Display optical module, display equipment and manufacturing method of display optical module

Abstract

The invention provides a display optical module, which comprises a base material with a mounting surface; the driving circuit is positioned on the mounting surface; the visual tracking light source assembly comprises a light-emitting element and a light blocking layer, the light-emitting element is connected to the side, away from the mounting surface, of the driving circuit, and the driving circuit is used for driving the light-emitting element to emit infrared light; the light blocking layer is located on the installation surface and located between the base material and the light-emitting element, the orthographic projection of the light-emitting element on the installation surface and the orthographic projection of the light blocking layer on the installation surface at least partially coincide, and the light blocking layer is used for reflecting the infrared light in the direction away from the base material. And the infrared light is used for tracking sight movement of human eyes. The invention further provides display equipment and a manufacturing method of the display optical module.

Description

Technical Field

[0001] This application relates to the field of wearable display technologies, and particularly to a display optical module, a display device including the display optical module, and a method for manufacturing the display optical module for manufacturing the display optical module. Background Art

[0002] The goal of Augmented Reality (AR) glasses is to have a larger field of view and a more personalized operation method. In this process, eye tracking technology can provide multiple solutions.

[0003] One eye tracking solution is to use infrared light as an additional light source, so that the infrared light is reflected on the cornea, and a sensor is used to receive the reflected infrared light to track the movement of the user's eyeball. Due to the reflection of the infrared light by the display optical module in the above solution, the infrared light forms a ghosting phenomenon at the cornea, forming interfering light spots and affecting eye tracking. Summary of the Invention

[0004] In view of this, it is necessary to provide a display module, a display device including the display module, and a method for manufacturing the display optical module for manufacturing the display optical module, so as to improve the problem that interfering light spots affect eye tracking and improve the accuracy of eye tracking.

[0005] In a first aspect of this application, a display optical module is provided, including: a substrate having an installation surface; a driving circuit located on the installation surface; and an eye tracking light source component including a light emitting element and a light blocking layer. The light emitting element is connected to a side of the driving circuit away from the installation surface, and the driving circuit is used to drive the light emitting element to emit infrared light; the light blocking layer is located on the installation surface and between the substrate and the light emitting element. The positive projection of the light emitting element on the installation surface at least partially coincides with the positive projection of the light blocking layer on the installation surface. The light blocking layer is used to reflect the infrared light in a direction away from the substrate, and the infrared light is used to track the movement of the human eye's line of sight.

[0006] In a second aspect of this application, a display device is provided, including: a microdisplay for emitting image light; the display optical module as described above, for conducting ambient light and the image light to the human eye to display an AR image, and for receiving the infrared light reflected by the human eye to track the movement of the human eye's line of sight when observing the AR image.

[0007] A third aspect of the present application provides a display device, comprising: providing a substrate having an installation surface; depositing and forming a driving circuit on the installation surface; depositing a light blocking layer on the installation surface, the light blocking layer being spaced and insulated from the driving circuit; and soldering a light emitting element on a side of the driving circuit away from the installation surface, such that the light blocking layer is located between the substrate and the light emitting element, and a positive projection of the light emitting element on the installation surface at least partially coincides with a positive projection of the light blocking layer on the installation surface; the driving circuit is configured to drive the light emitting element to emit infrared light, the light blocking layer is configured to reflect the infrared light in a direction away from the substrate, and the infrared light is used to track the movement of the human eye's line of sight.

[0008] In the above display optical module, display device and method for manufacturing a display optical module, the display optical module includes a light emitting element that emits infrared light toward a side away from the display layer. Among them, a part of the infrared light may be emitted toward the side where the display layer is located. By providing a light blocking layer, this part of the infrared light can be reflected back. In this way, the infrared light is prevented from entering the display layer, so that the infrared light is incident on the human eye as much as possible and a light spot is formed at the same position of the human eye, avoiding the formation of interfering light spots. Therefore, by providing a light blocking layer in the present application, it is beneficial to improve the accuracy of line of sight tracking. Description of the Drawings

[0009] Figure 1 It is a schematic structural diagram of the display device according to an embodiment of the present application.

[0010] Figure 2 It is a schematic plan view of the display optical module in Embodiment 1 of the present application.

