CN106793738B - The method and device of the electromagnetic interference (EMI) emissions adjustment of display device interfaces - Google Patents
The method and device of the electromagnetic interference (EMI) emissions adjustment of display device interfaces Download PDFInfo
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- CN106793738B CN106793738B CN201710179603.6A CN201710179603A CN106793738B CN 106793738 B CN106793738 B CN 106793738B CN 201710179603 A CN201710179603 A CN 201710179603A CN 106793738 B CN106793738 B CN 106793738B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/006—Casings specially adapted for signal processing applications, e.g. CATV, tuner, antennas amplifier
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Abstract
The present invention relates to field of display technology, more particularly to a kind of method and device of the electromagnetic interference (EMI) emissions adjustment of display device interfaces, wherein, the method of electromagnetic interference (EMI) emissions adjustment includes: to read the first extending display identification data when detecting that pixel clock frequency is greater than or equal to the first predeterminated frequency value；The first extending display identification data are adjusted according to look-up table, obtain the second extending display identification data；New pixel clock frequency is exported according to the second extending display identification data.The present invention is by the adjustment to pixel clock frequency, to realize low cost, efficient inhibition electromagnetic interference (EMI) emissions.
Description
Technical field
The present invention relates to a kind of sides of the electromagnetic interference (EMI) emissions of field of display technology more particularly to display device interfaces adjustment
Method and device.
Background technique
Electromagnetic interference (Electromagnetic Interference abbreviation EMI), there is Conduction Interference and radiation interference two
Kind.Conduction Interference refers to through conducting medium the signal coupling (interference) on an electric network to another electric network.Radiation
Interference refers to interference source by space its signal coupling (interference) to another electric network.In High-Speed PCB and system design,
High-frequency signal line, the pin of integrated circuit, all kinds of connectors etc. are all likely to become the radiation interference source with antenna performance, can send out
Radio magnetic wave and the normal work for influencing other subsystems in other systems or this system.
As the function of electronic product is stronger and stronger, a step is use up to the processing speed of signal and is improved.EMI excessive problem is got over
Come more serious, but the requirement of relevant authentication is higher and higher.The prior art is such as modified by the transformation to hardware
PCB layout, modifies the modes such as structure and selection to inhibit EMI at replacement component, can bring product cost using these modes
The technical issues of height, low efficiency.
Summary of the invention
The purpose of the present invention is to provide a kind of method and device of the electromagnetic interference (EMI) emissions of display device interfaces adjustment, purports
Solving the problems, such as that the prior art is insurmountable because of the high cost of EMI bring, inefficient technical problem.
First aspect present invention provides a kind of method of the electromagnetic interference (EMI) emissions adjustment of display device interfaces, the method packet
It includes:
When detecting that pixel clock frequency is greater than or equal to the first predeterminated frequency value, the first extending display identification number is read
According to；
The first extending display identification data are adjusted according to look-up table, obtain the second extending display identification number
According to；
New pixel clock frequency is exported according to the second extending display identification data.
Second aspect of the present invention provides a kind of device of the electromagnetic interference (EMI) emissions adjustment of display device interfaces, described device packet
It includes:
Read module, for reading first when detecting that pixel clock frequency is greater than or equal to the first predeterminated frequency value
Extending display identification data；
Module is adjusted, for being adjusted according to look-up table to the first extending display identification data, second is obtained and expands
Open up display identification data；
Module is obtained, for exporting new pixel clock frequency according to the second extending display identification data.
The present invention provides a kind of method and device of the electromagnetic interference (EMI) emissions adjustment of display device interfaces, when detecting pixel
When clock frequency is greater than or equal to the first predeterminated frequency value, the first extending display identification data are read；According to look-up table to first
Extending display identification data are adjusted, and obtain the second extending display identification data；According to the second extending display identification number
According to the new pixel clock frequency of output.The present invention is by the adjustment to pixel clock frequency, to realize low cost, efficient suppression
Electromagnetic interference (EMI) emissions processed.
