JP2006047850A - Display device, method for inspecting display device, and device for inspecting display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device for suppressing lowering of manufacturing yield by surely detecting wiring failure on a panel. <P>SOLUTION: The display device comprises: first inspection wiring 52 connected to first wiring 21 of an odd number wiring group 20 and second wiring 22 adjacent thereto; second inspection wiring 53 connected to third wiring 33 of an even number wiring group 30 and fourth wiring 34 adjacent thereto; a first switch signal line 54A for supplying switch signals to a first switch element 62A arranged between the first inspection wiring 52 and the wiring 21 and a third switch element 63A arranged between the second inspection wiring 53 and the third wiring 33; and a second switch signal line 54B for supplying switch signals to a second switch element 52B arranged between the first inspection wiring 52 and the second wiring 22 and a fourth switch element 53B arranged between the second inspection wiring 53 and the fourth wiring 34. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a display device provided with an inspection wiring for inspecting a wiring defect, an inspection method for inspecting a wiring defect based on an inspection signal input to the inspection wiring of the display device, and an inspection wiring for the display device The present invention relates to an inspection apparatus that generates an inspection signal to be input to the device.

  A display device such as a liquid crystal display device includes an effective display unit configured by matrix display pixels. The effective display section includes a plurality of scanning lines extending along the row direction of the display pixels, a plurality of signal lines extending along the column direction of the display pixels, and in the vicinity of an intersection between the scanning lines and the signal lines. A switching element arranged, a pixel electrode connected to the switching element, and the like are provided.

  A wiring group that connects between the scanning line driving circuit and each scanning line is usually arranged on one end side of the effective display section. For this reason, by inputting inspection signals to the odd-numbered scan lines and even-numbered scan lines, wiring defects on the panel, such as short-circuits and disconnections in the wiring group, and short-circuits and disconnections in the effective display area, can be detected. It is possible to inspect.

  On the other hand, an odd-numbered wiring group consisting of wirings connected to odd-numbered scanning lines is arranged on one end side of the effective display section, and an even-numbered wiring group consisting of wirings connected to even-numbered scanning lines is effective. A layout that is arranged on the other end side of the display unit has been proposed (see, for example, Patent Document 1 and Patent Document 2). Such a layout is particularly suitable for a configuration in which a single driving IC chip in which a scanning line driving unit and a signal line driving unit are integrated is applied.

In such a layout, it is possible to inspect wiring defects in the effective display section by inputting inspection signals to the odd-numbered scanning lines and even-numbered scanning lines, respectively. The defect cannot be inspected. For this reason, there is a possibility that a panel in which a wiring failure in the wiring group cannot be detected flows out to a subsequent process. In this post-process, expensive components such as a driving IC chip and a flexible printed circuit board (FPC) are mounted. Therefore, the outflow of a defective panel causes a decrease in manufacturing yield.
Japanese Patent Laid-Open No. 06-160898 JP 2001-013892 A

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a display device and a display device that can reliably detect a wiring defect on a panel and can suppress a decrease in manufacturing yield. And an inspection apparatus for a display device.

A display device according to a first aspect of the present invention includes:
A display device including an effective display unit configured by a plurality of display pixels,
It is arranged on one end side of the outer peripheral portion located outside the effective display portion, and includes wirings respectively connected to odd-numbered scanning lines to which drive signals for turning on / off the display pixels in odd-numbered rows are supplied. An odd-numbered wiring group;
An even-numbered wiring group consisting of wirings arranged on the other end side of the outer peripheral portion and connected to even-numbered scanning lines to which a drive signal for turning on and off the display pixels in even-numbered rows is supplied;
A first inspection wiring connected to the first wiring of the odd-numbered wiring group and the second wiring adjacent thereto;
A second wiring for inspection connected to a third wiring of the even-numbered wiring group and a fourth wiring adjacent thereto;
ON / OFF of a first switch element disposed between the first inspection wiring and the first wiring and a third switch element disposed between the second inspection wiring and the third wiring are turned on / off. A first switch signal line to which a switch signal for control is supplied;
ON / OFF of the second switch element disposed between the first inspection wiring and the second wiring and the fourth switch element disposed between the second inspection wiring and the fourth wiring are turned on / off. A second switch signal line to which a switch signal for control is supplied;
It is provided with.

