Liquid crystal module and backlight brightness control method thereof

Abstract

The present invention provides a liquid crystal module and a backlight brightness control method thereof, comprising at least one control unit and at least one group of backlight light source components, wherein the control unit and the backlight light source components are connected in pairs, wherein the control unit comprises: an ambient light collection module, for collecting the light intensity of the external ambient light and converting it into an electrical signal; a brightness adjustment module, for receiving the electrical signal from the ambient light collection module, and generating a control signal based at least on the electrical signal and a preset signal value, wherein the backlight light source component comprises a plurality of light-emitting elements, for receiving the control signal from the corresponding brightness adjustment module, and entering a corresponding working state according to the control signal, wherein the working state comprises: a first working state in which all light-emitting elements emit light at full power, a second working state in which all light-emitting elements do not emit light, and a third working state in which light-emitting elements emit light at partial power. The present invention effectively reduces the power consumption of the highlight module when used in a low-brightness state, and increases the service life of the backlight light source.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal display, and in particular to a liquid crystal module capable of both ultra-high brightness display and ultra-low brightness display and a backlight brightness control method thereof. Background Art

[0002] Liquid crystal is an organic polymer material with properties between liquid and crystal. It has both the fluidity of liquid and the orderliness of crystal structure arrangement. Liquid crystal is a crystal structure at low temperature, becomes liquid at high temperature, and exists in the form of liquid crystal at intermediate temperature. With the rapid development of science and technology, people are more and more interested in the research and development of liquid crystal materials. The demand for liquid crystal displays in the world market is also increasing. Now more and more liquid crystal displays and LCD TVs have entered daily office and life.

[0003] At present, the display modules on the market can display high brightness up to 1200cd / ㎡ or even up to 1500cd / ㎡. These display modules control the display brightness by adaptive or manual means. However, in the prior art, for display modules with a maximum brightness of more than 600cd / ㎡, if a requirement is put forward to enable them to adapt to ambient light conditions and stably display image information at a brightness of less than 50cd / ㎡, the display module will have unacceptable defects such as screen flickering and severe uneven brightness.

[0004] Therefore, there is a need for a liquid crystal display module that can display in a stable state at high brightness and in a stable state at ultra-low brightness in a dark field. Summary of the invention

[0005] The embodiments of the present invention provide a liquid crystal module with adjustable brightness, which is used to solve at least the problems described above: 1) the existing technology can only ensure the steady-state display of the display within a certain brightness range, but cannot take into account the steady-state display of ultra-bright display and ultra-low brightness; 2) it is difficult for the existing technology to achieve a surface brightness of a black screen image lower than 0.1cd / m in a dark field environment 2 problem.

[0006] In one aspect, the present invention provides a liquid crystal module, comprising a control device and a light emitting device, wherein the control device comprises at least one control unit, and the light emitting device comprises at least one group of backlight light source components, wherein the control unit and the backlight light source components are connected in pairs.

[0007] The control unit comprises:

[0008] An ambient light collection module is used to collect the light intensity of the external ambient light and convert it into an electrical signal;

[0009] a brightness adjustment module, configured to receive the electrical signal from the ambient light collection module and generate a control signal based at least on the electrical signal and a preset signal value,

[0010] The control device further includes an additional control unit, which includes an additional brightness adjustment module, and the additional brightness adjustment module is connected to one of the ambient light collection modules; the light emitting device further includes a group of additional backlight light source components, and the additional control unit is connected to the additional backlight light source components.

[0011] The backlight light source assembly and the additional backlight light source assembly include a plurality of light emitting elements, which are used to receive control signals from corresponding brightness adjustment modules and enter corresponding working states according to the control signals.

[0012] The working states include: a first working state in which all light-emitting elements emit light at full power, a second working state in which all light-emitting elements do not emit light, and a third working state in which light-emitting elements emit light at partial power.

