CN103985335A - LED (Light Emitting Diode) display device heat dissipation uniformity detection method, detection device and detection system - Google Patents
LED (Light Emitting Diode) display device heat dissipation uniformity detection method, detection device and detection system Download PDFInfo
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Abstract
The invention relates to an LED (Light Emitting Diode) display device heat dissipation uniformity detection method, an LED display device heat dissipation uniformity detection device and an LED display device heat dissipation uniformity detection system. The detection method comprises the following steps: controlling an LED display device to display monochromatic pictures; shooting monochromatic pictures displayed by the LED display device for multiple times at preset time intervals to obtain a plurality of detection images corresponding to different moments; analyzing the plurality of detection images to extract brightness values of a plurality of LED lamp points in each detection image and calculating to obtain brightness variation information of the plurality of LED lamp points; and evaluating the heat dissipation uniformity of the LED display device according to the distribution condition of the brightness variation information of the plurality of LED lamp points. According to the LED display device heat dissipation uniformity detection method, by utilizing the characteristics of LED brightness change and temperature correlation, and combining with an image shooting and image analyzing technology, the distribution condition of the brightness variation information of all LED lamp points in the LED display device is obtained, thus the temperature distribution condition during displaying of the LED display device is indirectly obtained, and the purpose of heat dissipation uniformity detection is achieved.
Description
Technical field
The present invention relates to display screen detection technique field, particularly dispel the heat inhomogeneity detection method, pick-up unit and detection system of LED display device.
Background technology
Due to the inhomogeneous reason of heat radiation that physical characteristics and the circuit design of production technology, device causes, various display device ubiquities multi-form display defect, and these display defects can produce impact in various degree to display effect.Therefore, in the research and production process of display screen, be necessary product to dispel the heat and whether detect uniformly.In prior art, for heat radiation homogeneity, detect and to mainly contain two kinds: (1) adopts infrared temperature instrument, but it need to carry out two-dimensional scan, line by line, causes detection efficiency low; (2) adopt thermal infrared imager, but its range of application is little, cost is high.
Along with the fast development of LED display technique, objective, the accurate evaluation of LED display display quality also more and more come into one's own.LED display supplier expects to obtain accurately, comprehensive image quality evaluation result, and the counter defect of looking into manufacturing process, so that improve LED display quality, the raising market competitiveness; LED display is bought business and is also concerned about in a hurry the problem of LED display image quality evaluation.Along with LED display industrialization process and market competition are day by day fierce, for the evaluation of LED display picture quality, new requirement has also been proposed.
Summary of the invention
Therefore, the present invention proposes a kind of heat radiation of new LED display device uniformity detecting method, pick-up unit and detection system.
Particularly, a kind of LED display device heat radiation uniformity detecting method that the embodiment of the present invention proposes, comprises step: (a) control LED display device and show sprite; (b) with Preset Time interval, repeatedly take the described sprite that described LED display device shows and obtain not detection image in the same time of a plurality of correspondences; (c) described a plurality of detections being carried out to analyzing and processing with image detects with the brightness value of a plurality of LED lamp points in image and calculates the brightness changing quantity information of described a plurality of LED lamp points to extract each; And the heat radiation homogeneity of (d) assessing described LED display device according to the distribution situation of the brightness changing quantity information of described a plurality of LED lamp points.
In addition, a kind of LED display device heat radiation uniformity detection that the embodiment of the present invention proposes, comprising: display control module, shooting control module, image analysis processing module and evaluation module.Wherein, display control module is used for controlling LED display device and shows sprite.Take control module and for controlling camera and repeatedly taking with Preset Time interval the described sprite that described LED display device shows, obtain not detection image in the same time of a plurality of correspondences.Image analysis processing module detects with the brightness value of a plurality of LED lamp points of image and calculates the brightness changing quantity information of described a plurality of LED lamp points to extract each for described a plurality of detections are carried out to analyzing and processing with image.Evaluation module is for assessing the heat radiation homogeneity of described LED display device according to the distribution situation of the brightness changing quantity information of described a plurality of LED lamp points.
