CN116546692A - Light-emitting substrate and driving method - Google Patents
Light-emitting substrate and driving method Download PDFInfo
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- CN116546692A CN116546692A CN202310708517.5A CN202310708517A CN116546692A CN 116546692 A CN116546692 A CN 116546692A CN 202310708517 A CN202310708517 A CN 202310708517A CN 116546692 A CN116546692 A CN 116546692A
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- 239000000758 substrate Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000000875 corresponding effect Effects 0.000 claims description 25
- 230000002596 correlated effect Effects 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
Abstract
The application discloses a luminescent substrate and driving method, this luminescent substrate includes: the power supply unit comprises a voltage output end and a signal receiving end, the power supply line and the feedback line are respectively provided with a first end and a plurality of second ends, the first end of the power supply line is electrically connected with the voltage output end, the first end of the feedback line is electrically connected with the signal receiving end, and the power supply module is used for controlling the voltage output end to output power supply voltage based on feedback signals received by the signal receiving end; the plurality of light emitting modules are respectively and electrically connected with the second end of the power line, and the plurality of light emitting modules are respectively and electrically connected with the second end of the feedback line, and are used for emitting light under the drive of power supply voltage and outputting feedback signals to the power supply unit based on the power supply voltage. The driving circuit realizes simplified circuit structure and greatly reduces cost.
Description
Technical Field
The application relates to the technical field of display, in particular to a light-emitting substrate and a driving method.
Background
The micro light emitting diode display device and the sub-millimeter light emitting diode display device comprise thousands of light emitting diodes. In order to drive the light emitting diode to emit light, an ac-dc power module and a dc-dc power module are disposed in the existing light emitting substrate, where the ac-dc power module is configured to convert an ac voltage provided by an external power source into a dc voltage, and the dc-dc power module is configured to convert the dc voltage provided by the ac-dc power module into a driving voltage for driving the light emitting diode to emit light.
In the existing light-emitting substrate, a plurality of direct current-direct current power supply modules are arranged to respectively provide driving voltages for the light-emitting diodes in the corresponding areas, so that the circuit structure of the existing light-emitting substrate is complex and the cost is high.
Disclosure of Invention
The present invention provides a light emitting substrate and a driving method, which can simplify a circuit structure and reduce cost.
In one aspect, embodiments of the present application provide a light emitting substrate, including: the power supply module comprises a power supply unit, a power line and a feedback line, wherein the power supply unit comprises a voltage output end and a signal receiving end, the power line and the feedback line are respectively provided with a first end and a plurality of second ends, the first end of the power line is electrically connected with the voltage output end, the first end of the feedback line is electrically connected with the signal receiving end, and the power supply module is used for controlling the voltage output end to output power voltage based on a feedback signal received by the signal receiving end; the light emitting modules are respectively and electrically connected with the second ends of the power lines, and are respectively and electrically connected with the second ends of the feedback lines, and are used for emitting light under the drive of the power supply voltage and outputting the feedback signals to the power supply unit based on the power supply voltage.
Optionally, in some embodiments of the present application, 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 with the second end of the power line, a cathode of the light emitting unit is electrically connected with the first pin of the driving chip, and the second pin of the driving chip is electrically connected with the second end of the feedback line.
Optionally, in some embodiments of the present application, the plurality of light emitting modules is divided into at least two light emitting module groups, the light emitting module groups include a plurality of light emitting modules arranged along a first direction, the at least two light emitting module groups are arranged along a second direction, and the first direction intersects the second direction.
Optionally, in some embodiments of the present application, a plurality of second ends of the feedback lines 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 ends of the feedback lines are electrically connected to at least two first nodes.
Optionally, in some embodiments of the present application, a plurality of second ends of the power line electrically connected to a plurality of the light emitting modules in the same light emitting module group are electrically connected to a second node of the light emitting module group, and a first end of the power line is electrically connected to at least two of the second nodes.
Optionally, in some embodiments of the present application, the light emitting substrate further includes a compensation region, and the power module further includes a resistor disposed between at least some of the plurality of light emitting module groups and the first end of the feedback line.
Optionally, in some embodiments of the present application, a resistance value of the resistor is positively correlated with a length of the power line from the corresponding light emitting module group to the voltage output terminal.
