Backlight unit control method, electronic device and storage medium

Abstract

The present application provides a control method, electronic device, and storage medium for a backlight unit. Within a preset time after the backlight unit is powered on, the method outputs a smaller current drive current based on a preset drive current sent by a backlight controller, while simultaneously adjusting the backlight voltage of the light-emitting unit. After the preset time, the method receives a display signal sent by the backlight controller and adjusts the brightness of the light-emitting unit based on the display signal. The present application's solution adjusts the backlight voltage of the light-emitting unit while applying a smaller drive current to the light-emitting unit, thereby avoiding the occurrence of momentary large currents during backlight unit adjustment, thereby preventing the condition for determining a back-end short circuit and enabling the power supply to provide the backlight drive current to the light-emitting unit.

Description

Technical Field

[0001] The present application relates to the field of display, and in particular to a control method for a backlight unit, an electronic device, and a storage medium. Background Art

[0002] Mini-LED (Mini-LED) backlight drivers are widely used in current devices. Driving LEDs requires significant current. Therefore, the performance of the power supply and the timing of power cycles are crucial. Improper power-up timing, in particular, can cause the power supply to trip or reset.

[0003] If the power supply is a locked power supply, it will no longer output voltage after determining that the back end is short-circuited, and thus cannot provide backlight driving current for the light-emitting diode.

[0004] Therefore, how to control the power-on sequence is a more important issue. Summary of the Invention

[0005] The present application provides a control method of a backlight unit, an electronic device, and a storage medium, for improving a power-on timing sequence.

[0006] In a first aspect, the present application provides a method for controlling a backlight unit, wherein the backlight unit includes a plurality of backlight drivers arranged in an array, each backlight driver being connected to a light-emitting unit. The method is applicable to any backlight driver, and the method includes:

[0007] outputting a current driving current according to a preset driving current sent by a backlight controller within a preset time after the backlight unit is powered on, and adjusting the backlight voltage of the light-emitting unit to be within a preset voltage range, wherein the current driving current is less than the preset driving current;

[0008] After the preset time, a display signal sent by the backlight controller is received, and the brightness of the light-emitting unit is adjusted according to the display signal.

[0009] Optionally, outputting the current driving current according to the preset driving current sent by the backlight controller specifically includes:

[0010] receiving a preset driving current and a preset pulse width modulation signal sent by a backlight controller;

[0011] The current driving current is output according to the preset driving current and the preset pulse width modulation signal.

[0012] Optionally, the preset time includes n time periods, where n is an integer greater than 1;

[0013] Outputting the current driving current according to the preset driving current sent by the backlight controller specifically includes:

[0014] In the first time period of the n time periods, receiving a preset driving current and m successively increasing preset reduction ratios sent by the backlight controller, where m is an integer greater than 1 and less than n-1;

[0015] In the n time periods, from the second time period to the m+1th time period, outputting a corresponding target driving current according to the preset driving current and the corresponding preset reduction ratio;

[0016] The preset driving current is outputted during the (m+2)th time period to the (n)th time period among the n time periods.

[0017] Optionally, the preset time includes a first time period and a second time period;

[0018] Receiving a preset driving current and a preset pulse width modulation signal sent by a backlight controller, and outputting a current driving current according to the preset driving current and the preset pulse width modulation signal, specifically comprising:

[0019] In the first time period, receiving a preset driving current and a preset pulse width modulation signal sent by the backlight controller, and outputting a current driving current according to the preset driving current and the preset pulse width modulation signal;

[0020] The step of adjusting the backlight voltage of the light emitting unit to within a preset voltage range specifically includes:

[0021] During the second period, the current feedback voltage of the backlight driver is sent to the backlight controller; when the current feedback voltage is outside the preset voltage range, the backlight controller adjusts the output voltage of the power supply by controlling the voltage of the preset signal until the current feedback voltage is within the preset voltage range.

[0022] In a second aspect, the present application provides a method for controlling a backlight unit, wherein the backlight unit includes a plurality of backlight drivers arranged in an array, each backlight driver being connected to a light-emitting unit. The method is applied to a backlight controller, and the method includes:

[0023] within a preset time after the backlight unit is powered on, sending a preset driving current to the backlight driver and adjusting the backlight voltage of the light-emitting unit to be within a preset voltage range; the backlight driver outputs a current driving current according to the preset driving current, wherein the current driving current is less than the preset driving current;

[0024] After the preset time, a display signal is sent to the backlight driver; and the backlight driver adjusts the brightness of the light-emitting unit according to the display signal.

[0025] Optionally, the preset time includes a first time period and a second time period;

[0026] The sending a preset driving current to the backlight driver specifically includes:

[0027] During the first period, a preset driving current and a preset pulse width modulation signal are sent to the backlight driver, and the backlight driver outputs a current driving current according to the preset driving current and the preset pulse width modulation signal;

[0028] In the second period, the current feedback voltage sent by the backlight driver is received. When the current feedback voltage is outside the preset voltage range, the output voltage of the power supply is adjusted by controlling the voltage of the preset signal until the current feedback voltage is within the preset voltage range.

