in the formula, R is a distance vector from a fixed point of the aspheric surface when the aspheric surface is at a position with a height h along the optical axis direction, c is the curvature of the aspheric surface, i.e., c is 1/R (R is a curvature radius), k is a conic coefficient, and Ai is an i-th order coefficient of the aspheric surface.

The imaging principle of the optical display system is as follows:

the light emitted by the display is natural light, the natural light emitted by the display firstly enters a fourth optical lens, forms circularly polarized light after being processed by the fourth optical lens to be transmitted out, then enters a first optical lens, is subjected to aberration correction by the first optical lens to be transmitted out, and enters a second optical lens, the circularly polarized light is changed into first polarized light after passing through a second phase retardation film in the second optical lens, the first polarized light is reflected at a polarization reflection film layer in the second optical lens, then is changed into circularly polarized light after passing through a second phase retardation film in the second optical lens again, and enters the third optical lens, part of the light is reflected in the third optical lens to enter the second optical lens, is changed into second polarized light after passing through the second phase retardation film in the second optical lens, and the second polarized light sequentially passes through a polarization reflection film, an absorption type linear polarization film, a polarization film, And after the second lens and the second antireflection film reach human eyes, a virtual image of a specific imaging position and a specific magnification is formed, part of light rays are transmitted into the fifth optical lens in the third optical lens and are absorbed by the fifth optical lens, and the display light rays are prevented from being leaked.

If the first polarized light is S polarized light, the second polarized light is P polarized light; if the first polarized light is P-polarized light, the second polarized light is S-polarized light.

It should be noted that, by the special arrangement of matching the axial positions between the film layers, the fourth optical lens can also eliminate stray light generated by the ambient light below the second optical lens.

The aberration of the optical display system can be greatly reduced by reasonably setting the surface type parameters of the surface of each optical lens in the optical display system, the resolution of the system is improved, and the image quality is improved. When the surface type parameters are reasonably set, more degrees of freedom can be provided for the optical display system by increasing the number of the field lenses, the more rigorous optical index requirements are met, the virtual image distance can be controlled, and the watching comfort is guaranteed. In the third optical lens, the surface types of the third lens and the compensating lens are reasonably arranged, so that a myopic user can see the digital world and the real world clearly without additional myopic lenses. The adaptation myopia range can be further improved by combining with the fine adjustment of the optical display system, and the myopia user can be ensured to wear the glasses for a long time. For example, for a user with 200 degrees of myopia, the distance which can be seen clearly is 0.25-0.5m, and when the virtual image of the optical display system is set at 0.5m, the user with 200 degrees of myopia can be ensured to see clearly the picture. On this basis, through adding the distance between mechanical or electronic structure adjustment optical display system and other optical structure, also can adjust the virtual image distance, the different myopia crowd of adaptation.

The invention also provides wearable equipment which comprises a wearing part and the optical display system, wherein the optical display system is arranged on the wearing part. The wearing part can be a helmet or an eyeglass frame and the like, so that the wearing part is convenient for people to wear on the head. Of course, the wearable device may further include a control unit, a storage unit, and the like, where the control unit is convenient for controlling the device, and the storage unit is convenient for storing images, videos, and the like.

Specific examples are set forth below for a detailed description of the above-described embodiments.

Example 1

Referring to fig. 1 and 2, an optical display system according to an embodiment of the present invention includes adisplay 10 and an optical lens assembly.

Thedisplay 10 may be an OLED display, and thedisplay 10 may display 2D or 3D images or video.

The optical lens assembly includes a firstoptical lens 30, a secondoptical lens 40, a thirdoptical lens 50, a fourthoptical lens 20, and a fifthoptical lens 60.

The fourthoptical lens 20 is disposed on the light exit path of thedisplay 10.

The fourthoptical lens 20 includes afourth lens 201, a fourthphase retardation film 202, and a fourth linearpolarizing film 203. Both side surfaces of thefourth lens 201 are flat surfaces.

The fourthphase retardation film 202 is disposed on a side of thefourth lens 201 away from thedisplay 10, the fourth linearpolarizing film 203 is disposed on a side of thefourth lens 201 close to thedisplay 10, and a fourth antireflection film (not shown) is disposed on both a side of the fourthphase retardation film 202 away from thefourth lens 201 and a side of the fourth linearpolarizing film 203 away from thefourth lens 201.

The light emitted from thedisplay 10 enters the fourthoptical lens 20 and is processed to form circularly polarized light, and the circularly polarized light is transmitted out.

