CN107749271A - Drive circuit and driving method for LED display - Google Patents
Drive circuit and driving method for LED display Download PDFInfo
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- CN107749271A CN107749271A CN201711035368.1A CN201711035368A CN107749271A CN 107749271 A CN107749271 A CN 107749271A CN 201711035368 A CN201711035368 A CN 201711035368A CN 107749271 A CN107749271 A CN 107749271A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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Abstract
The application provides a kind of drive circuit and driving method of LED display, including row drive module and row drive module, row drive module include：Multiple inputs, multiple inputs are used to receive display data, at least one to be re-used to receive configuration adjustment signal；First decoder, multiple inputs are connected to, for entering row decoding to the display data received via multiple inputs to generate horizontal-drive signal；Second decoder, at least one input being connected in multiple inputs, whether the signal for judging to receive via at least one input in multiple inputs is configuration adjustment signal, and adjusts signal generation configuration information according to configuration；And register, for storage configuration information.The input of this method multiplexing row drive module signal and configures to receive configuration adjustment to row drive module, can reach the purpose for the running parameter that row drive module is adjusted according to actual environment, while do not interfere with the display effect of image.
Description
Technical field
The present invention relates to display technology field, more particularly, to a kind of drive circuit for LED display and drive
Dynamic method.
Background technology
The pixel element of LED display is light emitting diode (LED).LED display has the superior of following aspect
Property：High gray, wide visible angle, abundant color and customizable screen shape.Therefore, light-emitting diode display is widely used
In every field such as industry, traffic, commercial advertisement, information issue, sports tournaments.
The difference in performance due to reasons such as technique, materials, between different display screens more or less be present, and it is applied
Environment, if carrying out different display screens using identical drive circuit, may be caused in display effect there is also difference
Difference.If be driven using different drive circuits, manufacturing cost may be caused too high.
The content of the invention
In view of this, the embodiment of the present invention provides a kind of drive circuit applied to display device, including row drive module
With row drive module, it is expert in drive module, is received using the idle period of display data and processing configuration adjusts signal so that
Configuration is adjustable inside row drive module, to adapt to various application environments.
According to the first aspect of the invention, there is provided a kind of drive circuit for LED display, including row drive module
With row drive module, wherein, the row drive module includes：
Multiple inputs, the multiple input is used to receive display data, at least one in the multiple input
It is re-used to receive configuration adjustment signal；
First decoder, the multiple input is connected to, for the display data to being received via multiple inputs
Enter row decoding to generate horizontal-drive signal；
Second decoder, at least one input being connected in the multiple input, for judging via institute
State whether the signal that at least one input in multiple inputs receives is configuration adjustment signal, and according to described
Configuration adjustment signal generation configuration information, the configuration information are used for the running parameter for configuring the row drive module；And
Register, for storing the configuration information.
Preferably, second decoder is additionally operable to when it is determined that the signal adjusts signal for configuration, export enabled letter
Number；
The drive circuit also includes：Latch signal generation module, control is latched for being generated according to the enable signal
Signal；
The register is additionally operable to latch configuration information according to the latch control signal.
Preferably, second decoder inputs via the first input end in the multiple input and second respectively
End receives first detection signal and the second detection signal, and calculates described the within the effective time of the first detection signal
The rising edge or the number of trailing edge that two detection signals include, when the number of rising edge or trailing edge meets default condition,
The configuration information is generated according to the number of the rising edge or trailing edge.
Preferably, the first input end and the second input are designed for different signal toggle frequencies, wherein being directed to
The signal toggle frequency of the first input end is less than the signal toggle frequency for second input.
Preferably, the default condition includes：Second detection within the effective time of the first detection signal
The rising edge or trailing edge number that signal includes are more than or equal to 8.
According to the second aspect of the invention, a kind of driving method for LED display, using row drive module
Enter every trade driving and enter Drive of row and column using row drive module, the utilization row drive module, which enters every trade driving, to be included：
Display data, and at least one be multiplexed in the multiple input are received via multiple inputs of row drive module
It is individual to be re-used to receive configuration adjustment signal；
The display data received to multiple inputs via row drive module enters row decoding to generate capable driving
Signal, and when the signal received via at least one input in the multiple input is configuration adjustment signal
When, row decoding is entered to the configuration adjustment signal to generate configuration information, and by configuration information storage in a register.
