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 an entrance end and an exit end; a display panel corresponding to the entrance end and comprising a light emitting surface, a normal direction of the light emitting surface being non-parallel to an optical axis direction of the optical lens; and a light path turning element configured to obtain an initial light signal emitted from the light emitting surface and to form a turned light signal propagating towards the exit end by turning the initial light signal. The overall size of the optical projection module is reduced, thereby improving the wearing comfort and lightness of the wearable electronic device.

Description

Technical Field

[0001] This invention relates to the field of optical display equipment technology, and more particularly to an optical projection module. Background Technology

[0002] Micro light-emitting diodes (Micro LEDs) have important applications in many fields, including self-emissive microdisplays, visible light communication, and optogenetics.

[0003] Compared to microdisplays based on organic light-emitting diodes (OLEDs) or liquid crystal displays (LCDs), microlight-emitting diodes have higher wall-plug efficiency, higher brightness, less efficiency degradation, better thermal stability, longer lifespan, faster response rate, higher resolution, wider color gamut, and higher contrast.

[0004] With the rapid development of smart electronic devices, wearable electronic products have become an important category in the future consumer electronics field, with smart glasses being a key product category within this field. To improve the portability and comfort of wearable electronic products, micro-optical imaging modules based on miniature light-emitting diodes (LEDs) have become a crucial component in product development.

[0005] However, the size of existing optical projection modules based on miniature light-emitting diodes still needs to be further reduced. Summary of the Invention

[0006] The problem solved by this invention is to provide an optical projection module and a wearable electronic device that can further reduce the size of the optical projection module and the wearable electronic device, improve wearing comfort, and improve portability.

[0007] To address the aforementioned problems, the present invention provides an optical projection module, comprising: an optical lens having an incident light end and an exit light end; a display panel corresponding to the incident light end, including 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 steering element for acquiring an initial light signal emitted from the light-emitting surface and steering the initial light signal to form a steering light signal propagating toward the exit light end.

[0008] Optionally, the optical path steering element includes a reflective surface, with an angle between the reflective surface and the normal of the emitting surface, and between the reflective surface and the optical axis of the optical lens. The reflective surface is used to deflect the initial optical signal to form the steering optical signal transmitted to the light-emitting end.

[0009] Optionally, the light path steering element is a prism, which includes an incident light surface, an exit light surface, and a reflective surface that are connected to each other. The incident light surface covers the light-emitting surface of the display panel, and the exit light surface corresponds to the incident light end of the optical lens. After the initial light signal enters the prism from the incident light surface, it is reflected by the reflective surface to form the steering light signal, and the steering light signal is emitted from the exit light surface.

[0010] Optionally, the maximum size range of the prism in the direction parallel to the optical axis is 3 mm to 8 mm; the maximum size range of the prism in the direction perpendicular to the optical axis is 3 mm to 8 mm.

[0011] Optionally, the distance between the light-incident surface and the display panel is greater than 0.2 mm and less than 1 mm.

[0012] Optionally, the angle between the reflecting surface and the incident light surface is 44 to 46 degrees; the angle between the reflecting surface and the emitting light surface is 44 to 46 degrees.

[0013] Optionally, the optical path steering element is a reflector, the reflector includes the reflective surface, and the reflective surface, the light-emitting surface and the light-incident end constitute a propagation space. After the initial optical signal is reflected by the reflective surface, it forms the steering optical signal directed toward the light-incident end.

[0014] Optionally, the reflective surface has a reflective layer; the material of the reflective layer includes organic oxides, such as silicon oxide, aluminum oxide, and titanium oxide; the thickness of the reflective layer is less than 10 micrometers; the reflectivity of the reflective layer is greater than 95%; and the wavelength range of the light reflected by the reflective layer is from 350 nanometers to 800 nanometers.

[0015] Optionally, the reflectivity of the reflective surface is greater than 95%; the angle between the initial light signal and the normal of the reflective surface is between -50 degrees and +50 degrees, and the initial light signal is positive when it turns clockwise and negative when it turns counterclockwise towards the normal of the reflective surface.

