CN100401042C - Methos and system for detecting faceplate of liquid crystal display - Google Patents

Methos and system for detecting faceplate of liquid crystal display Download PDF

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Publication number
CN100401042C
CN100401042C CNB031034020A CN03103402A CN100401042C CN 100401042 C CN100401042 C CN 100401042C CN B031034020 A CNB031034020 A CN B031034020A CN 03103402 A CN03103402 A CN 03103402A CN 100401042 C CN100401042 C CN 100401042C
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China
Prior art keywords
display panels
shade
detection
gray
flicker degree
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Expired - Fee Related
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CNB031034020A
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Chinese (zh)
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CN1519560A (en
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汪光夏
苏家禾
萧武域
陈振庆
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MUDE SCI-TECH Co Ltd
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MUDE SCI-TECH Co Ltd
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Abstract

The present invention discloses a method and a system for detecting a liquid crystal display panel. The present invention obtains the variation curves of the gray scale degrees of a plurality of image pictures of the liquid crystal display panel by optical image sampling, and the flicker degree of the image pictures can be determined by the vibration amplitude and the central value of the variation curves of the gray scale degrees. The present invention can adjust the electric potential of a drive circuit of the liquid crystal display panel according to the obtained value of the flicker degree so as to eliminate the flicker phenomenon which can be perceived by people's eyes.

Description

The detection method of display panels and system thereof
Technical field
The invention relates to a kind of detection method and system thereof of display panels, particularly detect the detection method and the system thereof of the flicker level of display panels about a kind of applied for machines vision.
Background technology
Scintillation is the key factor that influences display quality in the LCD, and itself and human eye sensitivity have direct relation.Thin film transistor (TFT) (TFT) and super (STN) LCD of reversing are the displays that is widely used most at present, yet the both has the phenomenon of flicker.Generally speaking, display drive signal need apply an AC field within a certain period of time and drives it and carry out reversal of poles.But in general twisting liquid crystal, because the ionic charge effect is easier to produce scintillation, though therefore improve the degree that the frequency of extra electric field can reduce flicker, the electric field frequency that adds is high more, and its power consumption also can be big more.And thin film transistor (TFT) has caused the degree displacement of signal voltage owing to the stray capacitance cause, so the signal magnitude difference of positive-negative half-cycle, so its scintillation is even more serious.
The display panels supplier proposes the driving method of four kinds of reversal of poles at present, but when presenting the fc-specific test FC pattern, still can produce the existing picture of flicker, for example the driving method of counter-rotating (dot inversion) has the point of scintillation generation when presenting the test pattern of the following pixel (sub-pixe1) design, and the driving method of row counter-rotatings (line inversion) has the defective of flicker easily when presenting horizontal test pattern, in other words, these four kinds of driving methods all can also easily be inspected same problem by the user of vision sensitivity certainly because of running into the problem that certain class testing pattern exposes flicker when viewing and admiring.
Need to inspect through QC personnel the display quality of every panel before the display panels shipment, and the display effect of every panel is adjusted to unanimity as far as possible, wherein flicker level is an important fault detection.Yet everyone is because of the difference of vision, diagnostic ability for scintillation is also different, the serious deviation that so will cause product examine to carry out, recurrent be display panels by product examine after shipment to client, but checked out defective products and returned goods, thereby cause company reputation and pecuniary loss by the client of vision sensitivity.
In sum, press for a kind of standardization and automated method on the market and solve the problems referred to above.
Summary of the invention
Fundamental purpose of the present invention provides the detection method and the system thereof of display panels, and the detection mode that the best can be provided is to detect the flicker level of display panels picture, and can replace artificial fully is the detection operating type of foundation with naked eyes.
Second purpose of the present invention provides a kind of method of adjusting the driving circuit of display panels, and it is minimum that the flicker level of every panel picture is adjusted to, and have good consistance.
For achieving the above object, the invention provides a kind of detection method and system thereof of display panels, it is the shade of gray change curve by several image frames of optical image-taking acquisition display panels, the flicker degree that can determine this image frame by the amplitude and the central value of this shade of gray change curve.A user or an automatic regulating apparatus can be adjusted the driving voltage of display panels according to the numerical value of resulting flicker degree, thereby reduce the amplitude of shade of gray change curve, can make flicker number of degrees value become big simultaneously.Detect so repeatedly and the feedback adjustment, flicker level is reduced to minimum, that is, making flicker number of degrees value is maximal value, finally eliminates the scintillation that human eye can be discovered.