Preferably, in addition to：When it is determined that the signal adjusts signal for configuration, generation latch control signal is supplied to institute
Register is stated, the register root latches configuration information according to the latch control signal.
Preferably, the first detection is received via the first input end in the multiple input and the second input respectively to believe
Number and the second detection signal, and calculate second detection signal within the effective time of the first detection signal and include
The number of rising edge or trailing edge, when the number of rising edge or trailing edge meets default condition, according to the rising edge or
The number of trailing edge generates the configuration information.
Preferably, the first input end and the second input are designed for different signal toggle frequencies, wherein being directed to
The signal toggle frequency of the first input end is less than the signal toggle frequency for second input.
Preferably, the default condition includes：Second detection within the effective time of the first detection signal
The rising edge or trailing edge number that signal includes are more than or equal to 8.
Row drive module in the embodiment of the present invention, at least one input of the row drive module is multiplexed, to described
Whether the signal that at least one input receives is judged, be configuration adjustment signal to distinguish, and the configuration is adjusted
Decoding obtains configuration information storage into register in signal, by configuration information guarantee row drive module under circumstances
Display effect.Because configuration adjustment signal inputs in the idle period of interframe, thus the display effect of two field picture is not interfered with
Fruit.
Further, the rising edge or trailing edge number in the signal received are calculated by counting circuit, according to rising
Edge or trailing edge number determine whether configuration adjustment signal.Realizing for counting circuit is relatively simple, and cost is relatively low, has larger
Practical value.
Brief description of the drawings
By referring to description of the following drawings to the embodiment of the present invention, above-mentioned and other purpose of the invention, feature and
Advantage will be apparent from, in the accompanying drawings：
Fig. 1 is the structural representation according to the LED display of the embodiment of the present invention.
Fig. 2 is the structural representation according to the row drive module of the embodiment of the present invention.
Fig. 3 is the timing diagram of the configuration adjustment signal of row drive module according to embodiments of the present invention.
Fig. 4 is the flow chart of the driving method of LED display according to embodiments of the present invention.
Embodiment
The present invention is more fully described hereinafter with reference to accompanying drawing.In various figures, identical element is using similar attached
Icon is remembered to represent.For the sake of clarity, the various pieces in accompanying drawing are not necessarily to scale.Furthermore, it is possible to it is not shown some
Known part.
Embodiment of the disclosure, which proposes to be expert in drive module, increases configuration feature, is utilized by being expert in drive module
The idle period of display data receives and processing configuration adjustment signal so that configuration is adjustable inside row drive module, makes to go driving
Module can adapt to the various applications under varying environment, for example, the change of supply voltage, lamp bead VF value deviations are larger etc..
In the application, lamp bead VF values represent forward voltage values.
Fig. 1 is the structural representation according to the LED display of the embodiment of the present disclosure.With reference to figure 1, LED display 100
Including row drive module 110, row drive module 120 and LED panel 130.
LED panel 130 includes being arranged to multiple LED display units 131 of array.LED display unit 131 in array
Anode is drawn via line Row1 to Row8, and negative electrode is drawn via alignment Col1 to Col8.
Row drive module 110 includes multiple input A0-A2, Enable Pin E1-E2N and multiple output end OUT0-OUT7.It is defeated
Enter to hold A0, A1 and A2 to be used to receive display data, Enable Pin E1 and E2N for receiving enable signal, output end OUT0 to OUT7
Line Row1 to Row8 is connected respectively to provide it horizontal-drive signal.In the present embodiment, input A0, A1 and A2 is used
In receiving the signal with different toggle frequencies, the signal toggle frequency wherein on input A0 is less than input A1, and defeated
Enter and hold the signal toggle frequency on A1 to be less than input A2.Generally, the signal toggle frequency on input A1 is input
Twice of A0, and the signal toggle frequency on input A2 is twice of A1.Row drive module 110 is to via input A0, A1
Enter row decoding with the display data that A2 is received to generate horizontal-drive signal, and row driving is believed via output end OUT0 to OUT7
Number it is respectively supplied to line Row1 to Row8.Multiple output end OUT0 to OUTN of row drive module 120 respectively with a plurality of alignment
Col1-ColN is connected, wherein, N is natural number.Row drive module 120 can be realized by constant current source chip, including multiple constant currents
Source, it is connected respectively with a plurality of alignment, the opening time of constant-current source is controlled according to luma data.
