Display device and control method thereof

Abstract

The present application provides a display device and a control method thereof, which adjusts the voltage output to the LED light string array by the controller power supply circuit, and detects the actual operating current of the LED light string array by the current detection circuit, thereby more accurately determining the actual operating voltage of the LED light string array according to the change of the actual operating current, and setting the voltage output by the power supply circuit according to the actual operating voltage, thereby reducing the invalid voltage output by the power supply circuit and reducing the energy consumption of the display device.

Description

Technical Field

[0001] The present application relates to the technical field of display devices, and more particularly to a display apparatus and a control method thereof. Background Art

[0002] With the advancement of electronic technology, the integration of displays such as outdoor LED and Micro LED displays is becoming increasingly complex, placing increasing demands on the power modules of these display devices. Currently, the power modules of most display devices receive AC power through a plug, then use a dedicated power supply circuit to convert the AC power to DC and transform the voltage before powering the LED light strings within the display.

[0003] In related technologies, a power supply circuit supplies power to an LED driving circuit, which then drives an LED light string array to illuminate a display panel. The voltage value provided by the power supply circuit is set based on empirical estimates of specification parameters such as the rated operating voltage of the LED light string.

[0004] When using related technologies, there is a large gap between the voltage set based on empirical estimation and the actual operating voltage of the LED light string array, so that a large amount of invalid voltage is converted into heat loss of the display device, thereby increasing the energy consumption of the display device. Summary of the Invention

[0005] The present application provides a display device and a control method thereof, which can more accurately determine the actual operating voltage of an LED light string array and set the voltage output by a power supply circuit according to the actual operating voltage, thereby reducing the invalid voltage output by the power supply circuit and reducing the energy consumption of the display device.

[0006] The present application provides a display device, comprising: a display panel configured to display an image; an LED driving circuit configured to drive an LED light string array to illuminate the display panel, wherein the LED light string array includes multiple Mini LED light strings or multiple Micro LED light strings; a power supply circuit configured to, when the display device is in a first operating mode, use a target voltage determined by the controller to supply power to the LED driving circuit; and a controller configured to, when the display device is in a second operating mode, control the power supply circuit to output a voltage within a preset range when supplying power to the LED driving circuit, collect an actual operating current range of the LED light string array, and determine a target voltage corresponding to a preset current in the actual operating current range.

[0007] In an embodiment of the first aspect of the present application, the preset current includes: a first current value; wherein the first current value is the sum of the rated operating current of the multiple LED light strings and the system loss current value; or, the preset current includes: a second current value; wherein the second current value is the product of the first current value and a preset threshold.

[0008] In an embodiment of the first aspect of the present application, the voltage in the preset interval includes: a voltage interval from 0V to a first voltage value; wherein the first voltage value is greater than the actual operating voltage of the LED light string array.

[0009] In an embodiment of the first aspect of the present application, it also includes: a current detection circuit, which is arranged in series on the positive or negative circuit of the LED light string array, and the current detection circuit is also connected to the controller; the controller is specifically configured to collect the actual operating current of the LED light string array through the current detection circuit.

[0010] In an embodiment of the first aspect of the present application, the current detection circuit includes: a switching tube, a resistor and an amplifier; the switching tube and the resistor are connected in series to the positive or negative circuit of the LED light string array, and when the switching tube is turned off, the two ends of the resistor are used to output a detection signal of the actual working current of the LED light string array to the controller through the amplifier.

[0011] In an embodiment of the first aspect of the present application, the switching tube is a MOSFET.

[0012] In an embodiment of the first aspect of the present application, the controller is further configured to control the display device to switch to the second operating mode at every preset time interval, and after determining the target voltage, control the display device to switch to the first operating mode; or, when receiving a control command, control the display device to switch to the second operating mode, and after determining the target voltage, control the display device to switch to the first operating mode.

[0013] In an embodiment of the first aspect of the present application, the controller is further configured to determine the corresponding multiple target voltages when the LED light string array is in multiple working states; when the display device is in the first working mode and the LED light string array is in one of the multiple working states, control the power supply circuit to output the target voltage corresponding to the one working state to the LED driving circuit.

[0014] In an embodiment of the first aspect of the present application, the power supply circuit is configured to supply power to each LED light string in the LED light string array.

[0015] The second aspect of the present application provides a control method for a display device, which can be applied to the display device provided by the first aspect of the present application. The method includes: when the display device is in the second operating mode, outputting a voltage in a preset range when powering the LED driving circuit; wherein the LED driving circuit is configured to drive an LED light string array to illuminate the display panel, and the LED light string array includes multiple Mini LED light strings or multiple Micro LED light strings; collecting the actual operating current range of the LED light string array; determining a target voltage corresponding to a preset current in the actual operating current range; and when the display device is in the first operating mode, using the target voltage to power the LED driving circuit.

