Driving circuit of display module and display device

Abstract

The invention provides a driving circuit of a display module and a display device, and belongs to the technical field of display. In the driving circuit of the display module, the brightness monitoring module can transmit the brightness monitoring signal reflecting the display brightness of the display module to the driving mainboard, so that the driving mainboard can transmit the display driving signal to the display module based on the brightness monitoring signal under the power supply driving of the power supply; and controlling the display brightness of the display module to be always stabilized within a certain brightness range. Therefore, the bad influence of many factors on the display brightness can be compensated, the stability of the display brightness is ensured to be better, and the display reliability of the display module is ensured to be better.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a driving circuit of a display module and a display device. Background Art

[0002] With the development of science and technology, a large number of electronic products (such as mobile phones) are equipped with display devices to convert electrical signals into intuitive visual information, thereby realizing the visual display of information.

[0003] At present, a display device generally includes: a power supply, a mainboard and a display module. Under the power supply control of the power supply, the mainboard can transmit a light-emitting driving signal (such as a driving current) to the display module to light up the display module so that the display module displays a picture.

[0004] However, affected by many factors (eg, abnormal temperature), the current motherboard cannot drive the display module to emit light stably for a long time, that is, the brightness stability of the current display module is poor and the display reliability is poor. Summary of the invention

[0005] A driving circuit and a display device for a display module are provided, which can solve the problem of poor brightness stability and poor display reliability of the display module in the related art. The technical solution is as follows:

[0006] In one aspect, a driving circuit of a display module is provided, the driving circuit comprising: at least one power supply, a brightness monitoring module and a driving mainboard;

[0007] The at least one power supply is connected to the driving mainboard; the brightness monitoring module is located on one side of the display module and connected to the driving mainboard; the driving mainboard is also connected to the display module;

[0008] Each power supply is used to: provide a power supply voltage to the driving mainboard to power the driving mainboard;

[0009] The brightness monitoring module is used to: monitor the display brightness of the display module, and transmit a brightness monitoring signal reflecting the monitored display brightness to the driving mainboard;

[0010] The driving mainboard is used to: under the drive of the power supply voltage, transmit a display driving signal to the display module based on the brightness monitoring signal to light up the display module and keep the display brightness of the display module within a brightness range.

[0011] Optionally, the driving mainboard is used for:

[0012] When the display brightness reflected by the brightness monitoring signal is outside the brightness range and is greater than the upper limit of the brightness range, the transmitted display driving signal is reduced to reduce the display brightness of the display module;

[0013] When the display brightness reflected by the brightness monitoring signal is outside the brightness range and is less than the lower limit of the brightness range, the transmitted display driving signal is increased to increase the display brightness of the display module.

[0014] Optionally, the brightness range is between 300 and 700 candelas per square meter.

[0015] Optionally, the brightness monitoring module includes: an optical coupling module;

[0016] The sensing end of the optical coupling module is opposite to the light emitting area of ​​the display module, and the output end of the optical coupling module is connected to the driving mainboard.

[0017] Optionally, the at least one power source corresponds to at least one switch socket, and each power source includes: a power filter and a power board;

[0018] One end of the power filter is connected to an external power supply device through a corresponding switch socket, the other end of the power filter is connected to an input end of the power board, and an output end of the power board is connected to the driving main board;

[0019] The power filter is used to filter the initial voltage provided by the external power supply device and transmit it to the power board;

[0020] The power board is used to convert the received initial voltage into the power supply voltage required by the driving mainboard; wherein the power supply voltage is lower than the initial voltage.

[0021] Optionally, the driving circuit includes: two power supplies.

[0022] Optionally, the two power supplies are symmetrically arranged in the first direction about a symmetry axis extending in the second direction, and the two power supplies and the driving mainboard are arranged in sequence in the second direction; wherein the first direction intersects with the second direction.

[0023] Optionally, the display module comprises: a display panel and a backlight module, wherein the backlight module is used to provide backlight for the display panel;

[0024] The brightness monitoring module is located at one side of the backlight module and is used to monitor the display brightness of the backlight module;

[0025] The driving mainboard is connected to the backlight module and is used to transmit a display driving signal to the backlight module based on the brightness monitoring signal to light up the backlight module.

