CN109559676A - LED display driver circuit and LED display - Google Patents
LED display driver circuit and LED display Download PDFInfo
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- CN109559676A CN109559676A CN201811553169.4A CN201811553169A CN109559676A CN 109559676 A CN109559676 A CN 109559676A CN 201811553169 A CN201811553169 A CN 201811553169A CN 109559676 A CN109559676 A CN 109559676A
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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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- Theoretical Computer Science (AREA)
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Abstract
The present invention relates to a kind of LED display driver circuit and LED display, in LED display driver circuit, row drive array, LED lamp bead, constant-current driven module are connected in series, and are electrically connected to a power source；Row drive array includes several row of channels, one row of channels is electrically connected with the first end of a LED lamp bead at least one pixel, constant-current driven module includes several constant flow channels, and a constant flow channel is electrically connected with the second end of all LED lamp beads at least one pixel；When needing to drive a pixel job, the unlatching of the row of channels of each LED lamp bead connection in row drive array Time-sharing control pixel；Constant-current driven module generates corresponding constant current driving signal according to display data, and the LED lamp bead controlled in pixel shines.Thinking based on time-sharing multiplex drives multiple LED lamp beads in pixel successively to work, reduces constant flow channel quantity, simplifies circuit design, more energy saving, promotes display effect.
Description
Technical field
The present invention relates to LED display field, especially a kind of LED display driver circuit and LED display.
Background technique
LED display brightness, in terms of have good display effect, in control centre, stage, exhibitions, public affairs
Extensive use has been waited until in the scenes such as place, outdoor advertising altogether.With advances in technology and the upgrading of user demand, LED
Display screen just develops towards the direction of the high-resolution such as high density, small spacing and high brightness.
In general, on LED display, the general array arrangement of LED lamp bead, every 3 red, green, blue led lamp bead composition
One pixel, the arrangement of all pixels lattice array.In existing LED display drive scheme, generally by the way of turntable driving,
Including row drive module and column drive module --- row control signal is provided by row drive module, controls the gating of certain a line；By
Column drive module provides electric current, controls shining for LED lamp bead.
Fig. 1 is to indicate which show the driving circuits of a pixel to illustrate knot to simplifying for existing turntable driving scheme
Structure, pixel 20 ' includes red LED lamp bead (R), green LED lamp bead (G) and blue led lamp bead (B), using the company of common anode
Connect form.In row drive module, row control signal function gates the row, the red LED lamp in each pixel in metal-oxide-semiconductor 10 '
Pearl (R), green LED lamp bead (G) and blue led lamp bead (B) are controlled the control of signal by the same row；Column drive module packet
Several driving units 30 ' are included, red LED lamp bead (R), green LED lamp bead (G) and blue led lamp bead (B) are separately connected difference
Driving unit 30 '.Driving unit 30 ' generates the constant current signal of duty ratio corresponding according to display data, controls red LED lamp
Pearl (R), green LED lamp bead (G) and blue led lamp bead (B) shine.
As the spacing of LED display is smaller and smaller, the quantity of LED lamp bead is more and more, while the brightness of LED lamp bead
It is higher and higher.And driving the size of current of these LED lamp beads smaller and smaller, required precision is higher and higher.Thus cause, at small
Away from LED display in, using existing driving structure, driving circuit becomes increasingly complex, and substantially increases design difficulty.
Summary of the invention
Based on this, it is necessary to which when being suitable for small space distance LED display screen for existing driving circuit structure, it is multiple that there are circuits
Problem miscellaneous, design difficulty is high proposes a kind of new LED display driver circuit and LED display.
