A car-mounted head-up display device and a car capable of avoiding screen burn

Abstract

The utility model discloses a kind of vehicle-mounted head-up display devices and car that avoid screen burn, vehicle-mounted head-up display device includes first free curved mirror, second free curved mirror and TFT display module arranged in order of light ray propagation path, first free curved mirror can be deflected along axial direction, under the irradiation of parallel light and under the deflection of first free curved mirror, second free curved mirror is formed with innumerable possible focal points arranged in straight line on it, second free curved mirror back light surface is provided with multiple temperature sensors, multiple temperature sensors are sequentially arranged on possible focal point.Temperature sensor needs to be placed several, and temperature sensor is arranged in a straight line, the straight line and the straight line of the focal point of first free curved mirror overlap, when the temperature of the position where some temperature sensor is located is higher and reaches warning value, then the angle of first free curved mirror can be adjusted to make it deflect, let its focal point on TFT display module change, to avoid screen burn.

Description

Technical Field

[0001] This utility model relates to the field of display technology, and more specifically, to a vehicle head-up display device and automobile that avoids screen burn-in. Background Technology

[0002] The installation volume of HUD (Head-Up Display) devices has been increasing year by year, especially those using TFT display modules as the image source. The light emitted from the image source of the TFT display module is projected onto the windshield through the internal optical path. Due to the reversibility of the optical path, sunlight can also return to the surface of the TFT display module through the optical path. Since the freeform mirror in the internal optical path is a concave mirror, it has the effect of focusing light. Sunlight is finally focused onto the surface of the TFT display module after passing through the freeform mirror and the plane mirror. The light spot gathers on the surface of the polarizer, causing damage to the polarizer, commonly known as "burn-in".

[0003] The traditional approach is to place the temperature sensor on the non-polarized area on the back of the TFT display module. This area is not illuminated by the backlight and is far from the focal point of the freeform mirror. For heat to reach the temperature sensor, it must pass through the polarizer, the upper glass, the liquid crystal layer, and the lower glass. Since the thermal conductivity of these materials is low, very little heat is transferred to the temperature sensor, making it impossible to effectively detect the hottest central area. Furthermore, there is no linear relationship between the temperature of the central area and the temperature where the temperature sensor is placed. Therefore, the traditional method of placing the temperature sensor here cannot accurately reflect the temperature of the TFT display module, causing the "burn-in" phenomenon to still occur frequently. Utility Model Content

[0004] The technical problem this invention aims to solve is how to accurately measure the temperature of the display module to avoid screen burn-in.

[0005] The technical problem to be solved by this utility model is achieved through the following technical solution: To solve the above-mentioned technical problems, this utility model provides a vehicle head-up display device that avoids screen burn-in. It includes a first freeform surface mirror, a second freeform surface mirror, and a TFT display module arranged sequentially according to the light propagation path. The first freeform surface mirror can be deflected along the axial direction. Under the illumination of parallel light and the deflection of the first freeform surface mirror, numerous possible focal points are formed on the second freeform surface mirror arranged in a straight line. Multiple temperature sensors are arranged on the back surface of the second freeform surface mirror, and the multiple temperature sensors are arranged sequentially on the possible focal points.

[0006] As a preferred embodiment of the vehicle head-up display device for avoiding screen burn-in provided by this utility model, a drive motor is provided on the first freeform mirror, and the drive motor can drive the first freeform mirror to deflect along the axial direction.

[0007] In a preferred embodiment of the in-vehicle head-up display device for avoiding screen burn-in provided by this utility model, a control unit is provided on the drive motor, and the control unit is electrically connected to the temperature sensor.

[0008] In a preferred embodiment of the in-vehicle head-up display device for avoiding screen burn-in provided by this utility model, the temperature sensor is a thermistor.

[0009] In a preferred embodiment of the in-vehicle head-up display device for avoiding screen burn-in provided by this utility model, the temperature sensor is a negative temperature coefficient thermistor.

[0010] As a preferred embodiment of the in-vehicle head-up display device for avoiding screen burn-in provided by this utility model, there are 14 temperature sensors.

