CN101425246A - Method and device for detecting ghost phenomenon of display - Google Patents
Method and device for detecting ghost phenomenon of display Download PDFInfo
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- CN101425246A CN101425246A CNA2007101680074A CN200710168007A CN101425246A CN 101425246 A CN101425246 A CN 101425246A CN A2007101680074 A CNA2007101680074 A CN A2007101680074A CN 200710168007 A CN200710168007 A CN 200710168007A CN 101425246 A CN101425246 A CN 101425246A
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Abstract
The invention relates to a method for detecting the remnant trace of a display by using a vision model. The method comprises the following steps: a display is provided, and a testing picture is displayed on the display and is formed by a highest-level gray scale and a lowest-level gray scale; then aging is performed using the testing picture, after aging for a period of time, a medium-level picture is displayed on the display; an all-black part and an all-white part in the prior testing picture can leave remnant traces in a medium-level picture simultaneously. The remnant traces left by the display after aging are captured by an image capturing device; and at last, the vision model is used to imitate the feeling that human eyes see the remnant traces, and the remnant traces are graded according to the sensitivity of the human eyes seeing the remnant traces on the display.
Description
Technical field
The present invention relates to a kind of method and apparatus that detects the ghost (image-sticking) of display, and particularly relate to a kind of method and apparatus that can accurately judge the ghost grade of display.
Background technology
The phenomenon of display ghost is that the image or the profile of last tableaux appears in the follow-up picture.Just continue a segment length after the time, can occur when showing next picture that last tableaux is left to come image or profile at this picture when display shows a tableaux.If the phenomenon of the ghost of a display is serious, will influence the display quality of this display, therefore how detecting and measure display ghost grade is one of important problem.
The method of present employed detection ghost phenomena is to detect by measuring electronic signal, for example is to measure the voltage of driving circuit or electric current and changes in capacitance to judge whether tangible ghost phenomena is arranged.In addition, the somebody judges by the mode of the signal that measures light, for example uses the luminance variations of the picture of brightness photometer measurement display, to detect ghost phenomena.
In U.S. Pat 6,791, mention the method that measures ghost phenomena for 520, be display to be switched help black or complete white picture, use the briliancy of 13 some positions of brightness photometer measurement then, calculate the mean value of the briliancy of these 13 some positions afterwards again.Then, quantize the degree of ghost again by the variation of this mean value.This kind method is only considered the luminance variations of specified point position.Because the position that in fact ghost takes place is fixing, so said method measures at ad-hoc location and has little significance, and the method for averaging has weakened the effect of whole ghost phenomena on the contrary.
In addition, U.S. Pat 6,590,411st, by the capacitance that measures in the driving circuit, the difference of calculating capacitance again is used as judging the foundation that has or not ghost.But this kind method can't go out the sensation of human eye for ghost by real reaction.
From the above, because the ghost of display is not only the variation of simple physical quantity, it more involves the problem of human engineering (ergonomic), and just in fact human eye is seen the sensation of ghost.Therefore, the sensation of the ghost that human eye sees can not be actually described in the variation of the physical quantity of utilizing instrument merely and being measured.
Summary of the invention
The invention provides a kind of method and apparatus that detects the ghost of display, the sensation that it can the emulation human eye is with the grade of the ghost that determines display.
The present invention proposes a kind of method of using vision mode to detect the ghost of display, and it comprises provides a display, and shows that on display a test pictures is with wear out (burn-in).Utilizing test pictures to wear out after a period of time, on display, show a scala media gray scale picture, the gray scale of this scala media gray scale picture is between the minimum rank gray scale and maximum gray scale of display, and wherein the gray scale of the gray scale of test pictures and scala media gray scale picture is inequality.Afterwards by the image of image capture unit acquisition when display shows scala media gray scale picture.The signal of video signal that the image capture unit acquisition is captured quantizes then, sees the sensation of ghost image by vision mode emulation human eye.At last, will classify according to the order of severity of ghost.
In one embodiment, above-mentioned test pictures is made of at least one first pattern and the collocation of at least one second pattern, and the gray scale of first pattern and second pattern is inequality.
In one embodiment, the gray scale of the first above-mentioned pattern is the high-order gray scale of display, and the gray scale of second pattern is the lowest-order gray scale of display.
