Wiring structure of wiring area on liquid crystal displaying panel and testing method of liquid crystal displaying panel

A wiring structure of a wiring area on a liquid crystal displaying panel includes a number of wiring lines connected to one end of a corresponding data line and corresponding scan line on the wiring area, at least one signal testing point, a number of first testing lines connected between the wiring lines and the signal testing point, a number of second testing lines connected between the signal testing point and the other end of the corresponding data line and the corresponding scan line, and a switch controlling circuit connected to the second testing lines. After the testing lines are disconnected from the wiring lines in the previous process, the testing signal still can be transmitted through the other end of the corresponding data line or the scan line, to implement the image test of the liquid crystal displaying panel.

This is a National Phase Application filed under 35 U.S.C. 371 as a national stage of PCT/CN2010/076143, filed May 28, 2012, an application claiming the benefit under 35 USC 119(e) Chinese Application No. 201210111153.4, filed Apr. 16, 2012, the content of each of which is hereby incorporated by reference in its entirety.

BACKGROUND

1. Technical Field

The present disclosure relates to liquid crystal displaying technologies, and particularly, to a wiring structure of a wiring area on a liquid crystal displaying panel and a testing method of the liquid crystal displaying panel.

2. Description of Related Art

A conventional liquid crystal display (LCD) equipment mainly includes a liquid crystal displaying panel and a backlight module. Referring toFIG. 1, the liquid crystal displaying panel includes a display area1and a wiring area2adjacent to the display area1. The display area1includes a number of data lines and gate lines. The wiring area2includes a number of wiring lines3connected to each data line and gate line, and testing lines4connected to the wiring lines3.

In celling process of the LCD, when images shown in a liquid crystal displaying panel are being tested, an image testing apparatus outputs testing signals from signal testing points5to the display area1through the testing lines4and the wiring lines3. After the image testing apparatus finishes testing the liquid crystal displaying panel, a laser cutting machine cuts off a connecting portion6between the testing lines4and the wiring lines3. Then the liquid crystal displaying panel can be supplied to the subsequent moduling process.

During moduling process, a chip-on-film (COF) is attached to a pad of each of the wiring lines3for supplying a signal. During moduling process, it is also necessary to test images shown in the liquid crystal displaying panel. When the liquid crystal displaying panel is tested to be unqualified, it is supposed to figure out the reason for the unqualified product during the moduling process or the celling process, in which the COF needs to be removed to allow the image shown in the liquid crystal displaying panel to be tested again by the testing apparatus. But the connecting portion6between the testing lines4and the wiring lines3has been cut off by the laser cutting machine during the celling process, therefore the apparatus in the celling process can not be applied to test the liquid crystal displaying panel again, which brings difficulty to figure out the reason causing the unqualified products.

Furthermore, during reliability assurance (RA) testing, there is a possibility that the image test can not be implemented during the celling process.

SUMMARY

One object of the present disclosure is to provide a wiring structure of a wiring area on a liquid crystal displaying panel. The wiring structure includes a number of wiring lines respectively connected to one end of a corresponding data line and corresponding scan line on the wiring area, at least one signal testing point, configured to receive testing signal for testing a liquid crystal displaying panel with the wiring structure, a number of first testing lines connected between the wiring lines and the at least one signal testing point, a number of second testing lines connected between the at least one signal testing point and the other end of each data line and scan line, and a switch controlling circuit connected to the second testing lines, configured to control the path of the testing signal from the signal testing point to the display area of the liquid crystal displaying panel.

