JP2980794B2 - Inspection board and inspection device for color display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a test board for a color display device, and more particularly to a test for performing a monochrome display test of a color display device, a short-circuit between signal wires, a disconnection test of each wire, and a measurement of a wire resistance. Regarding the substrate.

[0002]

2. Description of the Related Art There is a tendency that liquid crystal display devices are frequently used as flat panel displays instead of CRTs.
In addition to spatial convenience, in particular, an active matrix drive type liquid crystal display device in which a switching element is provided for each picture element in a display area has been put into practical use. This is because the display characteristics are as excellent as CRTs, and the power consumption is low.

As a display inspection of a color liquid crystal display device, there is an inspection of a display state of three primary colors, red, green and blue. In the display inspection of a single color, the distribution of each color in the display surface is evaluated, and the inspection of the short circuit or the disconnection of the wiring is also performed. Conventionally, there is the following method for a single color display inspection.

A method of performing a display test by externally inputting a display signal to a display device while a driving driver is mounted on the display device.

A method in which a drive driver is not mounted on a display device, and a display test is performed by interposing a contact pin, a flexible substrate, or the like between the drive driver and the display device.

[0006]

In the method according to the above, when a defect occurs, the mounted driving driver is wasted and the manufacturing cost is greatly increased.

[0007] When a display driver is connected to a display device via a contact pin or the like for display inspection as described above, the number of wirings to be connected is large, it takes time, and it is very inefficient. Also, the contact pins are expensive and the manufacturing cost is increased.

In any of these cases, the use of a drive driver for display inspection increases workability and costs for the inspection apparatus and its maintenance. The present invention has been made in order to solve such a problem, and is not limited to a liquid crystal display device. For a wide color display device, an inspection device capable of performing a single-color display inspection with high accuracy and at a reduced cost is provided. The purpose is to provide.

[0009]

An inspection substrate of a color display device according to the present invention has an insulating first substrate and a second substrate which are opposed to each other, and the first substrate is provided with the first substrate. A plurality of first inspection wirings arranged in parallel with each other at a predetermined pitch on the surface of one substrate, and the first inspection wirings, where n is an integer starting from 1, and the arrangement order is represented by (3n-2) A first intermediate wiring that is a collection of one inspection wiring, a first inspection connection terminal connected to the first intermediate wiring, and the first inspection whose arrangement order is represented by (3n-1) A second intermediate wiring that is a collection of wiring, a second inspection connection terminal connected to the second intermediate wiring, and an arrangement order of 3
n having a third intermediate wiring, which is formed by concentrating the first inspection wiring represented by n, and a third inspection connection terminal connected to the third intermediate wiring. The wiring and the first inspection wiring are arranged so as not to be electrically connected to the intermediate wiring and the first inspection wiring belonging to different inspection connection terminals, and the second substrate is On the surface of the second substrate facing the first substrate, there are provided second inspection wirings arranged at the same pitch as the first inspection wirings and in the same number as the first inspection wirings. The first substrate and the second substrate are electrically connected between the first inspection wiring and the second inspection wiring corresponding to the first inspection wiring, respectively. An inspection substrate for a color display device connected via a film, whereby the object is achieved.

An inspection apparatus for a color display device according to the present invention includes the inspection substrate.

[0011]

The inspection substrate for monochrome display inspection of the color display device of the present invention has the above-described configuration, and the inspection connection terminal, the intermediate wiring, and the branch wiring are divided into three types. Can be independently applied to the data signal lines of the corresponding display device. That is,
Single color display is possible without a driver.

[0012]

Embodiments of the present invention will be described below. The present invention is not limited by the embodiment.

1 and 2 show an inspection board according to the present invention. The inspection board according to the present embodiment includes the first board 11 and the second board 11.
It has two substrates 12. FIG. 1 shows a plan view of the first substrate 11 and the second substrate 12.