The firstoptical lens 30 is disposed on a transmission light path of the fourthoptical lens 20.

The firstoptical lens 30 includes a first lens 301, two side surfaces of the first lens 301 are aspheric, the two side surfaces of the first lens 301 are both provided with afirst antireflection film 302, and thefirst antireflection film 302 can improve the transmittance of the firstoptical lens 30.

The firstoptical lens 30 functions to reduce curvature of field, distortion and dispersion. The number of the firstoptical lenses 30 is one.

The secondoptical lens 40 is disposed on the transmission light path of the firstoptical lens 30.

The secondoptical lens 40 includes asecond lens 401, asecond antireflection film 402, an absorptive type linearpolarizing film 403, a polarizingreflective film 404, and a secondphase retardation film 405. Both side surfaces of thesecond lens 401 are flat surfaces.

An absorbing typelinear polarization film 403 is disposed on a side of thesecond lens element 401 close to the firstoptical lens element 30, apolarization reflection film 404 is disposed on a side of the absorbing typelinear polarization film 403 away from thesecond lens element 401, a secondphase retardation film 405 is disposed on a side of thepolarization reflection film 404 away from thesecond lens element 401, and asecond antireflection film 402 is disposed on both a side of the secondphase retardation film 405 away from thepolarization reflection film 404 and a side of thesecond lens element 401 away from the absorbing typelinear polarization film 403.

The thirdoptical lens 50 is disposed on the reflection optical path of the secondoptical lens 40.

The thirdoptical lens 50 includes athird lens 501, two side surfaces of thethird lens 501 are aspheric surfaces, a partial transmissionpartial reflection film 503 is disposed on a side surface of thethird lens 501 close to the secondoptical lens 40, and acompensation mirror 502 and athird antireflection film 504 are sequentially disposed on a side surface of thethird lens 501 away from the secondoptical lens 40.

The fifthoptical lens 60 is disposed on a transmission light path of the thirdoptical lens 50.

The fifthoptical lens 60 includes afifth lens 601, a fifthphase retardation film 603, and a fifth linearpolarizing film 602.

The fifth linearpolarizing film 602 is disposed on the side of thefifth lens 601 close to the thirdoptical lens 50, the fifthphase retardation film 603 is disposed on the side of the fifth linearpolarizing film 602 away from the fifthoptical lens 60, and fifthantireflection films 604 are disposed on both the side of the fifthphase retardation film 603 away from the fifthoptical lens 60 and the side of the fifthoptical lens 60 away from the fifth linearpolarizing film 602.

In this embodiment, the field angle of the optical display system is FOV 42 °, and the focal length of the optical display system is f 23 mm.

In this embodiment, each optical parameter is referred to table one and table two.

Watch 1

Watch two

Table one is the relevant optical structure data of the first embodiment, because the optical path is designed reversely in the optical design software, the surfaces S0 to S25 sequentially represent the surfaces through which the light rays sequentially pass from the virtual image position to the display. Where thickness represents the distance a light ray travels from the surface to the next surface, 0 represents that the two surfaces are in close proximity, and negative values represent that the light ray is reflected at the surface.

Table two shows aspheric data of the relevant optical structure in the first embodiment, where k is the conic coefficient in the above curve equation, and a4 to a20 represent the 4 th to 20 th order aspheric coefficients of each surface.

Fig. 3 is a graph of MTF of fig. 2, which is an abbreviation of Modulation Transfer Function, and is a way to describe the performance of an optical system, which can be evaluated for its ability to restore contrast. The horizontal axis represents spatial frequency, the vertical axis represents contrast, the solid line represents the meridional direction, and the dashed line represents the sagittal direction. As can be seen from the figure, the optical system has better resolving power in different directions of different fields of view.

Example 2

Referring to fig. 4 and 5, a second embodiment of the invention provides an optical display system including adisplay 10 and an optical lens assembly. .

Thedisplay 10 may employ anOLED display 10, and thedisplay 10 may display 2D or 3D images or video.

The fourthoptical lens 20 is disposed on the light exit path of thedisplay 10.

The firstoptical lens 30 functions to reduce curvature of field, distortion and dispersion. In this embodiment, the number of the firstoptical lenses 30 is two, and the two firstoptical lenses 30 are sequentially disposed on the transmission light path of the fourthoptical lens 20.

In this embodiment, the field angle of the optical display system isFOV 50 °, and the focal length of the optical display system is f 18 mm.

The optical parameters in this example refer to table three and table four.

