Fingerprint lens under 3P ultrathin screen

Abstract

The invention provides a fingerprint lens under a 3P ultrathin screen. The fingerprint lens under the 3P ultrathin screen comprises a first lens, an aperture diaphragm, a second lens and a third lens which are sequentially arranged from an object side to an image side along an optical axis, the first lens is a negative lens having an object-side surface being concave in a paraxial region and an image-side surface being convex in a paraxial region. The second lens is a positive lens of which the object-side surface is convex in a paraxial region; the third lens is a positive lens having an object-side surface being convex in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof. The 3P ultra-thin screen lower fingerprint lens meets the requirements of smaller distortion and shorter total length, reduces the material cost and the assembly cost, improves the production efficiency, is matched with a new design architecture and a brand new film system, and is light in size and excellent in mass production.

Description

Technical Field

[0001] This invention relates to the field of optical devices, and more specifically, to a 3P ultra-thin under-display fingerprint lens. Background Technology

[0002] With the widespread use of electronic products such as smartphones, tablets, and smart locks, fingerprint recognition technology is gradually becoming more common, and the market demand for miniaturized, low-distortion under-display fingerprint lenses is increasing. In existing technologies, optical lenses used for under-display fingerprint recognition suffer from poor image quality and high distortion, resulting in low fingerprint recognition rates and impacting user experience. Furthermore, traditional optical lenses often use high-refractive-index materials, leading to higher production costs and hindering market adoption.

[0003] To meet market demand for ultra-thin, high-performance in-display fingerprint lenses, the 3P ultra-thin in-display fingerprint lens was developed. One of the main objectives of the 3P ultra-thin in-display fingerprint lens is to achieve ultra-thinness. Through optimized optical design and the use of new materials and processes, it effectively reduces lens thickness while improving image quality and reducing distortion. This, in turn, enhances the speed and accuracy of fingerprint recognition, reduces the false recognition rate, and provides users with a faster, more convenient, and secure unlocking experience. The ultra-thin design not only improves the overall aesthetics of electronic products but also enhances the user's grip and portability, aligning with the modern trend towards thinner and lighter electronic products.

[0004] Currently, the most common 3P ultra-thin under-display fingerprint lenses on the market include traditional 3P lenses, 3P microlens combination lenses, and 3P wafer-level optical lenses. Among them, traditional 3P lenses have a simple structure, but their image quality needs improvement; 3P microlens combination lenses optimize light collection through microlens arrays to improve image quality; and 3P wafer-level optical lenses achieve ultra-thinness by utilizing semiconductor technology, reducing module thickness.

[0005] Specifically, traditional 3P lenses have several drawbacks: while simple in structure, they suffer from numerous defects. First, image quality is poor. Due to their relatively basic optical design, they struggle to effectively correct various aberrations, resulting in insufficient image clarity and difficulty in accurately capturing fingerprint details, thus affecting the accuracy and reliability of fingerprint recognition. Second, distortion is significant, especially at the lens edges, where the distortion problem is more pronounced. This distorts the geometry of the fingerprint image, further reducing the accuracy of fingerprint recognition.

[0006] The limitations of 3P microlens array lenses: While optimizing light collection through microlens arrays improves image quality to some extent, these lenses also have significant drawbacks. Firstly, light collection efficiency is limited. Although microlens arrays can converge and optimize light to a certain degree, in practical applications, some light is still lost due to multiple refractions and reflections, preventing the light collection efficiency from reaching the ideal state and thus affecting image brightness and sharpness. Secondly, the cost is high. The fabrication and assembly of microlens arrays are complex, requiring high-precision equipment and technical support, which significantly increases production costs and hinders large-scale promotion and application.

[0007] The drawbacks of 3P wafer-level optical lenses: While semiconductor technology enables ultra-thin lenses and effectively reduces module thickness, meeting the demand for thinner and lighter electronic products, its disadvantages cannot be ignored. First, the process is complex. The production of wafer-level optical lenses requires advanced semiconductor manufacturing processes involving multiple complex steps, such as photolithography, etching, and thin-film deposition. These processes place extremely high demands on production equipment and process control; even slight errors can lead to product defects. Second, the yield is low. Due to the complexity and high precision requirements of the process, various problems can easily occur during production, such as wafer surface defects, uneven film thickness, and incomplete etching. These problems can all lead to product defects, significantly reducing the yield and increasing production costs and time.

[0008] Therefore, how to further optimize the 3P ultra-thin under-display fingerprint lens to achieve excellent performance while maintaining low cost, so as to meet the development needs of electronic devices, has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0009] This invention addresses the technical problems existing in the prior art by proposing a 3P ultra-thin under-display fingerprint lens. This solves the technical problem that existing under-display fingerprint lenses are unable to achieve an ideal balance in terms of imaging quality, cost control, and production efficiency, and thus cannot fully meet the market's demand for high-performance, low-cost, and high-yield ultra-thin under-display fingerprint lenses.

[0010] The technical solution provided by this invention is as follows:

[0011] A 3P ultra-thin under-display fingerprint lens includes a first lens, an aperture stop, a second lens, and a third lens arranged sequentially from the object side along the optical axis to the image side.

[0012] The first lens is a negative lens with a concave surface near the optical axis on the object side and a convex surface near the optical axis on the image side;

[0013] The second lens is a positive lens whose object-side surface is convex near the optical axis;

[0014] The third lens is a positive lens with a convex surface near the optical axis on both the object-side and image-side surfaces.

[0015] Based on the above technical solution, the present invention can also be improved as follows.

[0016] Optionally, the focal length of the third lens is f3, and the focal length of the lens is f, satisfying the following conditions:

[0017] 1.498 <f3 / f<2.407。

[0018] The third lens has an image-side radius of curvature of R(L3S2) and a focal length of f, satisfying the following conditions:

[0019] 1.267 <R(L3S2) / f<3.767。

[0020] The second lens has a focal length of f2, and the lens focal length is f, satisfying the following condition:

[0021] 2.837 <f2 / f<10.234。

[0022] The combined focal length of the second lens and the third lens is f23, and the focal length of the lens is f, satisfying the following condition:

[0023] 1.444 <f23 / f<1.508。

[0024] The total optical length TTL of the lens optical system of the 3P ultra-thin under-display fingerprint lens, and the core thickness T(L3) of the third lens, satisfy the following conditions:

[0025] 0.078≤T(L3) / TTL<0.137.

