CN101470166B - Method and system for detecting control circuit with voltage regulation function - Google Patents
Method and system for detecting control circuit with voltage regulation function Download PDFInfo
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- CN101470166B CN101470166B CN200710306629.9A CN200710306629A CN101470166B CN 101470166 B CN101470166 B CN 101470166B CN 200710306629 A CN200710306629 A CN 200710306629A CN 101470166 B CN101470166 B CN 101470166B
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- control circuit
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Abstract
The invention relates to a system for detecting a brightness control circuit. The brightness control circuit is arranged in a display and provided with an adjustable resistance component and an output end, wherein the resistance value of the adjustable resistance component can be adjusted to change the output voltage of the output end, and the change of the output voltage induces the change of brightness corresponding to the image of the display. The system comprises a driving device for driving the adjustable resistance component to change resistance value; an A/D converter for sampling the output voltage of the brightness control circuit and converting the voltage value sampled in each time to relative digital signals; a computer connected with the A/D converter for receiving the digital signals; and a test program for receiving the digital signals transmitted from the A/D converter via the computer, judging if the changeable range delta V of the output voltage of the brightness control circuit meets standard according to the digital signals, and generating corresponding prompt information according to the judgment result.
Description
Technical field
The present invention is relevant with the technology of the control circuit that is used for detecting an electronic installation, relates in particular to the detection technique, the particularly detection of LCD brightness control circuit of the control circuit with adjustable resistance element.
Background technology
Based on the requirement on the quality, the internal control circuit of many electronic installations all needs by one or multinomial test event.At the intednsity circuit in the available liquid crystal display, need test usually when changing the output voltage of this intednsity circuit, whether can make the picture of this LCD the appreciable film flicker phenomenon of human eye occur.
There is an adjustable resistance element to dial commentaries on classics on this intednsity circuit for the user, the resistance value of this adjustable resistance element can transfer to change along with dialling of user, thereby change the output voltage of this intednsity circuit, make the picture shading value of this LCD do corresponding variation.
At this intednsity circuit is under the normal situation, and dialling the caused output voltage fluctuation of adjustable resistance element of changeing on it should be smooth-going curvilinear motion, so the picture of this LCD can be to get brighter or gradually dark smooth variation.Yet, when this intednsity circuit quality is bad, for example adjustable resistance element itself or deficient manufacturing procedure, then dialling changes the caused output voltage fluctuation of this adjustable resistance element, one or more drastic change will occur, this can impel this LCD to get brighter or the phenomenon of the film flicker (or beating) of gradually dark change procedure generation respective amount.
In order to detect this intednsity circuit in the process of adjusting its output voltage, the appreciable film flicker phenomenon of human eye appears in the picture that whether can cause this LCD, the finger that is personnel selection at present removes to dial the adjustable resistance element that changes on this intednsity circuit, then with the picture of this LCD of eye-observation, as long as observe the film flicker phenomenon, just this intednsity circuit is considered as defective products.
Yet this way is carried out with manual type fully, and trouble is bothersome and do not have very much efficient.Moreover everyone is also inconsistent for the impression of flicker, and some people can only experience bigger flicker and change, and some people then may experience less or trickleer flicker and change.Therefore, even this intednsity circuit, does not represent that it is exactly a non-defective unit by a certain tester's detection yet.This means the mode of this this intednsity circuit of manual detection, its so-called whether qualified definition does not have unified standard, causes the accuracy of its testing result lower.
Summary of the invention
The objective of the invention is to, a kind of method and system that is used to detect the control circuit with voltage regulation function is provided, so that unified standard is provided, in order to improve the degree of accuracy of testing result.
The invention provides a kind of method that is used to detect control circuit, this control circuit has an adjustable resistance element for adjusting its output voltage.This method comprises this adjustable resistance element of driving, to change its resistance value.During this adjustable resistance element is driven, the output voltage of this control circuit is taken a sample.Judge according to each sampling result whether the amplitude of fluctuation of the output voltage of this control circuit satisfies the criteria.Produce corresponding information according to comparison result.