[0013] The liquid crystal module provided by the present invention can be adjusted according to the intensity of the ambient light to display the corresponding brightness. In this way, the user can adapt to the surrounding brightness at any time when using it, meet the adaptive photosensitivity requirements, and also play a corresponding protective role on the user's eyesight. In addition, by providing an additional control unit and an additional backlight source assembly, the present invention can display high brightness in a brighter environment, and at the same time, can display ultra-low brightness in a darker environment in a simple and convenient way without other additional measures. Since the working state of the light-emitting element in the backlight source module includes emitting light at partial power, its low-brightness display can also be performed within the corresponding numerical range, rather than only being displayed according to a preset brightness value.

[0014] In some embodiments, the brightness adjustment module includes a power adjustment component and a switch. The electrical signal and the preset signal value generate a switch operation signal after passing through the power adjustment component. The brightness adjustment module is used to control the conduction state of the switch based on the switch operation signal and generate the control signal.

[0015] In some embodiments, the power adjustment component includes an operational amplifier.

[0016] In some embodiments, the preset signal value in each control unit is different, and the preset signal value in each control unit is associated with the turn-on voltage value of the switch in the control unit, so that:

[0017] When the switch operation signal value is less than the switch conduction voltage value, the power supply of the corresponding backlight light source assembly is cut off, thereby being in the second working state;

[0018] When the switch operation signal value is greater than the switch on voltage value and less than the threshold voltage value, the corresponding backlight light source assembly is in the third working state;

[0019] When the switch operation signal value is greater than the threshold voltage value of the switch, the corresponding backlight light source assembly is in the first working state.

[0020] In the above-mentioned liquid crystal module, the ambient light collection signal is used to simultaneously control two or even multiple light-emitting devices; further, multiple light-emitting devices can be controlled in stages by the same signal.

[0021] In some embodiments, the switch is a MOS tube.

[0022] In some embodiments, the additional brightness adjustment module includes a signal amplifier.

[0023] In some embodiments, the control device includes a control unit and an additional control unit, and the lighting device includes a group of backlight light source components and a group of additional backlight light source components.

[0024] In some embodiments, the light emitting elements in the at least one group of backlight light source assemblies and the additional backlight light source assemblies are of the same type.

[0025] In some embodiments, the ratio of the number of light emitting elements in the backlight light source assembly and the additional backlight light source assembly is greater than 1:1.

[0026] In some embodiments, the ratio of the number of light emitting elements in the backlight light source assembly and the additional backlight light source assembly is 2:1.

[0027] In some embodiments, the acquisition module includes a photoresistor.

[0028] In some embodiments, the control device includes more than two control units, and the light emitting device includes more than two groups of backlight light source components. The conduction voltage of the power adjustment component in each control unit is different. Preferably, when the photoresistor is connected to the positive terminal of the power supply and to the positive terminal of the power adjustment component, the additional brightness adjustment device in the additional control unit is connected to the ambient light collection module in the control unit where the power adjustment component with the smallest conduction voltage is located.

[0029] Another aspect of the present invention provides a method for controlling backlight brightness of a liquid crystal module, wherein the liquid crystal module includes a backlight light source assembly and an additional backlight light source assembly, and the method includes:

[0030] Collect the light intensity of external ambient light and convert it into electrical signals;

[0031] receiving the electrical signal, and generating a control signal based at least on the electrical signal and a preset signal value;

[0032] receiving the control signal, and entering a corresponding working state according to the control signal;

[0033] The working states of the backlight light source assembly and the additional backlight light source assembly include: a first working state in which all light emitting elements emit light at full power, a second working state in which all light emitting elements do not emit light, and a third working state in which light emitting elements emit light at partial power.

[0034] In some embodiments, the electrical signal and the preset signal value generate a switch operation signal after passing through a power adjustment component, and the control signal is generated based on the switch operation signal.

[0035] In some embodiments, when the switch operation signal value is less than the switch on voltage value, the power supply of the corresponding backlight light source assembly is cut off, thereby being in the second working state;

[0036] When the switch operation signal value is greater than the switch on voltage value and less than the threshold voltage value, the corresponding backlight light source assembly is in the third working state;

[0037] When the switch operation signal value is greater than the threshold voltage value of the switch, the corresponding backlight light source assembly is in the first working state.

