JPH10311984A - Liquid crystal display panel, liquid crystal display device, inspecting method for liquid crystal display panel, and manufacture of the liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the liquid crystal display panel and liquid crystal display device, and the inspecting method for the liquid crystal display panel and the manufacturing method for the liquid crystal display device which make it possible to easily discriminate panel kinds with high certainty and reduce defect occurrence by preventing a different kind of panel from being mixed. SOLUTION: The liquid crystal display device 40 is constituted including the liquid crystal display panel 10 and a connection substrate 30. The liquid crystal display panel 10 has a 1st substrate 20 and a 2nd substrate 22 facing each other across liquid crystal and also has electrodes formed on those substrates. The liquid crystal display panel 10 has an electrode terminal group 12 which is formed on the 2nd substrate 22 and connected to electrodes respectively and a discrimination mark 50 which is formed nearby the electrode terminal group 12 and serves as a positioning mark for fitting the connection substrate, 30 and as a mark for discriminating a panel kind. The connection board 30 also has a positioning mark and discrimination mark 42 corresponding to the discrimination mark 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a liquid crystal display panel,
The present invention relates to a liquid crystal display device, a method for inspecting a liquid crystal display panel, and a method for manufacturing a liquid crystal display device.

[0002]

2. Description of the Related Art A liquid crystal display device is widely used as a display unit for displaying visible information in various electronic devices such as a telephone, a portable telephone, a pager, and an electronic organizer. The liquid crystal display device includes a liquid crystal display panel, a liquid crystal driving IC, and, if necessary, ancillary devices such as a backlight and a casing. 2. Description of the Related Art A liquid crystal display panel constituting a liquid crystal display device has a structure in which liquid crystal is sealed between two substrates that are arranged to face each other.

In recent years, liquid crystal display panels serving as display surfaces for displaying visible information have been extremely diversified in pixel configuration, display design, product size, and the like, and various types of panels have been manufactured. In addition, there are many similar types of panels, and it is difficult to identify them. For this reason, in the manufacturing process of the liquid crystal display panel and the like, there has been a problem of mixing different types of panels. On the other hand, panel model confirmation work is performed in the panel manufacturing process and the like, but the work is extremely complicated, and there is a problem that it is not always sufficient.

For example, when the product size of a liquid crystal display panel is substantially the same and there are a plurality of panel models that differ only in a part of the display design, the operation of checking the panel model is as follows.
This must be performed when the liquid crystal display panel is turned on. Usually, in the panel lighting inspection process before the mounting process, the panel model confirmation work is performed visually through image recognition means such as a monitor, but it is difficult to detect a difference in only a part of the display design, If an identification error occurs during the lighting inspection, a liquid crystal display device using a heterogeneous panel is determined to be defective after completion of the product through a mounting process of a liquid crystal drive circuit.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is possible to easily and highly reliably identify panel models, and to reduce the occurrence of defects by preventing mixing of panels of different models. It is an object of the present invention to provide a liquid crystal display panel, a liquid crystal display device, a method for inspecting a liquid crystal display panel, and a method for manufacturing a liquid crystal display device that can be achieved.

[0006]

According to a first aspect of the present invention, there is provided a liquid crystal display panel comprising a pair of substrates opposed to each other with a liquid crystal interposed therebetween and a plurality of electrodes formed on the substrates. An electrode terminal group formed on at least one of the pair of substrates and respectively connected to the plurality of electrodes; and an electrode terminal group formed near the electrode terminal group, the electrode terminal group and the liquid crystal display panel And a positioning mark for attaching a connection board for connecting to a liquid crystal drive circuit for driving the display to the substrate, wherein the positioning mark is an identification mark for identifying a panel model.

According to the first aspect of the present invention, since the liquid crystal display panel has the identification mark, the panel model can be identified not by the display design or the like but by the mark. The model panel can be easily identified. In addition, the identification mark of the liquid crystal display panel is also used as a positioning mark for mounting the connection board, so that at the time of mounting the connection board, the alignment mark, which is always made at this time, is checked at the same time as the panel model. Can also be identified. Therefore,
Different types of panels can be easily and reliably identified, and the occurrence of defects due to mixing of different types of panels can be reduced. Further, since the alignment mark also serves as the identification mark, the time and effort for forming the identification mark can be saved.

