CN206024167U - A kind of test device of liquid crystal display LED-backlit - Google Patents
A kind of test device of liquid crystal display LED-backlit Download PDFInfo
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- CN206024167U CN206024167U CN201620920383.9U CN201620920383U CN206024167U CN 206024167 U CN206024167 U CN 206024167U CN 201620920383 U CN201620920383 U CN 201620920383U CN 206024167 U CN206024167 U CN 206024167U
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Abstract
The utility model discloses a kind of test device of liquid crystal display LED-backlit, including the first constant voltage source, ground terminal, audion Q1, Q2, Q3, Q4, resistor R1, calibrating terminal and alarm；The base stage of Q1 is connected with the negative pole of calibrating terminal, and the positive pole of the colelctor electrode of Q1 positive pole, the first constant voltage source and alarm respectively with calibrating terminal is connected, and the emitter stage of Q1 is connected with the base stage of Q2；The colelctor electrode of Q2, emitter stage negative pole respectively with alarm, ground terminal are connected, the base stage of Q3 is connected to ground terminal by resistor R1, the emitter stage of Q3, colelctor electrode are connected respectively to ground terminal, the first constant voltage source, and the negative pole of the emitter stage of Q4, base stage, colelctor electrode base stage, the first constant voltage source and calibrating terminal respectively with Q3 is connected.Whether nonlinear wind vibration of this patent using LED, effective detection LED have by damage by static electricity or reverse breakdown situation, reduce production cost, improve production efficiency and product yield.
Description
Technical field
This utility model is related to liquid crystal display production detection technique, more particularly to a kind of test of liquid crystal display LED-backlit
Device.
Background technology
In the prior art, it is under LED regular service conditionss, i.e., to the method detected by liquid crystal display LED-backlit
By which by the electric current of 20mA, its brightness and colour system is detected.But adopt said method, it is impossible to know whether LED has by static shock
Wound or reverse breakdown etc. have a strong impact on the situation of service life.If not detecting whether LED has by damage by static electricity or reverse breakdown,
The yield of LED will then lowered significantly, once defective products is flowed in client's handss, then can bring about great losses.
The longevity is used in order to know whether liquid crystal display LED-backlit has to be had a strong impact on by damage by static electricity or reverse breakdown etc.
The situation of life, general testing staff can be taken pictures using special installation instrument is actual, see the chip of LED whether have burning black or
Internal circuit has a phenomenon of disconnection, or the concrete composition of measurement LED is analyzing the life-span of LED and whether have static shock
Wound, but adopt with the expensive cost of upper type needs, and operate inconvenience, it is therefore desirable to a kind of new liquid crystal display LED-backlit
Test device.
Utility model content
Task of the present utility model is to provide a kind of test device of new liquid crystal display LED-backlit, can test LED due to
The situation that service life is had a strong impact on by damage by static electricity or reverse breakdown etc..For achieving the above object, this patent adopts following skill
Art scheme：
A kind of test device of liquid crystal display LED-backlit, it is characterised in that including the first constant voltage source, ground terminal, audion
Q1, audion Q2, audion Q3, audion Q4, resistor R1, calibrating terminal and alarm；The base stage of audion Q1 and test
The negative pole connection of terminal, the colelctor electrode of audion Q1 positive pole respectively with calibrating terminal, the first constant voltage source and alarm are just
Pole connects, and the emitter stage of audion Q1 is connected with the base stage of audion Q2；The colelctor electrode of audion Q2 is connected with the negative pole of alarm
Connect, the emitter stage of audion Q2 is connected with ground terminal, the base stage of audion Q3 is connected to ground terminal by resistor R1, audion Q3's
Emitter stage is connected to ground terminal, and the colelctor electrode of audion Q3 is connected to the first constant voltage source；The emitter stage and audion of audion Q4
The base stage connection of Q3, the base stage of audion Q4 are connected to the first constant voltage source, and the colelctor electrode of audion Q4 is negative with calibrating terminal
Pole connects.
Preferably, the test device of the liquid crystal display LED-backlit also includes rheostat R2, rheostat R3,
The rheostat R2 is connected between the base stage of negative pole and audion Q1 of calibrating terminal, and rheostat R3 is connection
Between the colelctor electrode and the first constant voltage source of audion Q3.
Preferably, the test device of the liquid crystal display LED-backlit also includes on-off circuit, one end of the on-off circuit
It is connected with the negative pole of calibrating terminal, the other end is connected with ground terminal, on-off circuit also includes a control end, by the control end control
The conducting and disconnection of on-off circuit processed.
