JPH059774B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method for manufacturing a liquid crystal display using a glass substrate and easy to manufacture.

(b) Prior art In general, a liquid crystal display has an electrode 1 as shown in Figure 1.
The liquid crystal 18 is sandwiched between the two substrates 11, 11 having the electrodes 13, 13, but since the shapes of the electrodes 13, 13 form picture elements (pixels), the liquid crystal 18 is sandwiched between the two substrates 11, 11.
1 and 11 must be pasted together with high precision. Therefore, conventionally, the electrode 13, Along with patterning No. 13, alignment marks were patterned within the display device, and the bonding work was performed in accordance with the alignment marks.

(c) Problems to be solved by the invention However, in recent years, as improvements in display quality have been required,
A specification has been issued stating that it is better for the electrodes 13, 13 to be invisible when not lit, and this is generally due to a conflict between the material of the electrodes 13, 13 and the refractive index of the alignment films 16, 16 of the liquid crystal. It satisfies me. Therefore, although the alignment marks are arranged outside the area shown to the observer as a display surface (so-called effective display surface) when incorporated into a device, etc., the alignment marks 16, 16 located within the display device, etc. It is extremely difficult to identify the object because it is covered with dust and there is a lot of light scattering. This is not only because the shape of the alignment mark cannot be distinguished, but because both substrates are transparent and the gap between them (thickness of the liquid crystal layer) is narrow, it is difficult to tell which substrate the mark is on, and the workability of bonding is poor. also means
Furthermore, if the sealing materials 19, 19 are placed at the positions of the peripheral sealing materials 19, 19, although there is almost no alignment film, the sealing materials 19, 19 are in an uncured state during a process that requires positioning work, and are opaque, which is impractical.

(d) Means for solving the problem The present invention has been made in consideration of the above points, and
This process involves providing alignment marks that indicate the bonding and cutting positions in line with the rows of terminal electrodes so as not to cover them with the alignment film, and laminating and cutting display substrates based on these alignment marks.

(e) Effect This makes it easy to identify aligned terminal rows even on a transparent glass substrate, so alignment marks that are in the same line as the terminal row and without an alignment film can be identified even when the glass is laminated. Since there is a direct air layer between them, the positional relationship in the thickness direction can also be determined.
In addition, this glass substrate is cut based on this easy-to-identify alignment mark to expose the terminals.
After manufacturing, the alignment mark is not noticeable to the display viewer, and since one mark is missing, alignment with other parts is also possible.

(f) Embodiment FIG. 2a is a plan view of a liquid crystal display substrate for explaining an embodiment of the present invention, and FIG. 2b is a sectional view for explaining the bonded state thereof. In the diagram, 1 is 4
A glass substrate for manufacturing panels at once.
The same material as shown in Fig. 2a is turned over and pasted together as shown in Fig. 2b, and then cut and separated along cutting lines A, B, etc. to obtain 4 panels. (Liquid crystal is then injected into each panel to form a liquid crystal display.) Therefore, two sets of upper electrodes and two lower electrodes are alternately provided on this glass substrate. 2, 2... are the electrodes made of transparent electrode material, display electrodes 3, 3..., lead electrodes 4, 4...,
Terminal electrodes 5 aligned with the edges of the main surface during display formation,
It consists of 5... 6, 6, . . . are alignment films provided at least in the above-mentioned effective display area. 7,7
. . . is an alignment mark made of a transparent electrode material provided in substantially the same row as the terminal electrodes 5, 5 . . . and has a checkered pattern shape, for example.

In the above structure, the terminal electrodes 5, 5... need to be exposed because they are connected to an external drive means after the display is formed, and because they are arranged at relatively wide intervals, transparent materials (glass, membrane) are required. Focusing on the fact that they are easy to identify even in a stacked state, alignment marks 7, 7, . . . are provided in the same row positions. It is more preferable that the alignment marks 7, 7 . When a plurality of panels are efficiently manufactured at once from one panel as in this example, the terminal portion of the panel located in the center overlaps between the upper glass substrate and the lower glass substrate, and the cutting positions A and B are shifted. Therefore, the positioning marks 7, 7, . . . serve as position identification marks 7, 7, .

(G) Effects of the Invention As described above, the present invention performs bonding and cutting using a liquid crystal display substrate in which an alignment mark is provided in approximately the same line as the terminal electrodes aligned at the end of the main surface of the glass substrate. Therefore, the alignment marks can be easily identified even on a substrate whose pattern is made inconspicuous by an alignment film or the like, and manufacturing operations such as bonding and cutting operations are facilitated. Furthermore, since the terminal is cut based on this alignment mark and the terminal is exposed, the alignment mark is not noticeable to the display viewer after manufacturing.
Since there is no mark on one side, it is also possible to align it with other parts.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a liquid crystal display, FIG. 2a is a plan view of a substrate for a liquid crystal display according to an embodiment of the present invention, and FIG. 2b is a sectional view illustrating a bonded state thereof. 1... Glass substrate, 2, 2... Electrode, 3, 3...
...Display electrode, 4,4... Lead electrode, 5,5...
Terminal electrode, 6, 6... alignment film, 7, 7... alignment mark.

Claims (1)

[Claims] 1. On the main surface of the glass substrate, electrodes including aligned terminal electrodes, alignment marks arranged in substantially the same line as the terminal electrodes, and an alignment film on at least the effective display area excluding the area where the terminal electrodes and alignment marks are located. and a step of bonding two such display substrates to each other based on alignment marks, and cutting the substrate based on the alignment marks. A method for manufacturing a liquid crystal display device characterized by: