CN207067268U - A kind of display screen start test circuit and device - Google Patents
A kind of display screen start test circuit and device Download PDFInfo
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- CN207067268U CN207067268U CN201720728425.3U CN201720728425U CN207067268U CN 207067268 U CN207067268 U CN 207067268U CN 201720728425 U CN201720728425 U CN 201720728425U CN 207067268 U CN207067268 U CN 207067268U
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- display screen
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Abstract
The utility model is applied to electronic applications, there is provided a kind of display screen start test circuit and device, the circuit include：Photosensitive detection unit, by detect after display screen start the white field signal that shows judge display screen to be measured whether normal boot-strap, and corresponding generate photosensitive detection signal；Switching on and shutting down timing setting unit, set switching on and shutting down time and the switch unit frequency of display screen to be measured, and corresponding generation periodic pulse signal；Logic control element, logic control signal is generated according to periodic pulse signal and photosensitive detection signal；Switch control unit, according to logic control signal output switch control signal, to control the start power supply controlled end of display screen to be measured to start shooting.The utility model sets switching on and shutting down time and the frequency of display screen to be measured automatically, the break-make of control unit control start power supply boots up test, and can identify display screen whether normal boot-strap, retain in black state abnormal live, without artificial uninterrupted observation, manpower and materials are dramatically saves on.
Description
Technical field
The utility model belongs to electronic applications, more particularly to a kind of display screen start test circuit and device.
Background technology
The equipment such as TV, computer, hand-held intelligent terminal is all used as visual output to show product by display screen at present
Feature, and in order to ensure display screen stability in use and reliability, it is necessary to be carried out before dispatching from the factory strict, big
The switching on and shutting down test of amount, switching on and shutting down test usually require to open by tens thousand of secondary as an important indicator for considering overall performance
Test is closed, whether there is quality problems to detect display screen.
However, currently typically carrying out the switch testing of display screen by manually, tested and counted by manual control, and
When detecting display screen exception, manual control pause, record and retract Measuring error.
But because the number of switching on and shutting down test is typically up to ten thousand times, therefore manpower is greatly caused using manual control
The waste of cost, and also influence the testing efficiency of typical products in mass production.
Utility model content
The purpose of the utility model embodiment is to provide a kind of display screen start test circuit, it is intended to solves to use at present
Manual control display screen dispatch from the factory before switching on and shutting down test, cause human cost waste and batch testing efficiency it is low the problem of.
The utility model embodiment is achieved in that a kind of display screen start test circuit, with opening for display screen to be measured
Electromechanical source controlled end connects, and the circuit includes：
By detect after display screen start the white field signal that shows judge display screen to be measured whether normal boot-strap, and correspondingly
Generate the photosensitive detection unit of photosensitive detection signal；
Set switching on and shutting down time and the switch unit frequency of display screen to be measured, and the corresponding switching on and shutting down for generating periodic pulse signal
Timing setting unit；
The logic control element of logic control signal is generated according to the periodic pulse signal and the photosensitive detection signal,
The first input end of the logic control element is connected with the output end of the switching on and shutting down timing setting unit, the logic control
Second output end of unit is connected with the output end of the photosensitive detection unit；
According to the logic control signal output switch control signal, with control the start power supply of the display screen to be measured by
The switch control unit of end start is controlled, the output end of the input of the switch control unit and the logic control element connects
Connect, the output end of the switch control unit is connected with the start power supply controlled end of the display screen to be measured.
Further, the photosensitive detection unit is photoinduction sensor.
Further, the switching on and shutting down timing setting unit includes：
Electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7, resistance RA, resistance RB and fixed
When device；
2 pin of the timer select end and 6 pin of the timer for the frequency of the switching on and shutting down timing setting unit
Connection, 6 pin of the timer are connected by the resistance RB with 7 pin of the timer, and 7 pin of the timer pass through institute
State resistance RA to be connected with 8 pin of the timer, 8 pin and 4 pin of the timer are all connected with the positive pole of system power supply, described fixed
When device 3 pin be the switching on and shutting down timing setting unit output end, the timer 1 pin ground connection, 5 pin of the timer
It is grounded by the electric capacity C7,
The electric capacity C1 to the electric capacity C6 one end are respectively multiple frequencies point of the switching on and shutting down timing setting unit
End is selected, selectivity is connected with the selection end of the switching on and shutting down timing setting unit.
Further, the timer is 555 timers or 7555 timers.
