CN102262862A - Light source system and light emitting diode driving method for improving electrostatic discharge capacity - Google Patents
Light source system and light emitting diode driving method for improving electrostatic discharge capacity Download PDFInfo
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- CN102262862A CN102262862A CN2011102144598A CN201110214459A CN102262862A CN 102262862 A CN102262862 A CN 102262862A CN 2011102144598 A CN2011102144598 A CN 2011102144598A CN 201110214459 A CN201110214459 A CN 201110214459A CN 102262862 A CN102262862 A CN 102262862A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000003068 static effect Effects 0.000 claims description 27
- 238000007599 discharging Methods 0.000 claims description 20
- 230000000694 effects Effects 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 7
- 230000001052 transient effect Effects 0.000 description 6
- CNQCVBJFEGMYDW-UHFFFAOYSA-N lawrencium atom Chemical compound [Lr] CNQCVBJFEGMYDW-UHFFFAOYSA-N 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000005764 inhibitory process Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 1
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Abstract
A light source system and a driving method of light emitting diodes are provided. The light source system provided by the invention comprises a light emitting diode module and a driving unit. The light emitting diode module is provided with at least one light emitting diode string, and the light emitting diode string is operated under a direct current output voltage. The driving unit is coupled to the light emitting diode module and used for providing the direct current output voltage. The driving unit also drives the light emitting diode string according to a setting signal, and determines whether to provide an electrostatic discharge path to discharge an electrostatic discharge current caused by an electrostatic discharge event in response to comparison between a voltage drop of the light emitting diode string and a preset reference voltage. The invention can reduce the whole manufacturing cost and can realize the protection of electrostatic discharge.
Description
Technical field
The present invention relates to a kind of light-source system, relate in particular to a kind of light-source system and driving method of light emitting diode.
Background technology
In recent years, along with semiconductor science and technology is flourish, portable type electronic product and flat-panel screens product also rise thereupon.And in the middle of the type of numerous flat-panel screens, (liquid crystal display LCD) based on advantage such as its low voltage operating, radiationless line scattering, in light weight and volume be little, has become the main flow of each display product to LCD immediately.Generally speaking, because display panels itself does not have self luminous characteristic, therefore must below display panels, place backlight module, so as to providing display panels required (back of the body) light source.
Traditional backlight module roughly can be divided into two classes, the first is by cold-cathode tube (cold cathode fluorescent lamp, CCFL) backlight module of being formed, another is then by light emitting diode (light emitting diode, the LED) backlight module of being formed.Wherein, because light-emitting diode (LED) backlight module can promote the colour gamut (color gamut) of LCD, so each tame panel dealer replaces the cold-cathode tube backlight module with light-emitting diode (LED) backlight module mostly now.
Light-emitting diode (LED) backlight module has the light emitting diode string (LED strings) that many groups are in juxtaposition, and each light emitting diode string is made up of a plurality of light emitting diodes that are serially connected.On the practice, each light emitting diode string can operate under the direct current output voltage (DC output voltage), and is driven the driving of wafer (driver IC) and luminous.Yet, owing to each light emitting diode string can link together with the driving wafer by connector (connector), so when carrying out electrostatic discharge testing (ESD test), be easier to produce the electrostatic discharge testing result of failure.
And in order to solve such problem, generally can between the outside of each light emitting diode string and driving wafer, suppress diode (transient voltage suppression diode by the extra transient voltage that adds, TVS diode), so as to success ratio that promotes the electrostatic discharge testing result and the protection that realizes static discharge.Yet, shortcoming is exactly in response to the demand of large size panel now, the sum of the light emitting diode string that is disposed in the light-emitting diode (LED) backlight module will be many more, so the quantity of the transient voltage inhibition diode that need additionally add will be many more, and then increase cost of manufacture.
Summary of the invention
In view of this, the present invention proposes a kind of light-source system and LED driving method, so as to improving the problem that prior art is addressed effectively.
One embodiment of the invention provides a kind of light-source system, and it comprises light-emitting diode (LED) module and driver element.Light-emitting diode (LED) module has at least one light emitting diode string, and described light emitting diode string operates under the direct current output voltage.Driver element couples light-emitting diode (LED) module, in order to described VD to be provided.Wherein, driver element also according to a setting signal driving described light emitting diode string, and react on the comparison of the pressure drop of described light emitting diode string and a preset reference voltage and determine whether provide an electrostatic discharging path.
