Adaptive control system and method for multi-model liquid crystal backlight driving

Abstract

This invention discloses an adaptive control system and method for driving multiple types of liquid crystal backlights. The adaptive control system includes a drive current configuration circuit, a display mode control circuit, an input voltage configuration circuit, and a boost drive circuit. The drive current configuration circuit, the display mode control circuit, and the input voltage configuration circuit are connected to the boost drive circuit. The drive current configuration circuit controls the output of a controllable drive current from the boost drive circuit. The display mode control circuit controls the initial operating state of the boost drive circuit. The input voltage configuration circuit provides different input voltages to the boost drive circuit. The boost drive circuit performs constant current driving on the liquid crystal and adjusts the backlight brightness.

Description

Technical Field

[0001] This application relates to a liquid crystal backlight control circuit, belonging to the field of electronic circuit technology, and particularly to an adaptive control system and method for driving multiple types of liquid crystal backlights. Background Technology

[0002] With the rapid development of technology, LEDs, as a new type of energy-saving, safe, and environmentally friendly light source, possess advantages that traditional light sources lack, such as small size, low power consumption, high brightness, and long lifespan, and are widely used in automotive instrument panel backlights. For LCD display products, a matching circuit is required to realize the overall display function. As a crucial component of the instrument panel, automotive instrument panel manufacturers often choose multiple suppliers to ensure their LCDs are readily available. This is to avoid the risk of production stoppages due to a single supplier suddenly discontinuing the supply, and also to prevent price gouging or non-cooperation with OEMs in quality improvements. To address the differentiation issues of LCD products from multiple suppliers and reduce reliance on fixed LCD technology, the instrument panel's LCD driver needs better adaptive capabilities.

[0003] Currently, LCD backlighting typically uses a combination of LEDs connected in series and parallel to provide backlighting for the LCD. The backlight is usually driven by a dedicated constant current driver chip, including both boost and buck drivers, such as... Figure 1 As shown, it mainly consists of four parts: input voltage, constant current output, brightness adjustment, and constant current regulation. Brightness adjustment is controlled by a PWM signal output from a microcontroller unit (MCU), while constant current regulation is achieved through the feedback voltage of the MCU's FB pin, typically adjusted by an external resistor. Therefore, current LCD drivers are all one-to-one drive circuits. If the LCD model changes, the corresponding drive circuit will be incompatible, and the corresponding hardware circuit will need to be improved, resulting in poor circuit adaptability. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this application provides an adaptive control system and method for driving multiple types of liquid crystal backlights, which solves the one-to-many problem of liquid crystal backlight driving by different combinations of liquid crystal backlight driving mode, backlight driving current and input voltage.

[0005] This invention provides an adaptive control system for driving multiple types of liquid crystal backlights. The adaptive control system includes a drive current configuration circuit, a display mode control circuit, an input voltage configuration circuit, and a boost drive circuit. The drive current configuration circuit, the display mode control circuit, and the input voltage configuration circuit are connected to the boost drive circuit.

[0006] The drive current configuration circuit is used to control the output of a controllable drive current of the boost drive circuit.

[0007] The display mode control circuit is used to control the initial operating state of the boost drive circuit;

[0008] The input voltage configuration circuit is used to provide different input voltages to the boost drive circuit;

[0009] The boost drive circuit is used to drive the liquid crystal with constant current and adjust the backlight brightness.

[0010] According to an embodiment of the present invention, the adaptive control system for driving multiple types of liquid crystal backlights further includes: a liquid crystal model acquisition circuit, a microcontroller unit, and a storage unit, wherein the storage unit is connected to the microcontroller unit, and the microcontroller unit is connected to the liquid crystal model acquisition circuit, the drive current configuration circuit, the display mode control circuit, and the input voltage configuration circuit.

[0011] The storage device is used to store relevant information for different models of LCD drivers, including rated driving current, display mode, rated driving voltage, etc.

