CN107481678A - Backlight drive current monitoring circuit, method and the display device of backlight module - Google Patents
Backlight drive current monitoring circuit, method and the display device of backlight module Download PDFInfo
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- CN107481678A CN107481678A CN201710828470.0A CN201710828470A CN107481678A CN 107481678 A CN107481678 A CN 107481678A CN 201710828470 A CN201710828470 A CN 201710828470A CN 107481678 A CN107481678 A CN 107481678A
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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
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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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The present invention provides a kind of backlight drive current monitoring circuit, method and the display device of backlight module.The backlight drive current monitoring circuit of the backlight module includes：The backlight drive current output terminal connection of the backlight drive current supplying circuit of resistance unit, first end and backlight module, the second end is connected with the backlight drive current input terminal of the backlight module；And, driving voltage monitoring unit, judge backlight drive electric current that the backlight drive current input terminal of the backlight module accesses whether in predetermined backlight drive current range for detecting the voltage between the first end of the resistance unit and the second end of the resistance unit, and according to the voltage.The present invention solve the problems, such as in the prior art can not be easily and effectively carry out backlight rosin joint investigation and power IC self-test.
Description
Technical field
The present invention relates to, more particularly to a kind of backlight drive current monitoring technique field, more particularly to a kind of backlight module
Backlight drive current monitoring circuit, method and display device.
Background technology
In existing display device, the backlight drive current supplying circuit of backlight drive electric current is provided for backlight module
(the backlight drive current supplying circuit typically can be that Power (power supply) IC (Integrated Circuit, integrates electricity
Road)) it is generally positioned on PCB (Printed Circuit Board, printed circuit board (PCB)), PCB side is sticked and has FPC
(Flexible Printed Circuit, flexible PCB), PCB are provided with the first connector (first company being connected with FPC
Connect device be used for by the backlight drive electric currents that provide of the first output pin out-put supply IC to FPC), FPC with PCB provided with being connected
The second connector, second connector passes through the backlight drive current input terminal electricity of the second output pin and the backlight module
Connection, to provide backlight drive electric current for the backlight module, to light the backlight module.However, the backlight module and
The pin being electrically connected between FPC may rosin joint, or the backlight drive current supplying circuit goes wrong in itself, all
Input to the display backlight driving current of the backlight drive current input terminal of the backlight module can be caused not driven in predetermined backlight
In the range of streaming current, although causing display terminal product normally to light, for a long time easily occur brightness be greatly lowered or
The phenomenon of open circuit.Existing backlight rosin joint investigation mode is that manually ammeter is connected in lighting system (between PCB and FPC
Series electrical flow table), it is necessary to which individually increase inspection operation wastes time and energy.
The content of the invention
It is an object of the invention to provide a kind of backlight drive current monitoring circuit of backlight module, method and display dress
Put, solve the problems, such as in the prior art can not be easily and effectively carry out backlight rosin joint investigation and power IC self-test.
In order to achieve the above object, the invention provides a kind of backlight drive current monitoring circuit of backlight module, including：
The backlight drive current output terminal of the backlight drive current supplying circuit of resistance unit, first end and backlight module connects
Connect, the second end is connected with the backlight drive current input terminal of the backlight module；And
Driving voltage monitoring unit, for detect the resistance unit first end and the resistance unit the second end it
Between voltage, and according to the voltage judge the backlight module backlight drive current input terminal access backlight drive electric current be
It is no in predetermined backlight drive current range.
Specifically, the backlight drive current monitoring circuit of backlight module of the present invention also includes：Alarm unit, with institute
The connection of driving voltage monitoring unit is stated, for determining the backlight drive of the backlight module when the driving voltage monitoring unit
Alarm signal is sent when the backlight drive electric current of current input terminal access is not in predetermined backlight drive current range.
