CN218038531U - Lamp bead driving circuit and display device - Google Patents
Lamp bead driving circuit and display device Download PDFInfo
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- CN218038531U CN218038531U CN202221385083.7U CN202221385083U CN218038531U CN 218038531 U CN218038531 U CN 218038531U CN 202221385083 U CN202221385083 U CN 202221385083U CN 218038531 U CN218038531 U CN 218038531U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The utility model discloses a lamp pearl drive circuit and display device, lamp pearl drive circuit are connected with at least one lamp pearl, and lamp pearl drive circuit includes: the light sensing module and the control module; the system comprises a control module, a photoinduction module, a lamp bead, a lamp bulb and a lamp holder, wherein at least one photoinduction module is arranged and connected with the control module, and the photoinduction module is used for collecting brightness signals of the lamp bead and feeding the brightness signals back to the control module; the control module is respectively connected with the photoinduction module and the lamp beads and is used for sending current data to the lamp beads through command frames so as to set the driving current of the lamp beads and adjusting the driving current according to the brightness signals; the control module is also used for sending display data to the lamp beads through the data frames so as to control the lamp beads to display different gray-scale images. The utility model discloses luminance signal according to the feedback can be adjusted the luminance of lamp pearl to can avoid making the inconsistent influence of luminance between the different lamp pearls with the gray scale and showing the picture effect because of the inconsistency of lamp pearl luminance.
Description
Technical Field
The utility model relates to a show technical field, what especially relate to is a lamp pearl drive circuit and display device.
Background
In a decoration or display device including a plurality of Light-Emitting Diode (LED) beads, such as a guardrail tube, a decoration screen, various outdoor display screens, and an LED backlight, there is a brightness difference between the beads, and the difference mainly includes three parts: 1) the brightness difference of each lamp bead chip caused by self manufacturing error, 2) the brightness difference of the packaged lamp bead chips caused by packaging materials (fluorescent powder) and processing errors, and 3) the brightness difference of the packaged lamp beads caused by different circuit parasitic effects after the packaged lamp beads are assembled in a system. The brightness difference introduced by each part of the three parts is assumed to be +/-3%, the brightness difference of the lamp beads under the worst condition reaches +/-9%, and the brightness inconsistency causes the brightness inconsistency among different lamp beads with the same gray scale, so that the effect of displaying pictures is influenced.
Accordingly, there is a need for improvements and developments in the art.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned prior art not enough, an object of the utility model is to provide a lamp pearl drive circuit and display device to make the luminance inconsistent between the different lamp pearls with the gray scale because of the inconsistency of lamp pearl luminance among the current display device of solution, lead to influencing the problem of display frame.
The technical scheme of the utility model as follows:
the utility model provides a lamp pearl drive circuit, is connected with at least one lamp pearl, and lamp pearl drive circuit includes: the light sensing module and the control module; wherein,
the light sensing module is used for collecting brightness signals of the lamp beads and feeding the brightness signals back to the control module;
the control module is respectively connected with the light sensing module and the lamp beads, and is used for sending current data to the lamp beads through a command frame so as to set the driving current of the lamp beads and adjusting the driving current according to the brightness signal;
the control module is also used for sending display data to the lamp beads through the data frames so as to control the lamp beads to display different gray-scale images.
The utility model discloses a further setting, photoinduction module is provided with a plurality of, with the lamp pearl correspond the setting and respectively with control module connects, each response module gathers the luminance signal of corresponding lamp pearl respectively and feeds back to control module.
The utility model discloses a further setting, photoinduction module is a kind of photo resistance, photodiode, phototriode or camera.
The utility model discloses a further setting, data transmission between control module and the lamp pearl passes through power cord or bus connection.
The utility model discloses a further setting, control module is little the control unit.
Based on same utility model the design, the utility model also provides a display device, including at least one lamp pearl and above-mentioned lamp pearl drive circuit, lamp pearl drive circuit with the lamp pearl is connected, the lamp pearl includes: a driving unit and a light emitting unit;
the driving unit is respectively connected with the control module and the light-emitting unit, and is used for outputting driving current to the light-emitting unit according to the current data output by the control module so as to control the brightness of the light-emitting unit;
the light sensing module is used for collecting a brightness signal generated by the light emitting unit and feeding the brightness signal back to the control module, and the control module adjusts the magnitude of the driving current according to the brightness signal.