[0012] The microcontroller unit obtains the model signal of the liquid crystal through the liquid crystal model acquisition circuit and reads the information of the storage, and controls the drive current configuration circuit, the display mode control circuit and the input voltage configuration circuit;

[0013] The microcontroller unit and the boost drive circuit are connected to an external thin-film transistor liquid crystal display.

[0014] According to an embodiment of the present invention, the adaptive control system for driving multiple types of liquid crystal backlights includes a display mode control circuit comprising a first resistor, a second resistor, and a first transistor.

[0015] In this circuit, one end of the first resistor is connected to a 5V voltage, and the other end is connected to the MODEL terminal; one end of the second resistor is connected to the LCD MODEL terminal, and the other end is connected to the base of the first transistor; the emitter of the first transistor is grounded, and the collector of the first transistor is connected to the MODEL terminal; the microcontroller unit controls the on / off state of the first transistor through the second resistor, and the MODEL terminal controls the first transistor to generate a high-level or low-level electrical signal through the microcontroller unit to control the boost drive circuit to work or not work.

[0016] According to an embodiment of the present invention, the adaptive control system for driving multiple types of liquid crystal backlights includes a driving current configuration circuit comprising a second transistor to a fifth transistor and a seventh resistor to a tenth resistor.

[0017] In this circuit, the second transistor and the seventh resistor form one branch, the third transistor and the eighth resistor form another branch, the fourth transistor and the ninth resistor form another branch, and the fifth transistor and the tenth resistor form yet another branch, all connected in parallel. One end of the seventh resistor, one end of the eighth resistor, one end of the ninth resistor, and one end of the tenth resistor are connected in parallel and grounded. The other end of the seventh resistor is connected to the source of the second transistor, and the gate of the second transistor is connected to the first current configuration terminal. The other end of the eighth resistor is connected to the source of the third transistor, and the gate of the third transistor is connected to the second current configuration terminal. The other end of the ninth resistor is connected to the source of the fourth transistor, and the gate of the fourth transistor is connected to the third current configuration terminal. The other end of the tenth resistor is connected to the source of the fifth transistor, and the gate of the fifth transistor is connected to the fourth current configuration terminal. The drains of the second transistor, the third transistor, the fourth transistor, and the fifth transistor are connected in parallel and connected to the LEDK terminal.

[0018] According to an embodiment of the present invention, the adaptive control system for driving multiple types of liquid crystal backlights includes an input voltage configuration circuit comprising a first power management chip, a second power management chip, a first capacitor to a third capacitor, a fifth capacitor to a seventh capacitor, a third resistor, and a sixth resistor.

[0019] In this configuration, pins 1, 2, 5, and 6 of the first power management chip are connected to the boost drive circuit; pin 3 of the first power management chip is connected to one end of the third resistor, and the other end of the third resistor is connected to the microcontroller unit; pin 4 of the first power management chip is connected to a 12V power supply; and the microcontroller unit controls the on / off state of the first power management chip through pin 3; the first capacitor is connected between pins 3 and 4 of the first power management chip; one end of the second capacitor is connected to the 12V power supply, and the other end is grounded; one end of the third capacitor is connected to pin 1 of the first power management chip, and the other end is grounded.

[0020] The output pins 1, 2, 5, and 6 of the second power management chip are connected to the boost drive circuit. Pin 3 of the second power management chip is connected to one end of the sixth resistor, and the other end of the sixth resistor is connected to the microcontroller unit. Pin 4 of the second power management chip is connected to a 5V power supply. The microcontroller unit controls the on / off state of the second power management chip through pin 3. The fifth capacitor is connected between pins 3 and 4 of the second power management chip. One end of the sixth capacitor is connected to the 5V power supply, and the other end is grounded. One end of the seventh capacitor is connected to pin 1 of the second power management chip, and the other end is grounded.

[0021] According to the adaptive control system for driving multiple types of liquid crystal backlights provided in the embodiments of the present invention, the first power management chip and the second power management chip cannot be turned on simultaneously.

