Camera module and method for preparing camera module

Abstract

The invention provides a camera module and a method for preparing the camera module, and relates to the technical field of digital imaging. The camera module comprises: a lens, an actuator and an image sensor, wherein the image sensor comprises a color filter covered with an organic dye composition, wherein the organic dye composition is obtained by mixing a polymer material with a dye and then adding a solvent to make it liquid, and then the organic dye composition is coated on the color filter by a coating process to replace the function of an infrared cutoff filter in a traditional camera module, thereby achieving the purpose of improving the camera module, and further solving the technical problem of stray light generated by the infrared cutoff filter in the prior art, thereby achieving the technical effect of improving the stray light of the camera module and reducing the height of the camera module.

Description

Technical Field

[0001] The present invention relates to the technical field of digital imaging, and in particular to a camera module and a method for preparing the camera module. Background Art

[0002] The camera module mainly consists of three parts: lens, infrared cut-off filter and image sensor. Among them, the infrared cut-off filter is an optical filter that uses precision optical coating technology to alternately coat high and low refractive index optical films on the optical substrate to achieve high transmittance in the visible light region (400-630nm) and cut off near infrared (700-1100nm). It is mainly used in digital imaging fields such as camera phones, built-in cameras in computers, and car cameras to eliminate the impact of infrared light on CCD or CMOS imaging.

[0003] However, in the field of optics, all media have different refractive indices. For example, the refractive index of a vacuum is 1, the refractive index of oil is 0.8, the refractive index of glass is 1.52, etc. When light contacts a substance, there will be a variety of interactions, resulting in reflection, absorption and penetration. The reflection phenomenon will cause many optical defects, such as glare, ghosting, color cast and other problems, which will lead to the generation of stray light. Optical filters such as infrared cutoff filters are no exception and will also have the above problems.

[0004] In addition, the most widely used camera module is the mobile phone camera module, and the most critical technology for the mobile phone camera module is thinning (that is, the TTL should be low). However, due to the refractive index of the infrared cut-off filter, the path for light to enter the image sensor is invisibly increased, thereby increasing the height of the camera module, which invisibly increases the difficulty of the thinning technology.

[0005] There is no effective solution to the above problems yet. Summary of the invention

[0006] In view of this, an object of an embodiment of the present invention is to provide a camera module and a method for preparing the camera module, in order to solve the technical problems in the prior art that the camera module has stray light and the height of the camera module is difficult to reduce.

[0007] According to an embodiment of the present invention, a camera module is provided, comprising: a lens, an actuator and an image sensor, wherein the image sensor comprises a color filter covered with an organic dye composition, the organic dye composition is an organic dye composition obtained by mixing a polymer material with a dye and then adding a solvent to make it into a liquid state, and the organic dye composition is a non-glass material that allows high transmittance of visible light with a wavelength of 450 nanometers to 550 nanometers and absorbs visible light and near-infrared light with a wavelength of 550 nanometers to 850 nanometers.

[0008] Furthermore, the viscosity of the organic dye composition is within the following range: 1 mPa·s to 10 mPa·s (25° C.).

[0009] Furthermore, the coating thickness of the organic dye composition on the color filter is within the following range: 2.2 microns to 5.0 microns.

[0010] Furthermore, the organic dye composition is spin-coated on the color filter by a spin-coating device through a preset spin-coating method, wherein the preset spin-coating method is a method determined based on the following parameters: the rotation speed of the spin-coating device, the acceleration of the spin-coating device, the spin-coating time of the spin-coating device, and the amount of the organic dye composition spin-coated on the color filter determined based on the diameter of the color filter.

[0011] Furthermore, the dosage of the organic dye composition is in the following range: 0.1 g to 10 g; the rotation speed is in the following range: 850 rpm to 4000 rpm; and the acceleration is in the following range: 1 to 10 m / s2.

[0012] Furthermore, the organic dye composition is a material that has been previously subjected to a reaction treatment by a reaction device, and the treated organic dye composition is spin-coated on the color filter, wherein the reaction treatment includes: UV reaction treatment or thermal reaction treatment.