One embodiment of the invention provides a kind of LED display driver circuit, for driving the LED battle array of pixel array arrangement
Column, each pixel include at least two LED lamp beads, and the LED display driver circuit includes row drive array, constant current driving mould
Block, power supply, the row drive array, LED lamp bead, constant-current driven module be connected in series, and with the power electric connection；
The row drive array includes several row of channels, and one in a row of channels and at least one described pixel
The first end of a LED lamp bead is electrically connected, and the constant-current driven module includes several constant flow channels, a constant flow channel with extremely
The second end electrical connection of all LED lamp beads in a few pixel；
It is every in pixel described in the row drive array Time-sharing control when needing to drive a pixel job
The unlatching of the row of channels of a LED lamp bead connection；The constant-current driven module generates corresponding constant current and drives according to display data
Dynamic signal, the LED lamp bead controlled in the pixel shine.
In some embodiments, the row drive array, including row drive control unit and row pipe array, wherein
The row drive control unit is for generating row control signal；
The row pipe array includes several metal-oxide-semiconductors, and each metal-oxide-semiconductor constitutes a row of channels；The grid of the metal-oxide-semiconductor
It is electrically connected with the row drive control unit；The source electrode of the metal-oxide-semiconductor connects the power supply or low level, the metal-oxide-semiconductor
The output end to drain as the row of channels, connect with the first end of the LED lamp bead；The metal-oxide-semiconductor is described based on the received
Row control signal, controls the switching of on and off state, realizes the open and close of the row of channels.
In some embodiments, described in the first end of the same color LED lamp bead of the pixel of every row connects jointly
One row of channels of row drive array；The second segment of all LED lamp beads of the pixel of each column connects the constant current jointly
One constant flow channel of drive module.
In some embodiments, the first end of the LED lamp bead be anode, second end is cathode, the power supply with it is described
The source electrode of the metal-oxide-semiconductor of row drive array is electrically connected, the drain electrode of the metal-oxide-semiconductor of the row drive array and the anode of the LED lamp bead
Electrical connection, one end of the constant-current driven module is electrically connected with the cathode of the LED lamp bead, the constant-current driven module it is another
End connection low level.
In some embodiments, the first end of the LED lamp bead be cathode, second end be anode, the power supply with it is described
One end of constant-current driven module is electrically connected, and the other end of the constant-current driven module is electrically connected with the anode of the LED lamp bead, institute
The drain electrode for stating the metal-oxide-semiconductor of row drive array is electrically connected with the cathode of the LED lamp bead, the source of the metal-oxide-semiconductor of the row drive array
Pole connects low level.
In some embodiments, the pixel includes red LED lamp bead and non-red LED lamp bead, and the power supply includes
The power supply output of two different voltages, one of power supply export the metal-oxide-semiconductor of row of channels corresponding with the red LED lamp bead
Source electrode connection, the source electrode company of the metal-oxide-semiconductor of at least one power supply output row of channels corresponding with the non-red LED lamp bead in addition
It connects.
In some embodiments, the power supply includes AC-DC conversion circuit, to make LED display driver circuit direct
Electric energy is obtained from alternating current.
In some embodiments, the constant-current driven module is generated in each constant flow channel and is corresponded to according to display data
The PWM constant current driving signal of duty ratio.
One embodiment of the invention additionally provides a kind of LED display, including LED array and LED above-mentioned display driving
Circuit, the LED array are made of pixel array arrangement, and each pixel includes at least two LED lamp beads, described
LED display driver circuit drives the LED array work.
In some embodiments, the pixel includes the LED lamp bead or four kinds of different colours of three kinds of different colours
LED lamp bead.
LED display driver circuit provided in an embodiment of the present invention allows multiple LED lamp beads in pixel to use different rows
Channel, and it is multiplexed the constant flow channel of same row, the control thinking based on time-sharing multiplex, in the time that every a line pixel is shown
Interior, each LED lamp bead is luminous in Time-sharing control pixel, and in the same time, only one LED lamp bead of each pixel shines
Work forms the display content of a complete pixel using persistance of human vision；A pixel in compared to the prior art
Multiple LED lamp beads in point use the same row of channels, and the LED of the scheme of different constant flow channels, the present embodiment shows driving
Circuit, the LED lamp bead in a pixel are multiplexed a constant flow channel, considerably reduce the quantity of constant flow channel, driving electricity
The design on road is simpler, reduces design difficulty and cost；It is logical can also to reduce constant current simultaneously for the quantity for reducing constant flow channel
The power consumption in road itself realizes energy-efficient effect.At the same time it can also increase the size of the driving current in constant flow channel, subtract
Small parasitic capacitance, coupling and other influences of interference to driving current, are promoted aobvious when display effect, especially low ash are shown
Show effect.
