A conoscope for display brightness viewing angle distribution measurement

Abstract

The application discloses a conic lens for display bright chroma view angle distribution measurement, comprising a front light diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens arranged in sequence from an object side to an image side, wherein the first lens, the second lens, the fourth lens, the fifth lens, the seventh lens, the ninth lens and the tenth lens each have positive focal power, and the third lens, the sixth lens and the eighth lens each have negative focal power. The lens of the application adopts seven pieces of high refractive index glass and three pieces of high relative dispersion coefficient glass, has a small number of lenses, reduces assembly difficulty, has a high process yield, uniformly images an image plane, has a linear F-Theta distortion of less than 1.2%, an imaging area of up to 21.21mm*21.21mm, a field of view angle of up to 160 degrees, a reasonable focal power distribution of the lenses, and ensures the accuracy of the view angle and the measurement accuracy of the bright chroma.

Description

Technical Field

[0001] This invention belongs to the field of display technology, and specifically relates to a conical lens for measuring the luminance and chromaticity viewing angle distribution of a display. Background Technology

[0002] The luminance, chromaticity, and viewing angle distribution characteristics of a monitor are important performance indicators and need to be tested during the research and development and production stages to ensure product quality. Traditional luminance, chromaticity, and viewing angle distribution testing uses a five-axis instrument with a point-and-shoot spectrometer. The spectrometer is electrically controlled to rotate the instrument and aim at the monitor at different angles to measure luminance and chromaticity data. However, because it uses a mechanical rotation structure, the measurement time is long when a large amount of viewing angle data needs to be acquired, resulting in low testing efficiency. Summary of the Invention

[0003] To address the technical problems existing in the prior art, the present invention aims to provide a conical lens for measuring the luminance and chromaticity viewing angle distribution of a display.

[0004] To achieve the above objectives and technical effects, the technical solution adopted by this invention is as follows:

[0005] A conical lens for measuring the luminance and chromaticity angular distribution of a display includes a front aperture, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged sequentially from the object side to the image side. The first to fourth lenses form a front lens group, and the fifth to tenth lenses form a rear lens group. The first, second, fourth, fifth, seventh, ninth, and tenth lenses each have positive optical power, and the third, sixth, and eighth lenses each have negative optical power.

[0006] Furthermore, the ratio of the focal length f14 of the front lens group to the focal length f510 of the rear lens group is 0.15 < f14 / f510 < 0.25.

[0007] Furthermore, the maximum effective imaging area of ​​the conical lens is 21.21mm × 21.21mm, and the maximum diagonal image height coverage is 21.2mm.

[0008] Furthermore, the ratio of the total length TTL from the front aperture to the imaging plane to the diagonal image height ImageH of the effective imaging area satisfies: 0.06 < ImageH / TTL < 0.07.

[0009] Furthermore, the first, second, and fourth lenses are all made of H-ZLAF series high-refractive-index glass, which can correct the incident angle of light from 80° to 0°. The third lens is made of high relative dispersion glass to compensate for short-wavelength chromatic aberration of the lens.

[0010] Furthermore, the fifth, seventh, ninth, and tenth lenses are made of high-refractive-index glass from the H-ZLAF or H-ZF series, while the sixth and eighth lenses are made of glass with high relative dispersion.

[0011] Furthermore, the apertures of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, ninth lens, and tenth lens are all less than 60mm.

[0012] Furthermore, the parameters of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, ninth lens, and tenth lens are shown in the table below:

[0013]

[0014] Furthermore, the maximum aperture of the front aperture is 5mm.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1) This invention discloses a conical lens for measuring the luminance and chromaticity viewing angle distribution of a display. It only requires seven pieces of high refractive index glass and three pieces of high relative dispersion coefficient glass, which greatly reduces the number of lenses, reduces assembly difficulty, improves process yield, and reduces costs.

