CN117183412B - Polarizer correcting method based on color measurement - Google Patents
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Abstract
The invention relates to the technical field of polaroid trimming, in particular to a polaroid correction method based on color measurement, which comprises the following steps: attaching the fixed grating to the polarizer to be detected to form a fixed detection sheet; placing the fixed detection sheet on the movable grating, and connecting the fixed detection sheet with the movable grating; irradiating a beam of parallel light with the same color and projecting the parallel light on a projection plate; selecting and detecting parallel light by using an image detection device; the movable grating and the fixed grating form a detection grating pitch; determining a correction strategy of the polaroid according to the received color of the projection plate; according to the invention, parallel light with a certain frequency is projected on the polaroid, the defects of the polaroid are judged according to the images and the colors displayed on the projection plate, and meanwhile, correction is carried out in a repairing or polishing mode according to the judging result, so that the accuracy of polaroid detection is effectively improved, and meanwhile, the accuracy of polaroid test is effectively improved.
Description
Technical Field
The invention relates to the technical field of polaroid trimming, in particular to a polaroid correction method based on color measurement.
Background
The polaroid is used as a common display material, and can be frequently seen in life, and the material for manufacturing the polaroid is relatively easy to damage and difficult to repair in the use process; damage can lead to differences in display color, which can lead to manufacturing difficulties.
Chinese patent grant bulletin number: CN110001039B discloses a method for correcting warpage of polarizing plate sheet, which comprises placing polarizing plate sheet in a cylinder, and correcting for a certain time under suitable environmental temperature and temperature conditions, thereby correcting the product of warpage NG again into a qualified product. The invention overcomes the restriction of the field and equipment requirement conditions in the prior art; the method has obvious advantages in the aspect of cost, and the warping finished product with NG is corrected in a targeted manner, so that the waste of cost is reduced; the correction tool has simple structure and low precision on environmental requirements, and can realize batch correction.
It can be seen that the above technical solution has the following problems: the color of the polaroid cannot be accurately measured, and the problem that the color cannot be repaired is solved.
Disclosure of Invention
Therefore, the invention provides a polaroid correction method based on color measurement, which is used for solving the problem that the color of a polaroid cannot be accurately measured in the prior art, so that the display effect of the polaroid is reduced.
In order to achieve the above object, the present invention provides a method for correcting a polarizer based on color measurement, which is used for a light-transmitting polarizer, and includes:
step S1, attaching a fixed grating to a polarizer to be detected to form a fixed detection sheet;
s2, placing the fixed detection sheet on the movable grating, and connecting the fixed detection sheet with the movable grating;
s3, irradiating a beam of parallel light with the same color from one side of the movable grating far away from the fixed detection sheet to the movable grating by using a test light source, and projecting the parallel light onto a projection plate;
s4, identifying the color received by the projection plate by using image detection equipment, and adjusting the color of the parallel light according to the identification result so as to select and detect the parallel light;
step S5, when the detection parallel light is obtained, adjusting the grid distance of the movable grating, so that the movable grating and the fixed grating form a detection grid distance;
s6, projecting the detection parallel light on the fixed detection sheet, and determining a correction strategy of the polaroid according to the received color of the projection plate;
the movable grating can adjust the grating distance and adjust the relative position between the movable grating and the fixed detection piece; the relative positions of the projection plate and the movable grating are fixed; the correction strategy is a correction mode and a correction position of the polaroid.
Further, in the step S3, the color of the test light source is related to the pitch of the fixed grating, and for a single fixed grating, the color of the corresponding test light source is within a preset test range;
the preset test range includes a frequency lower threshold and a frequency upper threshold.
Further, in the step S3, the test light source emits test light, and forms emergent light through the moving grating, the polarizer to be detected and the fixed grating;
the emergent ray irradiates the projection plate at an emergent angle;
wherein the image irradiated on the projection plate is stripe-shaped.
Further, in the step S4, when an image on the projection plate is detected,
if the number of the stripes of the image is smaller than the number of the grating lattices of the fixed grating, the image detection equipment judges that the maximum wavelength of the test light source is larger than the maximum detection wavelength threshold value, and the frequency lower threshold value is adjusted to be higher by a preset adjustment value;
if any stripes of the image are intersected with each other, the image detection device judges that the minimum wavelength of the test light source is smaller than a minimum wavelength threshold value, and the frequency upper threshold value is reduced by a preset adjustment value;
wherein the maximum detection wavelength threshold is positively correlated with the pitch of the fixed grating; the minimum detection wavelength threshold is positively correlated with the distance between the projection plate and the fixed grating; the preset adjustment value is positively correlated with the difference between the frequency upper threshold and the frequency lower threshold.