[0026] In another aspect, a display device is provided, the display device comprising: a display module, and a driving circuit of the display module as described in the above aspect;

[0027] Wherein, the driving circuit is connected to the display module and is used to drive the display module to display.

[0028] Optionally, the display device is an aviation monitor.

[0029] In summary, the beneficial effects brought about by the technical solution provided by the embodiments of the present application may at least include:

[0030] Provided are a driving circuit and a display device for a display module, belonging to the field of display technology. In the driving circuit of the display module, a brightness monitoring module can transmit a brightness monitoring signal reflecting the display brightness of the display module to a driving mainboard, so that the driving mainboard can transmit a display driving signal to the display module based on the brightness monitoring signal under the power supply drive of a power supply, and control the display brightness of the display module to always be stable within a certain brightness range. Therefore, the adverse effects of many factors on the display brightness can be compensated, ensuring that the stability of the display brightness is good, and further ensuring that the display reliability of the display module is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 It is a structural schematic diagram of a display module and a driving circuit thereof provided in an embodiment of the present application;

[0033] Figure 2 is a structural schematic diagram of another display module and a driving circuit thereof provided in an embodiment of the present application;

[0034] Figure 3 is a schematic diagram of a circuit layout of a display module provided in an embodiment of the present application;

[0035] Figure 4 It is a schematic diagram of a circuit layout of a display module provided in an embodiment of the present application;

[0036] Figure 5This is a schematic diagram of the peripheral circuit structure of an optical coupling module provided in an embodiment of the present application;

[0037] Figure 6 is a schematic diagram of a spectrum curve of an optical coupling module provided in an embodiment of the present application;

[0038] Figure 7 This is a control logic diagram of a driving mainboard provided in an embodiment of the present application;

[0039] Figure 8 is a structural schematic diagram of a display device provided in an embodiment of the present application;

[0040] Fig. 9 It is a schematic diagram of the structure of another display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0042] In addition to common electronic products such as mobile phones and computers, there is also a category of electronic products used in the aviation field that are also equipped with display devices to achieve visual display of information. For example, aviation monitors. Since this use scenario in the aviation field is relatively niche and the update iteration is relatively slow, but the long-term stability of display brightness and display reliability are required to be high, the existing display devices cannot meet this demand, so there is an urgent need to provide a display device with good display brightness stability and high display reliability.

[0043] Based on this, the embodiment of the present application provides a new display device, in which the driving circuit can drive the display module to display reliably, so that the stability of the display brightness is better.

[0044] Figure 1 A driving circuit of a display module provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the driving circuit 00 includes: at least one power supply 01, a brightness monitoring module 02 and a driving mainboard 03.

[0045] At least one power supply 01 is connected to the driving mainboard 03. The brightness monitoring module 02 is located at one side of the display module 10 and is connected to the driving mainboard 03. The driving mainboard 03 is also connected to the display module 10.

[0046] It is understandable that, combined with Figure 1 The brightness monitoring module 02 being located at one side of the display module 10 may mean that the brightness monitoring module 02 is arranged opposite to the display area of ​​the display module 10 to reliably monitor the display brightness of the display module 10 . Figure 1The connection between the brightness monitoring module 02 and the display module 10 indicates that the display areas of the brightness monitoring module 02 and the display module 10 are arranged relative to each other, but does not mean that there is a wired connection between the two.

[0047] Each power supply 01 is used to provide a power supply voltage to the driver mainboard 03 to supply power to the driver mainboard 03 .

[0048] For example, each power supply 01 can be connected to an external power supply device through a switch socket, and is used to convert the initial voltage provided by the external power supply device through the switch socket into the power supply voltage required by the driving mainboard 03, so as to reliably supply power to the driving mainboard 03.

[0049] Optionally, the external power supply device may be, for example, a power plug capable of providing 220 volt (V) AC power, which may be inserted into a switch socket to provide 220V AC power to each power supply 01. Then, each power supply 01 may convert the 220V AC power into 5V and / or 12V DC power required by the driving mainboard 03 to power the driving mainboard 03. The voltages here are all schematic illustrations.