[0011] Figure 3 is Figure 2 a side view of the display optical module in

[0012] Figure 4 is Figure 2 a schematic plan view of a part of the substrate, a part of the driving circuit and a line-of-sight tracking light source assembly in the display optical module shown in

[0013] Figure 5 is Figure 4 a schematic plan view after removing the light emitting material layer.

[0014] Figure 6 is Figure 4 a front view of

[0015] Figure 7 is Figure 4 a schematic cross-sectional structure view along the C-C direction.

[0016] Figure 8 It is a schematic optical path diagram of infrared light in a comparative display optical module.

[0017] Figure 9 It is a schematic diagram of the optical path of infrared light in the display optical module according to the first embodiment of the present application.

[0018] Figure 10 It is a schematic plan view of some substrates, some drive circuits and a view tracking light source assembly in the display optical module according to a modified embodiment of the present application.

[0019] Figure 11 It is Figure 10 A schematic plan view after removing the light-emitting material layer.

[0020] Figure 12 It is Figure 10 The front view of

[0021] Figure 13 It is Figure 10 A schematic sectional view along the D-D direction.

[0022] Figure 14 It is a schematic plan view of some substrates, some drive circuits and a view tracking light source assembly in the display optical module according to the second embodiment of the present application.

[0023] Figure 15 It is Figure 14 A schematic plan view after removing the light-emitting material layer.

[0024] Figure 16 It is Figure 14 A schematic sectional view along the E-E direction.

[0025] Figure 17 It is Figure 14 A schematic sectional view along the F-F direction.

[0026] Figure 18 It is a schematic plan view of some substrates, some drive circuits and a view tracking light source assembly in the display optical module according to the third embodiment of the present application.

[0027] Figure 19 It is Figure 18 A schematic plan view after removing the light-emitting material layer.

[0028] Figure 20 It is Figure 18 A schematic sectional view along the G-G direction.

[0029] Figure 21 It is Figure 18 A schematic sectional view along the H-H direction.

[0030] Figure 22Schematic plan view of part of the base material, part of the drive circuit and a view-tracking light source component in the display optical module according to Embodiment 4 of the present application.

[0031] Figure 23 It is Figure 22 Schematic plan view after removing the light-emitting material layer.

[0032] Figure 24 It is Figure 22 Schematic cross-sectional view along the I-I direction.

[0033] Figure 25 It is Figure 22 Schematic cross-sectional view along the J-J direction.

[0034] Description of main component symbols

[0035] Display device: 100;

[0036] Optical systems: 101, 102;

[0037] Microdisplay: 1;

[0038] Display optical module: 2;

[0039] Display layer: 21;

[0040] Base material: 22;

[0041] Connection surface: 221;

[0042] Mounting surface: 222;

[0043] Drive circuit: 23;

[0044] First circuit unit: 231;

[0045] Second circuit unit: 232;

[0046] Solders: C1, C2;

[0047] View-tracking light source component: 24;

[0048] Light-emitting element: 241;

[0049] Light-emitting material layer: B;

[0050] First electrode: P;

[0051] Second electrode: N;

[0052] Light-blocking layer: 242;

[0053] Air gap: A;

[0054] Insulating layer: 243;

[0055] First insulating part: D1;

[0056] Second insulating part: D2;

[0057] Eye tracking sensor: 25;

[0058] Adhesive layer: 26;

[0059] Image light: L1;

[0060] Ambient light: L2;

[0061] Infrared light: L3, L31, L32. Detailed implementation manners

[0062] Please refer to Figure 1 , the display device 100 of the embodiment of the present application is an AR glasses. When the user wears the display device 100 on the head, the user's eyes can receive the image light L1 projected by the display device 100, so as to observe the projected image. At the same time, the ambient light L2 in the real environment where the user is located can also be transmitted into the human eye from the display device 100, so that the human eye can also observe the image of the real world. The image of the real world is combined with the projected image displayed by the display device 100, and the human eye can observe the projected image superimposed on the image of the real world, that is, the AR image.

[0063] The display device 100 includes optical systems 101 and 102 with basically the same structure and function. The optical system 101 corresponds to the left lens and is used to form an image for the user's left eye; the optical system 102 corresponds to the right lens and is used to form an image for the user's right eye. In at least one implementation manner, the polarization directions of the image light projected by the optical systems 101 and 102 onto the human eye are different, so that the human eye can observe a stereoscopic image effect.

