KR20140005466A - Method and device for image testing of the display panel - Google Patents

Method and device for image testing of the display panel Download PDF

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Publication number
KR20140005466A
KR20140005466A KR1020120072709A KR20120072709A KR20140005466A KR 20140005466 A KR20140005466 A KR 20140005466A KR 1020120072709 A KR1020120072709 A KR 1020120072709A KR 20120072709 A KR20120072709 A KR 20120072709A KR 20140005466 A KR20140005466 A KR 20140005466A
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South Korea
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image
signal
display panel
image quality
unit
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KR1020120072709A
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Korean (ko)
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김정수
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(주)큐랩스
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)

Abstract

The present invention relates to an image quality inspection apparatus of a display panel, and includes a GVIF (Gigabit Video InterFace) module and a Low Voltage Differential Signaling (LVDS) module in the image quality inspection apparatus itself to check whether there is an abnormality of the display panel before assembly or completion of the display panel. The apparatus may include a key input unit configured to control an image signal output method according to a user's selection, a key input unit for receiving a selection of an image quality test image and an image output method, and an image output method for selecting an image selected by a signal of the key input unit. And a control unit for controlling the display panel to be provided to the display panel, a screen for selecting the image provided to the display panel and the image output method, and a display unit for displaying the selected output image. An image signal providing unit providing an inspection image Is determined, in accordance with the signal inputted from the key input section provides an image provided by the image providing the signal to LVDS or GVIF module part module.
Therefore, it is not necessary to connect the cable for connecting the external pattern generator to the image inspection apparatus of the display panel, and the image can be accurately inspected by reducing the noise of the image signal according to the cable connection. It can be applied not only to the laboratory, but also to the quality inspection, reliability testing department, and the entire inspection of the production line, thereby improving the quality of the display panel and reducing the test cost, thereby increasing production efficiency.

Description

Image quality test apparatus and method thereof for display panel {Method and device for image testing of the display panel}

The present invention relates to an apparatus and a method for inspecting an image quality of a display panel. More particularly, a Gigabit Video InterFace (GVIF) module and a Low Voltage Differential Signaling (LVDS) module are included in the image quality inspection device itself for checking an abnormality of the display panel. The present invention relates to an image quality inspection apparatus for a display panel and a method for converting and outputting an image signal required for inspection of the display panel without being connected to another device such as an external evaluation pattern generator.

Display panels are used in various electronics and computer products, such as portable televisions, mobile telephones, camcorders, navigation, notebook computers, desktop computers, and projection televisions.

Such display panels require a process of checking whether a screen is normally displayed in a production process, and an image quality inspection apparatus is used for such an inspection process.

1 is a diagram illustrating an image quality inspection apparatus for a flat panel display panel.

In order to drive the flat panel display panel 200 using the image quality inspection apparatus 100 (pattern generator), a horizontal synchronous signal (H-sync), a vertical synchronous signal (V-sync), a data enable signal (DE), and a clock signal (CLK) and R / G / B data (Data), which is image data, transmit a TTL signal having a high frequency to a timing controller provided in the flat panel display panel 200.

Thereafter, the image quality of the displayed image is evaluated to optimize the signal values for driving the flat panel display panel.

However, such a TTL (Transistor Transistor Logic) signal type image quality inspection device (test pattern generator) transmits data as a TTL signal having a high frequency, so that the image signal is affected by the TTL signal and the voltage level changes at the corresponding frequency. Therefore, EMI (Electro Magnetic Interference) problem occurs.

In addition, a method of transmitting data or clock signals in a TTL signal requires a large number of transmission lines, and thus requires a large number of cables and connectors configured in the flat panel display panel. In such an environment, data or clock signals are directly or indirectly affected by noise, and when normal data and clock signals are affected by noise, a problem occurs in abnormally forming a screen.

In order to solve this problem, a method of providing a signal provided to a flat panel display panel as a low voltage differential signal (LVDS) during an image quality inspection has been introduced. LVDS technology was defined in IEEE P 1596.3 in 1996 by the Institute of Electrical and Electronics Engineers (IEEE). LVDS technology is designed to realize low-voltage data transmission, and has a high transmission speed.

FIG. 2 illustrates a method in which an image quality inspection device providing an LVDS signal receives an image signal, wherein a TTL signal, which is an image signal, is input to a field programmable gate array (FPGA) and is connected to the flat panel display panel 200 through the LVDS 130. Is provided.

The video signal including the horizontal synchronization signal (H-sync), the vertical synchronization signal (V-sync), the data enable signal (DE), the clock signal (CLK), and the R / G / B data, which is image data, is controlled externally. A high frequency TTL signal is input to the FPGA 110 of the image quality inspection device 100 through an external input device such as a PC 300 (PC).

