CN113720809A - Transmittance test equipment - Google Patents

Transmittance test equipment Download PDF

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Publication number
CN113720809A
CN113720809A CN202111086651.3A CN202111086651A CN113720809A CN 113720809 A CN113720809 A CN 113720809A CN 202111086651 A CN202111086651 A CN 202111086651A CN 113720809 A CN113720809 A CN 113720809A
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China
Prior art keywords
light
groove
film layer
light source
transmittance
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CN202111086651.3A
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石博
石佺
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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Priority to CN202111086651.3A priority Critical patent/CN113720809A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/59—Transmissivity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
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  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
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  • Pathology (AREA)
  • Polarising Elements (AREA)

Abstract

The invention relates to transmittance testing equipment which comprises a light source and an object stage positioned on the light emitting side of the light source, wherein the object stage is provided with a bearing surface for bearing a sample, and a light conversion structure is arranged between the light source and the bearing surface and used for converting light emitted by the light source into circularly polarized light. Through the setting of light conversion structure, convert the light that the light source sent into circular polarized light, eliminate the influence of the polarization characteristic of light, improve the accuracy nature of transmissivity test.

Description

Transmittance test equipment
Technical Field
The invention relates to the technical field of transmittance testing, in particular to transmittance testing equipment.
Background
At present, the universal under-screen camera (FDC) transmittance testing equipment in the industry is VMS-1S, and a light source of the equipment has certain polarization. Because the POL (polarizer) is attached to the camera hole area of the FDC, when a product with the polarizer is tested, the placing direction of a sample and the attaching precision of the POL can influence the accuracy of transmittance test.
Disclosure of Invention
In order to solve the technical problem, the invention provides a transmittance test device, which solves the influence of the polarization characteristic of a light source on transmittance test.
In order to achieve the purpose, the embodiment of the invention adopts the technical scheme that: the utility model provides a transmissivity test equipment, includes the light source and is located the objective table of the light-emitting side of light source, the objective table is provided with the loading face that is used for bearing the sample, the light source with be provided with the light conversion structure between the loading face, be used for with the light conversion that the light source sent is circular polarized light.
Optionally, along the emitting direction of the light source, the light conversion structure includes a first transparent substrate, a polarizing film layer, a compound refraction film layer and a second transparent substrate, which are sequentially stacked, the polarizing film layer is configured to convert light emitted by the light source into linearly polarized light, and the compound refraction film layer is configured to convert the linearly polarized light into circularly polarized light.
Optionally, an included angle between the stretching direction of the compound-refractive film layer and the transmission axis of the polarizing film layer is ± 45 ° ± 15 °.
Optionally, the phase difference value of the complex refraction film layer is 5000nm-10000 nm.
Optionally, the material of the compound-refraction film layer is polyethylene terephthalate or super compound-refraction polyester film.
Optionally, the first transparent substrate and the polarizing film layer are connected through a pressure-sensitive adhesive, the polarizing film layer and the compound folding film layer are connected through a pressure-sensitive adhesive, and the compound folding film layer and the second transparent substrate are connected through a pressure-sensitive adhesive.
Optionally, a first groove is formed in a first region of the object stage, the first groove extends from the bearing surface to a direction close to the light source, a first light passing hole is formed in the bottom of the first groove, and the light conversion structure is accommodated in the first groove.
Optionally, the cross-sectional shape of the groove in the light emitting direction of the light source is an inverted trapezoid.
Optionally, including being used for the installation department of light source, be provided with the second light hole on the installation department, the light-emitting side of second light hole is provided with and is used for holding the portion that holds of light conversion structure:
the accommodating part is provided with a second groove, the light conversion structure is accommodated in the second groove, the accommodating part comprises a first surface facing the objective table, and the second groove extends from the first surface to a direction close to the second light through hole;
the accommodating part further comprises a third groove, the third groove extends from the bottom of the second groove to the direction close to the light source and penetrates through the accommodating part, and the cross sectional area of one end, far away from the second groove, of the third groove is larger than or equal to the area of the second light through hole.
Optionally, in the light emitting direction of the light source, the cross-sectional shape of the second groove is an inverted trapezoid.
Alternatively, the mounting part and the receiving part are integrated into a unitary structure.
