mode controller 111a generates a conduction modulation signal according to the second control signal and sends the conduction modulation signal to the function control unit 112, so that the function control unit 112 generates a turn-on signal according to the conduction modulation signal, and then sends the turn-on signal to the multiple light-emitting elements 20, and the multiple light-emitting elements 20 start to emit light. Thus, by directly controlling the function control unit 112 by the mode controller 111a, the working state of the light-emitting element 20 is controlled, reducing the control delay of the backlight control and providing the freedom of control, and ensuring that the structure and control method of the mode switching circuit 110 are simple.

[0034] Optionally, in another embodiment, Figure 5 is a schematic diagram of the control function of another display module provided by the embodiment of the present invention. Refer to Figure 5 , the mode switching unit 111 includes a logic controller 111b and a mode controller 111a. One end of the mode controller 111a is connected to the main control chip 01, the other end is connected to the logic controller 111b, and the logic controller 111b is connected to the function control unit 112. The mode controller 111a is configured to generate a function control signal according to the first control signal and send the function control signal to the logic controller 111b, so that the logic controller 111b generates a turn-off modulation signal according to the function control signal and sends the turn-off modulation signal to the function control unit 112.

[0035] Exemplarily, as Figure 5 shown in the embodiment, the mode switching unit 111 includes a logic controller 111b and a mode controller 111a. The output end of the main control chip 01 is connected to the input end of the mode controller 111a, the output end of the mode controller 111a is electrically connected to the input end of the logic controller 111b, and the output end of the logic controller 111b is connected to the input end of the function control unit 112. Thus, in the embodiment of the present invention, the mode switching circuit 110 directly controls the light-emitting element 20 through the indirect control mode of the mode controller 111a combined with the logic controller 111b. Specifically, if it is necessary to turn off the backlight (multiple light-emitting elements 20) during operation, the main control chip 01 can directly send a first control signal to the mode controller 111a. The mode controller 111a generates a function control signal (a turn-off function control signal for switching to the first working state) according to the first control signal, and sends the turn-off function control signal to the logic controller 111b, so that the logic controller 111b generates a turn-off modulation signal according to the turn-off function control signal, and sends the turn-off modulation signal to the function control unit 112, so that the function control unit 112 generates a turn-off signal according to the turn-off modulation signal, and then sends the turn-off signal to the multiple light-emitting elements 20, and the multiple light-emitting elements 20 stop emitting light. Similarly, if it is necessary to turn on the backlight (multiple light-emitting elements 20) subsequently, the main control chip 01 can directly send a second control signal to the mode controller 111a. The mode controller 111a generates a function control signal (a turn-on function control signal for switching to the second working state) according to the second control signal, and sends the turn-on function control signal to the logic controller 111b, so that the logic controller 111b generates a turn-on modulation signal according to the turn-on function control signal, and sends the turn-on modulation signal to the function control unit 112, so that the function control unit 112 generates a turn-on signal according to the turn-on modulation signal, and then the function control unit 112 sends the turn-on signal to the multiple light-emitting elements 20, and the multiple light-emitting elements 20 start to emit light. In this way, since the control of the logic controller 111b over the function control unit 112 is more precise, the function control unit 112 is indirectly controlled by the mode controller 111a combined with the logic controller 111b. On the basis of reducing the control delay of the backlight control and providing the freedom of control, the control of the mode switching circuit 110 is ensured to be more precise.

[0036] Optionally, on the basis of the above embodiment, Figure 6 is a schematic diagram of the control function of another display module provided by the embodiment of the present invention. Refer to Figure 6, the function control unit 112 includes a pulse modulation generator 112a and a current generator 112b. The other end of the mode switching unit 111 is connected to at least one of the pulse modulation generator 112a and the current generator 112b. The mode switching unit 111 is configured to generate a first turn-off modulation signal according to the first turn-off control signal of the main control chip 01, and send the first turn-off modulation signal to the pulse modulation generator 112a, so that the pulse modulation generator 112a outputs a first turn-off signal with a duty cycle of zero to the plurality of light-emitting elements 20; and / or, the mode switching unit 111 is configured to generate a second turn-off modulation signal according to the second turn-off control signal of the main control chip 01, and send the second turn-off modulation signal to the current generator 112b, so that the current generator 112b outputs a second turn-off signal with a current value of zero to the plurality of light-emitting elements 20.