[0013] Furthermore, a deposition protection layer is provided on the organic dye composition covering the color filter, wherein the deposition protection layer has a thickness of 0.05 micrometer to 1 micrometer.

[0014] Furthermore, an IR cut-off film layer and an AR anti-reflection layer are pre-plated on the deposited protective layer, wherein the thickness of the IR cut-off film layer and the AR anti-reflection layer are both between 2500 nanometers and 6000 nanometers.

[0015] The camera module provided in the embodiment of the present invention includes a lens, an actuator and an image sensor, wherein the image sensor includes a color filter covered with an organic dye composition, wherein the organic dye composition is obtained by mixing a polymer material with a dye and then adding a solvent to make it liquid. In the embodiment of the present invention, the purpose of improving the camera module is achieved by coating the organic dye composition described above on the color filter to replace the infrared cutoff filter in the traditional camera module, and the technical problem of stray light generated by the infrared cutoff filter in the prior art can be solved, thereby achieving the technical effect of improving the stray light of the camera module and reducing the height of the camera module.

[0016] According to an embodiment of the present invention, a method for preparing a camera module is also provided. The camera module is prepared by the preparation method, and is characterized in that the preparation method comprises: obtaining an organic dye composition to be spin-coated, wherein the organic dye composition is an organic dye composition obtained by mixing a polymer material with a dye and then adding a solvent to make it into a liquid state, and the organic dye composition is a non-glass material that allows high transmittance of visible light with a wavelength of 450 nanometers to 550 nanometers and absorbs visible light and near-infrared light with a wavelength of 550 nanometers to 850 nanometers; spin-coating the organic dye composition on a color filter of the camera module to form an image sensor, and constructing the camera module based on the image sensor, lens and actuator.

[0017] Furthermore, spin coating the organic dye composition on the color filter of the camera module includes: spin coating on the color filter by a preset spin coating method, wherein the preset spin coating method is a method determined based on the following parameters: the rotation speed of the spin coating device, the acceleration of the spin coating device, the spin coating time of the spin coating device, and the amount of the organic dye composition spin coated on the color filter determined based on the diameter of the color filter.

[0018] The camera module provided in the embodiment of the present invention includes a lens, an actuator and an image sensor, wherein the image sensor includes a color filter covered with an organic dye composition, wherein the organic dye composition is obtained by mixing a polymer material with a dye and then adding a solvent to make it liquid. In the embodiment of the present invention, the purpose of improving the camera module is achieved by coating the organic dye composition described above on the color filter to replace the infrared cutoff filter in the traditional camera module, and the technical problem of stray light generated by the infrared cutoff filter in the prior art can be solved, thereby achieving the technical effect of improving the stray light of the camera module and reducing the height of the camera module.

[0019] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 is a structural diagram of a camera module provided according to an embodiment of the present invention;

[0023] Figure 2 is a line graph showing the relationship between the thickness and spectrum of the organic dye composition provided by an embodiment of the present invention;

[0024] Figure 3 is a comparative line chart showing that the penetration rate is effectively improved after the protective layer is deposited according to an embodiment of the present invention;

[0025] Figure 4 It is a line chart comparing the effects of infrared light on CCD or CMOS imaging before and after being coated with an IR cut-off film layer and an AR anti-reflection layer according to an embodiment of the present invention;

[0026] Figure 5 is a highly schematic diagram of a camera module when an infrared cutoff filter is present according to an embodiment of the present invention;

[0027] Figure 6 is a highly schematic diagram of a camera module without an infrared cutoff filter according to an embodiment of the present invention;

[0028] Figure 7 is a schematic structural diagram of a camera module when an infrared cutoff filter is provided in an embodiment of the present invention;

[0029] Figure 8 is a structural schematic diagram of a camera module without an infrared cutoff filter provided by an embodiment of the present invention;

