CN106409241A - Liquid crystal display apparatus and short circuit protection method of multi-partition LED backlight - Google Patents
Liquid crystal display apparatus and short circuit protection method of multi-partition LED backlight Download PDFInfo
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- CN106409241A CN106409241A CN201611076228.4A CN201611076228A CN106409241A CN 106409241 A CN106409241 A CN 106409241A CN 201611076228 A CN201611076228 A CN 201611076228A CN 106409241 A CN106409241 A CN 106409241A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
Abstract
A liquid crystal display apparatus and a short circuit protection method of multi-partition LED backlight are disclosed. The method is characterized by making each driving unit try to increase a driving current according to a certain time interval and a certain voltage step length, and simultaneously reducing a PWM duty ratio so that a product of the driving current and the PWM duty ratio can reach, maintain and stabilize at a set value so as to end starting of backlight lightening and enter into a normal backlight work process; during a backlight lightening process, if a difference value of driving voltages of any two LED light bars exceeds a set protection voltage threshold value, determining that the LED light bar with a lower driving voltage value generates a short circuit, disconnecting the LED light bar through turning off a first MOS pipe; and during a normal backlight work process, if the driving current reaches a set current protection point, determining that the LED light bar generates the short circuit, and then disconnecting the LED light bar through turning off the first MOS pipe. In the invention, safety of the liquid crystal display apparatus can be effectively increased.
Description
Technical field
The present invention relates to the multi partition backlight driving system of liquid crystal indicator, more particularly, to liquid crystal indicator.
Background technology
At present, in TV domain, the backlight of liquid crystal panel has been almost LED-backlit entirely.In order to improve display effect, high
End TV, for example：ULED TV, usually adopts multi partition LED-backlit, each subregion LED-backlit can be according to display picture
Gray scale adjustment carrys out backlight illumination.Because multi partition LED-backlit needs using many LED lamp bar, lamp bar line number amount and LED driving number
Amount is consequently increased；Consequently, it is possible to easily in process of production, by crowded line, connect the problems such as weldering and component failure, lead to LED
The probability of happening of short circuit, compared to common LED-backlit TV, can greatly increase.Therefore, be necessary in fact many to ULED TV
Subregion LED-backlit technology improves, be the more perfect fail-safe design of multi partition LED-backlit drive system such that it is able to
While lifting effect, the generation of safety problem can be effectively prevented from.
Content of the invention
The technical problem to be solved in the present invention is to overcome the shortcomings of that above-mentioned prior art exists, and proposes a kind of multi partition
The short-circuit protection method of LED-backlit, can effectively improve the safety of liquid crystal indicator.
The technical scheme that the present invention is directed to above-mentioned technical problem and proposes includes, and proposes a kind of the short of multi partition LED-backlit
Road guard method, including：
Multi partition backlight driving system is made to include：LED drive power；LED multi-path lamp bar, the anode of each paths of LEDs lamp bar simultaneously connects this
The driving voltage that LED drive power provides；Microprocessor, including multiple driver elements, each driver element is used for controlling correspondence
A paths of LEDs lamp bar driving current；First metal-oxide-semiconductor, is connected with corresponding LED lamp bar, be controlled by corresponding driver element and
Closure/disconnect；Current sampling resistor, for the driving current of corresponding LED lamp bar of sampling, is supplied to this driver element；
So that each driver element can be attempted improving driving current, reduce simultaneously according to intervals, certain voltage step-length
PWM duty cycle is so that driving current can reach and maintain stably in setting value with the product of PWM duty cycle, to terminate to light
The startup of backlight entry of backlight course of normal operation；
Lighting backlight process, if the difference of the driving voltage of any two paths of LED lamp bar exceedes the protection voltage threshold of setting
Value, then judge that short circuit in the relatively low LED lamp bar of driving voltage value, and then can disconnect this paths of LEDs by turning off the first metal-oxide-semiconductor
Lamp bar；
In backlight course of normal operation, if the driving current of certain paths of LEDs lamp bar reaches the current protection point of setting, judging should
Short circuit in paths of LEDs lamp bar, and then can disconnect this paths of LEDs lamp bar by turning off the first metal-oxide-semiconductor.