Optionally, in some embodiments of the present application, the power supply unit includes an ac-dc converter, and the ac-dc converter includes a voltage input terminal, the voltage output terminal, and the signal receiving terminal, where the voltage input terminal is configured to receive an ac voltage, the signal receiving terminal is configured to receive the feedback signal, and the voltage output terminal is configured to control output of the power supply voltage based on the feedback signal.
The application also provides a driving method, comprising the following steps: acquiring an initial power supply voltage value provided by a power supply module and a driving voltage value required by 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 according to the voltage difference; and adjusting the initial power supply voltage value to a target power supply voltage value according to the feedback signal.
Optionally, in some embodiments of the present application, the step of outputting a feedback signal according to the voltage difference value, and adjusting the initial power supply voltage value to a target power supply voltage value according to the feedback signal includes: acquiring an initial gear current of the light emitting module; judging whether the voltage difference is larger than a preset threshold value or not; adjusting the initial gear current to a target gear current according to a judging result; and outputting a feedback signal according to a target driving current value corresponding to the target gear current, and adjusting the initial power supply voltage value to a target power supply voltage value according to the feedback signal.
The application provides a light-emitting substrate and a driving method, wherein the light-emitting substrate comprises: the power supply module comprises a power supply unit, a power line and a feedback line, wherein the power supply unit comprises a voltage output end and a signal receiving end, the power line and the feedback line are respectively provided with a first end and a plurality of second ends, the first end of the power line is electrically connected with the voltage output end, the first end of the feedback line is electrically connected with the signal receiving end, and the power supply module is used for controlling the voltage output end to output power voltage based on a feedback signal received by the signal receiving end; the light emitting modules are respectively and electrically connected with the second ends of the power lines, and are respectively and electrically connected with the second ends of the feedback lines, and are used for emitting light under the drive of the power supply voltage and outputting the feedback signals to the power supply unit based on the power supply voltage. The power line and the feedback line in the power module are respectively provided with the second ends, and the plurality of light-emitting modules are respectively electrically connected with the second ends of the power line and the second ends of the feedback line, namely, the power supply voltage is provided for all the light-emitting modules by arranging one power module, so that the use quantity of the power modules is reduced, the simplification of the circuit structure and the great reduction of the cost are realized, and the product competitiveness is improved.
Drawings
Fig. 1 is a block diagram of a light-emitting substrate provided by an embodiment of the present application;
FIG. 2 is a first schematic view of a light-emitting substrate according to an embodiment of the present application;
FIG. 3 is a second schematic view of a light-emitting substrate according to an embodiment of the present disclosure;
fig. 4 is a third schematic view of a light-emitting substrate provided in an embodiment of the present application;
FIG. 5 is a fourth schematic view of a light-emitting substrate provided in an embodiment of the present application;
FIG. 6 is a fifth schematic diagram of a light-emitting substrate provided in an embodiment of the present application;
FIG. 7 is a flow chart of a driving method provided by an embodiment of the present application;
fig. 8 is a flowchart of step S30 in fig. 7.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. The described technical solutions are only used for explaining and explaining the idea of the present application and should not be construed as limiting the scope of protection of the present application.
As shown in fig. 1, an embodiment of the present application provides a light emitting substrate 100 including: the power module 10 includes a power supply unit 11, a power line 12, and a feedback line 13, and a plurality of light emitting modules 20. The power supply unit 11 includes a voltage output terminal 111 and a signal receiving terminal 112. The power line 12 and the feedback line 13 each have a first end and a plurality of second ends, the first end 121 of the power 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 module 10 is configured to control the voltage output terminal 111 to output a power supply voltage based on the feedback signal received by the signal receiving terminal 112. The light emitting modules 20 are electrically connected to the second ends 122 of the power lines 12, respectively, and the light emitting modules 20 are electrically connected to the second ends 132 of the feedback lines 13, respectively. The light emitting module 20 is configured to emit light under the driving of a power supply voltage, and output a feedback signal to the power supply unit 11 based on the power supply voltage.
In the light-emitting substrate provided by the application, since the power line 12 and the feedback line 13 in the power module 10 are respectively provided with a plurality of second ends, the plurality of light-emitting modules 20 are respectively electrically connected with a plurality of second ends 122 of the power line 12 and a plurality of second ends of the feedback line 13, namely, the power supply voltage is provided for all the light-emitting modules 20 by arranging one power module 10, the number of the power modules 10 is reduced, the simplification of the circuit structure and the great reduction of the cost are realized, and the competitiveness of products is improved.
