LCD cell gap measurement

RETS series

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RETS series

RETS series is for cell gap measurement of LCD cell(reflection type & transmission type) and empty cell with color filter

#TFT, TN, STN, IPS, VA mode cell gap, retardation measurement, system(gen. 1 ~ gen. 10.5), LCD cell

  • 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 measurement and dust prevention

Sample size*20mm x 20mm
Measurement range(cell gap)0.1μm ~ tens of 10μm
Measurement reproducibility±0.005μm
Detectorarray spectrometer
Wavelength400nm ~ 800nm
Polarizer unitpolarization optics
extinction ratio: 10^-5(Glan-Thompson prism)
automatic rotation(angle accuracy: 0.1°)
Spot sizeφ2, φ5, φ10(mm)
Tilt mechanism for optic axis-20 ~ 45°, -45 ~ 45° other

*measures various size of samples over 2,000mm x 2,000mm

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

Measurable samples
  • 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)

Retardation dispersion at each wavelength and cell gap

Distribution data in the gap surface