Wearable display device

Abstract

A wearable display device comprises a support body, a bearing frame, a display module and a transparent cooling fin. The bearing frame is connected to the support body and provided with a containing space. The display module is arranged in the accommodating space and provided with a first surface and a second surface which are opposite, the display module is used for projecting an image light beam, and the image light beam is projected out of the display module from one of the first surface and the second surface. The transparent radiating fin is arranged on at least one of the first surface and the second surface. The wearable display device can improve the problem that the service life of the element is shortened due to high temperature, and can prevent the display module from generating local hot spots to influence the quality of image display.

Description

Technical Field

[0001] The present invention relates to a display device, and more particularly to a wearable display device. Background Art

[0002] When a general viewer uses a wearable display device, the device is mainly supported by parts such as the head or ears. Therefore, in terms of the consideration of the appearance design of the wearable display device, it is hoped to move towards the direction of being light, compact and miniaturized. However, to meet the requirement of being light, compact and miniaturized, the heat dissipation area often has to be sacrificed. On the other hand, as the functions of the wearable display device become more diverse and the amount of computation gradually increases, the overall thermal wattage rises. And because the wearable display device is relatively close to the human ear, in the prior art, the heat generated by the heat source is mainly processed by natural convection.

[0003] When the wearable display device meets the requirements of being lightweight and multifunctional, the problem it faces is that the thermal wattage rises, but the area available for heat dissipation has to be reduced. This will very likely cause the key components to overheat, and then lead to the abnormal operation of the wearable display device. Therefore, how to improve the problem that the components of the wearable display device exceed the specified temperature due to insufficient heat dissipation area and affect the service life of the components is the direction that the current industry highly values and researches.

[0004] The "Background Art" paragraph is only used to help understand the content of the present invention. Therefore, the content disclosed in the "Background Art" paragraph may include some known technologies that are not known to those skilled in the art of the relevant technical field. The content disclosed in the "Background Art" paragraph does not represent that the content or the problems to be solved by one or more embodiments of the present invention have been known or recognized by those skilled in the art of the relevant technical field before the application of the present invention. Summary of the Invention

[0005] The present invention provides a wearable display device, which can improve the problem that the service life of the components of the wearable display device is reduced due to high temperature, and can also avoid the generation of local hot spots in the display module and affect the image display quality.

[0006] Other objects and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

[0007] To achieve one or part or all of the above objects or other objects, a wearable display device according to an embodiment of the present invention includes a bracket body, a carrier frame, a display module, and a transparent heat sink. The carrier frame is connected to the bracket body, and the carrier frame has an accommodation space. The display module is disposed in the accommodation space and has opposite first and second surfaces. The display module is used for projecting an image light beam, and the image light beam is projected out of the display module from one of the first and second surfaces. The transparent heat sink is disposed on at least one of the first and second surfaces.

[0008] In the present invention, by disposing a transparent heat sink on the surface of the display module, the heat transferred from a heat source (such as an optical engine) to the bracket body can be conducted to the transparent heat sink, so that the heat can be evenly distributed on the display module, thereby making full use of the area of the display module (or the transparent heat sink) to enhance the heat dissipation ability of the wearable display device for the heat source. Or by disposing a transparent heat sink on the surface of the display module, the heat generated by the display module during imaging can be conducted to the carrier frame and the bracket body through the transparent heat sink, so that the heat is evenly distributed and dissipated, and hot spots caused by local high temperature of the display module can be avoided.

[0009] To make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are specifically described in detail in conjunction with the accompanying drawings. Description of the Drawings

[0010] Figure 1 It is a schematic structural diagram of a wearable display device according to an embodiment of the present invention.

[0011] Figure 2 It is a partially exploded schematic diagram of a wearable display device according to an embodiment of the present invention.

[0012] Figure 3 It is a top view schematic diagram of the configuration of an assembled carrier frame, display module, and transparent heat sink according to an embodiment of the present invention.

[0013] Figure 4 It is a schematic diagram of the configuration of an assembled optical engine, part of the bracket body, and display module according to an embodiment of the present invention.