Further, in the step S1, the surface area of the fixed grating is larger than the polarizer, and the angles of the grids of the fixed grating and the polarizer are set correspondingly, so that the polarizer can work.
Further, in the step S2, the moving grating includes a stage for fixing the fixed detection piece and a grating disposed in the stage and capable of moving along a predetermined path;
wherein, each grating of the movable grating and the fixed grating is parallel;
the preset path is perpendicular to each grating of the fixed grating.
Further, in the step S5, the moving grating is adjusted, and steps S3 to S4 are repeated to obtain the detection pitch;
wherein the detection pitch is related to the thickness of the polarizer.
Further, in the step S4, the light of each wavelength emitted by the light source corresponding to the detected parallel light can be irradiated on the projection plate through the polarizer.
Further, in the step S6, the image detection apparatus determines a defect of the polarizer according to the image on the projection plate, wherein,
if an area with the brightness higher than the preset brightness appears on the projection plate, the image detection equipment judges that the polaroid of the area has a concave defect and judges that the concave part of the area is repaired;
if an area with brightness lower than the preset brightness appears on the projection plate, the image detection equipment judges that the polaroid of the area has a bulge defect and judges that the bulge of the area is polished;
wherein the preset brightness is related to the brightness of the light source for detecting the parallel light.
Further, the image detection device also judges the defect of the polarizer according to the saturation of the image on the projection plate, wherein,
if the position with the saturation higher than the preset saturation appears on the projection plate, the image detection equipment judges that the polaroid is damaged and discards the polaroid;
wherein the preset saturation is related to the light source saturation of the detection parallel light.
Compared with the prior art, the method has the advantages that the method utilizes the mode of setting the fixed grating and the movable grating to project the parallel light with a certain frequency on the polaroid, judges the defects of the polaroid according to the images and the colors displayed on the projection plate, and corrects the defects by utilizing the repairing or polishing mode according to the judging result, so that the accuracy of the polaroid detection is effectively improved, and meanwhile, the accuracy of the polaroid test is effectively improved.
Further, the testing conditions are set in a mode of adjusting the color range of the testing light source, the grid distance between the testing light source and the grating is adjusted through the appearance of an image formed by the polaroid and the grating, and the accuracy of testing the polaroid is further improved while the reliability of the testing environment is effectively improved.
Furthermore, the accuracy of the testing environment on the polaroid is adjusted by aligning the positions of the grating and the polaroid, so that the controllability of the polaroid testing is effectively improved, and meanwhile, the accuracy of the polaroid testing is further improved.
Further, the flatness defect of the polaroid is judged by determining the color brightness, and a corresponding repair strategy is formulated according to the flatness defect, so that the defect of the polaroid can be rapidly positioned and repaired while the defect of the polaroid is effectively amplified, and the accuracy of testing the polaroid is further improved.
Further, the polarizer which cannot be repaired is discarded, so that the accuracy of polarizer test is further improved while the waste of repair resources is avoided.
Drawings
FIG. 1 is a flowchart of a method for correcting a polarizer based on color measurement according to the present invention;
FIG. 2 is a schematic diagram showing the positions of a projection plate and a polarizer according to an embodiment of the present invention;
wherein: 1, a polaroid to be measured; 2, projecting a plate; 3, defect points; 4, high brightness point.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1, which is a flowchart of a method for correcting a polarizer based on color measurement according to the present invention, the method for correcting a polarizer based on color measurement is used for a light-transmitting polarizer, and includes:
step S1, attaching a fixed grating to a polarizer to be detected to form a fixed detection sheet;
s2, placing the fixed detection sheet on the movable grating, and connecting the fixed detection sheet with the movable grating;
s3, irradiating a beam of parallel light with the same color from one side of the movable grating far away from the fixed detection sheet to the movable grating by using a test light source, and projecting the parallel light on a projection plate;
s4, identifying the color received by the projection plate by using image detection equipment, and adjusting the color of the parallel light according to the identification result so as to select and detect the parallel light;
step S5, when the detection parallel light is obtained, adjusting the grid distance of the movable grating, so that the movable grating and the fixed grating form a detection grid distance;
step S6, projecting the detection parallel light on a fixed detection sheet, and determining a correction strategy of the polaroid according to the received color of the projection plate;
the movable grating can adjust the grating distance and adjust the relative position with the fixed detection sheet; the relative positions of the projection plate and the movable grating are fixed; the correction strategy is a correction mode and a correction position of the polaroid.
