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CN-121978064-A - Light transmittance detection method and system for optical film

CN121978064ACN 121978064 ACN121978064 ACN 121978064ACN-121978064-A

Abstract

The application relates to the technical field of light transmittance detection, in particular to a light transmittance detection method and system of an optical film, wherein the method comprises the steps of selecting a standard sample of the optical film, scanning the standard sample with a preset first resolution, and obtaining the light transmittance and the haze of the standard sample at each measuring point; the method comprises the steps of firstly carrying out primary global scanning on an optical film to be detected with a preset second resolution, obtaining the light transmittance and the haze of the optical film to be detected at each measuring point in the first scanning to determine an abnormal evaluation value of a local area and screening out the abnormal area, carrying out secondary scanning on the abnormal area with the preset first resolution, and generating a light transmittance distribution map and a haze distribution map which cover the whole optical film to be detected based on the light transmittance and the haze of all measuring points corresponding to the secondary scanning to detect the light transmittance of the optical film to be detected. The application obviously improves the detection efficiency while ensuring the detection precision, and effectively improves the overall performance and reliability of the optical film detection.

Inventors

  • SUN PAN
  • CHEN SHENGLIANG

Assignees

  • 上海精珅新材料有限公司

Dates

Publication Date
20260505
Application Date
20260327

Claims (9)

  1. 1. A method for detecting light transmittance of an optical film, comprising the steps of: Selecting a standard sample of the optical film, and scanning the standard sample with a preset first resolution to obtain the light transmittance and the haze of the standard sample at each measuring point; Executing a multi-stage scanning strategy for an optical film to be tested, wherein the strategy comprises the following steps: firstly, carrying out primary global scanning on an optical film to be detected at a preset second resolution, and obtaining the light transmittance and the haze of the optical film to be detected at each measuring point in the primary scanning; Calculating abnormal evaluation values of the local areas where the measuring points are located through the deviation degree of the variation fluctuation of the light transmittance and the haze of all the measuring points in the local areas where the measuring points are located after the first scanning relative to the standard sample so as to screen out the abnormal areas; And performing secondary scanning on the abnormal region with a preset first resolution, and generating a light transmittance distribution map and a haze distribution map which cover the whole optical film to be detected based on the light transmittance and the haze of all measuring points corresponding to the secondary scanning so as to detect the light transmittance of the optical film.
  2. 2. The method of claim 1, wherein the predetermined first resolution is greater than the predetermined second resolution.
  3. 3. The method for detecting light transmittance of an optical film according to claim 1, wherein a calculation process of the abnormality evaluation value is: Analyzing the deviation ratio of the light transmittance discrete degree of all the measuring points in the local area of each measuring point after the first scanning relative to the light transmittance discrete degree of all the measuring points on the standard sample, and calculating the relative fluctuation degree of the light transmittance; analyzing the deviation ratio of the degree of dispersion of the haze of all the measuring points in the local area where each measuring point is located after the first scanning relative to the degree of dispersion of the haze of all the measuring points on the standard sample, and calculating the relative fluctuation degree of the haze; and selecting the maximum value of the relative fluctuation degree of the light transmittance and the relative fluctuation degree of the haze as an abnormal evaluation value of the local area where each measuring point is located.
  4. 4. The method for detecting light transmittance of an optical film according to claim 3, wherein the calculation process of the relative fluctuation degree of light transmittance and haze is as follows: The discrete degrees of the light transmittance and the haze at all the measuring points in the local area are respectively recorded as the local fluctuation degree of the light transmittance and the local fluctuation degree of the haze; Aiming at the positions of all measuring points of the optical film to be measured in the first scanning process, respectively calculating the discrete degrees of light transmittance and haze at the measuring points of the corresponding positions in the standard sample, and respectively recording the discrete degrees as the overall fluctuation degree of the light transmittance and the overall fluctuation degree of the haze; taking the ratio of the local fluctuation degree of the light transmittance to the overall fluctuation degree of the light transmittance as the relative fluctuation degree of the light transmittance; The ratio of the local fluctuation degree of the haze to the overall fluctuation degree of the haze was taken as the relative fluctuation degree of the haze.
  5. 5. The method for detecting light transmittance of an optical film according to claim 1, wherein the other calculation process of the abnormality evaluation value is: Analyzing the deviation ratio of the change gradient of the light transmittance at any measuring point relative to the light transmittance change on the standard sample aiming at the local area of any measuring point, and calculating the relative change quantity of the light transmittance; Analyzing the deviation ratio of the variation gradient of the haze at any measuring point relative to the haze variation on the standard sample, and calculating the relative variation of the haze; The abnormal evaluation value is a result of forward fusion of the relative amount of change in light transmittance and the relative amount of change in haze.
  6. 6. The method for detecting light transmittance of an optical film according to claim 5, wherein the calculation process of the relative change amount of light transmittance and haze is: based on the light transmittance and the haze of all the measuring points in the local area where any measuring point is located, respectively acquiring the gradient of the light transmittance and the gradient of the haze at any measuring point, and respectively calculating the gradient amplitude of the light transmittance and the gradient amplitude of the haze; Calculating the average value of the gradient amplitude values of the light transmittance and the average value of the gradient amplitude values of the haze at all measuring points on the standard sample, respectively used as the reference gradient amplitude of the light transmittance and the reference gradient amplitude of the haze; taking the ratio of the gradient amplitude of the light transmittance to the reference gradient amplitude of the light transmittance as the relative variation of the light transmittance; the ratio of the gradient amplitude of the haze to the reference gradient amplitude of the haze is taken as the relative variation of the haze.
  7. 7. The method for detecting light transmittance of an optical film according to claim 1, wherein the abnormal region is obtained by marking a local region where a measurement point having an abnormal evaluation value larger than a predetermined threshold value is located as an abnormal region.
  8. 8. The method for detecting the light transmittance of an optical film according to claim 1, wherein the light transmittance distribution map and the haze distribution map are obtained by estimating and interpolating by a spatial interpolation method based on the light transmittance and the haze of all measurement points of the optical film to be detected for two scans to generate the light transmittance distribution map and the haze distribution map of the whole optical film to be detected.
  9. 9. A system for optical film transparency detection comprising a memory, a processor and a computer program stored in the memory and running on the processor, wherein the processor, when executing the computer program, performs the steps of a method for optical film transparency detection according to any one of claims 1-8.