Preferably, the switch controlling circuit includes electronic switches connected between the second testing lines and the corresponding data lines or scan lines, and a controlling signal input point for turning on and off the electronic switches, the controlling signal input point is connected to the electronic switches via a switch controlling bus; when the first testing lines are connected to the wiring lines, the controlling signal input point receives a low-level signal for turning off the corresponding electronic switches, the testing signal is transmitted through the signal testing point, the first testing lines, the corresponding wiring line, and one end of the corresponding data line or corresponding scan line in that order to the display area; when the first testing lines are disconnected from the wiring lines, the controlling signal input point receives a high-level signal for turning on the corresponding electronic switch, the testing signal is input from the signal testing point, and transmitted through the second testing lines, the corresponding electronic switch, and the other end of the corresponding data line or scan line in that order to the display area.

Preferably, the electronic switches are thin film transistors (TFTs), the gate of each of the TFTs is connected to the switch controlling bus, the drain thereof is connected to the corresponding data line, and the source thereof is connected to the second testing line.

Preferably, each of the electronic switches connected to the second testing line is simultaneously formed with the TFT.

Preferably, a chip-on-film is attached to the pad of each of the wiring lines.

Preferably, each signal testing point includes a first signal testing point and a second signal testing point, one end of the first signal testing point is connected to the wiring line of the corresponding data line through the first testing line of the data line, and the other end thereof is connected to the other end of the data line through the second testing line of the data line; one end of the second signal testing point is connected to the wiring line of the corresponding scan line through the first testing line of the scan line, and the other end thereof is connected to the other end of the scan line through the second testing line of the scan line.

The present disclosure further provides a testing method of a liquid crystal displaying panel using the wiring structure, includes:

receiving a high-level signal or a low-level signal corresponding to the connecting state between the wiring lines and the first testing lines;

controlling the path of the testing signal received by the controlling signal input point of entering into the display area on the liquid crystal displaying panel.

Preferably, the step of receiving a high-level signal or a low-level signal corresponding to the connecting state between the wiring lines and the first testing lines includes:

when the wiring lines are connected to the first testing lines, controlling the signal input point to receive a low-level signal;

when the wiring lines are disconnected from the first testing lines, controlling the signal input point to receive a high-level signal.

Preferably, the step of controlling the path of the testing signal received by the controlling signal input point of entering into the display area on the display panel includes:

when the controlling signal input point receives the low-level signal, turning off the electronic switch connected to the second testing lines, and transmitting the testing signal through the signal testing point, the first testing lines, the wiring lines, and one end of the corresponding data line or corresponding scan line in that order to the display area;

when the controlling signal input point receives the high-level signal, turning on the electronic switch connected to the second testing lines, and transmitting the testing signal through the signal testing point, the second testing lines, the electronic switch, and one end of the corresponding data line or scan line in that order to the display area.

Preferably, the electronic switches are TFTs, the gate of the TFT is connected to the switch controlling bus, the drain thereof is connected to the corresponding data line, and the source thereof is connected to the second testing line.

In the wiring structure of a wiring area on a liquid crystal displaying panel and a testing method of the liquid crystal displaying panel of the present disclosure, the second testing lines are connected to the other end of the corresponding scan line which has one end connected to the corresponding wiring line, and are connected to the other end of the corresponding data line which has one end connected to the corresponding wiring line. The wiring structure further forms a switch controlling circuit capable of controlling the path of the testing signal from the signal testing points to the display area. Thereafter, although the first testing lines are disconnected from the corresponding wiring lines, the testing signal from the signal testing points still can be transmitted through the other end of the corresponding data line or the scan line, to implement the image test of the liquid crystal displaying panel. Obviously, the wiring structure in this embodiment can avoid the problem of finding reasons for unqualified products by the image testing apparatus again as soon as the testing lines are disconnected from the wiring lines, which brings large help to analysis and test of the product. Furthermore, the new testing circuit shares the same signal testing points with the original testing circuit, which makes the testing apparatus keep its original structure, it is easier to satisfy, and also reduce cost.