Compared with the prior art, the method has the advantages that the method utilizes the mode of setting the fixed grating and the movable grating to project the parallel light with a certain frequency on the polaroid, judges the defects of the polaroid according to the images and the colors displayed on the projection plate, and corrects the defects by utilizing the repairing or polishing mode according to the judging result, so that the accuracy of the polaroid detection is effectively improved, and meanwhile, the accuracy of the polaroid test is effectively improved.
Specifically, in step S3, the color of the test light source is related to the pitch of the fixed grating, and for a single fixed grating, the color of the corresponding test light source is within a preset test range;
the preset test range includes a frequency lower threshold and a frequency upper threshold.
It will be appreciated that for a single light source, the color of the emitted light is frequency dependent, and for a single color, it comprises a range of frequencies;
in practice, the following is used:
the frequency range of the ultraviolet light is 680-790MHz, namely the lower frequency threshold value is 680MHz, and the upper frequency threshold value is 790MHz;
the frequency range of blue light is 620-680MHz, namely the lower frequency threshold value is 680MHz, and the upper frequency threshold value is 790MHz;
the frequency range of the cyan light is 600-620MHz, namely the lower frequency threshold value is 600MHz, and the upper frequency threshold value is 620MHz;
the frequency range of the green light is 530-600MHz, namely the lower frequency threshold value is 530MHz, and the upper frequency threshold value is 600MHz;
the frequency range of yellow light is 510-530MHz, namely the lower frequency threshold is 510MHz and the upper frequency threshold is 530MHz;
the frequency range of the orange light is 480-510MHz, namely the lower frequency threshold value is 480MHz, and the upper frequency threshold value is 510MHz;
the frequency range of the red light is 405-480MHz, namely the lower frequency threshold value is 405MHz and the upper frequency threshold value is 480MHz;
it is understood that the frequency of the light may be adjusted in a targeted manner, which is not described herein.
Specifically, in step S3, the test light source emits test light, and an outgoing light is formed by moving the grating, the polarizer to be detected, and the fixed grating;
the emergent ray irradiates on the projection plate at an emergent angle;
wherein the image irradiated on the projection plate is stripe-shaped.
It will be appreciated that the incident angle and the exit angle of the parallel light are greatly shifted after the parallel light passes through the grating and the polarizer, and the parallel light is diffracted when passing through the grating.
In practice, diffraction can be avoided by reducing the spacing between the projection plate and the grating.
Specifically, in step S4, when detecting an image on the projection plate,
if the number of the fringes of the image is smaller than the number of the light grids of the fixed grating, the image detection equipment judges that the maximum wavelength of the test light source is larger than the maximum detection wavelength threshold value, and the frequency lower threshold value is adjusted to be higher by a preset adjustment value;
if any stripes of the image are intersected with each other, the image detection device judges that the minimum wavelength of the test light source is smaller than a minimum wavelength threshold value, and the frequency upper threshold value is reduced by a preset adjustment value;
wherein, the maximum detection wavelength threshold value and the grid distance of the fixed grating form positive correlation; the minimum detection wavelength threshold is positively correlated with the distance between the projection plate and the fixed grating; the preset adjustment value is positively correlated with the difference between the upper frequency threshold and the lower frequency threshold.
The testing conditions are set by means of adjusting the color range of the testing light source, the grid distance between the testing light source and the grating is adjusted by means of the image appearance formed by the polaroid and the grating, and the testing accuracy of the polaroid is further improved while the reliability of the testing environment is effectively improved.
It will be appreciated that the wavelength of light is inversely proportional to the frequency, and whether light diffracts at the grating is related to its wavelength, and will not be described in detail herein.
In implementation, by adjusting the upper frequency threshold and the lower frequency threshold, diffraction phenomenon on the projection plate can be effectively avoided, taking green light as an example:
if diffraction is generated on the projection plate and the number of stripes is less than the number of grids of the grating, adjusting the lower threshold of the frequency to 602MHz;
if diffraction is generated on the projection plate and an arc pattern is generated, adjusting the upper frequency threshold value to 618MHz;
in the above embodiment, the preset adjustment value is 2MHz; it can be appreciated that in implementation, the preset adjustment value may be specifically adjusted according to a difference between the frequency upper threshold and the frequency lower threshold, which is not described herein.