However, the image quality inspection device 100 receives a high-frequency TTL signal from the control PC 300 through the communication processing terminal 121 through a serial cable of the RS-232 communication method, but the communication speed is slow, a large amount of video signal There is a problem that can not be delivered to the FPGA (110).

Therefore, in the case of a simple test image is received as a TTL signal through an external input device such as a control PC, but in the case of a complex test image is directly connected to the external pattern generator (100a), which is a separate image quality inspection device, and is not a TTL signal. Directly receive the LVDS signal.

As a result, the image quality inspecting apparatus 100 receives a simple video signal including an R / G / B image signal and a control signal from the control PC 300 to the FPGA 110 as a TTL signal and receives the LVDS conversion output terminal 130. The image quality test (primary inspection) of the display panel is performed by outputting through the display.

However, according to the conventional method, since the control PC and the image quality inspection apparatus use RS-232 communication using RDA, the communication speed (38400bps) is slow, and thus it takes a lot of time to transmit 5 ~ 6MB of pattern data for inspection per panel. There is a limit to the transmission of a large number of pattern data, so only simple patterns such as red, blue, and green are used.

Therefore, after performing the first test as described above, in the case of a complex large-capacity video signal such as a person or a video for the final test (LVDS wired) from an external external pattern generator (100a) from the outside Cable), it is inconvenient to perform the second inspection by receiving the LVDS signal, which is the pattern data.

In addition, such an image quality inspection apparatus is practically impossible to apply the production line, and there is a problem in that the utilization of the product is lowered because it is used only for image quality evaluation in a laboratory.

Accordingly, the present invention has been made to solve the above problems, an object of the present invention is to provide a GVIF (Gigabit Video InterFace) module and LVDS (Low Voltage Differential Signaling) in the image quality inspection device itself to check the display panel abnormality The present invention relates to an apparatus and method for inspecting image quality of a display panel having a module so that complex large-capacity video signals can be applied to inspection of the display panel without being connected to other devices such as an external evaluation pattern generator.

According to an aspect of the present invention, an apparatus for inspecting an image quality of a display panel includes a key input unit configured to receive a selection of an image quality test image and an image output method, and an image selected by a signal of the key input unit according to an output method. And a display unit for controlling the display unit to be provided to the panel, a display unit for selecting an image provided to the display panel and the image output method, and displaying a selected output image. It is connected to a video signal providing unit for providing, according to the signal input from the key input unit provides an image provided from the video signal providing unit to the GVIF module unit or LVDS module unit, and outputs to the display panel.

The image signal providing unit may be at least one of a USB, Ethernet, RS-232C, or SD card, and is connected to the image quality checking device to provide image pattern data, still images, or moving images necessary for image quality inspection.

The controller may be configured to convert the selected video signal into a GVIF signal by the GVIF module unit and convert the selected video signal into an LVDS signal according to the set video output method after the image output method is set by the key input unit. Characterized in that the output to the channel form.

In another aspect of the present invention, the image quality inspection method of the display panel according to the present invention for achieving the above object, when a power-on signal of the image quality inspection apparatus is input, the image connected to the image quality inspection apparatus by the user selection The GVIF method includes a first step of receiving a quality test image from a signal provider, a second step of selecting an output method of the quality test image provided in the first step, and an output method of the quality test image selected in the second step. When the image quality test image is provided to the GVIF module and converts the image quality test image according to the GVIF method, the output method of the image quality test image selected in the second and second steps is output to the display panel. In case of, the image quality test image is provided to the LVDS module unit and the image quality test image is converted according to the LVDS method. That consisting of a fourth step of outputting to the features.

The image quality inspection image may be output by the GVIF method or the LVDS method according to one-time output, repetitive output, or a predetermined order based on predetermined information.

At this time, the video signal providing unit is at least one of USB, Ethernet, RS-232C or SD card, and is connected to the picture quality inspection device, characterized in that to provide the image pattern data, still image or video necessary for picture quality inspection.

As described above, the effects of the image quality inspection apparatus of the display panel according to the present invention are as follows.

First, by providing a GVIF module in the image quality inspection apparatus of the display panel, there is no need for a cable connection for the connection of the external pattern generator, it is possible to reduce the noise of the video signal according to the cable connection to accurately inspect the image.

Second, the display panel's image quality inspection device can be applied not only to the product laboratory, but also to the quality inspection, reliability testing department, and the entire inspection of the production line, thereby improving the quality of the display panel and reducing the test cost, thereby increasing production efficiency. It works.