The invention has the beneficial effects that: through the setting of light conversion structure, convert the light that the light source sent into circular polarized light, eliminate the influence of the polarization characteristic of light, improve the accuracy nature of transmissivity test.
Drawings
FIG. 1 is a diagram illustrating transmittance of polarizers rotated by different angles in the related art;
FIG. 2 is a schematic diagram illustrating the polarization of light emitted from a light source;
FIG. 3 shows a schematic diagram of a light conversion structure in an embodiment of the invention;
FIG. 4 is a schematic diagram showing the transmittance of light in different polarization states in a transmittance testing apparatus without a light conversion structure;
FIG. 5 is a schematic diagram showing the transmittance of different polarization states of the transmittance testing device after the light conversion structure is arranged;
FIG. 6 is a graph showing the transmittance of light without a light converting structure;
FIG. 7 is a schematic diagram showing light transmittance of a light conversion structure;
FIG. 8 is a schematic diagram showing the light transmittance of the complex refractive film layers with different phase difference values;
FIG. 9 is a schematic view showing refractive indexes in respective directions of a retardation film;
FIG. 10 is a schematic view of a transmittance measuring apparatus 1;
FIG. 11 is a schematic view of the stage configuration;
FIG. 12 is a schematic view of a transmittance measuring apparatus 2;
fig. 13 is a partial structural diagram of the transmittance testing apparatus.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
When monitoring an FDC (under-screen camera) transmittance test with a product model of GC-D8, the transmittance data change obviously when changing the placing direction of a Panel. Further tests using only an analyzer (polarizer) show that the difference in transmittance is significant when the polarizer is rotated at different angles, as shown in fig. 1. Curve 100 represents transmittance of the polarizer rotated by 0 degree, curve 200 represents transmittance of the polarizer rotated by 45 degrees, and curve 300 represents transmittance of the polarizer rotated by 90 degrees, and thus, it was confirmed that the light emitted from the light source had polarization characteristics.
The principle of polarization generation of light emitted by a light source is shown in fig. 2. The light emitted by the halogen lamp is unpolarized light, but for collimation, a lens (made of glass) is designed on the halogen lamp, and when the light passes through the lens, the polarization characteristic is generated, and the Fresnel formula is as follows:
Figure BDA0003266025240000041
wherein A isp1Is the vibration amplitude, A ', of incident light in the P direction'p1Amplitude of vibration of reflected light in the P direction, As1Is the vibration amplitude, A ', of incident light in the S direction's1Amplitude of vibration of reflected light in the S direction, Ap2Amplitude of vibration in P direction for refracted light, As2The amplitude of the vibration of the refracted light in the S direction.
Light waves are reflected and refracted when passing through interface surfaces of different media, and incident light is divided into reflected light and refracted light. The relationship between the traveling directions of the two beams can be determined by the laws of reflection and refraction, but the amplitudes and vibrational orientations of the two beams cannot be determined. Fresnel is based on the assumption that light is a transverse wave, divides incident light into linearly polarized light with a vibration plane parallel to an incident plane and linearly polarized light perpendicular to the incident plane, and derives a fresnel formula of the relationship between the refraction ratio and the reflection ratio of light.
Since the specific polarization state of the partially polarized light generated in this way cannot be determined (linear polarization, elliptical polarization, and circular polarization with different polarization directions may be included), when products with POL (polarizer), such as FDC and fingerprint hole, are tested, the transmittance is affected by the position of the sample and the accuracy of POL application, and thus real transmittance data cannot be obtained.
To solve the above problem, this embodiment provides a transmittance test equipment, including the light source with be located the objective table of the light-emitting side of light source, the objective table is provided with the bearing surface that is used for bearing the sample, the light source with be provided with the light conversion structure between the bearing surface, be used for with the light conversion that the light source sent is circular polarized light.
Fig. 4 shows the transmittance of light with different polarization states after passing through the panel with a polarizer without the light conversion structure, and fig. 5 shows the transmittance of light with different polarization states after passing through the panel with a polarizer with the light conversion structure, so that the limitation of linearly polarized light can be broken and the transmittance can be improved after the light emitted by the light source is converted into circularly polarized light.
