JPS628128A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To prevent a spacer from moving when pressed or bent from outside, and to maintain the uniformity of cell thickness and to improve the display quality of contrast by using a composite body of a joining material and the spacer as a gap material. CONSTITUTION:A liquid crystal display body is constituted by scattering the joining material 7 which softens at certain temperature and join electrode substrates 1 and 2 and the spacer 6 which softens at the temperature, but fuses between the electrode substrates 1 and 2. This spacer 6 of this composite united type is extremely fine and has such size that neither trouble nor clogging is caused during viewing and the size is preferably a small submultiple - a small multiple of that of a liquid crystal layer in concrete. When a gap agent is spherical, the size is 1.3 - twice the cell thickness and when in a curved or straight rod shape, the diameter is 1.3 - twice the cell thickness. The gap agent softens or fuses by being heated, so it is preferable that the space is covered with the joining agent and the joining material projects by more than the spacer diameter.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a liquid crystal display device, particularly a liquid crystal display device using a flexible substrate such as a plastic panel, or a liquid crystal display device using a large screen display panel. This relates to liquid crystal layer gap management. In the present invention, the term "display device" includes not only a calculator, a dot matrix display, etc., but also a liquid crystal printer using a liquid crystal panel as an optical shutter.

[Prior art]

For example, instead of the conventional liquid crystal display device using a glass substrate, a lightweight, thin, and 7-lexible liquid crystal display device t: using a thin plastic film material has been proposed. Ordinary gap tube between upper and lower boards: The material uses thermosetting resin spacer elastic balls and thermoplastic resin balls (melted and fixed bonding material). However, a liquid crystal display device using the above-mentioned plastic film as a substrate material cannot be bent, for example.

When pressure is applied from the outside, it is difficult to make the cell thickness uniform, which causes problems with non-uniformity in contrast and response speed. Or, since a bonding material with approximately the same density as the spacer material is added to the spacer material and sprayed, it may be inconvenient during visual inspection.
This may cause an eyesore and significantly impair display quality.

[Problem to be solved by the invention]

The present invention is applicable to liquid crystal display devices that require constant cell thickness, particularly large-capacity liquid crystal display devices that require precise control of cell thickness, and liquid crystal display devices that use flexible materials, such as The purpose is to prevent the surface from moving when external compression or bending is applied, and to maintain uniformity in cell thickness and to satisfy the display quality of contrast.

[Means for solving problems]

The liquid crystal display device of the present invention includes a bonding member that softens or melts at a temperature higher than a certain temperature or is bonded to the electrode substrate by fusing or adhesion between the electrode substrates of the liquid crystal display, and a spacer that does not soften or otherwise undergo thermal deformation at that temperature. A composite and integrated product is used as a gap material. Such gap materials are scattered between electrode substrates by methods such as coating, scattering, dipping, and floating in the air.

The joining member composite integral spacer exists at least in the effective display area of the liquid crystal display. In addition to this, it may be present in the seal portion surrounding the liquid crystal or on the outside thereof. The electrode substrates are stacked on top of each other with a bonding material composite integral spacer interposed therebetween, and are heat-pressed at a constant temperature. The certain temperature is a temperature above which the bonding member softens or melts, and below which melts the electrode base material. Then, the bonded part softens and melts due to heat and pressure bonding, but the spacer material does not soften and change, and the space between the electrode substrates is held approximately at the diameter of the spacer, and the bonding member is bonded to the electrode substrate by adhesion or fusion, and the substrates are mutually connected. join.

[Example-1] The liquid crystal display of the embodiment of the present invention shown in FIG. A composite integrated type of a micro member 8 and a spacer 7 that does not soften or melt at that temperature is dispersed. Although such a composite integrated spacer is shown enlarged in a circle in the drawing, it is extremely minute.
The size is such that it does not cause any inconvenience or an eyesore when visually inspected.

Specifically, the thickness is preferably 17 to several times that of the liquid crystal layer.

If the gap agent is spherical, the curve is 1.3 to 2 times the cell thickness.
□The diameter of the wire or straight rod is 1.5 to 2 times the cell thickness. The electrode base material 1.2 is a glass substrate acrylic resin, etc.
In addition to a hard plastic base material configured to a predetermined thickness,
A flexible substrate is used. These materials are e.g.
Use a polyester resin, a resin, a phenoxy resin, a polyethersal 7-one resin, a merisal 7-one resin, a film made of acrylic resin, or a multilayered one of the above resins or films. . Furthermore, a reflective layer may be formed on the back surface of the flexible substrate by vapor deposition and sputtering of aluminum or silver. The thickness of such a substrate is approximately 1025-1.5%. Further, the plastic film may be coated with a polyvinylidene chloride resin or an acrylic resin.

Examples of the gap material in which the bonding material and spacer are combined and integrated for use in the liquid crystal display of the present invention include those in which the spacer is made of glass beads, glass fibers, inorganic metal powder, or microscopic plastic resin. Plastic resins used as bonding materials include acrylic resin, goryethylene resin,
Polystyrene resin, polyacetal resin, and boria resin.

Epoxy resin, silicone resin, phenoxy t1M
hW, griethersal7-one resin, polyethylene terephthalate resin, polyimide resin rumored thermoplasticity,
There are thermosetting resins. Since the gap agent softens or melts when heated, it can be of any shape, but preferably one in which the spacer is wrapped in a bonding agent or one in which the bonding material protrudes beyond the diameter of the spacer. In addition, as an example of the integration of the bonding material and the spacer, a cylindrical one (2nd m(fX))
There are also strip-shaped ones (second [(j)). Further, one or both of the electrode substrates may be a hard plastic plate or a glass plate.

[Example 2] In Example 1, an ultraviolet melting type resin is used as the bonding material and is scattered between the electrode substrates by a method such as plating, scattering and dipping.

〔effect〕 .

In the method for manufacturing a liquid crystal display of the present invention and the liquid crystal display manufactured by the method, a composite spacer and a bonding member having different thermal properties are scattered between the electrode base materials including the effective display area during heat compression bonding. The spacer acts as a gap agent to keep the distance between the electrode substrates constant, and the bonding material joins the electrode substrates to each other. For example, when external pressure or bending is applied, the spacer does not move and the cell thickness in the effective display area is kept uniform, highly accurate, and constant. Furthermore, since the gap agent is a composite gap agent, the density of the gap agent scattered therein is low, causing no inconvenience or eyesore when visually inspected. Furthermore, display quality is improved without causing non-uniformity in contrast or response speed within the effective display area.

[Brief explanation of drawings]

FIG. 1 is an explanatory view of an embodiment of the liquid crystal display of the present invention, (tL) is a plan view thereof, and (b) is a sectional view thereof. FIG. 2(α), Cb) is an explanatory diagram of another embodiment in which the bonding material and the spacer are integrated. 1.2... Electrode substrate 5... Sealing material 4... Mold 5... Liquid Crystal 6...Spacer 7...More than the bonding material part

Claims (1)

[Claims] 1. A liquid crystal display device in which a liquid crystal layer is sandwiched between a pair of electrode substrates with a gap material interposed therebetween, characterized in that the gap material is a composite of a bonding material and a spacer.