[0016] In summary, the display device and control method provided in the present application adjust the voltage output to the LED light string array through the controller power supply circuit, and detect the actual working current of the LED light string array through the current detection circuit, and then more accurately determine the actual working voltage of the LED light string array according to the change of the actual working current, and set the voltage output by the power supply circuit according to the actual working voltage, thereby reducing the invalid voltage output by the power supply circuit, and thus reducing the energy consumption of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 A schematic diagram of the application scenario of this application;

[0019] Figure 2 A schematic diagram of a power supply circuit outputting voltage and current to an LED driver circuit;

[0020] Figure 3 A schematic structural diagram of an embodiment of a display device provided in this application;

[0021] Figure 4 A schematic structural diagram of another embodiment of the display device provided by the present application;

[0022] Figure 5 This is a structural diagram of an embodiment of a current detection circuit provided by the present application;

[0023] Figure 6 A flow chart of an embodiment of a display device control method provided in this application;

[0024] Figure 7 A schematic diagram of the circuit parameters of the LED light string array provided in this application;

[0025] Figure 8 A schematic diagram of another application scenario of this application;

[0026] Figure 9 A schematic structural diagram of an embodiment of a display device provided in this application;

[0027] Figure 10 A schematic diagram of a voltage waveform output by a power supply according to an embodiment of the present application;

[0028] Figure 11 A schematic diagram comparing the power output voltages of the display device provided in this application. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. 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.

[0030] The terms "first," "second," "third," "fourth," and the like (if any) in the specification and claims of this application and in the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or apparatus.

[0031] Figure 1 This is a schematic diagram of the application scenario of this application, showing a schematic diagram of the structure of an embodiment of the display device provided by this application, wherein the display device can be an outdoor LED display screen or a Micro LED display screen, or the display device can also be a device with a display screen such as a TV, a computer, or a mobile phone. Figure 1 The display device 10 shown specifically includes: a display panel ( Figure 1The display panel is used to present images to the user. The LED light string array 13 is located below the display panel and is used to supply a light source with sufficient brightness and uniform distribution so that the display panel can display images. The LED light string array 13 includes multiple LED light strings, each of which can be used to provide a separate light source. Figure 1 In the example shown, the LED light string array 13 includes LED light string 1, LED light string 2...LED light string n, with a total of n LED light strings as an example. In addition to conventional OLED light string structures, the LED light string array 13 can also include multiple Mini LED light strings, or the LED light string array includes multiple Micro LED light strings, each of which can be used to provide a light source independently. Among them, Mini LED is an LED device with a chip size between 50-200μm, which can achieve a "pixel-level" display effect and has a high display quality. Micro LED refers to a display technology that uses self-luminous micron-sized LEDs as light-emitting pixel units and assembles them on a drive panel to form a high-density LED array. It has the characteristics of small size, high integration and self-luminescence.

[0032] The power supply circuit 11 is one of the important circuit structures in the display device 10. The power supply circuit 11 can supply power to the LED driving circuit 12 in the display device 10, so that the LED driving circuit can drive the LED light string array 13 to work and realize lighting, and the display device 10 can then realize the display function. In some embodiments, since the number of light strings in the LED light string array realized by Mini LED light strings and Micro LED light strings is large and the driving is relatively complex, the same power supply circuit 11 is used to supply power to multiple LED light strings at the same time, that is, the output end of the power supply circuit 11 is connected to the power supply ends of multiple LED light strings at the same time, thereby supplying power to each LED light string. At this time, the LED driving circuit 12 can be set at the negative pole of multiple LED light strings. This application does not limit the specific driving form of the LED driving circuit 12 to the LED light string array. The connecting lines in the figure are only used to illustrate the connection relationship between the LED driving circuit 12 and the LED light string array 13.

[0033] In some embodiments, since the voltage provided by the power supply circuit 11 to the LED driving circuit 12 needs to meet the normal operation of all multiple LED light string arrays, and the actual operating voltage of the LED light string will have a certain range of variation due to the process, the voltage value output by the power supply circuit 11 when supplying power to the LED driving circuit 12 needs to ensure that most of the multiple LED light strings can be in a constant current state for normal operation, so as to ensure the overall display effect of the multiple LED light strings.

[0034] In some embodiments, the voltage value provided by the power supply circuit 11 to the LED driving circuit 12 is set by empirically estimating the rated operating voltage and other specification parameters of the LED light string. For example, Figure 2 The figure is a schematic diagram of a power supply circuit outputting voltage and current to an LED driving circuit. Assuming that the actual operating voltage of the LED light string array is V0 and the actual operating current is I0, in order to ensure the normal operation of the LED light string array, the power supply circuit 11 sets the output voltage value to V0' and the output current value to I0' to the LED driving circuit 12. Since the voltage and current are both greater than the operating voltage and operating current of the LED light string array 13, the LED light string array 13 can operate normally.

