CN101482659A - Terminal - Google Patents
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- CN101482659A CN101482659A CNA2008102393438A CN200810239343A CN101482659A CN 101482659 A CN101482659 A CN 101482659A CN A2008102393438 A CNA2008102393438 A CN A2008102393438A CN 200810239343 A CN200810239343 A CN 200810239343A CN 101482659 A CN101482659 A CN 101482659A
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Abstract
The invention embodiment discloses a terminal comprising a printed circuit board, a liquid crystal display screen drive chip, a liquid crystal display screen, also comprising a source terminal resistance-capacity matching circuit and a terminal filter circuit; the source terminal resistance-capacity matching circuit is used for inhibiting a reflection noise signal, limiting a common mode current of the output noise of the liquid crystal display screen drive chip, and filtering the switching noise generated by the conduction during switching the circuit inside of the liquid crystal display screen drive chip; the terminal filter circuit is used for inhibiting the noise introduced by the liquid crystal display screen bus cable and isolating the interference generated by the liquid crystal display screen drive chip side. The invention embodiment provides a terminal capable of inhibiting the electromagnetic interference of the liquid crystal display screen interface, the terminal can effectively inhibit the aerial radiation effect of the LCD bus cable, and can ensure the RE test of the terminal to satisfy the EMC standard requirement.
Description
Technical field
The present invention relates generally to a kind of terminal with LCDs, relates in particular to a kind of terminal that can suppress LCDs interface electromagnetic interference (EMI).
Background technology
Have LCD (Liquid Crystal Display, LCDs) terminal electronic product is at the EMC of the market access (Electro Magnetic Compatibility, electromagnetic compatibility) in the test, the phenomenon that antenna effect because of the soft band line of LCD causes RE (Radiated emission, radiation disturbance) radiation to exceed standard often appears.The EMC of product design in the past mainly is to adopt flat magnet ring to carry out filtering, and this method has certain inhibiting effect for simple radiation disturbance, but in antenna effect comparatively under the complicated situation, this method often can not effectively suppress the noise frequency.
FPC (Flexible PrintedCircuit is mostly adopted in the radiation that prior art 1 is drawn at LCD interface winding displacement, FPC) the winding displacement scheme that adds magnet ring suppresses, as shown in Figure 1, between LCD screen and PCB (Printed Circuit Board, printed circuit board (PCB)) circuit board, add a weight heavier flat magnet ring relatively.Also can use as shown in Figure 2 prior art 2 for the less LCD screen products in space, increase a decoupling capacitor, carry out simple Filtering Processing at interface.
The inventor finds in realizing process of the present invention, there is following shortcoming at least in prior art: the shortcoming of prior art 1 is that magnet ring volume and quality are bigger, is difficult to fixing, and most of radiation start from interface, often the discontinuous radiation problem that just caused of interface impedance; The shortcoming of prior art 2 in, only pay attention to the simple filtering of interface, often cabling has just become radiating antenna in the pcb board, and also is difficult to suppress for the noise that screen radiates.
Summary of the invention
The embodiment of the invention proposes a kind of terminal that can suppress LCDs interface electromagnetic interference (EMI), suppresses the aerial radiation effect of LCD winding displacement effectively, guarantees that the EMC standard-required is satisfied in the RE test of terminal.
The technical scheme of the embodiment of the invention is achieved in that
A kind of terminal comprises printed circuit board (PCB), LCDs chip for driving and LCDs, also comprises source end capacitance-resistance match circuit and does not hold filtering circuit;
Described source end capacitance-resistance match circuit, be used for the reflecting background signal is suppressed, limit the common mode current of described LCDs chip for driving output noise, and the switching noise that conduction produces in the contactor process of the described LCDs chip for driving of filtering inside;
The described filtering circuit of not holding is used to suppress the noise that the LCDs winding displacement is introduced, and isolates the interference that described LCDs chip for driving side produces.