According to an aspect of the present invention, provide a kind of detection method of display panels, comprised the following step: a display panels is provided; Drive this display panels to show a test pattern picture; The mode of setting this picture sampling and measuring; Write down the picture of this display panels in the mode of optical image-taking; The shade of gray of analyzing this sampling picture changes; Reach by the amplitude of this shade of gray variation and the ratio of central value and whether surpass a predetermined threshold value with the flicker degree of judging this pixels sampled.
According to a further aspect in the invention, provide a kind of detection system of display panels, comprised: a display panels, be used to show a test pattern picture, the display panels of going back has a knob of adjusting driving voltage in addition; One optical image-taking device is used to capture described test pattern picture; And a controller, be used to calculate the shade of gray variation of picture that described optical image-taking device captures and produce a main flicker degree, and judge whether this flicker degree surpasses a predetermined threshold value.
Description of drawings
The present invention will illustrate according to accompanying drawing, wherein:
Fig. 1 is the synoptic diagram of the detection system of display panels of the present invention.
Fig. 2 is the shade of gray change curve that pick-up unit of the present invention is measured pixel;
Fig. 3 is the process flow diagram of the detection method of display panels of the present invention.
Fig. 4 is the picture sampling mode of the measurement shade of gray of display panels of the present invention, and
Fig. 5 (a) is the synoptic diagram of preferred embodiment of the test fixture of display panels of the present invention to (d).
Symbol description among the figure:
The detection system of 10 display panels
11,11a, 11b, 11 ' optical image-taking device
12 controllers
14 test pattern generators
51,51 ' fixed mount
52,52 ' panel worktable
53 slew gears
57 hand-operated tools
60,60 ' display panels
64,64 ' knob
70 operators
80 self-turning mechanisms
Embodiment
Fig. 1 is the synoptic diagram of display panels detection system of the present invention, it is provided with an optical image-taking device 11 above display panels 60, general CCD or the CMOS video camera of using more, can be divided into matrix type or single line style on such video camera specification again, also can divide into two kinds of mode signal outputs of analog or digital.Utilize test pattern generator 14 to produce specific test pattern, make display panels 60 show this test pattern picture (frame), this test pattern generator 14 can be online or not online with controller 12, the optical image-taking device 11 that is fixed on the top simultaneously can be along with the picture of continuous this display panels 60 of acquisition of time, to deliver to the variation that controller 12 (combination of for example general computing machine and capturing images card) calculates its shade of gray, and note with curve form.
Above-described detection system 10 is measured the sampling picture, observed its shade of gray is changed being depicted as curve map, as shown in Figure 2.Horizontal ordinate is a time shaft among the figure, and ordinate is the intensity gray scale degree after the 11 gained image digitazations of optical image-taking device.Clearly, the shade of gray of this sampling picture is not a certain value, is to make shade of gray up and down with the curve of near sinusoidal function or triangular waveform to change.Represent the wherein shade of gray of primary sample picture at every on the curve, wherein La and Lb can be considered as the generalized mean amplitude of this curve and average amplitude up and down respectively and Lc generally has two kinds of definition, a kind of is the mean value of shade of gray, same waveform as about this moment is only complete, otherwise La ≠ Lb/2; Another kind of Lc is a mean value of representing crest a ' and trough b ' value, at this moment La=Lb/2.By this brightness change curve similarly formula of degree of being glimmered (), formula (two), formula (three), formula (four), formula (five) or formula (six)>as follows:
FL=K/Lb+M ... formula (one)
FL=K/La+M ... formula (two)
FL=KlogLc/La+M ... formula (three)
FL=KlogLc/Lb+M ... formula (four)
FL=KlogLc/ (Lb/2)+M ... formula (five)
FL=KlogLc/ (Lb-La)+M ... formula (five)
Wherein K and M are coefficient, and default value is respectively 20 and 0, and this K and M value are to use as proofreading and correct the post-simulation compensation.Amplitude La or Lb are bigger, and the situation of expression flicker is more serious, so the FL value can be littler.Otherwise it is littler to work as amplitude La or Lb, and expression flicker situation is preferable, and the FL value can be bigger.Certainly except these six formula, be all spiritual place of the present invention as if the flicker kilsyth basalt being shown the relational expression of Lc with respect to the ratio of La or Lb, be not limited to the relational expression of representing with logarithm or natural logarithm.
