CN107068021B - ADC sampling method of head-up display based on frame synchronization - Google Patents
ADC sampling method of head-up display based on frame synchronization Download PDFInfo
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- CN107068021B CN107068021B CN201610083911.4A CN201610083911A CN107068021B CN 107068021 B CN107068021 B CN 107068021B CN 201610083911 A CN201610083911 A CN 201610083911A CN 107068021 B CN107068021 B CN 107068021B
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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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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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
- G09G3/3413—Details of control of colour illumination sources
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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
- G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
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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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0242—Compensation of deficiencies in the appearance of colours
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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
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
- G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
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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)
Abstract
An ADC sampling method of a frame synchronization-based head-up display, the head-up display comprising: an LED device for providing backlighting to a display, a controller therefor, and a digital light processing controller, the method comprising: the digital light processing controller generates a time sequence signal based on frame synchronization, and the time sequence signal corresponds to the conduction period of the LED with the corresponding color; the time sequence signal based on the frame synchronization is sent to the LED controller in an external interrupt signal mode; the LED controller triggers ADC sampling of the corresponding color LED based on the frame synchronization-based timing signal. Since ADC sampling can be triggered by an external interrupt signal, only one external interrupt port is used. And a detection circuit is not needed to detect the enabling gating signals of the red, green and blue LEDs, and an I/O port is not needed correspondingly. Thus, the use of LED controller ports is saved, reducing the complexity of the hardware design.
Description
Technical Field
The invention relates to a head-up display control technology, in particular to an ADC (analog-to-digital converter) sampling method of a head-up display based on frame synchronization.
Background
The head-up display enables a driver to view necessary information during driving without lowering his head, thereby contributing to improvement of driving safety and enhancement of convenience in information acquisition.
Currently, further developments are also being made in the industry that can enhance the performance of head-up displays, such as Digital Light Processing (DLP) chipsets developed by Texas Instruments (TI) and designed specifically for on-board head-up display applications, which are mainly composed of a Digital Micromirror Device (DMD) and a corresponding DLP controller.
To produce a frame of video, the DLP HUD displays a very fast sequence of interleaved red, green and blue pulses, which the human eye integrates into a full color image. However, this presents a small challenge to the acquisition of parameters such as current or brightness for a particular color LED. The common practice is: the control on signals of the red LED, the green LED and the blue LED as the backlight source are completely from the DLP controller. Therefore, for the LED controller, a three-way detection circuit is first required to determine which of the three LEDs red, green and blue is selected to be turned on at a certain time, and a corresponding number of ADC channels are required for collecting a certain physical quantity, such as current and brightness.
Since the pulse sequence changes rapidly (each pulse is only a few hundred microseconds), in the above scheme, if the LED controller adopts the polling method, it is difficult to detect the corresponding pulse. Even if detected occasionally, the LED controller often does not have enough time to sample, which makes it difficult for the method to work properly. In addition, monitoring the pulse train, i.e. which LED is selected to be on, requires the use of 3I/O ports. In the case of port strain, there is also a certain limit on the hardware. If the signal from the three-way detection circuit is provided to the LED controller as an external interrupt signal to trigger ADC sampling on the LEDs of three colors, respectively, 3 external interrupt ports are required, and the LED controller is often difficult to meet the hardware resource requirement.
Disclosure of Invention
The invention provides an ADC sampling method of a head-up display based on frame synchronization, so as to save hardware resources required by ADC sampling.
In order to solve the above problems, the present invention provides an ADC sampling method of a head-up display based on frame synchronization, the head-up display including: an LED device for providing backlighting to a display, a controller therefor, and a digital light processing controller, the method comprising:
the digital light processing controller generates a time sequence signal based on frame synchronization, and the time sequence signal corresponds to the conduction period of the LED with the corresponding color;
the time sequence signal based on the frame synchronization is sent to the LED controller in an external interrupt signal mode;
the LED controller triggers ADC sampling of the corresponding color LED based on the frame synchronization-based timing signal.
Compared with the prior art, the scheme has the following advantages: the ADC sampling can be triggered by an external interrupt signal, and only one external interrupt port is used. And a detection circuit is not needed to detect the enabling gating signals of the red, green and blue LEDs, and an I/O port is not needed correspondingly. Thus, the use of LED controller ports is saved, reducing the complexity of the hardware design.
