Head-up display ambient light circuit, head-up display display device and vehicle

Abstract

The utility model relates to the technical field of vehicle head-up displays, in particular to a head-up display ambient light circuit, a head-up display display device and a vehicle, and the head-up display ambient light circuit comprises an ambient light sensor module, a pull-up module and a micro-control unit, the ambient light sensor module is respectively connected with the power supply voltage and the micro-control unit, one end of the pull-up module is connected with the power supply voltage, and the other end is connected between the ambient light sensor module and the micro-control unit; the ambient light sensor module is used for sensing the intensity of ambient light and transmitting the intensity of the ambient light to the micro-control unit, and the micro-control unit adjusts the backlight intensity of the head-up display according to the intensity of the ambient light. According to the utility model, the suppression device is added in the power supply voltage circuit, thereby reducing the problem of large outward emission interference; and the display device of the head-up display can automatically lighten or dim the backlight according to the intensity of the ambient light.

Description

Technical Field

[0001] This utility model relates to the field of vehicle head-up display technology, and in particular to a head-up display ambient light circuit, a head-up display display device, and a vehicle. Background Technology

[0002] The purpose of a vehicle head-up display (HUD) is to project important driving-related information onto the windshield, reducing distraction and improving safety. Because ambient light levels vary significantly during vehicle operation, HUDs need to adjust their brightness according to the ambient light to achieve the best visual effect. Currently, common HUD ambient light application module circuits emit significant interference, easily interfering with nearby wireless devices and potentially exceeding EMC limits. For example, Chinese patent CN107560728A – an ambient light detection circuit for HUDs – uses a phototransistor to collect ambient light, enabling automatic backlight adjustment for the HUD. However, its potential source of electromagnetic interference is the emission of external interference. Furthermore, to achieve a large dynamic range of ambient light detection, this patent uses a single sensor to collect two signals. These signals may cross-interact due to capacitive coupling or ground loop interference. The amplified signal path is susceptible to external electromagnetic interference, leading to abnormal values ​​collected by the MCU. Therefore, the circuit stability of this patent is also relatively poor. Furthermore, the response time of a phototransistor is slower than that of a photodiode, which may cause a delay in detection when there are rapid changes in light intensity (such as when entering or exiting a tunnel), resulting in a lag in HUD brightness adjustment. Utility Model Content

[0003] The technical problem to be solved by this utility model is: in order to overcome the above-mentioned technical problems, this utility model provides a head-up display ambient light circuit, a head-up display device, and a vehicle.

[0004] The technical solution adopted by this utility model to solve its technical problem is: an ambient light circuit for a head-up display, including an ambient light sensor module and a microcontroller unit. The ambient light sensor module is used to sense the intensity of ambient light and transmit the ambient light intensity signal to the microcontroller unit. The microcontroller unit is used to adjust the backlight intensity of the head-up display according to the intensity of the ambient light. The circuit also includes a pull-up module and a power supply voltage circuit. The ambient light sensor module is connected to both the power supply voltage circuit and the microcontroller unit. One end of the pull-up module is connected to the power supply voltage circuit, and the other end is connected between the ambient light sensor module and the microcontroller unit. The ambient light sensor module includes a photodiode with an anti-reflective coating on its surface. For example, the anti-reflective coating can be a silicon dioxide (SiO2) anti-reflective coating to reduce light reflection loss and improve light absorption efficiency.

[0005] The power supply voltage circuit includes a power supply voltage source and a suppression device, wherein the power supply voltage source outputs voltage through the suppression device.

[0006] The suppression device includes a magnetic bead FB1, which is connected in series in the output circuit of the power supply voltage source.

[0007] The magnetic bead FB1 has a magnetic bead value of 120R.

[0008] The ambient light sensor module is model SFH-5721.

[0009] The ambient light sensor module includes a first pin, a second pin, a third pin, a fourth pin, a fifth pin, and a sixth pin; the microcontroller unit includes a first pin, a second pin, a third pin, and a fourth pin.

[0010] The fourth, fifth, and sixth pins of the ambient light sensor module are respectively connected to the third, second, and first pins of the microcontroller unit.

[0011] The fourth pin of the ambient light sensor module is a terminal signal port, and the third pin of the microcontroller is a general-purpose input / output port; the fifth and sixth pins of the ambient light sensor module are I2C communication pins, and the first and second pins of the microcontroller are I2C communication pins.

[0012] The ambient light circuit of the head-up display of this utility model also includes a filtering unit. The first end of the filtering unit is connected to the power supply voltage circuit and the first pin of the ambient light sensor module. The second end of the filtering unit is grounded. The first pin of the ambient light sensor module is the power supply terminal.

[0013] The filtering unit includes two filter capacitors connected in parallel.