In one embodiment, above-mentioned first pattern and second pattern are that checkerboard type distributes.
In one embodiment, one of them is the central authorities that are positioned at test pictures for the first above-mentioned pattern and second pattern, and another is centered around first pattern and second pattern around one of them.
In one embodiment, above-mentioned test pictures comprises that one has the full frame of high-order gray scale, and its gray scale is higher than the gray scale of scala media gray scale picture, or a full frame with low order, and its gray scale is lower than the gray scale of scala media gray scale picture.
In one embodiment, the above-mentioned image that the image capture unit acquisition is captured quantizes, and comprises with the method for the sensation of simulating this image that human eye is seen and utilizes vision mode.
In one embodiment, above-mentionedly showing test pictures after a period of time, can on display, cause ghost, and this ghost can come out in scala media gray scale screen displayed.
In one embodiment, above-mentioned test pictures and scala media gray scale picture are the gray scale image, also can be chromatic images, as red image, green image or blue image.
In one embodiment, above-mentioned display is LCD or electric slurry display panel.
The present invention also proposes a kind of device that detects the ghost phenomena of display, and it comprises a pattern generator, an image capture unit, a vision mode and a controller.Pattern generator is electrically connected with a display, and figure that this pattern generator produces can input to display, so that display demonstrates a test pictures.Image capture unit is to be arranged at side before the display, and it is in order to the shown image that goes out of acquisition display.Vision mode is in order to the signal of video signal that image capture unit captured, and calculates the sensitivity of human eye to this stimulation, and converts the sensation that human eye is seen to.Controller is electrically connected with vision mode, pattern generator and image capture unit, its result, control pattern generator and control image capture unit in order to receive the emulation of vision mode institute.
In one embodiment, above-mentioned image capture unit comprises Charged Coupled Device or CMOS (Complementary Metal Oxide Semiconductor) assembly.
In one embodiment, above-mentioned figure that pattern generator produces is made of at least one first pattern and the collocation of at least one second pattern, and the gray scale of first pattern and second pattern is inequality.
In one embodiment, the gray scale of the first above-mentioned pattern is the high-order gray scale of display, and the gray scale of second pattern is the lowest-order gray scale of display.
In one embodiment, above-mentioned first pattern and second pattern are that checkerboard type distributes.
In one embodiment, one of them is the central authorities that are positioned at test pictures for the first above-mentioned pattern and second pattern, and another is centered around first pattern and second pattern around one of them.
In one embodiment, above-mentioned figure that pattern generator produces comprises that one has the full frame of high-order gray scale, and its gray scale is higher than the gray scale of scala media gray scale picture, or a full frame with low order gray scale, and its gray scale is lower than the gray scale of scala media gray scale picture.
The present invention is after carrying out testing procedure, the sensation of utilizing the image on the image capture unit acquisition display and its quantification being seen with the simulation human eye, serious Cheng Du according to ghost carries out classification again, the sensation of the ghost that the grade that defines like this can realistic human eye be seen.
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and be described with reference to the accompanying drawings as follows.
Description of drawings
Fig. 1 is the schematic representation of apparatus according to the ghost phenomena of the detection display of embodiments of the invention.
Fig. 2 A to Fig. 2 D is the synoptic diagram according to the detection picture of several embodiment of the present invention.
Shown in Figure 3 is according to the training mode of embodiments of the invention and the synoptic diagram of detecting pattern.
Shown in Figure 4 is detection method process flow diagram according to embodiments of the invention.
Fig. 5 A to Fig. 5 D is the synoptic diagram of four kinds of ghost grades.
The reference numeral explanation
102: pattern generator
104: image capture unit
106: vision mode
108: controller
110: display
112: test pictures
112a, 112b: pattern
300: training pattern
302: the ghost grade
304: the sensation factor of human eye
306: the ghost degree
400: detecting pattern
Embodiment
In general, whether the ghost grade that determines display can shipment be one of important index for display product.Therefore, before the display shipment, all need to wear out and make ghost and detect.The method of the ghost of detection display provided by the present invention can simulate human eye seen determine the ghost grade, and the method can be applied to various displays.Following embodiment is used for detailed explanation the present invention, implements according to this enabling those skilled in the art to, but is not in order to limit scope of the present invention.