[0030] Fig. 9 is the color diffraction MTF of the camera module with an infrared cutoff filter provided in an embodiment of the present invention;

[0031] Fig.10 is the color diffraction MTF of the camera module without the infrared cut-off filter provided by the embodiment of the present invention;

[0032] Fig.11 is a stray light test chart of a camera module with an infrared cutoff filter provided in an embodiment of the present invention;

[0033] Fig.12is a stray light test chart of a camera module without an infrared cutoff filter provided by an embodiment of the present invention;

[0034] Fig.13 The present invention provides a flow chart of a method for preparing a camera module. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Figure 1 is a structural diagram of a camera module provided according to an embodiment of the present invention, such as Figure 1 As shown, the camera module includes the following parts: a lens, an actuator and an image sensor, wherein the image sensor includes a color filter covered with an organic dye composition, the organic dye composition is an organic dye composition obtained by mixing a polymer material with a dye and then adding a solvent to make it into a liquid state, the organic dye composition is a non-glass material that can allow high transmittance of visible light with a wavelength of 450 nanometers to 550 nanometers and absorb visible light and near-infrared light with a wavelength of 550 nanometers to 850 nanometers. The actuator (also called a pressure actuator) is a control device widely used in camera modules for positions such as autofocus and image stabilization systems of digital cameras.

[0037] In the embodiment of the present invention, the main components of the polymer material are toluene, o-xylene, epoxy resin, dye, isopropyl alcohol, ethanol, silane monomer, etc.; since the dye has the ability to absorb specific wavelengths, after the polymer material and the dye are mixed, a solvent is added to the mixture to make it a liquid organic substance, thereby obtaining an organic dye composition having the following functions: allowing high transmittance of visible light (450 nanometers to 550 nanometers), and absorbing visible light with a wavelength of 550 nanometers to 850 nanometers and near-infrared light (700 nanometers to 1100 nanometers).

[0038] In the embodiments of the present invention, solvent refers to a liquid commonly used in the chemical field that can dissolve solid, liquid or gas solutes, usually has a relatively low boiling point and is easy to volatilize. Among them, organic solvents can be used as paint thinners, and "toluene" is the most important thinner in the present invention.

[0039] The camera module provided in the embodiment of the present invention includes a lens, an actuator and an image sensor, wherein the image sensor includes a color filter covered with an organic dye composition, wherein the organic dye composition is obtained by mixing a polymer material with a dye and then adding a solvent to make it liquid. In the embodiment of the present invention, the purpose of improving the camera module is achieved by coating the organic dye composition described above on the color filter to replace the infrared cutoff filter in the traditional camera module, and the technical problem of stray light generated by the infrared cutoff filter in the prior art can be solved, thereby achieving the technical effect of improving the stray light of the camera module and reducing the height of the camera module.

[0040] In an optional embodiment, the viscosity of the organic dye composition is within the following range: 1 mPa·s to 10 mPa·s (25° C.).

[0041] In the embodiment of the present invention, after the polymer material and the dye are mixed to obtain a mixture, a solvent can be added to the mixture to dilute the mixture into a liquid organic dye composition. In the embodiment of the present invention, the viscosity of the organic dye composition is optionally set to be between 1 mPa·s and 10 mPa·s (25° C.), the purpose of which is to make it close to the viscosity of water, 1 mPa·s, so as to cooperate with the subsequent spin coating process, so that the organic dye composition can be more evenly spin-coated on the color filter.

[0042] After obtaining the color filter spin-coated with the organic dye composition, the color filter spin-coated with the organic dye composition can be used to replace the infrared cutoff filter in the traditional camera module, so as to achieve the purpose of improving the camera module and solve the technical problem of the infrared cutoff filter generating stray light in the prior art, thereby achieving the technical effect of improving the stray light of the camera module and reducing the height of the camera module.

[0043] In another optional embodiment, the coating thickness of the organic dye composition on the color filter is within the following range: 2.2 microns to 5.0 microns.

