CN206601944U - A kind of low-light level high gray circuit for LED display - Google Patents
A kind of low-light level high gray circuit for LED display Download PDFInfo
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- CN206601944U CN206601944U CN201720122870.5U CN201720122870U CN206601944U CN 206601944 U CN206601944 U CN 206601944U CN 201720122870 U CN201720122870 U CN 201720122870U CN 206601944 U CN206601944 U CN 206601944U
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Abstract
The utility model belongs to LED display fields, is related to a kind of low-light level high gray circuit for LED display.The low-light level high gray circuit for being used for LED display includes row gating switch, row gating switch, constant-current source, LED lamp bead, controller, shunt circuit and first switch pipe；The positive pole of the LED lamp bead is connected to first voltage source by the row gating switch, and the negative pole of the LED lamp bead opens up connection by the column selection and is connected to the constant-current source；The constant-current source ground connection；The first switch pipe is connected to form the first series circuit with the shunt circuit, and first series circuit is connected in parallel on the LED lamp bead both positive and negative polarity, and the controller is connected to control the work of the first switch pipe with the first switch pipe.The circuit drives with realizing multiple different electric currents and fast and stable by using shunt circuit and the first series circuit, substantially increases the gray scale display level under low illumination conditions, shows low-light level more fine and smooth, image is more life-like.
Description
Technical field
The utility model is related to LED display fields, more particularly to a kind of low-light level high gray electricity for LED display
Road.
Background technology
LED display is by its visual angle is big, small power consumption, uniform in color are consistent, thick ultra-thin, the screen body weight of screen is light, fault rate
The advantages such as low, easy care, are widely used in industry-by-industry.For LED display, the problem of must considering have color, clear
Degree, gray scale, brightness regulation etc., these are all the problem of application to LED display have considerable influence.The utility model is related to
The problem of low bright high ash.With the shortening of pel spacing in LED display, LED display is applied to indoor letter more and more
Breath or video playback.But it is due to relatively fixing for indoor environment brightness, and than dark.Therefore, closely seen in human eye
When seeing, LED display is too bright to cause dazzling, poor user experience.So, the brightness of reduction LED display is a kind of indoor screen
The problem of using having to solve.LED lamp bead driving is general using constant current driving, reduces the brightness of LED display, it is meant that
Driving current is reduced, is typically realized by PWM, but it is serious to have half-tone information loss only by PWM
Technical problem, display effect substantially reduces.
Utility model content
In view of the above-mentioned problems, the utility model provides a kind of low-light level high gray circuit for LED display, the circuit
The driving current of multiscale can be provided, realize that a variety of GTGs are shown.It is specific as follows：
A kind of low-light level high gray circuit for LED display, wherein, including row gating switch, row gating switch, perseverance
Stream source, LED lamp bead, controller, shunt circuit and first switch pipe；The positive pole of the LED lamp bead passes through the row gating switch
First voltage source is connected to, the negative pole of the LED lamp bead opens up connection by the column selection and is connected to the constant-current source；The constant current
Source is grounded；The first switch pipe connects to form the first series circuit with the shunt circuit, and first series circuit is in parallel
It is connected on the LED lamp bead both positive and negative polarity, the controller is connected to control the first switch with the first switch pipe
The work of pipe.
Further, in addition to second switch pipe and first resistor；One end of the first resistor is connected to the shunting
On the tie point of circuit and the first switch pipe, the other end is connected with the 3rd switch terminals of the second switch pipe；It is described
4th switch terminals of second switch pipe are connected with the negative pole of the LED lamp bead；3rd switch terminals are also connected to ground；It is described
Second switch pipe is connected with the controller is controlled by it work；The controller is controlling the first switch pipe conducting
Control the second switch pipe to turn on simultaneously, control the second switch pipe to disconnect after preset time.
Further, the scope of the preset time is 1ns to 20ns.
Further, in addition to the second voltage source, the 3rd switching tube, second resistance, 3rd resistor and the first electric capacity；It is described
Second resistance connects to form first resistor series circuit with 3rd resistor；The first resistor series circuit is in parallel with the electric capacity
Form the first parallel circuit；One end ground connection of first parallel circuit, the other end passes through the 3rd switching tube and described the
Two voltage sources are connected；3rd switching tube is connected with the controller is controlled by it work；The second resistance and the 3rd
The tie point of resistance is connected with the control end of the first switch pipe.
Further, the first voltage source and the second voltage source are same voltage sources.
