Light-emitting substrate and driving method

Abstract

The present application provides a light-emitting substrate and a driving method. The light-emitting substrate includes a power supply module and a plurality of light-emitting modules. 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. The power supply module is used to control the voltage output terminal based on the feedback signal received by the signal receiving terminal to output a power supply voltage. The light-emitting module is driven by the power supply voltage to emit light and is used to output a 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 particularly to a light-emitting substrate and a driving method.

Background Art

[0002] Micro light emitting diode display devices and mini light emitting diode display devices include thousands of light emitting diodes. In order to drive the light emitting diodes to emit light, a conventional light-emitting substrate is provided with an AC-DC power module and a DC-DC power module. The AC-DC power module is used to convert the AC voltage supplied from an external power source into a DC voltage. The DC-DC power module is used to convert the DC voltage supplied from the AC-DC power module into a driving voltage for driving the light emission of the light emitting diodes.

[0003] Since a conventional light-emitting substrate is provided with a plurality of DC-DC power modules to supply driving voltages to the light emitting diodes in corresponding regions, the circuit structure of the conventional light-emitting substrate is complex and the cost is too high.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The present application provides a light-emitting substrate and a driving method capable of simplifying the circuit structure and reducing the cost.

Means for Solving the Problems

[0005] An embodiment of the present application provides a light-emitting substrate, the light-emitting substrate includes a power supply module and a plurality of light-emitting modules, the power supply 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 reception terminal, the power line and the feedback line each have a first terminal and a second terminal, the first terminal of the power line is electrically connected to the voltage output terminal, the first terminal of the feedback line is electrically connected to the signal reception terminal, the power supply module is used to control the voltage output terminal based on the feedback signal received by the signal reception terminal to output a power supply voltage, the plurality of light-emitting modules are each electrically connected to the second terminal of the power line, the plurality of light-emitting modules are each electrically connected to the second terminal of the feedback line, the light-emitting module is driven by the power supply voltage to emit light, and is used to output 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 further provides a driving method, the driving method includes obtaining an initial power supply voltage value provided by a power supply module and a driving voltage value required for the light emission of a light-emitting module, 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.

Effect of the Invention

[0007] This application provides a light-emitting substrate and a driving method. The light-emitting substrate includes a power module and a plurality of 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 terminal and a second terminal. The first terminal of the power line is electrically connected to the voltage output terminal, and the first terminal of the feedback line is electrically connected to the signal receiving terminal. The power module is used to control the voltage output terminal based on the feedback signal received by the signal receiving terminal to output a power supply voltage. The plurality of light-emitting modules are electrically connected to the second terminal of the power line respectively, and the plurality of light-emitting modules are electrically connected to the second terminal of the feedback line respectively. The light-emitting module is driven by the power supply voltage to emit light and is used to output the feedback signal to the power supply unit based on the power supply voltage. The light-emitting substrate is provided with a plurality of second terminals on the power line and the feedback line in the power module respectively, and a plurality of light-emitting modules are electrically connected to the plurality of second terminals of the power line and the plurality of second terminals of the feedback line respectively. That is, by installing only one power module, it is realized to provide a power supply voltage to all the light-emitting modules, reduce the number of power modules used, simplify the circuit structure, greatly reduce the cost, and is beneficial to improving the competitiveness of the product.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0009] Hereinafter, the technical solutions in the embodiments of the present application will be described with reference to the drawings. The described technical solutions are only used to explain and illustrate the technical idea of the present application and should not be regarded as limiting the protection scope of the present application.

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

[0011] In the light-emitting substrate provided by the present application, a plurality of second terminals are provided on the power line 12 and the feedback line 13 in the power module 10, and the plurality of light-emitting modules 20 are each electrically connected to the plurality of second terminals 122 of the power line 12 and the plurality of second terminals of the feedback line 13. That is, by installing only one power module 10, it is realized to provide a power supply voltage to all the light-emitting modules 20, reduce the number of power modules 10 used, realize the simplification of the circuit structure and the significant reduction of the cost, which is advantageous for improving the competitiveness of the product. In an embodiment of the present application, the light-emitting substrate 100 further includes a substrate, and at least a part of the light-emitting module 20 and the power module 10 is disposed on the substrate. 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 navigation device, etc.