[0035] In some embodiments, the LED light string array provided in the present application has a large number of light strings and a more complex drive, and the power supply circuit usually does not have a voltage feedback function, which makes it impossible for the power supply circuit to adjust the output voltage of the power supply circuit according to the actual working voltage it supplies to each LED light string. Therefore, when the power supply circuit supplies power to the LED light string array implemented using Mini LED light strings or Micro LED light strings, the accuracy of the voltage provided by the power supply circuit to the LED light strings is poor.

[0036] However, in the above embodiment, since the LED light string array cannot provide a voltage feedback function, the voltage value V0' provided by the power supply circuit 11 when supplying power to the LED driving circuit 12, which is determined by empirical estimation based on specification parameters, is usually significantly different from the actual operating voltage V0 of the LED light string array 13, so that the voltage between V0'-V0 output by the power supply circuit 11 is an invalid voltage, which is converted into heat loss of the display device, thereby increasing the energy consumption of the display device.

[0037] Therefore, the present application also provides a display device and a control method thereof, which can more accurately determine the actual operating voltage of the LED light string array and set the voltage output by the power supply circuit according to the actual operating voltage, thereby reducing the invalid voltage output by the power supply circuit and reducing the energy consumption of the display device. The technical solution of the present application is described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0038] Figure 3 This is a schematic structural diagram of an embodiment of a display device provided in this application, as shown in FIG. Figure 3The display device 10 shown can be an outdoor LED display screen or a Micro LED display screen, and the display device 10 specifically includes: a display panel, a power supply circuit 11, an LED driving circuit 12, an LED light string array 13, a current detection circuit 14, and a controller 15. The display panel is configured to display images, the power supply circuit 11 is configured to supply power to the display panel and the LED driving circuit 12, and the LED driving circuit is configured to drive multiple LED light strings in the LED light string array to light up the display panel. Figure 3 The current detection circuit 14 provided in the illustrated embodiment can be set in series at point A on the positive circuit of the LED light string array 13 and connected to the controller 15. The current detection circuit 14 can be used to collect the actual working current flowing through the positive electrode of the LED light string array 13 when the LED driving circuit 12 drives the LED light string array 13 to work.

[0039] In some embodiments, Figure 4 This is a structural diagram of another embodiment of the display device provided by the present application, such as Figure 4 In the display device 10 shown, Figure 3 The difference from the illustrated embodiment is that the current detection circuit 14 can be set in series at point B on the negative circuit of the LED light string array 13. The current detection circuit 14 can be used to collect the actual working current flowing through the negative pole of the LED light string array 13 when the LED driving circuit 12 drives the LED light string array 13 to work.

[0040] In some embodiments, Figure 5 This is a structural diagram of an embodiment of the current detection circuit provided by this application, as shown in FIG. Figure 5 The current detection circuit shown includes: a switch tube, a resistor R1 and an amplifier, wherein the switch tube and the resistor R1 are connected in series to the positive or negative circuit of the LED light string array 13, and both ends of the resistor R1 are connected to the controller through the amplifier. Figure 5 The current sensing circuit shown is used in Figure 3 In the figure, it is set at point A, X is the LED driving circuit 12, and Y is the LED light string array 13. Figure 5 The current sensing circuit shown is used in Figure 4 In the example, the circuit is set at point B, X represents the LED light string array 13, and Y represents the LED driver circuit 12. The control terminal Z of the switch tube can be connected to the controller, which controls the switch tube to close when current detection is required. At the same time, the two ends of resistor R1 are also connected to the controller through an amplifier. When the switch tube is closed, the amplifier can be used to amplify the current flowing through resistor R1 and provide it to the controller. The current received by the controller is the actual operating current of the LED light string array.

[0041] In some embodiments, considering that measurement accuracy is poor when the actual operating current of the LED light string array is low, the resistance of resistor R1 can be increased. The resulting current reduction can be amplified and compensated by an amplifier. The switching transistor can specifically be a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), which can reduce heat loss caused by the switching transistor during operation.

[0042] In some embodiments, the display device provided in the embodiments of the present application includes at least two operating modes, which are recorded as a first operating mode and a second operating mode. Among them, when the display device is in the first operating mode, the power supply circuit 11 can, under the control of the controller 15, supply power to the LED driver circuit 12 at a target voltage determined by the controller, so that the LED driver circuit 12 drives the LED light string array 13 to light up the display panel. The first operating mode can also be called a normal operating mode, a normal operating mode, etc. In the first operating mode, the display device performs normal display. When the display device is in the second operating mode, the controller 15 can adjust the voltage when the power supply circuit 11 supplies power to the LED driver circuit 12, and collect the actual operating current of the LED light string array when operating at different voltages, and then determine the target voltage that the power supply circuit 11 should provide to the LED driver circuit 12 based on the actual operating current. In the second operating mode, the display device may not display temporarily, but the target voltage is determined by the controller 15. The obtained target voltage can be used when the power supply circuit 11 subsequently supplies power to the LED driver circuit 12, so it can also be called a detection mode, an adjustment mode, etc.