[0022] According to an embodiment of the present invention, the adaptive control system for driving multiple types of liquid crystal backlights includes a boost drive circuit comprising a boost drive chip, a fourth resistor, a first capacitor, a first diode, and a first inductor.

[0023] Specifically, pins 1, 3, 6, 10, and 11 of the boost driver chip are grounded; pin 2 of the boost driver chip is connected to the LEDK terminal, which is connected to the drive current configuration circuit; pins 4 and 5 of the boost driver chip are connected to one end of the first inductor; pin 7 of the boost driver chip is connected to the other end of the first inductor; pin 8 of the boost driver chip is connected to the LEDA terminal; and pin 9 of the boost driver chip is connected to the MODEL terminal, which is connected to the display mode control circuit.

[0024] One end of the fourth resistor is connected to the MODEL terminal, and the other end is connected to the TFT PWM signal terminal; one end of the fourth capacitor is connected to pin 7 of the boost driver chip and the LCD POWER terminal, and the other end is grounded; the anode of the first diode is connected to one end of the first inductor, and the cathode of the first diode is connected to the LEDA terminal.

[0025] According to the adaptive control system for driving multiple types of liquid crystal backlights provided in the embodiments of the present invention, pin 7 of the boost driver chip is connected to pins 1, 2, 5, and 6 of the first power management chip and pins 1, 2, 5, and 6 of the second power management chip.

[0026] According to an embodiment of the present invention, the adaptive control system for driving multiple types of liquid crystal backlights includes an input voltage configuration circuit for providing at least two different input voltages to the boost driving circuit; the boost driving circuit linearly adjusts the backlight brightness of the liquid crystal.

[0027] This invention also provides an adaptive control method for driving multiple types of liquid crystal backlights, including:

[0028] The LCD model acquisition circuit acquires LCD model information.

[0029] The microcontroller reads relevant parameters of the connected LCD driver configuration, including rated drive current, display mode, rated drive voltage, and other information.

[0030] The microcontroller unit controls the drive current configuration circuit to configure the drive current.

[0031] The microcontroller unit controls the input voltage configuration circuit to configure the input voltage.

[0032] The microcontroller unit controls the display mode control circuit to configure the display driving mode;

[0033] Check if the display driving mode is correct; if not, return to the step of configuring the display driving mode by controlling the microcontroller control circuit; if correct, proceed to the next step.

[0034] The microcontroller unit controls the LCD backlight to illuminate normally.

[0035] The beneficial effects of this invention are as follows: This invention provides an adaptive control system and method for driving multiple types of liquid crystal backlights. It includes a drive current configuration circuit to configure the drive current, a voltage configuration circuit to configure the input voltage, and a display mode control circuit to configure the display drive mode. By configuring the drive current, setting the display mode, and configuring the input voltage, different drive combinations are generated to adapt to the driving of different types of liquid crystal backlights. This achieves driving multiple liquid crystal backlights, resulting in greater circuit versatility. It can effectively reduce supply chain costs, reduce reliance on fixed liquid crystals, reduce inventory costs, save delivery time, improve product quality while reducing inventory levels, and shorten the development cycle. Attached Figure Description

[0036] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0037] Figure 1 This is a schematic diagram of a liquid crystal backlight driving circuit in the prior art.

[0038] Figure 2 This is a schematic diagram of an adaptive control system for driving multi-model liquid crystal backlights provided in an embodiment of the present invention.

[0039] Figure 3 This is a schematic diagram of the display mode control circuit provided in this embodiment.

[0040] Figure 4 This is a schematic diagram of the drive current configuration circuit provided in this embodiment.

[0041] Figure 5 This is a schematic diagram of the input voltage configuration circuit provided in this embodiment.

[0042] Figure 6 This is a schematic diagram of the boost drive circuit provided in this embodiment.