[0037] Exemplarily, as Figure 6 shown in the embodiment, only by way of example, the first output terminal of the mode switching unit 111 is electrically connected to the input terminal of the pulse modulation generator 112a, and the second output terminal is electrically connected to the input terminal of the current generator 112b for illustration, but it is not limited thereto. In other embodiments, the mode switching unit 111 may also be only electrically connected to the pulse modulation generator 112a, or only electrically connected to the current generator 112b, and those skilled in the art can set it according to needs. Specifically, if it is necessary to turn off the backlight (a plurality of light-emitting elements 20) during operation, the main control chip 01 can directly send a first turn-off control signal to the mode switching unit 111. The mode switching unit 111 generates a first turn-off modulation signal (for controlling the pulse modulation generator 112a) according to the first turn-off control signal, and then sends the first turn-off control signal to the pulse modulation generator 112a through the first output terminal, so that the pulse modulation generator 112a outputs a first turn-off signal with a duty cycle of zero, and sends the first turn-off signal to the plurality of light-emitting elements 20. Under the action of the first turn-off signal, the plurality of light-emitting elements 20 stop emitting light; and / or, the main control chip 01 can directly send a second turn-off control signal to the mode switching unit 111. The mode switching unit 111 generates a second turn-off modulation signal (for controlling the current generator 112b) according to the second turn-off control signal, and then sends the second turn-off control signal to the current generator 112b through the second output terminal, so that the current generator 112b outputs a second turn-off signal with a current value of zero, and sends the second turn-off signal to the plurality of light-emitting elements 20. Under the action of the second turn-off signal, the plurality of light-emitting elements 20 stop emitting light. Furthermore, the light emission brightness of the light-emitting elements 20 is controlled by the pulse modulation generator 112a and / or the current generator 112b. On the basis of reducing the control delay of the backlight control and providing the freedom of control, the control method of the function control unit 112 is ensured to be simple.

[0038] It should be noted that Figure 6 only the mode switching unit 111 including the logic controller 111b and the mode controller 111a is taken as an example for illustration, but it is not limited thereto. In other embodiments, the mode switching unit 111 may also only include the mode controller 111a, and those skilled in the art can set it according to needs.

[0039] Optionally, in another embodiment, Figure 7 is a schematic diagram of the control function of another display module provided by the embodiments of the present invention. Refer to Figure 7 , the mode switching circuit 110 includes a function control unit 112 and at least one switch unit 113. The switch unit 113 is disposed in the circuit between the output end of the function control unit 112 and the light emitting element 20. The main control chip 01 is connected to the control end of the switch unit 113, and the switch unit 113 is configured to disconnect the output end of the function control unit 112 from the light emitting element 20 according to the first control signal output by the main control chip 01.

[0040] Exemplarily, such as Figure 7In the illustrated embodiment, the mode switching circuit 110 includes a function control unit 112 and at least one switching unit 113. That is, in the embodiment of the present invention, it is not necessary to provide a mode switching unit in the mode switching circuit 110. Instead, the switching unit 113 is directly provided in the circuit between the output terminal of the function control unit 112 and the light-emitting element 20. The switching unit 113 is used to control the conduction and cutoff of the circuit between the output terminal of the function control unit 112 and the light-emitting element 20, so as to control the operating states of the plurality of light-emitting elements 20. Specifically, if it is necessary to turn off the backlight (a plurality of light-emitting elements 20) during operation, the main control chip 01 can directly send a first control signal to the control terminal of the switching unit 113. Under the action of the first control signal, the switching unit 113 disconnects the circuit between the output terminal of the function control unit 112 and the light-emitting element 20. At this time, the modulation signals (pulse modulation signal and current modulation signal) output by the function control unit 112 cannot be transmitted to the plurality of light-emitting elements 20. Therefore, the plurality of light-emitting elements 20 do not emit light. Similarly, if it is necessary to turn on the backlight (a plurality of light-emitting elements 20) subsequently, the main control chip 01 can directly send a second control signal to the control terminal of the switching unit 113. Under the action of the second control signal, the switching unit 113 conducts, so that the circuit between the output terminal of the function control unit 112 and the light-emitting element 20 conducts. At this time, the modulation signals (pulse modulation signal and current modulation signal) output by the function control unit 112 can be normally transmitted to the plurality of light-emitting elements 20. Therefore, the plurality of light-emitting elements 20 start to emit light. In this way, by providing that the mode switching circuit 110 includes the switching unit 113 and controlling the operating states of the plurality of light-emitting elements 20 through the conduction and cutoff of the switching unit 113, while reducing the control delay of the backlight control and providing the freedom of control, the control method of the mode switching circuit 110 is ensured to be simple.