[0026] The 3P ultra-thin under-display fingerprint lens provided by this invention combines an aperture stop and three lenses according to a specific surface shape and a reasonable distribution of optical power, and has the following beneficial effects:

[0027] This lens complements the existing 3P ultra-thin under-display fingerprint lenses on the market. One of the main invention goals of the 3P ultra-thin under-display fingerprint lens is to achieve ultra-thinness. By rationally designing the lens structure and materials, and optimizing the optical system, the overall length of the lens (conventional TTL>2.1) is significantly reduced, thus meeting the stringent space requirements of modern electronic products. Furthermore, by using aspherical plastic lenses and optimized lens combinations, aberrations and distortions are effectively reduced, improving image clarity and accuracy. Moreover, the cost is lower, while other performance characteristics remain unchanged or are even improved.

[0028] In summary, this 3P ultra-thin under-display fingerprint lens achieves smaller distortion, shorter overall length, reduced material and assembly costs, and improved production efficiency. Combined with a new design architecture and a brand-new film system, it is compact and has excellent mass production capabilities. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 1 of the present invention;

[0030] Figure 2 This is a schematic diagram of the MFT performance of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 1 of the present invention;

[0031] Figure 3 This is the MTF defocus curve of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 1 of the present invention;

[0032] Figure 4 This is a schematic diagram of light distortion and field curvature at any pupil of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 1 of the present invention;

[0033] Figure 5 The relative illumination diagram of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 1 of the present invention;

[0034] Figure 6 This is a schematic diagram of the structure of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 2 of the present invention;

[0035] Figure 7 This is a schematic diagram of the MFT performance of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 2 of the present invention;

[0036] Figure 8 This is the MTF defocus curve of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 2 of the present invention;

[0037] Figure 9 This is a schematic diagram of light distortion and field curvature at any pupil of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 2 of the present invention.

[0038] Figure 10 The relative illumination diagram of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 2 of the present invention;

[0039] Figure 11 This is a schematic diagram of the structure of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 3 of the present invention;

[0040] Figure 12 This is a schematic diagram of the MFT performance of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 3 of the present invention;

[0041] Figure 13This is the MTF defocus curve of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 3 of the present invention;

[0042] Figure 14 This is a schematic diagram of light distortion and field curvature at any pupil of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 3 of the present invention.

[0043] Figure 15 The relative illumination diagram of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 3 of the present invention;

[0044] Figure 16 This is a schematic diagram of the structure of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 4 of the present invention;

[0045] Figure 17 This is a schematic diagram of the MFT performance of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 4 of the present invention;

[0046] Figure 18 This is the MTF defocus curve of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 4 of the present invention;

[0047] Figure 19 This is a schematic diagram of light distortion and field curvature at any pupil of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 4 of the present invention.

[0048] Figure 20 The relative illumination diagram of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 4 of the present invention;

[0049] Figure 21 This is a schematic diagram of the structure of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 5 of the present invention;

[0050] Figure 22 This is a schematic diagram of the MFT performance of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 5 of the present invention;

[0051] Figure 23 This is the MTF defocus curve of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 5 of the present invention;

[0052] Figure 24 This is a schematic diagram of light distortion and field curvature at any pupil of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 5 of the present invention.

[0053] Figure 25 The relative illumination diagram of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 5 of the present invention;

[0054] Figure 26 This is a schematic diagram of the structure of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 6 of the present invention;

[0055] Figure 27This is a schematic diagram of the MFT performance of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 6 of the present invention;

[0056] Figure 28 This is the MTF defocus curve of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 6 of the present invention;

[0057] Figure 29 This is a schematic diagram of light distortion and field curvature at any pupil of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 6 of the present invention.

[0058] Figure 30 The relative illumination diagram of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 6 of the present invention;

[0059] Figure 31 This is a schematic diagram of the structure of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 7 of the present invention;

[0060] Figure 32 This is a schematic diagram of the MFT performance of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 7 of the present invention;

[0061] Figure 33 This is the MTF defocus curve of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 7 of the present invention;

[0062] Figure 34 This is a schematic diagram of light distortion and field curvature at any pupil of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 7 of the present invention.

[0063] Figure 35 The relative illumination diagram of the 3P ultra-thin under-display fingerprint lens provided in Embodiment 7 of the present invention;

[0064] Figure 36 This is a structural schematic diagram of the 3P ultra-thin under-display fingerprint lens provided as a comparative example of the present invention.

[0065] Figure 37 A schematic diagram of the MFT performance of the 3P ultra-thin under-display fingerprint lens provided as a comparative example of the present invention;

[0066] Figure 38 MTF defocus curve of the 3P ultra-thin under-display fingerprint lens provided as a comparative example of the present invention;

[0067] Figure 39 This is a schematic diagram illustrating the distortion and field curvature of light at any aperture of the 3P ultra-thin under-display fingerprint lens, provided as a comparative example of the present invention.

[0068] Figure 40 The relative illumination diagram of the 3P ultra-thin under-display fingerprint lens provided as a comparative example of the present invention;

[0069] The attached diagram lists the components represented by each number as follows:

[0070] STO, aperture stop; L1, first lens; L2, second lens; L3, third lens. Detailed Implementation

[0071] To make the objectives, 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 accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0072] Description of relevant feature parameters in this invention:

[0073] TTL is the total optical length of the lens optical system (the distance from the center point of the first lens surface to the center point of the image surface on the central optical axis);

[0074] f1 is the focal length of the first lens;

[0075] f2 is the focal length of the second lens;

[0076] f3 is the focal length of the third lens;

[0077] f23 is the focal length of the combined lens of the second and third lenses;

[0078] f is the lens focal length (focal length is a measure of the convergence or divergence of light in an optical system; it refers to the distance from the optical center of the lens to the focal point where parallel light converges when incident).

[0079] This invention provides a 3P ultra-thin under-display fingerprint lens, such as... Figure 1 As shown, the perspective lens includes three lenses, arranged from the object side along the optical axis to the image side, in the following order: first lens, aperture stop, second lens, and third lens.

[0080] The first lens is a negative lens with a concave surface near the optical axis on the object side and a convex surface near the optical axis on the image side;

[0081] The second lens is a positive lens whose object-side surface is convex near the optical axis;

[0082] The third lens is a positive lens with a convex surface near the optical axis on both the object-side and image-side surfaces.

