Light-emitting substrate and driving method

Abstract

The present application discloses a light emitting substrate and a driving method. The light emitting substrate includes: a power supply module, where the power supply module includes a power supply unit, a power supply line and a feedback line, the power supply unit includes a voltage output terminal and a signal receiving terminal, and the power supply module is configured to control the voltage output terminal to output a power supply voltage based on a feedback signal received by the signal receiving terminal; and a plurality of light emitting modules configured to be driven by the power supply voltage to emit light and output the feedback signal to the power supply unit based on the power supply voltage.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of display technologies, and more particularly to a light emitting substrate and a driving method.BACKGROUND

[0002] Either of a micro light emitting diode display device and a mini light emitting diode display device may include thousands of light emitting diodes. In order to drive any one of the light emitting diodes to emit light, a conventional light emitting substrate may be provided with an Alternating Current (AC)-Direct Current (DC) power supply module for converting an AC voltage supplied from an external power supply into a DC voltage and a DC-DC power supply module for converting the DC voltage supplied from the AC-DC power supply module into a driving voltage for driving the light emitting diode to emit light.

[0003] The conventional light emitting substrate are provided with a plurality of DC-DC power supply modules for respectively providing driving voltages to the light emitting diodes in respective areas, so that the conventional light emitting substrate may have a complex circuit structure and its cost is too high.SUMMARY

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

[0005] In one aspect, an embodiment of the present application provides a light emitting substrate, including: a power supply module, where the power supply module includes a power supply unit, a power supply line and a feedback line, the power supply unit includes a voltage output terminal and a signal receiving terminal, both the power supply line and the feedback line have a first end and a plurality of second ends, the first end of the power supply line is electrically connected to the voltage output terminal, the first end of the feedback line is electrically connected to the signal receiving terminal, and the power supply module is configured to control the voltage output terminal to output a power supply voltage based on a feedback signal received by the signal receiving terminal; and a plurality of light emitting modules respectively connected to the second ends of the power supply line and the second ends of the feedback line, where each of the light emitting modules is configured to be driven by the power supply voltage to emit light and output the feedback signal to the power supply unit based on the power supply voltage.

[0006] In another aspect, another embodiment of the present application further provides a driving method, including: obtaining an initial power supply voltage value provided by a power supply module and a driving voltage value required to drive a light emitting module to emit light; calculating a voltage difference between the initial supply voltage value and the driving voltage value; outputting a feedback signal according to the voltage difference value; and adjusting the initial power supply voltage value to be a target power supply voltage value according to the feedback signal.BENEFICIAL EFFECTS

[0007] The present application provides the light emitting substrate and the driving method. The light emitting substrate includes: the power supply module, where the power supply module includes the power supply unit, the power supply line and the feedback line, the power supply unit includes the voltage output terminal and the signal receiving terminal, both the power supply line and the feedback line have the first end and the plurality of second ends, the first end of the power supply line is electrically connected to the voltage output terminal, the first end of the feedback line is electrically connected to the signal receiving terminal, and the power supply module is configured to control the voltage output terminal to output the power supply voltage based on the feedback signal received by the signal receiving terminal; and the plurality of light emitting modules respectively connected to the second ends of the power supply line and the second ends of the feedback line, where each of the light emitting modules is configured to be driven by the power supply voltage to emit light and output the feedback signal to the power supply unit based on the power supply voltage. In the light emitting substrate, the power supply line and the feedback line in the power supply module are provided with the plurality of second ends, where the plurality of light emitting modules are electrically connected with the plurality of second ends of the power supply line and the plurality of second ends of the feedback line, respectively. That is, the power supply module is provided to supply power supply voltages for all of light emitting modules and reduce the number of the used power supply modules, so that the circuit structure of the light emitting substrate can be simplified, its cost can be greatly reduced, and product competitiveness of the light emitting substrate can be improved.BRIEF DESCRIPTION OF THE DRAWINGS

[0008] FIG. 1 is a block diagram of a light emitting substrate according to an embodiment of the present application. FIG. 2 is a first diagram of a light emitting substrate according to an embodiment of the present application. FIG. 3 is a second diagram of a light emitting substrate according to an embodiment of the present application. FIG. 4 is a third diagram of a light emitting substrate according to an embodiment of the present application. FIG. 5 is a fourth diagram of a light emitting substrate according to an embodiment of the present application. FIG. 6 is a fifth diagram of a light emitting substrate according to an embodiment of the present application. FIG. 7 is a flowchart of a driving method according to an embodiment of the present application. FIG. 8 is a flowchart of step S30 in FIG. 7. DETAILED DESCRIPTION

[0009] Technical solutions in embodiments of the present application will be described below in conjunction with drawings in the embodiments of the present application. The described technical solution is for the purpose of explanation and description of the idea of the present application only, and should not be construed as limiting the scope of protection of the present application.

