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CN-224217225-U - Head up display ambient light circuit, head up display device and vehicle

CN224217225UCN 224217225 UCN224217225 UCN 224217225UCN-224217225-U

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 device and a vehicle, wherein 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 a 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 of the pull-up module 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. The utility model adds the suppressing device in the power supply voltage circuit to reduce the problem of large interference of outward emission, and can realize that the display device of the head-up display automatically lightens or dims the backlight according to the intensity of ambient light.

Inventors

  • WANG LE
  • LI YIPING
  • LIN ZHU

Assignees

  • 常州星宇车灯股份有限公司

Dates

Publication Date
20260508
Application Date
20250509

Claims (10)

  1. 1. The ambient light circuit of the head-up display comprises an ambient light sensor module and a micro control unit, wherein the ambient light sensor module is used for sensing the intensity of ambient light and transmitting an ambient light intensity signal to the micro control unit, and the micro control unit is used for adjusting the backlight intensity of the head-up display according to the intensity of the ambient light.
  2. 2. The heads-up display ambient light circuit as claimed in claim 1 wherein the supply voltage circuit includes a supply voltage source and a suppression device, the supply voltage source outputting a voltage through the suppression device.
  3. 3. The head-up display ambient light circuit of claim 2, wherein the suppression device comprises a magnetic bead FB1, the magnetic bead FB1 being serially connected to an output circuit of the supply voltage source.
  4. 4. The heads-up display ambient light circuit of claim 1 wherein the ambient light sensor module is SFH-5721; the micro control unit comprises a first pin, a second pin, a third pin, a fourth pin, a fifth pin and a sixth pin; The fourth pin, the fifth pin and the sixth pin of the ambient light sensor module are respectively connected with the third pin, the second pin and the first pin of the micro control unit; The fourth pin of the ambient light sensor module is a terminal signal port, the third pin of the micro control unit is a general input/output port, the fifth pin and the sixth pin of the ambient light sensor module are I2C communication pins, and the first pin and the second pin of the micro control unit are I2C communication pins.
  5. 5. The head-up display ambient light circuit of claim 1, further comprising a filter unit, wherein a first end of the filter unit is connected to the supply voltage circuit and a first pin of the ambient light sensor module, a second end of the filter unit is grounded, and the first pin of the ambient light sensor module is a power terminal.
  6. 6. The head-up display ambient light circuit of claim 5, wherein the filter unit comprises two filter capacitors connected in parallel.
  7. 7. The head-up display ambient light circuit of claim 4, wherein the pull-up module comprises 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 with the power supply voltage circuit, and the other end of the first pull-up resistor is respectively connected with a sixth pin of the ambient light sensor module and a first pin of the micro control unit; One end of the second pull-up resistor is connected with the power supply voltage circuit, and the other end of the second pull-up resistor is respectively connected with a fifth pin of the ambient light sensor module and a second pin of the micro control unit; One end of the third pull-up resistor is connected with the power supply voltage circuit, and the other end of the third pull-up resistor is respectively connected with a fourth pin of the ambient light sensor module and a third pin of the micro control unit.
  8. 8. A head-up display device comprising a fixed mirror, wherein the head-up display ambient light circuit as claimed in any one of claims 1 to 7 is provided, and the head-up display ambient light circuit is fixed on the fixed mirror.
  9. 9. The head-up display device of claim 8, wherein the entire fixed mirror is surrounded by a transparent cold film.
  10. 10. A vehicle characterized by having a head-up display device as claimed in claim 8 or 9.

Description

Head up display ambient light circuit, head up display device and vehicle Technical Field The utility model relates to the technical field of head-up displays of vehicles, in particular to an ambient light circuit of a head-up display, a display device of the head-up display and a vehicle. Background The vehicle head-up display is used for projecting important information related to driving on a windshield glass, reducing the scattering of vision during driving and improving the safety. Because the change range of the ambient light brightness is larger in the running process of the automobile, the head-up display needs to adjust the light according to the ambient light so as to achieve the best visual effect. In the current common head-up display ambient light application module circuit, the outward emission interference is large, the adjacent wireless equipment is easy to be interfered, and the EMC is easy to exceed the standard. For example, chinese patent CN107560728a, an ambient light detection circuit for HUD, uses a phototransistor to collect the ambient light, and can automatically adjust the backlight brightness of HUD, and its potential electromagnetic interference source is easy to emit interference. In addition, in order to realize the ambient light detection with a large dynamic range, a sensor is adopted in the patent to collect two paths of signals, and the two paths of signals may possibly cause signal cross influence due to capacitive coupling or ground loop interference, and the amplified signal paths are easily subjected to external electromagnetic interference to cause abnormal MCU collection values, so that the circuit stability of the patent is also poor. Also, the response time of the phototransistor is slower than that of the photodiode, which may lead to a delay in detection when the light intensity changes rapidly (e.g., into and out of the tunnel), resulting in a lag in the brightness adjustment of the HUD. Disclosure of utility model The utility model aims to solve the technical problems and provides a head-up display ambient light circuit, a head-up display device and a vehicle. The technical scheme includes that the ambient light circuit of the head-up display comprises an ambient light sensor module and a micro control unit, wherein the ambient light sensor module is used for sensing the intensity of ambient light and transmitting an ambient light intensity signal to the micro control unit, the micro control unit is used for adjusting the backlight intensity of the head-up display according to the intensity of the ambient light, the ambient light circuit further comprises a pull-up module and a power supply voltage circuit, the ambient light sensor module is respectively connected with the power supply voltage circuit and the micro control unit, one end of the pull-up module is connected with the power supply voltage circuit, the other end of the pull-up module is connected between the ambient light sensor module and the micro control unit, the ambient light sensor module comprises a photodiode, and an anti-reflection coating is arranged on the surface of the photodiode. For example, the anti-reflection coating can be a silicon dioxide SiO 2 anti-reflection coating to reduce the reflection loss of light and improve the light absorption efficiency. The supply voltage circuit includes a supply voltage source and a suppression device, the supply voltage source outputting a voltage through the suppression device. The suppression device comprises a magnetic bead FB1, and the magnetic bead FB1 is connected in series to an output circuit of the power supply voltage source. The magnetic bead value of the magnetic bead FB1 is 120R. The model of the ambient light sensor module is SFH-5721. The micro control unit comprises a first pin, a second pin, a third pin, a fourth pin, a fifth pin and a sixth pin; The fourth pin, the fifth pin and the sixth pin of the ambient light sensor module are respectively connected with the third pin, the second pin and the first pin of the micro control unit; The fourth pin of the ambient light sensor module is a terminal signal port, the third pin of the micro control unit is a general input/output port, the fifth pin and the sixth pin of the ambient light sensor module are I2C communication pins, and the first pin and the second pin of the micro control unit are I2C communication pins. The utility model further discloses a head-up display ambient light circuit which comprises a filtering unit, wherein a first end of the filtering unit is connected with a power supply voltage circuit and a first pin of the ambient light sensor module, a second end of the filtering unit is grounded, and the first pin of the ambient light sensor module is a power supply terminal. The filtering unit comprises two parallel filtering capacitors. The capacitance values of the two filter capacitors are 4.7uF and 100nF respectively. The pull-up module comprises a first pull-up res