CN1908743A

CN1908743A - Liquid crystal displaying device

Info

Publication number: CN1908743A
Application number: CN 200610108167
Authority: CN
Inventors: 方春生; 张哲志; 庄信源; 赖瑞琳
Original assignee: AU Optronics Corp
Current assignee: AU Optronics Corp
Priority date: 2006-07-31
Filing date: 2006-07-31
Publication date: 2007-02-07
Anticipated expiration: 2026-07-31
Also published as: CN100552502C

Abstract

The related LCD comprises: a liquid crystal panel with multiple IC on one side, and a back light module under the panel and included a guide plate and a soft circuit board with conductive layer, wherein the guide plate includes an emergent plane and incidence plate, the soft circuit board includes the first part with at least one LED near the incidence plane and the second part covered the panel side to drive IC. This invention can prevent EMI from both inside and outside.

Description

LCD

Technical field

The present invention is about a kind of LCD, particularly a kind of LCD of preventing making Electromagnetic Interference.

Background technology

Existing electronic apparatus capable of displaying image all utilizes a LCD to come images such as display graphics, symbol and literal mostly.Particularly at the hand-held electronic apparatus capable of displaying image, because it has lightly, make things convenient for and advantage such as portable, be widely used in various fields at present, comprised the mobile phone of communication field, the PDA of document writing function and the electronic dictionary of data check function etc.

In these electronic installations, be to utilize specific shows signal and make the liquid crystal display displays image, yet, in the process that whole shows signal is transmitted, in case be subjected to inner other assembly of this electronic installation or the extraneous electromagnetic influence of interference that is given out, this shows signal will produce noise and make the shown image distortion of LCD.

In these LCD, most likely utilize flexible PCB to transmit this shows signal.In order to reduce the electromagnetic influence that is interfered of this shows signal in transmittance process, general conventional art can adopt dual mode to add in case make usually.One, disclosed as No. 6948371 patent of U.S.'s bulletin on September 27th, 2005, it is to give ground connection in order to the signal wire both sides of transmitting this shows signal, the interference that anti-system electromagnetic wave causes shows signal so as to disturbing electromagnetic wave to derive.They are two years old, then as the disclosed person of No. 20040114062 patent case (being designated hereinafter simply as this case) of bulletin in the U.S. on June 17th, 2004, it is the shielding action that utilizes metallic cover, and will disturb electromagnetic wave to be denial in outside the signal transfering circuit, disturbs the interference of electromagnetic wave to shows signal so as to anti-system.

Edge this, according to the spirit of the disclosed technology contents of this case, enumerate the structure of a conventional liquid crystal and do further explanation.See also Fig. 1, it shows the structural drawing sectional view of a conventional liquid crystal.As shown in the figure, a LCD 100 includes a liquid crystal panel 1, several drive IC 2 (Fig. 1 only shows one of them), a backlight module 3.This liquid crystal panel 1 includes a top glass substrate 11 and a lower glass substrate 12, and this backlight module 3 includes an optical thin film 31, a light guide plate 32, a flexible PCB 33 and several LED34 (Fig. 1 only shows one of them).

Wherein, this top glass substrate 11, this lower glass substrate 12, this optical thin film 31 and this light guide plate 32 are be superimposed together in regular turn (be equipped with liquid crystal between this top glass substrate 11 and this lower glass substrate 12, be not shown in this figure).This light guide plate 32 possesses an incidence surface 321 and an exiting surface 322.This drive IC 2 is installed on this lower glass substrate 12, and is positioned at a lateral location of contiguous this top glass substrate 11.

This LED34 then is disposed on this flexible PCB 32, and corresponding to the incidence surface 321 of this light guide plate 32.When this drive IC 2 is sent a shows signal, can drive this liquid crystal panel 1 according to this shows signal show image.Simultaneously, one predetermined power can be supplied to this LED34 via this flexible PCB 33, make it send a throw light, this throw light can enter light guide plate 32 by this incidence surface 321, through behind the leaded light of this light guide plate 32, can penetrate and throw by this exiting surface 322 to this liquid crystal panel 1, to provide this liquid crystal panel 1 show image required backlight.

In addition, for these LCD 100 inner other assemblies of anti-system and the extraneous interference electromagnetic wave of being dispersed to causing the electromagnetic interference (EMI) phenomenon at the signal of these LCD 100 internal delivery (particularly this drive IC 2 sent shows signal), in the disclosed technology of this case, more the opposite side at this backlight module 3 installs a sheet metal 4 additional, and utilize this sheet metal 4 is overlapped in the mode of the metal shell (not being shown in this figure) of this LCD 100 or system earth point and gives ground connection, or be directly to encapsulate this LCD, alleviate so as to utilizing the distinctive shielding effect of metal and disturb the negative effect that electromagnetic wave caused with a metal shell.