[0043] Figure 7 This is a flowchart illustrating a liquid crystal backlight control method provided in an embodiment of the present invention. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0045] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0046] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0047] In existing technologies, LCD backlight drivers are typically designed for a specific LCD model. If the LCD model changes, the corresponding driver circuit becomes incompatible. However, since different LCD suppliers offer different LCD models, a single LCD backlight driver circuit is needed that can support multiple LCD models. Different LCD models also have different display modes, including standard black and standard white. The driving current of different LCDs also varies, typically ranging from 200 mA to 800 mA, and the backlight voltage also differs, typically ranging from 9V to 25V. Therefore, to address the different display modes, driving currents, and driving voltages required for different LCD models, a more flexible backlight driver circuit that can adapt to various LCD models is needed.

[0048] like Figure 2 The diagram shown is a schematic representation of an adaptive control system for driving multiple types of liquid crystal backlights according to an embodiment of the present invention. The adaptive control system includes a drive current configuration circuit, a display mode control circuit, an input voltage configuration circuit, and a boost drive circuit. The drive current configuration circuit, the display mode control circuit, and the input voltage configuration circuit are connected to the boost drive circuit. The drive current configuration circuit controls the output of a controllable drive current from the boost drive circuit. The display mode control circuit controls the initial operating state of the boost drive circuit. The input voltage configuration circuit provides different input voltages to the boost drive circuit. The boost drive circuit performs constant current driving on the liquid crystal and adjusts the backlight brightness.

[0049] The adaptive control system for multi-model LCD backlight drivers further includes: an LCD model acquisition circuit, a microcontroller unit, and a storage unit. The storage unit is connected to the microcontroller unit, which is connected to the LCD model acquisition circuit, the drive current configuration circuit, the display mode control circuit, and the input voltage configuration circuit. The storage unit stores relevant information for different LCD models, including rated drive current, display mode, and rated drive voltage. The microcontroller unit reads the information from the storage unit and controls the drive current configuration circuit, the display mode control circuit, and the input voltage configuration circuit. The microcontroller unit and the boost drive circuit are connected to an external thin-film transistor liquid crystal display.

[0050] Specifically, the driving information for different LCD models, including the backlight mode, driving current, and driving voltage, is first stored in the memory. When different LCD models are connected to the control system, the microcontroller obtains the LCD model signal through the LCD model acquisition circuit and reads the relevant information of the connected LCD. After confirming that the LCD model matches, the relevant parameters are configured through the driving current configuration circuit, the display mode control circuit, and the input voltage configuration circuit. Then, the LCD is driven by the boost driving circuit.

[0051] Specifically, the input voltage configuration circuit provides at least two different input voltages to the boost drive circuit; and in the boost drive circuit, the backlight brightness of the liquid crystal is linearly adjusted.

[0052] like Figure 3 The diagram shown is a schematic of the display mode control circuit provided in this embodiment. The display mode control circuit includes a first resistor, a second resistor, and a first transistor. One end of the first resistor is connected to a 5V voltage, and the other end is connected to the MODEL terminal. One end of the second resistor is connected to the LCD MODEL terminal, and the other end is connected to the base of the first transistor. The emitter of the first transistor is grounded, and the collector of the first transistor is connected to the MODEL terminal. The microcontroller unit controls the on / off state of the first transistor through the second resistor, and the MODEL terminal controls the first transistor to generate a high-level or low-level electrical signal through the microcontroller unit to control the boost drive circuit to operate or not operate.

[0053] Specifically, the MODEL terminal is connected to the boost drive circuit, and the MODEL terminal is connected to a 5V power supply through the first resistor. Then, the MODEL terminal controls the first transistor to generate a high level through the microcontroller unit to control the boost drive circuit to work, or the MODEL terminal controls the first transistor to generate a low level through the microcontroller unit to control the boost drive circuit to not work.

