Display apparatus, control method of display apparatus, and storage medium

Abstract

The embodiment of the invention belongs to the technical field of display, and provides a display device, a control method of the display device and a storage medium, and the display device comprises a display screen, an LED, a voltage control circuit and a backlight driving assembly. Wherein the display screen is used for displaying an image, the LED is used for providing a backlight light source for the display screen when the LED is lightened, and the voltage control circuit is configured to determine the input voltage of the LED according to the first signal. And the backlight driving assembly is configured to drive the voltage control circuit to determine an input voltage within a first preset duration before the LED is lightened according to the enable signal, output a load current required for lightening the LED according to the second signal after the input voltage is determined, and drive the LED to be lightened based on the input voltage and the load current so as to enable the display screen to display an image. According to the invention, PWM dimming is realized in a time sequence mode, so that the input current of the backlight driving assembly is reduced, and the working stability of the backlight driving assembly is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of display technology, and more specifically, to a display device, a control method of the display device, and a storage medium. Background Art

[0002] Display devices usually need to rely on backlight modules to display content. Light-Emitting Diodes (LEDs) are generally used as backlight sources. The backlight dimming technologies used by display devices mainly include Pulse Width Modulation (PWM) dimming and Direct Current (DC) dimming.

[0003] At present, for PWM dimming, the enable pin of the backlight driver chip is constantly turned on and off, and the backlight brightness is adjusted by the length of the enable time. At the moment of enabling, the backlight driver chip needs to complete two parts of work: quickly establish the output voltage and output the load current required to light up the screen load, where the output voltage is the voltage that satisfies the normal lighting of the LED. However, the above work will cause the backlight driver chip to require a relatively large input current at the moment of enabling. The large input current will cause the backlight driver chip to have an overcurrent problem, resulting in unstable operation of the backlight driver chip. Summary of the invention

[0004] The embodiments of the present application provide a display device, a control method for the display device, and a storage medium, which can be used to solve the problem in the related art that a large input current during PWM dimming may cause an overcurrent problem in a backlight driver chip, thereby causing unstable operation of the backlight driver chip.

[0005] In a first aspect, an embodiment of the present application provides a display device, the display device comprising:

[0006] a display screen configured to display an image;

[0007] A light emitting diode (LED), disposed at the back of the display screen and configured as a light source for providing backlight for the display screen when lit;

[0008] a voltage control circuit connected to the LED and configured to determine an input voltage of the LED according to a first signal;

[0009] The backlight driving component is connected to the voltage control circuit and the LED respectively, and is configured as follows:

[0010] According to the enable signal, driving the voltage control circuit to determine the input voltage within a first preset time period before the LED is lit;

[0011] After determining the input voltage, outputting a load current required to light up the LED according to a second signal;

[0012] Based on the input voltage and the load current, the LED is driven to light up so that the display screen displays an image.

[0013] In this embodiment, the display device includes a display screen, an LED, a voltage control circuit, and a backlight driving component. The display screen is used to display images, the LED is used to provide a light source for backlighting the display screen when it is lit, and the voltage control circuit is configured to determine the input voltage of the LED according to a first signal. The backlight driving component is configured to: according to an enable signal, drive the voltage control circuit to determine the input voltage within a first preset time before the LED is lit, and after determining the input voltage, output the load current required to light up the LED according to a second signal, and drive the LED to light up based on the input voltage and load current so that the display screen displays an image. The present application implements PWM dimming in a timing manner, so that the input current of the backlight driving component is reduced, thereby improving the stability of the backlight driving component.

[0014] In some embodiments of the present application, the display device includes a main control component;

[0015] The main control component is connected to the backlight driving component and the voltage control circuit respectively, and the main control component is configured as follows:

[0016] sending the first signal to the voltage control circuit;

[0017] The enable signal and the second signal are sent to the backlight driving component.

[0018] In this embodiment, the first signal, the enable signal and the second signal may be sent by the main control component to implement PMW dimming of the display screen.

[0019] In some embodiments of the present application, the main control component is configured as follows:

[0020] Obtaining the first preset duration, the refresh rate of the display screen, the inversion duration of the liquid crystal molecules, and the backlight brightness;

[0021] The enable signal is determined based on the first preset duration, the refresh rate, the inversion duration and the backlight brightness, and the high level start time of the enable signal is earlier than the high level start time of the first signal by the first preset time, so that the backlight drive component determines the input voltage within the first preset time before the LED is lit.

[0022] In this embodiment, when determining the enable signal, the main control component can determine the enable signal based on the time required to determine the input voltage of the LED (i.e., the first preset time), so as to enable the backlight drive component to determine the input voltage in advance, i.e., determine the input voltage within the first preset time before the LED is lit.