[0017] 2) This invention discloses a conical lens for measuring the luminance and chromaticity viewing angle distribution of a display. The lens features uniform image plane imaging and linear F-Theta distortion of less than 1.2%, ensuring the accuracy of luminance and chromaticity measurements. The imaging area reaches 21.21mm × 21.21mm, compatible with common APS-C and full-frame CMOS sensors. It projects light emitted from a 5mm diameter spot on the display surface onto the CMOS sensor, enabling luminance and chromaticity measurements within an azimuth angle of 0-360 degrees and a tilt angle of 0-80 degrees. The sensor acquires luminance and chromaticity data from all viewing angles simultaneously, significantly reducing testing time and improving efficiency. The field of view reaches 160°, offering a large and stable performance, meeting the requirements for luminance and chromaticity testing under ultra-wide viewing angles. The reasonable allocation of optical power among the lenses solves the problem of linear illuminance distribution under ultra-wide viewing angles and high-frame sizes, ensuring the accuracy of both viewing angle and luminance and chromaticity measurements. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a diagram of the optical modulation transfer function of the present invention;

[0020] Figure 3 This is a diagram showing the field curvature and linear distortion of the present invention;

[0021] Figure 4 This is the axial aberration diagram of the present invention. Detailed Implementation

[0022] The present invention will now be described in detail so that its advantages and features can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0023] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.

[0024] like Figure 1-4 As shown, a conical lens for measuring the luminance and chromaticity viewing angle distribution of a display is suitable for luminance and chromaticity viewing angle analysis of a display. From the object side to the image side, it is provided with the following components:

[0025] The front aperture has a maximum diameter of 5mm;

[0026] The first lens G1 has positive optical power, a refractive index of Nd1 = 1.90, an Abbe number of Vd1 = 31.3, a concave surface facing the object side, and a convex surface facing the image side.

[0027] The second lens G2 has positive optical power, a refractive index of Nd1 = 1.88, an Abbe number of Vd1 = 40.8, and a convex surface on the image side.

[0028] The third lens G3 has negative optical power, a refractive index of Nd1 = 1.44, an Abbe number of Vd1 = 95.1, a convex surface facing the object side, and a concave surface facing the image side.

[0029] The fourth lens G4 has positive optical power, a refractive index of Nd1 = 1.85, an Abbe number of Vd1 = 32.3, and a convex surface facing the object side.

[0030] The fifth lens G5 has positive optical power, a refractive index of Nd1 = 2.00, an Abbe number of Vd1 = 25.4, and a convex surface facing the object side.

[0031] The sixth lens G6 has negative optical power, a refractive index of Nd1 = 1.92, an Abbe number of Vd1 = 20.9, and a concave surface facing the object side.

[0032] The seventh lens G7 has positive optical power, a refractive index of Nd1 = 1.88, an Abbe number of Vd1 = 40.8, and a convex surface on the image side.

[0033] The eighth lens G8 has a negative optical power, a refractive index of Nd1 = 1.92, an Abbe number of Vd1 = 20.9, and a concave surface facing the image side.

[0034] The ninth lens G9 has positive optical power, a refractive index of Nd1 = 1.44, an Abbe number of Vd1 = 95.1, and is a biconvex lens;

[0035] The tenth lens G10 has positive optical power, a refractive index of Nd1 = 1.88, an Abbe number of Vd1 = 40.8, and a convex surface facing the object side.

[0036] Among them, the third lens G3 and the fourth lens G4 form the first cemented lens CG1, and the eighth lens G8 and the ninth lens G9 form the second cemented lens CG2.

[0037] The first to fourth lenses form the front lens group. The first, second, and fourth lenses are all made of H-ZLAF series high-refractive-index glass, possessing strong positive optical power, capable of correcting the incident angle of light from 80° to 0°. The third lens uses high relative dispersion glass to compensate for short-wavelength chromatic aberration in the lens. The overall optical power of the front lens group is positive, which can lower the light beam height, reduce the lens aperture, and change the projection direction of light, thereby reducing the field of view of the rear lens group.

[0038] The fifth to tenth lenses form the rear lens group, with the sixth and eighth lenses being negative lenses and the others being positive lenses. This design allows light to propagate in a "high-low-high" pattern, which helps correct field curvature, improves system reliability, and reduces tolerance sensitivity. The fifth, seventh, ninth, and tenth lenses use high-refractive-index glass from the H-ZLAF or H-ZF series, while the sixth and eighth lenses use high relative dispersion glass. The overall optical power of the rear lens group is positive, allowing it to form an inverted final image of the light rays compressed and refracted by the front lens group. This imaging method minimizes the lens aperture of the ultra-wide-angle lens.