The technical scheme that the present invention is directed to above-mentioned technical problem and proposes also includes, and proposes a kind of liquid crystal indicator, bag
Include liquid crystal panel and multi partition backlight driving system, this multi partition backlight driving system includes：LED drive power；Multi-way LED lamp
Bar, the anode of each paths of LEDs lamp bar simultaneously connects the driving voltage that this LED drive power provides；Microprocessor, drives list including multiple
Unit, each driver element is used for controlling the driving current of a corresponding paths of LEDs lamp bar；First metal-oxide-semiconductor, with corresponding LED lamp bar
It is connected, be controlled by corresponding driver element and close/disconnect；Current sampling resistor, for the driving of corresponding LED lamp bar of sampling
Electric current, is supplied to this driver element；
Wherein, each driver element can be attempted improving driving current, simultaneously according to intervals, certain voltage step-length
Reduce PWM duty cycle so that driving current can reach and maintain stably in setting value with the product of PWM duty cycle, to terminate
Light startup the entry of backlight course of normal operation of backlight；
Lighting backlight process, if the difference of the driving voltage of any two paths of LED lamp bar exceedes the protection voltage threshold of setting
Value, then judge that short circuit in the relatively low LED lamp bar of driving voltage value, and then can disconnect this paths of LEDs by turning off the first metal-oxide-semiconductor
Lamp bar；
In backlight course of normal operation, if the driving current of certain paths of LEDs lamp bar reaches the current protection point of setting, judging should
Short circuit in paths of LEDs lamp bar, and then can disconnect this paths of LEDs lamp bar by turning off the first metal-oxide-semiconductor.
Compared with prior art, by the present invention in that each driver element can walk according to intervals, certain voltage
Long, to attempt improving driving current, to reduce PWM duty cycle so that driving current can reach with the product of PWM duty cycle simultaneously
And maintain stably in setting value, the protection voltage threshold value of setting is exceeded in the difference of the driving voltage of any two paths of LED lamp bar
When it is possible to determine that light backlight process occur short circuit, when driving current reaches the current protection point of setting it is possible to determine that
Short circuit in backlight course of normal operation, and then can disconnect short circuit when judging that short circuit occurs by turning off the first metal-oxide-semiconductor
LED lamp bar, the safety of liquid crystal indicator can be effectively improved.
Brief description
Fig. 1 be the present invention liquid crystal indicator in multi partition backlight driving system theory diagram.
Fig. 2 is the flow chart of the short-circuit protection method of multi partition LED-backlit of the present invention.
Fig. 3 is the flow chart of present invention short-circuit protection method of LED lamp bar during lighting backlight.
Fig. 4 is the flow chart of present invention short-circuit protection method of LED lamp bar in backlight course of normal operation.
Fig. 5 be the present invention liquid crystal indicator in multi partition backlight driving system electrical schematic diagram.
Fig. 6 be the present invention liquid crystal indicator in the electrical schematic diagram that drives of single led lamp bar.
Fig. 7 is the triggering oscillogram of present invention short-circuit protection of LED lamp bar in backlight course of normal operation.
Wherein, description of reference numerals is as follows：100 multi partition backlight driving system, 101 microprocessor 102 LD interface
103 LED multi-path driving chip 104 single LED drives output unit 105 LED lamp bar 106 voltage and current detection circuit；
503 LED multi-path driving chip 504 first metal-oxide-semiconductor, 505 LED lamp bar, 506 current sampling resistor 508 LED drives electricity
Source；5031 second metal-oxide-semiconductor 5032 operational amplifier；The short-circuit trigger process 703 of 701 normal operating condition 702 sets
Current protection value.
Specific embodiment
Below in conjunction with accompanying drawing, the present invention is given with further elaboration.