In the embodiment of the present application, the light emitting substrate 100 further includes a substrate, and at least portions of the light emitting module 20 and the power module 10 are disposed on the substrate. Specifically, the light-emitting substrate can be applied to any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
In the embodiment of the present application, the power supply unit 11 includes an ac-dc converter, and the ac-dc converter includes a voltage input terminal, a voltage output terminal, and a signal receiving terminal, where the voltage input terminal is configured to receive an ac voltage, the signal receiving terminal is configured to receive a feedback signal, and the voltage output terminal is configured to control output of a power supply voltage based on the feedback signal. Specifically, the power supply unit 11 is connected to an ac voltage supplied from an external power source, for example, 220 v ac voltage for home use, 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 power supply voltage according to the feedback signal, for example, when the power supply voltage value does not match with the driving voltage value required by 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 value according to the feedback signal to ensure that the light emitting module 20 emits light normally. Meanwhile, when the voltage difference between the power voltage value and the driving voltage value required by the light emitting module 20 to emit light is greater than the preset threshold, the power voltage value is reduced according to the feedback signal, so that the driving chip is prevented from heating and the power consumption is reduced.
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, an anode a of the light emitting unit 21 is electrically connected to the second end 122 of the power line 12, a cathode C of the light emitting unit 21 is electrically connected to the first pin 221 of the driving chip 22, and the second pin 222 of the driving chip 22 is electrically connected to the second end 132 of the feedback line 13. Specifically, the light emitting unit 21 may be one light emitting diode, or a light emitting diode string formed by sequentially connecting a plurality of light emitting diodes 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 is used for driving the corresponding light emitting unit to emit light.
In the embodiment of the present application, a plurality of shift currents are preset in the driving chip 22 according to the display luminance range, and the correspondence relationship between the light emission luminance of the light emitting unit 21 and the driving current is established. Wherein, the light-emitting brightness is positively correlated with the driving current, namely, the larger the light-emitting brightness is, the larger the driving current is; the smaller the light emission luminance, the smaller the drive current. The current range can be determined by determining the maximum current value corresponding to the maximum display luminance and the minimum current value corresponding to the minimum display luminance. For example, a maximum display luminance of 1600 candelas per square meter corresponds to a maximum current value of 7 milliamps, and a minimum display luminance of 600 candelas per square meter corresponds to a minimum current value of 1 milliamp, then the current range is 1 milliamp to 7 milliamps.
Further, a plurality of current values in the current range are set as the shift current. The gear current comprises at least two, i.e. the maximum current value and the minimum current value of the current range are each one gear current. On the basis, a current value can be selected as a gear current at fixed values every interval between the maximum current value and the minimum current value. For example, the plurality of current values in the current range includes four gear currents of 1 milliamp, 3 milliamp, 5 milliamp, and 7 milliamp, respectively. Further, the plurality of shift currents have a correspondence with the gray scale. The larger the gear current is, the larger the gray scale value is; the smaller the gear current, the smaller the gray scale value. The gear current comprises a plurality of gear currents, and the driving chip can adjust the initial gear current to the corresponding target gear current according to the power supply voltage value.
In the embodiment of the present application, the median value among the plurality of gear currents is taken as the initial gear current, and when the voltage difference between the power supply voltage supplied by the power supply module 10 and the driving voltage required for light emission of the light emitting unit 21 is greater than the preset threshold value, the gear current of the driving chip is negatively adjusted, that is, the gear current smaller than the initial gear current is selected as the target gear current. Correspondingly, when the voltage difference between the power supply voltage supplied by the power supply module 10 and the driving voltage required for the light emission of the light emitting unit 21 is smaller than the preset threshold value, the shift current of the driving chip is adjusted in the forward direction, that is, a shift current larger than the initial shift current is selected as the target shift current. The light-emitting substrate adjusts the power supply voltage according to the gear current of the light-emitting unit 21 and the current value at the second end 132 of the feedback line 13 electrically connected to the corresponding driving chip 22.
Specifically, the change value of the power supply voltage is calculated according to formula one:
(equation I)
Wherein DeltaVLED refers to the variation of the supply voltage, N i Refers to the current gear corresponding to the ith driving chip 22, I FBi Refers to the current value on the second end 132 of the feedback line 13 electrically connected to the i-th driving chip 22.
