CN104539940A - Display signal test fixture and test method - Google Patents

Abstract

The invention discloses a display signal test fixture and a test method, which are suitable for connecting a display signal generating device with a plurality of display ports and an analysis host, wherein each display port is respectively used for outputting a display signal. The display signal testing tool comprises a main control circuit board, a switcher and an image capturing unit. The main control circuit board is electrically connected with the analysis host and the display signal generating device; the switcher is electrically connected with each display port of the display signal generating device and the main control circuit board and is provided with a plurality of switching circuits for transmitting display signals; the image capturing unit is electrically connected with the switcher and the main control circuit board, wherein the image capturing unit receives the display signal transmitted by the switching circuit and transmits the display signal to the analysis host. The display signal testing jig can automatically detect whether the output of each display port is normal or not, and human eyes do not need to inspect the display state on the display equipment one by one.

Description

Display signal test fixture and test method

technical field

The present invention relates to a display signal test fixture and test method, which are suitable for a display signal generating device and an analysis host, and particularly relate to an analysis host to perform tests for switching multiple switches to transmit display signals, for use in To analyze whether the electrical properties of the display signal generating device and the display interface are normal, and to improve the test coverage.

Background technique

Nowadays, with the introduction of diversified image output products, such as the digitalization of TV, the advent of high-definition images of Blu-ray players and 4K TV sets, and the popularization of personal mobile devices such as mobile phones and tablet computers, consumers are pursuing convenience and high-quality images. In the context of audio-visual entertainment, traditionally there is no clear boundary between consumer usage scenarios and habits, resulting in a sharp increase in the demand for image output products that can be used across interfaces and platforms and maintain good performance; screen, or a personal computer connected to a set-top box for viewing, or a mobile phone, tablet computer, and video recorder connected to a TV for viewing, etc., and the display adapter of a personal computer is a product representative of multiple audio-visual format interfaces.

Therefore, currently video output products have many audio-visual format interfaces, and the test for a single audio-visual format interface can no longer meet the needs of market usage scenarios. With the diversification of software, hardware, and firmware formats, if the display signal generating device is not available After a complete set of efficiency tests, subsequent consumers may easily encounter some problems and flaws in different usage scenarios. Therefore, in order to ensure the quality of video output products and prevent defective products from entering the market, manufacturers usually conduct quality control and testing on the interface appearance of video output products, each port, and various audio and video formats of display adapters before the video output products leave the factory. .

In the general video output product testing process, testers usually check with the naked eye whether the phase, color scale, and color saturation of the images presented by different display interfaces of the video output product meet the standards. Furthermore, manually testing each item item by item is not only time-consuming and labor-intensive , and easily lead to missing or flawed tests. In addition, for different audio-visual format interfaces, it is obviously the most direct test method to use a single corresponding receiving audio-visual format interface for its output audio-visual format interface, but it is time-consuming and labor-intensive and inefficient; so the back-end receiving analysis It is a better test system and method if the compared unit can receive or switch more output audio-visual format interfaces.

In order to achieve effective testing, it is necessary to discuss a test coverage rate, which is based on the fact that each execution path or action in the system should be included in the test target, and then the test case is used to analyze whether these so-called test activities have achieved the target including the target to be tested. How many percentages, and can be combined with different methods such as so-called black box testing, user testing, and compatibility testing. Therefore, when judging the status of the display signal generating device, improving the test coverage is an important reference pointer. It can display the current coverage of various interfaces and transmission audio and video formats tested by the display signal generating device. The display signal generating devices can achieve 100% test coverage.

Contents of the invention

In view of the above problems, the present invention proposes a display signal test fixture and test method suitable for a display signal generating device and an analysis host, which can obtain the output of each display port on the display adapter one by one by switching lines for the analysis host Automatic comparison, no need for human eyes to check the display status on the display device one by one.

To achieve the above purpose, the present invention discloses a display signal test fixture, which is suitable for connecting a display signal generating device with a plurality of display ports and an analysis host, wherein each display port is used to output a display signal respectively. The display signal test fixture includes a main control circuit board, a switcher and an image capture unit. The main control circuit board is electrically connected to the analysis host and the display signal generating device to generate a driving signal to drive the display signal generating device to generate display signals; the switcher is electrically connected to each display port of the display signal generating device and the main control circuit board , the switcher has a plurality of switching lines for transmitting display signals, the switcher has a plurality of switching lines for transmitting display signals; the image capture unit is electrically connected to the switcher and the main control circuit board, wherein the image capture unit receives The display signal transmitted by the switching line is sent to the analysis host. The analysis host can analyze whether the signals output by each display port are normal by comparing the test images.