The present invention can utilize the foundation of the numerical value of this flicker degree as the driving circuit of adjusting display panels 60, rather than the bigger human eye of main otherness goes to observe and finish adjustment.
Fig. 3 is the detection method process flow diagram of display panels of the present invention, according to step 30, sets test pattern by the test pattern generator.Step 31 shows this test pattern by display panels, and generally this test pattern is to design according to the type of drive of display panels, its objective is its picture that detects shortcoming of the easiest exposure is presented.In step 32; when display panels presents this resolution chart; image-taking device can carry out the optical image-taking of this display frame along with the time; usually can serial sampling work as display panels according to each pixel display level of test pattern order, and image-taking device will carry out the optical image-taking of this display surface face along with the time above the sample number of a complete cycle of curve.In step 33, by the data of step 32 capture, the shade of gray of measuring sampling picture in the picture changes.In step 34, shade of gray change curve by pixels sampled can obtain three numerical value such as Lc, La and Lb, with these two numerical value substitution formula (one), formula (two), formula (three), formula (four), formula (five) or formula (six), just can determine the numerical value of its flicker degree, the selection of above-mentioned formula can be decided by the user, so far having finished the measurement of the scintillation of display panels, next is the action of adjusting.
According to the numerical value of this flicker degree and judge whether it is maximal value, shown in step 35,, therefore need to adjust relevant driving circuit, shown in step 36 if not maximal value represents not reach the optimum condition of this display panels.General display panels provides the knob of adjusting common voltage more, when this common voltage is adjusted to optimal numerical value, will make the angle variation of liquid crystal rotation dwindle when the polarity of pixel is switched as far as possible, and so the amplitude of variation of shade of gray also will reach and minimize.Then in the round-robin mode, turn back to step 32 and carry out optical image-taking again after the adjustment.Otherwise,, judge whether that this flicker degree reaches default threshold value if the judgement of step 35 will carry out step 37 for being.If meeting this threshold value represents that then this display panels adjusted is certified products, on the contrary, represent that then it still is defective products that this display panels had both made through adjusting.
Fig. 4 is the picture sampling mode of the measurement shade of gray of display panels of the present invention.The picture 61 of whole liquid crystal display panel can horizontal or vertically be divided into several zones, and the number of regions minimum is 1, is as the different range of measuring the flicker degree.With Fig. 4 is example, is picture 61 is divided four vertical measured zone 611~614, is then captured images and is delivered to controller 12 by optical image-taking device 11.According to the measured zone that sets, have two kinds on the way of curve finishing: first kind is to measure the shade of gray of these all pixels of zone and calculate its mean value, makes a shade of gray change curve.Second kind is that pixel on extracting several or sweep trace 62 is a measurement target.Can try to achieve the value of La, Lb and Lc in the different measuring zone 611~614 respectively, and determine the flicker number of degrees value of its each measured zone by formula ()~formula (six).Since the circuit arrangement of display panels, the flicker degree of measured zone 611~614 and inconsistent on the picture 61.Determine the flicker quality and the grade of panel 60, generally can set the threshold value of a flicker degree, the tolerance of this threshold value decision panel flash also can be set several flicker degree certainly to judge the quality of grade.When number of regions greater than 1 the time, then have indivedual flicker degree values in every zone.At this moment, can utilize average each area flicker degree value, minimum area flicker degree value or alternate manner for judgement.
Because the display panels 60 of each manufacturer differs for knob 64 positions of adjusting common voltages, have plenty of with the panel picture in the same side as Fig. 5 (a); And also have with the panel picture at homonymy not, as the display panels 60 ' of Fig. 5 (b).All be applicable to the display panels 60 and 60 ' of these two kinds of patterns for the detection system that can make display panels, need to adopt two cover optical image-taking device 11a and 11b, be erected on the fixed mount 51 in one on the other mode, and lay respectively at the both sides of panel worktable 52.The middle body of this panel worktable 52 has an opening, but the demonstration placed face down of fluid,matching LCD panel 60 ', and by the optical image-taking device 11b of below acquisition picture.Certainly, operator 70 still can hold hand-operated tools 57 by top turning knob 64 ', the scintillation of picture is adjusted to the slightest, considers that so the test fixture of ergonomic can improve operator 70 work efficiency.