In the embodiment of the present application, the plurality of light emitting modules 20 are divided into at least two light emitting module groups 201, and the light emitting module groups 201 include a plurality of light emitting modules 20 arranged in the first direction X. At least two light emitting module groups 201 are arranged along a second direction Y, and the first direction X intersects the second direction Y. Preferably, the first direction X is perpendicular to the second direction Y. As shown in fig. 2, the first direction X is a longitudinal direction of the display panel, and the second direction is a width direction of the display panel. Specifically, the first direction X may be a width direction of the display panel, and the second direction may be a length direction of the display panel
In the embodiment of the present application, the second ends 132 of the feedback lines 13 electrically connected to the light emitting modules 20 in the same light emitting module group 201 are electrically connected to the first nodes P of the light emitting module group 201, and the first ends 131 of the feedback lines 13 are electrically connected to at least two first nodes P. Preferably, the current steps of the driving chips 22 in the same light emitting module group 201 are the same, and the current values at the second ends 132 of the feedback lines 13 electrically connected to the light emitting modules 20 in the same light emitting module group 201 are equal, wherein N in formula I i Refers to a current gear corresponding to the ith row driving chip 22, I FBi Refers to the current value on the second end 132 of the feedback line 13 electrically connected to the i-th row driving chip 22.
In the embodiment of the application, the light-emitting substrate adjusts the power voltage value according to the power voltage variation value obtained by the first formula. Specifically, when the feedback signal provided by the driving chip 22 is that the voltage difference between the power supply voltage and the driving voltage required by the light emitting unit 21 to emit light is greater than the preset threshold, the light emitting substrate decreases the power supply voltage according to the power supply voltage variation value to obtain the target power supply voltage. Correspondingly, when the feedback signal provided by the driving chip 22 is that the voltage difference between the power supply voltage and the driving voltage required by the light emitting unit 21 to emit light is smaller than the preset threshold, the power supply voltage is increased according to the power supply voltage variation value to obtain the target power supply voltage.
In an embodiment of the present application, the preset threshold value ranges from 0.6 volts to 1.5 volts. Specifically, the preset threshold includes 0.6 volts, 0.7 volts, 0.8 volts, 0.9 volts, 1.0 volts, 1.1 volts, 1.2 volts, 1.3 volts, 1.4 volts, 1.5 volts. Preferably, the preset threshold is 0.6 volts. That is, when the voltage difference between the power supply voltage supplied from the power supply module 10 and the driving voltage required for light emission of the light emitting unit 21 is greater than 0.6 v, a gear current smaller than the initial gear current is selected as the target gear current. Correspondingly, when the voltage difference between the power supply voltage supplied from the power supply module 10 and the driving voltage required for the light emission of the light emitting unit 21 is less than 0.6 v, a gear current larger than the initial gear current is selected as the target gear current.
In the embodiment of the present application, the plurality of second ends 122 of the power cord 12 are electrically connected to the plurality of light emitting modules 20, respectively. Specifically, the second ends 122 of the power lines 12 electrically connected to the light emitting modules 20 in the same light emitting module group 201 are electrically connected to the second node N of the light emitting module group 201, the light emitting module group 201 includes a first light emitting module group 201a and a plurality of second light emitting module groups 201b, the first light emitting module group 201a is further electrically connected to the first end 121 of the power lines 12, and the first light emitting module group 201a and the plurality of second light emitting module groups 201b are electrically connected through the second node N.
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 that: the second ends 122 of the power line 12 electrically connected to the light emitting modules 20 in the same light emitting module group 201 are electrically connected to the second node N of the light emitting module group 201, and the first end 121 of the power line 12 is electrically connected to at least two second nodes N.
Specifically, the backlight driver 200 includes a power supply module 10 and a plurality of light emitting modules 20, and 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. The power line 12 and the feedback line 13 each have a first end and a plurality of second ends, the first end 121 of the power 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 module 10 is configured to control the voltage output terminal 111 to output a power supply voltage based on the 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, an anode a of the light emitting unit 21 is electrically connected to the second end 122 of the power line 12, and a 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 driver chip 22 is electrically connected to the second end 132 of the feedback line 13. The driving chip 22 is for driving the corresponding light emitting unit 21 to emit light, and outputting a feedback signal to the power supply unit 11 based on the power supply voltage.