Specifically, in step S1, the surface area of the fixed grating is larger than that of the polarizer, and the angles of each grid of the fixed grating and the polarizer are set correspondingly, so that the polarizer can work.
It can be understood that, for the polarizer, the angle is 45 degrees or 135 degrees, and the grating corresponds to the angle, so that the polarizer can work normally in the test;
in implementation, the angle corresponding to the grating and the polarizer is determined by the material of the grating, and the testing can be performed, and the detailed description is omitted.
Specifically, in step S2, the moving grating includes a stage for fixing the detection piece and a grating provided in the stage and movable along a predetermined path;
wherein, each grating of the movable grating and the fixed grating is parallel;
the preset path is perpendicular to each grating of the fixed grating.
The accuracy of the testing environment on the polaroid is adjusted by aligning the positions of the grating and the polaroid, so that the accuracy of the polaroid test is further improved while the controllability of the polaroid test is effectively improved.
It can be understood that if the grids of the movable grating and the fixed grating are not parallel, the testing environment is damaged, so that the image on the projection plate forms a net or a spherical pattern, and the flatness of the polarizer is difficult to judge.
Specifically, in step S5, the moving grating is adjusted, and steps S3 to S4 are repeated to obtain a detection pitch;
wherein the detection pitch is related to the thickness of the polarizer.
Specifically, in step S4, the light of each wavelength emitted from the light source corresponding to the detected parallel light can be irradiated onto the projection plate through the polarizer.
It will be appreciated that for a single colour of light, which contains a non-unique frequency of light, in practice, if light at its critical value cannot impinge on the projection plate, this test cannot determine the angular defect of the polarizer.
Specifically, in step S6, the image detection apparatus determines a defect of the polarizer based on the image on the projection plate, wherein,
if an area with the brightness higher than the preset brightness appears on the projection plate, the image detection equipment judges that the polaroid of the area has a concave defect and judges that the concave part of the area is repaired;
if an area with the brightness lower than the preset brightness appears on the projection plate, the image detection equipment judges that the polaroid of the area has a bulge defect and judges that the bulge of the area is polished;
wherein the preset brightness is related to the brightness of the light source for detecting the parallel light.
Please refer to fig. 2, which is a schematic diagram illustrating the positions of the projection plate and the polarizer according to an embodiment of the present invention, wherein a set of parallel raster images are projected on the projection plate 2 by the polarizer 1, and if any high brightness point 4 appears on the projection plate 2, the corresponding position of the point on the polarizer 1 is a defect point 3;
it can be understood that, in the diffraction of the parallel light, if the brightness of a single point is greater than that of the rest positions, the projection position corresponding to the point is the same as the position where the point is located, which is not described herein.
The flatness defect of the polaroid is judged by determining the color brightness, and a corresponding repair strategy is formulated according to the flatness defect, so that the defect of the polaroid can be rapidly positioned and repaired while the defect of the polaroid is effectively amplified, and the accuracy of the polaroid test is further improved.
It is understood that brightness is the brightness of a color, which is proportional to the frequency of light;
in practice, the repair is performed by using glue and a caulking agent; the polishing mode comprises polishing by using an edging device and polishing materials.
Specifically, the image detection apparatus also judges a defect of the polarizer according to the saturation of the image on the projection plate, wherein,
if the position with the saturation higher than the preset saturation appears on the projection plate, the image detection equipment judges that the polaroid is damaged and discards the polaroid;
the preset saturation is related to the saturation of the light source for detecting the parallel light.
And the polarizer which cannot be repaired is discarded, so that the accuracy of testing the polarizer is further improved while the waste of repair resources is avoided.