Fig. 1 is the schematic representation of apparatus according to the ghost phenomena of the detection display of embodiments of the invention.Please refer to Fig. 1, the device that detects the ghost phenomena of display comprises a pattern generator 102, an image capture unit 104, a vision mode 106 and a controller 108.
Shown test pictures 112 is made of at least one first pattern 112a and at least one second pattern 112b collocation on display 110, and the gray scale of the first pattern 112a and the second pattern 112b is inequality.Preferably, the gray scale of the first pattern 112a is the high-order gray scale (for example being the 256th rank) of display, and the gray scale of the second pattern 112b is the lowest-order gray scale (for example being the 1st rank) of display.And in the test pictures 112 that Fig. 1 illustrated, the first pattern 112a and the second pattern 112b are that checkerboard type distributes.But the invention is not restricted to this, the test pictures that is presented on the display 110 can also be other kind image pattern, for example be shown in Fig. 2 A, the first pattern 112a is the central authorities that are positioned at test pictures 112, and the second pattern 112b is centered around around the first pattern 112a.Or shown in Fig. 2 A, the second pattern 112b is the central authorities that are positioned at test pictures 112 in this way, and the first pattern 112a is centered around around the second pattern 112b.In another embodiment, test pictures 112 can also be the full frame (for example being complete white picture) with high-order gray scale, and shown in Fig. 2 C, its gray scale (for example being the 256th rank) is higher than the gray scale of scala media gray scale picture.Or shown in Fig. 2 D, test pictures 112 can be the full frame with low order gray scale, and its gray scale (for example being the 1st rank) is lower than the gray scale of scala media gray scale picture.
In addition, please refer to Fig. 1, the image capture unit 104 of this pick-up unit is the place ahead that is arranged at display 110, and it is in order to the shown image that goes out of acquisition display 110.At this, image capture unit 104 comprises Charged Coupled Device, CMOS (Complementary Metal Oxide Semiconductor) assembly or other image sensing component.Image capture unit 104 can also comprise camera lens, Frame Grabber and computing machine or the like device.
In addition, as shown in Figure 1, vision mode 106 is to convert in order to the signal of video signal that image capture unit 104 is captured to be equal to the sensation that human eye is seen.More detailed explanation is that vision mode 106 can quantize the signal of video signal that image capture unit 104 is captured to see with the emulation human eye sensation of this image.In the present embodiment, vision mode 106 can use the disclosed vision mode of Taiwan patent announcement I267737, and it is the application's a reference paper.
In addition, in Fig. 1, controller 108 can be electrically connected with vision mode 106, image capture unit 104 and pattern generator 102.Controller 108 can receive 106 quantifications of vision mode or Simulation result, and converts Simulation result to the ghost grade.Controller 108 can also control pattern generator 102 produce specific figure to display 110 so that display 110 demonstrates test pictures 112, and can be controlled at time of showing test pictures 112 on the display 110, gray scale, figure or the like parameter.Controller 108 is the Push And Release of may command image capture unit 104 also.In the present embodiment, controller 108 for example is a computing machine.
And, can set up so-called ghost grade earlier utilizing before pick-up unit shown in Figure 1 carries out the detection of ghost phenomena of display.As shown in Figure 3, just before carrying out detecting pattern 400, can carry out training mode 300 earlier.And so-called training mode 300 will use the image of different ghost grades to carry out the people because of experiment exactly, to find out the threshold value of human eye in fact in various degree ghost, pointer with as assessment ghost grade for example can be divided into the ghost grade 1 grade, 2 grades ... ...At this, training mode 300 can go out corresponding ghost grade pointer at the display construction of inhomogeneity punishment or form.More detailed explanation is, meeting inputs to the various ghost degree 306 of the display of each type or form in the vision mode 106, and the sensation factor 304 of human eye is added in the vision mode 106, can find out the threshold levels pointer 302 of human eye for the sensitivity of different ghost phenomenas to produce.
After finishing above-mentioned training mode 300, just can begin to carry out detecting pattern 400.Below will utilize the detecting pattern collocation detection method process flow diagram that Fig. 4 illustrated that Fig. 3 illustrates to describe the method for ghost phenomena of the detection display of present embodiment in detail.