The utility model discloses a further setting, the lamp pearl is provided with a plurality of, and a plurality of the lamp pearl is established ties, is parallelly connected or the connection in series-parallel.
The utility model discloses a further setting, drive unit includes: the constant current source, the first MOS tube and the second MOS tube; wherein,
the input end of the constant current source is connected with the positive end of a power line, and the output end of the constant current source is respectively connected with the first end of the first MOS tube and the control end of the second MOS tube;
the control end of the first MOS tube is connected with the control end of the second MOS tube, the first end of the second MOS tube is connected with the light-emitting unit, and the second end of the first MOS tube is connected with the second end of the second MOS tube and connected to the negative end of the power line.
The utility model discloses a further setting, drive unit includes: the constant current source and the third MOS tube; the input end of the constant current source is connected with the light-emitting unit, the output end of the constant current source is connected with the first end of the third MOS tube, the second end of the third MOS tube is connected with the negative end of the power line, and the control end of the third MOS tube is connected with the pulse width modulation signal end of the control module.
The utility model discloses a further setting, the lamp pearl still includes: the memory is connected with the control module and used for storing the current data output by the control module.
The utility model provides a lamp pearl drive circuit and display device, lamp pearl drive circuit is connected with at least one lamp pearl, and lamp pearl drive circuit includes: the light sensing module and the control module; the light induction module is used for collecting brightness signals of the lamp beads and feeding the brightness signals back to the control module; the control module is respectively connected with the light sensing module and the lamp beads, and is used for sending current data to the lamp beads through a command frame so as to set the driving current of the lamp beads and adjusting the driving current according to the brightness signal; the control module is also used for sending display data to the lamp beads through the data frames so as to control the lamp beads to display different gray-scale images. The utility model discloses a photoinduction module gathers the luminance signal of lamp pearl and feeds back to control module to detect the luminous luminance to the lamp pearl, control module can adjust drive current's size according to the luminance signal of feedback, thereby can adjust the luminance of lamp pearl, thereby can avoid making the inconsistent influence of luminance between the different lamp pearls of same gray scale to show the picture effect because of the inconsistency of lamp pearl luminance.
Drawings
In order to clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is the circuit schematic block diagram of the utility model discloses well lamp pearl drive circuit is connected with the lamp pearl.
Fig. 2 is a circuit schematic diagram of the utility model discloses well lamp pearl drive circuit is connected with the parallelly connected lamp pearl of a plurality of.
Fig. 3 is a circuit schematic diagram of the utility model discloses well lamp pearl drive circuit and a plurality of series connection lamp pearl are connected.
Fig. 4 is a circuit schematic diagram of a lamp bead in an embodiment of the utility model.
Fig. 5 is a schematic circuit diagram of a lamp bead in another embodiment of the present invention.
The various symbols in the drawings: 100. a control module; 200. a light sensing module; 300. a lamp bead; 301. a drive unit; 302. a light emitting unit; 303. a memory.
Detailed Description
The utility model provides a lamp pearl drive circuit and display device, for making the utility model discloses a purpose, technical scheme and effect are clearer, clear and definite, and it is right that the following reference is made to the drawing and the example is lifted the utility model discloses further detailed description. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description and claims, the terms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. If there is a description in an embodiment of the present invention referring to "first", "second", etc., the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1 to 5, the present invention provides a preferred embodiment of a display device.
As shown in fig. 1, the utility model provides a display device, including at least one lamp pearl 300 and with the lamp pearl drive circuit that lamp pearl 300 is connected, lamp pearl drive circuit is used for setting up the drive current of lamp pearl 300 with the luminance of control lamp pearl 300 to send display data to lamp pearl 300, show different gray scale images with control lamp pearl 300.
In some embodiments, the lamp bead driving circuit is connected to at least one lamp bead 300, and the lamp bead driving circuit includes a photo sensing module 200 and a control module 100; at least one light sensing module 200 is provided and connected to the control module 100, and the light sensing module 200 is configured to collect a brightness signal of the lamp bead 300 and feed the brightness signal back to the control module 100; the control module 100 is respectively connected to the light sensing module 200 and the lamp bead 300, and the control module 100 is configured to send current data to the lamp bead through a command frame to set a driving current of the lamp bead 300, and adjust the driving current according to the brightness signal; the control module 100 is further configured to send current data to the lamp bead through the command frame to send display data to the lamp bead 300, so as to control the lamp bead 300 to display different grayscale images.
