HUD temperature detection method

Abstract

The invention discloses an HUD temperature detection method. A photosensitive sensor and a temperature sensor are included. The method further comprises the following steps: S1, setting an illumination threshold E0, a first temperature threshold T01, a second temperature threshold T02 and a third temperature threshold T03; s2, starting, and detecting the illumination brightness of the secondary curved mirror in real time; s3, the temperature T1 of the surface of the display screen is detected, and the temperature T1 is compared with a first temperature threshold T01; s4, the HUD is adjusted; s4-1, adjusting the display brightness of the display screen; s4-2, detecting the temperature T2 of the surface of the display screen after the brightness is reduced; comparing the temperature T2 after the brightness is reduced with a second temperature threshold value T02; s4-3, turning off the display screen; s4-4, adjusting the angle of the main curved mirror; s4-5, detecting the temperature T3 of the surface of the display screen after the display screen is turned off; comparing the temperature T3 after the display screen is turned off with a third temperature threshold T03; s4-6, the controller starts the display screen; and S5, ending the adjustment. The temperature on the display screen can be accurately measured, the display screen can be adjusted, and stable operation of the display screen is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle-mounted displays, and in particular relates to a HUD temperature detection method. Background Art

[0002] The vehicle-mounted HUD was first used in aviation, and was designed to allow pilots to check instrument-related information without looking down. With the development of science and technology, this technology has been widely used in automobiles, and has gone through the development of CHUD (Combiner Head Up Display), WHUD (Windshield Head Up Display) and ARHUD (Augmented Reality Head Up Display). Compared with CHUD and WHUD, ARHUD has the characteristics of large FOV (Field Of View) and long VID (Virtual Distance). The increase in FOV and VID will lead to an increase in the virtual image display screen, which can enhance the fusion of reality and virtual effects. However, the increase in FOV will lead to an increase in the HUD window, and the amount of sunlight entering the HUD in the reverse direction will increase when sunlight backflow occurs. When the size of the PGU display screen is fixed, when the virtual image display screen increases, the corresponding optical magnification will increase, and the light spots will be more concentrated when the sunlight flows back. The light spots gathered on the PGU screen will quickly cause the temperature of the screen to rise sharply. In severe cases, it will cause obvious burning phenomenon and burn the screen. At present, many patents have proposed some detection methods and corresponding countermeasures for these situations, but there are problems such as inaccurate detection and untimely detection, which lead to the early occurrence of protection measurement rate or delayed execution.

[0003] Chinese patent CN114061790A discloses a method for detecting the temperature of a head-up display PGU, and CN22096225U discloses a temperature control device for preventing sunlight from flowing back into a HUD. Both devices have problems such as inaccurate detection and untimely detection, which results in premature or delayed implementation of protective measures. Similarly, Chinese patent CN110908124A discloses a HUD optical path system and its control method, and a HUD display device, and specifically discloses that the temperature on the TFT screen is detected by using a photosensitive sensor on a secondary curved mirror and a temperature sensor on the FPC cable of the TFT screen. Since the temperature sensor on the FPC cable of the TFT screen is not on the TFT screen, when sunlight flows back and the temperature on the TFT screen is already locally very high, the temperature rise of the temperature sensor on the FPC cable does not change significantly and may even fail sometimes. The most critical thing is that when the temperature inside the HUD is not dissipated in time, the temperature sensor on the FPC cable will collect the overall accumulated temperature rise inside the HUD, rather than the temperature on the TFT screen. Summary of the invention

[0004] The present invention proposes a HUD temperature detection method, which can accurately measure the temperature on the display screen and adjust the display screen to ensure stable operation of the display screen.

[0005] To this end, the technical solution adopted by the present invention is: a HUD temperature detection method, comprising a detection system, the detection system comprising a flexible circuit board arranged between a display screen and an upper cover and a photosensitive sensor arranged on a secondary curved mirror, wherein a plurality of temperature sensors in contact with the display screen and used to measure the surface temperature of the display screen are arranged at intervals on the flexible circuit board;

[0006] The following steps are also included:

[0007] S1: Setting the illumination threshold E0, the first temperature threshold T01, the second temperature threshold T02 and the third temperature threshold T03;

[0008] S2: The car starts, and the light brightness at the secondary curved mirror is detected in real time. If it does not exceed the light threshold E0, this step is repeated. If it exceeds the light threshold E0, the next step is performed;

