CN202855274U - Time-sequence control circuit, backlight scanning driving system and backlight source - Google Patents
Time-sequence control circuit, backlight scanning driving system and backlight source Download PDFInfo
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- CN202855274U CN202855274U CN 201220504492 CN201220504492U CN202855274U CN 202855274 U CN202855274 U CN 202855274U CN 201220504492 CN201220504492 CN 201220504492 CN 201220504492 U CN201220504492 U CN 201220504492U CN 202855274 U CN202855274 U CN 202855274U
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- backlight
- control circuit
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- circuit
- drive system
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Abstract
The utility model relates to the technical field of liquid crystal display, in particular, relates to a time-sequence control circuit and a backlight scanning driving system and a backlight source. The object of the utility model is to improve the stability of the backlight scanning driving system. The utility model discloses the time-sequence control circuit. The time-sequence control circuit includes a memory which stores LED light bar driving information written by a communication protocol of a register in a corresponding LED backlight driving circuit, and a time sequence generator which is connected with the memory and generates time-sequence control instructions according to the driving information stored in the memory. The time-sequence control circuit can be applied to the backlight scanning driving system, such that the backlight source can be lit in a zoning manner without a single chip microcomputer circuit required, and therefore, cost can be saved, and the stability of the backlight scanning driving system can be improved.
Description
Technical field
The utility model relates to technical field of liquid crystal display, relates in particular to a kind of scan drive system backlight and backlight.
Background technology
Along with the raising of living standards of the people, the demand of large scale liquid crystal display increases day by day, and the user also has higher requirement for image quality, energy-conserving and environment-protective simultaneously.The large scale liquid crystal module refers to that liquid crystal panel is cornerwise and is of a size of more than 46 cun and 46 cun that existing large scale liquid crystal module generally comprises: liquid crystal panel and be installed in backlight on the liquid crystal panel; Wherein lighting of backlight is that driving circuit by being installed on the backlight is realized, but liquid crystal panel the trailing smear phenomenon can occur when the object that shows fast moving or picture high-frequency are switched, affect image quality and viewing effect.
In order to alleviate liquid crystal module showing dynamic menu trailing smear phenomenon, backlight is divided into several districts, then subregion is lighted backlight under the control of scan drive system backlight.
Existing scan drive system backlight comprises: sequential control circuit, single chip circuit, LED(Light Emitting Diode, light emitting diode) backlight drive circuit etc.
Single chip circuit receives the instruction that sequential control circuit sends, and sends instruction and data according to the data of single chip circuit self register-stored and lights backlight to LED-backlit driving circuit subregion.That is to say, storing the instruction and data that all give the LED-backlit driving circuit in the single chip circuit, single chip circuit treats that sequential control circuit issues an order, and namely orders the LED-backlit drive circuit works.
But because single chip circuit has higher failure rate in the course of the work, particularly in the relatively high situation of power drives plate voltage, will affect the stability of scan drive system backlight.
Therefore, how to provide a kind of sequential control circuit, scan drive system backlight and backlight, the realization subregion is lighted backlight, and has the stability of higher scan drive system backlight, becomes those skilled in the art's technical issues that need to address.
The utility model content
The utility model provides a kind of sequential control circuit, scan drive system backlight and backlight, is used for improving the stability of scan drive system backlight.
For achieving the above object, the utility model provides following technical scheme:
The utility model provides a kind of sequential control circuit, comprising:
Store the storer of the LED lamp bar activation bit that the communications protocol of register in the corresponding LED-backlit driving circuit writes;
And link to each other with described storer, produce the timing sequencer of sequential control instruction according to the activation bit in the described storer.
The utility model also provides a kind of scan drive system backlight, comprising: above-mentioned sequential control circuit, and be connected the LED-backlit driving circuit of LED lamp bar duty in the control backlight with the timing sequencer of described sequential control circuit.