[0029] Optionally, the preset time includes n time periods, where n is an integer greater than 1;

[0030] The sending a preset driving current to the backlight driver specifically includes:

[0031] In the first time period among the n time periods, a preset driving current and m successively increasing preset reduction ratios are sent to the backlight driver, where m is an integer greater than 1 and less than n-1; the backlight driver outputs a corresponding target driving current from the second time period to the m+1th time period among the n time periods according to the preset driving current and the corresponding preset reduction ratio, and outputs the preset driving current from the m+2th time period to the nth time period among the n time periods.

[0032] Optionally, adjusting the backlight voltage of the light-emitting unit to within a preset voltage range specifically includes:

[0033] During the second to ath periods of the n time periods, the output voltage of the power supply is adjusted according to a default voltage value of a preset signal to adjust the backlight voltage of the light-emitting unit to within a preset voltage range, where a is an integer preset signal greater than 1 and less than m;

[0034] In the a+1th time period of the n time periods, a current feedback voltage sent by the backlight driver is received, and an output voltage of a power supply is adjusted according to the current feedback voltage so that the current feedback voltage is within a preset voltage range.

[0035] In a third aspect, the present application provides an electronic device, comprising: a memory and a processor;

[0036] The memory is used to store instructions; the processor is used to call the instructions in the memory to execute the method in the first aspect and any possible design of the first aspect.

[0037] In a fourth aspect, the present application provides a computer-readable storage medium, which stores computer instructions. When at least one processor of an electronic device executes the computer instructions, the electronic device executes the method in the first aspect and any possible design of the first aspect.

[0038] In a fifth aspect, the present application provides a computer program product, which includes computer instructions. When at least one processor of an electronic device executes the computer instructions, the electronic device executes the method in the first aspect and any possible design of the first aspect.

[0039] The control method, electronic device, and storage medium provided in this application output a smaller current drive current based on a preset drive current sent by a backlight controller within a preset time after the backlight unit is powered on, while simultaneously adjusting the backlight voltage of the light-emitting unit. After the preset time, the control method receives a display signal sent by the backlight controller and adjusts the brightness of the light-emitting unit based on the display signal. By adjusting the backlight voltage of the light-emitting unit while applying a smaller drive current to the light-emitting unit, the solution of this application avoids the occurrence of a momentary large current when adjusting the backlight unit, thereby preventing the condition for determining a back-end short circuit and enabling the power supply to provide the backlight drive current to the light-emitting unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the present application or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0041] Figure 1 A schematic diagram of a power-on timing sequence provided by an embodiment;

[0042] Figure 2 A control circuit diagram of a voltage of a preset signal provided by an embodiment;

[0043] Figure 3 A schematic structural diagram of a backlight unit provided in one embodiment of the present application;

[0044] Figure 4 A flowchart of a method for controlling a backlight unit according to an embodiment of the present application;

[0045] Figure 5 A schematic diagram of a power-on timing sequence provided in an embodiment of the present application;

[0046] Figure 6 A flowchart of a method for controlling a backlight unit according to another embodiment of the present application;

[0047] Figure 7 A schematic diagram of a power-on timing sequence provided in another embodiment of the present application;

[0048] Figure 8 A flowchart of a method for controlling a backlight unit according to another embodiment of the present application;

[0049] Figure 9 A flowchart of a method for controlling a backlight unit according to another embodiment of the present application;

[0050] Figure 10 A schematic diagram of a control device for a backlight unit provided in one embodiment of the present application;

[0051] Figure 11 A schematic diagram of a control device for a backlight unit provided in another embodiment of the present application;

[0052] Figure 12 A schematic diagram of the hardware structure of an electronic device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0053] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0054] Mini-LED (Mini-LED) backlight drivers are widely used in current devices. Driving LEDs requires significant current. Therefore, the performance of the power supply and the timing of power cycles are crucial. Improper power-up timing, in particular, can cause the power supply to trip or reset.

[0055] For example, in the whole machine power on / off test, when the machine is turned on / off twice (i.e., the power is not turned off and the machine is turned on / off by the remote control panel), after the backlight driver is powered on, if the timing control is not appropriate, the backlight driving current of the LED will have a momentary high current. Figure 1 As shown, when the backlight driver enable signal Di_ON is high, the backlight driver is turned on. After the backlight driver is turned on, if the backlight driving current corresponding to the display signal received by the backlight driver is large, it is easy to cause the backlight driving current I_VLED to have a momentary large current.

[0056] Then, the high current drops, so that when the power is turned on, there is a pit in the current for more than ten milliseconds, such as Figure 1 As shown, during this ten-plus millisecond period, the power supply will determine that the backend (e.g., the backlight driver) has a short circuit or is restarting. In this case, if the power supply is a locked power supply, it will stop outputting voltage after determining the backend short circuit, thus failing to provide backlight drive current to the LEDs and, consequently, failing to power on the remote control board.

[0057] In some embodiments, the acceptable power or driving capability of the power supply can be increased. For example, the light emitting diode only uses a current of 10A, while the power supply can provide a larger current, such as 20A.

[0058] In other embodiments, the power of the backlight screen output by the front-end system (such as the backlight driver, backlight controller, etc.) can be adjusted when the remote control panel is used to turn the machine on and off, so that the backlight driver does not draw such a large current after powering on.