[0054] like Figure 4 The diagram shown is a schematic diagram of the drive current configuration circuit provided in this embodiment. The drive current configuration circuit includes a second to a fifth transistor and a seventh to a tenth resistor; wherein, the second transistor and the seventh resistor form one branch, the third transistor and the eighth resistor form one branch, the fourth transistor and the ninth resistor form one branch, and the fifth transistor and the tenth resistor form one branch, and the branches are connected in parallel; one end of the seventh resistor, one end of the eighth resistor, one end of the ninth resistor, and one end of the tenth resistor are connected in parallel and grounded; the other end of the seventh resistor is connected to the source of the second transistor, and the gate of the second transistor is connected to the first current configuration terminal; the other end of the eighth resistor is connected to the source of the third transistor, and the gate of the third transistor is connected to the second current configuration terminal; the other end of the ninth resistor is connected to the source of the fourth transistor, and the gate of the fourth transistor is connected to the third current configuration terminal; the other end of the tenth resistor is connected to the source of the fifth transistor, and the gate of the fifth transistor is connected to the fourth current configuration terminal; the drains of the second transistor, the third transistor, the fourth transistor, and the fifth transistor are connected in parallel and connected to the LEDK terminal.

[0055] Specifically, the microcontroller unit is connected to the first current configuration terminal, the second current configuration terminal, the third current configuration terminal, and the fourth current configuration terminal, respectively. The microcontroller unit controls the switching of the second to the fifth transistors to combine the seventh to the tenth resistors and generate different current-limiting resistor values, which are then connected to the LEDK terminal. The LEDK terminal is connected to the boost drive circuit, which in turn generates different drive currents to drive different liquid crystals.

[0056] like Figure 5 The diagram shown is a structural schematic of the input voltage configuration circuit provided in this embodiment. The input voltage configuration circuit includes a first power management chip, a second power management chip, a first capacitor to a third capacitor, a fifth capacitor to a seventh capacitor, a third resistor, and a sixth resistor.

[0057] In this configuration, pins 1, 2, 5, and 6 of the first power management chip are connected to the boost drive circuit; pin 3 of the first power management chip is connected to one end of the third resistor, and the other end of the third resistor is connected to the microcontroller unit; pin 4 of the first power management chip is connected to a 12V power supply; and the microcontroller unit controls the on / off state of the first power management chip through pin 3; the first capacitor is connected between pins 3 and 4 of the first power management chip; one end of the second capacitor is connected to the 12V power supply, and the other end is grounded; one end of the third capacitor is connected to pin 1 of the first power management chip, and the other end is grounded.

[0058] The output pins 1, 2, 5, and 6 of the second power management chip are connected to the boost drive circuit. Pin 3 of the second power management chip is connected to one end of the sixth resistor, and the other end of the sixth resistor is connected to the microcontroller unit. Pin 4 of the second power management chip is connected to a 5V power supply. The microcontroller unit controls the on / off state of the second power management chip through pin 3. The fifth capacitor is connected between pins 3 and 4 of the second power management chip. One end of the sixth capacitor is connected to the 5V power supply, and the other end is grounded. One end of the seventh capacitor is connected to pin 1 of the second power management chip, and the other end is grounded.

[0059] Specifically, in this embodiment, the input voltage configuration circuit can provide at least two input voltages, including but not limited to 5V and 12V. In specific LCD backlight applications, when the required voltage for the LCD backlight is between 9V and 17V, the second power management chip can be used to provide 5V to the boost driver circuit. When the required voltage for the LCD backlight is between 17V and 25V, the first power management chip can be used to provide 12V to the boost driver circuit. Specifically, the microcontroller unit controls the on / off state of the first power management chip via pin 3 to provide the input voltage to the boost driver circuit; the microcontroller unit also controls the on / off state of the second power management chip via pin 3 to provide the input voltage to the boost driver circuit.

[0060] The first power management chip and the second power management chip cannot be turned on simultaneously. In one application, only one of the first power management chip and the second power management chip can be turned on to provide input voltage to the boost drive circuit.