In at least one embodiment of the present invention, the switcher includes a plurality of signal input ports and a plurality of signal output ports, the signal input port is connected to the display port of the display signal generating device, and the switching circuit switches each output port connected to one of the signal output ports One, and at least one of the signal output ports is connected to the image capture unit.

In at least one embodiment of the present invention, the image capture unit has a plurality of capture ports, which are respectively connected to one of the signal output ports.

In at least one embodiment of the present invention, each signal input port is D-SUB, DVI, HDMI, DisplayPort, S terminal, AV terminal, component terminal or HDTV video format terminal.

In at least one embodiment of the present invention, each signal output port is D-SUB, DVI, HDMI, DisplayPort, S terminal, AV terminal, component terminal or HDTV video format terminal.

In at least one embodiment of the present invention, each capture port is D-SUB, DVI, HDMI, DisplayPort, S-video, AV, component or HDTV audio-video format.

In at least one embodiment of the present invention, the display signal test fixture further includes a display device connected to one of the capture ports.

In at least one embodiment of the invention, the display signal is a test image.

The present invention also discloses a display signal testing method for testing a plurality of display ports of a display signal generating device. The display signal testing method includes the following steps:

generating a driving signal according to a test image to drive the display signal generating device to generate a plurality of display signals;

A switcher is electrically connected to each display port of the display signal generating device, wherein the switcher has a plurality of switching lines for transmitting display signals;

At least one of the display ports is electrically connected to an image capture unit by switching a switching line;

Using the image capture unit to receive the display signal transmitted by the switching circuit and send it to an analysis host; and

To analyze the host computer to analyze the difference of display signal and test image.

In at least one embodiment of the present invention, the step of analyzing the host computer to analyze the difference between the display signal and the test image includes:

Analyzing the coordinate values and three primary color values of the images in each display signal and test image with the analysis host; and

If the coordinate values of the image in each display signal and the test image and the values of the three primary colors are consistent, it is judged that the display module of the display signal generating device is normal; The display module of the device is abnormal.

In at least one embodiment of the present invention, the step of analyzing the host to analyze the difference between the display signal and the test image includes:

The image capture unit continuously captures each display signal and sends it to the analysis host;

Analyzing the overlapping display signals of the host computer, and analyzing whether the display signals and test images overlap; and

If the display signals and the test images are completely overlapped, it is judged that the display module of the display signal generating device is normal; if the display signals and the test images are not completely overlapped, it is judged that the display module of the display signal generating device is abnormal.

In at least one embodiment of the present invention, the step of analyzing the host to analyze the difference between the display signal and the test image includes:

sending a control signal to the display signal generating device by the analysis host;

The graphics card under test correspondingly adjusts the voltage to the full-load state according to the control signal, and correspondingly sends back the display signal to generate a current information of the device in the full-load state;

Analyzing the host to compare current information and analyzing the host to store a current tolerance value corresponding to the display signal generating device; and

If the current information does not reach a current tolerance value, it is judged that the electrical terminal of the display signal generating device is normal; if the current information exceeds a current tolerance value, it is judged that the electrical terminal of the display signal generating device is abnormal.

The display signal test fixture and test method of the present invention are suitable for testing all display interface products with multiple display ports, and can be replaced with higher-resolution test images to increase the number of display signals with higher resolution. Display the test coverage rate of the signal generating device, and the test program can automatically switch the transmission/transmission port in the above system, without being affected by ambient light pollution and eliminating the test results of personnel omission and environmental influence, and then achieve one person with multiple machines or fully automatic Displays the advantages of signal generation device testing, etc.

