CN113012624A - LED display device and driving method thereof - Google Patents
LED display device and driving method thereof Download PDFInfo
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- CN113012624A CN113012624A CN202010762417.7A CN202010762417A CN113012624A CN 113012624 A CN113012624 A CN 113012624A CN 202010762417 A CN202010762417 A CN 202010762417A CN 113012624 A CN113012624 A CN 113012624A
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- 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]
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Abstract
The embodiment of the application provides an LED display device and a driving method thereof. The LED display device includes: the display device comprises a driving circuit and a display circuit, wherein the driving circuit comprises at least three constant current sources, and the at least three constant current sources comprise a first constant current source, a second constant current source and a third constant current source; the first constant current source, the second constant current source and the third constant current source are used for outputting constant currents to the display circuit at different time sequences according to the time sequence control signals, and the display circuit is used for lighting the LEDs contained in the display circuit according to the constant currents. The device and the method thereof provided by the application can stagger the light emitting time of the LED through design drive, so that the load loaded on the driving chip at the same time is reduced, the RT and FT on the driving output wiring of the driving chip are reduced, the light emitting time control under each gray scale is more accurate, the color cast phenomenon under the low gray scale can be reduced, and the color cast compensation effect of the low gray scale is achieved.
Description
Technical Field
The present disclosure relates to display technologies, and in particular, to a Light Emitting Diode (LED) display device and a driving method thereof.
Background
A Mini LED (micro LED) has the advantages of small size, power saving, wide color gamut, long service life, and the like. In recent years, with the maturity of the Mini LED manufacturing process and the reduction of the price, there are more and more Mini LED direct display and backlight products, such as a direct-type Liquid Crystal Display (LCD), a backlight large screen video display, and the like. Among them, as the application range of the direct display field is expanded, the requirements for the display effect of the LED are also higher and higher. The current Mini LED is limited by the manufacturing process, and can only be driven in a Passive Mode (PM), i.e., a PM-Mini LED.
However, the parasitic capacitance on the driving signal line of the PM-Mini LED display screen can affect the change of the driving current when the driving end is turned on; the coupling capacitance causes delay of a Rising Time (RT) and a Falling Time (FT) of the current driving signal, thereby causing a time when the LED emits light to be inaccurately controlled. Particularly, in the case of low gray scale display, the LED current conduction light-emitting time is short, and RT and FT delays cause the difference between the LED light-emitting brightness and chromaticity and the design value to be more obvious, so that a severe low gray scale color cast phenomenon often occurs in the low gray scale display.
Therefore, how to precisely control the time of LED light emission and reduce the phenomenon of low gray scale color cast has become an important research topic in the technical field.
Disclosure of Invention
In view of the above deficiencies of the prior art, the present application discloses an LED display device and a driving method thereof, which aims to design and drive to stagger the light emitting time of an LED, so as to reduce the load loaded on a Driver IC at the same time, to reduce RT and FT on the driving output trace of the Driver IC, to control the light emitting time at each gray scale more accurately, and to reduce the color shift phenomenon at low gray scale, thereby achieving the color shift compensation effect at low gray scale.
In a first aspect, an embodiment of the present application discloses an LED display device, including:
the display device comprises a driving circuit and a display circuit, wherein the driving circuit comprises at least three constant current sources, and the at least three constant current sources comprise a first constant current source, a second constant current source and a third constant current source;
the output port of the first constant current source, the output port of the second constant current source and the output port of the third constant current source are respectively connected with the input port of the display circuit, at least two constant current sources of the first constant current source, the second constant current source and the third constant current source receive different time sequence control signals, and the time sequence control signals are used for controlling the constant current output time sequences of the first constant current source, the second constant current source and the third constant current source;
the first constant current source, the second constant current source and the third constant current source are used for outputting constant currents to the display circuit at different time sequences according to the time sequence control signals, and the display circuit is used for lighting LEDs contained in the display circuit according to the constant currents.
In the embodiment of the present application, the first constant current source, the second constant current source, and the third constant current source receive timing control signals for controlling timings at which the first constant current source, the second constant current source, and the third constant current source output constant currents, the first constant current source, the second constant current source, and the third constant current source output constant currents at different timings according to the timing control signals, and the display circuit receives the constant currents and lights the LEDs included in the display circuit at different timings according to the constant currents. The output constant current of the constant current source is output in different time sequences, and the light emitting time of the LED is staggered, so that the load loaded on the driving chip at the same time is reduced, the RT and FT on the driving output wiring of the driving chip are reduced, the light emitting time under each gray scale is controlled more accurately, the color cast phenomenon under the low gray scale can be reduced, and the color cast compensation effect of the low gray scale is achieved.
In a possible implementation manner of the first aspect, the timing control signal includes a first timing control signal and a second timing control signal; the first time sequence control signal and the second time sequence control signal are two control signals with different time sequences;
wherein at least two of the first, second, and third constant current sources receive the first timing control signal;
the constant current source other than the constant current source receiving the first timing control signal receives the second timing control signal.
In the embodiment of the application, the timing control signals connected with different constant current sources in the driving circuit are different. Specifically, two constant current sources may be connected to the same timing control signal, and the timing control signals connected to the other constant current sources are different; or the timing control signals of any two constant current sources are different. The mode that the constant current source is connected with the time sequence control signal can enable the constant current of the driving circuit to be output in different time sequences, stagger the light emitting time of the LED, and enable the load loaded on the driving chip at the same time to be reduced, so as to reduce RT and FT on the driving output wiring of the driving chip, enable the light emitting time control under each gray scale to be more accurate, and also can reduce the color cast phenomenon under the low gray scale, thereby playing the color cast compensation effect of the low gray scale.