[0038] The present invention effectively reduces the power consumption of the high-brightness module when used in a low-brightness state, and increases the service life of the backlight source. At the same time, the present invention improves the brightness adaptability of the product, the increased cost of product manufacturing is small, and the manufacturing process difficulty is not increased, so the reliability of the product can be ensured to remain unchanged. In addition, the liquid crystal module manufactured according to the present invention will not cause new environmental pollution problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 A schematic diagram of the logical structure of a liquid crystal module according to an embodiment of the present invention;

[0041] Figure 2 A circuit schematic diagram of a control device for a liquid crystal module according to an embodiment of the present invention;

[0042] Figure 3 A circuit schematic diagram of a light emitting device of a liquid crystal module according to an embodiment of the present invention;

[0043] Figure 4 A circuit schematic diagram of a light emitting device of a liquid crystal module according to another embodiment of the present invention;

[0044] Figure 5 A circuit schematic diagram of a control device for a liquid crystal module according to another embodiment of the present invention;

[0045] Figure 6 The flowchart is a backlight brightness control method of a liquid crystal module according to an embodiment of the present invention. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0048] It should also be noted that, in this article, relational terms such as "first" and "second", "additional", etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include" and "comprise" include not only those elements, but also other elements not explicitly listed, or also include elements inherent to such processes, methods, articles or equipment. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the existence of other identical elements in the process, method, article or equipment that includes the elements.

[0049] like Figure 1 As shown, according to a schematic diagram of an embodiment of a liquid crystal module of the present invention, the liquid crystal module includes a control device 10 and a light emitting device 20. The control device 10 includes a plurality of control units 11 and an additional control unit 12, and the light emitting device includes n groups of backlight light source components L1, L2...Ln and a group of additional backlight light source components L0, wherein n is greater than or equal to 1 and is an integer. The control unit 11 includes an ambient light collection module 111 and a brightness adjustment module 112. Among them:

[0050] The ambient light collection module 111 is used to collect the light intensity of the external ambient light and convert it into a corresponding electrical signal;

[0051] The brightness adjustment module 112 is used to receive the electrical signal from the ambient light collection module 111, and generate a control signal based on the electrical signal and a preset signal value;

[0052] The backlight light source components L1, L2, ..., Ln are used to receive the control signal from the brightness adjustment device 112 and determine their own working state according to the control signal;

[0053] The additional control unit 12 includes an additional brightness adjustment module 121 , the input end of which is connected to the output end of one of the ambient light collection modules 111 . The input end of the additional backlight source assembly L0 is connected to the output end of the additional brightness adjustment module 121 .

[0054] The above-mentioned working states include: a first working state in which all the light-emitting elements in the backlight light source assembly (including the additional backlight light source assembly) emit light, a second working state in which all the light-emitting elements in the backlight light source assembly do not emit light, and a third working state in which some of the light-emitting elements in the backlight light source assembly emit light.

[0055] The present invention is further described below through specific examples.

[0056] Figure 2 and Figure 3 The circuit diagrams of the control device and the light-emitting device of the liquid crystal module according to one embodiment of the present invention are shown respectively. It should be noted that the connecting wires between the devices are represented by solid lines in the circuit diagram. There is a dot at the intersection of two wires, indicating that the two wires are connected together; there is no dot at the intersection of two wires, or one of the lines is changed from a straight line to an arc line, indicating that the two wires are not connected.

[0057] In this example, the number of the control unit is one, and accordingly, the number of the backlight light source assembly is also one group. Hereinafter, for the sake of clarity, the backlight light source assembly is referred to as light group 1, and the additional backlight light source assembly is referred to as light group 2.

