JP2686567B2 - Test pattern generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a test pattern generator, and more particularly to a test pattern generator for a CRT display device.

[0002]

2. Description of the Related Art A CRT display device is adjusted before shipment so as to display a desired display. The intended display is, for example, displaying a predetermined pattern at a predetermined position with a predetermined size and angle, and the colors of red (R), green (G), and blue (B) depending on the gradation. Be displayed in color. Alternatively, it is displayed with correct focus (the displayed image has no distortion).

In order to perform the above test, the CRT display device under test is driven by a clock signal having a frequency conforming to the standard and horizontal and vertical synchronizing signals, and a test pattern conforming to the standard is input. The device is called a test pattern generator.
FIG. 3 is a block diagram of a conventional test pattern generator, and here it is assumed that there are three types of CRT display devices to be tested.

That is, the clock oscillator 10 has three clocks.
Lock oscillator 12₁, 12_Two, 12 _ThreeAnd clock dry
The clock driver 11 is a switch S.
₁By the oscillator 12₁, 12_Two, 12_ThreeInside
It is designed so that you can select either one of them. test
The pattern generator 20 that outputs the pattern required for
A character generator that is a ROM that stores turn data
Rator 22 (22₁, 22_Two, 22_Three) And the character
Image data from the digital generator 22 to a CRT display device
It is better than the video RAM 21 that is stored once before being displayed on
You. This character generator 22 is also tested C
3 types are available that store figures that meet the specifications of RT display devices.
And switch S_TwoSelected in the above
It is connected to the ORAM 21.

Further, the horizontal and vertical synchronizing signals suitable for the CRT display device to be tested are the clock driver 11 mentioned above.
A horizontal counter 31 and a vertical counter 41, which are provided in the horizontal synchronizing signal generator 30 and the vertical synchronizing signal generator 40, are formed on the basis of the clock signal output from the above.
The frequency division ratio for the clock signal for forming the horizontal synchronizing signal is set to the horizontal ROM 32 (32 ₁ , 32 ₂ , 32).
₃ ), each horizontal ROM 32 ₁ , 32 ₂ ,
32 ₃ is alternatively connected to the horizontal counter 31 by a switch S ₃ . In addition, the frequency division ratio for the clock signal for forming the vertical synchronization signal is the vertical ROM 42 (4
2 ₁ , 42 ₂ , 42 ₃ ) and each vertical RO
M42 ₁ , 42 ₂ , and 42 ₃ are alternatively connected to the vertical counter 41 by the switch S ₄ .

The video signal from the video RAM 31 and the horizontal and vertical sync signals from the horizontal counter 31 and the vertical counter 41 correspond to the respective standards of the CRT display device to be tested, and the display driver 50 (50 ₁ , 50 ₂ ,
50 ₃ ) is input to each display driver 50
(50 _1, 50 _2, 50 ₃₎ output is input to alternatively connector IF _1, IF _2, IF ₃ by the switch S _5, further, the three connectors IF _1, IF _2, IF ₃
Is selectively selected by the switch S ₆ and input to the display device.

A gradation signal from a gradation selector 80 is inputted to the display driver 50 so that the display color and its gradation can be changed. That is,
FIG. 4 shows the gradation selector 80 and the display driver 50 (50 ₁ , 50 ₂ , 50 ₃ ) in FIG. 3 in more detail. The gradation selector 80 includes a gradation selection switch 81 for selecting any of 16 gradations, and the output of the gradation selection switch 81 is a converter 82.
Is converted into a binary code by the R.P. G. FIG. B. Is input to the DA converter 51 (51R, 51G, 51B) of each color. Here, it is converted into a voltage value corresponding to the gradation selected by the gradation selection switch 81, and the gradation is given to the image data from the video RAM 21. Each color signal output from the DA converter 51 can be freely selected in a color combination by a color selection switch 52. The outputs from the horizontal counter 31 and the vertical counter 41 are input to the horizontal and vertical sync signal drivers 53, respectively. Further, the outputs of the color selection switch 52 and the sync signal driver 53 are input to the connector IF.