Another kind of test fixture is then only used one group of optical image-taking device 11 ', and is aided with a fixed mount 51 ' that can turn round 180 °, and this kind mode is as shown in Fig. 5 (c) and 5 (d).This fixed mount 51 ' is in fixed optics image-taking device 11 ', and combines with the panel worktable 52 ' of this display panels 60 of clamping or 60 '.Rotation mechanism 53 these fixed mounts 51 ' of control carry out 180 ° of rotating motions once in addition, and this slew gear 53 can use general revolution cylinder, or actuator and through-drive combination of elements part.
When the knob 64 of adjusting common voltage during in the same side, can make the display surface of display panels 60 be placed on drawing board worktable 52 ' up, with display surface shown in Fig. 5 (c).This moment, operator 70 can hold hand-operated tools 57 from top turning knob 64, or utilized a self-turning mechanism 80 to carry out the work of adjusting, and reduced to the scintillation of picture the slightest.Just when the numerical value of flicker degree reaches maximal value, the action of knob 64 just stops operating, yet shown in Fig. 5 (d), when the knob 64 ' of adjusting common voltage and display surface not in the same side, and the demonstration of display panels 60 ' and being placed on down on the panel worktable 52 ', this moment can be by slew gear 53 with 180 ° of fixed mount 51 ' revolutions, therefore optical image-taking device 11 ' can forward the below of display panels 60 ' to, and operator 70 or self-turning mechanism 80 promptly can be at identical position turning knobs 64 '.Certainly, can knob 64 ' be gone to best position by system's feedback signal order self-turning mechanism 80.
Technology contents of the present invention and technical characterstic disclose as above, yet those skilled in the art still may be based on teaching of the present invention and announcements and done all replacement and modifications that does not deviate from spirit of the present invention.Therefore.Protection scope of the present invention should be not limited to that embodiment discloses, and should comprise various do not deviate from replacement of the present invention and modifications, and is contained by claims of the application.

Claims (26)

1. the detection method of a display panels comprises the following step:
One display panels is provided;
Drive this display panels to show a test pattern picture;
The mode of setting this picture sampling and measuring;
Write down the picture of this display panels in the mode of optical image-taking;
The shade of gray of analyzing this sampling picture changes; And
Whether surpass a predetermined threshold value by the amplitude of this shade of gray variation and the ratio of central value with the flicker degree of judging this pixels sampled.
2. the detection method of display panels according to claim 1 is characterized in that described optical image-taking mode is to use a CCD camera, CMOS video camera, single line style video camera or matrix type video camera.
3. the detection method of display panels according to claim 1 is characterized in that described test pattern is produced by a test pattern generator, presents this test pattern picture by a display driver interface to drive described display panels again.
4. the detection method of display panels according to claim 1 is characterized in that described flicker degree FL is determined by formula F L=K/Lb+M, the average amplitude up and down that on behalf of described shade of gray, Lb change, and K and M are coefficient.
5. the detection method of display panels according to claim 1 is characterized in that described flicker degree FL is determined by formula F L=K/La+M, the average amplitude that on behalf of described shade of gray, La change, and K and M are coefficient.
6. the detection method of display panels according to claim 1, it is characterized in that described flicker degree FL is determined by formula F L=KlogLc/La+M, Lc represents the central value of described shade of gray variation or the mean value of crest and trough, the average amplitude that on behalf of this shade of gray, La change, K and M are coefficient.
7. the detection method of display panels according to claim 1, it is characterized in that described flicker degree FL is determined by formula F L=KlogLc/Lb+M, Lc represents the central value of described shade of gray variation or the mean value of crest and trough, the average amplitude up and down that on behalf of described shade of gray, Lb change, K and M are coefficient.
8. the detection method of display panels according to claim 1, it is characterized in that described flicker degree FL is determined by formula F L=KlogLc/ (Lb/2)+M, Lc represents the central value of described shade of gray variation or the mean value of crest and trough, the average amplitude up and down that on behalf of described shade of gray, Lb change, K and M are coefficient.