[0010] As shown in FIG. 1, an embodiment of the present application provides a light emitting substrate 100, including a power supply module 10 and a plurality of light emitting modules 20, where the power supply module 10 includes a power supply unit 11, a power supply line 12, and a feedback line 13. The power supply unit 11 includes a voltage output terminal 111 and a signal receiving terminal 112. Both the power supply line 12 and the feedback line 13 have a first end and a plurality of second ends. The first end 121 of the power supply line 12 is electrically connected to the voltage output end 111, and the first end 131 of the feedback line 13 is electrically connected to the signal receiving end 112. The power supply module 10 is configured to control the voltage output terminal 111 to output a power supply voltage 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 ends 122 of the power supply line 12, and the plurality of light emitting modules 20 are respectively electrically connected to the second ends 132 of the feedback line 13. Each of the light emitting modules 20 is configured to be driven by the power supply voltage to emit light and output the feedback signal to the power supply unit 11 based on the power supply voltage.

[0011] In the light emitting substrate provided in the present application, since both the power supply line 12 and the feedback line 13 in the power supply module 10 are provided with the plurality of second ends, where the plurality of light emitting modules 20 are electrically connected with the plurality of second ends 122 of the power supply line 12 and the plurality of second ends of the feedback line 13, respectively. That is, the power supply module 10 is provided to supply power supply voltages for all of light emitting modules 20 and reduce the number of the used power supply modules 10, so that the circuit structure of the light emitting substrate can be simplified, its cost can be greatly reduced, and product competitiveness of the light emitting substrate can be improved.

[0012] In an embodiment of the present application, the light emitting substrate 100 further includes a substrate on which at least a portion of the light emitting modules 20 and the power supply module 10 are disposed. Specifically, the light emitting substrate can be applied to any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, or the like.

[0013] In the embodiment of the present application, the power supply unit 11 includes an AC-DC converter, where the AC-DC converter includes a voltage input terminal for receiving an AC voltage, a signal receiving terminal for receiving a feedback signal, and a voltage output terminal for controlling output of the power supply voltage based on the feedback signal. Specifically, the power supply unit 11 is configured to receive an AC voltage supplied from an external power source, for example, an AC voltage of 220 volts at home, and convert the AC voltage into a DC voltage for driving a light emitting module 20 to emit light. The power supply unit 11 dynamically adjusts a magnitude of the power supply voltage according to the feedback signal. For example, when the power supply voltage does not match the driving voltage required to drive 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 according to the feedback signal to ensure that the light emitting module 20 emits light normally. Meanwhile, when a voltage difference between the power supply voltage and the driving voltage is greater than a preset threshold value, the power supply voltage is reduced according to the feedback signal, thereby preventing a driving chip heating and reducing the power consumption.

[0014] As shown in FIG. 2, the light emitting module 20 includes a light emitting unit 21 and a driving chip 22. The driving chip 22 includes a first pin 221 and a second pin 222. The light emitting unit 21 has an anode A electrically connected to one of the second ends 122 of the power supply line 12 and a cathode C electrically connected to the first pin 221 of the driving chip 22. The second pin 222 of the driving chip 22 is electrically connected to one of the second ends 132 of the feedback line 13. Specifically, the light emitting unit 21 may be a light emitting diode, or a string of light emitting diodes string formed by sequentially connecting a plurality of light emitting diodes in series. Each of driving chips 22 is electrically connected in series with at least one light emitting diode or at least one string of light emitting diodes and configured for driving corresponding light emitting unit to emit light.

[0015] In an embodiment of the present application, a plurality of levels of current are set in advance on the basis of the display brightness range in the driving chip 22, and a correspondence between the light emitting brightness of the light emitting unit 21 and the driving current is established. The light emitting brightness is positively correlated with the driving current. That is, the larger the light emitting brightness is, the larger the driving current is. The lower the light emitting intensity is, the lower the driving current is. The current range can be determined by determining the maximum current corresponding to the maximum display brightness and the minimum current corresponding to the minimum display brightness. For example, when the maximum current corresponding to the maximum display brightness of 1600 candela per square meter is 7 mA and the minimum current corresponding to the minimum display brightness of 600 candela per square meter is 1 mA, the current range is 1 mA to 7 mA.