FIG. 5 shows a CRT display using such a device.
1 illustrates one step of a procedure for testing a device. Ma
No, the model of CRT display device to be tested
Depending on the oscillator 12₁, 12_Two, 12_ThreeOne of
One, character generator 22₁, 22_Two, 22_Three
One of the above, horizontal ROM 32, vertical ROM 42
Switch S to any one of₁~ S_FourSelected by
I do. Further driver 52 ₁, 52_Two, 52_ThreeAnd connect
IF₁, IF_Two, IF_ThreeSwitch S_Five, S₆By
To select. And as shown in FIG. 5, the oscillation frequency
Setting F1 → Display pattern setting F2 → Display color setting F3 →
Display brightness / gradation setting F4 → Perform adjustment confirmation work F5
Cycle, clock frequency, display pattern, display
Change at least one of color, display brightness and gradation
Then, one-step test is performed. This process is frequency
Or it is done from various angles by changing the pattern.
The steps 1 to F5 are performed about 30 times.

Therefore, as described above, the oscillator 12
The oscillator (eg, oscillator 12 ₁ ) is capable of oscillating a plurality of frequencies, and which frequency is to be oscillated is determined by a key input from the control device 10 for each process, and a logical switch in the oscillator (eg, oscillator 12 ₁ ) is selected. (Or a relay). In addition, the character generator 22 (for example, the character generator 22 ₁ )
Also, multiple figures used for each process are stored,
The address of the required graphic is designated by the key of the controller 10 for each process. Similarly, the horizontal ROM 32 and the vertical ROM 42 also store a plurality of frequency division values necessary for each process, and the horizontal driver 31 and the vertical driver 31 are read according to the values input from the keyboard of the control device 10 as necessary. It is set to 41. Regarding the color or the gradation, the gradation selection switch 81 and the color selection switch 82 are switched manually for each step or by a key input of the control device 10.

[0010]

According to the above conventional structure, the switch S ₁ is changed every time the type of the CRT display device is changed.
Must be switched to to S _6, further setpoint by the controller 10 in each step (frequency, address of the character generator 22 for reading the specific pattern, the horizontal ROM 32, the address of the vertical ROM42, etc.) necessary to switch the If there is an error in the operation of switching the set value, there is a risk that the defective product will be shipped.

The present invention has been proposed in view of the above-mentioned conventional circumstances, and provides a test pattern generator which does not require at least switching of switches according to the model of the CRT display device to be tested. The purpose is. Furthermore, it is another object of the present invention to provide a pattern generator that automatically switches switches in each test process.

[0012]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
The present invention employs the following means. That is, an example
For example, as shown in FIG.₁, 12_Two, 1
2_Three) And the clock driver 11
The oscillator 10 and the character generator 22 (22₁,
22_Two, 22_Three) And the video RAM 21
The generator 20 and the frequency division value for the clock signal are stored.
Horizontal ROM 32 (32₁, 32_Two, 32 _Three) And the division value
Horizontal sync signal generation consisting of horizontal counter 31 for counting
Section 30 and a vertical storing the division value for the clock signal
ROM 42 (42₁, 42_Two, 42_Three) And the frequency division value
Vertical synchronizing signal generator 4 including a vertical counter 41
0, and further, the video obtained from the pattern generator 20.
The horizontal sync signal generator 30 and the vertical sync signal.
Horizontal synchronization signal and vertical synchronization output from the signal generator 40
Display for input to CRT display device based on signal
Driver 50 (50 ₁, 50_Two, 50_Three) And gradation selection
Of a CRT display device to be tested and equipped with
According to the standard, the oscillator 12, character generator
Data 22, horizontal ROM 32 and vertical ROM 42, display
B. Test pattern for which it is necessary to select the driver 50
In the generator, the CRT display device of the specified standard
The oscillator 12, character generator 22,
Horizontal ROM 32, vertical ROM 42, display dry
Integral unit 100 by incorporating the bar 50
And clock that does not depend on the standard of the CRT display device
Driver 11, video RAM 21, horizontal counter 31,
The vertical counter 41 and the gradation selector 80 can be replaced with another unit.
The standard unit 200 is built by incorporating the
Connect the knit 100 and standard unit 200 to the connector 70
It is configured to be connected through.

