CN101964159B - Display module for mobile communication device - Google Patents
Display module for mobile communication device Download PDFInfo
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- CN101964159B CN101964159B CN200910157634A CN200910157634A CN101964159B CN 101964159 B CN101964159 B CN 101964159B CN 200910157634 A CN200910157634 A CN 200910157634A CN 200910157634 A CN200910157634 A CN 200910157634A CN 101964159 B CN101964159 B CN 101964159B
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- printed wiring
- wiring board
- flexible printed
- mobile communication
- display module
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Abstract
The invention discloses a display module for a mobile communication device. The display module comprises a display panel, a flexible printed circuit board (PCB) and an electronic element, wherein the flexible PCB is coupled to the display panel and is divided into a first part and a second part; the electronic element is opposite to the second part of the flexible PCB and is arranged on the flexible PCB; and the ductility of the second part of the flexible PCB is lower than that of the first part of the flexible PCB. The display module for the mobile communication device of the embodiment of the invention can reduce resonance effect and noise.
Description
Technical field
The invention relates to one and be used for the display module that handheld apparatus is used, especially about reducing the display module that is used for device for mobile communication of noise.
Background technology
Fig. 1 shows the exploded view of a known device for mobile communication with display.Be set in the space that a lower casing 11 and a upper casing 12 defined with display 10, one display modules according to known device for mobile communication.Display module comprises a display panel 13, a driver 15 and a flexible printed wiring board 14.Display panel 13 must drive through external drive voltage, therefore can be provided with a driver 15 in display panel 13, and make a flexible printed wiring board 14 be coupled to display panel 13, in order to drive display panel 13.Flexible printed wiring board 14 is provided with a plurality of electronic components, for example can be resistance, electric capacity etc.Upper casing 12 is provided with a loudspeaker (speaker) 17, listens the other side's sound to supply the user when the communication.When device for mobile communication carried out communication, because user's ear can be in the extreme near loudspeaker 17, the noise that is therefore produced with display 10 for device for mobile communication can be considerably responsive.Generally speaking, the manufacturer of the device for mobile communication noise that can require device for mobile communication to be produced with display 10 must reach a noise-measuring standard (noise measurement specification).
Fig. 2 A and 2B show that device for mobile communication produces an example of noise with display.Device for mobile communication with display in when operation; Be through changing the optical characteristics that a driving voltage changes liquid crystal in the display panel 13; But in the process that driving voltage changes; The voltage difference that constantly changes can influence the dielectric composition of the electric capacity 16 on the flexible printed wiring board 14, makes electric capacity 16 expand or contraction, and then causes the deformation of flexible printed wiring board 14 superficial expansions or contraction.When electric field that voltage difference caused changes in time, flexible printed wiring board 14 can shake along with the contraction of electric capacity 16 and expansion, shown in Fig. 2 B.The frequency that produces resonance when these vibrations drops on the audiorange that people's ear can be experienced, and promptly forms noise.
Known technology mainly utilizes the capacitance characteristic that changes electric capacity 16, reduces electric capacity 16 and influenced by driving voltage and the degree of being out of shape, and then reach the effect of the noise that reduces resonance.Yet under the strict day by day situation of the display quality that requires display module and the degree that can stand noise, the effect that can reach the reduction noise through the capacitance characteristic that changes electric capacity 16 can't satisfy practical application.Fig. 3 A and 3B show that device for mobile communication produces an example of noise with display.Please with reference to Fig. 3 A and 3B, the upper and lower surfaces at flexible printed wiring board 14 in a known technology is provided with electric capacity 16 symmetrically, to slow down the degree of flexible printed wiring board 14 vibrations, reduces the formation noise.Yet; In the time of will electric capacity 16 being provided with the upper and lower surfaces of flexible printed wiring board 14 symmetrically, comparatively difficult in the manufacturing, formed flexible printed wiring board 14 its thickness are also thicker; Therefore be not easy to be installed in lower casing 11 and the upper casing 12, and then on making, increased the complexity of handling.
