CN107037299B - Display screen start-up test circuit and device - Google Patents
Display screen start-up test circuit and device Download PDFInfo
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- CN107037299B CN107037299B CN201710476242.1A CN201710476242A CN107037299B CN 107037299 B CN107037299 B CN 107037299B CN 201710476242 A CN201710476242 A CN 201710476242A CN 107037299 B CN107037299 B CN 107037299B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/003—Environmental or reliability tests
Abstract
The invention is suitable for the electronic field, has provided a display screen start-up test circuit and apparatus, the circuit includes: the photosensitive detection unit is used for judging whether the display screen to be detected is normally started or not by detecting a white field signal displayed after the display screen is started, and correspondingly generating a photosensitive detection signal; the switching-on/off timing setting unit is used for setting the switching-on/off time and the switching-on/off frequency of the display screen to be tested and correspondingly generating a periodic pulse signal; a logic control unit for generating a logic control signal according to the periodic pulse signal and the photosensitive detection signal; the switch control unit outputs a switch control signal according to the logic control signal to control the start-up power supply controlled end of the display screen to be tested to start up. The invention automatically sets the on-off time and frequency of the display screen to be tested, the control unit controls the on-off of the power supply to carry out the power-on test, and can identify whether the display screen is normally started or not, and the abnormal site is reserved in the black screen state, so that the manual uninterrupted observation is not needed, and the manpower and material resources are greatly saved.
Description
Technical Field
The invention belongs to the field of electronics, and particularly relates to a display screen startup test circuit and a display screen startup test device.
Background
At present, the functionality of products is displayed by using a display screen as visual output by devices such as televisions, computers and handheld intelligent terminals, and in order to ensure the stability and reliability of the display screen in the use process, strict and massive on-off tests are required before leaving a factory, and the on-off tests are taken as an important index for considering the performance of the whole machine, and generally, the on-off tests are required to be performed for tens of thousands of times to detect whether the display screen has quality problems.
However, currently, the switching test of the display screen is generally performed manually, the test count is controlled manually, and when an abnormality of the display screen is detected, the manual control is suspended, and the detection maintenance is recorded and returned.
However, since the number of on-off tests is often tens of thousands, the use of manual control greatly wastes labor costs and also affects the test efficiency of mass products.
Disclosure of Invention
The embodiment of the invention aims to provide a display screen startup test circuit, which aims to solve the problems of labor cost waste and low batch test efficiency caused by the adoption of manual control of startup and shutdown tests of display screens before leaving factories at present.
The embodiment of the invention is realized in such a way that a display screen startup test circuit is connected with a startup power supply controlled end of a display screen to be tested, and the circuit comprises:
the photosensitive detection unit is used for judging whether the display screen to be detected is normally started or not by detecting a white field signal displayed after the display screen is started, and correspondingly generating a photosensitive detection signal;
the switching-on/off timing setting unit is used for setting the switching-on/off time and the switching-on/off frequency of the display screen to be detected and correspondingly generating a periodic pulse signal;
the logic control unit is used for generating a logic control signal according to the periodic pulse signal and the photosensitive detection signal, a first input end of the logic control unit is connected with an output end of the switching on/off timing setting unit, and a second output end of the logic control unit is connected with an output end of the photosensitive detection unit;
the switch control unit is used for outputting a switch control signal according to the logic control signal so as to control the start-up power supply controlled end of the display screen to be tested to start up, the input end of the switch control unit is connected with the output end of the logic control unit, and the output end of the switch control unit is connected with the start-up power supply controlled end of the display screen to be tested.
Another object of the embodiments of the present invention is to provide a display screen power-on test device including the above display screen power-on test circuit.
The embodiment of the invention sets the on-off time and the on-off frequency of the display screen to be tested through the on-off timing setting unit, further controls the on-off of the on-off power supply through the logic control unit and the on-off control unit to perform the on-off test, and recognizes whether the display screen is normally started or not through the photosensitive detection unit, so that the uninterrupted observation of manpower is not needed, and the circuit automatically controls to stop the on-off test so as to keep the display screen in a black screen state and keep the abnormal site, so that manpower and material resources are greatly saved as long as the whole machine cannot lighten the white screen.