[0013]

The individual support unit 100 is prepared according to the model of the CRT display device.
By connecting 00 to the standard unit 200, the oscillator 12 is used as the clock driver 11, the character generator 22 is used as the video RAM 21, and the horizontal ROM 3 is used.
2. The oscillator 10, the pattern generator 20, the horizontal sync signal generator 30, and the vertical sync signal generator 40 are formed by connecting the vertical ROM 42 to the horizontal counter 21 and the vertical counter 31, respectively. The horizontal synchronizing signal, the vertical synchronizing signal, and the color signal are input to the display driver 50. As a result, it is possible to obtain horizontal and vertical synchronization signals and image data corresponding to the model of the display device, and to reduce misalignment.

Furthermore, by automatically switching the switches in each test step by programming, the frequency and gradation designation work in each process becomes unnecessary, and no defective products are produced.

[0015]

FIG. 1 is a block diagram showing an embodiment of the present invention. Oscillator 12 ₁ , character generator 2
2 ₁ , a horizontal ROM 32 ₁ , a vertical ROM 42 _{1, a} display driver 50 ₁ and a connector IF ₁ are attached to one board to form a personalized unit 100.

On the other hand, the clock driver 11, the video RAM 21, the horizontal counter 31, the vertical counter 41, and the gradation selector 80 are set on another substrate, and the output of the clock driver 11 is the video RAM 21, the horizontal counter 31, and the vertical counter 41. Typed in standard unit 2
00 is formed. The standard unit 200 and the individual correspondence unit 100 are connected via a connector 70,
The output of the oscillator 12 ₁ is input to the clock driver 11, and the output of the character generator 22 ₁ is the video RA.
Input to M21, and further horizontal and vertical ROM 32 ₁ , 42
₁ is input to the horizontal and vertical counters 31 and 41, respectively. As a result, the video signal output from the video RAM 21 in synchronization with the clock signal is output, and
C tested from horizontal and vertical counters 31 and 41
Horizontal and vertical synchronizing signals conforming to the standard of the RT display device are obtained, and these three signals are the display connector 70.
Is input to the display driver 50 ₁ on the side of the individual correspondence unit 100 via the CRT via the connector IF _1.
It is designed to be input to the display device. The oscillator 12 ₂ (12 ₃ ) and the character generator 22
₂ (22 _3), the horizontal ROM 32 ₂ (32 _3), a vertical RO
Of course, another personalized unit 100 is made with M42 ₂ (42 ₃ ).

This makes it possible to select the individual corresponding unit 100 according to the standard and display an appropriate pattern on the CRT display device. However, in the above configuration, 1
Oscillator 12 at each step in the test of one CRT display device
The frequency setting is manually performed from the keyboard of the control device 10 shown in FIG. 3 as in the conventional case.
By incorporating the sequence for automatically performing the procedure as shown in the above into the control device 10 as a program, the setting operation in each step becomes unnecessary.

For example, as shown in FIG. 1, the step switch 310 and the control device 300 are made to interlock with each other, and as shown in FIG. 2, one step from the frequency setting F1 to the adjustment confirmation work F5 ( (See FIG. 5 for details) Each time the step switch 310 is turned on (F6)
Then, the control device 300 operates the switching driver 320 for switching the setting of the frequency, the display pattern, etc., so that the frequency etc. required in the next step (steps F1 to F5) are automatically set. In this way, each time the step switch 310 is pressed, the process advances to a new step, and when the work is completed, the stop button (not shown) is turned on to end the process (step F7).

