Light-emitting substrate and driving method

Abstract

Disclosed in the present application are a light-emitting substrate and a driving method. The light-emitting substrate comprises: a power supply module and a plurality of light-emitting modules. The power supply module comprises a power supply unit, a power supply line and a feedback line, the power supply unit comprising a voltage output end and a signal receiving end, and the power supply module being used for, on the basis of a feedback signal received by the signal receiving end, controlling the voltage output end to output a power supply voltage; and the light-emitting modules are used for emitting light under the driving of the power supply voltage and, on the basis of the power supply voltage, outputting a feedback signal to the power supply unit.

Description

Light-emitting substrate and driving method Technical Field

[0001] The present application relates to the field of display technology, and in particular to a light-emitting substrate and a driving method. Background Art

[0002] Micro-LED and sub-millimeter LED displays contain thousands or even tens of thousands of LEDs. To drive the LEDs, existing light-emitting substrates are equipped with an AC-DC power module and a DC-DC power module. The AC-DC power module converts the AC voltage provided by an external power source into a DC voltage, while the DC-DC power module converts the DC voltage provided by the AC-DC power module into the driving voltage required to drive the LEDs.

[0003] In the existing light-emitting substrate, a plurality of DC-DC power modules are provided to respectively provide driving voltages to the light-emitting diodes in corresponding areas, which makes the circuit structure of the existing light-emitting substrate complex and the cost too high. SUMMARY OF THE INVENTION

[0004] The present application provides a light-emitting substrate and a driving method, which can simplify the circuit structure and reduce costs.

[0005] On the one hand, an embodiment of the present application provides a light-emitting substrate, comprising: a power supply module and a plurality of light-emitting modules, the power supply module comprising a power supply unit, a power supply line and a feedback line, the power supply unit comprising a voltage output end and a signal receiving end, the power supply line and the feedback line each having a first end and a plurality of second ends, the first end of the power supply line being electrically connected to the voltage output end, the first end of the feedback line being electrically connected to the signal receiving end, the power supply module being used to control the voltage output end to output a power supply voltage based on a feedback signal received by the signal receiving end; the plurality of light-emitting modules being electrically connected to the second end of the power supply line, respectively, and the plurality of light-emitting modules being electrically connected to the second end of the feedback line, respectively, the light-emitting modules being used to emit light under the drive of the power supply voltage, and outputting the feedback signal to the power supply unit based on the power supply voltage.

[0006] On the other hand, an embodiment of the present application also provides a driving method, including: obtaining an initial power supply voltage value provided by a power supply module and a driving voltage value required for the light-emitting module to emit light; calculating a voltage difference between the initial power supply voltage value and the driving voltage value; outputting a feedback signal based on the voltage difference; and adjusting the initial power supply voltage value to a target power supply voltage value based on the feedback signal. Beneficial effects

[0007] The present application provides a light-emitting substrate and a driving method. The light-emitting substrate includes: a power module and multiple light-emitting modules. The power module includes a power supply unit, a power line, and a feedback line. The power supply unit includes a voltage output terminal and a signal receiving terminal. The power line and the feedback line each have a first end and multiple second ends. The first end of the power line is electrically connected to the voltage output terminal, and the first end of the feedback line is electrically connected to the signal receiving terminal. The power module is used to control the voltage output terminal to output a power voltage based on a feedback signal received by the signal receiving terminal. The multiple light-emitting modules are respectively electrically connected to the second end of the power line, and the multiple light-emitting modules are respectively electrically connected to the second end of the feedback line. The light-emitting modules are driven by the power voltage to emit light and output the feedback signal to the power supply unit based on the power voltage. The light-emitting substrate provides multiple second ends for the power line and the feedback line in the power module, and electrically connects the multiple light-emitting modules to the multiple second ends of the power line and the multiple second ends of the feedback line. That is, by providing a single power module, the power voltage is provided to all the light-emitting modules. This reduces the number of power modules used, simplifies the circuit structure, and significantly reduces costs, which is conducive to improving the competitiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] FIG1 is a block diagram of a light-emitting substrate provided in an embodiment of the present application;

[0009] FIG2 is a first schematic diagram of a light-emitting substrate provided in an embodiment of the present application;

[0010] FIG3 is a second schematic diagram of a light-emitting substrate provided in an embodiment of the present application;

[0011] FIG4 is a third schematic diagram of a light-emitting substrate provided in an embodiment of the present application;

[0012] FIG5 is a fourth schematic diagram of a light-emitting substrate provided in an embodiment of the present application;

[0013] FIG6 is a fifth schematic diagram of a light-emitting substrate provided in an embodiment of the present application;

[0014] FIG7 is a flow chart of a driving method provided in an embodiment of the present application;

[0015] FIG8 is a flow chart of step S30 in FIG7 . Modes for Carrying Out the Invention

[0016] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. The described technical solutions are only used to explain and illustrate the ideas of the present application and should not be regarded as limiting the scope of protection of the present application.

