CN212513351U - Interferometer for measuring liquid crystal transmission wavefront - Google Patents
Interferometer for measuring liquid crystal transmission wavefront Download PDFInfo
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- CN212513351U CN212513351U CN202021794471.1U CN202021794471U CN212513351U CN 212513351 U CN212513351 U CN 212513351U CN 202021794471 U CN202021794471 U CN 202021794471U CN 212513351 U CN212513351 U CN 212513351U
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Abstract
The utility model discloses an interferometer for measuring the transmission wavefront of liquid crystal, which comprises a base and an industrial personal computer arranged on the base; the base is provided with a light path structure; the base is provided with a camera, and the camera is connected with an industrial personal computer; the light path structure comprises light source equipment and a reflection reference mirror corresponding to the light source equipment; a beam splitter prism, a first collimating mirror and a transmission reference mirror are sequentially arranged between the light source equipment and the reflection reference mirror; the other side position on the beam splitting prism corresponds to the camera, and a second collimating mirror is arranged between the lens of the camera and the beam splitting prism. The utility model relates to an interferometer based on laser adopts the linear polarization light output, and the polarization direction is unanimous with liquid crystal blind hole or liquid crystal display panel's birefringence O light direction, realizes liquid crystal blind hole or liquid crystal display panel's the wavefront of seeing through measurement's accuracy.
Description
Technical Field
The utility model relates to an interferometer field particularly, relates to a measure interferometer that liquid crystal sees through wavefront.
Background
The material of the mobile phone camera hole is optical glass, and the measurement of the wavefront can be met by adopting a traditional laser interferometer. With the development of the full-screen technology, the front camera hole of the mobile phone starts to adopt a liquid crystal blind hole scheme, liquid crystal has birefringence, and the traditional laser interferometer can not accurately measure the transmitted wavefront of the liquid crystal hole any more.
The traditional laser interferometer outputs circularly polarized light, light beams are decomposed into o light and e light when passing through liquid crystal to be measured, and two sets of interference fringes can be formed after the two light beams return to a collecting camera of the interferometer. The two sets of interference fringes are superposed together and have a certain dislocation amount, and finally a set of fringe images with shadow interference are formed. The analysis result obtained from such a fringe pattern is greatly deviated from the actual value of the transmitted wavefront of the liquid crystal. Fig. 1 is a test light path diagram of a laser interferometer with a conventional structure, wherein light emitted by a laser 1 enters a polarization beam splitter prism 3 after passing through a condenser lens 2, and then irradiates a liquid crystal plate 7 to be tested after sequentially passing through an 1/4 wave plate 4, a collimator lens 5 and a perspective reference lens 6. The light rays pass through the liquid crystal plate 7 to be detected and then irradiate the emission reference mirror 8, return to the polarization beam splitter prism 3 according to the original path, and then enter the camera 8 from the collimating mirror 10 at another angle, so that imaging detection is realized.
The disadvantages of the above method are: the laser outputs circularly polarized light, after the light beam passes through the liquid crystal panel, the finally obtained image is the superposition of two sets of interference fringes of o light and e light, and the result obtained by analysis is incorrect at the moment.
In addition, in the existing interferometer structure, there is also a type of linearly polarized light output, and fig. 2 is a test light path diagram of an interferometer for linearly polarized light output, a linear polarization laser 11 is directly adopted to emit light, the light enters a non-polarization beam splitter prism 13 after passing through a condenser 12, and then irradiates a liquid crystal panel 16 to be tested after sequentially passing through a collimator 14 and a see-through reference mirror 15. The light passes through the liquid crystal panel 16 to be detected, then irradiates the emission reference mirror 17, returns to the polarization beam splitter prism 13 according to the original path, and enters the camera 18 from the collimating mirror 19 at another angle, so as to realize imaging detection.