Summary of the invention
One embodiment of the invention provides a kind of device for mobile communication to use display module, and it comprises a display panel, a flexible printed wiring board and at least one electronic component.Flexible printed wiring board is coupled to display panel, is made up of one first flexible printed wiring board part and one second flexible printed wiring board part.The position of electronic component is corresponding to second flexible printed wiring board of flexible printed wiring board part and be arranged at the first surface of flexible printed wiring board.Said electronic component partially overlaps the said second flexible printed wiring board part of said flexible printed wiring board at least along the zone of the orthogonal projection of normal on said first surface of said first surface; Wherein, the ductility of second flexible printed wiring board of flexible printed wiring board part is less than the ductility of first flexible printed wiring board part of flexible printed wiring board.
One embodiment of the invention provides a kind of device for mobile communication to use display module, and it comprises a display panel, a flexible printed wiring board and at least one electronic component.Flexible printed wiring board is coupled to display panel, is made up of one first flexible printed wiring board part and one second flexible printed wiring board part.The position of electronic component is corresponding to second flexible printed wiring board of flexible printed wiring board part and be arranged at the first surface of flexible printed wiring board.Said electronic component is positioned at said second flexible printed wiring board part of said flexible printed wiring board along the zone of the orthogonal projection of normal on said first surface of said first surface; Wherein, the ductility of second flexible printed wiring board of flexible printed wiring board part is less than the ductility of first flexible printed wiring board part of flexible printed wiring board.
One embodiment of the invention provide a kind of device for mobile communication to use display module, and it comprises a display panel, a flexible printed wiring board, at least one electronic component and an antiresonance layer.Flexible printed wiring board is coupled to display panel, and has a first surface and a second surface with respect to first surface.Electronic component is arranged at the first surface of flexible printed wiring board.The antiresonance layer is arranged at the second surface of flexible printed wiring board, and the corresponding electronic component in the position of antiresonance layer, with the cubic deformation of mitigation electronic component, and then reduces the resonance effect that flexible printed wiring board produced.
One embodiment of the invention antiresonance layer is located at the second surface of flexible printed wiring board; Electronic component is arranged at the first surface of flexible printed wiring board; And be to correspond to electronic component through the position that is provided with of antiresonance layer; Make the antiresonance layer can relax the acting force that distortion produced of flexible printed wiring board, and then make display module can slow down flexible printed wiring board to carry out resonance, reach the effect that reduces noise because of electronic component.
Description of drawings
Fig. 1 shows the exploded view of a known device for mobile communication with display;
Fig. 2 A and 2B show that device for mobile communication produces an example of noise with display;
Fig. 3 A and 3B show that device for mobile communication produces an example of noise with display;
Fig. 4 A shows the vertical view of the device for mobile communication of one embodiment of the invention with display module;
Fig. 4 B shows the side view of the device for mobile communication of one embodiment of the invention with display module;
Fig. 5 A and 5B show the vertical view of the device for mobile communication of one embodiment of the invention with display module respectively;
Fig. 5 C shows the different noise-measurings position of the device for mobile communication of one embodiment of the invention with display module;
Fig. 6 A shows the vertical view of the device for mobile communication of one embodiment of the invention with display module;
Fig. 6 B shows the side view of the device for mobile communication of one embodiment of the invention with display module;
Fig. 7 A shows the vertical view of the device for mobile communication of another embodiment of the present invention with display module;
Fig. 7 B shows the side view of the device for mobile communication of another embodiment of the present invention with display module;
Fig. 8 shows the side view of the device for mobile communication of another embodiment of the present invention with display module.