In addition, a kind of LED display device heat radiation homogeneity detection system that the embodiment of the present invention proposes, is characterized in that, comprising: the computing machine of analysis of heat transmission software is installed, and image capture device.Image capture device signal connects described computing machine.Wherein, when described in described computer run during analysis of heat transmission software, it is controlled LED display device and shows sprite, controlling described image capture device repeatedly takes with Preset Time interval the described sprite that described LED display device shows and obtains not detection image in the same time of a plurality of correspondences, described a plurality of detections are carried out to analyzing and processing with image to be detected with the brightness value of a plurality of LED lamp points in image and calculates the brightness changing quantity information of described a plurality of LED lamp points to extract each, and the heat radiation homogeneity of assessing described LED display device according to the distribution situation of the brightness changing quantity information of described a plurality of LED lamp points.
As from the foregoing, the embodiment of the present invention is utilized the characteristic of LED brightness change and temperature correlation, combining image shooting and image analysis processing technology are obtained the distribution situation of the brightness changing quantity information of each LED lamp point in LED display device, Temperature Distribution situation while indirectly obtaining whereby the demonstration of LED display device, thus the object of heat radiation homogeneity detection reached.As can be seen here, the embodiment of the present invention can detect evaluation to the heat radiation homogeneity of LED display device simply and effectively, and DuiLED display device producer improves manufacturing process positive facilitation, have more practical significance.
By the detailed description below with reference to accompanying drawing, it is obvious that other side of the present invention and feature become.But it should be known that the only object design for explaining of this accompanying drawing, rather than as the restriction of scope of the present invention, this is because it should be with reference to additional claim.Should also be appreciated that, unless otherwise noted, the unnecessary accompanying drawing of drawing to scale, they only try hard to illustrate conceptually structure described herein and flow process.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Fig. 1 is the application schematic diagram of a kind of LED display heat radiation homogeneity detection system of the embodiment of the present invention.
Fig. 2 is the flow chart of steps of a kind of LED display heat radiation uniformity detecting method of the embodiment of the present invention.
Fig. 3 is the module diagram of a kind of LED display heat radiation uniformity detection of the embodiment of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Please refer to Fig. 1, the application schematic diagram of its a kind of LED display heat radiation homogeneity detection system that is the embodiment of the present invention.As shown in Figure 1, LED display heat radiation homogeneity detection system 100 comprises for example area array cameras 130 of the image capture device that the computing machine 110 of analysis of heat transmission software 111 is installed and is connected with described computing machine 110 signals.More specifically, computing machine 110 for example connects the LED display control system (not shown in figure 1) of LED display 300 front ends by netting twine or WiFi; Area array cameras 130 is for taking (also carrying out image acquisition) to the display frame of LED display 300, there is the larger picture of single acquisition, it is for example by data line, to form signal with computing machine 110 to be connected, and preferably area array cameras 130 is the area array CCD camera of advantages such as having that resolution is high, dynamic range is large, photoelectric transformation efficiency is high and power consumption is little, but the present invention is not as limit.
Please also refer to Fig. 1 and Fig. 2, the flow chart of steps of a kind of LED display heat radiation uniformity detecting method that Fig. 2 is the embodiment of the present invention.Below in conjunction with Fig. 1 and Fig. 2, the LED display heat radiation uniformity detecting method of the embodiment of the present invention is elaborated, particularly, first operation is installed on the analysis of heat transmission software 111 on computing machine 110, carries out successively afterwards following steps S11, S13, S15 and S17:
Step S11: control LED display 300 and show red picture.Specifically can be: in LED display 300, during in blank screen, the analysis of heat transmission software 111 in computing machine 110 sends a command to LED display control system and shows red picture to control LED display 300; At this, red picture is comprised of a plurality of red LED lamp points of lighting.
Step S13: repeatedly take the red picture that LED display 300 shows and obtain not detection image in the same time of a plurality of correspondences with Preset Time interval.Specifically can be, analysis of heat transmission software 111 chain of command array cameras 130 in computing machine 110 are repeatedly taken, for example LED display 300 blank screens light and after showing red picture immediately chain of command array camera 130 take for the first time, until LED display 300 work a period of times, for example take for the second time after 5 minutes, until LED display 300 a period of time of working again, for example take for the third time again after 5 minutes; Thereby can obtain not detection image in the same time of three correspondences, these detections will be sent to computing machine 110 by area array cameras 130 with image.At this, it should be noted that, the number of times of red picture photographing is no less than for example calculating of brightness decay number percent of brightness changing quantity information that can realize red LED lamp point for twice, but, in order to reach higher heat radiation homogeneity accuracy of detection, can consider take several times more.In addition, the time interval of shooting can, for uniformly-spaced, also can be unequal interval.