Specifically, the control module 100 is a Micro Control Unit (MCU), the model of which may be APM32F103X4, the control module 100 includes a brightness setting function and a normal function, the brightness setting function refers to that the control module 100 sets a current by sending current data to the lamp beads 300 through a command frame, so as to obtain brightness, wherein the control module 100 further has a current calibration function, so that a maximum brightness deviation of each lamp bead 300 in the system can be maintained within a minimum value range; the normal function is a function of displaying a static or dynamic picture by transmitting display data through a data frame after the maximum brightness is set, that is, displaying images of different gray scales.
The lamp bead 300 includes a driving unit 301 and a light emitting unit 302, the driving unit 301 is connected to the control module 100 and the light emitting unit 302, the driving unit 301 is configured to set a driving current of the light emitting unit 302 according to current data sent by the control module 100 through a command frame, and output the driving current to the light emitting unit 302 to control the brightness of the light emitting unit 302, where the command frame includes a lamp bead address and current data, and when the command frame address received by the driving unit 301 is the same as the self address, the current data of the command frame is converted into the driving current of the light emitting unit 302, where the current data is the driving current data corresponding to the maximum grayscale brightness of the lamp bead 300. The light emitting unit 302 is an LED device, and can emit light under current driving, and the light emitting intensity of the LED device is in a positive correlation with the flowing power. The driving unit 301 further displays the display data transmitted through the data frame by the control module 100, for displaying different grayscale images at the set driving current.
The light sensing module 200 is connected to the control module 100, and is configured to collect a brightness signal generated by the light emitting unit 302, convert the brightness signal into a brightness electrical signal, and feed back the brightness electrical signal to the control module 100, where the control module 100 adjusts current data according to the brightness signal to adjust the driving current. The control module 100 receives a brightness electrical signal Vcur output by the light sensing module 200, if Vmin < Vcur < Vmax, the driving current is not adjusted, if Vcur < Vmin, current data is output to the lamp bead 300 to increase the driving current, and if Vcur > Vmax, the current data is output to the lamp bead 300 to decrease the driving current; and after the driving current is adjusted, continuously comparing the relation between Vcur after the current is adjusted and Vmax and Vmin, if Vmin < Vcur < Vmax, not adjusting the driving current, and otherwise, continuously adjusting the driving current until the condition that Vmin < Vcur < Vmax is met. By the method, current data corresponding to the maximum driving current is finally obtained, so that the maximum brightness difference between the lamp beads 300 in the system is smaller than Vmax-Vmin, and the maximum brightness deviation of the lamp beads 300 in the system can be kept in a minimum value range.
Vmin and Vmax are preset values, vmin is the minimum value of the brightness of the lamp bead which can be tolerated by the system under the maximum gray scale, and Vmax is the maximum value of the brightness of the lamp bead which can be tolerated by the system under the maximum gray scale. It should be noted that Vmin and Vmax can also be the minimum value and the maximum value of the brightness of the lamp bead that can be tolerated by the system under a certain gray scale, and Vmin and Vmax values under the maximum gray scale can also be obtained by multiplying a fixed coefficient respectively.
The maximum brightness value Vmax of the lamp bead refers to the brightness corresponding to the maximum gray scale, if the display data is 8 bits, the corresponding brightness is adjustable from low to high by 0-255 levels, each level corresponds to one gray scale, and the 255 th level corresponds to the maximum gray scale, namely the maximum brightness. The display data may be converted into different current levels to obtain different gray scale images, or may be converted into a PWM (pulse width modulation) mode to obtain different gray scale images. If the display data are converted into different current magnitudes to obtain different gray scale images, each gray scale corresponds to a current; if the display data is converted into a PWM manner to obtain images with different gray scales, each gray scale corresponds to a duty (duty ratio) of PWM.