Further, in addition to first comparator, an input of the first comparator is connected to the second resistance
With on the tie point of 3rd resistor, another input connects the output end of the first comparator, the output end connection is described
The control end of first switch pipe.
Further, in addition to tertiary voltage source, the 4th switching tube, the 4th resistance, the 5th resistance and the second electric capacity；It is described
4th resistance and the 5th resistant series formation second resistance series circuit；The second resistance series circuit is in parallel with the electric capacity
Form the second parallel circuit；One end ground connection of second parallel circuit, the other end passes through the 4th switching tube and described the
Three voltage sources are connected；4th switching tube is connected with the controller is controlled by it work；4th resistance and the 5th
The tie point of resistance is connected with the control end of the second switch pipe.
Further, the tertiary voltage source and first voltage source are same voltage sources.
Further, in addition to the second comparator, an input of second comparator is connected to the 4th resistance
With on the tie point of the 5th resistance, another input connects the output end of second comparator, the output end connection is described
The control end of second switch pipe.
Further, the shunt circuit includes some second series circuits in parallel, and second series circuit includes
The 5th switching tube being connected in series and the 6th resistance, the 5th switching tube is also connected with the controller is controlled by it work.
Beneficial effect：
The low-light level high gray circuit for LED display of the utility model embodiment by using shunt circuit and
First series circuit drives with realizing multiple different electric currents and fast and stable, and each current value at least corresponds to a gray scale, because
This, the low-light level high gray circuit of the present embodiment can greatly improve the gray scale display level under low illumination conditions, while to original
Some drive circuits do not change substantially, it is ensured that while the display effect of high brightness, shown more under low illumination conditions
For exquisiteness, image is more life-like.
Brief description of the drawings
Fig. 1 is the structural representation of the low-light level high gray circuit of the utility model embodiment.
Fig. 2 is the structural representation of the drive circuit of the first switch pipe of the utility model embodiment.
Fig. 3 is the structural representation of the drive circuit of the second switch pipe of the utility model embodiment.
Fig. 4 is the shunt circuit structural representation of the utility model embodiment.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only to explain
The utility model, is not used to limit the utility model.
Fig. 1 is the structural representation of the low-light level high gray circuit of the utility model embodiment.Fig. 2 is that the utility model is real
Apply the structural representation of the drive circuit of the first switch pipe of example.Fig. 3 is the drive of the second switch pipe of the utility model embodiment
The structural representation of dynamic circuit.Fig. 4 is the shunt circuit structural representation of the utility model embodiment.
Fig. 1 to Fig. 4 is refer to, the low-light level high gray circuit for LED display of the present embodiment, including row gating are opened
Close 2, row gating switch 3, constant-current source 4, LED lamp bead 6, controller 1, shunt circuit 5 and first switch pipe Q1；The LED lamp bead 6
Positive pole first voltage source VCC1 is connected to by the row gating switch 2, the negative pole of the LED lamp bead 6 passes through the column selection
Open up pass 3 and be connected to the constant-current source 4；The constant-current source 4 is grounded；The first switch pipe Q1 connects with the shunt circuit 5
Form the first series circuit, first series circuit is connected in parallel on the both positive and negative polarity of LED lamp bead 6, the controller 1 with
The first switch pipe Q1 is connected to control the work of the first switch pipe Q1.
Further, the low-light level high gray circuit also includes second switch pipe Q2 and first resistor R1；The second switch
Pipe Q2 and first resistor R1 can realize that the LED lamp bead 6 is turned on rapidly under the driving of low current and electric current is stable, improve display
Display quality during quality, especially low-light level.One end of the first resistor R1 is connected to the shunt circuit 5 and described the
On one switching tube Q1 tie point, the other end is connected with the 3rd switch terminals of the second switch pipe Q2；The second switch
Pipe Q2 the 4th switch terminals are connected with the negative pole of the LED lamp bead 6；3rd switch terminals are also connected to ground；Described second
Switching tube Q2 is connected with the controller 1 is controlled by it work；The controller 1 is controlling the first switch pipe Q1 conductings
While control the second switch pipe Q2 to turn on, control the second switch pipe Q2 to disconnect after preset time.It is preferred that described
The scope of preset time is 1ns to 20ns.This part circuit operation principle is, in the case where the row gating switch 2 is turned on,
When starting low-light level mode of operation（That is first switch pipe Q1 is turned on, and first switch pipe Q1 is general work mode of operation when disconnecting）, the
Two switching tube Q2 are closed, then the first reference voltage source VCC1, first resistor R1 and ground formation path, now in the LED
The positive and negative end of pearl 6 one pressure drop of formation, this pressure drop is equal to the voltage on first resistor R1, and the preferably pressure drop is slightly less than this
The conducting voltage of LED lamp bead 6, therefore, the LED lamp bead 6 are not turned on.After preset time, such as 10ns, disconnect this and second open
Pipe Q2 is closed, the now pressure drop on the both positive and negative polarity of LED lamp bead 6 will not become.When row gating switch is closed, it is only necessary to little by little pressure drop
Change just realize that LED lamp bead 6 is turned on, therefore, the ratio of conducting is very fast, while curent change can be very steady, is very beneficial for
The display of low current.