In yet another possible implementation manner of the first aspect, the first constant current source and the second constant current source receive the first timing control signal;
the third constant current source receives the second timing control signal.
In yet another possible implementation manner of the first aspect, the first constant current source and the third constant current source receive the first timing control signal;
the second constant current source receives the second timing control signal.
In yet another possible implementation manner of the first aspect, the second constant current source and the third constant current source receive the first timing control signal;
the first constant current source receives the second timing control signal.
In yet another possible implementation manner of the first aspect, the timing control signal includes a first timing control signal, a second timing control signal, and a third timing control signal;
the first constant current source receives the first timing control signal;
the second constant current source receives the second timing control signal;
the third constant current source receives the third timing control signal; the first timing control signal, the second timing control signal and the third timing control signal are control signals of three different timings.
In the embodiment of the application, different constant current sources in the driving circuit are connected with different timing control signals. Specifically, the timing control signal connected to each of the three constant current sources may be different. The mode that different constant current sources in the driving circuit are connected with different time sequence control signals can output constant currents in different time sequences, the display circuit lights LEDs contained in the display circuit in different time sequences according to the constant currents after receiving the constant currents, the light emitting time of the LEDs is staggered, the load loaded on the driving chip at the same moment is reduced, the RT and FT on the driving output wiring of the driving chip are reduced, the light emitting time under each gray scale is controlled more accurately, the color cast phenomenon under the low gray scale can be reduced, and the color cast compensation effect of the low gray scale is achieved.
In yet another possible implementation manner of the first aspect, the display circuit includes:
a display unit and a scanning unit; wherein the display unit includes at least three row lines, at least three column lines, and an LED connected to one of the at least three row lines and one of the at least three column lines;
the scanning unit is connected with the at least three column lines;
the at least three row lines of the display unit are respectively connected with an output port of the first constant current source, an output port of the second constant current source and an output port of the third constant current source;
the display unit is used for lighting the LEDs contained in the display unit at different time sequences after receiving the constant currents output by the first constant current source, the second constant current source and the third constant current source and the selection signal output by the scanning unit.
In the embodiment of the application, after one end of the display unit receives the selection signal of the scanning unit and the other end of the display unit receives the constant currents with different time sequences output by the driving circuit, the LEDs contained in the display unit are lightened in the corresponding time sequences, so that the control of the light emitting time under each gray scale is more accurate.
In yet another possible embodiment of the first aspect, the display unit comprises at least one of a Micro LED, a Mini LED.
In a second aspect, the present application discloses a driving method for an LED display device, wherein the LED display device includes a driving circuit and a display circuit, the driving circuit includes at least three constant current sources, and the at least three constant current sources include a first constant current source, a second constant current source and a third constant current source; the driving method includes:
the first constant current source receives a first timing control signal and lights an LED (light emitting diode) which is communicated with the first constant current source in the display circuit according to the first timing control signal;
the second constant current source and/or the third constant current source receive a second time sequence control signal and light an LED (light emitting diode) which is communicated with the second constant current source and/or the third constant current source in the display circuit according to the second time sequence control signal; wherein a start time for lighting the LED in the second timing control signal is different from a start time for lighting the LED in the first timing control signal.
In the embodiment of the present application, the first constant current source, the second constant current source and/or the third constant current source may respectively stagger the time when the different constant current sources output the constant currents according to the timing control signal sent by the timing control unit, and the first constant current source, the second constant current source and/or the third constant current source may respectively enable the constant currents output by the different constant current sources to light the LEDs in different gray scales according to the current signal sent by the output current adjusting unit. Therefore, the light emitting time of the LED is staggered by designing and driving, so that the load loaded on the driving chip at the same time is reduced, the RT and FT on the driving output wiring of the driving chip are reduced, the control of the light emitting time under each gray scale is more accurate, the color cast phenomenon under the low gray scale can be reduced, and the color cast compensation effect of the low gray scale is achieved.
In one possible implementation of the second aspect, the driving method further includes:
the second constant current source receives the second time sequence control signal and lights an LED which is communicated with the second constant current source in the display circuit according to the second time sequence control signal;
the third constant current source receives a third time sequence control signal and lights an LED (light emitting diode) which is communicated with the third constant current source in the display circuit according to the third time sequence control signal; wherein the start time for lighting the LED in the first timing control signal, the start time for lighting the LED in the second timing control signal, and the start time for lighting the LED in the third timing control signal are all different.
In the embodiment of the present application, the timing control signals connected to each constant current source are different, the first constant current source is connected to the first timing control signal, the second constant current source is connected to the second timing control signal, and the third constant current source is connected to the third timing control signal, so that the constant currents output by the different constant current sources illuminate the LEDs in different gray scales. Therefore, the light emitting time of the LED is staggered by designing and driving, so that the load loaded on the driving chip at the same time is reduced, the RT and FT on the driving output wiring of the driving chip are reduced, the control of the light emitting time under each gray scale is more accurate, the color cast phenomenon under the low gray scale can be reduced, and the color cast compensation effect of the low gray scale is achieved.
The embodiment of the application aims at driving the staggered light emitting time of the LED through design, so that the load loaded on the driving chip at the same time is reduced, RT and FT on the driving output wiring of the driving chip are reduced, the control of the light emitting time under each gray scale is more accurate, the color cast phenomenon under the low gray scale can be reduced, and the color cast compensation effect of the low gray scale is achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings used in the embodiments or the background art of the present application will be briefly described below.