Owing in this conventional art, must additionally coat this sheet metal 4, even also must use metal shell to encapsulate this LCD, so no matter on assembling man-hour and material, all must pay bigger cost.

Summary of the invention

Technical matters and purpose that institute of the present invention desire solves:

Take a broad view of the above, because conventional art ubiquity cost of manufacture, time cost and material cost height, and problem such as the electromagnetic interference (EMI) effect of control is limited.Fundamental purpose of the present invention provides a kind of anti-system technology of electromagnetic interference (EMI) that is applied to LCD, this technology is a plurality of drive IC outside in a LCD, with a flexible PCB and give to cover, this flexible circuit intralamellar part, dispose a conductive layer, so as to transmitting the luminous required electric power of this LED, and shield this drive IC simultaneously.

Of the present invention time a purpose provides a kind of anti-system technology of electromagnetic interference (EMI) that applies to the mobile phone LCD, this technology mainly provides a flexible PCB that possesses conductive layer, so as to preventing under the situation of system assembly in conjunction with other electromagnetic interference (EMI) in addition, can effectively prevent and treat the Electromagnetic Interference that the external electromagnetic ripple causes the LCD of this mobile phone, so as to assembly cost and the material cost that reduces this mobile phone.

The technological means that the present invention deals with problems:

The present invention provides a kind of LCD for the technological means that problem adopted that solves conventional art.This LCD includes a liquid crystal panel and a backlight module, and dispose a plurality of drive IC, this liquid crystal panel include a top glass substrate and be superimposed with it under glass substrate, be equipped with liquid crystal between the two, this backlight module is disposed at glass substrate below under this liquid crystal panel, and includes the flexible PCB that a light guide plate and is linked to this light guide plate.This light guide plate has an exiting surface and an incidence surface, this flexible PCB includes a conductive layer and a circuit layer, and possesses the second portion that a first and is linked to this first, this first is provided with at least one LED that is adjacent to this incidence surface, and this second portion then is to be covered in the side of this liquid crystal panel to hide this drive IC.

The present invention contrasts the effect of prior art:

Compared to the anti-system technology of the electromagnetic interference (EMI) of existing electronic installation, in LCD provided by the present invention, utilized a kind of technology especially at flexible PCB configuration conductive layer, but it not only possesses transmitting electric power and the effectively anti-effect of making Electromagnetic Interference, more can effectively reduce manufacture craft cost, time cost and the material cost of this LCD.

Description of drawings

Specific embodiment of the present invention will be further described by following embodiment and the attached accompanying drawing that is.

Fig. 1 is the structural drawing sectional view that shows a conventional liquid crystal;

Fig. 2 is the sectional perspective outward appearance exploded view that shows first embodiment of the invention;

Fig. 3 is the partial cutaway schematic of 3-3 section in the displayed map 2;

Fig. 4 is the partial cutaway schematic of 4-4 section in the displayed map 2;

Fig. 5 is the sectional perspective outward appearance exploded view that shows first embodiment of the invention;

Fig. 6 is the partial perspective view behind the assembling glue frame in the displayed map 5;

Fig. 7 is the partial cutaway schematic of the 7-7 section among Fig. 5;

Fig. 8 is the sectional perspective outward appearance exploded view that shows second embodiment of the invention;

Fig. 9 is the stereo appearance figure that shows second embodiment of the invention; And

Figure 10 is the stereo appearance figure that shows third embodiment of the invention.

