LCD segment screen photolithography is bad---floating glue

晶拓

LCD segment screen photolithography is bad---floating glue [Copy link]

Floating glue is an undesirable phenomenon that often occurs during the development or etching process, and it is also a photolithography defect that has a relatively serious impact. Floating glue produced during development During development, the glue film on the glass surface wrinkles like orange peel or large pieces of the glue film peel off. This phenomenon indicates that the glue film and the ITO layer on the glass surface do not adhere well, and the cause must be carefully found. At the same time, the glass with problems must be reworked.

The reasons for floating glue during development are generally: 1) Improper cleaning of the glass surface before glue coating, with oil stains, no steam, etc. on the surface, or the glass is left in the air for too long after cleaning, and the water vapor in the air adheres to the glass surface; or the humidity in the coating operation environment is too high, causing poor adhesion between the glue and the glass surface. Therefore, attention should be paid to the cleaning of the glass surface and the temperature, humidity and cleaning of the operating environment. 2) The photoresist is incorrectly prepared or the glue is old and impure, the photochemical reaction performance of the glue is not good, the glue and the ITO layer have poor bonding ability, or the glue film is uneven and too thick, causing poor adhesion. 3) Insufficient or excessive pre-baking time. If the baking time is insufficient, the solvent in the film cannot evaporate in time, and part of the film is dissolved during development; if the baking time is excessive, the film will warp and harden, and the photosensitive properties of the film will change. Therefore, the pre-baking should be appropriate. 4) Insufficient exposure, the photohardening reaction is not complete, the film is dissolved in the developer, and the film floats. Therefore, under the premise of ensuring resolution, the exposure should be sufficient. 5) The development time is too long, and the developer continuously penetrates from the bottom of the film, causing the film to float. Therefore, the development time must be controlled. This content is originally created by Jingtuo, a netizen of EEWORLD forum. If you need to reprint or use it for commercial purposes, you must obtain the author's consent and indicate the source

dfwisdom

I have learned a lot. Could you please introduce more about the failure modes of LCD and the analysis of the existing quality problems? Thank you.

晶拓

dfwisdom posted on 2018-11-23 08:40 I have learned a lot. Could you please introduce more about the failure modes of LCD and the analysis of the existing quality problems? Thank you

OK OK I will write more about this aspect.