CN103871355A - LED (light emitting diode) display large-screen high-speed scanning controller - Google Patents
LED (light emitting diode) display large-screen high-speed scanning controller Download PDFInfo
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- CN103871355A CN103871355A CN201210549760.9A CN201210549760A CN103871355A CN 103871355 A CN103871355 A CN 103871355A CN 201210549760 A CN201210549760 A CN 201210549760A CN 103871355 A CN103871355 A CN 103871355A
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Abstract
The invention discloses an LED (light emitting diode) display large-screen high-speed scanning controller, which comprises an LED large-screen driving chip, a decoder and a controllable high-speed discharging circuit, wherein the LED large-screen driving chip is connected with the decoder, the decoder decodes control signals and is connected with a switch tube used as a power supply switch, the switch tube controls the voltage of a plurality of lines of LEDs, the controllable high-speed discharging circuit performs discharging on the output end when the switch tube is switched off. The LED display large-screen high-speed scanning controller has the advantages that the scanning line output falling edge can reach one microsecond, the controllable discharging is carried out on scanning lines, and the output end after the discharging can be controlled into a high impedance state. The trailing phenomenon is eliminated, the refreshing rate is improved, and the influence caused by LED electricity leakage and open circuit can be eliminated.
Description
Technical field
The present invention relates to LED large screen display field.
Background technology
LED display can be divided into again static screen and scan screen.The R/G/BLED that so-called static screen is exactly each picture element has an independently control end.Image whole screen in a frame is to show simultaneously.And so-called scan screen refers to that a few row R/G/B LED share a control end, these several row are powered and are reached the object that shows complete image by sequential again.Give an example: take 1/4 scanning as example, first a frame time is divided into 4 parts, within the 0-1/4 time, first shows the first row, in the 1/4-2/4 time, just show the second row, by that analogy.Clearly, in this case, image is not that whole screen shows simultaneously in a frame, first shows that 1/4 image shows another 1/4 image again, has just shown complete image after 4 1/4.The power consumption that is understood that 1/4 scan screen under the equal peak point current of R/G/B LED is only 1/4 of static screen above.Certain brightness is now only also the former 1/4.But scan screen, because multirow shares a road control end, so its constant-current control circuit will greatly reduce, becomes the present invention also just to decrease
Scan pattern, its application principle figure is shown in Fig. 1.In Fig. 1,138 is that 38 code translators are decoded as control signal double-wire signal, and as shown in Figure 8, Pmos pipe is as power switch control V1 ~ V4 voltage.Fig. 1 is one the 1/4 LED display schematic diagram of sweeping.Its principle of work be in 1 two field picture every row power supply V1-V4 by the time of the each unlatching 1/4 of control requirement.The advantage of doing is like this can more effectively utilize the display characteristic of LED and reduce hardware cost invention.Its shortcoming is exactly in 1 two field picture, and every row LED can only show for 1/4 time.As: when frame frequency is 50Hz, the displaying time of every row is Tm=1000/(50 × 4)=5ms.If adopt higher frame frequency or scanning progression further to increase, that displaying time will be shorter, as 50Hz frame frequency, and when 1/16 scanning, Tm=1.25ms.Along with shortening of Tm, the normal operation of the product confrontation system of the rising of row power supply wave shape, negative edge will be just vital.
The principle of work of having told about scanning display screen above, Fig. 2 is the ideal waveform figure of 1/4 scan line power supply.But its waveform and desirable differing greatly in actual applications.Fig. 3 adopts the oscillogram of Pmos pipe as the control of row power switch.While shutoff due to Pmos pipe, its output is in tri-state state and out-put supply line (V1～v4) and LED lamp stray capacitance exist the voltage on power lead can not reduce at once, and its negative edge Tf will be greater than 100 microseconds.If ignore row power supply rising time (in fact, very short can ignoring of the time of rising edge), be not difficult to find out, in 1 two field picture, previous row and rear a line can be had an appointment overlapping time of 100 microseconds.For ease of analytical calculation, we can be approximately Tn overlapping time negative edge time T f.That is: Tn=Tf.So, should show the second row time, previous row still can be luminous with the control mode of the second row within Tn a period of time, will see that previous row is in glimmer our vision.The size of brightness is directly proportional to the ratio of displaying time to two row overlapping time, is directly proportional to Tn/Tm.Here we definition of T n/Tm is overlap ratio, also take 50Hz frame frequency as example, and Tn/Tm=0.1/(1000/(4 × 50))=2%.It seems that 2% overlap ratio is not also very large.But along with the raising of frame frequency or its overlap ratio of raising Tn/Tm of scanning progression will increase greatly.
