CN103165071A - System and method for removing light-emitting diode (LED) array scanning ghost shadow - Google Patents
System and method for removing light-emitting diode (LED) array scanning ghost shadow Download PDFInfo
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- CN103165071A CN103165071A CN2011104170436A CN201110417043A CN103165071A CN 103165071 A CN103165071 A CN 103165071A CN 2011104170436 A CN2011104170436 A CN 2011104170436A CN 201110417043 A CN201110417043 A CN 201110417043A CN 103165071 A CN103165071 A CN 103165071A
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Abstract
The invention discloses a system for removing a light-emitting diode (LED) array scanning ghost shadow and a method for removing the LED array scanning ghost shadow. The system comprises an LED display array and a drive device used for driving the LED display array. The drive device comprises a control unit and a drive unit, wherein the control unit and the drive unit are connected. The drive unit comprises a line input and a row output, wherein the line output is connected with a negative electrode of an LED lamp in the LED display array, and the row output is connected with a positive electrode of the LED lamp in the LED display array. The control unit controls re-change-over of delayed preset time of the line output of the drive unit when conducting scanning change-over, and the preset time is less than or equal to the scanning interval time of the drive device. Compared with the prior art, the system and the method do not need to enable any hardware to be additionally arranged so that ghost shadow removing can be completed immediately, and therefore modern technological development tendency of low cost and small size is adapted.
Description
Technical field
The present invention relates to the LED display field, relate in particular a kind of system and method for eliminating LED array scanning ghost.
Background technology
LED display has been widely used in the multimedia portable appliance and electronics such as smart mobile phone, and the content of its demonstration comprises word, image, animation and the pattern changed with music.As shown in Figure 1, LED display 100 comprises LED array of display 1 and for the drive unit 2 of driving LED array of display 1, this drive unit 2 usually has again several rows output control and the output of some row is controlled, this line output is controlled the row for driving LED array of display 1, the row for driving LED array of display 1 are controlled in row output, it is specifically based on the dynamic scan displaying principle, and carries out the scan mode work of row or column, thereby demonstrates word or the image information of required demonstration; Concrete, in Fig. 1, line output is controlled and is No. 1 and No. 2 circuits, and row output is No. 3 and No. 4 circuits, and ranks output can arrange difference and switching mutually according to the inside of drive unit in actual applications certainly.
Refer to shown in Fig. 2 the comparison diagram of the LED scanning sequence that it is LED display 100 shown in Fig. 1 and elimination residual charge, T1 in the time LED lamp 11 and the 2nd LED lamp 12 all light, and T2 time domestic demand definition the 3rd LED lamp 13 go out and the 4th LED lamp 14 for bright, it should be noted that, also have scanning gap time t between time in T1 time and T2, now all driven MOS pipes (Fig. 1 adopts PMOS pipe and NMOS pipe to come for example) are all in closed condition, please again consult Fig. 1, it gets check point on No. 4 circuits, i.e. P point, when not arranging while disappearing shadow circuit 21, in the T1 time period, due to a LED lamp 11 in the T1 time always in illuminating state, No. 4 circuits are always in high level, and due to require the 3rd LED lamp 13 in the T2 time period in extinguishing state, therefore, when entering T2 during the time period, these No. 4 circuits can be applied in low level, but due to T1 in the time No. 4 circuits at stray capacitance C
l4in residual electric charge is arranged, therefore on it, electric charge can discharge by the 3rd LED lamp 13, allow the 3rd LED lamp 13 have short-time current to pass through, the 3rd LED lamp 13 glimmers and form ghost, as Vp in Fig. 2 (t), in order to eliminate above-mentioned ghost, people are improved drive unit 2, increase and be provided with the shadow circuit 21 that disappears, this shadow circuit 21 that disappears comprises the first resistance R 1 and the second resistance R 2 that serial connection is connected, the other end ground connection of this first resistance R 1, an other end of the second resistance R 2 meets VDD, and the twice that the resistance of this second resistance R 2 is the first resistance R 1, so making the magnitude of voltage between the first resistance R 1 and the second resistance R 2 is VDD/3, please refer to Vp ' schematic diagram (t) in Fig. 2, then each circuit of LED array of display 1 all is connected between the first resistance R 1 and the second resistance R 2 by gauge tap K, so when the time enters scanning gap time t, Closed control K switch and allow noble potential point automatically realize electric discharge by the first resistance R 1, electric discharge disconnects gauge tap K after finishing again, LED array of display 1 can be worked, the voltage of ordering such as P after overdischarge will be down to VDD/3, so can't form ghost, reached the effect of eliminating ghost.
But, seen from the above description, in order to reach the purpose of the shadow that disappears, it not only needs additionally to be provided with the shadow circuit 21 that disappears, but also need increasing a plurality of gauge tap K and corresponding sequential control, its design concept with product miniaturization and simplification runs in the opposite direction, and actually needs improvement.
