CN108574260A - A kind of backlight module power protecting circuit and mobile unit - Google Patents
A kind of backlight module power protecting circuit and mobile unit Download PDFInfo
- Publication number
- CN108574260A CN108574260A CN201710142080.8A CN201710142080A CN108574260A CN 108574260 A CN108574260 A CN 108574260A CN 201710142080 A CN201710142080 A CN 201710142080A CN 108574260 A CN108574260 A CN 108574260A
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- Prior art keywords
- circuit
- delay sub
- driving chip
- triode
- backlight
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
-
- 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
- G09G3/36—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 using liquid crystals
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/063—Details concerning the co-operation of many similar arrangements, e.g. in a network
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal Display Device Control (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
A kind of backlight module power protecting circuit of the embodiment of the present invention offer and mobile unit, are related to auto parts machinery, and in the case of capable of realizing no MCU controls, backlight driving chip restarts after abnormity of power supply closing, is conducive to device miniaturization.The backlight module power protecting circuit, including：The output end at the operating voltage end of the input terminal connection backlight driving chip of charging delay sub-circuit, charging delay sub-circuit is connected to the base stage of triode；The emitter of triode connects the FAIL pins of the backlight drive core, and the collector of the triode is connect with the enabled EN pins of the backlight driving chip；The output end at the input terminal connection enable signal end of booting delay sub-circuit, booting delay sub-circuit connects the enabled EN pins of the backlight driving chip.The embodiment of the present invention is powered for mobile unit to external equipment.
Description
Technical field
The embodiment of the present invention is related to auto parts machinery more particularly to a kind of backlight module power protecting circuit and vehicle-mounted sets
It is standby.
Background technology
As shown in Figure 1, existing backlight module includes LCD (Liquid Crystal Display, liquid crystal display) mould
Block 10, backlight driving chip 11 and MCU ((Microcontroller Unit, micro-control units) 12.Wherein, backlight module electricity
The design scheme of source protection mechanism is as follows：When backlight driving chip 11 occurs because of unusual conditions such as overvoltage, overcurrent, Thermal protections,
By automatic protection.And send out Fail signals (abnormality id signal) notice MCU12.After MCU12 receives the Fail signals,
It can attempt to be again turned on power supply action.It is specific as follows：When the power work of backlight module is normal, backlight driving chip 11
FAIL pins (guard mode clock signal output pin) export high level；When the power work exception of backlight module, backlight
The FAIL pins of driving chip 11 export low level.MCU 12 detects the low electricity of the FAIL pins output of backlight driving chip 11
After ordinary mail number, low level signal is exported to the EN pins (enable pin) of backlight driving chip 11, backlight driving chip 11 is made to close
It closes.After a period of time, MCU 12 exports high level signal to the EN pins of backlight driving chip 11, makes backlight driving chip
11 restart.
Existing backlight module power protection scheme is required to MCU and participates in control, after abnormity of power supply, realizes backlight drive
The closing of chip and restart.But MCU occupies more substrate space, does not utilize the miniaturization of equipment.
Invention content
The embodiment of the present invention provides a kind of backlight module power protecting circuit, in the case of capable of realizing no MCU controls,
Backlight driving chip restarts after abnormity of power supply closing, is conducive to device miniaturization.
In a first aspect, a kind of backlight module power protecting circuit is provided, including：Triode, charging delay sub-circuit, booting
Be delayed sub-circuit；
The operating voltage end of the input terminal connection backlight driving chip of charging delay sub-circuit, charge the defeated of delay sub-circuit
Outlet is connected to the base stage of triode, and charging delay sub-circuit is from the operating voltage end input service voltage of backlight driving chip
Cut-in voltage is exported to open the triode to the base stage of triode after predetermined first duration；
The emitter of triode connects the FAIL pins of the backlight drive core, the collector of the triode and the back of the body
The EN pins of optical drive chip connect；
The input terminal connection enable signal end of booting delay sub-circuit, the output end of booting delay sub-circuit connect the back of the body
The EN pins of optical drive chip；Booting delay sub-circuit is from enable signal end inputs enabled voltage to institute after predetermined second duration
The EN pins for stating backlight driving chip export the enabled voltage, open the backlight driving chip；In triode open state
Under, the shutdown signal of FAIL pins output is transmitted to the EN pins closing backlight driving chip of the backlight driving chip.
Optionally, charging delay sub-circuit includes：Resistance R1, capacitance C1 and capacitance C2；
The first end of the resistance R1 connects the input terminal of the charging delay sub-circuit, and the second end of the R1 connects institute
State the output end of charging delay sub-circuit；
One end of the C1 connects the charging delay sub-circuit output end, other end ground connection；
One end of the C2 connects the charging delay sub-circuit output end, other end ground connection.