[0058] like Figure 2 As shown, in this example, the liquid crystal module is connected to the photoresistor R L Collect the light intensity of the ambient light. In the control unit corresponding to lamp group 1, the photoresistor R L The photoresistor R1 is connected in series with the preset resistor R1, and the resistor R1 is grounded. L The resistor R1 is connected in parallel with the series-connected preset resistors R2 and R3.

[0059] Photoresistor R LThe common end of the operational amplifier U1 and the preset resistor R1 are simultaneously connected to the signal input ends of the operational amplifiers U1 and U2. The other input end of the operational amplifier U1 is connected to the common end of the resistors R2 and R3. In addition, the preset resistors R5 and R6 are connected in series, and the series resistors R5 and R6 are connected in parallel with the resistor R3. The output end of the operational amplifier U1 is connected to the switch circuit Q1 and to the grounded resistor R4. In this example, the switch circuit is a power MOS tube.

[0060] Photoresistor R L The light intensity of the collected ambient light is output as a voltage value. After the voltage value and the voltage across the preset resistor R2 are calculated by the operational amplifier U1, if the output signal (for convenience, referred to as the "switch operation signal") is greater than the on-voltage of the switch circuit Q1, the MOS tube Q1 is turned on, and the current flows through the MOS tube to the output terminal a of the control unit (that is, the input terminal of the lamp group 1). If the signal value of the switch operation signal is less than the on-voltage of the switch circuit Q1, that is, the switch operation signal is not enough to turn on the MOS tube Q1, the output of the switch tube can be almost ignored. The current will not flow to the output terminal a of the control unit, so the light-emitting element of the lamp group 1 will not emit light. This is equivalent to generating a control signal that makes all the light-emitting elements of the lamp group 1 not emit light. Among them, when the switch operation signal value is greater than the on-voltage value of the switch and less than the threshold voltage value, the power of the light-emitting element in the corresponding backlight light source assembly increases with the increase of the switch operation signal value, thereby increasing the brightness of a single light-emitting element. When the switch operation signal value is greater than the on-voltage of the switch circuit Q1 and greater than the threshold voltage value of the switch, the light emitting element of the corresponding backlight light source assembly emits light at full power.

[0061] The lamp group 2 is used as an additional backlight light source component, and its control unit is an additional control unit. The input end of the brightness adjustment module in the additional control unit is connected to the photoresistor R L And the common end of the preset resistor R1. The input end of the additional brightness adjustment module is also one of the input ends of the signal amplifier U2. The other input end of the signal amplifier U2 is connected to the common end of the preset resistor R5 and the preset resistor R6. The output end of the signal amplifier U2 is connected to the gate of the switch circuit Q2 and to the preset resistor R7. Resistor R7 is grounded. It should be noted that the specific resistance values ​​of resistors R1 to R7 can be set accordingly according to actual needs. In this example, the switch circuit is a power MOS tube.

[0062] In the above embodiment, the operation result of the electrical signal converted from the collected ambient light intensity and the preset signal in the brightness adjustment module and the additional brightness adjustment module is performed by an operational amplifier. However, those skilled in the art should understand that other devices or components (modules) can also be used, as long as the device or component (such as a combination of multiple operational amplifiers) can control the conduction state of the switch circuit through its own structure and corresponding control to achieve the power adjustment of the light-emitting element in the lamp group, thereby achieving the same effect as the operational amplifier U1 in the above embodiment. The present invention is not limited to this.

[0063] Since the sensor for collecting ambient light generates weak electrical signals in low-brightness environments, in order to ensure stable and reliable control, a signal amplification circuit can be added to the control circuit of lamp group 2. The specific amplification ratio can be set according to demand, for example, it can be 10 times.

[0064] Figure 2 In the example shown, the intensity of ambient light is collected by a photoresistor RL, and a control signal is generated after signal processing to control the light-emitting state of backlight group 1 and light group 2. Light group 1 can be a strong light source and is controlled by a switch: when light group 1 is controlled by a control signal that the light-emitting state is lower than the steady-state light-emitting requirement, the power supply of light group 1 is automatically cut off, thereby stopping the light-emitting state.