[0014] Figure 5 It is a schematic structural diagram of a wearable display device according to another embodiment of the present invention.

[0015] Figure 6 It is a partially exploded schematic diagram of a wearable display device according to another embodiment of the present invention.

[0016] Figure 7 It is a top view schematic diagram of the configuration of an assembled carrier frame, display module, and transparent heat sink according to another embodiment of the present invention. Detailed Description of the Embodiments

[0017] Regarding the foregoing and other technical contents, features, and effects of the present invention, they will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front, or back, etc., are only with reference to the directions of the accompanying drawings. Therefore, the directional terms used are for illustration and not for limiting the present invention.

[0018] Figure 1FIG. 0 is a schematic structural diagram of a wearable display device according to an embodiment of the present invention. Figure 2 FIG. 1 is a partial exploded schematic diagram of a wearable display device according to an embodiment of the present invention. As Figure 1 and Figure 2 shown, the wearable display device 10 includes a bracket body 12, a carrier frame 14, a display module 16, and a transparent heat sink 18. The carrier frame 14 is connected to the bracket body 12, and the carrier frame 14 has an accommodation space 141. The display module 16 is disposed in the accommodation space 141 and has opposite first and second surfaces 161 and 162. The display module 16 is configured to project an image light beam Li, and the image light beam Li projects out of the display module 16 from one of the first surface 161 and the second surface 162. The transparent heat sink 18 is disposed on at least one of the first surface 161 and the second surface 162. In one embodiment, as Figure 1 and Figure 2 shown, the number of the transparent heat sinks 18 is two, and they are respectively disposed on the first surface 161 and the second surface 162 of the display module 16; however, it is not limited thereto. The transparent heat sink 18 may be a single piece disposed on the first surface 161 or disposed on the second surface 162.

[0019] In one embodiment, as Figure 1 and Figure 2 shown, the number of the carrier frames 14 is, for example, two, and the two carrier frames 14 are connected to the bracket body 12 at intervals to respectively correspond to the positions of the left and right eyes of a human body. Corresponding to the number of the carrier frames 14, the number of the display modules 16 is also two, and they are respectively disposed in the accommodation spaces 141 of the two carrier frames 14. However, it is not limited thereto. In an embodiment not shown, a single carrier frame 14 may be shared corresponding to the positions of the left and right eyes, and then the number of the display modules 16 is one, and the display module 16 can project different image light beams Li corresponding to the positions of the left and right eyes.

[0020] Among them, the material of the transparent heat sink 18 is selected from one of graphene and metal thin films. The visible light transmittance of the transparent heat sink 18 is greater than or equal to 70%, and the thermal conductivity is greater than or equal to 100 W / mK. For example, graphene has an extremely low light absorption rate (about 2.3%) and is almost completely transparent. Therefore, when graphene is used as the transparent heat sink 18 and disposed on the first surface 161 and / or the second surface 162 of the display module 16, it will not affect the user's visual enjoyment of the content displayed by the display module and the external environment. Graphene also has a high thermal conductivity. The sheet-like graphene layer is a heterogeneous structure. In terms of the sheet-like graphene layer extending in the XY plane and having a thickness in the Z direction, the thermal conductivity of the graphene layer in the XY plane can be as high as 5300 W / mK, and the thermal conductivity in the Z direction (thickness direction) is 7 W / mK. The sheet-like graphene layer has a good temperature equalization effect and can avoid local high temperature from affecting the imaging quality. On the other hand, the metal thin film can be a transparent conductive and heat-conductive thin film, and its material is a metal film formed as follows The following formed metal film, for example, is an indium tin oxide thin film. In one embodiment, the transparent heat sink 18 can be disposed on the first surface 161 and / or the second surface 162 via a chemical vapor deposition process, a coating process, or an attachment process, but is not limited thereto.

