Patent ID: 11960101
Assignee: DAI NIPPON PRINTING CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 12:
13. 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.