[0059] However, increasing the acceptable power or driving capability of the power supply will result in wasted resources and increased costs. Adjusting the backlight power output by the front-end system requires modifying the front-end system, which is complex and difficult to implement.

[0060] In order to solve the above problems, the applicant further studied and found that:

[0061] To accommodate the varying power requirements of dynamic images, the power supply adjusts its output voltage above and below the rated voltage required by the light-emitting unit (e.g., LED) for different dynamic images. Specifically, the power supply adjusts its output voltage based on a preset signal (ADJ). Different voltage values of the preset signal result in different output voltages. The preset signal is fed back in real time based on the voltage required by the light-emitting unit.

[0062] For example, the rated voltage required by the light-emitting unit is 25V, the voltage fluctuation range of the light-emitting unit during operation is 24-27V, the adjustable voltage range of the power supply output is 18-30V, and the adjustable voltage range of the preset signal is 0.3-2.5V. When the preset signal voltage is 0.3V, the power supply output voltage is 30V, and when the preset signal voltage is 2.5V, the power supply output voltage is 18V.

[0063] In actual applications, when the power supply is turned on, the output voltage of the power supply is the highest voltage, such as 30V. In order to achieve the rated voltage required by the light-emitting unit, the preset signal corresponds to the initial adjustment value or the default adjustment value, such as about 1.2V. After the power supply receives the preset signal, it reduces the output voltage to a voltage close to the rated voltage.

[0064] For example, the preset signal can be a pulse width modulation signal (PWM) coupled through a resistor-capacitance circuit (RC circuit), and the voltage of the preset signal can be controlled by controlling the duty cycle of the pulse width modulation signal. Figure 2 As shown, during the time period from when the backlight driver is powered on to when the backlight driver outputs the pulse width modulation signal PWM, the pulse modulation pin output is in a high impedance state. At this time, the output voltage of the preset signal ADJ is the voltage divided by the third resistor R3 and the second resistor R2 on the input voltage DVDD (for example, a voltage of 3.3V). It is assumed that this voltage is the initial adjustment value or default adjustment value of the preset signal ADJ.

[0065] At the moment the backlight driver and light-emitting unit are powered on, if the power supply immediately receives a preset signal and reduces the voltage to 25V, the power supply voltage will have a very steep downward slope. In addition, due to the large current at the moment of power-on, the current will have a very steep upward slope. These two conditions together constitute the judgment conditions for the back-end short circuit. Therefore, the power supply will be protected, and it will be unable to provide backlight driving current to the light-emitting unit, and thus it will be impossible to turn on the machine through the remote control board.

[0066] Therefore, the present application proposes a control method for a backlight unit, which outputs a smaller current driving current according to the preset driving current sent by the backlight controller within a preset time after the backlight unit is powered on, and at the same time adjusts the backlight voltage of the light-emitting unit, thereby avoiding the occurrence of instantaneous large current when adjusting the backlight unit, and thus does not constitute the judgment condition of the back-end short circuit, so that the power supply can provide the backlight driving current for the light-emitting unit.

[0067] The following specific embodiments are used to describe the technical solution of the present application in detail. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0068] In order to facilitate understanding of the solution of the present application, the backlight unit provided in the embodiment of the present application is first described. Figure 3 As shown, the backlight unit provided in the embodiment of the present application includes:

[0069] A plurality of backlight drivers 10 are arranged in an array, and the backlight drivers 10 in the same column are cascade-connected to each other, and the first-level backlight driver 10 is connected to the backlight controller 30, and each backlight driver 10 is connected to a plurality of light-emitting units 20, which may include one or more LEDs, for example.

[0070] For example, the backlight driver in the first row serves as the first-stage backlight driver, the backlight driver in the second row serves as the second-stage backlight driver, and so on. The backlight driver in the M-1th row serves as the M-1th-stage backlight driver, and the backlight driver in the Mth row serves as the Mth-stage backlight driver. Taking the backlight driver in the first column as an example, the first-stage backlight driver is connected to the second-stage backlight driver, the second-stage backlight driver is connected to the third-stage backlight driver, and so on. The backlight driver in the (M-1)th stage is connected to the Mth-stage backlight driver.

[0071] The backlight controller 30 is further connected to the power supply 40 and controls the output voltage of the power supply 40 by sending a preset signal ADJ to the power supply 40 . When the preset signal ADJ is at different voltage values, the output voltage of the power supply 40 is different.

[0072] Next, a control method of a backlight unit provided in an embodiment of the present application is described. The control method of the backlight unit is applicable to any backlight driver in the backlight unit.

[0073] like Figure 4 As shown, the control method of the backlight unit provided in the embodiment of the present application includes:

[0074] S101. Within a preset time after the backlight unit is powered on, the backlight driver outputs a current driving current according to a preset driving current sent by the backlight controller, and adjusts the backlight voltage of the light-emitting unit to a preset voltage range, and the current driving current is less than the preset driving current.

[0075] The backlight unit powering on may include powering on a backlight driver and powering on a light emitting unit. The backlight driver powering on may include the backlight driver receiving a power supply voltage, and the light emitting unit powering on may include the light emitting unit receiving a power supply voltage.