[0011] In a preferred embodiment of the in-vehicle head-up display device for avoiding screen burn-in provided by this utility model, the spacing between each adjacent temperature sensor is equal.

[0012] In a preferred embodiment of the in-vehicle head-up display device for avoiding screen burn-in provided by this utility model, multiple temperature sensors are connected in parallel.

[0013] As a preferred embodiment of the in-vehicle head-up display device for avoiding screen burn-in provided by this utility model, an FPC is provided on the back of the second freeform mirror, and the temperature sensor is disposed on the FPC.

[0014] This invention provides a car that includes an in-vehicle head-up display device as described in any of the preceding claims to prevent screen burn-in.

[0015] This utility model has the following beneficial effects: First, the focal point of the first freeform surface mirror is measured. Then, the temperature sensor is placed on the focal point of the first freeform surface mirror on the backlight surface of the second freeform surface mirror. Since the first freeform surface mirror can be deflected along the axis, its focal point is on a straight line. Therefore, several temperature sensors need to be placed and arranged in a straight line. This straight line overlaps with the line of the focal point of the first freeform surface mirror. When the temperature at the location of a certain temperature sensor is detected to be high and reaches the warning value, the angle of the first freeform surface mirror can be adjusted to deflect it, thereby changing its focal point on the TFT display module and avoiding screen burn-in. Only in this way can the actual temperature at the focal point of the vehicle head-up display device be accurately measured. Attached Figure Description

[0016] To more clearly illustrate the solutions in this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a structural schematic diagram of a vehicle head-up display device that avoids screen burn-in, as provided by this utility model.

[0018] Figure 2 This is a schematic diagram of the principle of a vehicle head-up display device that avoids screen burn-in, as provided by this utility model.

[0019] Figure 3 for Figure 2 A schematic diagram of the structure of the second freeform mirror.

[0020] Figure 4 for Figure 1 A schematic diagram of the structure after hiding some parts of the structure.

[0021] Explanation of icon numbers: First freeform surface mirror 1; second freeform surface mirror 2; TFT display module 3; temperature sensor 4; drive motor 5. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0023] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] This invention provides a vehicle head-up display device that avoids screen burn-in. It includes a first freeform surface mirror, a second freeform surface mirror, and a TFT display module arranged sequentially according to the light propagation path. The first freeform surface mirror can be deflected along the axial direction. Under the illumination of parallel light and the deflection of the first freeform surface mirror, numerous possible focal points are formed on the second freeform surface mirror arranged in a straight line. Multiple temperature sensors are arranged on the back surface of the second freeform surface mirror, and the multiple temperature sensors are arranged sequentially on the possible focal points.

[0026] First, the focal point of the first freeform surface mirror is measured. Then, the temperature sensor is placed on the focal point of the first freeform surface mirror on the backlight surface of the second freeform surface mirror. Since the first freeform surface mirror can be deflected along the axis, its focal point is on a straight line. Therefore, several temperature sensors need to be placed and arranged in a straight line. This straight line overlaps with the line of the focal point of the first freeform surface mirror. When the temperature at the location of a certain temperature sensor is detected to be high and reaches the warning value, the angle of the first freeform surface mirror can be adjusted to deflect it, thereby changing its focal point on the TFT display module and avoiding screen burn-in. Only in this way can the actual temperature at the focal point of the vehicle head-up display device be accurately measured.

[0027] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. The present invention will be described in detail below with reference to the accompanying drawings and embodiments, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0028] Example 1, please refer to Figures 1 to 4This invention provides a vehicle head-up display device to avoid screen burn-in, comprising a first freeform surface mirror 1, a second freeform surface mirror 2, and a TFT display module 3 arranged sequentially according to the light propagation path. The first freeform surface mirror 1 can be deflected along the axial direction. Under the illumination of parallel light and the deflection of the first freeform surface mirror 1, numerous possible focal points are formed on the second freeform surface mirror 2 arranged in a straight line. Multiple temperature sensors 4 are arranged on the backlight surface of the second freeform surface mirror 2, and the multiple temperature sensors 4 are arranged sequentially on the possible focal points. First, the focal point of the first freeform mirror 1 is measured. Then, the temperature sensor 4 is placed on the focal point of the first freeform mirror 1 on the backlight surface of the second freeform mirror 2. Since the first freeform mirror 1 can be deflected along the axis, its focal point is on a straight line. Therefore, multiple temperature sensors 4 need to be placed and arranged in a straight line. This straight line overlaps with the straight line of the focal point of the first freeform mirror 1. When the temperature at the location of a certain temperature sensor 4 is detected to be high and reaches the warning value, the angle of the first freeform mirror 1 can be adjusted to deflect it, thereby changing its focal point on the TFT display module 3 and avoiding screen burn-in. Only in this way can the actual temperature at the focal point of the vehicle head-up display device be accurately measured.