Detailed description of the invention
Fig. 1 is the rough schematic view of the LED display driver circuit of the prior art；
Fig. 2 is the structural schematic diagram of the LED display driver circuit of one embodiment of the invention；
Fig. 3 is the structural schematic diagram of the LED display driver circuit of another embodiment of the present invention；
Fig. 4 is that the structural schematic diagram after row drive array is refined in the LED display driver circuit of one embodiment of the invention；
Fig. 5 is that the structural schematic diagram after row drive array is refined in the LED display driver circuit of another embodiment of the present invention；
Fig. 6 is that the structural schematic diagram after row drive array is refined in the LED display driver circuit of further embodiment of this invention.
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing
Give better embodiment of the invention.But the invention can be realized in many different forms, however it is not limited to herein
Described embodiment.On the contrary, the purpose of providing these embodiments is that making to understand more the disclosure
Add thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more
Any and all combinations of relevant listed item.
One embodiment of the invention provides a kind of LED display driver circuit, for driving the LED battle array of pixel array arrangement
Column 50, each pixel 51 include at least two LED lamp beads；As shown in Fig. 2, including row drive array 10, constant-current driven module
20, power supply 30, the row drive array 10, LED lamp bead, constant-current driven module 20 are connected in series, and are electrically connected with the power supply 30
It connects；
The row drive array 10 includes several row of channels, in row of channels and at least one described pixel 51
A LED lamp bead first end electrical connection, the constant-current driven module 20 includes several constant flow channels, and constant current is logical
Road is electrically connected with the second end of all LED lamp beads in pixel 51 described at least one；
When needing to drive the pixel 51 job, pixel 51 described in 10 Time-sharing control of row drive array
The unlatching of the row of channels of interior each LED lamp bead connection；The constant-current driven module 20 generates correspondence according to display data
Constant current driving signal, control LED lamp bead in the pixel 51 and shine.
As shown in Fig. 2, LED array 50 is formed by 51 array arrangement of pixel, each pixel 51 includes at least two LED
Lamp bead.It is exemplary, as shown in Fig. 2, pixel 51 may include the LED lamp bead of three different colours --- red LED lamp bead
(R), green LED lamp bead (G) and blue led lamp bead (B) allow pixel 51 that can carry out full-color display with this.It is exemplary,
Pixel 51 may include the LED lamp bead of four different colours --- in red LED lamp bead (R), green LED lamp bead (G), blue
Except LED lamp bead (B), increase the LED lamp bead of other colors, such as White LED lamp bead, as shown in Figure 3.Increased LED lamp bead,
Be also possible to LED lamp bead of other colors, such as red LED lamp bead (R), yellow led lamp bead etc., with specific reference to be actually needed into
Row determines.LED lamp bead is set by increasing, the color that pixel can be allowed to show is more gorgeous, promotes display effect.It can manage
Solution, pixel 51 can also include greater number of LED lamp bead, the facilities of specific quantity, color, Ke Yigen
It is determined according to actual needs.
In LED array 50, pixel 51 can form the matrix of M row N column.LED lamp bead quantity inside pixel 51 is S
It is a.Corresponding, constant-current driven module 20 includes at least N number of constant flow channel, and it is logical that row drive array 10 includes at least M*S row
Road.The second end of all LED lamp beads in the pixel 51 of each column, can simultaneously with a perseverance in constant-current driven module 20
Circulation road electrical connection.The first end of mutually homotactic LED lamp bead in every a line all pixels point 51 can drive with row simultaneously
One row of channels of array 10 is electrically connected.The sequence of LED lamp bead in pixel 51 can be arranged according to color, such as red
Color LED lamp bead (R) is First ray, and green LED lamp bead (G) is the second sequence, and blue led lamp bead (B) is third sequence.Work as picture
Vegetarian refreshments 51 includes when repeating the LED lamp bead of color, they can be identical sequence, be also possible to different sequences.