The first substrate 11 is, as shown in FIG.
For example, three types of test connection terminals 1a, 1b, 1c are formed on a substrate surface made of an insulating material such as glass or epoxy resin.
Having. The three types of the test connection terminals 1a, 1b, and 1c are described below because each of the test connection terminals 1a, 1b,
1c is for separately inputting data signals for color display, respectively, because the data signals for color display correspond to the three primary colors of light.

Intermediate wirings 2a, 2b, 2c extend from the inspection connection terminals 1a, 1b, 1c, respectively.
A plurality of branch wirings 3a,... (hereinafter, represented by 3a) are arranged in a branch at the end of the intermediate wiring 2b.
A plurality of branch wirings 3b,... Similarly, at the end of the intermediate wiring 2c, a plurality of branch wirings 3c,.
c) are arranged in a branched manner. The branch wirings 3 (3a, 3b, 3c) are arranged on the surface of the first substrate 11 in parallel with each other. In practice, the number of the wirings exceeds several hundreds to over 1,000 on the entire surface of the first substrate 11. Although they are provided, only a small number of them are drawn in the figures of this section, since it is enough to explain the concept of the present invention.

The branch wirings 3 (3a, 3b, 3
The subscripts a, b, and c in c) correspond to the respective blocks divided into three blocks depending on the arrangement order of the branch wirings 3 on the surface of the first substrate 11 for convenience. For example, the branch wiring 3a having the subscript “a”
And an arrangement number (hereinafter simply referred to as an arrangement number) represented by the general formula (3n-2) (specifically, 1, 4, 7, 10,...). The block of the branch wiring 3 having the symbol () is shown. Similarly, the branch wiring 3 having the arrangement number represented by the general formula (3n-1) is represented by 3b, and the branch wiring 3 having the arrangement number represented by the general formula 3n is represented by 3c. Is shown. The respective branch wirings 3 are arranged at the same pitch as the arrangement pitch of the data signal lines of the color display device to be inspected (hereinafter simply referred to as a display device).

The branch wirings 3a, 3b, 3c, the intermediate wirings 2a, 2b, 2c and the test connection terminals 1a, 1b, 1c belonging to different blocks are arranged so as not to be electrically connected. An anisotropic conductive film 5 is formed to cover the branch wiring 3b, and an anisotropic conductive film 6 is formed to cover the branch wirings 3a and 3c.

On the other hand, as shown in FIG. 1B, the second substrate 12 has the same pitch as the arrangement pitch of the data signal lines of the display device on the surface thereof, and the same number of the test wirings 4 ( 4a, 4b, 4c,...) Are arranged in parallel with each other. The inspection wires 4 correspond to the arrangement of the data signal lines of the display device, and also correspond to the branch wires 3a, 3b, and 3c on the first substrate 11 described above. In FIG. 1B, 4a, 4a,...
4a. 4b, 4b,..., 4c, 4c,...), 4b, 4c, and the corresponding numbers with the branch wirings 3a, 3b, 3c. That is, the inspection wiring 4a corresponding to the branch wiring 3a whose arrangement number is represented by the general formula (3n-2) has the same arrangement number (3n-2) as the branch wiring 3a. (1),
(4), (7), (10),... The same applies to the inspection wirings 4b and 4c.

The first substrate 11 and the second substrate 12 are arranged such that their respective wiring arrangement surfaces face each other.
The anisotropic conductive films 5 and 6 formed on 1 are opposed to each other. As shown in FIG. 2, the inspection substrate 10 of the present embodiment has the two substrates 11, 12 fixed by thermocompression bonding of the anisotropic conductive films 5, 6. The connection between the inspection board 10 and the display device is made at the data signal line terminal of the display device, as described later.

FIG. 3 shows a display substrate 20 on which the data signal lines of the display device are arranged. FIG. 3A is a schematic view of the display substrate 20, and FIG. 3B is an enlarged view of the data signal line terminal portion 21 of the display substrate 20. Each data signal line terminal 2
The subscripts a, b, and c attached to 2 indicate the inspection connection terminals 1a, 1b, 1c, the intermediate wirings 2a, 2b,
2c, the sub wirings 3a, 3b, 3c and the subscripts of the inspection wirings 4a, 4b, 4c of the second substrate 12.

