Display module and head-mounted display device

Abstract

The utility model provides a display module and head-mounted display equipment, and relates to the technical field of display. The display module comprises a display screen, a lens assembly and an eye movement tracking assembly. The lens assembly is located between the display screen and the eyeballs of the user, the display screen emits image light beams to the lens assembly, and the image light beams enter the eyeballs of the user to form images after passing through the lens assembly. An effective light area is formed between the display screen and eyeballs of a user and in an area where image light beams pass through, the eye movement tracking assembly is located outside the effective light area, and the orthographic projection of the eye movement tracking assembly in the optical axis direction is located in the orthographic projection of the lens assembly in the optical axis direction. The eye movement tracking assembly comprises a light source module and an imaging module, and the light source module and the imaging module are arranged on the two opposite sides of the lens assembly in the axial direction respectively. The light source module is used for emitting light to the eyeballs of the user, and the light reflected by the eyeballs of the user enters the imaging module to form images of the eyeballs of the user. The display module is compact in structure, and miniaturization development of the head-mounted display equipment is facilitated.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a display module and a head-mounted display device. Background Technology

[0002] With the development of technologies such as virtual reality (VR), augmented reality (AR), and mixed reality (MR), as well as the emergence of the metaverse concept, head-mounted display (HMD) devices have gradually entered the public eye. In order to enhance the user's immersive experience, it is usually necessary to track the user's head, gestures, facial expressions, and eyeballs.

[0003] In related technologies, the eye-tracking module is typically placed on the outside of the optical module. However, this increases the size of the head-mounted display device, hindering its miniaturization. Utility Model Content

[0004] This application provides a display module and a head-mounted display device. The display module is small in size, which can solve the technical problem that the eye-tracking module is located on the outside of the optical module, resulting in an increase in the size of the head-mounted display device, which is not conducive to the miniaturization development.

[0005] The embodiments of this application provide the following technical solutions to solve the above-mentioned technical problems:

[0006] The first aspect of this application provides a display module, including a display screen, a lens assembly, and an eye-tracking assembly;

[0007] The lens assembly is located between the display screen and the user's eyeball. The display screen emits an image beam to the lens assembly, and the image beam enters the user's eyeball after passing through the lens assembly to form an image.

[0008] Between the display screen and the user's eyeball, the area through which the image beam passes forms an effective light zone. The eye-tracking component is located outside the effective light zone, and the orthographic projection of the eye-tracking component in the optical axis direction is located within the orthographic projection of the lens component in the optical axis direction.

[0009] The eye-tracking component includes a light source module and an imaging module, which are respectively disposed on opposite sides of the lens assembly along its axial direction.

[0010] The light source module is used to emit light to the user's eyeball, and the light reflected by the user's eyeball enters the imaging module to form an image of the user's eyeball.

[0011] In this embodiment, by placing the eye-tracking component outside the effective light area, and ensuring that the orthographic projection of the eye-tracking component in the optical axis direction is within the orthographic projection of the lens assembly in the optical axis direction, the eye-tracking component can be hidden between the display modules. This does not increase the size of the vertical optical axis or the size along the optical axis relative to the lens assembly and the display screen. In other words, the eye-tracking function is integrated without increasing the volume of the display module, enabling the display module to have eye-tracking functionality while maintaining a small size. This is beneficial for the miniaturization of the display module and the miniaturization of the head-mounted display device using the display module.

[0012] In one possible implementation, the lens assembly includes a first lens and a second lens assembly; wherein,

[0013] The outer diameter of the second lens assembly is larger than the outer diameter of the first lens;

[0014] In the optical axis direction, the second lens assembly is located between the first lens and the display screen, and the eye-tracking assembly is located between the first lens and the second lens assembly.

[0015] By setting the outer diameter of the second lens assembly to be larger than that of the first lens, an area that the image beam does not pass through can be formed between the first lens and the second lens assembly, which is the area outside the effective light area. For ease of description, the area that the image beam does not pass through within the orthographic projection coverage of the lens assembly along the optical axis is regarded as the invalid light area. In other words, an invalid light area is formed between the first lens and the second lens assembly. The eye-tracking component can then be placed in the invalid light area, which does not occupy space outside the lens assembly. The eye-tracking component can be hidden in the display module, which is conducive to the miniaturization of the display module.

[0016] In one possible implementation, the light source module and the imaging module are respectively located outside the first lens in a direction perpendicular to the optical axis; wherein,

[0017] The orthographic projection of the eye-tracking component in the optical axis direction is located within the orthographic projection of the second lens component in the optical axis direction, and outside the orthographic projection of the first lens in the optical axis direction.

[0018] The light emitted by the light source module to the user's eyeball, and the light that enters the imaging module after being reflected by the user's eyeball, do not pass through the first lens.

[0019] With this configuration, since neither the light emitted by the light source module to the user's eyeball nor the light reflected by the user's eyeball into the imaging module passes through the first lens, the light emitted by the light source module will not be lost during the reflection process, thereby improving the accuracy of the eye-tracking component.

