Optical projection module and wearable electronic device

Abstract

An optical projection module and a wearable electronic device. The optical projection module comprises: an optical lens having a light entry end and a light exit end; a display panel arranged corresponding to the light entry end and comprising a light-emitting surface, a normal direction of the light-emitting surface not being parallel to an optical axis direction of the optical lens; and an optical path redirection element configured to acquire an initial light signal emitted from the light-emitting surface, and redirect the initial light signal to form a redirected light signal propagating toward the light exit end. The overall size of the optical projection module is reduced, which in turn improves the wearing comfort and the light weight of the wearable electronic device.

Description

Optical projection module and wearable electronic device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 5, 2024, with application number 202410251959.6 and invention name “Optical projection module and wearable electronic device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the technical field of optical display equipment, and in particular to an optical projection module. Background Art

[0003] Micro light emitting diodes (Micro LEDs) have important applications in many fields such as self-luminous microdisplays, visible light communications, and optogenetics.

[0004] Compared with microdisplays based on organic light emitting diodes (OLED) or liquid crystal displays (LCD), micro light emitting diodes have higher wall-plug efficiency, higher brightness, less efficiency drop, better thermal stability, longer life, faster response rate, higher resolution, higher color gamut and higher contrast.

[0005] With the rapid development of smart electronic devices, wearable electronics are becoming a key category in the future of consumer electronics, with smart glasses being a key product category. To improve the portability and wearing comfort of wearable electronics, micro-optical imaging modules based on micro-LEDs have become a key component in product development.

[0006] However, the size of existing optical projection modules based on micro-LEDs still needs to be further reduced.

[0007] Summary of the Invention

[0008] The problem solved by the present invention is to provide an optical projection module and a wearable electronic device, which can further reduce the size of the optical projection module and the wearable electronic device, improve wearing comfort and improve portability.

[0009] To solve the above-mentioned problems, the present invention provides an optical projection module, comprising: an optical lens having a light input end and a light output end; a display panel arranged corresponding to the light input end, comprising a light-emitting surface, wherein the normal direction of the light-emitting surface is not parallel to the optical axis direction of the optical lens; and a light path deflecting element, for obtaining an initial light signal emitted from the light-emitting surface, deflecting the initial light signal to form a deflected light signal propagating toward the light output end.

[0010] Optionally, the light path redirecting element includes a reflecting surface, and there is an angle between the reflecting surface and the normal of the light-emitting surface, and between the reflecting surface and the optical axis of the optical lens. The reflecting surface is used to redirect the initial light signal to form the redirected light signal transmitted to the light output end.

[0011] Optionally, the light path redirecting element is a prism, which includes a light incident surface, a light emitting surface and the reflecting surface that are interconnected. The light incident surface covers the light emitting surface of the display panel, and the light emitting surface corresponds to the light incident end of the optical lens. After the initial light signal enters the prism from the light incident surface, it is reflected by the reflecting surface to form the redirected light signal, and the redirected light signal is emitted from the light emitting surface.

[0012] Optionally, the maximum size of the prism in a direction parallel to the optical axis ranges from 3 mm to 8 mm; the maximum size of the prism in a direction perpendicular to the optical axis ranges from 3 mm to 8 mm.

[0013] Optionally, the distance between the light incident surface and the display panel is greater than 0.2 mm and less than 1 mm.

[0014] Optionally, the angle between the reflecting surface and the light incident surface is 44 degrees to 46 degrees; the angle between the reflecting surface and the light emitting surface is 44 degrees to 46 degrees.

[0015] Optionally, the light path redirecting element is a reflector, which includes the reflective surface, and the reflective surface, the light-emitting surface and the light incident end constitute a propagation space. After the initial light signal is reflected by the reflective surface, the redirected light signal is formed and directed toward the light incident end.

[0016] Optionally, the reflecting surface has a reflecting layer; the material of the reflecting layer includes organic oxides, and the organic oxides include silicon oxide, aluminum oxide, and titanium oxide; the thickness of the reflecting layer is less than 10 microns; the reflectivity of the reflecting layer is greater than 95%; the wavelength range of light reflected by the reflecting layer is 350 nanometers to 800 nanometers.

[0017] Optionally, the reflectivity of the reflecting surface is greater than 95%; the angle between the initial light signal and the normal of the reflecting surface is -50 degrees to +50 degrees, and the initial light signal is positive when it turns clockwise towards the normal of the reflecting surface and negative when it turns counterclockwise.

[0018] Optionally, the angle between the reflective surface and the optical axis of the optical lens is 44 degrees to 46 degrees.

[0019] Optionally, the optical lens includes a shell, and the shell has the light input end and the light output end.

[0020] Optionally, the display panel is located outside the housing.

[0021] Optionally, the light-emitting surface is at least partially fixed in the housing, and the light path redirecting element is at least partially located in the housing.

[0022] Optionally, the display panel further includes a circuit board, and the circuit board and the light-emitting surface are arranged in a direction parallel to the light-emitting surface.

[0023] Optionally, the circuit board and the optical lens are respectively located on both sides of the light-emitting surface in the direction of the optical axis; or, the circuit board and the optical lens are arranged in a direction perpendicular to the optical axis.

[0024] Optionally, the circuit board is a rigid circuit board or a flexible circuit board, or a combination of the two.

[0025] Optionally, the display panel further includes: a support plate and a light-emitting chip located on a surface of the support plate, wherein the light-emitting chip includes the light-emitting surface.

[0026] Optionally, the support plate has a first size in the optical axis direction of the optical lens, and the support plate has a second size in a second direction, the second direction is any direction perpendicular to the optical axis direction, and the first size is greater than or equal to the second size.

[0027] Optionally, the light-emitting chip is a liquid crystal display chip, a light-emitting diode chip or a laser chip.

[0028] Optionally, the light-emitting chip includes an organic light-emitting diode chip, a micro light-emitting diode chip or a mini light-emitting diode chip.

[0029] Optionally, the size of the light-emitting chip is 0.05 inches to 0.5 inches.

[0030] Optionally, the display panel is fixed to the light path redirecting element via a transparent adhesive layer, the light transmittance of the adhesive layer is greater than 99%, and the thickness of the adhesive layer ranges from 0.05 mm to 0.3 mm.

[0031] Optionally, the size of the optical lens along the optical axis is greater than 2 mm and less than 10 mm.

[0032] Correspondingly, an embodiment of the present invention further provides a wearable electronic device, comprising the optical projection module as described in any one of the above items.

[0033] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0034] In the optical projection module of the present invention, a light path redirecting element is provided to make the normal direction of the display panel's light-emitting surface non-parallel to the optical axis of the optical lens. The light path redirecting element then redirects the initial light signal emitted from the light-emitting surface to form a redirected light signal that propagates toward the light-emitting end. Because the normal direction of the display panel's light-emitting surface can be non-parallel to the optical axis of the optical lens, the placement of the display panel relative to the optical lens is more flexible, facilitating a reduction in the overall size of the optical projection module, thereby improving the wearing comfort and lightweightness of the wearable electronic device.

[0035] Furthermore, the support plate of the display panel has a first dimension in the direction of the optical axis of the optical lens, and a second dimension in a second direction, wherein the second direction is any direction perpendicular to the optical axis, and the first dimension is greater than or equal to the second dimension. Since the second dimension of the support plate is less than or equal to the first dimension in any direction perpendicular to the optical axis, this facilitates the overall size of the optical projection module in directions non-parallel to the optical axis, thereby reducing the overall size of the optical projection module. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] FIG1 is a schematic structural diagram of an embodiment of an optical projection module;

[0037] FIG2 is a schematic structural diagram of FIG1 along direction A;

[0038] FIG3 is a schematic structural diagram of an optical projection module according to an embodiment of the present invention;

[0039] FIG4 is a schematic structural diagram of FIG3 along the Y direction;

[0040] 5 is a schematic structural diagram of an optical projection module in which a light path redirecting element is a turning prism according to an embodiment of the present invention;

[0041] 6 is a schematic structural diagram of an optical projection module in which a light path redirecting element is a reflector according to an embodiment of the present invention;

[0042] 7 is a schematic structural diagram of an optical projection module according to an embodiment of the present invention, in which a circuit board and the optical lens are adjacent to each other and arranged in a direction perpendicular to the optical axis;

[0043] FIG8 is a schematic structural diagram of an optical projection module in which a light-emitting surface portion is fixed to the housing according to an embodiment of the present invention;

[0044] FIG9 is a schematic structural diagram of an optical projection module according to an embodiment of the present invention, in which all light-emitting surfaces are fixed to the housing. DETAILED DESCRIPTION

[0045] As described in the background art, the size of existing optical projection modules based on micro light emitting diodes still needs to be further reduced.

[0046] Please refer to Figures 1 and 2. Figure 1 is a structural schematic diagram of an embodiment of an optical projection module, and Figure 2 is a structural schematic diagram of Figure 1 along direction A, including: an optical lens 100 having a light input end 101 and a light output end 102; a display panel arranged corresponding to the light input end 101, the display panel including a light-emitting chip (not shown) and a support plate and a circuit board 104 fixedly mounted to the light-emitting chip 103, the light-emitting chip 103 having a light-emitting surface 105, and the normal direction of the light-emitting surface 105 is parallel to the optical axis direction B of the optical lens 100.

[0047] In this embodiment, light emitted from the light-emitting surface 105 enters the optical lens 100 from the light-incident end 101, is transmitted along the optical axis, and is emitted from the light-emitting end 102. However, because the support plate 103 of the display panel has a large dimension H1 perpendicular to the optical axis direction B, the overall size of the optical projection module is relatively large.

[0048] To address the above-mentioned problems, the present invention provides an optical projection module. By disposing a light path deflection element between a display panel and an optical lens, the normal direction of the light-emitting surface of the display panel is made non-parallel to the optical axis direction of the optical lens. This makes the arrangement of the display panel relative to the optical lens more flexible, which is conducive to reducing the overall size of the optical projection module, thereby improving the wearing comfort and lightweightness of the wearable electronic device.

[0049] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0050] Figures 3 and 4 are schematic structural diagrams of an optical projection module according to an embodiment of the present invention. Figure 4 is a schematic structural diagram of Figure 3 along the Y direction, comprising: an optical lens 200 having a light input end 201 and a light output end 202; a display panel 300 arranged corresponding to the light input end 201, comprising a light-emitting surface 301, wherein the normal Z direction of the light-emitting surface 301 is not parallel to the optical axis X direction of the optical lens 200; and a light path steering element 400, for obtaining an initial light signal L0 emitted from the light-emitting surface 301, steering the initial light signal L0 to form a steering light signal L1 that propagates toward the light output end 202.

[0051] The following is a detailed description with reference to the accompanying drawings.

[0052] The display panel 300 includes a support plate 304 and a light emitting chip 303 located on a surface of the support plate 304 . The light emitting chip 303 includes the light emitting surface 301 .

[0053] The light-emitting chip 303 is a liquid crystal display (LCD) chip, a light-emitting diode (LED) chip, or a laser chip. The light-emitting diode chip includes an organic light-emitting diode (OLED) chip, a micro light-emitting diode (Micro LED) chip, or a mini light-emitting diode (Mini LED) chip. The size of the light-emitting chip 303 is 0.05 inches to 0.5 inches.

[0054] The display panel 300 further includes a circuit board 302 . The circuit board 302 and the light-emitting surface 301 are arranged in a direction parallel to the light-emitting surface 301 .

[0055] The circuit board 302 is a rigid circuit board or a flexible circuit board, or a combination of the two.