DETAILED DESCRIPTION

The main solution in the embodiment is: the wiring structure forms the second testing lines connected to the other end of the scan line which has one end connected to the corresponding wiring line, and the second testing lines connected to the other end of the data line which has one end connected to the corresponding wiring line. The wiring structure further forms a switch controlling circuit for controlling the path of the testing signal from the signal testing points to the display area. Thereafter, although the first testing lines are disconnected from the corresponding wiring lines, the testing signal from the signal testing points still can be transmitted through the other end of the corresponding data line or the scan line, to implement the image test of the liquid crystal displaying panel.

Referring toFIG. 2, a wiring structure of a wiring area on a liquid crystal displaying panel in an embodiment is shown. The liquid crystal displaying panel which contains the wiring area includes a display area10and a wiring area adjacent to the display area10. The display area10includes a number of data lines101and a number of scan lines102. The wiring area includes a data line wiring area20corresponding to the data lines101and a scan line wiring area21corresponding to the scan lines102. The data line wiring area20includes a number of wiring lines201each which is connected to one end of the corresponding data line101, and the scan line wiring area21includes a number of wiring lines211each which is connected to one end of the corresponding scan line102. A COF for supplying signal is attached to a pad70of each of the wiring lines201,211.

Specifically, in the embodiment, the wiring structure of the wiring area includes the wiring lines201,211, signal testing points50,51, first testing lines30,31, second testing lines40,41, and a switch controlling circuit. The wiring lines201, the signal testing points50, the first testing lines30, and the second testing lines40are disposed corresponding to the data lines101. The wiring lines211, the signal testing points51, the first testing lines31, and the second testing lines41are disposed corresponding to the scan lines102.

The signal testing points50,51are used for receiving testing signals for testing the liquid crystal displaying panel.

One end of each of the data lines101is connected to the corresponding first testing line30through the corresponding wiring line201, and the other end thereof is connected to the second testing line40. One end of each of the scan lines102is connected to the corresponding first testing line31through the corresponding wiring line211, and the other end thereof is connected to the second testing line41.

Specifically, one end of each of the first signal testing points50is connected to the corresponding wiring line201through the corresponding first testing line30, and the other end thereof is connected to the other end of the corresponding data line101through the second testing line40. One end of each of the second signal testing points51is connected to the corresponding wiring line211through the corresponding first testing line31, and the other end thereof is connected to the other end of the corresponding scan line102through the second testing line41of the scan line102.

The switch controlling circuit is connected to the second testing lines40,41for controlling the path of the testing signals from the corresponding signal testing points50,51to the display area10of the liquid crystal displaying panel.

In the embodiment, the switch controlling circuit includes an electronic switch62, and a controlling signal input point60. The electronic switch62is connected between the second testing line40/41and the corresponding data line101or the corresponding scan line102. The signal input point60is connected to the electronic switch62via a switch controlling bus61, for turning on and off the electronic switch62.

When the first testing lines30/31are connected to the corresponding wiring lines201/211, the controlling signal input point60receives a low-level signal for turning off the corresponding electronic switch62. The testing signal is transmitted through the signal testing point50/51, the first testing lines30/31, the corresponding wiring line201/211, and one end of the corresponding data line101/scan line102in order to the display area10of the liquid crystal displaying panel, to drive the liquid crystal displaying panel to display images.

When the first testing lines30/31is disconnected from the corresponding wiring line201/211, the controlling signal input point60receives a high-level signal for turning on the corresponding electronic switch62. The testing signal is input from the signal testing point50/51, and transmitted through the second testing lines40/41, the corresponding electronic switch62, and one end of the corresponding data line101/scan line102in order to the display area10of the liquid crystal displaying panel, to drive the liquid crystal displaying panel to display images.

In the embodiment, the electronic switch62is a thin film transistor (TFT). The gate of the TFT is connected to the switch controlling bus61, the drain thereof is connected to the corresponding data line101/102, and the source thereof is connected to the corresponding second testing line40/41.