In a frame period, row drive module 110 receives the display data of input by input A0-A2, by interior
The decoder processing in portion, exports horizontal-drive signal to control every a line LED display unit 131 in output end OUT1-OUT7 respectively
Light.Correspondingly, row driver 120 modulates (PWM) signal according to display data in output end OUT0-OUTN output pulse widths,
By controlling the dutycycle of pwm signal, so as to change effective lighting time of LED display unit, so as to adjust LED display unit
Brightness, realize the display of image corresponding line data.
It should be noted that although Fig. 1 is described by taking the LED array of display that 8 row * N are arranged as an example, the disclosure is not limited to
This, above-mentioned LED panel 130 can include the LED array of display of any rows and columns.
Fig. 2 is the structural representation according to the row drive module 110 of the embodiment of the present invention.As shown in Fig. 2, row driving mould
Block 110 includes input A0, A1 and A2, and the first decoder 201, register 202, latch signal generation module 203 and second are translated
Code device 204.
First decoder 201 is connected to input A0, A1 and A2, and display data is received via input A0, A1 and A2,
Enter row decoding to display data to generate horizontal-drive signal, and horizontal-drive signal is exported in output end OUT0 to OUT7.
Second decoder 204 is connected to input A0, A1, enters via input A0 and A1 reception signal, and to the signal
Row judges that, when it is not configuration adjustment signal to judge the signal, the second decoder 204 does not make any processing；When judging the signal
Signal is adjusted for configuration, enable signal LAT_EN is to latch signal generation module 203 for output, meanwhile, configuration adjustment signal is translated
Code is to generate configuration information, and the configuration information is exported to register 202.
Latch signal generation module 203 be enabled signal LAT_EN it is enabled after, generate latch control signal LAT_LCK, and
Latch control signal LAT_LCK is output to register 202.
Register 202 latches configuration information in a register according to latch control signal LAT_LCK.Configuration information stores
In a register, the operational blocks which partition system in row drive module can obtain the configuration information from register 202, and according to this
Configuration information sets corresponding running parameter.Such as work can be obtained according to the mapping table search of configuration information and running parameter
Parameter, worked so as to realize under corresponding running parameter.Or mould is set comprising an independent configuration in row drive module
Block, for setting the running parameter of row drive module or being called for other modules.
In the present embodiment, the signal that the second decoder 204 receives via input A0 and A1 can include via input
The end A0 first detection signals received and the second detection signal received via input A1, the second decoder 204 calculate
The rising edge or the number of trailing edge that the second detection signal includes within the effective time of first detection signal, according to rising edge or
The number of trailing edge determines whether configuration adjustment signal, if configuration adjustment signal, then according to the rising edge or decline
Edge number generation configuration information store into register 202, while generate enable signal LAT_EN export give latch signal life
Into module 203.Second decoder 204 can utilize counting circuit to realize that counting circuit is significantly simpler to implement, its manufacturing cost
It is relatively low.Certain embodiment of the disclosure not limited to this.For example, in some embodiments, it is also possible to given birth to not comprising latch signal
Into module 203.For another example the second decoder 204 can via in input (A0, A1 and A2 as depicted) it is any extremely
A few input reception signal, naturally it is also possible to from other source reception signals.
It will be understood to those skilled in the art that in the row drive module provided in the embodiment of the present invention, within the frame period,
First decoder and the second decoder can receive display data, and the second decoder is judging it is not configuration adjustment signal
Afterwards, the display data will not be handled, thus, the configuration information in register will not be changed, and between the frame period
Idle period, the first decoder and the second decoder also can receive configuration adjustment signal, and the first decoder may be by
Some influences of configuration adjustment signal, for example, signal jitter etc., but due to the idle period that it was between the frame period, institute
Do not influenceed with the display effect on two field picture.Certain embodiment of the disclosure not limited to this, those skilled in the art can also
Input configuration adjustment signal between cycle as needed of being expert at.In a word, the present invention utilizes the idle period between such as frame period
Or the configuration adjustment signal of the idle period such as idle period input in the ranks, to adjust the running parameter of row drive module, further, it is possible to
Ensure that configuration feature does not interfere with display function.