[0023] In some embodiments of the present application, the voltage control circuit includes a first resistor, a second resistor and a first switch;

[0024] The first switch and the second resistor are connected in series, and the first resistor is connected in parallel with the first switch and the second resistor connected in series to form the voltage control circuit; a first end of the voltage control circuit is connected to the LED, and a second end of the voltage control circuit is connected to the backlight driving component;

[0025] The first switch is connected to the main control component, and the main control component is configured to send the first signal to the first switch;

[0026] Wherein, the resistance value of the first resistor is greater than the resistance value of the second resistor.

[0027] In this embodiment, the input voltage of the LED can be controlled through the specific structure of the voltage control circuit.

[0028] In some embodiments of the present application, the main control component is configured to: control the first signal to be at a low level within the first preset time length, and control the duty cycle of the second signal within the first preset time length to be a first duty cycle;

[0029] The voltage control circuit is configured to: when the first signal is at a low level, control the state of the first switch to be an off state, and determine the input voltage through the voltage of the first resistor and the voltage of the LED;

[0030] The backlight driving component is configured as follows:

[0031] According to a second signal corresponding to the first duty cycle, controlling the current of the LED to be a first current, where the first current is an abnormal working current of the LED;

[0032] The first current is output.

[0033] In this embodiment, within a first preset time period before lighting the LED, the input voltage can be determined according to a first signal determined by the main control component, and then the current of the LED during this period is controlled to be a low current according to a second signal determined by the main control component, thereby controlling the input voltage of the LED when it is not lit.

[0034] In some embodiments of the present application, the main control component is configured to: after determining the input voltage, control the first signal to be at a high level within a second preset time length, and control the duty cycle of the second signal within the second preset time length to be a second duty cycle;

[0035] The voltage control circuit is configured to: when the first signal is at a high level, control the state of the first switch to be a closed state, so that the input voltage acts on the LED;

[0036] The backlight driving component is configured as follows:

[0037] According to the second signal of the second duty cycle, controlling the load current to be a second current, where the second current is a normal working current of the LED;

[0038] The second current is output.

[0039] In this embodiment, within the second preset time period after the input voltage is determined, the determined input voltage can be applied to the LED according to the first signal determined by the main control component, and then according to the second signal determined by the main control component, the load current is input to the LED during this period to light up the LED.

[0040] In some embodiments of the present application, the main control component is configured as follows:

[0041] After the LED is lit for the second preset time, the enable signal is controlled to be at a low level, the duty cycle of the second signal is controlled to be the first duty cycle, and the first signal is controlled to be at a low level, so as to turn off the LED.

[0042] In this embodiment, after the LED is lit for a period of time, the LED can be turned off by controlling the enable signal and the first signal to be at a low level and controlling the duty cycle of the second signal.

[0043] In a second aspect, the present application provides a display device, the display device comprising:

[0044] a display screen configured to display an image;

[0045] An LED, disposed at the back of the display screen and configured as a light source for providing backlight for the display screen when lit;

[0046] The backlight driving assembly, connected with the LED, is configured as follows:

[0047] Before lighting the LED, determining an input voltage of the LED;

[0048] After determining the input voltage, outputting a load current required to light up the LED;

[0049] Based on the input voltage and the load current, the LED is driven to light up so that the display screen displays an image.

[0050] In this embodiment, the display device includes a display screen, an LED, and a backlight driving component. The display screen is used to display images, the LED is used to provide a backlight light source for the display screen when it is lit, and the backlight driving component is configured to determine the input voltage of the LED before lighting the LED, and after determining the input voltage, output the load current required to light up the LED, and drive the LED to light up based on the input voltage and the load current, so that the display screen displays an image. The present application implements PWM dimming in a timing manner, so that the input current of the backlight driving component is reduced, thereby improving the stability of the backlight driving component.

[0051] In a third aspect, the present application provides a method for controlling a display device, the display device comprising:

[0052] a display screen configured to display an image;

[0053] A light emitting diode (LED), disposed at the back of the display screen and configured as a light source for providing backlight for the display screen when lit;

[0054] a voltage control circuit connected to the LED;

[0055] The method comprises:

[0056] According to the enable signal, the voltage control circuit is driven to determine the input voltage of the LED according to the first signal within a first preset time period before the LED of the display screen is lit;

[0057] After determining the input voltage, outputting a load current required to light up the LED according to a second signal;

[0058] Based on the input voltage and the load current, the LED is driven to light up so that the display screen displays an image.