Specifically, the plurality of light emitting modules 20 includes at least two light emitting module groups 201, and the light emitting module groups 201 include a plurality of light emitting modules 20 arranged in the first direction X. At least two light emitting module groups 201 are arranged along a second direction Y, the first direction X being perpendicular to the second direction Y. The second ends 132 of the feedback lines 13 electrically connected to the light emitting modules 20 in the same light emitting module group 201 are electrically connected to the first nodes P of the light emitting module group 201, and the first ends 131 of the feedback lines 13 are electrically connected to at least two first nodes P.
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 that: the power module 10 further includes a resistor 30, the resistor 30 being electrically connected to each of the first nodes P and the first end 131 of the feedback line 13.
Specifically, the backlight driver 300 includes a power supply module 10 and a plurality of light emitting modules 20, and the power supply module 10 includes a power supply unit 11, a resistor 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. The power line 12 and the feedback line 13 each have a first end and a plurality of second ends, the first end 121 of the power 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 module 10 is configured to control the voltage output terminal 111 to output a power supply voltage based on the 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, an anode a of the light emitting unit 21 is electrically connected to the second end 122 of the power line 12, and a 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 driver chip 22 is electrically connected to the second end 132 of the feedback line 13. The driving chip 22 is used for driving the corresponding light emitting unit 21 to emit light, and outputting a feedback signal to the power supply unit 11 based on a voltage difference between a power supply voltage and a driving voltage required for the light emitting unit to emit light.
Specifically, the plurality of light emitting modules 20 includes at least two light emitting module groups 201, and the light emitting module groups 201 include a plurality of light emitting modules 20 arranged in the first direction X. At least two light emitting module groups 201 are arranged along a second direction Y, the first direction X being perpendicular to the second direction Y. The second ends 132 of the feedback lines 13 electrically connected to the light emitting modules 20 in the same light emitting module group 201 are electrically connected to the first nodes P of the light emitting module group 201, and the first ends 131 of the feedback lines 13 are electrically connected to at least two first nodes P.
In the embodiment of the present application, the plurality of second ends 122 of the power cord 12 are electrically connected to the plurality of light emitting modules 20, respectively. Specifically, the second ends 122 of the power lines 12 electrically connected to the light emitting modules 20 in the same light emitting module group 201 are electrically connected to the second node N of the light emitting module group 201, the light emitting module group 201 includes a first light emitting module group 201a and a plurality of second light emitting module groups 201b, the first light emitting module group 201a is further electrically connected to the first end 121 of the power lines 12, and the first light emitting module group 201a and the plurality of second light emitting module groups 201b are electrically connected through the second node N.
In the embodiment of the present application, the resistance of the resistor 30 is positively correlated with the length of the power line 12 from the corresponding light emitting module group 201 to the voltage output terminal 121. Specifically, the different light emitting modules 20 are different in distance from the voltage output end 111 of the power module 10, the resistor 30 on the power line 12 affects the voltage drop in the power voltage transmission process, so that the power voltage received by the light emitting module 20 farther from the voltage output end 111 is smaller than the power voltage received by the light emitting module 20 nearer to the voltage output end 111, therefore, the embodiment of the application sets the resistor 30 with different resistance values on the feedback line 13, so that the control weight of the resistor 30 electrically connected with the different light emitting module group 201 to the change value of the voltage is different, wherein the control weight of the resistor 30 electrically connected with the light emitting module group 201 farther from the voltage output end 111 to the change value of the voltage is higher than the control weight of the resistor 30 electrically connected with the light emitting module group 201 nearer to the voltage output end 111 to the change value of the voltage, which is beneficial to shortening the time required by dynamic voltage regulation, and meanwhile, ensuring that the light emitting module 20 farther from the voltage output end 111 quickly reaches the target driving voltage value, and improving the brightness uniformity.
In the embodiment of the present application, the change value of the power supply voltage is calculated according to the formula two:
(equation II)
Wherein DeltaVLED refers to the variation value of the power supply voltage, R i Refers to the resistor 30, n electrically connected to the ith light emitting module group 201 i Refers to the current gear corresponding to the ith driving chip 22, I FBi Refers to the current value on the second end 132 of the feedback line 13 electrically connected to the i-th driving chip 22.
In the examples of the present application, R i Resistance value of (C) is greater than R 1 This arrangement is advantageous in shortening the time required for dynamic voltage adjustment, and at the same time, ensures that the light emitting module 20 farther from the voltage output terminal 111 reaches the target driving voltage value quickly, and improves brightness uniformity.