Fig. 1 is a schematic structural diagram of an LED display device according to an embodiment of the present disclosure;
fig. 2a is a schematic flowchart of a driving method according to an embodiment of the present disclosure;
fig. 2b is a schematic flow chart of another driving method provided in the embodiment of the present application;
fig. 3 is a schematic structural diagram of another LED display device provided in the embodiment of the present application;
fig. 4a is a schematic structural diagram of another LED display device provided in the embodiment of the present application;
fig. 4b is a schematic structural diagram of another LED display device provided in the embodiment of the present application;
FIG. 5 is a schematic diagram illustrating the effect of a conventional PWM signal to achieve gray scale modulation;
FIG. 6 is a timing diagram of the output of a conventional driving signal;
fig. 7 is a schematic diagram illustrating an output timing sequence of a driving signal according to an embodiment of the present disclosure;
FIG. 8 is a schematic diagram comparing driving signals according to an embodiment of the present disclosure;
fig. 9 is a schematic diagram of a constant current driving architecture according to an embodiment of the present application;
fig. 10 is a timing diagram of a timing control signal according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, the present application will be further described with reference to the accompanying drawings.
The terms "first" and "second," and the like in the description, claims, and drawings of the present application are used solely to distinguish between different objects and not to describe a particular order. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. Such as a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
In this application, "at least one" means one or more, "a plurality" means two or more, "at least two" means two or three and three or more, "and/or" for describing an association relationship of associated objects, which means that there may be three relationships, for example, "a and/or B" may mean: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one item(s) below" or similar expressions refer to any combination of these items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b," a and c, "" b and c, "or" a and b and c.
The embodiments of the present application will be described below with reference to the drawings.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an LED display device according to an embodiment of the present disclosure, where the device includes, but is not limited to, the following circuits or units:
a driving circuit 10 and a display circuit 20, wherein the driving circuit 10 includes at least three constant current sources including a first constant current source 101, a second constant current source 102, and a third constant current source 103.
The output port of the driving circuit 10 is connected to the input port of the display circuit 20, specifically, the first input port 111 of the first constant current source 101 is connected to the first output current adjusting unit, the second input port 112 of the first constant current source 101 is connected to the first timing control unit, and the output port 113 of the first constant current source 101 is connected to the first receiving port 211 of the display circuit 20; the first input port 121 of the second constant current source 102 is connected to a second output current adjusting unit, the second input port 122 of the second constant current source 102 is connected to a second timing control unit, and the output port 123 of the second constant current source 102 is connected to the second receiving port 212 of the display circuit 20; the first input port 131 of the third constant current source 103 is connected to a third output current adjusting unit, the second input port 132 of the third constant current source 103 is connected to a third timing control unit, and the output port 133 of the third constant current source 103 is connected to the third receiving port 213 of the display circuit 20.
When the cathode is shared, the first output current regulating unit is a power supply, when the anode is shared, the first output current regulating unit is grounded, and the second output current regulating unit, the third output current regulating unit and the first output current regulating unit are the same. The first output current adjusting unit is used for adjusting the output current of the first constant current source 101, the second output current adjusting unit is used for adjusting the output current of the second constant current source 102, and the third output current adjusting unit is used for adjusting the output current of the third constant current source 103. In addition, the time sequence control unit is used for outputting a time sequence control signal, and after the constant current source communicated with the time sequence control unit receives the time sequence control signal, the constant current source outputs a constant current at the starting time indicated by the time sequence control signal. Different constant current sources are connected with different time sequence control units, and time sequence control signals output by different time sequence control units can be the same or different. Specifically, the first timing control unit is configured to control a constant current output timing of the first constant current source 101, the second timing control unit is configured to control a constant current output timing of the second constant current source 102, and the third timing control unit is configured to control a constant current output timing of the third constant current source 103.
In the present embodiment, at least two of the first constant current source 101, the second constant current source 102, and the third constant current source 103 receive different timing control signals, the first constant current source 101, the second constant current source 102, and the third constant current source 103 output constant currents to the display circuit 20 at different timings according to the received timing control signals, the timing control signals control the constant current output timings of the first constant current source 101, the second constant current source 102, and the third constant current source 103, and the display circuit 20 receives the constant currents and lights up the LEDs included in the display circuit 20 according to the constant currents.
In particular, there are many possible implementations of the above-mentioned constant current source receiving the timing control signal.
Optionally, at least two of the first constant current source 101, the second constant current source 102 and the third constant current source 103 receive a first timing control signal; the constant current source other than the constant current source receiving the first timing control signal receives a second timing control signal; the first time sequence control signal and the second time sequence control signal are two control signals with different time sequences.
Further, the first constant current source 101 and the second constant current source 102 may receive a first timing control signal; the third constant current source 103 receives a second timing control signal, wherein the first timing control signal and the second timing control signal are two control signals with different timings. In this embodiment, the timing control signals output by the first timing control unit connected to the first constant current source 101 and the second timing control unit connected to the second constant current source 102 are the same and are the first timing control signal; the timing control signal output by the third timing control unit connected to the third constant current source 103 is the second timing control signal.
Further, the first constant current source 101 and the third constant current source 103 may receive a first timing control signal; the second constant current source 102 receives a second timing control signal, wherein the first timing control signal and the second timing control signal are two control signals with different timings. In this embodiment, the timing control signals output by the first timing control unit connected to the first constant current source 101 and the third timing control unit connected to the third constant current source 103 are the same and are both first timing control signals; the timing control signal output by the second timing control unit connected to the second constant current source 102 is a second timing control signal.