In one embodiment of the invention, driver element comprises buck circuit, driver, and the static discharge unit.Wherein, the buck circuit couples the anode of described light emitting diode string, in order to receiving a direct current input voltage, and described DC input voitage is boosted or step-down is handled the back and produced described VD.Driver is coupled between the negative electrode and earthing potential of described light emitting diode string, in order to according to described setting signal to drive described light emitting diode string, and provide one to feed back signal to the buck circuit according to this, thereby make the buck circuit react on described feedback signal to adjust described VD.The static discharge unit couples the negative electrode of described light emitting diode string, in order to the pressure drop and the described preset reference voltage of more described light emitting diode string, whether provides described electrostatic discharging path so as to decision.
Another embodiment of the present invention provides a kind of LED driving method that drives at least one light emitting diode string that is applicable to, it comprises: provide a direct current output voltage to described light emitting diode string; According to a setting signal to drive described light emitting diode string; And react on the comparison of the pressure drop of described light emitting diode string and preset reference voltage and determine whether provide electrostatic discharging path.
In one embodiment of the invention,, then provide described electrostatic discharging path when the pressure drop that compares described light emitting diode string during greater than described preset reference voltage.Otherwise,, then stop to provide described electrostatic discharging path when the pressure drop that compares described light emitting diode string during less than described preset reference voltage.
Based on above-mentioned, the present invention mainly is the static discharge unit that directly disposes comparing function in the driver element (can be considered and drive wafer) in order to driven for emitting lights diode string, so as to when having electrostatic discharge event to take place, provide an electrostatic discharging path to lead the static discharge current that is caused by electrostatic discharge event fast off.Thus, because having the static discharge unit of comparing function can directly be configured in the driving wafer, so compared to the practice (the also promptly extra mode that adds transient voltage inhibition diode) in the past, not only can reduce whole cost of manufacture, but also can realize the protection of static discharge.
Will be appreciated that above-mentioned general description and following embodiment only are exemplary and illustrative, it can not limit the scope that institute of the present invention desire is advocated.
Description of drawings
Following appended accompanying drawing is the part of instructions of the present invention, shows example embodiment of the present invention, and appended accompanying drawing illustrates principle of the present invention with the description of instructions.
Fig. 1 is depicted as the process flow diagram of the light-source system 10 of one embodiment of the invention.
Fig. 2 is depicted as the synoptic diagram of the static discharge unit 109 of one embodiment of the invention.
Fig. 3 is depicted as the process flow diagram of the LED driving method of one embodiment of the invention.
Wherein, description of reference numerals is as follows:
10: light-source system
101: light-emitting diode (LED) module
103: driver element
105: the buck circuit
107: driver
109: the static discharge unit
LED: light emitting diode string
CMP: comparer
SW (N transistor npn npn): switch
Vin: DC input voitage
Vout: VD
ST: setting signal
FB: feedback signal
VDN: the pressure drop of light emitting diode string
Vref: preset reference voltage
CS1: first comparison signal
CS2: second comparison signal
Ad: the anode of light emitting diode string
Cd: the negative electrode of light emitting diode string
ESD_I: static discharge current
S301～S305: each step of the process flow diagram of the LED driving method of one embodiment of the invention
Embodiment
Now will the example of described one exemplary embodiment be described in the accompanying drawings in detail with reference to one exemplary embodiment of the present invention.In addition, all possibility parts use element/member of same numeral to represent identical or similar portions in drawings and the embodiments.
Fig. 1 is depicted as the synoptic diagram of the light-source system (light source system) 10 of one embodiment of the invention.Please refer to Fig. 1, the light-source system 10 of present embodiment can be the light-emitting diode (LED) backlight module (LED backlight module) that is applicable to that liquid crystal display systems (LCD system) is central, but be not restricted to this, and it includes light-emitting diode (LED) module (LED module) 101 and driver element (driving unit) 103.Wherein, light-emitting diode (LED) module 101 has at least one group and is connected in series light emitting diode string (LED string) LED that forms by a plurality of light emitting diode, and this light emitting diode string LED operates under VD (the DC output voltage) Vout.