[0059] In this embodiment, according to the enable signal, the driving voltage control circuit determines the input voltage according to the first signal within the first preset time before the LED of the display screen is lit, and after determining the input voltage, outputs the load current required to light up the LED according to the second signal, and drives the LED to light up based on the input voltage and the load current, so that the display screen displays an image. PWM dimming is achieved by timing, so that the input current of the backlight driving component of the display device is reduced, and the stability of the operation of the backlight driving component is improved.

[0060] In a fourth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a computer, they are used to implement the method described in the third aspect.

[0061] The computer-readable storage medium provided in the embodiment of the present application can execute the technical solution in the above method embodiment, and its beneficial effects are similar, which will not be repeated here.

[0062] In a fifth aspect, the present application provides a computer program product, including a computer program, which is used to implement the method described in the third aspect when executed by a computer.

[0063] The computer program product provided in the embodiment of the present application can execute the technical solution in the above method embodiment, and its beneficial effects are similar and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the implementation methods in the embodiments of the present application or the related technologies, the following is a brief introduction to the drawings required for use in the embodiments or the related technology descriptions. Obviously, the drawings described below are some embodiments of the present application, and a person skilled in the art can also obtain other drawings based on these drawings.

[0065] Figure 1 A schematic diagram of the structure of a display device provided in an embodiment of the present application;

[0066] Figure 2 This is a schematic diagram of an LED 102 according to an example of the present application being disposed on the back of a display screen 101;

[0067] Figure 3 A schematic diagram of the structure of another display device provided in an embodiment of the present application;

[0068] Figure 4 A waveform diagram of a first signal and an enable signal of an example of the present application;

[0069] Figure 5 A schematic diagram of a circuit structure of a display device provided in an embodiment of the present application;

[0070] Figure 6 is a curve diagram showing the change of the input voltage of LED 102 along with the current flowing through LED 102;

[0071] Figure 7 A schematic flow chart of a method for controlling a display device provided in an embodiment of the present application;

[0072] Figure 8 A schematic diagram of the structure of another display device provided in an embodiment of the present application;

[0073] Fig. 9 A schematic diagram of the structure of another display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0074] In order to make the purpose, implementation mode and advantages of the present application clearer, the exemplary implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0075] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their common and usual meanings.

[0076] In addition, the terms "include" and "have" and any variations thereof are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to those components expressly listed but may include other components not expressly listed or inherent to such products or devices.

[0077] For display devices that rely on backlight modules to display content, LEDs are usually used as backlight sources, so it is necessary to adjust the backlight. At present, the main backlight adjustment technologies are PWM dimming and DC dimming. Among them, DC dimming directly adjusts the brightness of the backlight by controlling the size of the voltage, which will not cause the screen to flicker, but the cost is high. In PWM dimming, the brightness of the backlight is actually fixed. The enable pin of the backlight driver chip is constantly turned on and off. The backlight brightness is adjusted by the length of the enable time, that is, the screen brightness is adjusted by controlling the length of time for periodically turning on and off the backlight. For example, to display 75% brightness, that is, in each very short period of time, the backlight is turned on for 75% of the time and turned off for 25% of the time. Due to the visual persistence effect of the human eye, the screen will appear to the naked eye as being on at 75% brightness, but in fact it is flashing quickly in the order of on-off-on-off at 100% brightness.

[0078] At the moment of enabling, the backlight driver chip needs to complete two parts of work: quickly build up the output voltage and output the load current required to light up the screen load, where the output voltage is the voltage required to light up the LED normally. However, the above work will cause the backlight driver chip to require a relatively large input current at the moment of enabling. The large input current will cause the backlight driver chip to have an overcurrent problem, which will cause the backlight driver chip to work unstably.

[0079] Therefore, the present application provides a display device, which determines the input voltage of the LED before lighting the LED, and after determining the input voltage, outputs the load current required to light the LED, so as to realize PWM dimming in a timing manner, thereby reducing the input current of the backlight driving component and improving the working stability of the backlight driving component.

[0080] It can be understood that in the embodiments of the present application, the display device may be a virtual reality (VR) device, or other display device using PWM dimming, and the present application does not limit this.

[0081] The technical solution of the present application is described in detail below in conjunction with specific embodiments. The following specific embodiments can be combined with each other or exist independently. The same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0082] Figure 1 A schematic diagram of a display device provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the display device 10 includes a display screen 101 ( Figure 1 ), LED 102, voltage control circuit 103 and backlight driving component 104.

[0083] The display screen 101 is configured to display images. Specifically, the display screen 101 can display images when the LED 102 is turned on.