We might as well bring up to 250Hz frame frequency and have a look at below, and now row power switch control waveform figure is as Fig. 3.Obviously, overlap ratio now reaches Tn/Tm=0.1/ (1000/ (4 × 250))=10%.Under so high overlap ratio, conditions of streaking will be fairly obvious.
Therefore, existing LED scanning giant-screen is realized scanning display mode by Pmos pipe switch, while shutoff due to PMOS, power lead can not reduce because stray capacitance exists the voltage on power lead in tri-state state at once, may cause showing wrong (conditions of streaking) in the time of next frame.
In every horizontal scanning line, added various blanking circuits in order to improve in the frame frequency application of scanning, traditional blanking circuit can improve scanning frame frequency to a certain extent.But this has brought again new problem, because service time is elongated, temperature raises, the variety of issues such as LED quality, and the reverse leakage that has LED light emitting diode becomes large.Thereby as traditional blanking circuit after form loop of electric leakage cause should not be luminous pixel light become bright spot from stain, under dark state, array brightens and brings so-called caterpillar problem.Take D14 electric leakage as example, if under normal circumstances when scan V2 when capable V2 be that the pixel at high level D24 place is black.Now 4 ends of LED giant-screen drive IC are high-impedance state, so and the voltage breakdown of light emitting diode be greater than in operating voltage D24 and do not have electric current D24 not work.If now D14 should be a variety of causes and causes reverse leakage to become the large larger leakage current (being greater than 1uA) that produces in operating voltage range.So now for D24, form loop of electric leakage shown in dotted lines in Figure 1, caused having produced in D24 electric current.In like manner the 4th column array all exists same problem D34, D44 all can shinnyly cause demonstration mistake.
Summary of the invention
The technical problem to be solved in the present invention is, provides a kind of LED to show giant-screen high-velocity scanning controller, and it can effectively be eliminated conditions of streaking and improve refresh rate, eliminates the impact coming because of light emitting diode electric leakage.
For solving above technical matters, the invention provides a kind of LED and show giant-screen high-velocity scanning controller, comprising: LED giant-screen drives chip, LED giant-screen drives chip to connect code translator; Code translator decoding control signal, code translator connects the switching tube as power switch, the supply voltage of switch controlled LED; Controlled high rate discharge circuit discharges to output terminal in the time that switching tube turn-offs.
Beneficial effect of the present invention is: sweep trace output negative edge can reach a microsecond left and right, horizontal scanning line of the present invention is carried out to controlled discharge, the controlled high-impedance state that is made as of output terminal after electric discharge.Eliminate conditions of streaking and improve refresh rate, eliminate the impact coming because of light emitting diode electric leakage.
Described controllable discharge circuit can controlled discharge level; The range of control of discharge level is that Vdd-1V is to VDD-2V.
Described controlled high rate discharge circuit can be set to high-impedance state output after electric discharge finishes.
Described controllable discharge circuit controlled discharge level is Vdd-1.4V.
Described switching tube is Pmos or Nmos switching tube.
Also comprise overcurrent and overheating protection circuit.
The described controlled high rate discharge circuit discharging time is less than 1 microsecond.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Fig. 1 is that existing scan pattern coordinates traditional blanking mode application principle figure;
Fig. 2 is the oscillogram of existing employing Pmos pipe as the control of row power switch;
Row power switch control waveform figure when Fig. 3 is existing frame frequency 250Hz;
Fig. 4 is power switch control waveform of the present invention, blanking control of discharge waveform, power switch output waveform;
Fig. 5 is power switch circuit block diagram of the present invention;
Fig. 6 is existing product power switch internal frame diagram.
Fig. 7 is controllable discharge circuit block diagram.
Embodiment
As shown in Figure 5, LED of the present invention shows giant-screen high-velocity scanning controller, comprising: LED giant-screen drives chip, and LED giant-screen drives chip to connect code translator; Code translator decoding control signal, code translator connects the switching tube as power switch, switch controlled several rows LED voltage; Controlled high rate discharge circuit discharges to output terminal in the time that switching tube turn-offs.