[0039] The ratio of the focal length of the front lens group (f14) to the focal length of the rear lens group (f510) is 0.15 < f14 / f510 < 0.25.

[0040] In the conical lens provided by this invention, the aperture of all lenses is less than 60mm; the maximum coverage area of ​​the effective imaging region ImageC on the imaging surface is 21.21mm×21.21mm, and the maximum diagonal image height ImageH covers 21.2mm; the ratio of the total length TTL from the front aperture to the imaging surface to the diagonal image height ImageH of the effective imaging region satisfies: 0.06<ImageH / TTL<0.07.

[0041] Example 1

[0042] like Figure 1-4 As shown, a conical lens for measuring the luminance and chromaticity viewing angle distribution of a display is suitable for luminance and chromaticity viewing angle analysis of a display. From the object side to the image side, it is provided with the following components:

[0043] Front aperture, 5mm in diameter;

[0044] The first lens G1 has positive optical power, a refractive index of Nd1 = 1.90, an Abbe number of Vd1 = 31.3, a concave surface facing the object side, and a convex surface facing the image side.

[0045] The second lens G2 has positive optical power, a refractive index of Nd1 = 1.88, an Abbe number of Vd1 = 40.8, and a convex surface on the image side.

[0046] The third lens G3 has negative optical power, a refractive index of Nd1 = 1.44, an Abbe number of Vd1 = 95.1, a convex surface facing the object side, and a concave surface facing the image side.

[0047] The fourth lens G4 has positive optical power, a refractive index of Nd1 = 1.85, an Abbe number of Vd1 = 32.3, and a convex surface facing the object side.

[0048] The fifth lens G5 has positive optical power, a refractive index of Nd1 = 2.00, an Abbe number of Vd1 = 25.4, and a convex surface facing the object side.

[0049] The sixth lens G6 has negative optical power, a refractive index of Nd1 = 1.92, an Abbe number of Vd1 = 20.9, and a concave surface facing the object side.

[0050] The seventh lens G7 has positive optical power, a refractive index of Nd1 = 1.88, an Abbe number of Vd1 = 40.8, and a convex surface on the image side.

[0051] The eighth lens G8 has a negative optical power, a refractive index of Nd1 = 1.92, an Abbe number of Vd1 = 20.9, and a concave surface facing the image side.

[0052] The ninth lens G9 has positive optical power, a refractive index of Nd1 = 1.44, an Abbe number of Vd1 = 95.1, and is a biconvex lens;

[0053] The tenth lens G10 has positive optical power, a refractive index of Nd1 = 1.88, an Abbe number of Vd1 = 40.8, and a convex surface facing the object side.

[0054] Among them, the third lens G3 and the fourth lens G4 form the first cemented lens CG1, and the eighth lens G8 and the ninth lens G9 form the second cemented lens CG2.

[0055] The first to fourth lenses form the front lens group. The first, second, and fourth lenses are all made of H-ZLAF series high-refractive-index glass, possessing strong positive optical power, capable of correcting the incident angle of light from 80° to 0°. The third lens uses high relative dispersion glass to compensate for short-wavelength chromatic aberration in the lens. The overall optical power of the front lens group is positive, which can lower the light beam height, reduce the lens aperture, and change the projection direction of light, thereby reducing the field of view of the rear lens group.

[0056] The fifth to tenth lenses form the rear lens group, with the sixth and eighth lenses being negative lenses and the others being positive lenses. This design allows light to propagate in a "high-low-high" pattern, which helps correct field curvature, improves system reliability, and reduces tolerance sensitivity. The fifth, seventh, ninth, and tenth lenses use high-refractive-index H-ZLAF series glass, while the sixth and eighth lenses use high relative dispersion glass. The overall optical power of the rear lens group is positive, allowing it to form an inverted final image of the light rays compressed and refracted by the front lens group. This imaging method minimizes the lens aperture of the ultra-wide-angle lens.