[0044] From the above description, it can be seen that in the embodiment of the present invention, the coating thickness of the organic dye composition on the color filter is limited to between 2.2 microns and 5.0 microns. One purpose of controlling the thickness of the organic dye composition spin-coated on the color filter is to control the spectrum.

[0045] Specifically, according to the Lambert-Beer law, we know that: A = lg (1 / T) = Kbc. Among them: A is the absorbance; T is the transmittance (transmittance), which refers to the ratio of the outgoing light intensity (I) to the incident light intensity (I0); K is the molar absorption coefficient, which is related to the properties of the absorbing substance and the wavelength λ of the incident light; c is the concentration of the absorbing substance; b is the thickness of the absorbing layer (b is often replaced by L, with the same meaning).

[0046] Figure 2 is a line graph showing the relationship between the thickness and spectrum of the organic dye composition provided according to an embodiment of the present invention, such as Figure 2 As shown in Figure 2, when the thickness of the absorption layer b is thicker, the spectrum moves toward shorter wavelengths, such as Figure 2 The curve shown by number 21; the thinner the thickness, the shorter the wavelength, such as Figure 2 The curve shown by reference numeral 22 in FIG. Figure 2 In the figure, 640 is the thickness of curve 21, 650 is the thickness of curve 22, the abscissa of the graph is the wavelength, and the ordinate of the graph is the transmittance.

[0047] In the embodiments of the present invention, by controlling the spectrum, visible light penetration and near-infrared light cutoff can be controlled, so that the color filter covered with the organic dye composition can realize the function of the infrared cutoff filter, and the color filter covered with the organic dye composition replaces the infrared cutoff filter in the traditional camera module, thereby achieving the purpose of improving the camera module, and can solve the technical problem of stray light generated by the infrared cutoff filter in the prior art, thereby achieving the technical effect of improving the stray light of the camera module and reducing the height of the camera module.

[0048] In another optional embodiment, the organic dye composition is spin-coated on the color filter by a spin coating device through a preset spin coating method, wherein the preset spin coating method is a method determined based on the following parameters: the rotation speed of the spin coating device, the acceleration of the spin coating device, the spin coating time of the spin coating device, and the amount of the organic dye composition spin-coated on the color filter determined based on the diameter of the color filter.

[0049] In another optional embodiment, the amount of the organic dye composition is in the following range: 0.1 g to 10 g; the rotation speed is in the following range: 850 rpm to 4000 rpm; and the acceleration is in the following range: 1 to 10 m / s2.

[0050] In an embodiment of the present invention, the organic dye composition can be spin-coated on the color filter by a spin coating device according to a preset spin coating method. In an embodiment of the present invention, the preset spin coating method includes the rotation speed of the spin coating device, the acceleration of the spin coating device, the spin coating time of the spin coating device, and the amount of the organic dye composition spin-coated on the color filter determined based on the diameter of the color filter.

[0051] In the embodiment of the present invention, the preset spin coating method is set in the above manner, so that the organic dye composition can be more evenly spin-coated on the color filter, so that the actual working effect of the color filter coated with the organic dye composition is better.

[0052] In another optional embodiment, the organic dye composition is a material that has been previously subjected to a reaction treatment by a reaction device, and the treated organic dye composition is spin-coated on the color filter, wherein the reaction treatment includes: UV reaction treatment or thermal reaction treatment.

[0053] In the embodiment of the present invention, in order to make the organic dye composition and the color filter better cover, it is necessary to react the organic dye composition in advance, wherein the reaction method includes UV reaction treatment or thermal reaction treatment. Specifically, different reaction methods can be selected according to the production process of the product. For example, the semiconductor industry needs to use UV reaction treatment. The UV reaction type uses UV wavelength (320nm~390nm) to irradiate and give energy (mj / cm 2 ); In general production environments, thermal reaction type is used. The thermal reaction type uses heat energy (25-250 degrees) to cross-link the material itself. When the cross-linking of the product is completed, the qualitative change will no longer occur.