[0008] The liquid crystal display panel according to the second aspect of the present invention is characterized in that, in the first aspect, the identification mark has a unique shape for each panel model.

According to the second aspect of the present invention, it is possible to visually and easily identify a panel model.

According to a third aspect of the present invention, in the liquid crystal display panel according to the first or second aspect, the identification mark has a shape corresponding to an alignment mark provided on the connection substrate. Features.

According to the third aspect of the present invention, the identification mark has a shape corresponding to the alignment mark provided on the connection board, so that the identification mark can be compared with the alignment mark of the connection board. As a result, it is possible to determine whether or not the panel is a heterogeneous panel very easily and with high reliability.

According to a fourth aspect of the present invention, in the liquid crystal display panel according to the third aspect, the outer shape of the identification mark partially matches the outer shape of a positioning mark provided on the connected substrate. It is characterized by being provided in.

According to the fourth aspect of the present invention, the identification mark of the liquid crystal display panel and the alignment mark provided on the connection board are partially matched with each other, so that the alignment at the time of mounting and the panel of different models can be used. It is possible to easily and highly reliably determine whether or not there is. In addition, since it is not necessary to match all of the identification marks on the liquid crystal display panel, the mounting area of the connection board can be reduced.

According to a fifth aspect of the present invention, there is provided a liquid crystal display panel according to any one of the first to fourth aspects, a display driving circuit for driving the liquid crystal display panel, and an electrode terminal of the liquid crystal display panel. A liquid crystal display device including a group and a connection substrate for connecting the liquid crystal drive circuit is defined.

According to a sixth aspect of the present invention, in the fifth aspect, the connection substrate is provided with an alignment mark for attaching the connection substrate to the liquid crystal display panel, and the alignment mark is A liquid crystal display device characterized by an identification mark for identifying a connection board of a model corresponding to a liquid crystal display panel is defined.

According to the fifth and sixth aspects of the present invention, it is possible to easily and highly reliably identify different types of panels, and to reduce the occurrence of defects by preventing mixing of different types of panels. Thus, a liquid crystal display device that can perform the above-described operations can be obtained.

In addition, in the invention according to claim 6,
Since the connection substrate also has an identification mark that also serves as an alignment mark, it is possible to easily and reliably determine a different model panel based on whether or not the identification marks of the liquid crystal display panel and the connection substrate are compatible with each other. be able to.

According to a seventh aspect of the present invention, there is provided a method for inspecting a liquid crystal display panel according to any one of the first to fourth aspects, wherein before the step of attaching the connection board to the liquid crystal display panel, Detecting the identification mark, and, if the identification mark is determined to be different from the identification mark of the desired panel type, excluding the liquid crystal display panel as a different type panel. I do.

The invention according to claim 8 defines a method for manufacturing a liquid crystal display device according to claim 5 or claim 6, wherein the method for inspecting a liquid crystal display device according to claim 7 is used to define a desired method. Selecting a liquid crystal display panel, and attaching the connection substrate to the selected liquid crystal display panel.

In the invention according to the seventh and eighth aspects, the liquid crystal display panel has an identification mark which is also used as an alignment mark of the connection board, so that the identification of the panel model can be performed by the display design or the like. Since different types of panels can be easily identified because the marks can be used instead of the marks, the panel models can be identified simultaneously with the confirmation of the alignment marks before mounting the connection board.
Accordingly, a method for inspecting a liquid crystal display panel and a method for manufacturing a liquid crystal display device, which can easily and highly reliably identify different types of panels and can reduce the occurrence of defects due to mixing of different types of panels. be able to.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an exploded perspective view showing a liquid crystal display device according to the present embodiment.

As shown in FIG. 1, the liquid crystal display device 40
It is configured to include the liquid crystal display panel 10 and the connection board 30 and is incorporated in various electronic devices such as a mobile phone, a telephone, a pager, and an electronic organizer, and is widely used as a display unit for displaying visible information.

FIG. 5 is a sectional view showing the liquid crystal display panel 10. The liquid crystal display panel 10 is a simple matrix drive liquid crystal display panel, and forms a display surface for displaying visible information.