[0020] In one possible implementation, the lens assembly includes a first lens and a second lens assembly; wherein,

[0021] In the direction of the optical axis, the second lens assembly is located between the first lens and the display screen;

[0022] The orthographic projection of the display screen in the optical axis direction is located within the orthographic projection of the second lens assembly in the optical axis direction;

[0023] The eye-tracking component is located between the second lens assembly and the display screen.

[0024] This configuration creates an ineffective light zone between the second lens assembly and the display screen. The eye-tracking component can then be placed within this ineffective light zone, thus avoiding the use of space outside the lens assembly and hiding the eye-tracking component within the display module. This is beneficial for the miniaturization of the display module.

[0025] In one possible implementation, the light source module and the imaging module are respectively located outside the display screen in a direction perpendicular to the optical axis of the display screen; wherein,

[0026] The orthographic projection of the eye-tracking component in the optical axis direction is located within the orthographic projection of the second lens component in the optical axis direction, and outside the orthographic projection of the display screen in the optical axis direction.

[0027] In one possible implementation, the second lens assembly includes a planar glass and a second lens;

[0028] The planar glass is located between the first lens and the second lens;

[0029] The first lens and the planar glass are spaced apart, and the second lens and the planar glass are also spaced apart.

[0030] In one possible implementation, the side of the flat glass closest to the user's eyeball is provided with a reflective polarizing film and a polarizing film in sequence;

[0031] The flat glass has a phase delay film and an anti-reflection film arranged sequentially on the side closest to the display screen.

[0032] By sequentially placing a reflective polarizing film and a polarizing film on the side of the flat glass closest to the user's eye, and a phase retardation film and an anti-reflection film on the side of the flat glass closest to the display screen, the optical axes of the reflective polarizing film and the phase retardation film are aligned (the optical axis of the reflective polarizing film coincides with the optical axis of the phase retardation film), thereby reducing stray light generated when the display module reflects light. The polarizing film reduces stray light caused by the precision of the reflective polarizing film itself, while the anti-reflection film reduces stray light reflected from the flat glass.

[0033] In one possible implementation, the ratio of the distance between the planar glass and the first lens to the distance between the planar glass and the second lens is in the range of 3-5;

[0034] The ratio of the thickness of the first lens to the thickness of the planar glass ranges from 1 to 10;

[0035] The ratio of the thickness of the planar glass to the thickness of the second lens is in the range of 0.1-0.5.

[0036] In one possible implementation, when the eye-tracking component is located between the first lens and the planar glass, the distance between the planar glass and the first lens in the optical axis direction, and the distance between the outer edge of the first lens and the outer edge of the planar glass in the direction perpendicular to the optical axis, are both greater than or equal to the outer diameter of the light source module and the imaging module.

[0037] When the eye-tracking component is located between the second lens component and the display screen, the distance between the second lens and the display screen in the optical axis direction, and the distance between the outer edge of the display screen and the outer edge of the second lens in the direction perpendicular to the optical axis, are both greater than or equal to the outer diameter of the light source module and the imaging module.

[0038] This setup provides sufficient space for the eye-tracking component, allowing it to be discreetly integrated into the display module without increasing its overall size.

[0039] In one possible implementation, both the first lens and the second lens are plastic lenses.

[0040] In one possible implementation, the side of the first lens facing the user's eyeball is concave, and the side of the first lens away from the user's eyeball is convex.

[0041] The second lens has a convex surface on both the side facing the display screen and the side facing away from the display screen.

[0042] In one possible implementation, a fixing component is also included for fixing the eye-tracking component.

[0043] A second aspect of this application provides a head-mounted display device, including the display module described in any of the first aspects above.

[0044] The beneficial effects of the head-mounted display device provided in this application embodiment are the same as those of the display module described above, and will not be repeated here.

[0045] In addition to the technical problems solved by this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions as described above, other technical problems that the display module and head-mounted display device provided by this application can solve, other technical features contained in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific embodiments. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments of this application or the prior art will be briefly introduced below. Obviously, the drawings described below are only a part of the embodiments of this application. These drawings and text descriptions are not intended to limit the scope of the concept of this application in any way, but to illustrate the concept of this application to those skilled in the art by referring to specific embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a schematic diagram of the structure of a display module provided in an embodiment of this application;

[0048] Figure 1A A schematic diagram of the orientation of a display module provided in an embodiment of this application.

[0049] Figure 2 This is an exploded view of a display module provided in an embodiment of this application;

[0050] Figure 3 This application provides an exploded structural diagram of a display module planar glass.

[0051] Figure 4 This is a schematic diagram of the structure of a display module provided in an embodiment of this application;

[0052] Figure 5 This is a schematic diagram of another display module provided in an embodiment of this application;

[0053] Figure 6 An MTF curve of a display module provided in an embodiment of this application;

[0054] Figure 7 A longitudinal spherical aberration curve of a display module provided in an embodiment of this application;

[0055] Figure 8 A field curve diagram of a display module provided in an embodiment of this application;

[0056] Figure 9 This is a distortion diagram of a display module provided in an embodiment of this application.

