Scanning display module

Abstract

The utility model discloses a scanning display module. The scanning display module comprises a shell, a piezoelectric device, an optical fiber, a heat conduction device and a heating device, the optical fiber is fixed on the piezoelectric device, the heat conduction device surrounds the piezoelectric device, and the heating device is arranged on the heat conduction device. Because the piezoelectric device is surrounded by the heat conduction device, when the heating device works, the heat conduction device is rapidly heated and heats the surrounding air, and the piezoelectric device is rapidly and uniformly heated, so that the influence of the environment temperature change on the characteristics of the piezoelectric device is eliminated, and the performance stability of the piezoelectric device is ensured.

Description

Technical Field

[0001] The utility model relates to the field of projection display, and in particular to a scanning display module. Background Art

[0002] The imaging principle of fiber scanning display (FSD) technology is that an actuator drives an optical fiber to move along a predetermined two-dimensional scanning trajectory, modulates a light source to output light corresponding to each pixel of an image to be displayed, and then projects the light corresponding to each pixel of the image to be displayed onto a projection surface one by one through the optical fiber to form a projected picture.

[0003] In FSD applications, the actuator is usually composed of multiple piezoelectric devices, and the structure is generally complex, resulting in complex frequency characteristics. When the temperature changes, the characteristics of the piezoelectric devices change non-linearly, which will cause changes in the projection picture and affect the imaging quality. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a scanning display module to alleviate the technical problem existing in the prior art that when the temperature changes, the characteristics of the piezoelectric devices change non-linearly, which will cause changes in the projection picture and affect the imaging quality.

[0005] To achieve the above-mentioned utility model purpose, the utility model provides a scanning display module, including: a housing, a piezoelectric device, an optical fiber, a heat conduction device and a heating device; the optical fiber is fixed on the piezoelectric device, the heat conduction device surrounds the piezoelectric device, and the heating device is arranged on the heat conduction device.

[0006] Optionally, the heat conduction device is a U-shaped device, the U-shaped device is provided with a U-shaped groove along the length direction, the piezoelectric device is arranged in the U-shaped groove, and the light output direction of the optical fiber faces the opening direction of the U-shaped groove.

[0007] Optionally, the heating device is arranged at the bottom of the U-shaped device.

[0008] Optionally, the heat conduction device is a tubular device, and the piezoelectric device is arranged in the cavity of the tubular device.

[0009] Optionally, the heating device is a thin-film heating device.

[0010] Optionally, the scanning display module includes a flexible conductive device, which is arranged on the thin-film heating device and connected to the thin-film heating device.

[0011] Optionally, the heat conduction device is made of metal or polymer material.

[0012] Optionally, the metal is copper, aluminum or silver.

[0013] Optionally, a heat insulating material is provided on the outer side of the housing.

[0014] Optionally, the scanning display module includes a temperature sensor, and the temperature sensor is embedded in the heat conduction device.

[0015] Compared with the prior art, the present utility model has the following beneficial effects:

[0016] In the solution of the embodiment of the present invention, since the piezoelectric device is surrounded by the heat conduction device, when the heating device works, the heat conduction device quickly heats up and heats the surrounding air, and the piezoelectric device is quickly and uniformly heated to maintain the operating temperature of the piezoelectric device higher than the ambient temperature of the scanning display module, thereby eliminating the influence of ambient temperature changes on the characteristics of the piezoelectric device and ensuring the performance stability of the piezoelectric device. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings:

[0018] Figure 1A It is a schematic structural diagram of a scanning display module provided by an embodiment of the present utility model;

[0019] Figures 1B - 1C It is a side view of a scanning display module provided by an embodiment of the present utility model;

[0020] Figure 2 It is a schematic diagram of a housing of a scanning display module provided by an embodiment of the present utility model;

[0021] Figure 3A It is a schematic diagram of a heat insulating material of a scanning display module provided by an embodiment of the present utility model;

[0022] Figure 3B It is a cross-sectional view of a scanning display module provided by an embodiment of the present utility model;

[0023] Figure 4A It is a schematic diagram of the internal structure of a scanning display module provided by an embodiment of the present utility model;

[0024] Figure 4B It is a top view of the internal structure of a scanning display module provided by an embodiment of the present utility model;

[0025] Figure 4C A cross-sectional view of the internal structure of a scanning display module provided by an embodiment of the present utility model. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present utility model.

[0027] In an embodiment of the present invention, the piezoelectric device can be composed of piezoelectric ceramic PZT. The response characteristics of the piezoelectric device will change with the change of environmental conditions such as temperature. The purpose of the present utility model is to compensate for the change in the response characteristics of the actuator caused by the change of external conditions such as temperature.