Drawings
FIG. 1 is a schematic diagram of an ADC sampling method for a frame-synchronous-based head-up display according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an embodiment of a heads-up display to which the method of the present invention is applied;
fig. 3 is a schematic diagram of the relationship of signals in an embodiment of the method according to the invention.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention to those skilled in the art. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. Furthermore, it should be understood that the invention is not limited to the specific embodiments described. Rather, it is contemplated that the invention may be practiced with any combination of the following features and elements, whether or not they relate to different embodiments. Thus, the following aspects, features, embodiments and advantages are merely illustrative and should not be considered elements or limitations of the claims except where explicitly recited in a claim.
The invention utilizes the AST (ADC Sampling Timer) function of the DLP controller in the head-up display to enable the DLP controller to generate a time sequence signal based on frame synchronization. This timing signal can be used by the LED controller to ADC sample the physical quantities such as current and brightness of the LED for a particular color pulse during a frame. I.e. this timing signal is used as a trigger source for the ADC sampling.
Referring to fig. 1, according to an embodiment of the present invention, before each ADC sampling by the LED controller, the relevant registers in the DLP controller are configured. The related registers are configured so that the DLP controller corresponds to the turn-on periods of the LEDs of the corresponding color according to the frame synchronization-based timing signal generated by the AST function. Taking the above timing signal as an example of a pulse signal, the configuration contents mainly include: configuring disabling of the AST function, configuring a start time and a pulse width of the timing signal with respect to a frame sync signal, and configuring enabling of the AST function after the configuring is completed.
Then, after the frame synchronization signal arrives, the DLP controller generates the above timing signal according to the configuration of the register, and the timing signal is sent to the LED controller through the communication connection between the DLP controller and the LED controller as a trigger signal for triggering the LED controller to perform ADC sampling. And the LED controller, upon receiving the trigger signal, performs ADC sampling on the relevant physical quantities (e.g. current and brightness) of the corresponding color LED.
When the sampling is complete, all relevant registers in the DLP controller (e.g., via I2C communication) may be reconfigured by the LED controller, similarly, except that the LED targeted is changed to another color (again, of course, the same color is possible) depending on the image to be displayed.
Similarly, when the subsequent frame synchronization signal arrives, the DLP controller generates the timing signal according to the reconfiguration of the register and sends the timing signal to the LED controller. And the LED controller performs ADC sampling on the relevant physical quantity of the LED with the corresponding color after receiving the timing signal as the trigger signal. When the sampling is complete, the LED controller will again reconfigure all the relevant registers in the DLP controller. And repeating the steps to complete the image display control of the head-up display.
Fig. 2 provides a simplified illustration of an application architecture of the method of the invention in an in-vehicle head-up display. Specifically, the chipset controlling the in-vehicle head-up display may employ a DLP chipset of TI. Referring to fig. 2, the DLP chipset applied in this example includes: DLP controller, DMD controlled by DLP controller, LED controller of Piccolo MCU, red, green and blue LED controlled by LED controller. Through the control of the LED backlight color and brightness and the control of the DLP controller to the DMD, the required display content is finally projected on the front windshield or other head-up display interfaces of the vehicle. The automobile controller is coordinated with the LED controller and connected with the LED controller through an SPI bus so as to send a backlight setting command to the LED controller. The automobile controller obtains the CAN information from the CAN bus through the CAN communication module. And, the image controller transmits the video source to the DLP controller, which generates a frame sync signal based on the video source and further generates a timing signal based on the frame sync as a sampling trigger signal by its AST function according to the register configuration described above. The process is further illustrated below with reference to specific examples.
Specifically, referring to fig. 3, during the period of enabling the AST function (which is realized by the above configuration enabling, for example, during the period of high level of the AST function enabling signal in fig. 3), when the frame synchronization signal arrives, the above sampling trigger signal is generated according to the register configuration completed by the image to be displayed.
Although the present invention has been described with reference to the preferred embodiments, it is not limited thereto. Various changes and modifications within the spirit and scope of the present invention will become apparent to those skilled in the art from this disclosure, and it is intended that the scope of the present invention be defined by the appended claims.