[0057] Explanation of reference numerals in the attached figures:

[0058] 100 - Display Module;

[0059] 10-Lens assembly;

[0060] 11-First lens;

[0061] 111 - First surface;

[0062] 112 - Second surface;

[0063] 12-Second lens assembly;

[0064] 121 - Flat glass;

[0065] 1211 - Third surface;

[0066] 1212 - Fourth surface;

[0067] 1213 - Reflective polarizing film;

[0068] 1214-Polarizing film;

[0069] 1215 - Phase Delay Plate;

[0070] 1216 - Anti-return membrane;

[0071] 122 - Second lens;

[0072] 1221 - Fifth surface;

[0073] 1222 - Sixth Surface;

[0074] 13-Optical axis;

[0075] 20-Display screen;

[0076] 30 - Eye-tracking components;

[0077] 31-Light source module;

[0078] 32 - Imaging module;

[0079] 40 - Fixed components;

[0080] L1 - First distance;

[0081] L2 - Second distance;

[0082] L3 - Third distance;

[0083] L4 - Fourth distance;

[0084] L5 - Fifth distance;

[0085] 200 - User eyeballs. Detailed Implementation

[0086] To enhance the user's immersive experience, it is often necessary to track the user's head, gestures, facial expressions, and eye movements. Among these, eye tracking is a technology that acquires information by tracking and recording human eye movements. By detecting the user's gaze direction, eye tracking can achieve more natural and intuitive human-computer interaction.

[0087] To enable eye-tracking functionality in a display module, an eye-tracking component can typically be added within the module, for example, by attaching it directly to the outside of the display module. However, this requires providing a mounting location for the eye-tracking component, such as finding a spot on the head-mounted display device. This presents challenges for installation, increases the size of the display module, hinders assembly, and impedes the miniaturization of head-mounted displays.

[0088] To address the aforementioned technical problems, embodiments of this application provide a display module and a head-mounted display device. The display module in this application integrates eye-tracking functionality by concealing the eye-tracking component within the display module itself, without increasing the module's size. This facilitates the miniaturization of head-mounted display devices.

[0089] First, the terms used in the embodiments of this application will be explained:

[0090] A reflective polarizing film (RP) is an optical thin film used to control and adjust the polarization properties of light. RP typically consists of multiple optical thin films, including a polarizing layer and a reflective layer. The polarizing layer selectively allows light rays in a specific direction to pass through, maintaining their polarization, while the reflective layer reflects unpolarized light back, thus suppressing background light. RP can reduce interference from ambient light and improve the visual effect of display devices.

[0091] A polarizing film (POL) is a thin film material with polarization properties that can selectively transmit or block polarized light in a specific direction. The working principle of a polarizing film is to use its microstructure to filter or select the polarization direction of light.

[0092] A quarter-wave plate (QWP) is an optical device that alters the polarization state and phase of incident light. The working principle of a QWP is based on the wavelength and phase difference of light. When incident light passes through a QWP, it experiences a quarter-wavelength phase difference. This phase difference alters the polarization state of the light, converting linearly polarized light into circularly polarized light, or vice versa.

[0093] Anti-reflection coating (AR) is a thin-film coating applied to the surface of optical devices to reduce reflection and scattering, thereby improving transmittance and optical performance. The main function of an AR coating is to create a specific interference effect between the incident light and the device surface by adjusting the thickness and refractive index of the film. This interference effect allows the reflected light waves of a specific wavelength to cancel out the original light wave, thus reducing reflection. Simultaneously, AR coatings can also reduce refractive losses by adjusting the refractive index of the film to bring the angle of refraction between the device surface and the film close to zero.

[0094] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0095] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0096] like Figure 1 As shown, the display module 100 provided in this embodiment includes a display screen 20, a lens assembly 10, and an eye-tracking assembly 30. The lens assembly 10 is located between the display screen 20 and the user's eyeball 200. The display screen 20 is used to emit an image beam to the lens assembly 10. The image beam enters the user's eyeball 200 after passing through the lens assembly 10 to form an image.

[0097] Between the display screen 20 and the user's eyeball 200, the area through which the image beam passes forms an effective light zone, which is the area covered by the light in the figure. The eye-tracking component 30 is located outside the effective light zone, and the orthographic projection of the eye-tracking component 30 in the direction of the optical axis 13 is located within the orthographic projection of the lens assembly 10 in the direction of the optical axis 13.

[0098] like Figure 1 As shown, the eye-tracking component 30 may include a light source module 31 and an imaging module 32, which are respectively disposed on opposite sides of the lens assembly 10 along the optical axis. That is, the light source module 31 and the imaging module 32 are located on opposite sides of the optical axis 13. The light source module 31 emits light to the user's eyeball 200, and the light reflected by the user's eyeball 200 enters the imaging module 32 to form an image of the user's eyeball 200.

[0099] It should be noted that the orthographic projection of the eye-tracking component 30 in the direction of the optical axis 13 is located within the orthographic projection of the lens assembly 10 in the direction of the optical axis 13. This means that the eye-tracking component 30 does not extend beyond the two sides of the lens assembly 10 in the radial direction. In other words, the eye-tracking component 30 is located within the range covered by the lens assembly 10 in the radial direction.