Drawing reference numeral
10 device for mobile communication are used display
11 lower casings
12 upper casings
13 display panels
14 flexible printed wiring boards
15 drivers
16 electric capacity
17 loudspeakers
41 second surfaces
42 first surfaces
43 couplings
44 invayinations
100 device for mobile communication are used display module
The 100a device for mobile communication is used display module
113 display panels
114 flexible printed wiring boards
115 drivers
116 electronic components
124 antiresonance layers
134 add layer
141 firsts
142 second portions
Embodiment
Fig. 4 A shows the vertical view of the device for mobile communication of one embodiment of the invention with display module.Fig. 4 B shows the side view of the device for mobile communication of one embodiment of the invention with display module.According to one embodiment of the invention, device for mobile communication comprises a display panel 113, a flexible printed wiring board 114, an electronic component 116 and at least one antiresonance layer 124 with display module 100.In present embodiment, can also comprise a driver 115.
In present embodiment, antiresonance layer 124 is located at the second surface 41 of flexible printed wiring board 114.Electronic component 116 is arranged at the first surface 42 of flexible printed wiring board 114, when electronic component 116 produces distortion, can produce the acting force that is parallel to first surface 42 to the first surface 42 of flexible printed wiring board 114.The device for mobile communication of present embodiment through the corresponding electronic component 116 in position that antiresonance layer 124 is provided with, makes antiresonance layer 124 can help the acting force that distortion produced of flexible printed wiring board 114 opposings because of electronic component 116 with display module 100.Therefore, device for mobile communication can slow down flexible printed wiring board 114 with display module 100 and carry out resonance, and then reaches the effect that reduces noise.
Below to different experiment purposes, design that different experiment conditions is listed in the table below one, table three and table five, and each embodiment and Comparative Examples are measured, measurement result is recorded in like following table two, table four and table six.Experiment condition for example has: laboratory sample also is display module or display (Liquid Crystal Display Module; LCM); The kind of antiresonance layer, position and shared zone; Measure background condition; And noise mainly concentrates on electronic component 116 positions etc.In below table, double sticky tape is to use ultra viscosity double faced adhesive tape (DEER BRAND), electrostatic prevention adhesive tape to be to use Japan's electrical equipment adhesive tape (TOYO) and 3M adhesive tape to be to use Scotch Super Clear (3M) adhesive tape.
Table one (condition of experiment purpose 1)
Table two (measurement result of experiment purpose 1)
Table three (condition of experiment purpose 2)
Table four (measurement result of experiment purpose 2)
Table five (condition of experiment purpose 3)
Table six (measurement result of experiment purpose 3)
Fig. 5 A and 5B show the vertical view of the device for mobile communication of one embodiment of the invention with display module respectively.Please with reference to Fig. 5 A; In above-mentioned each table about the term of " part "; Be the part that only is arranged at the couplings 43 of flexible printed wiring board 14 in order to expression antiresonance layer 124, and electronic component 116 be positioned at antiresonance layer 124 along the normal of first surface 42 in the region S of the orthogonal projection of first surface 42., in above-mentioned each table,, be the most areas that only are arranged at the couplings 43 of flexible printed wiring board 14 in order to expression antiresonance layer 124 please about " whole face " term with reference to Fig. 5 B.The display module of the device for mobile communication of Fig. 5 C demonstration one embodiment of the invention is for different measuring position that noise carries out.Please reference table two, table four and table six in the lump, wherein, each is measured in the numerical value, and expression is through (pass) below the 5db; 5db-10db representes in the permissible range through (margin pass).
According to the noise-measuring standard, when measurement noise, must carry out meeting under the background noise of following situation: also the wideband noise level of background noise (broad band noise level) surpasses 10dB (A) ref 20 μ Pa when frequency 20 is between 20kHz; Surpass 5dB (A) ref 20 μ Pa when perhaps frequency is greater than 1kHz; Perhaps there is not spike (peak).Employed measurement mechanism must meet the regulation of IEC (International Electro technical Commission) 651, and can between frequency range (frequency span) 20Hz to 16kHz, have the frequency resolution degree of 5Hz (frequency resolution) at least.Measurement mechanism also must be able to be measured little monotone acoustic pressure to 5dB ref20 μ Pa (single tone sound pressure).In practical application, measurement mechanism can use a microphone and a computer, and microphone distance device for mobile communication to be measured is used for detecting noise content and passes data measured back computer with directly over the display module 5 millimeters.This computer be provided with one be suitable for carrying out spectrum analysis (FFT-analysator) the measurement card.And this measurement mechanism should and be measured the back before measuring and carry out suitable correction (calibration) according to IEC942.
