CN112530373A - Method for solving HUD backlight flicker - Google Patents
Method for solving HUD backlight flicker Download PDFInfo
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- CN112530373A CN112530373A CN202011396159.1A CN202011396159A CN112530373A CN 112530373 A CN112530373 A CN 112530373A CN 202011396159 A CN202011396159 A CN 202011396159A CN 112530373 A CN112530373 A CN 112530373A
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- max20090b
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000013078 crystal Substances 0.000 claims abstract description 6
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention belongs to the technical field of HUD (head up display) systems and LED (light emitting diode) backlight control, and particularly relates to a method for solving HUD backlight flicker, which comprises the following steps: step S1, adopting MAX20090B as a backlight driving IC, forming a power switch circuit by Q1, Q2 and NC resistor R13, and modulating output voltage; and S2, sequentially connecting an RT pin with a timing resistor R39 of external vibration frequency, setting the R39 value to 20K, setting the crystal oscillator frequency in MAX20090B to 1710KHz, defining the output PWM frequency, matching the output PWM frequency with a resistor R79 and a resistor R80 which are connected with an OVP pin of MAX20090B and a COMP pin, and adjusting the output PWM frequency together according to the characteristics of the LED backlight source so as to ensure the quality of output voltage and current. The invention adopts MAX20090B as a backlight driving main IC, optimizes the circuit design on the basis of a conventional circuit, realizes the control and adjustment of output PWM waves through the special setting of R39 value, enables the output voltage and current to be stable, and avoids the problem of HUD LED flicker caused by improper PWM control.
Description
Technical Field
The invention relates to the technical field of HUD (head up display) systems and LED (light emitting diode) backlight control, in particular to a method for solving HUD backlight flicker.
Background
The automobile HUD is a short for automobile head-up display and head-up display. The head-up display system belongs to a head-up display system, namely, a projection is arranged on a front windshield, and the projection can display some information, such as current speed, navigation information and the like, so that the eyes of a driver can always look at the front for driving, the distraction of the driver can be avoided, and the effects of improving the driving safety and convenience are achieved.
For the HUD system using TFT-LCD as the display source, since TFT-LCD does not emit light itself, the LED backlight source placed on the back of LCD is required to provide the light source, and the requirements for brightness are different under different environments. In the LED backlight component in the current HUD system, LEDs are generally driven in a direct-current voltage driving mode, and brightness is modulated by adopting a PWM waveform, because the vehicle-mounted environment is complex, and the backlight brightness requirement of the HUD is up to 1000Kcd/m2, under the high brightness condition, if the PWM control is improper, the problem of backlight flicker can be caused.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a method for solving the problem of backlight flicker of a HUD (head Up display) system, which solves the problem that the backlight flicker is easily caused due to improper PWM (pulse Width modulation) control of the HUD system.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a method of addressing HUD backlight flicker, comprising the steps of:
step S1, adopting MAX20090B as a backlight driving IC, forming a power switch circuit by Q1 connected with NDRV pin of MAX20090B, Q2 connected with DIMOUT pin, and NC resistor R13 connected with INSENSE + pin and INSENSE-pin, and modulating output voltage;
and S2, sequentially connecting an RT pin of MAX20090B with a timing resistor R39 of vibration frequency, setting a value of R39 to 20K, setting a crystal oscillator frequency inside MAX20090B to 1710KHz, defining output PWM frequency, matching with a resistor R79 and a resistor R80 which are connected with an OVP pin and a COMP pin of MAX20090B, and adjusting the output PWM frequency jointly according to the characteristics of an LED backlight source to ensure the quality of output voltage and current.
As a preferred technical scheme of the invention, the VIN PIN PIN is connected with an input source end of a power supply, is controlled by MAX20090B to be converted into 18V output, and the voltage of the power supply V-LED is 12V.
In a preferred embodiment of the present invention, the NC resistor R13 is set to a value of 0.13R.
In a preferred embodiment of the present invention, the resistor R79 is set to 180R.
In a preferred embodiment of the present invention, the resistor R80 is set to 10K.
(III) advantageous effects
Compared with the prior art, the invention provides a method for solving HUD backlight flicker, which has the following beneficial effects:
this method of solving HUD scintillation in a poor light adopts MAX20090B as the drive master IC in a poor light, has optimized circuit design on conventional circuit's basis, through the special settlement of R39 value, realizes the control adjustment to output PWM ripples for output voltage, electric current are stable, avoid because PWM control is improper, cause the problem of HUD LED scintillation.
Drawings
FIG. 1 is a schematic diagram of a HUD backlight driving control IC according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
Referring to fig. 1, the present invention provides the following technical solutions: a method of addressing HUD backlight flicker, comprising the steps of:
step S1, adopting MAX20090B as a backlight driving IC, forming a power switch circuit by Q1 connected with NDRV pin of MAX20090B, Q2 connected with DIMOUT pin, and NC resistor R13 connected with INSENSE + pin and INSENSE-pin, and modulating output voltage;
and S2, sequentially connecting an RT pin of MAX20090B with a timing resistor R39 of vibration frequency, setting a value of R39 to 20K, setting a crystal oscillator frequency inside MAX20090B to 1710KHz, defining output PWM frequency, matching with a resistor R79 and a resistor R80 which are connected with an OVP pin and a COMP pin of MAX20090B, and adjusting the output PWM frequency jointly according to the characteristics of an LED backlight source to ensure the quality of output voltage and current.