FIG. 4 shows a state in which the inspection board 10 of the present invention is connected to a display device. FIG. 4A is a front view, and FIG.
(B) is a plan view. The data signal line terminal 22 (22a, 22b, 22) of the data signal line terminal portion 21 of the display device.
c) and the inspection wiring 4 (4
a, 4b, 4c) are connected.

The current flow when a signal voltage is applied from the inspection connection terminals 1a, 1b, 1c on the first substrate 11 in such a connection state is as follows. A case where a signal voltage is applied to the inspection connection terminal 1a on the first substrate 11 shown in FIG. When a predetermined signal voltage is applied to the test connection terminal 1a, a current flows through the branch wiring 3a through the intermediate wiring 2a extending from the test connection terminal 1a. An anisotropic conductive film 6 is formed on the branch wiring 3a. However, the current that reaches the branch wiring 3a is The second film flows in the thickness direction of the film 6 and corresponds to the branch wiring 3a.
The inspection wiring 4a on the substrate 12 is reached. The current due to the signal voltage applied to the test connection terminal 1a does not flow through the test wires 4b and 4c on the second substrate 12 disposed at positions not corresponding to the branch wires 3a. The current that has reached the inspection wiring 4a on the second substrate 12 flows through the inspection wiring 4a, and flows to the data signal line via the data signal line terminal 22a of the display device connected thereto. The flow of the current by the voltage applied to the other inspection connection terminals 1b and 1c is in accordance with this. The inspection board 10 of the present embodiment, in which the first substrate 11 and the second substrate 12 are assembled, applies a data signal to the data signal line of the display device. The scanning signal input substrate for applying the voltage will be described below. FIG. 5 shows this scanning signal input substrate.

The scanning signal input substrate is a first substrate 31
(Hereinafter, referred to as a scanning signal first substrate 31 to distinguish it from the first substrate 11 of the inspection substrate 10 of the present invention) and a second substrate 32
(Similarly, a scanning signal second substrate 32).
The scanning signal first substrate 31 has two scanning signal input terminals 41.
x and 41y, and intermediate wirings 42x and 42y extending from the scanning signal input terminals 41x and 41y, respectively. At the end of the intermediate wiring 42x, a plurality of branch wirings 43
x,... (hereinafter, represented by 43x) are arranged in a branched manner, and a plurality of branch wirings 43 are provided at the end of the intermediate wiring 42b.
.. (hereinafter, represented by 43y) are arranged in a branched manner. The branch wirings 43 (43x, 43y) are arranged parallel to each other in the longitudinal direction of the first scanning signal substrate 31,
The arrangement pitch of the adjacent branch wirings 43 is the same pitch as the scanning lines of the display device. Each branch wiring 43x, 43y
Are the signal input connection terminals 41x, 4
It is arranged so that there is no electrical continuity with the branch wiring and intermediate wiring belonging to a connection terminal different from 1y. An anisotropic conductive film 46 is formed to cover these branch wirings 43.

The branch lines 43x and 43y on the scanning signal first substrate 31 and the scanning signal input terminals 41x and
1y and the intermediate wirings 42x and 42y connected thereto are divided into two types of blocks of x and y. When the display device is driven by the Cs-ON-Gate method, it is located between adjacent scanning lines. This is because it is necessary to input scanning signals at different timings. Also for this block division, an arrangement number is given to the branch wiring 43 for convenience, and the subscript x is added to the branch wiring 43 whose arrangement number is represented by the general formula (2n-1), where n is an integer starting from 1. The branch wiring 43 represented by the general formula 2n is provided with a subscript y.