[0076] Because the positive electrode of the light-emitting unit is connected to the power supply and receives the power voltage provided by the power supply, and the negative electrode of the light-emitting unit is connected to the backlight driver, the backlight driver controls the backlight drive current of the light-emitting unit. The preset drive current can be the drive current corresponding to the light-emitting unit under normal display conditions in the current frame. Different frames can have different preset drive currents.

[0077] In some embodiments, within a preset time after the backlight unit is powered on, the backlight driver receives a preset driving current and a preset pulse-width modulation signal sent by the backlight controller, and then outputs a current driving current based on the preset driving current and the preset pulse-width modulation signal. For example, the preset pulse-width modulation signal has a smaller duty cycle to enable outputting a smaller current driving current, wherein the product of the preset driving current and the duty cycle of the preset pulse-width modulation signal is equal to the current driving current.

[0078] In actual applications, the backlight driver outputs the current backlight drive current to the pins connected to the light-emitting units in the backlight driver, providing the current drive current for the light-emitting units. It should be noted that due to the short power-up process, the light-emitting units are running at low current, and the brightness of the light-emitting units is barely noticeable on the display screen, which does not cause a negative experience for users.

[0079] It should be noted that if the backlight driver is a first-level backlight driver, it can directly receive the preset driving current and preset pulse width modulation signal sent by the backlight controller; if the backlight driver is a backlight driver other than the first-level backlight driver, it can receive the preset driving current and preset pulse width modulation signal sent by the backlight controller through the first-level backlight driver, and then the first-level backlight driver transmits the preset driving current and preset pulse width modulation signal backward until they are transmitted to other backlight drivers.

[0080] In other embodiments, the preset time includes n time periods, where n is an integer greater than 1. For example, within the preset time period after the backlight is powered on, a counter inside the backlight driver can count according to the frame synchronization signal, and the counted time period can be divided into multiple stages, for example, n stages.

[0081] In the first time period of n time periods, the backlight driver receives the preset driving current and m successively increasing preset reduction ratios sent by the backlight controller, where m is an integer greater than 1 and less than n-1; in the second time period to the m+1th time period of n time periods, the backlight driver outputs the corresponding target driving current based on the preset driving current and the corresponding preset reduction ratio; in the m+2th time period to the nth time period of n time periods, the backlight driver outputs the preset driving current.

[0082] Specifically, each of the second to m+1th time periods has a corresponding preset reduction ratio. In the second time period, the preset drive current is multiplied by the preset reduction ratio of the second time period to obtain the target drive current of the second time period. In the third time period, the preset drive current is multiplied by the preset reduction ratio of the third time period to obtain the target drive current of the third time period. And so on, until, in the m+1th time period, the preset drive current is multiplied by the preset reduction ratio of the m+1th time period to obtain the target drive current of the m+1th time period.

[0083] For example, if n is 9 and m is 7, the five preset reduction ratios that increase in sequence may be 0%, 2%, 10%, 25%, 40%, 60%, and 75%. Figure 5As shown, in the second stage T0, the backlight driver outputs a corresponding target driving current of 0 according to the preset driving current and the corresponding preset reduction ratio of 0%; in the third stage T1, the backlight driver outputs a corresponding target driving current of 2% of the preset driving current according to the preset driving current and the corresponding preset reduction ratio of 2%; in the fourth stage T2, the backlight driver outputs a corresponding target driving current of 10% of the preset driving current according to the preset driving current and the corresponding preset reduction ratio of 10%; in the fifth stage T3, the backlight driver outputs a corresponding target driving current of 25% of the preset driving current according to the preset driving current and the corresponding preset reduction ratio of 25%; in the sixth stage T4, the backlight driver outputs a corresponding target driving current of 40% of the preset driving current according to the preset driving current and the corresponding preset reduction ratio of 40%; in the seventh stage T5, the backlight driver outputs a corresponding target driving current of 60% of the preset driving current according to the preset driving current and the corresponding preset reduction ratio of 60%; in the eighth stage T6, the backlight driver outputs a corresponding target driving current of 75% of the preset driving current according to the preset driving current and the corresponding preset reduction ratio of 75%.

[0084] In this embodiment, in the second period to the m+1 period, the backlight current increases sequentially until it reaches the preset driving current. Correspondingly, in the m+2 period to the nth period, the preset driving current is output, thereby controlling the current rising slope when controlling power-on, and avoiding power protection caused by excessive power-on. For example, Figure 5 As shown, after the eighth stage T6, the preset driving current can be output, that is, the driving current of the light-emitting unit when the current frame is displayed normally.

[0085] In this step, a current driving current that is less than a preset driving current is output within a preset time, and at the same time, the backlight voltage of the light-emitting unit is adjusted to within a preset voltage range, thereby avoiding the occurrence of instantaneous large current when adjusting the backlight voltage, and thus not constituting the judgment condition of a back-end short circuit, so that the power supply can provide the backlight driving current for the light-emitting unit.

[0086] It should be noted that the preset voltage range may be a voltage range during the operation of the light-emitting unit, for example, may be near the rated voltage of the light-emitting unit, and may be determined according to actual conditions.