Specifically, the second end ground connection of the resistance unit；
The predetermined backlight drive current range is less than or equal to the first predetermined backlight drive electric current and is more than or equal to
Second predetermined backlight drive electric current；The first predetermined backlight drive electric current is more than the described second predetermined backlight drive electric current；
The driving voltage monitoring unit includes：
Predetermined voltage provides module, for providing the first predetermined drive voltages and the second predetermined drive voltages；
First voltage comparison module, provide module with the first end of the resistance unit and the predetermined voltage and be connected, use
Voltage and first predetermined drive voltages in the first end of the resistance unit, obtain the first comparative result, and lead to
Cross first voltage and compare output end and export first comparative result；And
Second voltage comparison module, provide module with the first end of the resistance unit and the predetermined voltage and be connected, use
In the voltage and the second predetermined drive voltages of the first end of the resistance unit, the second comparative result is obtained, and pass through
Two voltage ratios export second comparative result compared with output end；
First predetermined drive voltages are equal to the resistance of the described first predetermined backlight drive electric current and the resistance unit
The product of value, second predetermined drive voltages are equal to the resistance of the described second predetermined backlight drive electric current and the resistance unit
The product of value.
Include specifically, the predetermined voltage provides module：
First divider resistance, first end are connected with power voltage input terminal；
Second divider resistance, first end are connected with the second end of first divider resistance；
3rd divider resistance, first end are connected with the second end of second divider resistance；
4th divider resistance, first end are connected with the second end of the 3rd divider resistance, the second end ground connection；And
Voltage-regulator diode, anode are connected with the second end of first divider resistance, minus earth；
The voltage at the second end of second divider resistance is the first predetermined drive voltages, the of the 3rd divider resistance
The voltage at two ends is the second predetermined drive voltages；
The first voltage comparison module includes：First voltage comparator, the of normal phase input end and the resistance unit
One end is connected, and inverting input is connected with the second end of second divider resistance, and output end is the first comparative result output end；
The second voltage comparison module includes：Second voltage comparator, normal phase input end and the 3rd divider resistance
The connection of the second end, inverting input is connected with the first end of the resistance unit, and output end is the second comparative result output end.
Specifically, the alarm unit includes：First control module, the second control module, the first alarm module and second
Alarm module, wherein,
First control module is connected with the first comparative result output end and first alarm module, for working as
Receive the first end for indicating the resistance unit voltage be more than first predetermined drive voltages the first comparative result when,
First alarm module is controlled to alarm；
Second control module is connected with the second comparative result output end and second alarm module, for working as
Receive the first end of the resistance unit voltage be less than second predetermined drive voltages the second comparative result when, control
The second alarm module alarm.
Specifically, first alarm module includes photodiode；The anode of the photodiode and power supply electricity
Press input connection；
First control module includes：First controlling transistor, control pole connect with the first comparative result output end
Connect, the first pole is connected with the negative electrode of the photodiode, the second pole ground connection.
Specifically, second alarm module includes buzzer；The first voltage input of the buzzer and the electricity
Source voltage input end connection；
Second control module includes：Second controlling transistor, control pole connect with the second comparative result output end
Connect, the first pole is connected with the second voltage input of the buzzer, the second pole ground connection.
Present invention also offers a kind of backlight drive current monitoring method of backlight module, using above-mentioned backlight module
Backlight drive current monitoring circuit carries out backlight drive current monitoring, including：
Voltage between the first end of driving voltage monitoring unit detection resistance unit and the second end of the resistance unit,
And judged the backlight drive electric current of the backlight drive current input terminal access of backlight module whether in predetermined backlight according to the voltage
In drive current range.
Specifically, the backlight drive current monitoring circuit of the backlight module also includes alarm unit, the backlight module
Backlight drive current monitoring method also include：
When the driving voltage monitoring unit determines the back of the body of the backlight drive current input terminal access of the backlight module
When CD-ROM drive streaming current is not in predetermined backlight drive current range, alarm unit sends alarm signal.
Present invention also offers the backlight drive current monitoring circuit of a kind of display device, including above-mentioned backlight module.
Compared with prior art, backlight drive current monitoring circuit, method and the display of backlight module of the present invention
Device is series at the backlight drive current output terminal and the back of the body of the backlight drive current supplying circuit of backlight module using resistance unit
It is directly proportional to the backlight drive electric current so as to the voltage at resistance unit both ends between the drive circuit input of optical mode group, lead to
The voltage for crossing detection and comparison resistance unit both ends can determine whether the backlight that the backlight drive current input terminal of backlight module accesses
Whether driving current is normal, you can carries out the investigation of backlight rosin joint and carries out power IC self-test, is not required to be separately provided
Inspection operation.