[0056] The support plate 304 has a first size H1 in the optical axis X direction of the optical lens 200 and a second size in a second direction. The second direction is any direction perpendicular to the optical axis X direction. The first size H1 is greater than or equal to the second size.

[0057] The second direction has a preset angle with the optical axis X direction; in some embodiments, the preset angle ranges from 85° to 95°.

[0058] In this embodiment, the second direction is perpendicular to the optical axis X direction; the second dimension of the support plate 304 of the display panel 300 includes the first component dimension H 21 and the second component size H 22 , the first component size H 21is the size of the support plate 304 of the display panel 300 in a direction parallel to the normal of the light emitting surface 301 and perpendicular to the optical axis X. The second component H 22 The size is the size of the support plate 304 of the display panel 300 in a direction perpendicular to the normal of the light emitting surface 301 and perpendicular to the optical axis X.

[0059] Since the second dimension of the support plate 304 of the display panel 300 is less than or equal to the first dimension H1 in any direction non-parallel to the optical axis X, after the display panel 300 and the optical lens 200 are assembled, the resulting optical projection module has a smaller dimension in any direction non-parallel to the optical axis X. Therefore, the overall size of the optical projection module is reduced, which is beneficial for improving the wearing comfort and lightweightness of the wearable electronic device formed by the optical projection module.

[0060] The optical path redirecting element 400 includes a reflective surface 401. An included angle is formed between the reflective surface 401 and the normal to the light-emitting surface 301, as well as the optical axis X of the optical lens 200. The reflective surface 401 is used to redirect the initial light signal L0 to form a redirected light signal L1 that is transmitted to the light output end 202. The reflectivity of the reflective surface 401 is greater than 95%. The included angle between the initial light signal L0 and the normal to the reflective surface 401 is between -50 degrees and +50 degrees, with the normal to the reflective surface 401 being positive in a clockwise direction and negative in a counterclockwise direction. The included angle between the reflective surface 401 and the optical axis X of the optical lens 200 is between 44 degrees and 46 degrees.

[0061] In some embodiments, the transmission direction of the steering light signal L1 and the optical axis X direction of the optical lens 200 have an angle smaller than 90°.

[0062] In this embodiment, the normal Z of the light-emitting surface 301 is perpendicular to the optical axis X. The initial light signal L0 emitted by the light-emitting surface 301 propagates in a direction perpendicular to the optical axis X, and after being incident on the reflective surface 401, is deflected by the reflective surface 401 into a deflected light signal L1 propagating in a direction parallel to the optical axis X. The deflected light signal L1 enters the optical lens 200 from the light input end 201 and is then emitted from the light output end 202.

[0063] In other embodiments, the normal Z direction of the light emitting surface may also have an obtuse angle or an acute angle with the optical axis direction.

[0064] In some embodiments, the light path redirecting element 400 is a prism, which includes a light incident surface 410 (as shown in Figure 3), a light emitting surface 420 (as shown in Figure 3) and the reflecting surface 401 that are interconnected. The light incident surface 410 covers the light emitting surface 301 of the display panel 300, and the light emitting surface 420 corresponds to the light incident end 201 of the optical lens 200. After the initial light signal L0 enters the prism from the light incident surface 410, it is reflected by the reflecting surface 401 to form the redirected light signal L1, and the redirected light signal L1 is emitted from the light emitting surface 420.

[0065] In some embodiments, the display panel 300 is fixed to the light path redirecting element 200 via a transparent adhesive layer, the light transmittance of the adhesive layer is greater than 99%, and the thickness of the adhesive layer ranges from 0.05 mm to 0.3 mm.

[0066] In one embodiment, the maximum dimension of the prism in a direction parallel to the optical axis X ranges from 3 mm to 8 mm; the maximum dimension of the prism in a direction perpendicular to the optical axis X ranges from 3 mm to 8 mm. The distance between the light incident surface 410 and the display panel 300 is greater than 0.2 mm and less than 1 mm. The angle between the reflective surface 401 and the light incident surface 410 is between 44 and 46 degrees; the angle between the reflective surface 401 and the light emitting surface 420 is between 44 and 46 degrees.