Exemplary, pixel 51 includes LED lamp bead --- the red LED lamp bead (R), green LED lamp of three different colours
Pearl (G) and blue led lamp bead (B).The first end of red LED lamp bead (R) in every row all pixels point 51, can be all connected with
To a row of channels.As shown in Fig. 2, the pixel 51 of the i-th row, the first of the red LED lamp bead (R) of the row all pixels point
End, is connected to " i row r " row of channels；Correspondingly, the first end of the green LED lamp bead (G) of the row all pixels point, is all connected with
To " i row g " row of channels；The first end of the blue led lamp bead (B) of the row all pixels point is connected to " i row b " row of channels.The
The pixel 51 of j column, the second end of the column all pixels point are connected to the jth column constant flow channel of constant-current driven module 20.
Constant-current driven module 20 generates corresponding constant current driving signal according to display data.Specifically, constant current drives mould
Block 20 can generate corresponding constant current driving signal according to display data in each constant flow channel.When display, imitated according to display
The requirement of fruit, different LED lamp beads may need to issue different brightness.At this point, constant current driving signal is specially PWM (pulsewidth tune
System) constant current driving signal using different duty ratios realizes the adjusting of brightness.
First end, the second end of LED lamp bead refer to positive, one in cathode.When first end is anode, second end is
When cathode, as shown in Fig. 2, power supply 30 is electrically connected with one end of row drive array 10, the other end and LED light of row drive array 10
The anode electrical connection of pearl, the cathode of LED lamp bead is electrically connected with one end of constant-current driven module 20, constant-current driven module 20 it is another
End connection low level, such as ground terminal.Also referred to as common anode structure.
When first end is cathode, and second end is anode, as shown in figure 3, one end of power supply 30 and constant-current driven module 20
Electrical connection, the other end of constant-current driven module 20 are electrically connected with the anode of LED lamp bead, the cathode and row drive array of LED lamp bead
10 one end electrical connection, the other end of row drive array 10 connect low level, such as ground terminal.Also referred to as common cathode structure.
Below by taking the common anode structure in Fig. 2 as an example, the working principle of the LED display driver circuit in the present embodiment is carried out
It illustrates.
As shown in Fig. 2, 10 one end of row drive array is connect with power supply 30, the anode of the other end and LED lamp bead is connected；Constant current
The connection of the cathode of 20 one end of drive module and LED lamp bead, other end ground connection.When needing the i-th row pixel to be worked, row is driven
Dynamic array 10 controls row of channels --- tri- channels i row r, i row g, i row b of the i-th row pixel connection, carries out timesharing unlatching.Show
Example, can in t moment, allow i row r row of channels open so that i row r row of channels connection red LED lamp bead (R) anode with
Power supply connection.Meanwhile for each column red LED lamp bead (R) on i row, respective cathode respectively with constant-current driven module 20
A constant flow channel electrical connection.Constant-current driven module 20 can generate correspondence according to display data in each constant flow channel
Constant current driving signal, control the column red LED lamp bead (R) carry out it is luminous.Then, at the t+t1 moment, it is logical to close i row r row
Road, opens i row g row of channels, and constant-current driven module 20 generates corresponding constant current in each constant flow channel and drive according to display data
Dynamic signal, the green LED lamp bead (G) of the i-th row of control carry out luminous；It is similar, at the t+2*t1 moment, i row g row of channels is closed,
I row b row of channels is opened, constant-current driven module 20 generates corresponding constant current driving according to display data in each constant flow channel
Signal, the blue led lamp bead (B) of the i-th row of control carry out luminous.In this way, completing the driving of the i-th row pixel.View-based access control model
Residual phenomena, the LED lamp bead in Time-sharing control pixel successively shine work, and spectators can also be allowed to form complete pixel
Content.And so on, it progressively scans, the driving of the pixel of all rows in LED array 50 can be realized, a picture can be completed
The display in face.