Brief description of the drawings
Fig. 1 is the structure chart of the backlight drive current monitoring circuit of the backlight module described in the embodiment of the present invention；
Fig. 2 is the structure chart of the backlight drive current monitoring circuit of the backlight module described in another embodiment of the present invention；
Fig. 3 is the structure chart of the backlight drive current monitoring circuit of the backlight module described in further embodiment of this invention；
Fig. 4 is the circuit of a specific embodiment of the backlight drive current monitoring circuit of another described backlight module of the invention
Figure.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
The transistor used in all embodiments of the invention can for triode, thin film transistor (TFT) or FET or its
His characteristic identical device.
As shown in figure 1, the backlight drive current monitoring circuit of the backlight module described in the embodiment of the present invention includes：
The backlight drive current output terminal of the backlight drive current supplying circuit of resistance unit 11, first end and backlight module
A connections, the second end are connected with the backlight drive current input terminal VIN of the backlight module；And
Driving voltage monitoring unit 12, for detect the resistance unit 11 first end and the resistance unit 11
Voltage between two ends, and according to the voltage judge the backlight module backlight drive current input terminal access backlight drive
Whether electric current is in predetermined backlight drive current range.
The backlight drive current monitoring circuit of backlight module described in the embodiment of the present invention is series at using resistance unit 11
The backlight drive current output terminal A of the backlight drive current supplying circuit of backlight module and the drive circuit input of backlight module
It is directly proportional to the backlight drive electric current so as to the voltage at the both ends of resistance unit 11 between B, pass through detection and comparison resistance unit
The voltage at 11 both ends is whether the backlight drive electric current for the backlight drive current input terminal access that can determine whether backlight module is normal.
In the specific implementation, the first end of the resistance unit 11 can be with driving IC backlight drive current output terminal to connect
Connect, (in the specific implementation, the second end of the resistance unit 11 can be connected with the first output pin of first connector
Second end of the resistance unit 11 is connected by wire with the first output pin of first connector, also i.e. by resistance list
Member 11 is sealed in for electrically connecting the backlight drive current output terminal of the driving IC and the first efferent duct of first connector
On the wire of pin), resistance unit 11 is sealed in backlight drive loop, therefore flow through the electric current i.e. backlight of the resistance unit 11
The backlight drive electric current of module access.
The backlight drive current monitoring circuit of backlight module described in the embodiment of the present invention is by using being series at backlight mould
Between the backlight drive current output terminal A of backlight drive current supplying circuit and the drive circuit input B of backlight module of group
Resistance unit 11, be that can determine whether the backlight drive electric current of backlight module by the voltage at detection and the both ends of comparison resistance unit 11
Whether the backlight drive electric current of input access is normal, you can carries out the investigation of backlight rosin joint and carries out power supply IC self-tests, no
Inspection operation need to be separately provided.
In practical operation, the resistance unit 11 can be arranged on PCB, and the driving voltage monitoring unit 12 can be with
It is arranged on PCB.
Preferably, as shown in Fig. 2 the backlight drive current monitoring circuit of the backlight module described in the embodiment of the present invention may be used also
With including：Alarm unit 13, it is connected with the driving voltage monitoring unit 12, for sentencing when the driving voltage monitoring unit 12
Break to the backlight module backlight drive current input terminal access backlight drive electric current not in predetermined backlight drive electric current model
Alarm signal is sent when enclosing interior.
In the preferred case, the backlight drive current monitoring circuit of the backlight module described in the embodiment of the present invention sets up alarm
Unit 13, it can be reminded in the case of backlight drive current anomaly and be not required to individually increase inspection operation.
In practical operation, the predetermined backlight drive current range for example can be more than or equal to 35mA (milliampere) simultaneously
Less than or equal to 45mA, but not limited to this, when size or the model change of backlight module, the predetermined backlight drive electric current
Scope can change.