[0009] S3: Detect the temperature T1 of the display screen surface in real time through the temperature sensor, send the detected temperature T1 to the controller through the temperature sensor, and compare the temperature T1 with the set first temperature threshold T01 through the controller;

[0010] If the detected temperature T1> the first temperature threshold T01, then execute S4, otherwise, repeat this step;

[0011] S4: Adjust the HUD through the controller;

[0012] S4-1: The controller adjusts the display brightness of the display screen;

[0013] S4-2: re-detecting the temperature T2 of the display screen surface after the brightness is reduced through the temperature sensor; sending the temperature T2 after the brightness is reduced to the controller through the temperature sensor, and comparing the temperature T2 after the brightness is reduced with the set second temperature threshold T02 through the controller;

[0014] If the temperature T2 after the brightness is reduced is greater than the second temperature threshold T02, then execute S4-3, otherwise repeat this step;

[0015] S4-3: The controller turns off the display screen;

[0016] S4-4: adjust the angle of the main curved mirror;

[0017] S4-5: re-detecting the temperature T3 of the display screen surface after it is turned off through the temperature sensor; sending the temperature T3 of the display screen after it is turned off to the controller through the temperature sensor, and comparing the temperature T3 of the display screen after it is turned off with the set third temperature threshold T03 through the controller; if the temperature T3 of the display screen after it is turned off is ≥ the set third temperature threshold T03, executing step S4-4; if the temperature T3 of the display screen after it is turned off is < the set third temperature threshold T03, executing the next step;

[0018] S4-6: The controller starts the display screen and drives the display screen to display according to the reduced brightness;

[0019] S5: End the adjustment.

[0020] Further preferably, step S2 further comprises: detecting the light brightness E at the secondary curved mirror in real time by means of a photosensitive sensor, and sending the detected light brightness E to a controller by means of the photosensitive sensor, and comparing the light brightness E with a set light threshold E0 by means of the controller;

[0021] If the light sensitivity brightness E>light threshold E0, then execute S3, otherwise repeat this step.

[0022] Further preferably, a fixing pad for fixing the flexible circuit board is provided between the flexible circuit board and the upper cover, and a notch for installing the flexible circuit board is provided on the upper cover.

[0023] Further preferably, the upper cover is arranged on the mounting bracket through a third mounting structure, a display channel which passes through from top to bottom is arranged on the mounting bracket, a display screen groove for placing the display screen is arranged at the upper end of the display channel on the mounting bracket, and the outer side of the display screen groove is located outside the upper end of the display channel.

[0024] Further preferably, the third mounting structure includes a positioning protrusion at least arranged on either side surface of the mounting bracket, a positioning groove is arranged at a position corresponding to the positioning protrusion on the upper cover, a second clamping protrusion is arranged on two opposite side surfaces of the mounting bracket, and a second clamping protrusion that can be buckled on the second clamping protrusion is arranged at a position corresponding to the second clamping protrusion on the upper cover.

[0025] Further preferably, the mounting bracket is arranged on the reflective seat through a second mounting structure, a substrate for mounting a backlight source is arranged below the reflective seat, an optical channel for light to pass through is arranged on the reflective seat, and a mounting groove for mounting a diffusion component is arranged at the upper end of the reflective seat, and the outer side of the mounting groove is located outside the upper end of the optical channel.

[0026] Further preferably, the second mounting structure includes a third mounting ear arranged on any two opposite side surfaces of the upper end of the reflective seat, a fourth mounting ear is arranged at a position corresponding to the third mounting ear at the bottom of the mounting bracket, a second positioning column is arranged on the third mounting ear, a second positioning hole for inserting the second positioning column is arranged on the fourth mounting ear, a second bolt through hole for passing a bolt is arranged on the fourth mounting ear, and the third mounting ear is provided with a second threaded blind hole for tightening the bolt and corresponding to the second bolt through hole.

[0027] Further preferably, a second diffusion sheet located in the groove of the display screen is provided below the display screen.

[0028] Further preferably, the fixing pad is made of foam with temperature resistance.

[0029] Beneficial effects of the present invention: a temperature sensor for measuring the temperature of the display screen is provided, which works together with the photosensitive sensor provided on the secondary curved mirror to adjust the display brightness of the display screen itself in turn, and reduce the heat generated by itself during the display process. If the temperature is still too high, the inclination angle of the primary curved mirror is adjusted to adjust the reflection angle of the external light source, and the external light source is avoided from irradiating the display as much as possible, and the heat generated by the external light source is reduced, so that the display screen is displayed within the set temperature range. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the process of the present invention.