[0054] In the embodiment of the present invention, after the organic dye composition is subjected to reaction treatment by the reaction device, when the organic dye composition is spin-coated on the color filter, the organic dye composition can be spin-coated on the color filter better and more uniformly.

[0055] Specifically, a deposition protection layer is disposed on the organic dye composition covering the color filter, wherein the deposition protection layer has a thickness of 0.05 micrometers to 1 micrometer.

[0056] In the embodiment of the present invention, a protective layer can be deposited on the organic dye composition by using a CVD (chemical vapor deposition) process, and the deposited material is a silicon (SI) material. In the embodiment of the present invention, the purpose of setting the deposited protective layer includes the following two: one is to improve the transmittance; the other is to protect the organic dye composition.

[0057] like Figure 3 The figure is a comparative line chart showing the effective improvement of the penetration rate after the protective layer is deposited according to the embodiment of the present invention. Figure 3 It can be seen that the curve without the deposition protection layer is 32, and the curve with the deposition protection layer is 31. Figure 3It can be seen that when the thickness of the deposited protection layer (eg, the thickness of deposited SiO2) is set to 0.11 um, the transmittance of the organic dye composition increases by 3-4% compared to that without the deposited protection layer.

[0058] The CVD process has the following advantages: low deposition temperature, easy control of film composition, film thickness proportional to deposition time, good uniformity and density, and thus can isolate the organic dye composition from oxygen, prevent the organic dye composition from undergoing oxidation reaction with oxygen, and achieve the purpose of protecting the organic dye composition.

[0059] In another optional embodiment, an IR cut-off film layer and an AR anti-reflection layer are pre-coated on the deposited protective layer, wherein the thickness of the IR cut-off film layer and the AR anti-reflection layer are both between 2500 nanometers and 6000 nanometers.

[0060] like Figure 4 The figure is a line graph comparing the effects of infrared light on CCD or CMOS imaging before and after coating with an IR cut-off film layer and an AR anti-reflection layer according to an embodiment of the present invention. Figure 4 The middle curve 41 is a curve diagram without the IR cut-off film layer and the AR anti-reflection layer; Figure 4 The middle curve 42 is a curve diagram for setting an AR anti-reflection layer; Figure 4 The middle curve 43 is a curve diagram when an IR cut-off film layer is provided.

[0061] In an embodiment of the present invention, an IR cut-off film layer and an AR anti-reflection layer are coated on the deposited protective layer by using a PVD (physical vapor deposition) process, so that the organic dye composition has the function of an infrared cut-off filter. Among them, the infrared cut-off filter is an optical filter that uses precision optical coating technology to alternately coat optical films of high and low refractive indexes on an optical substrate to achieve high transmittance in the visible light region (400-630nm) and cut-off of near infrared (700-1100nm). It is mainly used in digital imaging fields such as camera phones, built-in cameras in computers, and car cameras to eliminate the influence of infrared light on CCD or CMOS imaging. In traditional camera modules, infrared cut-off filters are an indispensable component. In an embodiment of the present invention, the coated organic dye composition obtained by the PVD process can effectively replace the infrared cut-off filter.

[0062] In an embodiment of the present invention, a traditional camera module is modified into a lens, an actuator and an image sensor, wherein the image sensor includes a color filter covered with an organic dye composition, wherein the organic dye composition is obtained by mixing a polymer material with a dye and then adding a solvent to make it liquid. The organic dye composition is then coated on the color filter using a coating process to replace the infrared cutoff filter in the traditional camera module, thereby achieving the purpose of improving the camera module, and further solving the technical problem of stray light generated by the infrared cutoff filter in the prior art, thereby achieving the technical effect of improving the stray light of the camera module and reducing the height of the camera module.

