JPH02143323A - Automatically testing instrument for displayed screen - Google Patents

Abstract

PURPOSE:To test the detection of a trouble accompanying the change of software displayed on a screen in a short time by taking in the data signal of one screen portion, and detecting the presence of the error of a displayed picture by comparing it with the data signal of one screen portion held in an internal part beforehand. CONSTITUTION:Display data on a display device 9 is stored on a memory by a bit image, and some compressed codes (e.g. CRC) in the horizontal and the vertical directions of one screen portion are generated on the basis of said data. A comparing part 5 compares them with picture display data (compressed data) before correction stored in an external storage device, and if the data are different, it displays the picture display data on the display device 9 by the bit image. Thus, the highly reliable test of the displayed picture can be performed automatically not through visual observation.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an automatic display screen test device, which is used for systems having display devices such as CITT. Available for inspection.

(Prior Art) In a system having a display device such as a CRT, a display screen is realized by controlling pixels using software, that is, display curve information output from an MPU (microprocessor unit). When display screen information is newly added/modified to change a part (pixel) of the display screen due to changes/additions to the display screen specifications, pixels that are not subject to change may be replaced by new pixels based on the display screen information. To confirm that no changes have been made due to additions/modifications, the operator has to check the old and new display screens each time. For example, as shown in the display screen shown in FIG. When there is a screen change that fills out the pixels of block 2, the pixels of block 3 may be filled out due to a problem with the software for the screen change. In this case, visual confirmation is generally used as a method for determining whether there are areas (pixels) that are filled in like block 3.

Here, - an example of a system with an in-shell display is shown in the seventh example.
As shown in the figure. That is, the display double-sided information D from the MPU 20
F is temporarily stored in the display 1 til JOI section 21, and the display control section 21 displays the display screen information DF on the display device 22 while synchronizing the data signal of the display screen information DF using the data/synchronization signal SY.

(Problems to be Solved by the Invention) According to the conventional visual display screen testing method, when the number of test display screens is large, it takes a lot of time and effort to compare the old and new display screens, and the test method is difficult. Since the pass/fail judgment is based on a visual comparison of the old and new display screens, there is a problem in that reliability is low. In other words, in a system that displays arbitrary information on a display device such as CB'r, when modifying or adding a certain arbitrary display screen, there is a way to confirm that data on other display screens is not destroyed. The most common method was to visually test the entire display screen. However, this test method requires fewer modifications 2
Even in the case of addition, the entire display screen must be reconfirmed,
The test required a lot of time, and the reliability was low because the test judgment was based on visual inspection.

The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to automatically perform a highly reliable display screen test in a short period of time, rather than by visual inspection. In other words, an object of the present invention is to ensure that adding or modifying certain arbitrary display screen data does not destroy other display screen data, and to ensure that all display screen data before modification and all display screen data after modification are An object of the present invention is to provide an automatic display screen test device that can automatically test a display screen by comparison.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides means for holding one screen worth of information from Data No. 3 to be sent to a display device for display, and a plurality of data signals for one screen. means for dividing the data into blocks and calculating a compressed code shorter than the actual data length for each block; means for retaining mountain opening information in a compression hood for each block; and means for specifying whether or not to compare screen information; We propose an automatic display screen testing device that is equipped with a means for determining whether the old and new display screens are equal or not, and a means for displaying errors in the display screen detected based on the above determination result on the display device as bit images. It is something.

That is, the present invention relates to a display screen automatic test device, and the object of the present invention is to capture data signals for one screen for sending screen information to a display device for display, This has been achieved by detecting the presence or absence of errors on the display screen by comparing the data signal for one screen with the data signal for one screen that is used to send the screen information to the display device for display. It has a compression code calculation function that divides the data into multiple blocks and codes the actual data for each divided block, and displays it by comparing it with the compressed code for each block that is stored internally. This is achieved by detecting the presence or absence of a spell on the screen.

(Function) The present invention has the above-described configuration, so that the opening surface 11+if
u in advance? Divide it into i number of blocks and hold it internally in compressed code, divide the screen information after the change into multiple blocks, calculate the compression code for each block, specify the block to be compared, and store it internally. Errors in screen information are detected by comparing the stored field surface information block by block. A block detected as an error is displayed as a bit image on a display device. Here, the compressed code is a code that can represent data b shorter than the actual data length calculated based on the actual data, for example, C
RC (Cyclic Redundancy Check)
k: Means the ``Ko'' of 通 (X m4 ri detection).

The division of one screen is shown in Figure 3 as 1 screen CRC of 71N.
, it is divided into multiple blocks based on horizontal division as shown in Figures 3 (A) and (B), and vertical division as shown in Figure 5 (^) and ([1). can do.

Note that Fig. 4 (11) shows the fourth part of Fig. 4 (A), and the fifth part
Figure (B) shows the 82nd section of Figure (A).

