CN220731150U - Sunlight backflow prevention circuit, head-up display assembly and vehicle - Google Patents
Sunlight backflow prevention circuit, head-up display assembly and vehicle Download PDFInfo
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- CN220731150U CN220731150U CN202322055193.8U CN202322055193U CN220731150U CN 220731150 U CN220731150 U CN 220731150U CN 202322055193 U CN202322055193 U CN 202322055193U CN 220731150 U CN220731150 U CN 220731150U
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- 230000002265 prevention Effects 0.000 title claims abstract description 18
- 238000012545 processing Methods 0.000 claims abstract description 42
- 239000010409 thin film Substances 0.000 claims abstract description 32
- 238000001514 detection method Methods 0.000 claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 7
- 230000003190 augmentative effect Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000005693 optoelectronics Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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Abstract
The embodiment of the utility model discloses a sunlight backflow prevention circuit, a head-up display assembly and a vehicle. The sunlight backflow preventing circuit comprises: the micro control unit is connected with the thin film transistor display screen and comprises a unit serial data end, a unit serial clock end and a general input/output end, wherein the pins of the general input/output end are open-drain type; the infrared sensing chip comprises an infrared detection circuit and a data processing circuit which are connected with each other, wherein the infrared detection circuit is used for detecting the intensity of sunlight irradiated on a display screen of the detection thin film transistor, and the data processing circuit comprises a chip serial data end, a chip serial clock end and an external interrupt end; the chip serial data end is connected with the unit serial data end, the chip serial clock end is connected with the unit serial clock end, and the external interrupt end is connected with the general input and output end. The utility model can effectively avoid the problem of backflow of sunlight.
Description
Technical Field
The utility model relates to the technical field of sunlight backflow prevention, in particular to a sunlight backflow prevention circuit, a head-up display assembly and a vehicle.
Background
The new generation of AR-HUD (Augmented Reality-Head Up Display, augmented reality) is created by utilizing AR (Augmented Reality) technology and integrating with HUD (Head Up Display), and the augmented reality type Head Up Display (AR-HUD) is formed by increasing the magnification of virtual images on the basis of WHOD so as to realize longer VID (projection distance), so that the problem of sunlight backflow of the AR-HUD is more serious compared with the traditional HUD.
The problem of sunlight backflow refers to that sunlight flows back into a TFT (Thin-Film Transistor Display, thin film transistor display screen) and the temperature is too high due to light convergence, and even the TFT is burnt.
Disclosure of Invention
Based on the above, it is necessary to provide a sunlight backflow prevention circuit, a head up display assembly and a vehicle, which can effectively avoid the sunlight backflow problem.
A sunlight backflow prevention circuit for controlling backlight brightness of a thin film transistor display screen, comprising:
the micro control unit is connected with the thin film transistor display screen and comprises a unit serial data end, a unit serial clock end and a general input/output end, wherein the pins of the general input/output end are open-drain type;
the infrared sensing chip comprises an infrared detection circuit and a data processing circuit which are connected with each other, wherein the infrared detection circuit is used for detecting the intensity of sunlight irradiated on a display screen of the detection thin film transistor, and the data processing circuit comprises a chip serial data end, a chip serial clock end and an external interrupt end;
the chip serial data end is connected with the unit serial data end, the chip serial clock end is connected with the unit serial clock end, and the external interrupt end is connected with the general input and output end.
Wherein, infrared detection circuit includes:
the differential amplifier comprises an inverting input end, a non-inverting input end and an output end, and the output end of the differential amplifier is connected with the data processing circuit;
the negative electrode of the sensing diode is connected with the positive input end of the differential amplifier; the positive electrode is grounded;
the negative electrode of the infrared diode is connected with the positive input end of the differential amplifier; the positive electrode is grounded;
the negative electrode of the dark photodiode is connected with the inverting input end of the differential amplifier; the positive electrode is grounded.
Wherein the data processing circuit comprises:
the data processing chip is connected with the output end of the infrared detection circuit and comprises an address port, and the address port is connected with a voltage input end or a grounding end;
the integrated circuit bus interface comprises two output ends, namely a chip serial data end and a chip serial clock end, and the input end of the integrated circuit bus interface is connected with the data processing chip;
and the output port of the interrupt controller module is the external interrupt end, and the input end of the interrupt controller module is connected with the data processing chip.