[0043] In some embodiments, Figure 6 This is a flow chart of an embodiment of a display device control method provided by the present application, as shown in FIG. Figure 6 The control method shown can be implemented as follows Figure 3 or Figure 4 The controller 15 in the display device shown in FIG. Figure 6 The control method of the display device shown includes:

[0044] S100: Switching the display device from the first operating mode to the second operating mode.

[0045] When the display device is in the first operating mode, the controller may control the display device to switch from the first operating mode to the second operating mode after a period of time (e.g., one month), and redefine the target voltage in the second operating mode. Alternatively, the controller may receive a control command from a user or the display device system, and upon receiving the control command, determine that the target voltage needs to be redetermined, thereby controlling the display device to switch from the first operating mode to the second operating mode.

[0046] S101: The controller controls the power supply circuit to provide different voltages to the LED driving circuit. The voltage changes according to a certain rule within a preset range.

[0047] Specifically, in order to determine the actual operating voltage and actual operating current of the LED light string array, the controller can use a traversal method to provide a voltage within a preset range to the LED driving circuit, wherein the voltage of the preset range includes: 0V-the voltage range where the first voltage value is located, wherein the first voltage value is a voltage greater than the actual operating voltage of the LED light string array.

[0048] For example, Figure 7 This is a schematic diagram of the circuit parameters of the LED light string array provided in this application, wherein in S101, the controller can be Figure 7 The voltage shown on the horizontal axis in , starting from 0V, takes a voltage at a certain interval, and controls the power supply circuit to output a voltage of [0V, Vmax] to the LED drive circuit.

[0049] S102: The controller collects the actual operating current of the LED driving circuit through the current detection circuit.

[0050] by Figure 7 For example, when the controller controls the power supply circuit to provide the voltage of V1 to the LED driving circuit, and the LED driving circuit drives the LED light string array according to the voltage of V1 to start working, the current flowing through the LED light string array is I1. The controller can determine the current I1 by controlling the closing of the switch tube in the current detection circuit and collecting the current value obtained after the current on both sides of R1 passes through the amplifier. In the same way as above, when the controller controls the power supply circuit to output a voltage in the preset range of [0, Vmax] to the LED driving circuit, the actual working current change of the LED light string array under the corresponding voltage can be collected. The voltage output by the power supply circuit and the working current of the LED driving component are plotted in a two-dimensional coordinate system, as shown below. Figure 7 The graph shown.

[0051] S103: The controller performs the following operations: Figure 7 The corresponding relationship between the supply voltage and the actual working current is shown to determine the target voltage corresponding to the preset current in the working current range.

[0052] In some embodiments, since the LED light string array is not provided with a voltage feedback circuit, the controller can indirectly determine the change in the current of the LED light string array based on the current change of the LED light string array under different voltages. Among them, the preset current is a known quantity, which can be the rated operating current of multiple LED light strings, and the sum of the system loss current value as the first current value I3. The system loss current value is the inherent loss value of the LED light string array and can be obtained by calculation or actual measurement. Since the system loss current value is generally relatively stable and does not change, and the rated operating current of multiple LED light strings is usually the same, the current value I3 can be expressed by the formula , is the rated operating current of the LED light string, I s is the system loss current value. Then when S102 is obtained as follows Figure 7 After adjusting the circuit parameters shown, the corresponding supply voltage V3 can be determined as the target voltage according to the first current value I3.

[0053] In other embodiments, the preset current may also be a second current value I2, where I2 is the product of the first current value I3 and a preset threshold value, wherein the preset threshold value may be determined by the display effect and working efficiency of the LED light string array. For example, the preset threshold value may be the ratio of the number of normally functioning LED light strings in the plurality of LED light strings to the number n of the plurality of LED light strings. For example, assuming that it is desired to achieve a display effect and working efficiency in which 95% of the LED light strings in the LED light string array can function normally, then it may be calculated as As the second current value, the corresponding supply voltage V2 is then determined as the target voltage according to the second current value I2.

[0054] S200: After determining the target voltage, the display device can be switched from the second operating mode back to the first operating mode for normal operation at S200. Alternatively, the display device can be switched back to the first operating mode a certain time after being switched to the second operating mode at S100.

[0055] S201: The controller controls the power supply circuit to supply power to the LED driving circuit using the target voltage.