Further, the switching on and shutting down timing setting unit also includes：
Resistance RC and LED 1；
One end of the resistance RC is connected with 3 pin of the timer, the other end of the resistance RC and described luminous two
Pole pipe LED1 anode connection, the minus earth of the LED 1.
Further, the logic control element is and gate logic device, first input with gate logic device
Hold as the first input end of the logic control element, described with the second input of gate logic device is the logic control list
Second input of member, the output end with the output end of gate logic device for the logic control element.
Further, the switch control unit is relay.
The another object of the utility model embodiment is, there is provided a kind of including the aobvious of above-mentioned display screen start test circuit
Display screen start test device.
The utility model embodiment set by switching on and shutting down timing setting unit display screen to be measured the switching on and shutting down time and
Unit frequency is switched, the break-make of start power supply is further controlled by logic control element and start control unit, boots up survey
Examination, and by photosensitive detection unit identify display screen whether normal boot-strap, without artificial uninterrupted observation, as long as complete machine
Can not brilliant white screen, the circuit automatically controls the test of shutdown switch machine, display screen is maintained at black state, it is abnormal it is live can also
Retain, so as to dramatically saves on manpower and materials.
Brief description of the drawings
Fig. 1 is the structure chart for the display screen start test circuit that the utility model embodiment provides；
Switching on and shutting down timing setting unit shows in the display screen start test circuit that Fig. 2 provides for the utility model embodiment
Example circuit diagram.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining
The utility model, it is not used to limit the utility model.In addition, institute in each embodiment of the utility model disclosed below
As long as the technical characteristic being related to does not form conflict each other, can is mutually combined.
The utility model embodiment set by switching on and shutting down timing setting unit display screen to be measured the switching on and shutting down time and
Unit frequency is switched, the break-make of start power supply is further controlled by logic control element and start control unit, boots up survey
Examination, and by photosensitive detection unit identify display screen whether normal boot-strap, without artificial uninterrupted observation, as long as complete machine
Can not brilliant white screen, the circuit automatically controls the test of shutdown switch machine, display screen is maintained at black state, it is abnormal it is live can also
Retain, so as to dramatically saves on manpower and materials.
Fig. 1 shows the structure for the display screen start test circuit that the utility model embodiment provides, for convenience of description,
It illustrate only the part related to the utility model.
As the embodiment of the utility model one, display screen start test circuit, with the start power supply of display screen to be measured by
End connection is controlled, including：
Photosensitive detection unit 11, for judging display screen to be measured by detecting the white field signal shown after display screen start
Whether normal boot-strap, and corresponding generate photosensitive detection signal；
Preferably, photosensitive detection unit 11 can use photoinduction sensor to realize.
Switching on and shutting down timing setting unit 12, for setting switching on and shutting down time and the switch unit frequency of display screen to be measured, and it is right
Periodic pulse signal should be generated；
Logic control element 13, for generating logic control signal according to periodic pulse signal and photosensitive detection signal, patrol
The first input end of volume control unit 13 is connected with the output end of switching on and shutting down timing setting unit 12, and the of logic control element 13
Two output ends are connected with the output end of photosensitive detection unit 11；
Preferably, logic control element 13 can use with gate logic device, should first input end with gate logic device
It is the second defeated of logic control element 13 with the second input of gate logic device for the first input end of logic control element 13
Enter end, the output end with gate logic device is the output end of logic control element 13.
Switch control unit 14, for according to logic control signal output switch control signal, to control display screen to be measured
The start of start power supply controlled end, the input of switch control unit 14 is connected with the output end of logic control element 13, switch
The output end of control unit 14 is connected with the start power supply controlled end of display screen to be measured.
Preferably, switch control unit 14 can use relay to realize.
In said units, photosensitive detection unit 11, switching on and shutting down timing setting unit 12 and switch control unit 14 by
12V DC voltage is powered as system power supply, and start power supply uses general 220V alternating currents.
In the utility model embodiment, by switching on and shutting down timing setting unit 12 come to start power supply controlled end setting one
The individual rational periodicity and uniformity for being powered and the powered-down time, ensureing complete machine start and close.
After switch controlling signal is sent, the brightness on display screen is sensed by photosensitive detection unit 11, if display
Shield normal boot-strap, show white field automatically, now, photosensitive detection unit 11 can detect white field signal, then judge that display screen is normal
Start；If display screen can not normal boot-strap, display screen is shown as black, and now, photosensitive detection unit 11 can't detect white field
Signal, then judge that exception, output abnormality control signal occurs in display screen start, and no longer the display screen to be measured is continued out
Shutdown test.