[0065] Therefore, those skilled in the art should be able to understand that, in the example, when the ambient light is strong, the first backlight light source assembly can be kept controlled by the external ambient light, and the second backlight light source assembly can be kept in a full-power operating state; when the ambient light is weak (according to the set requirements), the first backlight light source assembly can be turned off, and the operating state of the second backlight light source assembly can be controlled by the ambient light.

[0066] Figure 3 is a circuit diagram of a light-emitting device of a liquid crystal module according to an embodiment of the present invention, Figure 4 FIG. 4 is a circuit diagram of a light emitting device of a liquid crystal module according to another embodiment of the present invention. Figure 3 and Figure 4 The examples shown in Figure 2 The example in corresponds to .

[0067] The light emitting element of the light emitting device can be a light emitting diode, i.e., LED. Figure 3 and Figure 4 The specific number of light-emitting elements can be set according to corresponding requirements, and the design is omitted by curved lines in the figure.

[0068] In addition, specifically Figure 2In the example, the lamp beads of lamp group 1 and lamp group 2 can be of the same model or different models, but the ratio of their quantity should be greater than 1:1. Therefore, the ratio of lamp group 1 to lamp group 2 can be 1:1 ( Figure 3 )、2:1( Figure 4 ) and so on.

[0069] In the case where there are multiple control units, the resistance of the preset resistor in each control unit is different, and the conduction voltage of the switch tube is also different. The distribution of the resistance of the preset resistor and the conduction voltage value of the switch tube is both stepped, so that the light group corresponding to each control unit is controlled in stages. The switch tube also has a threshold voltage value. When the voltage value passing through the switch tube is less than the threshold voltage value but greater than the conduction voltage value, the light-emitting elements of the corresponding light group are all lit, but their brightness will increase with the increase of power, that is, when the ambient light corresponding to the light-on operation signal within this range changes, the brightness of the light-emitting element also changes accordingly. When the voltage value passing through the switch tube exceeds the threshold voltage value, the light-emitting elements of the corresponding light group should all work at full power, that is, all emit light at maximum brightness.

[0070] For example, when there are three control units (the corresponding light groups are light group 1', light group 2', and light group 3', and the light group corresponding to the additional control unit is light group 4'), when the ambient light is the strongest, it may be necessary for light group 2', light group 3', and light group 4' to all emit light at full power, while the brightness of light group 1' is controlled by the ambient light and emits light at full power when necessary; when the ambient light is the second strongest, light group 1' may not need to work (that is, all LED lights are not illuminated), light group 3' and light group 4' emit light at full power, and light group 2' is controlled by the ambient light; when the ambient light is the second weakest, light group 1' and light group 2' may not emit light, light group 4' emits light at full power, and light group 3' is controlled by the ambient light; when the ambient light is the weakest, light group 1', light group 2', and light group 3' may not emit light, and light group 4' is controlled by the ambient light. Among them, the (additional) brightness adjustment module in the (additional) control unit of light group 4' is connected to the ambient light collection module in the control unit corresponding to light group 3'.

[0071] The specific situation of the circuit connection in the above embodiment can be as follows Figure 5 shown. Figure 5In the figure, the first lamp group (backlight source component) is connected to the output terminal a1, the second lamp group is connected to the output terminal a2, the third lamp group is connected to the output terminal a3, and the fourth lamp group (additional backlight source component) is connected to the output terminal b. The names of all components in the first control unit are preceded by "1", the names of all components in the second control unit are preceded by "2", and the names of all components in the third control unit are preceded by "3" to distinguish them. The ambient light collection modules (photoresistors in this embodiment) in the first control unit, the second control unit, and the third control unit are all connected to the positive terminal V+ of the power supply. The circuit structures of the first control unit, the second control unit, and the third control unit are similar to Figure 2 The present invention will not be described in detail here.

