Method for producing liquid crystal display

Abstract

A method for fabricating an LCD includes the steps of loading a first substrate having liquid crystal dropped thereon and a second substrate having sealant coated thereon on a bonding chamber, aligning the first and second substrates, bonding the first and second substrates with a varied pressure applied thereto, and unloading the bonded first and second substrates.

Description

[0001] This application claims the benefit of Korean Patent Application No. P2002-6656 filed in Korea on February 6, 2002, which is hereby incorporated by reference in this application. technical field [0002] The invention relates to a liquid crystal display, more precisely, relates to a method for making an LCD by using a liquid crystal dropping method. Background technique [0003] In summary, recent developments in the field of information communication have increased the demand for various display devices. In response to this demand, various flat panel displays have been developed, such as liquid crystal displays (LCDs), plasma display panels (PDPs), electroluminescence displays (ELDs), vacuum fluorescent displays (VFDs), etc., some of which Displays are used as displays in different devices. [0004] LCD has been most widely used as a mobile display, replacing CRT (cathode ray tube) due to its features and advantages such as excellent picture quality, light weight, t...

AI Technical Summary

Problems solved by technology

[0012] First, the production efficiency of the prior art method is low because, in order to inject the liquid crystal, it is necessary to immerse the liquid crystal injection port in the liquid crystal while keeping the gap between the two substrates in a vacuum state, which takes a lot of time.

[0013] Second, injecting liquid crystals into especially large-sized LCDs tends to cause incomplete perfusion of liquid crystals in the panel, which can lead to defective panels

[0014] Third, the complex and long-term fabrication process requires many liquid crystal injection devices, which take up a lot of space

[0025] First of all, applying sealant and dropping liquid crystal on the same substrate before the two substrates are bonded requires a long production time period

[0026] Second, while applying sealant and dripping liquid crystal to the first substrate, there is no action on the second substrate, so that the manufacturing process between the first and second substrates is unbalanced, which means that the working efficiency of the production line is very low. Low

[0027] Third, since the sealant is applied and the liquid crystal is dripped on the first substrate, the first substrate coated with the sealant cannot be cleaned by an ultrasonic cleaner (USC)

Therefore, since the sealant bonding the two substrates cannot be cleaned, particles that would cause poor contact with the sealant during bonding cannot be removed

[0028] Fourth, when aligning the two substrates so that the liquid crystal or sealant is in contact with the second substrate, the alignment film on the second substrate may be damaged, resulting in poor image quality

In addition, if the upper and lower tables cannot be leveled, it may cause partial contact between the first and second substrates with each other, thereby scratching the pattern on the opposite substrate, or making the sealant uneven

[0029] Fifth, aligning the two substrates only by changing the distance between the two substrates will limit the alignment accuracy of the two substrates

Images