[0014] The capacitance values ​​of the two filter capacitors are 4.7uF and 100nF, respectively.

[0015] The pull-up module includes a first pull-up resistor, a second pull-up resistor, and a third pull-up resistor;

[0016] One end of the first pull-up resistor is connected to the power supply voltage circuit, and the other end of the first pull-up resistor is connected to the sixth pin of the ambient light sensor module and the first pin of the microcontroller unit, respectively.

[0017] One end of the second pull-up resistor is connected to the power supply voltage circuit, and the other end of the second pull-up resistor is connected to the fifth pin of the ambient light sensor module and the second pin of the microcontroller unit, respectively.

[0018] One end of the third pull-up resistor is connected to the power supply voltage circuit, and the other end of the third pull-up resistor is connected to the fourth pin of the ambient light sensor module and the third pin of the microcontroller unit.

[0019] The resistance values ​​of the first pull-up resistor, the second pull-up resistor, and the third pull-up resistor are all 10KΩ.

[0020] The present invention provides a head-up display device, including a fixed lens and having the aforementioned head-up display ambient light circuit, wherein the head-up display ambient light circuit is fixed on the fixed lens.

[0021] The present invention relates to a head-up display device, wherein the entire fixed lens is wrapped with a transparent cold-coated film.

[0022] The present invention relates to a vehicle having the aforementioned head-up display device.

[0023] The present invention provides an ambient light circuit for a head-up display, a head-up display device, and a vehicle, which have the following beneficial effects:

[0024] (1) The ambient light sensor module can better sense the ambient light intensity through the anti-reflective coating on the surface of the photodiode, adapt to different ambient light, and improve the performance of the ambient light circuit of the head-up display.

[0025] (2) Add suppression devices to the power supply voltage circuit to reduce the problem of external emission interference;

[0026] (3) The entire fixed lens is coated with a transparent cold film, which can absorb external light and realize the photosensitive function through light;

[0027] (4) The ambient light circuit of the head-up display can automatically adjust the backlight to brighten or darken according to the intensity of the ambient light. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] Figure 1 This is a circuit diagram of the preferred embodiment of the ambient light circuit for the head-up display of this utility model. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0031] like Figure 1As shown, this utility model discloses an ambient light circuit for a head-up display (HUD), including an ambient light sensor module U1 and a microcontroller unit U2. The ambient light sensor module U1 senses the intensity of ambient light and transmits the intensity signal to the microcontroller unit U2. The microcontroller unit U2 adjusts the backlight intensity of the HUD according to the ambient light intensity. The circuit also includes a pull-up module and a power supply circuit. The ambient light sensor module U1 is connected to both the power supply circuit and the microcontroller unit U2. One end of the pull-up module is connected to the power supply circuit, and the other end is connected between the ambient light sensor module U1 and the microcontroller unit U2. The ambient light sensor module U1 includes a photodiode with an anti-reflective coating on its surface. For example, the anti-reflective coating can be a silicon dioxide (SiO2) anti-reflective coating to reduce light reflection loss and improve light absorption efficiency.

[0032] The power supply voltage circuit includes a power supply voltage source and a suppression device. The power supply voltage source outputs voltage through the suppression device.

[0033] The suppression device includes a ferrite bead FB1, which is connected in series in the output circuit of the power supply voltage source, and the output voltage of the power supply voltage source is 3.3V.

[0034] The magnetic bead value of FB1 is 120R.

[0035] The ambient light sensor module U1 is model number SFH-5721 from Osram.

[0036] The ambient light sensor module U1 includes a first pin, a second pin, a third pin, a fourth pin, a fifth pin, and a sixth pin; the microcontroller unit U2 includes a first pin, a second pin, a third pin, and a fourth pin.

[0037] Among them, the fourth, fifth and sixth pins of the ambient light sensor module U1 are connected to the third, second and first pins of the microcontroller U2, respectively;

[0038] The fourth pin of the ambient light sensor module U1 is the terminal signal port, and the third pin of the microcontroller U2 is the general-purpose input / output port; the fifth and sixth pins of the ambient light sensor module U1 are I2C communication pins, and the first and second pins of the microcontroller U2 are I2C communication pins.

[0039] The ambient light circuit of the head-up display of this utility model also includes a filtering unit. The first end of the filtering unit is connected to the power supply voltage circuit and the first pin of the ambient light sensor module U1. The second end of the filtering unit is grounded. The first pin of the ambient light sensor module U1 is the power supply terminal.

[0040] The filtering unit includes two filter capacitors C1 and C2 connected in parallel.

[0041] The capacitance values ​​of the two filter capacitors C1 and C2 are 4.7uF and 100nF, respectively.

