CN106160759A - A kind of lcd screen method to Radio frequency interference solving terminal - Google Patents

Abstract

This application discloses a kind of lcd screen method to Radio frequency interference solving terminal, the service feature caused Radio frequency interference to solve screen declines problem.Comprise determining that terminal screen selectable MIPI work clock and its disturb frequency accordingly；Dynamically configuring the MIPI clock of described terminal screen, the interference frequency making the MIPI clock of configuration produce will not overlap with the working frequency points of current operation mode；The screen carrying out terminal according to the MIPI clock of configuration shows.Application the application, it is possible to promote voice quality, improves data service rate, expands base station range.

Description

A kind of lcd screen method to Radio frequency interference solving terminal

Technical field

The application relates to communication technical field, particularly to a kind of lcd screen side to Radio frequency interference solving terminal Method.

Background technology

Along with the development of communication technology, the mode of operation of mobile phone terminal gets more and more.Current civilian mobile phone terminal is Five mould ten frequencies or five moulds 14 frequency occur, supports global roaming.

Network schemer	Working frequency range	Up (terminal is sent out)	Descending (terminal receipts)
				TD-LTE	40	2300-2400MHz	2300-2400MHz
TD-LTE	38	2570-2620MHz	2570-2620MHz
				TD-LTE	39	1880-1920MHz	1880-1920MHz
TD-LTE	41	2496-2690MHz	2496-2690MHz
				TD-SCDMA/TD-HSPA	34	2010-2025MHz	2010-2025MHz
TD-SCDMA/TD-HSPA	39	1880-1920MHz	1880-1920MHz
				GSM/GPRS/EDGE	8	880-915MHz	925-960MHz
GSM/GPRS/EDGE	3	1710-1785MHz	1805-1880MHz
				GSM/GPRS/EDGE	2	1850-1910MHz	1930-1990MHz
GSM/GPRS/EDGE	5	824-849MHz	869-894MHz
				LTE FDD	7	2500-2570MHz	2620-2170MHz
LTE FDD	1	1920-1980MHz	2110-2170MHz
				LTE FDD	3	1710-1785MHz	1805-1880MHz
LTE FDD	3	704-716MHz	734-746MHz
				LTE FDD	4	1710-1755MHz	2110-2155MHz
LTE FDD	20	832-862MHz	791-821MHz
				WCDMA/HSPA	1	1920-1980MHz	2110-2170MHz
WCDMA/HSPA	2	1850-1910MHz	1930-1990MHz
				WCDMA/HSPA	5	824-849MHz	869-894MHz

Table 1

From table 1, these frequency ranges are all at more than 700MHz.Test finds, for common transmitter receiver or the small screen Terminal, generally uses the concurrently or sequentially data-interface of low speed due to LCD display, and data-interface rate reduction is right The terminal flexibility impact being operated in 300～500MHz frequency ranges is less.But for large-size screen monitors LCD, typically now use MIPI serial data line transmits LCD data, and its speed is the highest, is at this moment sent to the MIPI data transmission of screen Very big on terminal radio frequency sensitivity impact, such as being operated in the terminal of frequency near 400MHz, its interference is right The sensitivity impact even more than 10dB of terminal.

The MIPI data line signal feature of LCD in lower surface analysis Fig. 1 once.Between MIPI data sub-pixel There is similarity, therefore there is certain relation in MIPI interference and MIPI clock, and interference frequency is the most satisfied:

F_interference=m*f_mipi_clock/4

Or

F_interference=m*f_mipi_clock/12

For supporting the terminal of wideband, if carrier operation frequency relatively low (near 400MHz), when lcd screen point Time bright, some frequencies of eating dishes without rice or wine there is severe jamming.When the working frequency points of terminal overlaps with interference frequency, it may appear that language The problems such as sound quality is poor, coverage distance contraction.

In prior art, evading the interference of LCD generally has two measures:

1, traditional small-screen LED, uses low-speed parallel or serial line interface, so relatively low due to data rate own, It is less that its higher harmonic components falls into carrier operation band self-energy；

2, terminal works frequency range is the widest, such as CDMA450MHz terminal, i.e. uses large-size screen monitors, owing to carrier bandwidths only has About 10MHz, can make the frequency of interference stagger working frequency points with one MIPI speed of factory setting.