[0056] Specifically, refer to Figure 7 Assuming that the target voltage is V3, the target voltage V3 provided at this time can enable the LED light string array to work at the first current value I3. Figure 7 It can be seen from the figure that when the voltage provided by the power supply circuit is greater than V3, the actual operating current of the LED light string array will not continue to change, as shown in the following example. Figure 2In the technology shown, compared with setting the power supply circuit to Vmax based on empirical estimation, there is no need to set the output voltage of the power supply circuit to Vmax. Instead, the operating voltage change of the LED light string array is determined more accurately based on the actual operating current. Therefore, the voltage output by the power supply circuit to the LED driving circuit can be set to the minimum operating voltage V3 that can meet the normal operation of the LED light string array, thereby reducing the invalid voltage of the V3-Vmax part output by the power supply circuit, and thus reducing the energy consumption of the display device.

[0057] In some embodiments, the above Figure 6 The entire process shown in FIG. 1 provides a process for the controller to determine the target voltage output by the power supply circuit. Based on the above process, the controller can also determine the target voltage output by the power supply circuit when the LED light string array is in different working states. Figure 6 The process shown determines the target voltage corresponding to each operating state. Subsequently, when the display device is determined to be in a different operating state, the power supply circuit is controlled to output the target voltage corresponding to the operating state to the LED driver circuit, thereby further improving the granularity of control over the display device and reducing wireless energy consumption caused by changes in operating state. For example, when the display device is operating during the day, a target voltage of 1 is determined, and when the display device is operating at night, another target voltage of 2 is determined. When the display device is operating during the day, the controller controls the power supply circuit to output target voltage 1, and when the display device is operating at night, the controller controls the power supply circuit to output target voltage 2. For another example, when the temperature of the display device is below 30 degrees Celsius, a target voltage of 1 is determined, and when the temperature is above 30 degrees Celsius, another target voltage of 2 is determined. When the temperature of the display device is below 30 degrees Celsius, the controller controls the power supply circuit to output target voltage 1, and when the temperature is above 30 degrees Celsius, the controller controls the power supply circuit to output target voltage 2. The display device can determine the current operating state based on a sensor or based on a user's instruction.

[0058] In some embodiments, the display device provided by the present application may also be a MicroLED direct display product including RGB three-color LED light strings, wherein the operating voltages required for the red LED light string, the green LED light string, and the blue LED light string may be different. For example, the voltage required for the red LED may be lower than that of the green LED and the blue LED due to its lower voltage requirement. Therefore, in the display device provided by the present application, the LED light string array may be divided into three LED light string groups according to the colors R, G, and B of the LED light strings, with the red LED light string forming one group, the green LED light string forming one group, and the blue LED light string forming one group. At the same time, three independent power supply circuits may be provided in the display device to respectively power the red LED light string group, the green LED light string group, and the blue LED light string group. The RGB control method is usually a scanning control method, and the LED light string groups of different colors do not work at the same time to save the number of driving circuits.

[0059] Therefore, based on the aforementioned process of the present application, the controller can also control the corresponding power supply circuits to output voltages of different preset ranges at different times when in the second working mode by setting up the same current detection circuit to obtain the target voltages V1, V2, and V3 of the red LED light string group, the green LED light string group, and the blue LED light string group, respectively. Subsequently, in the first working mode, the controller can control the power supply circuits corresponding to the different color light string groups according to the target voltage determined in the second working mode, and output the target voltage values ​​V1, V2, and V3 to the red LED light string group, the green LED light string group, and the blue LED light string group, respectively, during the working time of the different color light string groups.

[0060] In some embodiments, in the display device provided by the present application, the controller is in the first working mode, and when the LED light string array is working, the actual working current of the LED driving circuit is collected in real time, and the target voltage is determined according to the actual working current when the LED light string array is working. At this time, there is no need to switch the working mode, and the controller collects the actual working voltage during the operation of the LED light string array, thereby reducing the impact on the normal operation of the LED light string array.

[0061] In some embodiments, when at least two controllers are provided in a display device, and one controller supplies power to multiple LED light string arrays, a first controller in the display device is in a first operating mode, controlling the power supply circuit to supply power to the first LED light string array. Simultaneously, a second controller in the display device can be in a second operating mode and determine the target voltage of the second LED light string array by the method of S101-S103 of the present application, thereby reducing the impact on the normal operation of the multiple LED light string arrays in the display device, allowing the LED light string arrays in the display device to continue to operate, and also being able to obtain the target voltages corresponding to different LED light string arrays.

[0062] The present application also provides a control method for a display device, which can be applied to the display device provided in the aforementioned embodiments of the present application. The method comprises: when the display device is in a second operating mode, outputting a voltage within a preset range when powering the LED driver circuit; wherein the LED driver circuit is configured to drive an LED light string array to illuminate a display panel, the LED light string array comprising a plurality of Mini LED light strings or a plurality of Micro LED light strings; collecting an actual operating current range of the LED light string array; determining a target voltage corresponding to a preset current within the actual operating current range; and when the display device is in the first operating mode, using the target voltage to power the LED driver circuit. The control method provided in this embodiment can be executed by a unit with relevant control and data processing functions, such as a CPU, in the display device, or by a controller in the display device.

