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Liquid crystal display cell, process for its production and cell plate
| Details |
Inventors: Kaufmann, Meinolph;
Assignee: BBC Brown, Boveri & Company Limited (Baden, CH)
Primary Examiner: Punter; William H.
Assistant Examiner:
Attorney, Agent or Firm: Oblon, Fisher, Spivak, McClelland & Maier
A fluid crystal display cell (1) which has 2 cell plates coated with electrodes (14, 15) which include a fluid crystal mass (5). The first cell plate (1) is transparent and the second cell plate (2) is equipped with an adhesive cell interior reflector layer (9), at least in some regions, which contain the flake-like aluminum particles (6) as reflector particles and a bonding phase for this. The bonding phase is a practically homogeneous, transparent layered mineral matrix (7), consisting almost primarily of SiO.sub.2, in which the aluminum particles (6) are imbedded. |
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DETAILED DESCRIPTION An object of this invention is to provide an LC-display cell of the afore-mentioned type in which the reflector layer adheres solidly to the cell plate, is sufficiently thin and wipe-resistant and the flake-like aluminum particles are insulated electrically from each other with sufficient mass.
Another object of this invention is to provide a process for the production of an LC-display cell with the aforementioned properties.
These and other objects have been achieved by providing a practically homogeneous, transparent and layer-like matrix consisting largely of SiO.
sub.
2, in which the aluminum pigmet particles are imbedded, serving as a bonding phase for the aluminum pigment particles of the reflector layer in the LC-display cell.
The reflector layer usually has a medium thickness of 0.
3 to 5 .
mu.
m, preferably of 0.
5 to 1 .
mu.
m, and consists preferably of SiO.
sub.
2 constituting at least 20% of its weight and the remainder consists practically totally of the scale-like aluminum particles.
Surprisingly it was found that such a reflector layer can be obtained in a simple and inexpensive fashion by the fact that a fluid, organic orthosilicate with the formula ##STR1## is added at normal temperature to a pre-mixture or to the mixture used for applying the aluminum particles to the corresponding cell plates, in which R.
sup.
1, R.
sup.
2, R.
sup.
3, and R.
sup.
4 are the same or different organic remainders, preferably alkyl remainders with 1 to 4 carbon atoms each, especially ethyl remainders which are evanescent in the form of the corresponding hydroxyl compounds (i.
e.
, as R.
sup.
1 OH, R.
sup.
2 OH, R.
sup.
3 OH and R.
sup.
4 OH) (boiling point of a maximum of 150.
degree.
C.
); the organic orthosilicate is hydrolisized before, during or after the application of the mixture, which occurs generally in the acidolytic fashion, i.
e.
, in the presence of an acid.
For best results, a volatile mineral acid, such as concentrated hydrochloric acid, is used and is added to the mixture or to the pre-mixture
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LCD 