Further, the second constant current source 102 and the third constant current source 103 may receive a first timing control signal; the first constant current source 101 receives a second timing control signal, wherein the first timing control signal and the second timing control signal are two control signals with different timings. In this embodiment, the timing control signals output by the second timing control unit connected to the second constant current source 102 and the third timing control unit connected to the third constant current source 103 are the same and are the first timing control signal; the timing control signal output by the first timing control unit connected to the first constant current source 101 is a second timing control signal.
Alternatively, the timing control signal may include a first timing control signal, a second timing control signal, and a third timing control signal. The first constant current source 101 receives a first timing control signal, the second constant current source 102 receives a second timing control signal, and the third constant current source 103 receives a third timing control signal. The first timing control signal, the second timing control signal and the third timing control signal are three control signals with different timings. In this embodiment, the timing control signal output by the first timing control unit connected to the first constant current source 101 is the first timing control signal, the timing control signal output by the second timing control unit connected to the second constant current source 102 is the second timing control signal, and the timing control signal output by the third timing control unit connected to the third constant current source 103 is the third timing control signal.
The constant current source can receive various possible implementation modes of the timing control signal, and the time for outputting the constant current by different constant current sources can be staggered. The first constant current source 101, the second constant current source 102, and the third constant current source 103 can cause the constant currents output by the different constant current sources to light the LEDs at different gray scales according to the current signals sent by the output current adjusting unit. Therefore, the light emitting time of the LED is staggered by designing the drive, so that the load loaded on the drive chip at the same time is reduced, the RT and FT on the drive output wiring of the drive chip are reduced, the control of the light emitting time under each gray scale is more accurate, the color cast phenomenon under the low gray scale can be reduced, and the color cast compensation effect of the low gray scale is achieved.
On the other hand, the embodiment of the present application further provides a driving method for an LED display device, wherein the LED display device may be the LED display device provided in fig. 1; referring to fig. 2a, fig. 2a is a schematic flow chart of a driving method according to an embodiment of the present disclosure. The driving method includes:
step S201, the first constant current source 101 receives a first timing control signal;
step S202, the first constant current source 101 lights up the LED in the display circuit 20, which is communicated with the first constant current source 101, according to the first timing control signal;
step S203, the second constant current source 102 and/or the third constant current source 103 receives a second timing control signal;
step S204, the second constant current source 102 and/or the third constant current source 103 lights up the LED communicated with the second constant current source 102 and/or the third constant current source 103 in the display circuit 20 according to the second timing control signal; the starting time for lighting the LED in the second time sequence control signal is different from the starting time for lighting the LED in the first time sequence control signal.
Optionally, an embodiment of the present application further provides another driving method for an LED display device, where the LED display device may be the LED display device provided in fig. 1; referring to fig. 2b, fig. 2b is a schematic flow chart of another driving method according to an embodiment of the present disclosure. The driving method includes:
step S205, the first constant current source 101 receives the first timing control signal;
step S206, the first constant current source 101 lights up the LED in the display circuit 20 communicating with the first constant current source 101 according to the first timing control signal;
in step S207, the second constant current source 102 receives the second timing control signal;
in step S208, the second constant current source 102 lights up the LED of the display circuit 20 connected to the second constant current source 102 according to the second timing control signal;
in step S209, the third constant current source 103 receives the third timing control signal;
step S210, the third constant current source 103 lights up the LED in the display circuit 20 connected to the third constant current source 103 according to the third timing control signal; the starting time for lighting the LED in the first time sequence control signal, the starting time for lighting the LED in the second time sequence control signal and the starting time for lighting the LED in the third time sequence control signal are different.
In the above driving method, the first constant current source 101, the second constant current source 102, and the third constant current source 103 may respectively shift the time when the different constant current sources output the constant currents according to the timing control signal sent by the timing control unit, and the first constant current source 101, the second constant current source 102, and the third constant current source 103 may respectively cause the constant currents output by the different constant current sources to light the LEDs in different gray scales according to the current signal sent by the output current adjusting unit. Therefore, the light emitting time of the LED is staggered by designing and driving, so that the load loaded on the driving chip at the same time is reduced, the RT and FT on the driving output wiring of the driving chip are reduced, the control of the light emitting time under each gray scale is more accurate, the color cast phenomenon under the low gray scale can be reduced, and the color cast compensation effect of the low gray scale is achieved.
Referring to fig. 3, fig. 3 is a schematic structural diagram of another LED display device according to an embodiment of the present disclosure, where the device includes, but is not limited to, the following circuits or units:
a driving circuit 10 and a display circuit 20, wherein the driving circuit 10 includes at least three constant current sources including a first constant current source 101, a second constant current source 102, and a third constant current source 103; the display circuit 20 includes a display unit 30 and a scanning unit 40;
the display unit 30 includes at least three row lines, at least three column lines, and at least nine pixel units, each of the at least nine pixel units includes an LED connected to one of the at least three row lines and one of the at least three column lines, and the at least nine pixel units include a first LED (301), a second LED (302), a third LED (303), and a fourth LED (304);
the above-described circuit connection relationship and current flow direction of the driving circuit 10, the scanning unit 40, and the display unit 30 are the same as those of the LED display device provided in fig. 1. Specifically, the output port 113 of the first constant current source 101, the output port 123 of the second constant current source 102, and the output port 133 of the third constant current source 103 in the driving circuit 10 output constant currents, which enter the display unit 30 through the receiving ports 314, 315, and 316 of the display unit, respectively, the scanning unit 40 outputs selection signals through the output ports 411, 412, and 413, which enter the display unit 30 through the receiving ports 311, 312, and 313 of the display unit 30, respectively, and the display unit 30 lights up the LEDs included in the display unit 30 after receiving the constant currents and the selection signals.