[0083] Based on the above technical solution, the present invention can also be improved as follows.

[0084] The third lens has a focal length of f3, and the lens focal length is f, satisfying the following conditions:

[0085] 1.498 <f3 / f<2.407。

[0086] The third lens has an image-side radius of curvature of R(L3S2) and a focal length of f, satisfying the following conditions:

[0087] 1.267 <R(L3S2) / f<3.767。

[0088] The second lens has a focal length of f2, and the lens focal length is f, satisfying the following condition:

[0089] 2.837 <f2 / f<10.234。

[0090] The combined focal length of the second lens and the third lens is f23, and the focal length of the lens is f, satisfying the following condition:

[0091] 1.444 <f23 / f<1.508。

[0092] The total optical length TTL of the lens optical system of the 3P ultra-thin under-display fingerprint lens, and the core thickness T(L3) of the third lens, satisfy the following conditions:

[0093] 0.078≤T(L3) / TTL≤0.137.

[0094] Example 1

[0095] This embodiment provides a structure for a 3P ultra-thin under-display fingerprint lens, as shown below. Figure 1 As shown in the table below, the lens data of the 3P ultra-thin under-display fingerprint lens in this embodiment are as follows:

[0096]

[0097]

[0098] The formula for aspherical surfaces is as follows:

[0099]

[0100] Where z represents the point on the aspherical surface at a distance h from the optical axis, and its relative distance to the tangent plane at the vertex on the optical axis of the aspherical surface; c represents the vertex curvature, which is the reciprocal of the radius of curvature R at the vertex (c = 1 / R); h represents the distance between the point on the aspherical surface and the optical axis; k represents the conic coefficient; and Ai represents the i-th order aspherical coefficient.

[0101] The aspherical coefficients are as follows:

[0102]

[0103]

[0104] The characteristic parameter values ​​of the miniaturized 3P large-aperture infrared lens in this embodiment are shown in the table below:

[0105]

[0106] All of the above feature parameters fall within the following parameter range:

[0107] 1.498 <f3 / f<2.407;

[0108] 1.267 <R(L3S2) / f<3.767;

[0109] 2.837 <f2 / f<10.234;

[0110] 1.444 <f23 / f<1.508;

[0111] 0.078≤T(L3) / TTL<0.137.

[0112] Structural description: The L1S1 surface and the L1S2 surface form the L1 lens, the L2S1 surface and the L2S2 surface form the L2 lens, and the L3S1 surface and the L3S2 surface form the L3 lens.

[0113] It should be noted that the full name of the modulation transfer function (MTF) is Modulation Transfer Function. MTF comprehensively reflects the contrast and resolution characteristics of a lens. It is measured by instruments, which can completely eliminate the influence of objective factors such as film and subjective factors of human interpretation.

[0114] MTF (Mean Transmission Formatting) is one of the best tools for quantifying the overall imaging performance of a system in terms of resolution and contrast. A higher MTF value indicates a higher system resolution and the ability to convey finer details. MTF is a method of combining resolution and contrast into a single specification or rule. An MTF curve displays both resolution and contrast information simultaneously, allowing it to evaluate lenses according to the needs of a specific application and to compare the performance of multiple lenses.

[0115] Figure 2 The image shows the MTF performance of the 3P ultra-thin under-display fingerprint lens in Example 1 at a specified frequency. The X and Y axes represent the following: the horizontal axis (0-66 lp / mm) represents different density levels; the vertical axis (0-1.0) represents lens performance. A higher MTF curve indicates a higher lens MTF score and better performance. Higher density MTF curves result in a higher score and a stronger ability to observe small objects.

[0116] The meanings of solid and dashed lines: Solid lines represent the MTF curve generated parallel to the diameter direction, called the sagittal curve; dashed lines represent the MTF curve generated perpendicular to the diameter direction, called the meridional curve. The closer the solid and dashed lines are, the closer the MTF performance of the lens is in the meridional and sagittal directions, and the better the lens performance.

[0117] Different solid / dashed line groups represent different field of view heights. A field of view height of 0 indicates the center of the lens. The larger the field of view height, the farther away from the center. The MTF performance of each line is closer, indicating good consistency between the center and the edge of the lens.

[0118] Figure 3 The image shows the MTF defocus curve of the 3P ultra-thin under-display fingerprint lens in Example 1, which is a schematic diagram of the FFT modulation transfer function data of the defocus change at a specified frequency. It can be seen that the more concentrated the curve is and the higher the peak value is, the better the corresponding lens imaging effect.

[0119] Figure 4 This is a schematic diagram of light distortion and field curvature at any pupil of the 3P ultra-thin under-display fingerprint lens in Example 1. Wave represents the distortion and field curvature of light at any pupil in any field of view at any wavelength. The field curvature diagram on the left shows the curve of the distance from the image plane to the paraxial image plane as a function of the field of view coordinates. The distortion diagram on the right shows the difference between the real image height and the ideal image height in each field of view. The closer to the center, the better the imaging effect.

[0120] Figure 5 This is a relative illumination diagram of the 3P ultra-thin under-display fingerprint lens in Example 1. The higher the value, the better the relative illumination.

[0121] Example 2

[0122] This embodiment provides a structure for a 3P ultra-thin under-display fingerprint lens, as shown below. Figure 6 As shown in the table below, the lens data of the 3P ultra-thin under-display fingerprint lens in this embodiment are as follows:

[0123] The formula for aspherical surfaces is as follows:

[0124]

[0125]

[0126] Where z represents the point on the aspherical surface at a distance h from the optical axis, and its relative distance to the tangent plane at the vertex on the optical axis of the aspherical surface; c represents the vertex curvature, which is the reciprocal of the radius of curvature R at the vertex (c = 1 / R); h represents the distance between the point on the aspherical surface and the optical axis; k represents the conic coefficient; and Ai represents the i-th order aspherical coefficient.