Fig. 3 is signal timing diagram according to embodiments of the present invention.With reference to figure 3, S0, S1 and S2 represent from input respectively
The signal that A0, A1 and A2 are received, moment Tf1start and Tf1end represent the starting in the first frame period of display data respectively
And finish time, Tf2start represent to carve at the beginning of the second frame period.During the first frame period, input A0, A1 and A2
Input display data Data.After the first frame period terminated, before the second frame period did not started, idle period be present.At this
Idle period, input A0 and A1 input configuration adjustment signal, and then row drive module is adjusted signal according to the configuration
Adjust running parameter.
Configuration adjustment signal includes the first detection signal from input A0 inputs and the second detection of input A1 inputs
Signal, first detection signal define effective time (as shown in the figure by initial time Tscan-start and finish time Tscan-
End is limited), the effective time was included in interframe blank screen time or between-line spacing time.Within the effective time, the second decoder
It (is in the example of fig. 33 to calculate the number for the rising edge that the second detection signal includes within the effective time of first detection signal
It is individual), and be saved according to the number of rising edge to generate configuration information in register 202.
In this example, first detection signal represents effective time with high level, and according to the rising of the second detection signal
The number generation configuration information on edge.But embodiment of the disclosure not limited to this, as needed other modes can be selected to realize
Configuration adjustment signal and its decoding.For example, can be according to the second detection signal trailing edge in effective time of first detection signal
Number generation configuration information.First detection signal is received via the relatively low input A0 of signal toggle frequency in the present embodiment,
And receive the second detection signal via the higher input A1 of signal toggle frequency, be more beneficial for realizing toggle frequency it is relatively low the
The reception of one detection signal and higher the second detection signal of toggle frequency.
Form 1 is the corresponding relation between rising edge number and configuration information.Wherein, register memory storage tetrad
The configuration information of position, its number range is 0000-1111.Wherein, 0000 expression A0 high level includes A1 rising edge number
For 8,0001 represents that the rising edge number that A0 high level includes A1 is 9, by that analogy.So as to pass through tetrad position
16 kinds of configurations are represented, each configuration can correspond to one or a different set of running parameter.
Table 1
In the present embodiment, in order to avoid obscuring display data and configuration adjustment signal, can by first detection signal and
The upset number that second detection signal is arranged to the second detection signal within the effective time of first detection signal is more than or equal to 2,
Preferably, can be set greater than being equal to 8 as shown in table 1.
Fig. 4 shows the flow chart of the driving method of LED display according to embodiments of the present invention.The driving method bag
Include and enter every trade driving using row drive module and enter Drive of row and column using row drive module.In the present embodiment, the driving method
It can be performed by the drive circuit described above including row drive module 110 and row drive module 120.With reference to figure 4, profit
Enter every trade driving with row drive module to comprise the following steps.
In step S401, display data is received via multiple inputs of row drive module, and be multiplexed the multiple defeated
At least one be re-used entered in end adjusts signal to receive configuration.
In step S402, display data is received via multiple inputs of row drive module, and be multiplexed the multiple defeated
At least one be re-used entered in end adjusts signal to receive configuration.
In step S403, judge whether the signal that one input receives is configuration adjustment signal, if sentenced
Disconnected result is yes, performs step 404, does not otherwise handle.Judgment mode includes：Such as can be by identifying the signal received
Specific identifier (such as frame origin identification or end of identification) determines whether display data, or, by identifying the letter received
Number whether it is signal specific.In the aforementioned embodiment, then the rising included in the effective time by judging first detection signal
Edge or trailing edge number determine whether to adjust signal for configuration.
In step s 404, row decoding generation configuration information is entered to configuration adjustment signal.For example, in previous embodiment, warp
First detection signal is received by input A0, the second detection signal is received via input A1, calculates in first detection signal
The number for the rising edge that second detection signal includes in effective time, and configuration information, example are generated according to the number of rising edge
Configuration information such as can be generated according to upper table 1.And then various running parameters can be configured according to configuration information.
Drive circuit and driving method provided in an embodiment of the present invention, are received by being multiplexed the input of row drive module
Configuration adjustment signal configures to row drive module, can reach the running parameter that row drive module is adjusted according to actual environment
Purpose, the configuration of row drive module is on the other hand performed by using the idle period of display data, figure can be shown
Show that the configuration timesharing with row drive module performs, it is ensured that image display function and configuration feature do not disturb respectively.
Further, two inputs for being multiplexed row drive module receive two paths of signals as configuration adjustment signal, utilize
Wherein the upset number of another way signal carries configuration information in the effective time of signal all the way, enabling with as simple as possible
Single circuit structure realizes the transmission and decoding of configuration information, and implementation is simple and cost is low.
