Chromaticity measurement method and device for calibrating LED splicing display

Abstract

The application relates to a chromaticity measurement method and device for calibrating an LED splicing display screen, and relates to the technical field of colorimeters. The method includes the following steps: using an objective lens to image the outgoing light of the LED splicing display screen; using a partially transparent The partially reflecting lens receives the beam from the objective lens and splits the beam to obtain the first beam and the second beam; uses the imaging sensor to receive the first beam to obtain the original image; uses the movable fiber array coupling device to receive the second beam in the form of a two-dimensional lattice The light beam is converted into one-dimensional lattice light; the spectrum acquisition device is used to obtain the chromaticity information and spectral information of multiple areas on the LED splicing display screen according to the one-dimensional lattice light. The present application separates outgoing light, uses an imaging sensor for analysis, uses a spectrometer for chromaticity measurement and spectral measurement, and calibrates and corrects the imaging sensor based on the measurement results of the spectrometer, which has the advantages of convenient operation and accurate measurement.

Description

technical field [0001] The present application relates to the technical field of colorimeters, in particular to a colorimetric measurement method and device for calibrating LED splicing display screens. Background technique [0002] GaN (Gallium Nitride) and other inorganic LEDs (Light Emitting Diode, Light Emitting Diode) have the advantage of a longer service life, but due to their narrow emission spectrum, it is difficult for the semiconductor process to ensure that the central spectral line and spectral width are completely consistent, resulting in The color is easy to deviate when it is a large display screen, and color adjustment is required. The premise of the adjustment of selected colors is accurate color measurement, and the large LED display screen is composed of multiple display screens, and the spectrum of each display screen is quite different. [0003] At this stage, one situation is a rotary imaging colorimeter using XYZ filters, but due to the poor accuracy...

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Problems solved by technology

[0002] GaN (Gallium Nitride) and other inorganic LEDs (Light Emitting Diode, Light Emitting Diode) have the advantage of a longer service life, but due to their narrow emission spectrum, it is difficult for the semiconductor process to ensure that the central spectral line and spectral width are completely consistent, resulting in The color is easy to deviate when it is a large display screen, and color adjustment is required

The premise of the adjustment of selected colors is accurate color measurement, and the large LED display screen is composed of multiple display screens, and there are large differences in the spectrum between each display screen.

[0003] At this stage, one situation is a rotary imaging colorimeter using XYZ filters, but due to the poor accuracy of XYZ filters and the narrow spectral lines of LEDs, the measurement error is relatively large; the other In the second case, the spectral information of the central point is measured by a single-point spectrometer, and the central point is used for calibration, but the spectra of other areas cannot be conveniently measured, which leads to large measurement errors in other areas except the central area

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