The present invention also provides a kind of new detection system, is used to detect this control circuit.This control circuit has an adjustable resistance element for adjusting its output voltage.This system comprises a drive unit, connects this adjustable resistance element, and can drive this adjustable resistance element and change its resistance value.One A/D converter connects the output terminal of this control circuit, and with a sample rate, the output voltage of this control circuit is taken a sample, and converts each magnitude of voltage that is sampled to corresponding digital signal.One computer connects this A/D converter to receive those digital signals.And a test procedure is installed on this computer, and be configured to and receive the digital signal that this A/D converter transmits by this computer, judge the amplitude of fluctuation Δ V conformance with standard whether of the output voltage of this control circuit according to those digital signals, and produce corresponding information according to judged result.
The present invention also provides a kind of system of sensed luminance control circuit, this intednsity circuit is for being arranged in the display, and have an adjustable resistance element and an output terminal, the resistance value of adjusting this adjustable resistance element can change the output voltage on this output terminal, the change of this output voltage can make this display picture shading value take place change, this system comprises a drive unit, comprise a step motor and a train of reduction gears, this step motor connects this adjustable resistance element by this train of reduction gears, when this step motor is driven, can drives this adjustable resistance element and change its resistance value.One A/D converter connects the output terminal of this intednsity circuit, and with the sample rate of per second at least 90 times, the output voltage of this intednsity circuit is taken a sample, and the magnitude of voltage that will at every turn be sampled to converts corresponding digital signal to.One computer connects this A/D converter to receive those digital signals.One test procedure, be installed on this computer, and be configured to and receive the digital signal that this A/D converter transmits by this computer, judge the amplitude of fluctuation Δ V conformance with standard whether of the output voltage of this intednsity circuit according to those digital signals, and produce corresponding information according to judged result.
Technique effect of the present invention is, said method and system are specially adapted to the intednsity circuit in the detection LCD monitor, by sampling and analysis to the output voltage of this intednsity circuit, can check out whether this intednsity circuit has significantly change in the controlled process of its output voltage, if represent this LCD that the film flicker of generation phenomenon is arranged.Owing in testing process, do not need to connect this backlight liquid crystal display power supply changeover device, do not need this LCD yet, more do not need the people to remove to watch the picture of this LCD, so, quite save manpower and efficient.
Description of drawings
Fig. 1 is a system of the present invention preferred embodiment calcspar.
Fig. 2 is the test procedure process flow diagram of system of the present invention.
Fig. 3, Fig. 4 are respectively two kinds of testing result curve maps of system of the present invention.
Embodiment
For above-mentioned feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.
Fig. 1 is system of the present invention one a preferred embodiment calcspar, wherein this system connects an intednsity circuit 8, and the output terminal 80 of this intednsity circuit 8 is the backlight electric power change-over circuits 90 that are used for connecting a LCD, and this intednsity circuit 8 has an adjustable resistance element 81.This adjustable resistance element 81 has a knob (not shown), can adjust the resistance value of this adjustable resistance element 81 by rotating this knob.When the resistance value change of this adjustable resistance element 81, the output voltage V out of this intednsity circuit 8 is and then change also.The change of this output voltage V out can be controlled the work of this backlight electric power change-over circuit 90, thereby makes the picture of this LCD make corresponding shading value variation.
Adjusted by the people in the process of its resistance value at this adjustable resistance element 81, as long as this output voltage V out is corresponding smoothly change, then the variation of the picture shading value of this LCD also can be level and smooth, this picture of representing this LCD is in the process that changes, all be gradually bright or gradually dark, scintillation can not occur.Yet, if in the process of this output voltage V out earthquake, have unexpected change greatly or the situation that diminishes suddenly take place, just might cause the picture of this LCD to brighten normal subsequently suddenly, or deepening suddenly is normal subsequently, the scintillation of picture generation just.
Therefore, if detect that the output voltage V out of this intednsity circuit 8 becomes greatly suddenly or the amplitude of fluctuation Δ V that diminishes suddenly whether greater than a standard value, just can know the picture generation scintillation of this LCD by inference.According to inventor research, the preferable 0.1V that is about of this standard value, the amplitude of fluctuation Δ V that is to say this output voltage V out will cause the picture generation scintillation of this LCD during approximately greater than 0.1V.
In this example, this intednsity circuit 8 is objects to be measured, but this is just based on for the purpose of the convenient explanation, and in fact the present invention is applicable to that also detecting other has the control circuit of voltage regulation function, particularly has the control circuit of adjustable resistance element.Certainly, above-mentioned standard value also can be because of the difference of object to be measured difference to some extent.