[0127] The aspherical coefficients are as follows:

[0128] Surface serial number 1 2 3 4 5 6 Surface name L1s1 L1s2 L2s1 L2s2 L3s1 L3s2 R -6.224E-01 7.035E-01 1.192E+00 -9.498E+00 8.046E-01 -3.289E-01 K -1.012E+01 -8.181E+00 4.820E+00 0.000E+00 -1.507E+02 -2.024E-01 A4 3.853E+00 1.352E+00 -1.429E+01 -1.506E+01 -1.510E+01 6.804E-01 A6 -1.642E+01 4.457E+02 9.906E+02 1.726E+02 2.091E+02 6.090E+01 A8 4.232E+01 -9.659E+03 -4.147E+04 -2.450E+03 -1.913E+03 -3.984E+02 A10 -4.151E+01 9.885E+04 5.658E+05 5.488E+03 -1.750E+04 3.548E+02 A12 -1.175E+01 -3.471E+05 0.000E+00 -3.487E+05 -2.542E+04 -7.407E+04 A14 -1.898E+01 0.000E+00 0.000E+00 6.019E+06 2.503E+06 1.296E+06 A16 4.950E+01 0.000E+00 0.000E+00 3.378E+06 1.699E+07 -3.449E+06 A18 3.046E+02 0.000E+00 0.000E+00 -7.135E+08 -2.856E+07 6.739E+06 A20 -4.524E+01 0.000E+00 0.000E+00 4.790E+09 -1.651E+09 -7.961E+07 A22 -8.819E+02 0.000E+00 0.000E+00 0.000E+00 1.810E+09 -1.136E+09 A24 -7.502E+02 0.000E+00 0.000E+00 0.000E+00 0.000E+00 -4.715E+07 A26 9.191E+02 0.000E+00 0.000E+00 0.000E+00 0.000E+00 5.853E+10 A28 4.772E+03 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 A30 -4.954E+03 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00

[0129] The characteristic parameter values ​​of the miniaturized 3P large-aperture infrared lens in this embodiment are shown in the table below:

[0130] f3＝ 0.462 f＝ 0.291 f3 / f = 1.5850 R(L3S2)= -0.329 f＝ 0.291 R(L3S2) / f= -1.1293 f2＝ 1.951 f＝ 0.291 f2 / f = 6.6997 f23＝ 0.429 f＝ 0.291 f23 / f= 1.4720 T(L3)= 0.246 TTL = 1.797 T(L3) / TTL= 0.1370

[0131] All of the above feature parameters fall within the following parameter range:

[0132] 1.498 <f3 / f<2.407;

[0133] 1.267 <R(L3S2) / f<3.767;

[0134] 2.837 <f2 / f<10.234;

[0135] 1.444 <f23 / f<1.508;

[0136] 0.078≤T(L3) / TTL≤0.137.

[0137] Structural description: The L1S1 surface and the L1S2 surface form the L1 lens, the L2S1 surface and the L2S2 surface form the L2 lens, and the L3S1 surface and the L3S2 surface form the L3 lens.

[0138] Figure 7 The image shows the MTF performance of the 3P ultra-thin under-display fingerprint lens in Example 2 at a specified frequency. The X and Y axes represent the following: the horizontal axis represents different density levels (0-66 lp / mm); the vertical axis represents lens performance from 0 to 1.0. A higher MTF curve indicates a higher lens MTF score and better performance. A higher density MTF curve score indicates a stronger ability to observe small objects.

[0139] The meanings of solid and dashed lines: Solid lines represent the MTF curve generated parallel to the diameter direction, called the sagittal curve; dashed lines represent the MTF curve generated perpendicular to the diameter direction, called the meridional curve. The closer the solid and dashed lines are, the closer the MTF performance of the lens is in the meridional and sagittal directions, and the better the lens performance.

[0140] Different solid / dashed line groups represent different field of view heights. A field of view height of 0 indicates the center of the lens. The larger the field of view height, the farther away from the center. The MTF performance of each line is closer, indicating good consistency between the center and the edge of the lens.

[0141] Figure 8 The image shows the MTF defocus curve of the 3P ultra-thin under-display fingerprint lens in Example 2, which is a schematic diagram of the FFT modulation transfer function data of the defocus change at a specified frequency. It can be seen that the more concentrated the curve is and the higher the peak value is, the better the corresponding lens imaging effect.

[0142] Figure 9 This is a schematic diagram of light distortion and field curvature at any pupil of the 3P ultra-thin under-display fingerprint lens in Example 2. Wave represents the distortion and field curvature of light at any pupil in any field of view. The field curvature diagram on the left shows the curve of the distance from the image plane to the paraxial image plane as a function of the field of view coordinates. The distortion diagram on the right shows the difference between the real image height and the ideal image height in each field of view. The closer to the center, the better the imaging effect.

[0143] Figure 10 This is a relative illumination diagram of the 3P ultra-thin under-display fingerprint lens in Example 2. The higher the value, the better the relative illumination.

[0144] Example 3

[0145] This embodiment provides a structure for a 3P ultra-thin under-display fingerprint lens, as shown below. Figure 11 As shown in the table below, the lens data of the 3P ultra-thin under-display fingerprint lens in this embodiment are as follows:

[0146] The formula for aspherical surfaces is as follows:

[0147]

[0148]

[0149] Where z represents the point on the aspherical surface at a distance h from the optical axis, and its relative distance to the tangent plane at the vertex on the optical axis of the aspherical surface; c represents the vertex curvature, which is the reciprocal of the radius of curvature R at the vertex (c = 1 / R); h represents the distance between the point on the aspherical surface and the optical axis; k represents the conic coefficient; and Ai represents the i-th order aspherical coefficient.

[0150] The aspherical coefficients are as follows:

[0151]

[0152]

[0153] The characteristic parameter values ​​of the miniaturized 3P large-aperture infrared lens in this embodiment are shown in the table below:

[0154] f3＝ 0.445 f＝ 0.289 f3 / f = 1.5382 R(L3S2)= -0.342 f＝ 0.289 R(L3S2) / f= -1.1823 f2＝ 2.429 f＝ 0.289 f2 / f = 8.3952 f23＝ 0.436 f＝ 0.289 f23 / f= 1.5075 T(L3)= 0.244 TTL = 1.792 T(L3) / TTL= 0.1363

[0155] All of the above feature parameters fall within the following parameter range:

[0156] 1.498 <f3 / f<2.407;

[0157] 1.267 <R(L3S2) / f<3.767;

[0158] 2.837 <f2 / f<10.234;

[0159] 1.444 <f23 / f<1.508;

[0160] 0.078≤T(L3) / TTL≤0.137.

[0161] Structural description: The L1S1 surface and the L1S2 surface form the L1 lens, the L2S1 surface and the L2S2 surface form the L2 lens, and the L3S1 surface and the L3S2 surface form the L3 lens.