[0042] The pull-up module includes a first pull-up resistor R1, a second pull-up resistor R2, and a third pull-up resistor R3;

[0043] One end of the first pull-up resistor R1 is connected to the power supply voltage circuit, and the other end of the first pull-up resistor R1 is connected to the sixth pin of the ambient light sensor module U1 and the first pin of the microcontroller unit U2, respectively.

[0044] One end of the second pull-up resistor R2 is connected to the power supply voltage circuit, and the other end of the second pull-up resistor R2 is connected to the fifth pin of the ambient light sensor module U1 and the second pin of the microcontroller unit U2, respectively.

[0045] One end of the third pull-up resistor R3 is connected to the power supply voltage circuit, and the other end of the third pull-up resistor R3 is connected to the fourth pin of the ambient light sensor module U1 and the third pin of the microcontroller unit U2, respectively.

[0046] The resistance values ​​of the first pull-up resistor R1, the second pull-up resistor R2, and the third pull-up resistor R3 are all 10KΩ.

[0047] The present invention relates to a head-up display device, comprising a fixed lens and having the ambient light circuit of the head-up display, the ambient light circuit being fixed on the fixed lens.

[0048] The present invention relates to a head-up display device, wherein the entire fixed lens is wrapped with a transparent cold-coated film.

[0049] This utility model relates to a vehicle equipped with a head-up display device.

[0050] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A head-up display ambient light circuit, comprising an ambient light sensor module and a microcontroller unit, wherein the ambient light sensor module is used to sense the intensity of ambient light and transmit the ambient light intensity signal to the microcontroller unit, and the microcontroller unit is used to adjust the backlight intensity of the head-up display according to the intensity of the ambient light, characterized in that: It also includes a pull-up module and a power supply voltage circuit. The ambient light sensor module is connected to the power supply voltage circuit and the microcontroller unit respectively. One end of the pull-up module is connected to the power supply voltage circuit, and the other end is connected between the ambient light sensor module and the microcontroller unit. The ambient light sensor module includes a photodiode with an anti-reflective coating on its surface.

2. The ambient light circuit for a head-up display as described in claim 1, characterized in that: The power supply voltage circuit includes a power supply voltage source and a suppression device, wherein the power supply voltage source outputs voltage through the suppression device.

3. The ambient light circuit for a head-up display as described in claim 2, characterized in that: The suppression device includes a magnetic bead FB1, which is connected in series in the output circuit of the power supply voltage source.

4. The ambient light circuit for a head-up display as described in claim 1, characterized in that: The ambient light sensor module is model SFH-5721; The ambient light sensor module includes a first pin, a second pin, a third pin, a fourth pin, a fifth pin, and a sixth pin; the microcontroller unit includes a first pin, a second pin, a third pin, and a fourth pin. The fourth, fifth, and sixth pins of the ambient light sensor module are respectively connected to the third, second, and first pins of the microcontroller unit. The fourth pin of the ambient light sensor module is a terminal signal port, and the third pin of the microcontroller is a general-purpose input / output port; the fifth and sixth pins of the ambient light sensor module are I2C communication pins, and the first and second pins of the microcontroller are I2C communication pins.

5. The ambient light circuit for a head-up display as described in claim 1, characterized in that: It also includes a filtering unit, the first end of which is connected to the power supply voltage circuit and the first pin of the ambient light sensor module, the second end of which is grounded, and the first pin of the ambient light sensor module is the power supply terminal.

6. The ambient light circuit for a head-up display as described in claim 5, characterized in that: The filtering unit includes two filter capacitors connected in parallel.

7. The ambient light circuit for a head-up display as described in claim 4, characterized in that: The pull-up module includes a first pull-up resistor, a second pull-up resistor, and a third pull-up resistor; One end of the first pull-up resistor is connected to the power supply voltage circuit, and the other end of the first pull-up resistor is connected to the sixth pin of the ambient light sensor module and the first pin of the microcontroller unit, respectively. One end of the second pull-up resistor is connected to the power supply voltage circuit, and the other end of the second pull-up resistor is connected to the fifth pin of the ambient light sensor module and the second pin of the microcontroller unit, respectively. One end of the third pull-up resistor is connected to the power supply voltage circuit, and the other end of the third pull-up resistor is connected to the fourth pin of the ambient light sensor module and the third pin of the microcontroller unit.

8. A head-up display device, comprising a fixed lens, characterized in that: The device includes a head-up display ambient light circuit as described in any one of claims 1-7, wherein the head-up display ambient light circuit is fixed to the fixed mirror.

9. The head-up display device as claimed in claim 8, characterized in that: The entire fixed lens is wrapped with a transparent cooling film.

10. A vehicle, characterized in that: It has a head-up display device as described in claim 8 or 9.

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