[0017] As shown in FIG1 , an embodiment of the present application provides a light-emitting substrate 100, comprising a power module 10 and a plurality of light-emitting modules 20. The power module 10 includes a power supply unit 11, a power line 12, and a feedback line 13. The power supply unit 11 includes a voltage output terminal 111 and a signal receiving terminal 112. The power line 12 and the feedback line 13 each have a first end and multiple second ends. The first end 121 of the power line 12 is electrically connected to the voltage output terminal 111, and the first end 131 of the feedback line 13 is electrically connected to the signal receiving terminal 112. The power module 10 is configured to control the output of a power voltage from the voltage output terminal 111 based on a feedback signal received by the signal receiving terminal 112. The plurality of light-emitting modules 20 are respectively electrically connected to the second end 122 of the power line 12, and the plurality of light-emitting modules 20 are respectively electrically connected to the second end 132 of the feedback line 13. The light-emitting modules 20 are configured to emit light driven by the power voltage and to output feedback signals based on the power voltage to the power supply unit 11.

[0018] In the light-emitting substrate provided in the present application, since the power line 12 and the feedback line 13 in the power module 10 are respectively provided with multiple second ends, the multiple light-emitting modules 20 are respectively electrically connected to the multiple second ends 122 of the power line 12 and the multiple second ends of the feedback line 13. That is, by providing one power module 10, it is possible to provide power supply voltage to all the light-emitting modules 20, reduce the number of power modules 10 used, achieve simplification of the circuit structure and significant reduction in cost, which is conducive to improving the competitiveness of the product.

[0019] In the embodiment of the present application, the light-emitting substrate 100 further comprises a substrate, on which the light-emitting module 20 and at least a portion of the power module 10 are disposed. Specifically, the light-emitting substrate can be applied to any product or component with a display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigation system.

[0020] In an embodiment of the present application, the power supply unit 11 includes an AC-DC converter, which includes a voltage input terminal, a voltage output terminal, and a signal receiving terminal. The voltage input terminal is used to receive an AC voltage, the signal receiving terminal is used to receive a feedback signal, and the voltage output terminal is used to control the output of the power supply voltage based on the feedback signal. Specifically, the power supply unit 11 receives an AC voltage provided by an external power source, such as a household 220V AC voltage, and converts the AC voltage into a DC voltage for driving the light-emitting module 20 to emit light. The power supply unit 11 dynamically adjusts the power supply voltage based on the feedback signal. For example, when the power supply voltage does not match the driving voltage required for the light-emitting module 20 to emit light, the light-emitting module 20 provides a feedback signal to the power supply unit 11, and the power supply unit 11 adjusts the power supply voltage based on the feedback signal to ensure that the light-emitting module 20 emits light normally. Furthermore, when the voltage difference between the power supply voltage and the driving voltage required for the light-emitting module 20 to emit light exceeds a preset threshold, the power supply voltage is reduced based on the feedback signal to prevent heating of the driver chip and reduce power consumption.

[0021] As shown in FIG2 , the light-emitting module 20 includes a light-emitting unit 21 and a driver chip 22. The driver chip 22 includes a first pin 221 and a second pin 222. The anode A of the light-emitting unit 21 is electrically connected to the second end 122 of the power line 12, the cathode C of the light-emitting unit 21 is electrically connected to the first pin 221 of the driver chip 22, and the second pin 222 of the driver chip 22 is electrically connected to the second end 132 of the feedback line 13. Specifically, the light-emitting unit 21 can be a light-emitting diode, or a light-emitting diode string formed by connecting multiple light-emitting diodes in series. Each driver chip 22 is electrically connected to at least one light-emitting diode or at least one light-emitting diode string, and the driver chip 22 is used to drive the corresponding light-emitting unit to emit light.

[0022] In an embodiment of the present application, a plurality of gear currents are pre-set in the driver chip 22 according to the display brightness range, and a corresponding relationship between the luminous brightness of the light-emitting unit 21 and the driving current is established. Among them, the luminous brightness is positively correlated with the driving current, that is, the greater the luminous brightness, the greater the driving current; the smaller the luminous brightness, the smaller the driving current. By determining the maximum current value corresponding to the maximum display brightness and the minimum current value corresponding to the minimum display brightness, the current range can be determined. For example, the maximum current value corresponding to the maximum display brightness of 1600 candelas per square meter is 7 mA, and the minimum current value corresponding to the minimum display brightness of 600 candelas per square meter is 1 mA, then the current range is 1 mA to 7 mA.