[0067] In this embodiment, referring to FIG3 , the light path redirecting element 400 is a right-angle prism. The angles formed between the reflective surface 401 of the right-angle prism and the light incident surface 410 or the light exit surface 420 of the prism are both acute, while the angles formed between the light incident surface 410 and the light exit surface 420 are right angles. The reflective surface 401 of the right-angle prism has a reflective layer. In some embodiments, the reflective layer comprises an organic oxide, such as silicon oxide, aluminum oxide, or titanium oxide. The thickness of the reflective layer is less than 10 microns, the reflectivity of the reflective layer is greater than 95%, and the wavelength of light reflected by the reflective layer is in the range of 350 nanometers to 800 nanometers.

[0068] In another embodiment, referring to FIG5 , the light path redirecting element 400 is a turning prism. The turning prism comprises two right-angle prisms, each of which includes an inclined surface and two right-angled surfaces. The angles between the inclined surface and the two right-angled surfaces are acute, and the angle between the two right-angled surfaces is a right angle. The two inclined surfaces of the two right-angled prisms are fixed together to form the reflective surface 401. The right-angled surface adjacent to the light-emitting surface 301 is the light incident surface, and the right-angled surface adjacent to the optical lens 200 is the light exit surface. The fixed right-angle prisms can protect the reflective surface 401, preventing it from falling off during use.

[0069] In other embodiments, please refer to Figure 6, the optical path redirecting element 400 is a reflector, and the reflector includes the reflective surface 401, and the reflective surface 401, the light-emitting surface 301 and the light incident end 201 constitute a propagation space. After the initial light signal L0 is reflected by the reflective surface 401, the redirected light signal L1 is formed and directed toward the light incident end 201.

[0070] The reflective surface 401 of the reflector has a reflective layer; in some embodiments, the material of the reflective layer includes organic oxides, and the organic oxides include silicon oxide, aluminum oxide, and titanium oxide; the thickness of the reflective layer is less than 10 microns; the reflectivity of the reflective layer is greater than 95%; the wavelength range of light reflected by the reflective layer is 350 nanometers to 800 nanometers.

[0071] In this embodiment, please continue to refer to FIG. 3 , the circuit board 302 and the optical lens 200 are respectively located on both sides of the light-emitting surface 301 in the direction of the optical axis X.

[0072] In some other embodiments, referring to FIG. 7 , the circuit board 502 and the optical lens 200 are adjacent to each other and arranged along a direction perpendicular to the optical axis X.

[0073] In some embodiments, the optical lens 200 includes a housing 203, wherein the housing 203 has the light input end 201 and the light output end 202. The dimension of the optical lens 200 along the optical axis X direction is greater than 2 mm and less than 10 mm.

[0074] In this embodiment, referring again to FIG. 3 , the display panel 300 is completely located outside the housing 203 and is disposed in contact with the housing 203. The light input end 201 and the light output end 202 are disposed opposite each other. The light output surface 420 of the light path redirecting element 400 is fixed to the light input end 201 of the optical lens 200, and the light input surface 410 of the light path redirecting element 400 is fixed to the display panel 300. The light emitting surface 301 of the display panel 300 is attached to the light input surface 410. After the initial light signal L0 emitted by the light emitting surface 301 enters the light path redirecting element 400 and is reflected by the reflective surface 401, it forms a redirected light signal L1, which is emitted from the light output surface and enters the light input end 201 of the optical lens 200.

[0075] In some other embodiments, the display panel 300 is completely located outside the housing 203 , the support plate 304 is disposed in a non-contact manner with the housing 203 , and the light emitting chip 303 is disposed in a non-contact manner with the housing.

[0076] In other embodiments, referring to FIG8 , the light-emitting surface 301 is partially fixed to the housing 203, and the light-path redirecting element 400 is at least partially located within the housing 203. In this embodiment, the light-path redirecting element 400 is partially located within the housing 203. In other embodiments, the light-path redirecting element 400 is entirely located within the housing 203.