The inspection method of the display device according to the second aspect of the present invention is as follows:
Comprising an effective display part composed of a plurality of display pixels,
It is arranged on one end side of the outer peripheral portion located outside the effective display portion, and includes wirings respectively connected to odd-numbered scanning lines to which drive signals for turning on / off the display pixels in odd-numbered rows are supplied. An odd-numbered wiring group;
An even-numbered wiring group consisting of wirings arranged on the other end side of the outer peripheral portion and connected to even-numbered scanning lines to which a drive signal for turning on and off the display pixels in even-numbered rows is supplied;
A first inspection wiring connected to the first wiring of the odd-numbered wiring group and the second wiring adjacent thereto;
A test method for a display device comprising a third wiring of the even-numbered wiring group and a second inspection wiring connected to a fourth wiring adjacent thereto,
A first switch element disposed between the first inspection wiring and the first wiring, and a third switch element disposed between the second inspection wiring and the third wiring are shared. A step of inputting a first inspection signal to the first inspection wiring and a second inspection signal to the second inspection wiring at a timing of being turned on based on a switch signal;
A second switch element disposed between the first inspection wiring and the second wiring, and a fourth switch element disposed between the second inspection wiring and the fourth wiring are shared. A step of inputting a first inspection signal to the first inspection wiring and a second inspection signal to the second inspection wiring at a timing of being turned on based on a switch signal;
Based on the input of the first and second inspection signals, the odd number wiring group, the even number wiring group, and a step of inspecting a wiring defect in the effective display unit,
It is provided with.

An inspection apparatus for a display device according to a third aspect of the present invention is:
Comprising an effective display part composed of a plurality of display pixels,
It is arranged on one end side of the outer peripheral portion located outside the effective display portion, and includes wirings respectively connected to odd-numbered scanning lines to which drive signals for turning on / off the display pixels in odd-numbered rows are supplied. An odd-numbered wiring group;
An even-numbered wiring group consisting of wirings arranged on the other end side of the outer peripheral portion and connected to even-numbered scanning lines to which a drive signal for turning on and off the display pixels in even-numbered rows is supplied;
A first inspection wiring connected to the first wiring of the odd-numbered wiring group and the second wiring adjacent thereto;
An inspection apparatus for a display device, comprising: a third wiring of the even-numbered wiring group; and a second inspection wiring connected to a fourth wiring adjacent thereto.
Input is made to the first switch element disposed between the first inspection wiring and the first wiring and the third switch element disposed between the second inspection wiring and the third wiring. A common first switch signal is generated, and is disposed between the second switch element and the second test line and the fourth line disposed between the first test line and the second line. A second switch signal to be input to the fourth switch element is generated, a first inspection signal to be input to the first inspection wiring is generated, and a second input is input to the second inspection wiring. A signal generation means for generating an inspection signal is provided.

  According to the present invention, it is possible to provide a display device, a display device inspection method, and a display device inspection device capable of reliably detecting a wiring defect on a panel and suppressing a decrease in manufacturing yield. Can do.

  Hereinafter, a display device, a display device inspection method, and a display device inspection device according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a liquid crystal display device as an example of a display device includes a liquid crystal display panel 1 having a substantially rectangular flat plate shape. The liquid crystal display panel 1 is composed of a pair of substrates, that is, an array substrate 3 and a counter substrate 4, and a liquid crystal layer 5 held as a light modulation layer between the pair of substrates. The liquid crystal display panel 1 includes a rectangular effective display unit 6 for displaying an image. The effective display unit 6 is composed of a plurality of display pixels PX arranged in a matrix.

  In the effective display section 6, the array substrate 3 extends along the column direction of the display pixels PX and a plurality of scanning lines Y (1, 2, 3,..., M) extending along the row direction of the display pixels PX. A plurality of existing signal lines X (1, 2, 3,..., N), connected to the switching elements 7 and switching elements 7 arranged for each display pixel PX in the vicinity of the intersection of the scanning lines Y and the signal lines X. The pixel electrode 8 and the like are provided.

  The switching element 7 is composed of a thin film transistor (TFT) or the like. The gate electrode 7G of the switching element 7 is electrically connected to the corresponding scanning line Y (or formed integrally with the scanning line). The drain electrode 7D of the switching element 7 is electrically connected to the corresponding signal line X (or formed integrally with the signal line). The source electrode 7S of the switching element 7 is electrically connected to the pixel electrode 8 of the corresponding display pixel PX.