[0023] Furthermore, multiple current values ​​in the current range are set as gear currents. The gear currents include at least two, that is, the maximum current value and the minimum current value of the current range are each a gear current. On this basis, a current value can also be selected as a gear current at every fixed interval between the maximum current value and the minimum current value. For example, the multiple current values ​​in the current range include four gear currents, namely 1 mA, 3 mA, 5 mA and 7 mA. Furthermore, the multiple gear currents have a corresponding relationship with the grayscale. Among them, the larger the gear current, the larger the grayscale value; the smaller the gear current, the smaller the grayscale value. The gear current includes multiple, and the driver chip can adjust the initial gear current to the corresponding target gear current according to the power supply voltage value.

[0024] In an embodiment of the present application, the median value among the multiple gear currents is used as the initial gear current. When the voltage difference between the power supply voltage provided by the power module 10 and the driving voltage required for the light-emitting unit 21 to emit light is greater than a preset threshold value, the gear current of the driver chip is negatively adjusted, that is, a gear current smaller than the initial gear current is selected as the target gear current. Correspondingly, when the voltage difference between the power supply voltage provided by the power module 10 and the driving voltage required for the light-emitting unit 21 to emit light is less than a preset threshold value, the gear current of the driver chip is positively adjusted, that is, a gear current larger than the initial gear current is selected as the target gear current. The light-emitting substrate adjusts the power supply voltage according to the gear current of the light-emitting unit 21 and the current value on the second end 132 of the feedback line 13 electrically connected to the corresponding driver chip 22.

[0025] Specifically, the change in power supply voltage is calculated according to Formula 1:

[0026] (Formula 1)

[0027] Among them, ΔVLED refers to the change in power supply voltage, N i Refers to the current gear corresponding to the i-th driver chip 22, I FBi It refers to the current value on the second end 132 of the feedback line 13 electrically connected to the i-th driver chip 22 .

[0028] In an embodiment of the present application, a plurality of light-emitting modules 20 are divided into at least two light-emitting module groups 201. The light-emitting module groups 201 include a plurality of light-emitting modules 20 arranged along a first direction X. At least two light-emitting module groups 201 are arranged along a second direction Y, and the first direction X intersects the second direction Y. Preferably, the first direction X is perpendicular to the second direction Y. As shown in FIG. 2 , the first direction X is the length direction of the display panel, and the second direction is the width direction of the display panel. Specifically, the first direction X may be the width direction of the display panel, and the second direction may be the length direction of the display panel.

[0029] In the embodiment of the present application, the multiple second ends 132 of the feedback line 13 electrically connected to the multiple light-emitting modules 20 in the same light-emitting module group 201 are electrically connected to the first node P of the light-emitting module group 201, and the first end 131 of the feedback line 13 is electrically connected to at least two first nodes P. Preferably, the current levels of the multiple driver chips 22 in the same light-emitting module group 201 are the same, and the current values ​​on the multiple second ends 132 of the feedback line 13 electrically connected to the multiple light-emitting modules 20 in the same light-emitting module group 201 are equal. In this case, N in Formula 1 i Refers to the current gear corresponding to the driver chip 22 in the i-th row, I FBi It refers to the current value on the second end 132 of the feedback line 13 electrically connected to the driving chip 22 in the i-th row.

[0030] In an embodiment of the present application, the light-emitting substrate adjusts the power supply voltage value based on the power supply voltage variation value obtained by Formula 1. Specifically, when the feedback signal provided by the driver chip 22 indicates that the voltage difference between the power supply voltage and the driving voltage required for the light-emitting unit 21 to emit light is greater than a preset threshold, the light-emitting substrate reduces the power supply voltage based on the power supply voltage variation value to obtain a target power supply voltage. Correspondingly, when the feedback signal provided by the driver chip 22 indicates that the voltage difference between the power supply voltage and the driving voltage required for the light-emitting unit 21 to emit light is less than a preset threshold, the light-emitting substrate increases the power supply voltage based on the power supply voltage variation value to obtain the target power supply voltage.