The liquid crystal display panel 10 has a first substrate 20 and a second substrate 22 which are arranged to face each other. First substrate 20
The second substrate 22 is made of a transparent and flexible polymer film such as a polyethylene terephthalate film or a polybutylene terephthalate film. On the inner surfaces of the first substrate 20 and the second substrate 22,
Transparent electrodes 14 and 16 are formed respectively. Each of these transparent electrodes 14 and 16 is made of ITO (Indiu).
(M Tin Oxide) film or other transparent conductive material, and a predetermined pattern is processed. Further, a film of, for example, polyimide or the like is formed on the transparent electrodes 14 and 16 as an alignment layer 18 and subjected to an alignment process.

The first substrate 20 and the second substrate 22 are sealed with a predetermined gap, that is, a so-called cell gap, by an annular sealing member 26 provided on the inner periphery between the two substrates, and the liquid crystal 100 is filled in the gap. It is enclosed. Further, in order to maintain a constant cell gap, fine particles having a uniform particle size, such as silicon dioxide, are dispersed as the spacer material 28.

As shown in FIG. 5, one end of the second substrate 22 projects beyond the end of the first substrate 20, and the electrode terminal group 12 is formed on the inner surface of this portion. ing.

The electrode terminal group forming surface 24 of the second substrate 22 on which the electrode terminal groups 12 are formed is a mounting area for the connection substrate 30 (see FIG. 1). The transparent electrode 14 on the first substrate 20 side and the transparent electrode 16 on the second substrate 22 side
Is conducted. Therefore, the electrode terminal group 12 formed on the electrode terminal group formation surface 24 of the second substrate 22
When a liquid crystal drive signal is connected to each of the transparent electrodes 14 and 16 and the electrode terminal group 12 is input, the transparent electrodes 14 and 16 are connected.
The liquid crystal drive signal can be sent to any of the above.

As shown in FIG. 1, the electrode terminal group 12 is formed on the electrode terminal group forming surface 24 except for a predetermined range on both ends. That is, the electrode terminal formation region is a portion excluding both end portions on the electrode terminal group formation surface 24. At one end 25 where the electrode terminal group 12 is not formed, an identification mark 50 that is a positioning mark for adjusting the mounting position of the connection board 30 and a mark for identifying the panel model is formed. ing.

The identification mark 50 has a shape unique to each panel model, and has a cross shape in the present embodiment. The identification mark 50 is the transparent electrode 1
4, 16 and the electrode terminal group 12, ITO (In
(Din Tin Tin Oxide) film and other transparent conductive materials. When the transparent electrodes 14, 16 and the electrode terminal group 12 are formed on the first substrate 20 and the second substrate 22 in the manufacturing process of the liquid crystal display panel 10, Formed at the same time. However, the identification mark 50 has no input line and is not lit.

The connection substrate 30 is made of ITO (Indium)
A TCP (Tape) in which a driving IC 34 is mounted on a flexible wiring board 32 in which a wiring pattern is formed of a Tin Oxide (Film) film or another transparent conductive material, for example, a polyester film, and a thermocompression resin is coated on the polymer film. Carrier Package)
Make That is, in the liquid crystal display device 40, the connection between the liquid crystal display panel 10 and the display drive circuit is made by a so-called TA.
B (Tape Automated Bonding)
The connection method is adopted.

The connection between the connection substrate 30 and the liquid crystal display panel 10 is performed by connecting the connection terminals 34 of the connection substrate 30 and the electrode terminal group 12 of the liquid crystal display panel 10. More specifically, a mounting portion 38, which is one end of the connection substrate 30 on the side where the connection terminals 34 are formed, is thermocompression-bonded to the electrode terminal group formation surface 24 of the liquid crystal display panel main body 10.

As described above, the mounting portion 38 of the connection board 30
Has a connection terminal 36 corresponding to the electrode terminal group 12 of the liquid crystal display panel 10 and is attached to the electrode terminal group formation surface 24. One end 39 of the attachment portion 38 is connected to the electrode terminal group of the liquid crystal display panel 10. The space corresponding to one end 25 of the terminal group formation surface 24 is a space where no electrode pattern is formed. The one end 39 is a positioning mark for attaching the connection board 30 to the electrode terminal group forming surface 24 of the liquid crystal display panel 10 and is a connection board 30 corresponding to the model of the liquid crystal display panel 10. An identification mark 42 that is a mark for identifying is formed.