[0063] Those skilled in the art will appreciate that all or part of the steps in the above-described method embodiments can be implemented using hardware associated with program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0064] 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 them. 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 make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

[0065] In another embodiment provided in this application, Figure 8 This is a schematic diagram of another application scenario of this application, wherein Figure 1 Based on the illustrated embodiment, the process of the power supply circuit in the display device supplying power to the LED light string array through the LED driving circuit can be simplified as follows: the power supply circuit provides voltage to different LED light strings in the LED light string array respectively.

[0066] Figure 9 This is a schematic structural diagram of an embodiment of a display device provided in this application, as shown in FIG. Figure 9 The display device shown is Figure 8 On the basis of the illustrated embodiment, it includes: a display panel 1, an LED light string array 2 and a power supply circuit 3, wherein the display panel 1 is configured to display an image, and the LED light string array 2 is configured to light up the display panel 1 together.

[0067] In some embodiments, the present application embodiment groups n LED light string arrays included in the LED light string array 2 to obtain multiple groups of LED light strings, each group of LED light strings includes at least one LED light string. Figure 9 In the example shown, the LED light string array 2 includes n LED light strings, and the n LED light strings can be divided into m groups of LED light strings, which are denoted as LED light string group 1, LED light string group 2, ..., LED light string group m, where m<n.

[0068] In some embodiments, when the LED light strings in the LED light string array 2 are grouped as described above, they can be divided according to the arrangement order of the LED light string array 2 itself. For example, the n LED light strings numbered 1-n are arranged in sequence in the LED light string array 2. At this time, it can be determined that the working voltage required for the n LED light strings to work is V1-Vn. Subsequently, according to the change of the working voltage in the V1-Vn sequence, the n LED light strings are divided into m groups according to the change of the working voltage in the original 1-n arrangement order. At the same time, the working voltage of the LED light strings in each group is within a preset variation range. For example, the operating voltage of the first LED light string is V1=50V, the operating voltage of the second LED light string is V2=51V, the operating voltage of the third LED light string is V3=56V, and the operating voltage of the fourth LED light string is V4=56.5V. The preset variation range is set to 0.5V. If the difference between V1 and V2 is within the preset variation range and the difference between V2 and V3 exceeds the preset variation range, the first LED light string and the second LED light string can be divided into one LED light string group, and the third LED light string and the fourth LED light string can be divided into one LED light string group.

[0069] In some embodiments, the above-mentioned groupings may be divided and recorded when the display device leaves the factory, so that the subsequent power supply circuit can supply power to the LED light string array according to the above-mentioned groupings. Alternatively, the above-mentioned groupings may also be obtained by the power supply circuit when working, in real time, by obtaining the voltage of each LED light string and dividing it, and then supplying power to the LED light string array. Alternatively, the above-mentioned groupings may also be input or specified after detection by the user or staff of the display device.

[0070] In other embodiments, when the LED light strings in the LED light string array 2 are grouped, the LED light string array can also be arranged according to the change rule of the working voltage of each group before the display device leaves the factory. For example, the working voltage of all LED light strings in LED light string group 1 is less than the working voltage of all LED light strings in LED light string group 2, and so on, so that the working voltages of all multiple groups of LED light strings are arranged in an increasing order.

[0071] In some embodiments, a power supply circuit 3 provided in the present application is provided with a power supply 31, and the power supply 31 supplies power to the LED light string array 2. Specifically, the power supply 31 provided in the present application can be configured to supply power to each LED light string group in a time-sharing manner according to the multiple LED light string groups divided in the LED light string array 2, and the voltages provided by the power supply 31 to the multiple LED light string groups in a time-sharing manner can be different, that is, the voltage output by the power supply 31 is variable and changes according to a certain preset voltage value.

[0072] In such Figure 9 In the illustrated embodiment, in order to reduce the complexity of driving mini or micro LED light strings and realize that one power supply 31 can supply power to multiple LED light string groups at the same time, the power supply circuit 3 specifically includes: a power supply 31, a switch unit 32 and a control unit 33, wherein the power supply 31 is connected to the multiple LED light string groups respectively through the switch unit 32, and the control unit 33 can be used to control the on and off of the switch unit 32. At this time, the power supply 31 can output different voltages in different time periods within a preset cycle according to preset voltage information, and the control unit 33 controls the switch unit 32 to establish a connection relationship between the power supply 31 and the LED light string group within the corresponding time period, so that the power supply 31 can supply power to the LED light string group within the corresponding time period through the switch unit 32.