[0064] The following takes the optical system 101 as an example to describe its structure and function.

[0065] The optical system 101 includes a microdisplay 1 and a display optical module 2. The microdisplay 1 is used to emit the image light L1. The display optical module 2 is located on the optical path of the image light L1 and is used to conduct the image light L1 and project the image light L1 into the user's eye box for imaging.

[0066] The microdisplay 1 can be disposed at the position where the temple connects to the lens, and its size generally does not exceed 3 inches. The microdisplay 1 can be a Micro Light-emitting Diode (Micro LED) microdisplay, a display based on Digital Light Processing (DLP) technology, a Liquid Crystal On Silicon (LCoS) display, etc. The image light L1 emitted by the microdisplay 1 can include light beams in three bands of red, green, and blue to present a color image. In at least one embodiment, the microdisplay 1 can also emit light beams of a single wavelength or a single band or a single color.

[0067] The display optical module 2 is located at the lens. For example, the display optical module 2 is embedded in the lens. The display optical modules 2 in the optical systems 101 and 102 are respectively located at the two lenses and display images corresponding to the left and right eyes of the wearer. In this application, the display optical module 2 is also integrated with a gaze tracking function for tracking the movement trajectory of the wearer's gaze based on the infrared light L3.

[0068] When the wearer observes the image displayed by the display device 100, the fixation point may change according to different image contents. The above gaze tracking is also called fixation point tracking. A method for near-eye gaze tracking is based on the Pupil-Corneal Reflection (PCCR) method, and the implementation steps are as follows: emit infrared light L3 (wavelength 850nm / 960nm) to the human eye, and the human cornea reflects the infrared light L3 to generate Purkinje spots on the surface of the human eye; capture images of the human eye and the Purkinje spots through an infrared camera; calculate the position of the Purkinje spots and the position of the pupil center through image analysis, calculate the vector relationship between the pupil center and the Purkinje spots, and through screen correction, map the vector relationship into a screen coordinate conversion relationship to achieve gaze tracking.

[0069] However, the above gaze tracking method is prone to generating stray light to form interference spots in some cases, which affects the accuracy of gaze tracking. In this application, by setting a light blocking layer in the display optical module 2, it is beneficial to improve the influence of the interference spots.

[0070] Embodiment 1

[0071] Please refer to Figure 2 and Figure 3 , in the first embodiment of this application, the display optical module 2 includes a display layer 21, a substrate 22, a driving circuit 23 ( Figure 3 the driving circuit is not shown), and a plurality of gaze tracking light source components 24 ( Figure 3The position of the eye-tracking light source assembly is simply shown, and the specific structure of the eye-tracking light source assembly is not shown), and the eye-tracking sensor 25. The substrate 22 is disposed on one side of the display layer 21. The substrate 22 has a connection surface 221 and a mounting surface 222. The connection surface 221 of the substrate 22 is located between the mounting surface 222 and the display layer 21. The driving circuit 23 is formed on the mounting surface 222 (only one driving circuit 23 is included in the display optical module 2, and the driving circuit 23 continuously extends over the entire mounting surface 222, Figure 2 Since only the part where the driving circuit 23 is connected to each eye-tracking light source assembly 24 is shown and other parts are omitted, Figure 2 the various parts of the driving circuit 23 shown in are separated). Each eye-tracking light source assembly 24 is fixedly electrically connected to the side of the driving circuit 23 away from the mounting surface 222. The eye-tracking light source assemblies 24 are spaced apart from each other and are circumferentially distributed in the edge region of the mounting surface 222. The eye-tracking sensor 25 is located in the spectacle frame part of the display device 100 and is arranged in the direction of the human eye for capturing the human eye image.

[0072] The display layer 21 may include optical devices such as a light guiding structure (e.g., a waveguide), a light coupling-in structure (e.g., a coupling-in grating formed on the surface of the light guiding structure), a light coupling-out structure (e.g., a coupling-out grating formed on the surface of the light guiding structure) (not shown in the figure), etc., for conducting and coupling out the image light from the micro display within the range of the human eye box so that the human eye can observe the image. The substrate 22 is a light-transmissive substrate for carrying the display optical module 2. The substrate 22 may be a material with a relatively high visible light transmittance such as silicon dioxide (SiO2). The circuit pattern of the driving circuit 23 can be formed by depositing a conductive metal layer on the surface of the substrate 22 for driving each eye-tracking light source assembly 24 to emit light. The eye-tracking light source assembly 24 is used to emit infrared light L3 in the direction of the human eye under the control of the driving circuit 23. The eye-tracking sensor 25 is used to receive the infrared light L3 reflected by the human eye to track the human eye line of sight.