In present embodiment, driver element 103 can be that one drives wafer (driver IC), and it comprises buck circuit (boost-buck circuit) 105, driver (driver) 107, and static discharge unit (ESD unit) 109.Wherein, buck circuit 105 couples anode (anode) Ad of light emitting diode string LED, in order to receiving DC input voitage (DC input voltage) Vin, and DC input voitage Vin boosted or step-down is handled (boost/buck processing) back and produced VD Vout.Also be, as DC input voitage Vin during less than the required operating voltage of light emitting diode string LED, then buck circuit 105 can be to DC input voitage Vin processings of boosting, so as to generation and provide suitable VD Vout to light emitting diode string LED; Otherwise, as DC input voitage Vin during greater than the required operating voltage of light emitting diode string LED, then buck circuit 105 can carry out step-down to DC input voitage Vin and handles, so as to producing and providing suitable VD Vout to light emitting diode string LED.
In addition, switch SW couples comparator C MP, determines in order to react on the first comparison signal CS1 that comparator C MP exports or the second comparison signal CS2 whether conducting is to form electrostatic discharging path.And switch SW can be realized by N transistor npn npn (N-type transistor), and N type metal oxide semiconductor (NMOS) transistor for example, but be not restricted to this is so followingly rename as N transistor npn npn SW with switch SW.Wherein, the grid (gate) of N transistor npn npn SW couples the output terminal of comparator C MP, and the source electrode (source) of N transistor npn npn SW is coupled to earthing potential, and the drain electrode (drain) of N transistor npn npn SW then couples the negative electrode Cd of light emitting diode string LED.
In present embodiment, the pressure drop VDN that compares light emitting diode string LED as comparator C MP is during less than preset reference voltage Vref, and then comparator C MP can export the first comparison signal CS1 (for example logic low).Thus, N transistor npn npn (switch) SW will react on the first comparison signal CS1 and close (turn off).In addition, the pressure drop VDN that compares light emitting diode string LED as comparator C MP is during greater than preset reference voltage Vref, and then comparator C MP can export the second comparison signal CS2 (for example logic high).Thus, N transistor npn npn (switch) SW will react on the second comparison signal CS2 and conducting (turn on).
Clearer, during the running of light-source system 10, when not having electrostatic discharge event to take place, because the pressure drop VDN of light emitting diode string LED can't be subjected to the influence of electrostatic discharge event and lifting significantly, thus this moment light emitting diode string LED pressure drop VDN can be less than preset reference voltage Vref.Therefore, comparator C MP will export the first comparison signal CS1 with logic low and closes to cause N transistor npn npn (switch) SW.On the other hand, during the running of light-source system 10, when electrostatic discharge event takes place because the pressure drop VDN of light emitting diode string LED can be subjected to the influence of electrostatic discharge event and lifting significantly, so this moment light emitting diode string LED pressure drop VDN can be greater than preset reference voltage Vref.Therefore, comparator C MP will export have logic high the second comparison signal CS2 to cause N transistor npn npn (switch) SW conducting.
Can seem, during the running of light-source system 10, when electrostatic discharge event takes place, then comparator C MP can cause N transistor npn npn (switch) SW conducting forming/to provide an electrostatic discharging path, and then leads the static discharge current ESD_I that caused by electrostatic discharge event fast off to earthing potential.Thus; can protect the inner member (not shown) of driver 107, and then be able to realize the protection of static discharge with the exterior static discharge protective element (not shown) that general design is gone into (I/O) in the output of driver element 103 (also promptly driving wafer).In addition,, static discharge unit 109 drives in the wafer, so, can also reduce cost of manufacture significantly compared in the past the practice (also promptly extra add the mode that transient voltage suppresses diode) because can directly being configured in.
Disclose/content of teaching based on the foregoing description, Fig. 3 is depicted as the process flow diagram of the LED driving method of one embodiment of the invention.Please refer to Fig. 3, the LED driving method of present embodiment is suitable for driving at least one light emitting diode string, and it comprises: provide VD to light emitting diode string (step S301); According to setting signal with driven for emitting lights diode string (step S303); And react on the comparison of the pressure drop of light emitting diode string and preset reference voltage and determine whether to provide electrostatic discharging path (step S305).