[0031] In an embodiment of the present application, the value range of the preset threshold value includes 0.6 volts to 1.5 volts. Specifically, the preset threshold value includes 0.6 volts, 0.7 volts, 0.8 volts, 0.9 volts, 1.0 volts, 1.1 volts, 1.2 volts, 1.3 volts, 1.4 volts, and 1.5 volts. Preferably, the preset threshold value is 0.6 volts. That is, when the voltage difference between the power supply voltage provided by the power module 10 and the driving voltage required for the light-emitting unit 21 to emit light is greater than 0.6 volts, a gear current smaller than the initial gear current is selected as the target gear current. Correspondingly, when the voltage difference between the power supply voltage provided by the power module 10 and the driving voltage required for the light-emitting unit 21 to emit light is less than 0.6 volts, a gear current larger than the initial gear current is selected as the target gear current.

[0032] In the embodiment of the present application, the multiple second ends 122 of the power line 12 are respectively electrically connected to the multiple light-emitting modules 20. Specifically, the multiple second ends 122 of the power line 12 that are respectively electrically connected to the multiple light-emitting modules 20 in the same light-emitting module group 201 are electrically connected to the second node N of the light-emitting module group 201. The light-emitting module group 201 includes a first light-emitting module group 201a and multiple second light-emitting module groups 201b. The first light-emitting module group 201a is also electrically connected to the first end 121 of the power line 12. The first light-emitting module group 201a and the multiple second light-emitting module groups 201b are electrically connected via the second node N.

[0033] As shown in Figure 3, an embodiment of the present application provides a light-emitting substrate 200. The difference between the light-emitting substrate 200 and the light-emitting substrate 100 is that the multiple second ends 122 of the power line 12 that are respectively electrically connected to the multiple light-emitting modules 20 in the same light-emitting module group 201 are electrically connected to the second node N of the light-emitting module group 201, and the first end 121 of the power line 12 is electrically connected to at least two second nodes N.

[0034] Specifically, the backlight driver 200 includes a power module 10 and multiple light-emitting modules 20. The power module 10 includes a power supply unit 11, a power line 12, and a feedback line 13. The power supply unit 11 includes a voltage output terminal 111 and a signal receiving terminal 112. The power line 12 and the feedback line 13 each have a first end and multiple second ends. The first end 121 of the power line 12 is electrically connected to the voltage output terminal 111, and the first end 131 of the feedback line 13 is electrically connected to the signal receiving terminal 112. The power module 10 is configured to control the output of a power voltage from the voltage output terminal 111 based on a feedback signal received by the signal receiving terminal 112. The light-emitting module 20 includes a light-emitting unit 21 and a driver chip 22. The driver chip 22 includes a first pin 221 and a second pin 222. The anode A of the light-emitting unit 21 is electrically connected to the second end 122 of the power line 12, and the cathode C of the light-emitting unit 21 is electrically connected to the first pin 221 of the driver chip 22. The second pin 222 of the driver chip 22 is electrically connected to the second end 132 of the feedback line 13. The driver chip 22 is used to drive the corresponding light-emitting unit 21 to emit light, and output a feedback signal to the power supply unit 11 based on the power supply voltage.

[0035] Specifically, the plurality of light-emitting modules 20 include at least two light-emitting module groups 201, each of which includes a plurality of light-emitting modules 20 arranged along a first direction X. The at least two light-emitting module groups 201 are arranged along a second direction Y, where the first direction X is perpendicular to the second direction Y. The plurality of second ends 132 of the feedback lines 13 electrically connected to the plurality of light-emitting modules 20 in the same light-emitting module group 201 are electrically connected to a first node P of the light-emitting module group 201, and the first end 131 of the feedback line 13 is electrically connected to at least two first nodes P.

[0036] As shown in FIG4 , an embodiment of the present application provides a light-emitting substrate 300 . The difference between the light-emitting substrate 300 and the light-emitting substrate 100 is that the power module 10 further includes a resistor 30 , which is electrically connected to each first node P and the first end 131 of the feedback line 13 .

[0037] Specifically, the backlight driver 300 includes a power module 10 and a plurality of light-emitting modules 20. The power module 10 includes a power supply unit 11, a resistor 30, a power line 12, and a feedback line 13. The power supply unit 11 includes a voltage output terminal 111 and a signal receiving terminal 112. The power line 12 and the feedback line 13 each have a first end and multiple second ends. The first end 121 of the power line 12 is electrically connected to the voltage output terminal 111, and the first end 131 of the feedback line 13 is electrically connected to the signal receiving terminal 112. The power module 10 is configured to control the voltage output terminal 111 to output a power voltage based on a feedback signal received by the signal receiving terminal 112. The light-emitting module 20 includes a light-emitting unit 21 and a driver chip 22. The driver chip 22 includes a first pin 221 and a second pin 222. The anode A of the light-emitting unit 21 is electrically connected to the second end 122 of the power line 12, and the cathode C of the light-emitting unit 21 is electrically connected to the first pin 221 of the driver chip 22. The second pin 222 of the driver chip 22 is electrically connected to the second end 132 of the feedback line 13. The driver chip 22 is used to drive the corresponding light-emitting unit 21 to emit light, and output a feedback signal to the power supply unit 11 based on the voltage difference between the power supply voltage and the driving voltage required for the light-emitting unit to emit light.