[0100] It should be noted that, as Figure 1A As shown, "axial direction" refers to the direction in which the central axis extends. In this embodiment, the axial direction of the lens assembly is the same as the optical axis 13 of the display module, that is... Figure 1A In the diagram, "C" refers to the direction of the lens assembly around the central axis. "Circumferential" refers to the direction around the center axis, which is direction A in the diagram. "Radial" refers to the directions perpendicular to the central axis and passing through the center of the circle, which is the direction through which the diameter passes, and is direction B in the diagram.

[0101] It should be noted that all components in the display module 100 are symmetrically arranged along the optical axis 13, that is to say, Figure 1 The two parts located above and below the optical axis 13 are symmetrically arranged with the optical axis 13 as the axis of symmetry.

[0102] For example, the light source module 31 can be an infrared transmitter and the imaging module 32 can be an infrared receiver. In this embodiment, the specific structure of the light source module 31 and the imaging module 32 is not further limited.

[0103] In this embodiment, by setting the eye-tracking component 30 outside the effective light area, and the orthographic projection of the eye-tracking component 30 in the optical axis 13 direction is located within the orthographic projection of the lens assembly 10 in the optical axis 13 direction, the eye-tracking component 30 can be hidden between the display modules 100. This does not increase the size of the vertical optical axis 13 or the size along the optical axis 13 direction relative to the lens assembly 10 and the display screen 20.

[0104] In other words, eye-tracking functionality is integrated without increasing the size of the display module 100, enabling the display module 100 to have eye-tracking capabilities while maintaining a smaller size. This is beneficial for the miniaturization of the display module 100 and the miniaturization of head-mounted display devices using the display module 100.

[0105] In one possible implementation, see [link to previous document]. Figure 1 As shown, the lens assembly 10 may include a first lens 11 and a second lens assembly 12. The outer diameter of the second lens assembly 12 is larger than the outer diameter of the first lens 11. Along the optical axis 13, the second lens assembly 12 is located between the first lens 11 and the display screen 20, and the eye-tracking component 30 is located between the first lens 11 and the second lens assembly 12.

[0106] By setting the outer diameter of the second lens assembly 12 to be larger than that of the first lens 11, an area that the image beam does not pass through can be formed between the first lens 11 and the second lens assembly 12, which is the area outside the effective light area. For ease of description, the area that the image beam does not pass through within the orthogonal projection coverage of the lens assembly 10 along the optical axis 13 is regarded as the invalid light area. In other words, an invalid light area is formed between the first lens 11 and the second lens assembly 12. The eye-tracking component 30 can then be placed in the invalid light area, which does not occupy space outside the lens assembly 10. The eye-tracking component 30 can be hidden in the display module 100, which is beneficial to the miniaturization of the display module 100.

[0107] For example, in the direction perpendicular to the optical axis, the light source module 31 and the imaging module 32 are respectively located outside the first lens 11. The orthographic projection of the eye-tracking component 30 in the direction of the optical axis 13 lies within the orthographic projection of the second lens component 12 in the direction of the optical axis 13, and outside the orthographic projection of the first lens 11 in the direction of the optical axis 13. The light emitted by the light source module 31 to the user's eyeball 200, and the light entering the imaging module 32 after being reflected by the user's eyeball 200, do not pass through the first lens 11.

[0108] With this configuration, since the light emitted by the light source module 31 to the user's eyeball 200 and the light reflected by the user's eyeball 200 and entering the imaging module 32 do not pass through the first lens 11, the light emitted by the light source module 31 will not be damaged during the reflection process, thereby improving the accuracy of the eye-tracking component 30.

[0109] In one possible implementation, such as Figure 2 As shown, the second lens assembly 12 may include a planar glass 121 and a second lens 122. The planar glass 121 is located between the first lens 11 and the second lens 122. The first lens 11 and the planar glass 121 are spaced apart, and the second lens 122 and the planar glass 121 are also spaced apart.

[0110] For example, a reflective polarizing film 1213 and a polarizing film 1214 are sequentially provided on the side of the flat glass 121 closest to the user's eyeball 200. A phase delay film 1215 and an anti-reflection film 1216 are sequentially provided on the side of the flat glass 121 closest to the display screen 20.

[0111] In this embodiment, the first lens 11 includes a first surface 111 and a second surface 112 that are opposite to each other along the optical axis 13, with the second surface 112 facing the planar glass 121. The planar glass 121 includes a third surface 1211 and a fourth surface 1212 that are opposite to each other along the optical axis 13, with the fourth surface 1212 facing the second lens 122. The second lens 122 includes a fifth surface 1221 and a sixth surface 1222 that are opposite to each other along the optical axis 13, with the sixth surface 1222 facing the display screen 20.

[0112] In one possible implementation, such as Figure 3 As shown, a reflective polarizing film 1213 is disposed on the third surface 1211, and a polarizing film 1214 is disposed on the side of the reflective polarizing film 1213 facing away from the third surface 1211. A phase retarder 1215 is disposed on the fourth surface 1212, and an anti-reflection film 1216 is disposed on the side of the phase retarder 1215 facing away from the fourth surface 1212. The sixth surface 1222 reflects the light reflected from the third surface 1211 to the plane glass 121 and transmits it through the plane glass 121.