[0031] Figure 2 It is the installation schematic diagram of the present invention.

[0032] Figure 3 It is a schematic diagram of the mounting bracket in the present invention.

[0033] Figure 4 It is a schematic diagram of the upper cover in the present invention.

[0034] Figure 5 Schematic diagram of a display equipped with the present invention Figure 1 .

[0035] Figure 6 Schematic diagram of a display equipped with the present invention Figure 2 .

[0036] Figure 7 Schematic diagram of a diffusion component in a display equipped with the present invention.

[0037] Figure 8 A schematic diagram of a reflective seat in a display equipped with the present invention.

[0038] Fig. 9 A schematic diagram of a first reflective member in a display according to the present invention.

[0039] Fig.10 A schematic diagram of a second reflective member in a display according to the present invention.

[0040] Figure numerals: reflective seat-A, display component-B, diffusion component-C, temperature detection device-D, light channel-a, mounting groove-b, third mounting ear-d, second positioning column-e, second threaded blind hole-f, mounting hole-g, substrate-1, first reflector-2, light groove-2a, first mounting ear-2b, first positioning column-2c, first threaded blind hole-2d, first clamping protrusion-2e, second reflector-3, second mounting ear-3a, second positioning hole-3b, first bolt through hole-3c, first buckle-3d, lens-4, first diffuser-5, Mounting bracket-6, display channel-6a, display screen slot-6b, fourth mounting ear-6c, second positioning hole-6d, second bolt through hole-6e, positioning protrusion-6f, second snap-on protrusion-6g, display screen-7, upper cover-8, display slot-8a, positioning groove-8b, second buckle-8c, notch-8d, second diffuser-9, flexible circuit board-10, temperature sensor-11, fixing pad-12, backlight source-13, radiator-14, main curved mirror 15, secondary curved mirror 16, photosensor 17, windshield 18, external light source 19. DETAILED DESCRIPTION

[0041] The present invention will be further described below by way of embodiments and in conjunction with the accompanying drawings:

[0042] like Figure 1-Figure 10As shown, a HUD temperature detection method includes a detection system, and the detection system is arranged in the display. And the display 7 is mainly composed of a reflector A, a display component B and a diffusion component C. Among them, the reflector A is used for the installation of the entire display, and a mounting hole g for fixing the entire display is arranged on the reflector A. A substrate 1 for installing a backlight source 13 is arranged below the reflector A, and an optical channel a for the backlight source light to pass through is arranged on the reflector A. The diffusion component C is arranged on the optical channel a to realize the diffusion of the backlight source light. The display component B is arranged above the reflector A for realizing the display of the image.

[0043] The display assembly B includes a mounting bracket 6 mounted on the reflective seat A through a second mounting structure, a display channel 6a that runs through the upper and lower parts and allows light to pass through is arranged on the mounting bracket 6, a display screen groove 6b for placing the display screen 7 is arranged on the mounting bracket 6 at the upper end of the display channel 6a, and the outer side of the display screen groove 6b is located outside the upper end of the display channel 6a, an upper cover 8 for fixing the display screen 7 is arranged on the mounting bracket 6 through a third mounting structure, and a display groove 8a for the display screen 7 to leak out is arranged on the upper cover 8.

[0044] The second mounting structure includes a third mounting lug d provided on any two opposite sides of the upper end of the reflective seat A. Correspondingly, a fourth mounting lug 6c is provided at a position corresponding to the third mounting lug d at the bottom of the mounting bracket 6. A second positioning column e is provided on the third mounting lug d. Correspondingly, a second positioning hole 6d for inserting the second positioning column e is provided on the fourth mounting lug 6c. A second bolt through hole 6e for bolts to pass through is provided on the fourth mounting lug 6c. Correspondingly, a second threaded blind hole f for tightening the bolts and corresponding to the second bolt through hole 6e is provided on the third mounting lug d. During installation, the second positioning column is inserted into the corresponding second positioning hole, and then the bolts are tightened to achieve positioning installation.