Please with reference to table one and table two, experiment purpose 1 is for the difference that obtains the antiresonance layer measurement result under the condition to be set.
According to Comparative Examples 1, embodiment 1 and embodiment 2, can know that the effect that reduces noise when antiresonance layer 124 and electronic component 116 all are located at first surface 42 is relatively poor; And that antiresonance layer 124 reduces the effect of noise when being located at second surface 41 and electronic component 116 and all being located at first surface 42 is preferable.
According to Comparative Examples 1, embodiment 1 and embodiment 5, can know that antiresonance layer 124 is arranged at the part of the couplings 43 of flexible printed wiring board 14; Perhaps haply whole of couplings 43 all has the effect that reduces noise.According to Comparative Examples 1, embodiment 1 and embodiment 5; Comparative Examples 2 and embodiment 6; And Comparative Examples 3 and embodiment 7, use different samples (display module) even can know; Perhaps use different types of antiresonance layer 124, can know that antiresonance layer 124 shared zone perhaps are whole for local, all have the effect that reduces noise.
According to Comparative Examples 1, embodiment 2, embodiment 3 and embodiment 4, can know and use different types of adhesive tape all to have the effect that reduces noise as antiresonance layer 124.Those adhesive tapes can use, for example transparent low temperature resistant OPP adhesive tape (DEER BRAND), ultra viscosity double faced adhesive tape (DEER BRAND), Japan's electrical equipment adhesive tape (TOYO), crepe paper tape (GLOBE TAPE) and 3M Scotch Super Clear adhesive tape (3M) etc.
In addition, embodiment 2-7 is under the situation of preferable condition at measuring condition, all has the effect that reduces noise content 3db to 5db.
Please with reference to table three and table four; The contraction of preferable display frame and relatively poor its electric capacity of display frame is different with the degree of expansion, and experiment purpose 2 is to use different types of adhesive tape measurement result under different display frames (preferable/relatively poor) measuring condition respectively in order to obtain.
According to Comparative Examples 4-7 and embodiment 8-11, can know that at measuring condition be under the situation of preferable conditioned disjunction poor condition, all have the effect that reduces noise, and be under the situation of poor condition in measuring condition, have the effect that reduces noise content 6db to 18db.
Please with reference to table five and table six; Experiment purpose 3 is the measurement results that mainly produced by electronic component 116 when noise source in order to obtain; According to Comparative Examples 8 and embodiment 12, and Comparative Examples 9 and embodiment 13, the display that is provided with antiresonance layer 124 has the effect that reduces noise.
Table seven
Table seven is the experimentize result of gained of 6131,791,761 and 210 adhesive tape for the article number that uses the DEER BRAND of manufacturer manufacturing.Can learn that by last table seven effect that reduces noise when tension intensity during less than 10N/cm is preferable.The effect that reduces noise when tension intensity during between 10N/cm to 24N/cm is general.Therefore, can learn and use when having the adhesive tape of less ductility that display module can have the effect that reduces noise.
Fig. 6 A shows the vertical view of the device for mobile communication of another embodiment of the present invention with display module.Fig. 6 B shows the side view of the device for mobile communication of another embodiment of the present invention with display module.Device for mobile communication with display module 100a similar in appearance to device for mobile communication with display module 100, components identical uses identical symbol also to omit its related description.Display module 100a can not be provided with antiresonance layer 124 in the present embodiment.By convenient explanation makes flexible printed wiring board 114 be made up of a first 141 and a second portion 142.Second portion 142 is meant the part of flexible printed wiring board 114 corresponding electronic components 116 present positions, and first 141 is meant second portion 142 part in addition of flexible printed wiring board 114.