[0021] Continuing the above description, specifically, as Figure 1 and Figure 2 shown, the bracket body 12 has a lapping surface 121; the carrier frame 14 has a U-shaped structure, including a bottom frame 142 and two side frames 143. The two side frames 143 are respectively connected to the bottom frame 142 perpendicular to the extending direction of the bottom frame 142, so that the bottom frame 142 is located between the two side frames 143. The end 143a of each side frame 143 away from the bottom frame 142 is connected to the lapping surface 121 of the bracket body 12, and the two side frames 143 and the bottom frame 142 form a receiving space 141. In other embodiments, the two side frames 143 are respectively connected to the bottom frame 142 in an inclined manner with respect to the bottom frame 142. The present invention is not limited thereto. As long as the receiving space surrounded by the two side frames and the bottom frame can accommodate the display module 16, it falls within the scope of the present invention. The material of the carrier frame 14 is, for example, a metal material or a carbon fiber material, and the metal material can be an aluminum alloy or a titanium alloy. In one embodiment, as Figure 1 and Figure 2As shown, the wearable display device 10 further includes a plurality of thermal interface material layers 20, which are respectively disposed on the surfaces of the end portions 143a of the two side frames 143 of the carrier frame 14 away from the bottom frame 142, so that the plurality of thermal interface material layers 20 are respectively located between the overlapping surface 121 and the two side frames 143, thereby reducing the contact thermal resistance between the overlapping surface 121 and the two side frames 143; in other embodiments, the end portion 143a of each side frame 143 away from the bottom frame 142 can be directly connected to the overlapping surface 121 of the bracket body 12, and it is not necessary to provide a thermal interface material layer 20 on the surface of the end portion 143a.

[0022] Figure 3 FIG. 4 is a top view schematic diagram of the configuration of the carrier frame, the display module and the transparent heat sink assembled according to an embodiment of the present invention. As Figure 3 shown, the display module 16 has a side surface 163, and the side surface 163 connects the first surface 161 and the second surface 162, and the transparent heat sink 18 is disposed on the first surface 161 and the second surface 162. In one embodiment, each side frame 143 of the carrier frame 14 may include a side portion 144 and two clamping portions 145. The two clamping portions 145 are opposite to each other and connected to the side portion 144. The two opposite sides of the side portion 144 are respectively connected to the two clamping portions 145. That is, the cross section of each side frame 143 in the top view presents a U-shaped structure. Among them, the side portion 144 corresponds to the side surface 163 of the display module 16, and the two clamping portions 145 clamp the display module 16 and the transparent heat sink 18. In this embodiment, the two clamping portions 145 of each side frame 143 respectively cover at least a part of the first surface 161 and at least a part of the second surface 162 of the display module 16, for example. In one embodiment, as Figure 1 , Figure 2 and Figure 3 shown, the wearable display device 10 further includes at least one thermal interface material layer 22. There are a plurality of thermal contact surfaces 146 (marked in Figure 2 and Figure 3 ) between the carrier frame 14 and the display module 16 and / or between the carrier frame 14 and the transparent heat sink 18. At least one thermal interface material layer 22 is disposed on at least one of these thermal contact surfaces 146. Specifically, the thermal contact surfaces 146 may be located between the side portions 144 of the two side frames 143 and the side surface 163 of the display module 16, between the two clamping portions 145 and the transparent heat sink 18, and / or between the bottom frame 142 and the transparent heat sink 18. As Figure 1 and Figure 2As shown, the thermal interface material layer 22 is an integrally formed U-shaped structure that matches the outer shape of the carrier frame 14. In this way, the thermal interface material layer 22 can be disposed between the side portion 144 and the side surface 163 of the display module 16, between the two clamping portions 145 and the transparent heat sink 18, and between the bottom frame 142 and the transparent heat sink 18, but is not limited thereto. In other embodiments, the number of the thermal interface material layers 22 can be multiple, and they are respectively disposed on at least one of the heat contact surfaces 146. The outer shape and the number of the thermal interface material layers 22 are not limited herein.