The primary clustering symbol description

100 LCD

1 liquid crystal panel

11 top glass substrate

12 lower glass substrate

2 drive IC

3 backlight modules

31 optical thin films

32 light guide plate

321 incidence surfaces

322 exiting surfaces

33 flexible PCBs

34 LED

4 sheet metals

200 LCD

5 liquid crystal panels

51 top glass substrate

52 lower glass substrate

6 drive IC

7 backlight modules

71 optical modules

711,712 optical thin films

72 light guide plate

721 incidence surfaces

722 exiting surfaces

73 flexible PCBs

731 firsts

732 second portions

733 circuit layers

734 inner insulating layers

735 conductive layers

736 external insulation layers

74 LED

8 glue frames

300 mobile phones

9 bodies

91 upper shells

911 engagement grooves

92 lower houses

93 accommodation spaces

400 digital cameras

The 9a body

The 91a upper shell

The 911a engagement groove

The 92a lower house

Embodiment

See also Fig. 2 to Fig. 4, Fig. 2 is the sectional perspective outward appearance exploded view that shows first embodiment of the invention, and Fig. 3 is the partial cutaway schematic of 3-3 section in the displayed map 2, and Fig. 4 is the partial cutaway schematic of 4-4 section in the displayed map 2.As shown in the figure, a LCD 200 includes a liquid crystal panel 5, several drive IC 6, a backlight module 7 and a glue frame 8.This liquid crystal panel 5 includes a top glass substrate 51 and a lower glass substrate that is superimposed with it 52, is equipped with liquid crystal (not being shown in this figure) between the two.This backlight module 7 includes an optical module 71, a light guide plate 72, a flexible PCB 73 and several LED74.

Wherein, this optical module 71 is incorporated between this liquid crystal panel 5 and this light guide plate 72, and comprises possessing that two optical thin films 711 and 712 (being shown in Fig. 3) are arranged.This drive IC 6 is disposed at the lateral surface of glass substrate 52 under this liquid crystal panel 5, and be positioned at a lateral location of the top glass substrate 51 of this liquid crystal panel 5, this light guide plate 72 has an incidence surface 721 and an exiting surface 722, wherein, this exiting surface 722 is towards this

liquid crystal panel

5, and 721 of this incidence surfaces are the same sides that is positioned at the top glass substrate of this liquid crystal panel 5 with this drive IC 6.

This flexible PCB 73 possesses a first 731 and a second portion 732 is arranged, and formed (referring to Fig. 4) by a circuit layer 733, an inner insulating layer 734, a conductive layer 735 and an external insulation layer 736 at least in regular turn, wherein, extend perpendicular to the direction of these second portion 732 bearing of trends on the one side edge of this first 731, and make this flexible PCB 73 present a T shape structure or L shaped structure.This LED 74 is disposed at the position of this first 731 corresponding to this incidence surface 721, and passes this circuit layer 733 in regular turn with this inner insulating layer 734 and deeply to the position of this conductive layer 735.

See also Fig. 5 to Fig. 7, Fig. 5 is the sectional perspective outward appearance exploded view that shows first embodiment of the invention, and Fig. 6 is the partial perspective view behind the assembling glue frame in the displayed map 5, and Fig. 7 is the partial cutaway schematic of the 7-7 section among Fig. 5.As shown in the figure, when making this LCD 200, be the second portion 732 folding sides that cover the lower glass substrate 51 of this liquid crystal panel 5 with this flexible PCB 73, covering this drive IC 6 that is positioned at these top glass substrate 51 lateral surfaces, and with this conductive layer 735 with this flexible PCB 73 ground connection.Simultaneously, this liquid crystal panel 5 is enclosed within this glue frame 8 with this backlight module 7, so as to this liquid crystal panel 5 is firmly combined with this backlight module 7.

In the present embodiment, the preferred copper layer of electric conductivity is adopted in these conductive layer 735 suggestions.Simultaneously, the optical thin film 711 of this optical module 71 and 712 can need (as revising polarized light, astigmatism, optically focused, optical filtering etc.) according to the optics demonstration of reality and selects corresponding material for use, and can according to actual needs between this optical thin film 711 and 712, set up the above optical thin film of one deck separately.

The insider all can understand easily, when this drive IC 6 is sent a shows signal, can drive this liquid crystal panel 1 according to this shows signal show image.Because this LED74 contacts with the circuit layer 733 of this flexible PCB 73,, be communicated with the luminous circuit of this LED74 of driving along with this flexible PCB 73 so can utilize this circuit layer 733.Simultaneously, because this LED74 gos deep into this conductive layer 735, when this flexible PCB 73 is supplied electric power to this LED74 by this conductive layer 735, this LED74 sends a throw light, this throw light can throw the incidence surface 721 to this light guide plate 72 earlier, throw to this liquid crystal panel 5, so as to the backlight of this liquid crystal panel 1 shown image is provided via the incidence surface 722 of this light guide plate 73 then.

