JPH1048646A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device unnecessary for precisely positioning between two substrates by constituting so as not to display on at least one among plural conductive thin films formed in the X direction or Y direction. SOLUTION: An electrode/lead group of a translucent conductive film in an X direction and an electrode/lead group of the translucent conductive film in the Y direction are formed on a whole surface excepting a peripheral part. That is, the translucent conductive film is formed on a whole surface excepting the peripheral part on a substrate 1. Further, linear patterning is performed using excimer laser light 18. Further, by this patterning, one side electrode/lead group is arranged in the X direction, and the other side electrode/lead group is arranged in the Y direction. Thereafter, resin seal is performed so as to make the peripheral part a prescribed electrode interval while using a spacer. This resin for excepting an area of a liquid crystal and fixing a vertical electrode interval is sealed so as to cover too a part of the electrode/lead in the X direction or Y direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a liquid crystal display device and a method for manufacturing the liquid crystal display device. Especially,
The present invention relates to a microcomputer, a word processor,
Alternatively, the present invention relates to a simple matrix type liquid crystal display device for reducing the thickness of a display portion used in an electronic device such as a television and a method for manufacturing the liquid crystal display device.

[0002]

2. Description of the Related Art In a conventional liquid crystal display device, a transparent conductive film and an alignment film are provided inside two transparent substrates, respectively, and a liquid crystal is filled between them. Then, a voltage is applied between the two electrodes made of the transparent conductive film. At this time, “voltage presence” or “voltage direction” controls the liquid crystal to be transparent or opaque, and displays characters, graphs, or pictures on the liquid crystal display device. In this simple matrix type liquid crystal display device, the electrode / lead group in the X direction and the electrode / lead group in the Y direction are both manufactured using a photomask and a photoetching process using a photoresist. For this reason, an extremely precise photo-etching process has been used even for a very simple electrode / lead group of a simple matrix type.

For this reason, the fabrication of the electrodes and leads in the simple matrix system requires many steps, and as a result, an increase in the price of the entire panel is inevitable.
On the other hand, when manufacturing a liquid crystal display device by the simple matrix method, the present applicant applies a line-shaped laser beam having a very fine width (10 μm to 100 μm) to the entire surface except for the peripheral portion on the substrate. Irradiation was performed to selectively remove only the irradiated portion, and the remaining portion was used as an electrode / lead. If this simple matrix method is used, a photoresist coating process, a pre-baking process, an exposure process, a developing process, and a post-baking process are performed on the light-transmitting conductive film formed on the entire surface except for the peripheral portion on the substrate. Patterning can be performed without going through a step of etching, a step of etching a light-transmitting conductive film, and a step of removing a resist.

In the conventional method, the alignment between the electrode / lead group of the light-transmitting conductive film in the X direction and the electrode / lead group of the other light-transmitting conductive film in the Y direction is performed by positioning the substrate with the peripheral circuit. In connection with the flexible connector of the above, it was required to perform extremely precisely. For this reason, as shown by reference numeral (9) in FIG. 1, it is important to dispose electrodes and leads at the peripheral portion of the panel without contacting the sealing resin of the panel.

FIG. 1 is a longitudinal sectional view for explaining a conventional liquid crystal display device. In FIG. 1, a sealing material (6) in which a resin and a spacer are mixed with a resin member so that liquid crystal does not leak outside is provided around two transparent substrates (1) and (1 ') for liquid crystal display. Is provided to keep the distance between the two substrates constant. And a sealing material in which this resin and a spacer are mixed.
In (6), care is taken to never touch the electrodes / leads (2) and (2 '). If a part of the electrode is covered with a sealing material (6) in which a resin and a spacer are mixed, the part is not filled with the liquid crystal (5), and a non-displayable area is formed. For this reason, electrodes and leads (2)
, (2 ′) and a sealing material (6) obtained by mixing a resin and a spacer, the gap (9) between the ends is generally 3 to 5 mm.

[0006]

However, the above gap is
It was regarded as a margin in the manufacturing process, and was originally unnecessary at all to make the display portion larger. In addition, the connection between the electrode / lead and the printed circuit board (PCB) for the peripheral circuit has heretofore required extremely precise electrical bonding by bonding. However, in the precise wiring group, the leads are precisely arranged at intervals of several hundreds of μm, and each is connected to the electrode / lead of the liquid crystal display panel in a one-to-one correspondence. In addition, in the electrical isolation region, each electrode lead must have precise patterns aligned with each other to prevent electrical shorts with adjacent electrode leads. Such advanced technologies have led to lower manufacturing yields and higher manufacturing prices.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a part of a stripe-shaped conductive thin film formed on a substrate is covered with a sealing material in which a resin and a spacer are mixed. An object of the present invention is to provide a liquid crystal display device and a method for manufacturing the liquid crystal display device, which do not require precise alignment of two substrates.