[0050] The brightness monitoring module 02 is used to monitor the display brightness of the display module 10 and transmit a brightness monitoring signal reflecting the monitored display brightness to the driving mainboard 03 .

[0051] For example, the brightness monitoring module 02 can monitor the display brightness of the display module 10 in real time or periodically, and can convert the display brightness into a corresponding electrical signal and feed it back to the driving motherboard 03, so that the driving motherboard 03 can obtain the display brightness of the display module 10. Of course, the brightness monitoring module 02 can also monitor the display brightness of the display module 10 in response to the monitoring instruction transmitted by the driving motherboard 03. The embodiment of the present application does not limit the monitoring timing.

[0052] The driving mainboard 03 is used to: under the drive of the power supply voltage, transmit a display driving signal to the display module 10 based on the brightness monitoring signal to light up the display module 10 and keep the display brightness of the display module 10 within the brightness range.

[0053] For example, the driver motherboard 03 can work under the drive of the power supply voltage, and can flexibly provide the required display driving signal or the adjusted output display driving signal to the display module 10 based on the real-time display brightness of the display module 10 reflected by the brightness monitoring signal, so that the display brightness of the display module 10 can always be stably maintained within a certain brightness range, compensating for the fluctuation of the display brightness caused by changes in ambient temperature or the passage of time, ensuring better stability of the display brightness, and thus ensuring better display reliability.

[0054] Optionally, the display driving signal may be, for example, a driving current. The brightness range may be a fixed value pre-set in the driving mainboard 03 or may be flexibly adjusted according to actual conditions. For display devices in different scenarios, the brightness range may be different.

[0055] In summary, the embodiment of the present application provides a driving circuit of a display module. Since in the driving circuit of the display module, the brightness monitoring module can transmit a brightness monitoring signal reflecting the display brightness of the display module to the driving mainboard, the driving mainboard can transmit a display driving signal to the display module based on the brightness monitoring signal under the power supply drive of the power supply, and control the display brightness of the display module to always be stable within a certain brightness range. Therefore, it is possible to compensate for the adverse effects of many factors on the display brightness, ensure the stability of the display brightness, and further ensure the display reliability of the display module.

[0056] Optionally, in Figure 1 Based on this, continue to refer to Figure 2 It can be seen that the display module 10 may include: a display panel and a backlight module. The backlight module can provide backlight to the display panel, so that the display panel displays the picture. Figure 2 The backlight module is only schematically shown, and the backlight module shown is a 28-inch module (referred to as 28 module) commonly used in aviation monitors, and the backlight module shown includes two parallel light boards as shown in the figure, and each light board may include a plurality of light-emitting elements, and the light-emitting elements may be light-emitting diodes (LEDs). Of course, the module size and the number of light boards here are only schematic illustrations.

[0057] The brightness monitoring module 02 may be located at one side of the backlight module and used to monitor the display brightness of the backlight module. Here, it may refer to that the brightness monitoring module 02 monitors the luminous brightness of the light board of the backlight module.

[0058] The driving mainboard 03 is connected to the backlight module and is used to transmit a display driving signal to the backlight module based on the brightness monitoring signal to light up the backlight module. Here, the driving mainboard 03 can be connected to the light board in the backlight module to output a driving current to the light board, thereby lighting up the light board and making the display module emit light.

[0059] That is, the display module provided in the embodiment of the present application may refer to a backlight module that provides backlight, which is often used in the aviation monitor described above.

[0060] Optionally, continue to refer to Figure 2It can be seen that at least one power supply 01 can correspond to at least one switch socket. That is, each power supply 01 can be connected to an external power supply device via a corresponding switch socket, and different power supplies 01 can be connected to an external power supply device via different switches sockets. Accordingly, the number of switches sockets required for the whole machine (here refers to the display device) and the number of power supplies 01 required to be set can be the same. Each switch socket can be, for example, a three-hole socket with a switch.

[0061] Optionally, continue to refer to Figure 2 It can be seen that each power supply 01 may include: a power filter 011 and a power board 012 .