[0084] LED 102 is disposed on the back of display screen 101, and LED 102 is configured as a light source for providing backlight for display screen 101 when it is turned on. Figure 2 This is a schematic diagram of an LED 102 of the present application being arranged on the back of the display screen 101. It can be understood that Figure 2 The number of LEDs in is only an example.

[0085] The voltage control circuit 103 is connected to the LED 102 , and is configured to determine an input voltage of the LED 102 according to the first signal.

[0086] The backlight driving component 104 is connected to the voltage control circuit 103 and the LED 102 respectively. The backlight driving component 104 is configured as follows:

[0087] According to the enable signal, the driving voltage control circuit 103 determines the input voltage within a first preset time period before the LED 102 is lit. After determining the input voltage, according to the second signal, the driving voltage control circuit 103 outputs the load current required to light up the LED 102. Based on the input voltage and the load current, the LED 102 is driven to light up so that the display screen 101 displays an image.

[0088] Exemplarily, the backlight driving component 104 may be a backlight driving chip of the display device 10 .

[0089] In this embodiment, the display device includes a display screen 101, an LED 102, a voltage control circuit 103, and a backlight driving component 104. Among them, the display screen 101 is used to display images, and the LED 102 is used to provide a backlight light source for the display screen 101 when it is lit. The voltage control circuit 103 is configured to determine the input voltage of the LED 102 according to a first signal. The backlight driving component 104 is configured to: according to an enable signal, drive the voltage control circuit 103 to determine the input voltage within a first preset time before the LED 102 is lit, and after determining the input voltage, output the load current required to light up the LED 102 according to a second signal, and drive the LED 102 to light up based on the input voltage and the load current, so that the display screen 101 displays an image. The present application implements PWM dimming in a timing manner, so that the input current of the backlight driving component 104 is reduced, thereby improving the working stability of the backlight driving component 104.

[0090] In a possible implementation, the first signal, the enable signal, and the second signal may be sent by a main control component in the display device 10 .

[0091] Figure 3 A schematic diagram of the structure of another display device provided in an embodiment of the present application, such as Figure 3 As shown, the display device 10 further includes a main control component 105, which is connected to the backlight driving component 104 and the voltage control circuit 103 respectively, and the main control component 105 is configured as follows:

[0092] A first signal is sent to the voltage control circuit 103 .

[0093] The enable signal and the second signal are sent to the backlight driving component 104 .

[0094] The first signal is used to determine the input voltage of LED 102 , the enable signal is used to instruct the voltage control circuit 103 to determine the input voltage within a first preset time before LED 102 is lit, and the second signal is used to drive the backlight driving component 104 to output the load current required to light up the display screen 101 .

[0095] Exemplarily, the main control component 105 may be a central processing unit (CPU), and the PWM dimming of the display screen 101 may be controlled by the CPU.

[0096] In a possible implementation, the main control component 105 may determine the enable signal in the following manner:

[0097] The first preset duration, the refresh rate of the display screen 101, the inversion duration of the liquid crystal molecules, and the backlight brightness are obtained.

[0098] An enable signal is determined based on the first preset duration, refresh rate, inversion duration and backlight brightness, and the high level start time of the enable signal is earlier than the high level start time of the first signal by a first preset duration, so that the backlight drive component 104 determines the input voltage within the first preset duration before LED 102 is lit.

[0099] Specifically, the main control component 105 can determine the high level start time and high level width of the enable signal according to the first preset duration, refresh rate, inversion duration and backlight brightness.

[0100] For example, Figure 4 The waveform diagram of the first signal and the enable signal of the present application example, in which T1 is the first preset time length, Figure 4 It can be seen that the high level start time of the enable signal is earlier than the high level start time of the first signal by a first preset time duration. During the first preset time duration, the first signal is at a low level, so that the voltage control circuit 103 can control the voltage value of the voltage control circuit 103 to increase according to the first signal, so that the resistance value reaches the input voltage at which the LED 102 can light up normally.

[0101] That is, the main control component 105 can determine the enable signal based on the time required to determine the input voltage of the LED 102 (ie, the first preset time), so as to enable the backlight driving component 104 to determine the input voltage in advance.

[0102] Next, the structure of the voltage control circuit 103 will be described in detail.

[0103] Figure 5 A schematic diagram of a circuit structure of a display device provided in an embodiment of the present application is shown in FIG. Figure 5 As shown, the voltage control circuit 103 includes a first resistor, a second resistor and a first switch.