[0113] For example, the thickness of polarizing film 1214 can be 0.06 mm, the thickness of reflective polarizing film 1213 can be 0.12 mm, the thickness of phase retardation film 1215 can be 0.06 mm, and the thickness of anti-reflection film 1216 can be 0.06 mm.

[0114] For example, the phase delay film 1215 can be a 1 / 4 phase delay film. Of course, in other embodiments, the phase delay film can also be set as other types of phase delay films. In this application embodiment, the type of phase delay film is not further limited.

[0115] By providing a reflective polarizing film 1213 on the third surface 1211 of the planar glass 121 and a phase retardation film 1215 on the fourth surface 1212, the reflective polarizing film 1213 and the phase retardation film 1215 are attached to the planar glass 121 and respectively on the third surface 1211 and the fourth surface 1212 of the planar glass 121, which facilitates the alignment of the optical axes of the reflective polarizing film 1213 and the phase retardation film 1215 (the optical axis of the reflective polarizing film 1213 coincides with the optical axis of the phase retardation film 1215), thereby reducing stray light generated when the display module 100 reflects light. A polarizing film 1214 is provided on the side of the reflective polarizing film 1213 facing away from the third surface 1211. The polarizing film 1214 can reduce stray light caused by the precision of the reflective polarizing film 1213. An anti-reflection film 1216 is provided on the side of the phase retarder 1215 facing away from the fourth surface 1212. The anti-reflection film 1216 can reduce the reflected stray light caused by the planar glass 121.

[0116] In one possible implementation, the ratio of the distance between the planar glass 121 and the first lens 11 to the distance between the planar glass 121 and the second lens 122 can be in the range of 3-5. For example,... Figure 4 As shown, the distance between the planar glass 121 and the first lens 11 can be the maximum distance between the second surface 112 and the third surface 1211, which is designated as the first distance L1 in this embodiment. The distance between the planar glass 121 and the second lens 122 can be the maximum distance between the fourth surface 1212 and the fifth surface 1221, which is designated as the second distance L2 in this embodiment. The ratio of the first distance L1 to the second distance L2 can range from 3 to 5, for example, it can be 3, 4, or 5. In this embodiment, the ratio of the distance between the planar glass 121 and the first lens 11 to the distance between the planar glass 121 and the second lens 122 is not further limited.

[0117] In one possible implementation, the ratio of the thickness of the first lens 11 to the thickness of the planar glass 121 can range from 1 to 10. For example, as shown... Figure 4 As shown, the thickness of the first lens 11 is the first thickness, and the thickness of the planar glass 121 is the second thickness. The ratio of the first thickness to the second thickness can be in the range of 1-10, for example, it can be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, etc. In the embodiments of this application, the ratio of the thickness of the first lens 11 to the thickness of the planar glass 121 is not further limited.

[0118] In one possible implementation, the ratio of the thickness of the planar glass 121 to the thickness of the second lens 122 ranges from 0.1 to 0.5. For example, as shown... Figure 4 As shown, the thickness of the second lens 122 is the third thickness, and the ratio of the second thickness to the third thickness can be in the range of 0.1-0.5. For example, it can be 0.1, 0.2, 0.3, 0.4, 0.5, etc. In this embodiment, the ratio of the thickness of the planar glass 121 to the thickness of the second lens 122 is not further limited.

[0119] In one possible implementation, when the eye-tracking component 30 is located between the first lens 11 and the planar glass 121, the distance between the planar glass 121 and the first lens 11 in the direction of the optical axis 13, and the distance between the outer edge of the first lens 11 and the outer edge of the planar glass 121 in the direction perpendicular to the optical axis are both greater than or equal to the outer diameters of the light source module 31 and the imaging module 32.

[0120] In other words, the light source module 31 and the imaging module 32 are located in the space between the outer edge of the outer periphery of the first lens 11 and the inner edge of the outer periphery of the planar glass 121. Furthermore, the light source module 31 and the imaging module 32 do not extend beyond the planar glass 121 in the radial direction.

[0121] This configuration provides sufficient space for the eye-tracking component 30, allowing it to be discreetly installed within the display module 100 without increasing its overall size.

[0122] When the eye-tracking component 30 is positioned between the second lens assembly 12 and the display screen 20, the distance between the second lens 122 and the display screen 20 along the optical axis 13, and the distance between the outer edge of the display screen 20 and the outer edge of the second lens 122 in the vertical direction of the optical axis 13, are both greater than or equal to the outer diameters of the light source module 31 and the imaging module 32. In other words, the light source module 31 and the imaging module 32 are located within the space between the outer edge of the outer periphery of the second lens 122 and the inner edge of the outer periphery of the display screen 20. Furthermore, the light source module 31 and the imaging module 32 do not extend beyond the second lens 122 in the radial direction of the planar glass 121.

[0123] This configuration provides sufficient space for the eye-tracking component 30, allowing it to be discreetly installed within the display module 100 without increasing its overall size.