When the address of the integrated circuit bus interface is 0X44, the address port is connected with the grounding end;
when the address of the integrated circuit bus interface is 0X45, the address port is connected with the voltage input end.
Wherein, infrared sensing chip still includes:
the analog-to-digital conversion circuit is connected between the infrared detection circuit and the data processing circuit and is used for converting the output of the infrared detection circuit into a digital signal and transmitting the digital signal to the data processing circuit.
Wherein, infrared sensing chip still includes:
an oscillator and reference signal generating circuit for providing a clock signal to the data processing chip and a reference signal to the analog-to-digital conversion circuit.
Wherein, prevent sunshine backward flow circuit still includes:
and the pull-up resistor group comprises three pull-up resistors, one end of each pull-up resistor is connected with the chip serial data end, the chip serial clock end and the external interrupt end, and the other end of each pull-up resistor is connected with the bus voltage end and is used for pulling up the voltages output by the chip serial data end, the chip serial clock end and the external interrupt end to a logic high level.
Wherein, prevent sunshine backward flow circuit still includes:
and the bypass capacitor is connected in parallel between the power input end and the grounding end of the infrared sensor chip.
A heads-up display assembly comprising:
a projection lens, wherein the projection lens is provided with the sunlight backflow prevention circuit;
and the thin film transistor display screen is arranged relative to the projection lens, and a backlight brightness adjusting circuit of the thin film transistor display screen is connected with the sunlight backflow preventing circuit.
A vehicle comprising a heads-up display assembly as described above.
The embodiment of the utility model has the following beneficial effects:
when sunlight irradiates onto the thin film transistor display screen, the infrared detection circuit can detect the sunlight intensity on the thin film transistor display screen and transmit the detected sunlight intensity to the data processing circuit, and the data processing circuit converts the sunlight intensity information into information which can be read by the micro control unit and then sends the information to the micro control unit, so that the micro control unit can adjust the backlight brightness of the thin film transistor display screen according to the sunlight intensity so as to protect the thin film transistor display screen.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Wherein:
FIG. 1 is a schematic diagram of an embodiment of a solar reverse flow prevention circuit according to the present utility model;
fig. 2 is a schematic structural diagram of an embodiment of an infrared sensor chip according to the present utility model;
FIG. 3 is a schematic diagram of an embodiment of a head-up display assembly according to the present utility model;
fig. 4 is a schematic structural view of an embodiment of a vehicle provided by the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs; the terms used in the specification are used herein for the purpose of describing particular embodiments only and are not intended to limit the present utility model, for example, the orientations or positions indicated by the terms "length", "width", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are orientations or positions based on the drawings, which are merely for convenience of description and are not to be construed as limiting the present utility model.
The terms "comprising" and "having" and any variations thereof in the description of the utility model and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion; the terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. The meaning of "a plurality of" is two or more, unless specifically defined otherwise.
In the description of the utility model and the claims and the above figures, when an element is referred to as being "fixed" or "mounted" or "disposed" or "connected" to another element, it can be directly or indirectly on the other element. For example, when an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.
Furthermore, references herein to "an embodiment" mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present utility model. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Referring to fig. 1 and fig. 2 in combination, fig. 1 is a schematic structural diagram of an embodiment of a sunlight backflow prevention circuit according to the present utility model, and fig. 2 is a schematic structural diagram of an embodiment of an infrared sensor chip according to the present utility model.
The sunlight backflow preventing circuit 10 comprises a micro control unit 11 and an infrared sensing chip 12 which are connected with each other. The micro control unit 11 is connected to the tft display screen, and is configured to control backlight brightness of the tft display screen, and includes a serial data terminal SCL, a serial clock terminal SDA, and a general purpose input/output terminal GPIO. SCL (Serial Clock Line, serial Data) and SDA (Serial Data Line, serial clock) are I 2 Two signal lines on the C (Inter-Integrated Circuit) bus are used for communication between a plurality of devices. They are typically associated with GPIO (General Purpose Input/Output) pins to provide I 2 And C, communication function. Wherein the method comprises the steps ofThe general purpose input/output terminal GPIO pin is an Open-Drain type, and an Open-Drain type pin (Open-Drain) is a common output pin structure, so that a plurality of pins can be collected or shared, for example, a common pull-up resistor can provide a pull-up level. The open drain output pin is in a high resistance state when outputting a high level, so that the influence of external interference signals on output can be effectively resisted.