As shown in Figure 1, system of the present invention comprises a drive unit 1, an A/D converter 2, a computer 3, reaches a test procedure 4.This drive unit 1 connects the adjustable resistance element 81 of this intednsity circuit 8, changes its resistance value in order to drive this adjustable resistance element 81.For example this drive unit 1 can select for use a step motor and a train of reduction gears to connect knob on this adjustable resistance element 81, so that the rotation of the knob of this step motor on can this adjustable resistance element 81 of transmission.Wherein the rotating speed of this step motor is preferably and is controlled at the identical or rotating speed when approaching this knob by human hand normal rotation of the rotating speed that makes its knob that drives.
This A/D converter 2 connects the output terminal 80 of these intednsity circuits 8, and with a sample rate, the output voltage V out of this intednsity circuit 8 is taken a sample, and the magnitude of voltage that will at every turn be sampled to sends this computer 3 to after converting corresponding digital signal to.These digital signals are quantized result of the magnitude of voltage that at every turn is sampled to, so each group digital signal is represented a kind of magnitude of voltage in fact.
This computer 3 can be selected general PC for use, and this computer 3 is by its linkage interface, and for example the LPT linkage interface is connected respectively with this drive unit 1 and A/D converter 2.
This test procedure 4 is installed on this computer 3, and is configured to pass through the step that this computer 3 is realized as shown in Figure 2:
A) receive the digital signal that this A/D converter 2 transmits;
B) judge the amplitude of fluctuation Δ V conformance with standard whether of the output voltage V out of this intednsity circuit 8 according to those digital signals; And
C) produce corresponding information according to judged result.The display of this computer 3 is shown represents the Word message of acceptance or rejection, or make this computer 3 send the acoustic information of representing acceptance or rejection, or aforementioned both have it concurrently.
(Central Research Institute of Electric Power Industry points out in the research report of being delivered that CRIEPI) human eyes have different susceptibilitys to the change frequency of beam lighting in Japanese central power research institute.Human eyes can be felt to the light between frequency 1～30Hz, are that the light of 10Hz more can be discovered easily to frequency especially, and the light that frequency exceeds 30Hz or is lower than 1Hz is not then felt.Therefore, the sample rate of the output voltage V out of 2 pairs of these intednsity circuits 8 of this A/D converter preferably is not less than per second 30 times, is preferably per second sampling 40 times.In fact, the sampling number of times of this A/D converter 2 the more, the output voltage V out that reflects also more accurately, but number of times can influence arithmetic speed too much, so, should look the practice occasion and decide.Be that per second will be taken a sample 90 times at least in this example, be preferably per second sampling 120 times.This represents that these A/D converter 2 per seconds can transmit 120 groups of digital signals and give this computer 3, the corresponding respectively magnitude of voltage representing this output voltage V out of each group digital signal.
In this b step, for the amplitude of fluctuation Δ V that more correctly judges this output voltage V out conformance with standard whether, be preferably the digital signal that this A/D converter 2 is sent to this computer 3, magnitude of voltage V1 with continuous 3 groups of digital signal representatives, V2, V3 is to analyse and compare in a unit ground, as long as the difference of the difference of V1 and V2 or V2 and V3 is wherein one greater than a standard value, 0.1V for example, the amplitude of fluctuation Δ V that just judges this output voltage V out is not inconsistent standard, then, make as the c step to show the underproof information of representative on the display of this computer 3, this means that this intednsity circuit 8 is defective productss.
The curve map of Fig. 3, Fig. 4 is to be used for illustrating that the adjustable resistance element 81 of this drive unit 1 this intednsity circuit 8 of driving changes in the process of its resistance values the change of the correspondence of the output voltage V out of this intednsity circuit 8.Wherein, the testing result of the qualified intednsity circuit 8 of curve display of Fig. 3, the curve of Fig. 4 then shows the testing result of a underproof intednsity circuit 8.
In Fig. 3, the magnitude of voltage of this output voltage V out is to increase gradually along with time T, and this expression this drive unit 1 during this period is that forward ground drives this adjustable resistance element 81, and promptly the resistance value of this adjustable resistance element 81 is to change from 0 towards maximal value.After crossing over a point, the resistance value of this adjustable resistance element 81 is to change towards 0 from maximal value.This output voltage V out is in maximal value and makes curve straight top occur among the figure, and this is that the characteristic of this adjustable resistance element 81 makes so.