Referring to Fig. 1, Fig. 1 be the present invention liquid crystal indicator in multi partition backlight driving system theory diagram.This
A kind of liquid crystal indicator of bright proposition, this liquid crystal indicator can be liquid crystal display screen or LCD TV.This liquid crystal display
The multi partition backlight driving system 100 that device includes liquid crystal panel and provides backlight for this liquid crystal panel.This multi partition backlight
Drive system 100 includes：Microprocessor 101, LD（The backlight adjustment of LOCAL DIMMING dynamic area）Interface 102, LED multi-path
Driving chip 103, single LED drives output unit 104, LED lamp bar 105 and voltage and current detection circuit 106.
Referring to Fig. 2, Fig. 2 is the flow chart of the short-circuit protection method of multi partition LED-backlit of the present invention.Multi partition LED carries on the back
The short-circuit protection method of light comprises the following steps：
S201, make each driver element can according to intervals, certain voltage step-length, attempt improve driving current, with
When reduce PWM (Pulse-width modulation, pulse width modulation) dutycycle so that driving current and PWM duty
The product of ratio can reach and maintain to be stablized in setting value, to terminate to light startup the entry of backlight normal work mistake of backlight
Journey；
S202, lighting backlight process, if the difference of the driving voltage of any two paths of LED lamp bar exceedes the protection voltage of setting
Threshold value, then judge that short circuit in the relatively low LED lamp bar of driving voltage value, and then can disconnect this by turning off the first metal-oxide-semiconductor
Paths of LEDs lamp bar；And
S203, in backlight course of normal operation, if the driving current of certain paths of LEDs lamp bar reaches the current protection point of setting,
Judge that short circuit in this paths of LEDs lamp bar, and then this paths of LEDs lamp bar can be disconnected by turning off the first metal-oxide-semiconductor.
It is noted that above-mentioned lighting backlight process and setting in two kinds of short-circuit protections of backlight course of normal operation
Meter, both in LED lamp bar during most lamp short circuit, or even during the positive and negative short circuit of LED lamp bar, can protect, prevented the big electricity of high pressure in time
Stream impact burn out device, cause on fire；Can also in LED lamp bar minority lamp, or even during the short circuit of lamp, disconnect lamp bar, prevent
Only lamp bar generate heat for a long time, cause on fire.
Referring to Fig. 3, Fig. 3 is the flow chart of present invention short-circuit protection method of LED lamp bar during lighting backlight.Point
During bright backlight, the short-circuit protection method of LED lamp bar comprises the following steps：
S301, LED drive circuit start, and with minimum duty cycle, allow each paths of LEDs lamp bar to turn on；
S302, judge whether that the conducting electric current of certain paths of LEDs lamp bar exceedes the protective current value of setting, if being, go to step
S308, otherwise, goes to step S303；
S303, it is stepped up driving voltage, each paths of LEDs lamp bar can reach setting electric current value successively according to pressure drop height；
S304, record each paths of LEDs lamp and reach corresponding driving voltage value during setting electric current value；
S305, judge whether that the difference with corresponding driving voltage value during setting electric current value of any two paths of LED lamp bar exceedes setting
Short-circuit protection voltage threshold value, if being, go to step S307, otherwise, go to step S306；
S306, startup terminate, and enter normal operating conditions；
There is short circuit in S307, the judgement LED lamp bar relatively low with corresponding driving voltage value during setting electric current value, go to step S309；
There is short circuit in the LED lamp bar of the protective current value that S308, judgement conducting electric current exceed setting, go to step S309；
S309, the LED lamp bar of disconnection short circuit.
Referring to Fig. 4, Fig. 4 is the flow chart of present invention short-circuit protection method of LED lamp bar in backlight course of normal operation.