[0124] like Figure 4As shown, the maximum distance from the sixth surface 1222 to the display screen 20 is the third distance L3. In the radial direction of the lens assembly 10, the distance between the outer edge of the first lens 11 and the outer edge of the second lens 122 is the fourth distance L4. In the direction perpendicular to the optical axis, the distance between the outer edge of the display screen 20 and the outer edge of the second lens 122 is the fifth distance L5.

[0125] When the eye-tracking component 30 is located between the first lens 11 and the flat glass 121, the first distance L1 and the fourth distance L4 are both greater than or equal to the outer diameter of the light source module 31, and the first distance L1 and the fourth distance L4 are both greater than or equal to the outer diameter of the imaging module 32.

[0126] When the eye-tracking component 30 is located between the second lens assembly 12 and the display screen 20, both the third distance L3 and the fifth distance L5 are greater than or equal to the outer diameter of the light source module 31, and both the third distance L3 and the fifth distance L5 are greater than or equal to the outer diameter of the imaging module 32. This configuration provides sufficient space for the eye-tracking component 30, allowing it to be concealed within the display module 100 without increasing its overall size.

[0127] like Figure 4 As shown, this creates a triangular region a between the first lens 11 and the flat glass 121, where no light passes through, meaning it is outside the effective light area. Therefore, the eye-tracking component 30 can be placed within region a, without increasing the size of the display module 100. Furthermore, since the light emitted from the light source module 31 to the user's eyeball 200, and the light reflected by the user's eyeball 200 and entering the imaging module 32, do not pass through the first lens 11, the light emitted from the light source module 31 is not lost during reflection, thereby improving the accuracy of the eye-tracking component 30.

[0128] In addition, a triangular region b is formed between the display screen 20 and the second lens 122. No light passes through this region b, which is outside the effective light area. Therefore, the eye-tracking component 30 can be placed in region b, so as not to increase the size of the display module 100 or affect the imaging effect.

[0129] like Figure 5 As shown, in the direction of optical axis 13, the second lens assembly 12 is located between the first lens 11 and the display screen 20. The orthographic projection of the display screen 20 in the direction of optical axis 13 lies within the orthographic projection of the second lens assembly 12 in the direction of optical axis 13, and the eye-tracking assembly 30 is located between the second lens assembly 12 and the display screen 20.

[0130] For example, the display screen 20 can be circular, rectangular, square, elliptical, or irregular in shape. When the display screen 20 is circular, the outer diameter of the second lens assembly 12 is larger than the outer diameter of the display screen 20. When the display screen is square, the outer diameter of the second lens assembly 12 is larger than the side length of the display screen 20. When the display screen is rectangular, the outer diameter of the second lens assembly 12 is larger than the maximum side length of the display screen 20.

[0131] This configuration creates an invalid light area between the second lens assembly 12 and the display screen 20, allowing the eye-tracking component 30 to be placed within this invalid light area. This avoids occupying space outside the lens assembly 10 and allows the eye-tracking component 30 to be hidden within the display module 100, which is beneficial for the miniaturization of the display module 100.

[0132] In one possible implementation, the light source module 31 and the imaging module 32 are located outside the display screen 20 in a direction perpendicular to the optical axis of the display screen 20. The orthographic projection of the eye-tracking component 30 in the optical axis 13 direction is located within the orthographic projection of the second lens component 12 in the optical axis 13 direction, and outside the orthographic projection of the display screen 20 in the optical axis 13 direction.

[0133] In one possible implementation, the first distance L1, the third distance L3, the fourth distance L4, and the fifth distance L5 are all greater than or equal to 4 mm. The outer diameter of the light source module 31 and the outer diameter of the imaging module 32 are both less than 4 mm.

[0134] For example, the first distance L1 is 5.2 mm, the radius of the first lens 11 is 18 mm, the radius of the flat glass 121 is 23 mm, and the fourth distance L4 is 5 mm. With this configuration, an invalid light area can be formed between the outer edge of the first lens 11 and the outer edge of the flat glass 121, and the eye-tracking component 30 can be placed in this invalid light area.

[0135] In one possible implementation, the display module 100 may further include a fixing component 40 (see [link]). Figure 1 As shown), the fixing component 40 is used to fix the eye-tracking component 30. The fixing component 40 is located outside the effective light area and within the orthographic projection of the lens assembly 10 along the optical axis 13. The fixing component 40 can be used to fix the eye-tracking component 30 outside the effective light area of ​​the display module 100. For example, the fixing component 40 can be used to fix the eye-tracking component 30 outside the effective light area between the first lens 11 and the flat glass 121 (see [reference]). Figure 1 (as shown), or, the eye-tracking component 30 can be fixed outside the effective light area between the second lens 122 and the display screen 20 (see...). Figure 5 (As shown).

[0136] For example, a fixing component 40 is provided on the outer side of the outer peripheral edge of the first lens 11, and both the light source module 31 and the imaging module 32 are fixed on the outer side of the first lens 11 by the fixing component 40.