[0038] Specifically, the plurality of light-emitting modules 20 include at least two light-emitting module groups 201, each of which includes a plurality of light-emitting modules 20 arranged along a first direction X. The at least two light-emitting module groups 201 are arranged along a second direction Y, where the first direction X is perpendicular to the second direction Y. The plurality of second ends 132 of the feedback lines 13 electrically connected to the plurality of light-emitting modules 20 in the same light-emitting module group 201 are electrically connected to a first node P of the light-emitting module group 201, and the first end 131 of the feedback line 13 is electrically connected to at least two first nodes P.

[0039] In the embodiment of the present application, the multiple second ends 122 of the power line 12 are respectively electrically connected to the multiple light-emitting modules 20. Specifically, the multiple second ends 122 of the power line 12 that are respectively electrically connected to the multiple light-emitting modules 20 in the same light-emitting module group 201 are electrically connected to the second node N of the light-emitting module group 201. The light-emitting module group 201 includes a first light-emitting module group 201a and multiple second light-emitting module groups 201b. The first light-emitting module group 201a is also electrically connected to the first end 121 of the power line 12. The first light-emitting module group 201a and the multiple second light-emitting module groups 201b are electrically connected via the second node N.

[0040] In the embodiment of the present application, the resistance of the resistor 30 is positively correlated with the length of the power line 12 from the corresponding light-emitting module group 201 to the voltage output terminal 121 . Specifically, different light-emitting modules 20 are at different distances from the voltage output terminal 111 of the power supply module 10. A voltage drop will occur during the transmission of the power supply voltage due to the influence of the resistor 30 on the power line 12, so that the power supply voltage received by the light-emitting module 20 farther from the voltage output terminal 111 is lower than the power supply voltage received by the light-emitting module 20 closer to the voltage output terminal 111. Therefore, the embodiment of the present application sets resistors 30 of different resistance values ​​on the feedback line 13, so that the resistors 30 electrically connected to different light-emitting module groups 201 have different control weights for the change value of the voltage. Among them, the control weight of the resistor 30 electrically connected to the light-emitting module group 201 farther from the voltage output terminal 111 for the change value of the voltage is higher than the control weight of the resistor 30 electrically connected to the light-emitting module group 201 closer to the voltage output terminal 111 for the change value of the voltage, which is beneficial to shortening the time required for dynamic voltage regulation. At the same time, it ensures that the light-emitting module 20 farther from the voltage output terminal 111 quickly reaches the target driving voltage value, thereby improving brightness uniformity.

[0041] In the embodiment of the present application, the change value of the power supply voltage is calculated according to Formula 2:

[0042] (Formula 2)

[0043] Among them, ΔVLED refers to the change in power supply voltage, R i Refers to the resistor 30 electrically connected to the i-th light emitting module group 201, N i Refers to the current gear corresponding to the i-th driver chip 22, I FBi It refers to the current value on the second end 132 of the feedback line 13 electrically connected to the i-th driver chip 22 .

[0044] In the examples of this application, R i The resistance of is greater than that of R1. This setting is beneficial to shortening the time required for dynamic voltage regulation. At the same time, it ensures that the light-emitting module 20 far away from the voltage output terminal 111 quickly reaches the target driving voltage value, thereby improving brightness uniformity.

[0045] As shown in FIG5 , an embodiment of the present application provides a light-emitting substrate 400. The difference between light-emitting substrate 400 and light-emitting substrate 100 is that the light-emitting substrate further includes a compensation region 101, which is provided with multiple light-emitting module groups 201 and a resistor 30. Resistors 30 are provided between at least some of the multiple light-emitting module groups 201 located in the compensation region 101 and the first end 131 of the feedback line 13. The resistance of resistor 30 is positively correlated with the length of the power line 12 from the corresponding light-emitting module group 201 to the voltage output terminal 121.