[0016] Optionally, the angle between the reflective surface and the optical axis of the optical lens is 44 to 46 degrees.

[0017] Optionally, the optical lens includes a housing having the light-incident end and the light-outcident end.

[0018] Optionally, the display panel is located outside the housing.

[0019] Optionally, the light-emitting surface is at least partially fixed within the housing, and the light path steering element is at least partially located within the housing.

[0020] Optionally, the display panel further includes a circuit board, which is disposed along a direction parallel to the light-emitting surface.

[0021] Optionally, the circuit board and the optical lens are located on opposite sides of the light-emitting surface in the optical axis direction; or, the circuit board and the optical lens are arranged in a direction perpendicular to the optical axis.

[0022] Optionally, the circuit board is one or a combination of rigid circuit boards and flexible circuit boards.

[0023] Optionally, the display panel further includes a support plate and a light-emitting chip located on the surface of the support plate, the light-emitting chip including the light-emitting surface.

[0024] Optionally, the support plate has a first dimension in the optical axis direction of the optical lens, and the support plate has a second dimension in a second direction, the second direction being any direction perpendicular to the optical axis direction, and the first dimension being greater than or equal to the second dimension.

[0025] Optionally, the light-emitting chip is a liquid crystal display chip, a light-emitting diode chip, or a laser chip.

[0026] 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.

[0027] Optionally, the size of the light-emitting chip is 0.05 inches to 0.5 inches.

[0028] Optionally, the display panel is fixed to the light path steering element by 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.

[0029] Optionally, the optical lens has a dimension greater than 2 mm and less than 10 mm along the optical axis.

[0030] Accordingly, embodiments of the present invention also provide a wearable electronic device, including an optical projection module as described in any of the preceding claims.

[0031] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0032] In the optical projection module of this invention, by setting a light path steering element, the normal direction of the emitting surface of the display panel can be made non-parallel to the optical axis direction of the optical lens. This allows the initial light signal emitted from the emitting surface to be redirected by the light path steering element, forming a redirected light signal propagating towards the light-emitting end. Because the normal direction of the emitting surface of the display panel can be non-parallel to the optical axis direction of the optical lens, the arrangement of the display panel relative to the optical lens becomes more flexible, which helps to reduce the overall size of the optical projection module, thereby improving the wearing comfort and weight reduction of wearable electronic devices.

[0033] Furthermore, the support plate of the display panel has a first dimension in the optical axis direction of the optical lens, and a second dimension in a second direction, which can be any direction perpendicular to the optical axis direction. 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 direction, this is beneficial for reducing the overall size of the optical projection module in directions not parallel to the optical axis, thus enabling a reduction in the overall size of the optical projection module. Attached Figure Description

[0034] Figure 1 This is a structural schematic diagram of an embodiment of an optical projection module;

[0035] Figure 2 yes Figure 1 Schematic diagram of the structure along direction A;

[0036] Figure 3 This is a schematic diagram of the structure of an optical projection module according to an embodiment of the present invention;

[0037] Figure 4 yes Figure 3 Schematic diagram of the structure along the Y direction;

[0038] Figure 5 This is a schematic diagram of an optical projection module in an embodiment of the present invention, in which the optical path steering element is a deflection prism;

[0039] Figure 6 This is a schematic diagram of an optical projection module in an embodiment of the present invention, in which the optical path steering element is a reflector.

[0040] Figure 7 This is a schematic diagram of the structure of an optical projection module according to an embodiment of the present invention, in which the circuit board and the optical lens are adjacent and arranged along a direction perpendicular to the optical axis;

[0041] Figure 8 This is a schematic diagram of the structure in an optical projection module of the present invention, in which the light-emitting surface is fixed to the housing;

[0042] Figure 9 This is a schematic diagram of an optical projection module according to an embodiment of the present invention, in which the light-emitting surface is completely fixed to the housing. Detailed Implementation

[0043] As described in the background section, the size of existing optical projection modules based on miniature light-emitting diodes still needs to be further reduced.