[0137] For example, the first fixing component 40 may be disposed on the lens barrel (not shown in the figure) that houses the display module 100. Alternatively, the fixing component 40 may be located outside the first lens 11 and fixedly connected to the first lens 11, or the fixing component 40 may be located outside the first lens 11 and integrally formed with the first lens 11. In this embodiment of the application, the structure of the fixing component 40 is not further limited.

[0138] For example, the first distance L1 and the fourth distance L4 are equal, and both the first distance L1 and the fourth distance L4 are 5mm, 6mm, or 7mm, etc. The third distance L3 and the fifth distance L5 are equal, and both the third distance L3 and the fifth distance L5 are 6mm, 7mm, 8mm, 9mm, 10mm, etc.

[0139] It should be noted that the first distance L1, the third distance L3, the fourth distance L4, and the fifth distance L5 may be the same or different. In this embodiment of the application, the specific values ​​of the first distance L1, the third distance L3, the fourth distance L4, and the fifth distance L5 are not further limited.

[0140] In one possible implementation, both the first lens 11 and the second lens 122 are plastic lenses. The first surface 111 and the fifth surface 1221 are spherical. The second surface 112 and the sixth surface 1222 are aspherical, with the first surface 111 being concave and the second surface 112, the fifth surface 1221, and the sixth surface 1222 all being convex.

[0141] For example, the display screen 20 can be a 0.5-1.5 inch Micro OLED (micro organic light-emitting diode) display. In this embodiment, the size and type of the display screen 20 are not further limited.

[0142] For example, the first lens 11 and the second lens 122 can be made of the same material, with a refractive index of 1.54475 and an Abbe number of 56.3. The planar glass 121 can be made of optical glass (BK7), with a refractive index of 1.5168 and an Abbe number of 64.17. Of course, in other embodiments, the first lens 11, the planar glass 121, and the second lens 122 can also be made of other materials. In this embodiment, the materials of the first lens 11, the planar glass 121, and the second lens 122 are not further limited.

[0143] In the embodiments of this application, the size parameters of the first lens 11 can be referred to Table 1, and the size parameters of the second lens 122 can be referred to Table 2.

[0144] Table 1

[0145] First surface 111 (spherical) numerical values Y radius -683.6072788432 Second surface 112 (aspheric coefficient) Y radius -29.1876664121796 K value 0 4th order coefficients 1.60872669225218e-05 6th order coefficients -9.31035489262533e-09 8th order coefficients 3.12912514128732e-10 10th order coefficients -5.48307746691166e-13 12th order coefficients -9.38117787484432e-16 14th order coefficients 2.02253407935556e-18 16th order coefficients 1.00758626437865e-20 18th order coefficients 2.0700082459988e-23 20th order coefficients -1.25988374367356e-25

[0146] Table 2

[0147] Fifth surface 1221 (spherical) numerical values Y radius 7667.78899622762 Sixth surface 1222 (aspheric coefficient) Y radius -77.15822019608 K value 0 4th order coefficients -2.3229666194624e-06 6th order coefficients 5.95059595168453e-09 8th order coefficients -3.48235685038499e-11 10th order coefficients 1.16935045283344e-13 12th order coefficients -1.7545220373646e-16 14th order coefficients -5.19078473727634e-20 16th order coefficients 5.99421118988209e-22 18th order coefficients -8.26323254292544e-25 20th order coefficients 3.86908826001563e-28

[0148] It should be noted that "Y radius" in Tables 1 and 2 refers to the radius of curvature, and "K value" refers to a parameter related to the curvature of the lens. Especially when describing aspherical lenses, the surface shape of an aspherical lens can be described by an equation, where K is a key parameter called the conic constant.

[0149] As can be seen from Table 2, the radius of curvature of the fifth surface 1221 is very large, so that the fifth surface 1221 is close to a plane.

[0150] It should be noted that the MTF curve is a curve characterizing imaging performance, such as... Figure 6 As shown, the imaging performance at 80 line pairs / mm is above 0.4 in all fields of view, indicating that the display module 100 has good imaging performance.

[0151] Figure 7 This is a longitudinal spherical aberration curve diagram of a display module provided in an embodiment of this application. Figure 8 A field curve diagram of a display module provided in an embodiment of this application. Figure 9 This is a distortion diagram of a display module provided in an embodiment of this application.

[0152] It should be noted that longitudinal spherical aberration is an aberration caused by the shape of the spherical lens or mirror, primarily affecting image sharpness, especially in the central region of the image. For example... Figure 7 As shown, the longitudinal spherical aberration of the display module 100 in this embodiment is relatively small, resulting in good imaging quality. The three curves in the figure correspond to light of different wavelengths.

[0153] It should be noted that the field curvature diagram reflects the difference in image plane position for obtaining a sharp image in different fields of view, such as... Figure 8 As shown, the maximum field curvature of the display module 100 in this embodiment is less than 0.08 mm, so the image clarity of the display module 100 is good.

[0154] It should be noted that the distortion map reflects the difference in the position of the image plane that produces a sharp image in different fields of view, such as... Figure 9As shown, the absolute value of the distortion of the display module 100 in this embodiment is less than 30%, so the imaging quality of the display module 100 is good.