[0162] Figure 12 The image shows the MTF performance of the 3P ultra-thin under-display fingerprint lens in Example 3 at a specified frequency. The X and Y axes represent the following: the horizontal axis represents different density levels (0-66 lp / mm); the vertical axis represents lens performance from 0 to 1.0. A higher MTF curve indicates a higher lens MTF score and better performance. A higher density MTF curve score indicates a stronger ability to observe small objects.

[0163] The meanings of solid and dashed lines: Solid lines represent the MTF curve generated parallel to the diameter direction, called the sagittal curve; dashed lines represent the MTF curve generated perpendicular to the diameter direction, called the meridional curve. The closer the solid and dashed lines are, the closer the MTF performance of the lens is in the meridional and sagittal directions, and the better the lens performance.

[0164] Different solid / dashed line groups represent different field of view heights. A field of view height of 0 indicates the center of the lens. The larger the field of view height, the farther away from the center. The MTF performance of each line is closer, indicating good consistency between the center and the edge of the lens.

[0165] Figure 13 The image shows the MTF defocus curve of the 3P ultra-thin under-display fingerprint lens in Example 3, which is a schematic diagram of the FFT modulation transfer function data of the defocus change at a specified frequency. It can be seen that the more concentrated the curve is and the higher the peak value is, the better the corresponding lens imaging effect.

[0166] Figure 14 This is a schematic diagram of light distortion and field curvature at any pupil of the 3P ultra-thin under-display fingerprint lens in Example 3. Wave represents the distortion and field curvature of light at any pupil in any field of view at any wavelength. The field curvature diagram on the left shows the curve of the distance from the image plane to the paraxial image plane as a function of the field of view coordinates. The distortion diagram on the right shows the difference between the real image height and the ideal image height in each field of view. The closer to the center, the better the imaging effect.

[0167] Figure 15 This is a relative illumination diagram of the 3P ultra-thin under-display fingerprint lens in Example 3. The higher the value, the better the relative illumination.

[0168] Example 4

[0169] This embodiment provides a structure for a 3P ultra-thin under-display fingerprint lens, as shown below. Figure 16 As shown in the table below, the lens data of the 3P ultra-thin under-display fingerprint lens in this embodiment are as follows:

[0170]

[0171]

[0172] The formula for aspherical surfaces is as follows:

[0173]

[0174] Where z represents the point on the aspherical surface at a distance h from the optical axis, and its relative distance to the tangent plane at the vertex on the optical axis of the aspherical surface; c represents the vertex curvature, which is the reciprocal of the radius of curvature R at the vertex (c = 1 / R); h represents the distance between the point on the aspherical surface and the optical axis; k represents the conic coefficient; and Ai represents the i-th order aspherical coefficient.

[0175] The aspherical coefficients are as follows:

[0176]

[0177]

[0178] The characteristic parameter values ​​of the miniaturized 3P large-aperture infrared lens in this embodiment are shown in the table below:

[0179] f3＝ 0.469 f＝ 0.292 f3 / f = 1.6050 R(L3S2)= -0.326 f＝ 0.292 R(L3S2) / f= -1.1145 f2＝ 1.814 f＝ 0.292 f2 / f = 6.2081 f23＝ 0.431 f＝ 0.292 f23 / f= 1.4745 T(L3)= 0.236 TTL = 1.797 T(L3) / TTL= 0.1315

[0180] All of the above feature parameters fall within the following parameter range:

[0181] 1.498 <f3 / f<2.407;

[0182] 1.267 <R(L3S2) / f<3.767;

[0183] 2.837 <f2 / f<10.234;

[0184] 1.444 <f23 / f<1.508;

[0185] 0.078≤T(L3) / TTL≤0.137.

[0186] Structural description: The L1S1 surface and the L1S2 surface form the L1 lens, the L2S1 surface and the L2S2 surface form the L2 lens, and the L3S1 surface and the L3S2 surface form the L3 lens.

[0187] Figure 17The image shows the MTF performance of the 3P ultra-thin under-display fingerprint lens in Example 4 at a specified frequency. The X and Y axes represent the following: the horizontal axis (0-66 lp / mm) represents different density levels; the vertical axis (0-1.0) represents lens performance. A higher MTF curve indicates a higher lens MTF score and better performance. Higher density MTF curves result in a higher score and a stronger ability to observe small objects.

[0188] The meanings of solid and dashed lines: Solid lines represent the MTF curve generated parallel to the diameter direction, called the sagittal curve; dashed lines represent the MTF curve generated perpendicular to the diameter direction, called the meridional curve. The closer the solid and dashed lines are, the closer the MTF performance of the lens is in the meridional and sagittal directions, and the better the lens performance.

[0189] Different solid / dashed line groups represent different field of view heights. A field of view height of 0 indicates the center of the lens. The larger the field of view height, the farther away from the center. The MTF performance of each line is closer, indicating good consistency between the center and the edge of the lens.

[0190] Figure 18 The image shows the MTF defocus curve of the 3P ultra-thin under-display fingerprint lens in Example 4, which is a schematic diagram of the FFT modulation transfer function data of the defocus change at a specified frequency. It can be seen that the more concentrated the curve is and the higher the peak value is, the better the corresponding lens imaging effect.

[0191] Figure 19 This is a schematic diagram of light distortion and field curvature at any pupil of the 3P ultra-thin under-display fingerprint lens in Example 4. Wave represents the distortion and field curvature of light at any pupil in any field of view. The field curvature diagram on the left shows the curve of the distance from the image plane to the paraxial image plane as a function of the field of view coordinates. The distortion diagram on the right shows the difference between the real image height and the ideal image height in each field of view. The closer to the center, the better the imaging effect.

[0192] Figure 20 This is a relative illumination diagram of the 3P ultra-thin under-display fingerprint lens in Example 4. The higher the value, the better the relative illumination.

[0193] Example 5

[0194] This embodiment provides a structure for a 3P ultra-thin under-display fingerprint lens, as shown below. Figure 21 As shown in the table below, the lens data of the 3P ultra-thin under-display fingerprint lens in this embodiment are as follows:

[0195]

[0196]

[0197] The formula for aspherical surfaces is as follows:

[0198]

[0199] Where z represents the point on the aspherical surface at a distance h from the optical axis, and its relative distance to the tangent plane at the vertex on the optical axis of the aspherical surface; c represents the vertex curvature, which is the reciprocal of the radius of curvature R at the vertex (c = 1 / R); h represents the distance between the point on the aspherical surface and the optical axis; k represents the conic coefficient; and Ai represents the i-th order aspherical coefficient.