[0044] Please refer to Figure 1 and Figure 2 , Figure 1 This is a structural schematic diagram of an embodiment of an optical projection module. Figure 2 yes Figure 1 A schematic diagram along direction A includes: an optical lens 100 having an incident light end 101 and an exit light end 102; a display panel corresponding to the incident light end 101, the display panel including a light-emitting chip (not shown), a support plate, and a circuit board 104 fixedly disposed with the light-emitting chip 103, the light-emitting chip 103 having a light-emitting surface 105, the normal direction of the light-emitting surface 105 being parallel to the optical axis direction B of the optical lens 100.

[0045] In this embodiment, light emitted from the light-emitting surface 105 enters the optical lens 100 from the light-incident end 101 and is transmitted along the optical axis to be emitted from the light-exit end 102. However, because the support plate 103 of the display panel has a large dimension H1 in the direction perpendicular to the optical axis B, the overall size of the optical projection module is relatively large.

[0046] To address the aforementioned issues, this invention provides an optical projection module. By setting a light path steering element between the display panel and the 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 allows for more flexible placement of the display panel relative to the optical lens, which in turn helps to reduce the overall size of the optical projection module, thereby improving the wearing comfort and weight reduction of wearable electronic devices.

[0047] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0048] Figure 3 and Figure 4 This is a schematic diagram of the structure of an optical projection module according to an embodiment of the present invention. Figure 4 yes Figure 3A schematic diagram along the Y direction includes: an optical lens 200 having an incident light end 201 and an exit light end 202; a display panel 300 corresponding to the incident light end 201, including 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 acquiring an initial light signal L0 emitted from the light-emitting surface 301, and for steering the initial light signal L0 to form a steering light signal L1 that propagates toward the exit light end 202.

[0049] The following will be described in detail with reference to the accompanying drawings.

[0050] The display panel 300 includes a support plate 304 and a light-emitting chip 303 located on the surface of the support plate 304, wherein the light-emitting chip 303 includes the light-emitting surface 301.

[0051] The light-emitting chip 303 is a liquid crystal display (LCD) chip, a light-emitting diode (LED) chip, or a laser chip. The LED chip includes an organic light-emitting diode (OLED) chip, a micro LED chip, or a mini LED chip. The size of the light-emitting chip 303 is 0.05 inches to 0.5 inches.

[0052] The display panel 300 also includes a circuit board 302, which is arranged with the light-emitting surface 301 in a direction parallel to the light-emitting surface 301.

[0053] The circuit board 302 is one or a combination of rigid circuit boards and flexible circuit boards.

[0054] The support plate 304 has a first dimension H1 in the optical axis X direction of the optical lens 200, and the support plate 304 has a second dimension in a second direction, the second direction being any direction perpendicular to the optical axis X direction, and the first dimension H1 is greater than or equal to the second dimension.

[0055] The second direction has a preset angle with the optical axis X direction; in some embodiments, the preset angle ranges from 85° to 95°.

[0056] 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 Second component size H 22 The first component size H 21 The second component H is the dimension of the support plate 304 of the display panel 300 in the direction parallel to the normal of the light-emitting surface 301 and perpendicular to the optical axis X. 22The dimension is the dimension of the support plate 304 of the display panel 300 in the direction perpendicular to the normal of the light-emitting surface 301 and in the direction perpendicular to the optical axis X.

[0057] 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 not parallel to the optical axis X, the optical projection module formed after the display panel 300 and the optical lens 200 are assembled together has a smaller size in any direction not parallel to the optical axis X. Therefore, the overall size of the optical projection module is reduced, which is beneficial to improving the wearing comfort and weight reduction of the wearable electronic device composed of the optical projection module.

[0058] The optical path steering element 400 includes a reflective surface 401. The reflective surface 401 has angles with the normal of the emitting surface 301 and with the optical axis X of the optical lens 200. The reflective surface 401 is used to deflect the initial optical signal L0, forming a steering optical signal L1 transmitted to the light-emitting end 202. The reflectivity of the reflective surface 401 is greater than 95%. The angle between the initial optical signal L0 and the normal of the reflective surface 401 is -50 degrees to +50 degrees. Clockwise rotation of the initial optical signal L0 towards the normal of the reflective surface 401 is positive, and counterclockwise rotation is negative. The angle between the reflective surface 401 and the optical axis X of the optical lens 200 is 44 degrees to 46 degrees.