[0016] Further, a plurality of current values in the current range are set to levels of the current. There are at least two levels of current, i.e., a maximum current value and a minimum current value of the current range respectively corresponding to one of the levels of the current. On the basis of this, it is also possible to select a current value as one of the levels of the current at a fixed interval between the maximum current value and the minimum current value. For example, a plurality of current values in the current range include four levels of the current, i.e., 1 mA, 3 mA, 5 mA, and 7 mA, respectively. Further, each of the plurality of levels of current have a correspondence with a gray scale. The larger the level of current is, the larger the gray scale is. The lower the level of current is, the lower the gray scale is. There are a plurality of levels of the current. The driving chip may adjust the initial level of current to a corresponding target level of current according to the power supply voltage.

[0017] In the embodiment of the present application, a median value of the plurality of levels of current is used as the initial level of current. When the voltage difference between the power supply voltage supplied from the power supply module 10 and the driving voltage required to drive the light emitting unit 21 to emit light is greater than a preset threshold value, the level of current of the driving chip is negatively adjusted, that is, the level of current less than the initial level of current is selected as the target level of current. Correspondingly, when the voltage difference between the power supply voltage supplied from the power supply module 10 and the driving voltage required to drive the light emitting unit 21 to emit light is less than the preset threshold value, the level current of the driving chip is forward adjusted, that is, the level of current greater than the initial level of current is selected as the target level of current. The light emitting substrate adjusts the magnitude of the power supply voltage according to the level of current of the light emitting unit 21 and the current at the second end 132 of the feedback line 13 electrically connected to the driving chip 22 corresponding to the light emitting unit 21.

[0018] Specifically, the change value of the power supply voltage is calculated according to Equation 1: Δ VLED = N 1 ∗ I FB 1 + ⋯ N i ∗ I FB i Where ΔVLED refers to the change value of the power supply voltage, N i refers to the level of current corresponding to the i-th driving chip 22, and I FBi refers to the current value at the second end 132 of the feedback line 13 electrically connected to the i-th driving chip 22.

[0019] In an embodiment of the present application, the plurality of light emitting modules 20 are divided into at least two groups of light emitting modules 201 including a plurality of light emitting modules 20 arranged in a first direction X. At least two groups of light emitting modules 201 are arranged in a second direction Y, where 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 a length direction of the display panel, and the second direction is a 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.

[0020] In an embodiment of the present application, each of a plurality of second ends 132 of the feedback line 13 respectively electrically connected to a plurality of light emitting modules 20 in the same group of light emitting modules 201 are electrically connected to one of first nodes P of the group of light emitting modules 201, and the first end 131 of the feedback line 13 is electrically connected to at least two first nodes P. Preferably, the plurality of driving chips 22 in the same group of light emitting modules 201 have the same level of current, and current values at the second ends 132 of the feedback line 13 electrically connected to the plurality of light emitting modules 20 in the same group of light emitting modules 201 are equal to each other. In this case, Ni in Equation 1 refers to the level of current corresponding to the i-th row of driving chips 22, and I FBi refers to the current value at the second ends 132 of the feedback line 13 electrically connected to the i-th row of driving chips 22.

[0021] In an embodiment of the present application, the light emitting substrate adjusts the power supply voltage according to the change value of the power supply voltage obtained in Equation 1. Specifically, when the feedback signal provided by the driving chip 22 indicates that a voltage difference between the power supply voltage and the driving voltage required to drive the light emitting unit 21 to emit light is greater than a preset threshold value, the light emitting substrate decreases the power supply voltage according to the change value of the power supply voltage to obtain a target power supply voltage. Correspondingly, when the feedback signal provided by the driving chip 22 indicates that the voltage difference between the power supply voltage and the driving voltage required to drive the light emitting unit 21 to emit light is less than the preset threshold value, the power supply voltage is increased according to the change value of the power supply voltage to obtain the target supply voltage.

[0022] In an embodiment of the present application, the preset threshold value is in the range of 0.6 V to 1.5 V. Specifically, the preset threshold value includes one of 0.6 V, 0.7 V, 0.8 V, 0.9 V, 1.0 V, 1.1 V, 1.2 V, 1.3 V, 1.4 V, or 1.5 V. Preferably, the preset threshold is 0.6 V. That is, when the voltage difference between the power supply voltage supplied from the power supply module 10 and the driving voltage required to drive the light emitting unit 21 to emit light is greater than 0.6 V, the level of current less than the initial level of current is selected as the target level of current. Correspondingly, when the voltage difference between the power supply voltage supplied from the power supply module 10 and the driving voltage required to drive the light emitting unit 21 to emit light is less than 0.6 V, the level of current greater than the initial level of current is selected as the target level of current.