[0073] In some embodiments, the switch unit 32 may include multiple switches, one end of each switch is connected to the power supply 31, and the other end is connected to an LED light string group, so that the control power supply 33 can control the opening and conduction of each switch in the switch unit 32, and the control power supply 31 supplies power to the LED light string group in the corresponding time period through the switch unit 32.

[0074] In some embodiments, the control unit 33 provided in the embodiment of the present application can also be connected to multiple groups of LED light strings and a power supply, and when the multiple groups of LED light strings are working, the working current of each group of LED light strings is collected, and the power supply is controlled to adjust the voltage value output to the multiple groups of LED light strings through feedback control.

[0075] Figure 10 This is a waveform diagram of the voltage output by the power supply provided in the embodiment of the present application, wherein the power supply 31 of the display device adopts a time-sharing power supply method, cyclically supplies power to multiple LED light string groups in the form of a certain preset cycle scan, and within each preset cycle, supplies power to one LED light string group in the multiple LED light string groups in different time periods. Figure 10In the example shown, the power supply 31 in the power supply circuit 3 outputs different voltage values ​​to different groups of LED light strings at different time periods within the entire preset period T1-t0, according to the voltage values ​​corresponding to the multiple groups of LED light strings in the preset voltage information. In some embodiments, the preset voltage information can be pre-stored in the power supply when the display device leaves the factory, or it can be determined by the user or staff of the display device and then input into the display device.

[0076] For example, the voltage value corresponding to LED light string group 1 is V1, the voltage value corresponding to LED light string group 2 is V2... and so on. During the working time T1-T2 of LED light string group 1, the voltage value Vv output by the power supply 31 is V1, or slightly greater than V1, so that during T1-T2, only one group of LED light string group 1 works, and the other LED light string groups do not work at the same time; during the working time T2-T3 of LED light string group 2, the voltage value Vv output by the power supply 31 is V2, or slightly greater than V2, so that during T2-T3, only one group of LED light string group 2 works, and the other LED light string groups do not work at the same time; and so on, the voltage value Vv output by the power supply 31 supplies power to the multiple LED light string groups respectively according to the working time of the multiple LED light string groups, and the voltage output by the power supply 31 also changes according to the working voltage of the LED light string group, and the multiple groups of LED light strings do not work at the same time.

[0077] In some embodiments, taking into account the delay in the power supply output response, the power supply 31 does not strictly change the voltage according to the start time of each group of LED light strings when outputting the voltage value Vv. Instead, the power supply 31 outputs the voltage value at the actual start time obtained by advancing the voltage value provided in each time period by a certain delay. This avoids the impact of the power supply response delay on the normal operation of the LED light strings, further optimizes the power supply process, and ensures the effectiveness of the power supply. For example, when the power supply is supplying power to LED light string group 1, the output voltage reaches V1 during the time period T1-T2. When powering LED light string group 2 in the next time period T2-T3, a preset delay T is set in advance. At time T2-T, the output voltage Vv is changed from V1 to V2 in advance. Therefore, after the LED light string group 2 starts operating at time T2, the power supply can ensure that the output voltage value Vv is stable at V2. By analogy, within the entire preset period T1-t0, the actual start time of each time period is compared with the working start time T1, T2, T3...Tm of a group of LED light strings powered by the power supply circuit within the time period, and there is a preset time delay T, so the actual start time of each time period is T1-T, T2-T, T3-T...Tm-T.

[0078] Figure 11Schematic diagram of the comparison of the power output voltage of the display device provided in this application, wherein Vmax at the top of the figure is the voltage curve output by the power supply of the display device, and Vv at the bottom of the figure is the voltage curve output by the power supply of the display device provided in the embodiment of this application. It can be seen that the energy consumption of the display device is , changes to , reducing the energy loss in the shaded area in the figure.

[0079] In some embodiments, the display device provided in the present application can also group the LED light strings according to the functions realized by different LED light strings in the LED light string array or different working parameters, for example, grouping according to the different colors displayed by the LED light strings in the LED light string array, grouping according to the different working times of the LED light strings, grouping according to the different working scenes of the LED light strings, etc.

[0080] In some embodiments, the display device provided in the present application may also be a MicroLED direct display product including an RGB three-color LED light string, wherein the operating voltages required for the red LED light string, the green LED light string, and the blue LED light string may be different. For example, the voltage required for the red LED may be lower than that of the green LED and the blue LED due to its lower voltage requirement. Therefore, in the display device provided by the present application, the LED light string array can be divided into three LED light string groups according to the colors R, G and B of the LED light strings, with red LED light strings as one group, green LED light strings as one group, and blue LED light strings as one group. At the same time, the three LED arrays are all provided with voltage by the same power supply circuit. At this time, the power supply circuit can set the output voltage timing of the power supply according to the required voltage and working time of the three arrays, so that corresponding voltages are output to LED light string groups of different colors in different time periods within a preset cycle. For example, the output voltage of the power supply circuit is V1 during the time period when the red LED is lit in the preset cycle, the output voltage of the power supply circuit is V2 during the time period when the green LED is lit, and the output voltage of the power supply circuit is V3 during the time period when the blue LED is lit, and this is repeated according to the preset cycle, so that in the RGB Micro LED direct display product, only one power supply circuit is needed to power LED light strings of different colors. Therefore, while reducing the number of power supply circuits, higher power supply efficiency can also be achieved.