[0059] In some embodiments, the transmission direction of the steering light signal L1 has an angle of less than 90° with the optical axis X direction of the optical lens 200.

[0060] 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, it is diverted by the reflective surface 401 into a diverted light signal L1 that propagates parallel to the optical axis X. The diverted light signal L1 enters the optical lens 200 from the light-incident end 201 and is emitted from the light-exit end 202.

[0061] In other embodiments, the Z-direction of the luminescent surface may also have an obtuse or acute angle with the optical axis direction.

[0062] In some embodiments, the light path steering element 400 is a prism, the prism including interconnected light incident surfaces 410 (e.g., ...). Figure 3 As shown), light-emitting surface 420 (e.g.) Figure 3As shown in the diagram, 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 reflective surface 401 to form the turning light signal L1, which is emitted from the light-emitting surface 420.

[0063] In some embodiments, the display panel 300 is fixed to the light path steering element 200 by a transparent adhesive layer, the light transmittance of the adhesive layer being greater than 99%, and the thickness of the adhesive layer ranging from 0.05 mm to 0.3 mm.

[0064] In one embodiment, the maximum size range of the prism in the direction parallel to the optical axis X is 3 mm to 8 mm; the maximum size range of the prism in the direction perpendicular to the optical axis X is 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 44 degrees to 46 degrees; the angle between the reflective surface 401 and the light-emitting surface 420 is 44 degrees to 46 degrees.

[0065] In this embodiment, please refer to Figure 3 The light path steering element 400 is a right-angle prism; the angle between the reflecting surface 401 of the right-angle prism and the incident surface 410 or the emitting surface 420 of the prism is an acute angle, while the angle between the incident surface 410 and the emitting surface 420 is a right angle. The reflecting surface 401 of the right-angle prism has a reflective layer; in some embodiments, the material of the reflective layer includes organic oxides, such as silicon oxide, aluminum oxide, and titanium oxide; the thickness of the reflective layer is less than 10 micrometers; the reflectivity of the reflective layer is greater than 95%; and the wavelength range of the light reflected by the reflective layer is from 350 nanometers to 800 nanometers.

[0066] In another embodiment, please refer to Figure 5 The optical path steering element 400 is a deflection prism; the deflection prism includes two right-angle prisms, each of which includes an inclined plane and two right-angled surfaces. The angle between the inclined plane and the two right-angled surfaces is an acute angle, and the angle between the two right-angled surfaces is a right angle. The two inclined planes of the two right-angle prisms are fixed to each other to form the reflecting surface 401. The right-angled surface adjacent to the emitting surface 301 is the light-incident surface; the right-angled surface adjacent to the optical lens 200 is the light-emitting surface. The mutually fixed right-angle prisms can protect the reflecting surface 401 and prevent problems such as detachment of the reflecting surface 401 during use.

[0067] In other embodiments, please refer to Figure 6The optical path steering element 400 is a reflector, which includes a reflective surface 401. The reflective surface 401, the light-emitting surface 301, and the light-incident end 201 constitute a propagation space. The initial optical signal L0 is reflected by the reflective surface 401 to form the steering optical signal L1 directed toward the light-incident end 201.

[0068] The reflective surface 401 of the reflector has a reflective layer; in some embodiments, the material of the reflective layer includes organic oxides, such as silicon oxide, aluminum oxide, and titanium oxide; the thickness of the reflective layer is less than 10 micrometers; the reflectivity of the reflective layer is greater than 95%; and the wavelength range of the light reflected by the reflective layer is from 350 nanometers to 800 nanometers.

[0069] In this embodiment, please continue to refer to Figure 3 The circuit board 302 and the optical lens 200 are located on both sides of the light-emitting surface 301 in the X direction of the optical axis.

[0070] In other embodiments, please refer to Figure 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.