According to a kind of embodiment, as shown in figure 3, the second end of the resistance unit 11 is connected with ground terminal GND；
The predetermined backlight drive current range is less than or equal to the first predetermined backlight drive electric current and is more than or equal to
Second predetermined backlight drive electric current；The first predetermined backlight drive electric current is more than the described second predetermined backlight drive electric current；
The driving voltage monitoring unit 12 includes：
Predetermined voltage provides module 121, for providing the first predetermined drive voltages V1 and the second predetermined drive voltages V2；
First voltage comparison module 122, module 121 is provided with the first end of the resistance unit 11 and the predetermined voltage
Connection, voltage and the first predetermined drive voltages V1 for the first end of the resistance unit 11, obtains the first ratio
Relatively result, and output end vo ut1 is compared by first voltage and exports first comparative result；And
Second voltage comparison module 123, module 121 is provided with the first end of the resistance unit 11 and the predetermined voltage
Connection, for the voltage and the second predetermined drive voltages V2 of the first end of the resistance unit 11, obtains second and compares knot
Fruit, and output end vo ut2 is compared by second voltage and exports second comparative result；
The first predetermined drive voltages V1 is equal to the described first predetermined backlight drive electric current and the resistance unit 11
The product of resistance value, the second predetermined drive voltages V2 are equal to the described second predetermined backlight drive electric current and the resistance unit
The product of 11 resistance value.
In specific embodiment as shown in Figure 3, the second end of resistance unit 11 is grounded, then the two of the resistance unit 11
The voltage at end is the voltage of the first end equal to the resistance unit 11, and it is pre- to provide the offer first of module 121 by predetermined voltage
Determine driving voltage V1 and the second predetermined drive voltages V2, the first end of the comparison resistance unit 11 of first voltage comparison module 122
Voltage and the first predetermined drive voltages V1, the voltage of the first end of the comparison resistance unit 11 of second voltage comparison module 123 and
Two predetermined drive voltages V2.
It can include specifically, the predetermined voltage provides module：
First divider resistance, first end are connected with power voltage input terminal；
Second divider resistance, first end are connected with the second end of first divider resistance；
3rd divider resistance, first end are connected with the second end of second divider resistance；
4th divider resistance, first end are connected with the second end of the 3rd divider resistance, the second end ground connection；And
Voltage-regulator diode, anode are connected with the second end of first divider resistance, minus earth；
The voltage at the second end of second divider resistance is the first predetermined drive voltages, the of the 3rd divider resistance
The voltage at two ends is the second predetermined drive voltages；
The first voltage comparison module includes：First voltage comparator, the of normal phase input end and the resistance unit
One end is connected, and inverting input is connected with the second end of second divider resistance, and output end is the first comparative result output end；
The second voltage comparison module includes：Second voltage comparator, normal phase input end and the 3rd divider resistance
The connection of the second end, inverting input is connected with the first end of the resistance unit, and output end is the second comparative result output end.
In practical operation, first divider resistance and the voltage-regulator diode form mu balanced circuit, and main function is
Reduce the influence of environment and circuit to the stability of the current potential at the second end of the first divider resistance in itself, to ensure circuit precision；
By the selection of supply voltage and each divider resistance, the anti-phase defeated of the first voltage comparison module can be caused
Enter to terminate and access the second predetermined drive voltages into the first predetermined drive voltages, the normal phase input end of second voltage comparison module.
Specifically, the alarm unit can include：First control module, the second control module, the first alarm module and
Second alarm module, wherein,
First control module is connected with the first comparative result output end and first alarm module, for working as
Receive the first end for indicating the resistance unit voltage be more than first predetermined drive voltages the first comparative result when,
First alarm module is controlled to alarm；
Second control module is connected with the second comparative result output end and second alarm module, for working as
Receive the first end of the resistance unit voltage be less than second predetermined drive voltages the second comparative result when, control
The second alarm module alarm.
According to a kind of embodiment, first alarm module can include photodiode；The photodiode
Anode be connected with the power voltage input terminal；
First control module includes：First controlling transistor, control pole connect with the first comparative result output end
Connect, the first pole is connected with the negative electrode of the photodiode, the second pole ground connection.
When the control pole of first controlling transistor controls the first controlling transistor conducting, the pole of photoelectricity two
The minus earth of pipe, then photodiode is luminous with alarm.When the control pole of first controlling transistor controls described first
When controlling transistor disconnects, the negative electrode of the photodiode does not connect with ground terminal, and the photodiode does not light.
In practical operation, first controlling transistor, second controlling transistor can be triode, now should
Control extremely base stage, the first extremely emitter stage or colelctor electrode, the second extremely colelctor electrode or emitter stage.