[0057] The ratio of the focal length of the front lens group (f14) to the focal length of the rear lens group (f510) is 0.15 < f14 / f510 < 0.25.

[0058] In the conical lens provided in this embodiment, the ratio of the total length TTL from the front aperture to the imaging surface to the diagonal image height ImageH of the effective imaging area satisfies: 0.06 < ImageH / TTL < 0.07.

[0059] The parameters of the conical lens provided in this embodiment are shown in Table 1:

[0060] Table 1

[0061] Lens effective focal length Total length Field of view Front aperture Maximum lens diameter Image size -7.65mm 315mm 160° 5mm 60mm 15×15mm

[0062] The parameters of each lens in the conical lens provided in this embodiment are shown in Table 2. In Table 2, the units for radius of curvature and thickness are mm. A positive radius of curvature means that the vertex of the surface is located on the left side of the principal surface of the lens, a negative radius of curvature means that the vertex of the surface is located on the right side of the principal surface of the lens, and an infinite radius of curvature means that the surface is flat. Thickness represents the core thickness of the lens or the axial air gap between lenses. Refractive index and Abbe number represent the refractive index and Abbe number of the material used in the lens.

[0063] Table 2

[0064]

[0065]

[0066] Figure 3 The figure shows the field curvature and linear distortion of this embodiment. As can be seen from the figure, the image plane of the conical lens in this embodiment is uniform, and the linear F-Theta distortion is less than 1.2%, which can ensure the accuracy of brightness and color measurement.

[0067] Figure 4 This is the axial aberration diagram of this embodiment. The vertical axis represents the normalized pupil coordinates, and the horizontal axis represents the aberration in the axial direction, with the unit being millimeters. As can be seen from the diagram, the axial aberration of the conical lens in this embodiment is controlled within a very small range, and the axial chromatic aberration of the lens is well corrected.

[0068] Any parts or structures not specifically described in this invention can be made using existing technologies or products, and will not be elaborated upon here.

[0069] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A conical lens for measuring the luminance and chromaticity viewing angle distribution of a display, characterized in that, It consists of a front aperture, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged sequentially from the object side to the image side. The first to fourth lenses form the front lens group, and the fifth to tenth lenses form the rear lens group. The first, second, fourth, fifth, seventh, ninth, and tenth lenses each have positive optical power, and the third, sixth, and eighth lenses each have negative optical power. The ratio of the focal length f14 of the front lens group to the focal length f510 of the rear lens group is 0.15 < f14 / f510 < 0.

25.

2. The conical lens for measuring the luminance and chromaticity viewing angle distribution of a display according to claim 1, characterized in that, The ratio of the total length TTL from the front aperture to the imaging plane to the diagonal image height ImageH of the effective imaging area satisfies: 0.06 < ImageH / TTL < 0.

07.

3. A conical lens for measuring the luminance and chromaticity viewing angle distribution of a display according to claim 1, characterized in that, The first, second, and fourth lenses are all made of H-ZLAF series high-refractive-index glass, which can correct the incident angle of light from 80° to 0°. The third lens is made of high relative dispersion glass to compensate for short-wavelength chromatic aberration of the lens.

4. A conical lens for measuring the luminance and chromaticity viewing angle distribution of a display according to claim 1, characterized in that, The fifth, seventh, ninth, and tenth lenses are made of high-refractive-index glass from the H-ZLAF or H-ZF series, while the sixth and eighth lenses are made of glass with high relative dispersion.

5. A conical lens for measuring the luminance and chromaticity viewing angle distribution of a display according to claim 1, characterized in that, The apertures of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, ninth lens, and tenth lens are all less than 60mm.

6. A conical lens for measuring the luminance and chromaticity viewing angle distribution of a display according to claim 1, characterized in that, The parameters of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, ninth lens, and tenth lens are shown in the table below: 。 7. A conical lens for measuring the luminance and chromaticity viewing angle distribution of a display according to claim 1, characterized in that, The maximum aperture of the front aperture is 5mm.

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