But, for wideband terminal, use aforesaid way all cannot evade the interference of LCD in wideband terminal.Specifically, When terminal needs to realize wideband, owing to harmonic component is more, it is impossible to evade this by the MIPI clock of factory setting Interference, it is therefore desirable to realize the MIPI clock of dynamic modulation LCD, it is ensured that LCD can normally work, bright screen speed Being unaffected, terminal signal quality of eating dishes without rice or wine is unaffected simultaneously.

Summary of the invention

This application provides a kind of lcd screen method to Radio frequency interference solving terminal, it is possible to avoid LCD clock For the impact of terminal radio frequency signal quality, use too particularly with wideband terminal.

For achieving the above object, the application adopts the following technical scheme that:

A kind of lcd screen method to Radio frequency interference solving terminal, including:

Determine the working frequency points of the current standard of terminal, and determine that terminal screen selectable MIPI work clock and its are corresponding Interference frequency；

Dynamically configure the MIPI clock of described terminal screen, and the interference frequency that the MIPI clock of configuration produces is with current The working frequency points of terminal work mode is misaligned；

The screen carrying out terminal according to the MIPI clock of configuration shows.

It is preferred that the MIPI clock of the described described terminal screen of dynamic configuration includes:

Select and preserve the working frequency points with current standard to produce the MIPI clock frequency of interference, put bright screen in next time During curtain, the MIPI clock frequency of reading and saving configures described MIPI clock, or, directly utilize the MIPI selected Clock frequency configures described MIPI clock.

It is preferred that the described MIPI clock frequency selected is saved in internal memory.

It is preferred that the method farther includes: the described MIPI clock frequency selected is saved in NV, in institute State after terminal restarts, from described NV, read described MIPI clock frequency, be used for configuring described MIPI clock.

It is preferred that the method farther includes: each standard that counterpart terminal is supported in advance, preserve its corresponding LCD MIPI work clock and interference frequency；

When configuring described MIPI clock, for arbitrary standard of work at present, select the working frequency points to this standard not Each MIPI clock frequency of interference can be produced, constitute the MIPI clock config set of described arbitrary standard；And determine work as The common subset of the MIPI clock config set of all standards of front work, selects described from described common subset MIPI clock configures.

As seen from the above technical solution, in the application, determine that terminal screen selectable MIPI work clock and its are corresponding Interference frequency；Dynamically configure the MIPI clock of described terminal screen, make the interference frequency that the MIPI clock of configuration produces Point will not overlap with the working frequency points of present terminal mode of operation；The screen of terminal is carried out according to the MIPI clock of configuration Display.By the dynamic configuration to MIPI clock, thus ensure to evade under a plurality of modes of operation the interference of LCD, Can effectively solve large-size screen monitors LCD to disturb less than the radiofrequency signal of 700MHz frequency terminal being operated in, promote voice quality, Improve data service rate, expand base station range.

Accompanying drawing explanation

Fig. 1 is the MIPI data line signal feature schematic diagram of LCD；

Fig. 2 is the lcd screen solving terminal in the application schematic flow sheet to radio frequency interference method.

Detailed description of the invention

In order to make the purpose of the application, technological means and advantage clearer, below in conjunction with accompanying drawing to this Shen Please be described in further details.

Fig. 2 is the lcd screen solving terminal in the application schematic flow sheet to radio frequency interference method.Such as Fig. 2 Shown in, the method includes:

Step 201, determines the working frequency points of the current operation mode of terminal, and determines the selectable MIPI of terminal screen Clock and disturb frequency accordingly.

Terminal start for the first time can use the LCD MIPI clock of acquiescence, for TMO pattern, when terminal becomes After merit access network, working frequency points can be notified AP by CP；For DMO pattern, working frequency points is directly recorded in AP side.Working frequency points can be notified drive software by the high layer software of AP, and working frequency points is preserved by drive software So that terminal uses after restarting in NV.

Step 202, the MIPI clock of dynamic configurating terminal screen, make the interference that the MIPI clock of configuration is corresponding Frequency is misaligned with the working frequency points of current operation mode.

Specifically, select and preserve clock frequency when the working frequency points with current operation mode will not produce the MIPI of interference Rate, the interference frequency that namely MIPI clock frequency is corresponding will not overlap with the working frequency points of current operation mode. If directly revising MIPI clock when hardware supported LCD is lighted, then drive software selects one according to working frequency points Individual glitch-free clock, direct collocating LCD MIPI clock.Otherwise the MIPI clock selected is entered by drive software Row preserves, the MIPI clock frequency configuration MIPI clock of reading and saving during wait LCD bright screen next time.

When preserving the MIPI clock frequency selected, it is preferable that can save it in a memory address, As such, it is possible to directly read MIPI clock frequency configuration MIPI clock from internal memory.Here, from internal memory rather than NV reads configuration, is to ensure that quick bright screen.

Further, it is also possible to the MIPI clock frequency selected also is saved in NV, so, terminal weight Qi Shi, in the fastboot stage, drive software can read the MIPI clock of LCD from NV, such as NV value Invalid, use default configuration.

It addition, when terminal supports multiple standard, can the working frequency points of corresponding every kind of standard, finding out it can make MIPI clock config set, then take the common subset of each standard result.High layer software notice drive software is worked as Which standard front is at offline mode, and which standard is in work.Drive software calculates according to the standard of work, And then find out suitable LCD MIPI clock.

Step 203, the screen carrying out terminal according to the MIPI clock of configuration shows.

So far, the method flow in the application terminates.Select the MIPI clock that screen shows by the way, It can be avoided that the interference to terminal radio frequency.

Said method is described below as a example by utilizing software mode to realize said method in the terminal.

One, new interface is introduced:

1, provide two NV items, record the information of TMO and DMO respectively, including this equipment whether Use and current frequency point information；

2, LCD drives provides two device nodes, records the information of TMO and DMO the most respectively, Whether use including this equipment and current frequency point information；

Device node is character string forms, and form is half-angle character for " work_mode:freq " colon, eg.”0:394.8”

Two, idiographic flow

Step 1, actual measurement interference frequency table, make a record.

The clock frequency table of actual measurement is as shown in table 2, represents LCD MIPI clock speed.

172.8

182.4

192

201.6

211.2

220.8

230.4

240

249.6

259.2

268.8

Table 2

Table 3 is corresponding interference frequency

230.4	243.2	256	268.8	281.6	294.4	307.2	320	332.8	345.6	358.4
											244.8	258.4	272	285.6	299.2	312.8	326.4	340	353.6	367.2	380.8
259.2	273.6	288	302.4	316.8	331.2	345.6	360	374.4	388.8	403.2
											273.6	288.8	304	319.2	334.4	349.6	364.8	380	395.2	410.4	425.6
288	304	320	336	352	368	384	400	416	432	448
											302.4	319.2	336	352.8	369.6	386.4	403.2	420	436.8	453.6	470.4
316.8	334.4	352	369.6	387.2	404.8	422.4	440	457.6	475.2	492.8
											331.2	349.6	368	386.4	404.8	423.2	441.6	460	478.4	496.8	515.2
345.6	364.8	384	403.2	422.4	441.6	460.8	480	499.2	518.4	537.6
											360	380	400	420	440	460	480	500	520	540	560
374.4	395.2	416	436.8	457.6	478.4	499.2	520	540.8	561.6	582.4
											388.8	410.4	432	453.6	475.2	496.8	518.4	540	561.6	583.2	604.8
403.2	425.6	448	470.4	492.8	515.2	537.6	560	582.4	604.8	627.2
											417.6	440.8	464	487.2	510.4	533.6	556.8	580	603.2	626.4	649.6
432	456	480	504	528	552	576	600	624	648	672
											446.4	471.2	496	520.8	545.6	570.4	595.2	620	644.8	669.6	694.4

Table 3

Step 2, Fastboot

Read the NV item of TMO and DMO, determine MIPI according to TMO and DMO mode of operation and center frequency point Clock initial value, initializes MIPI clock, and by order line, this configuration is passed to kernel.