Fig. 6 shows a light transmittance curve without a light conversion structure, fig. 7 shows a light transmittance curve with a light conversion structure, a curve 400 in fig. 6 shows a horizontal sample, light transmittance, and a curve 500 shows a vertical sample, light transmittance is obvious, in fig. 6, the samples are arranged in different directions, and the curves have obvious difference, and fig. 7 also shows the light transmittance curves of the horizontal sample and the vertical sample, but the two are hardly distinguishable. Therefore, after the light conversion structure is adopted, the limitation of the placing direction of the sample is avoided, and the transmittance test accuracy is improved.
The specific structural form of the light conversion structure may be various, for example, a quarter-wave plate, but the quarter-wave plate can only convert linearly polarized light with a single waveband of wavelength 550nm into circularly polarized light, in order to convert linearly polarized light with more wavebands into circularly polarized light and improve transmittance, in some embodiments of this embodiment, referring to fig. 3, along the emitting direction of the light source, the light conversion structure includes a first transparent substrate 1, a polarizing film layer 2, a complex refractive film layer 3, and a second transparent substrate 4 that are sequentially stacked, where the polarizing film layer 2 is configured to convert light emitted by the light source into linearly polarized light, and the complex refractive film layer 3 is configured to convert the linearly polarized light into circularly polarized light.
The material of the compound refraction film layer 3 is a material with different refractive indexes in all directions, and can be formed by oriented stretching of a high polymer material, the compound refraction film layer has a larger phase difference value, and when linearly polarized light passes through the compound refraction film layer 3 with the larger phase difference value, the linearly polarized light can be converted into circularly polarized light. Whether the external visible light can pass through the total wavelength band light is related to the phase difference (Re) between the complex refractive film layer 3 and the complex refractive film layer 3, as shown in fig. 8, fig. 8 is a graph showing the phase difference (Re) between the complex refractive film layers corresponding to different phase differences (Re)The transmittance of the light in the whole wavelength band (wavelength lambda) is given by the following formula: I/I0＝1/2·sin2(π·Re/λ)，I0The intensity of the light before passing through the complex refraction film layer 3 is shown as I, and the intensity of the light after passing through the complex refraction film layer 3 is shown as I; note that the curve 600 represents the transmittance when the phase difference Re is 800, and the curve 700 represents the transmittance when the phase difference Re is 5000, and it can be seen that the larger the phase difference (Re), the more light is transmitted in the visible light band (that is, the light intensity is also large), and therefore, the birefringence film layer having a large phase difference is preferable.
Illustratively, the retardation value of the complex refraction film layer 3 is 5000nm-10000nm, and in this case, more wave bands of light can be transmitted through the sample with the polarizer.
The birefringence film is one of phase difference films, and after the alignment process (stretching) of the transparent polymer film, the molecular arrangement direction of the transparent polymer film is concentrated toward the alignment direction, so that the refractive index of light in each direction in the film is changed, and such a film is called a phase difference film. As shown in fig. 9, generally define: the direction of the maximum refractive index in the plane of the film is the slow axis direction (the direction of the arrow denoted by 800 in the figure), and the refractive index in this direction is nx; the direction of the slow phase axis in the membrane surface is orthogonal to the direction of the incoming axis, and the refractive index in the direction is ny; the refractive index of the film in the vertical direction is nz. The phase difference Re of the membrane is (nx-ny) · d, and it can be seen that the phase difference Re of the complex refractive film layer is related to the thickness d of the complex refractive film layer, and the larger the thickness d, the larger the phase difference Re.
In a specific implementation, the larger the thickness of the birefringence layer 3, the larger the phase difference value, the more light is transmitted in the visible light band, i.e. the higher the intensity of the linearly polarized light converted into circularly polarized light. However, since the current display device tends to be light and thin, and the thickness of the birefringence film 3 is large, which is not conducive to the light and thin display device, in order to satisfy the requirement of passing light in the visible light band as much as possible and meeting the light and thin display device, in the display device provided in the embodiment of the present invention, the phase difference of the birefringence film 3 is a predetermined value, wherein the predetermined value is 5000nm to 10000 nm. When the phase difference value of the complex refraction film layer is 5000nm-10000nm, more light can penetrate in a visible light wave band, and the display device can be thinned.
In some embodiments, the material of the birefringent film layer is a Polyethylene terephthalate (PET) film or a super retro-reflective polyester (SRF) film. However, the phase difference of SRF is larger than that of PET, and SRF is preferably used to satisfy the reduction in thickness.