[0087] In some examples, considering that the power output is at its highest value at the moment the backlight is turned on, the output voltage of the power supply can be adjusted according to the default voltage value of the preset signal. At this time, the output voltage of the power supply is close to the backlight voltage required by the light-emitting unit, thereby ensuring the normal operation of the sending unit.

[0088] In other examples, the output voltage of the preset signal can be controlled based on the current backlight voltage of the light-emitting unit under the current driving current, thereby adjusting the output voltage of the power supply to provide the required backlight voltage for the light-emitting unit. Since the current backlight voltage of the light-emitting unit is detected by the backlight driver and fed back to the backlight controller, the current feedback voltage of the backlight driver is also the current backlight voltage of the light-emitting unit.

[0089] S102: After a preset time, the backlight driver receives a display signal sent by the backlight controller, and adjusts the brightness of the light-emitting unit according to the display signal.

[0090] In this step, after a preset time, the backlight driver receives a display signal sent by the backlight controller and adjusts the brightness of the light-emitting unit according to the display signal, so that the backlight image can be displayed normally.

[0091] In an embodiment of the present application, before receiving the display signal, the backlight voltage is adjusted to avoid a momentary decrease in the power supply voltage and a momentary increase in the current, which occur simultaneously to avoid constituting a short circuit determination condition at the back end.

[0092] The control method of the backlight unit provided in the present application outputs a smaller current driving current according to the preset driving current sent by the backlight controller within a preset time after the backlight unit is powered on, and at the same time adjusts the backlight voltage of the light-emitting unit, thereby avoiding the occurrence of instantaneous large current when adjusting the backlight unit, and thus not constituting the judgment condition of the back-end short circuit, so that the power supply can provide the backlight driving current for the backlight.

[0093] Figure 6 A control method of a backlight unit provided by an embodiment of the present application is shown. Figure 6 As shown, with the backlight driver as the execution body, the control method of the backlight unit provided by the embodiment of the present application includes:

[0094] S201. Within a preset time when the backlight unit is powered on, in a first period, the backlight driver receives a preset driving current and a preset pulse width modulation signal sent by the backlight controller, and outputs a current driving current according to the preset driving current and the preset pulse width modulation signal.

[0095] In this embodiment, the preset time includes a first time period and a second time period.

[0096] In some examples, such as Figure 7 As shown, the first time period includes a first sub-period T0 and a second sub-period T1. In the first sub-period T0, an initial configuration signal sent by the backlight controller is received. The initial configuration signal includes initial configuration information of the backlight driver. The initial configuration information may include a preset driving current and a preset pulse width modulation signal of the backlight driver.

[0097] For example, the initial configuration information also includes the address code of the backlight driver. Accordingly, the preset driving current and preset pulse width modulation signal of the backlight driver can be extracted from the initial configuration information based on the address code of the backlight driver. In actual applications, the backlight driver can receive the configuration information required for one or more displays, that is, the configuration information of one or more frames.

[0098] For example, the initial configuration signal may be 16 bits, wherein the first 4 bits or 6 bits are signals corresponding to a preset driving current, and the last 12 bits or 10 bits are preset pulse width modulation signals.

[0099] Continue to refer Figure 7 As shown, in the second sub-period T1, the preset driving current and the preset pulse width modulation signal of the backlight driver are extracted from the initial configuration information, and the current driving current is output according to the preset driving current and the preset pulse width modulation signal, that is, Figure 7 The backlight current in the second sub-period T1.

[0100] In some examples, such as Figure 7 As shown, after the backlight unit is powered on, before the preset time, the power supply can output the highest value. In the first sub-period T0 and the second sub-period T1 of the preset time, the backlight controller can also adjust the output voltage of the power supply according to the default voltage value of the preset signal, such as Figure 7 Since the current value of the current driving current output by the backlight driver is relatively small in the first sub-period T0 and the second sub-period T1, the determination condition of the rear-end short circuit is avoided.

[0101] S202 : Within a preset time period when the backlight unit is powered on, in a second period, the backlight driver sends a current feedback voltage of the backlight driver to the backlight controller.

[0102] In this embodiment, when the current feedback voltage is outside the preset voltage range, the backlight controller adjusts the output voltage of the power supply by controlling the voltage of the preset signal until the backlight voltage is within the preset voltage range.

[0103] It should be noted that within the preset time, the backlight driver always outputs the current driving current.

[0104] In this embodiment, due to the use of LED DC drive, the backlight voltage of the light-emitting unit can be detected even at low currents. Therefore, the backlight driver can detect the current backlight voltage of the light-emitting unit and send the current backlight voltage of the light-emitting unit (the current feedback voltage of the backlight driver) to the backlight controller. When the current feedback voltage is outside a preset voltage range, the backlight controller controls the voltage of a preset signal to adjust the output voltage of the power supply, thereby adjusting the current backlight voltage of the backlight unit.