[0062] One end of the power filter 011 can be connected to an external power supply device through a corresponding switch socket, and the other end of the power filter 011 can be connected to the input end of the power board 012, and the output end of the power board 012 can be connected to the driving main board 03. It can be understood that the output end of the power board 012 can be connected to the power end of the driving main board 03 to reliably output the required power supply voltage to the driving main board 03 and supply power to the driving main board 03.

[0063] The power filter 011 can be used to filter the initial voltage provided by the external power supply device and transmit it to the power board 012. In this way, the noise and interference that may affect sensitive devices can be reduced or eliminated, and the electromagnetic compatibility can be improved to meet the magnetic compatibility standard to ensure that only the required valid signals are transmitted in the device.

[0064] The power board 012 can be used to convert the received initial voltage into the power supply voltage required by the driving main board 03 .

[0065] Among them, the supply voltage is less than the initial voltage. For example, combining the above records and Figure 2 , the external power supply device can be a power plug that can provide 220V AC power. The power filter 011 in each power supply 01 is connected to the power plug through a corresponding switch socket. The power filter 011 can filter the 220V AC power. The power board 012 can convert the initial voltage after filtering into the 5V and 12V power supply voltages required by the driving mainboard 03, and output it to the power supply terminal of the driving mainboard 03 to power the driving mainboard 03.

[0066] Optionally, continue to refer to Figure 2 It can also be seen that the driving circuit 00 described in the embodiment of the present application may include: two power supplies 01. Accordingly, the two power supplies 01 can be connected to an external power supply device via two different switch sockets. This can also be considered that the whole machine adopts a built-in dual power supply.

[0067] It can be understood that on the basis of setting up multiple power supplies 01, a redundant built-in power supply can be selected through the corresponding switch socket, so that in the event of a failure of one power supply 01, another power supply 01 can be used for power supply, thereby ensuring that the driver motherboard 03 can always work reliably, and then reliably drive the display module 10 to display, further ensuring that the display reliability of the entire machine is good.

[0068] Optionally, Figure 3 The figure schematically shows the layout of a power supply and a driving mainboard in a complete machine. Figure 4 A schematic diagram of the layout is shown. Figure 3 and Figure 4 It can be seen that the two power supplies 01 can be symmetrically arranged in the first direction X1 about the symmetry axis L1 extending along the second direction X2, and the two power supplies 01 and the driving mainboard 03 can be arranged in sequence in the second direction X2.

[0069] The first direction X1 intersects with the second direction X2. Figure 3 and Figure 4 The first direction X1 and the second direction X2 are shown to be perpendicular to each other.

[0070] It is understandable that, combined with Figure 4 The two power supplies 01 are symmetrically arranged about the symmetry axis L1, which may refer to the power supply boards 012 in the two power supplies 01 being symmetrically arranged about the symmetry axis L1. Figure 4 It can also be seen that the switch socket can also be symmetrically arranged about the symmetry axis L1. And the power filter 011 in the two-way power supply 01 can also be symmetrically arranged about the symmetry axis extending in the first direction X1 in the second direction X2. In this way, it is easy to wire and facilitate integrated layout, making the whole machine compact and small in size.

[0071] Optionally, continue to refer to Figure 2 It can be seen that the brightness monitoring module 02 may include: an optical coupling module.

[0072] Optionally, Figure 5 The following is a schematic diagram showing the structure of a peripheral circuit of an optical coupling module. Figure 2 and Figure 5 It can be seen that the sensing end of the optical coupling module can be opposite to the light-emitting area of ​​the display module 10 (such as the light-emitting area of ​​the light board in the backlight module), and the output end of the optical coupling module can be connected to the driving mainboard 03.

[0073] Optionally, refer to Figure 5 It can also be seen that the driving mainboard 03 may include a microcontroller unit (MCU).