As shown in fig. 5, the embodiment of the present application provides a light emitting substrate 400, and the light emitting substrate 400 is different from the light emitting substrate 100 in that: the light emitting substrate further comprises a compensation region 101, the compensation region 101 is provided with a plurality of light emitting module groups 201 and a resistor 30, and the resistor 30 is arranged between at least part of the light emitting module groups 201 in the plurality of light emitting module groups 201 in the compensation region 101 and the first end 131 of the feedback line 13. The resistance of the resistor 30 is positively correlated with the length of the power line 12 from the corresponding light emitting module group 201 to the voltage output terminal 121.
Specifically, the number of compensation regions 101 may be 2, 3, 4,..n, n being a positive integer. The number of light emitting module groups 201 in each compensation zone 101 may be 2, 3, 4. The number of resistors 30 provided in each compensation zone 101 may be 1, 2, 3, 4,..n, n being a positive integer, and the number of resistors 30 in each compensation zone 101 may or may not be equal. In fig. 5, only one compensation area 101 is provided, and one compensation area 101 includes three light emitting module groups 201, wherein a resistor 30 is provided between two of the light emitting module groups 201 and the power module 10.
Specifically, the backlight driver 400 includes a power supply module 10 and a plurality of light emitting modules 20, and the power supply module 10 includes a power supply unit 11, a resistor 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. The power line 12 and the feedback line 13 each have a first end and a plurality of second ends, the first end 121 of the power 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 module 10 is configured to control the voltage output terminal 111 to output a power supply voltage based on the 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, an anode a of the light emitting unit 21 is electrically connected to the second end 122 of the power line 12, and a 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 driver chip 22 is electrically connected to the second end 132 of the feedback line 13. The driving chip 22 is for driving the corresponding light emitting unit 21 to emit light, and outputting a feedback signal to the power supply unit 11 based on the power supply voltage.
Specifically, the plurality of light emitting modules 20 includes at least two light emitting module groups 201, and the light emitting module groups 201 include a plurality of light emitting modules 20 arranged in the first direction X. At least two light emitting module groups 201 are arranged along a second direction Y, the first direction X being perpendicular to the second direction Y. The second ends 132 of the feedback lines 13 electrically connected to the light emitting modules 20 in the same light emitting module group 201 are electrically connected to the first nodes P of the light emitting module group 201, and the first ends 131 of the feedback lines 13 are electrically connected to at least two first nodes P.
In the embodiment of the present application, the plurality of second ends 122 of the power cord 12 are electrically connected to the plurality of light emitting modules 20, respectively. Specifically, the second ends 122 of the power lines 12 electrically connected to the light emitting modules 20 in the same light emitting module group 201 are electrically connected to the second node N of the light emitting module group 201, the light emitting module group 201 includes a first light emitting module group 201a and a plurality of second light emitting module groups 201b, the first light emitting module group 201a is further electrically connected to the first end 121 of the power lines 12, and the first light emitting module group 201a and the plurality of second light emitting module groups 201b are electrically connected through the second node N.
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 that: the power module 10 further includes a resistor 30, the resistor 30 being disposed between two adjacent light emitting module groups 201. The resistance of the resistor 30 is positively correlated with the length of the power line 12 from the corresponding light emitting module group 201 to the voltage output terminal 121.
Specifically, the backlight driver 500 includes a power supply module 10 and a plurality of light emitting modules 20, and the power supply module 10 includes a power supply unit 11, a resistor 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. The power line 12 and the feedback line 13 each have a first end and a plurality of second ends, the first end 121 of the power 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 module 10 is configured to control the voltage output terminal 111 to output a power supply voltage based on the 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, an anode a of the light emitting unit 21 is electrically connected to the second end 122 of the power line 12, and a 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 driver chip 22 is electrically connected to the second end 132 of the feedback line 13. The driving chip 22 is for driving the corresponding light emitting unit 21 to emit light, and outputting a feedback signal to the power supply unit 11 based on the power supply voltage.
Specifically, the plurality of light emitting modules 20 includes at least two light emitting module groups 201, and the light emitting module groups 201 include a plurality of light emitting modules 20 arranged in the first direction X. At least two light emitting module groups 201 are arranged along a second direction Y, the first direction X being perpendicular to the second direction Y. The second ends 132 of the feedback lines 13 electrically connected to the light emitting modules 20 in the same light emitting module group 201 are electrically connected to the first nodes P of the light emitting module group 201, and the first ends 131 of the feedback lines 13 are electrically connected to at least two first nodes P.