[0012] In the embodiment of the present application, the power supply unit 11 includes an AC-DC converter. The AC-DC converter 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. 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 supplied from an external power source, for example, a 220V AC voltage at home, converts the AC voltage into a DC voltage, and drives the light-emitting module 20 to emit light. The power supply unit 11 dynamically adjusts the magnitude of the power supply voltage based on the feedback signal. For example, when the power supply voltage value does not match the driving voltage value required for the light emission of the light-emitting module 20, 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 value based on this feedback signal to ensure that the light-emitting module 20 emits light normally. On the other hand, when the voltage difference between the power supply voltage value and the driving voltage required for the light emission of the light-emitting module 20 is greater than a predetermined threshold value, the power supply voltage value can be lowered based on the feedback signal to prevent the driving chip from generating heat and reduce power consumption.

[0013] 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 anode A of the light-emitting unit 21 is electrically connected to the second terminal 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 driving chip 22. The second pin 222 of the driving chip 22 is electrically connected to the second terminal 132 of the feedback line 13. Specifically, the light-emitting unit 21 may be a single light-emitting diode, or may be a light-emitting diode string in which a plurality of light-emitting diodes are sequentially connected in series. Each driving chip 22 is electrically connected to at least one light-emitting diode or at least one light-emitting diode string, and the driving chip 22 drives the corresponding light-emitting unit to emit light.

[0014] In the embodiment of the present application, in the driving chip 22, a plurality of levels of currents are preset based on the display luminance range, and the correspondence relationship between the emission luminance of the light-emitting unit 21 and the driving current is established. Here, the emission luminance is positively correlated with the driving current, that is, the larger the emission luminance, the larger the driving current, and the smaller the emission luminance, the smaller the driving current. By determining the maximum current value corresponding to the maximum display luminance and the minimum current value corresponding to the minimum display luminance, the current range can be determined. For example, for the maximum display luminance of 1600 candela / m 2 the corresponding maximum current value is 7 mA, and for the minimum display luminance of 600 candela / m 2 if the corresponding minimum current value is 1 mA, the current range is from 1 mA to 7 mA.

[0015] Furthermore, a plurality of current values within the current range are set as the level currents. The level current includes at least two current values, that is, the maximum current value and the minimum current value of the current range are each one level current. Moreover, one current value can also be selected as the level current at regular intervals between the maximum current value and the minimum current value. For example, the plurality of current values within the current range include four level currents of 1 mA, 3 mA, 5 mA, and 7 mA respectively. Furthermore, the plurality of level currents have a correspondence relationship with the gray scale. Here, the larger the level current, the larger the gray scale value, and the smaller the level current, the smaller the gray scale value. The level current includes a plurality of current values, and the driving chip adjusts the initial level current to the corresponding target level current based on the power supply voltage value.

[0016] In the embodiment of the present application, the median value of a plurality of levels of current is used as the current of the initial level. When the voltage difference between the power supply voltage provided by the power supply module 10 and the driving voltage required for the light emission of the light emitting unit 21 is greater than a predetermined threshold value, the current of the level of the driving chip is adjusted in the reverse direction, that is, a level of current smaller than the current of the initial level is selected as the current of the target level. Accordingly, when the voltage difference between the power supply voltage provided by the power supply module 10 and the driving voltage required for the light emission of the light emitting unit 21 is smaller than a predetermined threshold value, the current of the level of the driving chip is adjusted in the forward direction, that is, a level of current greater than the current of the initial level is selected as the current of the target level. The light emitting substrate adjusts the magnitude of the power supply voltage based on the current value of the current of the level of the light emitting cell 21 and the second terminal 132 of the feedback line 13 electrically connected to the corresponding driving chip 22.

[0017] Specifically, the change value of the power supply voltage is calculated by Equation 1.

[0018]

Equation

[0019] Here, ΔVLED is the change value of the power supply voltage, N i is the current level corresponding to the i-th driving chip 22, and I FBi is the current value at the second terminal 132 of the feedback line 13 electrically connected to the i-th driving chip 22.

[0020] In the embodiment of the present application, a plurality of light emitting modules 20 are divided into at least two light emitting module groups 201, and the light emitting module group 201 includes a plurality of light emitting modules 20 arranged along the first direction X. At least two light emitting module groups 201 are arranged along a second direction Y intersecting the first direction X. Preferably, the first direction X is orthogonal 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.