[0023] In an embodiment of the present application, the plurality of second ends 122 of the power supply line 12 are electrically connected to the plurality of light emitting modules 20, respectively. Specifically, each of a plurality of second ends 122 of the power supply line 12 electrically connected to a plurality of light emitting modules 20 in the same group of light emitting modules 201 is electrically connected to one of second nodes N of the group of light emitting modules 201. The groups of light emitting modules 201 includes a first group of light emitting modules 201a and a plurality of second groups of light emitting modules 201b. The first group of light emitting modules 201a is further electrically connected to the first end 121 of the power supply line 12 and electrically connected to the plurality of second groups of light emitting modules 201b through the second nodes N.

[0024] As shown in FIG. 3, an embodiment of the present application provides a light emitting substrate 200. The light emitting substrate 200 differs from the light emitting substrate 100 in that each of a plurality of second ends 122 of the power supply line 12 electrically connected to a plurality of light emitting modules 20 in the same group of light emitting modules 201 is electrically connected to one of second nodes N of the group of light emitting modules 201, and the first end 121 of the power supply line 12 is electrically connected to at least two second nodes N.

[0025] Specifically, the light emitting substrate 200 includes a power supply module 10 and a plurality of light emitting modules 20, where the power supply module 10 includes a power supply unit 11, a power supply line 12, and a feedback line 13. The power supply unit 11 includes a voltage output terminal 111 and a signal receiving terminal 112. Both the power supply line 12 and the feedback line 13 have a first end and a plurality of second ends. The first end 121 of the power supply line 12 is electrically connected to the voltage output end 111, and the first end 131 of the feedback line 13 is electrically connected to the signal receiving end 112. The power supply module 10 is configured to control the voltage output terminal 111 to output a power supply 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 driving chip 22. The driving chip 22 includes a first pin 221 and a second pin 222. The light emitting unit 21 has an anode A electrically connected to one of the second ends 122 of the power supply line 12 and a cathode C electrically connected to the first pin 221 of the driving chip 22. The second pin 222 of the driving chip 22 is electrically connected to one of the second ends 132 of the feedback line 13. The driving chip 22 is configured to drive the light emitting unit 21 corresponding thereto to emit light and output a feedback signal to the power supply unit 11 based on the power supply voltage.

[0026] Specifically, the plurality of light emitting modules 20 are divided into at least two groups of light emitting modules 201 including a plurality of light emitting modules 20 arranged in a first direction X. At least two groups of light emitting modules 201 are arranged in a second direction Y, where the first direction X is perpendicular to the second direction Y. Each of a plurality of second ends 132 of the feedback line 13 respectively electrically connected to a plurality of light emitting modules 20 in the same group of light emitting modules 201 are electrically connected to one of first nodes P of the group of light emitting modules 201, and the first end 131 of the feedback line 13 is electrically connected to at least two first nodes P.

[0027] As shown in FIG. 4, an embodiment of the present application provides a light emitting substrate 300. The light emitting substrate 300 differs from the light emitting substrate 100 in that the power supply module 10 further includes resistors 30 each electrically connected to the first end 131 of the feedback line 13 and one of first nodes P.

[0028] Specifically, the light emitting substrate 300 includes a power supply module 10 and a plurality of light emitting modules 20, where the power supply module 10 includes a power supply unit 11, resistors 30, a power supply line 12, and a feedback line 13. The power supply unit 11 includes a voltage output terminal 111 and a signal receiving terminal 112. Both the power supply line 12 and the feedback line 13 have a first end and a plurality of second ends. The first end 121 of the power supply line 12 is electrically connected to the voltage output end 111, and the first end 131 of the feedback line 13 is electrically connected to the signal receiving end 112. The power supply module 10 is configured to control the voltage output terminal 111 to output a power supply 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 driving chip 22. The driving chip 22 includes a first pin 221 and a second pin 222. The light emitting unit 21 has an anode A electrically connected to one of the second ends 122 of the power supply line 12 and a cathode C electrically connected to the first pin 221 of the driving chip 22. The second pin 222 of the driving chip 22 is electrically connected to one of the second ends 132 of the feedback line 13. The driving chip 22 is configured to drive the light emitting unit 21 corresponding thereto 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 to drive the light emitting unit to emit light.