[0155] This application also provides a head-mounted display device, including the display module 100 of any of the first aspects described above.

[0156] The head-mounted display devices in this application include, but are not limited to, virtual reality headsets (VR Headsets), augmented reality glasses (AR Glasses), mixed reality devices (MR Devices), and smart glasses. In this application, the specific type of head-mounted display device is not further limited.

[0157] The beneficial effects of the head-mounted display device provided in this application embodiment are the same as those of the display module 100 described above, and will not be repeated here.

[0158] The terms "upper" and "lower" are used to describe the relative positions of the various structures in the accompanying drawings. They are only for clarity of description and are not intended to limit the scope of implementation of this application. Any changes or adjustments to the relative positions without substantially altering the technical content shall also be considered within the scope of implementation of this application.

[0159] It should be noted that, in this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0160] Furthermore, in this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0161] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0162] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A display module, characterized by Includes the display screen, lens assembly, and eye-tracking assembly; The lens assembly is located between the display screen and the user's eyeball. The display screen emits an image beam to the lens assembly, and the image beam enters the user's eyeball after passing through the lens assembly to form an image. Between the display screen and the user's eyeball, the area through which the image beam passes forms an effective light zone. The eye-tracking component is located outside the effective light zone, and the orthographic projection of the eye-tracking component in the optical axis direction is located within the orthographic projection of the lens component in the optical axis direction. The eye-tracking component includes a light source module and an imaging module, which are respectively disposed on opposite sides of the lens assembly along its axial direction. The light source module is used to emit light to the user's eyeball, and the light reflected by the user's eyeball enters the imaging module to form an image of the user's eyeball.

2. The display module of claim 1, wherein, The lens assembly includes a first lens and a second lens assembly; wherein... The outer diameter of the second lens assembly is larger than the outer diameter of the first lens; In the optical axis direction, the second lens assembly is located between the first lens and the display screen, and the eye-tracking assembly is located between the first lens and the second lens assembly.

3. The display module of claim 2, wherein, In a direction perpendicular to the optical axis, the light source module and the imaging module are respectively located outside the first lens; wherein, The orthographic projection of the eye-tracking component in the optical axis direction is located within the orthographic projection of the second lens component in the optical axis direction, and outside the orthographic projection of the first lens in the optical axis direction. The light emitted by the light source module to the user's eyeball, and the light that enters the imaging module after being reflected by the user's eyeball, do not pass through the first lens.

4. The display module of claim 1, wherein, The lens assembly includes a first lens and a second lens assembly; wherein... In the direction of the optical axis, the second lens assembly is located between the first lens and the display screen; The orthographic projection of the display screen in the optical axis direction is located within the orthographic projection of the second lens assembly in the optical axis direction; The eye-tracking component is located between the second lens assembly and the display screen.

5. The display module of claim 4, wherein, In a direction perpendicular to the optical axis of the display screen, the light source module and the imaging module are respectively located outside the display screen; wherein, The orthographic projection of the eye-tracking component in the optical axis direction is located within the orthographic projection of the second lens component in the optical axis direction, and outside the orthographic projection of the display screen in the optical axis direction.

6. The display module of any of claims 2-5, wherein, The second lens assembly includes a planar glass and a second lens; The planar glass is located between the first lens and the second lens; The first lens and the planar glass are spaced apart, and the second lens and the planar glass are also spaced apart.

7. The display module of claim 6, wherein, The side of the flat glass closest to the user's eyeball is provided with a reflective polarizing film and a polarizing film in sequence; The flat glass has a phase delay film and an anti-reflection film arranged sequentially on the side closest to the display screen.

8. The display module of claim 6, wherein, The ratio of the distance between the planar glass and the first lens to the distance between the planar glass and the second lens is in the range of 3-5; The ratio of the thickness of the first lens to the thickness of the planar glass ranges from 1 to 10; The ratio of the thickness of the planar glass to the thickness of the second lens is in the range of 0.1-0.

5.

9. The display module of claim 6, wherein, When the eye-tracking component is located between the first lens and the planar glass, the distance between the planar glass and the first lens in the optical axis direction, and the distance between the outer edge of the first lens and the outer edge of the planar glass in the direction perpendicular to the optical axis, are both greater than or equal to the outer diameter of the light source module and the imaging module. When the eye-tracking component is located between the second lens component and the display screen, the distance between the second lens and the display screen in the optical axis direction, and the distance between the outer edge of the display screen and the outer edge of the second lens in the direction perpendicular to the optical axis, are both greater than or equal to the outer diameter of the light source module and the imaging module.

10. The display module of any of claims 7-9, wherein, Both the first lens and the second lens are plastic lenses.

11. The display module of any of claims 7-9, wherein, The side of the first lens facing the user's eyeball is concave, and the side of the first lens away from the user's eyeball is convex. The second lens has a convex surface on both the side facing the display screen and the side facing away from the display screen.

12. The display module of any of claims 2-5, wherein, It also includes fixed components; among which, The fixing component is used to fix the eye-tracking component.

13. A head-mounted display device, comprising: Includes the display module as described in any one of claims 1-12.

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