Description

Light transmittance detection method and system for optical film Technical Field The application relates to the technical field of light transmittance detection, in particular to a light transmittance detection method and system of an optical film. Background In the high-end manufacturing fields of vehicle-mounted display screens, precise optical elements and the like, the light transmittance of an optical film is one of key indexes for measuring the quality of products, the light transmittance not only affects the optical performance of the film, but also directly relates to the performance of the film in practical application, and if the light transmittance of the film is insufficient or the haze is too high, uneven display brightness, dark spots or glare can be generated, and the visual effect and the yield of terminal products are seriously affected. The traditional light transmittance detection mainly adopts an integrating sphere method, but the measuring light spot of the integrating sphere is usually small, only light transmittance data at a single point can be obtained in each measurement, for a large-area optical film, if scanning is carried out by adopting low resolution, the measuring points are sparse and limited, the light transmittance of the whole film cannot be represented, defects such as irregular scratches, dirt or partial coating and the like are extremely easy to miss and detect, the detection precision is insufficient, and if the whole film is scanned in a whole area with high resolution point by point mode, the measuring points are more, the detection time is long, and the detection efficiency is low. Disclosure of Invention In order to solve the above technical problems, a method and a system for detecting light transmittance of an optical film are provided to solve the existing problems. The application provides a light transmittance detection method and a light transmittance detection system for an optical film, which solve the technical problems, and comprise the following steps: in a first aspect, an embodiment of the present application provides a method for detecting light transmittance of an optical film, including the steps of: Selecting a standard sample of the optical film, and scanning the standard sample with a preset first resolution to obtain the light transmittance and the haze of the standard sample at each measuring point; Executing a multi-stage scanning strategy for an optical film to be tested, wherein the strategy comprises the following steps: firstly, carrying out primary global scanning on an optical film to be detected at a preset second resolution, and obtaining the light transmittance and the haze of the optical film to be detected at each measuring point in the primary scanning; Aiming at each measuring point after the first scanning, evaluating the fluctuation abnormality of the local area by the change fluctuation condition of the light transmittance and the haze in the local area where the measuring point is positioned, and determining the abnormality evaluation value of the local area where each measuring point is positioned so as to screen out the abnormality area; And performing secondary scanning on the abnormal region with a preset first resolution, and generating a light transmittance distribution map and a haze distribution map which cover the whole optical film to be detected based on the light transmittance and the haze of all measuring points corresponding to the secondary scanning so as to detect the light transmittance of the optical film. Preferably, the predetermined first resolution is greater than the predetermined second resolution. Preferably, determining the abnormal evaluation value of the local area where each measuring point is located includes calculating the abnormal evaluation value of the local area where each measuring point is located by the deviation degree of variation fluctuation of light transmittance and haze of all measuring points in the local area where each measuring point is located relative to the standard sample after the first scanning. Preferably, a calculation process of the anomaly evaluation value is as follows: Analyzing the deviation ratio of the light transmittance discrete degree of all the measuring points in the local area of each measuring point after the first scanning relative to the light transmittance discrete degree of all the measuring points on the standard sample, and calculating the relative fluctuation degree of the light transmittance; analyzing the deviation ratio of the degree of dispersion of the haze of all the measuring points in the local area where each measuring point is located after the first scanning relative to the degree of dispersion of the haze of all the measuring points on the standard sample, and calculating the relative fluctuation degree of the haze; and selecting the maximum value of the relative fluctuation degree of the light transmittance and the relative fluctuation