[0029] Specifically, the plurality of light emitting modules 20 are divided into at least two groups of light emitting modules 201 including a plurality of light emitting modules 20 arranged in a first direction X. At least two groups of light emitting modules 201 are arranged in a second direction Y, where the first direction X is perpendicular to the second direction Y. Each of a plurality of second ends 132 of the feedback line 13 respectively electrically connected to a plurality of light emitting modules 20 in the same group of light emitting modules 201 are electrically connected to one of first nodes P of the group of light emitting modules 201, and the first end 131 of the feedback line 13 is electrically connected to at least two first nodes P.

[0030] In an embodiment of the present application, the plurality of second ends 122 of the power supply line 12 are electrically connected to the plurality of light emitting modules 20, respectively. Specifically, each of a plurality of second ends 122 of the power supply line 12 electrically connected to a plurality of light emitting modules 20 in the same group of light emitting modules 201 is electrically connected to one of second nodes N of the group of light emitting modules 201. The groups of light emitting modules 201 includes a first group of light emitting modules 201a and a plurality of second groups of light emitting modules 201b. The first group of light emitting modules 201a is further electrically connected to the first end 121 of the power supply line 12 and electrically connected to the plurality of second groups of light emitting modules 201b through the second nodes N.

[0031] In an embodiment of the present application, a resistance value of each of the resistors 30 is positively correlated with a length of the power supply line 12 from the corresponding group of light emitting modules 201 to the voltage output terminal 121. Specifically, distances of different light emitting modules 20 from the voltage output terminal 111 of the power supply module 10 are different from each other, and a voltage drop can be generated in the process of transmission of the power supply voltage under the effect of the resistors 30 on the power supply line 12, so that the power supply voltage received by the light emitting module 20 which is farther away from the voltage output terminal 111 is less than the power supply voltage received by the light emitting module 20 which is closer to the voltage output terminal 111. Therefore, the embodiment of the present application disposes the resistors 30 having different resistance values on the feedback line 13, so that the resistors 30 electrically connected to the different groups of light emitting modules 201 have a different control weight on the change value of the power supply voltage, wherein the control weight on the change value of the power supply voltage by a resistor 30 electrically connected to a group of light emitting modules 201 which is farther away from the voltage output terminal 111 is higher than the control weight on the change value of the power supply voltage by a resistor 30 electrically connected to a group of light emitting module 201 which is closer to the voltage output terminal 111, which advantageously shortens the time required for dynamic voltage regulation. Meanwhile, it is ensured that the light emitting module 20, which is farther from the voltage output terminal 111, rapidly reaches the target driving voltage value, thereby improving brightness uniformity.

[0032] In an embodiments of the present application, the change value of the power supply voltage is calculated according to Equation 2: Δ VLED = R 1 ∗ N 1 ∗ I FB 1 + ⋯ R 1 ∗ N i ∗ I FB i Where ΔVLED refers to the change value of the power supply voltage, R i refers to the resistor 30 electrically connected to the i-th group of light emitting modules 201, N i refers to the level of current corresponding to the i-th driving chip 22, and I FBi refers to the current value at the second end 132 of the feedback line 13 electrically connected to the i-th driving chip 22.

[0033] In an embodiment of the present application, a resistance value of R i is greater than a resistance value of R 1 , which facilitates shortening the time required for dynamic voltage regulation, while ensuring that the light emitting module 20, which is farther away from the voltage output terminal 111, rapidly reaches the target driving voltage value, thereby improving brightness uniformity.

[0034] As shown in FIG. 5, an embodiment of the present application provides a light emitting substrate 400, which differs from the light emitting substrate 100 in that the light emitting substrate 400 further includes a compensation region 101 on which a plurality of groups of light emitting modules 201 and resistors 30 are disposed, where one of the resistors 30 is disposed between at least a portion of the plurality of groups of light emitting modules 201 in the compensation region 101 and the first end 131 of the feedback line 13. A resistance value of each of the resistors 30 is positively correlated with a length of the power supply line 12 from the corresponding group of light emitting modules 201 to the voltage output terminal 121.