Please at first carry out step 400 simultaneously with reference to Fig. 3 and Fig. 4, promptly on display, show and test pictures a period of time just utilize test pictures to wear out.This step for example is to utilize controller shown in Figure 3 108 control pattern generators 102 to produce specific figure to display 110, wears out so that demonstrate test pictures on the display 110.And this test pictures for example is previous described pattern (for example being gridiron pattern or the like).At this moment, can make test pictures on display 110, continue aging a period of time, so that test pictures produces the phenomenon of ghost on display 110.
Then, carry out step 402, on display, show a scala media gray scale picture.This step for example is to utilize controller shown in Figure 3 108 control pattern generators 102 to produce a scala media gray scale picture on display 100.At this moment, because formerly in the step 400, the aging action of test pictures can produce ghost phenomena on display 100, therefore when in step 402, showing scala media gray scale picture, just can see the figure of previous test pictures in this picture, this is so-called ghost.And the gray scale of this scala media gray scale picture generally is the scala media gray scale part that belongs to the gray scale of display 110, for example, if to have the display of 256 rank gray scales, the gray scale of this scala media gray scale picture can be the arbitrary gray scale between 130 rank, the 90th rank to the.
Afterwards, carry out step 404, use the image capture unit pick-up image.This step for example is to utilize controller shown in Figure 3 108 control image capture units 104, captures with the image frame (image when promptly showing scala media gray scale picture) of display 110.And the signal of video signal that captures will be sent in the controller 108.
Then, carry out step 406, the image that captures is quantized the sensation of being seen with the emulation human eye.Afterwards, carry out step 408, the result that will quantize converts the ghost grade to again.This step then is to utilize before that obtained ghost grade 302 is used as pointer when training mode 300 shown in Figure 3, just when controller 108 quantize after the signal of video signal that gets off of capturing, just comparing with ghost grade 302, is to belong to which ghost grade to determine this signal of video signal.
Fig. 5 A to Fig. 5 D is used for describing four kinds of ghost grades in various degree, it is the image when display shows scala media gray scale picture, and the resolution chart that the test pictures before showing scala media gray scale picture is to use gridiron pattern to distribute, wherein Fig. 5 A is that the highest grade of ghost, Fig. 5 B is that the ghost grade is time high, Fig. 5 C is that the low and Fig. 5 D of ghost grade is that the ghost grade is minimum.In Fig. 5 A to Fig. 5 C, can significantly find out have the gridiron pattern of the test pictures of still having pattern hereinto between in the gray scale picture of rank, this is because the residual image down of previous test pictures aging action institute causes, even thereby switched to scala media gray scale picture, human eye still can be seen the figure of previous picture (test pictures) in this picture.Fig. 5 D then can't see tessellated figure in this picture, thereby Fig. 5 D is the ghost phenomena the lowest.
What deserves to be mentioned is, detection picture of the foregoing description and scala media gray scale picture illustrate as an example with the gray scale image, in fact, method and apparatus of the present invention can also be applied to the image frame of color, for example, red image, green image or the ghost of blue image detect, and just detecting picture and scala media picture is red image, green image or blue image.
Pick-up unit of the present invention and method can be classified the ghost phenomena shown in Fig. 5 A to Fig. 5 D in the mode of robotization, to avoid because of everyone the otherness ghost grade different situation of grading being arranged.And because apparatus and method of the present invention have added the sensation that vision mode is seen with the emulation human eye, therefore method and apparatus of the present invention compared to tradition to measure electronic signal or to use the method for measurement of brightness photometer, the ghost phenomena of more can the closing to reality human eye being experienced.
In addition, because method and apparatus of the present invention is to use image capture unit acquisition whole image, therefore, when carrying out quantitative analysis, can each position of whole image be performed an analysis one by one with controller when follow-up.Method and apparatus of the present invention can also analyze position, area or the like the parameter of ghost, with the reference as product or detection of process except can analyzing the ghost grade.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; those skilled in the art can do some changes and retouching under the premise without departing from the spirit and scope of the present invention, so protection scope of the present invention is as the criterion with the application's claim.