[0104] The first switch and the second resistor are connected in series, and the first resistor is connected in parallel with the first switch and the second resistor connected in series to form a voltage control circuit 103. The first end of the voltage control circuit 103 is connected to the LED 102, and the second end of the voltage control circuit 103 is connected to the backlight driving component 104. Specifically, the LED 102 is connected to the voltage output interface (VOUT) of the backlight driving component 104, and the second end of the voltage control circuit 103 is connected to the feedback pin (feedback, FB) of the backlight driving component 104. The second end of the voltage control circuit 103 is also grounded through the resistor R1. Figure 5 1 represents the first end and 2 represents the second end.

[0105] The first switch is connected to the main control component 105, and the main control component 105 is configured to send a first signal to the first switch.

[0106] Among them, the resistance value of the first resistor is greater than the resistance value of the second resistor. When the first switch is disconnected, current flows through the first resistor, so that the voltage of the first resistor will be larger. When the first switch is closed, the first resistor and the second resistor are both connected to the circuit, so that the impedance of the voltage control circuit 103 after parallel connection is smaller.

[0107] exist Figure 5 In the embodiment, the second signal is input through the high-frequency pulse width modulation (HIGH-Frequency Pulse Width Modulation, PWMH) interface of the backlight driving component 104, the enable signal is input through the low-frequency pulse width modulation (LOW-Frequency Pulse Width Modulation, PWML) interface of the backlight driving component 104, the GND interface represents grounding, and the switching frequency setting pin (Frequency, FREQ) interface is grounded through the resistor R2. It can be understood that for Figure 5 The circuit structure not described in the circuit is the required structure of the circuit, which can be referred to Figure 5 The input voltage of the LED 102 can be controlled by the voltage control circuit 103 .

[0108] Specific:

[0109] The main control component 105 is configured to: control the first signal to be at a low level within a first preset time period, and control the duty cycle of the second signal within the first preset time period to be a first duty cycle, wherein the high level corresponding to the first duty cycle accounts for a smaller proportion, so that the current passing through LED 102 is lower, and the display screen 101 appears black to the human eye at this time, that is, the high level proportion corresponding to the first duty cycle can prevent the current passing through LED 102 from lighting up LED 102.

[0110] The voltage control circuit 103 is configured as follows: when the first signal is at a low level, the state of the first switch is controlled to be an off state, and the input voltage is determined by the voltage of the first resistor and the voltage of LED 102. That is, when the first signal is at a low level, the first switch is disconnected so that the current only passes through the first resistor with a larger resistance value, which will increase the voltage of the first resistor, thereby adding the voltage of the first resistor to the smaller voltage of LED 102 to obtain the input voltage of LED 102, which is a voltage that can make LED 102 light up normally.

[0111] During the first preset time period, the backlight driving component 104 is configured to:

[0112] According to the second signal corresponding to the first duty cycle, the current of LED 102 is controlled to be a first current, the first current is an abnormal operating current of LED 102, and the first current is output, that is, the first current cannot light up LED 102 normally.

[0113] In this embodiment, within a first preset time period before lighting up LED 102, the input voltage can be determined according to a first signal determined by the main control component 105, and then the current of LED 102 during this period is controlled to be a low current according to a second signal determined by the main control component 105, thereby controlling the input voltage of LED 102 when it is not lit.

[0114] After determining the input voltage of LED 102, the backlight driving component 104 can output the load current required to light up LED 102. Specifically, it can be based on Figure 5 The voltage control circuit 103 realizes:

[0115] The main control component 105 is configured to: after determining the input voltage, control the first signal to be high level within a second preset time period, and control the duty cycle of the second signal within the second preset time period to be a second duty cycle, that is, when the first signal is high level, the first switch is closed to connect the second resistor to the circuit, so that the impedance of the first resistor and the second resistor connected in parallel is reduced, so that the output voltage of the backlight driving component 104 (that is, the input voltage of LED102) acts on LED102.

[0116] The backlight driving component 104 is configured as follows:

[0117] According to the second signal of the second duty cycle, the load current required to light up the LED 102 is controlled to be the second current, the second current is the normal working current of the LED 102, and the second current is output. That is, the high level corresponding to the second duty cycle accounts for a larger proportion, so that the current passing through the LED 102 is increased, so as to output the current that can light up the LED 102, that is, the high level proportion corresponding to the second duty cycle can make the current passing through the LED 102 light up the LED 102.

[0118] For example, Figure 6 FIG. 1 is a schematic diagram of a curve showing that the input voltage of the LED 102 varies with the current flowing through the LED 102 .

[0119] In this embodiment, within the second preset time period after the input voltage is determined, the determined input voltage can be applied to LED 102 according to the first signal determined by the main control component 105, and then according to the second signal determined by the main control component 105, a load current is input to LED 102 during this period to light up LED 102.