[0035] Specifically, the number of compensation regions 101 may be one of two, three, four, ..., or n, where n is a positive integer. Specifically, the number of the groups of light emitting modules 201 in each of the compensation regions 101 may be one of two, three, four, ..., or n, where n is a positive integer. The number of resistors 30 disposed in each of the compensation regions 101 may be one of one, two, three, four, ..., or n, where n is a positive integer, and the number of resistors 30 in each of the compensation regions 101 may or may not be equal. In FIG. 5, only one compensation region 101 is disposed, and one compensation region 101 includes three groups of light emitting modules 201, where a resistor 30 is provided between the two groups of the three groups of light emitting modules 201 and the power supply module 10.

[0036] Specifically, the light emitting substrate 400 includes a power supply module 10 and a plurality of light emitting modules 20, where the power supply module 10 includes a power supply unit 11, resistors 30, a power supply line 12, and a feedback line 13. The power supply unit 11 includes a voltage output terminal 111 and a signal receiving terminal 112. Both the power supply line 12 and the feedback line 13 have a first end and a plurality of second ends. The first end 121 of the power supply line 12 is electrically connected to the voltage output end 111, and the first end 131 of the feedback line 13 is electrically connected to the signal receiving end 112. The power supply module 10 is configured to control the voltage output terminal 111 to output a power supply 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 driving chip 22. The driving chip 22 includes a first pin 221 and a second pin 222. The light emitting unit 21 has an anode A electrically connected to one of the second ends 122 of the power supply line 12 and a cathode C electrically connected to the first pin 221 of the driving chip 22. The second pin 222 of the driving chip 22 is electrically connected to one of the second ends 132 of the feedback line 13. The driving chip 22 is configured to drive the light emitting unit 21 corresponding thereto to emit light and output a feedback signal to the power supply unit 11 based on the power supply voltage.

[0037] Specifically, the plurality of light emitting modules 20 are divided into at least two groups of light emitting modules 201 including a plurality of light emitting modules 20 arranged in a first direction X. At least two groups of light emitting modules 201 are arranged in a second direction Y, where the first direction X is perpendicular to the second direction Y. Each of a plurality of second ends 132 of the feedback line 13 respectively electrically connected to a plurality of light emitting modules 20 in the same group of light emitting modules 201 are electrically connected to one of first nodes P of the group of light emitting modules 201, and the first end 131 of the feedback line 13 is electrically connected to at least two first nodes P.

[0038] In an embodiment of the present application, the plurality of second ends 122 of the power supply line 12 are electrically connected to the plurality of light emitting modules 20, respectively. Specifically, each of a plurality of second ends 122 of the power supply line 12 electrically connected to a plurality of light emitting modules 20 in the same group of light emitting modules 201 is electrically connected to one of second nodes N of the group of light emitting modules 201. The groups of light emitting modules 201 includes a first group of light emitting modules 201a and a plurality of second groups of light emitting modules 201b. The first group of light emitting modules 201a is further electrically connected to the first end 121 of the power supply line 12 and electrically connected to the plurality of second groups of light emitting modules 201b through the second nodes N.

[0039] As shown in FIG. 6, an embodiment of the present application provides a light emitting substrate 500. The light emitting substrate 500 differs from the light emitting substrate 100 in that the power supply module 10 further includes resistors 30 each electrically connected between two adjacent groups of light emitting modules 201. A resistance value of each of the resistors 30 is positively correlated with a length of the power supply line 12 from the corresponding group of light emitting modules 201 to the voltage output terminal 121.

[0040] Specifically, the light emitting substrate 500 includes a power supply module 10 and a plurality of light emitting modules 20, where the power supply module 10 includes a power supply unit 11, resistors 30, a power supply line 12, and a feedback line 13. The power supply unit 11 includes a voltage output terminal 111 and a signal receiving terminal 112. Both the power supply line 12 and the feedback line 13 have a first end and a plurality of second ends. The first end 121 of the power supply line 12 is electrically connected to the voltage output end 111, and the first end 131 of the feedback line 13 is electrically connected to the signal receiving end 112. The power supply module 10 is configured to control the voltage output terminal 111 to output a power supply 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 driving chip 22. The driving chip 22 includes a first pin 221 and a second pin 222. The light emitting unit 21 has an anode A electrically connected to one of the second ends 122 of the power supply line 12 and a cathode C electrically connected to the first pin 221 of the driving chip 22. The second pin 222 of the driving chip 22 is electrically connected to one of the second ends 132 of the feedback line 13. The driving chip 22 is configured to drive the light emitting unit 21 corresponding thereto to emit light and output a feedback signal to the power supply unit 11 based on the power supply voltage.