In the utility model embodiment, patrolled being generated after periodic pulse signal and photosensitive detection signal progress logic judgment
The adhesive turn-on cycle that control signal carrys out control relay is collected, and then controls the break-make of 220V start power supplys.
Its logic judgment truth table is as follows.
The periodic pulse signal that switching on and shutting down timing setting unit 12 exports is classified as A, the sense that photosensitive detection unit 11 generates
Light detecting signal is classified as B, and the switch controlling signal that switch control unit 14 exports is classified as C, then：
A has two states：0 represents timer output to be low, and 1 represents timer output as high level；
B has two states：0 to represent display screen feedback brightness relatively low, can not promote photoinduction sensor conducts, 1 represent it is aobvious
Display screen shows white field, normal boot-strap；
Truth table listed above：
| A | B | C |
| 0 | 0 | 0 |
| 0 | 1 | 0 |
| 1 | 0 | 0 |
| 1 | 1 | 1 |
As can be seen that be high level in periodic pulse signal, and when photosensitive detection unit 11 detects white field signal, open
The control start power supply conducting of control unit 14 is closed, boots up test.
The utility model embodiment set by switching on and shutting down timing setting unit display screen to be measured the switching on and shutting down time and
Unit frequency is switched, the break-make of start power supply is further controlled by logic control element and start control unit, boots up survey
Examination, and by photosensitive detection unit identify display screen whether normal boot-strap, without artificial uninterrupted observation, as long as complete machine
Can not brilliant white screen, the circuit automatically controls the test of shutdown switch machine, display screen is maintained at black state, it is abnormal it is live can also
Retain, so as to dramatically saves on manpower and materials.
Fig. 2 shows switching on and shutting down timing setting unit in the display screen start test circuit that the utility model embodiment provides
Exemplary circuit, for convenience of description, illustrate only the part related to the utility model.
As the embodiment of the utility model one, the switching on and shutting down timing setting unit 12 includes：
Electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7, resistance RA, resistance RB and fixed
When device 121；
2 pin of timer 121 select end to be connected with 6 pin of timer 121 for the frequency of switching on and shutting down timing setting unit 12,
6 pin of timer 121 are connected by resistance RB with 7 pin of timer 121, and 7 pin of timer 121 pass through resistance RA and timer
121 8 pin connection, 8 pin and 4 pin of timer 121 are all connected with the positive pole of system power supply, and 3 pin of timer 121 are determined for switching on and shutting down
When setup unit 12 output end, the 1 pin ground connection of timer 121,5 pin of timer 121 are grounded by electric capacity C7,
Electric capacity C1 to electric capacity C6 one end are respectively multiple frequencies sorting end of switching on and shutting down timing setting unit 12, selective
It is connected with the selection end of switching on and shutting down timing setting unit 12.
Alternatively, timer 121 can use 555 timers or 7555 timers.
555 timers are the medium-scale integration devices that a kind of analog- and digital- function phase combines, typically with ambipolar (TTL)
What technique made is referred to as 555, the power supply for being referred to as 7555, the 555 timers electricity made of CMOS (CMOS) technique
Press scope wide, can be worked in 4.5V~16V, its inside includes two voltage comparators, three equivalent series resistances, and a RS is touched
Send out device, a discharge tube T and power output stage.It can provide two reference voltage Vs CC/3 and 2VCC/3.
Dutycycle algorithm D=RA/ (RA+RB)；
Periodical algorithms T=(RA+RB) * C1/1.43.
Preferably, switching on and shutting down timing setting unit 12 can also include：
Resistance RC and LED 1；
Resistance RC one end is connected with 3 pin of timer 121, the resistance RC other end and the anode of LED 1
Connection, the minus earth of LED 1.
, can be by LED 1 come the output shape of prompt switch control signal in the utility model embodiment
State.
The utility model embodiment set by switching on and shutting down timing setting unit display screen to be measured the switching on and shutting down time and
Unit frequency is switched, the break-make of start power supply is further controlled by logic control element and start control unit, boots up survey
Examination, and by photosensitive detection unit identify display screen whether normal boot-strap, without artificial uninterrupted observation, as long as complete machine
Can not brilliant white screen, the circuit automatically controls the test of shutdown switch machine, display screen is maintained at black state, it is abnormal it is live can also
Retain, so as to dramatically saves on manpower and materials.