[0071] In some embodiments, the optical lens 200 includes a housing 203 having a light-incident end 201 and a light-exit end 202. The optical lens 200 has a dimension greater than 2 mm and less than 10 mm along the optical axis X.

[0072] In this embodiment, please continue to refer to Figure 3 The display panel 300 is completely located outside the housing 203, and is in contact with the housing 203. The light-incident end 201 and the light-excising end 202 are arranged opposite to each other. The light-excising surface 420 of the light-path steering element 400 is fixed to the light-incident end 201 of the optical lens 200, and the light-incident surface 410 of the light-path steering element 400 is fixed to the display panel 300. The light-emitting surface 301 of the display panel 300 is attached to the light-incident surface 410. The initial light signal L0 emitted by the light-emitting surface 301 enters the light-path steering element 400 and is reflected by the reflective surface 401 to form a steering light signal L1, which is then emitted from the light-excising surface and enters the light-incident end 201 of the optical lens 200.

[0073] In other embodiments, the display panel 300 is completely 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.

[0074] In other embodiments, please refer to Figure 8The light-emitting surface 301 is partially fixed to the housing 203, and the light path steering element 400 is at least partially located within the housing 203; in this embodiment, the light path steering element 400 is partially located within the housing 203. In other embodiments, the light path steering element 400 is entirely located within the housing 203.

[0075] Specifically, the light-emitting chip 303 has a first light-emitting part and a second light-emitting part. The first light-emitting part is fixed to the side wall of the housing 203 parallel to the optical axis X direction, and the second light-emitting part is located outside the housing 203.

[0076] The light-incident end 201 includes a first light-incident part 2011 and a second light-incident part 2012 connected together; the first light-incident part 2011 is located on the side wall of the housing 203 parallel to the optical axis X direction, and the first light-incident part 2011 is correspondingly arranged with the first light-emitting part; the second light-incident part 2012 is arranged opposite to the light-emitting end 202.

[0077] The light-emitting surface of the light-directing element 400 is fixed inside the housing 203, and the reflective surface 401 of the light-directing element 400 has a first reflective surface and a second reflective surface; the first reflective surface is disposed inside the housing 203 and is used to reflect the initial light signal L from the first light-emitting part. 02 The second reflective surface is disposed outside the housing 203 and is used to reflect the initial light signal L from the second light-emitting part. 01 .

[0078] The light-incident surface of the light-path steering element 400 has a first light-incident surface and a second light-incident surface; the first light-incident surface is disposed inside the housing 203 and is used to receive the initial light signal L from the first light-emitting part. 02 The second light-incident surface is disposed outside the housing 203 and is used to receive the initial light signal L from the second light-emitting part. 01 .

[0079] The initial light signal L emitted by the first light-emitting part of the light-emitting chip 303 02 The light enters the optical lens 200 from the first light-incident section, propagates through the first light-incident surface to the first reflective surface, and is reflected to form a steering light signal L. 12 The light propagates in the direction of the light-emitting end 202 and is emitted from the light-emitting end 202; the initial light signal L emitted by the second light-emitting part of the light-emitting chip 303 01 The light enters the optical path steering element 400 from the second incident surface and is reflected by the second reflecting surface to form a steering light signal L. 11 And propagates toward the second incident light section, the steering light signal L 11 After entering the optical lens 200 from the second light-incident section, it is emitted from the light-out end 202.

[0080] In other embodiments, please refer to Figure 9 All of the light-emitting surfaces 301 are fixed to the housing 203, and all of the light path steering elements 400 are located inside the housing 203.

[0081] The light-incident end 201 of the optical lens 200 is located on the side wall of the housing 203 parallel to the optical axis X. The light-incident end 201 is correspondingly disposed with respect to the light-emitting surface 301. The light-path steering element 400 is disposed inside the housing 203 and is correspondingly disposed with respect to the light-emitting surface 301. The light-incident surface of the light-path steering element 400 is fixed to the side wall of the housing 203 and corresponds to the light-incident end 201; the light-emitting surface is fixed inside the housing 203 and faces the light-emitting end 202; the reflective surface 401 faces the side of the housing 203 opposite to the light-emitting end 202 and is fixed inside the housing 203. The light-emitting chip 303 is fixed to the light-incident end 201. The initial light signal L0 emitted by the light-emitting surface 301 enters the light-incident surface of the optical lens 200 from the light-incident end 201, is reflected by the reflective surface 401, and forms a steering light signal L1 that is emitted from the light-emitting surface to the light-emitting end 202 and exits from the light-emitting end 202.