The identification mark 42 has the same shape as the identification mark of the panel model to which the connection board 30 corresponds. In the present embodiment, the identification mark 42 has the same cross shape as the identification mark 50 of the liquid crystal display panel 10. ing. The identification mark 42 is made of ITO (Indiu) as in the case of the wiring pattern.
m Tin Oxide) film or other transparent conductive material, and is formed at the same time when a wiring pattern is formed in the process of manufacturing the connection substrate 30.

Identification mark 5 of liquid crystal display panel 10
0 and the identification mark 42 of the connection board 30 can be accurately aligned so that the terminal pitches of the electrode terminal groups 12 of the liquid crystal display panel 10 and the connection terminals 36 of the connection board 30 are matched to each other. It is formed so as to be set at a position where both are connected.

In the liquid crystal display device 40, the identification mark 50 of the liquid crystal display panel 10 having the same shape and the identification mark 42 of the connection substrate 30 are accurately overlapped, and the connection substrate 30 is attached to the liquid crystal display panel 10. Installed.

Next, a method of manufacturing the liquid crystal display device 40 having the above-described configuration will be described.

First, pattern electrodes are formed on two substrates,
The liquid crystal display panel 10 shown in FIG. 5 is manufactured through the steps of forming the alignment layer, assembling the cell, sealing the cell, injecting the liquid crystal, and sealing the injection port. Since these steps are well known in the art, a description thereof will be omitted, but in the step of forming a pattern electrode on the substrate, an identification mark 50 is formed on the end 25 of the electrode terminal group forming surface 24 of the second substrate 22. (See FIG. 1). As the liquid crystal display panel 10, various types of panels having different display designs and the like are manufactured.

After performing various inspections such as a lighting inspection of the liquid crystal display panel 10 manufactured through the above-described steps, the connection substrate 30 is mounted. Before mounting the connection board 30, an inspection step for checking the panel model shown below is included. Note that the connection substrate 30 is of a model corresponding to a desired liquid crystal display panel for manufacturing the liquid crystal display device 40.

Here, the liquid crystal display panels to be inspected are liquid crystal display panels 10a and 10b. First, before mounting the connection board 30, the alignment mark and identification mark 50a of the liquid crystal display panel 10a and the alignment mark and identification mark 42 of the connection board 30 are detected using an image recognition means such as a monitor. At this time, as shown in FIG. 2A, if the shape of the identification mark 50a matches the shape of the identification mark 42, the liquid crystal display panel 10a
It is determined that the panel corresponds to the desired model. That is, specifically, in FIG.
Both 0a and the identification mark 42 form a cross shape, and both coincide with each other. After the inspection, the alignment is performed by superimposing the identification mark 42 of the connection substrate 30 on the identification mark 50a of the liquid crystal display panel 10a.
Is implemented.

Next, similarly, the alignment mark / identification mark 50b of the liquid crystal display panel 10b and the alignment mark / identification mark 42 of the connection board 30 are detected by using image recognition means such as a monitor. At this time, FIG.
As shown in (B), the identification mark 50b has a double circular shape, which is different from the identification mark 42 of the connection substrate 30 having a cross shape. In this case, the liquid crystal display panel 10b
It is determined that the panel is not a panel of a desired model corresponding to the connection board 30, and this panel is excluded as a panel of a different model without mounting.

Thus, after the inspection of the liquid crystal display panel 10, the connection board 30 is mounted, and the liquid crystal display device 40 is manufactured. The liquid crystal display device 40 is used as one component of various electronic devices such as a mobile phone, a telephone, and a pager. In addition, the liquid crystal display panel 10 may be provided with accessories such as a polarizing plate, a retardation plate, and a reflecting plate as necessary.

As described above, according to the liquid crystal display device 40 and the method of manufacturing the same according to the present embodiment, since the liquid crystal display panel 10 has the identification mark 50 unique to the panel model, Identification can be easily performed by the identification mark 50. In addition, since the identification mark 50 is also used as a positioning mark for mounting the connection board 30, the identification of the panel model can be performed simultaneously with the confirmation of the alignment mark always performed when the connection board 30 is mounted. Can also do
Before mounting the connection board 30, it is possible to prevent mixing of panels of different types. Further, since the alignment mark also serves as the identification mark 50, the labor of forming the identification mark is omitted, and since the identification mark 50 is formed simultaneously with the formation of the pattern electrode, the formation is easy. In addition, the identification mark 50
Since each has a unique shape for each panel model, its identification is extremely easy visually.