The features, implementation and effects of the present invention will be described in detail as follows with reference to the best embodiments in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a system block diagram of a display signal test fixture according to an embodiment of the present invention;

2 is a schematic diagram of a display signal test fixture according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a multiple switcher according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a switching circuit according to an embodiment of the present invention;

5 is a flowchart of a display signal testing method according to an embodiment of the present invention;

Fig. 6 is a flow chart of steps for analyzing and displaying signals by the analysis host in an embodiment of the present invention;

Fig. 7 is another embodiment of the present invention, a flow chart of steps for analyzing and displaying signals by the analysis host;

FIG. 8 is a flow chart of steps for displaying whether the display interface and electrical terminals of the signal generating device are abnormal in an embodiment of the present invention.

Explanation of reference signs

10 Display signal generating device

100 DisplayPort

11 Analysis Host

12 display device

20 Display signal test fixture

200 main control circuit board

200a Expansion slot

201 Unit 1

202 Second Unit

203 The third unit

210 Switcher

211 The first interface

212 Second interface

213 The third interface

215 switch line

216 Signal input port

218 Signal output port

220 image capture unit.

Detailed ways

Referring to FIG. 1 , the first embodiment of the present invention discloses a display signal test fixture 20 . The display signal generating device 10 is electrically connected to the display signal test fixture 20 , and the display signal test fixture 20 is electrically connected to an analysis host 11 for testing whether the display signal output of the display signal generating device 10 is normal.

The display signal generating device 10 can be a device with an output image such as a personal computer, a notebook computer, a mobile phone, a tablet computer, a set-top box, a DVD player, a Blu-ray player, a camcorder, and a video game console, or it can be a single display adapter.

As shown in FIG. 1 , the display signal generating device 10 has a plurality of display ports 100 for outputting a display signal respectively. These display ports 100 may be a combination of output interfaces of different specifications, including interfaces of digital and analog video and audio format terminals. In a specific application example of the present invention, the display signal generating device 10 is a display adapter, and the display signal generating device 10 has an HDMI port, a DVI-D port, a DVI-I (DVI-D) port, a DVI-I (DVI- A) The port is a combination of DisplayPort 100, but not limited thereto.

Please refer to FIG. 2 , the display signal test fixture 20 includes a main control circuit board 200 , a switcher 210 and an image capture unit 220 .

As shown in FIG. 2 , the main control circuit board 200 is electrically connected to the analysis host 11 . In the case where the display signal generating device 10 is a display adapter, the main control circuit board 200 is a main board, and has an expansion slot 200a, and the expansion slot 200a is used to connect the display signal generating device 10, so that the main control circuit board 200 generates a drive signal The display signal generating device 10 is caused to generate a display signal. The mainboard is a mainboard commonly used in PC (Personal Computer), and the aforementioned expansion slot 200a is a display adapter slot. In addition to the display adapter slot, the main control circuit board 200 also includes other necessary components that constitute the PC main control circuit board 200 and enable the main control circuit board 200 to perform PC functions. Each of the necessary elements can be completed by a person with ordinary knowledge based on the common knowledge in this field, and is not the characteristic technical means of the present invention, and the details thereof will not be repeated here.

When the display signal generating device 10 is an independent electronic device, the display signal generating device 10 is connected to the main control circuit board 200 through an interface conforming to a specific communication protocol to receive a driving signal to generate a display signal.

The switcher 210 is electrically connected to each display port 100 of the display signal generating device 10 and the main control circuit board 200 respectively. The switcher 210 has a plurality of switching lines 215, and each switching line 215 is used for transmitting display signals.

The switcher 210 includes a plurality of signal input ports 216 and a plurality of signal output ports 218 , and the signal input ports 216 are connected to the display port 100 of the display signal generating device 10 . By being operated independently or under the control of the main control circuit board 200, the switching circuit 215 of the switcher 210 switches each signal input port 216 to be connected to one of the signal output ports 218, and at least one of the signal output ports 218 is connected to the image The capture unit 220 .

Similarly, the specification of the signal input port 216 is D-SUB, DVI, HDMI, DisplayPort, S-Video, AV-Video, component or HDTV audio-video format, so as to cooperate with different DisplayPorts 100 respectively. The signal output port 218 is D-SUB, DVI, HDMI, DisplayPort, S terminal, AV terminal, component terminal or HDTV video format terminal, and is connected to the signal input port 216 with matching specifications through the switching line 215 .

The image capture unit 220 is electrically connected to the switcher 210 and the main control circuit board 200 . The image capture unit 220 has a plurality of capture ports 222 which are respectively connected to one of the signal output ports 218 . In the case where the main control circuit board 200 is a main board, the image capture unit 220 is an image capture card disposed on the main board.