The described technical scheme of the embodiment of the invention can suppress the aerial radiation effect of LCD winding displacement effectively by source end capacitance-resistance match circuit being set and not holding filtering circuit under the prerequisite that ensures signal quality, guarantee that the EMC standard-required is satisfied in the RE test of terminal; And circuit is simple, can effectively reduce cost.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the synoptic diagram that concerns of a kind of LCD interface of prior art filters solutions;
Fig. 2 is the synoptic diagram that concerns of the another kind of LCD interface of prior art filters solutions;
Fig. 3 is a kind of composition structural drawing that can suppress terminal first embodiment of LCDs interface electromagnetic interference (EMI) of the present invention;
Fig. 4 is a kind of circuit relationships figure that can suppress terminal first embodiment of LCDs interface electromagnetic interference (EMI) of the present invention;
Fig. 5 is a kind of circuit relationships figure that can suppress terminal second embodiment of LCDs interface electromagnetic interference (EMI) of the present invention;
Fig. 6 is a kind of circuit relationships figure that can suppress terminal the 3rd embodiment of LCDs interface electromagnetic interference (EMI) of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
With reference to Fig. 3, show a kind of composition structural drawing that can suppress terminal first embodiment of LCDs interface electromagnetic interference (EMI) of the present invention.Described terminal comprises: printed circuit board (PCB) 110, LCDs chip for driving 120, LCDs 130, source end capacitance-resistance match circuit 140 and do not hold filtering circuit 150.
Described source end capacitance-resistance match circuit 140 is used for the reflecting background signal is suppressed, limit the common mode current of described LCDs chip for driving 120 output noises, and the switching noise that conduction produces in the contactor process of the described LCDs chip for driving of filtering 120 inside.
The described filtering circuit 150 of not holding is used to suppress the noise that LCDs 130 winding displacements are introduced, and isolates the interference that described LCDs chip for driving 120 sides produce.
Described source end capacitance-resistance match circuit 140 is arranged on described LCDs chip for driving 120 ends, near the output pin of described LCDs chip for driving 120.
Described source end capacitance-resistance match circuit 140 comprises first resistance R 1 and first capacitor C 1.
The described filtering circuit 150 of not holding is arranged on described LCDs 130 ends, near the interface of described LCDs 130.
The described filtering circuit 150 of not holding comprises the magnetic bead LB and second capacitor C 2.
The concrete value of described first resistance R 1, first capacitor C 1, magnetic bead LB, second capacitor C 2 need be taken all factors into consideration factors such as signal quality, clock frequency, resonance frequency and adjusts, to guarantee the optimal design of signal integrity and EMC.
In embodiments of the present invention, the resistance span of described first resistance can can be 0 to 100 pico farad for the electric capacity span of 0 to 100 pico farad, described second electric capacity for 0 to 100 ohm, the electric capacity span of described first electric capacity.
Described printed circuit board (PCB) 110, LCDs chip for driving 120 and LCDs 130 all belong to existing parts in terminal, for length considers that its principle of work and the course of work embodiment of the invention no longer are described in detail.
The described technical scheme of the embodiment of the invention can suppress the aerial radiation effect of LCD winding displacement effectively by source end capacitance-resistance match circuit being set and not holding filtering circuit under the prerequisite that ensures signal quality, guarantee that the EMC standard-required is satisfied in the RE test of terminal; And circuit is simple, can effectively reduce cost.
With reference to Fig. 4, show a kind of circuit diagram that can suppress terminal first embodiment of LCDs interface electromagnetic interference (EMI) of the present invention.
Described source end capacitance-resistance match circuit 140 is arranged on described LCDs chip for driving 120 ends, near the output pin of described LCDs chip for driving 120.
Described source end capacitance-resistance match circuit 140 comprises first resistance R 1 and first capacitor C 1.
One end of described first resistance R 1 is connected with described LCDs chip for driving 120 pins, the other end of described first resistance R 1 and described first capacitor C 1 and be connected described LCDs chip for driving 120 and the transmission line of described LCDs 130 is connected.
The described filtering circuit 150 of not holding is arranged on described LCDs 130 ends, near the interface of described LCDs 130.
The described filtering circuit 150 of not holding comprises the magnetic bead LB and second capacitor C 2.
The end of described magnetic bead LB is connected with the interface of described LCDs 130 and described second capacitor C 2, and the other end of described magnetic bead LB is connected with the transmission line that is connected described LCDs chip for driving 120 and described LCDs 130.