[0041] Specifically, the plurality of light emitting modules 20 are divided into at least two groups of light emitting modules 201 including a plurality of light emitting modules 20 arranged in a first direction X. At least two groups of light emitting modules 201 are arranged in a second direction Y, where the first direction X is perpendicular to the second direction Y. Each of a plurality of second ends 132 of the feedback line 13 respectively electrically connected to a plurality of light emitting modules 20 in the same group of light emitting modules 201 are electrically connected to one of first nodes P of the group of light emitting modules 201, and the first end 131 of the feedback line 13 is electrically connected to at least two first nodes P.

[0042] In an embodiment of the present application, the plurality of second ends 122 of the power supply line 12 are electrically connected to the plurality of light emitting modules 20, respectively. Specifically, each of a plurality of second ends 122 of the power supply line 12 electrically connected to a plurality of light emitting modules 20 in the same group of light emitting modules 201 is electrically connected to one of second nodes N of the group of light emitting modules 201. The groups of light emitting modules 201 includes a first group of light emitting modules 201a and a plurality of second groups of light emitting modules 201b. The first group of light emitting modules 201a is further electrically connected to the first end 121 of the power supply line 12 and electrically connected to the plurality of second groups of light emitting modules 201b through the second nodes N.

[0043] As shown in FIG. 7, the present application further provides a driving method applied to the light emitting substrate described above, including S10-S40.

[0044] At S10, an initial power supply voltage provided by a power supply module and a driving voltage required to drive a light emitting module to emit light are obtained.

[0045] Specifically, the light emitting module includes a light emitting unit and a driving chip, and the obtaining of the driving voltage required to drive the light emitting module to emit light in step S10 refers to obtaining the driving voltage required to drive the light emitting unit to emit light.

[0046] At S20, a voltage difference between the initial power supply voltage and the driving voltage is calculated.

[0047] Specifically, an anode of the light emitting unit is electrically connected to the power supply module, a cathode of the light emitting unit is electrically connected to the driving chip, and the voltage difference between the initial power supply voltage and the driving voltage is a voltage input to the driving chip.

[0048] At S30, a feedback signal is output according to the voltage difference.

[0049] At S40, an initial power supply voltage is adjusted to a target power supply voltage according to the feedback signal.

[0050] Specifically, the driving chip generates a feedback signal according to the detected voltage difference, and outputs the feedback signal to the power supply module, where the less the strength of the feedback signal is, the greater the initial power supply voltage output by the power supply module is. On the contrary, the greater the strength of the feedback signal is, the less the initial power supply voltage output by the power supply module is.

[0051] As shown in FIG. 8, S30 includes S301-S305.

[0052] At S301, an initial level of current of the light emitting module is obtained.

[0053] At S302, whether the voltage difference is greater than a preset threshold is determined.

[0054] At S303, the initial level of current is adjusted to a target level of current according to the determination.

[0055] Specifically, if the voltage difference is greater than the preset threshold value, the initial level of current is reduced to the target level of current. If the voltage difference is less than the preset threshold value, the initial level of current is increased to the target level of current.

[0056] At S304. a feedback signal is output according to a target driving current corresponding to the target level of current.

[0057] At S305, an initial power supply voltage is adjusted to a target power supply voltage according to the feedback signal.

[0058] In an embodiment of the present application, the preset threshold value is in the range of 0.6 V to 1.5 V. When the voltage difference between the power supply voltage and the driving voltage required to drive the light emitting unit to emit light is between 0.6 V and 1.5 V, it is advantageous to prolong the service life of the driving chip and improve the display effect of the light emitting substrate.

[0059] The light emitting substrate and the driving method provided in embodiments of the present application are described in detail above. The description of foregoing embodiments is merely used to help understand a core ideal of the present application, and the foregoing description should not be construed as limiting the scope of protection of the present application.

Claims

1. A light emitting substrate, comprising: a power supply module, wherein the power supply module includes a power supply unit, a power supply line and a feedback line, and wherein the power supply unit includes a voltage output terminal and a signal receiving terminal, both the power supply line and the feedback line have a first end and a plurality of second ends, the first end of the power supply line is electrically connected to the voltage output terminal, the first end of the feedback line is electrically connected to the signal receiving terminal, and the power supply module is configured to control the voltage output terminal to output a power supply voltage based on a feedback signal received by the signal receiving terminal; and a plurality of light emitting modules respectively connected to the second ends of the power supply line and the second ends of the feedback line, wherein each of the light emitting modules is configured to be driven by the power supply voltage to emit light and output the feedback signal to the power supply unit based on the power supply voltage.