Preferably, the on-off circuit includes audion Q5, audion Q6 and the second constant voltage source；Wherein, three pole
The colelctor electrode of pipe Q5 is connected with the negative pole of calibrating terminal, and the emitter stage of audion Q5 is connected with ground terminal, the base stage of audion Q5 with
The emitter stage connection of audion Q6, the base stage of audion Q6 are connected with control end, and the colelctor electrode of audion Q6 and the second constant pressure are electric
Source connects.
Preferably, the test device of the liquid crystal display LED-backlit also includes diode, and the Diode series are in three poles
On the branch road that the emitter stage of pipe Q1 is connected with the base stage of audion Q2.
Preferably, the type of the audion Q1, audion Q2, audion Q3, audion Q4, audion Q5 and audion Q6
Number it is C1815.
Preferably, the test device of the liquid crystal display LED-backlit also includes capacitor, capacitor one end connection three
The base stage of pole pipe Q1, one end is connected to ground terminal.
Preferably, the alarm is light emitting diode.
The test device of above-mentioned new liquid crystal display LED-backlit is employed, using the nonlinear wind vibration of LED, effectively
Whether detection LED has the situation for being had a strong impact on service life by damage by static electricity or reverse breakdown etc., reduces production cost, improves life
Produce efficiency and product yield.
Description of the drawings
Fig. 1 is the circuit diagram of the first embodiment of the test device of this utility model liquid crystal display LED-backlit；
Fig. 2 is the circuit diagram of the second embodiment of the test device of this utility model liquid crystal display LED-backlit；
Fig. 3 is the circuit diagram of the 3rd embodiment of the test device of this utility model liquid crystal display LED-backlit.
Specific embodiment
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings, but protection model of the present utility model
Enclose the scope for being not limited to embodiment statement.
Fig. 1 is refer to, Fig. 1 is the circuit of the first embodiment of the test device of this utility model liquid crystal display LED-backlit
Figure.
The test device of a kind of liquid crystal display LED-backlit of the present utility model, it is characterised in that including the first constant voltage source
A+, ground terminal, audion Q1, audion Q2, audion Q3, audion Q4, resistor R1, calibrating terminal T1 and alarm D1；Three
The base stage of pole pipe Q1 is connected with the negative pole of calibrating terminal T1, the colelctor electrode of audion Q1 positive pole respectively with calibrating terminal T1,
The positive pole connection of one constant voltage source A+ and alarm D1, the emitter stage of audion Q1 are connected with the base stage of audion Q2；Audion
The colelctor electrode of Q2 is connected with the negative pole of alarm D1, and the emitter stage of audion Q2 is connected with ground terminal, and the base stage of audion Q3 passes through
Resistor R1 is connected to ground terminal, and the emitter stage of audion Q3 is connected to ground terminal, and the colelctor electrode of audion Q3 is connected to the first constant pressure
Power supply A+；The emitter stage of audion Q4 is connected with the base stage of audion Q3, and the base stage of audion Q4 is connected to the first constant voltage source A
+, the colelctor electrode of audion Q4 is connected with the negative pole of calibrating terminal T1.
According to the diode characteristic of LED, when LED has very little electric current to pass through, such as 1 μ A, LED both end voltages can reach
The voltage of 1.6～2.2V.On the other hand, when electric current increases to 20mA, the both end voltage of LED is about 3V or so, it follows that
Increased by the electric current of LED, but the both end voltage change of LED is less.Using this characteristic, by about 1 μ A's in each LED
During electric current, detect whether the both end voltage of now LED is 1.9～2.2V, if the voltage for detecting is less than this scope, can be true
The wafer of this LED fixed is judged to defective products by damage by static electricity.
Specifically, tested LED is connected on calibrating terminal T1, wherein the positive pole of LED is just being connected to calibrating terminal T1
Extremely go up, the negative pole of LED is connected on the negative pole of calibrating terminal T1.Input voltage and electric current at the first constant voltage source A+, and adjust
Whole voltage and current is 1 μ A until the electric current for flowing through LED, and both end voltage is 1.6～2.0V.Now, audion Q1, audion Q2
It is not turned on, alarm D1 does not report to the police.Audion Q3, audion Q4 are turned on, and flow through the electric current of LED from through audion Q3, three poles
Pipe Q4 streams arrive ground terminal.When LED is defective products, when flowing through 1 μ A electric currents, both end voltage is about 1V, now, audion Q1, three poles
Pipe Q2 is turned on, and the positive pole of alarm D1 is connected to the first constant pressure source, and the negative pole of alarm D1 is connected to ground terminal by audion Q2,
Alarm D1 reports to the police.So as to remind tester, the LED is possible to by damage by static electricity or reverse breakdown.