[0200] The aspherical coefficients are as follows:

[0201]

[0202]

[0203] The characteristic parameter values ​​of the miniaturized 3P large-aperture infrared lens in this embodiment are shown in the table below:

[0204] f3＝ 0.603 f＝ 0.290 f3 / f = 2.0787 R(L3S2)= -0.741 f＝ 0.290 R(L3S2) / f= -2.5567 f2＝ 1.074 f＝ 0.290 f2 / f = 3.7035 f23＝ 0.419 f＝ 0.290 f23 / f= 1.4448 T(L3)= 0.157 TTL = 1.783 T(L3) / TTL= 0.0881

[0205] All of the above feature parameters fall within the following parameter range:

[0206] 1.498 <f3 / f<2.407;

[0207] 1.267 <R(L3S2) / f<3.767;

[0208] 2.837 <f2 / f<10.234;

[0209] 1.444 <f23 / f<1.508;

[0210] 0.078≤T(L3) / TTL≤0.137.

[0211] Structural description: The L1S1 surface and the L1S2 surface form the L1 lens, the L2S1 surface and the L2S2 surface form the L2 lens, and the L3S1 surface and the L3S2 surface form the L3 lens.

[0212] Figure 22 The image shows the MTF performance of the 3P ultra-thin under-display fingerprint lens in Example 5 at a specified frequency. The X and Y axes represent the following: the horizontal axis represents different density levels (0-66 lp / mm); the vertical axis represents lens performance from 0 to 1.0. A higher MTF curve indicates a higher lens MTF score and better performance. A higher density MTF curve score indicates a stronger ability to observe small objects.

[0213] The meanings of solid and dashed lines: Solid lines represent the MTF curve generated parallel to the diameter direction, called the sagittal curve; dashed lines represent the MTF curve generated perpendicular to the diameter direction, called the meridional curve. The closer the solid and dashed lines are, the closer the MTF performance of the lens is in the meridional and sagittal directions, and the better the lens performance.

[0214] Different solid / dashed line groups represent different field of view heights. A field of view height of 0 indicates the center of the lens. The larger the field of view height, the farther away from the center. The MTF performance of each line is closer, indicating good consistency between the center and the edge of the lens.

[0215] Figure 23 The image shows the MTF defocus curve of the 3P ultra-thin under-display fingerprint lens in Example 5, which is a schematic diagram of the FFT modulation transfer function data of the defocus change at a specified frequency. It can be seen that the more concentrated the curve is and the higher the peak value is, the better the corresponding lens imaging effect.

[0216] Figure 24 This is a schematic diagram of light distortion and field curvature at any pupil of the 3P ultra-thin under-display fingerprint lens in Example 5. Wave represents the distortion and field curvature of light at any pupil within an arbitrary field of view. The field curvature diagram on the left shows the curve of the distance from the image plane to the paraxial image plane as a function of the field of view coordinates; the distortion diagram on the right shows the difference between the true image height and the ideal image height for each field of view. The closer to the center, the better the imaging effect.

[0217] Figure 25 This is a relative illumination diagram of the 3P ultra-thin under-display fingerprint lens in Example 5. The higher the value, the better the relative illumination.

[0218] Example 6

[0219] This embodiment provides a structure for a 3P ultra-thin under-display fingerprint lens, as shown below. Figure 26 As shown in the table below, the lens data of the 3P ultra-thin under-display fingerprint lens in this embodiment are as follows:

[0220]

[0221]

[0222] The formula for aspherical surfaces is as follows:

[0223]

[0224] Where z represents the point on the aspherical surface at a distance h from the optical axis, and its relative distance to the tangent plane at the vertex on the optical axis of the aspherical surface; c represents the vertex curvature, which is the reciprocal of the radius of curvature R at the vertex (c = 1 / R); h represents the distance between the point on the aspherical surface and the optical axis; k represents the conic coefficient; and Ai represents the i-th order aspherical coefficient.

[0225] The aspherical coefficients are as follows:

[0226]

[0227]

[0228] The characteristic parameter values ​​of the miniaturized 3P large-aperture infrared lens in this embodiment are shown in the table below:

[0229] f3＝ 0.631 f＝ 0.290 f3 / f = 2.1711 R(L3S2)= -0.878 f＝ 0.290 R(L3S2) / f= -3.0237 f2＝ 1.023 f＝ 0.290 f2 / f = 3.5228 f23＝ 0.420 f＝ 0.290 f23 / f= 1.4453 T(L3)= 0.139 TTL = 1.784 T(L3) / TTL= 0.0780

[0230] All of the above feature parameters fall within the following parameter range:

[0231] 1.498 <f3 / f<2.407;

[0232] 1.267 <R(L3S2) / f<3.767;

[0233] 2.837 <f2 / f<10.234;

[0234] 1.444 <f23 / f<1.508;

[0235] 0.078≤T(L3) / TTL≤0.137.

[0236] Structural description: The L1S1 surface and the L1S2 surface form the L1 lens, the L2S1 surface and the L2S2 surface form the L2 lens, and the L3S1 surface and the L3S2 surface form the L3 lens.

[0237] Figure 27 The image shows the MTF performance of the 3P ultra-thin under-display fingerprint lens in Example 6 at a specified frequency. The X and Y axes represent the following: the horizontal axis (0-66 lp / mm) represents different density levels; the vertical axis (0-1.0) represents lens performance. A higher MTF curve indicates a higher lens MTF score and better performance. A higher density MTF curve score indicates a stronger ability to observe small objects.

[0238] The meanings of solid and dashed lines: Solid lines represent the MTF curve generated parallel to the diameter direction, called the sagittal curve; dashed lines represent the MTF curve generated perpendicular to the diameter direction, called the meridional curve. The closer the solid and dashed lines are, the closer the MTF performance of the lens is in the meridional and sagittal directions, and the better the lens performance.

[0239] Different solid / dashed line groups represent different field of view heights. A field of view height of 0 indicates the center of the lens. The larger the field of view height, the farther away from the center. The MTF performance of each line is closer, indicating good consistency between the center and the edge of the lens.