In addition, since the connection substrate 30 also has the identification mark 42 having the same shape as the identification mark of the corresponding panel model, the liquid crystal display panel 10
The panel model can be easily confirmed by detecting and comparing the identification mark 50 of FIG. Further, since the identification mark 42 on the side of the connection board 30 is also used as the alignment mark, identification can be performed simultaneously with confirmation of the alignment mark at the time of mounting, and the labor of forming the identification mark can be omitted. Therefore, according to the liquid crystal display device 40 and the method of manufacturing the same according to the present embodiment, it is possible to prevent mixing of different types of panels very easily and with high reliability before mounting the connection substrate 30. It is possible to reduce the occurrence of defects due to mixing of panels.

FIGS. 3A and 3B are views showing a main part of a liquid crystal display device 60 according to a modification, and FIG. 3A is a plan view showing a state before the connection board 70 is mounted. FIG. 3B is a plan view showing a state after the connection board is mounted.

The liquid crystal display device 60 includes a liquid crystal display panel 62
And a connection board 70. The liquid crystal display device 60 according to the modified example is according to the above-described embodiment except that a part of the identification mark 72 included in the connection substrate 70 is adapted to the identification mark 66 included in the liquid crystal display panel 62. This is the same as the liquid crystal display panel 40. Therefore, only the differences will be described here, and the description of the same points will be omitted.

As shown in FIG. 3A, the alignment mark and identification mark 66 formed at one end 65 of the electrode terminal group forming surface 64 of the liquid crystal display panel 62 has a cross shape unique to the panel model. Make a shape. On the other hand, the alignment mark and identification mark 72 formed at one end 75 of the attachment portion 74 of the connection board 70 has a shape obtained by dividing the cross shape into two. The identification mark 72 is set to match the outer shape of the half of the identification mark 66 on the electrode terminal group 68 side of the liquid crystal display panel 62 of the corresponding panel model. Then, in the manufacturing process of the liquid crystal display device 60, after detecting and determining the identification marks 66 and the identification marks 72, the identification marks 72 of the connection substrate 70 are applied to the identification marks 66 of the liquid crystal display panel 62, and the electrodes of the identification marks 66. Positioning is performed by overlapping the outer shape with the half of the terminal group 68 side, and the connection substrate 70 is mounted on the liquid crystal display panel 62 (see FIG. 3B). Note that FIG. 3A and FIG.
In (B), reference numeral 76 denotes a connection terminal, and reference numeral 7 denotes a connection terminal.
Reference numeral 8 denotes a driving IC.

According to the liquid crystal display panel 60 according to the modification, in addition to the same operation and effect as the above-described embodiment, the connection substrate 70 needs to cover the entire area of the liquid crystal display panel 62 where the identification mark 66 is formed. There is no connection board 70
Can be reduced, and the empty space of the connection board 70 where no wiring pattern is formed can be reduced.

The present invention is not limited to the above-described embodiment and modifications, and various modifications can be made within the scope of the present invention.

For example, in the above-described embodiment, the identification marks of the liquid crystal display panel and the connection substrate are each formed of an ITO (Indium Tin Oxide) film or another transparent conductive material. However, the present invention is not limited to this. For example, the identification mark may be formed by a stamp or the like.

Further, in the above-described embodiments and the modified examples, the case has been described where the identification mark of the liquid crystal display panel and the identification mark of the connection board are at least partially overlapped with each other. For example, as shown in FIG. 4, the identification mark 82 of the liquid crystal display panel 80 has a shape having a concave portion 84, and the identification mark 92 of a corresponding connection substrate 90 has a shape having a convex portion 94. The convex portion 94 of the identification mark 92 may be adapted to the concave portion 84 of the identification mark 82.

Further, only the liquid crystal display panel may have an identification mark capable of identifying the panel model, and the connection substrate side may have only the alignment mark without having the identification mark unique to the corresponding panel model. Even in this case, the model of the panel can be confirmed by the alignment mark and the identification mark of the liquid crystal display panel, and the mixing of panels of different models can be prevented.