Step 3, Kernel

The configuration that Kernel is transmitted through according to order line initializes MIPI clock.When device node has write, root According to mode of operation and the frequency of TMO and DMO, recalculating MIPI clock and preserve, next time, bright screen was stylish Configuration take-effective.

Only DMO work time, according to configuration frequency evade frequency meter such as table 4, due to DMO band Wide little, it is only necessary to avoid several noise spot, other frequency default configuration.

DMO frequency	MIPI Clock
		Acquiescence frequency	240
(419.5-420.5)	192
		(439.5-440.5)	192
(459.5-460.5)	192

Table 4

During only TMO work, the frequency meter such as table 5 evaded according to center frequency point.

Table 5

When DMO Yu TMO works simultaneously, need to calculate the public affairs of two kinds of standards according to interference frequency table Subset altogether.

Such as DMO frequency falls and falls at (380,394.8) MHz at (419.5,420.5) MHz, TMO frequency, then The 192MHz in DMO allocation list or the most not all right by the 240MHz in TMO allocation list pressed by MIPI clock.

Frequency according to DMO is tabled look-up, MIPI clock optional [172.8,182.4,192.0,211.2,220.8, 230.4、249.6、259.2、268.8]MHz。

Frequency according to TMO is tabled look-up, and MIPI clock may select [182.4,240.0,249.6] MHz.

Take the common subset of DMO and TMO, then MIPI clock may be selected to be 182.4MHz or 249.6MHz.

If common subset is empty, then report and alarm, it is desirable to user adjusts DMO frequency.

Step 4, RIL:

1, RIL is when issuing offline mode to TMO or DMO, will update NV and LCD device simultaneously The work_mode field of nodal information.Note first reading the configuration of current frequency when updating and writing back by initial value.

2, RIL receives the CSG information that TMO reports, if frequency point information changes, new value of frequency point is write Corresponding NV item and the device node of the soft offer in the end；

3, when RIL configures DMO frequency, new value of frequency point is write the equipment joint of corresponding NV item and the soft offer in the end Point.

Implementing of the screen display method of the above-mentioned the application of being terminal.From above-mentioned, the application can have Effect solves large-size screen monitors LCD and disturbs less than the radiofrequency signal of 700MHz frequency terminal being operated in, and promotes voice quality, Improve data service rate, expand base station range.

The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all in the present invention Spirit and principle within, any modification, equivalent substitution and improvement etc. done, should be included in the present invention protect Within the scope of protecting.

Claims (5)

1. the lcd screen method to Radio frequency interference solving terminal, it is characterised in that including:

Determine the working frequency points of the current standard of terminal, and determine that terminal screen selectable MIPI work clock and its are corresponding Interference frequency；

Dynamically configure the MIPI clock of described terminal screen, and the interference frequency that the MIPI clock of configuration produces is with current The working frequency points of terminal work mode is misaligned；

The screen carrying out terminal according to the MIPI clock of configuration shows.

Method the most according to claim 1, it is characterised in that the MIPI of the described described terminal screen of dynamic configuration Clock includes:

Select and preserve the working frequency points with current standard to produce the MIPI clock frequency of interference, put bright screen in next time During curtain, the MIPI clock frequency of reading and saving configures described MIPI clock, or, directly utilize the MIPI selected Clock frequency configures described MIPI clock.

Method the most according to claim 2, it is characterised in that the described MIPI clock frequency selected is protected Exist in internal memory.

The most according to the method in claim 2 or 3, it is characterised in that the method farther includes: will select Described MIPI clock frequency be saved in NV, after described terminal is restarted, from described NV, read described MIPI Clock frequency, is used for configuring described MIPI clock.

Method the most according to claim 1, it is characterised in that the method farther includes: counterpart terminal in advance Each standard supported, preserves its corresponding LCD MIPI work clock and interference frequency；

When configuring described MIPI clock, for arbitrary standard of work at present, select the working frequency points to this standard not Each MIPI clock frequency of interference can be produced, constitute the MIPI clock config set of described arbitrary standard；And determine work as The common subset of the MIPI clock config set of all standards of front work, selects described from described common subset MIPI clock configures.