2. The light emitting substrate of claim 1, wherein each of the light emitting modules includes a light emitting unit and a driving chip, and wherein the driving chip includes a first pin and a second pin, the light emitting unit has an anode electrically connected to one of the second ends of the power supply line and a cathode electrically connected to the first pin of the driving chip, and the second pin of the driving chip is electrically connected to one of the second ends of the feedback line.

3. The light emitting substrate of claim 2, wherein the plurality of light emitting modules are divided into at least two groups of light emitting modules including a plurality of light emitting modules arranged in a first direction, the at least two groups of light emitting modules are arranged in a second direction, and the first direction intersects the second direction.

4. The light emitting substrate of claim 3, wherein each of a plurality of second ends of the feedback line respectively electrically connected to a plurality of light emitting modules in a same group of light emitting modules is electrically connected to one of first nodes of the group of light emitting modules, and the first end of the feedback line is electrically connected to at least two of the first nodes.

5. The light emitting substrate of claim 3 or 4, wherein each of a plurality of second ends of the power supply line respectively electrically connected to a plurality of light emitting modules in a same group of light emitting modules is electrically connected to one of second nodes of the group of light emitting modules, and the first end of the power supply line is electrically connected to at least two of the second nodes.

6. The light emitting substrate of claim 4, wherein the power supply module further comprises resistors provided between at least a portion of the plurality of groups of light emitting modules and the first end of the feedback line.

7. The light emitting substrate of claim 6, wherein the light emitting substrate further comprises a compensation region provided with the plurality of groups of light emitting modules; and each of the resistors is disposed between at least a portion of the plurality of groups of light emitting modules in the compensation region and the first end of the feedback line.

8. The light emitting substrate of claim 6, wherein each of the resistors is electrically connected between one of the first nodes and the first end of the feedback line.

9. The light emitting substrate of claim 6, wherein the power supply module further comprises a resistor provided between two adjacent groups of the plurality of groups of light emitting modules.

10. The light emitting substrate of claim 6, wherein a resistance value of each of the resistors is positively correlated with a length of the power supply line from a corresponding group of the groups of light emitting modules to the voltage output terminal.

11. The light emitting substrate of claim 4, wherein the plurality of driving chips in the same group of light emitting modules have the same level of current.

12. The light emitting substrate of claim 4, wherein each of current values on the plurality of second ends of the feedback line electrically connected to the plurality of light emitting modules in the same group of light emitting modules is equal.

13. The light emitting substrate of claim 1, wherein the power supply unit includes an Alternating Current (AC)-Direct Current (DC) converter, and wherein the AC-DC converter includes a voltage input terminal for receiving an AC voltage, a signal receiving terminal for receiving the feedback signal, and a voltage output terminal for controlling output of the power supply voltage based on the feedback signal.

14. A driving method, comprising: obtaining an initial power supply voltage provided by a power supply module and a driving voltage required to drive a light emitting module to emit light; calculating a voltage difference between the initial power supply voltage and the driving voltage; outputting a feedback signal based on the voltage difference; and adjusting the initial power supply voltage to a target power supply voltage based on the feedback signal.

15. The driving method of claim 14, wherein the outputting and the adjusting comprise: obtaining an initial level of current of the light emitting module; determining whether the voltage difference is greater than a preset threshold value; adjusting the initial level of current to a target level of current based on the determination; outputting a feedback signal based on a target driving current corresponding to the target level of current; and adjusting the initial power supply voltage to the target power supply voltage based on the feedback signal.

16. The driving method of claim 15, wherein the adjusting the initial level of current to the target level of current based on the determination comprises: in response to the voltage difference being greater than the preset threshold value, decreasing the initial level of current to the target level of current.

17. The driving method of claim 15, wherein the adjusting the initial level of current to the target level of current based on the determination comprises: in response to the voltage difference being less than the preset threshold value, increasing the initial level of current to the target level of current.

18. The driving method of claim 15, wherein the obtaining the initial level of current of the light emitting module comprises: setting a plurality of levels of current based on a display brightness range of the light emitting module to establish a correspondence between a light emitting brightness of the light emitting module and a driving current; obtaining a current range based on a maximum current corresponding to a maximum display brightness and a minimum current corresponding to a minimum display brightness; and obtaining the initial level of current of the light emitting module based on the current range.

19. The driving method of claim 15, wherein the initial level of current is a median value of the plurality of levels of current.

20. The driving method of claim 14, wherein the preset threshold value is in the range of 0.6 V to 1.5 V.

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