[0008]

In order to achieve the above object, a liquid crystal display device according to the present invention comprises a plurality of conductive thin films formed on a first substrate in the form of stripes in the X direction; A plurality of conductive thin films formed in a stripe shape in the Y direction on the substrate, and a liquid crystal provided between the conductive thin film in the X direction and the conductive thin film in the Y direction. At least one of the plurality of conductive thin films formed in the direction or the Y direction is not displayed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention does not precisely align these upper and lower panels with a mask, but performs it completely blindly. For this reason, the electrode / lead group of the light-transmitting conductive film in the X direction and the electrode / lead group of the light-transmitting conductive film in the Y direction are in the peripheral portion (the opposite surface and The conductive film material is formed on the entire surface except for the peripheral portion in the sense of preventing the conductive material from flowing around the side. That is,
First, a transparent conductive film is formed on the entire surface except the peripheral portion on the substrate. Further, linear patterning is performed using excimer laser light according to the embodiment. Further, by this patterning, one electrode / lead group is provided in the X direction, and the other electrode / lead group is provided in the Y direction.

Thereafter, resin sealing is performed while using a spacer so that the peripheral portion has a predetermined electrode interval. As shown in FIG. 4, the resin for excluding the liquid crystal region and for keeping the upper and lower electrode intervals constant applies a part of the electrodes and leads located in the periphery of the electrodes and leads in the X direction or the Y direction. Is also sealed. This eliminates the need for precise alignment of the two panels in the present invention. However, it is important that the two panels have sufficient strength so that they do not peel off again after being bonded.

In this simple matrix system, the flexible wiring for connection to an external circuit is further provided with an X-direction electrode / lead group (corresponding to (30 ') in FIG. 4C) or a Y-direction. Electrode and lead group (Fig. 4 (C) shows (3
1 ')). By doing so,
A photo-etching step is no longer required to produce a simple matrix type electrode group. In addition, when the upper and lower panels are bonded, precise positioning is not required.

Furthermore, the connection between the printed circuit board (PCB) for the peripheral circuit configuration and the flexible wiring eliminates the need for precise alignment. As a result, it has become possible to completely prevent a decrease in reliability at a connection portion between the external circuit and the liquid crystal display device, which has been the most important cause of the decrease in reliability up to now.

[0013]

EXAMPLES The present invention will be described below with reference to examples. Example 1 FIG. 2 is a view for explaining an example in which patterning of a transparent conductive film required for manufacturing a liquid crystal display device of the present invention is performed without using a resist and using a photomask. FIG. 2 shows the laser processing of the present invention using an excimer laser for the optical system. The excimer laser (17) used a wavelength of 248 nm and Eg = 5.0 eV.
Then, the initial light beam (18) has a size of 16 mm × 20 mm and has an efficiency of 3%, and thus has 350 mJ. further,
This light beam (18) is expanded or expanded in area by a beam expander (16), that is, 16 mm × 300 m
m (Fig. 2 (11)).

In this apparatus, 5.6 × 10 ^-2 mJ / mm ² was obtained at an energy density. Furthermore, when a synthetic quartz cylindrical lens (14) was used and the groove width on the processing surface was not using a mask, the light was condensed (12-1) so as to be 100 μm. A quartz plate (13) was used as a mask. Chrome, Mo
Si ₂ such as heat-shielding material (13 ') is selectively provided, constitutes a mask. Here, a part of the light beam (12-2) is selectively selected from the light condensing (12-1), and the selected light beam is applied to the surface to be processed (2).

Thus, the slit-shaped light beam (12-2) having a length of 30 cm and a width of 20 μm is linearly irradiated on the workpiece (2) on the substrate (1), and the groove (8) is formed. It is formed. A substrate (1) having a transparent conductive film (Eg = 3.5 eV) on glass as a surface to be processed was subjected to an excimer laser (manufactured by Questec Inc.).
Was used. The pulse light was KrF at 248 nm. Since the optical energy bandwidth was 5.0 eV, the pulsed light was sufficiently absorbed. This is because pulsed light can selectively process only the transparent conductive film.

The pulse width is 20 ns and the repetition frequency is 1 H
z to 100 Hz, for example, 10 Hz, and the workpiece is
Tin oxide (STF), a transparent conductive film (CTF) on a glass substrate
nO ₂₎ was used. When this coating was processed, the groove (8) was completely opaque by the irradiation of the linear pulse light only once, and the light-transmitting conductive film (CTF) became fine powder. This is ultrasonically cleaned with an aqueous acetone solution (frequency 29 KHz) for about 1 minute to 10 minutes.
Then, the light-transmitting conductive film (CTF) was removed. The underlying soda glass was not damaged at all.

FIG. 3 is a diagram for explaining the state of the laser beam light in FIG. That is, the state irradiated with the laser light is a rectangle (18) shown in FIG. This is enlarged (11) in the length direction by an expander, and FIG.
Obtain a long rectangle as shown in FIG. Further, the laser light is partially removed from the periphery (12-1) of the laser light by the photomask, and an extremely fine groove (12-2) is formed as shown in FIG. The beam light width (12-1) was 100 μm, and the width (12-2) of the beam partially shielded by the mask was 20 μm.