[0041] It should be noted that Figure 7 only one switching unit 113 corresponding to a plurality of light-emitting elements 20 is taken as an example for illustration, but it is not limited thereto. In other embodiments, a plurality of switching units 113 corresponding to a plurality of light-emitting elements 20 can also be provided, and the present invention does not limit this.

[0042] Optionally, on the basis of the above embodiment, Figure 8 is a schematic structural diagram of a switching unit provided by an embodiment of the present invention. Refer to Figure 7 and Figure 8 . The switching unit 113 includes a transistor M and a first resistor R. The gate of the transistor M is respectively connected to the main control chip 01 and the first end of the first resistor R. The source of the transistor M is connected to the output terminal of the function control unit 112. The drain of the transistor M is electrically connected to the light-emitting element 20. The second end of the first resistor R is electrically connected to the ground terminal GND.

[0043] Specifically, the main control chip 01 is electrically connected to the control terminal of the transistor M. Further, under the action of the first control signal of the main control chip 01, the source and drain of the transistor M are turned off, and the plurality of light-emitting elements 20 stop emitting light. Since the transistor M has the characteristics of small size, low power consumption, high speed, and high response frequency, by setting the switching unit 113 to include the transistor M, the control delay of the backlight control can be further reduced. In addition, by setting a first resistor R at the gate of the transistor M to limit the transient current, suppress oscillation, and adjust the switching speed, the stability and response speed of the transistor control are improved.

[0044] Optionally, Figure 9 is a schematic diagram of the control function of another display module provided by an embodiment of the present invention. Refer to Figure 9 , the display module further includes a timing control chip 03. The timing control chip 03 is respectively connected to the backlight driving chip 10 and the main control chip 01. The timing control chip 03 is configured to generate a timing control signal according to the command control signal of the main control chip 01, and send the timing control signal to the backlight driving chip 10, so that the backlight driving chip 10 controls the light-emitting condition of the plurality of light-emitting elements 20 according to the timing control signal.

[0045] Specifically, in the embodiment of the present invention, the functions of the timing control chip 03 and the mode switching circuit 110 are distinguished. Among them, the mode switching circuit 110 is used to control the working state of the plurality of light-emitting elements 20, so as to realize turning off the backlight source (the plurality of light-emitting elements 20) midway, or turning on the backlight source. The timing control chip 03 does not need to implement the function of turning off the backlight source midway, but analyzes the main control instruction of the main control chip 01 to generate a high-precision timing control signal (such as a PWM waveform, a synchronous clock), so as to coordinate the synchronization of the backlight driving and the display panel refreshing timing, and avoid screen tearing or flickering. That is, the timing control chip 03 generates a timing control signal according to the command control signal of the main control chip 01, and sends the timing control signal to the backlight driving chip 10, so that the backlight driving chip 10 controls the light-emitting condition of the plurality of light-emitting elements 20 according to the timing control signal. In this way, by separating the functions of the timing control chip 03 and the mode switching circuit 110, the control of the mode switching circuit 110 is ensured not to be affected by the timing control chip 03 (such as the power-on and power-off stages of the timing control chip 03), and the control freedom is improved.

[0046] Based on the same inventive concept, an embodiment of the present invention further provides a display device. Figure 10 is a schematic structural diagram of a display device provided by an embodiment of the present invention. As Figure 10As shown, the display device includes the display module 100 in the above embodiments. The display device includes the display module 100 of any embodiment of the present invention. Therefore, the display device provided by the embodiments of the present invention has the corresponding beneficial effects of the display module 100 provided by the embodiments of the present invention, which will not be elaborated here. Exemplarily, the display device may be an electronic device such as a mobile phone, a computer, a smart wearable device (e.g., a smart watch), and a vehicle-mounted display device, etc., and the embodiments of the present invention do not limit this.