[0045] The third mounting structure includes a positioning protrusion 6f at least provided on either side of the mounting bracket 6, and correspondingly, a positioning groove 8b is provided at a position corresponding to the positioning protrusion 6f on the upper cover 8. Second clamping protrusions 6g are provided on two opposite sides of the mounting bracket 6, and correspondingly, a second clamping buckle 8c capable of buckling on the second clamping protrusion 6g is provided at a position corresponding to the second clamping protrusion 6g on the upper cover 8. During installation, the positioning protrusion is inserted into the corresponding positioning groove, and then the second clamping buckle is buckled on the second clamping protrusion to achieve positioning installation. Preferably, part of the positioning protrusion is provided at the same position as the fourth mounting lug, so that the positioning protrusion can serve as a reinforcing rib of the fourth mounting lug.

[0046] Since the display channel is also configured to be larger at the top and smaller at the bottom, it is best to provide a second diffusion sheet 9 located in the display screen groove 6 b below the display screen 7 .

[0047] The detection system includes a temperature detection device D, which includes a flexible circuit board 10 arranged between the display screen 7 and the upper cover 8 and a photosensitive sensor 17 arranged on the secondary curved mirror 16 for detecting the light intensity on the secondary curved mirror 16. A plurality of temperature sensors 11 in contact with the display screen 7 and used to measure the surface temperature of the display screen 7 are arranged on the flexible circuit board 10 at intervals. A fixing pad 12 for fixing the flexible circuit board 10 is arranged between the flexible circuit board 10 and the upper cover 8. At the same time, a notch 8d for installing the flexible circuit board 10 is arranged on the upper cover 8. The temperature of the display screen is ensured to be within a suitable range through the combined action of the photosensitive sensor 17 and the temperature sensor. Preferably, the fixing pad is made of high temperature resistant foam, and the number of flexible circuit boards 10 is set according to needs.

[0048] In order to facilitate the processing of the light channel, the reflector seat A includes a first reflector 2 and a second reflector 3 which are mounted together through a first mounting structure. A tapered light groove 2a which is through from top to bottom and larger at the top and smaller at the bottom is provided on the first reflector 2, and the light groove is an open groove. A first reflecting surface 2a is provided on the side wall of the light groove 2a, and a second reflecting surface is provided at a position corresponding to the light groove 2a on the second reflector 3. When the first reflector 2 and the second reflector 3 are mounted together through the first mounting structure, the first reflecting surface and the second reflecting surface form a light channel a for light to pass through.

[0049] The first mounting structure includes a first mounting lug 2b disposed on two opposite sides of the first reflector 2, and a second mounting lug 3a disposed at a position corresponding to the first mounting lug 2b on the second reflector 3. A first positioning column 2c is disposed on the first mounting lug 2b, and correspondingly, a second positioning hole 3b for the first positioning column 2c to pass through is disposed on the second mounting lug 3a. A first bolt through hole 3c for a tightening bolt to pass through is disposed on the second mounting lug 3a, and correspondingly, a first threaded blind hole 2d for tightening the bolt and corresponding to the first bolt through hole 3c is disposed on the first mounting lug 2b. A first clamping protrusion 2e for preliminary installation is disposed on the first reflector 2, and correspondingly, a first buckle 3d capable of buckling on the first clamping protrusion 2e is disposed at a position corresponding to the first clamping protrusion 2e on the second reflector 3.

[0050] Preferably, the first buckle and the first bolt through hole are located at the upper and lower sides of the first positioning column. When installing the first reflector and the second reflector, first insert the first mounting column into the corresponding first mounting hole, then clamp the first buckle on the first clamping protrusion to achieve the preliminary fixation of the first reflector and the second reflector, and finally pass the bolt through the first bolt through hole and tighten it in the first threaded blind hole to achieve the fixation of the first reflector and the second reflector. In order to ensure the sealing of the first reflector and the second reflector, the second mounting lug is arranged on the second reflector by bending toward the first reflector, and the corresponding first mounting lug is arranged in the middle of the side of the first reflector.

[0051] The diffusion assembly C includes a lens 4 and a first diffusion sheet 5, wherein the first diffusion sheet 5 is used to diffuse the light of the backlight source, and the lens 4 is used to filter the diffused light. A mounting groove b for mounting the diffusion assembly C is provided at the upper end of the reflective seat A, and the outer side of the mounting groove b is located outside the upper end of the light channel a, and the lens 4 and the first diffusion sheet 5 are stacked up and down in the mounting groove b.