In FIG. 1, the individual correspondence unit 100 and the standard unit 200 are separated, and the control device 300 is further provided with an automation program. However, the control device 10 is provided with the automation program in a configuration capable of supporting all models. You may let me. In this case, it is necessary to add the function of switching the switches S _{1 to} S ₆ to the switching driver 320. With this configuration, the control device 300 is first provided with a CRT.
Setting the model of the display device, the switch S ₁ to S ₆ in accordance with the model is automatically set, the oscillation unit 10 corresponding to the model, the pattern generating section 20, a horizontal, vertical synchronizing signal generator 30, 40, and the driver 50 and the connector IF are also set. After that, the same steps as shown in FIG. 3 are performed.

With the configuration and procedure described above, it is possible to automatically perform the switch operation conforming to the standard,
No misalignment will occur.

[0021]

As described above, according to the present invention, the individual unit that changes corresponding to the standard of the CRT display device to be tested of the pattern generator and the standard unit common to each individual unit are separated. Since the individual correspondence unit is selected according to the CRT display device to be tested, there is an advantage that no switch operation is required and that adjustment failure does not occur.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a flowchart of one embodiment of the present invention.

FIG. 3 is a block diagram of a conventional example.

FIG. 4 is a block diagram of a conventional example.

FIG. 5 is a flowchart showing a conventional procedure.

[Explanation of symbols]

10 oscillation unit 11 a clock driver 12 (12 _1, 12 _2, 12 ₃₎ oscillator 20 pattern generating section 21 the video RAM 22 (22 _1, 22 _2, 22 ₃₎ character generator 30 horizontal sync signal generator 31 horizontal counter 32 (32 ₁ , 32 ₂ , 32 ₃ ) Horizontal ROM 40 Vertical sync signal generator 41 Vertical counter 42 (42 ₁ , 42 ₂ , 42 ₃ ) Vertical ROM 50 (50 ₁ , 50 ₂ , 50 ₃ ) Display driver 70 Connector 80 gradation Selector 100 Individual support unit 200 Standard unit

Claims (1)

(57) [Claims] 1. A clock signal oscillator (10) comprising an oscillator (12:12 ₁ , 12 ₂ , 12 ₃ ) and a clock driver (11), and a character generator (22:22 ₁ , 22 ₂ , 22 _3). ) And video RAM
(21) a pattern generator (20), a horizontal ROM (32:32 ₁ , 32 ₂ , 32 ₃ ) storing frequency division values for clock signals, and a horizontal counter (31) for counting the frequency division values A horizontal synchronization signal generator (30), a vertical ROM (42:42 ₁ , 42 ₂ , 42 ₃ ) that stores frequency division values for clock signals, and a vertical counter (41) that counts the frequency division values. Vertical sync signal generator consisting of (40)
And further, based on the horizontal synchronizing signal and the vertical synchronizing signal output from the horizontal synchronizing signal generating unit (30) and the vertical synchronizing signal generating unit (40), the video signal obtained from the pattern generating unit (20). Display driver (50:50 ₁ , 50 ₂ , 50 ₃ ) input to CRT display device to be tested, and gradation selector
In addition, the oscillator (12) and the character generator (2) provided with the (80) are compatible with the standard of the CRT display device under test.
2), a horizontal ROM (32), a vertical ROM (42), and a test pattern generator that requires selection of a display driver (50), the oscillator (12) corresponding to a specified standard CRT display device,
Character generator (22), horizontal ROM (32) and vertical R
A clock driver (1) that does not depend on the standard of the CRT display device is constructed by incorporating the OM (42) and the display driver (50) into the unit to form a personalized unit (100).
1), a video RAM (21), a horizontal counter (31), a vertical counter (41) and a gradation selector (80) are incorporated in another unit to form a standard unit (200), and the individual corresponding unit (100) The test pattern generator is characterized in that the standard unit (200) and the standard unit (200) are connected via the connector (70).