Step 15: a plurality of detections are carried out to analyzing and processing with image and detect with the brightness value of a plurality of LED lamp points in image and calculate the brightness changing quantity information of described a plurality of LED lamp points to extract each.Specifically can be: 111 pairs of analysis of heat transmission softwares in computing machine 110 are transmitted by area array cameras 130 and each detection of coming is carried out LED lamp point location with image, after LED lamp point location, extract the brightness value of each red LED lamp point, and calculate each red LED lamp point in brightness changing quantity information in the same time not, for example calculate and take for the second time the brightness value of each red LED lamp point of the moment with respect to the decay number percent of the brightness value of each red LED lamp point of the moment of shooting for the first time, and calculate and take for the third time the brightness value of each red LED lamp point of the moment with respect to the decay number percent of the brightness value of each red LED lamp point of the moment of shooting for the first time.In the present embodiment, LED lamp point location belongs to a kind of image processing techniques of maturation, does not repeat them here.
Step S17: the heat radiation homogeneity of assessing described LED display device according to the distribution situation of the brightness changing quantity information of described a plurality of LED lamp points.Specifically can be: the distribution situation of the brightness decay number percent of analysis of heat transmission software 111 each red LED lamp points of statistics synchronization in computing machine 110, for example the brightness decay number percent of each red LED lamp point constantly of taking for the second time calculating in step S15 is carried out statistical study and/or the brightness decay number percent of each red LED lamp point constantly of taking for the third time calculating in step S15 is carried out to statistical study; If the red LED lamp point brightness fall in a certain region at synchronization compared with the brightness fall of whole LED display large (being also that brightness decay number percent is bigger than normal), can learn the height that the temperature in this region rises compared with environment temperature, and then can show that LED display 300 exists the problem of local dispel the heat inhomogeneous or manufacturing process; If each red LED lamp point of whole LED display 300 is roughly the same at the brightness decay number percent of synchronization, can think that LED display 300 does not exist the problems such as local heat radiation is inhomogeneous.
Afterwards, for making testing result more comprehensively, can further control LED display 300 and show green picture, blue picture, and carry out respectively again above-mentioned steps S11 to S17 when showing green picture and blue picture.For full-color LED display screen, because the brightness change of red LED lamp point is fastest, the light tone change speed of green LED lamp point is taken second place, it is the slowest that the brightness of blue led lamp point changes speed, therefore preferably first controls LED display and show that red picture is for shooting and image analysis processing, then show that green picture is for shooting and image analysis processing, finally show that bluer picture is for taking and image analysis processing.The display order of sprite is set according to the brightness change speed of the shades of colour LED lamp point in LED display in brief.
Please refer to Fig. 3, the module diagram of its a kind of LED display heat radiation uniformity detection that is the embodiment of the present invention.In the present embodiment, LED display heat radiation uniformity detection is installed on as shown in Figure 1 the analysis of heat transmission software 111 of computing machine 110 and realizes.As shown in Figure 3, LED display heat radiation uniformity detection comprises display control module 111a, takes control module 111b, image analysis processing module 111c and evaluation module 111d.Wherein, display control module 111a is used for sending and shows that control command controls LED display and show sprite; Taking control module 111b takes control command and comes chain of command array camera repeatedly to take with Preset Time interval the sprite that LED display shows and obtain not detection image in the same time of a plurality of correspondences for sending; Image analysis processing module 111c detects with the brightness value of a plurality of LED lamp points of image and calculates the brightness changing quantity information of described a plurality of LED lamp points to extract each for described a plurality of detections are carried out to analyzing and processing with image; And evaluation module 111d is for assessing the heat radiation homogeneity of LED display according to the distribution situation of the brightness changing quantity information of described a plurality of LED lamp points.
It is worth mentioning that, heat radiation homogeneity detection system, detection method and the pick-up unit of the embodiment of the present invention are not limited to be applied in LED display, also can be applicable to other LED display device, for example LED casing or even LED lamp plate.