  The counter substrate 4 includes a counter electrode 9 and the like common to all the display pixels PX in the effective display unit 6. The array substrate 3 and the counter substrate 4 are arranged with the pixel electrode 8 and the counter electrode 9 facing each other, and a gap is formed between them. The liquid crystal layer 5 is formed of a liquid crystal composition sealed in the gap between the array substrate 3 and the counter substrate 4.

  In a color display type liquid crystal display device, the liquid crystal display panel 1 includes a plurality of types of display pixels, for example, a red pixel that displays red (R), a green pixel that displays green (G), and a blue that displays blue (B). Has pixels. That is, the red pixel includes a red color filter that transmits light having a red main wavelength. The green pixel includes a green color filter that transmits light having a green dominant wavelength. The blue pixel includes a blue color filter that transmits light having a blue main wavelength. These color filters are arranged on the main surface of the array substrate 3 or the counter substrate 4.

  The liquid crystal display panel 1 includes a drive IC chip 11 disposed on an outer peripheral portion 10 located outside the effective display portion 6. In the example shown in FIG. 1, the driving IC chip 11 is disposed on the extending portion 10 </ b> A of the array substrate 3 that extends outward from the end portion 4 </ b> A of the counter substrate 4. The driving IC chip 11 has a signal line driving unit 11X that supplies a driving signal (video signal) to each signal line X, and a scanning line driving unit 11Y that supplies a driving signal (scanning signal) to each scanning line Y. is doing.

  The scanning line drive unit 11Y outputs a drive signal to the odd-numbered scanning lines Y (1, 3, 5,...) And the even-numbered scanning lines Y (2, 4, 6,...). ) Includes a second drive unit 11Y2 that outputs a drive signal. The first drive unit 11Y1 and the second drive unit 11Y2 are respectively disposed on both sides of the signal line drive unit 11X.

  The first drive unit 11Y1 is electrically connected to the odd-numbered scanning lines Y (1, 3, 5,...) Via the odd-numbered wiring group 20 disposed on the one end side 10B of the outer peripheral part 10. The odd-numbered wiring group 20 is configured by wirings W (1, 3, 5,...) Connected to the odd-numbered scanning lines Y (1, 3, 5,...). That is, the drive signal output from the first drive unit 11Y1 is supplied to the corresponding odd-numbered scanning line Y (1, 3, 5,...) Via each wiring W (1, 3, 5,...) The display pixels PX in the odd rows are turned on / off. In other words, the switching elements 7 included in each display pixel PX are on / off controlled based on the drive signal supplied from the corresponding scanning line Y.

  The second drive unit 11Y2 is electrically connected to the even-numbered scanning lines Y (2, 4, 6,...) Via the even-numbered wiring group 30 disposed on the other end side 10C of the outer peripheral portion 10. The even-numbered wiring group 30 is configured by wirings W (2, 4, 6,...) Connected to the even-numbered scanning lines Y (2, 4, 6,...). That is, the driving signal output from the second driving unit 11Y2 is supplied to the corresponding even-numbered scanning line Y (2, 4, 6,...) Via each wiring W (2, 4, 6,...) The display pixels PX in even-numbered rows are turned on / off.

  As shown in FIG. 2, the array substrate 3 includes a wiring defect between the odd-numbered wiring groups 20 in the outer peripheral portion 10, a wiring defect between the even-numbered wiring groups 30, and a wiring in the effective display section 6. An inspection wiring unit 40 for inspecting defects is provided. The inspection wiring section 40 includes a signal line inspection section 41 provided corresponding to the signal line driving section 11X, and a first scanning line inspection section provided corresponding to the first driving section 11Y1 of the scanning line driving section 11Y. 42, a second scanning line inspection unit 43 provided corresponding to the second drive unit 11Y2, and a pad unit 44 for inputting various signals to the inspection units 41, 42, 43.

  The signal line inspection unit 41 includes a signal line inspection wiring 51 connected to each signal line X. Here, the signal line inspection wiring 51 is a red inspection wiring 51R for supplying an inspection signal to a signal line connected to a red pixel, and a green for supplying an inspection signal to a signal line connected to a green pixel. The inspection wiring 51G and the blue inspection wiring 51B for supplying the inspection signal to the signal line connected to the blue pixel are provided.