It can be understood that if a point with saturation exceeding the preset saturation appears, it represents that a defect appears in the polarizer in the angle, i.e. the stretching direction, and the defect cannot be repaired by the conventional means, so that the equipment using the polarizer can be maintained more effectively by timely discarding.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the invention; various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A color measurement-based polarizer correction method, which is used for a light-transmitting polarizer, comprising:
step S1, attaching a fixed grating to a polarizer to be detected to form a fixed detection sheet;
s2, placing the fixed detection sheet on the movable grating, and connecting the fixed detection sheet with the movable grating;
s3, irradiating a beam of parallel light with the same color from one side of the movable grating far away from the fixed detection sheet to the movable grating by using a test light source, and projecting the parallel light onto a projection plate;
s4, identifying the color received by the projection plate by using image detection equipment, and adjusting the color of the parallel light according to the identification result so as to select and detect the parallel light;
step S5, when the detection parallel light is obtained, adjusting the grid distance of the movable grating, so that the movable grating and the fixed grating form a detection grid distance;
s6, projecting the detection parallel light on the fixed detection sheet, and determining a correction strategy of the polaroid according to the received color of the projection plate;
the movable grating can adjust the grating distance and adjust the relative position between the movable grating and the fixed detection piece; the relative positions of the projection plate and the movable grating are fixed; the correction strategy is a correction mode and a correction position of the polaroid;
in the step S3, the color of the test light source is related to the pitch of the fixed grating, and for a single fixed grating, the color of the corresponding test light source is within a preset test range;
the preset test range comprises a frequency lower threshold value and a frequency upper threshold value;
in the step S3, the test light source emits test light, and the test light passes through the movable grating, the polarizer to be detected and the fixed grating to form emergent light;
the emergent ray irradiates the projection plate at an emergent angle;
wherein the image irradiated on the projection plate is stripe-shaped;
in the step S4, when detecting an image on the projection plate,
if the number of the stripes of the image is smaller than the number of the grating lattices of the fixed grating, the image detection equipment judges that the maximum wavelength of the test light source is larger than the maximum detection wavelength threshold value, and the frequency lower threshold value is adjusted to be higher by a preset adjustment value;
if any stripes of the image are intersected with each other, the image detection equipment judges that the minimum wavelength of the test light source is smaller than a minimum detection wavelength threshold value, and the frequency upper threshold value is reduced by a preset adjustment value;
wherein the maximum detection wavelength threshold is positively correlated with the pitch of the fixed grating; the minimum detection wavelength threshold is positively correlated with the distance between the projection plate and the fixed grating; the preset adjustment value is positively correlated with the difference between the frequency upper threshold and the frequency lower threshold.
2. The method for correcting a polarizer based on color measurement according to claim 1, wherein in the step S1, the surface area of the fixed grating is larger than that of the polarizer, and the angles of each grid of the fixed grating and the polarizer are set correspondingly to enable the polarizer to work.
3. The color measurement-based polarizer correcting method according to claim 2, wherein in the step S2, the moving grating includes a stage to fix the fixed detection sheet and a grating provided in the stage to be movable along a predetermined path;
wherein, each grating of the movable grating and the fixed grating is parallel;
the preset path is perpendicular to each grating of the fixed grating.
4. The color measurement-based polarizer correction method according to claim 3, wherein in the step S5, the moving grating is adjusted, and steps S3 to S4 are repeated to obtain the detection pitch;
wherein the detection pitch is related to the thickness of the polarizer.
5. The method for correcting a polarizer based on color measurement according to any one of claims 2 to 4, wherein in the step S4, each wavelength of light emitted from the light source corresponding to the detected parallel light can be irradiated onto the projection plate through the polarizer.
6. The method for correcting a polarizer based on color measurement according to claim 5, wherein in the step S6, the image detecting apparatus judges a defect of the polarizer based on the image on the projection plate, wherein,
if an area with the brightness higher than the preset brightness appears on the projection plate, the image detection equipment judges that the polaroid of the area has a concave defect and judges that the concave part of the area is repaired;
if an area with brightness lower than the preset brightness appears on the projection plate, the image detection equipment judges that the polaroid of the area has a bulge defect and judges that the bulge of the area is polished;
wherein the preset brightness is related to the brightness of the light source for detecting the parallel light.
7. The method for correcting a polarizer based on color measurement according to claim 6, wherein the image detecting apparatus further judges a defect of the polarizer according to a saturation of an image on the projection plate, wherein,
if the position with the saturation higher than the preset saturation appears on the projection plate, the image detection equipment judges that the polaroid is damaged and discards the polaroid;
wherein the preset saturation is related to the light source saturation of the detection parallel light.
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| CN111398288A (en) * | 2020-03-05 | 2020-07-10 | 包头联方高新技术有限责任公司 | System, method and device for full-width circumferential detection of surface of continuous casting billet in online hot state |
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