Although the embodiment of the present invention is disclosed as above with preferred embodiment, its be not for limiting claim, it is any
Those skilled in the art without departing from the spirit and scope of the present invention, can make possible variation and modification, therefore this
The protection domain of invention should be defined by the scope that the claims in the present invention are defined.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for those skilled in the art
For, the present invention can have various changes and change.All any modifications made within spirit and principles of the present invention, it is equal
Replace, improve etc., it should be included in the scope of the protection.
Claims (10)
1. a kind of drive circuit for LED display, including row drive module and row drive module, wherein, the row drives
Dynamic model block includes：
Multiple inputs, the multiple input are used to receive display data, and at least one in the multiple input is answered
For receiving configuration adjustment signal；
First decoder, the multiple input is connected to, for being carried out to the display data received via multiple inputs
Decode to generate horizontal-drive signal；
Second decoder, at least one input being connected in the multiple input, for judging via described more
Whether the signal that at least one input in individual input receives is configuration adjustment signal, and according to the configuration
Signal generation configuration information is adjusted, the configuration information is used for the running parameter for configuring the row drive module；And
Register, for storing the configuration information.
2. drive circuit according to claim 1, wherein, second decoder be additionally operable to when determine the signal be with
When putting adjustment signal, enable signal is exported；
The drive circuit also includes：Latch signal generation module, for generating latch control signal according to the enable signal；
The register is additionally operable to latch configuration information according to the latch control signal.
3. drive circuit according to claim 1, wherein, second decoder is respectively via in the multiple input
First input end and the second input receive first detection signal and the second detection signal, and calculate in the described first detection
The rising edge or the number of trailing edge that second detection signal includes in the effective time of signal, when rising edge or trailing edge
When number meets default condition, the configuration information is generated according to the number of the rising edge or trailing edge.
4. drive circuit according to claim 3, wherein, the first input end and the second input are designed for difference
Signal toggle frequency, wherein for the first input end signal toggle frequency be less than for second input letter
Number toggle frequency.
5. drive circuit according to claim 4, wherein, the default condition includes：In the first detection signal
Effective time in the rising edge that includes of second detection signal or trailing edge number be more than or equal to 8.
6. a kind of driving method for LED display, enter every trade driving using row drive module and driven using row
Dynamic model block enters Drive of row and column, and the utilization row drive module, which enters every trade driving, to be included：
Display data is received via multiple inputs of row drive module, and is multiplexed at least one quilt in the multiple input
Multiplexing adjusts signal to receive configuration；
The display data received to multiple inputs via row drive module enters row decoding to generate horizontal-drive signal,
It is and right when the signal that at least one input in via the multiple input receives adjusts signal for configuration
The configuration adjustment signal enters row decoding to generate configuration information, and by configuration information storage in a register.
7. driving method according to claim 1, in addition to：When it is determined that the signal adjusts signal for configuration, generation
Latch control signal is supplied to the register, and the register root latches configuration information according to the latch control signal.
8. driving method according to claim 7, wherein, respectively via the first input end in the multiple input and
Second input receives first detection signal and the second detection signal, and calculates the effective time in the first detection signal
The rising edge or the number of trailing edge that interior second detection signal includes, when the number of rising edge or trailing edge meet it is default
During condition, the configuration information is generated according to the number of the rising edge or trailing edge.
9. driving method according to claim 8, wherein, the first input end and the second input are designed for difference
Signal toggle frequency, wherein for the first input end signal toggle frequency be less than for second input letter
Number toggle frequency.
10. driving method according to claim 8, wherein, the default condition includes：In the first detection signal
Effective time in the rising edge that includes of second detection signal or trailing edge number be more than or equal to 8.
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| CN109637415A (en) * | 2018-12-29 | 2019-04-16 | 武汉华星光电技术有限公司 | Scanning signal generation method, device and electronic equipment |
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| CN207352942U (en) * | 2017-10-30 | 2018-05-11 | 合肥集创微电子科技有限公司 | Drive circuit for LED display |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109637415A (en) * | 2018-12-29 | 2019-04-16 | 武汉华星光电技术有限公司 | Scanning signal generation method, device and electronic equipment |
| WO2020133740A1 (en) * | 2018-12-29 | 2020-07-02 | 武汉华星光电技术有限公司 | Method and device for generating scan signals |
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