By switching the switching line 215, each capture port 222 of the image capture unit 220 can receive a display signal output from a corresponding display port 100, and transmit it to the analysis host 11 for the analysis host 11 to analyze the display port 100. Whether the output display signal is normal.

Please refer to FIG. 3 in the second embodiment, the switch circuit 215 can be a multiple signal conversion circuit, the switch circuit 215 includes a first interface 211, a second interface 212 and a third interface 213, and forms a multiple signal Converts the line transmission and converts the display signal.

The display signal is transmitted from the display signal generating device 10 to the first unit 201, and then, the first unit 201 can convert the display signal into another specification, or directly bypass the display signal, and pass a first The interface 211 transmits to the second unit 202 . Among them, the first unit 201 and the plurality of display ports 100 of the display signal generating device 10 are connected by a plurality of signal input ports 216, and the first interface 211 is connected between the first unit 201 and the second unit 202. Similarly, the second unit 202 can be enabled to convert the display signal to another specification again, or directly bypass (by pass) the display signal, and pass through a second interface 212 transmitted to the third unit 203. Wherein the second interface 212 is formed by a plurality of connection terminals corresponding to each other between the third unit 203 and the second unit 202; finally, the third unit 203 is transmitted to the image capture unit 220 through the third interface 213 to capture the corresponding specifications. The third interface 213 is composed of a plurality of signal output ports 218 between the third unit 203 and the image capture unit 220 .

As mentioned above, in the first unit 201 , the second unit 202 and the third unit 203 , the display signal can be converted to other transmission standards, or the original transmission standard can be maintained to match the capture port 222 of the image capture unit 220 Specification.

Please refer to Fig. 4, the first unit 201 can convert and output the first display signal 2011, the second unit 202 can convert and output the second display signal 2012 and the third unit 203 can convert and output the third display signal 2013; through the first unit 201 , the second unit 202 and the third unit 203 form a multiple signal conversion circuit, so that the final output display signal specification is the first display signal 2011 , the second display signal 2012 or the third display signal 2013 . The first display signal 2011 , the second display signal 2012 and the third display signal 2013 conform to one of D-SUB, DVI, HDMI, DisplayPort, S-Video, AV-Video, Component or HDTV formats.

Please refer to Fig. 1, a test image (Test Pattern) is stored in the analysis host 11, wherein the display signal generating device 10 transmits the display signal of the above-mentioned test image, and the display signal passes through the display signal test fixture 20 to transmit the display signal and Analysis host 11. In addition, the display signal output by the switcher 210 can also be directly output to a display device 12, so as to provide the tester with a noticeable view. Please refer to FIG. 1, in the disclosed embodiment of the present invention, the number of image capture units 220 is not limited to one group. If you want to improve the test efficiency, you can set multiple groups of display image capture units 220 at the same time. , that is, one person with multiple machines to increase test capacity. Further, the display signal of a test image with a higher resolution can be replaced, and then a high-resolution image can be measured to increase the test coverage.

As mentioned above, please refer to Figures 1 and 2, the analysis host 11 can execute a test program to control the single switcher 210, and the test program is a design test, including: whether the display signal generating device 10 is operating normally or not Drive the switcher 210 for the display signal transmission, so that the display port 100 on each standby side is connected to the corresponding capture port 222, so that the image capture unit 220 captures the display signal 100 for the analysis host 11 to display the signal It is used for checking or comparing the display port 100 of the generating device 10 .

Please refer to FIG. 5 , together with reference to FIGS. 1 to 4 , the third embodiment of the present invention discloses a display signal testing method for testing a plurality of display ports 100 of a display signal generating device 10 .

As shown in the figure, first, a display signal generating device 10 is provided (S301), and the display signal generating device 10 is electrically connected to a main control circuit board 200 (S302). The main control circuit board 200 has an expansion slot 200 a for connecting the display signal generating device 10 to the main control circuit board 200 to receive the driving signal from the main control circuit board 200 . When the display signal generating device 10 is a display adapter, the expansion slot 200a is used for inserting the display adapter. In the case where the display signal generating device 10 is an independent electronic device, the expansion slot 200a is an interface conforming to a specific communication protocol for the display signal generating device 10 to be connected to the main control circuit board 200 through a specific communication protocol to receive the drive signal to generate Show signal.