In the embodiment of the present application, the plurality of second ends 122 of the power cord 12 are electrically connected to the plurality of light emitting modules 20, respectively. Specifically, the second ends 122 of the power lines 12 electrically connected to the light emitting modules 20 in the same light emitting module group 201 are electrically connected to the second node N of the light emitting module group 201, the light emitting module group 201 includes a first light emitting module group 201a and a plurality of second light emitting module groups 201b, the first light emitting module group 201a is further electrically connected to the first end 121 of the power lines 12, and the first light emitting module group 201a and the plurality of second light emitting module groups 201b are electrically connected through the second node N.
As shown in fig. 7, the present application further provides a driving method applied to the above light-emitting substrate, including:
s10, acquiring an initial power supply voltage value provided by the power supply module and a driving voltage value required by light emission of the light emitting module.
Specifically, the light emitting module includes a light emitting unit and a driving chip, and the step S10 of obtaining a driving voltage value required for light emission of the light emitting module refers to obtaining a driving voltage value required for light emission of the light emitting unit.
S20, calculating a voltage difference value between the initial power supply voltage value and the driving voltage value.
Specifically, the anode of the light emitting unit is electrically connected with the power module, the cathode of the light emitting unit is electrically connected with the driving chip, and the voltage difference between the initial power supply voltage value and the driving voltage value is the voltage value input into the driving chip.
S30, outputting a feedback signal according to the voltage difference value.
And S40, adjusting the initial power supply voltage value to be a target power supply voltage value according to the feedback signal.
Specifically, the driving chip generates a corresponding feedback signal according to the detected voltage difference value and outputs the feedback signal to the power supply module, wherein the smaller the intensity of the feedback signal is, the larger the initial power supply voltage output by the power supply module is; conversely, the greater the strength of the feedback signal, the smaller the initial supply voltage output by the power module.
As shown in fig. 8, step S30 includes:
s301, acquiring initial gear current of the light emitting module.
In the embodiment of the present application, a plurality of shift currents are preset in the driving chip 22 according to the display luminance range, and the correspondence relationship between the light emission luminance of the light emitting unit 21 and the driving current is established. Wherein, the light-emitting brightness is positively correlated with the driving current, namely, the larger the light-emitting brightness is, the larger the driving current is; the smaller the light emission luminance, the smaller the drive current. The current range can be determined by determining the maximum current value corresponding to the maximum display luminance and the minimum current value corresponding to the minimum display luminance. For example, a maximum display luminance of 1600 candelas per square meter corresponds to a maximum current value of 7 milliamps, and a minimum display luminance of 600 candelas per square meter corresponds to a minimum current value of 1 milliamp, then the current range is 1 milliamp to 7 milliamps.
Further, a plurality of current values in the current range are set as the shift current. The gear current comprises at least two, i.e. the maximum current value and the minimum current value of the current range are each one gear current. On the basis, a current value can be selected as a gear current at fixed values every interval between the maximum current value and the minimum current value. For example, the plurality of current values in the current range includes four gear currents of 1 milliamp, 3 milliamp, 5 milliamp, and 7 milliamp, respectively. Further, the plurality of shift currents have a correspondence with the gray scale. The larger the gear current is, the larger the gray scale value is; the smaller the gear current, the smaller the gray scale value. The gear current comprises a plurality of gear currents, and the driving chip can adjust the initial gear current to the corresponding target gear current according to the power supply voltage value.
S302, judging whether the voltage difference value is larger than a preset threshold value.
S303, adjusting the initial gear current to the target gear current according to the judging result.
In the embodiment of the present application, the median value among the plurality of gear currents is taken as the initial gear current, and when the voltage difference between the power supply voltage supplied by the power supply module 10 and the driving voltage required for light emission of the light emitting unit 21 is greater than the preset threshold value, the gear current of the driving chip is negatively adjusted, that is, the gear current smaller than the initial gear current is selected as the target gear current. Correspondingly, when the voltage difference between the power supply voltage supplied by the power supply module 10 and the driving voltage required for the light emission of the light emitting unit 21 is smaller than the preset threshold value, the shift current of the driving chip is adjusted in the forward direction, that is, a shift current larger than the initial shift current is selected as the target shift current.