[0077] Specifically, the light emitting chip 303 has a first light emitting portion and a second light emitting portion. The first light emitting portion is fixed to a side wall of the housing 203 parallel to the optical axis X direction, and the second light emitting portion is located outside the housing 203 .

[0078] The light input end 201 includes a first light input portion 2011 and a second light input portion 2012 connected to each other; the first light input portion 2011 is located on the side wall of the shell 203 parallel to the direction of the optical axis X, and the first light input portion 2011 is arranged corresponding to the first light-emitting portion; the second light input portion 2012 is arranged opposite to the light output end 202.

[0079] The light emitting surface of the light path deflection element 400 is fixed in the housing 203. The reflective surface 401 of the light path deflection element 400 has a first reflective surface and a second reflective surface. The first reflective surface is provided in the housing 203 for reflecting the initial light signal L from the first light emitting portion. 02 The second reflective surface is provided outside the housing 203 for reflecting the initial light signal L from the second light emitting portion 01 .

[0080] The light incident surface of the light path redirecting element 400 includes a first light incident surface and a second light incident surface; the first light incident surface is disposed in the housing 203 for receiving the initial light signal L from the first light emitting portion. 02 The second light incident surface is provided outside the housing 203 for receiving the initial light signal L from the second light emitting portion 01 .

[0081] The initial light signal L emitted by the first light emitting portion of the light emitting chip 303 is 02 The light enters the optical lens 200 from the first light incident portion, propagates through the first light incident surface to the first reflection surface, and is reflected to form a turning light signal L 12 The initial light signal L emitted by the second light emitting portion of the light emitting chip 303 is transmitted toward the light emitting end 202 and emitted from the light emitting end 202; 01 The light enters the light path redirecting element 400 from the second light incident surface and is reflected by the second reflective surface to form a redirected light signal L 11 , and propagates toward the second light incident portion, the steering light signal L 11 The light enters the optical lens 200 from the second light incident portion and is emitted from the light emitting end 202 .

[0082] In some other embodiments, referring to FIG. 9 , the light emitting surface 301 is entirely fixed to the housing 203 , and the light path redirecting element 400 is entirely located within the housing 203 .

[0083] The light input end 201 of the optical lens 200 is located on a sidewall of the housing 203 parallel to the optical axis X. The light input end 201 is positioned corresponding to the light-emitting surface 301. The light path redirecting element 400 is disposed within the housing 203 and corresponding to the light-emitting surface 301. The light input surface of the light path redirecting element 400 is fixed to the sidewall of the housing 203 and corresponds to the light input end 201. The light output surface is fixed within the housing 203 and faces the light output end 202. The reflective surface 401 faces the side of the housing 203 opposite the light output end 202 and is fixed within the housing 203. The light-emitting chip 303 is fixed to the light input end 201. The initial light signal L0 emitted by the light-emitting surface 301 enters the light input surface of the optical lens 200 from the light input end 201. After reflection by the reflective surface 401, the initial light signal L1 is generated and emitted from the light output surface toward the light output end 202, and then emitted from the light output end 202.

[0084] In summary, in this embodiment, by disposing a light path redirecting element between the display panel and the optical lens, the normal direction of the display panel's light-emitting surface can be made non-parallel to the optical axis direction of the optical lens. Consequently, the light path redirecting element redirects the initial light signal emitted from the light-emitting surface to form a redirected light signal that propagates toward the light-emitting end, and the transmission direction of the redirected light signal forms an angle of less than 90° with the optical axis X direction of the optical lens. Because the normal direction of the display panel's light-emitting surface can be non-parallel to the optical axis direction of the optical lens, the placement of the display panel relative to the optical lens is more flexible, which helps reduce the overall size of the optical projection module, thereby improving the wearing comfort and lightweightness of the wearable electronic device.