1 is a diagram illustrating an image quality inspection apparatus for a flat panel display panel;
2 is a diagram illustrating a method of receiving an image signal by an image quality inspection device providing an LVDS signal;
3 is a view showing an image quality inspection apparatus of a display panel according to the present invention;
4 is a flowchart illustrating a method of checking an image quality of a display panel according to the present invention.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a view illustrating an image quality inspection apparatus of a display panel according to the present invention, wherein the image quality inspection apparatus 10 of the display panel according to the present invention includes a key input unit 20 that receives a selection of an image quality inspection image and an image output method. And a controller 30 for controlling the image selected by the signal of the key input unit 20 to be provided to the display panel 80 according to the selected image output method, and the image and image output method provided to the display panel 80. The display unit 60 provides a selectable screen and displays a selected output image.

At this time, the control unit 30 is connected to the image signal providing unit 70 for providing the quality test image, the GVIF module unit to transmit the image transmitted from the image signal providing unit 70 according to the signal input from the key input unit 20 40 or LVDS module unit 50 is provided.

The video signal providing unit 70 is connected to at least one of the USB, Ethernet, RS-232C or SD card to the connector of the picture quality inspection device 10 of the display panel 80 to provide a picture quality inspection image.

Alternatively, the image pattern data may be transmitted and received wirelessly with the image quality checking apparatus 10.

Here, the image quality inspection image provided from the image signal providing unit 70 is provided with a standard test image pattern, a still image, or a moving image.

In addition, since the image quality test image signal provided from the image signal providing unit 70 transmits and receives a signal according to the control signal of the controller 30, the user may select an image to be used for the image quality test through the key input unit 20.

The control unit 30 provides the selected video signal to the GVIF module unit 40 or the LVDS module unit 50 according to the signal input by the key input unit 20, so that the selected video signal is transmitted by the corresponding module unit. The conversion is implemented in a multi-channel form to be output to the display panel 80.

That is, when the control unit 30 of the image quality inspection device 10 is selected through the key input unit 20 so that the image signal transmitted to the display panel 80 to be checked for image quality is transmitted by a low voltage differential signaling (LVDS) method. The image signal transmitted from the image signal providing unit 70 is provided to the LVDS module unit 50.

The image pattern data provided to the controller 30 is converted into a low voltage differential signal LVDS by the LVDS module unit 50 including a CPLD and a LVDS conversion unit, and provided to the flat panel display panel 80.

The CPLD included in the LVDS module unit 50 supplies the image pattern data received from the image signal providing unit 70 under the control of the control unit 30 to the LVDS conversion unit as a high frequency TTL signal according to the reference timing of the image signal. do.

The CPLD may be configured of a plurality of CPLDs that provide a signal to the LVDS module unit 50 when the LVDS signal is composed of multiple channels. In this case, the image quality inspection apparatus 10 may transmit the TTL signal through a field programmable gate array (FPGA), which is a programmable logic chip, but is not essential.

The LVDS conversion unit converts the TTL signal received from the CPLD into a low voltage differential signal (LVDS) and provides it to the flat panel display panel 80.

The LVDS converter may be configured in an LVDS multi-channel form in order to transmit a signal at high speed between the display panel 80 in some cases.

On the other hand, the control unit 30 of the image quality inspection device 10 by the user through the key input unit 20 so that the video signal transmitted to the display panel 80 to check the image quality is transmitted by GVIF (Gigabit Video InterFace) method When selected, the control unit 30 receives the image pattern data to be used for the image quality inspection from the image signal providing unit 70 by control.

The image pattern data provided to the controller 30 is converted into a GVIF method through the GVIF conversion unit provided in the GVIF module unit 40 and provided to the flat panel display panel 80.

In some cases, the GVIF converter may be configured in the form of four channels or a plurality of channels when transmitting a signal between the display panel 80.

The operation of the image quality inspection apparatus of the display panel according to the present invention having the above configuration will be described with reference to FIG. 4.

4 is a flowchart illustrating a method for checking an image quality of a display panel according to an exemplary embodiment of the present invention. First, when a power key provided in an image quality inspection apparatus is turned on by a user (S100), the image quality inspection apparatus operates. The image data to be used for the image quality inspection is selected from the image signal providing unit 70 connected to the image quality inspection device through the key input unit 20 (S110).

Then, the controller 30 receives a corresponding video signal from the video signal providing unit 70 by user selection.

In operation S120, the key input unit 20 receives a selection method of an image quality inspection image to be used for image quality inspection of the display panel 80 from the user.

In this case, when the user selects an image signal to be used for image quality check for convenience, the user may select and input the output method and the output setting of the corresponding image signal at one time through the key input unit 20.

When the output method of the quality test image selected by the user is the GVIF method, the controller 30 provides the quality test image to the GVIF module 40 to control the quality test image to be converted according to the GVIF method.