Claims (5)
1. An ADC sampling method of a frame synchronization-based head-up display, the head-up display comprising: an LED device for providing backlight to a display, a controller thereof, and a digital light processing controller, wherein the method comprises:
the digital light processing controller generates a time sequence signal based on frame synchronization, and the time sequence signal corresponds to the conduction period of the LED with the corresponding color;
the time sequence signal based on the frame synchronization is sent to the LED controller in an external interrupt signal mode;
the LED controller triggers ADC sampling of the corresponding color LED based on the frame synchronization-based timing signal.
2. The ADC sampling method for a frame-synchronous-based heads-up display of claim 1, wherein the associated registers in the digital light processing controller are configured in advance such that the timing signals correspond to the turn-on periods of the respective color LEDs.
3. The ADC sampling method for a frame-synchronous-based head-up display according to claim 2, wherein after the ADC of the corresponding color LED is sampled, the correlation register is reconfigured so that the timing signal corresponds to a turn-on period of another color LED or a turn-on period of the same color LED again.
4. The ADC sampling method for a frame synchronization-based head-up display according to claim 2 or 3, wherein the correlation register is configured by an LED controller.
5. The ADC sampling method for a frame-synchronous based head-up display according to claim 1, wherein said timing signal is a pulse signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610083911.4A CN107068021B (en) | 2016-02-05 | 2016-02-05 | ADC sampling method of head-up display based on frame synchronization |
| PCT/IB2017/000077 WO2017134514A1 (en) | 2016-02-05 | 2017-02-06 | Frame synchronization-based adc sampling method for head up display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610083911.4A CN107068021B (en) | 2016-02-05 | 2016-02-05 | ADC sampling method of head-up display based on frame synchronization |
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| Publication Number | Publication Date |
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| CN107068021A CN107068021A (en) | 2017-08-18 |
| CN107068021B true CN107068021B (en) | 2020-08-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4031462B2 (en) * | 2004-04-23 | 2008-01-09 | 松下電器産業株式会社 | Luminance signal processing device, signal processing device, and luminance signal processing method |
| TWI293543B (en) * | 2005-12-07 | 2008-02-11 | Ind Tech Res Inst | Illumination brightness and color control system and method thereof |
| JP4739035B2 (en) * | 2006-01-25 | 2011-08-03 | シャープ株式会社 | Projector device |
| JP2007279625A (en) * | 2006-04-12 | 2007-10-25 | Seiko Epson Corp | Electrooptical device and its driving method, and electronic equipment |
| CN101460986B (en) * | 2006-11-29 | 2011-11-16 | 松下电器产业株式会社 | Video display device, video display method |
| KR20100048099A (en) * | 2008-10-30 | 2010-05-11 | 삼성전자주식회사 | Method for providing user interface using dmd and dlp display apparatus applying the same |
| CN101783114B (en) * | 2009-01-19 | 2011-12-28 | 深圳市新超亮特种显示设备有限公司 | Dynamic backlight control system for LCD partitioning |
| JP5235993B2 (en) * | 2009-06-03 | 2013-07-10 | 三菱電機株式会社 | Image display device |
| JP2013167776A (en) * | 2012-02-16 | 2013-08-29 | Mitsubishi Electric Corp | Projection type video display device |
| JP5998681B2 (en) * | 2012-07-03 | 2016-09-28 | 日本精機株式会社 | Field sequential image display device |
| JP2014066920A (en) * | 2012-09-26 | 2014-04-17 | Nippon Seiki Co Ltd | Display device |
| JP6079239B2 (en) * | 2013-01-04 | 2017-02-15 | 株式会社Ｊｖｃケンウッド | Image display device |
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| CN107068021A (en) | 2017-08-18 |
| WO2017134514A1 (en) | 2017-08-10 |
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Effective date of registration: 20181220 Address after: 241009 No. 18 Tianzhushan Road, Wuhu City, Anhui Province Applicant after: Continental automotive body electronic system (Wuhu) Co., Ltd. Address before: 241000 No. 27 Yinhu Road, Wuhu Economic and Technological Development Zone, Anhui Province Applicant before: Dalu Automotive (Wuhu) Co., Ltd. |
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