[0023] In the wearable display device according to the embodiment of the present invention, its display technology is mainly divided into passive display technology (such as LCD projection or DLP projection technology) and active display technology (such as Micro OLED or Micro LED display technology). When the wearable display device 10 uses passive display technology, as Figure 1 and Figure 2 shown, the wearable display device 10 further includes an optical engine 30 disposed on the bracket body 12. Figure 4 is a schematic configuration diagram of the optical engine, a part of the bracket body, and the display module assembled according to an embodiment of the present invention. As Figure 4 shown, the optical engine 30 is disposed on the overlapping surface 121 of the bracket body 12. The optical engine 30 is used to transmit the image light beam Li to the display module 16. Among them, the display module 16 includes a waveguide plate, and the waveguide plate is, for example, a glass lens having a microstructure on its surface. Specifically, the overlapping surface 121 of the bracket body 12 has an opening 122. The display module 16 has a first part 16a and a second part 16b. The first part 16a of the display module 16 is received in the accommodation space 141 of the carrier frame 14 (marked in Figure 2 ), and the second part 16b of the display module 16 passes through the opening 122 and is away from the bottom frame 142 of the carrier frame 14 (marked in Figure 2 ). That is, the second part 16b of the display module 16 is not located in the accommodation space 141 of the carrier frame 14, but passes through the opening 122 to be located inside the bracket body 12, so that the image light beam Li projected by the optical engine 30 can enter the display module 16 through the second part 16b of the display module 16, and is transmitted in the display module 16, and is projected to the human eye 42 through the first part 16a of the display module 16. In one embodiment, as Figure 1 and Figure 2 shown, the transparent heat sink 18 can be disposed on the first surface 161 and / or the second surface 162 of the entire surface of the display module 16. Or, the transparent heat sink 18 can be disposed on the first surface 161 and / or the second surface 162 of the first part 16a. That is, the transparent heat sink 18, the first surface 161 of the first part 16a, and / or the second surface 162 of the first part 16a are all used to allow the image light beam Li to penetrate.

[0024] Continuing the above description, corresponding to the two sets of display modules 16, the number of optical engines 30 is two sets, which respectively transmit the image light beams Li to the two display modules 16. In an embodiment not shown, when the left and right eyes share the same display module 16, the number of optical engines 30 is also two sets, which respectively transmit different image light beams Li to the display areas corresponding to the left and right eyes. In one embodiment, as Figure 1 and Figure 2 shown, the wearable display device 10 further includes a thermal interface material layer 24 disposed between the optical engine 30 and the bracket body 12. Specifically, the thermal interface material layer 24 is disposed between the optical engine 30 and the overlapping surface 121. In Figure 1 , and the arrow 32 represents the heat transfer direction of the optical engine 30. Among them, by providing the thermal interface material layer 24, the heat of the optical engine 30 can be transferred to the overlapping surface 121 through the thermal interface material layer 24, and further the heat can be conducted to the transparent heat sink 18 through the thermal interface material layer 20 and / or the thermal interface material layer 22, so that the heat can be evenly distributed on the display module 16, so as to make full use of the area of the display module 16 to enhance the heat dissipation ability of the wearable display device 10 for heat sources (such as the optical engine 30).

[0025] Figure 5 is a schematic structural diagram of a wearable display device according to another embodiment of the present invention. Figure 6 is a partially exploded schematic diagram of a wearable display device according to another embodiment of the present invention. When the wearable display device 10A uses active display technology, as Figure 5 and Figure 6 shown, the wearable display device 10A includes a bracket body 12A, a carrier frame 14, an image processing module 34, a display module 36 (labeled in Figure 6 ), and a transparent heat sink 18. The carrier frame 14 is connected to the bracket body 12A, and the carrier frame 14 has an accommodation space 141. The display module 36 is disposed in the accommodation space 141 and has opposite first and second surfaces 361 and 362. The display module 36 is used to project the image light beam Li, and the image light beam Li is projected out of the display module 36 from one of the first surface 361 and the second surface 362. Figure 7 is a top view schematic diagram of the assembled configuration of the carrier frame, the display module and the transparent heat sink according to another embodiment of the present invention. Please refer to Figure 6 and Figure 7As shown, when the wearable display device 10A employs an active display technology, the display module 36 includes a light source module 38 and two transparent substrates 40, and the light source module 38 is disposed between the two transparent substrates 40. The image processing module 34 is disposed on the bracket body 12A and electrically connected to the light source module 38. The transparent heat sink 18 is disposed on at least one of the first surface 361 and the second surface 362 of the display module 36. In this embodiment, one surface of the transparent substrate 40 away from the light source module 38 is the first surface 361 of the display module 36, and the other surface of the transparent substrate 40 away from the light source module 38 is the second surface 362 of the display module 36, that is, the transparent heat sink 18 is disposed on at least one surface of the two transparent substrates 40 away from the light source module 38. In one embodiment, as Figure 6 and Figure 7 shown, the number of the transparent heat sinks 18 is two, which are respectively disposed on the first surface 361 and the second surface 362 of the display module 36; however, it is not limited thereto, and the transparent heat sink 18 may be a single piece, which is disposed on the first surface 361 or the second surface 362.