In practical operation, first controlling transistor, second controlling transistor can be metal-oxide-semiconductor (metal-oxygen
Compound-semiconductor field effect transistor) or TFT (thin film transistor (TFT)), the now control extremely grid, this first extremely source electrode or
Drain electrode, this second extremely drain electrode or source electrode.
According to a kind of embodiment, second alarm module includes buzzer；The first voltage of the buzzer
Input is connected with the power voltage input terminal；
Second control module includes：Second controlling transistor, control pole connect with the second comparative result output end
Connect, the first pole is connected with the second voltage input of the buzzer, the second pole ground connection.
When the control pole of second controlling transistor controls the second controlling transistor conducting, the buzzer
Second voltage input end grounding, so as to the buzzer ON operation, buzzing is sent to alarm.When the described second control crystal
When the control pole of pipe controls the second controlling transistor disconnection, the second voltage input of the buzzer does not connect with ground terminal
Logical, so as to which the buzzer is in off state, the buzzer does not work.
Illustrate the backlight drive current monitoring circuit of backlight module of the present invention below by a specific embodiment.
An as shown in figure 4, specific embodiment bag of the backlight drive current monitoring circuit of backlight module of the present invention
Include resistance unit, driving voltage monitoring unit and alarm unit；
The resistance unit includes detection resistance RD, the first end of the detection resistance RD and the backlight drive of backlight module
The backlight drive current output terminal A connections of current supplying circuit, the second end and the drive circuit input B of the detection resistance RD
Connection；
First output pin of drive circuit input B and the first connector being arranged on PCB (printed circuit board (PCB)) (figure
Not shown in 4) connection, the first output pin of first connector is connected with the second connector being arranged on FPC, described
Second connector is connected by the backlight drive current input terminal of the second output pin and backlight module；
The driving voltage monitoring unit includes predetermined voltage and provides module, first voltage comparison module and second voltage ratio
Compared with module；
The alarm unit includes the first control module, the second control module, the first alarm module and the second alarm module；
The predetermined voltage, which provides module, to be included：
First divider resistance Rf1, first end are connected with input supply voltage VCC power voltage input terminal；
Second divider resistance Rf2, first end are connected with the second end of the first divider resistance Rf1；
3rd divider resistance Rf3, first end are connected with the second end of the second divider resistance Rf2；
4th divider resistance Rf4, first end are connected with the second end of the 3rd divider resistance Rf3, the second end and ground terminal
GND connections；And
Voltage-regulator diode D1, anode are connected with the second end of the first divider resistance Rf1, and negative electrode is connected with ground terminal GND；
The voltage at the second end of the second divider resistance Rf2 is the first predetermined drive voltages V1, and the 3rd partial pressure is electric
The voltage for hindering Rf3 the second end is the second predetermined drive voltages V2；
The first voltage comparison module includes：First voltage comparator A1, normal phase input end and the detection resistance RD
First end connection, inverting input is connected with the second end of the second divider resistance Rf2, and output end compares for described first
As a result output end vo ut1；
The second voltage comparison module includes：Second voltage comparator A2, normal phase input end and the 3rd partial pressure electricity
Rf3 the second end connection is hindered, inverting input is connected with the first end of the detection resistance RD, and output end is the second described ratio
Compared with result output end vo ut2；
The alarm unit includes the first control module, the second control module, the first alarm module and the second alarm module；
First alarm module includes photodiode LED1；Photodiode LED1 anode and the input electricity
Source voltage VCC power voltage input terminal connection；
First control module includes：First control triode Q1, base stage and the first comparative result output end
Vout1 connections, colelctor electrode are connected with the negative electrode of the photodiode LED1, and emitter stage is connected with ground terminal GND；
Second alarm module includes buzzer LS1；The first voltage input of the buzzer LS1 and the input
Supply voltage VCC power voltage input terminal connection；
Second control module includes：Second controlling transistor Q2, base stage and the second comparative result output end
Vout2 connections, colelctor electrode are connected with the second voltage input of the buzzer LS1, and emitter stage is connected with ground terminal GND.
In the specific embodiment shown in Fig. 4, Q1 and Q2 are NPN type triode, and V1 is more than V2.
In practical operation, Q1 and Q2 can also be PNP type triode, it is only necessary to corresponding conversion control signal.