The infrared detection circuit 121 and the data processing circuit 122 are mutually connected with the infrared sensor chip 12, the infrared detection circuit 121 is used for detecting the sunlight intensity irradiated on the detection thin film transistor display screen, the data processing circuit 122 is used for transmitting the detected result of the infrared detection circuit 121 to the micro control unit 11, and therefore the micro control unit 11 can adjust the backlight brightness of the thin film transistor display screen according to the detection result of the infrared detection circuit 121.
The ir sensor chip 12 includes a power input terminal VDD and a ground terminal GND, wherein the power input terminal VDD is connected to the power VCC, and the ground terminal GND is grounded. A bypass capacitor C1 having a capacity of 0.1 μf to 1 μf is connected in parallel between the power supply input terminal VDD and the ground terminal GND. Bypass capacitor C1 may help stabilize the supply voltage. Transient fluctuations in the voltage on the supply line may occur when there is an inductance and a resistance on the supply line. The bypass capacitor can smooth these transient fluctuations by absorbing and releasing charge, making the input power supply input VDD voltage more stable.
The data processing circuit 122 includes a chip serial data terminal SCL, a chip serial clock terminal SDA, and an external interrupt terminal INTn, where the chip serial data terminal SCL is connected to the unit serial data terminal SCL, the chip serial clock terminal SDA, and the unit serial clock terminal SDA, and the external interrupt terminal INTn is connected to the general purpose input/output terminal GPIO. The data processing circuit 122 is thus able to perform I with the micro-control unit 11 2 C (Inter-Integrated Circuit) communication, transmitting the detected result of the infrared detection circuit 121 to the micro control unit 11.
With continued reference to fig. 2, the infrared detection circuit 121 includes a differential amplifier for amplifying the differential signal. It has two inputs and one output, one of which is a normal phase input and the other of which is an inverted phase input. Differential amplifiers produce an output signal by amplifying the difference between two input signals. The basic principle is to generate an output signal by amplifying the difference of the input signals. When the two input signals are equal, the output of the differential amplifier is zero. When there is a difference between the two input signals, the differential amplifier amplifies the difference and outputs the amplified signal.
The inverting input of the differential amplifier receives the input of a dark photodiode PD1, a special type of diode for detecting the optical signal and converting it into an electrical signal. Dark photodiodes have special structures and materials compared to ordinary diodes, enabling them to sense light more sensitively. It uses the internal photoelectric effect to sense light and produce an output current proportional to the light intensity. The negative electrode of the dark photodiode is connected with the inverting input end of the differential amplifier; the positive electrode is grounded.
The noninverting input of the differential amplifier receives the input of either a photodiode PD2 or an infrared diode PD 3. A first switch S1 is arranged between the photodiode PD2 and the positive input end of the differential amplifier, a second switch S2 is arranged between the infrared diode PD3 and the positive input end of the differential amplifier, and the first switch S1 and the second switch S2 are used for facilitating the user to select whether the photodiode PD2 or the infrared diode PD3 is connected into the circuit.
In this embodiment, the dark photodiode PD1 is connected to the inverting input terminal of the differential amplifier, and the photodiode PD2 or the infrared diode PD3 is connected to the non-inverting input terminal of the differential amplifier, and the signal of the dark photodiode PD1 is subtracted from the signal of the photodiode PD2 or the infrared diode PD3 by the action of the differential amplifier, so as to implement dark current compensation. Dark current is the non-photo-generated current that exists in an optoelectronic device in the absence of illumination. It may be caused by thermal excitation, carrier recombination or impurity equivalent. The presence of dark current can lead to an offset of the output signal and an increase in noise, thereby degrading the performance and sensitivity of the optoelectronic device. Dark current compensation can improve the performance and sensitivity of the optoelectronic device, making it more reliable and accurate to operate in low light conditions.