In backlight course of normal operation, the short-circuit protection method of LED lamp bar comprises the following steps：
If short circuit in certain paths of LEDs lamp bar of S401, its pressure drop can reduce；
S402, the LED drive unit of this street lamp bar improve driving voltage to lift the conducting electric current of lamp bar, reduce conducting simultaneously and account for
Empty ratio；
S403, judge whether that the conducting electric current of this paths of LEDs lamp bar exceedes the protective current value of setting, if being, go to step S404,
Otherwise, go to step S402；
S404, judge this paths of LEDs lamp bar exist short circuit；
S405, the LED lamp bar of disconnection short circuit.
Referring to Fig. 5, Fig. 5 be the present invention liquid crystal indicator in multi partition backlight driving system electrical schematic diagram.This is many
Subregion backlight driving system 500 includes：LED multi-path driving chip 503, the first metal-oxide-semiconductor 504, LED lamp bar 505, current sample electricity
Resistance 506 and LED drive power 508.
It is understood that this LED multi-path driving chip 503 is microprocessor.This LED multi-path driving chip 503 includes
Multichannel driver element, can be driven to LED multi-path lamp bar 505 controlling.In the present embodiment, this LED multi-path driving chip
503 being capable of drive control 16 paths of LEDs lamp bar 505.In other embodiments, this multi partition backlight driving system 500 can be applied
Any LED lamp bar 505 quantity LED-backlit application, for LED lamp bar 505 quantity more than the application scenarios on 16 tunnels, both may be used
With the LED multi-path driving chip 503 higher from disposal ability, it is possible to use multiple LED multi-path driving chip 503.
This LED drive power 508 can be randomly topologically structured DC-DC conversion circuit or AC-DC translation circuit, uses
According to input voltage VIN, the driving voltage VLED providing.Driving voltage VLED can be fed back to by this LED drive power 508
Port FB1 to this LED multi-path driving chip 503.Specifically, driving voltage VLED is via resistance Rfb1 and resistance Efb2
Partial pressure, then through resistance Rfb3 send into port FB1.
In conjunction with referring to Fig. 6, Fig. 6 be the present invention liquid crystal indicator in the electrical schematic diagram that drives of single led lamp bar.Single
LED lamp bar drives and includes：Driver element 5030, the first metal-oxide-semiconductor 504, LED lamp bar 505 and current sampling resistor 506.
This driver element 5030 is equivalent to the corresponding G port of LED multi-path driving chip 503 in Fig. 5 and a S port
Between equivalent circuit.In the present embodiment, this driver element 5030 includes second metal-oxide-semiconductor 5031 and an operation amplifier
Device 5032.First metal-oxide-semiconductor 504 and the second metal-oxide-semiconductor 5031 are two metal-oxide-semiconductors being serially connected, and the first metal-oxide-semiconductor 504 works in out
Off status, controls break-make according to PWM, and the second metal-oxide-semiconductor 5031 works in linear condition, is controlled by operational amplifier 5032 and is operated in
Linear zone.
During using metal-oxide-semiconductor linear condition, drain current（I.e. LED current）The feature that Id voltage driven Vgs controls is permissible
Control the electric current of LED lamp bar 505 by the second metal-oxide-semiconductor 5031.Wherein, the anode of LED multi-path lamp bar 505 is to be connected in parallel on one
Rise, the driving voltage VLED being provided with LED drive power is connected, the negative electrode of each paths of LEDs lamp bar 505 and corresponding first metal-oxide-semiconductor
504 drain electrode is connected.In the ideal situation, each paths of LEDs lamp bar 505 does not have pressure reduction, and each paths of LEDs lamp bar 505 is in equally electricity
In the case of stream, required driving voltage is the same.