[0061] like Figure 6 The diagram shown is a schematic of the boost drive circuit provided in this embodiment. The boost drive circuit includes a boost drive chip, a fourth resistor, a first capacitor, a first diode, and a first inductor.

[0062] Specifically, pins 1, 3, 6, 10, and 11 of the boost driver chip are grounded; pin 2 of the boost driver chip is connected to the LEDK terminal, which is connected to the drive current configuration circuit; pins 4 and 5 of the boost driver chip are connected to one end of the first inductor; pin 7 of the boost driver chip is connected to the other end of the first inductor; pin 8 of the boost driver chip is connected to the LEDA terminal; and pin 9 of the boost driver chip is connected to the MODEL terminal, which is connected to the display mode control circuit.

[0063] One end of the fourth resistor is connected to the MODEL terminal, and the other end is connected to the TFT PWM signal terminal; one end of the fourth capacitor is connected to pin 7 of the boost driver chip and the LCD POWER terminal, and the other end is grounded; the anode of the first diode is connected to one end of the first inductor, and the cathode of the first diode is connected to the LEDA terminal.

[0064] Pin 7 of the boost driver chip is connected to pins 1, 2, 5, and 6 of the first power management chip and pins 1, 2, 5, and 6 of the second power management chip.

[0065] Specifically, the display mode control circuit is connected to pin 9 of the boost driver chip via the MODEL terminal, and the drive current configuration circuit is connected to pin 2 of the boost driver chip via the LEDK terminal.

[0066] The boost drive circuit provides constant current drive to the liquid crystal and can generate a PWM signal through the microcontroller unit to control the brightness of the liquid crystal display.

[0067] Specifically, this embodiment uses the AN_SY7203 boost driver chip as an example. Other boost driver chips with similar functions can be used in other applications. The AN_SY7203 chip has an input voltage range of 2.8V-30V, a switching current of 4A, and a maximum driving voltage of 30V for the LED diode. The drive current configuration circuit is connected to pin 2, the input voltage configuration circuit is connected to pin 7, the display mode control circuit is connected to pin 9, and the backlight positive terminal of the LCD is connected to the LEDA terminal, while the negative terminal is connected to the LEDK terminal. Taking a backlight driver consisting of four series and parallel LED branches with a voltage of 25V and a current of 80mA as an example, in the adaptive control system of the multi-model LCD backlight driver provided in this embodiment, after the microcontroller reads the relevant information of the backlight driver parameters, it controls the drive current configuration circuit to stabilize the output current of the boost drive circuit at 300mA, selects a 12V input voltage by controlling the input voltage configuration circuit, and controls the boost drive circuit to work by controlling the output high-level circuit of the display mode control circuit. The LCD backlight is driven to light up through the LEDA terminal and the LEDK terminal, and the brightness is adjusted by the microcontroller through the TFT PWM signal.

[0068] like Figure 7 The diagram shown is a flowchart illustrating an adaptive control method for driving multiple types of liquid crystal backlights according to an embodiment of the present invention. The method includes:

[0069] The LCD model acquisition circuit acquires LCD model information.

[0070] The microcontroller reads relevant parameters of the connected LCD driver configuration, including rated drive current, display mode, rated drive voltage, and other information.

[0071] The microcontroller unit controls the drive current configuration circuit to configure the drive current.

[0072] The microcontroller unit controls the input voltage configuration circuit to configure the input voltage.

[0073] The microcontroller unit controls the display mode control circuit to configure the display driving mode;

[0074] Check if the display driving mode is correct; if not, return to the step of configuring the display driving mode by controlling the microcontroller control circuit; if correct, proceed to the next step.

[0075] The microcontroller unit controls the LCD backlight to illuminate normally.