[0046] Specifically, the number of compensation areas 101 can be 2, 3, 4, ... n, where n is a positive integer. The number of light-emitting module groups 201 in each compensation area 101 can be 2, 3, 4, ... n, where n is a positive integer. The number of resistors 30 provided in each compensation area 101 can be 1, 2, 3, 4, ... n, where n is a positive integer, and the number of resistors 30 in each compensation area 101 can be equal or unequal. In FIG5 , only one compensation area 101 is provided, and one compensation area 101 includes three light-emitting module groups 201, wherein a resistor 30 is provided between two of the light-emitting module groups 201 and the power module 10.

[0047] Specifically, the backlight driver 400 includes a power module 10 and a plurality of light-emitting modules 20. The power module 10 includes a power supply unit 11, a resistor 30, a power line 12, and a feedback line 13. The power supply unit 11 includes a voltage output terminal 111 and a signal receiving terminal 112. The power line 12 and the feedback line 13 each have a first end and multiple second ends. The first end 121 of the power line 12 is electrically connected to the voltage output terminal 111, and the first end 131 of the feedback line 13 is electrically connected to the signal receiving terminal 112. The power module 10 is configured to control the voltage output terminal 111 to output a power voltage based on a feedback signal received by the signal receiving terminal 112. The light-emitting module 20 includes a light-emitting unit 21 and a driver chip 22. The driver chip 22 includes a first pin 221 and a second pin 222. The anode A of the light-emitting unit 21 is electrically connected to the second end 122 of the power line 12, and the cathode C of the light-emitting unit 21 is electrically connected to the first pin 221 of the driver chip 22. The second pin 222 of the driver chip 22 is electrically connected to the second end 132 of the feedback line 13. The driver chip 22 is used to drive the corresponding light emitting unit 21 to emit light and output a feedback signal to the power supply unit 11 based on the power supply voltage.

[0048] Specifically, the plurality of light-emitting modules 20 include at least two light-emitting module groups 201, each of which includes a plurality of light-emitting modules 20 arranged along a first direction X. The at least two light-emitting module groups 201 are arranged along a second direction Y, where the first direction X is perpendicular to the second direction Y. The plurality of second ends 132 of the feedback lines 13 electrically connected to the plurality of light-emitting modules 20 in the same light-emitting module group 201 are electrically connected to a first node P of the light-emitting module group 201, and the first end 131 of the feedback line 13 is electrically connected to at least two first nodes P.

[0049] In the embodiment of the present application, the multiple second ends 122 of the power line 12 are respectively electrically connected to the multiple light-emitting modules 20. Specifically, the multiple second ends 122 of the power line 12 that are respectively electrically connected to the multiple light-emitting modules 20 in the same light-emitting module group 201 are electrically connected to the second node N of the light-emitting module group 201. The light-emitting module group 201 includes a first light-emitting module group 201a and multiple second light-emitting module groups 201b. The first light-emitting module group 201a is also electrically connected to the first end 121 of the power line 12. The first light-emitting module group 201a and the multiple second light-emitting module groups 201b are electrically connected via the second node N.

[0050] As shown in FIG6 , an embodiment of the present application provides a light-emitting substrate 500. The difference between the light-emitting substrate 500 and the light-emitting substrate 100 is that the power module 10 further includes a resistor 30, which is disposed between two adjacent light-emitting module groups 201. The resistance of the resistor 30 is positively correlated with the length of the power line 12 from the corresponding light-emitting module group 201 to the voltage output terminal 121.

[0051] Specifically, the backlight driver 500 includes a power module 10 and a plurality of light-emitting modules 20. The power module 10 includes a power supply unit 11, a resistor 30, a power line 12, and a feedback line 13. The power supply unit 11 includes a voltage output terminal 111 and a signal receiving terminal 112. The power line 12 and the feedback line 13 each have a first end and multiple second ends. The first end 121 of the power line 12 is electrically connected to the voltage output terminal 111, and the first end 131 of the feedback line 13 is electrically connected to the signal receiving terminal 112. The power module 10 is configured to control the voltage output terminal 111 to output a power voltage based on a feedback signal received by the signal receiving terminal 112. The light-emitting module 20 includes a light-emitting unit 21 and a driver chip 22. The driver chip 22 includes a first pin 221 and a second pin 222. The anode A of the light-emitting unit 21 is electrically connected to the second end 122 of the power line 12, and the cathode C of the light-emitting unit 21 is electrically connected to the first pin 221 of the driver chip 22. The second pin 222 of the driver chip 22 is electrically connected to the second end 132 of the feedback line 13. The driver chip 22 is used to drive the corresponding light emitting unit 21 to emit light and output a feedback signal to the power supply unit 11 based on the power supply voltage.