Further, the low-light level high gray circuit also includes the second voltage source VCC2, the 3rd switching tube Q3, second resistance
R2,3rd resistor R3, the first electric capacity C1 and first comparator U1；The second resistance R2 connects to form first with 3rd resistor R3
Resistance series circuit；The first resistor series circuit is in parallel with the electric capacity C1 to form the first parallel circuit；Described first simultaneously
Join one end ground connection of circuit, the other end is connected by the 3rd switching tube Q3 with the second voltage source VCC2；Described
Three switching tube Q3 are connected with the controller is controlled by it work；An input of the first comparator U1 is connected to described
On two resistance R2 and 3rd resistor R3 tie point, another input connects the output end of the first comparator U1, described defeated
Go out end connection first switch pipe Q1 control end.It is preferred that, the first voltage source and the second voltage source are same voltage sources.
Certainly, first comparator U1 is dispensed in certain embodiments, now, the second resistance R2 and 3rd resistor R3
Tie point be connected with the control end of the first switch pipe Q1.
Further, the low-light level high gray circuit also includes tertiary voltage source VCC3, the 4th switching tube Q4, the 4th resistance
R4, the 5th resistance R5, the second electric capacity C2 and the second comparator U2；The 4th resistance R4 connects to form second with the 5th resistance R5
Resistance series circuit；The second resistance series circuit is in parallel with the electric capacity C2 to form the second parallel circuit；Described second simultaneously
Join one end ground connection of circuit, the other end is connected by the 4th switching tube Q4 with the tertiary voltage source VCC3；Described
Four switching tube Q4 are connected with the controller 1 and are controlled by it work；An input of the second comparator U2 is connected to described
On 4th resistance R4 and the 5th resistance R5 tie point, another input connects the output end of the second comparator U2, described
Output end connects the control end of the second switch pipe Q4.It is preferred that, the first voltage source VCC1 and tertiary voltage source VCC3 are
Same voltage source.Certainly, second comparator U2 is dispensed in certain embodiments, now, the 4th resistance R4
It is connected with the 5th resistance R5 tie point with the control end of the second switch pipe Q2.
Further, the shunt circuit includes some second series circuits in parallel, and second series circuit includes
The 5th switching tube Q5 being connected in series and the 6th resistance R6, the 5th switching tube Q5 is also connected with the controller to be controlled by it
Work.The present embodiment preferably has three the second series circuits, realizes 4 different current values.
The low-light level high gray circuit for LED display of the utility model embodiment by using shunt circuit and
First series circuit drives with realizing multiple different electric currents and fast and stable, and each current value at least corresponds to a gray scale, its
It is real, more gray scales can be corresponded in PWM, therefore, the low-light level high gray circuit of the present embodiment can greatly improve low
Gray scale display level under brightness case, shows more fine and smooth, image is more life-like under low illumination conditions.
Detailed Jie has been carried out to the low-light level high gray circuit provided by the utility model for LED display above
Continue, specific case used herein is set forth to principle of the present utility model and embodiment, above example is said
It is bright to be only intended to help and understand core concept of the present utility model；Simultaneously for those of ordinary skill in the art, according to this reality
With new thought, it will change in specific embodiments and applications, in summary, this specification content is not
It is interpreted as to limitation of the present utility model.
Claims (10)
1. a kind of low-light level high gray circuit for LED display, it is characterised in that opened up including row gating switch, column selection
Pass, constant-current source, LED lamp bead, controller, shunt circuit and first switch pipe；The positive pole of the LED lamp bead is gated by the row
Switch is connected to first voltage source, and the negative pole of the LED lamp bead opens up connection by the column selection and is connected to the constant-current source；It is described
Constant-current source is grounded；The first switch pipe connects to form the first series circuit with the shunt circuit, first series circuit
It is connected in parallel on the LED lamp bead both positive and negative polarity, the controller is connected to control described first with the first switch pipe
The work of switching tube.