[0021] In the embodiment of the present application, a plurality of second terminals 132 of the feedback lines 13 respectively and electrically connected to a plurality of 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 terminal 131 of the feedback line 13 is electrically connected to at least two first nodes P. Preferably, the current levels of the plurality of drive chips 22 in the same light-emitting module group 201 are the same. When the current values at the plurality of second terminals 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 equal, N in Equation 1 i is the current level corresponding to the i-th row drive chip 22, and I FBi is the current value at the second terminal 132 of the feedback line 13 electrically connected to the drive chip 22 in the i-th row.

[0022] In the embodiment of the present application, the light-emitting substrate adjusts the power supply voltage value based on the change value of the power supply voltage obtained by Equation 1. Specifically, the feedback signal provided by the drive chip 22 is the power supply voltage. When the voltage difference between the power supply voltage and the drive voltage required for the light emission of the light-emitting unit 21 is greater than a predetermined threshold, the light-emitting substrate obtains the target power supply voltage by lowering the power supply voltage based on the change value of the power supply voltage. Accordingly, when the feedback signal provided by the drive chip 22 is the power supply voltage and the voltage difference between the power supply voltage and the drive voltage required for the light emission of the light-emitting unit 21 is less than a predetermined threshold, the light-emitting substrate obtains the target power supply voltage by increasing the power supply voltage based on the change value of the power supply voltage.

[0023] In the embodiment of the present application, the range of the predetermined threshold is from 0.6V to 1.5V. Specifically, the predetermined threshold includes 0.6V, 0.7V, 0.8V, 0.9V, 1.0V, 1.1V, 1.2V, 1.3V, 1.4V, and 1.5V. Preferably, the predetermined threshold is 0.6V. That is, when the voltage difference between the power supply voltage provided by the power supply module 10 and the driving voltage required for the light emission of the light emitting unit 21 is greater than 0.6V, a current level smaller than the initial level current is selected as the target level current. Accordingly, when the voltage difference between the power supply voltage provided by the power supply module 10 and the driving voltage required for the light emission of the light emitting unit 21 is smaller than 0.6V, a current level greater than the initial level current is selected as the target level current.

[0024] In the embodiment of the present application, a plurality of second terminals 122 of the power supply line 12 are electrically connected to a plurality of light emitting modules 20 respectively. Specifically, a plurality of second terminals 122 of the power supply line 12 electrically connected to a plurality of 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 one first light emitting module group 201a and a plurality of second light emitting module groups 201b. The first light emitting module group 201a is further electrically connected to the first terminal 121 of the power supply line 12, and the first light emitting module group 201a is electrically connected to the plurality of second light emitting module groups 201b via the second node N.

[0025] As shown in FIG. 3, the embodiment of the present application provides a light emitting substrate 200, and the light emitting substrate 200 is different from the light emitting substrate 100 in the following aspects. In the light emitting substrate 200, a plurality of second terminals 122 of the power supply line 12 electrically connected to a plurality of 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 terminal 121 of the power supply line 12 is electrically connected to at least two second nodes N.

[0026] Specifically, the light-emitting substrate 200 includes a power supply module 10 and a plurality of light-emitting modules 20. The power supply 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 reception terminal 112. Both the power line 12 and the feedback line 13 have a first terminal and a plurality of second terminals. The first terminal 121 of the power line 12 is electrically connected to the voltage output terminal 111, and the first terminal 131 of the feedback line 13 is electrically connected to the signal reception terminal 112. The power supply module 10 is used to control the voltage output terminal 111 based on the feedback signal received by the signal reception terminal 112 to output a power supply voltage. 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 anode A of the light-emitting unit 21 is electrically connected to the second terminal 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 driving chip 22. The second pin 222 of the driving chip 22 is electrically connected to the second terminal 132 of the feedback line 13. The driving chip 22 drives the corresponding light-emitting unit 21 to emit light and outputs a feedback signal to the power supply unit 11 based on the power supply voltage.