Optionally, series resistance R2, institute between the base stage of the triode and the output end of the charging delay sub-circuit
The base stage for stating triode is also grounded by resistance R3.
Optionally, booting delay sub-circuit includes：Resistance R4, capacitance C3；
The input terminal of the booting delay sub-circuit of the first end connection of the resistance R4, the second end connection of the resistance R4
Booting delay sub-circuit output end；
The output end of the booting delay sub-circuit of the one end capacitance C3 connection, other end ground connection；
Wherein, enable signal end is closed to the charging time of capacitance C3 more than the backlight driving chip by resistance R4
Discharge time afterwards.
Second aspect provides a kind of mobile unit, including LCD module, backlight driving chip and above-mentioned any backlight
Module power protecting circuit.
In the backlight module power protecting circuit that said program provides, including following connection structure：Charging delay sub-circuit
Input terminal connection backlight driving chip operating voltage end, the output end of charging delay sub-circuit is connected to the base of triode
Pole；The emitter of triode connects the FAIL pins of the backlight drive core, and the collector of the triode drives with the backlight
The EN pins connection of dynamic chip；The input terminal connection enable signal end of booting delay sub-circuit, the output of booting delay sub-circuit
End connects the EN pins of the backlight driving chip.Since booting delay sub-circuit is pre- from enable signal end inputs enabled voltage
The enabled voltage is exported to the EN pins of the backlight driving chip after fixed second duration, opens the backlight driving chip；
After backlight driving chip is opened, charging delay sub-circuit is predetermined the from the operating voltage end input service voltage of backlight driving chip
Cut-in voltage is exported to open the triode to the base stage of triode after one duration；Under triode open state, if backlight
Driving chip is abnormal, and the shutdown signal of FAIL pins output is transmitted to described in the EN pins closing of the backlight driving chip
Backlight driving chip；And after backlight driving chip closing, the shutdown signal of FAIL pins output stops, of booting delay at this time
Circuit is defeated to the EN pins of the backlight driving chip again after predetermined second duration from enable signal end inputs enabled voltage
Go out the enabled voltage, to open the backlight driving chip, and backlight driving chip is abnormal at this time, then FAIL pins are again
The shutdown signal of secondary output, such loop control, in the case of capable of realizing no MCU controls, backlight driving chip is different in power supply
It is restarted after often closing, is conducive to device miniaturization.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be in embodiment or description of the prior art
Required attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the present invention
Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram for backlight module that the prior art provides.
Fig. 2 is a kind of structural schematic diagram for backlight module power protecting circuit that the embodiment of the present invention provides.
Fig. 3 is a kind of structural schematic diagram for backlight module power protecting circuit that another embodiment of the present invention provides.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
With reference to Fig. 2, the embodiment of the present invention provides a kind of backlight module power protecting circuit 2, including：Triode 21 fills
Electricity delay sub-circuit 22, booting delay sub-circuit 23；
The operating voltage end Vreg of the input terminal connection backlight driving chip 1 of charging delay sub-circuit 22, charging delay
The output end of circuit 22 is connected to the base stage of triode 21, charging delay operating voltage of the sub-circuit 22 from backlight driving chip 1
Cut-in voltage is exported to open triode 21 to the base stage of triode 21 after holding Vreg input service voltages to play predetermined first duration；
The FAIL pins of the emitter connection backlight drive core 1 of triode 21, the collector and backlight drive of triode 21
The EN pins of chip 1 connect；
The input terminal of booting delay sub-circuit 23 connects enable signal end DISP_EN, the output of booting delay sub-circuit 23
The EN pins of end connection backlight driving chip 1；Booting delay sub-circuit 23 is from enable signal end DISP_EN inputs enabled voltage
It is exported to the EN pins of backlight driving chip 1 after predetermined second duration and enables voltage, open backlight driving chip 1；In triode
Under 21 open states, the shutdown signal of FAIL pins output is transmitted to the EN pins closing backlight drive core of backlight driving chip 1
Piece.
