Technical Information
Fine Cleaning Technologies

Liquid Crystal Panel Cleaning Using Micro-Emulsion Technology

1. What is Involved in Liquid Crystal Panel Cleaning?

The liquid crystal used in a liquid crystal panel is sandwiched between two glass substrates. Looking at this structure, the pair of substrates contain the liquid crystal above and below within a dam of sealing material that leaves a gap (3µm deep and 300 to 500µm wide) around the edge, which outlines an area slightly larger than what is necessary for the screen display, and it is into this gap that excess liquid crystal inevitably spills during the production process. The excess liquid crystal must be removed because it causes electrical corrosion and, eventually, short circuits when electric current is applied.

image:What is Involved in Liquid Crystal Panel Cleaning?

2. The Features of Lion’s Detergent for Liquid Crystal

Conventional liquid crystal cleaning methods use solvent-based detergents that feature superior liquid crystal solubility or a quasi-aqueous detergent that mainly consists of solvents and contains a small amount of water for preventing flammability. Just like solvent-based detergents, however, quasi-aqueous detergents could potentially become flammable if the water evaporates due to heating. Moreover, conventional detergents are hard to rinse away because of they are primarily solvent-based.
Lion's liquid crystal detergents, on the other hand, consist mainly of water and therefore possess no flammable properties. Posing minimal threat to human health and environmentally friendly, they are also easily rinsed away. Moreover, these detergents boast the groundbreaking feature of forming a micro-emulsion in water thanks to the optimal blending of surfactants, penetrating agents and solubilizers.

image:The Features of Lion's Detergent for Liquid Crystal

With superior penetrability and solubility, our micro-emulsions can instantly penetrate the extremely narrow gap along the edges and between the glass substrates sandwiching the liquid crystal material, attaining a lasting solubilization of excess liquid crystal. Lion's micro-emulsion detergents have been proven to display stronger cleaning ability in a shorter amount of time than any conventional solvent-based detergent.

image:Cleaning using a conventional solvent-based detergent

Cleaning using a conventional solvent-based detergent

image:Cleaning using a conventional solvent-based detergent

Cleaning using a Lion micro-emulsion-type aqueous detergent

3. The Lineup and Applications of Lion’s Liquid Crystal Detergents

We offer a variety of detergents suited for high-definition active panels (TFT liquid crystal panels) and passive panels for general purposes (STN liquid crystal panels).

List of Lion's primary liquid crystal detergents
  LH-8500 LH-6000 LH-9000 LH-540
Features Suitable for TFT LCPs Suitable for STN LCPs Suitable for both TFT and STN LCPs Suitable for cleaning after rubbing
Appearance Colorless transparent liquid Colorless transparent liquid Colorless transparent liquid Colorless or pale yellow liquid
pH 7.3(Liquid concentrate) 7.5(Liquid concentrate) 8.0(Liquid concentrate) 4.0~5.0(Liquid concentrate)
Viscosity(mPa・s/25℃) 9(Liquid concentrate) 8(Liquid concentrate) 5~25(Liquid concentrate) 20~30(Liquid concentrate)
Surface tension(Liquid concentrat,mN/m) 26.6 25.8 25.3 27.6
BOD(Liquid concentrate,g/L) 102 1,060 711 7
COD(Liquid concentrate,g/L) 168 103 163 260