[0074] Figure 5 In, V DD Refers to digital or analog power supply, R0 is the V DD The pull-up resistor R0 has a resistance of about 200 ohms (Ω). DD It is mainly used to power components and can be used as a pin of a power supply. C1 and C2 are capacitors to ground (GND), and the capacitance of each capacitor to ground is about 0.1 microfarads. SDA refers to I2C serial signal data, which adopts an open-drain structure. SCL refers to an I2C serial clock signal, which adopts an open-drain structure. R1 and R2 are pull-up resistors at the output ends of the output SDA and SCL, and the resistance of the pull-up resistor R1 or R2 is about 5.1 kilo-ohms (KΩ). Of course, the values ​​here are all schematic illustrations. In combination with this part of the record, it can be seen that in an embodiment of the present application, the optical coupling module can transmit the sampled display brightness in the form of an I2C signal to the MCU included in the driving mainboard 03, so that the MCU can determine whether the current display brightness is within the brightness range based on the signal. Of course, other signal forms can also be used for transmission. For example, a serial peripheral interface signal (serial peripheral interface, SPI) signal.

[0075] Optionally, the brightness range may be between 300 and 700 candelas per square meter (cd / m 2 ). It is understandable that due to 1cd / m 2 =1 nit, so the brightness range can also be between 300nit and 700nit.

[0076] For example, taking the brightness monitoring module 02 as an optical coupler module, Figure 6 A spectrum intensity curve is schematically shown. The horizontal axis refers to the wavelength (Wavelength), the unit is nanometer (nm), ranging from 400nm to 1000nm, representing the wavelength range of different colors of light. The vertical axis refers to the relative intensity (Relative Intensity), the value range is from 0 to 1.0, indicating the relative intensity at a specific wavelength. And Figure 6 Two curves "SDF-DALS-Z" and "Human Eye" are shown schematically. The "SDF-DALS-Z" curve represents the relative intensity distribution of the SDF-DALS-Z material or system at different wavelengths, with its intensity reaching a peak at about 500-550nm and decreasing on both sides. The "Human Eye" curve represents the relative response intensity of the human eye to light of different wavelengths, reaching a peak at about 550nm, indicating that the human eye is most sensitive to light near this wavelength, and the response intensity gradually decreases on both sides. That is, combined with Figure 6 It can be seen that at 550cd / m 2The response of the optocoupler module is most obvious, so the brightness value of the whole machine can be set to 550cd / m 2 The driver motherboard 03 can control the display brightness of the display module 10 to be stable at 550cd / m 2 Place.

[0077] Thus, in one embodiment of the present application, a fixed value (e.g., 550 cd / m 2 ). Moreover, when the brightness monitoring module 02 detects that the actual brightness value of the display module 10 is less than 550 cd / m 2 The driving motherboard 03 can increase the actual brightness of the display module 10 by increasing the transmitted display driving signal, so that the actual brightness value can reach 550cd / m 2 When the brightness monitoring module 02 detects that the actual brightness value of the display module 10 is greater than 550cd / m 2 The driver motherboard 03 can reduce the actual brightness of the display module 10 by reducing the transmitted display drive signal, so that the actual brightness value can reach 550cd / m 2 .

[0078] Of course, in another embodiment of the present application, the driving mainboard 03 can be used for:

[0079] When the display brightness reflected by the brightness monitoring signal is outside the brightness range and is greater than the upper limit of the brightness range, the transmitted display driving signal is adjusted down to reduce the display brightness of the display module 10 .

[0080] When the display brightness reflected by the brightness monitoring signal is outside the brightness range and is less than the lower limit of the brightness range, the transmitted display driving signal is increased to increase the display brightness of the display module 10 .

[0081] That is, a brightness range can be pre-set in the driver motherboard 03. And when the brightness monitoring module 02 detects that the actual brightness value of the display module 10 is not within the brightness range, and is less than the lower limit of the brightness range, the actual brightness of the display module 10 can be increased by increasing the transmitted display drive signal, so that the actual brightness value can be within the brightness range. When the brightness monitoring module 02 detects that the actual brightness value of the display module 10 is not within the brightness range, and is greater than the upper limit of the brightness range, the actual brightness of the display module 10 can be reduced by reducing the transmitted display drive signal, so that the actual brightness value can be within the brightness range. And, the brightness range can be, for example, between 300 and 700 cd / m 2 Thus, when the brightness monitoring module 02 detects that the display brightness is lower than 300cd / m 2, the driving main board 03 can increase the display driving signal transmitted to the display module 10 at the previous moment, so as to increase the display brightness to be greater than 300 cd / m 2 , such as increasing it to about 550 cd / m 2 . When the brightness monitoring module 02 monitors that the display brightness is greater than 300 cd / m 2 , the driving main board 03 can decrease the display driving signal transmitted to the display module 10 at the previous moment, so as to decrease the display brightness to be less than 700 cd / m 2 , such as decreasing it to about 550 cd / m 2 .