[0073] The display optical module 2 further includes an adhesive layer 26. The adhesive layer 26 is located between the display layer 21 and the substrate 22 for adhesively fixing the display layer 21 and the substrate 22. The adhesive material used for the adhesive layer 26 is a transparent adhesive with a high transmittance and a low refractive index to transmit the ambient light L2. The pasting method of the adhesive layer 26 can be a dotting method or a surface gluing method.

[0074] To Figure 3Taking the orientation as a reference, when the user wears the display device 100, the human eye 200 is located on the side of the visual tracking light source component 24 away from the display layer 21. The display layer 21 couples out the image light L1 toward the side where the human eye is located. The image light L1 passes through the adhesive layer 26 and the substrate 22 in sequence and then enters the eye box. The ambient light L2 can enter from the side of the display layer 21 away from the substrate 22, passes through the display layer 21, the adhesive layer 26, and the substrate 22 in sequence and then enters the eye box, and after being superimposed with the image light L1, the human eye 200 can observe the AR image.

[0075] Please refer to Figure 4 , Figure 5 , Figure 6 and Figure 7 , each visual tracking light source component 24 includes a light-emitting element 241 and a light-blocking layer 242 (from Figure 6 and Figure 7 it can be seen that the material layer edges of the visible driving circuit 23 and the light-blocking layer 242 are inclined surfaces relative to the mounting surface 222 instead of being perpendicular to the mounting surface 222. This is due to actual manufacturing process limitations; in actual products, the inclination angle of the edges of the driving circuit 23 and the light-blocking layer 242 is extremely small; Figure 4 and Figure 5 the above-mentioned "inclined surface" feature is not shown in the plan view, and it is diagrammed with an idealized structure perpendicular to the mounting surface 222, which is also beneficial to avoiding the clutter of the contour lines of each material layer).

[0076] The light-emitting element 241 is electrically connected to the side of the driving circuit 23 away from the mounting surface, and is used to emit infrared light L3 under the drive of the driving circuit 23. The light-blocking layer 242 is formed on the mounting surface 222 by a deposition method and is located between the light-emitting element 2411 and the substrate 22. The light-blocking layer 242 is used to reflect the infrared light L3 emitted toward the substrate 22 side toward the side where the human eye is located, so as to prevent the infrared light L3 from continuing to propagate to the display layer 21.

[0077] The light-emitting element 241 is a light-emitting diode, for example, a micro light-emitting diode (Micro light-emitting Diode, Micro-LED). The light-emitting element 241 includes a first electrode P, a second electrode N, and a light-emitting material layer B respectively connecting the first electrode P and the second electrode N. One of the first electrode P and the second electrode N is used as the positive electrode, and the other is used as the negative electrode. The side of the driving circuit 23 away from the substrate 22 is electrically connected to the first electrode P and the second electrode N respectively through solder S1 and S2, so as to apply a driving voltage to the light-emitting material layer B through the first electrode P and the second electrode N, so that the light-emitting material layer B emits infrared light L3.

[0078] The first electrode P and the second electrode N are connected to the same side of the light-emitting material layer B at intervals. The first electrode P and the second electrode N are located between the driving circuit 23 and the light-emitting material layer B. The part of the driving circuit 23 connected to the visual tracking light source assembly 24 includes a first circuit unit 231 and a second circuit unit 232 that are spaced apart from each other. The first electrode P is connected to the first circuit unit 231, and the second electrode N is connected to the second circuit unit 232. In this way, the area of the mounting surface 222 located between the first circuit unit 231 and the second circuit unit 232 is exposed relative to the driving circuit 23. Therefore, an air gap A is formed between the light-emitting material layer B and the mounting surface 222.