On the surface of the scanning signal first substrate 31, in addition to the scanning signal input terminals 41x and 41y, another counter electrode signal input terminal 41z for inputting a counter electrode signal is provided.
A counter electrode signal input wiring 42z extending from the counter electrode signal input terminal 41z is provided.

On the other hand, at the same pitch as the arrangement pitch of the scanning lines of the display device on the surface of the scanning signal second substrate 32,
The same number of inspection wirings 44 (44x, 44y,...
・) Are arranged in parallel with each other. The numbers 44x and 44y given for convenience correspond to the branch lines 43x and 43y on the first scanning signal substrate 31. Further, the scanning signal second
On the surface of the substrate 32, an inspection wiring 45 corresponding to the counter electrode wiring of the display device is provided in parallel with the inspection wiring 44. The inspection wiring 45 is the same as the scanning signal first substrate 3 described above.
1 also corresponds to the counter electrode signal input wiring 42z on the first line.

The scanning signal first substrate 31 and the scanning signal second substrate 32 face the wirings arranged on the respective substrates so that the corresponding wirings are connected to each other. The branch wirings 43x, 4 on the scanning signal first substrate 31
The anisotropic conductive films 46 formed on 3y are arranged to face each other. Scanning signal first substrate 31 and scanning signal second substrate 32
Means that the anisotropic conductive film 46 is fixed by thermocompression bonding. When the scanning signal for display inspection is input, the inspection wiring 44 (44x, 44y,...) On the scanning signal second substrate 32 is connected to the scanning line terminal of the display device. Since the connection state between the inspection wiring 4 (4a, 4b, 4c) of the second substrate 12 and the data signal line terminal 22 (22a, 22b, 22c) of the display device at the time of inputting the data signal is the same, Is omitted.

Next, a method of inspecting a display device using the inspection substrate according to the present embodiment will be described. As an example, in a color liquid crystal display device, a data signal non-input state,
That is, a description will be given of a monochromatic red display in a normally white mode in which light passes through a display medium when there is no potential difference between each pixel electrode and a counter electrode corresponding to the pixel electrode.

First, the inspection board 10 and the scanning signal input board are connected to the display device as described above.

Next, the inspection connection terminals 1a of the first substrate 11
1b and 1c, the data signal
The scanning signal is input from the scanning signal input terminals 41 x and 41 y of the substrate 31 to the counter electrode signal input terminal 4 of the scanning signal first substrate 31.
1z, a counter electrode signal is input.

Here, various signal waveforms input to the inspection board and the scanning signal input board for performing the monochrome display will be described. FIG. 6 shows an example of these signal waveforms. Data signals 51a, 51b, 51c, scanning signals 61x,
61y and the counter electrode signal are indicated by 61z. The data signal 51a is for red display, from the test connection terminal 1a, the data signal 51b is for green display, the data signal 51c is from the test connection terminal 1b, and the data signal 51c is for blue display.
Input from c. The scanning signals 61x and 61y are respectively input to the scanning signal input terminals 41x and 41x on the scanning signal first substrate 31.
From y, the counter electrode signal 61z is input from the counter electrode signal input terminal 41z on the scanning signal first substrate 31.

As shown in FIG. 6, both the red display data signal 51a and the counter electrode signal 61z are set to have a constant voltage linear waveform, and there is no potential difference between the two signals. When input to the input terminal, there is no potential difference between the picture element electrode of the picture element for red display of the display device and the corresponding counter electrode. Therefore, all of the picture elements in this portion transmit light, and are brought into a red display state.

On the other hand, the green display data signal 5 shown in FIG.
1b, the blue display data signal 51c is set as a rectangular wave having a potential difference with the counter electrode signal 61z having a constant voltage waveform, so that a potential difference is generated between the picture element electrode and the counter electrode of the display device. Therefore, all of the green display picture elements and the blue display picture elements of the display device do not transmit light, and the entire display state of the display device is a monochromatic display of red in which green and blue are cut off.