9. the detection method of display panels according to claim 1, it is characterized in that described flicker degree FL is determined by formula F L=KlogLc/ (Lb-La)+M, Lc represents the central value of described shade of gray variation or the mean value of crest and trough, the average amplitude that on behalf of described shade of gray, La change, the average amplitude up and down that on behalf of described shade of gray, Lb change, K and M are coefficient.
10. the detection method of display panels according to claim 1 is characterized in that it comprises the driving voltage of the described display panels of an adjustment in addition, makes described flicker degree be higher than the step of described threshold value.
11. the detection method of display panels according to claim 1 is characterized in that it comprises the following step in addition:
Judge whether described flicker degree reaches maximal value; And
If do not reach maximal value, then adjust the driving voltage of described display panels.
12. the detection method of display panels according to claim 1 is characterized in that it comprises the step whether maximal value of judging described flicker degree surpasses described threshold value in addition.
13. the detection method of display panels according to claim 1 is characterized in that described test pattern picture sampling and the mode of measuring are that this picture is divided into several measured zone.
14. the detection method of display panels according to claim 1 is characterized in that described test pattern picture sampling and the mode of measuring are to select at least one sweep trace.
15. the detection system of a display panels comprises:
One display panels is used to show a test pattern picture, and described display panels has a knob of adjusting driving voltage in addition;
One optical image-taking device is used to capture described test pattern picture; And
One controller, be used to calculate the shade of gray variation of picture that described optical image-taking device captures and produce master one flicker degree FL, and judging that whether this flicker degree FL surpasses a predetermined threshold value, wherein said flicker degree FL is the relational expression of the ratio of the amplitude that changes of shade of gray itself or amplitude and central value.
16. the detection system of display panels according to claim 15 is characterized in that described optical image-taking device is a CCD camera, CMOS video camera, single line style video camera or matrix type video camera.
17. the detection system of display panels according to claim 15 is characterized in that described flicker degree FL is determined by formula F L=K/Lb+M, the average amplitude up and down that on behalf of described shade of gray, Lb change, and K and M are coefficient.
18. the detection system of display panels according to claim 15 is characterized in that described flicker degree FL is determined by formula F L=K/La+M, the average amplitude that on behalf of this shade of gray, La change, and K and M are coefficient.
19. the detection system of display panels according to claim 15, it is characterized in that described flicker degree FL is determined by formula F L=KlogLc/La+M, the central value that on behalf of described shade of gray, Lc change, or the mean value of crest and trough, the average amplitude that on behalf of described shade of gray, La change, K and M are coefficient.
20. the detection system of display panels according to claim 15, it is characterized in that described flicker degree FL is determined by formula F L=KlogLc/Lb+M, Lc represents the central value of described shade of gray variation or the mean value of crest and trough, the average amplitude up and down that on behalf of described shade of gray, Lb change, K and M are coefficient.
21. the detection system of display panels according to claim 15, it is characterized in that described flicker degree FL is determined by formula F L=KlogLc/ (Lb/2)+M, Lc represents the central value of described shade of gray variation or the mean value of crest and trough, the average amplitude up and down that on behalf of described shade of gray, Lb change, K and M are coefficient.
22. the detection system of display panels according to claim 15, it is characterized in that described flicker degree FL is determined by formula F L=KlogLc/ (Lb-La)+M, Lc represents the central value of described shade of gray variation or the mean value of crest and trough, the average amplitude that on behalf of described shade of gray, La change, the average amplitude up and down that on behalf of described shade of gray, Lb change, K and M are coefficient.
23. the detection system of display panels according to claim 15 is characterized in that it comprises a test pattern generator in addition, is used to produce described test pattern.
24. the detection system of display panels according to claim 15 is characterized in that it comprises a fixed mount that can return turnback in addition, is used to adjust the position of described optical image-taking device.
25. the detection system of display panels according to claim 15 is characterized in that it comprises an optical image-taking device in addition, described two optical image-taking devices are the both sides that are arranged at the detection position of described display panels.
26. the detection system of display panels according to claim 15 is characterized in that it comprises a self-turning mechanism in addition, in order to adjust described knob.
CNB031034020A 2003-01-24 2003-01-24 Methos and system for detecting faceplate of liquid crystal display Expired - Fee Related CN100401042C (en)

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