[0079] The light-blocking layer 242 is formed on the mounting surface 222 and is in direct contact with the mounting surface 222. In at least one embodiment, the light-blocking layer 242 is formed by electroplating. The light-blocking layer 242 and the driving circuit 23 are arranged on the same layer on the mounting surface 222 and are spaced apart from each other to prevent short circuits. The light-blocking layer 242 has a symmetric "I"-shaped structure to avoid the driving circuit 23. The light-blocking layer 242 extends from one side of the driving circuit 23, through the air gap A, to the other side of the driving circuit 23. That is, the light-blocking layer 242 is partially located in the aforementioned air gap A. Different materials are selected for the light-blocking layer 242 and the driving circuit 23. In the direction perpendicular to the mounting surface 222, the thickness of the light-blocking layer 242 is less than the thickness of the driving circuit 23.

[0080] The light-blocking layer 242 can be, for example, gold, silver, copper, or a composite material including gold, silver, and copper. The light-blocking layer 242 has a high reflectivity and a low absorption rate for the infrared light L3. In at least one embodiment, the reflectivity of the light-blocking layer 242 for the infrared light L3 is greater than or equal to 95%, and the absorption rate for the infrared light L3 is less than or equal to 5%. Table 1 below shows the reflectivity and absorption rate of the light-blocking layer 242 for the infrared light L3 with a wavelength of 800 nm when gold, silver, and copper materials are selected.

[0081] Table 1

[0082]

[0083] Please refer to Figure 8 , in a comparative example, a display optical module includes a display layer 310, a substrate 320, a driving circuit 330, and a plurality of visual tracking light source assemblies 340. The visual tracking light source assemblies 340 are used to emit infrared light toward the side where the human eye E is located. A part of the infrared light (defined as the first infrared light L31) emitted by the visual tracking light source assemblies 340 directly reaches the human eye E after being emitted from the visual tracking light source assemblies 340, while another part of the infrared light (defined as the second infrared light L32) may propagate toward the side where the display layer 310 is located due to light leakage problems.

[0084] The first infrared light L31 can generate a light spot on the cornea of the human eye E, called the Purkinje spot. After the second infrared light L32 propagates to the display layer 310, it will be reflected by the display layer 310. The second infrared light L322 reflected by the display layer 310 can also be focused on the human eye E and generate a light spot. Since the distance between the display layer 310 and the visual tracking light source assembly 340 is relatively far, the first infrared light L31 directly emitted by the visual tracking light source assembly 24 and the second infrared light L32 reflected by the display layer 310 will be focused on different positions of the human eye, which causes the light spots generated by the first infrared light L31 and the second infrared light L32 on the cornea of the human eye E not to coincide. That is, the second infrared light L32 will generate interfering light spots (also called ghost images). The existence of the interfering light spots makes it impossible to determine which light spots need to be used for calculation in the subsequent image processing process, resulting in a decrease in the accuracy of gaze tracking or even the inability to achieve gaze tracking.

[0085] In this embodiment, the above problem is improved by setting a light blocking layer 242 in each visual tracking light source assembly 24. Please refer to Figure 9 . The light blocking layer 242 is located on the side of the light emitting element 241 close to the display layer 21. When the second infrared light L32 emitted by the light emitting element 241 is emitted towards the display layer 21, it first reaches the light blocking layer 242. Since the light blocking layer 242 has a high reflectivity to infrared light, it can effectively prevent the second infrared light L32 from continuing to propagate forward to the display layer 21. Moreover, since the light blocking layer 242 has a low absorption rate for infrared light, it can also reduce the loss of infrared light, enabling the infrared light to be reflected to the human eye as much as possible for gaze tracking, which is beneficial to improving the light efficiency of the infrared light.

[0086] The first infrared light L3 is incident on the human eye 200 to form a Purkinje spot for gaze tracking. Since the distance between the light emitting material layer B and the light blocking layer 242 is very small (it can be as small as dozens of micrometers), the distance between the light spot formed by the second infrared light L3 reflected from the light blocking layer 242 on the human eye and the geometric center of the above Purkinje spot is also very small, less than 0.1 mm. The deviation between the positions of the above light spots can be ignored in near-eye imaging, and it can be considered that the light spots formed by the first infrared light L3 and the second infrared light L3 on the human eye almost completely coincide. Thus, it can be seen that by setting the light blocking layer 242 in this application, the interfering light spots can be effectively eliminated and the accuracy of gaze tracking can be improved.