Drawings
FIG. 1 is a block diagram of a display screen boot test circuit provided by an embodiment of the present invention;
fig. 2 is a circuit diagram of an example of a switching timing setting unit in a display screen start-up test circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The embodiment of the invention sets the on-off time and the on-off frequency of the display screen to be tested through the on-off timing setting unit, further controls the on-off of the on-off power supply through the logic control unit and the on-off control unit to perform the on-off test, and recognizes whether the display screen is normally started or not through the photosensitive detection unit, so that the uninterrupted observation of manpower is not needed, and the circuit automatically controls to stop the on-off test so as to keep the display screen in a black screen state and keep the abnormal site, so that manpower and material resources are greatly saved as long as the whole machine cannot lighten the white screen.
Fig. 1 shows a structure of a display screen power-on test circuit according to an embodiment of the present invention, and for convenience of explanation, only a portion relevant to the present invention is shown.
As an embodiment of the invention, the display screen startup test circuit is connected with a startup power supply controlled end of a display screen to be tested, and comprises:
the photosensitive detection unit 11 is used for judging whether the display screen to be detected is normally started or not by detecting a white field signal displayed after the display screen is started, and correspondingly generating a photosensitive detection signal;
preferably, the photosensitive detection unit 11 may be implemented using a photo-sensing sensor.
The on-off timing setting unit 12 is used for setting on-off time and on-off frequency of the display screen to be tested and correspondingly generating a periodic pulse signal;
the logic control unit 13 is used for generating a logic control signal according to the periodic pulse signal and the photosensitive detection signal, a first input end of the logic control unit 13 is connected with an output end of the switching on/off timing setting unit 12, and a second output end of the logic control unit 13 is connected with an output end of the photosensitive detection unit 11;
preferably, the logic control unit 13 may employ an and gate logic device, wherein a first input terminal of the and gate logic device is a first input terminal of the logic control unit 13, a second input terminal of the and gate logic device is a second input terminal of the logic control unit 13, and an output terminal of the and gate logic device is an output terminal of the logic control unit 13.
The switch control unit 14 is configured to output a switch control signal according to the logic control signal, so as to control the power-on power controlled end of the display screen to be tested to start, an input end of the switch control unit 14 is connected with an output end of the logic control unit 13, and an output end of the switch control unit 14 is connected with the power-on power controlled end of the display screen to be tested.
Preferably, the switch control unit 14 may be implemented using a relay.
Among the above units, the photosensitive detection unit 11, the on-off timing setting unit 12, and the on-off control unit 14 are all powered by a 12V dc voltage as a system power source, and the on-off power source uses a general 220V ac power.
In the embodiment of the invention, a reasonable power-on and power-off time is set for the controlled end of the power-on power supply through the power-on and power-off timing setting unit 12, so that the periodicity and consistency of the power-on and power-off of the whole machine are ensured.
After a switch control signal is sent out, the brightness on the display screen is sensed through the photosensitive detection unit 11, if the display screen is started normally, a white field is automatically displayed, at the moment, the photosensitive detection unit 11 can detect a white field signal, and then the display screen is judged to be started normally; if the display screen cannot be started normally, the display screen is black, at the moment, the photosensitive detection unit 11 cannot detect the white field signal, the display screen is judged to be started abnormally, an abnormal control signal is output, and the on-off test of the display screen to be detected is not continued.
In the embodiment of the invention, the periodic pulse signal and the photosensitive detection signal are logically judged to generate a logic control signal to control the actuation conduction period of the relay, so as to control the on-off of the 220V startup power supply.
Its logic judgment truth table is as follows.