In practical operation, Q1 and Q2 can also be thin film transistor (TFT) or field-effect transistor.
The specific embodiment of the backlight drive current monitoring circuit of present invention backlight module as shown in Figure 4 at work,
Detection resistance RD the second end is connected with ground terminal GND, then the voltage of first end of the voltage at detection resistance RD both ends equal to RD, RD
First end and A1 normal phase input end and A2 inverting input connect；
When the voltage of RD first end is more than V1, A1 exports high level by Vout1, and Q1 is turned on, LED1 ON operations,
LED1 is luminous to export low level with alarm, A2 by Vout2, and Q2 disconnects, and LS1 is in off state, and LS1 does not work；
When the voltage of RD first end is less than V2, A1 exports low level by Vout1, and Q1 disconnects, and LED1 does not work,
LED1 is luminous to export high level with alarm, A2 by Vout2, and Q2 is turned on, LS1 ON operations, and LS1 beeps to alarm；
When the voltage of RD first end is less than V1 more than V2, A1 exports low level by Vout1, and A2 passes through Vout2
Low level is exported, LED1 and LS1 do not work.
The specific embodiment of the backlight drive current monitoring circuit of present invention backlight module as shown in Figure 4 can be to backlight
Problem of faulty soldering is investigated, and carries out self-test to the power supply IC damage problems on PCB, is looked into applied to the basic point lamp inspection before shipment
In, backlight problem of faulty soldering can effectively be investigated on the basis of process station is not increased, and additional supply IC self-test work(
To increase the degree of accuracy the bad display device of backlight rosin joint can be avoided to come into the market.
The backlight drive current monitoring method of backlight module described in the embodiment of the present invention, using above-mentioned backlight module
Backlight drive current monitoring circuit carries out backlight drive current monitoring, the backlight drive current monitoring method bag of the backlight module
Include：
Voltage between the first end of driving voltage monitoring unit detection resistance unit and the second end of the resistance unit,
And judged the backlight drive electric current of the backlight drive current input terminal access of backlight module whether in predetermined backlight according to the voltage
In drive current range.
Preferably, the backlight drive current monitoring circuit of the backlight module also includes alarm unit, the backlight module
Backlight drive current monitoring method also include：
When the driving voltage monitoring unit determines the back of the body of the backlight drive current input terminal access of the backlight module
When CD-ROM drive streaming current is not in predetermined backlight drive current range, alarm unit sends alarm signal.
Display device described in the embodiment of the present invention includes the backlight drive current monitoring circuit of above-mentioned backlight module.
Described above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, on the premise of principle of the present invention is not departed from, some improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
- A kind of 1. backlight drive current monitoring circuit of backlight module, it is characterised in that including：The backlight drive current output terminal connection of the backlight drive current supplying circuit of resistance unit, first end and backlight module, Second end is connected with the backlight drive current input terminal of the backlight module；AndDriving voltage monitoring unit, for detecting between the first end of the resistance unit and the second end of the resistance unit Voltage, and according to the voltage judge the backlight module backlight drive current input terminal access backlight drive electric current whether In predetermined backlight drive current range.
- 2. the backlight drive current monitoring circuit of backlight module as claimed in claim 1, it is characterised in that also include：Alarm Unit, it is connected with the driving voltage monitoring unit, for determining the backlight module when the driving voltage monitoring unit Backlight drive current input terminal access backlight drive electric current not in predetermined backlight drive current range when send alarm signal Number.
- 3. the backlight drive current monitoring circuit of backlight module as claimed in claim 2, it is characterised in that the resistance unit The second end ground connection；The predetermined backlight drive current range is less than or equal to the first predetermined backlight drive electric current and more than or equal to second Predetermined backlight drive electric current；The first predetermined backlight drive electric current is more than the described second predetermined backlight drive electric current；The driving voltage monitoring unit includes：Predetermined voltage provides module, for providing the first predetermined drive voltages and the second predetermined drive voltages；First voltage comparison module, provide module with the first end of the resistance unit and the predetermined voltage and be connected, for than The voltage of the first end of the resistance unit and first predetermined drive voltages, obtain the first comparative result, and pass through the One voltage ratio exports first comparative result compared with output end；AndSecond voltage comparison module, provide module with the first end of the resistance unit and the predetermined voltage and be connected, for than The voltage of the first end of the resistance unit and the second predetermined drive voltages, the second comparative result is obtained, and pass through the second electricity Pressure ratio exports second comparative result compared with output end；First predetermined drive voltages are equal to the described first predetermined backlight drive electric current and the resistance value of the resistance unit Product, second predetermined drive voltages are equal to the described second predetermined backlight drive electric current and the resistance value of the resistance unit Product.