In one embodiment, the multiple refraction film layer is SRF with a phase difference of 8000nm and a thickness of 75 μm.
Illustratively, in order to increase the transmittance of circularly polarized light through a sample having a polarizer, the angle between the stretching direction of the birefringent film layer and the transmission axis of the polarizing film layer is ± 45 ° ± 15 °.
In a specific embodiment, the included angle between the stretching direction of the complex refraction film layer 3 and the transmission axis of the polarization film layer is ± 45 °, so that almost all circularly polarized light can pass through the sample with the polarizer, and the accuracy of the transmittance test is improved.
Illustratively, the first transparent substrate 1 and the polarizing film layer 2 are connected by a pressure-sensitive adhesive, the polarizing film layer 2 and the birefringence film layer 3 are connected by a pressure-sensitive adhesive, and the birefringence film layer 3 and the second transparent substrate 4 are connected by a pressure-sensitive adhesive, but the present invention is not limited thereto, and for example, an optical adhesive may also be used.
In this embodiment, the first transparent substrate 1 and the second transparent substrate 4 are both glass substrates to ensure transparency, but not limited thereto.
In this embodiment, the first transparent substrate 1 plays a role in supporting, the second transparent substrate 4 plays a role in protecting, and the first transparent substrate 1 and the second transparent substrate 4 ensure the flatness of the compound-refractive film layer 3.
Referring to fig. 10 to 13, in this embodiment, the transmittance testing apparatus includes an installation portion 2 for installing the light source, a light intensity adjusting portion 3 for adjusting light intensity, an object stage 1 disposed directly above the light source, an object stage adjusting portion for adjusting the height of the object stage 1, a light intensity collecting sensor 5, an eyepiece 6, a light intensity collecting probe 7, and the like, and the structure of the transmittance testing apparatus may refer to a conventional transmittance testing apparatus and is not repeated again.
In some embodiments of this embodiment, in order to solve the problem that the polarization characteristic of light emitted by the light source affects the accuracy of the transmittance test, a light conversion structure is disposed between the light source and the carrying surface of the stage, so that the light of the light source is converted into circularly polarized light, the effect of the polarization characteristic of the light is eliminated, and the accuracy of the transmittance test is improved.
Referring to fig. 10 and 11, in some embodiments of this embodiment, the light conversion structure is integrally disposed on the object stage 1, a first groove 11 is disposed in a first region of the object stage 1, the first groove 11 extends from the carrying surface to a direction close to the light source, a first light passing hole 12 is disposed at a bottom of the first groove 11, and the light conversion structure is accommodated in the first groove 11.
Illustratively, the cross-sectional shape of the first groove 11 in the light emitting direction of the light source is an inverted trapezoid.
The shape of the first groove 11 is not limited to the above, and the light conversion structure is conveniently placed by adopting the inverted trapezoid structure in the embodiment.
Referring to fig. 12, the first groove 11 is a stepped groove, the first groove 11 includes a first sub-groove 101 and a second sub-groove 102, the second sub-groove 102 is formed by extending the bottom of the first sub-groove 101 toward the direction close to the light source, the second sub-groove 102 reduces the contact area with the light conversion structure, protects the first transparent substrate 1, and prevents the light conversion structure from directly contacting the first light passing hole 11, thereby avoiding damage to the lens (disposed on the collimating lens exiting from the first light passing hole).
Referring to fig. 10 and 13, in some embodiments of the present embodiment, the light conversion structure 10 is integrally disposed on the light exit side of the light source, the transmittance testing apparatus includes an installation portion 2 for installing the light source, a second light passing hole 21 is disposed on the installation portion 2, and the light exit side of the second light passing hole 21 is provided with an accommodating portion 8 for accommodating the light conversion structure 10:
the accommodating portion 8 is provided with a second groove 81, the light conversion structure 10 is accommodated in the second groove 81, the accommodating portion 8 includes a first surface facing the object stage 1, and the second groove 81 extends from the first surface to a direction close to the second light passing hole 21;
the accommodating part 8 further comprises a third groove 82, the third groove 82 extends from the bottom of the second groove 81 to a direction close to the light source and penetrates through the accommodating part 8, and the cross-sectional area of one end, away from the second groove 81, of the third groove 82 is larger than or equal to the area of the second light through hole 21.