As is mentioned before, a testing method of a liquid crystal displaying panel in the conventional technology includes the following steps: connecting each data line101or scan line102via certain testing lines, such as the first testing lines30/31in this embodiment; outputting testing signal to the TFT array of the liquid crystal displaying panel via the testing lines; and cutting off the connections between the testing lines and each signal line by laser after the images on the liquid crystal displaying panel are tested. Therefore, the following assembly of the drive circuit can be implemented.

In this embodiment, during the celling process, after an image testing apparatus finishes testing the images on the liquid crystal displaying panel, the connections between the first testing lines30,31and the wiring lines are also cut off. When testing the images in the following moduling process, if a liquid crystal displaying panel is tested to be unqualified, the images need to be tested again in the image testing apparatus in the celling process for figuring out the reason for the unqualified product. The signal testing points50,51still can retest the circuit via a standby conductive path, a peripheral electronic switch62, and the controlling signal input point60. The peripheral electronic switch62and switches on the display area10can be simultaneously formed with the TFT.

When the images are being tested during celling process, the controlling signal input point60inputs a low-level DC signal to turn off the electronic switch62. The testing signal is input from the signal testing point50/51, and transmitted through the first testing lines30/31to the display area10, to drive the liquid crystal displaying panel to display images, and thereafter the liquid crystal displaying panel can be tested.

After the image testing apparatus finishes testing the images during the celling process, the connections between the first testing lines30/31and the corresponding wiring line201/211are cut off. When testing the image shown on the liquid crystal displaying panel during the following moduling process, if a liquid crystal displaying panel is tested to be unqualified, it is supposed to test the liquid crystal displaying panel again in the image testing apparatus. The controlling signal input point60is applied to input a high-level DC signal to turn on the electronic switches62. The testing signal is input from the signal testing point50/51, and transmitted through the other end of the corresponding data line101or scan line102, to the display area10of the LCD, to drive the liquid crystal displaying panel to display images, and thereafter the image test of the liquid crystal displaying panel can also be implemented.

When there is no need to test the product after the moduling process, a low-level DC signal is applied to the controlling signal input point60to turn off the electronic switch62. Thus, the circuit of the second testing lines40/41connected to the other end of the data lines101or the scan line102is not in use.

In this embodiment, the second testing lines40are connected to the other end of each of the scan lines102which is away from the corresponding wiring line211, and the second testing lines41are connected to the other end of each of the corresponding data line101, and the switch controlling circuit is capable of controlling the path of the testing signal from the signal testing points50/51to the display area10. Therefore, although the first testing lines30/31is disconnected from the corresponding wiring lines201/211, the testing signal from the signal testing points50/51still can be transmitted through the other end of the corresponding data line101or the scan line102, to implement the image test of the liquid crystal displaying panel. Obviously, the wiring structure in this embodiment can avoid the problem of figuring out reasons for unqualified products by the image testing apparatus again as soon as the testing lines are disconnected from the wiring lines, which brings large help to analysis and test of the product. Furthermore, the new testing circuit shares the same signal testing points50/51with the original testing circuit, which allows the testing apparatus to keep its original structure, it is easier to satisfy, and also reduce cost.

FIG. 3is flowchart of a testing method of a liquid crystal displaying panel in an embodiment using the wiring structure of a wiring area on a liquid crystal displaying panel. The testing method includes the following steps:

Step S101, according to the connecting state between the wiring lines and the first testing lines, the switch controlling circuit correspondingly receives a high-level signal or a low-level signal. Specifically, when the wiring lines are connected to the first testing lines, the controlling signal input point receives a low-level signal; and when the wiring lines are disconnected from the first testing lines, the controlling signal input point receives a high-level signal.