- 4. the backlight drive current monitoring circuit of backlight module as claimed in claim 3, it is characterised in that the predetermined voltage There is provided module includes：First divider resistance, first end are connected with power voltage input terminal；Second divider resistance, first end are connected with the second end of first divider resistance；3rd divider resistance, first end are connected with the second end of second divider resistance；4th divider resistance, first end are connected with the second end of the 3rd divider resistance, the second end ground connection；AndVoltage-regulator diode, anode are connected with the second end of first divider resistance, minus earth；The voltage at the second end of second divider resistance is the first predetermined drive voltages, the second end of the 3rd divider resistance Voltage be the second predetermined drive voltages；The first voltage comparison module includes：First voltage comparator, the first end of normal phase input end and the resistance unit Connection, inverting input are connected with the second end of second divider resistance, and output end is the first comparative result output end；The second voltage comparison module includes：Second voltage comparator, the of normal phase input end and the 3rd divider resistance Two ends are connected, and inverting input is connected with the first end of the resistance unit, and output end is the second comparative result output end.
- 5. the backlight drive current monitoring circuit of backlight module as claimed in claim 4, it is characterised in that the alarm unit Including：First control module, the second control module, the first alarm module and the second alarm module, wherein,First control module is connected with the first comparative result output end and first alarm module, for when reception When being more than the first comparative result of first predetermined drive voltages to the voltage of the first end for indicating the resistance unit, control The first alarm module alarm；Second control module is connected with the second comparative result output end and second alarm module, for when reception When being less than the second comparative result of second predetermined drive voltages to the voltage of the first end of the resistance unit, described in control Second alarm module is alarmed.
- 6. the backlight drive current monitoring circuit of backlight module as claimed in claim 5, it is characterised in that first alarm Module includes photodiode；The anode of the photodiode is connected with the power voltage input terminal；First control module includes：First controlling transistor, control pole are connected with the first comparative result output end, the One pole is connected with the negative electrode of the photodiode, the second pole ground connection.
- 7. the backlight drive current monitoring circuit of backlight module as claimed in claim 5, it is characterised in that second alarm Module includes buzzer；The first voltage input of the buzzer is connected with the power voltage input terminal；Second control module includes：Second controlling transistor, control pole are connected with the second comparative result output end, the One pole is connected with the second voltage input of the buzzer, the second pole ground connection.
- A kind of 8. backlight drive current monitoring method of backlight module, using as described in any claim in claim 1 to 7 Backlight module backlight drive current monitoring circuit carry out backlight drive current monitoring, it is characterised in that including：Voltage between the first end of driving voltage monitoring unit detection resistance unit and the second end of the resistance unit, and root Judge the backlight drive electric current of the backlight drive current input terminal access of backlight module whether in predetermined backlight drive according to the voltage In current range.
- 9. the backlight drive current monitoring method of backlight module as claimed in claim 8, it is characterised in that the backlight module Backlight drive current monitoring circuit also include alarm unit, the backlight drive current monitoring method of the backlight module also wraps Include：The backlight that the backlight drive current input terminal access of the backlight module is determined when the driving voltage monitoring unit is driven When streaming current is not in predetermined backlight drive current range, alarm unit sends alarm signal.
- 10. a kind of display device, it is characterised in that including the backlight module as described in any claim in claim 1 to 7 Backlight drive current monitoring circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710828470.0A CN107481678A (en) | 2017-09-14 | 2017-09-14 | Backlight drive current monitoring circuit, method and the display device of backlight module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710828470.0A CN107481678A (en) | 2017-09-14 | 2017-09-14 | Backlight drive current monitoring circuit, method and the display device of backlight module |
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| CN107481678A true CN107481678A (en) | 2017-12-15 |
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| CN201710828470.0A Pending CN107481678A (en) | 2017-09-14 | 2017-09-14 | Backlight drive current monitoring circuit, method and the display device of backlight module |
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