The concrete value of described first resistance R 1, first capacitor C 1, magnetic bead LB, second capacitor C 2 need be taken all factors into consideration factors such as signal quality, clock frequency, resonance frequency and adjusts, to guarantee the optimal design of signal integrity and EMC.
In embodiments of the present invention, the resistance span of described first resistance can can be 0 to 100 pico farad for the electric capacity span of 0 to 100 pico farad, described second electric capacity for 0 to 100 ohm, the electric capacity span of described first electric capacity.
In second embodiment of a kind of terminal that can suppress LCDs interface electromagnetic interference (EMI) of the present invention, described terminal comprises: printed circuit board (PCB) 110, LCDs chip for driving 120, LCDs 130, source end capacitance-resistance match circuit 140 and do not hold filtering circuit 150.
Described source end capacitance-resistance match circuit 140 is used for the reflecting background signal is suppressed, limit the common mode current of described LCDs chip for driving 120 output noises, and the switching noise that conduction produces in the contactor process of the described LCDs chip for driving of filtering 120 inside.
The described filtering circuit 150 of not holding is used to suppress the noise that LCDs 130 winding displacements are introduced, and isolates the interference that described LCDs chip for driving 120 sides produce.
Described source end capacitance-resistance match circuit 140 is arranged on described LCDs chip for driving 120 ends, near the output pin of described LCDs chip for driving 120.
Described source end capacitance-resistance match circuit 140 comprises first resistance R 1 and first capacitor C 1.
One end of described first resistance R 1 is connected with described LCDs chip for driving 120 pins, the other end of described first resistance R 1 and described first capacitor C 1 and be connected described LCDs chip for driving 120 and the transmission line of described LCDs 130 is connected.
The described filtering circuit 150 of not holding is arranged on described LCDs 130 ends, near the interface of described LCDs 130.
Described second resistance R 2 and the 3rd capacitor C 3 of not holding filtering circuit 150 to comprise low resistance.
The described technical scheme of present embodiment is applied under the unconspicuous situation of noise characteristic, and the magnetic bead composition that the resistance of use low resistance substitutes among first embodiment is not held filtering circuit 150, thereby can reduce cost greatly.The Standard resistance range of described second resistance R 2 can be 0 to 10 ohm.Preferred in embodiments of the present invention 0 ohm resistance substitutes magnetic bead.
The concrete value of described first resistance R 1, first capacitor C 1, the 3rd capacitor C 3 need be taken all factors into consideration factors such as signal quality, clock frequency, resonance frequency and adjusts, to guarantee the optimal design of signal integrity and EMC.
In embodiments of the present invention, the resistance span of described first resistance can can be 0 to 100 pico farad for the electric capacity span of 0 to 100 pico farad, described the 3rd electric capacity for 0 to 100 ohm, the electric capacity span of described first electric capacity.
The described technical scheme of the embodiment of the invention can suppress the aerial radiation effect of LCD winding displacement effectively by source end capacitance-resistance match circuit being set and not holding filtering circuit under the prerequisite that ensures signal quality, guarantee that the EMC standard-required is satisfied in the RE test of terminal; And circuit is simple, can effectively reduce cost.
With reference to Fig. 5, show a kind of circuit diagram that can suppress terminal second embodiment of LCDs interface electromagnetic interference (EMI) of the present invention.
The described filtering circuit 150 of not holding is arranged on described LCDs 130 ends, near the interface of described LCDs 130.
Described second resistance R 2 and the 3rd capacitor C 3 of not holding filtering circuit 150 to comprise low resistance.
One end of described second resistance R 2 is connected with the interface of described LCDs 130 and described the 3rd capacitor C 3, and the other end of described second resistance R 2 is connected with the transmission line that is connected described LCDs chip for driving 120 and described LCDs 130.
The described technical scheme of present embodiment is applied under the unconspicuous situation of noise characteristic, and the magnetic bead composition that the resistance of use low resistance substitutes among first embodiment is not held filtering circuit 150, thereby can reduce cost greatly.The Standard resistance range of described second resistance R 2 can be 0 to 10 ohm.Preferred in embodiments of the present invention 0 ohm resistance substitutes magnetic bead.
The concrete value of described first resistance R 1, first capacitor C 1, the 3rd capacitor C 3 need be taken all factors into consideration factors such as signal quality, clock frequency, resonance frequency and adjusts, to guarantee the optimal design of signal integrity and EMC.