  Further, the signal line inspection unit 41 includes a switch element 61 between each signal line X (1, 2,..., N) and the signal line inspection wiring 51 (R, G, B). These switch elements 61 are constituted by thin film transistors. That is, the gate electrode 61G of each switch element 61 is electrically connected to the common switch signal line 55. The source electrode 61S of each switch element 61 is electrically connected to the corresponding signal line inspection wiring 51 (R, G, B). Further, the drain electrode 61D of each switch element 61 is electrically connected to the corresponding signal line X.

  The first scanning line inspection unit 42 includes the first wiring 21 of the odd-numbered wiring group 20, for example, the wirings W1, W5, W9... And the second wiring 22 adjacent to the first wiring 21, for example, W3, W7, W11. The first inspection wiring 52 is connected to the first inspection wiring. The first scanning line inspection unit 42 includes a first switch element 62 </ b> A between each first wiring 21 and the first inspection wiring 52, and between each second wiring 22 and the first inspection wiring 52. A second switch element 62B is provided therebetween. The first switch element 62A and the second switch element 62B are composed of thin film transistors.

  That is, the gate electrode 62AG of the first switch element 62A is electrically connected to the first switch signal line 54A. The source electrode 62AS of the first switch element 62A is electrically connected to the corresponding first inspection wiring 52. Further, the drain electrode 62AD of the first switch element 62A is electrically connected to the corresponding first wiring 21.

  The gate electrode 62BG of the second switch element 62B is electrically connected to the second switch signal line 54B. The source electrode 62BS of the second switch element 62B is electrically connected to the corresponding first inspection wiring 52. Further, the drain electrode 62BD of the second switch element 62B is electrically connected to the corresponding second wiring 22.

  The second scanning line inspection unit 43 includes third wirings 33 of the even-numbered wiring group 30 such as wirings W2, W6, W10... And fourth wirings 34 adjacent to the third wiring 33 such as W4, W8, W12. The second inspection wiring 53 is connected to the. The second scanning line inspection unit 43 includes a third switch element 63 </ b> A between each third wiring 33 and the second inspection wiring 53, and each of the fourth wiring 34 and the second inspection wiring 53. A fourth switch element 63B is provided therebetween. The third switch element 63A and the fourth switch element 63B are constituted by thin film transistors.

  That is, the gate electrode 63AG of the third switch element 63A is electrically connected to the first switch signal line 54A common to the first switch element 62A. The source electrode 63AS of the third switch element 63A is electrically connected to the corresponding second inspection wiring 53. Furthermore, the drain electrode 63AD of the third switch element 63A is electrically connected to the corresponding third wiring 33.

  The gate electrode 63BG of the fourth switch element 63B is electrically connected to the second switch signal line 54B that is common to the second switch element 62B. The source electrode 63BS of the fourth switch element 63B is electrically connected to the corresponding second inspection wiring 53. Further, the drain electrode 63BD of the fourth switch element 63B is electrically connected to the corresponding fourth wiring 34.

  The pad portion 44 includes an input pad 71 (R, G, B) and a first inspection wiring 52 that allow a drive signal to be input to one end of each of the signal line inspection wirings 51 (R, G, B). An input pad 72 that allows a drive signal to be input to one end, an input pad 73 that allows a drive signal to be input to one end of the second inspection wiring 53, and a drive signal to one end of the first switch signal line 54A. An input pad 74A enabling input, an input pad 74B allowing input of a drive signal to one end of the second switch signal line 54B, and an input enabling input of a drive signal to one end of the switch signal line 55 A pad 75 is provided.

  The drive signal input from the input pad 71 (R, G, B) is an inspection video signal written to the pixel electrode 8 of each display pixel PX in the inspection stage. The drive signals input from the input pads 72 and 73 are inspection signals for controlling on / off of the switching element 7 of each display pixel PX in the inspection stage. The drive signals input from the input pads 74A and 74B are the first switch element 62A and the second switch element 62B of the first scanning line inspection unit 42 and the third switch element of the second scanning line inspection unit 43 in the inspection stage. This is a switch signal for controlling ON / OFF of 63A and the fourth switch element 63B. The input pad 75 is a switch signal for controlling on / off of the switch element 61 of the signal line inspection unit 41.

