Optical measurement device and optical measurement method

An optical measurement method comprising the steps of:

• capturing an image of emitted light by focusing the emitted light on a two-dimensional sensor array surface with an optical system, the emitted light being emitted from a measurement surface of a light emitting electronic display or a light emitting surface of which a sparkle contrast is to be measured;
• and
• calculating the sparkle contrast based on the captured image of the emitted light,
• wherein the step of calculating the sparkle contrast is performed based on the image of the emitted light captured under an imaging condition under which a size of a light-emitting region on the measurement surface is constant, the light-emitting region contributing to formation of a diffraction limited spot of the emitted light on the two-dimensional sensor array surface, and
• wherein the size of the light-emitting region is determined based on a size of the diffraction limited spot and a magnification of the optical system determined by a focal length of the optical system and an imaging distance from the measurement surface to the optical system.