[0072] Figure 5 In the embodiment, the power adjustment component in the brightness adjustment module in the additional control unit is U2, whose positive input terminal is connected to the preset resistor R7, and whose negative input terminal is connected to the common end of the preset resistor R5 and the preset resistor R6. The preset resistor R7 is also connected to the positive input terminal of the operational amplifier 3U1 in the third control unit. The negative input terminal of the operational amplifier 3U1 in the third control unit is also connected to the preset resistor R5 and the preset resistor R6 in series. The series resistors R5 and R6 are also connected in parallel with the resistor R3. The output terminal of the signal amplifier U2 is connected to the gate of the switch circuit Q2 and to the preset resistor R8. The resistor R8 is grounded.

[0073] It should be understood that the working parameters of the power adjustment components in the first control unit, the second control unit, and the third control unit are different, so that the lamp groups corresponding to each control unit are controlled in stages. And the specific resistance values ​​of the resistors R1 to R8 can be set accordingly according to actual needs. In this example, the switch circuit is a power MOS tube.

[0074] In this embodiment, the specific brightness value may be, for example, 1500 cd / m 2 When the ambient light is the strongest, it is 600~1500cd / m 2 When the ambient light is weak, it is 50-600cd / m 2 , when the ambient light is the weakest, it is 50cd / m 2 the following.

[0075] Obviously, according to the brightness requirement of the liquid crystal module, the number of control units and corresponding backlight light source components in the embodiment of the present invention can be increased or decreased accordingly. Those skilled in the art should understand that the specific number should be related to the specific brightness value required to be displayed, that is, the number of light-emitting elements (such as LEDs), and this application will not repeat them here.

[0076] Figure 6A flow chart of a backlight brightness control method of a liquid crystal module according to an embodiment of the present invention is shown. The backlight brightness control method can be executed based on the liquid crystal module in the embodiment of the present invention. The flow chart includes steps S01 to S03.

[0077] In step S01, the ambient light collection module collects the light intensity of the external ambient light and converts it into an electrical signal;

[0078] In step S02, the brightness adjustment module and / or the additional brightness adjustment module receives the electrical signal and generates a control signal based at least on the electrical signal and a preset signal value;

[0079] In step S03, the backlight light source assembly and / or the additional backlight light source assembly receives the control signal and enters a corresponding working state according to the control signal.

[0080] The working states include: a first working state in which all light-emitting elements emit light at full power, a second working state in which all light-emitting elements do not emit light, and a third working state in which light-emitting elements emit light at partial power.

[0081] exist Figure 6 In the illustrated embodiment, the electrical signal and the preset signal value may be passed through the power adjustment component to generate a switch operation signal, and the control signal is generated based on the switch operation signal.

[0082] In addition, when the switch operation signal value is less than the switch conduction voltage value, the power supply of the corresponding backlight light source assembly is cut off, thereby being in the second working state;

[0083] When the switch operation signal value is greater than the switch conduction voltage value and less than the threshold voltage value, the corresponding backlight light source assembly is in the third working state;

[0084] When the switch operation signal value is greater than the threshold voltage value of the switch, the corresponding backlight light source assembly is in the first working state.

[0085] The present invention solves the problem that the prior art can only ensure that the display is in a certain brightness range and cannot take into account both ultra-bright and ultra-low brightness steady-state display, and that it is difficult for the prior art to achieve "the surface brightness of the black screen in a dark environment is less than 0.1cd / m 2 "The technical problem of " can be solved by ensuring that the maximum brightness remains unchanged while ensuring a steady-state display of about 5cd / ㎡; effectively reducing the power consumption of the high-brightness module when used in a low-brightness state and prolonging the service life of the backlight source. At the same time, the present invention improves the brightness adaptability of the product, increases the cost of product manufacturing at a small amount, and does not increase the difficulty of the manufacturing process, so that the reliability of the product can be ensured to remain unchanged. In addition, the liquid crystal module manufactured according to the present invention will not cause new environmental pollution problems.