  Each signal line X (1, 2,... N), each wiring 21 and 22 of the odd-numbered wiring group 20, and each wiring 33 and 34 of the even-numbered wiring group 30 are connected to the driving IC chip 11 in the middle. The connection pad PD that enables the connection is provided.

  According to the liquid crystal display device having the above-described configuration, the drive signal is supplied to the odd-numbered scan lines in the layout in which the drive signals can be supplied to the odd-numbered scan lines and the even-numbered scan lines from both ends of the effective display section. The inspection signal can be input at different timings to the first wiring constituting the odd-numbered wiring group and the second wiring adjacent thereto, and the drive signal is supplied to the even-numbered scanning line. It becomes possible to input inspection signals at different timings to the third wiring configuring the even-numbered wiring group and the fourth wiring adjacent thereto. For this reason, it is possible to reliably detect wiring defects on the panel such as a short circuit between wires in the odd-numbered wiring group or disconnection of each wiring, and a short circuit between wires in the even-numbered wiring group or a disconnection of each wiring. It becomes possible.

(Inspection equipment)
Next, the inspection apparatus 100 for detecting a wiring defect on the liquid crystal display panel in the liquid crystal display device having the above-described configuration will be described. That is, as shown in FIG. 3, the inspection apparatus 100 includes a plurality of probes 101 that can be connected to each input pad of the pad unit 44, and the first inspection wiring 52 and the second inspection wiring 53 through the probes 101. The signal generation unit 102 that generates various signals including the inspection signal to be input and the switch signal to be input to the first switch signal line 54A and the second switch signal line 54B corresponds to each inspection signal generated by the signal generation unit 102. And a signal input unit 103 for inputting each switch signal to the corresponding first switch signal line 54A and second switch signal line 54B as well as being input to the first inspection wiring 52 and the second inspection wiring 53.

(Inspection method)
Next, an inspection method for detecting a wiring defect on the liquid crystal display panel in the liquid crystal display device having the above-described configuration will be described. This inspection method is a process after the liquid crystal display panel 1 is formed, and is performed as a process before the drive IC chip 11 is mounted on the liquid crystal display panel 1. In the inspection apparatus 100 applied to this inspection method, the signal generation unit 102 generates two independent inspection signals, that is, a first inspection signal and a second inspection signal, and two types of switch signals, that is, a second inspection signal. A switch signal and a second switch signal are generated.

  That is, in this inspection method, first, the probe 101 of the inspection apparatus 100 is connected to the corresponding input pad in the pad portion 44 of the liquid crystal display panel 1. Then, at a predetermined timing, the signal input unit 103 inputs the first switch signal generated by the signal generation unit 102 to the first switch signal line 54A. By such input of the first switch signal, the first switch element 62A of the first scanning line inspection unit 42 and the third switch element 63A of the second scanning line inspection unit 43 are turned on in a timely manner. The signal input unit 103 inputs the second switch signal generated by the signal generation unit 102 to the second switch signal line 54B. By such input of the second switch signal, the second switch element 62B of the first scanning line inspection unit 42 and the fourth switch element 63B of the second scanning line inspection unit 43 are turned on in a timely manner. Further, the signal input unit 103 inputs the switch signal generated by the signal generation unit 102 to the switch signal line 55. With such switch signal input, each switch element 61 of the signal line inspection unit 41 is turned on in a timely manner.

  Subsequently, the signal input unit 103 inputs the first inspection signal to the first inspection wiring 52 connected to the first wiring 21 of the odd-numbered wiring group 20 based on the first switch element 62A being turned on. . As a result, the first inspection signal is supplied to each of the odd-numbered scanning lines connected to the first wiring 21. By such input of the first inspection signal, each switching element 7 connected to the odd-numbered scanning line in the effective display unit 6 is turned on in a timely manner.

  Further, the signal input unit 103 inputs the second inspection signal to the second inspection wiring 53 connected to the third wiring 33 of the even-numbered wiring group 30 based on the third switch element 63A being turned on. As a result, the second inspection signal is supplied to each of the even-numbered scanning lines connected to the third wiring 33. By such input of the second inspection signal, the switching elements 7 connected to the even-numbered scanning lines in the effective display unit 6 are turned on in a timely manner.