[0081] In summary, the display device provided in the embodiment of the present application can divide the LED light strings in the LED light string array into multiple LED light string groups according to the required power supply voltage, and through a power supply set in the power supply circuit, different power supply voltages are provided to the multiple LED light string groups in different time periods within a preset cycle through a time-sharing power supply method. Therefore, the display device provided in the present application does not need to set up multiple power supplies in the power supply circuit, overcoming the problem of the relatively complex power supply circuit structure in the display device, and at the same time, it can also make the electric energy output by the power supply in the power supply circuit adapt to the LED light string group, overcoming the problem of energy waste in the power supply circuit in the display device, and finally achieving the technical effect of improving the power supply energy efficiency of the display device when the power supply circuit structure of the display device is relatively simple.

Claims

1. A display device, characterized in that: include: a display panel configured to display an image; An LED driving circuit is configured to drive an LED light string array to provide a light source, wherein the LED light string array includes a plurality of LED light strings; Power supply circuit; The controller is configured as: When the display device is in the second operating mode, controlling the power supply circuit to output a voltage within a preset range when supplying power to the LED driving circuit, and collecting an actual operating current within an actual operating current range of the LED light string array; and generating a corresponding relationship between the power supply voltage and the actual operating current based on the voltage output by the power supply circuit and the actual operating current; Determining a target voltage corresponding to a preset current in the actual operating current range based on a correspondence between the supply voltage and the actual operating current; wherein the preset current includes: a first current value; the first current value is the sum of the rated operating current of the plurality of LED light strings and a system loss current value; or, the preset current includes: a second current value; the second current value is the product of the first current value and a preset threshold value; When the display device is in the first operating mode, the power supply circuit is controlled to use the target voltage determined by the controller to supply power to the LED driving circuit.

2. The display device according to claim 1, wherein The voltage in the preset range includes: a voltage range from 0V to a first voltage value; wherein, the first voltage value is greater than the actual working voltage of the LED light string array.

3. The display device according to claim 2, wherein: Also includes: A current detection circuit is arranged in series on the positive or negative circuit of the LED light string array, and the current detection circuit is also connected to the controller; The controller is specifically configured to collect the actual operating current of the LED light string array through the current detection circuit.

4. The display device according to claim 3, wherein: The current detection circuit includes: a switch tube, a resistor and an amplifier; The switch tube and the resistor are connected in series to the positive or negative circuit of the LED light string array. When the switch tube is turned off, the two ends of the resistor are used to output a detection signal of the actual working current of the LED light string array to the controller through an amplifier.

5. The display device according to claim 4, wherein: The switch tube is a MOSFET.

6. The display device according to any one of claims 1 to 5, characterized in that: The controller is further configured to: controlling the display device to switch to the second operating mode at every preset time interval, and controlling the display device to switch to the first operating mode after determining the target voltage; Alternatively, when a control command is received, the display device is controlled to switch to the second operating mode, and after the target voltage is determined, the display device is controlled to switch to the first operating mode.

7. The display device according to any one of claims 1 to 5, characterized in that: The controller is further configured to: Determining the corresponding target voltages when the LED light string array is in multiple working states; When the display device is in the first operating mode and the LED light string array is in one of the multiple operating states, the power supply circuit is controlled to output a target voltage corresponding to the one operating state to the LED driving circuit.

8. The display device according to any one of claims 1 to 5, characterized in that: The power supply circuit is configured to supply power to each LED light string in the LED light string array.

9. A method for controlling a display device, characterized in that: include: When the display device is in the second operating mode, a voltage within a preset range is output when power is supplied to the LED driving circuit; wherein the LED driving circuit is configured to drive an LED light string array to provide a light source, and the LED light string array includes a plurality of LED light strings; Collecting the actual operating current of the LED light string array in the actual operating current range; generating a correspondence between the power supply voltage and the actual working current according to the voltage output by the power supply circuit and the actual working current; determining a target voltage corresponding to a preset current in the actual working current range according to the correspondence between the power supply voltage and the actual working current; The preset current includes: a first current value; the first current value is the sum of the rated operating current of the plurality of LED light strings and the system loss current value; Alternatively, the preset current includes: a second current value; the second current value is the product of the first current value and a preset threshold; When the display device is in the first operation mode, the target voltage is used to supply power to the LED driving circuit.

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