[0085] Correspondingly, an embodiment of the present invention further provides a wearable electronic device, wherein the wearable electronic device includes a wearable electronic device including an optical projection module as shown in FIG. 3 to FIG. 9 .

[0086] In some embodiments, the wearable electronic device is a pair of smart glasses. The smart glasses include a pair of glasses and the aforementioned optical projection module disposed within the pair of glasses. Since the temples of smart glasses are elongated, the optical projection module in the technical solution of this application is reduced in size in a direction non-parallel to the optical axis of the optical lens, thereby better adapting to the structure of the smart glasses. Accordingly, the size of the temples is reduced due to the size of the glasses.

[0087] In other embodiments, the wearable electronic device can also be other wearable electronic devices, and the wearable electronic device includes a housing and an optical projection module disposed in the housing.

[0088] The display panel mentioned above is a micro display panel.

[0089] The micro display panel described above has a very small volume, with length and width dimensions ranging from 500μm to 50,000μm. The area of ​​the light-emitting region of the micro display panel is very small, such as 1mm×1mm, 2.64mm×2.02mm, 3mm×5mm, etc. The light-emitting region of the micro display panel includes a plurality of micro LED pixels arranged in an array, and the specific pixel arrangement can be one of 320×240, 640×480, 1600×1200, 1920×1080, and 2560×1440. The size of a single micro LED pixel is between 100nm and 100μm. In some embodiments, the size of a single micro LED pixel is between 150nm and 15μm. In some embodiments, the size of a single micro LED pixel can also be less than 10μm.

[0090] A driver backplane is located behind the micro-LED pixel array. It is electrically connected to the micro-LEDs within the array and receives signals such as image data from the outside world, controlling the corresponding micro-LEDs to illuminate or not illuminate. The driver backplane is typically a TFT (Thin Film Transistor) board or an IC (Integrated Circuit) board.

[0091] For example, the driving backplane of the above-mentioned micro display panel integrates a frame buffer, a column driving circuit, and a row driving circuit. The frame buffer includes a first pixel storage area, and the micro LED pixel array includes a second pixel storage area. A complete frame of pixel grayscale data from the outside world can first enter the first pixel storage area of ​​the frame buffer. The column driving circuit can load the pixel grayscale data in the first pixel storage area of ​​the frame buffer into the second pixel storage area of ​​the micro LED pixel array. The row driving circuit can scan the pixel grayscale data in the second pixel storage area and generate a pulse modulation signal to achieve the purpose of displaying different grayscales. When driving multiple micro LED pixels in the micro LED pixel array, either a single pixel can be driven independently or multiple pixel units can be driven independently. The specific driving method should not constitute a limitation to the present invention.

[0092] It should be noted that the application of the above-mentioned micro display panel in the present invention should not constitute a limitation on the application of the present invention.

[0093] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. An optical projection module, characterized in that: include: An optical lens having a light input end and a light output end; A display panel arranged corresponding to the light incident end includes a light emitting surface, wherein a normal direction of the light emitting surface is not parallel to an optical axis direction of the optical lens; The optical path steering element is used to obtain an initial optical signal emitted from the light-emitting surface, and to steering the initial optical signal to form a steering optical signal that propagates toward the light-emitting end.

2. The optical projection module according to claim 1, wherein: The light path redirecting element includes a reflecting surface, and there is an angle between the reflecting surface and the normal of the light-emitting surface, and between the reflecting surface and the optical axis of the optical lens. The reflecting surface is used to redirect the initial light signal to form the redirected light signal transmitted to the light output end.

3. The optical projection module according to claim 2, wherein: The light path redirecting element is a prism, which includes a light incident surface, a light emitting surface and the reflecting surface that are interconnected. The light incident surface covers the light emitting surface of the display panel, and the light emitting surface corresponds to the light incident end of the optical lens. After the initial light signal enters the prism from the light incident surface, it is reflected by the reflecting surface to form the redirected light signal, and the redirected light signal is emitted from the light emitting surface.