In the curve of Fig. 3, this output voltage V out changes smooth-goingly, the situation of violent change of moment do not occur.This points out that detected intednsity circuit 8 is qualified non-defective units at present.
With respect to Fig. 3, the curve among Fig. 4 obviously is to occur more and bigger precipitous variation, and wherein in X1 and X2 indication part, the amplitude of fluctuation of this output voltage V out is greatly to exceeding predetermined standard value.This points out that detected intednsity circuit 8 is underproof defective productss at present.
From above-mentioned explanation as can be known, whether system of the present invention can cause in the process of this LCD generation film flicker phenomenon at this intednsity circuit 8 of detection, be to carry out automatically by this computer 3 to detect, do not need this backlight electric power change-over circuit 90 of actual connection, do not need to connect this LCD yet, more do not need personnel to remove to watch the picture of this LCD.Therefore, quite save manpower and efficient.
Moreover the standard of detection is based upon in this computer 3 in advance, and all testing results are all come according to same standard, and the situation that does not vary with each individual is so the accuracy of testing result is higher relatively.
In addition, this test procedure 4 can further be configured to receive and to change some parameter values, and impels the running of these computer 3 these drive units 1 of control and this A/D converter 2 according to those parameter values.For example the rotating speed of step motor, rotate the number of turns, and sample rate of A/D converter 2 or the like.
Claims (7)
1. a method that is used to detect the control circuit with voltage regulation function is characterized in that, this control circuit has an adjustable resistance element for adjusting its output voltage, and this method comprises:
Drive this adjustable resistance element, to change its resistance value;
During this adjustable resistance element is driven,, the output voltage of this control circuit is taken a sample with the sample rate of per second at least 90 times;
Judge according to each sampling result whether the amplitude of fluctuation of the output voltage of this control circuit satisfies the criteria; And
Produce corresponding information according to comparison result, judge wherein whether standardized step comprises for the amplitude of fluctuation of output voltage of this control circuit:
With continuous 3 times sampling result magnitude of voltage V1, V2, the V3 of correspondence representative be to analyse and compare in a unit ground;
Calculate V1 and the difference of V2 and the difference of V2 and V3;
The difference of V1 and V2 and the difference of V2 and V3 are made comparisons with a standard value respectively; And
Wherein one during, produce the underproof information of representative in the difference of the difference of V1 and V2 and V2 and V3 greater than this standard value.
2. system that is used to detect control circuit with voltage regulation function, it is characterized in that, this control circuit has an adjustable resistance element and an output terminal, and the resistance value of adjusting this adjustable resistance element can change the output voltage on this output terminal, and this system comprises:
One drive unit comprises a step motor and a train of reduction gears, and this step motor connects this adjustable resistance element by this train of reduction gears, when this step motor is driven, can drives this adjustable resistance element and change its resistance value;
One A/D converter connects the output terminal of this control circuit, and with the sample rate of per second at least 90 times, the output voltage of this control circuit is taken a sample, and convert each magnitude of voltage that is sampled to corresponding digital signal;
One computer connects this A/D converter to receive those digital signals; And
One test procedure, be installed on this computer, and be configured to and receive the digital signal that this A/D converter transmits by this computer, judge the amplitude of fluctuation Δ V conformance with standard whether of the output voltage of this control circuit according to those digital signals, and produce corresponding information according to judged result
Wherein this computer connects this drive unit, this test procedure be further configured can receive some be used for the control step motor rotating speed, rotate the number of turns, and the parameter of the sample rate of A/D converter, and control the running of this drive unit and A/D converter according to those parameters.
3. the system that is used to detect control circuit as claimed in claim 2 with voltage regulation function, it is characterized in that, wherein this test procedure is further configured and can receives the sample rate that some are used for controlling this A/D converter running, and controls the running of this A/D converter according to this sample rate.
4. system that is used for the sensed luminance control circuit, it is characterized in that, this intednsity circuit is for being arranged in the display, and have an adjustable resistance element and an output terminal, the resistance value of adjusting this adjustable resistance element can change the output voltage on this output terminal, the change of this output voltage can make this display picture shading value take place change, and this system comprises:
One drive unit comprises a step motor and a train of reduction gears, and this step motor connects this adjustable resistance element by this train of reduction gears, when this step motor is driven, can drives this adjustable resistance element and change its resistance value;
One A/D converter connects the output terminal of this intednsity circuit, and with the sample rate of per second at least 90 times, the output voltage of this intednsity circuit is taken a sample, and the magnitude of voltage that will at every turn be sampled to converts corresponding digital signal to;
One computer connects this A/D converter to receive those digital signals; And
One test procedure, be installed on this computer, and be configured to and receive the digital signal that this A/D converter transmits by this computer, judge the amplitude of fluctuation Δ V conformance with standard whether of the output voltage of this intednsity circuit according to those digital signals, and produce corresponding information according to judged result.
