JPS635958B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field) The present invention relates to a test/inspection device for automatically testing a device equipped with a display section, and in particular to a test/inspection device for automatically testing a device equipped with a display section, and in particular for displaying various test patterns on the screen of the display section by operating the device under test for testing. In a device that performs testing by generating a pattern and evaluating the pattern by reading it with a television camera as an eye, the television camera is positioned (controlled) with enough precision to capture the pattern within the field of view of the camera. Also, it concerns how to read patterns within the field of view.

(Prior art and background) In factories, automating or labor-saving the testing and inspection process in the product manufacturing process has been relatively delayed compared to other processes.
In recent years, with improvements in the performance of computers as brains, television cameras as eyes, and operating hands as limbs, we are opening an era of practical application both technologically and economically, but problems still need to be solved at a concrete level. There are many problems that cannot be solved.

For example, in order to test a device under test, if you try to read the display contents with a camera to perform pattern recognition from a CRT (cathode ray tube) screen, which is the most commonly used display section of the device, it is difficult to read the display contents using a camera. There are many things that are different from other media. To give a more specific example, if the screen is not flat and the display position of the screen on a CRT is also the object of measurement, there is no standard for positioning the field of view of the camera with respect to the display pattern on the screen.
On the other hand, when trying to inspect and evaluate the resolution, linearity, distortion, etc. of the image on the screen, the camera requires a resolution (resolving power) higher than that of the display, but the number of reading points to read within the field of view is fixed. In order to increase the resolution, the field of view for reading must necessarily be made smaller, which is inconsistent with the above condition.

Furthermore, even if the field of view is determined and the position is determined by taking into account intervening error factors, it is not possible to know in which part of the field of view the desired pattern is located unless it is based on the data read by the camera as it scans and scans the field of view. Because this is not clear, normally in such a configuration, the entire field of view is scanned, the data is first imported into memory, and then the data necessary for evaluation is extracted from it, but this method requires a large amount of memory capacity. In addition, there is a drawback that it takes extra time to acquire meaningful data by reading and scanning just to determine the location of valid data other than the data actually used for evaluation. Ta.

(Characteristics of purpose) In view of the above, the purpose of the present invention is to position the camera side to such an extent that the test pattern (reading target for the test) displayed at a specific position on the screen can be accommodated within the field of view. It is an object of the present invention to provide a method for efficiently finding and reading a portion of a test pattern, and a feature of the present invention is to provide a method for efficiently finding and reading out a portion of a test pattern. In the testing apparatus, the test apparatus has a means for generating a pattern to be measured in a part, a means for capturing the generated pattern in a field of view and scanning the field of view to read the pattern, and a means for controlling the operation procedure of these. Adding an antenna pattern consisting of a pair of lines extending the outer boundary of the area outside the area where the pattern to be measured placed in a predetermined part of the screen of the device exists and at least on one of the four circumferences of the area; , a step of sequentially scanning the periphery of the field of view to detect the antenna pattern as the region search step on the reading means side;
The present invention has a procedure of scanning a field of view including the above-mentioned existence area in a direction perpendicular to the scan when detecting the previous antenna pattern and capturing data based on the position data obtained by the detection.

(Example) Fig. 1 and Fig. 2 are conceptual explanatory diagrams of the object of the present invention, Fig. 1 shows the conceptual configuration of a device for testing a device to be inspected, and Fig. 2 shows a functional configuration block. It is a diagram.

As is clear from the figure, the display section 1a, the memory 1
b. The device to be inspected 1 having an operation keyboard 1c is positioned and placed on a measurement stage 3a on a conveyor line 3, and the keyboard operation mechanism 2a and adjustment switches for brightness etc. on the device side are operated in correspondence with the measurement stage 3a. A lens system 4 that has an operation section 2 equipped with a mechanism 2b, etc., and that can control focus adjustment and zooming for observing the display section 1a further ahead.
A television camera 4 having a radiance of 100 nm and a brightness meter 5 for monitoring the amount of received light are fixed on a movable base 6 whose positioning can be controlled in the vertical (Y) direction.
A moving platform 7 that can be positioned and controlled in the left and right (X) direction
It is fixed on the top and constitutes a television camera operation section 8.