[0082] In summary, in this embodiment, by setting a light path steering element between the display panel and the optical lens, the normal direction of the emitting surface of the display panel can be made non-parallel to the optical axis of the optical lens. This allows the initial light signal emitted from the emitting surface to be redirected by the light path steering element, forming a redirected light signal that propagates towards the light-emitting end. Furthermore, the transmission direction of this redirected light signal has an angle of less than 90° with the optical axis (X-direction) of the optical lens. Because the normal direction of the emitting surface of the display panel can be non-parallel to the optical axis of the optical lens, the arrangement of the display panel relative to the optical lens becomes more flexible, which facilitates a reduction in the overall size of the optical projection module, thereby improving the wearing comfort and weight reduction of wearable electronic devices.

[0083] Accordingly, embodiments of the present invention also provide a wearable electronic device, the wearable electronic device comprising, as follows: Figures 3 to 9 The optical projection module shown is used in a wearable electronic device.

[0084] In some embodiments, the wearable electronic device is smart glasses. The smart glasses include a glasses body and the aforementioned optical projection module disposed within the glasses body. Since the temples of smart glasses have a slender structure, and the optical projection module in this application has a reduced size in a direction not parallel to the optical lens axis, it is more suitable for the structure of smart glasses. Correspondingly, it can also reduce the impact of the size of the glasses body on the size of the temples.

[0085] In other embodiments, the wearable electronic device may also be other wearable electronic devices, including a housing and an optical projection module disposed within the housing.

[0086] The display panel described above is a micro display panel.

[0087] The aforementioned microdisplay panel has a very small volume, with length and width dimensions between 500 μm and 50,000 μm. The light-emitting area of ​​the microdisplay panel is very small, for example, 1 mm × 1 mm, 2.64 mm × 2.02 mm, 3 mm × 5 mm, etc. The light-emitting area of ​​the microdisplay panel includes multiple micro-LED pixels arranged in an array, specifically in a pixel arrangement of 320 × 240, 640 × 480, 1600 × 1200, 1920 × 1080, or 2560 × 1440. The size of a single micro-LED pixel is between 100 nm and 100 μm. In some embodiments, the size of a single micro-LED pixel is between 150 nm and 15 μm. In some embodiments, the size of a single micro-LED pixel can be less than 10 μm.

[0088] A driving backplane is disposed on the back of the micro-LED pixel array. The driving backplane is electrically connected to the micro-LEDs in the micro-LED pixel array. The driving backplane can acquire signals such as image data from the outside world and can control the corresponding micro-LEDs to emit light or not emit light. The driving backplane is a TFT (Thin Film Transistor) board or an IC (Integrated Circuit) board.

[0089] For example, the driving backplane of the aforementioned 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 grayscale levels. 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 of the present invention.

[0090] It should be noted that the application of the aforementioned micro-display panel in this invention should not constitute a limitation on the application of this invention.

[0091] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. An optical projection module, characterized in that, include: An optical lens has an input light end and an output light end; A display panel corresponding to the light-incident end includes a light-emitting surface. The display panel includes a support plate and a light-emitting chip located on the surface of the support plate. The light-emitting chip includes the light-emitting surface. A light path steering element is used to acquire the initial light signal emitted from the light-emitting surface, and to redirect the initial light signal to form a steering light signal that propagates toward the light-emitting end. The light-emitting surface of the light-directing element is fixed to the light-incident end of the optical lens, and the light-incident surface of the light-directing element is fixed to the display panel, so that the normal direction of the light-emitting surface is not parallel to the optical axis direction of the optical lens. The support plate has a first dimension in the optical axis direction of the optical lens, and the support plate has a second dimension in a second direction, wherein the second direction is any direction perpendicular to the optical axis direction, and the first dimension is greater than or equal to the second dimension. The display panel further includes a circuit board, which is arranged parallel to the light-emitting surface. The circuit board and the optical lens are located on the same side of the support plate and arranged perpendicular to the optical axis. Along the optical axis, the projection area of ​​the circuit board is located within the projection area of ​​the support plate.