[0105] For example, the current backlight voltage of the light-emitting unit can be obtained intermittently, for example, at the same time interval or at different time intervals. After each acquisition of the current backlight voltage of the light-emitting unit, the current backlight voltage of the light-emitting unit is sent to the backlight controller. When the current backlight voltage of the light-emitting unit is outside a preset voltage range, the backlight controller adjusts the output voltage of the power supply by controlling the voltage of a preset signal. Accordingly, the current backlight voltage of the light-emitting unit changes accordingly. When the current backlight voltage received by the backlight controller is within the preset voltage range, there is no need to adjust the output voltage of the power supply.

[0106] like Figure 7 As shown, in the second time period T2, the backlight driver continuously obtains the current backlight voltage of the light-emitting unit and generates the current feedback voltage of the backlight driver, so that the backlight controller continuously adjusts the voltage of the preset signal to adjust the output voltage of the power supply, thereby continuously adjusting the current backlight voltage of the light-emitting unit until the current backlight voltage of the light-emitting unit is within the preset voltage range.

[0107] For example, the current feedback voltage can be identified by 2 bits or multiple bits. For example, in the 2-bit identification, 00 indicates that the backlight voltage is too low, 01 indicates that the backlight voltage is normal, and 11 indicates that the backlight voltage is too high.

[0108] In some examples, to avoid conflicts caused by simultaneous feedback from multiple backlight drivers, the current feedback voltage of the backlight driver can be sent through the address of the backlight driver. For example, the backlight driver with address 1 sends the current feedback voltage in 1*100 time units, and the backlight driver with address 2 sends the current feedback voltage in 2*100 time units.

[0109] S203: After a preset time, the backlight driver receives a display signal sent by the backlight controller, and adjusts the brightness of the light-emitting unit according to the display signal.

[0110] The control method of the backlight unit provided in this embodiment receives the display signal after the backlight voltage reaches the required voltage, thereby avoiding power protection caused by large changes in voltage and current during the power-on process.

[0111] Figure 8 A control method of a backlight unit provided by an embodiment of the present application is shown. Figure 8 As shown, with the backlight controller as the execution body, the control method of the backlight unit provided by the embodiment of the present application includes:

[0112] S301 : Within a preset time after the backlight unit is powered on, the backlight controller sends a preset driving current to the backlight driver and adjusts the backlight voltage of the light-emitting unit to within a preset voltage range.

[0113] The backlight driver outputs a current driving current according to a preset driving current, and the current driving current is less than the preset driving current.

[0114] In some embodiments, the preset time includes a first period and a second period. During the first period, the backlight controller sends a preset driving current and a preset pulse width modulation signal to the backlight driver, and the backlight driver outputs the current driving current according to the preset driving current and the preset pulse width modulation signal. During the second period, the backlight controller receives a current feedback voltage sent by the backlight driver, where the current feedback voltage is the current backlight voltage of the light-emitting unit. When the current feedback voltage is outside a preset voltage range, the backlight controller adjusts the output voltage of the power supply by controlling the voltage of the preset signal until the current feedback voltage is within the preset voltage range.

[0115] In other embodiments, the preset time includes n time periods, where n is an integer greater than 1. In the first time period of the n time periods, the backlight controller sends a preset driving current and m successively increasing preset reduction ratios to the backlight driver, where m is an integer greater than 1 and less than n-1; the backlight driver outputs a corresponding target driving current based on the preset driving current and the corresponding preset reduction ratio in the second time period to the m+1th time period of the n time periods, and outputs the preset driving current in the m+2th time period to the nth time period of the n time periods.

[0116] In this step, within the preset time, the backlight controller also needs to adjust the backlight voltage of the light-emitting unit to within the preset voltage range, so that the backlight voltage of the light-emitting unit can be adjusted when the light-emitting unit has a smaller driving current, thereby avoiding the occurrence of instantaneous large current when adjusting the backlight unit, and thus not constituting the judgment condition of the back-end short circuit, so that the power supply can provide the backlight driving current for the backlight.

[0117] In some examples, the backlight controller can adjust the output voltage of the power supply according to the default voltage value of the preset signal, and then control the voltage of the modulation signal to adjust the output voltage of the power supply according to the current feedback voltage of the backlight driver, thereby adjusting the backlight voltage of the light-emitting unit to within the preset voltage range.

[0118] S302: After a preset time, send a display signal to the backlight driver.

[0119] In this step, after a preset time, a display signal is sent to the backlight driver, so that the backlight driver adjusts the brightness of the light-emitting unit according to the display signal, so that the backlight image can be displayed normally.

[0120] The control method of the backlight unit provided in this embodiment is that within a preset time after the backlight unit is powered on, the backlight controller sends a preset driving current to the backlight driver, so that the backlight driver can output a smaller current driving current than the preset driving current. At the same time, the backlight controller adjusts the backlight voltage of the light-emitting unit, thereby avoiding the occurrence of instantaneous large current when adjusting the backlight unit, and thus does not constitute the judgment condition of the back-end short circuit, so that the power supply can provide the backlight driving current for the backlight.

[0121] Figure 9 A control method of a backlight unit provided by an embodiment of the present application is shown. Figure 9 As shown, with the backlight controller as the execution body, the control method of the backlight unit provided by the embodiment of the present application includes:

[0122] S401 . Within a preset time after the backlight unit is powered on, in the first time period of n time periods, the backlight controller sends a preset driving current and m successively increasing preset reduction ratios to the backlight driver.