[0076] This invention provides an adaptive control system and method for driving multiple types of LCD backlights. It includes a drive current configuration circuit to configure the drive current, a voltage configuration circuit to configure the input voltage, and a display mode control circuit to configure the display drive mode. By configuring the drive current, setting the display mode, and configuring the input voltage, different drive combinations are generated to adapt to the driving of different LCD backlight models. This achieves driving of multiple LCD backlights, resulting in greater circuit versatility. It can effectively reduce supply chain costs, reduce reliance on fixed LCDs, reduce inventory costs, save delivery time, improve product quality while reducing inventory levels, and shorten development cycles.

[0077] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the present invention. Finally, it should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0078] The adaptive control system and method for driving multi-model liquid crystal backlights provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An adaptive control system for driving multiple types of liquid crystal backlights, characterized in that, The adaptive control system for driving multiple LCD backlight models includes a drive current configuration circuit, a display mode control circuit, an input voltage configuration circuit, and a boost drive circuit; the drive current configuration circuit, the display mode control circuit, and the input voltage configuration circuit are connected to the boost drive circuit. The drive current configuration circuit is used to control the output of a controllable drive current of the boost drive circuit. The display mode control circuit is used to control the initial operating state of the boost drive circuit; The input voltage configuration circuit is used to provide different input voltages to the boost drive circuit; The boost drive circuit is used to drive the liquid crystal with constant current and adjust the backlight brightness. The adaptive control system for driving multiple LCD backlight models further includes: an LCD model acquisition circuit, a microcontroller unit, and a storage unit. The storage unit is connected to the microcontroller unit, and the microcontroller unit is connected to the LCD model acquisition circuit, the drive current configuration circuit, the display mode control circuit, and the input voltage configuration circuit. The storage device is used to store relevant information for different models of LCD drivers, including rated driving current, display mode, rated driving voltage, etc. The microcontroller unit obtains the model signal of the liquid crystal through the liquid crystal model acquisition circuit and reads the information of the storage, and controls the drive current configuration circuit, the display mode control circuit and the input voltage configuration circuit; The microcontroller unit and the boost drive circuit are connected to an external thin-film transistor liquid crystal display.

2. The adaptive control system for driving multiple types of liquid crystal backlights according to claim 1, characterized in that, The display mode control circuit includes a first resistor, a second resistor, and a first transistor; In this circuit, one end of the first resistor is connected to a 5V voltage, and the other end is connected to the MODEL terminal; one end of the second resistor is connected to the LCD MODEL terminal, and the other end is connected to the base of the first transistor; the emitter of the first transistor is grounded, and the collector of the first transistor is connected to the MODEL terminal; the microcontroller unit controls the on / off state of the first transistor through the second resistor, and the MODEL terminal controls the first transistor to generate a high-level or low-level electrical signal through the microcontroller unit to control the boost drive circuit to work or not work.

3. The adaptive control system for driving multiple types of liquid crystal backlights according to claim 2, characterized in that, The drive current configuration circuit includes a second to a fifth transistor and a seventh to a tenth resistor; In this circuit, the second transistor and the seventh resistor form one branch, the third transistor and the eighth resistor form another branch, the fourth transistor and the ninth resistor form another branch, and the fifth transistor and the tenth resistor form yet another branch, all connected in parallel. One end of the seventh resistor, one end of the eighth resistor, one end of the ninth resistor, and one end of the tenth resistor are connected in parallel and grounded. The other end of the seventh resistor is connected to the source of the second transistor, and the gate of the second transistor is connected to the first current configuration terminal. The other end of the eighth resistor is connected to the source of the third transistor, and the gate of the third transistor is connected to the second current configuration terminal. The other end of the ninth resistor is connected to the source of the fourth transistor, and the gate of the fourth transistor is connected to the third current configuration terminal. The other end of the tenth resistor is connected to the source of the fifth transistor, and the gate of the fifth transistor is connected to the fourth current configuration terminal. The drains of the second transistor, the third transistor, the fourth transistor, and the fifth transistor are connected in parallel and connected to the LEDK terminal.