[0120] It can be understood that within a PWM dimming cycle, after LED 102 is lit for the second preset time, LED 102 can be controlled to be turned off. Specifically, Figure 5 The voltage control circuit 103 realizes:

[0121] The main control component 105 is configured to:

[0122] After the LED 102 is lit for the second preset time, the enable signal is controlled to be at a low level, the duty cycle of the second signal is controlled to be the first duty cycle, and the first signal is controlled to be at a low level, so that the LED 102 is turned off.

[0123] That is, when the second preset time duration of lighting up the LED 102 is completed, the enable signal can be controlled to be at a low level within the third preset time duration, indicating that within the third preset time duration, the backlight driving component 104 does not need to output the input voltage of the LED 102. The high level corresponding to the first duty cycle accounts for a smaller proportion, so that the current passing through the LED 102 is lower, and the current passing through the LED 102 can make it impossible to light up the LED 102.

[0124] like Figure 4 As shown, T2 is the second preset duration, T3 is the third preset duration, and T1+T2+T3=one PWM dimming cycle.

[0125] Based on the above display device 10, Figure 7 A flow chart of a control method for a display device provided in an embodiment of the present application can be executed by the backlight driving component 104, such as Figure 7 As shown, the method comprises the following steps:

[0126] S701 . According to an enable signal, a driving voltage control circuit determines an input voltage according to a first signal within a first preset time period before an LED of a display screen is lit.

[0127] S702: After determining the input voltage, output a load current required to light up the LED according to the second signal.

[0128] S703 . Based on the input voltage and the load current, drive the LED to light up so that the display screen displays an image.

[0129] For the specific implementation of each of the above steps, reference may be made to the above embodiments, which will not be described in detail here.

[0130] In this embodiment, according to the enable signal, the driving voltage control circuit determines the input voltage according to the first signal within the first preset time before the LED of the display screen is lit, and after determining the input voltage, outputs the load current required to light up the LED according to the second signal, and drives the LED to light up based on the input voltage and the load current, so that the display screen displays an image. PWM dimming is achieved by timing, so that the input current of the backlight driving component of the display device is reduced, and the stability of the operation of the backlight driving component is improved.

[0131] In a possible implementation, if the display device 10 is a VR device, Figure 8 A schematic diagram of the structure of another display device provided in an embodiment of the present application, such as Figure 8 As shown, the display device 10 includes a display screen 101 , an LED 102 , a voltage control circuit 103 , a backlight driving component 104 and a main control component 105 .

[0132] The main control component 105 is connected to the display screen 101 via a digital switch interface (DSI), and the display screen 101 can be connected to the backlight driving component 104. Exemplarily, the display screen 101 can be a liquid crystal display (LCD).

[0133] The main control component 105 is also connected to the backlight driving component 104 via a PWM interface, and connected to the voltage control circuit 103 via a general-purpose input / output (GPIO) interface.

[0134] The main control component 105 can also be connected to a power source through a power interface (Power) to realize power supply for the main control component 105, connected to a camera through a serial camera interface (Camera Serial Interface, CSI), connected to an audio peripheral through an audio interface (Sound Wire, SWR), connected to a universal flash storage (Universal Flash Storage, UFS) interface, connected to a low power double data rate memory (Low Power Double Data Rate SDRAM, LPDDR5) through an external bus interface (External Bus Interface, EBI), connected to a sensor through a serial peripheral interface (Serial Peripheral Interface, SPI), connected to an industrial, scientific, and medical (Industrial Scientific Medical, ISM) chip through an SPI and a universal asynchronous receiver / transmitter (UART) interface, and connected to a high-speed serial computer expansion bus standard (Peripheral Component Interconnect Express, PCIE) interface, a UART interface, and a serial low-power chip-to-chip media bus (Serial Low-power Inter-chip Media The communication module is connected to a communication module via a SLIMBUS (SLIMBUS) interface, such as Bluetooth or Wireless Fidelity (WIFI).

[0135] Fig. 9 A structural schematic diagram of another display device provided in an embodiment of the present application, the display device 200 includes a tuner-demodulator 210, a communicator 220, a detector 230, an external device interface 240, a controller 250, a display 260, an audio output interface 270, a memory, a power supply, and at least one of a user interface.

[0136] In some embodiments, the controller includes a processor, a video processor, an audio processor, a graphics processing unit (GPU), a RAM Random Access Memory (RAM), a ROM (Read-Only Memory, ROM), and a first interface to an nth interface for input / output.

[0137] The display 260 includes a display screen component for presenting images, and a driving component for driving image display, a component for receiving image signals output from a controller, and a component for displaying video content, image content, and a menu control interface, as well as a user control user interface (UI).