2. The optical projection module as described in claim 1, characterized in that, The optical path steering element includes a reflective surface, and there are angles between the reflective surface and the normal of the light-emitting surface, and between the reflective surface and the optical axis of the optical lens. The reflective surface is used to deflect the initial optical signal to form the steering optical signal transmitted to the light-emitting end.

3. The optical projection module as described in claim 2, characterized in that, The light path steering element is a prism, which includes an incident light surface, an exit light surface, and a reflective surface that are connected to each other. The incident light surface covers the light-emitting surface of the display panel, and the exit light surface corresponds to the incident light end of the optical lens. After the initial light signal enters the prism from the incident light surface, it is reflected by the reflective surface to form the steering light signal, which is emitted from the exit light surface.

4. The optical projection module as described in claim 3, characterized in that, The maximum size range of the prism in the direction parallel to the optical axis is 3 mm to 8 mm; the maximum size range of the prism in the direction perpendicular to the optical axis is 3 mm to 8 mm.

5. The optical projection module as described in claim 3, characterized in that, 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 as described in claim 3, characterized in that, The angle between the reflecting surface and the incident light surface is 44 to 46 degrees; the angle between the reflecting surface and the emitting light surface is 44 to 46 degrees.

7. The optical projection module as described in claim 2, characterized in that, The optical path steering element is a reflector, which includes a reflective surface. The reflective surface, the light-emitting surface, and the light-incident end constitute a propagation space. The initial optical signal is reflected by the reflective surface to form the steering optical signal directed toward the light-incident end.

8. The optical projection module as described in claim 2, characterized in that, The reflective surface has a reflective layer; the material of the reflective layer includes organic oxides, including silicon oxide, aluminum oxide, and titanium oxide; the thickness of the reflective layer is less than 10 micrometers; the reflectivity of the reflective layer is greater than 95%; the wavelength range of the light reflected by the reflective layer is from 350 nanometers to 800 nanometers.

9. The optical projection module as described in claim 2, characterized in that, The reflectivity of the reflective surface is greater than 95%; the angle between the initial light signal and the normal of the reflective surface is between -50 degrees and +50 degrees, and the initial light signal is positive when it turns clockwise and negative when it turns counterclockwise towards the normal of the reflective surface.

10. The optical projection module as described in claim 2, characterized in that, The angle between the reflective surface and the optical axis of the optical lens is 44 to 46 degrees.

11. The optical projection module as described in claim 2, characterized in that, The display panel is fixed to the light path steering element by 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 as described in claim 1, characterized in that, The optical lens includes a housing, which has the light-incident end and the light-outcident end.

13. The optical projection module as described in claim 12, characterized in that, The display panel is located outside the housing.

14. The optical projection module as described in claim 12, characterized in that, The light-emitting surface is at least partially fixed inside the housing, and the light path steering element is at least partially located inside the housing.

15. The optical projection module as described in claim 1, characterized in that, The circuit board is one or a combination of rigid circuit boards and flexible circuit boards.

16. The optical projection module as described in claim 1, characterized in that, The light-emitting chip is a liquid crystal display chip, a light-emitting diode chip, or a laser chip.

17. The optical projection module as claimed in claim 1, characterized in that, The light-emitting chip includes an organic light-emitting diode chip, a micro light-emitting diode chip, or a mini light-emitting diode chip.

18. The optical projection module as described in claim 1, characterized in that, The size of the light-emitting chip is 0.05 inches to 0.5 inches.

19. The optical projection module as described in claim 1, characterized in that, The optical lens has a dimension greater than 2 mm and less than 10 mm along the optical axis.

20. A wearable electronic device, characterized in that, Includes the optical projection module as described in any one of claims 1 to 19.

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