The LED display driver circuit of the present embodiment allows multiple LED lamp beads in pixel to use different row of channels, and
The constant flow channel of multiplexing same row, the control thinking based on time-sharing multiplex, within the time that every a line pixel is shown, timesharing control
Each LED lamp bead shines in pixel processed, and in the same time, only one LED lamp bead of each pixel shines work, utilization
Persistance of human vision forms the display content of a complete pixel；It is multiple in a pixel in compared to the prior art
LED lamp bead uses the same row of channels, the scheme of different constant flow channels, the LED display driver circuit of the present embodiment, a picture
LED lamp bead in vegetarian refreshments is multiplexed a constant flow channel, considerably reduces the quantity of constant flow channel, the design of driving circuit is more
Simply, design difficulty and cost are reduced；The quantity for reducing constant flow channel, can also reduce the electric energy of constant flow channel itself simultaneously
Consumption, realizes energy-efficient effect.At the same time it can also increase the size of the driving current in constant flow channel, reduce parasitic capacitance, coupling
It closes and other interferes the influence to driving current, promote display effect when display effect, especially low ash are shown.
As shown in figure 4, row drive array 10, can specifically include row drive control unit 11 and row pipe array 12, wherein
Row drive control unit 11 includes several metal-oxide-semiconductors (field effect transistor) for generating row control signal, row pipe array 12, each
The metal-oxide-semiconductor constitutes a row of channels；The grid of the metal-oxide-semiconductor is electrically connected with row drive control unit 11；The source of the metal-oxide-semiconductor
Pole connects power supply 30 or low level, and the output end to drain as row of channels is connect with the first end of LED lamp bead；The metal-oxide-semiconductor
The row controls signal based on the received, controls the switching of on and off state, realizes the open and close of row of channels.At this
In embodiment, as shown in figure 4, the first end of LED lamp bead is anode, the source electrode of metal-oxide-semiconductor connects power supply 30, and drain electrode is used as row of channels
Output end, with LED lamp bead anode connect.Metal-oxide-semiconductor can be PMOS tube or NMOS tube, preferably PMOS tube.Some
In embodiment, as shown in figure 5, the first end of LED lamp bead is cathode, the source electrode connection low level of metal-oxide-semiconductor (is specifically as follows ground connection
End), the output end to drain as row of channels is connect with the cathode of LED lamp bead, and constant-current driven module connects power supply 30.
In the example of fig. 4, power supply 30 only provides the power supply output of a voltage VCC.Due to red LED lamp bead and non-
Work of the red LED lamp bead (such as blue led lamp bead, green LED lamp bead) there are different operating voltages, in red LED lamp bead
1.8~2.2V or so is generally as voltage, rather than the work of red LED lamp bead (such as blue led lamp bead, green LED lamp bead)
Voltage is generally 2.6~3.2V or so, and the two has a certain difference in operating voltage.If in the driving circuit, with one
A voltage VCC comes while being supplied to red LED lamp bead, blue led lamp bead, green LED lamp bead to work, then red LED
Voltage on the circuit of lamp bead on other devices can be larger, can there is biggish electric energy loss, or even influences the service life of the device.
Therefore, in some embodiments, as shown in fig. 6, the power supply that power supply 30 includes two different voltages exports Vcc-1, Vcc-2,
In power supply output Vcc-1 row of channels corresponding with red LED lamp bead metal-oxide-semiconductor source electrode connection, remaining power supply exports
The source electrode of the metal-oxide-semiconductor of Vcc-2 row of channels corresponding with non-red LED lamp bead connects.Specifically, as shown in fig. 6, pixel 51 only
Including red LED lamp bead, blue led lamp bead, green LED lamp bead, the source electrode of the corresponding metal-oxide-semiconductor of red LED lamp bead connects Vcc-
1, the source electrode connection Vcc-2 of blue led lamp bead, the corresponding metal-oxide-semiconductor of green LED lamp bead.