In view of this, the inventor is the above-mentioned defect further investigation when eliminating the scanning ghost for prior art, then has this case to produce.
Summary of the invention
The first purpose of the present invention is to provide a kind of system of eliminating LED array scanning ghost, to solve prior art, has the defect that the high and product of cost can't miniaturization when eliminating ghost.
In order to reach above-mentioned purpose, solution of the present invention is:
A kind of system of eliminating LED array scanning ghost, comprise the LED array of display and for the drive unit of driving LED array of display, wherein, this drive unit has control module and driver element, this control module is connected with driver element, this driver element has line output and row output, this line output is connected with the negative electrode of LED lamp in the LED array of display, this row output is connected with the anode of LED lamp in the LED array of display, the line output delay predetermined time that this control module is controlled driver element when scanning switching switches again, this schedule time is less than or equal to the scanning gap time of drive unit.
Further, this schedule time is more than or equal to 400ns.
The second purpose of the present invention is to provide a kind of method of eliminating LED array scanning ghost, wherein, when the scanning switching of carrying out the LED array of display, line output delay predetermined time corresponding to LED lamp cathode in the LED array of display in this drive unit switches again, and this schedule time is less than or equal to the scanning gap time of drive unit.
Further, this schedule time is more than or equal to 400ns.
After adopting said structure, a kind of system and method for eliminating LED array scanning ghost the present invention relates to, it is by allowing the line output delay predetermined time corresponding to the LED lamp cathode switch again, so make the voltage produced because of stray capacitance corresponding to the circuit on the LED array of display of row output to discharge by the LED lamp within this period schedule time, because the concrete LED lamp of the voltage of this release stray capacitance is only to extend a bit of lighting the time, therefore the present invention not only can not have influence on the display effect of whole LED display, and the ghost that can also avoid the LED array of display to produce.Compared with prior art, the present invention, without setting up any hardware, can complete ghost and eliminate, thereby has adapted to the technology trends of modern low cost and small size.
The accompanying drawing explanation
Fig. 1 is the structural representation of existing LED display when eliminating ghost;
Contrast schematic diagram before and after the LED scanning sequence that Fig. 2 is LED display shown in Fig. 1 and elimination residual charge;
Fig. 3 the present invention relates to a kind of structural representation of eliminating the system of LED array scanning ghost;
The schematic diagram of the LED scanning sequence that Fig. 4 is structure shown in Fig. 3 and elimination residual charge process.
In figure:
The one LED lamp 11 the 2nd LED lamp 12
The 3rd LED lamp 13 the 4th LED lamp 14
The drive unit 2 shadow circuit 21 that disappears
Embodiment
In order further to explain technical scheme of the present invention, below by specific embodiment, the present invention will be described in detail.It should be noted that, in this embodiment, the technical characterictic identical with background technology adopts same label.
As shown in Figure 3 and Figure 4, a kind of system of eliminating LED array scanning ghost the present invention relates to, comprise LED array of display 1 and drive unit 2, and this drive unit 2 is for driving LED array of display 1.
This drive unit 2 has control module 22 and driver element 23, this control module 22 is connected with driver element 23, this driver element 23 has line output 231 and row output 232, this line output 231 is connected with the negative electrode of LED lamp in LED array of display 1, and this row output 232 is connected with the anode of LED lamp in LED array of display 1; Core of the present invention is: when scanning switching, line output 231 delay predetermined times that this control module 22 is controlled driver element 23 switch again, and this schedule time is less than or equal to the scanning gap time of drive unit 2.Preferably, this schedule time is more than or equal to 400ns.
In addition, the present invention also provides a kind of method of eliminating LED array scanning ghost, the method is: when the scanning switching of carrying out LED array of display 1, line output 231 delay predetermined times in this drive unit 2 switch again, specifically it is to define compared to traditional switching time, this schedule time need not be limited because the voltage of stray capacitance can not cause the LED lamp to produce ghost to guarantee, it specifically can adjust setting according to the thing situation, but it all needs to be less than or equal to the scanning gap time of drive unit 2.
Like this, a kind of system and method for eliminating LED array scanning ghost the present invention relates to, it is by allowing line output 231 delay predetermined times corresponding to the LED lamp cathode switch again, so make the voltage produced because of stray capacitance corresponding to the circuit on the LED array of display 1 of row output 232 to discharge by the LED lamp within this period schedule time, due to the concrete LED lamp of the voltage of this release stray capacitance be before in the LED of illuminating state lamp, therefore it is only to extend a bit of lighting the time, therefore the present invention not only can not have influence on the display effect of whole LED display 100, and because the release of electric charge can also be avoided LED array of display 1 generation ghost.