Detailed description of the invention
Fig. 1 is a kind of process of the electromagnetic interference (EMI) emissions method of adjustment of display device interfaces provided in an embodiment of the present invention
Figure；
Fig. 2 be it is provided in an embodiment of the present invention the first extending display identification data are adjusted according to look-up table,
Obtain the flow chart of the method for the second extending display identification data；
Fig. 3 is that a kind of structure of the electromagnetic interference (EMI) emissions adjustment device of display device interfaces provided in an embodiment of the present invention is shown
It is intended to；
Fig. 4 is the structural schematic diagram of adjustment module provided in an embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
It should be appreciated that ought use in this specification and in the appended claims, term " includes " and "comprising" instruction
Described feature, entirety, step, operation, the presence of element and/or component, but one or more of the other feature, whole is not precluded
Body, step, operation, the presence or addition of element, component and/or its set.
It is also understood that mesh of the term used in this description of the invention merely for the sake of description specific embodiment
And be not intended to limit the present invention.As description of the invention and it is used in the attached claims, unless on
Other situations are hereafter clearly indicated, otherwise "the" is intended to include plural form.
It should be noted that term used in this specification is explained as follows:
1) electromagnetic interference (Electromagnetic Interference abbreviation EMI), refers to electromagnetic wave and electronic component
The interference phenomenon generated after effect, there is Conduction Interference and two kinds of radiation interference.Conduction Interference refers to through conducting medium one
Another electric network is arrived in signal coupling (interference) on a electric network.Radiation interference refers to interference source by space its signal coupling
Close (interference) and arrive another electric network, in High-Speed PCB and system design, high-frequency signal line, integrated circuit pin, all kinds of connect
Plug-in unit etc. is all likely to become the radiation interference source with antenna performance, can emit electromagnetic wave and influence in other systems or this system
The normal work of other subsystems.
2) full name of EDID is Extended Display Identification Data (extending display identification data),
Share 128 bytes.It wherein include the parameter in relation to display and its performance, including supplier information, maximum image size, color
It is arranged, manufacturer pre-sets, the limitation of frequency range and display name and the character string of sequence number etc..
HDMI, high-definition multimedia interface (English: High Definition Multimedia Interface) are
A kind of full digitisation image and sound transmit interface, can transmit the audio signal and vision signal of no compression.HDMI can be used for
Set-top box, DVD player, PC, holder for TV playing, integrated amplifier, numerical digit sound equipment and television set.
DVI (Digital Visual Interface), i.e. digital visual interface.It is 1999 by Silicon
Common group of the companies such as Image, Intel (Intel), Compaq (Compaq), IBM, HP (Hewlett-Packard), NEC, Fujitsu (Fujitsu)
The interface standard released at DDWG (Digital Display Working Group, number display working group).
Fig. 1 shows a kind of reality of the electromagnetic interference (EMI) emissions method of adjustment of display device interfaces provided in an embodiment of the present invention
Existing process.For ease of description, only parts related to embodiments of the present invention are shown, and details are as follows:
In step s101, when detecting that pixel clock frequency is greater than or equal to the first predeterminated frequency value, first is read
Extending display identification data.
Preferably, the first extending display identification data are obtained from HDMI interface or DVI interface.
Specifically, when detecting that pixel clock frequency is greater than or equal to a certain specific frequency values, electromagnetic interference (EMI) emissions
More than warning value, at this point, reading the first extending display identification data (EDID) from HDMI or DVI interface.Wherein, the first default frequency
Rate value is set according to the model of product, version and other demands.
In step s 102, the first extending display identification data are adjusted according to look-up table, obtain second and expands
Open up display identification data.
Specifically, in look-up table there are extending display identification data to think corresponding multi-group data, according to pre-set number
According to corresponding relationship, the data in look-up table are called, to obtain new extending display identification data.
In step s 103, new pixel clock frequency is exported according to the second extending display identification data.
Preferably, the new pixel clock frequency value is greater than the second predeterminated frequency value and less than the first predeterminated frequency
Value.
Specifically, the second extending display identification data obtained after data point reuse, output pixel clock frequency value
It is greater than the second predeterminated frequency value and default less than the new pixel clock frequency within the scope of the first predeterminated frequency value, such as desirable second
Frequency values are 138MHZ, and the first predeterminated frequency value is 148MHZ, and the first predeterminated frequency value and the second predeterminated frequency value can bases
Actual demand is set.
The first extending display identification data are adjusted according to look-up table Fig. 2 shows provided in an embodiment of the present invention
It is whole, obtain the implementation process of the second extending display identification data.For ease of description, it illustrates only related to the embodiment of the present invention
Part, details are as follows:
In step s 201, parameter tune corresponding with the connecter type of the display device interfaces in the look-up table is obtained
Whole value.