It should be noted that the current data and the normal display data are separated by a command frame and a data frame, and after each power-on, the command frame is only required to be sent once, or the command frame is sent once at periodic intervals after the power-on, so as to improve the effective data transmission efficiency. The effective data transmission efficiency can be reduced because the data frames need to be sent continuously, and if the data frames are provided with the maximum current data every time, the length of the transmitted data is increased, and the data transmission time is increased.
It is visible, the utility model discloses not only can set up the drive current of lamp pearl 300 through control module 100 in order to set up the luminance of lamp pearl 300, can also send display data to lamp pearl 300 control lamp pearl 300 and show different gray scale images, and can gather the luminance signal of lamp pearl 300 and feed back to control module 100 through photo-sensing module 200, with the luminous luminance to lamp pearl 300 detects, control module 100 can adjust drive current's size according to the luminance signal of feedback, thereby can adjust the luminance of lamp pearl 300, and then can avoid making the inconsistent luminance influence display picture effect between the different lamp pearls 300 of same gray scale because of the inconsistency of lamp pearl 300 luminance, in order to reach the purpose that improves picture display effect.
Referring to fig. 2 and 3, in some embodiments, the plurality of light sensing modules 200 are disposed corresponding to the lamp beads 300 and are respectively connected to the control module 100, and each of the sensing modules respectively collects a brightness signal of the corresponding lamp bead 300 and feeds the brightness signal back to the control module 100.
Specifically, taking Y photo-sensing modules 200 and X beads 300 as examples, 1< = Y < = X, that is, if Y is 1, only one photo-sensing module 200 is used, and each bead is tested by the photo-sensing module 200 in sequence, and the brightness of the bead can be obtained only by testing X times; if Y = X, each lamp bead corresponds to one photo sensing module 200, and the brightness of all the lamp beads can be obtained only by testing once.
In some embodiments, the photo sensing module 200 is an electronic device such as a photo resistor, a photo diode, a photo transistor, or a camera capable of converting an optical signal into an electrical signal.
Referring to fig. 2 and 3, in some embodiments, a plurality of the lamp beads 300 are disposed, and the plurality of the lamp beads are connected in series, in parallel, or in series and parallel. And the data transmission between the control module 100 and the lamp bead 300 is connected through a power line or a bus.
Specifically, when the lamp beads 300 are connected in parallel, the lamp beads 300 are separately connected to a power line, and the current data of the control module 100 is transmitted to the lamp beads 300 by using a separate data path, for example, data transmission may be performed through a single bus or a DMX512 bus. When adopting the mode of establishing ties between lamp pearl 300, control module 100 modulates current data to the power cord, adopts the mode of power carrier promptly, and lamp pearl 300 can be followed the power cord and demodulated current data, like this alright in order to reduce the use of data line, has not only simplified circuit structure, easily walks the line and saves the cost. It should be noted that the modulation and demodulation of current data in string applications is prior art and therefore not described in detail herein.
Referring to fig. 4, in some embodiments, the driving unit 301 includes: the constant current source, the first MOS tube and the second MOS tube; the input end of the constant current source I1 is connected to a positive end Vin + of a power line, and the output end of the constant current source I1 is respectively connected to the first end of the first MOS transistor Q1 and the control end of the second MOS transistor Q2; the control end of the first MOS transistor Q1 is connected to the control end of the second MOS transistor Q2, the first end of the second MOS transistor Q2 is connected to the light emitting unit 302, and the second end of the first MOS transistor Q1 and the second end of the second MOS transistor Q2 are connected to the negative terminal Vin-of the power line.
Specifically, the first MOS transistor Q1 and the second MOS transistor Q2 form a mirror current source, the constant current source I1 is configured to set a maximum brightness of the light emitting unit 302, and different grayscale images can be displayed by setting a size ratio of the first MOS transistor Q1 (with a settable size) to the second MOS transistor Q2 (with a settable size), that is, the driving unit 301 can obtain different grayscale images by converting display data into different current magnitudes. The driving unit 301 receives current data sent by the control module 100 through a command frame, when a command frame address is equal to a self address, the current data of the command frame is converted into a current of the constant current source I1, the current flowing through the light emitting unit 302 is adjusted, after the current is adjusted, the control module 100 sends display data to the driving unit 301 through a data frame, and the driving unit 301 converts the display data into a size proportion of a mirror current source to obtain different gray scale images which are correspondingly displayed.