The identification mark does not necessarily have to have a shape unique to the panel model. If the identification mark can be identified for each panel model, for example, the formation position of the identification mark may be changed for each model.

The inspection process of the panel model does not necessarily have to be performed in conjunction with the mounting process of the connection board, but may be performed alone at a predetermined time.

Further, in the above-described embodiment,
As the liquid crystal display panel constituting the liquid crystal display device, an example in which the liquid crystal display panel is a simple matrix drive liquid crystal display panel has been described. However, the present invention is not limited thereto. An active matrix liquid crystal display panel using a three-terminal switching element represented by a TFT or a two-terminal switching element represented by an MIM may be used. Further, the present invention is applicable to various types of liquid crystal display panels such as a ferroelectric liquid crystal display panel.

Further, in the above embodiment, an example in which the connection substrate is formed by using TCP has been described. By doing so, a liquid crystal display device may be configured. Alternatively, a liquid crystal display panel fixed to a metal frame as a housing can be used as a liquid crystal display device, which is a component for electronic devices. Further, in the case of a backlight type, a liquid crystal display panel and a light guide having a backlight can be incorporated in a metal frame to constitute a liquid crystal display device.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a liquid crystal display device according to the present embodiment.

FIGS. 2A and 2B are plan views showing a method of inspecting a liquid crystal display panel in a process of manufacturing a liquid crystal display device.

FIGS. 3A and 3B are diagrams illustrating a main part of a liquid crystal display device according to a modified example, in which FIG. 3A is a plan view showing a state before a connection board is mounted, and FIG. It is a top view.

FIG. 4 is a plan view showing a main part of a liquid crystal display device according to a modification, and showing a state before mounting a connection substrate.

FIG. 5 is a sectional view showing a liquid crystal display panel.

[Explanation of symbols]

(Embodiments) 10, 10a, 10b Liquid crystal display panel 12 Electrode terminal group 14, 16 Transparent electrode 20 First substrate 22 Second substrate 30 Connection substrate 40 Liquid crystal display device 42 Identification mark (connection substrate side) 50, 50a, 50b Identification mark (liquid crystal display panel side) (Modification) 60 Liquid crystal display device 62, 80 Liquid crystal display panel 66, 82 Identification mark (liquid crystal display panel side) 68 Electrode terminal group 70, 90 Connection board 72, 92 Identification mark (Connection board) side)

Claims (8)

[Claims] 1. A liquid crystal display panel having a pair of substrates facing each other with a liquid crystal interposed therebetween and a plurality of electrodes formed on the substrates, wherein the plurality of electrodes are formed on at least one of the pair of substrates, and An electrode terminal group to be connected; and an alignment mark formed near the electrode terminal group, for attaching a connection substrate to the substrate, which connects the electrode terminal group and a liquid crystal drive circuit for driving and driving the liquid crystal display panel. Wherein the alignment mark is an identification mark for identifying a panel model. 2. The liquid crystal display panel according to claim 1, wherein the identification mark has a unique shape for each panel model. 3. The liquid crystal display panel according to claim 1, wherein the identification mark has a shape corresponding to an alignment mark provided on the connection substrate. 4. The liquid crystal according to claim 3, wherein the identification mark is provided so that an outer shape of the identification mark partially matches an outer shape of a positioning mark provided on the connected substrate. Display panel. 5. The liquid crystal display panel according to claim 1, a display drive circuit for driving the liquid crystal display panel, an electrode terminal group included in the liquid crystal display panel, and the liquid crystal drive circuit. A liquid crystal display device, comprising: 6. The liquid crystal display panel according to claim 5, wherein the connection board is provided with an alignment mark for attaching the connection board to the liquid crystal display panel, and the alignment mark is of a model corresponding to the liquid crystal display panel. A liquid crystal display device comprising an identification mark for identifying a connection substrate. 7. The method for inspecting a liquid crystal display panel according to claim 1, wherein the step of detecting the identification mark is performed before the step of attaching the connection board to the liquid crystal display panel. Removing the liquid crystal display panel as a different type panel if the identification mark is determined to be different from the identification mark of the desired panel model. 8. A method for manufacturing a liquid crystal display device according to claim 5, wherein a step of selecting a desired liquid crystal display panel using the method for inspecting a liquid crystal display device according to claim 7. Attaching the connection substrate to the selected liquid crystal display panel.