[0138] The display 260 may be a liquid crystal display, an organic light-emitting diode (OLED) display, and a projection display, and may also be a projection device and a projection screen.

[0139] The communicator 220 is a component for communicating with an external device or server according to various communication protocol types. For example, the communicator may include at least one of a WIFI module, a Bluetooth module, a wired Ethernet module, and other network communication protocol chips or a near field communication protocol chip, and an infrared receiver. The display device 200 can establish transmission and reception of control signals and data signals with the external control device 100 or the server 400 through the communicator 220.

[0140] The user interface can be used to receive control signals from the control device 100 (such as an infrared remote controller, etc.).

[0141] The detector 230 is used to collect signals from the external environment or the external interaction. For example, the detector 230 includes a light receiver, a sensor for collecting the intensity of ambient light; or, the detector 230 includes an image collector, such as a camera, which can be used to collect external environment scenes, user attributes or user interaction gestures; or, the detector 230 includes a sound collector, such as a microphone, etc., for receiving external sounds.

[0142] The external device interface 240 may include, but is not limited to, any one or more of the following: a high definition multimedia interface (HDMI), an analog or digital high definition component input interface (component), a composite video input interface (CVBS), a universal serial bus (USB), a red green blue (RGB) color mode port, etc. It may also be a composite input / output interface formed by the above multiple interfaces.

[0143] The tuner-demodulator 210 receives broadcast television signals via wired or wireless reception, and demodulates audio and video signals, such as Electronic Program Guide (EPG) data signals, from a plurality of wireless or wired broadcast television signals.

[0144] In some embodiments, the controller 250 and the tuner-demodulator 210 may be located in different separate devices, that is, the tuner-demodulator 210 may also be located in an external device of the main device where the controller 250 is located, such as an external set-top box.

[0145] The controller 250 controls the operation of the display device and responds to user operations through various software control programs stored in the memory. The controller 250 controls the overall operation of the display device 200. For example, in response to receiving a user command for selecting a UI object to be displayed on the display 260, the controller 250 can perform operations related to the object selected by the user command.

[0146] In some embodiments, the controller includes a central processing unit (CPU), a video processor, an audio processor, a graphics processing unit (GPU), RAM Random Access Memory (RAM), ROM (Read-Only Memory, ROM), a first interface to an nth interface for input / output, a communication bus (Bus), etc.

[0147] The user may input a user command in a graphical user interface (GUI) displayed on the display 260, and the user input interface receives the user input command through the GUI. Alternatively, the user may input a user command by inputting a specific sound or gesture, and the user input interface recognizes the sound or gesture through a sensor to receive the user input command.

[0148] "User interface" is the medium interface for interaction and information exchange between applications or operating systems and users. It realizes the conversion between the internal form of information and the form acceptable to users. The commonly used form of user interface is GUI, which refers to the user interface related to computer operation displayed in a graphical way. It can be an interface element such as an icon, window, control, etc. displayed on the display screen of an electronic device, where the control can include icons, buttons, menus, tabs, text boxes, dialog boxes, status bars, navigation bars, etc. Visual interface elements.

[0149] The display device provided in the embodiments of the present application may have various implementation forms, for example, it may be a television, a smart television, a laser projection device, a monitor, an electronic bulletin board, an electronic table, etc. Figure 7 and Figure 8This is a specific implementation of the display device of the present application.

[0150] The present application also provides a computer-readable storage medium, which may include: a U disk, a mobile hard disk, a ROM, a RAM, a disk or an optical disk, and other media that can store program codes. Specifically, the computer-readable storage medium stores computer execution instructions, and when the computer execution instructions are executed by a computer, they are used to implement the technical solution shown in the above method embodiment.

[0151] The present application also provides a program product, which includes execution instructions stored in a readable storage medium. When the computer program is executed by a computer, the technical solution shown in the above method embodiment is executed. The specific implementation method and technical effect are similar and will not be repeated here.

[0152] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0153] For ease of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are intended to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

[0154] In this application, "multiple" means two or more. The first, second, etc. descriptions that appear in the embodiments of this application are only used for illustration and distinction of the described objects. There is no order, nor does it represent a special limitation on the number of devices in the embodiments of this application, and cannot constitute any limitation on the embodiments of this application. For example, the first threshold and the second threshold are only used to distinguish different thresholds, and do not represent the difference in size, priority, or importance of the two thresholds.

[0155] In this application, "exemplary", "in some embodiments", "in other embodiments", etc. are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" in this application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the word "exemplary" is intended to present concepts in a concrete way.