In step S202, had according to parameter adjustment value adjustment row effective pixel data, horizontal blanking length data, field
Imitate pixel data or field blanking length data.
Preferably, in the case that valid pixel size of being expert at is constant, horizontal blanking length data is adjusted according to the look-up table.
Preferably, in the case that valid pixel size on the scene is constant, field blanking length data is adjusted according to the look-up table.
Specifically, obtain look-up table in row effective pixel data H Active, horizontal blanking length data H Blanking,
Field effective pixel data H Active and field blanking length data V Blanking, the corresponding pixel clock frequency of this four data
Rate is greater than the second predeterminated frequency value and less than the first predeterminated frequency value, carries out to horizontal blanking length data, field blanking length data
Adjustment, can also be adjusted this four data according to setting, so that this corresponding pixel clock frequency of four data is big
In the second predeterminated frequency value and less than the first predeterminated frequency value.
Alternatively it is also possible to which row effective pixel data, horizontal blanking length data, the effective picture in field is arranged in a lookup table in advance
Prime number accordingly and field blanking length data, is adjusted this four data, obtains the second extending display identification data.
Embodiment in order to better understand the present invention illustrates implementation of the present invention below by a specific application scenarios
Example:
Display device interfaces are HDMI interface, and the first predeterminated frequency value is set as 148MHZ, the setting of the second predeterminated frequency value
The first extending display identification data are read when detecting that pixel clock frequency is greater than or equal to 148MHZ for 138MHZ
(EDID)；The first extending display identification data (EDID) are adjusted according to look-up table, that is, by row effective pixel data H
Active remains 1920pixel, horizontal blanking length data H Blanking is adjusted to 160pixel, field effective pixel data V
Active remains 1080line and field blanking length data V Blanking is adjusted to 31line, to obtain the second extension
Display identification data (EDID)；New pixel clock frequency is exported according to the second extending display identification data (EDID)
138.5MHZ, pixel clock frequency are measured by test equipment, and pixel clock frequency is excessively high to cause electromagnetic interference too strong, need to lead to
Test equipment observation signal waveform is crossed to judge.
It can be seen that the embodiment of the present invention from above-mentioned application scenarios and detect that pixel clock frequency is greater than or equal to by working as
When the first predeterminated frequency value, the first extending display identification data are read；According to look-up table to the first extending display identification data into
Row adjustment, obtains the second extending display identification data；New pixel clock is exported according to the second extending display identification data
Frequency.The present invention is by the adjustment to pixel clock frequency, to realize low cost, efficient inhibition electromagnetic interference (EMI) emissions.
Fig. 3 shows a kind of knot of the electromagnetic interference (EMI) emissions adjustment device of display device interfaces provided in an embodiment of the present invention
Composition.For ease of description, only parts related to embodiments of the present invention are shown, and details are as follows:
A kind of electromagnetic interference (EMI) emissions adjustment device of display device interfaces includes read module 301, adjustment module 302, defeated
Module 303 out.
Read module 301 is used to read the when detecting that pixel clock frequency is greater than or equal to the first predeterminated frequency value
One extending display identification data.
Preferably, the first extending display identification data are obtained from HDMI interface or DVI interface.
Specifically, when read module 301 detects that pixel clock frequency is greater than or equal to a certain specific frequency values, electricity
Magnetic disturbance radiation is more than warning value, at this point, reading the first extending display identification data (EDID) from HDMI or DVI interface.Wherein,
First predeterminated frequency value is set according to the model of product, version and other demands.
Further, adjustment module 302 is used to be adjusted the first extending display identification data according to look-up table,
Obtain the second extending display identification data.
Specifically, in look-up table there are extending display identification data to think corresponding multi-group data, adjusts module 302 according to pre-
The data corresponding relationship being first arranged calls the data in look-up table, to obtain new extending display identification data.
Further, output module 303 is used to export new pixel clock frequency according to the second extending display identification data.
Preferably, the new pixel clock frequency value is greater than the second predeterminated frequency value and less than the first predeterminated frequency
Value.
Specifically, the second extending display identification data obtained after data point reuse, output pixel clock frequency value
It is greater than the second predeterminated frequency value and default less than the new pixel clock frequency within the scope of the first predeterminated frequency value, such as desirable second
Frequency values are 138MHZ, and the first predeterminated frequency value is 148MHZ, and the first predeterminated frequency value and the second predeterminated frequency value can bases
Actual demand is set.