Illustratively, the cross-sectional shape of the second groove 81 is an inverted trapezoid in the light emitting direction of the light source.
Illustratively, the mounting portion 2 and the receiving portion 8 are integrated into a unitary structure.
Installation department 2 with the structure that the portion 8 is integrated as an organic whole needs to change the structure originally of installation department 2, in some embodiments, directly sets up on the basis of the structure originally of transmissivity test equipment the portion 8 that holds, promptly the portion 8 with installation department 2 is the components of a whole that can function independently setting, need not to change original structure, directly connects portion 8 fixed connection in on installation department 2, portion 8 with installation department 2 also can adopt the detachable mode to connect. The area of the opening end of the third groove 82 connected with the second groove 81 is smaller than the area of the bottom of the second groove 81, that is, the second groove 81 and the third groove 82 form a stepped groove, the light conversion structure 10 is accommodated in the second groove 81, the third groove 82 allows light emitted from the second light passing hole 21 to pass through, and plays a role in protecting a lens (a collimating lens for realizing collimated light) arranged at the second light passing hole 21, and plays a role in protecting the light conversion structure 10.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims (11)

1. The utility model provides a transmissivity test equipment, includes the light source and is located the objective table of the light-emitting side of light source, the objective table is provided with the loading face that is used for bearing the sample, its characterized in that, the light source with be provided with the light conversion structure between the loading face, be used for with the light conversion that the light source sent is circular polarized light.
2. The transmittance testing apparatus according to claim 1, wherein along the emitting direction of the light source, the light conversion structure includes a first transparent substrate, a polarizing film layer, a compound refraction film layer, and a second transparent substrate, which are sequentially stacked, the polarizing film layer is configured to convert the light emitted from the light source into linearly polarized light, and the compound refraction film layer is configured to convert the linearly polarized light into circularly polarized light.
3. The transmittance testing apparatus of claim 2, wherein the included angle between the stretching direction of the birefringent film layer and the transmission axis of the polarizing film layer is ± 45 ° ± 15 °.
4. The transmittance testing apparatus of claim 2, wherein the phase difference value of the complex refractive film layer is 5000nm to 10000 nm.
5. The transmittance testing apparatus according to claim 2, wherein the material of the complex refractive film layer is polyethylene terephthalate or super complex refractive polyester film.
6. The transmittance testing apparatus according to claim 2, wherein the first transparent substrate is connected to the polarizing film layer through a pressure-sensitive adhesive, the polarizing film layer is connected to the birefringence film layer through a pressure-sensitive adhesive, and the birefringence film layer is connected to the second transparent substrate through a pressure-sensitive adhesive.
7. The transmittance testing apparatus according to claim 2, wherein the first region of the stage has a first groove, the first groove extends from the carrying surface to a direction close to the light source, a first light hole is disposed at a bottom of the first groove, and the light conversion structure is accommodated in the first groove.
8. The transmittance testing apparatus according to claim 7, wherein the cross-sectional shape of the first groove in the light-emitting direction of the light source is an inverted trapezoid.
9. The transmittance testing apparatus according to claim 2, comprising a mounting portion for mounting the light source, wherein a second light through hole is disposed on the mounting portion, and a receiving portion for receiving the light conversion structure is disposed on a light emitting side of the second light through hole:
the accommodating part is provided with a second groove, the light conversion structure is accommodated in the second groove, the accommodating part comprises a first surface facing the objective table, and the second groove extends from the first surface to a direction close to the second light through hole;
the accommodating part further comprises a third groove, the third groove extends from the bottom of the second groove to the direction close to the light source and penetrates through the accommodating part, and the cross sectional area of one end, far away from the second groove, of the third groove is larger than or equal to the area of the second light through hole.
10. The transmittance testing apparatus according to claim 9, wherein the cross-sectional shape of the second groove is an inverted trapezoid in the light outgoing direction of the light source.
11. The transmittance testing apparatus according to claim 9, wherein the mounting portion and the receiving portion are integrated into a unitary structure.
CN202111086651.3A 2021-09-16 2021-09-16 Transmittance test equipment Pending CN113720809A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114544151A (en) * 2022-02-25 2022-05-27 歌尔股份有限公司 Lens transmittance detection device and detection method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114544151A (en) * 2022-02-25 2022-05-27 歌尔股份有限公司 Lens transmittance detection device and detection method thereof

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