  Subsequently, based on the input of the first and second inspection signals, a short circuit between the first wiring 21 and the second wiring 22 in the odd-numbered wiring group 20, the third wiring 33 and the fourth wiring in the even-numbered wiring group 30. A short circuit between the wiring 34 and a short circuit between the odd-numbered scanning line and the even-numbered scanning line in the effective display unit 6 is inspected. Here, in this inspection process, the signal generation unit 102, in a state in which each switching element 7 in the effective display unit 6 is turned on, each signal line X via the signal line inspection wiring 51 (R, G, B). Input video signal for inspection. As a result, the inspection video signal is written to each display pixel PX in the effective display section 6 of the liquid crystal display panel 1. By writing such an inspection video signal, wiring defects of various wirings on the liquid crystal display panel 1 are inspected.

  That is, as shown in FIG. 4, the first inspection signal is input from the first inspection wiring 52 at a timing at which a signal can be input from the first wiring 21 of the odd-numbered wiring group 20 to the corresponding odd-numbered scanning line, An inspection video signal is input to each signal line X. At this time, when a short circuit occurs between the adjacent first wiring 21 and the second wiring 22 in the odd-numbered wiring group 20, for example, when a short circuit occurs between the wiring W1 and the wiring W3, The first inspection signal is supplied not only to the scanning line Y1 connected to the wiring W1, but also to the scanning line Y3 connected to the wiring W3. For this reason, not only the switching element 7 of the display pixel PX connected to the scanning line Y1, but also the switching element 7 of the display pixel PX connected to the scanning line Y3 is simultaneously turned on. Therefore, originally, the switching element 7 of the display pixel PX connected to the scanning lines Y1, Y5, Y9... Should be in the on state, but due to a short circuit between the wiring W1 and the wiring W3, the scanning lines Y1, Y3,. The switching element 7 of the display pixel PX connected to Y5, Y9... Is turned on.

  As described above, when an inspection video signal is supplied in a state where each switching element 7 is turned on, the corresponding display pixel PX is turned on in the liquid crystal display panel 1. Therefore, by observing the lighting state of the display pixel PX in the liquid crystal display panel 1, it is possible to inspect a short circuit between the first wiring 21 and the second wiring 22 in the odd-numbered wiring group 20.

  Similarly, the first inspection signal is input from the first inspection wiring 52 and the inspection is applied to each signal line X at the timing at which a signal can be input from the second wiring 22 of the odd-numbered wiring group 20 to the corresponding odd-numbered scanning line. Input the signal. Thereby, a short circuit between the first wiring 21 and the second wiring 22 in the odd-numbered wiring group 20 can be inspected.

  Further, as shown in FIG. 4, at a timing at which a signal can be input from the third wiring 33 of the even-numbered wiring group 30 to the corresponding even-numbered scanning line, a second inspection signal is input from the second inspection wiring 53, An inspection video signal is input to each signal line X. At this time, when a short circuit occurs between the third wiring line 33 and the fourth wiring line 34 adjacent to each other in the even-numbered wiring group 30, for example, when a short circuit occurs between the wiring line W2 and the wiring line W4, The second inspection signal is supplied not only to the scanning line Y2 connected to the wiring W2, but also to the scanning line Y4 connected to the wiring W4. For this reason, not only the switching element 7 of the display pixel PX connected to the scanning line Y2, but also the switching element 7 of the display pixel PX connected to the scanning line Y4 is simultaneously turned on. Therefore, originally, the switching element 7 of the display pixel PX connected to the scanning lines Y2, Y6, Y10... Should be in the on state, but due to a short circuit between the wiring W2 and the wiring W4, the scanning lines Y2, Y4,. The switching element 7 of the display pixel PX connected to Y6, Y10... Is turned on. Thereby, a short circuit between the third wiring 33 and the fourth wiring 34 in the even-numbered wiring group 30 can be inspected.

  Similarly, the second inspection signal is input from the second inspection wiring 53 and the signal lines X are inspected at a timing at which a signal can be input from the fourth wiring 34 of the even-numbered wiring group 30 to the corresponding even-numbered scanning line. Input the signal. Thereby, a short circuit between the third wiring 33 and the fourth wiring 34 in the even-numbered wiring group 30 can be inspected.

