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D-type Homogeneous & Homeotropic Cells
Instec stocks many different configurations of D-type cells. A list of those currently in stock can be found here. Specifications can be determined from the part numbers according to the following metric.
S  aaa A  dddu  G  φφφ
(1)     (2)    (3)       (4)       (5)      (6)
(1) Cell configuration: S means the contacts for electrodes on both the top and bottom substrate are on the bottom substrate. D means the contacts are on the same substrate as their electrode (thus one contact faces up and the other down). SG and DG mean respectively an S-type or D-type cell with an additional guarding electrode.
(2) Active ITO area in mm2: Currently, Instec has tooling for aaa=100 (10x10 mm) and 025 (5x5 mm) for S-type cells, and aaa = 256 (16x16 mm) and 400 (20x20 mm) for D-type cells.
(3) Glass type: A type cells use Soda-lime glass; T type cells use BK7 glass (TFT quality); and Q type cells use quartz.
(4) Average cell gap: dddu indicates a cell gap of dd.d μm. Instec offers cell gaps ranging from 3.3 μm up to 22 μm.
(5) Alignment layer: G indicates homogeneous (or planar) alignment layer, mainly for Positive NLC or FLC. Cells with a homogeneous alignment layer have a 1° to 3° pretilt angle from the plane of the substrate. T indicates homeotropic (or vertical) alignment layer. Cells with a homeotropic alignment layer have a 1° to 3° pretilt angle from the substrate normal.
(6) Rubbing direction: φφφ specifies the rubbing angle between the bottom and top substrates. Rubbing angles of ~000 mean parallel rubbing, ~180 mean anti-parallel rubbing, and ~090 mean 90° twist rubbing. When G φφφ is replaced with NOPI, the cells have no alignment layer.
Technical Specifications
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