Specifically, the VIN PIN is connected with the input end of the power supply and is controlled by MAX20090B to be converted into 18V output, and the power supply voltage V-LED is 12V.
Specifically, the NC resistor R13 value is set to 0.13R.
Specifically, the resistor R79 is set to a value of 180R.
Specifically, the resistance R80 is set to a value of 10K.
The working principle and the using process of the invention are as follows: adopt MAX20090B as backlight drive's basis, with R39 as the utilization point who solves HUD and be shaded scintillation, R39 value sets up to 20K, set up MAX20090B internal crystal oscillator frequency to 1710KHz, delimit the PWM frequency of output, external vibration frequency timing resistance R39 of MAX 20090B's RT pin, set up R39 value to 20K, set up MAX20090B internal crystal oscillator frequency to 1710KHz, delimit the PWM frequency of output, and insert MAX 20090B's OVP pin and COMP pin's resistance R79 and resistance R80 cooperation, according to the characteristic of LED backlight, adjust the PWM frequency of output jointly, in order to guarantee the quality of output voltage and electric current, ensure that LED can not flicker.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A method for solving HUD backlight flicker is characterized in that: the method comprises the following steps:
step S1, adopting MAX20090B as a backlight driving IC, forming a power switch circuit by Q1 connected with NDRV pin of MAX20090B, Q2 connected with DIMOUT pin, and NC resistor R13 connected with INSENSE + pin and INSENSE-pin, and modulating output voltage;
and S2, sequentially connecting an RT pin of MAX20090B with a timing resistor R39 of vibration frequency, setting a value of R39 to 20K, setting a crystal oscillator frequency inside MAX20090B to 1710KHz, defining output PWM frequency, matching with a resistor R79 and a resistor R80 which are connected with an OVP pin and a COMP pin of MAX20090B, and adjusting the output PWM frequency jointly according to the characteristics of an LED backlight source to ensure the quality of output voltage and current.
2. A method of addressing HUD backlight flicker according to claim 1, wherein: the VIN PIN PIN is connected with an input source end of a power supply and is controlled by MAX20090B to be converted into 18V output, and the power supply voltage V-LED is 12V.
3. A method of addressing HUD backlight flicker according to claim 1, wherein: the NC resistor R13 is set to a value of 0.13R.
4. A method of addressing HUD backlight flicker according to claim 1, wherein: the resistor R79 is set to a value of 180R.
5. A method of addressing HUD backlight flicker according to claim 1, wherein: the resistor R80 is set to a value of 10K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011396159.1A CN112530373A (en) | 2020-12-03 | 2020-12-03 | Method for solving HUD backlight flicker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011396159.1A CN112530373A (en) | 2020-12-03 | 2020-12-03 | Method for solving HUD backlight flicker |
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| Publication Number | Publication Date |
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| CN112530373A true CN112530373A (en) | 2021-03-19 |
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| CN202011396159.1A Pending CN112530373A (en) | 2020-12-03 | 2020-12-03 | Method for solving HUD backlight flicker |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018103253A1 (en) * | 2016-12-09 | 2018-06-14 | 华为技术有限公司 | Mobile device, backlight control method thereof, and flash calibration method and apparatus thereof |
| CN210777795U (en) * | 2019-10-11 | 2020-06-16 | 深圳市瀚思通汽车电子有限公司 | LED backlight driving interference signal suppression circuit for HUD system |
| CN215577634U (en) * | 2020-12-03 | 2022-01-18 | 深圳市瀚思通汽车电子有限公司 | System for solving HUD backlight flicker |
-
2020
- 2020-12-03 CN CN202011396159.1A patent/CN112530373A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018103253A1 (en) * | 2016-12-09 | 2018-06-14 | 华为技术有限公司 | Mobile device, backlight control method thereof, and flash calibration method and apparatus thereof |
| CN210777795U (en) * | 2019-10-11 | 2020-06-16 | 深圳市瀚思通汽车电子有限公司 | LED backlight driving interference signal suppression circuit for HUD system |
| CN215577634U (en) * | 2020-12-03 | 2022-01-18 | 深圳市瀚思通汽车电子有限公司 | System for solving HUD backlight flicker |
Non-Patent Citations (1)
| Title |
|---|
| "Flexible LED Controller Simplifies Automotive Exterior Lighting Design", pages 1 - 3, Retrieved from the Internet <URL:www.analog.com/en/products/max20090.html> * |
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Application publication date: 20210319 Assignee: Suzhou Hantai Automotive Electronic Technology Co.,Ltd. Assignor: HARDSTON MOBILE MEDIA (ASIA PACIFIC) CO.,LTD. Contract record no.: X2022980014718 Denomination of invention: A way to solve HUD backlight flickering License type: Common License Record date: 20220906 |
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Assignee: Suzhou Hantai Automotive Electronic Technology Co.,Ltd. Assignor: HARDSTON MOBILE MEDIA (ASIA PACIFIC) CO.,LTD. Contract record no.: X2022980014718 Date of cancellation: 20240104 |
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