[0027] Specifically, the plurality of light-emitting modules 20 includes at least two light-emitting module groups 201. The light-emitting module 20 includes a plurality of light-emitting modules 20 arranged along the first direction X. The at least two light-emitting module groups 201 are arranged along the second direction Y, and the first direction X is orthogonal to the second direction Y. Here, the plurality of second terminals 132 of the feedback lines 13 respectively and electrically connected to the plurality of 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 terminal 131 of the feedback line 13 is electrically connected to at least two first nodes P.

[0028] As shown in FIG. 4, the embodiment of the present application provides a light-emitting substrate 300, and the light-emitting substrate 300 is different from the light-emitting substrate 100 in the following aspects. In the light-emitting substrate 300, the power module 10 further includes a resistor 30, and the resistor 30 is electrically connected to each first node P and the first terminal 131 of the feedback line 13, respectively.

[0029] Specifically, the light-emitting substrate 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 reception terminal 112. Both the power line 12 and the feedback line 13 have a first terminal and a plurality of second terminals. The first terminal 121 of the power line 12 is electrically connected to the voltage output terminal 111, and the first terminal 131 of the feedback line 13 is electrically connected to the signal reception terminal 112. The power module 10 is used to control the voltage output terminal 111 based on the feedback signal received by the signal reception terminal 112 to output a power supply voltage. 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 anode A of the light-emitting unit 21 is electrically connected to the second terminal 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 driving chip 22. The second pin 222 of the driving chip 22 is electrically connected to the second terminal 132 of the feedback line 13. The driving chip 22 drives the corresponding light-emitting unit 21 to emit light, and outputs 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 emission of the light-emitting unit 21.

[0030] Specifically, the plurality of light emitting modules 20 includes at least two light emitting module groups 201, and the light emitting module 20 includes a plurality of light emitting modules 20 arranged along the first direction X. The at least two light emitting module groups 201 are arranged along the second direction Y, and the first direction X is orthogonal to the second direction Y. Here, the plurality of second terminals 132 of the plurality of 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 the first node P of the light emitting module group 201, and the first terminal 131 of the feedback line 13 is electrically connected to at least two first nodes P.

[0031] In the embodiment of the present application, the plurality of second terminals 122 of the power supply line 12 are electrically connected to the plurality of light emitting modules 20 respectively. Specifically, the plurality of second terminals 122 of the power supply line 12 electrically connected to the plurality of 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 one first light emitting module group 201a and a plurality of second light emitting module groups 201b. The first light emitting module group 201a is further electrically connected to the first terminal 121 of the power supply line 12, and the first light emitting module group 201a is electrically connected to the plurality of second light emitting module groups 201b via the second node N.

[0032] In the embodiments of the present application, the resistance value 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, the distances from different light-emitting modules 20 to the voltage output terminal 111 in the power supply module 10 are different, and voltage drops occur during the transmission of the power supply voltage due to the influence of the resistor 30 in the power line 12. Therefore, the received power supply voltage of the light-emitting module 20 far from the voltage output terminal 111 is smaller than the received power supply voltage of the light-emitting module 20 close to the voltage output terminal 111. Accordingly, in the embodiments of the present application, by installing resistors 30 having different resistance values on the feedback line 13, the control weights for the change values of the power supply voltage of the resistors 30 electrically connected to different light-emitting module groups 201 are different. Here, the control weight for the change value of the power supply voltage of the resistor 30 electrically connected to the light-emitting module group 201 far from the voltage output terminal 111 is higher than the control weight for the change value of the power supply voltage of the resistor 30 electrically connected to the light-emitting module group 201 close to the voltage output terminal 111. This is advantageous for shortening the time required for dynamic voltage adjustment. At the same time, it can ensure that the light-emitting module 20 far from the voltage output terminal 111 reaches the target drive voltage value, and the luminance uniformity can be improved.

[0033] In the embodiments of the present application, the change value of the power supply voltage is calculated by Equation 2.

[0034] [Number]

[0035] Here, ΔVLED is the change value of the power supply voltage, and R i is the resistance value of the resistor 30 electrically connected to the i-th light-emitting module group 201, Ni is the current level corresponding to the i-th drive chip 22, and I FBi is the current value at the second terminal 132 of the feedback line 13 electrically connected to the i-th drive chip 22.

[0036] In the embodiments of the present application, R iThe resistance value is greater than that of R1. This installation is beneficial for shortening the time required for dynamic voltage adjustment. At the same time, it ensures that the light-emitting module 20 far from the voltage output terminal 111 quickly reaches the target drive voltage value, and the luminance uniformity can be improved.