[0082] It can be understood that the driving main board 03 is generally used to transmit a pulse width modulation (PWM) signal to the display module 10 to drive the display module 10 to display. For example, taking the display module 10 as the light board in the backlight module, and taking the LEDs included in the light board driven by the driving main board 03 as an example, the driving main board 03 can transmit a PWM signal to control the current flowing through the LEDs, so as to drive the LEDs to emit light and control the light-emitting brightness of the LEDs. Correspondingly, in the embodiment of the present application, the driving main board 03 can flexibly adjust the display brightness of the display module 10 by adjusting the PWM signal (also called LED current PWM) for controlling the LED current magnitude. That is to say, the above-mentioned adjusted display driving signal can be a PWM signal. And, what the driving main board 03 adjusts can be the duty cycle or the amplitude of the PWM signal. Moreover, increasing the duty cycle or the amplitude can correspondingly increase the brightness; decreasing the duty cycle or the amplitude can correspondingly decrease the brightness.

[0083] In this way, combined with Figure 7 , taking the display module 10 as the light board in the backlight module, and taking the light board including LEDs as an example, assuming that the set constant brightness parameter a of the user is 550 nit, then the set value in the driving main board 03 is 550 nit. The actual brightness value b of the display module is a fluctuating value. That is to say, a is the ideal brightness value and b is the actual brightness value. Then when a < b, that is, when the actual brightness value is greater than the ideal brightness value, the driving main board 03 can reduce the LED current PWM by 1% to reduce the light-emitting brightness of the light board; when a > b, that is, when the actual brightness value is less than the ideal brightness value, the driving main board 03 can increase the LED current PWM by 1% to increase the light-emitting brightness of the light board; and when a = b, that is, when the actual brightness value is equal to the ideal brightness value, the LED current PWM can remain unchanged, that is, the light-emitting brightness of the light board can remain unchanged. In this way, it can ensure that the display brightness of the display module is always stable at about the ideal brightness value of 550 nit, ensuring good brightness stability. In addition, Figure 7In the illustrated method, the detection frequency may be 1 time / second, that is, in seconds, and the display brightness of the display module 10 is monitored once per second by the brightness monitoring module. Of course, it is not limited thereto.

[0084] Combined with the foregoing records, it can be known that the embodiment of the present application provides a display module with stable display and high display reliability, which can be applied to aviation monitors with backlight modules that have high requirements for this. Among them, on the one hand, it is mainly to cooperate with the optical coupling module on the backlight module in the display module to monitor the backlight brightness, and to feed back to the driver mainboard, so that the driver mainboard can flexibly adjust the driving current transmitted to the backlight module, so that the backlight brightness is stabilized within a certain brightness range, and compensate for the brightness fluctuations caused by ambient temperature changes and the passage of time, so as to ensure that the whole machine maintains a stable brightness level throughout its life cycle. On the other hand, it mainly adopts a built-in dual power supply to provide a clean and easy-to-manage area, so as to flexibly select redundant built-in power supplies to ensure the high reliability of the whole machine. Of course, in some embodiments, the optical coupling module can also be replaced by other modules such as cameras to monitor the brightness. The built-in dual power supply can also be replaced by a built-in three power supplies or even more power supplies.

[0085] In summary, the embodiment of the present application provides a driving circuit of a display module. Since in the driving circuit of the display module, the brightness monitoring module can transmit a brightness monitoring signal reflecting the display brightness of the display module to the driving mainboard, the driving mainboard can transmit a display driving signal to the display module based on the brightness monitoring signal under the power supply drive of the power supply, and control the display brightness of the display module to always be stable within a certain brightness range. Therefore, it is possible to compensate for the adverse effects of many factors on the display brightness, ensure the stability of the display brightness, and further ensure the display reliability of the display module.