Preferably, above-mentioned scan drive system backlight further comprises:
The DC-DC booster circuit that is connected with the LED lamp bar;
Be connected to the feedback control circuit between described LED-backlit driving circuit and the described DC-DC booster circuit.
Preferably, be connected by serial peripheral equipment interface SPI between described sequential control circuit and the described LED-backlit driving circuit.
Preferably, described LED lamp bar is a plurality of.
The utility model further provides a kind of backlight, comprises previously described scan drive system backlight, and the LED lamp bar that passes through described scan drive system control backlight.
Preferably, described backlight is direct-light-type backlight or side-light type back light.
From such scheme as can be known, the sequential control circuit that the utility model provides is because the LED lamp bar activation bit that the memory stores of sequential control circuit has the communications protocol of register in the corresponding LED-backlit driving circuit to write; Timing sequencer can directly produce the sequential control instruction according to the activation bit in the described storer.When sequential control circuit that the utility model provides is applied to not need to arrange single chip circuit in the scan drive system backlight, reduce to rise this, and improved the stability of scan drive system backlight.
In the scan drive system backlight that the utility model provides, utilize sequential control circuit as the core devices of control LED lamp bar duty, sequential control circuit directly triggers LED lamp bar in the LED-backlit driving circuit control backlight, and the realization subregion is lighted backlight; Further scheme stores the LED lamp bar activation bit that the communications protocol of register in the corresponding LED-backlit driving circuit is write in sequential control circuit, produce the sequential control instruction according to described activation bit.The LED-backlit driving circuit is according to the sequential control instruction control LED lamp bar of described sequential control circuit, thus the lightening LED lamp bar; Simultaneously, the LED-backlit driving circuit detects current just at the actual inflow current information of luminous LED lamp bar and send to feedback control circuit, feedback control circuit receives the LED-backlit driving circuit and detects current just at the actual inflow current information of luminous LED lamp bar, if inflow current is excessive, then control DC-DC booster circuit and reduce output voltage, if inflow current is too small, then control DC-DC booster circuit and increase output voltage, be that feedback control circuit can be adjusted in real time DC-DC booster circuit 240 according to the actual inflow size of current of LED lamp bar and boosts or step-down, make LED lamp bar reach corresponding bright.Compared with prior art, in the scan drive system backlight that the utility model provides, because not needing to arrange single chip circuit, thereby significantly improved the stability of scan drive system backlight.
Description of drawings
Fig. 1 is the synoptic diagram of the described sequential control circuit of the utility model embodiment;
Fig. 2 is the synoptic diagram of the described scan drive system backlight of the utility model embodiment.
Embodiment
Existing scan drive system backlight comprises: sequential control circuit, single chip circuit, supply convertor circuit, LED-backlit driving circuit; Because single-chip microcomputer has higher failure rate in the course of the work, particularly in the situation that voltage is relatively high on the power drives plate, have a strong impact on the stability of scan drive system backlight.
In view of this, the utility model provides a kind of improved technical scheme, in scan drive system backlight, single chip circuit is not set, and sequential control circuit is directly controlled the LED-backlit driving circuit, thereby has improved the stability of scan drive system backlight.
In order to make those skilled in the art better understand the technical solution of the utility model, below in conjunction with Figure of description the utility model embodiment is described in detail.
Referring to Fig. 1, this figure is the synoptic diagram of the described sequential control circuit of the utility model embodiment.
The described sequential control circuit 210 of the utility model embodiment specifically can comprise:
Timing sequencer 12 links to each other with described storer 11, produces the sequential control instruction according to the activation bit in the described storer 11.
The sequential control circuit 210 that the utility model provides is because the storer 11 of sequential control circuit 210 stores the LED lamp bar activation bit that the communications protocol of register in the corresponding LED-backlit driving circuit is write; Timing sequencer 12 can directly produce the sequential control instruction according to the activation bit in the described storer 11.When sequential control circuit 210 that the utility model provides is applied to not need to arrange single chip circuit in the scan drive system backlight, reduce to rise this, and improved the stability of scan drive system backlight.
