New method suitable for measuring chromaticity and photometric quantity of laser displays

P‐15.2: A Study for Easy and Quick White Balance Adjustment in Laser Display Production

“…In this chapter, we would like to explain how the DCWM can overcome the above challenges regarding white balance adjustment. Unlike spectrometers, it doesn't require laser spectrum measurement to obtain centroid wavelength as shown in [2]. Because of this characteristic, the necessary time for wavelength measurement has been sufficiently shortened.…”

“…As laser displays are becoming more common, the demand for accurate measurement of their chromaticity and photometric quantity is also rising. In our different study, reflecting this situation, we suggested a new measurement method called the Discrete Centroid Wavelength Method (DCWM) to precisely measure these two parameters using the centroid wavelength and the power P of RGB lasers as follows [2].…”

Evaluation of speckle of light-diffusion-fiber using laser light source

“…However, a thin optical fiber has a small light emitting area and a small amount of pixel data, so that it has been difficult to measure the speckle by the conventional method. [11][12][13][14][15][16] In order to obtain a highly accurate measurement value with small variations, the authors proposed a unique method for the measurement.…”

29.3: Photometric and Colorimetric Measurement of Ultra Short Throw Laser Projector

“…As ultra short throw laser projectors are becoming popular, the demand for accurate measurement of their chromaticity and photometric quantity is also rising. In our different study, we reported XYZ-filter illuminance color meters, which have been widely used to test the two parameters of displays in production lines so far, are not accurate enough for laser displays, and we developed a new measurement method named the Discrete Centroid Wavelength Method (DCWM) in order to allow an accurate evaluation of laser displays [2]. Leveraging this new method, we also developed RGB laser meters [3], which can simultaneously measure the centroid wavelength and radiometric quantity of RGB lasers, and proved their accuracy in laser measurement [4].…”