The principle of the LED short-circuit protection that this multi partition backlight driving system 500 is realized during lighting backlight is substantially：
During lighting backlight, first control the first metal-oxide-semiconductor 504 with minimum duty cycle, allow each paths of LEDs lamp bar 505 to turn on, pass through
Current sampling resistor 506 detects each paths of LEDs lamp bar 505 electric current, if electric current exceedes design protection point current value, judges LED
Short circuit in lamp bar 505, and driver element 5030 stops starting, and prevents from causing device failure, heating, on fire because of short circuit.If LED
Lamp bar 505 electric current is normal, not trigger protection, and driver element 5030 continues to start, the driving of lifting step by step LED drive power 508
Voltage VLED, presses step uphill process in driving voltage VLED from initial voltage, and each paths of LEDs lamp bar 505 can be according to pressure drop height
Reach setting electric current value successively, when recording every paths of LEDs lamp bar 505 arrival setting electric current value simultaneously, corresponding driving voltage VLED
Value, if the difference of any corresponding driving voltage VLED of two paths of LED lamp bar 505, exceed setting short-circuit protection voltage threshold
It is worth, then LED short circuit in the relatively low LED lamp bar 505 of the value of judgement driving voltage VLED, disconnects short circuit by the first metal-oxide-semiconductor 504
LED lamp bar 505.Wherein, this short-circuit protection voltage threshold value can be by scanning the drive of the LED lamp bar 505 of normal backlight
Galvanic electricity pressure difference to be determined it is also possible to be set as the magnitude of voltage of fixation by this LED multi-path driving chip 503 intelligence.
The principle of the LED short-circuit protection that this multi partition backlight driving system 500 is realized in backlight course of normal operation is big
Cause be：
Driving voltage Vgs, after starting initialization, is held essentially constant.When LED-backlit drives normal work, driver element
5030 according to intervals, certain voltage step-length, to attempt improving driving voltage Vgs to improve LED current Id, to subtract simultaneously
Few PWM duty cycle, so that electric current Id* dutycycle D of every paths of LEDs lamp bar 505 remains setting electric current value, reaches and maintains steady
Fixed, referring to the normal operating condition 701 in Fig. 7.
Certain paths of LEDs lamp bar 505 short circuit causing if there is component damage, this paths of LEDs lamp bar 505 pressure drop can reduce,
Driver element 5030 can be attempted improving the LED lamp bar that there is short circuit according to aforesaid intervals, certain voltage step-length
505 electric current, reduces its conducting dutycycle simultaneously, to prevent corresponding first metal-oxide-semiconductor 504 due to the pressure drop of Drain-Source
High and damage of generating heat.In conjunction with referring to the short-circuit trigger process 702 in Fig. 7, when this paths of LEDs lamp bar 505 electric current reaches the electricity of setting
During stream protection point 703, then it is judged to that short circuit occurs, disconnects the LED lamp bar 505 of short circuit by turning off this first metal-oxide-semiconductor 504, prevent
Only LED lamp bar 505 is generated heat/causes on fire for a long time, avoids damaging other the normal LED in the LED lamp bar 505 of fault simultaneously.
Compared with prior art, by the present invention in that each driver element 5030 can be according to intervals, necessarily electricity
Pressure step-length, to attempt improving driving current, reduces PWM duty cycle so that the product of driving current and PWM duty cycle can simultaneously
Reach and maintain and stablize in setting value, exceed the protection voltage of setting in the difference of the driving voltage of any two paths of LED lamp bar 505
It is possible to determine that short circuit occurs lighting backlight process during threshold value, when driving current reaches the current protection point of setting, permissible
Judge, in backlight course of normal operation, short circuit occurs, and then can be when judging that short circuit occurs, by turning off the first metal-oxide-semiconductor 504
To disconnect the LED lamp bar 505 of short circuit, the safety of liquid crystal indicator can be effectively improved.
The above, only presently preferred embodiments of the present invention, are not intended to limit embodiment of the present invention, and this area is general
Logical technical staff, according to the central scope of the present invention and spirit, can very easily carry out flexible accordingly or modification, therefore this
The protection domain of invention should the protection domain required by by claims be defined.