When the sequential control circuit that the utility model provides is applied to scan drive system backlight, referring to Fig. 2, specifically can connect by serial peripheral equipment interface SPI between sequential control circuit 210 and the LED-backlit driving circuit 220, can realize synchronous serial-data transmission between sequential control circuit 210 and the LED-backlit driving circuit 220, increase the communication efficiency between sequential control circuit 210 and the LED-backlit driving circuit 220.
The scan drive system a kind of backlight that the utility model embodiment provides specifically can comprise: sequential control circuit 210 and LED-backlit driving circuit 220.
Timing sequencer 12 links to each other with described storer, produces the sequential control instruction according to the activation bit in the described storer.
The LED-backlit driving circuit is connected with the timing sequencer 12 of described sequential control circuit 210, obtains the sequential control instruction that timing sequencer 12 generates, and is used for control backlight LED lamp bar duty.
More particularly, the LED lamp bar activation bit that the communications protocol that storing in the storer 11 needs register in the direct corresponding LED-backlit driving circuit 220 is write, timing sequencer produces image information generation LED lamp bar 10 activation bits that the sequential control instruction is namely inputted according to LED lamp bar activation bit, wherein, the activation bit of LED lamp bar 10 mainly comprises the data messages such as the work schedule of LED lamp bar and inflow current size, and the sweep frequency of LED lamp bar 10 is consistent with the gate line sweep frequency that sequential control circuit 210 offers display screen, and namely the work schedule of LED lamp bar 10 is consistent with the gate line sweep frequency of display screen.LED-backlit driving circuit 220 can directly read the sequential control instruction that timing sequencer 12 produces, and LED-backlit driving circuit 220 is determined the work schedule of LED lamp bar 10 and the size of inflow current according to the sequential control instruction of reading.
In other words, sequential control circuit 210 writes the activation bit of LED lamp bar 10 respectively in the corresponding registers of LED-backlit driving circuit 220, and trigger LED-backlit driving circuit 220 and read, thereby the duty of control LED lamp bar 10, namely control respectively the duty of a plurality of LED lamp bars, the realization subregion is lighted backlight.
The scan drive system backlight that the utility model provides is because the storer 11 of the sequential control circuit 210 in the scan drive system backlight stores the LED lamp bar activation bit that the communications protocol of register in the corresponding LED-backlit driving circuit is write; Timing sequencer 12 can directly produce the sequential control instruction according to the activation bit in the described storer 11, and the LED-backlit driving circuit obtains the sequential control instruction that timing sequencer 12 generates, and is used for control backlight LED lamp bar duty.In the described scan drive system backlight of the utility model embodiment, do not need to arrange single chip circuit, reduce rising this, and improved the stability of scan drive system backlight.
The scan drive system a kind of backlight that the utility model embodiment provides specifically can comprise: sequential control circuit 210, LED-backlit driving circuit 220, feedback control circuit 230 and DC-DC booster circuit 240.
Timing sequencer 12 links to each other with described storer, produces the sequential control instruction according to the activation bit in the described storer.
The timing sequencer 12 of sequential control circuit 210 is connected with LED-backlit driving circuit 220, and sequential control circuit 210 is directly to LED-backlit driving circuit 220 transmission timing steering orders.
LED-backlit driving circuit 220 connects respectively the LED lamp bar 10 of demand motive in feedback control circuit 230 and the backlight, feedback control circuit 230 is connected between LED-backlit driving circuit 220 and the DC-DC booster circuit 240, and DC-DC booster circuit 240 connects LED lamp bar 10.
LED lamp bar 10 can be for a plurality of.
In the present embodiment, for improving the stability of scan drive system backlight, save single chip circuit of the prior art, with the core devices of sequential control circuit 210 as control LED lamp bar 10 duties, sequential control circuit 210 directly triggers LED lamp bar 10 in the LED-backlit driving circuit 220 control backlights, and the realization subregion is lighted backlight.