[0156] In this application, "of", "corresponding, relevant", "corresponding", and "associated" can sometimes be used interchangeably. It should be noted that when the distinction is not emphasized, the meanings they express are consistent. In the embodiments of this application, communication and transmission can sometimes be used interchangeably. It should be noted that when the distinction is not emphasized, the meanings they express are consistent. For example, transmission can include sending and / or receiving, which can be a noun or a verb.

Claims

1. A display device, characterized in that: The display device comprises: a display screen configured to display an image; A light emitting diode (LED), disposed at the back of the display screen and configured as a light source for providing backlight for the display screen when lit; a voltage control circuit connected to the LED and configured to determine an input voltage of the LED according to a first signal; The backlight driving component is connected to the voltage control circuit and the LED respectively, and is configured as follows: According to the enable signal, driving the voltage control circuit to determine the input voltage within a first preset time period before the LED is lit; After determining the input voltage, outputting a load current required to light up the LED according to a second signal; Based on the input voltage and the load current, the LED is driven to light up so that the display screen displays an image.

2. The display device according to claim 1, characterized in that The display device includes a main control component; The main control component is connected to the backlight driving component and the voltage control circuit respectively, and the main control component is configured as follows: sending the first signal to the voltage control circuit; The enable signal and the second signal are sent to the backlight driving component.

3. The display device according to claim 2, characterized in that The main control component is configured as follows: Obtaining the first preset duration, the refresh rate of the display screen, the inversion duration of the liquid crystal molecules, and the backlight brightness; The enable signal is determined based on the first preset duration, the refresh rate, the inversion duration and the backlight brightness, and the high level start time of the enable signal is earlier than the high level start time of the first signal by the first preset time, so that the backlight drive component determines the input voltage within the first preset time before the LED is lit.

4. The display device according to claim 2 or 3, characterized in that: The voltage control circuit includes a first resistor, a second resistor and a first switch; The first switch and the second resistor are connected in series, and the first resistor is connected in parallel with the first switch and the second resistor connected in series to form the voltage control circuit; a first end of the voltage control circuit is connected to the LED, and a second end of the voltage control circuit is connected to the backlight driving component; The first switch is connected to the main control component, and the main control component is configured to send the first signal to the first switch; Wherein, the resistance value of the first resistor is greater than the resistance value of the second resistor.

5. The display device according to claim 4, characterized in that The main control component is configured to: control the first signal to be at a low level within the first preset time length, and control the duty cycle of the second signal within the first preset time length to be a first duty cycle; The voltage control circuit is configured to: when the first signal is at a low level, control the state of the first switch to be an off state, and determine the input voltage through the voltage of the first resistor and the voltage of the LED; The backlight driving component is configured as follows: According to a second signal corresponding to the first duty cycle, controlling the current of the LED to be a first current, where the first current is an abnormal working current of the LED; The first current is output.

6. The display device according to claim 5, characterized in that The main control component is configured to: after determining the input voltage, control the first signal to be at a high level within a second preset time length, and control the duty cycle of the second signal within the second preset time length to be a second duty cycle; The voltage control circuit is configured to: when the first signal is at a high level, control the state of the first switch to be a closed state, so that the input voltage acts on the LED; The backlight driving component is configured as follows: According to the second signal of the second duty cycle, controlling the load current to be a second current, where the second current is a normal working current of the LED; The second current is output.

7. The display device according to claim 6, characterized in that The main control component is configured as follows: After the LED is lit for the second preset time, the enable signal is controlled to be at a low level, the duty cycle of the second signal is controlled to be the first duty cycle, and the first signal is controlled to be at a low level, so as to turn off the LED.

8. A display device, characterized in that: The display device comprises: a display screen configured to display an image; An LED, disposed at the back of the display screen and configured as a light source for providing backlight for the display screen when lit; The backlight driving assembly, connected with the LED, is configured as follows: Before lighting the LED, determining an input voltage of the LED; After determining the input voltage, outputting a load current required to light up the LED; Based on the input voltage and the load current, the LED is driven to light up so that the display screen displays an image.

9. A method for controlling a display device, characterized in that: The display device comprises: a display screen configured to display an image; A light emitting diode (LED), disposed at the back of the display screen and configured as a light source for providing backlight for the display screen when lit; a voltage control circuit connected to the LED; The method comprises: According to the enable signal, the voltage control circuit is driven to determine the input voltage of the LED according to the first signal within a first preset time period before the LED of the display screen is lit; After determining the input voltage, outputting a load current required to light up the LED according to a second signal; Based on the input voltage and the load current, the LED is driven to light up so that the display screen displays an image.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, the method of claim 9 is implemented.

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