It is understood that power supply 30 can also provide suitable when pixel 51 further includes the LED lamp bead of other colors
The power supply of the voltage value of the LED lamp bead of the color exports, or is exported with blue led lamp bead using the same power supply.In order to more
Add and be accurately controlled shining for driving LED modules with different colors lamp bead, can respectively provide different power supplys for LED modules with different colors lamp bead
Output.Certainly, from the angle for simplifying power circuit, the LED modules with different colors lamp bead that operating voltage can also be allowed close uses identical
Power supply output.
Power supply 30 can specifically include AC-DC conversion circuit, to allow LED display driver circuit directly to obtain from alternating current
Take electric energy.Further, when LED modules with different colors lamp bead needs to provide different power supply outputs, power supply 30 can also include straight
Voltage boosting/lowering circuit is flowed, to obtain the power supply output of different voltages.It is understood that power supply 30 can also be from DC power supply
Obtain electric energy.Correspondingly, power supply 30 can also only include DC boosting/reduction voltage circuit.The specific design of power supply 30, can basis
Actual needs, is selected from existing power supply scheme, is determined.
The LED display driver circuit of the present embodiment allows multiple LED lamp beads in pixel to use different row of channels, and
The constant flow channel of multiplexing same row, the control thinking based on time-sharing multiplex, within the time that every a line pixel is shown, timesharing control
Each LED lamp bead shines in pixel processed, and in the same time, only one LED lamp bead of each pixel shines work, utilization
Persistance of human vision forms the display content of a complete pixel；It is multiple in a pixel in compared to the prior art
LED lamp bead uses the same row of channels, the scheme of different constant flow channels, the LED display driver circuit of the present embodiment, a picture
LED lamp bead in vegetarian refreshments is multiplexed a constant flow channel, considerably reduces the quantity of constant flow channel, the design of driving circuit is more
Simply, design difficulty and cost are reduced；The quantity for reducing constant flow channel, can also reduce the electric energy of constant flow channel itself simultaneously
Consumption, realizes energy-efficient effect.At the same time it can also increase the size of the driving current in constant flow channel, reduce parasitic capacitance, coupling
It closes and other interferes the influence to driving current, promote display effect when display effect, especially low ash are shown.
One embodiment of the invention additionally provides a kind of LED display, including LED array and LED above-mentioned display driving
Circuit, the LED array are made of pixel array arrangement, and each pixel includes at least two LED lamp beads, described
LED display driver circuit is electrically connected with LED array, and the LED display driver circuit drives the LED array work.
The specific setting and working method of LED array and LED display driver circuit, may refer to the description of front,
Which is not described herein again.
The LED display of the present embodiment allows multiple LED lamp beads in pixel to use different row of channels, and is multiplexed same
The constant flow channel of one column, the control thinking based on time-sharing multiplex, within the time that every a line pixel is shown, Time-sharing control pixel
Each LED lamp bead shines in point, and in the same time, only one LED lamp bead of each pixel shines work, residual using vision
Phenomenon is stayed to form the display content of a complete pixel；Multiple LED light in compared to the prior art in a pixel
Pearl uses the same row of channels, the scheme of different constant flow channels, the LED display driver circuit of the present embodiment, a pixel
Interior LED lamp bead is multiplexed a constant flow channel, considerably reduces the quantity of constant flow channel, the design of driving circuit is simpler
It is single, reduce design difficulty and cost；The quantity of constant flow channel is reduced, the electric energy that can also reduce constant flow channel itself simultaneously disappears
Consumption, realizes energy-efficient effect.At the same time it can also increase the size of the driving current in constant flow channel, reduce parasitic capacitance, coupling
And other interfere the influence to driving current, promote display effect when display effect, especially low ash are shown.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of LED display driver circuit, for driving the LED array of pixel array arrangement, each pixel includes at least
Two LED lamp beads, which is characterized in that including row drive array, constant-current driven module, power supply, the row drive array, LED light
Pearl, constant-current driven module be connected in series, and with the power electric connection；
The row drive array includes several row of channels, and one in a row of channels and at least one described pixel
The first end of LED lamp bead is electrically connected, and the constant-current driven module includes several constant flow channels, a constant flow channel at least
The second end of all LED lamp beads in one pixel is electrically connected；
When needing to drive a pixel job, each of in pixel described in the row drive array Time-sharing control
The unlatching of the row of channels of LED lamp bead connection；The constant-current driven module generates corresponding constant current driving according to display data
Signal, the LED lamp bead controlled in the pixel shine.