In embodiments of the present invention, the resistance span of described first resistance can can be 0 to 100 pico farad for the electric capacity span of 0 to 100 pico farad, described the 3rd electric capacity for 0 to 100 ohm, the electric capacity span of described first electric capacity.
With reference to Fig. 6, show a kind of circuit diagram that can suppress terminal the 3rd embodiment of LCDs interface electromagnetic interference (EMI) of the present invention.
Described source end capacitance-resistance match circuit 140 is arranged on described LCDs chip for driving 120 ends, near the output pin of described LCDs chip for driving 120.
Described source end capacitance-resistance match circuit 140 comprises first resistance R 1 and first capacitor C 1.
One end of described first resistance R 1 is connected with described LCDs chip for driving 120 pins, the other end of described first resistance R 1 and described first capacitor C 1 and be connected described LCDs chip for driving 120 and the transmission line of described LCDs 130 is connected.
The described filtering circuit 150 of not holding is arranged on described LCDs 130 ends, near the interface of described LCDs 130.
The described filtering circuit 150 of not holding comprises the magnetic bead LB and second capacitor C 2.
The end of described magnetic bead LB is connected with the interface of described LCDs 130 and described second capacitor C 2, and the other end of described magnetic bead LB is connected with the transmission line that is connected described LCDs chip for driving 120 and described LCDs 130.
The concrete value of described first resistance R 1, first capacitor C 1, magnetic bead LB, second capacitor C 2 need be taken all factors into consideration factors such as signal quality, clock frequency, resonance frequency and adjusts, to guarantee the optimal design of signal integrity and EMC.
In embodiments of the present invention, the resistance span of described first resistance can can be 0 to 100 pico farad for the electric capacity span of 0 to 100 pico farad, described second electric capacity for 0 to 100 ohm, the electric capacity span of described first electric capacity.
The difference of the present embodiment and first embodiment is: under complicated radiation event, FPC radiation-screening noise by shielding between described printed circuit board (PCB) and the described LCDs, the overlap joint of interface is designed to multipoint earthing, is connected on the LCDs interface of described printed circuit board (PCB).
Under complicated radiation event, can adopt the gentle band of the FPC line of shielding between PCB circuit board and the LCD screen, for the processing of FPC line, adopt shielding line radiation-screening noise, the overlap joint of interface is designed to multipoint earthing, is connected on the LCD interface of pcb board.
The part of clock line on the PCB circuit board among the LCD interface cable FPC should be done bag ground and handle; PCB is provided with a plurality of earth points near the LCD interface, can guarantee the multipoint earthing of screen layer when RE radiation event complexity needs the gentle band of FPC line to adopt shielding line.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a terminal comprises printed circuit board (PCB), LCDs chip for driving and LCDs, it is characterized in that, also comprises source end capacitance-resistance match circuit and does not hold filtering circuit;
Described source end capacitance-resistance match circuit, be used for the reflecting background signal is suppressed, limit the common mode current of described LCDs chip for driving output noise, and the switching noise that conduction produces in the contactor process of the described LCDs chip for driving of filtering inside;
The described filtering circuit of not holding is used to suppress the noise that the LCDs winding displacement is introduced, and isolates the interference that described LCDs chip for driving side produces.
2. terminal according to claim 1 is characterized in that:
Described source end capacitance-resistance match circuit is arranged on described LCDs chip for driving end, near the output pin of described LCDs chip for driving.
3. terminal according to claim 2 is characterized in that:
Described source end capacitance-resistance match circuit comprises first resistance and first electric capacity;
One end of described first resistance is connected with the output pin of described LCDs chip for driving, and the other end and described first electric capacity and the transmission line that is connected described LCDs chip for driving and described LCDs are connected.
4. terminal according to claim 1 is characterized in that:
The described filtering circuit of not holding is arranged on described LCDs end, near the interface of described LCDs.
5. terminal according to claim 4 is characterized in that:
The described filtering circuit of not holding comprises the magnetic bead and second electric capacity;
One end of described magnetic bead is connected with the interface of described LCDs and described second electric capacity, and the other end is connected with the transmission line that is connected described LCDs chip for driving and described LCDs.
