LCD Cell Gap Measurement
RETS series

Cell gap measurement for LCD cell (Reflection type & Transmission type) and empty cell with color filter
Measurement Targets
  • LCD Cell
  • Optical Material
Measurement Items
  • Filled cell gap
  • Twist angle
  • Rubbing angle
  • Pretilt angle
  • Empty cell gap
  • Retardation dispersion
  • Optical axis
  • Ellipticity/ Azimuth angle
  • Three-dimensional refractive index
  • Spectrum / chromaticity
Features
  • Polarization Optical System and Array Spectrometer
  • Measures various size of samples (from 1mm optical element to 10th generation large LCD panels)
  • Complying LCD production requirement for safety measure and dust prevention

Spectroscopic Characterization Instrument About the
RETS series

Cell gap measurement for LCD cell (Reflection type & Transmission type) and empty cell with color filter

Measurement Items

Filled cell gap

Twist angle

Rubbing angle

Pretilt angle

Empty cell gap

Retardation dispersion

Optical axis

Ellipticity/ Azimuth angle

Three-dimensional
refractive index

Spectrum / chromaticity

Measurement Targets

LCD Cell

  • Transmission type (TFT, TN, STN, IPS, VA, OCB, ferroelectric)
  • Reflection type (TFT,TN,IPS,VA)

Optical Material

  • Other (retardation / ellipticity / polarization film,LC material)

Specifications

Model

RETS series

Sample size

20 mm × 20 mm to *
Measurement range
(cell gap)
0.1 μm to several 10 μm
Measurement reproducibility
(cell gap)
±0.005 μm
Detector Array spectrometer
Wavelength 400 nm to 800 nm
Polarizer unit

Polarization optics
Extinction ratio 10-5 (Glan-Thompson prism)
Automatic rotation (Angle accuracy 0.1°)

Spot size φ2, φ5, φ10 (mm)
Tilt mechanism for optic axis -20 to 45°, -45 to 45°other


* Measures various size of samples(over 2000 mm×2000 mm)

Measurement Examples

Retardation dispersion at each wavelength and cell gap

Retardation dispersion at each wavelength and cell gap

Distribution data in the gap surface

Distribution data in the gap surface

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