[0052] The following steps are also included:

[0053] S1: Setting the illumination threshold E0, the first temperature threshold T01, the second temperature threshold T02 and the third temperature threshold T03;

[0054] S2: The car starts, and the light brightness at the secondary curved mirror 16 is detected in real time. If it does not exceed the light threshold E0, this step is repeated. If it exceeds the light threshold E0, the next step is performed;

[0055] Step S2 also includes: detecting the light sensitivity brightness E at the secondary curved mirror 16 in real time through the photosensitive sensor 17, and sending the detected light sensitivity brightness E to the controller through the photosensitive sensor 17, and comparing the light sensitivity brightness E with the set light threshold E0 through the controller;

[0056] If the light sensitivity brightness E>light threshold E0, then execute S3, otherwise repeat this step.

[0057] S3: Detect the temperature T1 of the surface of the display screen 7 in real time through the temperature sensor 11, and send the detected temperature T1 to the controller through the temperature sensor 11, and compare the temperature T1 with the set first temperature threshold T01 through the controller;

[0058] If the detected temperature T1> the first temperature threshold T01, then execute S4, otherwise, repeat this step;

[0059] S4: Adjust the HUD through the controller;

[0060] S4-1: The controller adjusts the display brightness of the display screen 7 to reduce the heat generated by the display screen 7 itself;

[0061] S4-2: re-detecting the temperature T2 of the surface of the display screen 7 after the brightness is reduced through the temperature sensor 11; sending the temperature T2 after the brightness is reduced to the controller through the temperature sensor 11, and comparing the temperature T2 after the brightness is reduced with the set second temperature threshold T02 through the controller;

[0062] If the temperature T2 after the brightness is reduced is greater than the second temperature threshold T02, then execute S4-3, otherwise repeat this step;

[0063] S4-3: The controller turns off the display screen 7;

[0064] S4-4: The controller drives the motor of the main curved mirror 15 to rotate and adjust the angle of the main curved mirror 15; since the external light source 19 will pass through the windshield 18 and be reflected by the main curved mirror 15 and the secondary curved mirror 16 to the display screen 7, the surface temperature of the display screen 7 will be too high. The reflection angle of the external light source 19 is adjusted to reduce the temperature of the display screen 7 irradiated by the external light source 19 as much as possible.

[0065] S4-5: re-detecting the temperature T3 of the surface of the display screen 7 after it is turned off through the temperature sensor 11; and sending the temperature T3 of the display screen 7 after it is turned off to the controller through the temperature sensor, and comparing the temperature T3 of the display screen 7 after it is turned off with the set third temperature threshold T03 through the controller; at this time, the temperature sensor 11 detects the temperature generated by the external light source 19;

[0066] If the temperature T3 after the display screen 7 is turned off is greater than or equal to the set third temperature threshold T03, it means that the temperature generated by the external light source 19 is too high, and step S4-4 is repeated until the temperature T3 after the display screen 7 is turned off is less than the set third temperature threshold T03, and then the next step is executed;

[0067] S4-6: The controller starts the display screen 7 and drives the display screen 7 to display according to the reduced brightness;

[0068] S5: End the adjustment.

Claims

1. A HUD temperature detection method, characterized in that: The detection system comprises a flexible circuit board (10) arranged between a display screen (7) and an upper cover (8) and a photosensitive sensor (17) arranged on a secondary curved mirror (16); a plurality of temperature sensors (11) in contact with the display screen (7) and used to measure the surface temperature of the display screen (7) are arranged on the flexible circuit board (10) at intervals; The following steps are also included: S1: Setting the illumination threshold E0, the first temperature threshold T01, the second temperature threshold T02 and the third temperature threshold T03; S2: The car starts, and the light brightness at the secondary curved mirror (16) is detected in real time. If it does not exceed the light threshold E0, this step is repeated. If it exceeds the light threshold E0, the next step is performed; S3: Detecting the temperature T1 of the surface of the display screen (7) in real time through the temperature sensor (11), and sending the detected temperature T1 to the controller through the temperature sensor (11), and comparing the temperature T1 with a set first temperature threshold T01 through the controller; If the detected temperature T1> the first temperature threshold T01, then execute S4, otherwise, repeat this step; S4: Adjust the HUD through the controller; S4-1: The controller adjusts the display brightness of the display screen (7); S4-2: re-detecting the temperature T2 of the surface of the display screen (7) after the brightness is reduced through the temperature sensor (11); and sending the temperature T2 after the brightness is reduced to the controller through the temperature sensor (11), and the controller compares the temperature T2 after the brightness is reduced with a set second temperature threshold T02; If the temperature T2 after the brightness is reduced is greater than the second temperature threshold T02, then execute S4-3, otherwise repeat this step; S4-3: The controller turns off the display screen (7); S4-4: adjusting the angle of the main curved mirror (15); S4-5: re-detecting the temperature T3 of the surface of the display screen (7) after it is turned off through the temperature sensor (11); and sending the temperature T3 of the display screen (7) after it is turned off to the controller through the temperature sensor, and comparing the temperature T3 of the display screen (7) after it is turned off with the set third temperature threshold T03 through the controller; if the temperature T3 of the display screen (7) after it is turned off is greater than or equal to the set third temperature threshold T03, then executing step S4-4; if the temperature T3 of the display screen (7) after it is turned off is less than the set third temperature threshold T03, then executing the next step; S4-6: the controller starts the display screen (7) and drives the display screen (7) to display according to the reduced brightness; S5: End the adjustment.