In the backlight module power protecting circuit that said program provides, including following connection structure：Charging delay sub-circuit
Input terminal connection backlight driving chip operating voltage end, the output end of charging delay sub-circuit is connected to the base of triode
Pole；The emitter of triode connects the FAIL pins of the backlight drive core, and the collector of the triode drives with the backlight
The EN pins connection of dynamic chip；The input terminal connection enable signal end of booting delay sub-circuit, the output of booting delay sub-circuit
End connects the EN pins of the backlight driving chip.Since booting delay sub-circuit is pre- from enable signal end inputs enabled voltage
The enabled voltage is exported to the EN pins of the backlight driving chip after fixed second duration, opens the backlight driving chip；
After backlight driving chip is opened, charging delay sub-circuit is predetermined the from the operating voltage end input service voltage of backlight driving chip
Cut-in voltage is exported to open the triode to the base stage of triode after one duration；Under triode open state, if backlight
Driving chip is abnormal, and the shutdown signal of FAIL pins output is transmitted to described in the EN pins closing of the backlight driving chip
Backlight driving chip；And after backlight driving chip closing, the shutdown signal of FAIL pins output stops, of booting delay at this time
Circuit is defeated to the EN pins of the backlight driving chip again after predetermined second duration from enable signal end inputs enabled voltage
Go out the enabled voltage, to open the backlight driving chip, and backlight driving chip is abnormal at this time, then FAIL pins are again
The shutdown signal of secondary output, such loop control, in the case of capable of realizing no MCU controls, backlight driving chip is different in power supply
It is restarted after often closing, is conducive to device miniaturization.
Another embodiment of the present invention provides a kind of backlight module power protecting circuit, with reference to shown in Fig. 3,
Charging delay sub-circuit 22 include：Resistance R1, capacitance C1 and capacitance C2；The first end connection charging delay of resistance R1
The input terminal of sub-circuit 21, the output end of the second end connection charging delay sub-circuit 22 of R1；One end connection charging delay of C1
22 output end of sub-circuit, the other end are grounded GND；One end connection charging delay 22 output end of sub-circuit of the C2, another termination
Ground GND.
Booting delay sub-circuit 23 include：Resistance R4, capacitance C3；The booting delay sub-circuit of the first end connection of resistance R4
23 input terminal, the output end of the booting delay sub-circuit 23 of the second end connection of resistance R4；The booting of the one end capacitance C3 connection
The output end of delay sub-circuit 23, the other end are grounded GND.
To make the base stage input voltage of triode meet the threshold voltage requirements of the unlatching of triode 21, the base of triode 21
Series resistance R2 between pole and the output end of charging delay sub-circuit 21, the base stage of triode 21 are also grounded GND by resistance R3.
The voltage value of the base stage of input triode can be wherein adjusted by adjusting the resistance value ratio of R2 and R3.
In addition, the charging time (the second duration) that enable signal end DISP_EN is charged by resistance R4 to capacitance C3 is more than
Discharge time after the closing of backlight driving chip 1, so that backlight driving chip 1 can be completed to discharge in the off state, from
And it is powered on again when backlight driving chip 1 being avoided not complete electric discharge in the off state and causes wafer damage.The work electricity of Vreg
Pressure is the operating voltage inside backlight driving chip 1, which only enables (i.e. backlight driving chip in backlight driving chip
Start) after just have a voltage output, i.e., only exported to EN pins in DISP_EN and enable voltage so that backlight driving chip 1 is opened
Just having Vreg just afterwards has voltage value output, to ensure during the shutdown signal that FAIL pins export, again to backlight driving chip 1
Before secondary unlatching, C1 and C2 are substantially discharged and finish.In addition, R1, C1, C2 constitute charging delay sub-circuit, charging time (first
Duration) it is adjusted by the parameter value of R1, C1, C2, the charging time is to ensure to play the back of the body from rigid start-up operation in backlight control chip
After (high level) is completed in the FAIL output pins initialization of photocontrol chip, the base stage of triode reaches cut-in voltage (high level).
Based on above-mentioned circuit diagram shown in Fig. 3, its operation principle is described as follows：
When backlight driving chip starts：Because of Vreg no-voltages, triode 21 is closed.The backlight module power supply is protected
Protection circuit is failure to actuate, after the EN pins of backlight driving chip charge to high level (enabled voltage) by DISP_EN, backlight drive
Chip normally starts.
After backlight driving chip starts：FAIL pins export high level, and Vreg input service voltages, charging delay
Circuit 22 is from the operating voltage end Vreg input service voltages of backlight driving chip 1 to triode 21 after predetermined first duration
Base stage exports cut-in voltage to open triode 21.
When backlight driving chip exception：FAIL pins become low level (shutdown signal), and triode 21 drags down EN after opening
The signal of pin, backlight control chip are closed, and Vreg no-voltages, C1 and C2 start to discharge.
By after a certain period of time, backlight driving chip exports discharge off.And after R4, C3 charging complete, EN pins are again
Become high level, backlight driving chip restarting.