[0029] Example 2, please refer to Figures 1 to 4 As a further optimization of Embodiment 1, in this embodiment, a drive motor 5 is provided on the first freeform mirror 1. The drive motor 5 can drive the first freeform mirror 1 to deflect along the axial direction. The rotation of the first freeform mirror 1 is driven by the motor so that its focal point avoids the TFT display module 3, thereby avoiding the screen burn-in phenomenon caused by a rapid increase in temperature.

[0030] Furthermore, a control unit is provided on the drive motor 5. The control unit is electrically connected to the temperature sensor 4. When the control unit receives a signal from the temperature sensor 4 that the temperature is too high, it controls the first freeform mirror 1 to deflect so that its focal point avoids the TFT display module 3, thereby preventing the temperature from becoming too high.

[0031] Furthermore, the temperature sensor 4 is a thermistor; in this embodiment, the temperature sensor 4 is a negative temperature coefficient thermistor.

[0032] Furthermore, there are 14 temperature sensors 4, and the spacing between each adjacent temperature sensor 4 is equal, and multiple temperature sensors 4 are arranged in parallel.

[0033] Furthermore, an FPC is provided on the back of the second freeform mirror 2, and a temperature sensor 4 is disposed on the FPC.

[0034] This invention provides a car that includes an in-vehicle head-up display device as described in any of the preceding claims to prevent screen burn-in.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] Obviously, the embodiments described above are only some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application. This application can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this application.

Claims

1. A vehicle-mounted head-up display device that avoids screen burn-in, characterized in that, It includes a first freeform surface mirror, a second freeform surface mirror, and a TFT display module arranged sequentially according to the light propagation path. The first freeform surface mirror can be deflected along the axial direction. Under the illumination of parallel light and the deflection of the first freeform surface mirror, numerous possible focal points are formed on the second freeform surface mirror arranged in a straight line. Multiple temperature sensors are arranged on the back surface of the second freeform surface mirror, and the multiple temperature sensors are arranged sequentially on the possible focal points.

2. The in-vehicle head-up display device for avoiding screen burn-in according to claim 1, characterized in that, A drive motor is provided on the first freeform mirror, which can drive the first freeform mirror to deflect along the axial direction.

3. The vehicle head-up display device for avoiding screen burn-in according to claim 2, characterized in that, The drive motor is equipped with a control unit, which is electrically connected to the temperature sensor.

4. The vehicle head-up display device for avoiding screen burn-in according to claim 1, characterized in that, The temperature sensor is a thermistor.

5. The vehicle head-up display device for avoiding screen burn-in according to claim 3, characterized in that, The temperature sensor is a negative temperature coefficient thermistor.

6. The vehicle head-up display device for avoiding screen burn-in according to claim 1, characterized in that, There are 14 temperature sensors.

7. The vehicle head-up display device for avoiding screen burn-in according to claim 1, characterized in that, The spacing between each adjacent temperature sensor is equal.

8. The vehicle head-up display device for avoiding screen burn-in according to claim 1, characterized in that, Multiple temperature sensors are connected in parallel.

9. The vehicle head-up display device for avoiding screen burn-in according to claim 1, characterized in that, The back of the second freeform mirror is provided with an FPC, and the temperature sensor is disposed on the FPC.

10. A car, characterized in that, It includes a vehicle head-up display device that avoids screen burn-in as described in any one of claims 1-9.

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