In present embodiment, when the pressure drop that compares light emitting diode string during greater than preset reference voltage, then expression has the generation of electrostatic discharge event, so provides electrostatic discharging path with need, so as to leading the static discharge current that is caused by electrostatic discharge event off; Otherwise when the pressure drop that compares light emitting diode string during less than preset reference voltage, then expression does not have the generation of electrostatic discharge event, so need is stopped to provide electrostatic discharging path, so as to avoiding influencing the driving of light emitting diode string.
In sum, the present invention mainly is the static discharge unit that directly disposes comparing function in the driving wafer in order to driven for emitting lights diode string, so as to when having electrostatic discharge event to take place, provide an electrostatic discharging path to lead the static discharge current that is caused by electrostatic discharge event fast off.Thus, because having the static discharge unit of comparing function can directly be configured in the driving wafer, so compared to the practice (the also promptly extra mode that adds transient voltage inhibition diode) in the past, not only can reduce whole cost of manufacture, but also can realize the protection of static discharge.In addition, any design, manufacturing or with similar in driving wafer directly configuration have comparing function the static discharge unit to realize the means of electrostatic discharge protective, all belong to the category of institute of the present invention desire protection.
Though the present invention discloses as above with embodiment; right its is not in order to limit the present invention; any those of ordinary skills; without departing from the spirit and scope of the present invention; when doing a little change and retouching, so protection scope of the present invention is as the criterion when looking appended the scope that claim defined.In addition, arbitrary embodiment of the present invention or scope of patent protection must not reached the disclosed whole purposes of the present invention or advantage or characteristics.In addition, summary part and title only are the usefulness that is used for assisting the patent document search, are not to be used for limiting interest field of the present invention.
Claims (9)
1. light-source system comprises:
One light-emitting diode (LED) module has at least one light emitting diode string, and this light emitting diode string operates under the direct current output voltage; And
One driver element, couple this light-emitting diode (LED) module, in order to this VD to be provided, wherein this driver element also according to a setting signal driving this light emitting diode string, and react on the comparison of pressure drop of this light emitting diode string and a preset reference voltage and determine whether provide an electrostatic discharging path.
2. light-source system as claimed in claim 1, wherein this driver element comprises:
One buck circuit couples the anode of this light emitting diode string, in order to receiving a direct current input voltage, and this DC input voitage is boosted or step-down is handled the back and produced this VD;
One driver, be coupled between the negative electrode and an earthing potential of this light emitting diode string, in order to according to this setting signal to drive this light emitting diode string, and provide one to feed back signal to this buck circuit according to this, thereby make this buck circuit react on this feedback signal to adjust this VD; And
One static discharge unit couples the negative electrode of this light emitting diode string, in order to relatively this pressure drop and this preset reference voltage, whether provides this electrostatic discharging path so as to decision.
3. light-source system as claimed in claim 2, wherein this static discharge unit comprises:
One comparer is in order to relatively this pressure drop and this preset reference voltage, so as to exporting one first comparison signal or one second comparison signal; And
One switch couples this comparer, in order to react on this first or this second comparison signal and determine whether conducting is to form this electrostatic discharging path.
4. light-source system as claimed in claim 3, wherein when this comparer compared this pressure drop less than this preset reference voltage, then this comparer was exported this first comparison signal; And when this comparer compared this pressure drop greater than this preset reference voltage, then this comparer was exported this second comparison signal.
5. light-source system as claimed in claim 4, wherein
This on-off effect is closed in this first comparison signal; And
This on-off effect is in this second comparison signal and conducting.
6. light-source system as claimed in claim 5, wherein this switch is a N transistor npn npn,
Wherein, the grid of this N transistor npn npn couples the output terminal of this comparer, and the source electrode of this N transistor npn npn is coupled to this earthing potential, and the drain electrode of this N transistor npn npn then couples the negative electrode of this light emitting diode string.
7. light-source system as claimed in claim 1, wherein this light-source system is at least a light-emitting diode (LED) backlight module.
8. LED driving method be suitable for driving at least one group of light emitting diode string, and this LED driving method comprises:
Provide a direct current output voltage to this light emitting diode string;
According to a setting signal to drive this light emitting diode string; And
React on the comparison of pressure drop of this light emitting diode string and a preset reference voltage and determine whether provide an electrostatic discharging path.