2. it is used for the low-light level high gray circuit of LED display as claimed in claim 1, it is characterised in that also including second
Switching tube and first resistor；One end of the first resistor is connected to the tie point of the shunt circuit and the first switch pipe
On, the other end is connected with the 3rd switch terminals of the second switch pipe；4th switch terminals of the second switch pipe with it is described
The negative pole of LED lamp bead is connected；3rd switch terminals are also connected to ground；The second switch pipe is connected with the controller
It is controlled by it work；The controller controls the second switch pipe to turn on while the first switch pipe conducting is controlled,
And control the second switch pipe to disconnect after preset time.
3. it is used for the low-light level high gray circuit of LED display as claimed in claim 2, it is characterised in that when described default
Between scope be 1ns to 20ns.
4. it is used for the low-light level high gray circuit of LED display as claimed in claim 2, it is characterised in that also including second
Voltage source, the 3rd switching tube, second resistance, 3rd resistor and the first electric capacity；The second resistance connects to be formed with 3rd resistor
First resistor series circuit；The first resistor series circuit is in parallel with the electric capacity to form the first parallel circuit；Described first
One end ground connection of parallel circuit, the other end is connected by the 3rd switching tube with the second voltage source；Described 3rd opens
Controller connection is controlled by it work described in Guan Guanyu；The tie point of the second resistance and 3rd resistor and the first switch
The control end of pipe is connected.
5. it is used for the low-light level high gray circuit of LED display as claimed in claim 4, it is characterised in that first electricity
Potential source and the second voltage source are same voltage sources.
6. it is used for the low-light level high gray circuit of LED display as claimed in claim 4, it is characterised in that also including first
Comparator a, input of the first comparator is connected on the tie point of the second resistance and 3rd resistor, another defeated
Enter the output end of the end connection first comparator, the output end connects the control end of the first switch pipe.
7. it is used for the low-light level high gray circuit of LED display as claimed in claim 2, it is characterised in that also including the 3rd
Voltage source, the 4th switching tube, the 4th resistance, the 5th resistance and the second electric capacity；4th resistance is formed with the 5th resistant series
Second resistance series circuit；The second resistance series circuit is in parallel with the electric capacity to form the second parallel circuit；Described second
One end ground connection of parallel circuit, the other end is connected by the 4th switching tube with the tertiary voltage source；Described 4th opens
Controller connection is controlled by it work described in Guan Guanyu；The tie point of 4th resistance and the 5th resistance and the second switch
The control end of pipe is connected.
8. it is used for the low-light level high gray circuit of LED display as claimed in claim 7, it is characterised in that the 3rd electricity
Potential source and first voltage source are same voltage sources.
9. it is used for the low-light level high gray circuit of LED display as claimed in claim 7, it is characterised in that also including second
Comparator a, input of second comparator is connected on the tie point of the 4th resistance and the 5th resistance, another defeated
Enter the output end of end connection second comparator, the output end connects the control end of the second switch pipe.
10. it is used for the low-light level high gray circuit of LED display as claimed in claim 1, it is characterised in that the shunting electricity
Road includes some second series circuits in parallel, and second series circuit includes the 5th switching tube being connected in series and the 6th electricity
Resistance, the 5th switching tube is also connected with the controller is controlled by it work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720122870.5U CN206601944U (en) | 2017-02-07 | 2017-02-07 | A kind of low-light level high gray circuit for LED display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720122870.5U CN206601944U (en) | 2017-02-07 | 2017-02-07 | A kind of low-light level high gray circuit for LED display |
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| Publication Number | Publication Date |
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| CN206601944U true CN206601944U (en) | 2017-10-31 |
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| CN201720122870.5U Active CN206601944U (en) | 2017-02-07 | 2017-02-07 | A kind of low-light level high gray circuit for LED display |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112017596A (en) * | 2020-09-11 | 2020-12-01 | 京东方科技集团股份有限公司 | Display panel, brightness adjusting method and display device |
-
2017
- 2017-02-07 CN CN201720122870.5U patent/CN206601944U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112017596A (en) * | 2020-09-11 | 2020-12-01 | 京东方科技集团股份有限公司 | Display panel, brightness adjusting method and display device |
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