Then, the GVIF module unit 40 converts the input image quality inspection image according to the GVIF method and outputs the corresponding image signal to the display panel 80 (S130).

On the other hand, when the output method of the image quality test image selected by the user is the LVDS method, the controller 30 controls the image quality test image to be converted according to the LVDS method by providing the image quality test image to the LVDS module unit 50. do.

Then, the LVDS module unit 50 converts the input image quality inspection image according to the LVDS method and outputs the corresponding image signal to the display panel 80 (S140).

In this case, the controller 30 may output the selected image quality inspection image by the GVIF method or the LVDS method according to a predetermined output, repetitive output, or a predetermined order based on predetermined information.

The image signal providing unit 70 is at least one of a USB, Ethernet, RS-232C, or SD card, and is connected to the image quality inspection device to provide image pattern data, still image, or video necessary for image quality inspection.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

10: picture quality inspection device 20: key input unit
30 control unit 40 GVIF module unit
50: LVDS module unit 60: display unit
70: video signal providing unit 80: display panel

Claims (6)

A key input unit 20 for receiving a selection of an image quality inspection image and an image output method;
A controller 30 for controlling an image selected by a signal of the key input unit 20 to be provided to the display panel 80 according to an output method;
A display unit 60 which provides a screen for selecting an image provided to the display panel 80 and the image output method, and displays a selected output image;
The controller 30 is connected to an image signal providing unit 70 for providing the quality test image, and outputs an image provided from the image signal providing unit 70 according to a signal input from the key input unit 20. Apparatus for providing a display unit (40) or LVDS module unit (50) and outputs to the display panel (80). The method of claim 1,
The image signal providing unit 70 is at least one of a USB, Ethernet, RS-232C or SD card, and is connected to the image quality inspection device to provide image pattern data, still images or moving images necessary for image quality inspection. Device for checking the image quality of a display panel. The method of claim 1,
After the controller 30 sets the image output method by the key input unit 20, the GVIF module unit 40 converts the selected image signal into a GVIF signal, and the LVDS module unit 50 converts the selected image. And converting the signal into an LVDS signal and outputting the signal in a multi-channel form. A first step (S110) of receiving an image quality inspection image from an image signal providing unit 70 connected to the image quality inspection device by a user selection when a power-on signal of the image quality inspection device is input (S100);
A second step (S120) of receiving a selection of an output method of an image quality inspection image provided in the first step (S110);
If the output method of the image quality test image selected in the second step (S120) is a GVIF method, the image quality test image is provided to the GVIF module 40 to convert the image quality test image according to the GVIF method, and then the display panel. A third step (S130) outputting to 80;
If the output method of the image quality test image selected in the second step (S120) is the LVDS method, the image quality test image is provided to the LVDS module unit 50 to convert the image quality test image according to the LVDS method, and then the display. And a fourth step (S140) of outputting to the panel (80). 5. The method of claim 4,
And the image quality test image is output by the GVIF method or the LVDS method according to one-time output, repetitive output, or a predetermined order based on predetermined information. 5. The method of claim 4,
The image signal providing unit 70 is at least one of a USB, Ethernet, RS-232C or SD card, and is connected to the image quality inspection device to provide image pattern data, still images or moving images necessary for image quality inspection. To check the image quality of the display panel.
KR1020120072709A 2012-07-04 2012-07-04 Method and device for image testing of the display panel KR20140005466A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104010190A (en) * 2014-05-29 2014-08-27 东莞市信太通讯设备有限公司 Method for automatically detecting dead pixels of mobile phone screen before assembling
KR20160074020A (en) * 2014-12-17 2016-06-28 경운대학교 산학협력단 Test board for uhd resolution
KR20160111271A (en) * 2015-03-16 2016-09-26 주식회사 젠탑스 A patern generator for testing u h d displays using p c and patern generating method at the same
CN108346392A (en) * 2017-10-25 2018-07-31 武汉精测电子集团股份有限公司 A kind of liquid-crystalline glasses panel detection signal generation apparatus and method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104010190A (en) * 2014-05-29 2014-08-27 东莞市信太通讯设备有限公司 Method for automatically detecting dead pixels of mobile phone screen before assembling
KR20160074020A (en) * 2014-12-17 2016-06-28 경운대학교 산학협력단 Test board for uhd resolution
KR20160111271A (en) * 2015-03-16 2016-09-26 주식회사 젠탑스 A patern generator for testing u h d displays using p c and patern generating method at the same
CN108346392A (en) * 2017-10-25 2018-07-31 武汉精测电子集团股份有限公司 A kind of liquid-crystalline glasses panel detection signal generation apparatus and method
CN108346392B (en) * 2017-10-25 2021-08-13 武汉精测电子集团股份有限公司 Liquid crystal glass panel detection signal generation device and method

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