The display unit 30 includes nine pixel units, and each pixel unit includes an LED connected to one of at least three row lines and one of at least three column lines, and a first LED (301), a second LED (302), a third LED (303), and a fourth LED (304) are exemplified below. The anode of the first LED (301) is connected to the output port 113 of the first constant current source 101 and the anode of the second LED (302), respectively, the cathode of the first LED (301) is connected to the output port 411 of the scanning unit 40 and the cathode of the third LED (303) respectively, the anode of the second LED (302) is connected to the output port 113 of the first constant current source 101, the cathode of the second LED (302) is connected to the output port 412 of the scanning unit 40 and the cathode of the fourth LED (304) respectively, the anode of the third LED (303) is connected to the output port 133 of the third constant current source 103 and the anode of the fourth LED (304), respectively, the cathode of the third LED (303) is connected to the output port 411 of the scanning unit 40, the anode of the fourth LED (304) is connected to the output port 133 of the third constant current source 103, the cathode of the fourth LED (304) is connected to the output port 412 of the scan cell 40.
In the embodiment of the present application, after the anode of the first LED (301) receives the constant current outputted from the first constant current source 101 and the cathode of the first LED (301) receives the selection signal outputted from the output port 411 of the scanning unit 40, the first LED (301) is lighted, the anode of the second LED (302) receives the constant current outputted by the first constant current source 101, and the cathode of the second LED (302) receives the selection signal outputted by the output port 412 of the scanning unit 40, the second LED (302) is lighted, the anode of the third LED (303) receives the constant current output by the third constant current source 103, and the cathode of the third LED (303) receives the selection signal output by the output port 411 of the scanning unit 40, the third LED (303) is turned on, the anode of the fourth LED (304) receives the constant current outputted from the third constant current source 103, and the cathode of the fourth LED (304) receives the selection signal outputted from the output port 412 of the scanning unit 40, and then the fourth LED (304) is turned on. The first LED (301), the second LED (302), the third LED (303) and the fourth LED (304) are lighted at different time sequences because the constant current source outputs the constant current at different time sequences, and the display effect of the LEDs in the display circuit can be improved.
Referring to fig. 4a, fig. 4a is a schematic structural diagram of another LED display device according to an embodiment of the present disclosure, which includes, but is not limited to, the following circuits or units:
the display device comprises a driving circuit 10, a scanning unit 40 and a display unit 30, wherein the driving circuit 10 comprises six constant current sources which are a first constant current source 101, a second constant current source 102, a third constant current source 103, a fourth constant current source 104, a fifth constant current source 105 and a sixth constant current source 106; the scan cell 40 includes six columns of scan lines S1, S2, S3, S4, S5, and S6; the display unit 30 includes six row lines and six column lines, the six row lines are respectively connected with six driving terminals OUT1, OUT2, OUT3, OUT4, OUT5 and OUT6 of the driving circuit 10, the six column lines are respectively connected with six scanning lines S1, S2, S3, S4, S5 and S6 of the scanning unit 40, a pixel unit in the display unit 30 includes LEDs connected to any one row line and any one column line, and in the display array of six row lines and six column lines in fig. 4a, the pixel unit includes thirty-six LEDs.
The above-described circuit connection relationship of the driving circuit 10, the scanning unit 40, and the display unit 30 and the current flow direction are similar to those of the LED display device provided in fig. 1 and 3. Specifically, the six rows of scanning lines of the scanning unit 40 respectively output a selection signal, and when the selection switch tube of one row of scanning lines (e.g., S1) is turned on, the LED on the scanning line is connected to the high potential end, that is, the LED lamp on the corresponding row line can be controlled to be turned on by the selection switch tube; the output port 113 of the first constant current source 101 in the driving circuit 10 is a driving end OUT1 of the driving circuit, and is connected to the first row line of the display unit 30, the output port 123 of the second constant current source 102 in the driving circuit 10 is a driving end OUT2 of the driving circuit 10, and is connected to the second row line of the display unit 30, the output port 133 of the third constant current source 103 in the driving circuit 10 is a driving end OUT3 of the driving circuit 10, and is connected to the third row line of the display unit 30, the output port 143 of the fourth constant current source 104 in the driving circuit 10 is a driving end OUT4 of the driving circuit 10, and is connected to the fourth row line of the display unit 30, the output port 153 of the fifth constant current source 105 in the driving circuit 10 is a driving end OUT5 of the driving circuit 10, and is a fifth row line of the display unit 30, the output port 163 of the sixth constant current source 106 in the driving circuit 10 is a driving end OUT6 of the driving circuit 10, connected to the sixth row line of the display element 30.