  In addition, it is possible to inspect a short circuit between the odd-numbered scanning line and the even-numbered scanning line in the effective display portion 6 simultaneously with the inspection of the short circuit in the odd-numbered wiring group 20 and the even-numbered wiring group 30. That is, when a short circuit occurs between the odd-numbered scanning line and the even-numbered scanning line, for example, when a short circuit occurs between the scanning line Y1 and the scanning line Y2, the first wiring group 20 of the odd-numbered wiring group 20 In the step of inspecting a short between the first wiring 21 and the second wiring 22, when a first inspection signal is input from the first wiring 21 to the corresponding odd-numbered scanning line, the first inspection is applied to the scanning line Y1 and the scanning line Y3. A signal is supplied. For this reason, not only the switching element 7 of the display pixel PX connected to the scanning line Y1, but also the switching element 7 of the display pixel PX connected to the scanning line Y2 is simultaneously turned on. Therefore, originally, the switching element 7 of the display pixel PX connected to the scanning lines Y1, Y5, Y9... Should be in the on state, but due to the short circuit between the scanning lines Y1 and Y2, the scanning lines Y1, Y2,. The switching element 7 of the display pixel PX connected to Y2, Y5, Y9... Is turned on.

  In this way, when an inspection video signal is supplied to each signal line X in a state where each switching element 7 is turned on, the corresponding display pixel PX is turned on in the liquid crystal display panel 1. For this reason, by observing the lighting state of the display pixel PX in the liquid crystal display panel 1, it is possible to inspect a short circuit between adjacent scanning lines.

  Further, according to the above-described inspection method, in addition to the inspection of the short circuit between the wirings, the connection pad that enables connection with the drive IC chip 11 by observing the lighting state of the display pixel PX in the liquid crystal display panel 1. It is also possible to inspect the disconnection from the PD to the end of each wiring. That is, by observing the lighting state of the display pixel PX based on the input of various inspection signals, the first wiring 21 and the second wiring 22 that constitute the odd-numbered wiring group 20 and the third wiring that configures the even-numbered wiring group 30. It is possible to inspect the disconnection to the end of each of the wiring 33, the fourth wiring 34, and the scanning line Y and the signal line X in the effective display section 6 (if a disconnection occurs, the corresponding display pixel PX Does not light up).

  As described above, according to the inspection method, for the liquid crystal display device having a layout capable of supplying drive signals to the odd-numbered scanning lines and the even-numbered scanning lines from both ends of the effective display unit, The first inspection signal is input at different timings to the first wiring and the second wiring adjacent to each other constituting the wiring group. Based on the input of such an inspection signal, it is possible to reliably detect a wiring defect in the odd-numbered wiring group. In addition, the inspection apparatus inputs the second inspection signal at different timings with respect to the third wiring and the fourth wiring adjacent to each other that configure the even numbered wiring group. Based on the input of such an inspection signal, it is possible to reliably detect a wiring defect in the even-numbered wiring group. At the same time, it is possible to reliably detect wiring defects such as a short circuit between the odd-numbered scanning lines and the even-numbered scanning lines and disconnection of the scanning lines and signal lines in the effective display portion. Therefore, it is possible to prevent the wiring defect from flowing into the subsequent process of the liquid crystal display panel, and to suppress a decrease in manufacturing yield.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the components without departing from the gist of the invention in the stage of implementation. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine the component covering different embodiment suitably.

  The display device of the present invention is not limited to the liquid crystal display device described above, and may be a display device having a layout capable of supplying drive signals to the odd-numbered scan lines and even-numbered scan lines from both ends of the effective display section. For example, an organic electroluminescence display device using a self-luminous element as a display element may be used.

FIG. 1 schematically shows a configuration of a liquid crystal display panel of a liquid crystal display device according to an embodiment of the present invention. FIG. 2 is a diagram schematically showing the configuration of the inspection wiring portion of the liquid crystal display panel shown in FIG. FIG. 3 is a diagram schematically showing a configuration of an inspection apparatus applicable to the liquid crystal display panel shown in FIG. FIG. 4 is a diagram for explaining an inspection method applicable to the liquid crystal display panel shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display panel, 20 ... Odd number wiring group, 30 ... Even number wiring group, 40 ... Inspection wiring part, 100 ... Inspection apparatus, PX ... Display pixel, X ... Signal line, Y ... Scanning line, W ... Wiring

Claims (5)