4. The adaptive control system for driving multiple types of liquid crystal backlights according to claim 3, characterized in that, The input voltage configuration circuit includes a first power management chip, a second power management chip, a first capacitor to a third capacitor, a fifth capacitor to a seventh capacitor, a third resistor, and a sixth resistor; In this configuration, pins 1, 2, 5, and 6 of the first power management chip are connected to the boost drive circuit; pin 3 of the first power management chip is connected to one end of the third resistor, and the other end of the third resistor is connected to the microcontroller unit; pin 4 of the first power management chip is connected to a 12V power supply; and the microcontroller unit controls the on / off state of the first power management chip through pin 3; the first capacitor is connected between pins 3 and 4 of the first power management chip; one end of the second capacitor is connected to the 12V power supply, and the other end is grounded; one end of the third capacitor is connected to pin 1 of the first power management chip, and the other end is grounded. The output pins 1, 2, 5, and 6 of the second power management chip are connected to the boost drive circuit. Pin 3 of the second power management chip is connected to one end of the sixth resistor, and the other end of the sixth resistor is connected to the microcontroller unit. Pin 4 of the second power management chip is connected to a 5V power supply. The microcontroller unit controls the on / off state of the second power management chip through pin 3. The fifth capacitor is connected between pins 3 and 4 of the second power management chip. One end of the sixth capacitor is connected to the 5V power supply, and the other end is grounded. One end of the seventh capacitor is connected to pin 1 of the second power management chip, and the other end is grounded.

5. The adaptive control system for driving multiple types of liquid crystal backlights according to claim 4, characterized in that, The first power management chip and the second power management chip cannot be turned on simultaneously.

6. The adaptive control system for driving multiple types of liquid crystal backlights according to claim 4, characterized in that, The boost drive circuit includes a boost drive chip, a fourth resistor, a fourth capacitor, a first diode, and a first inductor. Specifically, pins 1, 3, 6, 10, and 11 of the boost driver chip are grounded; pin 2 of the boost driver chip is connected to the LEDK terminal, which is connected to the drive current configuration circuit; pins 4 and 5 of the boost driver chip are connected to one end of the first inductor; pin 7 of the boost driver chip is connected to the other end of the first inductor; pin 8 of the boost driver chip is connected to the LEDA terminal; and pin 9 of the boost driver chip is connected to the MODEL terminal, which is connected to the display mode control circuit. One end of the fourth resistor is connected to the MODEL terminal, and the other end is connected to the TFT PWM signal terminal; one end of the fourth capacitor is connected to pin 7 of the boost driver chip and the LCD POWER terminal, and the other end is grounded; the anode of the first diode is connected to one end of the first inductor, and the cathode of the first diode is connected to the LEDA terminal.

7. The adaptive control system for driving multiple types of liquid crystal backlights according to claim 6, characterized in that, Pin 7 of the boost driver chip is connected to pins 1, 2, 5, and 6 of the first power management chip and pins 1, 2, 5, and 6 of the second power management chip.

8. The adaptive control system for driving multiple types of liquid crystal backlights according to claim 1, characterized in that, The input voltage configuration circuit provides at least two different input voltages to the boost drive circuit; the boost drive circuit linearly adjusts the backlight brightness of the liquid crystal.

9. An adaptive control method for driving multiple types of liquid crystal backlights, based on the adaptive control system for driving multiple types of liquid crystal backlights according to any one of claims 1-8, characterized in that, include: The LCD model acquisition circuit acquires LCD model information. The microcontroller reads relevant parameters of the connected LCD driver configuration, including rated drive current, display mode, rated drive voltage, and other information. The microcontroller unit controls the drive current configuration circuit to configure the drive current. The microcontroller unit controls the input voltage configuration circuit to configure the input voltage. The microcontroller unit controls the display mode control circuit to configure the display driving mode; Check if the display driving mode is correct; if not, return to the step of configuring the display driving mode by the microcontroller control circuit. If correct, proceed to the next step; The microcontroller unit controls the LCD backlight to illuminate normally.

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