In the embodiment of the present application, the first input ports of the six constant current sources in the driving circuit 10 respectively receive the current signals sent by the output current adjusting unit, specifically, the first input port 111 of the first constant current source 101 and the first input port 141 of the fourth constant current source 104 respectively receive the current signal (VR) for driving the R pixel, and accordingly, the LEDs on the first row line connected to the first constant current source 101 and the LEDs on the fourth row line connected to the fourth constant current source 104 in the display unit 30 are used for lighting the brightness of the R (red) pixel; similarly, the first input port 121 of the second constant current source 102 and the first input port 151 of the fifth constant current source 105 respectively receive a current signal (VG) for driving a G pixel, and accordingly, the LEDs on the second row line connected to the second constant current source 102 and the LEDs on the fifth row line connected to the fifth constant current source 105 in the display unit 30 are used for lighting the brightness of the G (green) pixel; the first input port 131 of the third constant current source 103 and the first input port 161 of the sixth constant current source 106 receive the current signal (VB) for driving the B pixel, and accordingly, the LEDs on the third row line connected to the third constant current source 103 and the LEDs on the sixth row line connected to the sixth constant current source 106 in the display unit 30 are used to light the luminance of the B (blue ) pixel. The output ports of the six constant current sources in the driving circuit 10 are respectively connected to six row lines in the display unit 30 for controlling the LEDs on each row line. In addition, the second input ports of the six constant current sources in the driving circuit 10 respectively receive the timing control signals sent by the timing control unit, specifically, the second input port 112 of the first constant current source 101 receives the first timing control signal OE1, the second input port 122 of the second constant current source 102 receives the second timing control signal OUT2, the second input port 132 of the third constant current source 103 receives the third timing control signal OE3, the second input port 142 of the fourth constant current source 104 receives the fourth timing control signal OE4, the second input port 152 of the fifth constant current source 105 receives the fifth timing control signal OE5, and the second input port 162 of the sixth constant current source 106 receives the sixth timing control signal OE 6; accordingly, the six different timing signals control the six constant current sources to output constant currents at different timings, so that the LEDs on the six row lines in the display unit 30 are lit at different timings. Specifically, besides the above-mentioned ways in which the six constant current sources are respectively connected to six different timing control signals, there may be a plurality of different connection ways. For example, constant current sources (the first constant current source 101 and the fourth constant current source 104) for driving an R (Red ) pixel among the six constant current sources receive the first timing control signal, constant current sources (the second constant current source 102 and the fifth constant current source 105) for driving a G (green ) pixel among the six constant current sources receive the second timing control signal, and constant current sources (the third constant current source 103 and the sixth constant current source 106) for driving a B (blue) pixel among the six constant current sources receive the third timing control signal; the constant current sources adjacent to each other in the six constant current sources may be connected to different timing control signals, the first constant current source 101 is connected to the first timing control signal, the second constant current source 102 is connected to any other timing control signal except the first timing control signal, the timing control signal connected to the third constant current source 103 is different from the timing control signal connected to the second constant current source 102, and so on; it is also possible that constant current sources spaced at least two places apart are connected to different timing control signals. The driving circuit 10 can output constant currents at different timings by connecting different constant current sources to different timing control signals, and the display unit 30 correspondingly receives the constant currents at different timings, so as to light the LEDs included in the display unit 30 and stagger the lighting time of the LEDs. Therefore, the light emitting time of the LED is staggered by designing and driving, so that the load loaded on the driving chip at the same time is reduced, the RT and FT on the driving output wiring of the driving chip are reduced, the control of the light emitting time under each gray scale is more accurate, the color cast phenomenon under the low gray scale can be reduced, and the color cast compensation effect of the low gray scale is achieved. In addition, the driving circuit 10 further receives the gray-scale clock signal GCLK, the digital input signal DI, the overall latch clock signal LAT, and the pixel clock signal DCLK, and outputs the constant currents OUT1 to OUT6 from the constant current source after being processed by the internal module of the driving chip IC.
In addition, since fig. 4a is a schematic structural diagram of a display device of a common cathode PM-Mini LED, an embodiment of the present application further provides a schematic structural diagram of another LED display device, please refer to fig. 4b, and fig. 4b is a schematic structural diagram of a display device of a common anode PM-Mini LED, where the device includes, but is not limited to, the following circuits or units:
the display device comprises a driving circuit 10, a scanning unit 40 and a display unit 30, wherein the driving circuit 10 comprises six constant current sources which are a first constant current source 101, a second constant current source 102, a third constant current source 103, a fourth constant current source 104, a fifth constant current source 105 and a sixth constant current source 106; the scan cell 40 includes six columns of scan lines S1, S2, S3, S4, S5, and S6; the display unit 30 includes six row lines and six column lines, the six row lines are respectively connected with six driving terminals OUT1, OUT2, OUT3, OUT4, OUT5 and OUT6 of the driving circuit 10, the six column lines are respectively connected with six scanning lines S1, S2, S3, S4, S5 and S6 of the scanning unit 40, a pixel unit in the display unit 30 includes LEDs connected to any one row line and any one column line, and in the display array of six row lines and six column lines in fig. 4b, the pixel unit includes thirty-six LEDs.