The constant current source I1 is an adjustable constant current source, and the control module 100 may output a control instruction to set a value of the constant current source I1 in a power carrier manner through a power line. Of course, the control module 100 may also be connected to the constant current source I1 through a separate data line to set the value of the constant current source I1.
Referring to fig. 5, in other embodiments, the driving unit 301 includes: a constant current source I1 and a third MOS tube Q3; the input end of the constant current source I1 is connected to the light emitting unit 302, the output end of the constant current source I1 is connected to the first end of the third MOS transistor Q3, the second end of the third MOS transistor Q3 is connected to the negative terminal Vin of the power line, and the control end of the third MOS transistor Q3 is connected to the pwm signal end of the control module 100.
Specifically, the control end of the third MOS transistor Q3 is connected to a Pulse Width Modulation (PWM) signal end of the micro control unit, and the micro control unit can control the on/off time of the third MOS transistor Q3 to display different gray-scale images, that is, can convert the display data into a PWM mode to obtain different gray-scale images. The driving unit 301 receives current data sent by the control module 100 through a command frame, when a command frame address is equal to a self address, the current data of the command frame is converted into a current of the constant current source I1, the current flowing through the light emitting unit 302 is adjusted, after the current is adjusted, the control module 100 sends display data to the driving unit 301 through a data frame, and the driving unit 301 converts the display data into a duty ratio signal to obtain different gray scale images which are correspondingly displayed.
Referring to fig. 4 and 5, in some embodiments, the lamp bead 300 further includes: a memory 303, wherein the memory 303 is connected to the control module 100, and the memory 303 is used for storing the current data output by the control module 100.
Specifically, the memory 303 is a nonvolatile memory, and if the lamp beads 300 are provided with the nonvolatile memory, the current data can be sent to the corresponding lamp beads 300 for storage through the command frame after each lamp bead 300 is calibrated, or the current data of each lamp bead 300 can be sent to the corresponding lamp beads for storage through the command frame after all the lamp beads 300 are calibrated, and then when the lamp beads 300 are powered on each time, the stored current data are automatically read out and used by the control module 100, and the control module 100 does not need to send the current data to the lamp beads 300 any more, so that the data sending time between the control module 100 and the lamp beads 300 is saved.
It should be noted that the current data may be a preset value or a calibrated current data value, if the current data is the preset value, the maximum brightness deviation between the lamp beads 300 is relatively large, and if the current data is the calibrated current data value, the maximum brightness deviation between the lamp beads 300 is relatively small, and the current data is selected by the user according to actual needs. The control module 100 sends the current data to the lamp bead 300 through the command frame after each power-on, or sends the current data to the lamp bead 300 through the command frame at periodic intervals after power-on.
The calibration function is typically calibrated only once when the product is shipped, and may be calibrated during maintenance. The calibration process is as follows: the corresponding quantity of the lamp beads 300 are lightened according to the quantity of the light sensing module 200, at this time, the current data of the lamp beads 300 is the current data corresponding to the maximum brightness preset by a user, the display data is the display data corresponding to the maximum gray scale, the control module 100 receives the brightness electric signal Vcur output by the corresponding light sensing module 200, if Vmin < Vcur < Vmax, the driving current is not adjusted, if Vcur < Vmin, the current data is increased to increase the driving current of the lamp beads 300, and if Vcur > Vmax, the current data is decreased to decrease the driving current of the lamp beads 300. After the driving current is adjusted, continuously comparing the relation between the Vcur after the current adjustment and Vmax, vmin, if Vmin < Vcur < Vmax, not adjusting the driving current, otherwise, continuously adjusting the driving current until Vmin < Vcur < Vmax is met, simultaneously storing the corresponding current data in a nonvolatile memory of the control module 100, and continuously calibrating the next lamp bead or the next group of lamp beads 300 after the completion until the brightness of all the lamp beads 300 is calibrated. If the lamp beads 300 are provided with a nonvolatile memory, the current data can be sent to the corresponding lamp beads 300 for storage through the command frame after each lamp bead 300 is calibrated, or the current data of each lamp bead 300 can be sent to the corresponding lamp beads 300 for storage through the command frame after all the lamp beads 300 are calibrated.