More particularly, can store LED lamp bar 10 activation bits in that sequential control circuit 210 is interior, and the activation bit of sequential control circuit 210 needs register and communications protocol in the corresponding LED-backlit driving circuit 220 to write.
LED-backlit driving circuit 220 is the sequential control instruction of the time schedule controller 12 of control circuit for reading timing sequence 210 directly, and determines work schedule and the inflow current size of LED lamp bar 10 according to the sequential control instruction.
Simultaneously, LED-backlit driving circuit 220 detects current just at the actual inflow current information of luminous LED lamp bar 10.
Above-mentioned LED-backlit driving circuit 220 can be integrated circuit.
LED-backlit driving circuit 220 detect obtain current just at the actual inflow current information of alight bar.LED-backlit driving circuit 220 judges that the actual standard current value of storing in current value and LED-backlit driving circuit 220 registers that flows into compares, if the actual current value that flows into is greater than described standard current value, this comparative result is sent to feedback control circuit, feedback control circuit sends the steering order of reduction output voltage to DC-DC booster circuit 240 according to this comparative result, DC-DC booster circuit 240 reduces output voltage, described LED lamp bar 10 receives the output voltage of DC-DC booster circuit 240, makes LED lamp bar 10 reach corresponding bright.
LED-backlit driving circuit 220 judges that the standard current value of storing in described actual inflow current and LED-backlit driving circuit 220 registers compares, if the actual current value that flows into is less than described standard current value, this comparative result is sent to feedback control circuit, feedback control circuit sends the steering order of increase output voltage to DC-DC booster circuit 240 according to this comparative result, DC-DC booster circuit 240 increases output voltage, described LED lamp bar 10 receives the output voltage of DC-DC booster circuit 240, makes LED lamp bar 10 reach corresponding bright.
The current information that sequential control circuit 210 is sent in the control information of LED-backlit driving circuit 220 is stored in LED-backlit driving circuit 220 registers, as standard current value.
DC-DC booster circuit 240 can boost or step-down according to the real-time adjustment of feedback control circuit 230.
Preferably, in the above-mentioned scan drive system backlight, specifically can connect by serial peripheral equipment interface SPI between sequential control circuit 210 and the LED-backlit driving circuit 220, can realize synchronous serial-data transmission between sequential control circuit 210 and the LED-backlit driving circuit 220, increase the communication efficiency between sequential control circuit 210 and the LED-backlit driving circuit 220.
The utility model also provides a kind of backlight simultaneously, comprises having previously described scan drive system backlight, and the LED lamp bar that passes through described scan drive system control backlight.
Described backlight can be to comprise direct-light-type backlight or side-light type back light.
The described scan drive system backlight of the utility model embodiment can be used as the drive system of direct-light-type backlight, also can be used as the drive system of side-light type back light.
In sum, in the utility model scan drive system backlight, utilize sequential control circuit 210 to trigger the duty of LED-backlit driving circuit 220 control LED lamp bars 10, the realization subregion is lighted backlight, therefore, compared with prior art, in the utility model scan drive system backlight, saved single chip circuit, reduce accordingly the probability that scan drive system backlight breaks down, thereby improved the stability of scan drive system backlight.
In addition, in the utility model scan drive system backlight, do not need to arrange single chip circuit, when significantly improving the stability of scan drive system backlight, reduced the cost of scan drive system backlight.
Obviously, those skilled in the art can carry out various changes and modification to the utility model and not break away from spirit and scope of the present utility model.Like this, if of the present utility model these are revised and modification belongs within the scope of the utility model claim and equivalent technologies thereof, then the utility model also is intended to comprise these changes and modification interior.
Claims (7)
1. a sequential control circuit is characterized in that, comprising:
Store the storer of the LED lamp bar activation bit that the communications protocol of register in the corresponding LED-backlit driving circuit writes;
And link to each other with described storer, produce the timing sequencer of sequential control instruction according to the activation bit in the described storer.