[0037] As shown in FIG. 5, the embodiment of the present application provides a light-emitting substrate 400, which is different from the light-emitting substrate 100 in the following aspects. The light-emitting substrate 400 further includes a compensation region 101, and a plurality of light-emitting module groups 201 and resistors 30 are provided in the compensation region 101. A resistor 30 is provided between at least a part of the plurality of light-emitting module groups 201 located in the compensation region 101 and the first terminal 131 of the feedback line 13. Here, the resistance value of the resistor 30 is positively correlated with the length of the power supply line 12 from the corresponding light-emitting module group 201 to the voltage output terminal 121.

[0038] Specifically, the number of compensation regions 101 may be 2, 3, 4, ··· n (n is a positive integer). The number of light-emitting module groups 201 in each compensation region 101 may be 2, 3, 4, ··· n (n is a positive integer). The number of resistors 30 provided in each compensation region 101 may be 1, 2, 3, 4, ··· n (n is a positive integer), and the number of resistors 30 in each compensation region 101 may be the same or different. In FIG. 5, only one compensation region 101 is provided. One compensation region 101 includes three light-emitting module groups 201, and a resistor 30 is provided between two of the light-emitting module groups 201 and the power supply module 10.

[0039] Specifically, the light-emitting substrate 400 includes a power supply module 10 and a plurality of light-emitting modules 20. The power supply 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 reception terminal 112. Both the power line 12 and the feedback line 13 have a first terminal and a plurality of second terminals. The first terminal 121 of the power line 12 is electrically connected to the voltage output terminal 111, and the first terminal 131 of the feedback line 13 is electrically connected to the signal reception terminal 112. The power supply module 10 is used to control the voltage output terminal 111 based on the feedback signal received by the signal reception terminal 112 to output a power supply voltage. 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 anode A of the light-emitting unit 21 is electrically connected to the second terminal 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 driving chip 22. The second pin 222 of the driving chip 22 is electrically connected to the second terminal 132 of the feedback line 13. The driving chip 22 drives the corresponding light-emitting unit 21 to emit light and outputs a feedback signal to the power supply unit 11 based on the power supply voltage.

[0040] Specifically, the plurality of light-emitting modules 20 includes at least two light-emitting module groups 201. The light-emitting module 20 includes a plurality of light-emitting modules 20 arranged along the first direction X. The at least two light-emitting module groups 201 are arranged along the second direction Y, and the first direction X is orthogonal to the second direction Y. Here, the plurality of second terminals 132 of the feedback lines 13 respectively and electrically connected to the plurality of 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 terminal 131 of the feedback line 13 is electrically connected to at least two first nodes P.

[0041] In the embodiment of the present application, a plurality of second terminals 122 of the power supply line 12 are electrically connected to a plurality of light emitting modules 20 respectively. Specifically, a plurality of second terminals 122 of the power supply line 12, which are electrically connected to a plurality of light emitting modules 20 in the same light emitting module group 201 respectively, are electrically connected to the second node N of the light emitting module group 201. The light emitting module group 201 includes one first light emitting module group 201a and a plurality of second light emitting module groups 201b. The first light emitting module group 201a is further electrically connected to the first terminal 121 of the power supply line 12, and the first light emitting module group 201a is electrically connected to a plurality of second light emitting module groups 201b through the second node N.

[0042] As shown in FIG. 6, the embodiment of the present application provides a light emitting substrate 500, and the light emitting substrate 500 is different from the light emitting substrate 100 in the following aspects. In the light emitting substrate 500, the power supply module 10 further includes a resistor 30, and the resistor 30 is provided between two adjacent light emitting module groups 201. Here, the resistance value of the resistor 30 is positively correlated with the length of the power supply line 12 from the corresponding light emitting module group 201 to the voltage output terminal 121.

