CN107068111A

CN107068111A - A kind of solution LVDS signals produce the method and system of electromagnetic radiation

Info

Publication number: CN107068111A
Application number: CN201710298626.9A
Authority: CN
Inventors: 丁锦俊
Original assignee: NANJING CEC PANDA HOUSEHOLD APPLIANCES CO Ltd; Nanjing Panda Electronics Co Ltd
Current assignee: NANJING CEC PANDA HOUSEHOLD APPLIANCES CO Ltd; Nanjing Panda Electronics Co Ltd
Priority date: 2017-04-25
Filing date: 2017-04-25
Publication date: 2017-08-18

Abstract

Solved the invention provides a kind of by software mode because LVDS produces the method and system of electromagnetic radiation, method includes step：(1) centre frequency and normal operating frequency range of original LVDS clock works are determined；(2) centre frequency and normal operating frequency range determined according to step (1), the clock frequency for exporting the random fluctuation in normal operating frequency range of LVDS clock frequencies is realized by software programming.Correspondingly, the invention provides a kind of system, the present invention passes through software programming, so that the centre frequency of original LVDS clock works is changed into wiggly clock frequency, the emittance of clock is scatter many points, and some frequency is not concentrated, produces similar square wave type, so measuring emittance can also disperse, and greatly reduce radiation intensity.Technical solution of the present invention is simple, and workload is small, and it is easy to realize.It is not only to save manufacturer production cost, realizes simple.

Description

A kind of solution LVDS signals produce the method and system of electromagnetic radiation

Technical field

The present invention relates to a kind of method and system that electromagnetic radiation is solved by software, it is related to all liquid crystal on the market TV and similar LVDS produce electromagnetic radiation scheme, by my this method so as to solving to ask because LVDS produces interference electromagnetic radiation Topic, reduces production cost.

Background technology

As LCD TV is popularized in Modern Family, people's living standard improve constantly, it is healthy increasingly Pay attention to, as long as there is electrical equipment, radiation will be produced, LCD TV radiation must be qualified, meet national electromagnetic interference standard, electromagnetism is done It is one important indicator of national standard to disturb index.Television set is made up of screen and two significant components of board, liquid crystal display displays images, LVDS signals must be produced by board to liquid crystal display, have one group of clock signal in wherein LVDS, it is to produce one weight of radiation Interference source is wanted, typically all peripheral components (such as magnet ring increase, shielding measure) mode is handled, and can so cause cost to increase, work The increase of skill difficulty.

The content of the invention

Goal of the invention：The purpose of the present invention is in order to by the way that software mode solution is because of the method for LVDS generation electromagnetic radiation and is System.The present invention neither influences normal display image, and does not increase peripheral material, so as to solve TV radiation excessive problem, saves Manufacturer production cost.

Technical scheme：

A kind of method that solution LVDS signals produce electromagnetic radiation, including step：

(1) centre frequency and normal operating frequency range of original LVDS clock works are determined；

(2) centre frequency and normal operating frequency range determined according to step (1), computer random selection LVDS clocks Clock frequency output of the frequency in normal operating frequency range.

In the step (2), the centre frequency and normal operating frequency range determined according to step (1) determines each cycle Clock offset, computer export wiggly clock frequency in LVDS clock frequency normal operating frequency ranges.

The output that control routine realizes satisfactory clock frequency is write by software programming in the computer.

The each cycle clock offset is determined with specific reference to actual operating frequency scope.

The system that a kind of solution LVDS signals produce electromagnetic radiation, including acquisition module, computing module and performing module； The acquisition module obtains original LVDS clock works centre frequency and the scope of frequency fluctuation by reference to the specifications of screen；Institute The scope for stating original LVDS clock works centre frequency that computing module obtains according to the acquisition module and frequency fluctuation is determined Each cycle clock offset；The performing module according to determined by the acquisition module and the computing module content with center Realize that LVDS clock frequencies increase and decrease back and forth repeatedly on the basis of frequency, form wiggly clock frequency.

The acquisition module is barcode scanning equipment or mobile phone terminal, and barcode scanning equipment is obtained by scanning associated television Quick Response Code The original LVDS clock works centre frequency of TV and the scope of frequency fluctuation；Mobile phone terminal obtains above-mentioned letter by internet checking Breath.

The computing module and performing module are set in a computer, and writing code by way of software programming forms.

Beneficial effect：The present invention passes through software programming so that the centre frequency of original LVDS clock works is changed into left and right The clock frequency waved, the emittance of clock is scatter many points, and some frequency is not concentrated, similar square wave type is produced, then Measuring emittance can also disperse, and greatly reduce radiation intensity.Technical solution of the present invention is simple, and workload is small, and it is easy to realize. It is not only to save manufacturer production cost, realizes simple.

Brief description of the drawings

Fig. 1 is clock signal in LVDS signals using the electromagnetic radiation diagram produced by fixed clock frequency.

Fig. 2 is clock signal in LVDS signals using the electromagnetic radiation diagram produced by clock of vacillating now to the left, now to the right.

Fig. 3 is LVDS clock frequency sets flow chart of the present invention.

Embodiment

The present invention is further described below in conjunction with the accompanying drawings.

The technical scheme is that reached by following measure, illustrated with LCD TV：

First by experimental data recognize source radiation be board produce LVDS signals in clock (frequency) signal cause 's.It is one important parameter of liquid crystal display in view of clock (frequency) signal, the specifications of reference screen, clock (frequency) has certain work Make scope, that is, error range；Conventional software screen ginseng, is all to fix to recommend a value (clock frequency) by specifications, when such as Clock 89MHz, electromagnetic radiation produces radiation 89MHz, two frequency multiplication 198MHz etc., produces electromagnetic radiation as shown in figure 1, emittance is strong Degree is very strong, is a point punching, it is not easy to solve.