Step S102, the switch controlling circuit controls the path of the testing signal received by the controlling signal input point of entering into the display area on the display panel, and thus starting to test the display panel. Specifically, when the controlling signal input point receives a low-level signal, the controlling circuit turns off the electronic switches of the second testing lines, thus, the testing signal is transmitted through the signal testing point, the corresponding wiring line, and one end of the corresponding data line or the corresponding scan line in order to the display area; when the controlling signal input point receives a high-level signal, the controlling circuit turns on the electronic switches, thus, the testing signal is transmitted through the signal testing point, the second testing lines, the corresponding electronic switch, and one end of the corresponding data lines or the scan lines in order to the display area.

All the above-mentioned electronic switches are TFTs. The gate of each of the TFTs is connected to the switch controlling bus, the drain thereof is connected to the corresponding data line, and the source thereof is connected to the corresponding second testing line.

As it is mentioned before, in the conventional technology, a frequently-used testing method of a liquid crystal displaying panel includes the following steps: connecting each data line or scan line via certain testing lines, such as the first testing lines in this embodiment; outputting testing signal to the TFT array of the liquid crystal displaying panel via the testing lines; cutting off the connections between the testing lines and the signal lines by laser after the test is finished.

In this embodiment, during the celling process, after the test is finished, the connections between the first testing lines and the wiring lines are also cut off. When the image shown on the liquid crystal displaying panel is being tested during the following moduling process, if a liquid crystal displaying panel is tested to be unqualified, it is supposed to test the liquid crystal displaying panel again in the celling process for figuring out the reason for the unqualified product. The signal testing points can still be used to test the lines via a standby conductive path, a peripheral electronic switches, and controlling signal input point, in which the peripheral electronic switch and the display area can be simultaneously formed.

When the image is being tested in the celling process, the controlling signal input point inputs a low-level DC signal to turn off the electronic switch. The testing signal is input from the signal testing point, and transmitted through the first testing lines to the display area for driving the liquid crystal displaying panel to display images, thus, the liquid crystal displaying panel can be tested.

After the image testing apparatus finishes testing the image in the celling process, the connections between the first testing lines and the corresponding wiring line are cut off. When the image shown on the liquid crystal displaying panel is tested during the following moduling process, if a liquid crystal displaying panel is tested to be unqualified, it is supposed to test the liquid crystal displaying panel again in the celling process. At this time, a high-level DC signal is inputted via the controlling signal input point for turning on the electronic switches. The testing signal is input from the signal testing point, and transmitted through the other end of the corresponding data line or scan line, to the display area10of the LCD, to drive the liquid crystal displaying panel to display images, and thereafter the image test of the liquid crystal displaying panel can also be implemented.

When there is no need to test the product after the moduling process, a low-level DC signal is inputted via the controlling signal input point for turning off the electronic switch. The circuit of the second testing lines connected to the other end of the data lines101or the scan line is not in use.

In the wiring structure of the wiring area of the liquid crystal panel and the testing method of the liquid crystal panel of the present disclosure, the second testing lines41are connected to the other end of the corresponding scan line102which is away from the corresponding wiring line211, and are connected to the other end of each of the corresponding data line101which is way from the corresponding wiring line201. The wiring structure further provides the switch controlling circuit capable of controlling the path of the testing signal from the signal testing points50/51to the display area10. Therefore, although the first testing lines are disconnected from the corresponding wiring lines, the testing signal from the signal testing points still can be transmitted through the other end of the corresponding data line or the scan line, to implement the image test of the liquid crystal displaying panel. Obviously, the wiring structure in this embodiment can avoid the problem of figuring out reasons for unqualified products by the image testing apparatus again as soon as the testing lines are disconnected from the wiring lines, which brings large help to analysis and test of the product. Furthermore, the new testing circuit shares the same signal testing points with the original testing circuit, which makes the testing apparatus keep its original structure, it is easier to satisfy, and also reduce cost.

Even though information and the advantages of the present embodiments have been set forth in the foregoing description, together with details of the mechanisms and functions of the present embodiments, the disclosure is illustrative only; and that changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the present embodiments to the full extend indicated by the broad general meaning of the terms in which the appended claims are expressed.