[0063] The following will introduce the technical effect achieved by the above camera module in conjunction with a complete embodiment. Specifically, the technical effect of reducing the lens height is achieved as follows:

[0064] In an optional embodiment, when a 13M1 / 3.06-inch CMOS image sensor is used, Figure 5 FIG. 1 is a highly schematic diagram of a camera module when an infrared cutoff filter is provided according to an embodiment of the present invention. Figure 5 As shown in FIG. 1 , when there is an infrared cut-off filter in the camera module, the path that light needs to travel to reach the image sensor after entering the lens is 4.18 mm, that is, the height of the lens with the infrared cut-off filter is 4.18 mm, and the thickness of the infrared cut-off filter is 0.21 mm. Figure 7 What is shown is a schematic diagram of the structure of the camera module when an infrared cut-off filter is present.

[0065] like Figure 6 FIG. 1 is a schematic diagram of a camera module according to an embodiment of the present invention after removing the infrared cut-off filter. Figure 6 As shown, after light enters the lens, the distance required for the light to reach the image sensor through the color filter covered with the organic dye composition provided by the present invention is 3.82 mm, which is Figure 5 Compared with the camera module height shown in FIG. 1 , the lens height is shortened by 0.36 mm, which proves that the embodiment of the present invention achieves the technical effect of reducing the camera module height. Figure 8 The figure shows the structure of the camera module when the infrared cut-off filter is removed. Figure 7 and Figure 8 In, and Figure 5 and Figure 6It can be seen that after replacing the infrared cut-off filter with a color filter covered with an organic dye composition, the height of the camera module lens can be reduced, making the camera lens thinner and lighter. If this camera is installed on a smartphone, it can make the smartphone thinner and lighter; if this camera is installed on a smart tablet, it can make the smart tablet thinner and lighter.

[0066] like Fig. 9 and Fig.10 As shown in FIG. 1 , they are respectively the color diffraction MTF (modulation transfer function) of the camera module with an infrared cutoff filter provided according to an embodiment of the present invention and the color diffraction MTF (modulation transfer function) of the camera module without the infrared cutoff filter, Fig. 9 and Fig.10 It can be seen that the MTFs of the two are equivalent, and the focal lengths are also equivalent. Therefore, under the premise that the MTF and focal length are equivalent, removing the infrared cutoff filter and using the color filter covered with the organic dye composition provided by the embodiment of the present invention can shorten the lens height by 0.36 mm, proving that the embodiment of the present invention achieves the technical effect of reducing the height of the camera module.

[0067] Specifically, the technical effect of improving stray light is achieved as follows:

[0068] like Fig.11 and Fig.12 As shown in FIG. 1 , there are stray light test diagrams of a camera module with an infrared cutoff filter provided in an embodiment of the present invention and stray light test diagrams of a camera module without the infrared cutoff filter provided in FIG. Fig.11 and Fig.12 It can be clearly seen that, since there is a reflected light path due to the infrared cut-off filter, after the infrared cut-off filter is removed, the reflected light path does not exist, and the stray light is significantly improved.

[0069] According to an embodiment of the present invention, a method for preparing a camera module is also provided. The camera module is prepared by using the method. Fig.13 As shown, the method comprises the following steps:

[0070] Step S1302, obtaining an organic dye composition to be spin-coated, wherein the organic dye composition is obtained by mixing a polymer material and a dye, and then adding a solvent to make it liquid, and the organic dye composition is a non-glass material that allows high transmittance of visible light with a wavelength of 450 nanometers to 550 nanometers and absorbs visible light and near-infrared light with a wavelength of 550 nanometers to 850 nanometers;

[0071] Step S1304, spin-coating the organic dye composition onto the color filter of the camera module to form an image sensor, and constructing the camera module based on the image sensor, lens and actuator.

[0072] In an embodiment of the present invention, the purpose of improving the camera module is achieved by coating the organic dye composition described above on a color filter to replace the infrared cutoff filter in a traditional camera module. The technical problem of stray light generated by the infrared cutoff filter in the prior art can be solved, thereby achieving the technical effect of improving the stray light of the camera module and reducing the height of the camera module.