Claims (10)
1. a kind of short-circuit protection method of multi partition LED-backlit it is characterised in that
Multi partition backlight driving system is made to include：LED drive power；LED multi-path lamp bar, the anode of each paths of LEDs lamp bar simultaneously connects this
The driving voltage that LED drive power provides；Microprocessor, including multiple driver elements, each driver element is used for controlling correspondence
A paths of LEDs lamp bar driving current；First metal-oxide-semiconductor, is connected with corresponding LED lamp bar, be controlled by corresponding driver element and
Closure/disconnect；Current sampling resistor, for the driving current of corresponding LED lamp bar of sampling, is supplied to this driver element；
So that each driver element can be attempted improving driving current, reduce simultaneously according to intervals, certain voltage step-length
PWM duty cycle is so that driving current can reach and maintain stably in setting value with the product of PWM duty cycle, to terminate to light
The startup of backlight entry of backlight course of normal operation；
Lighting backlight process, if the difference of the driving voltage of any two paths of LED lamp bar exceedes the protection voltage threshold of setting
Value, then judge that short circuit in the relatively low LED lamp bar of driving voltage value, and then can disconnect this paths of LEDs by turning off the first metal-oxide-semiconductor
Lamp bar；
In backlight course of normal operation, if the driving current of certain paths of LEDs lamp bar reaches the current protection point of setting, judging should
Short circuit in paths of LEDs lamp bar, and then can disconnect this paths of LEDs lamp bar by turning off the first metal-oxide-semiconductor.
2. the short-circuit protection method of the multi partition LED-backlit described in foundation claim 1 is it is characterised in that make each drive list
Unit includes the second metal-oxide-semiconductor, and the drain electrode of this second metal-oxide-semiconductor is connected with the source electrode of this first metal-oxide-semiconductor, the source electrode of this second metal-oxide-semiconductor and
This current sampling resistor is connected.
3. the short-circuit protection method of the multi partition LED-backlit described in foundation claim 2 is it is characterised in that make this first metal-oxide-semiconductor
Work on off state；This second metal-oxide-semiconductor works in linear condition.
4. the short-circuit protection method of the multi partition LED-backlit described in foundation claim 3 is it is characterised in that make each drive list
Unit also includes operational amplifier, and the output of this operational amplifier terminates the grid of this driver element pipe, and the one of this operational amplifier
Individual input is connected with the grid of this first metal-oxide-semiconductor, another input of this operational amplifier and this current sampling resistor phase
Even.
5. the short-circuit protection method of the multi partition LED-backlit described in foundation any one of Claims 1-4 is it is characterised in that make this
LED drive power is Switching Power Supply, during lighting backlight, this LED drive power provide driving voltage be controlled gradually
Raise.
6. a kind of liquid crystal indicator, including liquid crystal panel and multi partition backlight driving system it is characterised in that this multi partition is carried on the back
Optical drive system includes：LED drive power；LED multi-path lamp bar, the anode of each paths of LEDs lamp bar simultaneously connects the offer of this LED drive power
Driving voltage；Microprocessor, including multiple driver elements, each driver element is used for controlling a corresponding paths of LEDs lamp bar
Driving current；First metal-oxide-semiconductor, is connected with corresponding LED lamp bar, is controlled by corresponding driver element and closes/disconnect；Electric current is adopted
Sample resistance, for the driving current of corresponding LED lamp bar of sampling, is supplied to this driver element；
Wherein, each driver element can be attempted improving driving current, simultaneously according to intervals, certain voltage step-length
Reduce PWM duty cycle so that driving current can reach and maintain stably in setting value with the product of PWM duty cycle, to terminate
Light startup the entry of backlight course of normal operation of backlight；
Lighting backlight process, if the difference of the driving voltage of any two paths of LED lamp bar exceedes the protection voltage threshold of setting
Value, then judge that short circuit in the relatively low LED lamp bar of driving voltage value, and then can disconnect this paths of LEDs by turning off the first metal-oxide-semiconductor
Lamp bar；
In backlight course of normal operation, if the driving current of certain paths of LEDs lamp bar reaches the current protection point of setting, judging should
Short circuit in paths of LEDs lamp bar, and then can disconnect this paths of LEDs lamp bar by turning off the first metal-oxide-semiconductor.