When the periodic pulse signal outputted from the on/off timing setting unit 12 is set to a, the photosensitive detection signal generated by the photosensitive detection unit 11 is set to B, and the switching control signal outputted from the switching control unit 14 is set to C, then:
a has two states: 0 represents that the timer output is low, and 1 represents that the timer output is high;
b has two states: 0 represents that the feedback brightness of the display screen is low, the light sensing sensor cannot be conducted, 1 represents that the display screen displays a white field, and the display screen is started normally;
truth table listed above:
| A | B | C |
| 0 | 0 | 0 |
| 0 | 1 | 0 |
| 1 | 0 | 0 |
| 1 | 1 | 1 |
it can be seen that, when the periodic pulse signal is at a high level and the light sensing detection unit 11 detects a white field signal, the switch control unit 14 controls the power on to conduct the power on test.
The embodiment of the invention sets the on-off time and the on-off frequency of the display screen to be tested through the on-off timing setting unit, further controls the on-off of the on-off power supply through the logic control unit and the on-off control unit to perform the on-off test, and recognizes whether the display screen is normally started or not through the photosensitive detection unit, so that the uninterrupted observation of manpower is not needed, and the circuit automatically controls to stop the on-off test so as to keep the display screen in a black screen state and keep the abnormal site, so that manpower and material resources are greatly saved as long as the whole machine cannot lighten the white screen.
Fig. 2 shows an exemplary circuit of the on-off timing setting unit in the display screen on-test circuit according to the embodiment of the present invention, and for convenience of explanation, only a portion relevant to the present invention is shown.
As an embodiment of the present invention, the on-off timing setting unit 12 includes:
capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, capacitor C6, capacitor C7, resistor RA, resistor RB, and timer 121;
the 2 pin of the timer 121 is the frequency selection end of the switching-on/switching-off timing setting unit 12, the 6 pin of the timer 121 is connected with the 7 pin of the timer 121 through a resistor RB, the 7 pin of the timer 121 is connected with the 8 pin of the timer 121 through a resistor RA, the 8 pin and the 4 pin of the timer 121 are both connected with the positive pole of a system power supply, the 3 pin of the timer 121 is the output end of the switching-on/switching-off timing setting unit 12, the 1 pin of the timer 121 is grounded, the 5 pin of the timer 121 is grounded through a capacitor C7,
one end of the capacitor C1 to one end of the capacitor C6 are respectively a plurality of frequency sorting ends of the switching-on/off timing setting unit 12, and are selectively connected with a selection end of the switching-on/off timing setting unit 12.
Alternatively, timer 121 may employ a 555 timer or a 7555 timer.
The 555 timer is a medium-scale integrated device combining analog and digital functions, is commonly called 555 manufactured by a bipolar (TTL) process, is called 7555 manufactured by a Complementary Metal Oxide (CMOS) process, has a wide power supply voltage range and can work at 4.5V-16V, and comprises two voltage comparators, three equivalent series resistors, an RS trigger, a discharge tube T and a power output stage. It can provide two reference voltages VCC/3 and 2VCC/3.
Duty cycle algorithm d=ra/(ra+rb);
periodic algorithm t= (ra+rb) C1/1.43.
Preferably, the on-off timing setting unit 12 may further include:
a resistor RC and a light emitting diode LED1;
one end of the resistor RC is connected with the 3 pin of the timer 121, the other end of the resistor RC is connected with the anode of the light emitting diode LED1, and the cathode of the light emitting diode LED1 is grounded.
In the embodiment of the invention, the output state of the switch control signal can be prompted through the light emitting diode LED 1.
The embodiment of the invention sets the on-off time and the on-off frequency of the display screen to be tested through the on-off timing setting unit, further controls the on-off of the on-off power supply through the logic control unit and the on-off control unit to perform the on-off test, and recognizes whether the display screen is normally started or not through the photosensitive detection unit, so that the uninterrupted observation of manpower is not needed, and the circuit automatically controls to stop the on-off test so as to keep the display screen in a black screen state and keep the abnormal site, so that manpower and material resources are greatly saved as long as the whole machine cannot lighten the white screen.