The another object of the utility model embodiment is, there is provided a kind of including the aobvious of above-mentioned display screen start test circuit
Display screen start test device.
Preferred embodiment of the present utility model is these are only, it is all in this practicality not to limit the utility model
All any modification, equivalent and improvement made within new spirit and principle etc., should be included in guarantor of the present utility model
Within the scope of shield.
Claims (8)
- The test circuit 1. a kind of display screen is started shooting, is connected, it is characterised in that described with the start power supply controlled end of display screen to be measured Circuit includes：By detect after display screen start the white field signal that shows judge display screen to be measured whether normal boot-strap, and corresponding generate The photosensitive detection unit of photosensitive detection signal；Set switching on and shutting down time and the switch unit frequency of display screen to be measured, and the corresponding switching on and shutting down timing for generating periodic pulse signal Setup unit；It is described according to the periodic pulse signal and the logic control element of the photosensitive detection signal generation logic control signal The first input end of logic control element is connected with the output end of the switching on and shutting down timing setting unit, the logic control element The second output end be connected with the output end of the photosensitive detection unit；According to the logic control signal output switch control signal, to control the start power supply controlled end of the display screen to be measured The switch control unit of start, the input of the switch control unit are connected with the output end of the logic control element, institute The output end of switch control unit is stated to be connected with the start power supply controlled end of the display screen to be measured.
- 2. circuit as claimed in claim 1, it is characterised in that the photosensitive detection unit is photoinduction sensor.
- 3. circuit as claimed in claim 1, it is characterised in that the switching on and shutting down timing setting unit includes：Electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7, resistance RA, resistance RB and timer；2 pin of the timer select end to be connected with 6 pin of the timer for the frequency of the switching on and shutting down timing setting unit, 6 pin of the timer are connected by the resistance RB with 7 pin of the timer, and 7 pin of the timer pass through the electricity Resistance RA is connected with 8 pin of the timer, and 8 pin and 4 pin of the timer are all connected with the positive pole of system power supply, the timer 3 pin be the switching on and shutting down timing setting unit output end, the 1 pin ground connection of the timer, 5 pin of the timer pass through The electric capacity C7 ground connection,The electric capacity C1 to the electric capacity C6 one end are respectively multiple frequencies sorting end of the switching on and shutting down timing setting unit, The selective selection end with the switching on and shutting down timing setting unit is connected.
- 4. circuit as claimed in claim 3, it is characterised in that the timer is 555 timers or 7555 timers.
- 5. circuit as claimed in claim 3, it is characterised in that the switching on and shutting down timing setting unit also includes：Resistance RC and LED 1；One end of the resistance RC is connected with 3 pin of the timer, the other end and the light emitting diode of the resistance RC LED1 anode connection, the minus earth of the LED 1.
- 6. circuit as claimed in claim 1, it is characterised in that the logic control element be with gate logic device, it is described with The first input end of gate logic device is the first input end of the logic control element, described second defeated with gate logic device Enter second input of the end for the logic control element, the described and output end of gate logic device is the logic control element Output end.
- 7. circuit as claimed in claim 1, it is characterised in that the switch control unit is relay.
- The test device 8. a kind of display screen is started shooting, it is characterised in that described device is included as described in any one of claim 1 to 7 Display screen start test circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720728425.3U CN207067268U (en) | 2017-06-21 | 2017-06-21 | A kind of display screen start test circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720728425.3U CN207067268U (en) | 2017-06-21 | 2017-06-21 | A kind of display screen start test circuit and device |
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| Publication Number | Publication Date |
|---|---|
| CN207067268U true CN207067268U (en) | 2018-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720728425.3U Active CN207067268U (en) | 2017-06-21 | 2017-06-21 | A kind of display screen start test circuit and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107037299A (en) * | 2017-06-21 | 2017-08-11 | 合肥惠科金扬科技有限公司 | A kind of display screen start test circuit and device |
-
2017
- 2017-06-21 CN CN201720728425.3U patent/CN207067268U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107037299A (en) * | 2017-06-21 | 2017-08-11 | 合肥惠科金扬科技有限公司 | A kind of display screen start test circuit and device |
| CN107037299B (en) * | 2017-06-21 | 2023-05-16 | 合肥惠科金扬科技有限公司 | Display screen start-up test circuit and device |
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