Similarly, each data signal 51a of FIG.
By exchanging the input terminal positions of 51b and 51c, a single color display of green or blue becomes possible.

FIG. 6 shows a normally black system in which the display medium blocks light when the display device is in a data signal non-input state, that is, when there is no potential difference between each pixel electrode of the display device and the corresponding counter electrode. Data signals 51a, 51
If two of b and 51c are constant voltage signals having the same potential as the counter electrode potential, and the other one is a rectangular wave which causes a potential difference between the counter electrode potential and the other, a single color similar to that of the normally white method is used. Display becomes possible.

In this embodiment, the counter electrode signal 6 shown in FIG.
1z and a constant voltage signal equal to the potential of the counter electrode signal 61z (in the above example, the data signal 51 for red display).
Although the potentials in a) are shown as non-zero, if both are set to zero potential, no extra power supply is required, and the efficiency of the equipment as a whole can be improved. As described above, according to the inspection board and the inspection method of the present embodiment, the driving driver is not used,
Monochromatic display can be easily realized.

Further, if the inspection board according to the present invention is used,
In addition to a monochrome display, a leak test between data signal lines of the display device can be performed. In this leak test, for example, in a manufacturing process of an active matrix substrate constituting a liquid crystal display device, adjacent data signal lines are short-circuited due to poor resist coating, poor etching, foreign matter intrusion, or the like. This is for detecting the defective display device.

For example, resistance measuring means such as a tester and test connection terminals 1a, 1a on the first substrate 11 of the test substrate of the present invention.
If a relay circuit is provided between b and 1c, the relay circuit is operated by an external control device, and the resistance is measured by the resistance measuring means, the data of the display device can be obtained by the wiring configuration of the inspection board of the present invention. For one (a, b, c) group arranged in the arrangement order of the signal lines, two resistance measurements between ac and bc, two resistance measurements between ab and ac, or a
Two resistance measurements, such as two resistance measurements between b and bc, can be performed at a stretch for each.

Next, a specific flow of the inspection by the inspection apparatus provided with the inspection substrate according to the present invention will be described. FIG. 7 shows an overall configuration of an example of an inspection apparatus 100 provided with an inspection board according to the present invention. The inspection apparatus 100 includes a moving stage 101
It has. The moving stage 101 is for setting the display device at the position where the inspection substrate 10 is placed, and can be moved vertically and horizontally by the control computer 102. Above the moving stage 101, the inspection substrate 10 according to the present invention is mounted. A drive circuit 103 for sending a test drive signal to each connection terminal of the test board 10 is connected to the test board 10 in advance. On both sides of the moving stage 101, one side is provided with a transfer device 104a for a display device carry-in process, and the other side is provided with a transfer device 104b for a carry-out process. With the inspection apparatus having such a configuration, the monochrome display inspection of the display device is performed as follows.

First, the display device carried in from the step before the inspection step is placed in the stocker 105a. When a predetermined number of display devices are placed in the carry-in side stocker 105a, subsequently, the transfer device 104 is moved from the stocker 105a.
It is placed on the moving stage 101 by a. The moving stage 101 is provided with a cold-cathode tube for backlight and a polarizing plate (both not shown), and the transported display device is placed on the cold-cathode tube and the polarizing plate. You. When the display device is mounted, the polarizing plate is also mounted on the display device, and the setting of the display device is completed.

When the setting of the display device is completed, the moving stage 101 is raised, and each input terminal of the display device is connected to the inspection wiring of the inspection substrate 10. When the connection process between the inspection substrate 10 and the display device is completed, a monochrome color display inspection and a leak inspection are performed according to the above-described inspection method.

The display device after both inspections is carried by the moving stage 101 to the carrying device 104b on the carry-out side.
Subsequently, the paper is sent to the stocker 105b on the discharge side. Thereafter, only non-defective products are transferred to the post-process.

The inspection method according to the present invention can be applied not only to an active matrix type color display device but also to a simple matrix type color display device and a color display device having a two-terminal element such as an MIM as a switching element.