A display device including an effective display unit configured by a plurality of display pixels,
It is arranged on one end side of the outer peripheral portion located outside the effective display portion, and includes wirings respectively connected to odd-numbered scanning lines to which drive signals for turning on / off the display pixels in odd-numbered rows are supplied. An odd-numbered wiring group;
An even-numbered wiring group consisting of wirings arranged on the other end side of the outer peripheral portion and connected to even-numbered scanning lines to which a drive signal for turning on and off the display pixels in even-numbered rows is supplied;
A first inspection wiring connected to the first wiring of the odd-numbered wiring group and the second wiring adjacent thereto;
A second wiring for inspection connected to a third wiring of the even-numbered wiring group and a fourth wiring adjacent thereto;
ON / OFF of a first switch element disposed between the first inspection wiring and the first wiring and a third switch element disposed between the second inspection wiring and the third wiring are turned on / off. A first switch signal line to which a switch signal for control is supplied;
ON / OFF of the second switch element disposed between the first inspection wiring and the second wiring and the fourth switch element disposed between the second inspection wiring and the fourth wiring are turned on / off. A second switch signal line to which a switch signal for control is supplied;
A display device comprising:   The said 1st and 2nd test | inspection wiring and 1st and 2nd switch signal line have the input pad which enables the input of a drive signal in each one end part, The Claim 1 characterized by the above-mentioned. Display device. Comprising an effective display part composed of a plurality of display pixels,
It is arranged on one end side of the outer peripheral portion located outside the effective display portion, and includes wirings respectively connected to odd-numbered scanning lines to which drive signals for turning on / off the display pixels in odd-numbered rows are supplied. An odd-numbered wiring group;
An even-numbered wiring group consisting of wirings arranged on the other end side of the outer peripheral portion and connected to even-numbered scanning lines to which a drive signal for turning on and off the display pixels in even-numbered rows is supplied;
A first inspection wiring connected to the first wiring of the odd-numbered wiring group and the second wiring adjacent thereto;
A test method for a display device comprising a third wiring of the even-numbered wiring group and a second inspection wiring connected to a fourth wiring adjacent thereto,
A first switch element disposed between the first inspection wiring and the first wiring, and a third switch element disposed between the second inspection wiring and the third wiring are shared. A step of inputting a first inspection signal to the first inspection wiring and a second inspection signal to the second inspection wiring at a timing of being turned on based on the first switch signal;
A second switch element disposed between the first inspection wiring and the second wiring, and a fourth switch element disposed between the second inspection wiring and the fourth wiring are shared. A step of inputting a first inspection signal to the first inspection wiring and a second inspection signal to the second inspection wiring at a timing of being turned on based on a second switch signal;
Based on the input of the first and second inspection signals, the odd number wiring group, the even number wiring group, and a step of inspecting a wiring defect in the effective display unit,
An inspection method for a display device, comprising: Comprising an effective display part composed of a plurality of display pixels,
It is arranged on one end side of the outer peripheral portion located outside the effective display portion, and includes wirings respectively connected to odd-numbered scanning lines to which drive signals for turning on / off the display pixels in odd-numbered rows are supplied. An odd-numbered wiring group;
An even-numbered wiring group consisting of wirings arranged on the other end side of the outer peripheral portion and connected to even-numbered scanning lines to which a drive signal for turning on and off the display pixels in even-numbered rows is supplied;
A first inspection wiring connected to the first wiring of the odd-numbered wiring group and the second wiring adjacent thereto;
An inspection apparatus for a display device, comprising: a third wiring of the even-numbered wiring group; and a second inspection wiring connected to a fourth wiring adjacent thereto.
Input is made to the first switch element disposed between the first inspection wiring and the first wiring and the third switch element disposed between the second inspection wiring and the third wiring. A common first switch signal is generated, and is disposed between the second switch element and the second test line and the fourth line disposed between the first test line and the second line. A second switch signal to be input to the fourth switch element is generated, a first inspection signal to be input to the first inspection wiring is generated, and a second input is input to the second inspection wiring. An inspection apparatus for a display device, comprising signal generation means for generating an inspection signal.   Furthermore, the first inspection signal generated by the signal generation means at the timing when the first switch element and the third switch element are turned on based on the input of the first switch signal is input to the first inspection wiring. The second inspection signal is input to the second inspection wiring, and the signal generation unit generates the signal at the timing when the second switch element and the fourth switch element are turned on based on the input of the second switch signal. 5. The display device according to claim 4, further comprising signal input means for inputting a first inspection signal to the first inspection wiring and inputting the second inspection signal to the second inspection wiring. Inspection device.

Images