9 is a general term for the electrical parts of the test device, including a switch control part 9a that operates the operation part 2, camera operation part 8, and television camera 4, and a keyboard control part 9.
b, a movable table control section 9c, a lens control section 9d that controls zoom focus, etc., a buffer 9e that creates brightness data from the light amount of the light meter and the state of the lens, a scan control section 9f that controls scanning, and a television camera. A video frame memory 9g for storing data read from before capture, an evaluation recognition unit 9h for determining data recognition, a procedure control unit for executing these controls, a procedure memory for storing procedures, and a memory for storing results. A procedure control unit 9j having a control unit 9j operates the device under test 1 according to the test procedure, generates a predetermined test pattern at a predetermined position on the display unit 1a, and displays the predetermined test pattern for measuring test items prepared in advance. Move and position the TV camera 4 based on the coordinates with the position of The test pattern is scanned, the test pattern is read, recognition and judgment is performed for each test item, and the results are stored in memory.

Through these configurations and procedures, the amount of reflected light from the display screen, the dimensions of the display area, the position on the CRT,
When inspecting distortion of the display area, linearity of scanning lines, brightness, resolution, etc., but partial measurement within the display area is required; in other words, you are trying to measure unevenness in brightness or resolution for each part of the screen. The present invention is characterized by a method of determining a scanning position for reading a test pattern at a predetermined position on a screen.

Figure 3 and the following are explanatory diagrams of one embodiment of the present invention. Figure 3 explains the data of the resolution test pattern and the brightness pattern read out. When (a) is in good focus, (b) is in focus. The data for the worst case is shown.

Figure 4 explains the location of the pattern on the display screen, the auxiliary pattern, and the field of view of the television camera. Nine grid-shaped hatch areas sandwich the area where the test pattern exists and the outer edge of the area. A pair of auxiliary patterns extending in the horizontal direction are antenna patterns that are characteristic of the pattern side of the present invention.

The dotted square is the field of view of the television camera positioned aiming at the test pattern.

FIG. 5 is for explaining the reading scan of the television camera.

As shown in Figure 5, the field of view of the television camera that captures the test pattern with the antenna pattern added is always somewhere around the field of view, in this case, the antenna is stretched horizontally, so the field of view is either the right edge or the left of the field of view. If one of the ends is scanned vertically, it will always cross the antenna mark, so the antenna mark signal can be read.

Therefore, when reading information from a portion of the test pattern by scanning, the scanning procedure is to first scan the right edge, for example, and if the antenna pattern information cannot be detected, repeat the scanning at the left edge. The recognition unit 9h performs feature analysis on the read data taken into the memory and scans the surrounding area until the antenna pattern feature is detected, and when the antenna pattern is detected, the address ya of the pair of signals of the antenna pattern is determined. yb
By setting the y-address within the interval between the lines and scanning in the x-direction to read the test pattern, the area where data exists can be detected with at most a few search scans, and then the area can be targeted. All you need to do is to scan the data for evaluation, and the procedure to determine the area where the necessary data exists is faster than the method of scanning the entire field of view and then cutting out the test pattern from the read data. This makes it extremely easy to use, and the amount of video frame memory that must be prepared can be reduced.

Note that the antenna pattern may be prepared in advance in the device under test along with a response program corresponding to the test, or it may be supplied from the test device, but the antenna pattern may be provided in the device under test itself with an input section such as the memory device 1b. A device equipped with an arithmetic unit is more convenient because response programs, pattern data, etc. can be read from the memory device 1b.

(Effects) As explained above, according to the present invention, even when it is clear that necessary data exists within the field of view, but its location is unknown, it can be obtained by searching and scanning at most several times. Because it is possible to reliably know the area where the data exists by decoding the data, compared to scanning the entire field of view and capturing area data,
This brings about the unique effect of being able to easily import only the necessary data.

[Brief explanation of the drawing]

FIGS. 1 and 2 are conceptual explanatory diagrams of the present invention, and FIGS. 3, 4, and 5 are explanatory diagrams of one embodiment of the present invention.

Claims (1)

[Claims] 1 means for generating a pattern to be measured on the display section of a device to be inspected having a display section by operating the device to be inspected; In a test device having a means for reading the pattern and a means for controlling the operating procedure thereof, the test device is located outside the area where the pattern to be measured is located in a predetermined part of the screen of the display unit and at least one of the four circumferences of the area. adding an antenna pattern consisting of a pair of lines extending the outer boundary of the area, and detecting the antenna pattern by sequentially scanning the periphery of the field of view as a search procedure for the area on the reading means side; The present invention is characterized by having a procedure of scanning a field of view including the existence area in a direction perpendicular to the scan when the previous antenna pattern was detected based on the position data obtained by the detection and capturing data. Data acquisition method.