Simultaneously, see also Fig. 7, and in the lump with reference to figure 5.Because at the folding sides that are covered in the top glass substrate 51 of this liquid crystal panel 5 of the second portion 732 of this flexible PCB 73, and when covering this drive IC 6 that is positioned at these top glass substrate 51 lateral surfaces, this conductive layer 735 also coats simultaneously by this drive IC 6.Particularly formed by metal and during ground connection, the shielding effect of metal uniqueness can effectively be prevented this LCD 200 inner and extraneous electromagnetic interference (EMI) that electromagnetic wave caused of dispersing of system when this conductive layer 735.In addition, this inner insulating layer 734 also can effectively be prevented the electrostatic interference that system static is caused this luminous signal driving circuit with this external insulation layer 736.Therefore, by the structural design of this flexible PCB 73, can be under needn't the situation of external other assembly, can make these LCD 200 internal signals (particularly this drive IC 6 sent shows signal) possess better transmission stability.

Please continue to consult Fig. 8 and Fig. 9, Fig. 8 is the sectional perspective outward appearance exploded view that shows second embodiment of the invention, and Fig. 9 is the stereo appearance figure that shows second embodiment of the invention.As shown in the figure, in second embodiment of the invention, be that disclosed this LCD 200 of first embodiment is applied to a mobile phone 300.This mobile phone 300 possesses a body 9 is arranged, this body 9 includes a upper shell 91, a lower house 92 and an accommodation space 93, wherein this upper shell 91 has an engagement groove 911, this accommodation space 93 be at this upper shell 91 with after this lower house 92 combines, be formed at naturally between this upper shell 91 and this lower house 92.In the practice utilization, this liquid crystal panel 5 of this LCD 200 is the engagement grooves 911 that are incorporated into this upper shell 91.

Please continue to consult Figure 10, Figure 10 is the stereo appearance figure that shows third embodiment of the invention.As shown in the figure, in third embodiment of the invention, be that disclosed this LCD 200 of first embodiment is applied to a digital camera 400.This digital camera 400 possesses a body 9a is arranged, this body 9a includes a upper shell 91a, a lower house 92a and an accommodation space (not being shown in this figure), wherein, this upper shell 91a has an engagement groove 911a, this accommodation space be at this upper shell 91a with after this lower house 92a combines, be formed at naturally between this upper shell 91a and this lower house 92a.In the practice utilization, the liquid crystal panel 5 of this LCD 200 is the engagement groove 911a that are combined in this upper shell 91a.

The insider all can understand easily, because this LCD 200, can be under needn't the situation of external other assembly, can effectively prevent the interference that system electromagnetic wave and static cause its internal signal, make signal possess better transmission stability, therefore, when utilizing this LCD 200 to be assembled into this mobile phone 300, also can receive same effect with this digital camera 400.

That is, when utilizing electromagnetic interference (EMI) disclosed in this invention anti-system fabrication techniques mobile phone and digital camera, except having possessed the effect that effectively to prevent system electromagnetic wave and electrostatic interference, more can effectively reduce the assembly cost and the material cost of this mobile phone and digital camera.

By the above-mentioned embodiment of the invention as can be known, the value on the true tool industry of the present invention.Just above embodiment explanation only is the preferred embodiments of the present invention explanation, and the insider is when doing other all improvement and variation according to the above embodiment of the present invention explanation.Yet all improvement and variation that these are done according to the embodiment of the invention are in the scope that still belongs to invention spirit of the present invention and define.

Claims

1. LCD comprises:

One liquid crystal panel;

A plurality of drive integrated circults are disposed at a side of this liquid crystal panel;

One backlight module is located at the below of this liquid crystal panel, and it comprises:

One light guide plate has an exiting surface and an incidence surface, and wherein this exiting surface is corresponding to this liquid crystal panel, and this incidence surface then is to be positioned at same side with above-mentioned drive IC;

One flexible PCB, its inside has a conductive layer, this flexible PCB has first and second portion, wherein this first is provided with at least one light emitting diode corresponding to this incidence surface, this second portion then is the side that is covered in this liquid crystal panel, and above-mentioned drive IC is formed capture-effect.

2. LCD according to claim 1 is characterized in that, the conductive layer of this flexible PCB is the copper layer.

3. LCD according to claim 1 is characterized in that, the conductive layer of this first can provide this LED luminous required power supply.

4. LCD according to claim 1 is characterized in that, the conductive layer ground connection of this second portion.

5. LCD according to claim 1 is characterized in that, this flexible PCB is a T shape structure.

6. LCD according to claim 1 is characterized in that, also comprises a plurality of optical thin films, is arranged between this light guide plate and this liquid crystal panel.

7. LCD according to claim 1 is characterized in that, comprises that also a glue frame can combine this liquid crystal panel and this backlight module.

8. mobile phone comprises:

One body has an engagement groove;

One LCD according to claim 1 is located in this engagement groove.

9. digital camera comprises:

One body has an engagement groove;

One LCD according to claim 1 is located in this engagement groove.