[0052] Specifically, the plurality of light-emitting modules 20 include at least two light-emitting module groups 201, each of which includes a plurality of light-emitting modules 20 arranged along a first direction X. The at least two light-emitting module groups 201 are arranged along a second direction Y, where the first direction X is perpendicular to the second direction Y. The plurality of second ends 132 of the feedback lines 13 electrically connected to the plurality of light-emitting modules 20 in the same light-emitting module group 201 are electrically connected to a first node P of the light-emitting module group 201, and the first end 131 of the feedback line 13 is electrically connected to at least two first nodes P.

[0053] In the embodiment of the present application, the multiple second ends 122 of the power line 12 are respectively electrically connected to the multiple light-emitting modules 20. Specifically, the multiple second ends 122 of the power line 12 that are respectively electrically connected to the multiple light-emitting modules 20 in the same light-emitting module group 201 are electrically connected to the second node N of the light-emitting module group 201. The light-emitting module group 201 includes a first light-emitting module group 201a and multiple second light-emitting module groups 201b. The first light-emitting module group 201a is also electrically connected to the first end 121 of the power line 12. The first light-emitting module group 201a and the multiple second light-emitting module groups 201b are electrically connected via the second node N.

[0054] As shown in FIG7 , the present application further provides a driving method, which is applied to the above-mentioned light-emitting substrate, comprising:

[0055] S10: Acquire an initial power supply voltage value provided by the power supply module and a driving voltage value required for the light-emitting module to emit light.

[0056] Specifically, the light emitting module includes a light emitting unit and a driving chip. Acquiring the driving voltage value required for the light emitting module to emit light in step S10 refers to acquiring the driving voltage value required for the light emitting unit to emit light.

[0057] S20: Calculate the voltage difference between the initial power supply voltage value and the driving voltage value.

[0058] Specifically, the anode of the light emitting unit is electrically connected to the power module, the cathode of the light emitting unit is electrically connected to the driver chip, and the voltage difference between the initial power supply voltage value and the driving voltage value is the voltage value input to the driver chip.

[0059] S30. Output a feedback signal according to the voltage difference.

[0060] S40: Adjust the initial power supply voltage value to the target power supply voltage value according to the feedback signal.

[0061] Specifically, the driver chip generates a corresponding feedback signal based on the detected voltage difference and outputs the feedback signal to the power module. The smaller the strength of the feedback signal, the greater the initial power voltage output by the power module; conversely, the greater the strength of the feedback signal, the smaller the initial power voltage output by the power module.

[0062] As shown in FIG8 , step S30 includes:

[0063] S301: Obtain the initial gear current of the light-emitting module.

[0064] S302: Determine whether the voltage difference is greater than a preset threshold.

[0065] S303: Adjust the initial gear current to the target gear current according to the judgment result.

[0066] Specifically, if the voltage difference is greater than a preset threshold, the initial gear current is reduced to the target gear current. If the voltage difference is less than the preset threshold, the initial gear current is increased to the target gear current.

[0067] S304 , outputting a feedback signal according to the target driving current value corresponding to the target gear current.

[0068] S305 : Adjust the initial power supply voltage value to the target power supply voltage value according to the feedback signal.

[0069] In the embodiment of the present application, the preset threshold value ranges from 0.6 V to 1.5 V. When the voltage difference between the power supply voltage and the driving voltage required for the light-emitting unit to emit light is between 0.6 V and 1.5 V, it is beneficial to extend the service life of the driver chip and improve the display effect of the light-emitting substrate.

[0070] The above is a detailed introduction to a light-emitting substrate and a driving method provided in the embodiments of the present application. The description of the above embodiments is only used to help understand the core idea of ​​the present application, and the above description should not be understood as limiting the scope of protection of the present application.

Claims

1. A light-emitting substrate, comprising: A power module, the power module comprising a power supply unit, a power line and a feedback line, the power supply unit comprising a voltage output end and a signal receiving end, the power line and the feedback line each having a first end and a plurality of second ends, the first end of the power line being electrically connected to the voltage output end, the first end of the feedback line being electrically connected to the signal receiving end, the power module being used to control the voltage output end to output a power supply voltage based on a feedback signal received by the signal receiving end; A plurality of light-emitting modules are respectively electrically connected to the second end of the power line, and the plurality of light-emitting modules are respectively electrically connected to the second end of the feedback line, and the light-emitting modules are used to emit light under the drive of the power supply voltage and output the feedback signal to the power supply unit based on the power supply voltage.

2. The light-emitting substrate according to claim 1, wherein: The light-emitting module includes a light-emitting unit and a driving chip, the driving chip includes a first pin and a second pin, the anode of the light-emitting unit is electrically connected to the second end of the power line, the cathode of the light-emitting unit is electrically connected to the first pin of the driving chip, and the second pin of the driving chip is electrically connected to the second end of the feedback line.