The circuit connection relationship of the driving circuit 10, the scanning unit 40 and the display unit 30 is different from that of the LED display device provided in fig. 4 a. Specifically, six rows of scanning lines of the scanning unit 40 respectively output the selection signals, the six rows of scanning lines are respectively connected to anodes of the LEDs in the display unit 30, and when the selection switch tube of one row of scanning lines (e.g., S1) is turned on, the anode of the LED on the scanning line is connected to a high potential end, that is, the LED lamp on the corresponding row line can be controlled to be turned on by the selection switch tube; the output port 113 of the first constant current source 101 in the driving circuit 10 is a driving terminal OUT1 of the driving circuit, and is connected to the cathode of the LED on the first line of the display unit 30, the output port 123 of the second constant current source 102 in the driving circuit 10 is a driving terminal OUT2 of the driving circuit 10, and is connected to the cathode of the LED on the second line of the display unit 30, the output port 133 of the third constant current source 103 in the driving circuit 10 is a driving terminal OUT3 of the driving circuit 10, and is connected to the cathode of the LED on the third line of the display unit 30, the output port 143 of the fourth constant current source 104 in the driving circuit 10 is a driving terminal OUT4 of the driving circuit 10, and is connected to the cathode of the LED on the fourth line of the display unit 30, the output port 153 of the fifth constant current source 105 in the driving circuit 10 is a driving terminal 5 of the driving circuit 10, and is a cathode of the LED on the fifth line of the display unit 30, the output port 163 of the sixth constant current source 106 in the driving circuit 10 is an OUT driving terminal 6 of, connected to the cathodes of the LEDs on the sixth row of display cells 30. In addition, the functional modules in the LED display device provided in fig. 4b are similar to those in fig. 4a, and therefore are not described herein again. On the other hand, the embodiment of the present application further provides a driving method for an LED display device, wherein the LED display device may be any one of the LED display devices provided in fig. 1, fig. 3, fig. 4a, and fig. 4 b; the driving method includes:
the LED display device generates gray scale data according to an LED display image in the display circuit, wherein the gray scale data is the luminance, the chromaticity and the lighting time of the LED under different gray scales, so that a pulse width modulation signal can be generated according to the gray scale data, a constant current source in the driving circuit can modulate the voltage in the display circuit into a target voltage in a first time period of the pulse width modulation signal, and the target voltage is the working voltage of the LED lamp, so that the control of the lighting time under each gray scale is more accurate; the pulse width modulation signal can be used for adjusting gray scale, the gray scale is determined by the length of the light emitting time of the LED lamp, so that a time sequence control signal can be generated according to the pulse width modulation signal, the constant current source in the driving circuit can stagger the time for different constant current sources to output constant currents according to the time sequence control signal sent by the time sequence control unit in the second time period, the LED in the display circuit is lightened to generate brightness corresponding to gray scale data, RT and FT on the driving output wiring of the driving chip can be reduced, the light emitting time under each gray scale can be controlled more accurately, the color cast phenomenon under the low gray scale can be relieved, and the color cast compensation effect of the low gray scale can be achieved.
Referring to fig. 5, fig. 5 is a schematic diagram illustrating an effect of a conventional pwm signal to adjust gray scales, as shown in fig. 5, a first line represents a period of a gray scale clock GCLK adjusted by the pwm signal, the pwm signal can be used to adjust gray scales, and the gray scales are determined by a length of a light emitting time of the LED lamp, for example, a light emitting time of a minimum gray scale 1 is a half period of the gray scale clock GCLK, a light emitting time of a gray scale 2 is a half period of the gray scale clock GCLK, a gray scale 3 is a half period of the gray scale clock GCLK, and so on.
Referring to fig. 6, fig. 6 is a schematic diagram illustrating an output timing of a conventional driving signal. Taking the above fig. 4a as an example, when the entire row of LED lamp panels of the display unit 30 in the LED display device provided in fig. 4a displays a certain gray-scale image, fig. 6 is a schematic diagram of the display driving timing sequence thereof, as shown in fig. 6, first, the first row scanning line S1 of the scanning unit 30 is turned on, then the driving terminals out1 to out6 of the driving circuit 10 are turned on, a high level is output, and the first row of LEDs of the display unit 30 emit light; then the second column scanning line S2 of the scanning unit is turned on, and then the out1 to out6 driving terminals of the driving circuit 10 are turned on to output a high level, and the second column LEDs in the display unit 30 emit light; by analogy, the sequential refresh display of the 6 × 6 matrix display unit 30 is completed through six scans. Since the light emission gray scale of each LED is the same, the turn-on time and the end time of the driving terminals out1 to out6 of the driving circuit 10 are also the same, i.e., the driving chip (Driver IC) needs to simultaneously drive an entire column of LEDs to emit light, resulting in large currents RT and FT at the start and end times of the light emission period in each column scan time of the Driver IC.
For the problem of large currents RT and FT in fig. 6, fig. 7 provides a corresponding solution, please refer to fig. 7, and fig. 7 is a schematic diagram of an output timing sequence of a driving signal according to an embodiment of the present application. Also taking the above fig. 4a as an example for explanation, when the entire row of LED lamp panels of the display circuit in the LED display device provided in fig. 4a displays a certain gray-scale image, fig. 7 is a schematic display driving timing diagram thereof, and as shown in fig. 7, the driving light-emitting start times t1-t6 of each row in the display unit 30 are staggered, that is, the turn-on times of the driving terminals out1-out6 are different, so that each time out1-out6 is turned on, the load of the driving Driver IC is only the 1/6 that is turned on at the same time by out1-out6, and therefore, the currents RT and FT on the wirings of out1-out6 are significantly reduced.
Specifically, referring to fig. 8, a comparison of current changes when driving on and off is shown, and fig. 8 is a schematic diagram of a comparison of driving signals provided by the embodiment of the present application. As shown in fig. 8, the first driving current I is the conventional driving current of fig. 6, and the second driving current I is the driving current of fig. 7 designed according to the embodiment of the present application. According to the two driving current change curves, the driving current change curves RT and FT of the driving mode designed in the figure 7 are small, so that the current curve is closer to a theoretical value, the relative display error is small, and the display of all gray scales can be controlled more accurately. Especially for the low gray scale display, the on-current time for driving the light emission is shorter, and the RT and FT of the current change have larger influence on the display brightness and chromaticity, so the second driving design can make the low gray scale display effect better, can greatly reduce the color cast problem of the low gray scale display, and has the color cast compensation effect of the low gray scale.
At present, a conventional constant current driving architecture is that a Driver IC receives signals such as GCLK/DI/LAT/DCLK/VR/VG/VB and outputs driving signals for controlling display under the control of a same timing control signal OE, and the driving signals output by the constant current driving architecture cause an excessive load loaded on the Driver IC at the same time, so that RT and FT values on a driving output trace of the Driver IC are high.