Fig. 4 shows the structure chart of adjustment module 302 provided in an embodiment of the present invention.For ease of description, it illustrates only
Part related to the embodiment of the present invention, details are as follows:
Adjusting module 302 includes acquiring unit 401, adjustment unit 402.
Acquiring unit 401 is for obtaining parameter corresponding with the connecter type of the display device interfaces in the look-up table
Adjusted value.
Further, adjustment unit 402 is used for long according to parameter adjustment value adjustment row effective pixel data, horizontal blanking
Degree evidence, field effective pixel data or field blanking length data.
Preferably, adjustment unit 402 be specifically used for be expert at valid pixel size it is constant in the case where, according to the look-up table
Adjust horizontal blanking length data.
Preferably, adjustment unit 402 be specifically used for valid pixel size on the scene it is constant in the case where, according to the look-up table
Adjust field blanking length data.
Specifically, acquiring unit 401 obtains row effective pixel data H Active, horizontal blanking length data in look-up table
H Blanking, field effective pixel data H Active and field blanking length data V Blanking, this four data are corresponding
Pixel clock frequency be greater than the second predeterminated frequency value and less than the first predeterminated frequency value, to horizontal blanking length data, field blanking
Length data is adjusted, and can also be adjusted according to setting to this four data, so that this corresponding picture of four data
Plain clock frequency is greater than the second predeterminated frequency value and less than the first predeterminated frequency value.
Alternatively it is also possible to which row effective pixel data, horizontal blanking length data, the effective picture in field is arranged in a lookup table in advance
Prime number accordingly and field blanking length data, is adjusted this four data, obtains the second extending display identification data.
Embodiment in order to better understand the present invention illustrates implementation of the present invention below by a specific application scenarios
Example:
Display device interfaces are HDMI interface, and the first predeterminated frequency value is set as 148MHZ, the setting of the second predeterminated frequency value
The first extension display mark is read when read module 301 detects that pixel clock frequency is greater than or equal to 148MHZ for 138MHZ
Know data (EDID)；Adjustment module 302 is adjusted the first extending display identification data (EDID) according to look-up table, that is, will
Row effective pixel data H Active remains 1920pixel, horizontal blanking length data H Blanking is adjusted to 160pixel,
Field effective pixel data V Active remains 1080line and field blanking length data V Blanking is adjusted to 31line,
To obtain the second extending display identification data (EDID)；Output module 303 is according to the second extending display identification data
(EDID) new pixel clock frequency 138.5MHZ is exported, pixel clock frequency is measured by test equipment, pixel clock frequency
It is excessively high to cause electromagnetic interference too strong, it needs to judge by test equipment observation signal waveform.
It can be seen that the embodiment of the present invention from above-mentioned application scenarios and detect that pixel clock frequency is greater than or equal to by working as
When the first predeterminated frequency value, read module 301 reads the first extending display identification data；Module 302 is adjusted according to look-up table pair
First extending display identification data are adjusted, and obtain the second extending display identification data；Output module 303 is according to described second
Extending display identification data export new pixel clock frequency.The present invention is low to realize by the adjustment to pixel clock frequency
Cost, efficient inhibition electromagnetic interference (EMI) emissions.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or replace
It changes, these modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with right
It is required that protection scope subject to.
Claims (10)
1. a kind of electromagnetic interference (EMI) emissions method of adjustment of display device interfaces, which is characterized in that the electromagnetic interference (EMI) emissions adjustment side
Method includes:
When detecting that pixel clock frequency is greater than or equal to the first predeterminated frequency value, the first extending display identification data are read；
When detecting that pixel clock frequency is greater than or equal to a certain specific frequency values, electromagnetic interference (EMI) emissions are more than warning value, from interface
Read the first extending display identification data；
The first extending display identification data are adjusted according to look-up table, obtain the second extending display identification data；It is right
Horizontal blanking length data, field blanking length data are adjusted, or according to setting to row effective pixel data, horizontal blanking length number
It is adjusted according to, field effective pixel data and field blanking length data；
New pixel clock frequency is exported according to the second extending display identification data.