Please with reference to Fig. 6 A and 6B, the second portion 142 of the corresponding flexible printed wiring board 114 in position that electronic component 116 is provided with and be located at the first surface 42 of flexible printed wiring board 114.More specifically, electronic component 116 partially overlaps the second portion 142 of flexible printed wiring board 114 at least along the regional A of the orthogonal projection of a normal on first surface 42 of first surface 42.In present embodiment, electronic component 116 more is positioned at the second portion 142 of flexible printed wiring board 114 along the regional A of the orthogonal projection of a normal on first surface 42 of first surface 42.Wherein, Make the ductility of the second portion 142 of flexible printed wiring board 114; Less than the ductility of the first 141 of flexible printed wiring board 114, with so that display module 100a can slow down the resonance effect of flexible printed wiring board 114, and then reach the effect that reduces noise.
Fig. 7 A shows the vertical view of the device for mobile communication of another embodiment of the present invention with display module.Fig. 7 B shows the side view of the device for mobile communication of another embodiment of the present invention with display module.Device for mobile communication with display module 100b similar in appearance to device for mobile communication with display module 100, components identical uses identical symbol also to omit its related description.In an embodiment, device for mobile communication comprises also that with the flexible printed wiring board 114 of display module 100b another adds layer 134.Be provided with a manufacture of the flexible printed wiring board 114 that adds layer 134, can in the manufacturing course of flexible printed wiring board 114, form one again in electronic component 116 set pre-positions of first surface 42 and add layer 134.And the part that is formed with the flexible printed wiring board 114 that adds layer 134 constitutes second portion 142.In present embodiment, add layer 134 because second portion 142 includes, and the ductility of second portion 142 that can make flexible printed wiring board 114 is less than the first 141 of flexible printed wiring board 114.The material of adding layer 134 can be used the material of the first 141 that is same as flexible printed wiring board 114, also promptly is same as the material of the flexible printed wiring board 114 of Fig. 4 B.In a preferred embodiment, add the material of layer 134 and can use the material of ductility less than the first 141 of flexible printed wiring board 114.Add layer 134 and be located at electronic component 116 and 42 of first surfaces, and make and add the corresponding electronic component 116 in layer 134 position, carry out resonance in order to minimizing flexible printed wiring board 114.Moreover in a preferred embodiment; Add layer 134 set position and correspond to antiresonance layer 124; In present embodiment; Electronic component 116 is located in the surf zone that adds layer 134, make add layer 134 and electronic component 116 all be positioned at antiresonance layer 124 along the normal of first surface 42 in the region S of the orthogonal projection of first surface 42.
Fig. 8 shows the side view of the device for mobile communication of another embodiment of the present invention with display module.Device for mobile communication is used display module 100b with display module 100c similar in appearance to device for mobile communication, and components identical is used identical symbol and omitted its related description.Device for mobile communication also comprises a clad 144 with display module 100c, and clad 144 coated electric components 116 are in order to the distortion of the volume that reduces electronic component 116.In the present embodiment,, make display module 100c can slow down flexible printed wiring board 114 and carry out resonance and then reach the effect that reduces noise owing to reduced the distortion of the volume of electronic component 116.
Device for mobile communication in when operation, is through changing the optical characteristics that a driving voltage changes liquid crystal in the display panel with display module 100,100a, 100b and 100c, yet; In the process that driving voltage changes; Can influence the dielectric composition of the electric capacity on the flexible printed wiring board, make electric capacity 16 expand or contraction, and then cause the deformation vibrations of flexible printed wiring board superficial expansion or contraction; Produce resonance effect, form noise for people's ear.The present invention is for improving this problem, through relevant careful experimental analysis, is found on the flexible printed wiring board through the set position of antiresonance layer corresponding to electronic component; Make the antiresonance layer can relax the acting force that distortion produced of flexible printed wiring board because of electronic component 116; Thereby reduced resonance effect, and reach the effect that reduces noise, reached the effect that can not expect; Therefore the present invention has outstanding technical characterictic and significant effect, may be to assert.And antiresonance layer used in the present invention can be an adhesive tape and implements, and also different prior aries change the thinking on the original design for the means of head it off, has more simplified the complexity of making.