[0087] In order to reflect as much of the infrared light L3 emitted toward the direction where the display layer 21 is located as possible, it is set that the orthographic projection area of the light-blocking layer 242 on the mounting surface 222 is larger than the orthographic projection of the light-emitting material layer B on the mounting surface 222. Also, the driving circuit 23 can also reflect part of the infrared light L3. The orthographic projections of the light-blocking layer 242 and the driving circuit 23 on the mounting surface 222 almost completely cover the orthographic projection of the light-emitting material layer B on the mounting surface 222 (since there is a gap between the light-blocking layer 242 and the driving circuit 23 for mutual electrical insulation, the orthographic projections of the light-blocking layer 242 and the driving circuit 23 on the mounting surface 222 cannot completely cover the orthographic projection of the light-emitting material layer B on the mounting surface 222, but the gap is extremely small). Thus, it is beneficial to reflect as much infrared light L3 as possible.

[0088] Please refer to Figure 10 、 Figure 11 、 Figure 12 and Figure 13 as well. In a modified embodiment of the first embodiment, the light-blocking layer 242 and the driving circuit 23 can be made of the same material, and in the direction perpendicular to the mounting surface 222, the thicknesses of the light-blocking layer 242 and the driving circuit 23 are equal. In this modified embodiment, the light-blocking layer 242 and the driving circuit 23 are also arranged on the same layer and spaced apart from each other. By setting the light-blocking layer 242 and the driving circuit 23 to be made of the same material in this modified embodiment, the light-blocking layer 242 and the driving circuit 23 can be formed simultaneously in the same manufacturing process, which is beneficial to simplifying the manufacturing process.

[0089] Embodiment Two

[0090] Please refer to Figure 14 、 Figure 15 、 Figure 16 and Figure 17 as well. In the second embodiment of the present application, the main difference between the display optical module 2 and the display optical module in the first embodiment is that in the display optical module 2 of this embodiment, the view-following light source assembly 340 further includes an insulating layer 243.

[0091] In the second embodiment, the light-blocking layer 242 and the driving circuit 23 are arranged on the same layer and spaced apart from each other on the mounting surface 222. Part of the light-blocking layer 242 is located in the gap area between the light-blocking layer 242 and the driving circuit 23 and is in direct contact with the mounting surface 222, and the other part extends from this gap area toward the driving circuit 23 to cover the edge area of the driving circuit 23. That is, the insulating layer 243 is also partially located in the air gap A. In at least one embodiment, the insulating layer 243 is formed by a deposition method.

[0092] Since the part of the driving circuit 23 connected to the visual tracking light source assembly 24 includes the mutually separated first circuit unit 231 and second circuit unit 232. The insulating layer 243 also correspondingly includes the mutually separated first insulating part D1 and second insulating part D2. The first insulating part D1 and the second insulating part D2 have basically the same structure.

[0093] The first insulating part D1 is located in the interval area between the light blocking layer 242 and the first circuit unit 231 and is in direct contact with the mounting surface 222, and another part extends from this interval area to the first circuit unit 231 to cover the edge area of the first circuit unit 231. The second insulating part D2 is located in the interval area between the light blocking layer 242 and the second circuit unit 232 and is in direct contact with the mounting surface 222, and another part extends from this interval area to the second circuit unit 232 to cover the edge area of the second circuit unit 232.

[0094] The first insulating part D1 and the second insulating part D2 are respectively partially located in the air gap A. The orthographic projections of the first insulating part D1 and the second insulating part D2 on the mounting surface 222 respectively have the Figure 15 shown "U"-shaped planar structure.

[0095] The display optical module 2 of this embodiment has all the beneficial effects of the display optical module 2 in the first embodiment. On this basis, by arranging the insulating layer 243 to be filled between the light blocking layer 242 and the driving circuit 23, it can better insulate the light blocking layer 242 and the driving circuit 23 electrically.

[0096] Embodiment Three

[0097] In the third embodiment of the present application, the difference between the display optical module 2 and the display optical module 2 in the second embodiment is mainly that in the display optical module 2 of this embodiment, the structures of the insulating layer 243 and the light blocking layer 242 are different.