2. scan drive system backlight, it is characterized in that, comprise: sequential control circuit claimed in claim 1, and be connected the LED-backlit driving circuit of LED lamp bar duty in the control backlight with the timing sequencer of described sequential control circuit.
3. scan drive system backlight according to claim 2 is characterized in that, further comprises:
The DC-DC booster circuit that is connected with the LED lamp bar;
Be connected to the feedback control circuit between described LED-backlit driving circuit and the described DC-DC booster circuit.
4. scan drive system backlight as claimed in claim 2 or claim 3 is characterized in that, is connected by serial peripheral equipment interface SPI between described sequential control circuit and the described LED-backlit driving circuit.
5. scan drive system backlight as claimed in claim 2 or claim 3 is characterized in that described LED lamp bar is a plurality of.
6. a backlight is characterized in that, comprise such as the described scan drive system backlight of claim 2 to 5, and the LED lamp bar that passes through described scan drive system control backlight.
7. backlight as claimed in claim 6 is characterized in that, described backlight is direct-light-type backlight or side-light type back light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220504492 CN202855274U (en) | 2012-09-27 | 2012-09-27 | Time-sequence control circuit, backlight scanning driving system and backlight source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220504492 CN202855274U (en) | 2012-09-27 | 2012-09-27 | Time-sequence control circuit, backlight scanning driving system and backlight source |
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| Publication Number | Publication Date |
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| CN202855274U true CN202855274U (en) | 2013-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220504492 Expired - Lifetime CN202855274U (en) | 2012-09-27 | 2012-09-27 | Time-sequence control circuit, backlight scanning driving system and backlight source |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103745693A (en) * | 2013-12-27 | 2014-04-23 | 深圳市华星光电技术有限公司 | Driving circuit of LED backlight and driving method thereof |
| TWI553620B (en) * | 2013-09-10 | 2016-10-11 | 群創光電股份有限公司 | Partial scanning gate driver and liquid crystal display using the same |
| CN107045851A (en) * | 2016-02-05 | 2017-08-15 | 大陆汽车电子(芜湖)有限公司 | Head-up display method for controlling backlight thereof based on SPI |
| CN113014092A (en) * | 2021-04-30 | 2021-06-22 | 北京京东方显示技术有限公司 | Voltage-stabilized power supply, voltage-stabilized power supply method and display device |
-
2012
- 2012-09-27 CN CN 201220504492 patent/CN202855274U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI553620B (en) * | 2013-09-10 | 2016-10-11 | 群創光電股份有限公司 | Partial scanning gate driver and liquid crystal display using the same |
| CN103745693A (en) * | 2013-12-27 | 2014-04-23 | 深圳市华星光电技术有限公司 | Driving circuit of LED backlight and driving method thereof |
| WO2015096200A1 (en) * | 2013-12-27 | 2015-07-02 | 深圳市华星光电技术有限公司 | Led backlight drive circuit and drive method therefor |
| CN103745693B (en) * | 2013-12-27 | 2016-01-27 | 深圳市华星光电技术有限公司 | A kind of LED backlight drive circuit and driving method thereof |
| US9253841B2 (en) | 2013-12-27 | 2016-02-02 | Shenzhen China Star Optoelectronics Technology Co., Ltd | LED backlight driving circuit and method for driving the LED backlight driving circuit |
| CN107045851A (en) * | 2016-02-05 | 2017-08-15 | 大陆汽车电子(芜湖)有限公司 | Head-up display method for controlling backlight thereof based on SPI |
| CN107045851B (en) * | 2016-02-05 | 2019-08-02 | 大陆汽车车身电子系统（芜湖）有限公司 | Head-up display method for controlling backlight thereof based on SPI |
| US10852536B2 (en) | 2016-02-05 | 2020-12-01 | Continental Automotive Gmbh | SPI-based head-up display backlight control method |
| CN113014092A (en) * | 2021-04-30 | 2021-06-22 | 北京京东方显示技术有限公司 | Voltage-stabilized power supply, voltage-stabilized power supply method and display device |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130403 |