7. according to the liquid crystal indicator described in claim 6 it is characterised in that each driver element includes the second metal-oxide-semiconductor, should
The drain electrode of the second metal-oxide-semiconductor is connected with the source electrode of this first metal-oxide-semiconductor, and the source electrode of this second metal-oxide-semiconductor is connected with this current sampling resistor.
8. according to the liquid crystal indicator described in claim 7 it is characterised in that this first metal-oxide-semiconductor works on off state；Should
Second metal-oxide-semiconductor works in linear condition.
9. according to the liquid crystal indicator described in claim 8 it is characterised in that each driver element also includes operation amplifier
Device, the output of this operational amplifier terminates the grid of this driver element pipe, an input of this operational amplifier with this first
The grid of metal-oxide-semiconductor is connected, and another input of this operational amplifier is connected with this current sampling resistor.
10. according to the liquid crystal indicator described in any one of claim 6 to 9 it is characterised in that this LED drive power is out
Close power supply, during lighting backlight, the driving voltage that this LED drive power provides is controlled gradually to raise.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811288773.9A CN109243379B (en) | 2016-11-29 | 2016-11-29 | Liquid crystal display device and short-circuit protection method of multi-partition LED backlight |
| CN201611076228.4A CN106409241B (en) | 2016-11-29 | 2016-11-29 | The short-circuit protection method of liquid crystal display device and multi partition LED backlight |
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| CN201611076228.4A CN106409241B (en) | 2016-11-29 | 2016-11-29 | The short-circuit protection method of liquid crystal display device and multi partition LED backlight |
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| CN201611076228.4A Active CN106409241B (en) | 2016-11-29 | 2016-11-29 | The short-circuit protection method of liquid crystal display device and multi partition LED backlight |
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| CN109584829A (en) * | 2018-12-25 | 2019-04-05 | 惠科股份有限公司 | Over-current protection method, display panel and overcurrent protective device |
| CN109713637A (en) * | 2018-12-27 | 2019-05-03 | 惠科股份有限公司 | A kind of over-current protection method, current foldback circuit and display device |
| CN110767183A (en) * | 2019-04-18 | 2020-02-07 | 友达光电股份有限公司 | Display device and backlight driving method thereof |
| CN112908232A (en) * | 2021-03-26 | 2021-06-04 | 四川长虹电器股份有限公司 | LED multi-partition backlight fault detection system and fault judgment method |
| CN113314065A (en) * | 2021-06-04 | 2021-08-27 | 豪威触控与显示科技(深圳)有限公司 | Driving method, pixel circuit and display panel |
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| CN109584829A (en) * | 2018-12-25 | 2019-04-05 | 惠科股份有限公司 | Over-current protection method, display panel and overcurrent protective device |
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| US11646565B2 (en) | 2018-12-27 | 2023-05-09 | HKC Corporation Limited | Overcurrent protection method, overcurrent protection circuit, and display device |
| CN110767183A (en) * | 2019-04-18 | 2020-02-07 | 友达光电股份有限公司 | Display device and backlight driving method thereof |
| CN110767183B (en) * | 2019-04-18 | 2020-12-29 | 友达光电股份有限公司 | Display device and backlight driving method thereof |
| CN112908232A (en) * | 2021-03-26 | 2021-06-04 | 四川长虹电器股份有限公司 | LED multi-partition backlight fault detection system and fault judgment method |
| CN112908232B (en) * | 2021-03-26 | 2022-10-18 | 四川长虹电器股份有限公司 | LED multi-partition backlight fault detection system and fault judgment method |
| CN113314065A (en) * | 2021-06-04 | 2021-08-27 | 豪威触控与显示科技(深圳)有限公司 | Driving method, pixel circuit and display panel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109243379A (en) | 2019-01-18 |
| CN106409241B (en) | 2019-01-04 |
| CN109243379B (en) | 2020-10-23 |
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