The main control circuit board 200 generates a driving signal according to a test image, causing the display signal generating device 10 to generate a plurality of display signals (S303), which are used to transmit to different display ports 100 respectively, so that each display port of the display signal generating device 10 100 outputs display signals of various video and audio formats respectively.

In a specific application example of the present invention, the display port 100 of the display signal generating device 10 can respectively output a combination of audio and video formats of HDMI, DVI-D, DVI-I (DVI-D) and DVI-I (DVI-A). .

A switcher 210 is electrically connected to each display port 100 of the display signal generating device 10 (S304), wherein the switcher 210 has a plurality of switching lines 215 for transmitting display signals. The switcher 210 can be operated independently or controlled by the main control circuit board 200 , so that the switcher 215 switches each signal input port 216 to be connected to one of the signal output ports 218 .

Next, at least one of the display ports 100 is electrically connected to an image capture unit 220 by switching the switching line 215 ( S305 ). For example, the signal input port 216 of the HDMI audio-video format terminal is switched through the switching line 215 to connect to the signal output port 218 of the DVI audio-video format terminal. For another example, the signal input port 216 of the AV terminal is switched by the switch circuit 215 to connect to the signal output port 218 of the D-SUB video format terminal.

Finally, the display signal transmitted by the switching line 215 is received by the image capture unit 220 and sent to an analysis host 11 (S306), and then the analysis host 11 is used to analyze the difference between the display signal and the test image to determine the display signal generating device 10 shows whether the module is abnormal (S310), and finally outputs the judgment result.

As shown in Figure 6, in a specific embodiment, the step of analyzing the display signal by the analysis host 11 (S310) includes analyzing the coordinate values and the three primary color values of the images in each display signal and test image by the analysis host 11 (S311); Whether the coordinate values and the three primary color values of the image in the display signal and the test image are consistent (S312); if the coordinate values and the three primary color values of the image in each display signal and test image are consistent, then it is judged that the display module of the display signal generating device 10 is normal (S313) ; If the coordinate values of the image in each display signal and the test image and the values of the three primary colors are inconsistent, it is determined that the display module of the display signal generating device 10 is abnormal (S314).

As shown in FIG. 7, in another specific embodiment, the step of analyzing the display signal by the analysis host 11 (S310) includes using the image capture unit 220 to continuously capture each display signal and send it to the analysis host 11 (S315); 11 Superimposing each display signal, and analyzing whether the display signal and the test image overlap (S316). If each display signal and the test image are completely overlapped, then it is judged that the display module of the display signal generating device 10 is normal (S317); if each display signal and the test image are not completely overlapped, then it is judged that the display module of the display signal generating device 10 is abnormal ( S318).

As shown in FIG. 5 and FIG. 8, before analyzing the host 11 to analyze the difference between the display signal and the test image, the following steps may be included to determine whether the display interface and the electrical terminal of the display signal generating device 10 are abnormal, The steps include: sending a control signal to the display signal generating device 10 through the analysis host 11 (S321); the graphics card to be tested correspondingly adjusts the voltage to the full-load state according to the control signal, and correspondingly returns a current of the display signal generating device 10 in the full-load state Information (S322); the analysis host 11 compares the current information and the analysis host 11 stores a current tolerance value corresponding to the display signal generating device 10, so as to analyze whether the current information reaches a current tolerance value (S323).

If the current information does not reach the current tolerance value, it is judged that the electrical terminals of the display signal generating device 10 are normal (S324); if the current information exceeds a current tolerance value, it is judged that the electrical terminals of the display signal generating device 10 are abnormal (S325).

The display signal test fixture and test method of the present invention are suitable for testing all display interface products equipped with multiple display ports 100, and can be replaced with higher-resolution test images, which can be displayed by higher-resolution display signals Increase the test coverage rate of the display signal generating device 10, and the test program can automatically switch the transmission/transmission ports in the above-mentioned system, without being affected by ambient light pollution and eliminating the test results of personnel omission and environmental impact, and then achieve one person with multiple machines or all Automatic display signal generating device 10 test and other advantages.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention.