3. The light-emitting substrate according to claim 2, wherein: The plurality of light emitting modules are divided into at least two light emitting module groups, the light emitting module groups include a plurality of light emitting modules arranged along a first direction, at least two of the light emitting module groups are arranged along a second direction, and the first direction intersects the second direction.

4. The light-emitting substrate according to claim 3, wherein: The plurality of second ends of the feedback line electrically connected to the plurality of light-emitting modules in the same light-emitting module group are electrically connected to a first node of the light-emitting module group, and the first end of the feedback line is electrically connected to at least two of the first nodes.

5. The light-emitting substrate according to claim 3 or 4, wherein: A plurality of second ends of the power line electrically connected to a plurality of the light emitting modules in the same light emitting module group are electrically connected to a second node of the light emitting module group, and a first end of the power line is electrically connected to at least two of the second nodes.

6. The light emitting substrate according to claim 4, wherein: The power supply module further includes a resistor, and the resistor is arranged between at least part of the light emitting module groups among the plurality of light emitting module groups and the first end of the feedback line.

7. The light-emitting substrate according to claim 6, wherein: The light-emitting substrate further comprises a compensation area, wherein the compensation area is provided with a plurality of the light-emitting module groups; The resistor is disposed between at least some of the light emitting module groups among the plurality of light emitting module groups located in the compensation area and the first end of the feedback line.

8. The light emitting substrate according to claim 6, wherein: The resistor is electrically connected to each of the first nodes and the first end of the feedback line.

9. The light emitting substrate according to claim 6, wherein: The power supply module further includes a resistor, and the resistor is arranged between two adjacent light emitting module groups.

10. The light emitting substrate according to claim 6, wherein: The resistance value of the resistor is positively correlated with the length of the power line from the corresponding light emitting module group to the voltage output terminal.

11. The light emitting substrate according to claim 4, wherein: The current levels of the multiple driving chips in the same light emitting module group are the same.

12. The light emitting substrate according to claim 4, wherein: The current values ​​at the multiple second ends of the feedback lines electrically connected to the multiple light-emitting modules in the same light-emitting module group are equal.

13. The light emitting substrate according to claim 1, wherein: The power supply unit includes an AC-DC converter, which includes a voltage input terminal, a voltage output terminal and a signal receiving terminal. The voltage input terminal is used to receive an AC voltage, the signal receiving terminal is used to receive the feedback signal, and the voltage output terminal is used to control the output of the power supply voltage based on the feedback signal.

14. A driving method, comprising: Obtaining an initial power supply voltage value provided by the power supply module and a driving voltage value required for the light-emitting module to emit light; Calculating a voltage difference between the initial power supply voltage value and the driving voltage value; Output a feedback signal according to the voltage difference; The initial power supply voltage value is adjusted to a target power supply voltage value according to the feedback signal.

15. The driving method according to claim 14, wherein: The step of outputting a feedback signal according to the voltage difference and adjusting the initial power supply voltage value to a target power supply voltage value according to the feedback signal comprises: Obtaining the initial gear current of the light emitting module; Determining whether the voltage difference is greater than a preset threshold; Adjusting the initial gear current to the target gear current according to the judgment result; Outputting a feedback signal according to the target driving current value corresponding to the target gear current; The initial power supply voltage value is adjusted to a target power supply voltage value according to the feedback signal.

16. The driving method according to claim 15, wherein: The step of adjusting the initial gear current to the target gear current according to the judgment result comprises: If the voltage difference is greater than the preset threshold, the initial gear current is reduced to the target gear current.

17. The driving method according to claim 15, wherein: The step of adjusting the initial gear current to the target gear current according to the judgment result comprises: If the voltage difference is less than the preset threshold, the initial gear current is increased to the target gear current.

18. The driving method according to claim 15, wherein: The step of obtaining the initial gear current of the light emitting module comprises: Setting a plurality of current levels according to the display brightness range of the light-emitting module, and establishing a corresponding relationship between the light-emitting brightness of the light-emitting module and the driving current; Obtaining a current range according to a maximum current value corresponding to the maximum display brightness and a minimum current value corresponding to the minimum display brightness; The initial gear current of the light emitting module is acquired according to the current range.

19. The driving method according to claim 15, wherein: The initial gear current is a median value among the multiple gear currents.

20. The driving method according to claim 14, wherein: The preset threshold value has a value range of 0.6 volts to 1.5 volts.

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