[0240] Figure 28The image shows the MTF defocus curve of the 3P ultra-thin under-display fingerprint lens in Example 6, which is a schematic diagram of the FFT modulation transfer function data of the defocus change at a specified frequency. It can be seen that the more concentrated the curve is and the higher the peak value is, the better the corresponding lens imaging effect.

[0241] Figure 29 This is a schematic diagram of light distortion and field curvature at any pupil of the 3P ultra-thin under-display fingerprint lens in Example 6. Wave represents the distortion and field curvature of light at any pupil within an arbitrary field of view. The field curvature diagram on the left shows the curve of the distance from the image plane to the paraxial image plane as a function of the field of view coordinates; the distortion diagram on the right shows the difference between the true image height and the ideal image height for each field of view. The closer to the center, the better the imaging effect.

[0242] Figure 30 This is a relative illumination diagram of the 3P ultra-thin under-display fingerprint lens in Example 6. The higher the value, the better the relative illumination.

[0243] Example 7

[0244] This embodiment provides a structure for a 3P ultra-thin under-display fingerprint lens, as shown below. Figure 31 As shown in the table below, the lens data of the 3P ultra-thin under-display fingerprint lens in this embodiment are as follows:

[0245]

[0246]

[0247] The formula for aspherical surfaces is as follows:

[0248]

[0249] Where z represents the point on the aspherical surface at a distance h from the optical axis, and its relative distance to the tangent plane at the vertex on the optical axis of the aspherical surface; c represents the vertex curvature, which is the reciprocal of the radius of curvature R at the vertex (c = 1 / R); h represents the distance between the point on the aspherical surface and the optical axis; k represents the conic coefficient; and Ai represents the i-th order aspherical coefficient.

[0250] The aspherical coefficients are as follows:

[0251]

[0252]

[0253] The characteristic parameter values ​​of the miniaturized 3P large-aperture infrared lens in this embodiment are shown in the table below:

[0254] f3＝ 0.698 f＝ 0.290 f3 / f = 2.4062 R(L3S2)= -1.439 f＝ 0.290 R(L3S2) / f= -4.9649 f2＝ 0.823 f＝ 0.290 f2 / f = 2.8374 f23＝ 0.436 f＝ 0.290 f23 / f= 1.5022 T(L3)= 0.163 TTL = 1.942 T(L3) / TTL= 0.0840

[0255] All of the above feature parameters fall within the following parameter range:

[0256] 1.498 <f3 / f<2.407;

[0257] 1.267 <R(L3S2) / f<3.767;

[0258] 2.837 <f2 / f<10.234;

[0259] 1.444 <f23 / f<1.508;

[0260] 0.078≤T(L3) / TTL≤0.137.

[0261] Structural description: The L1S1 surface and the L1S2 surface form the L1 lens, the L2S1 surface and the L2S2 surface form the L2 lens, and the L3S1 surface and the L3S2 surface form the L3 lens.

[0262] Figure 32 The image shows the MTF performance of the 3P ultra-thin under-display fingerprint lens in Example 7 at a specified frequency. The X and Y axes represent the following: the horizontal axis represents different density levels (0-66 lp / mm); the vertical axis represents lens performance from 0 to 1.0. A higher MTF curve indicates a higher lens MTF score and better performance. A higher density MTF curve score indicates a stronger ability to observe small objects.

[0263] The meanings of solid and dashed lines: Solid lines represent the MTF curve generated parallel to the diameter direction, called the sagittal curve; dashed lines represent the MTF curve generated perpendicular to the diameter direction, called the meridional curve. The closer the solid and dashed lines are, the closer the MTF performance of the lens is in the meridional and sagittal directions, and the better the lens performance.

[0264] Different solid / dashed line groups represent different field of view heights. A field of view height of 0 indicates the center of the lens. The larger the field of view height, the farther away from the center. The MTF performance of each line is closer, indicating good consistency between the center and the edge of the lens.

[0265] Figure 33 The image shows the MTF defocus curve of the 3P ultra-thin under-display fingerprint lens in Example 7, which is a schematic diagram of the FFT modulation transfer function data of the defocus change at a specified frequency. It can be seen that the more concentrated the curve is and the higher the peak value is, the better the corresponding lens imaging effect.

[0266] Figure 34 This is a schematic diagram of light distortion and field curvature at any pupil of the 3P ultra-thin under-display fingerprint lens in Example 7. Wave represents the distortion and field curvature of light at any pupil in any field of view at any wavelength. The field curvature diagram on the left shows the curve of the distance from the image plane to the paraxial image plane as a function of the field of view coordinates. The distortion diagram on the right shows the difference between the real image height and the ideal image height in each field of view. The closer to the center, the better the imaging effect.

[0267] Figure 35 This is a relative illumination diagram of the 3P ultra-thin under-display fingerprint lens in Example 7. The higher the value, the better the relative illumination.

[0268] Comparative Example

[0269] The proportional representation provides the lens structure as follows: Figure 36 As shown in the comparison example, the lens data of the 3P ultra-thin under-display fingerprint camera are shown in the table below:

[0270]

[0271]

[0272] The formula for aspherical surfaces is as follows:

[0273]

[0274] Where z represents the point on the aspherical surface at a distance h from the optical axis, and its relative distance to the tangent plane at the vertex on the optical axis of the aspherical surface; R represents the radius of curvature; h represents the distance between the point on the aspherical surface and the optical axis; k represents the conic coefficient; and Ai represents the i-th order aspherical coefficient.

[0275] The aspherical coefficients are as follows:

[0276] Surface serial number 1 2 3 4 5 6 Surface name L1s1 L1s2 L2s1 L2s2 L3s1 L3s2 C -7.898E-01 1.335E+00 1.624E+00 -5.886E-01 6.479E-01 -5.967E+00 K -3.724E+01 1.038E+01 1.166E+01 -2.313E-01 -9.598E+00 8.720E+01 A4 1.288E+00 8.145E+00 -3.991E-01 -4.872E+00 1.522E-01 3.961E-01 A6 -1.936E+00 -4.771E+01 -8.588E+01 8.650E+01 6.520E+00 -7.716E-02 A8 3.263E+00 1.362E+03 2.376E+03 -1.040E+03 -5.192E+01 3.570E+00 A10 -8.527E+00 -3.208E+04 -4.136E+04 7.268E+03 1.967E+02 -1.253E+01 A12 2.284E+01 4.230E+05 3.347E+05 -3.016E+04 -4.270E+02 -3.175E+01 A14 -3.198E+01 -2.756E+06 -7.799E+05 7.194E+04 1.668E+02 -1.202E+01 A16 1.703E+01 6.859E+06 -2.523E+06 -7.702E+04 -1.167E+01 1.932E+02 A18 3.767E+00 1.142E+07 9.932E+06 -4.772E+04 3.555E+03 5.182E+02 A20 -4.699E+00 -7.567E+07 3.051E+06 1.634E+05 -5.542E+03 -9.086E+02 A22 -7.898E-01 1.335E+00 1.624E+00 -5.886E-01 6.479E-01 -5.967E+00 A24 -3.724E+01 1.038E+01 1.166E+01 -2.313E-01 -9.598E+00 8.720E+01 A26 1.288E+00 8.145E+00 -3.991E-01 -4.872E+00 1.522E-01 3.961E-01 A28 -1.936E+00 -4.771E+01 -8.588E+01 8.650E+01 6.520E+00 -7.716E-02 A30 3.263E+00 1.362E+03 2.376E+03 -1.040E+03 -5.192E+01 3.570E+00

[0277] The characteristic parameter values ​​of the miniaturized 3P large-aperture infrared lens in this embodiment are shown in the table below:

[0278]

[0279]

[0280] The above feature parameters Not satisfied Within the following parameter range:

[0281] 1.498 <f3 / f<2.407;

[0282] 1.267 <R(L3S2) / f<3.767;

[0283] 2.837 <f2 / f<10.234;

[0284] 1.444 <f23 / f<1.508;

[0285] 0.078≤T(L3) / TTL≤0.137.

[0286] Structural description: The L1S1 surface and the L1S2 surface form the L1 lens, the L2S1 surface and the L2S2 surface form the L2 lens, and the L3S1 surface and the L3S2 surface form the L3 lens.

[0287] Figure 37 This is a comparative example of the MTF performance of a 3P ultra-thin under-display fingerprint lens at a specified frequency. The X and Y axes represent the following: the horizontal axis (0-66 lp / mm) represents different density levels; the vertical axis (0-1.0) represents lens performance. A higher MTF curve indicates a higher lens MTF score and better performance. Higher density MTF curves result in a higher score and a stronger ability to observe small objects. In this comparative example, the MTF curve density is lower than in the previous embodiment, indicating inferior performance.

[0288] Figure 38 This is the MTF defocus curve of the 3P ultra-thin under-display fingerprint lens in the comparative example, which is a schematic diagram of the FFT modulation transfer function data of the defocus change at a specified frequency. Theoretically, the more concentrated the curve is and the higher the peak value is, the better the corresponding lens imaging effect. Compared with the above embodiment, the curve concentration in this comparative example is poor and the performance is not as good as the above embodiment.

[0289] Figure 39 This is a schematic diagram illustrating the distortion and field curvature of light at any pupil of a 3P ultra-thin under-display fingerprint lens in this comparative example. Wave represents the distortion and field curvature of light at any pupil within an arbitrary field of view. The left field curvature diagram shows the curve of the distance from the image plane to the paraxial image plane as a function of the field of view coordinates; the right distortion diagram shows the difference between the true image height and the ideal image height for each field of view. Theoretically, the closer to the center, the better the imaging effect. Comparing this to the above embodiments, it can be seen that the curve in this comparative example is not as close to the center as in the above embodiments, and the corresponding imaging effect is not as good as in the above embodiments.

[0290] Figure 40 This is a relative illumination diagram of the 3P ultra-thin under-display fingerprint lens for comparison. Theoretically, the higher the value, the better the relative illumination. Comparing it with the above embodiments, it can be seen that the value of this comparison is not much different from the value of the above embodiments, and the performance is not much different.

[0291] In summary, the 3P ultra-thin under-display fingerprint lens three-piece design provided by this invention supplements the types of 3P ultra-thin under-display fingerprint lenses on the market. One of the main invention objectives of the 3P ultra-thin under-display fingerprint lens is to achieve ultra-thinness. By rationally designing the lens structure and materials, and optimizing the optical system, the total length of the lens (conventional TTL>2.1) is significantly reduced, thereby meeting the stringent space requirements of modern electronic products. Furthermore, by using aspherical plastic lenses and optimized lens combinations, aberrations and distortions can be effectively reduced, improving image clarity and accuracy. Moreover, the cost is lower, while other performance characteristics remain unchanged or are even improved.

[0292] In summary, this 3P ultra-thin under-display fingerprint lens achieves smaller distortion, shorter overall length, reduced material and assembly costs, and improved production efficiency. Combined with a new design architecture and a brand-new film system, it is compact and has excellent mass production capabilities.

[0293] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0294] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A 3P ultra-thin under-display fingerprint lens, characterized in that, It includes a first lens, an aperture stop, a second lens, and a third lens arranged sequentially from the object side along the optical axis to the image side; The first lens is a negative lens with a concave surface near the optical axis on the object side and a convex surface near the optical axis on the image side; The second lens is a positive lens whose object-side surface is convex near the optical axis; The third lens is a positive lens with a convex surface near the optical axis on both the object-side and image-side surfaces.

2. The 3P ultra-thin under-display fingerprint lens according to claim 1, characterized in that, The third lens has a focal length of f3, and the lens focal length is f, satisfying the following conditions: 1.498 <f3 / f<2.407。 3. The 3P ultra-thin under-display fingerprint lens according to claim 1, characterized in that, The third lens has an image-side radius of curvature of R(L3S2) and a focal length of f, satisfying the following conditions: 1.267 <R(L3S2) / f<3.767。 4. The 3P ultra-thin under-display fingerprint lens according to claim 1, characterized in that, The second lens has a focal length of f2, and the lens focal length is f, satisfying the following condition: 2.837 <f2 / f<10.234。 5. The 3P ultra-thin under-display fingerprint lens according to claim 1, characterized in that, The combined focal length of the second lens and the third lens is f23, and the focal length of the lens is f, satisfying the following condition: 1.444 <f23 / f<1.508。 6. The 3P ultra-thin under-display fingerprint lens according to claim 1, characterized in that, The total optical length TTL of the lens optical system of the 3P ultra-thin under-display fingerprint lens, and the core thickness T(L3) of the third lens, satisfy the following conditions: 0.078≤T(L3) / TTL≤0.137.

Images