4. The optical projection module according to claim 3, wherein: The maximum size of the prism in a direction parallel to the optical axis ranges from 3 mm to 8 mm; the maximum size of the prism in a direction perpendicular to the optical axis ranges from 3 mm to 8 mm.

5. The optical projection module according to claim 3, wherein: The distance between the light incident surface and the display panel is greater than 0.2 mm and less than 1 mm.

6. The optical projection module according to claim 3, wherein: The included angle between the reflecting surface and the light incident surface is 44 degrees to 46 degrees; the included angle between the reflecting surface and the light emitting surface is 44 degrees to 46 degrees.

7. The optical projection module according to claim 2, wherein: The light path redirecting element is a reflector, which includes the reflective surface, and the reflective surface, the light-emitting surface and the light incident end constitute a propagation space. After the initial light signal is reflected by the reflective surface, it forms the redirected light signal directed toward the light incident end.

8. The optical projection module according to claim 2, wherein: The reflecting surface has a reflecting layer; the material of the reflecting layer includes organic oxides, and the organic oxides include silicon oxide, aluminum oxide, and titanium oxide; the thickness of the reflecting layer is less than 10 microns; the reflectivity of the reflecting layer is greater than 95%; the wavelength range of light reflected by the reflecting layer is 350 nanometers to 800 nanometers.

9. The optical projection module according to claim 2, wherein: The reflectivity of the reflecting surface is greater than 95%; the angle between the initial light signal and the normal of the reflecting surface is -50 degrees to +50 degrees, and the initial light signal is positive when it turns clockwise toward the normal of the reflecting surface and negative when it turns counterclockwise.

10. The optical projection module according to claim 2, wherein: The angle between the reflective surface and the optical axis of the optical lens is 44 degrees to 46 degrees.

11. The optical projection module according to claim 2, wherein: The display panel is fixed to the light path redirecting element via a transparent adhesive layer. The light transmittance of the adhesive layer is greater than 99%, and the thickness of the adhesive layer ranges from 0.05 mm to 0.3 mm.

12. The optical projection module according to claim 1, wherein: The optical lens comprises a housing having the light input end and the light output end.

13. The optical projection module according to claim 12, wherein: The display panel is located outside the housing.

14. The optical projection module according to claim 12, wherein: The light emitting surface is at least partially fixed in the housing, and the light path redirecting element is at least partially located in the housing.

15. The optical projection module according to claim 1, wherein: The display panel further includes a circuit board, and the circuit board and the light-emitting surface are arranged in a direction parallel to the light-emitting surface.

16. The optical projection module according to claim 15, wherein: The circuit board and the optical lens are respectively located on both sides of the light-emitting surface in the direction of the optical axis; or, the circuit board and the optical lens are arranged in a direction perpendicular to the optical axis.

17. The optical projection module according to claim 15, wherein: The circuit board is a rigid circuit board or a flexible circuit board, or a combination of the two.

18. The optical projection module according to claim 1, wherein: The display panel further includes: a support plate and a light-emitting chip located on a surface of the support plate, wherein the light-emitting chip includes the light-emitting surface.

19. The optical projection module according to claim 18, wherein: The support plate has a first size in the optical axis direction of the optical lens, and a second size in a second direction, where the second direction is any direction perpendicular to the optical axis direction, and the first size is greater than or equal to the second size.

20. The optical projection module according to claim 18, wherein: The light emitting chip is a liquid crystal display chip, a light emitting diode chip or a laser chip.

21. The optical projection module according to claim 18, wherein: The light emitting chip includes an organic light emitting diode chip, a micro light emitting diode chip or a mini light emitting diode chip.

22. The optical projection module according to claim 18, wherein: The size of the light emitting chip is 0.05 inch to 0.5 inch.

23. The optical projection module according to claim 1, wherein: The size of the optical lens along the optical axis is greater than 2 mm and less than 10 mm.

24. A wearable electronic device, characterized in that: The optical projection module comprises the optical projection module according to any one of claims 1 to 23.

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