Secondly, according to pendulum clock principle, realized by software mode, such as, and clock (frequency) on the basis of central point, when Clock (frequency) left direction is moved, and every 1 microsecond is a cycle, and shifting moves a step, and reduces 30KHz, and mobile 100 steps, centre frequency subtracts 3000KHz is lacked；Then move right, every 1 microsecond is moved and moved a step, increase 30KHz, mobile 100 steps return to centre frequency, then Move right 100 steps, and centre frequency adds 3000KHz；Then it is moved to the left, again and again, just as wiggly clock. Amplitude peak is clock maximum clock offset, is 3000KHz；Ensure that LVDS clocks (frequency) increase or decrease maximum offset Within normal range of operation, so that realizing does not influence image normally to show, electromagnetism can be also solved very well all the time for clock afterwards Radiation interference source, many points because the emittance of clock can just scatter do not concentrate some frequency, produce similar square wave Type.Measuring emittance can also disperse, and greatly reduce radiation intensity.

Finally, by way of software program is compiled, LVDS is produced clock (frequency) and is divided into clock of vacillating now to the left, now to the right (frequency Rate), and be operated within the scope of normal frequency, in write-in software, so as to fundamentally solve LVDS signal clocks (frequency) Radiation is produced, by test data of experiment as shown in Fig. 2 electromagnetic radiation index test is qualified, meeting national electromagnetic compatibility will Seek standard.

In the present invention, LVDS can also be produced into clock (frequency) and be set to by way of software program is compiled The working frequency determined at random within the normal operating frequency range of LVDS signal clocks.

Present invention also offers a kind of system for realizing the above method, including acquisition module, computing module and execution mould Block；The acquisition module obtains original LVDS clocks (frequency) operating center frequency and frequency fluctuation by reference to the specifications of screen Scope；Original LVDS clocks (frequency) operating center frequency and frequency that the computing module is obtained according to the acquisition module The scope of fluctuation determines each cycle clock offset；The performing module is true according to the acquisition module and computing module institute Fixed content realizes that LVDS clock frequencies increase and decrease back and forth repeatedly on the basis of centre frequency, forms wiggly clock frequency.

In the present invention, the acquisition module is but is not limited to barcode scanning equipment or mobile phone terminal, and barcode scanning equipment is by sweeping Retouch the scope that associated television Quick Response Code obtains original LVDS clocks (frequency) operating center frequency of TV and frequency fluctuation；Mobile phone is whole End obtains above- mentioned information by internet checking.The computing module and performing module are set in a computer, are compiled by software The mode of journey writes code and formed.

Specific embodiment：

First, original LVDS clocks (frequency) operating center frequency is determined, then determines the scope of frequency fluctuation, such as SD Shield 1366*768 screens, LVDS center operating frequencies 82MHz, minimum 79MHz, maximum 85MHz.

Next, then on the basis of centre frequency, it is determined that per moved further 30KHz, 100 steps are walked to the left, and equal proportion is reduced, just It is to reduce to 79MHz well, 200 steps is walked to the right, the increase of frequency equal proportion just increases to 85MHz, and such LVDS clock frequencies are anti- It is multiple to increase and decrease back and forth, do not fix.

Finally, code is write by way of software programming, the frequency of output is not just fixed, and Hui centers or so are partially Move, do not influence image normally to show, electromagnetic radiation also will not be exceeded, as shown in Figure 3.

Described above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should It is considered as protection scope of the present invention.

Claims

1. a kind of method that solution LVDS signals produce electromagnetic radiation, it is characterised in that：Including step：

(2) centre frequency and normal operating frequency range determined according to step (1), computer random selection LVDS clock frequencies Clock frequency output in normal operating frequency range.

2. according to the method described in claim 1, it is characterised in that：In the step (2), the center determined according to step (1) Frequency and normal operating frequency range, determine each cycle clock offset, computer export is in LVDS clock frequency normal works Wiggly clock frequency in frequency range.

3. method according to claim 1 or 2, it is characterised in that：Write and controlled by software programming in the computer Code realizes the output of satisfactory clock frequency.

4. according to the method described in claim 1, it is characterised in that：The each cycle clock offset is with specific reference to real work Frequency range is determined.

5. a kind of system of application claim 1 methods described, it is characterised in that：Including acquisition module, computing module and hold Row module；The acquisition module obtains original LVDS clock works centre frequency and frequency fluctuation by reference to the specifications of screen Scope；Original LVDS clock works centre frequency and the model of frequency fluctuation that the computing module is obtained according to the acquisition module Enclose determination each cycle clock offset；Performing module content according to determined by the acquisition module and the computing module Realize that LVDS clock frequencies increase and decrease back and forth repeatedly on the basis of centre frequency, form wiggly clock frequency.

6. system according to claim 5, it is characterised in that：The acquisition module be barcode scanning equipment or mobile phone terminal, Barcode scanning equipment obtains the model of the original LVDS clock works centre frequency of TV and frequency fluctuation by scanning associated television Quick Response Code Enclose；Mobile phone terminal obtains above- mentioned information by internet checking.

7. system according to claim 5, it is characterised in that：The computing module and performing module are arranged on computer In, by way of software programming writing code forms.