[0026] Among them, regarding the material of the transparent heat sink 18, the structure of the carrier frame 14 and the configuration relationship with the bracket body 12A, and the configuration of the thermal interface material layers 20 and 22, etc., are substantially the same as or similar to those in the above Figures 1 to 3 shown embodiment, and will not be elaborated herein. Among them, an opening for the display module 36 to pass through does not need to be formed on the overlapping surface 121 of the bracket body 12A, and a through hole (not shown in the figure) for electrically connecting the image processing module 34 and the light source module 38 may be selectively formed. Also, when the number of the carrier frames 14 is, for example, two, and they are spaced apart and connected to the bracket body 12A to respectively correspond to the positions of the left and right eyes of the human body, and the number of the display modules 36 is two, which are respectively disposed in the accommodation spaces 141 of the two carrier frames 14, then the image processing module 34 is also in two groups, respectively controlling the two display modules 36 to project image light beams Li. In an embodiment not shown, a single carrier frame 14 may be shared corresponding to the positions of the left and right eyes, and the left and right eyes share a display module 36, then the image processing module 34 may be in one group or two groups to control the display module 36 to project different image light beams Li corresponding to the positions of the left and right eyes.

[0027] Continuing with the above description, in the display module 36, the light source module 38 includes a plurality of self-luminous light sources 381. These self-luminous light sources 381 can be selected, for example, from at least one of an array of light-emitting diode elements and an array of organic light-emitting diode elements. By controlling the switching or luminous power of each self-luminous light source 381 through the image processing module 34 to form an image and generate an image beam Li, the temperature of the light source module 38 will rise during the imaging process. During the imaging process, each self-luminous light source 381 is independently switched, which may cause uneven temperature distribution in the display module 36. By providing the transparent heat sink 18 on the first surface 361 and / or the second surface 362, the problem of local hot spots caused by uneven temperature distribution in the display module 36 can be improved. In Figure 5 this, the heat transfer direction of the display module 36 is indicated by an arrow 42. Further, the transparent heat sink 18 conducts the heat generated by the imaging of the display module 36, for example, through the thermal interface material layer 22 to the carrier frame 14, and then, for example, through the thermal interface material layer 20 to the bracket body 12A, so that the heat is evenly distributed, avoiding local high temperature in the display module 36 and preventing the image display quality from being affected by the long-term generation of local hot spots.

[0028] In summary, the wearable display device according to the embodiment of the present invention can, by providing the transparent heat sink on the surface of the display module, improve the problem that the component life is affected due to the insufficient heat dissipation area of the wearable display device resulting in the component temperature exceeding the specification temperature; it can also avoid the problem that the image display quality of the display module of the wearable display device is affected due to the generation of local hot spots.

[0029] However, the above are only the preferred embodiments of the present invention, and the scope of implementation of the present invention cannot be limited thereby. That is, all simple equivalent changes and modifications made according to the claims of the present invention and the content of the invention still fall within the scope covered by the patent of the present invention. In addition, any embodiment or claim of the present invention does not have to achieve all the purposes, advantages or characteristics disclosed in the present invention. In addition, the abstract and the title (invention name) are only used to assist in the retrieval of patent documents and are not used to limit the scope of rights of the present invention. In addition, the terms "first", "second", etc. mentioned in this specification or claims are only used to name the elements or distinguish different embodiments or scopes, and are not used to limit the upper or lower limits of the number of elements.