[0028] As Figures 1A - 2 shown, the scanning display module includes a housing 101, a piezoelectric device 102, an optical fiber 103, a heat conduction device 104, and a heating device 105; the optical fiber 103 is fixed on the piezoelectric device 102, the heat conduction device 104 surrounds the piezoelectric device 102, and the heating device 105 is disposed on the heat conduction device 104.

[0029] In an embodiment of the present utility model, the heat conduction device 104 can be a U-shaped device. As shown in FIG. 1, the U-shaped device is provided with a U-shaped groove in the length direction. The piezoelectric device 102 is disposed in the U-shaped groove, and the light-emitting direction of the optical fiber 103 faces the opening direction of the U-shaped groove. In order to improve the heat conduction efficiency of the heat conduction device 104, the heat conduction device 104 can be made of a metal material with high heat conduction efficiency, such as copper, aluminum, or silver. The heating device 105 is disposed at the bottom of the U-shaped metal part. Since the heat conduction efficiency of the U-shaped metal part is high, the piezoelectric device 102 is surrounded by the U-shaped metal part. When the heating device 105 works, the U-shaped metal part quickly heats up and heats the surrounding air, so that the piezoelectric device 102 can be quickly and uniformly heated. In other embodiments, the heat conduction device 104 can also be made of a non-metal material with high heat conduction efficiency, for example, a polymer material.

[0030] In another possible embodiment, the heat conduction device 104 can be a tubular device, and the piezoelectric device 102 is disposed in the cavity of the tubular device. As described in the foregoing embodiments, in order to improve the heat conduction efficiency of the heat conduction device 104, the heat conduction device 104 can be made of a metal material with high heat conduction efficiency, such as copper, aluminum, or silver. The heating device 105 is disposed outside the tubular metal member. Since the tubular metal member has a high heat conduction efficiency and the piezoelectric device 102 is surrounded by the tubular metal member, when the heating device 105 operates, the tubular metal member quickly heats up and heats the surrounding air, so that the piezoelectric device 102 can be quickly and uniformly heated.

[0031] In the embodiment of the present invention, the heating device 105 can be a thin film heating device. The thin film heating device is printed on the thin film with a high resistance material, which can not only realize the heating function but also save volume. The flexible conductive device 106, such as an FPC (Flexible Printed Circuit Board), is disposed on the thin film heating device. As Figure 3B shown, the heating device 105 is electrically connected to the FPC through a pad. The tail of the FPC can be mounted with a temperature sensor 107 and embedded in the U-shaped metal member.

[0032] As Figures 3A - 4C shown, the scanning display module is fixed on the housing 101, and the front end of the housing 101 is connected to the lens 108. A layer of heat insulation material 109 is wrapped on the surface of the housing 101. The heat insulation material 109 has a high thermal resistance, which further reduces the influence of external temperature changes on the inside of the housing 101, and at the same time prevents internal heat loss and reduces thermal power consumption.

[0033] All features disclosed in this specification, or all steps in the disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any manner.

[0034] Any feature disclosed in this specification (including any additional claims, abstract, and drawings), unless specifically recited, can be replaced by other equivalent or similar-purpose alternative features. That is, unless specifically recited, each feature is only an example of a series of equivalent or similar features.

[0035] The present invention is not limited to the foregoing specific embodiments. The present invention extends to any new feature or any new combination disclosed in this specification, as well as any new combination of steps of any new method or process disclosed.

Claims

1. A scanning display module, characterized in that, Comprising: A housing, a piezoelectric device, an optical fiber, a heat conduction device, and a heating device; the optical fiber is fixed on the piezoelectric device, the heat conduction device surrounds the piezoelectric device, and the heating device is arranged on the heat conduction device.

2. The scanning display module according to claim 1, wherein, The heat conduction device is a U-shaped device, the U-shaped device is provided with a U-shaped groove in the length direction, the piezoelectric device is arranged in the U-shaped groove, and the light-emitting direction of the optical fiber faces the opening direction of the U-shaped groove.

3. The scanning display module according to claim 2, wherein The heating device is arranged at the bottom of the U-shaped device.

4. The scanning display module according to claim 1, characterized in that, The heat conduction device is a tubular device, and the piezoelectric device is arranged in the cavity of the tubular device.

5. The scanning display module according to any one of claims 1-4, characterized in that The heating device is a thin-film heating device.

6. The scanning display module according to claim 5, wherein The scanning display module includes a flexible conductive device, which is arranged on the thin-film heating device and connected to the thin-film heating device.

7. The scanning display module according to claim 1, wherein, The heat conduction device is made of metal or polymer material.

8. The scanning display module according to claim 7, characterized in that The metal is copper, aluminum or silver.

9. The scanning display module according to claim 1, wherein The outside of the housing is provided with heat-insulating material.

10. The scanning display module according to claim 1, characterized in that, The scanning display module includes a temperature sensor, and the temperature sensor is embedded in the heat conduction device.

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