[0086] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiments are merely illustrative and can be understood and implemented by those skilled in the art without creative efforts.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A liquid crystal module capable of controlling backlight brightness, comprising a control device and a light emitting device, The control device includes at least one control unit, the light emitting device includes at least one group of backlight light source components, the control unit and the backlight light source components are connected in pairs, The control unit comprises: An ambient light collection module is used to collect the light intensity of the external ambient light and convert it into an electrical signal; a brightness adjustment module, configured to receive the electrical signal from the ambient light collection module and generate a control signal based at least on the electrical signal and a preset signal value, The control device further includes an additional control unit, which includes an additional brightness adjustment module, and the additional brightness adjustment module is connected to one of the ambient light collection modules; the light emitting device further includes a group of additional backlight light source components, and the additional control unit is connected to the additional backlight light source components. The backlight light source assembly and the additional backlight light source assembly include a plurality of light emitting elements, which are used to receive control signals from corresponding brightness adjustment modules and enter corresponding working states according to the control signals. Among them, the working states include: a first working state in which all light-emitting elements emit light at full power, a second working state in which all light-emitting elements do not emit light, and a third working state in which the light-emitting elements emit light at partial power; in the liquid crystal module, the electrical signal of the ambient light collection module is used to simultaneously control multiple light-emitting elements, and the multiple light-emitting elements can be controlled by the same signal in stages.

2. The liquid crystal module according to claim 1, wherein: The brightness adjustment module includes a power adjustment component and a switch. The electrical signal and the preset signal value generate a switch operation signal after passing through the power adjustment component. The brightness adjustment module is used to control the conduction state of the switch based on the switch operation signal and generate the control signal.

3. The liquid crystal module according to claim 2, wherein: The preset signal value in each control unit is different, and the preset signal value in each control unit is associated with the on-voltage value of the switch in the control unit, so that: When the switch operation signal value is less than the switch conduction voltage value, the power supply of the corresponding backlight light source assembly is cut off, thereby being in the second working state; When the switch operation signal value is greater than the switch on voltage value and less than the threshold voltage value, the corresponding backlight light source assembly is in the third working state; When the switch operation signal value is greater than the threshold voltage value of the switch, the corresponding backlight light source assembly is in the first working state.

4. The liquid crystal module according to claim 1, wherein: The control device comprises a control unit and an additional control unit, and the lighting device comprises a group of backlight light source components and a group of additional backlight light source components.

5. The liquid crystal module according to claim 4, wherein: The light emitting elements in the at least one group of backlight light source assemblies and the additional backlight light source assemblies are of the same type.

6. The liquid crystal module according to claim 5, wherein: The ratio of the number of light emitting elements in the backlight light source assembly and the number of light emitting elements in the additional backlight light source assembly is greater than 1:

1.

7. The liquid crystal module according to claim 6, wherein: The ratio of the number of light emitting elements in the backlight light source assembly and the number of light emitting elements in the additional backlight light source assembly is 2:

1.

8. A method for controlling backlight brightness of a liquid crystal module, wherein the liquid crystal module comprises a backlight light source assembly and an additional backlight light source assembly, the method comprising: Collect the light intensity of external ambient light and convert it into electrical signals; receiving the electrical signal, and generating a control signal based at least on the electrical signal and a preset signal value; receiving the control signal, and entering a corresponding working state according to the control signal; Among them, the working states of the backlight light source assembly and the additional backlight light source assembly include: a first working state in which all light-emitting elements emit light at full power, a second working state in which all light-emitting elements do not emit light, and a third working state in which all light-emitting elements emit light at partial power.

9. The method according to claim 8, wherein: The electrical signal and the preset signal value generate a switch operation signal after passing through the power adjustment component, and the control signal is generated based on the switch operation signal.

10. The method according to claim 9, wherein: When the switch operation signal value is less than the switch conduction voltage value, the power supply of the corresponding backlight light source assembly is cut off, thereby being in the second working state; When the switch operation signal value is greater than the switch on voltage value and less than the threshold voltage value, the corresponding backlight light source assembly is in the third working state; When the switch operation signal value is greater than the threshold voltage value of the switch, the corresponding backlight light source assembly is in the first working state.

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