2. LED display driver circuit according to claim 1, which is characterized in that the row drive array, including row driving
Control unit and row pipe array, wherein
The row drive control unit is for generating row control signal；
The row pipe array includes several metal-oxide-semiconductors, and each metal-oxide-semiconductor constitutes a row of channels；The grid of the metal-oxide-semiconductor and institute
State the electrical connection of row drive control unit；The source electrode of the metal-oxide-semiconductor connects the power supply or low level, the drain electrode of the metal-oxide-semiconductor
As the output end of the row of channels, it is connect with the first end of the LED lamp bead；The metal-oxide-semiconductor row control based on the received
Signal processed controls the switching of on and off state, realizes the open and close of the row of channels.
3. LED display driver circuit according to claim 1, which is characterized in that the identical face of the pixel of every row
The first end of color LED lamp bead connects a row of channels of the row drive array jointly；All LED of the pixel of each column
The second segment of lamp bead connects a constant flow channel of the constant-current driven module jointly.
4. LED display driver circuit according to claim 2, which is characterized in that the first end of the LED lamp bead is positive
Pole, second end are cathode, and the power supply is electrically connected with the source electrode of the metal-oxide-semiconductor of the row drive array, the row drive array
The drain electrode of metal-oxide-semiconductor is electrically connected with the anode of the LED lamp bead, and one end of the constant-current driven module is negative with the LED lamp bead
The other end of pole electrical connection, the constant-current driven module connects low level.
5. LED display driver circuit according to claim 2, which is characterized in that the first end of the LED lamp bead is negative
Pole, second end are anode, and the power supply is electrically connected with one end of the constant-current driven module, the constant-current driven module it is another
It holds and is electrically connected with the anode of the LED lamp bead, the drain electrode of the metal-oxide-semiconductor of the row drive array and the negative electricity of the LED lamp bead
The source electrode of connection, the metal-oxide-semiconductor of the row drive array connects low level.
6. LED display driver circuit according to claim 4, which is characterized in that the pixel includes red LED lamp bead
With non-red LED lamp bead, the power supply includes the power supply output of two different voltages, one of power supply output and the red
The source electrode of the metal-oxide-semiconductor of the corresponding row of channels of LED lamp bead connects, the output of at least one power supply and the non-red LED lamp in addition
The source electrode of the metal-oxide-semiconductor of the corresponding row of channels of pearl connects.
7. LED display driver circuit according to claim 1-6, which is characterized in that the power supply includes exchange-
DC converting circuit, to allow LED display driver circuit directly to obtain electric energy from alternating current.
8. LED display driver circuit according to claim 1-6, which is characterized in that the constant-current driven module
According to display data, the PWM constant current driving signal of duty ratio corresponding is generated in each constant flow channel.
9. a kind of LED display, the LED display driver circuit including any one of LED array and claim 1-8, the LED
Array is made of pixel array arrangement, and each pixel includes at least two LED lamp beads, the LED display driving electricity
Road drives the LED array work.
10. LED display according to claim 9, which is characterized in that the pixel includes three kinds of different colours
The LED lamp bead of LED lamp bead or four kinds of different colours.
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| CN201811553169.4A CN109559676A (en) | 2018-12-18 | 2018-12-18 | LED display driver circuit and LED display |
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| CN201811553169.4A CN109559676A (en) | 2018-12-18 | 2018-12-18 | LED display driver circuit and LED display |
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| CN201811553169.4A Pending CN109559676A (en) | 2018-12-18 | 2018-12-18 | LED display driver circuit and LED display |
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