6. terminal according to claim 4 is characterized in that:
Described second resistance and the 3rd electric capacity of not holding filtering circuit to comprise low resistance;
One end of described second resistance is connected with the interface of described LCDs and described the 3rd electric capacity, and the other end is connected with the transmission line that is connected described LCDs chip for driving and described LCDs.
7. according to each described terminal of claim 1 to 6, it is characterized in that:
By the FPC radiation-screening noise of shielding, the overlap joint of interface is designed to multipoint earthing, is connected on the LCDs interface of described printed circuit board (PCB) between described printed circuit board (PCB) and the described LCDs.
8. according to each described terminal of claim 3 to 6, it is characterized in that:
The resistance span of described first resistance is: 0 to 100 ohm;
The electric capacity span of described first electric capacity is: 0 to 100 pico farad.
9. according to claim 5 or 6 described terminals, it is characterized in that:
The electric capacity span of described second electric capacity is: 0 to 100 pico farad;
The electric capacity span of described the 3rd electric capacity is: 0 to 100 pico farad.
10. terminal according to claim 6 is characterized in that:
The resistance value of described second resistance is 0 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102393438A CN101482659B (en) | 2008-12-10 | 2008-12-10 | Terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102393438A CN101482659B (en) | 2008-12-10 | 2008-12-10 | Terminal |
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| Publication Number | Publication Date |
|---|---|
| CN101482659A true CN101482659A (en) | 2009-07-15 |
| CN101482659B CN101482659B (en) | 2010-09-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008102393438A Active CN101482659B (en) | 2008-12-10 | 2008-12-10 | Terminal |
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| CN (1) | CN101482659B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607874A (en) * | 2013-10-30 | 2014-02-26 | 优能通信科技（杭州）有限公司 | Electromagnetic-interference-resistant terminal |
| CN105206487A (en) * | 2015-10-08 | 2015-12-30 | 清华大学 | Liquid metal plasma color display device and preparation method thereof |
| CN107809506A (en) * | 2017-11-23 | 2018-03-16 | 广东欧珀移动通信有限公司 | Anti-jamming circuit structure and mobile terminal |
| CN107959737A (en) * | 2017-11-23 | 2018-04-24 | 广东欧珀移动通信有限公司 | Anti-jamming circuit structure and mobile terminal |
-
2008
- 2008-12-10 CN CN2008102393438A patent/CN101482659B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607874A (en) * | 2013-10-30 | 2014-02-26 | 优能通信科技（杭州）有限公司 | Electromagnetic-interference-resistant terminal |
| CN105206487A (en) * | 2015-10-08 | 2015-12-30 | 清华大学 | Liquid metal plasma color display device and preparation method thereof |
| CN105206487B (en) * | 2015-10-08 | 2017-12-19 | 清华大学 | A kind of liquid metal plasma color display device and preparation method |
| CN107809506A (en) * | 2017-11-23 | 2018-03-16 | 广东欧珀移动通信有限公司 | Anti-jamming circuit structure and mobile terminal |
| CN107959737A (en) * | 2017-11-23 | 2018-04-24 | 广东欧珀移动通信有限公司 | Anti-jamming circuit structure and mobile terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101482659B (en) | 2010-09-08 |
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Effective date of registration: 20171102 Address after: Metro Songshan Lake high tech Industrial Development Zone, Guangdong Province, Dongguan City Road 523808 No. 2 South Factory (1) project B2 -5 production workshop Patentee after: HUAWEI terminal (Dongguan) Co., Ltd. Address before: 518129 HUAWEI Technology Co., Ltd. Bantian HUAWEI base, Longgang District, Shenzhen, Guangdong Patentee before: Huawei Device Co., Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 523808 Southern Factory Building (Phase I) Project B2 Production Plant-5, New Town Avenue, Songshan Lake High-tech Industrial Development Zone, Dongguan City, Guangdong Province Patentee after: Huawei Device Co., Ltd. Address before: 523808 Southern Factory Building (Phase I) Project B2 Production Plant-5, New Town Avenue, Songshan Lake High-tech Industrial Development Zone, Dongguan City, Guangdong Province Patentee before: HUAWEI terminal (Dongguan) Co., Ltd. |