The data processing circuit 122 includes a data processing chip connected to the output terminal of the infrared detection circuit 121, that is, the output terminal of the differential amplifier, and includes an address port ADDR connected to the voltage input terminal VDD or the ground terminal GND. The data processing circuit 122 further comprises an integrated circuit bus interface comprising two output terminals, a chip serial data terminal SCL and a chip serial clock terminal SDA, respectively. The input end of the integrated circuit bus interface is connected with the data processing chip. When the address of the integrated circuit bus interface is 0X44, the address port ADDR is connected with the ground end GND; when the address of the integrated circuit bus interface is 0X45, the address port is connected to the voltage input terminal VDD. The data processing circuit 122 further includes an interrupt controller module, an output port of which is the external interrupt terminal INTn, and an input terminal of which is connected to the data processing chip.
An analog-to-digital conversion circuit ADC is further disposed between the infrared detection circuit 121 and the data processing circuit 122, and is configured to convert an analog signal output by the infrared detection circuit 121 into a digital signal and transmit the digital signal to the data processing circuit 122. Specifically, the differential amplifier outputs an analog signal generated by a diode such as an infrared diode, and the analog signal needs to be converted into a digital signal by the analog-to-digital conversion circuit ADC to be read and processed by the data processing chip.
The infrared sensing chip 12 further includes an oscillator and reference signal generating circuit for providing a clock signal to the data processing chip and a reference signal to the analog-to-digital conversion circuit. Receiving the reference signal may help determine the conversion range, resolution, perform calibration and correction of the ADC, and implement a uniform measurement standard. These are all critical to ensure accuracy, reliability and comparability of the ADC. The main reason for receiving the clock signal is to synchronize and coordinate the operation of the data processing. The clock signal provides a uniform time reference so that the data processing chip can operate at fixed time intervals to ensure the accuracy and reliability of the data.
The sunlight backflow prevention circuit 10 further comprises a pull-up resistor set, which comprises three pull-up resistors R, wherein one end of each pull-up resistor R is connected with the chip serial data end SCL, the chip serial clock end SDA and the external interrupt end INTn, and the other end of each pull-up resistor R is connected with the bus voltage end VBUS and is used for pulling up the voltages of signals output by the chip serial data end SCL, the chip serial clock end SDA and the external interrupt end INTn to logic high level. The effect of pulling the output signal high to a logic high level is to ensure that the various input ports of the micro control unit 11 are logically considered high to ensure logic correctness, improve immunity to interference, and achieve compatibility with other digital circuits. This is important for proper operation and reliability of the digital circuit.
In this embodiment, when sunlight irradiates onto the thin film transistor display screen, the infrared detection circuit can detect the sunlight intensity on the thin film transistor display screen and transmit the detected sunlight intensity to the data processing circuit, and the data processing circuit converts the information of the sunlight intensity into information which can be read by the micro control unit and then sends the information to the micro control unit, so that the micro control unit can adjust the backlight brightness of the thin film transistor display screen according to the sunlight intensity so as to protect the thin film transistor display screen. The sunlight backflow prevention circuit design in the embodiment has high performance, high data uniformity, low data noise and high reliability, and can effectively prevent damage to the thin film transistor display screen when sunlight irradiates the thin film transistor display screen.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a head-up display assembly according to an embodiment of the utility model. Head-up display assembly 20 includes a projection mirror 21 and a thin film transistor display screen 22. The sunlight backflow preventing circuit 10 is arranged on the projection lens 21, and the backlight brightness adjusting circuit 221 of the thin film transistor display screen 22 is connected with the sunlight backflow preventing circuit 10, so that under the condition that sunlight irradiates the thin film transistor display screen 22 to cause the temperature of the thin film transistor display screen 22 to rise, the sunlight backflow preventing circuit 10 can timely detect the condition, and timely adjust the backlight brightness of the thin film transistor display screen 22 to protect the thin film transistor display screen 22.
Referring to fig. 4, fig. 4 is a schematic structural diagram of an embodiment of a vehicle according to the present utility model. Vehicle 30 includes head-up display assembly 20.
The foregoing description is only of the preferred embodiments of the utility model and is not intended to limit the utility model. Various modifications and variations of the present utility model will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the scope of the claims of the present utility model.
