Coating method for liquid crystal alignment film of tft-lcd

a liquid crystal alignment and coating technology, applied in the direction of semiconductor devices, instruments, electrical devices, etc., can solve the problems of large consumable consumption, cumbersome equipment, poor mobility, etc., and achieve the effect of effective control of the precision of the printing of the alignment film
US20130122621A1Active Publication Date: 2013-05-16TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
4 Cites 2 Cited by

Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
Publication Date
2013-05-16

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

A coating method for liquid crystal alignment film of TFT-LCD including: forming a layer of hydrophobic film on a TFT / CF substrate corresponding to a non-display area, the hydrophobic film separates the TFT / CF substrate into a plurality of rectangular opened areas which are separated from each other, each of the rectangular opened areas corresponds to a display area and its outer frame is formed by the hydrophobic film; and coating of a liquid of a material of an alignment film along a boundary of the rectangular opened area. Accordingly, edge waves caused by spreading of drips of the material of the alignment film can be reduced, so that a precision of printing of the alignment film can be controlled effectively.
Need to check novelty before this filing date? Find Prior Art

Description

FIELD OF THE INVENTION

[0001] The present invention relates to a manufacturing technique of liquid crystal display device and more particularly to a coating technique for liquid crystal alignment film of LCD.BACKGROUND OF THE INVENTION

[0002] PI (polyimide) film is a layer of even alignment film on a surface of TFT (Thin Film Transistor) substrate and CF (Color Filter) substrate, it makes liquid crystal molecules to be arranged according to a certain pre-tilt angle in order to control a passing direction of light, and achieve a display purpose by applying an appropriate driving voltage. Currently, there are mainly two coating methods of coating technique for PI film: PI roller coating and PI inkjet.

[0003] Referring to FIG. 1, a process for transfer-printing technique mainly includes: a polyimide (PI) solution is ejected from a PI nozzle 4 and it drips on a turning metal roller 3, a scraper 5 is used to scrape excessive PI solution, the metal roller 3 turns and is in contact with a plate ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More