Claims (18)
1. method of using vision mode to detect the ghost phenomena of display comprises:
One display is provided;
Show that on this display a test pictures is to wear out;
Utilizing this test pictures to wear out after a period of time, on this display, show a scala media gray scale picture, the gray scale of this scala media gray scale picture is between the minimum rank gray scale and maximum order gray scale of this display, and wherein the gray scale of the gray scale of this test pictures and this scala media gray scale picture is inequality;
By the image of image capture unit acquisition when this display shows this scala media gray scale picture;
Utilize vision mode that the signal of video signal that this image capture unit captured is quantized, with the sensation of simulation this image that human eye is seen; And
The result of emulation is converted to the grade of ghost.
2. the method for the ghost phenomena of detection display as claimed in claim 1, wherein this test pictures is made of at least one first pattern and the collocation of at least one second pattern, and the gray scale of this first pattern and this second pattern is inequality.
3. the method for the ghost phenomena of detection display as claimed in claim 2, wherein the gray scale of this first pattern is the high-order gray scale of this display, the gray scale of this second pattern is the lowest-order gray scale of this display.
4. the method for the ghost phenomena of detection display as claimed in claim 2, wherein this first pattern and this second pattern are that checkerboard type distributes.
5. the method for the ghost phenomena of detection display as claimed in claim 2, wherein this first pattern and this second pattern one of them be the central authorities that are positioned at this test pictures, and another is centered around this first pattern and this second pattern around one of them.
6. the method for the ghost phenomena of detection display as claimed in claim 1, wherein this test pictures comprises that one has the full frame of high-order gray scale, its gray scale is higher than the gray scale of this scala media gray scale picture, or a full frame with low order, and its gray scale is lower than the gray scale of this scala media gray scale picture.
7. the method for the ghost phenomena of detection display as claimed in claim 1, the grade that wherein Simulation result is converted to ghost comprises according to human eye carries out classification to display ghost sensitivity.
8. the method for the ghost phenomena of detection display as claimed in claim 1 is wherein showing this test pictures, after a period of time of wearing out, can form ghost on this display, and this ghost can go out in this scala media gray scale screen displayed.
9. the method for the ghost phenomena of detection display as claimed in claim 1, wherein this test pictures and this scala media picture are gray scale image or chromatic image.
10. the method for the ghost phenomena of detection display as claimed in claim 9, wherein this chromatic image comprises red image, green image or blue image.
11. the method for the ghost phenomena of detection display as claimed in claim 1, wherein this display is LCD or plasma display.
12. a device that detects the ghost phenomena of display comprises:
One pattern generator, it is electrically connected with a display, and figure that this pattern generator produces can input to this display, so that this display demonstrates a test pictures;
One image capture unit is arranged at the place ahead of this display, and it is in order to capture the shown image that goes out of this display;
One vision mode, it is equal to the sensation that human eye is seen in order to the signal of video signal that this image capture unit captured is converted to; And
One controller, itself and this vision mode, this pattern generator and this image capture unit electrically connect, its in order to the result that receives this vision mode institute emulation, control this pattern generator and control this image capture unit.
13. the device of the ghost phenomena of detection display as claimed in claim 12, wherein this image capture unit comprises Charged Coupled Device or CMOS (Complementary Metal Oxide Semiconductor) assembly.
14. the device of the ghost phenomena of detection display as claimed in claim 12, wherein figure that this pattern generator produces is made of at least one first pattern and the collocation of at least one second pattern, and the gray scale of this first pattern and this second pattern is inequality.
15. the device of the ghost phenomena of detection display as claimed in claim 14, wherein the gray scale of this first pattern is the high-order gray scale of this display, and the gray scale of this second pattern is the lowest-order gray scale of this display.
16. the device of the ghost phenomena of detection display as claimed in claim 14, wherein this first pattern and this second pattern are that checkerboard type distributes.
17. the device of the ghost phenomena of detection display as claimed in claim 14, wherein this first pattern and this second pattern one of them be the central authorities that are positioned at this test pictures, and another is centered around this first pattern and this second pattern around one of them.
18. the method for the ghost phenomena of detection display as claimed in claim 12, wherein figure that this pattern generator produces comprises that one has the full frame of high-order gray scale, its gray scale is higher than the gray scale of this scala media gray scale picture, or the full frame with low order gray scale, its gray scale is lower than the gray scale of this scala media gray scale picture.
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