The present invention stores display data on a display device in a memory as a bit image, generates a compressed code (e.g. CNC) for one screen in the horizontal and vertical directions based on the data, and stores the data in an external storage device in advance. This is a dest method that compares the screen display data (compressed data) with the uncorrected screen display data (compressed data) described in , and displays the screen display data in a human image on the display device if the data differs.

(Example) FIG. 1 shows an example of the device of the present invention, in which Ml
Previously, settings were made by sending the display screen information DI to the display control section 2, sending the division number designation ND to the screen division number control section 3, and sending the comparison target block CB to the comparison block designation section 4. ing. The display control unit 2 has display devices 9 and 1.
Screen trembling (・Sends the data/synchronization signal O5 to the IJ division unit 6, and sets the division number designation data D[) to 1 to the screen division number control unit 34.
Screen information: Send to section 11, section 6.

The block-by-block CRC calculation unit 7 calculated (:nc to block [j
The comparison unit 5 sends the comparison result CM to the CM holding unit 8.
'It's supposed to be sent to the old one.

To explain the operation of such a configuration using the flowchart shown in Fig. 2, from the old μP, it is necessary to specify in advance at what ratio one display screen is to be divided horizontally or vertically, that is, to specify the number of divisions ND. is set in the screen division number control section 3 (step 51). Furthermore, the block to be inspected from the old MP, that is, the comparison target block CB, is set in the comparison block specifying section 4 (step 52). And Ml+
Based on the old display screen information DI, the display screen information such as the data/synchronization signal S and clock, which is the minimum unit of the data signal, is transferred from the display control section 2 to the one screen information dividing section 6. , the one-screen information dividing section 6 divides the sent display screen information into block-by-block display screen information for each block based on the division number designation data DD from the screen section 11 number control section 3 (step S3). .Here, 1 block is the 4th block.
Overlapping portions of horizontal blocks and vertical blocks arbitrarily divided in the horizontal direction of the figure and the vertical direction of FIG. 5, that is, blocks 1, 2, and 3 of FIG. 6 each correspond to one block.

The block-by-block CNC calculation unit 7 uses a generating polynomial P. BiXI6
A common word error detection code, ie, CRC, is calculated according to 1x12x5+1 (step S4). Then, only the CNC of the comparison target block on both sides of the new display is manually inputted to the comparison unit 5 (step 55), and only the CRC of the comparison target block on the reference display screen before being modified/changed is inputted from the block-by-block CRC holding unit 8. The comparison unit 5 is manually operated (step S6). The comparison section 5 compares the standard display screen and the new display screen.
Determine whether the RCs are equal or different (step S
7). If the two are equal and there are more blocks to be compared, the process returns to step S5 (step S8). If the two are different and an error is detected, the block in the portion different from the reference display screen is displayed (step S9).

If block 3 shown in FIG. 6 is detected as an error, the block 3 is sent as a bit image to the display device 9, thereby recognizing it as an error.

In the embodiments described above, CRC was used as an example of the compression code, but other compression codes may also be used.

(Effects of the Invention) As explained above, according to the present invention, there is provided a means for holding information for one screen from a data signal sent to a display device for display, and a block for dividing one screen's worth of data signal into a plurality of blocks. means for calculating a separate compression code; means for retaining mountain-opening surface information in a compressed code for each block; means for specifying whether or not to compare screen information; and means for determining whether or not the old and new display screens are the same. , and a means for displaying a bit image of the display screen detected based on the determination result on the display device, it is possible to detect defects due to changes in screen display software in a system having a display device. , it is possible to test reliably and automatically in a short time.

1.20...MPU, 2.21...Display control unit, 3...Screen division λ number control unit, 4...Comparison block designation unit, 5...Comparison unit, 6...1 Screen information division section, 7...block by block c
nc calculation section, 8... CRC holding section for each block, 9, 2
2...Display device.

Claims (1)

[Claims] 1. 1 for sending screen information to a display device for display
An automatic display screen test device characterized in that the presence or absence of an error on a display screen is detected by capturing a screen's worth of data signals and comparing them with one screen's worth of data signals held internally in advance. 2. The display screen automatic test according to claim 1, wherein a function is provided for specifying whether or not to perform a comparison for each block divided into a plurality of blocks, and errors in the specified plurality of blocks are detected. Device. 3. The display screen automatic test device according to claim 1 or 2, wherein the detected display screen error is displayed on the display device as a bit image. 4. 1 for sending screen information to the display device for display
It has a compression code calculation function that divides a screen's worth of data signals into multiple blocks and codes the actual data for each divided block, and compares it with the block-specific compression code stored internally in advance. 1. An automatic display screen test device, characterized in that the presence or absence of an error on a display screen is detected by doing so. 5. The display screen automatic test device according to claim 4, wherein the detected display screen error is displayed on the display device as a bit image.