[0086] The present application also provides a display device. Figure 8 As shown, the display device includes: a display module 10, and a driving circuit 00 of the display module as described above.

[0087] The driving circuit 00 is connected to the display module 10 and is used to drive the display module 10 to display.

[0088] Optionally, the display device may be a product or component with a display function such as a liquid crystal display device. Furthermore, the display device may also be any appropriate display device, including but not limited to a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, and an e-book. For example, the display device may be Fig. 9 The aviation monitor shown is used in the aviation field.

[0089] It can be understood that since the display device can have basically the same technical effects as the driving circuit of the display module described in the above embodiments, for the purpose of brevity, the technical effects of the display device will not be repeatedly described here.

[0090] It should be noted that the terms used in the embodiments of this application are only used to explain the embodiments of this application and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in the embodiments of this application should be the common meanings understood by people with general skills in the field to which this application belongs.

[0091] For example, the words "first", "second", "third" and similar words used in the patent application specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not indicate a quantity limitation, but indicate the existence of at least one. Words such as "include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. "And / or" means that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0092] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A driving circuit of a display module, characterized in that: The driving circuit comprises: at least one power supply, a brightness monitoring module and a driving mainboard; The at least one power supply is connected to the driving mainboard; the brightness monitoring module is located on one side of the display module and connected to the driving mainboard; the driving mainboard is also connected to the display module; Each power supply is used to: provide a power supply voltage to the driving mainboard to power the driving mainboard; The brightness monitoring module is used to: monitor the display brightness of the display module, and transmit a brightness monitoring signal reflecting the monitored display brightness to the driving mainboard; The driving mainboard is used to: under the drive of the power supply voltage, transmit a display driving signal to the display module based on the brightness monitoring signal to light up the display module and keep the display brightness of the display module within a brightness range.

2. The driving circuit according to claim 1, characterized in that: The driver mainboard is used for: When the display brightness reflected by the brightness monitoring signal is outside the brightness range and is greater than the upper limit of the brightness range, the transmitted display driving signal is reduced to reduce the display brightness of the display module; When the display brightness reflected by the brightness monitoring signal is outside the brightness range and is less than the lower limit of the brightness range, the transmitted display driving signal is increased to increase the display brightness of the display module.

3. The driving circuit according to claim 1, characterized in that: The brightness range is between 300 and 700 candelas per square meter.

4. The driving circuit according to any one of claims 1 to 3, characterized in that: The brightness monitoring module includes: an optical coupling module; The sensing end of the optical coupling module is opposite to the light emitting area of ​​the display module, and the output end of the optical coupling module is connected to the driving mainboard.

5. The driving circuit according to any one of claims 1 to 3, characterized in that: The at least one power source corresponds to at least one switch socket, and each power source includes: a power filter and a power board; One end of the power filter is connected to an external power supply device through a corresponding switch socket, the other end of the power filter is connected to an input end of the power board, and an output end of the power board is connected to the driving main board; The power filter is used to filter the initial voltage provided by the external power supply device and transmit it to the power board; The power board is used to convert the received initial voltage into the power supply voltage required by the driving mainboard; wherein the power supply voltage is lower than the initial voltage.

6. The driving circuit according to any one of claims 1 to 3, characterized in that: The driving circuit includes: two power supplies.

7. The driving circuit according to claim 6, characterized in that: The two power supplies are symmetrically arranged in the first direction about a symmetry axis extending in the second direction, and the two power supplies and the driving mainboard are arranged in sequence in the second direction; wherein the first direction intersects with the second direction.

8. The driving circuit according to any one of claims 1 to 3, characterized in that: The display module comprises: a display panel and a backlight module, wherein the backlight module is used to provide backlight for the display panel; The brightness monitoring module is located at one side of the backlight module and is used to monitor the display brightness of the backlight module; The driving mainboard is connected to the backlight module and is used to transmit a display driving signal to the backlight module based on the brightness monitoring signal to light up the backlight module.

9. A display device, characterized in that: The display device comprises: a display module, and a driving circuit of the display module according to any one of claims 1 to 8; Wherein, the driving circuit is connected to the display module and is used to drive the display module to display.

10. The display device according to claim 9, characterized in that: The display device is an aviation monitor.

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