[0044]

As described above, when the inspection board according to the present invention is used, a single color display can be performed on a color display device without a driving driver. Inspection can be performed easily and accurately. Inspection equipment is also inexpensive and maintenance is easy.

[Brief description of the drawings]

FIG. 1 is a view showing a first substrate and a second substrate constituting an inspection substrate according to the present embodiment.

FIG. 2 is a perspective view of an inspection board according to the embodiment.

FIG. 3 is an enlarged view of a display substrate and its data signal line terminal portion.

FIG. 4 is a diagram showing a connection between the inspection board and the display device according to the embodiment.

FIG. 5 is a diagram showing a scanning signal input substrate.

FIG. 6 is a diagram showing waveforms of various signals input to an inspection board and a scanning signal input board.

FIG. 7 is a diagram showing an overall configuration of an inspection apparatus using the inspection board according to the embodiment.

[Explanation of symbols]

 1a, 1b, 1c Inspection connection terminal 2a, 2b, 2c Intermediate wiring 3 (3a, 3b, 3c) Branch wiring 4 (4a, 4b, 4c) Inspection wiring 5, 6 Anisotropic conductive film 10 Inspection substrate 11 First substrate 12 Second substrate 20 Display substrate 21 Data signal line terminal 22 (22a, 22b, 22c) Data signal line terminal 31 Scan signal first substrate 32 Scan signal second substrate 41x, 41y Scan signal input terminal 41z Counter electrode signal input terminal 42x, 42y Intermediate wiring 42z Counter electrode signal input wiring 43 (43x, 43y) Branch wiring 44 (44x, 44y) Inspection wiring 45 Inspection wiring 46 Anisotropic conductive films 51a, 51b, 51c Data signal 61x, 61y Scanning signal 61z Opposition Electrode signal 100 Inspection device 101 Moving stage 102 Control computer 103 Drive circuit 104 , 104b conveying device 105a, 105b Stocker

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shoji Hosomi 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (72) Inventor Ryu Mizugami 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Sharp Corporation (72) Inventor Motoki Iguro 22-22 Nagaikecho, Abeno-ku, Osaka City, Osaka Prefecture Inside Sharp Corporation (56) References JP-A-3-215824 (JP, A) JP-A-4-221778 (JP, A) JP-A-5-142553 (JP, A) JP-A-5-341307 (JP, A) JP-A-6-347813 (JP, A) JP-A-63-250625 (JP, A) (58) Survey Field (Int.Cl. ⁶ , DB name) G02F 1/13 101 G02F 1/1343 G02F 1/1345 G02F 1/133 G01R 31/00

Claims (2)

(57) [Claims] An insulating first substrate and a second insulating substrate which are opposed to each other;
A plurality of first inspection wirings arranged in parallel at a predetermined pitch on the surface of the first substrate, and n is an integer starting from 1. A first intermediate wiring, which is formed by concentrating the first inspection wiring whose arrangement order is represented by (3n-2); a first inspection connection terminal connected to the first intermediate wiring; A second inspection wiring connected to the first inspection wiring whose order is represented by (3n-1), a second inspection connection terminal connected to the second intermediate wiring, and an arrangement order of 3n A third intermediate wiring that converges the first inspection wiring represented by the following, and a third inspection connection terminal connected to the third intermediate wiring, and the intermediate wiring belonging to each inspection connection terminal And the first inspection wiring is disposed so as not to be electrically connected to the intermediate wiring and the first inspection wiring belonging to different inspection connection terminals. The second substrate is provided on the surface of the second substrate facing the first substrate at the same pitch as the first inspection wiring and in the same number as the first inspection wiring. A first inspection wiring provided on the first substrate and a second inspection wiring corresponding to the first inspection wiring. An inspection substrate for a color display device, wherein the second substrate is connected to the second substrate with a conductive film interposed therebetween. 2. An inspection apparatus for a color display device comprising the inspection substrate.