Resistor R1 is arranged between the emitter stage of audion Q4 and ground terminal, is prevented effectively from due to the circuit caused by short circuit
Danger, is one of important devices of protection circuit normal work.
By such scheme, whether effective detection liquid crystal display LED-backlit has serious by damage by static electricity or reverse breakdown etc.
The situation of service life is affected, production cost, improve production efficiency and product yield is reduced.
In such scheme, can further increase rheostat R2, rheostat R3 in circuit, described can power transformation
Resistance device R2 is connected between the base stage of negative pole and audion Q1 of calibrating terminal, and rheostat R3 is to be connected to audion Q3
Colelctor electrode and the first constant voltage source between.
Specifically, rheostat R2, rheostat R3 are arranged in the current loop of LED.Change rheostat
R2, the resistance of rheostat R3, can adjust the electric current by LED, and such scheme improves this utility model liquid crystal display
The compatibility of the test device of LED-backlit and autgmentability, are easy to tester to be corrected circuit.
Please further refer to Fig. 2, Fig. 2 is the second embodiment of the test device of this utility model liquid crystal display LED-backlit
Circuit diagram.
Preferably, the test device of the liquid crystal display LED-backlit also includes on-off circuit 201, the on-off circuit 201
One end be connected with the negative pole of calibrating terminal T1, the other end is connected with ground terminal, and on-off circuit also includes control end T2, by institute
State the conducting and disconnection of control end T2 controlling switch circuit 201.
Specifically, control end T2 has high level or low level two states.Can arrange when control end T2 is high level, open
Powered-down road 201 turns on, and the negative pole of calibrating terminal T1 is conducting to ground terminal；When control end T2 is low level, on-off circuit 201 breaks
Open, the electric current that the negative pole of calibrating terminal T1 flows out does not flow into on-off circuit 201, and flows into audion Q4.In the same manner, can arrange when control
When end T2 processed is low level, on-off circuit 201 is turned on, and the negative pole of calibrating terminal T1 is conducting to ground terminal；When control end T2 is high electricity
At ordinary times, on-off circuit 201 disconnects, and the electric current that the negative pole of calibrating terminal T1 flows out does not flow into on-off circuit 201, and flows into audion
Q4.Above-mentioned control end T2 can be controlled its low and high level by single-chip microcomputer etc., how be controlled control end T2 with single-chip microcomputer
Low and high level belongs to prior art, will not be described here.
When on-off circuit 201 is conducting state, the electric current for flowing through LED arrives ground terminal through the stream of on-off circuit 201, at this moment
Wait, LED normal luminous, by such scheme, can complete to detect whether the brightness of LED normally detects operation, improve efficiency, section
About cost.
Please further refer to Fig. 3, Fig. 3 is the 3rd embodiment of the test device of this utility model liquid crystal display LED-backlit
Circuit diagram.
Preferably, the on-off circuit 201 includes audion Q5, audion Q6 and the second constant voltage source；Second constant pressure source
Voltage can be provided with 3.3V, wherein, the colelctor electrode of the audion Q5 is connected with the negative pole of calibrating terminal T1, audion Q5's
Emitter stage is connected with ground terminal, and the base stage of audion Q5 is connected with the emitter stage of audion Q6, the base stage and control end of audion Q6
T2 connects, and the colelctor electrode of audion Q6 is connected with the second constant voltage source.
Specifically, when control end T2 is high level, audion Q5 and audion Q6 conductings, the negative pole of calibrating terminal T1 are led
Lead to ground terminal；When control end T2 is low level, on-off circuit 201 disconnects.
Such scheme is a preferred version of on-off circuit, and circuit simply easily realizes that cost is extremely low.
Preferably, the test device of the liquid crystal display LED-backlit also includes diode D2, and the Diode series are three
On the branch road that the emitter stage of pole pipe Q1 is connected with the base stage of audion Q2.
Embodiment in figure 3, has connected two on the branch road that the emitter stage of audion Q1 is connected with the base stage of audion Q2
Individual diode D2.
Through experiment, diode D2 is set between audion Q1 and audion Q2 and ensures circuit safety and normal operation, subtracted
Few short-circuit risks that brings as audion Q1 or audion Q2 is damaged.
Preferably, the type of the audion Q1, audion Q2, audion Q3, audion Q4, audion Q5 and audion Q6
Number it is C1815.
Through experiment, the triode operation of model C 1815 is stable, low cost.
Preferably, the test device of the liquid crystal display LED-backlit also includes that capacitor C1, described capacitor C1 one end connect
The base stage of audion Q1 is connect, one end is connected to ground terminal.