2. The HUD temperature detection method according to claim 1, characterized in that: Step S2 also includes: detecting the light sensitivity brightness E at the secondary curved mirror (16) in real time through the photosensitive sensor (17), sending the detected light sensitivity brightness E to the controller through the photosensitive sensor (17), and comparing the light sensitivity brightness E with a set light threshold E0 through the controller; If the light sensitivity brightness E>light threshold E0, then execute S3, otherwise repeat this step.

3. The HUD temperature detection method according to claim 1, characterized in that: A fixing pad (12) for fixing the flexible circuit board (10) is arranged between the flexible circuit board (10) and the upper cover (8), and a notch (8d) for installing the flexible circuit board (10) is arranged on the upper cover (8).

4. The HUD temperature detection method according to claim 1, characterized in that: The upper cover (8) is arranged on the mounting bracket (6) through a third mounting structure; a display channel (6a) penetrating from top to bottom is arranged on the mounting bracket (6); a display screen groove (6b) for accommodating a display screen (7) is arranged on the mounting bracket (6) at the upper end of the display channel (6a); and the outer side of the display screen groove (6b) is located outside the upper end of the display channel (6a).

5. The HUD temperature detection method according to claim 4, characterized in that: The third mounting structure comprises a positioning protrusion (6f) at least arranged on either side surface of the mounting bracket (6); a positioning groove (8b) is arranged on the upper cover (8) at a position corresponding to the positioning protrusion (6f); a second snap-fitting protrusion (6g) is arranged on two opposite side surfaces of the mounting bracket (6); and a second snap-fitting (8c) capable of snapping onto the second snap-fitting protrusion (6g) is arranged on the upper cover (8) at a position corresponding to the second snap-fitting protrusion (6g).

6. The HUD temperature detection method according to claim 4, characterized in that: The mounting bracket (6) is arranged on the reflective seat through a second mounting structure, a substrate (1) for mounting a backlight source (13) is arranged below the reflective seat (A), a light channel (a) for light to pass through is arranged on the reflective seat (A), and a mounting groove (b) for mounting a diffusion component (C) is arranged at the upper end of the reflective seat (A), and the outer side of the mounting groove (b) is located outside the upper end of the light channel (a).

7. The HUD temperature detection method according to claim 6, characterized in that: The second mounting structure comprises a third mounting lug (d) arranged on any two opposite side surfaces of the upper end of the reflective seat (A); a fourth mounting lug (6c) is arranged at a position corresponding to the third mounting lug (d) at the bottom of the mounting bracket (6); a second positioning column (e) is arranged on the third mounting lug (d); a second positioning hole (6d) for inserting the second positioning column (e) is arranged on the fourth mounting lug (6c); a second bolt through hole (6e) for a bolt to pass through is arranged on the fourth mounting lug (6c); and a second threaded blind hole (f) for tightening the bolt and corresponding to the second bolt through hole (6e) is arranged on the third mounting lug (d).

8. The HUD temperature detection method according to claim 4, characterized in that: A second diffusion sheet (9) located in the display screen groove (6b) is provided below the display screen (7).

9. The HUD temperature detection method according to claim 3, characterized in that: The fixing pad (12) is made of foam with temperature resistance.

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