[0098] Please refer to Figure 18 、 Figure 19 、 Figure 20 and Figure 21 , in this embodiment, the insulating layer 243 is an integral body. The insulating layer 243 is partially located on the mounting surface 222 and is in direct contact with the mounting surface 222, and another part extends to the driving circuit 23 to cover the edge areas of the first circuit unit 231 and the second circuit unit 232 respectively. The orthographic projection of the insulating layer 243 on the mounting surface 222 has a "work" - shaped planar structure, extending from one side of the driving circuit 23, passing through the air gap A, to the other side of the driving circuit 23.

[0099] The light-blocking layer 242 is entirely located on the side of the insulating layer 243 away from the mounting surface 222 and does not contact the mounting surface 222. The orthographic projection of the insulating layer 243 on the mounting surface 222 completely covers the orthographic projection of the light-blocking layer 242 on the mounting surface 222. The sum of the orthographic projections of the insulating layer 243, the first circuit unit 231, and the second circuit unit 232 on the mounting surface 222 completely covers the orthographic projection of the light-emitting material layer B on the mounting surface 222 to reflect as much infrared light L3 as possible.

[0100] The display optical module 2 of this embodiment has all the beneficial effects of the display optical module 2 in the second embodiment. On this basis, by setting the light-blocking layer 242 entirely on the insulating layer 243, with the insulating layer 243 located between the driving circuit 23 and the light-blocking layer 242, the area of the insulating layer 243 is greatly increased, and it has a better insulating effect.

[0101] Embodiment 4

[0102] In the fourth embodiment of the present application, the main difference between the display optical module 2 and the display optical modules 2 in the second and third embodiments is that the structure of the light-blocking layer 242 in the display optical module 2 of this embodiment is different.

[0103] Please refer to Figure 22 , Figure 23 , Figure 24 and Figure 25 , in this embodiment, the shape setting position of the insulating layer 243 is the same as that of the insulating layer 243 in the second embodiment. The light-blocking layer 242 is also in the shape of a "worker", extending from one side of the driving circuit 23 on the mounting surface 222, passing through the air gap A, to the other side of the driving circuit 20. Part of the light-blocking layer 242 is in direct contact with the mounting surface 222, and the other part extends to the insulating layer 243 and covers the side of the insulating layer 243 away from the mounting surface.

[0104] The display optical module 2 of this embodiment has all the beneficial effects of the display optical modules 2 in the first and second embodiments. On this basis, the light-blocking layer 242 extends to the surface of the insulating layer 243. On the one hand, since the insulating layer 243 is located between the driving circuit 23 and the light-blocking layer 242, it can insulate the driving circuit 23 and the light-blocking layer 242 electrically. On the other hand, the light-blocking layer 242 extends more area towards the side where the driving circuit is located, so that the orthographic projections of the light-blocking layer 242 and the driving circuit 23 on the mounting surface 222 have an overlapping area. Then, the sum of the orthographic projections of the light-blocking layer 242 and the driving circuit 23 on the mounting surface 222 completely covers the orthographic projection of the light-emitting material layer B on the mounting surface 222, which is beneficial for the light-blocking layer 242 to block more infrared light L3 from entering the display layer 21. Therefore, it is beneficial to further improve the accuracy of gaze tracking.

[0105] The embodiment of the present application further provides a method for manufacturing a display optical module, including the following steps:

[0106] Provide a substrate 22 having an installation surface 222;

[0107] Deposit and form a driving circuit 23 on the installation surface 222;

[0108] Deposit a light-blocking layer 242 on the installation surface 222, and the light-blocking layer 242 is insulated from the driving circuit 23 at intervals; and

[0109] Weld a light-emitting element 241 on the side of the driving circuit 23 away from the installation surface 222, so that the light-blocking layer 242 is located between the substrate 22 and the light-emitting element 241, and the positive projection of the light-emitting element 241 on the installation surface 222 at least partially coincides with the positive projection of the light-blocking layer 242 on the installation surface 222; the driving circuit 23 is used to drive the light-emitting element 241 to emit infrared light, the light-blocking layer 242 is used to reflect infrared light in the direction away from the substrate 22, and the infrared light is used to track the movement of the human eye line of sight.

[0110] The method for manufacturing the display optical module can manufacture and form the display optical module in any of the foregoing embodiments, and can achieve any of the foregoing beneficial effects.

[0111] Those of ordinary skill in the art of this technology should recognize that the above embodiments are only used to illustrate the present application, rather than to limit the present application. As long as it is within the scope of the substantial spirit of the present application, appropriate changes and variations made to the above embodiments fall within the scope of protection required by the present application.