[0043] Specifically, the light-emitting substrate 500 includes a power supply module 10 and a plurality of light-emitting modules 20. The power supply 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 reception terminal 112. Both the power line 12 and the feedback line 13 have a first terminal and a plurality of second terminals. The first terminal 121 of the power line 12 is electrically connected to the voltage output terminal 111, and the first terminal 131 of the feedback line 13 is electrically connected to the signal reception terminal 112. The power supply module 10 is used to control the voltage output terminal 111 based on the feedback signal received by the signal reception terminal 112 to output a power supply voltage. 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 anode A of the light-emitting unit 21 is electrically connected to the second terminal 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 driving chip 22. The second pin 222 of the driving chip 22 is electrically connected to the second terminal 132 of the feedback line 13. The driving chip 22 drives the corresponding light-emitting unit 21 to emit light and outputs a feedback signal to the power supply unit 11 based on the power supply voltage.

[0044] Specifically, the plurality of light-emitting modules 20 includes at least two light-emitting module groups 201. The light-emitting module 20 includes a plurality of light-emitting modules 20 arranged along the first direction X. The at least two light-emitting module groups 201 are arranged along the second direction Y, and the first direction X is orthogonal to the second direction Y. Here, the plurality of second terminals 132 of the feedback line 13, which are respectively electrically connected to the plurality of 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 terminal 131 of the feedback line 13 is electrically connected to at least two first nodes P.

[0045] In the embodiment of the present application, a plurality of second terminals 122 of the power line 12 are electrically connected to a plurality of light-emitting modules 20 respectively. Specifically, a plurality of second terminals 122 of the power line 12 that are electrically connected to a plurality of 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 one first light-emitting module group 201a and a plurality of second light-emitting module groups 201b. The first light-emitting module group 201a is further electrically connected to the first terminal 121 of the power line 12, and the first light-emitting module group 201a is electrically connected to the plurality of second light-emitting module groups 201b through the second node N.

[0046] As shown in FIG. 7, the present application provides a driving method applied to the above-mentioned light-emitting substrate. The driving method includes the following.

[0047] S10. Obtain the initial power supply voltage value provided by the power supply module and the driving voltage value required for the light emission of the light-emitting module.

[0048] Specifically, the light-emitting module includes a light-emitting unit and a driving chip. In step S10, obtaining the driving voltage value required for the light emission of the light-emitting module refers to obtaining the driving voltage value required for the light emission of the light-emitting unit.

[0049] S20. Calculate the voltage difference between the initial power supply voltage value and the driving voltage value.

[0050] Specifically, the anode of the light-emitting unit is electrically connected to the power supply module, the cathode of the light-emitting unit is electrically connected to the driving chip, and the voltage difference between the initial power supply voltage value and the driving voltage value is the voltage value input to the driving chip.

[0051] S30. Output a feedback signal based on the voltage difference.

[0052] S40. Adjust the initial power supply voltage value to the target power supply voltage value based on the feedback signal.

[0053] Specifically, the drive chip generates a corresponding feedback signal based on the detected voltage difference, outputs the feedback signal to the power module. Here, the smaller the intensity of the feedback signal, the larger the initial power supply voltage output by the power module. Conversely, the larger the intensity of the feedback signal, the smaller the initial power supply voltage output by the power module.

[0054] As shown in FIG. 8, step S30 includes the following.

[0055] S301, obtain the current at the initial level of the light-emitting module.

[0056] S302, determine whether the voltage difference is greater than a predetermined threshold.

[0057] S303, adjust the current at the initial level to the current at the target level based on the determination result.

[0058] Specifically, when the voltage difference is greater than a predetermined threshold, lower the current at the initial level to the current at the target level. When the voltage difference is less than a predetermined threshold, increase the current at the initial level to the current at the target level.

[0059] In S304, a feedback signal is output based on the target drive current value corresponding to the current at the target level.

[0060] S305, adjust the initial power supply voltage value to the target power supply voltage value based on the feedback signal.

[0061] In the embodiment of the present application, the range of the predetermined threshold is 0.6V to 1.5V. When the voltage difference between the power supply voltage and the drive voltage required for the light emission of the light-emitting unit 21 is in the range of 0.6V to 1.5V, it is advantageous to extend the service life of the drive chip and improve the display effect of the light-emitting substrate.

[0062] As described above, the light-emitting substrate and the driving method provided by the embodiments of the present application have been described in detail. However, the description of the above embodiments is for helping to understand the core idea of the present application, and the above description should not be construed as a limitation to the protection scope of the present application.