5. the system that is used for the sensed luminance control circuit as claimed in claim 4 is characterized in that, wherein this test procedure is judged the amplitude of fluctuation Δ V conformance with standard whether of the output voltage of this intednsity circuit according to later step, and those steps comprise:
With continuous 3 groups of digital signals magnitude of voltage V1, V2, the V3 of correspondence representative be to analyse and compare in a unit ground;
Calculate V1 and the difference of V2 and the difference of V2 and V3;
The difference of V1 and V2 and the difference of V2 and V3 are made comparisons with a standard value respectively; And
Wherein one during, produce the underproof information of representative in the difference of the difference of V1 and V2 and V2 and V3 greater than this standard value.
6. the system that is used for the sensed luminance control circuit as claimed in claim 5 is characterized in that, wherein this standard value is 0.1V.
7. the system that is used for the sensed luminance control circuit as claimed in claim 6 is characterized in that, wherein the speed that the output voltage of this intednsity circuit is taken a sample is per second sampling 120 times.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW096150344A TWI367337B (en) | 2007-12-26 | 2007-12-26 | System and method for testing a voltage adjustment circuit |
| CN200710306629.9A CN101470166B (en) | 2007-12-26 | 2007-12-28 | Method and system for detecting control circuit with voltage regulation function |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW096150344A TWI367337B (en) | 2007-12-26 | 2007-12-26 | System and method for testing a voltage adjustment circuit |
| CN200710306629.9A CN101470166B (en) | 2007-12-26 | 2007-12-28 | Method and system for detecting control circuit with voltage regulation function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101470166A CN101470166A (en) | 2009-07-01 |
| CN101470166B true CN101470166B (en) | 2011-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710306629.9A Expired - Fee Related CN101470166B (en) | 2007-12-26 | 2007-12-28 | Method and system for detecting control circuit with voltage regulation function |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101470166B (en) |
| TW (1) | TWI367337B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101950516B (en) * | 2010-09-08 | 2012-12-05 | 佛山市进步科技有限公司 | Detection system of driving plates liquid crystal television and liquid crystal display |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1218182A (en) * | 1997-10-29 | 1999-06-02 | 松下电器产业株式会社 | Apparatus and methods for testing variable resistors |
| US5933130A (en) * | 1996-07-26 | 1999-08-03 | Wagner; Roger | Anti-eye strain apparatus and method |
| CN1967644A (en) * | 2005-11-18 | 2007-05-23 | 南京Lg同创彩色显示***有限责任公司 | Flat video display capable of adjusting brightness |
| CN1319421C (en) * | 2002-06-26 | 2007-05-30 | 明基电通股份有限公司 | Detection and regulation method for LCD brightness |
-
2007
- 2007-12-26 TW TW096150344A patent/TWI367337B/en not_active IP Right Cessation
- 2007-12-28 CN CN200710306629.9A patent/CN101470166B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5933130A (en) * | 1996-07-26 | 1999-08-03 | Wagner; Roger | Anti-eye strain apparatus and method |
| CN1218182A (en) * | 1997-10-29 | 1999-06-02 | 松下电器产业株式会社 | Apparatus and methods for testing variable resistors |
| CN1319421C (en) * | 2002-06-26 | 2007-05-30 | 明基电通股份有限公司 | Detection and regulation method for LCD brightness |
| CN1967644A (en) * | 2005-11-18 | 2007-05-23 | 南京Lg同创彩色显示***有限责任公司 | Flat video display capable of adjusting brightness |
Non-Patent Citations (3)
| Title |
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| JP特开2002-148618A 2002.05.22 |
| JP特开2007-163398A 2007.06.28 |
| 白德鹏等."红外遥控输出可调的稳压电源".《实验科学与技术》.2006,(第6期),7-9,24. |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI367337B (en) | 2012-07-01 |
| CN101470166A (en) | 2009-07-01 |
| TW200928398A (en) | 2009-07-01 |
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