Claims

1. A wearable display device, characterized in that, The wearable display device includes a bracket body, at least one carrier frame, a display module, and at least one transparent heat sink, where: The at least one carrier frame is connected to the bracket body, and the at least one carrier frame has an accommodation space; The display module is disposed in the accommodation space and has opposite first and second surfaces. The display module is configured to project image light beams, and the image light beams are projected out of the display module from one of the first surface and the second surface; and The at least one transparent heat sink is disposed on at least one of the first surface and the second surface.

2. The wearable display device according to claim 1, wherein The material of the at least one transparent heat sink is selected from one of graphene and metal thin films.

3. The wearable display device according to claim 1, wherein The visible light transmittance of the at least one transparent heat sink is greater than or equal to 70%, and the thermal conductivity coefficient is greater than or equal to 100 W / mK.

4. The wearable display device according to claim 1, wherein The number of the at least one transparent heat sink is two, which are respectively disposed on the first surface and the second surface of the display module.

5. The wearable display device according to claim 1, wherein The bracket body has a lapping surface. The at least one carrier frame includes a bottom frame and two side frames. The two side frames are respectively connected to the bottom frame perpendicular to the extending direction of the bottom frame, such that the bottom frame is located between the two side frames. The end of each side frame away from the bottom frame is connected to the lapping surface of the bracket body, and the two side frames and the bottom frame form the accommodation space.

6. The wearable display device according to claim 5, wherein The wearable display device further includes a thermal interface material layer, and the thermal interface material layer is disposed on the surface of the end of each side frame away from the bottom frame.

7. The wearable display device according to claim 5, characterized in that The display module has a side surface connecting the first surface and the second surface. Each side frame includes a side portion and two clamping portions. The two clamping portions are opposite to each other and connected to the side portion. Wherein, the side portion corresponds to the side surface of the display module, and the two clamping portions clamp the display module and the at least one transparent heat sink.

8. The wearable display device according to claim 7, wherein The wearable display device further includes a thermal interface material layer. There is at least one thermal contact surface between the at least one carrier frame and the display module and / or between the at least one carrier frame and the at least one transparent heat sink, and the thermal interface material layer is disposed on the at least one thermal contact surface.

9. The wearable display device according to claim 8, wherein The at least one thermal contact surface is located at least one of between the side portion of the two side frames and the side surface of the display module, between the two clamping portions and the at least one transparent heat sink, and between the bottom frame and the transparent heat sink.

10. The wearable display device according to claim 5, wherein The lapping surface has an opening. The display module has a first part and a second part. The first part of the display module is accommodated in the accommodation space, and the second part of the display module passes through the opening to be away from the bottom frame of the carrier frame.

11. The wearable display device according to claim 10, wherein, The at least one transparent heat sink is disposed on at least one of the first surface and the second surface of the first part of the display module.

12. The wearable display device according to claim 1, wherein The wearable display device further includes an optical engine. The optical engine is disposed on the bracket body. The display module includes a waveguide sheet, and the optical engine is configured to transmit the image light beams to the display module.

13. The wearable display device according to claim 12, characterized in that, The wearable display device further includes a thermal interface material layer, which is disposed between the optical engine and the bracket body.

14. The wearable display device according to claim 1, wherein The wearable display device further includes an image processing module. The display module includes a light source module and two transparent substrates. The light source module is disposed between the two transparent substrates, and the image processing module is disposed on the bracket body and electrically connected to the light source module.

15. The wearable display device according to claim 14, wherein The light source module includes a plurality of self-luminous light sources.

16. The wearable display device according to claim 15, wherein The plurality of self-luminous light sources are selected from at least one of a light emitting diode element array and an organic light emitting diode element array.

17. The wearable display device according to claim 14, wherein, The at least one transparent heat sink is disposed on at least one surface of the two transparent substrates away from the light source module.

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