[0073] In an optional embodiment, spin coating the organic dye composition on the color filter of the camera module comprises the following steps:

[0074] The color filter is spin coated by a preset spin coating method, wherein the preset spin coating method is a method determined based on the following parameters: the rotation speed of the spin coating device, the acceleration of the spin coating device, the spin coating time of the spin coating device, and the amount of the organic dye composition spin coated on the color filter determined based on the diameter of the color filter.

[0075] In an embodiment of the present invention, before the organic dye composition is spin-coated on the color filter, the organic dye composition can be pre-reaction-treated by a reaction device; then, the treated organic dye composition is spin-coated on the color filter, wherein the reaction treatment includes: UV reaction treatment or thermal reaction treatment.

[0076] In the embodiment of the present invention, after the organic dye composition is spin-coated on the color filter, a protective layer can be deposited on the organic dye composition by using a CVD (chemical vapor deposition) process, and the deposited material is a silicon (SI) material. In the embodiment of the present invention, the purpose of setting the deposited protective layer includes the following two: one is to improve the transmittance; the other is to protect the organic dye composition.

[0077] The CVD process has the following advantages: low deposition temperature, easy control of film composition, film thickness proportional to deposition time, good uniformity and density, and thus can isolate the organic dye composition from oxygen, prevent the organic dye composition from undergoing oxidation reaction with oxygen, and achieve the purpose of protecting the organic dye composition.

[0078] In an embodiment of the present invention, after depositing a protective layer on the organic dye composition, a PVD (physical vapor deposition) process can be used to coat an IR cut-off film layer and an AR anti-reflection layer on the deposited protective layer, so that the organic dye composition has the function of an infrared cut-off filter. Among them, the infrared cut-off filter is an optical filter that uses precision optical coating technology to alternately coat optical films of high and low refractive indexes on an optical substrate to achieve high transmittance in the visible light region (400-630nm) and cut off near infrared (700-1100nm). It is mainly used in digital imaging fields such as camera phones, built-in cameras in computers, and car cameras to eliminate the influence of infrared light on CCD or CMOS imaging. In traditional camera modules, infrared cut-off filters are an indispensable component. In an embodiment of the present invention, the coated organic dye composition obtained by the PVD process can effectively replace the infrared cut-off filter.

[0079] The above implementation process will be described below in conjunction with a complete embodiment. Specifically, the process of manufacturing a color filter covered with an organic dye composition is as follows:

[0080] 1. First, inject the organic dye composition into a test tube.

[0081] 2. Then, the organic dye composition injected into the test tube is injected onto the color filter through the installed filter, wherein the injection process is completed using a quantitative dispensing system, and the specific process includes: compressed air is sent into the glue bottle (syringe), and the glue (i.e., the organic dye composition) is pressed into the feed tube connected to the piston chamber. When the piston is in the upward stroke, the piston chamber is filled with glue. When the piston pushes the glue drop needle downward, the glue is pressed out from the needle nozzle. The amount of glue dripping can be determined by the air pressure and time of the compressed air.

[0082] 3. Next, the organic dye composition injected into the test tube is injected onto the color filter through the installed filter, and the organic dye composition is coated using a coating process. Specifically, the thickness of the organic dye composition can be controlled by adjusting the rotation speed, acceleration and time of the coating device. The thickness ranges from 1 micron to 5 microns, and the coating process used is a spin coating process.

[0083] 4. Next, a protective layer is deposited on the organic dye composition using CVD (chemical vapor deposition) technology, wherein the thickness of the deposited protective layer is 0.05 micrometers to 1 micrometer.

[0084] 5. Next, using PVD (physical vapor deposition) technology, an IR cutoff film layer and an AR anti-reflection layer are evaporated on top of the deposited protective layer, wherein the thickness of the IR cutoff film layer and the AR anti-reflection layer are both 2,500 nanometers to 6,000 nanometers.

[0085] 6. Finally, the color filter coated with the organic dye composition is completed.