Claims

1. A display optical module, characterized in that: include: a substrate having a mounting surface; A driving circuit, located on the mounting surface; as well as A visual tracking light source assembly, comprising a light-emitting element and a light blocking layer, wherein the light-emitting element is connected to a side of the driving circuit away from the mounting surface, and the driving circuit is used to drive the light-emitting element to emit infrared light; The light blocking layer is located on the mounting surface and between the substrate and the light emitting element. The orthographic projection of the light emitting element on the mounting surface at least partially overlaps with the orthographic projection of the light blocking layer on the mounting surface. The light blocking layer is used to reflect the infrared light in a direction away from the substrate, and the infrared light is used to track the movement of the human eye.

2. The display optical module according to claim 1, wherein: The light blocking layer and the driving circuit are arranged in the same layer of the mounting surface and are spaced apart from each other. An air gap is formed between the light emitting element and the mounting surface, and at least a portion of the light blocking layer is located in the air gap.

3. The display optical module according to claim 2, characterized in that: In a direction perpendicular to the mounting surface, a thickness of the light blocking layer is less than or equal to a thickness of the driving circuit.

4. The display optical module according to claim 2, wherein: The light blocking layer includes the same material as the driving circuit.

5. The display optical module according to claim 2, wherein: The invention also includes an insulating layer, which is located between the light blocking layer and the driving circuit and is used to electrically insulate the light blocking layer from the driving circuit.

6. The display optical module according to claim 5, characterized in that: The insulating layer partially covers the driving circuit and partially directly contacts the mounting surface.

7. The display optical module according to claim 6, wherein: The light blocking layer is formed on a surface of the insulating layer away from the substrate.

8. The display optical module according to claim 7, characterized in that: The orthographic projection of the insulating layer on the mounting surface completely covers the orthographic projection of the light blocking layer on the mounting surface.

9. The display optical module according to claim 6, wherein: The light blocking layer is in direct contact with the mounting surface.

10. The display optical module according to claim 5, characterized in that: The insulating layer covers the driving circuit, and the light blocking layer is partially formed on a surface of the insulating layer away from the substrate, and partially directly contacts the mounting surface.

11. The display optical module according to any one of claims 5 to 10, characterized in that: The insulating layer is at least partially located within the air gap.

12. The display optical module according to any one of claims 5 to 10, characterized in that: The sum of the orthographic projections of the driving circuit, the insulating layer, and the light blocking layer on the mounting surface completely covers the orthographic projection of the light emitting element on the mounting surface.

13. The display optical module according to claim 1, wherein: The reflectivity of the light blocking layer to the infrared light is greater than or equal to 95%, and the absorptivity of the light blocking layer to the infrared light is less than or equal to 5%.

14. The display optical module according to claim 1, wherein: The light blocking layer includes gold, silver or copper.

15. The display optical module according to claim 1, wherein: The driving circuit includes a first circuit unit and a second circuit unit spaced apart from each other, and the light-emitting element includes a light-emitting material layer and a first electrode and a second electrode spaced apart and connected to the same side of the light-emitting material layer; The first electrode is electrically connected to the first circuit unit, and the second electrode is electrically connected to the second circuit unit, so that the light emitting material layer and the mounting surface are spaced apart from each other.

16. A display device, characterized in that: include: A micro display for emitting image light; The display optical module as described in any one of claims 1 to 15 is used to transmit ambient light and the image light to the human eye to display the image, and is used to receive the infrared light reflected by the human eye to track the line of sight of the human eye when observing the image.

17. A method for manufacturing a display optical module, characterized in that: include: Providing a substrate having a mounting surface; Depositing a driving circuit on the mounting surface; Depositing a light blocking layer on the mounting surface, wherein the light blocking layer is insulated from the driving circuit; as well as Soldering a light emitting element on a side of the driving circuit away from the mounting surface, so that the light blocking layer is located between the substrate and the light emitting element, and the orthographic projection of the light emitting element on the mounting surface and the orthographic projection of the light blocking layer on the mounting surface at least partially overlap; The driving circuit is used to drive the light-emitting element to emit infrared light, the light blocking layer is used to reflect the infrared light in a direction away from the substrate, and the infrared light is used to track the movement of human eyes.

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