A linear polarization laser is directly adopted, and the linear polarization laser outputs linearly polarized light. But the polarization direction is random, is not consistent with the O light direction of the liquid crystal to be measured, and the angle is random. When the polarization direction is exactly consistent with the light direction of the liquid crystal e, an error interference fringe is obtained; when the polarization direction is not coincident with the directions of o light and e light, corresponding light beam components can be obtained in the two directions, and the final imaging effect is the same as that of an interferometer outputting circularly polarized light.
The disadvantages of the above method are: although linearly polarized light is output, the polarization direction is random. When the polarization direction coincides with the liquid crystal e light direction, the resulting interference fringes are wrong; when the polarization direction is not coincident with the o light and the e light, the obtained image is still the superposition of two sets of interference fringes, and the analysis result is incorrect at the moment.
In view of this, it is an urgent need to solve the problem in the art to develop an interferometer for measuring the transmitted wavefront of liquid crystal by using a circular polarization laser and an adjustable rotating polarizer, so that the polarization direction of the emitted laser light is consistent with the o-ray direction of the liquid crystal panel to be tested, and the accurate test can be performed to ensure the accuracy of the test result.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to prior art's shortcoming, provide a measure liquid crystal and see through interferometer of wavefront, solved the defect of above-mentioned technique.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an interferometer for measuring the transmitted wave front of liquid crystal corresponds to a liquid crystal panel to be measured and comprises a base and an industrial personal computer arranged on the base; the method is characterized in that: the base is provided with a light path structure; the base is provided with a camera, and the camera is connected with an industrial personal computer; the light path structure comprises light source equipment and a reflection reference mirror corresponding to the light source equipment; a beam splitter prism, a first collimating mirror and a transmission reference mirror are sequentially arranged between the light source equipment and the reflection reference mirror; the other side position on the beam splitting prism corresponds to the camera, and a second collimating mirror is arranged between the lens of the camera and the beam splitting prism.
The light source equipment comprises a laser for circularly polarized light output, a rotating polaroid and a condenser lens, wherein the rotating polaroid and the condenser lens are arranged between the laser and a beam splitting prism; laser emitted by the laser device irradiates the beam splitting prism after passing through the rotating polaroid and the condenser.
In an optimized scheme, the beam splitter prism uses a non-polarization beam splitter prism.
According to the optimized scheme, the laser is decomposed into o light and e light after being irradiated on a liquid crystal panel; the o-direction coincides with the polarization direction of the rotating polarizer.
Owing to adopted above-mentioned technique, compare with prior art, the beneficial effects of the utility model are that:
1. the utility model discloses a circular polarized light output, laser are behind adjustable rotatory polaroid, are the pointolite by the condensing lens focus to behind non-polarization beam splitter prism, collimating mirror, by transmission reference mirror and reflection reference mirror reflection respectively, form the interference fringe in the camera position. The liquid crystal board that awaits measuring is fixed by the frock and is detected the position, and to the liquid crystal sample that different wafers arranged, o light direction only has two clear directions: the o light direction is parallel or perpendicular to the arrow direction in fig. 3. And adjusting the direction of the rotating polaroid to be consistent with the direction of the o light, so that a correct test can be carried out.
2. The utility model relates to an interferometer based on laser adopts the linear polarization light output, and the polarization direction is unanimous with liquid crystal blind hole or liquid crystal display panel's birefringence O light direction, realizes liquid crystal blind hole or liquid crystal display panel's the wavefront of seeing through measurement's accuracy.
Drawings
FIG. 1 is a diagram of a laser interferometer test path in a conventional configuration;
FIG. 2 is a test light path diagram of a conventional linearly polarized light output interferometer;
fig. 3 is a test light path diagram according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
As shown in fig. 3, an interferometer for measuring a transmitted wavefront of liquid crystal, corresponding to a liquid crystal panel 26 to be measured, includes a base and an industrial personal computer mounted on the base. The industrial personal computer adopts the existing equipment, and the principle, the connection relation and the working process of the equipment are not repeated.