Watch III

Watch four

Table three is the relevant optical structure data of the second embodiment, because the optical path is designed reversely in the optical design software, the surfaces S0 to S28 sequentially represent the surfaces through which the light rays sequentially pass from the virtual image position to the display. Where thickness represents the distance a light ray travels from the surface to the next surface, 0 represents that the two surfaces are in close proximity, and negative values represent that the light ray is reflected at the surface.

Table four shows aspheric data of the relevant optical structures in example two, where k is a conic coefficient in the above curve equation, and a4 to a20 represent aspheric coefficients of 4 th to 20 th orders of the respective surfaces.

Fig. 6 is a graph of MTF of fig. 5, which is an abbreviation of Modulation Transfer Function, and is a way to describe the performance of an optical system, which can be evaluated for its ability to restore contrast. The horizontal axis represents spatial frequency, the vertical axis represents contrast, the solid line represents the meridional direction, and the dashed line represents the sagittal direction. As can be seen from the figure, the optical system has better resolving power in different directions of different fields of view

The present invention is not limited to the above-described alternative embodiments, and various other forms of products can be obtained by anyone in light of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the claims, and which the description is intended to be interpreted accordingly.

Claims

1. An optical display system, characterized by: the display comprises a display and an optical lens assembly, wherein the optical lens assembly comprises a first optical lens, a second optical lens and a third optical lens;

2. The optical display system of claim 1, wherein: the first optical lens comprises a first lens, and first antireflection films are arranged on the surfaces of two sides of the first lens.

3. The optical display system of claim 1, wherein: the third optical lens comprises a third lens, a partial transmission partial reflection film, a compensation mirror and a third antireflection film, wherein the partial transmission partial reflection film is arranged on one side of the third lens close to the second optical lens, the compensation mirror is arranged on one side of the third lens far away from the partial transmission partial reflection film, and the third antireflection film is arranged on one side of the compensation mirror far away from the third lens; or the partial transmission partial reflection film is arranged on one side of the third lens far away from the second optical lens, the compensation mirror is arranged on one side of the partial transmission partial reflection film far away from the third lens, and the third antireflection film is arranged on one side of the compensation mirror far away from the third lens and one side of the third lens close to the second optical lens.

4. The optical display system of claim 1, wherein: the optical lens assembly further comprises a fourth optical lens, wherein the fourth optical lens is arranged on a light path between the display and the first optical lens, or the fourth optical lens is arranged on a light path between the first optical lens and the second optical lens;

5. The optical display system of claim 1, wherein: the optical lens assembly further comprises a fifth optical lens, and the fifth optical lens is arranged on a transmission light path of the third optical lens;

6. The optical display system of any one of claims 1-5, wherein: the optical display system has a field of view FOV, 30 ° < FOV <60 °; the optical display system has a focal length of f, 10mm < f <40 mm.

7. The optical display system of claim 6, wherein: the focal length of the first optical lens is fF, the thickest thickness is MaxT, the thinnest thickness is MinT, and the following conditions are met: fF <100mm, and MaxT/MinT < 10; the third optical lens has a focal length of f5 and a radius of curvature of R5, which satisfies 1< f5/f <2, -70< R5< -40.

8. The optical display system of any one of claims 1-5, wherein: the refractive index of the material for manufacturing each optical lens is N, the dispersion coefficient is V, and the N is more than 1.3 and less than 1.8, and the V is more than 20 and less than 70.

9. The optical display system of any one of claims 1-5, wherein: the optical display system can form a virtual image which can be seen by an observer, the optical display system defines the light path direction of the reflected light of the second optical lens as the positive direction of the Z axis in a right-hand rectangular coordinate system O-xyz, and the range in which the human eyes can move in the X direction or the Y direction relative to the optical display system is EB which meets the condition that 5mm < EB <25 mm; the distance between the human eye and the second optical lens is ER, and the ER/EB is 1< ER/EB < 2; the optical display system forms a virtual image at a distance OB from the human eye, 0.1m < OB <10 m.

10. The optical display system of claim 9, wherein the optical axis of the second optical lens forms an angle α with the Z axis, which satisfies 35 ° < α <55 °, and the optical axis of the third optical lens forms an angle β with the Z axis, which satisfies 70 ° < β <110 °.

11. The optical display system of any one of claims 1-5, wherein: the distance between the center point of the second optical lens and the center point of the third optical lens is T1, which satisfies T1 < 20 mm; the distance between the center point of the second optical lens and the display is T2, which satisfies T2 <25 mm.

12. A wearable device, characterized by: comprising a wearing part and an optical display system according to any one of claims 1-11, said optical display system being arranged on said wearing part.