[0047] Note that the above is only the preferred embodiment of the present invention and the applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here, and various obvious changes, re-adjustments, combinations with each other, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments only. Without departing from the concept of the present invention, it may further include more other equivalent embodiments, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A display module, characterized in that: The display module includes a main control chip and a backlight module; The backlight module includes a backlight driving chip and a plurality of light-emitting elements; The backlight driving chip includes a mode switching circuit; The mode switching circuit is connected to the light-emitting elements and the main control chip respectively, and is used to switch the working states of the multiple light-emitting elements to a first working state according to a first control signal output by the main control chip; in the first working state, the multiple light-emitting elements stop emitting light.

2. The display module according to claim 1, characterized in that: The mode switching circuit includes a mode switching unit and a function control unit; One end of the mode switching unit is connected to the main control chip, and the other end is connected to the function control unit, and the function control unit is connected to the light emitting element; The mode switching unit is used to generate a shutdown modulation signal according to the first control signal of the main control chip, and send the shutdown modulation signal to the function control unit, so that the function control unit outputs a shutdown signal to the light-emitting element according to the shutdown modulation signal.

3. The display module according to claim 2, characterized in that: The mode switching unit includes a mode controller; One end of the mode controller is connected to the main control chip, and the other end is connected to the function control unit; The mode controller is used to generate the shutdown modulation signal according to the first control signal, and send the shutdown modulation signal to the function control unit.

4. The display module according to claim 2, characterized in that: The mode switching unit includes a logic controller and a mode controller; One end of the mode controller is connected to the main control chip, and the other end is connected to the logic controller, and the logic controller is connected to the function control unit; The mode controller is used to generate a function control signal according to the first control signal, and send the function control signal to the logic controller, so that the logic controller generates the shutdown modulation signal according to the function control signal, and sends the shutdown modulation signal to the function control unit.

5. The display module according to claim 2, characterized in that: The function control unit includes a pulse modulation generator and a current generator; The other end of the mode switching unit is connected to at least one of the pulse modulation generator and the current generator; The mode switching unit is used to generate a first shutdown modulation signal according to the first shutdown control signal of the main control chip, and send the first shutdown modulation signal to the pulse modulation generator, so that the pulse modulation generator outputs a first shutdown signal with a duty cycle of zero to the plurality of light-emitting elements according to the first shutdown modulation signal; And / or, the mode switching unit is used to generate a second shutdown modulation signal according to a second shutdown control signal of the main control chip, and send the second shutdown modulation signal to the current generator, so that the current generator outputs a second shutdown signal with a current value of zero to the multiple light-emitting elements according to the second shutdown modulation signal.

6. The display module according to claim 1, characterized in that: The mode switching circuit includes a function control unit and at least one switch unit; The switch unit is arranged in a circuit between the output end of the function control unit and the light emitting element; The main control chip is connected to the control end of the switch unit, and the switch unit is used to control the output end of the function control unit to be disconnected from the light-emitting element according to a first control signal output by the main control chip.

7. The display module according to claim 6, characterized in that: The switch unit includes a transistor and a first resistor; The gate of the transistor is respectively connected to the main control chip and the first end of the first resistor, the source of the transistor is connected to the output end of the function control unit, the drain of the transistor is electrically connected to the light-emitting element, and the second end of the first resistor is electrically connected to the ground end.

8. The display module according to claim 1, characterized in that: The backlight driving chip also includes a control pin; The control pins are electrically connected to the main control chip and the mode switching circuit respectively; The main control chip sends the first control signal to the mode switching circuit through the control pin.

9. The display module according to claim 1, characterized in that: The main control chip and the mode switching circuit are connected via a serial interface communication.

10. The display module according to claim 1, characterized in that: The mode switching circuit is also used to switch the working state of the plurality of light-emitting elements to a second working state according to a second control signal of the main control chip. In the second working state, the plurality of light-emitting elements work normally.

11. The display module according to claim 1, characterized in that: The display module also includes a timing control chip; The timing control chip is connected to the backlight driving chip and the main control chip respectively. The timing control chip is used to generate a timing control signal according to the instruction control signal of the main control chip, and send the timing control signal to the backlight driving chip, so that the backlight driving chip controls the light emission of multiple light-emitting elements according to the timing control signal.

12. A display device, characterized in that: Comprising the display module according to any one of claims 1 to 11; The display module includes a display panel; The display panel is located at the light emitting side of the backlight module; The display panel includes a driving chip, and the driving chip is connected to the main control chip.

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