To sum up, the utility model provides a lamp pearl drive circuit and display device, the drive current that not only can set up the lamp pearl through control module is with the luminance that sets up the lamp pearl, can also send display data to lamp pearl control lamp pearl and show different gray scale images, and can gather the luminance signal of lamp pearl and feed back to control module through photoinduction module, detect with the luminous luminance to the lamp pearl, control module can adjust drive current's size according to the luminance signal of feedback, thereby can adjust the luminance of lamp pearl, and then can avoid making the inconsistent luminance influence display picture effect between the different lamp pearls of same gray scale because of the inconsistency of lamp pearl luminance, with the purpose that reaches improvement picture display effect.
It is to be understood that the invention is not limited to the above-described embodiments, and that modifications and variations may be made by those skilled in the art in light of the above teachings, and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides a lamp pearl drive circuit, is connected with at least one lamp pearl, its characterized in that, lamp pearl drive circuit includes: the light sensing module and the control module; wherein,
the light sensing module is used for collecting brightness signals of the lamp beads and feeding the brightness signals back to the control module;
the control module is respectively connected with the light sensing module and the lamp beads, and is used for sending current data to the lamp beads through a command frame so as to set the driving current of the lamp beads and adjusting the driving current according to the brightness signal;
the control module is also used for sending display data to the lamp beads through the data frames so as to control the lamp beads to display different gray-scale images.
2. The lamp bead driving circuit according to claim 1, wherein the plurality of photo sensing modules are disposed corresponding to the lamp beads and connected to the control module, respectively, and each of the photo sensing modules collects a brightness signal of the corresponding lamp bead and feeds the brightness signal back to the control module.
3. A lamp bead driving circuit according to claim 1 or 2, wherein the light sensing module is one of a photoresistor, a photodiode, a phototriode or a camera.
4. The lamp bead driving circuit of claim 1, wherein the data transmission between the control module and the lamp bead is through a power line or a bus connection.
5. The lamp bead driving circuit according to claim 1, wherein the control module is a micro control unit.
6. A display device comprising at least one lamp bead and the lamp bead driving circuit of any one of claims 1-5, the lamp bead driving circuit being connected to the lamp bead, wherein the lamp bead comprises: a driving unit and a light emitting unit;
the driving unit is respectively connected with the control module and the light-emitting unit, and is used for outputting driving current to the light-emitting unit according to the current data output by the control module so as to control the brightness of the light-emitting unit;
the light sensing module is used for collecting a brightness signal generated by the light emitting unit and feeding the brightness signal back to the control module, and the control module adjusts the magnitude of the driving current according to the brightness signal.
7. The display device as claimed in claim 6, wherein the lamp beads are provided in a plurality, and the plurality of lamp beads are connected in series, in parallel or in series and parallel.
8. The display device according to claim 6, wherein the driving unit comprises: the constant current source, the first MOS tube and the second MOS tube; wherein,
the input end of the constant current source is connected to the positive end of a power line, and the output end of the constant current source is respectively connected with the first end of the first MOS tube and the control end of the second MOS tube;
the control end of the first MOS tube is connected with the control end of the second MOS tube, the first end of the second MOS tube is connected with the light-emitting unit, and the second end of the first MOS tube is connected with the second end of the second MOS tube and is connected with the negative end of a power line.
9. The display device according to claim 6, wherein the driving unit comprises: the constant current source and the third MOS tube; the input end of the constant current source is connected with the light-emitting unit, the output end of the constant current source is connected with the first end of the third MOS tube, the second end of the third MOS tube is connected with the negative end of the power line, and the control end of the third MOS tube is connected with the pulse width modulation signal end of the control module.
10. The display device according to claim 8 or 9, wherein the lamp bead further comprises: the memory is connected with the control module and used for storing the current data output by the control module.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118335005A (en) * | 2024-06-13 | 2024-07-12 | 集创北方(深圳)科技有限公司 | Constant current output unit calibration circuit, calibration method, display device and chip |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118335005A (en) * | 2024-06-13 | 2024-07-12 | 集创北方(深圳)科技有限公司 | Constant current output unit calibration circuit, calibration method, display device and chip |
| CN118335005B (en) * | 2024-06-13 | 2024-10-18 | 集创北方(深圳)科技有限公司 | Constant current output unit calibration circuit, calibration method, display device and chip |
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