[0123] The preset time includes n time periods, where n is an integer greater than 1, and m is an integer greater than 1 and less than n-1. The duration of each time period can be the same or different.

[0124] In the second time period to the (m+1)th time period among the n time periods, the backlight driver outputs a corresponding target driving current according to a preset driving current and a corresponding preset reduction ratio.

[0125] S402 : The backlight controller adjusts the output voltage of the power supply according to the default voltage value of the preset signal in the second period to a period among the n periods, so as to adjust the backlight voltage of the light-emitting unit to within a preset voltage range.

[0126] Here, a is an integer greater than 1 and less than m.

[0127] In this embodiment, in the second period to the a period, the backlight voltage is adjusted according to the default voltage value of the preset signal. In the above embodiment, it is mentioned that the preset signal of the backlight driver is in a high impedance state (out of control state) for a period of time after power is turned on. The default voltage value of the preset signal depends on the resistance ratio, such as Figure 2 As shown, the output voltage of the power supply corresponding to the default voltage value of the preset signal is close to the backlight voltage required by the light-emitting unit. Figure 5 As shown, a is 3. In the second stage T0 and the third stage T1, the backlight controller controls the preset signal to a default voltage value so that the output voltage of the power supply is close to the backlight voltage required by the light-emitting unit.

[0128] It can be understood that since the backlight current increases successively from the second period to the a period, the original sag anomaly during the time of voltage adjustment and current rise no longer exists.

[0129] S403 . In the a+1th time period among the n time periods, receive the current feedback voltage sent by the backlight driver, and adjust the output voltage of the power supply according to the current feedback voltage so that the current feedback voltage is within a preset voltage range.

[0130] In addition, it is considered that the output voltage of the power supply corresponding to the default voltage value of the preset signal is close to the backlight voltage required by the light-emitting unit, but is not equal to the voltage required by the light-emitting unit.

[0131] Therefore, in this embodiment, the backlight voltage is fine-tuned twice by a preset signal to provide the required voltage for the light-emitting unit. Specifically, in the a+1th period, the current feedback voltage of the backlight driver is sent to the backlight controller, and the backlight controller adjusts the output voltage of the power supply by controlling the voltage of the preset signal so that the current feedback voltage is within the preset voltage range, thereby providing the required voltage for the light-emitting unit. For example, Figure 5 As shown, in the fourth stage T2, the output voltage of the power supply is increased by reducing the voltage of the preset signal.

[0132] In actual applications, in the a+1th time period, the backlight driver can continuously obtain the current backlight voltage of the light-emitting unit and generate the current feedback voltage of the backlight driver, so that the backlight controller continuously adjusts the voltage of the preset signal to adjust the output voltage of the power supply, thereby continuously adjusting the current backlight voltage of the light-emitting unit until the current backlight voltage of the light-emitting unit (current feedback voltage) is within the preset voltage range.

[0133] S404: After a preset time, the backlight controller sends a display signal to the backlight driver.

[0134] The control method of the backlight unit provided in this embodiment adjusts the output voltage of the power supply when the backlight current is small, thereby avoiding power supply protection caused by sudden and large changes in voltage and current during power-on.

[0135] Figure 10 FIG. 1 shows a schematic structural diagram of a control device for a backlight unit provided in an embodiment of the present application. Figure 10 As shown, the control device 10 of the backlight unit of this embodiment is used to implement the operation corresponding to the backlight driver in any of the above method embodiments. The control device 10 of the backlight unit of this embodiment includes:

[0136] an adjustment module 11, configured to output a current driving current according to a preset driving current sent by a backlight controller within a preset time after the backlight unit is powered on, and adjust the backlight voltage of the light-emitting unit to a preset voltage range, wherein the current driving current is less than the preset driving current;

[0137] The receiving module 12 is configured to receive a display signal sent by the backlight controller after the preset time, and adjust the brightness of the light-emitting unit according to the display signal.

[0138] The control device 10 of the backlight unit provided in the embodiment of the present application can execute the above method embodiment. Its specific implementation principles and technical effects can be found in the above method embodiment, and this embodiment will not be repeated here.

[0139] Figure 11 FIG. 1 shows a schematic structural diagram of a control device for a backlight unit provided in an embodiment of the present application. Figure 11 As shown, the control device 20 of the backlight unit of this embodiment is used to implement the operation corresponding to the backlight controller in any of the above method embodiments. The control device 20 of the backlight unit of this embodiment includes:

[0140] an adjustment module 21, configured to send a preset driving current to the backlight driver within a preset time after the backlight unit is powered on, and adjust the backlight voltage of the light-emitting unit to a preset voltage range; the backlight driver outputs a current driving current according to the preset driving current, wherein the current driving current is less than the preset driving current;

[0141] The sending module 22 is configured to send a display signal to the backlight driver after the preset time; the backlight driver adjusts the brightness of the light-emitting unit according to the display signal.

[0142] The control device 20 of the backlight unit provided in the embodiment of the present application can execute the above method embodiment. Its specific implementation principle and technical effects can be found in the above method embodiment, and this embodiment will not be repeated here.