Claims (9)
1. a device for mobile communication is used display module, it is characterized in that, said device for mobile communication comprises with display module:
One display panel;
One flexible printed wiring board is coupled to said display panel, is made up of one first flexible printed wiring board part and one second flexible printed wiring board part; And
One electronic component; Its position is corresponding to the said second flexible printed wiring board part of said flexible printed wiring board; And be arranged at the first surface of said flexible printed wiring board, said electronic component partially overlaps the said second flexible printed wiring board part of said flexible printed wiring board at least along the zone of the orthogonal projection of normal on said first surface of said first surface;
Wherein, the ductility of said second flexible printed wiring board part of said flexible printed wiring board is less than the ductility of said first flexible printed wiring board part of said flexible printed wiring board.
2. device for mobile communication as claimed in claim 1 is used display module, it is characterized in that, said electronic component is positioned at the said second portion of said flexible printed wiring board along the zone of the orthogonal projection of normal on said first surface of said first surface.
3. according to claim 1 or claim 2 device for mobile communication is used display module, it is characterized in that, said second flexible printed wiring board part of said flexible printed wiring board comprises that also one adds layer.
4. device for mobile communication as claimed in claim 3 is used display module, it is characterized in that, said material of adding layer is same as the said first flexible printed wiring board part of said flexible printed wiring board.
5. device for mobile communication as claimed in claim 3 is used display module, it is characterized in that, the ductility of the material of said interpolation layer is less than the ductility of said first flexible printed wiring board part of said flexible printed wiring board.
6. device for mobile communication as claimed in claim 3 is used display module, also comprises a clad, in order to coating said electronic component, in order to the distortion of the volume that reduces said electronic component, and then reduces the resonance effect of said flexible printed wiring board.
7. according to claim 1 or claim 2 device for mobile communication is used display module, it is characterized in that, said device for mobile communication comprises also that with display module an antiresonance layer is arranged at the second surface of said second flexible printed wiring board part.
8. device for mobile communication as claimed in claim 7 is used display module, it is characterized in that, said electronic component is positioned at the zone of said antiresonance layer along the orthogonal projection of normal on said first surface of said first surface.
9. device for mobile communication as claimed in claim 7 is used display module, it is characterized in that, said antiresonance layer is an adhesive tape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910157634A CN101964159B (en) | 2009-07-21 | 2009-07-21 | Display module for mobile communication device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910157634A CN101964159B (en) | 2009-07-21 | 2009-07-21 | Display module for mobile communication device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101964159A CN101964159A (en) | 2011-02-02 |
| CN101964159B true CN101964159B (en) | 2012-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910157634A Active CN101964159B (en) | 2009-07-21 | 2009-07-21 | Display module for mobile communication device |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111179873B (en) * | 2020-02-19 | 2022-12-06 | 京东方科技集团股份有限公司 | Shutdown noise reduction circuit, shutdown noise reduction chip and display device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1402319A (en) * | 2001-07-30 | 2003-03-12 | 富士通日立等离子显示器股份有限公司 | IC chip installing structure and display apparatus |
| CN1612679A (en) * | 2003-10-29 | 2005-05-04 | 三星Sdi株式会社 | Display device and heat dissipating means therefor |
| CN2768338Y (en) * | 2005-02-01 | 2006-03-29 | 上海环达计算机科技有限公司 | Structure capable of making intelligent mobile phone to reduce thickness |
-
2009
- 2009-07-21 CN CN200910157634A patent/CN101964159B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1402319A (en) * | 2001-07-30 | 2003-03-12 | 富士通日立等离子显示器股份有限公司 | IC chip installing structure and display apparatus |
| CN1612679A (en) * | 2003-10-29 | 2005-05-04 | 三星Sdi株式会社 | Display device and heat dissipating means therefor |
| CN2768338Y (en) * | 2005-02-01 | 2006-03-29 | 上海环达计算机科技有限公司 | Structure capable of making intelligent mobile phone to reduce thickness |
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| CN101964159A (en) | 2011-02-02 |
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