In sum, the embodiment of the present invention is utilized the characteristic of LED brightness change and temperature correlation, combining image shooting and image analysis processing technology are obtained the distribution situation of the brightness changing quantity information of each LED lamp point in LED display device, Temperature Distribution situation while indirectly obtaining whereby the demonstration of LED display device, thus the object of heat radiation homogeneity detection reached.As can be seen here, the detection system of the embodiment of the present invention and detection method can detect evaluation to the heat radiation homogeneity of LED display device simply and effectively, and DuiLED display device producer improves manufacturing process positive facilitation, have more practical significance.
So far, applied specific case herein principle and the embodiment of the heat radiation of LED display device uniformity detecting method, pick-up unit and detection system of the present invention are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention; all will change in specific embodiments and applications; in sum, this description should not be construed as limitation of the present invention, and protection scope of the present invention should be as the criterion with appended claim.
Claims (8)
1. a LED display device heat radiation uniformity detecting method, is characterized in that, comprises step:
Control LED display device and show sprite;
With Preset Time interval, repeatedly take the described sprite that described LED display device shows and obtain not detection image in the same time of a plurality of correspondences;
Described a plurality of detections are carried out to analyzing and processing with image to be detected with the brightness value of a plurality of LED lamp points in image and calculates the brightness changing quantity information of described a plurality of LED lamp points to extract each; And
According to the distribution situation of the brightness changing quantity information of described a plurality of LED lamp points, assess the heat radiation homogeneity of described LED display device.
2. LED display device heat radiation uniformity detecting method as claimed in claim 1, is characterized in that, described control LED display device shows that the step of sprite comprises:
Controlling described LED display device lights a plurality of LED lamp points of same color and obtains described sprite.
3. LED display device heat radiation uniformity detecting method as claimed in claim 2, is characterized in that, a plurality of LED lamp points of described same color are red LED lamp point, green LED lamp point or blue led lamp point.
4. LED display device as claimed in claim 1 heat radiation uniformity detecting method, it is characterized in that, described with Preset Time interval repeatedly take the described sprite that described LED display device shows and obtain a plurality of correspondences not detection in the same time by the step of image, comprise:
Controlling image capture device repeatedly takes with Preset Time interval the described sprite that described LED display device shows and obtains not detection image in the same time of a plurality of correspondences.
5. LED display device heat radiation uniformity detecting method as claimed in claim 4, is characterized in that, described image capture device is area array cameras.
6. a LED display device heat radiation uniformity detection, is characterized in that, comprising:
Display control module, shows sprite for controlling LED display device;
Take control module, for controlling image capture device, with Preset Time interval, repeatedly take the described sprite that described LED display device shows and obtain not detection image in the same time of a plurality of correspondences;
Image analysis processing module, detects with the brightness value of a plurality of LED lamp points of image and calculates the brightness changing quantity information of described a plurality of LED lamp points to extract each for described a plurality of detections are carried out to analyzing and processing with image; And
Evaluation module, for assessing the heat radiation homogeneity of described LED display device according to the distribution situation of the brightness changing quantity information of described a plurality of LED lamp points.
7. a LED display device heat radiation homogeneity detection system, is characterized in that, comprising:
The computing machine of analysis of heat transmission software is installed; And
Image capture device, is connected with described Computer signal;
Wherein, when described in described computer run during analysis of heat transmission software, it is controlled LED display device and shows sprite, controlling described image capture device repeatedly takes with Preset Time interval the described sprite that described LED display device shows and obtains not detection image in the same time of a plurality of correspondences, described a plurality of detections are carried out to analyzing and processing with image to be detected with the brightness value of a plurality of LED lamp points in image and calculates the brightness changing quantity information of described a plurality of LED lamp points to extract each, and the heat radiation homogeneity of assessing described LED display device according to the distribution situation of the brightness changing quantity information of described a plurality of LED lamp points.
8. LED display device heat radiation homogeneity detection system as claimed in claim 7, is characterized in that, described image capture device is area array cameras.
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| CN105679219A (en) * | 2016-03-25 | 2016-06-15 | 深圳市华星光电技术有限公司 | AMOLED display panel detection method and detection device |
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