Claims (10)
1. A sunlight backflow prevention circuit for controlling backlight brightness of a thin film transistor display screen, comprising:
the micro control unit is connected with the thin film transistor display screen and comprises a unit serial data end, a unit serial clock end and a general input/output end, wherein the pins of the general input/output end are open-drain type;
the infrared sensing chip comprises an infrared detection circuit and a data processing circuit which are connected with each other, wherein the infrared detection circuit is used for detecting the intensity of sunlight irradiated on a display screen of the detection thin film transistor, and the data processing circuit comprises a chip serial data end, a chip serial clock end and an external interrupt end;
the chip serial data end is connected with the unit serial data end, the chip serial clock end is connected with the unit serial clock end, and the external interrupt end is connected with the general input and output end.
2. The sunlight backflow prevention circuit of claim 1 wherein the infrared detection circuit comprises:
the differential amplifier comprises an inverting input end, a non-inverting input end and an output end, and the output end of the differential amplifier is connected with the data processing circuit;
the negative electrode of the sensing diode is connected with the positive input end of the differential amplifier; the positive electrode is grounded;
the negative electrode of the infrared diode is connected with the positive input end of the differential amplifier; the positive electrode is grounded;
the negative electrode of the dark photodiode is connected with the inverting input end of the differential amplifier; the positive electrode is grounded.
3. The sunlight backflow prevention circuit of claim 1 wherein the data processing circuit comprises:
the data processing chip is connected with the output end of the infrared detection circuit and comprises an address port, and the address port is connected with a voltage input end or a grounding end;
the integrated circuit bus interface comprises two output ends, namely a chip serial data end and a chip serial clock end, and the input end of the integrated circuit bus interface is connected with the data processing chip;
and the output port of the interrupt controller module is the external interrupt end, and the input end of the interrupt controller module is connected with the data processing chip.
4. A sunlight backflow preventing circuit according to claim 3 wherein the address port is connected to ground when the address of the integrated circuit bus interface is 0X 44;
when the address of the integrated circuit bus interface is 0X45, the address port is connected with the voltage input end.
5. A sunlight backflow prevention circuit in accordance with claim 3 wherein said infrared sensing chip further comprises:
the analog-to-digital conversion circuit is connected between the infrared detection circuit and the data processing circuit and is used for converting the output of the infrared detection circuit into a digital signal and transmitting the digital signal to the data processing circuit.
6. The sunlight backflow prevention circuit of claim 5 wherein the infrared sensing chip further comprises:
an oscillator and reference signal generating circuit for providing a clock signal to the data processing chip and a reference signal to the analog-to-digital conversion circuit.
7. The sunlight reverse flow preventing circuit of any one of claims 1 to 6 wherein the sunlight reverse flow preventing circuit further comprises:
and the pull-up resistor group comprises three pull-up resistors, one end of each pull-up resistor is connected with the chip serial data end, the chip serial clock end and the external interrupt end, and the other end of each pull-up resistor is connected with the bus voltage end and is used for pulling up the voltages output by the chip serial data end, the chip serial clock end and the external interrupt end to a logic high level.
8. The sunlight reverse flow preventing circuit of any one of claims 1 to 6 wherein the sunlight reverse flow preventing circuit further comprises:
and the bypass capacitor is connected in parallel between the power input end and the grounding end of the infrared sensing chip.
9. A head-up display assembly, comprising:
a projection lens provided with the sunlight backflow prevention circuit as described in any one of claims 1 to 8;
and the thin film transistor display screen is arranged relative to the projection lens, and a backlight brightness adjusting circuit of the thin film transistor display screen is connected with the sunlight backflow preventing circuit.
10. A vehicle comprising the heads-up display assembly of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322055193.8U CN220731150U (en) | 2023-08-01 | 2023-08-01 | Sunlight backflow prevention circuit, head-up display assembly and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322055193.8U CN220731150U (en) | 2023-08-01 | 2023-08-01 | Sunlight backflow prevention circuit, head-up display assembly and vehicle |
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| Publication Number | Publication Date |
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| CN220731150U true CN220731150U (en) | 2024-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202322055193.8U Active CN220731150U (en) | 2023-08-01 | 2023-08-01 | Sunlight backflow prevention circuit, head-up display assembly and vehicle |
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| CN (1) | CN220731150U (en) |
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- 2023-08-01 CN CN202322055193.8U patent/CN220731150U/en active Active
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