Described controllable discharge circuit can controlled discharge level; The range of control of discharge level be Vdd-1V to VDD-2V, preferred, controllable discharge circuit controlled discharge level is Vdd-1.4V.
The described controlled high rate discharge circuit discharging time is less than 10 microseconds, and the whole output that stops after time of arrival discharging can be set to high-impedance state.Preferably, the described controlled high rate discharge circuit discharging time is less than 1 microsecond.
Because service time is elongated, temperature raises, the variety of issues such as LED quality, the reverse leakage that has LED light emitting diode becomes large, forming loop of electric leakage as after traditional blanking circuit, thereby cause should not be luminous pixel light become bright spot from stain, under dark state, array brightens and brings so-called caterpillar problem.Leak electricity as example take D14 in Fig. 1, under normal circumstances when scanning V2 when capable, if the pixel that V2 is high level D24 place is black.Now 4 ends of LED giant-screen drive IC are high-impedance state, so and the voltage breakdown of light emitting diode be greater than in operating voltage D24 and do not have electric current D24 not work.If now D14 should be a variety of causes and causes reverse leakage to become the large larger leakage current (being greater than 1uA) that produces in operating voltage range.So now for D24, form loop of electric leakage shown in dotted lines in Figure 1, caused having produced in D24 electric current.In like manner the 4th column array all exists same problem D34, D44 all can shinnyly cause demonstration mistake.In order to solve smear problem, in the time that PMos switching tube turn-offs, increase high speed pull-down circuit, output level has been pulled down to 0, but produced short circuit caterpillar problem simultaneously, next controlling drop-down level closes and has no progeny at Pmos, control drop-down level and make more than drop-down level is controlled at VDD-1.4V, when V2 is output as 5V like this, V1 is 3.6V, V2-V1 is 1.4V, be less than the Vf forward conduction voltage of D24, all cannot give out light so this is the lamps such as D24, solved electric leakage caterpillar.
But because Vx high level is 5V, low level is 3.6V, all can be bright at V2 high level D14, D34, D44 once D24 open circuit, form open circuit caterpillar problem.Solution of the present invention be pull down to Vdd-1.4v lasting drop-down to change pulse into drop-down, output is set to high-impedance state after pulling down to VDD-1.4 at once, the caterpillar that now can reduce to open a way is to state a little less than atomic.
The present invention increases blanking control circuit and utilizes input control signal to produce pulse pulldown signal, closes to have no progeny at Pmos switching tube to generate a very short drop-down pulse of time at once, and dragging down rapidly the low output terminal of power switch is VX terminal voltage.
The present invention also increases overcurrent and overheating protection circuit.
The present invention also comprises high speed pull-down circuit as shown in Figure 7, pull-down circuit is by a 1.4VDC voltage source to VDD, an operational amplifier OPamp for high-speed driving and a gate-controlled switch Q1 composition. operational amplifier is connected to voltage follower structure, its input end connects DC voltage source output terminal and is connected to output terminal by switch Q1, and Q1 is connected to blanking circuit and produces.When Pmos switching tube input end has cut-off signals, blanking circuit can produce a blanking discharge pulse signal, the high level of this pulse signal can be opened Q1 pipe, within this high level pulse time, output terminal is discharged, so Q1 switching tube turn-offs because Pmos now opens the light and also now exports and be set to high-impedance state in off state, the output voltage that output voltage is operational amplifier after pulse step-down.
The present invention is not limited to embodiment discussed above.Above the description of embodiment is intended in order to describe and illustrate the technical scheme the present invention relates to.Apparent conversion based on the present invention enlightenment or substitute and also should be considered to fall into protection scope of the present invention.Above embodiment is used for disclosing best implementation method of the present invention, to make the those of ordinary skill in field of the present invention can apply numerous embodiments of the present invention and multiple alternative reaches object of the present invention.
Claims (7)
1. LED shows a giant-screen high-velocity scanning controller, it is characterized in that, comprising:
LED giant-screen drives chip, and LED giant-screen drives chip to connect code translator;
Code translator decoding control signal, code translator connects the switching tube as power switch, the supply voltage of switch controlled LED;
Controlled high rate discharge circuit discharges to output terminal in the time that switching tube turn-offs.