The embodiment of the present invention provides a kind of mobile unit, including LCD module 3, backlight driving chip 1 and above-mentioned times
One backlight module power protecting circuit 2.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (5)
1. a kind of backlight module power protecting circuit, which is characterized in that including：Triode, charging delay sub-circuit, booting delay
Sub-circuit；
The operating voltage end of the input terminal connection backlight driving chip of charging delay sub-circuit, the output end of charging delay sub-circuit
It is connected to the base stage of triode, charging delay sub-circuit is predetermined from the operating voltage end input service voltage of backlight driving chip
Cut-in voltage is exported to open the triode to the base stage of triode after first duration；
The emitter of triode connects the FAIL pins of the backlight driving chip, the collector of the triode and the backlight
The EN pins of driving chip connect；
The input terminal connection enable signal end of booting delay sub-circuit, the output end of booting delay sub-circuit connect the backlight and drive
The EN pins of dynamic chip；Booting delay sub-circuit is from enable signal end inputs enabled voltage to the back of the body after predetermined second duration
The EN pins of optical drive chip export the enabled voltage, open the backlight driving chip；Under triode open state,
The EN pins that the shutdown signal of FAIL pins output is transmitted to the backlight driving chip close the backlight driving chip.
2. backlight module power protecting circuit according to claim 1, which is characterized in that
Charging delay sub-circuit include：Resistance R1, capacitance C1 and capacitance C2；
The first end of the resistance R1 connects the input terminal of the charging delay sub-circuit, is filled described in the second end connection of the R1
The output end of electricity delay sub-circuit；
One end of the C1 connects the charging delay sub-circuit output end, other end ground connection；
One end of the C2 connects the charging delay sub-circuit output end, other end ground connection.
3. backlight module power protecting circuit according to claim 1, which is characterized in that
Series resistance R2 between the base stage of the triode and the output end of the charging delay sub-circuit, the base of the triode
Pole is also grounded by resistance R3.
4. according to claim 1-3 any one of them backlight module power protecting circuits, which is characterized in that
Booting delay sub-circuit include：Resistance R4, capacitance C3；
The input terminal of the booting delay sub-circuit of the first end connection of the resistance R4, the second end connection of the resistance R4 are opened
The output end of machine delay sub-circuit；
The output end of the booting delay sub-circuit of the one end capacitance C3 connection, other end ground connection；
Wherein, putting after enable signal end is more than backlight driving chip closing by resistance R4 to the charging time of capacitance C3
The electric time.
5. a kind of mobile unit, which is characterized in that including LCD module, backlight driving chip and such as claim 1-4 any one
Backlight module power protecting circuit described in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710142080.8A CN108574260A (en) | 2017-03-10 | 2017-03-10 | A kind of backlight module power protecting circuit and mobile unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710142080.8A CN108574260A (en) | 2017-03-10 | 2017-03-10 | A kind of backlight module power protecting circuit and mobile unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108574260A true CN108574260A (en) | 2018-09-25 |
Family
ID=63577223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710142080.8A Pending CN108574260A (en) | 2017-03-10 | 2017-03-10 | A kind of backlight module power protecting circuit and mobile unit |
Country Status (1)
| Country | Link |
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| CN (1) | CN108574260A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109587423A (en) * | 2018-09-28 | 2019-04-05 | 深圳市鼎盛光电有限公司 | Back-light starting circuit |
| CN110086219A (en) * | 2019-04-12 | 2019-08-02 | 出门问问信息科技有限公司 | A kind of charging base |
| CN111277255A (en) * | 2020-03-20 | 2020-06-12 | Tcl华星光电技术有限公司 | Time sequence control system and display panel |
| CN114120927A (en) * | 2021-12-06 | 2022-03-01 | Tcl华星光电技术有限公司 | Backlight module and display device |
-
2017
- 2017-03-10 CN CN201710142080.8A patent/CN108574260A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109587423A (en) * | 2018-09-28 | 2019-04-05 | 深圳市鼎盛光电有限公司 | Back-light starting circuit |
| CN109587423B (en) * | 2018-09-28 | 2023-11-21 | 深圳市鼎盛光电有限公司 | Backlight starting circuit |
| CN110086219A (en) * | 2019-04-12 | 2019-08-02 | 出门问问信息科技有限公司 | A kind of charging base |
| CN111277255A (en) * | 2020-03-20 | 2020-06-12 | Tcl华星光电技术有限公司 | Time sequence control system and display panel |
| CN114120927A (en) * | 2021-12-06 | 2022-03-01 | Tcl华星光电技术有限公司 | Backlight module and display device |
| US11996057B2 (en) | 2021-12-06 | 2024-05-28 | Tcl China Star Optoelectronics Technology Co., Ltd. | Backlight module and display device |
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Application publication date: 20180925 |