Description of Reference Numerals

[0063] 10 Power supply module 11 Power supply unit 12 Power supply line 13 Feedback line 20 Light-emitting module 21 Light-emitting unit 22 Driving chip 100 Light-emitting substrate 111 Voltage output terminal 112 Signal receiving terminal 201a First light-emitting module group 201b Second light-emitting module group

Claims

1. A power supply module including a power supply unit, a power line, and a feedback line, the power supply unit including a voltage output terminal and a signal reception terminal, the power line and the feedback line each having a first terminal and a second terminal, the first terminal of the power line being electrically connected to the voltage output terminal, the first terminal of the feedback line being electrically connected to the signal reception terminal, and the power supply module controlling the voltage output terminal based on a feedback signal received by the signal reception terminal to output a power supply voltage; A plurality of light emitting modules each electrically connected to the second terminal of the power line and each electrically connected to the second terminal of the feedback line, the plurality of light emitting modules being driven by the power supply voltage to emit light and outputting the feedback signal to the power supply unit based on the power supply voltage; A light emitting substrate.

2. The light emitting module includes a light emitting unit and a driving chip, the driving chip includes a first pin and a second pin, an anode of the light emitting unit is electrically connected to the second terminal of the power line, a 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 terminal of the feedback line. The light emitting substrate according to Claim 1.

3. The plurality of light emitting modules are divided into at least two light emitting module groups, the light emitting module groups each include a plurality of the light emitting modules arranged along a first direction X, and at least two light emitting module groups are arranged along a second direction Y intersecting the first direction X. The light emitting substrate according to Claim 2.

4. A plurality of second terminals of the feedback line each electrically connected to a plurality of the 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 terminal of the feedback line is electrically connected to at least two of the first nodes. The light emitting substrate according to Claim 3.

5. A plurality of second terminals of the power line each 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 the first terminal of the power line is electrically connected to at least two of the second nodes. The light emitting substrate according to Claim 3 or 4.

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

7. The light emitting substrate further includes a compensation region, and a plurality of the light emitting module groups are provided in the compensation region. The resistor is provided between at least a part of the plurality of light emitting module groups located in the compensation region and the first terminal of the feedback line. The light emitting substrate according to claim 6.

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

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

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

11. The current levels of the plurality of drive chips in the same light emitting module group are the same. The light emitting substrate according to claim 4.

12. The current values at the plurality of second terminals of the feedback line electrically connected to the plurality of light emitting modules in the same light emitting module group are equal. The light emitting substrate according to claim 4.

13. The power supply unit includes an AC-DC converter, the AC-DC converter 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. The light emitting substrate according to claim 1.

14. Obtaining an initial power supply voltage value provided by a power supply module and a drive voltage value required for light emission of a light emitting module. Calculating a voltage difference between the initial power supply voltage value and the drive voltage value. Outputting a feedback signal based on the voltage difference. Adjusting the initial power supply voltage value to a target power supply voltage value based on the feedback signal. Drive method.

15. 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; Obtaining an initial level of current of the light emitting module; determining whether the voltage difference is greater than a predetermined threshold; adjusting the initial level of current to a target level of current based on the determination result; outputting a feedback signal based on a target drive current value corresponding to the target level of current; adjusting the initial power supply voltage value to a target power supply voltage value based on the feedback signal. The driving method according to claim 14.

16. The step of adjusting the initial level of current to a target level of current based on the determination result includes: If the voltage difference is greater than the predetermined threshold, reducing the initial level of current to a target level of current. The driving method according to claim 15.

17. The step of adjusting the initial level of current to a target level of current based on the determination result includes: If the voltage difference is less than the predetermined threshold, increasing the initial level of current to a target level of current. The driving method according to claim 15.

18. The step of obtaining an initial level of current of the light emitting module includes: setting a plurality of levels of current based on a display brightness range of the light emitting module, and establishing a correspondence relationship between the light emitting brightness of the light emitting module and the driving current; Obtaining a current range based on a maximum current value corresponding to a maximum display brightness and a minimum current value corresponding to a minimum display brightness; and obtaining an initial level of current of the light emitting module based on the current range. The driving method according to claim 15.

19. the current at the initial level is a median value of the currents at the plurality of said levels; The driving method according to claim 15.

20. The predetermined threshold range is between 0.6V and 1.5V. The driving method according to claim 14.

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