[0143] Figure 12 FIG1 shows a hardware structure diagram of an electronic device provided by an embodiment of the present application. Figure 12 As shown, the electronic device 30 is used to implement the operations corresponding to the electronic device in any of the above method embodiments. The electronic device 30 of this embodiment may include: a memory 31, a processor 32 and a communication interface 33.

[0144] Memory 31 is used to store computer instructions. Memory 31 may include high-speed random access memory (RAM) or non-volatile memory (NVM), such as at least one disk memory. It may also be a USB flash drive, a mobile hard drive, a read-only memory, a magnetic disk, or an optical disk.

[0145] The processor 32 is configured to execute computer instructions stored in the memory to implement the methods in the above-described embodiments. For details, please refer to the relevant descriptions in the aforementioned method embodiments. The processor 32 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), etc. A general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in the present invention may be directly implemented as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor.

[0146] Optionally, the memory 31 may be independent or integrated with the processor 32 .

[0147] The communication interface 33 may be connected to the processor 32. The processor 32 may control the communication interface 33 to implement the functions of receiving and sending signals.

[0148] The electronic device provided in this embodiment can be used to execute the above method. Its implementation method and technical effect are similar, and this embodiment will not be repeated here.

[0149] The present application also provides a computer-readable storage medium, in which computer instructions are stored. When the computer instructions are executed by a processor, they are used to implement the methods provided in the various embodiments described above.

[0150] The present application also provides a computer program product, comprising computer instructions stored in a computer-readable storage medium. At least one processor of a device can read the computer instructions from the computer-readable storage medium, and at least one processor can execute the computer instructions so that the device implements the methods provided in the various embodiments described above.

[0151] An embodiment of the present application also provides a chip, which includes a memory and a processor, wherein the memory is used to store computer instructions, and the processor is used to call and execute the computer instructions from the memory, so that a device equipped with the chip executes the methods described in the various possible implementation modes above.

[0152] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of this application and are not intended to limit them. Although this application has been described in detail with reference to the aforementioned embodiments, those skilled in the art will appreciate that they may modify the technical solutions described in the aforementioned embodiments or replace some or all of the technical features therein with equivalents. However, such modifications or replacements do not deviate from the essence of the corresponding technical solutions within the scope of the various embodiments of this application.

Claims

1. A method for controlling a backlight unit, characterized in that: The backlight unit includes a plurality of backlight drivers arranged in an array, each backlight driver being connected to a light-emitting unit. The method is applicable to any backlight driver, and the method includes: outputting a current driving current according to a preset driving current sent by a backlight controller within a preset time after the backlight unit is powered on, and adjusting the backlight voltage of the light-emitting unit to be within a preset voltage range, wherein the current driving current is less than the preset driving current; wherein powering on the backlight unit includes powering on a backlight driver, wherein powering on the backlight driver is receiving a power supply voltage; After the preset time, receiving a display signal sent by the backlight controller, and adjusting the brightness of the light-emitting unit according to the display signal; The preset time includes a first time period and a second time period; Receiving a preset driving current and a preset pulse width modulation signal sent by a backlight controller, and outputting a current driving current according to the preset driving current sent by the backlight controller, specifically includes: In the first time period, receiving a preset driving current and a preset pulse width modulation signal sent by a backlight controller, and outputting a current driving current according to the preset driving current and the preset pulse width modulation signal; and adjusting the backlight voltage of the light-emitting unit to within a preset voltage range, specifically comprising: During the second period, the current feedback voltage of the backlight driver is sent to the backlight controller; when the current feedback voltage is outside the preset voltage range, the backlight controller adjusts the output voltage of the power supply by controlling the voltage of the preset signal until the current feedback voltage is within the preset voltage range.

2. A method for controlling a backlight unit, characterized in that: The backlight unit includes a plurality of backlight drivers arranged in an array, each backlight driver is connected to a light-emitting unit, and the method is used for a backlight controller, and the method includes: within a preset time after the backlight unit is powered on, sending a preset driving current to the backlight driver and adjusting the backlight voltage of the light-emitting unit to be within a preset voltage range; the backlight driver outputs a current driving current according to the preset driving current, wherein the current driving current is less than the preset driving current; After the preset time, a display signal is sent to the backlight driver; the backlight driver adjusts the brightness of the light-emitting unit according to the display signal; The preset time includes a first time period and a second time period; The sending a preset driving current to the backlight driver specifically includes: During the first period, a preset driving current and a preset pulse width modulation signal are sent to the backlight driver, and the backlight driver outputs a current driving current according to the preset driving current and the preset pulse width modulation signal; In the second period, the current feedback voltage sent by the backlight driver is received. When the current feedback voltage is outside the preset voltage range, the output voltage of the power supply is adjusted by controlling the voltage of the preset signal until the current feedback voltage is within the preset voltage range.

3. An electronic device, characterized in that: include: a processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method according to any one of claims 1 to 2.

4. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, which are used to implement the method according to any one of claims 1 to 2 when executed by a processor.

5. A computer program product comprising a computer program, which, when executed by a processor, implements the method according to any one of claims 1-2.

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