JPS60134283A - Crt image output tester - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a test device for a CRT display device, and in particular, the present invention relates to a testing device for a CRT display device, and in particular, the present invention relates to a testing device for a CRT display device, and in particular, the present invention relates to a test device for testing a CRT display device, and in particular, the present invention relates to a testing device for a CRT display device. This invention relates to a CRT image output test device that tests whether or not images are accurately transmitted.

[Prior art]

Conventionally, whether or not one image information is correctly output on the CRT screen 111 has been checked by a person visually observing the CRT screen.

FIG. 1 is a block diagram of a conventional CRT display device.

In this figure, 1 is a CPU that sends monitor image information.

2 is a display controller that decodes the monitor image information sent by this cput; 3 is a direct generator that creates graphic data when the monitor image information is a graphic; 4 is a character data cassette when the monitor image information is a character. 5 is an image storage device for storing display data, 6 is a video circuit, and T is a CRT.

The operation will be explained below.

When testing whether or not regular information is displayed on the CRT screen, the monitor image information vcPU1 outputs it to the display controller 2, and the display controller 2 outputs it from the monitor image information vcPU1.
The contents are deciphered, and if it is a graphic display, it is activated to the linear generator 3.If it is a character display, it is activated to the character generator 4.Iw51i generator 3. The display information vcRT7 created by the character generator 4 is stored in the image storage device 5 corresponding to the screen, and the content vcRT7 of the image storage device 5 is stored in the video circuit 6 in synchronization with the synchronization signal of the scanning line of the CRT 7. It was displayed on the screen and judged whether it was good or bad by visually checking it.

The above-mentioned conventional CRT screen information display testing equipment relies on one person's visual inspection, so errors are often overlooked, and the testing time required to check thousands of dots of screen information is long. there were. Especially recently, high-resolution CRT
Graphic display devices that use 'lt have been announced, and complex screen displays consisting of dots are now being displayed, making it difficult to overlook errors with the conventional visual display confirmation method of screen information. However, there were drawbacks such as a further increase in testing time and poor efficiency.

[Overview of Umu Ming]

The present invention has been made in order to eliminate the above-mentioned drawbacks, and provides a comparison storage device that forms image information identical to a predetermined pattern stored in advance in an image storage device on a CRT display device and stores it as a monitor pattern. The present invention provides a CRT image output test device that performs high-speed and precise image diagnosis by providing a comparison/judgment device that sequentially compares both patterns bit by bit and diagnoses and displays image information.

[Embodiments of the invention]

FIG. 2 is a diagram showing the configuration of a plotter showing an embodiment of the present invention. Video circuit 6 is on a CRT display device.

Reference numeral 11 denotes a comparison storage device in which the same information as the display information to be displayed on the screen of the CRT 7 is stored. Reference numeral 12 denotes a comparison/determination device which checks whether the contents of the image memory of the image storage device 5 and the contents of the comparison storage device 11 are the same and displays the defective dot position w'lk. Line (A) is a timing signal for reading the contents of the comparison storage device 11, which uses the readout signal Z of the image storage device 5. Line (B) is a 7-donce bus synchronized with the image storage device 5 for detecting the position of the defective dot.

Next, the operation will be explained with reference to FIGS. 2 and 3.

If the checker pattern shown in FIG. 3 is the information that is desired to be displayed on the CRT screen, the information shown in FIG. 3 is correctly input into the comparison storage device 11 shown in FIG.

The image storage device 5 stores checker pattern information, which is test image information. The stored contents of the image storage device 5 and the comparison storage device R11 are read out at the read timing of the image storage device 5, and
The address is sequentially input to the comparison/judgment unit 12, and at the same time, the X and Y adds are also input to the comparison/judgment unit 12.

The data in the image storage device t5 inputted to the comparison/judgment device 12 and the data in the comparison storage device 11 are compared dot by dot,
If they match, the next input data is read, and if they do not match, the X, Y atomization information at that time is displayed to notify that the image data is defective.

As described above, by performing the test 7, first, it is possible to accurately check the quality of the screen information signal on a dot by dot basis.

Furthermore, even if the screen is a high-resolution summer display V with a large number of screen information dots, the test time will not take more than a few seconds, which is much more efficient than a visual test. In addition, since the test method of this invention does not require a CRT screen,
The test can be conducted without T.

〔Effect of the invention〕

As described above, the present invention is provided with a comparison storage device for storing missing monitor patterns and a comparison/judgment device that compares this monitor pattern with a predetermined pattern in units of t bits and displays an image diagnosis signal. It is now possible to judge the quality of the memory contents of an image storage device using digital processing, which is an accurate and quick way to judge the quality of the memory contents of an image storage device.
lJi1# diagnosis becomes possible. Further, even in the absence of a CRT, there are advantages such as the ability to diagnose the memory contents of the image storage device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the configuration of a conventional CRT display device, FIG. 2 is a block diagram of the configuration of an embodiment of the present invention, and FIG. 3 is a display for explaining the operation of the embodiment. It's a screen. In the figure, 1 is the CPU, 2 is the display/control device, and 3 is @
ii generator, 4 is a character generator, 5 is an image storage device, 6 is a video circuit, 7 is a CRT, 11 is a storage device for comparison, 12 is a comparison judger, A is a timing signal, B is 7
It is Donsu bus. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Masuo Oiwa (2 others) Figure 1 Figure 2 Figure 3 ■-・ Same・

Claims (1)

[Claims] In an image output device that writes image information into an image storage device and outputs the image information from the image storage device to the YCRT display screen for display, the same image information as a predetermined test pattern stored in advance in the image storage device is printed in a straight line. A storage device for comparison that stores the data formed by the generator and the character generator as a monitor pattern, and a comparison/judgment device that sequentially compares the predetermined test pattern and the monitor pattern bit by bit and displays an image diagnosis signal. A CRT image output test device with special characteristics.