Another object of the embodiments of the present invention is to provide a display screen power-on test device including the above display screen power-on test circuit.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (8)
1. A display screen start-up test circuit connected with a start-up power supply controlled end of a display screen to be tested, the circuit comprising:
the photosensitive detection unit is used for judging whether the display screen to be detected is normally started or not by detecting a white field signal displayed after the display screen is started, and correspondingly generating a photosensitive detection signal;
the switching-on/off timing setting unit is used for setting the switching-on/off time and the switching-on/off frequency of the display screen to be detected and correspondingly generating a periodic pulse signal;
the logic control unit is used for generating a logic control signal according to the periodic pulse signal and the photosensitive detection signal, a first input end of the logic control unit is connected with an output end of the switching on/off timing setting unit, and a second output end of the logic control unit is connected with an output end of the photosensitive detection unit;
the switch control unit is used for outputting a switch control signal according to the logic control signal so as to control the start-up power supply controlled end of the display screen to be tested to start up, the input end of the switch control unit is connected with the output end of the logic control unit, and the output end of the switch control unit is connected with the start-up power supply controlled end of the display screen to be tested;
the photosensitive detection unit, the switching-on and switching-off timing setting unit and the switching control unit are powered by direct-current voltage as a system power supply, and a starting power supply adopts general 220V alternating current.
2. The circuit of claim 1, wherein the photosensitive detection unit is a photo-sensor.
3. The circuit according to claim 1, wherein the switching on/off timing setting unit includes:
capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, capacitor C6, capacitor C7, resistor RA, resistor RB, and timer;
the 2 feet of the timer are the frequency selection end of the switching-on and switching-off timing setting unit and are connected with the 6 feet of the timer, the 6 feet of the timer are connected with the 7 feet of the timer through the resistor RB, the 7 feet of the timer are connected with the 8 feet of the timer through the resistor RA, the 8 feet and the 4 feet of the timer are both connected with the positive pole of a system power supply, the 3 feet of the timer are the output end of the switching-on and switching-off timing setting unit, the 1 feet of the timer are grounded, the 5 feet of the timer are grounded through the capacitor C7,
one end of the capacitor C1 to one end of the capacitor C6 are respectively a plurality of frequency sorting ends of the switching-on/off timing setting unit, and are selectively connected with a selection end of the switching-on/off timing setting unit.
4. A circuit as claimed in claim 3, wherein the timer is a 555 timer or a 7555 timer.
5. The circuit of claim 3, wherein the on-off timing setting unit further comprises:
a resistor RC and a light emitting diode LED1;
one end of the resistor RC is connected with the 3 pin of the timer, the other end of the resistor RC is connected with the anode of the light emitting diode LED1, and the cathode of the light emitting diode LED1 is grounded.
6. The circuit of claim 1, wherein the logic control unit is an and gate logic device, a first input of the and gate logic device is a first input of the logic control unit, a second input of the and gate logic device is a second input of the logic control unit, and an output of the and gate logic device is an output of the logic control unit.
7. The circuit of claim 1, wherein the switch control unit is a relay.
8. A display screen power-on test device, characterized in that the device comprises a display screen power-on test circuit according to any of claims 1 to 7.
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| CN201710476242.1A CN107037299B (en) | 2017-06-21 | 2017-06-21 | Display screen start-up test circuit and device |
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| CN201710476242.1A CN107037299B (en) | 2017-06-21 | 2017-06-21 | Display screen start-up test circuit and device |
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| CN107037299A CN107037299A (en) | 2017-08-11 |
| CN107037299B true CN107037299B (en) | 2023-05-16 |
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| CN107509073A (en) * | 2017-08-30 | 2017-12-22 | 四川长虹电器股份有限公司 | A kind of automated testing method of automatic decision start blank screen |
| CN111724722A (en) * | 2020-05-07 | 2020-09-29 | 安徽中科光电色选机械有限公司 | Display screen detection device for color sorter |
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