2. LED as claimed in claim 1 shows giant-screen high-velocity scanning controller, it is characterized in that, described controllable discharge circuit can controlled discharge level; The range of control of discharge level is that Vdd-1V is to VDD-2V.
3. LED as claimed in claim 2 shows giant-screen high-velocity scanning controller, it is characterized in that, described controlled high rate discharge circuit can be set to high-impedance state output after electric discharge finishes.
4. LED as claimed in claim 3 shows giant-screen high-velocity scanning controller, it is characterized in that, described controllable discharge circuit controlled discharge level is Vdd-1.4V.
5. LED as claimed in claim 3 shows giant-screen high-velocity scanning controller, it is characterized in that, described switching tube is Pmos or Nmos switching tube.
6. LED as claimed in claim 3 shows giant-screen high-velocity scanning controller, it is characterized in that, also comprises overcurrent and overheating protection circuit.
7. LED as claimed in claim 3 shows giant-screen high-velocity scanning controller, it is characterized in that, the described controlled high rate discharge circuit discharging time is less than 1 microsecond.
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| CN105161053A (en) * | 2015-09-11 | 2015-12-16 | 深圳市明微电子股份有限公司 | Anti-streaking row-scanning control chip and anti-streaking LED display circuit |
| CN105810146A (en) * | 2016-05-16 | 2016-07-27 | 北京集创北方科技股份有限公司 | Shadow eliminating circuit and control method thereof, line drive circuit and display screen |
| CN105873306A (en) * | 2015-01-12 | 2016-08-17 | 明阳半导体股份有限公司 | Driving system, driving circuit and scanning circuit of light emitting diode |
| CN106328043A (en) * | 2015-06-29 | 2017-01-11 | 无锡华润矽科微电子有限公司 | Ghosting elimination circuit of LED scanning screen and LED scanning screen |
| CN107633805A (en) * | 2016-07-14 | 2018-01-26 | 上海得倍电子技术有限公司 | Controller for LED display |
| CN105873306B (en) * | 2015-01-12 | 2018-08-31 | 明阳半导体股份有限公司 | Driving system, driving circuit and scanning circuit of light emitting diode |
| CN111883049A (en) * | 2020-08-12 | 2020-11-03 | 北京集创北方科技股份有限公司 | Shadow eliminating potential adjusting method, line driving circuit and LED display device |
| CN112770443A (en) * | 2021-01-27 | 2021-05-07 | 江苏广中电子科技有限公司 | Method for solving abnormal dark and bright of light emitting diode during scanning |
| CN115527485A (en) * | 2022-10-19 | 2022-12-27 | 惠科股份有限公司 | Display panel driving method, display panel and display panel debugging method |
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| CN107633805A (en) * | 2016-07-14 | 2018-01-26 | 上海得倍电子技术有限公司 | Controller for LED display |
| CN111883049A (en) * | 2020-08-12 | 2020-11-03 | 北京集创北方科技股份有限公司 | Shadow eliminating potential adjusting method, line driving circuit and LED display device |
| WO2022032953A1 (en) * | 2020-08-12 | 2022-02-17 | 北京集创北方科技股份有限公司 | Method for adjusting shadow elimination potential, and row driving circuit and led display device |
| CN112770443A (en) * | 2021-01-27 | 2021-05-07 | 江苏广中电子科技有限公司 | Method for solving abnormal dark and bright of light emitting diode during scanning |
| CN116189608A (en) * | 2022-02-16 | 2023-05-30 | 北京大学 | Method for eliminating phenomena of caterpillar and smear and improving refresh rate of LED display screen |
| CN116189608B (en) * | 2022-02-16 | 2023-08-04 | 北京大学 | Method for eliminating phenomena of caterpillar and smear and improving refresh rate of LED display screen |
| CN115527485A (en) * | 2022-10-19 | 2022-12-27 | 惠科股份有限公司 | Display panel driving method, display panel and display panel debugging method |
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| CN117116220A (en) * | 2023-10-25 | 2023-11-24 | 中科(深圳)无线半导体有限公司 | Mini LED scanning type backlight driving chip |
| CN117116220B (en) * | 2023-10-25 | 2024-01-16 | 中科(深圳)无线半导体有限公司 | Mini LED scanning type backlight driving chip |
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