The base is provided with a light path structure. The base is provided with a camera 28, the camera 28 is connected with an industrial personal computer, and a conclusion is obtained by analyzing data through a program of the industrial personal computer. The optical path structure includes a light source device and a reflection reference mirror 27 corresponding to the light source device. A beam splitter prism 22, a first collimating mirror 24 and a transmission reference mirror 25 are sequentially arranged between the light source device and the reflection reference mirror. The other side position on the beam splitting prism 22 corresponds to the camera 28, and a second collimating mirror 29 is arranged between the lens of the camera 28 and the beam splitting prism.
The light source device includes a laser 20 that circularly polarizes light output, a rotating polarizing plate 21 disposed between the laser 20 and a beam splitter prism 22, and a condenser lens 23. Laser light emitted from the laser 20 passes through the rotating polarizer and the condenser and then irradiates the beam splitter prism.
The beam splitter prism uses a non-polarization beam splitter prism. The laser is decomposed into o light and e light after being irradiated on the liquid crystal panel; the o-direction coincides with the polarization direction of the rotating polarizer.
The utility model discloses a circular polarized light output, laser are behind adjustable rotatory polaroid, are the pointolite by the condensing lens focus to behind non-polarization beam splitter prism, collimating mirror, by transmission reference mirror and reflection reference mirror reflection respectively, form the interference fringe in the camera position. The liquid crystal board 26 to be measured is fixed by the tool to detect the azimuth, and for the liquid crystal samples arranged on different wafers, the o light direction has only two definite directions: the o light direction is parallel or perpendicular to the arrow direction in fig. 3. And adjusting the direction of the rotating polaroid to be consistent with the direction of the o light, so that a correct test can be carried out.
The utility model relates to an interferometer based on laser adopts the linear polarization light output, and the polarization direction is unanimous with liquid crystal blind hole or liquid crystal display panel's birefringence O light direction, realizes liquid crystal blind hole or liquid crystal display panel's the wavefront of seeing through measurement's accuracy.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (4)
1. An interferometer for measuring the transmitted wave front of liquid crystal corresponds to a liquid crystal panel to be measured and comprises a base and an industrial personal computer arranged on the base;
the method is characterized in that:
the base is provided with a light path structure;
the base is provided with a camera, and the camera is connected with an industrial personal computer;
the light path structure comprises light source equipment and a reflection reference mirror corresponding to the light source equipment; a beam splitter prism, a first collimating mirror and a transmission reference mirror are sequentially arranged between the light source equipment and the reflection reference mirror; the other side position on the beam splitting prism corresponds to the camera, and a second collimating mirror is arranged between the lens of the camera and the beam splitting prism.
2. An interferometer for measuring the transmitted wavefront of a liquid crystal according to claim 1, wherein: the light source equipment comprises a laser for circularly polarized light output, a rotating polaroid and a condenser lens, wherein the rotating polaroid and the condenser lens are arranged between the laser and the beam splitter prism; laser emitted by the laser device irradiates the beam splitting prism after passing through the rotating polaroid and the condenser.
3. An interferometer for measuring the transmitted wavefront of a liquid crystal according to claim 2, wherein: the beam splitter prism uses a non-polarization beam splitter prism.
4. An interferometer for measuring the transmitted wavefront of a liquid crystal according to claim 3, wherein: the laser is decomposed into o light and e light after being irradiated on the liquid crystal panel; the o-direction coincides with the polarization direction of the rotating polarizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021794471.1U CN212513351U (en) | 2020-08-25 | 2020-08-25 | Interferometer for measuring liquid crystal transmission wavefront |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021794471.1U CN212513351U (en) | 2020-08-25 | 2020-08-25 | Interferometer for measuring liquid crystal transmission wavefront |
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| Publication Number | Publication Date |
|---|---|
| CN212513351U true CN212513351U (en) | 2021-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021794471.1U Active CN212513351U (en) | 2020-08-25 | 2020-08-25 | Interferometer for measuring liquid crystal transmission wavefront |
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| CN (1) | CN212513351U (en) |
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2020
- 2020-08-25 CN CN202021794471.1U patent/CN212513351U/en active Active
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