Specifically, if the voltage difference is greater than a preset threshold, the initial gear current is reduced to the target gear current. And if the voltage difference value is smaller than the preset threshold value, the initial gear current is increased to the target gear current.
S304, outputting a feedback signal according to a target driving current value corresponding to the target gear current.
And S305, adjusting the initial power supply voltage value to be a target power supply voltage value according to the feedback signal.
In an embodiment of the present application, the preset threshold value ranges from 0.6 volts to 1.5 volts. When the voltage difference between the power supply voltage and the driving voltage required by the light emitting unit to emit light is between 0.6 volt and 1.5 volt, the service life of the driving chip is prolonged, and the display effect of the light emitting substrate is improved.
The foregoing description of the embodiments of the present application provides a light emitting substrate and a driving method, and the foregoing description of the embodiments is only for helping to understand the core idea of the present application, and should not be construed as limiting the protection scope of the present application.
Claims (10)
1. A light-emitting substrate, comprising:
the power supply module comprises a power supply unit, a power line and a feedback line, wherein the power supply unit comprises a voltage output end and a signal receiving end, the power line and the feedback line are respectively provided with a first end and a plurality of second ends, the first end of the power line is electrically connected with the voltage output end, the first end of the feedback line is electrically connected with the signal receiving end, and the power supply module is used for controlling the voltage output end to output power supply voltage based on a feedback signal received by the signal receiving end;
the light-emitting modules are respectively and electrically connected with the second ends of the power lines, are respectively and electrically connected with the second ends of the feedback lines, and are used for emitting light under the drive of the power supply voltage and outputting the feedback signals to the power supply unit based on the power supply voltage.
2. The light emitting substrate of claim 1, wherein the light emitting module comprises a light emitting unit and a driver chip, the driver chip comprises a first pin and a second pin, an anode of the light emitting unit is electrically connected to the second end of the power line, a cathode of the light emitting unit is electrically connected to the first pin of the driver chip, and the second pin of the driver chip is electrically connected to the second end of the feedback line.
3. The light emitting substrate according to claim 2, wherein a plurality of the light emitting modules are divided into at least two light emitting module groups, the light emitting module groups including a plurality of the light emitting modules arranged in a first direction, the at least two light emitting module groups being arranged in a second direction, the first direction intersecting the second direction.
4. A light emitting substrate according to claim 3 wherein a plurality of second ends of the feedback lines electrically connected to a plurality of the light emitting modules in the same light emitting module group are electrically connected to first nodes of the light emitting module group, respectively, and the first ends of the feedback lines are electrically connected to at least two of the first nodes.
5. The light-emitting substrate according to claim 3 or 4, wherein a plurality of second ends of the power lines electrically connected to the light-emitting modules of the same light-emitting module group are electrically connected to a second node of the light-emitting module group, respectively, and a first end of the power lines is electrically connected to at least two of the second nodes.
6. The lighting substrate of claim 4, wherein the power module further comprises a resistor disposed between at least a portion of the plurality of light module groups and the first end of the feedback line.
7. The light-emitting substrate according to claim 6, wherein a resistance value of the resistor is positively correlated with a length of the power line from the corresponding light-emitting module group to the voltage output terminal.
8. The light-emitting substrate according to claim 1, wherein the power supply unit comprises an ac-dc converter including a voltage input terminal for receiving an ac voltage, the voltage output terminal for receiving the feedback signal, and the signal receiving terminal for controlling an output of the power supply voltage based on the feedback signal.
9. A driving method, characterized by comprising:
acquiring an initial power supply voltage value provided by a power supply module and a driving voltage value required by 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 according to the voltage difference;
and adjusting the initial power supply voltage value to a target power supply voltage value according to the feedback signal.
10. The driving method according to claim 9, wherein the step of outputting a feedback signal according to the voltage difference value, and adjusting the initial power supply voltage value to a target power supply voltage value according to the feedback signal comprises:
acquiring an initial gear current of the light emitting module;
judging whether the voltage difference is larger than a preset threshold value or not;
adjusting the initial gear current to a target gear current according to a judging result;
outputting a feedback signal according to a target driving current value corresponding to the target gear current;
and adjusting the initial power supply voltage value to a target power supply voltage value according to the feedback signal.
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