2. electromagnetic interference (EMI) emissions method of adjustment as described in claim 1, which is characterized in that described to detect pixel clock frequency
When rate is greater than or equal to the first predeterminated frequency value, reading the first extending display identification data includes:
The first extending display identification data are obtained from HDMI interface or DVI interface.
3. electromagnetic interference (EMI) emissions method of adjustment as described in claim 1, which is characterized in that it is described according to look-up table to described
One extending display identification data are adjusted, and are obtained the second extending display identification data and are included:
Obtain parameter adjustment value corresponding with the connecter type of the display device interfaces in the look-up table；
Row effective pixel data, horizontal blanking length data, field effective pixel data or field are adjusted according to the parameter adjustment value
Blanking length data.
4. electromagnetic interference (EMI) emissions method of adjustment as claimed in claim 3, which is characterized in that described according to the parameter adjustment value
Adjust row effective pixel data, horizontal blanking length data, field effective pixel data or field blanking length data, comprising:
In the case that effective pixel data of being expert at size is constant, horizontal blanking length data is adjusted according to the parameter adjustment value；
In the case that effective pixel data size on the scene is constant, field blanking length data is adjusted according to the parameter adjustment value.
5. electromagnetic interference (EMI) emissions method of adjustment as described in claim 1, which is characterized in that the new pixel clock frequency takes
Value is greater than the second predeterminated frequency value and less than the first predeterminated frequency value.
6. a kind of electromagnetic interference (EMI) emissions of display device interfaces adjust device, which is characterized in that the electromagnetic interference (EMI) emissions adjustment
Device includes:
Read module, for when detecting that pixel clock frequency is greater than or equal to the first predeterminated frequency value, reading the first extension
Display identification data；When detecting that pixel clock frequency is greater than or equal to a certain specific frequency values, electromagnetic interference (EMI) emissions are more than
Warning value reads the first extending display identification data from interface；
Module is adjusted, for being adjusted according to look-up table to the first extending display identification data, it is aobvious to obtain the second extension
Show mark data；Horizontal blanking length data, field blanking length data are adjusted, or according to setting to row valid pixel number
According to, horizontal blanking length data, field effective pixel data and field blanking length data be adjusted；
Output module, for exporting new pixel clock frequency according to the second extending display identification data.
7. electromagnetic interference (EMI) emissions as claimed in claim 6 adjust device, which is characterized in that the read module is specifically used for:
The first extending display identification data are obtained from HDMI interface or DVI interface.
8. electromagnetic interference (EMI) emissions as claimed in claim 6 adjust device, which is characterized in that the adjustment module includes:
Acquiring unit, for obtaining parameter adjustment corresponding with the connecter type of the display device interfaces in the look-up table
Value；
Adjustment unit, for adjusting row effective pixel data, horizontal blanking length data, the effective picture in field according to the parameter adjustment value
Prime number evidence or field blanking length data.
9. electromagnetic interference (EMI) emissions as claimed in claim 8 adjust device, which is characterized in that the adjustment unit is specifically used for:
In the case that effective pixel data of being expert at size is constant, horizontal blanking length data is adjusted according to the parameter adjustment value；
In the case that effective pixel data size on the scene is constant, field blanking length data is adjusted according to the parameter adjustment value.
10. electromagnetic interference (EMI) emissions as claimed in claim 6 adjust device, which is characterized in that the new pixel clock frequency
Value is greater than the second predeterminated frequency value and less than the first predeterminated frequency value.
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| US8487945B2 (en) * | 2008-09-11 | 2013-07-16 | Dell Products L.P. | Methods for setting a pixel clock frequency |
| CN102117189A (en) * | 2010-01-06 | 2011-07-06 | 宏碁股份有限公司 | Electronic device and pixel clock frequency regulation method |
| CN104170287A (en) * | 2012-01-04 | 2014-11-26 | 摩托罗拉移动有限责任公司 | Method and apparatus to prevent receiver desensitization from radiated hdmi signals in accessory or computing devices |
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Effective date of registration: 20201216 Address after: 239000 No. 101, Suchu Avenue, Chuzhou economic and Technological Development Zone, Anhui Province Patentee after: Chuzhou Huike Photoelectric Technology Co.,Ltd. Address before: 230012 northeast corner of the intersection of Jiudingshan road and Kuihe Road, Xinzhan District, Hefei City, Anhui Province Patentee before: HEFEI HUIKE JINYANG TECHNOLOGY Co.,Ltd. |