Capacitor is set between the base stage and ground terminal of audion Q1, unwanted friendship in the first constant voltage source can be filtered
Stream composition, smooths unidirectional current, is conducive to device effectively to work.
Preferably, the alarm D1 is light emitting diode.Alarm D1 can be made using light emitting diode using multi-form
For alarm, testing staff's visual experience can be given, alarm signal can be known within the specific limits, and adopt light-emitting diodes
Pipe, cost are extremely low.
Above description is only the preferred embodiment and the explanation to institute's application technology principle of the application.Art technology
Personnel should be appreciated that involved utility model scope in the application, however it is not limited to which the particular combination of above-mentioned technical characteristic is formed
Technical scheme, while should also cover without departing from the utility model conceive in the case of, by above-mentioned technical characteristic or its etc.
Other technical schemes for combination in any being carried out with feature and being formed.Such as features described above and (but not limited to) disclosed herein
The technical scheme that there is the technical characteristic of similar functions to be replaced mutually and be formed.
Claims (8)
1. a kind of test device of liquid crystal display LED-backlit, it is characterised in that including the first constant voltage source, ground terminal, audion
Q1, audion Q2, audion Q3, audion Q4, resistor R1, calibrating terminal and alarm；The base stage of audion Q1 and test
The negative pole connection of terminal, the colelctor electrode of audion Q1 positive pole respectively with calibrating terminal, the first constant voltage source and alarm are just
Pole connects, and the emitter stage of audion Q1 is connected with the base stage of audion Q2；The colelctor electrode of audion Q2 is connected with the negative pole of alarm
Connect, the emitter stage of audion Q2 is connected with ground terminal, the base stage of audion Q3 is connected to ground terminal by resistor R1, audion Q3's
Emitter stage is connected to ground terminal, and the colelctor electrode of audion Q3 is connected to the first constant voltage source；The emitter stage and audion of audion Q4
The base stage connection of Q3, the base stage of audion Q4 are connected to the first constant voltage source, and the colelctor electrode of audion Q4 is negative with calibrating terminal
Pole connects.
2. the test device of liquid crystal display LED-backlit according to claim 1, it is characterised in that it also includes can power transformation
Resistance device R2, rheostat R3, the rheostat R2 be the negative pole and audion Q1 that are connected to calibrating terminal base stage it
Between, rheostat R3 is connected between the colelctor electrode of audion Q3 and the first constant voltage source.
3. the test device of liquid crystal display LED-backlit according to claim 2, it is characterised in that it also includes switch electricity
Road, one end of the on-off circuit are connected with the negative pole of calibrating terminal, and the other end is connected with ground terminal, and on-off circuit also includes a control
End processed, by the conducting and disconnection of the control end controlling switch circuit.
4. the test device of liquid crystal display LED-backlit according to claim 3, it is characterised in that the on-off circuit bag
Include audion Q5, audion Q6 and the second constant voltage source；Wherein, the colelctor electrode of the audion Q5 is connected with the negative pole of calibrating terminal
Connect, the emitter stage of audion Q5 is connected with ground terminal, the base stage of audion Q5 is connected with the emitter stage of audion Q6, audion Q6's
Base stage is connected with control end, and the colelctor electrode of audion Q6 is connected with the second constant voltage source.
5. the test device of liquid crystal display LED-backlit according to claim 3, it is characterised in that it also includes diode,
The Diode series are on the branch road that is connected with the base stage of audion Q2 of emitter stage of audion Q1.
6. the test device of liquid crystal display LED-backlit according to claim 3, it is characterised in that the audion Q1, three
The model of pole pipe Q2, audion Q3, audion Q4, audion Q5 and audion Q6 is C1815.
7. the test device of liquid crystal display LED-backlit according to claim 3, it is characterised in that it also includes capacitor,
The base stage of capacitor one end connecting triode Q1, one end is connected to ground terminal.
8. the test device of the liquid crystal display LED-backlit according to claim 1-7 any claim, it is characterised in that
The alarm is light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620920383.9U CN206024167U (en) | 2016-08-22 | 2016-08-22 | A kind of test device of liquid crystal display LED-backlit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620920383.9U CN206024167U (en) | 2016-08-22 | 2016-08-22 | A kind of test device of liquid crystal display LED-backlit |
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| Publication Number | Publication Date |
|---|---|
| CN206024167U true CN206024167U (en) | 2017-03-15 |
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| CN201620920383.9U Active CN206024167U (en) | 2016-08-22 | 2016-08-22 | A kind of test device of liquid crystal display LED-backlit |
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| Country | Link |
|---|---|
| CN (1) | CN206024167U (en) |
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- 2016-08-22 CN CN201620920383.9U patent/CN206024167U/en active Active
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