For the above-mentioned problems existing in the conventional constant current driving architecture, fig. 9 provides a corresponding solution, please refer to fig. 9, and fig. 9 is a schematic diagram of a constant current driving architecture according to an embodiment of the present application. As shown in fig. 9, each constant current source inside the driving end is controlled by an individual and different OE timing control signal, so as to turn on each out output at different time, stagger the light emitting time of the LED lamp, reduce the load loaded on the driving chip at the same time, reduce the RT and FT values on the driving output trace of the Driver IC, control the light emitting time under each gray scale more accurately, and greatly reduce the color cast under the low gray scale, thereby achieving a certain compensation effect.
Referring to fig. 10, fig. 10 is a timing diagram of a timing control signal according to an embodiment of the present application, as shown in fig. 10, each constant current source, which is the driving side, is controlled by an individual and mutually different OE timing control signal, respectively, to achieve turning on each out output at different times, wherein, the time of the constant current source receiving the OE1-OE6 timing control signals are mutually staggered, correspondingly, the opening time and the ending time of the output ends out1-out6 of the constant current source are also mutually staggered, therefore, each out output can be turned on at different time, the light emitting time of the LED lamp is staggered, the load loaded on the driving chip at the same time is reduced, the RT and FT values on the Driver IC drive output wiring are reduced, so that the control of the light emitting time under each gray scale is more accurate, the color cast phenomenon under the low gray scale can be greatly reduced, and a certain compensation effect is achieved.
Through the embodiment of the application, the light emitting time of the LED can be staggered, so that the load loaded on a Driver IC (Driver IC) at the same time is reduced, the RT and FT of the Driver IC on the driving output wiring are reduced, the light emitting time under each gray scale is controlled more accurately, the color cast phenomenon under the low gray scale can be reduced, and the color cast compensation effect of the low gray scale is achieved.
It should be noted that the LED in this application may be a mini LED, a Micro LED, or an OLED. Here, the number of the carbon atoms is not particularly limited.
It should be understood that the application of the present application is not limited to the above examples, and that modifications or changes may be made by those skilled in the art based on the above description, and all such modifications and changes are intended to fall within the scope of the appended claims.
Claims (10)
1. An LED display device, comprising:
the display device comprises a driving circuit and a display circuit, wherein the driving circuit comprises at least three constant current sources, and the at least three constant current sources comprise a first constant current source, a second constant current source and a third constant current source;
the output port of the first constant current source, the output port of the second constant current source and the output port of the third constant current source are respectively connected with the input port of the display circuit, at least two constant current sources of the first constant current source, the second constant current source and the third constant current source receive different time sequence control signals, and the time sequence control signals are used for controlling the constant current output time sequences of the first constant current source, the second constant current source and the third constant current source;
the first constant current source, the second constant current source and the third constant current source are used for outputting constant currents to the display circuit at different time sequences according to the time sequence control signals, and the display circuit is used for lighting LEDs contained in the display circuit according to the constant currents.
2. The LED display device of claim 1, wherein the timing control signal comprises a first timing control signal, a second timing control signal; the first time sequence control signal and the second time sequence control signal are two control signals with different time sequences;
wherein at least two of the first, second, and third constant current sources receive the first timing control signal;
the constant current source other than the constant current source receiving the first timing control signal receives the second timing control signal.
3. The LED display device of claim 2,
the first constant current source and the second constant current source receive the first timing control signal;
the third constant current source receives the second timing control signal.
4. The LED display device of claim 2,
the first constant current source and the third constant current source receive the first timing control signal;
the second constant current source receives the second timing control signal.
5. The LED display device of claim 2,
the second constant current source and the third constant current source receive the first timing control signal;
the first constant current source receives the second timing control signal.
6. The LED display device of claim 1, wherein the timing control signal comprises a first timing control signal, a second timing control signal, a third timing control signal;
the first constant current source receives the first timing control signal;
the second constant current source receives the second timing control signal;
the third constant current source receives the third timing control signal; the first timing control signal, the second timing control signal and the third timing control signal are control signals of three different timings.
7. The LED display device according to any one of claims 1 to 6, wherein the display circuit comprises:
a display unit and a scanning unit; wherein the display unit includes at least three row lines, at least three column lines, and an LED connected to one of the at least three row lines and one of the at least three column lines;
the scanning unit is connected with the at least three column lines;
the at least three row lines of the display unit are respectively connected with an output port of the first constant current source, an output port of the second constant current source and an output port of the third constant current source;
the display unit is used for lighting the LEDs contained in the display unit at different time sequences after receiving the constant currents output by the first constant current source, the second constant current source and the third constant current source and the selection signal output by the scanning unit.
8. The LED display device of claim 7, wherein the display unit comprises at least one of a Micro LED and a Mini LED.
9. A driving method, characterized by comprising:
the first constant current source receives a first timing control signal and lights an LED (light emitting diode) which is communicated with the first constant current source in the display circuit according to the first timing control signal;
the second constant current source and/or the third constant current source receive a second time sequence control signal and light an LED (light emitting diode) which is communicated with the second constant current source and/or the third constant current source in the display circuit according to the second time sequence control signal; wherein a start time for lighting the LED in the second timing control signal is different from a start time for lighting the LED in the first timing control signal.
10. The driving method according to claim 9, further comprising:
the second constant current source receives the second time sequence control signal and lights an LED which is communicated with the second constant current source in the display circuit according to the second time sequence control signal;
the third constant current source receives a third time sequence control signal and lights an LED (light emitting diode) which is communicated with the third constant current source in the display circuit according to the third time sequence control signal; wherein the start time for lighting the LED in the first timing control signal, the start time for lighting the LED in the second timing control signal, and the start time for lighting the LED in the third timing control signal are all different.
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