At this time, FIG. 3C-1 is obtained by simply selecting only the central portion with a mask. In addition, when the end is thickened, FIG.
-2) is obtained. In this drawing, there is no mask at the end. FIG. 3 (C-3) shows that the thickness and the shape are defined by the mask while the end is made thicker. Fig. 3 (C-3)
Is easier to understand than Figures 3 (C-1) and (C-2)
The drawing is enlarged. By repeating this work,
The simple matrix type electrode / lead group shown in FIGS. 4 (A-1) and 4 (A-2) can be obtained.

Embodiment 2 FIG. 4 is a view for explaining an example in which a liquid crystal display device is manufactured by using an electrode / lead group using the transparent conductive film obtained in Embodiment 1. FIGS. 4A-1 and 4A-2 have a pair of glass substrates (1) and (1 '). It has an X-direction electrode / lead (2 ') and a Y-direction electrode / lead (2') inside. The pair of panels is set at a constant interval, and the peripheral portion is sealed with a sealing material (6) in which a resin and a spacer are mixed. The sealing material (6) in which the resin and the spacer are mixed is used not only in the vicinity of the glass substrates (1) and (1 ') but also in the upper surfaces of some of the electrodes (30-
1), (30-2)
(1) and (1 ') are fixed close to each other.

In FIG. 4, a sealing material (6) in which a resin and a spacer are mixed covers a part (30-1), which is the entire end of the electrode / lead in the Y direction. FIG. 4C is a plan view showing this state. As is clear from FIG. 4, here, the electrodes and leads (3
0-3) and the electrodes / leads (31-3) in the X direction are not used to secure a margin. The electrodes and leads used directly for display are the areas indicated by reference numerals (30 ') and (31').
That is, the electrodes and leads in this area were connected to a printed wiring board (PCB) provided with peripheral circuits by a flexible wiring (not shown). Due to the error in the wiring alignment accuracy, one unused electrode / lead (30-3)
(31-3) Yes, but this can be absent or two or more.

[0021]

According to the present invention, as described above,
Patterning of the transparent conductive film formed on the transparent substrate was performed by a line scribe process using excimer laser light using a resistless process. Therefore, the patterning of the conductive film formed on the translucent substrate is inexpensive. However, it was also found that the simple matrix type liquid crystal display device of the present invention does not cause any disadvantage as to the inability to have an arbitrary shape which is regarded as a disadvantage in this step. Further, as described in the first embodiment, a part of the electrodes and leads in the peripheral portion was covered with the resin sealing material in the peripheral portion, and the operation was performed. This eliminates the need for precise alignment of the two panels.

According to the present invention, it is not necessary to precisely align the effective electrode and lead display formed in a simple matrix in the X and Y directions with an external circuit. Of course, it is effective to reduce the cost by mounting an integrated circuit (IC) on-chip (attached as a chip) around the transparent substrate.

According to the present invention, in a pair of electrodes / leads or a transmissive liquid crystal display device, it is effective to make both of them translucent. On the other hand, in a reflection type display device, the reflection surface can be an electrode / lead closely contacting one liquid crystal. In such a case, only one polarizing plate may be used, and the cost can be reduced. In this case, it is preferable that one of the electrodes and leads is formed of a light-transmitting conductive film and the other is formed of a reflective metal. In the liquid crystal display device of the present invention, an alignment film and a liquid crystal are filled between a pair of electrodes, and a color filter can be incorporated as needed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view for explaining a conventional liquid crystal display device.

FIG. 2 is a view for explaining a patterning of a transparent conductive film necessary for manufacturing the liquid crystal display device of the present invention, which is performed without using a resist and using a photomask.

FIG. 3 is a diagram for explaining a state of laser beam light in FIG. 2;

FIG. 4 is a diagram for explaining an example in which a liquid crystal display device is formed by an electrode / lead group using a transparent conductive film obtained in Example 1.

[Explanation of symbols]

 1, 1 ': glass substrate 2, 2': electrode and lead 5: liquid crystal 6: sealing material in which resin and spacer are mixed 8: open groove 9: gap 11, 12,18 ・ ・ light beam 14. ・ cylindrical lens 16. ・ beam expander 17. ・ excimer laser

Claims (1)

[Claims] 1. A plurality of conductive thin films formed in a stripe shape in an X direction on a first substrate, and a plurality of conductive thin films formed in a stripe shape in a Y direction on a second substrate. A liquid crystal display device comprising: a liquid crystal provided between the conductive thin film in the X direction and the conductive thin film in the Y direction; wherein the plurality of conductive thin films formed in the X direction or the Y direction Wherein at least one of the liquid crystal displays is not displayed.