[0086] After obtaining the color filter spin-coated with the organic dye composition, the color filter spin-coated with the organic dye composition can be used to replace the infrared cutoff filter in the traditional camera module, so as to achieve the purpose of improving the camera module and solve the technical problem of the infrared cutoff filter generating stray light in the prior art, thereby achieving the technical effect of improving the stray light of the camera module and reducing the height of the camera module.

[0087] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A camera module, characterized in that: include: A lens, an actuator and an image sensor, wherein the image sensor comprises a color filter covered with an organic dye composition, wherein the organic dye composition is obtained by mixing a polymer material with a dye and then adding a solvent to make it liquid, wherein the organic dye composition is a non-glass material that allows high transmittance of visible light with a wavelength of 450 nanometers to 550 nanometers and absorbs visible light and near-infrared light with a wavelength of 550 nanometers to 850 nanometers; The organic dye composition is spin-coated on the color filter by a spin coating device through a preset spin coating method, wherein the preset spin coating method is a method determined based on the following parameters: a rotation speed of the spin coating device, an acceleration of the spin coating device, a spin coating time of the spin coating device, and an amount of the organic dye composition spin-coated on the color filter determined based on the diameter of the color filter; The organic dye composition is a material that has been previously subjected to a reaction treatment by a reaction device, and the organic dye composition after the treatment is spin-coated on the color filter, wherein the reaction treatment includes: UV reaction treatment or thermal reaction treatment; A deposition protection layer is disposed on the organic dye composition covering the color filter, wherein the deposition protection layer has a thickness of 0.05 micrometer to 1 micrometer; An IR cut-off film layer and an AR anti-reflection layer are pre-plated on the deposited protective layer, wherein the thickness of the IR cut-off film layer and the AR anti-reflection layer are both between 2500 nanometers and 6000 nanometers.

2. The camera module according to claim 1, characterized in that: The viscosity of the organic dye composition is within the following range: 1 mPa·s to 10 mPa·s (25° C.).

3. The camera module according to claim 1, characterized in that: The coating thickness of the organic dye composition on the color filter is within the following range: 2.2 microns to 5.0 microns.

4. The camera module according to claim 1, characterized in that: The dosage of the organic dye composition is in the following range: 0.1 g to 10 g; the rotation speed is in the following range: 850 rpm to 4000 rpm; and the acceleration is in the following range: 1 to 10 m / s2.

5. A method for preparing a camera module, wherein the camera module according to any one of claims 1 to 4 is prepared by the method, wherein: The method comprises: Obtaining an organic dye composition to be spin-coated, wherein the organic dye composition is obtained by mixing a polymer material and a dye and then adding a solvent to make it liquid, and the organic dye composition is a non-glass material that allows high transmittance of visible light with a wavelength of 450 nanometers to 550 nanometers and absorbs visible light and near-infrared light with a wavelength of 550 nanometers to 850 nanometers; Spin-coating the organic dye composition onto a color filter of the camera module to form an image sensor, and constructing the camera module based on the image sensor, a lens and an actuator; Spin coating the organic dye composition on the color filter of the camera module comprises: Spin coating the color filter by a preset spin coating method, wherein the preset spin coating method is a method determined based on the following parameters: a rotation speed of a spin coating device, an acceleration of the spin coating device, a spin coating time of the spin coating device, and an amount of the organic dye composition spin coated on the color filter determined based on the diameter of the color filter; The organic dye composition is a material that has been previously subjected to a reaction treatment by a reaction device, and the organic dye composition after the treatment is spin-coated on the color filter, wherein the reaction treatment includes: UV reaction treatment or thermal reaction treatment; A deposition protection layer is disposed on the organic dye composition covering the color filter, wherein the deposition protection layer has a thickness of 0.05 micrometer to 1 micrometer; An IR cut-off film layer and an AR anti-reflection layer are pre-plated on the deposited protective layer, wherein: The thickness of the IR cut-off film layer and the AR anti-reflection layer are both between 2500 nanometers and 6000 nanometers.

Images