Claims (12)

1. a display measurement jig, be applicable to display generation device and an analysis main frame that connection one has a plurality of display port, wherein respectively this display port is respectively used to output one display; It is characterized in that, this display measurement jig comprises:

One main control board, is electrically connected this analysis main frame and this display generation device, produces display in order to produce a drive singal to drive this display generation device;

One switch, be electrically connected respectively this display port and this main control board of this display generation device, this switch has a plurality of circuit switched for transmitting display signal therefor; And

One image acquisition unit, is electrically connected this switch and this main control board, and wherein, this image acquisition unit receives this display that this circuit switched is transmitted, and is sent to this analysis main frame.

2. display measurement jig as claimed in claim 1, it is characterized in that, this switch comprises a plurality of signal input port and a plurality of signal output port, respectively this signal input port is connected to this display port of this display generation device, this circuit switched switch be connected to respectively this signal output port one of them, and respectively have at least one to be connected to this image acquisition unit among this signal output port.

3. display measurement jig as claimed in claim 2, it is characterized in that, this image acquisition unit has a plurality of acquisition port, be connected to respectively respectively this signal output port one of them.

4. display measurement jig as claimed in claim 2, it is characterized in that, respectively this signal input port is D-SUB, DVI, HDMI, DisplayPort, S terminal, AV terminal, aberration terminal or HDTV audio-visual format terminal.

5. display measurement jig as claimed in claim 2, it is characterized in that, respectively this signal output port is D-SUB, DVI, HDMI, DisplayPort, S terminal, AV terminal, aberration terminal or HDTV audio-visual format terminal.

6. display measurement jig as claimed in claim 3, it is characterized in that, respectively this acquisition port is D-SUB, DVI, HDMI, DisplayPort, S terminal, AV terminal, aberration terminal or HDTV audio-visual format terminal.

7. display measurement jig as claimed in claim 3, is characterized in that, more comprise a display device, be connected to respectively this acquisition port one of them.

8. display measurement jig as claimed in claim 1, it is characterized in that, this display is test pattern.

9. a display method of testing, is characterized in that, for testing a plurality of display ports of a display generation device, this display method of testing comprises the following steps:

A drive singal is produced, to drive this display generation device to produce a plurality of display according to a test pattern;

Be electrically connected respectively this display port of this display generation device with a switch, wherein this switch has a plurality of circuit switched for transmitting display signal therefor;

With this circuit switched switch this display port at least one of them is electrically connected at an image acquisition unit;

Receive with this image acquisition unit this display that this circuit switched transmits, be sent to an analysis main frame; And

With this analysis main frame to analyze the difference of this display and this test pattern.

10. display method of testing as claimed in claim 9, it is characterized in that, the step of the difference of this this display of analysis host analysis and this test pattern comprises:

With the coordinate figure of image in this analysis host analysis respectively this display and this test pattern and three primary colors numerical value; And

If respectively in this display and this test pattern the coordinate figure of image and three primary colors numerical value consistent, then judge that the display module of this display generation device is normal; If respectively in this display and this test pattern the coordinate figure of image and three primary colors numerical value inconsistent, then judge that the display module of this display generation device is abnormal.

11. display method of testings as claimed in claim 9, it is characterized in that, this analysis main frame comprises with the step of the difference analyzing this display and this test pattern:

This image acquisition unit captures respectively this display continuously and is sent to this analysis main frame;

Superimposed respectively this display of this analysis main frame, and analyze this display and whether this test pattern is overlapping; And

If respectively completely overlapping in this display and this test pattern, then judge that the display module of this display generation device is normal; If respectively not exclusively overlapping in this display and this test pattern, then judge that the display module of this display generation device is abnormal.

12. display method of testings as claimed in claim 9, it is characterized in that, this analysis main frame comprises with the step of the difference analyzing this display and this test pattern:

Transmit one with this analysis main frame and control signal to this display generation device;

This video card to be measured adjusts voltage to full load condition according to this control signal correspondence, and corresponding this display generation device of passback is in a current information of full load condition;

This this current information of analysis main frame comparison and this analysis main frame store should an electric current tolerance value of display generation device; And

If this current information does not reach an electric current tolerance value, then judge that the electric terminal of this display generation device is normal; If this current information is more than an electric current tolerance value, then judge that the electric terminal of this display generation device is abnormal.