9. LED driving method as claimed in claim 8, wherein
When comparing this pressure drop, then provide this electrostatic discharging path greater than this preset reference voltage; And
When comparing this pressure drop, then stop to provide this electrostatic discharging path less than this preset reference voltage.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW100110158A TWI442816B (en) | 2011-03-24 | 2011-03-24 | Light source system and method for driving light emitting diodes in order to promote esd capability |
| TW100110158 | 2011-03-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102262862A true CN102262862A (en) | 2011-11-30 |
| CN102262862B CN102262862B (en) | 2014-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110214459.8A Expired - Fee Related CN102262862B (en) | 2011-03-24 | 2011-07-26 | Light source system and light emitting diode driving method for improving electrostatic discharge capacity |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102262862B (en) |
| TW (1) | TWI442816B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102750920A (en) * | 2012-07-02 | 2012-10-24 | 深圳市华星光电技术有限公司 | LED (Light emitting diode) backlight driving circuit, backlight module and liquid crystal display device |
| US8680780B2 (en) | 2012-07-02 | 2014-03-25 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | LED backlight driving circuit, backlight module, and LCD device |
| CN110706586A (en) * | 2019-03-25 | 2020-01-17 | 友达光电股份有限公司 | Backlight device and display device |
| CN110875306A (en) * | 2018-08-30 | 2020-03-10 | 台湾积体电路制造股份有限公司 | Electrostatic discharge (ESD) protection circuit and method for protecting from ESD |
| US11670900B2 (en) | 2019-02-05 | 2023-06-06 | Emergency Technology, Inc. | Universal smart adaptor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11043487B2 (en) | 2018-08-30 | 2021-06-22 | Taiwan Semiconductor Manufacturing Company Ltd. | ESD protection circuit, semiconductor system including same, and method for operating same |
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| CN101086571A (en) * | 2006-06-07 | 2007-12-12 | Lg.菲利浦Lcd株式会社 | Backlight driving apparatus of liquid crystal display and method for driving backlight driving apparatus |
| CN101281314A (en) * | 2008-05-20 | 2008-10-08 | 友达光电股份有限公司 | LCD device with electro-static discharge protection function |
| US20090322252A1 (en) * | 2008-06-30 | 2009-12-31 | Green Solution Technology Inc. | Led driving circuit and a mosfet switch module thereof |
| US20100141163A1 (en) * | 2008-12-09 | 2010-06-10 | Samsung Electronics Co., Ltd. | Method of driving a light source, light source apparatus for performing the method and display apparatus having the light source apparatus |
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2011
- 2011-03-24 TW TW100110158A patent/TWI442816B/en not_active IP Right Cessation
- 2011-07-26 CN CN201110214459.8A patent/CN102262862B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101086571A (en) * | 2006-06-07 | 2007-12-12 | Lg.菲利浦Lcd株式会社 | Backlight driving apparatus of liquid crystal display and method for driving backlight driving apparatus |
| CN101281314A (en) * | 2008-05-20 | 2008-10-08 | 友达光电股份有限公司 | LCD device with electro-static discharge protection function |
| US20090322252A1 (en) * | 2008-06-30 | 2009-12-31 | Green Solution Technology Inc. | Led driving circuit and a mosfet switch module thereof |
| US20100141163A1 (en) * | 2008-12-09 | 2010-06-10 | Samsung Electronics Co., Ltd. | Method of driving a light source, light source apparatus for performing the method and display apparatus having the light source apparatus |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102750920A (en) * | 2012-07-02 | 2012-10-24 | 深圳市华星光电技术有限公司 | LED (Light emitting diode) backlight driving circuit, backlight module and liquid crystal display device |
| US8680780B2 (en) | 2012-07-02 | 2014-03-25 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | LED backlight driving circuit, backlight module, and LCD device |
| CN110875306A (en) * | 2018-08-30 | 2020-03-10 | 台湾积体电路制造股份有限公司 | Electrostatic discharge (ESD) protection circuit and method for protecting from ESD |
| US11670900B2 (en) | 2019-02-05 | 2023-06-06 | Emergency Technology, Inc. | Universal smart adaptor |
| CN110706586A (en) * | 2019-03-25 | 2020-01-17 | 友达光电股份有限公司 | Backlight device and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102262862B (en) | 2014-07-16 |
| TW201240518A (en) | 2012-10-01 |
| TWI442816B (en) | 2014-06-21 |
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