In sum, the present invention compared with prior art, without setting up any hardware, can complete ghost and eliminate, thereby has adapted to the technology trends of modern low cost and small size.
It should be noted that, this line output 231 and row output 232 are only a kind of pro forma definition, it can change with the current control of control module 22 when practical application, be that line output 231 can change to row output 232, whether row output 232 changes to line output 231, according to being connected and determining whether as line output 231 with the negative electrode of LED lamp.
Above-described embodiment and graphic and non-limiting product form of the present invention and style, suitable variation or modification that any person of an ordinary skill in the technical field does it, all should be considered as not breaking away from patent category of the present invention.
Claims (4)
1. eliminate the system that LED array scans ghost for one kind, comprise the LED array of display and for the drive unit of driving LED array of display, it is characterized in that, this drive unit has control module and driver element, this control module is connected with driver element, this driver element has line output and row output, this line output is connected with the negative electrode of LED lamp in the LED array of display, this row output is connected with the anode of LED lamp in the LED array of display, the line output delay predetermined time that this control module is controlled driver element when scanning switching switches again, this schedule time is less than or equal to the scanning gap time of drive unit.
2. a kind of system of eliminating LED array scanning ghost as claimed in claim 1, is characterized in that, this schedule time is more than or equal to 400ns.
3. eliminate the method that LED array scans ghost for one kind, it is characterized in that, when the scanning switching of carrying out the LED array of display, line output delay predetermined time corresponding to LED lamp cathode in the LED array of display in this drive unit switches again, and this schedule time is less than or equal to the scanning gap time of drive unit.
4. a kind of method of eliminating LED array scanning ghost as claimed in claim 3, is characterized in that, this schedule time is more than or equal to 400ns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104170436A CN103165071A (en) | 2011-12-14 | 2011-12-14 | System and method for removing light-emitting diode (LED) array scanning ghost shadow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104170436A CN103165071A (en) | 2011-12-14 | 2011-12-14 | System and method for removing light-emitting diode (LED) array scanning ghost shadow |
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| CN103165071A true CN103165071A (en) | 2013-06-19 |
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| CN2011104170436A Pending CN103165071A (en) | 2011-12-14 | 2011-12-14 | System and method for removing light-emitting diode (LED) array scanning ghost shadow |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103903566A (en) * | 2014-04-22 | 2014-07-02 | 西安电子科技大学 | LED display circuit with LED stray capacitor for discharging |
| CN105096829A (en) * | 2015-08-18 | 2015-11-25 | 青岛海信电器股份有限公司 | Ghost shadow elimination method and device and displayer |
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| CN1442842A (en) * | 2002-03-06 | 2003-09-17 | 胜园科技股份有限公司 | Driving method of passive organic luminuous dipolar object display apparatus |
| CN1961345A (en) * | 2004-03-30 | 2007-05-09 | 富士胶片株式会社 | Light emission panel display device |
| CN101004894A (en) * | 2006-10-20 | 2007-07-25 | 北京巨数数字技术开发有限公司 | Scan type LED display unit, and method for eliminating latent brightness of previous line |
| CN102231258A (en) * | 2011-05-30 | 2011-11-02 | 杭州士兰控股有限公司 | Method and system for eliminating mura of LED dynamic display |
| CN202434184U (en) * | 2011-12-14 | 2012-09-12 | 矽恩微电子(厦门)有限公司 | System eliminating LED (light-emitting diode) array scanning ghost shadow |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1442842A (en) * | 2002-03-06 | 2003-09-17 | 胜园科技股份有限公司 | Driving method of passive organic luminuous dipolar object display apparatus |
| CN1961345A (en) * | 2004-03-30 | 2007-05-09 | 富士胶片株式会社 | Light emission panel display device |
| CN101004894A (en) * | 2006-10-20 | 2007-07-25 | 北京巨数数字技术开发有限公司 | Scan type LED display unit, and method for eliminating latent brightness of previous line |
| CN102231258A (en) * | 2011-05-30 | 2011-11-02 | 杭州士兰控股有限公司 | Method and system for eliminating mura of LED dynamic display |
| CN202434184U (en) * | 2011-12-14 | 2012-09-12 | 矽恩微电子(厦门)有限公司 | System eliminating LED (light-emitting diode) array scanning ghost shadow |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103903566A (en) * | 2014-04-22 | 2014-07-02 | 西安电子科技大学 | LED display circuit with LED stray capacitor for discharging |
| CN103903566B (en) * | 2014-04-22 | 2016-02-10 | 西安电子科技大学 | Use the LED display circuit of LED parasitic capacitance discharge |
| CN105096829A (en) * | 2015-08-18 | 2015-11-25 | 青岛海信电器股份有限公司 | Ghost shadow elimination method and device and displayer |
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Application publication date: 20130619 |