CN1564649A - Soft circuit board structure and electronic device for preventing soft circuit board from centralized stress when bending - Google Patents
Soft circuit board structure and electronic device for preventing soft circuit board from centralized stress when bending Download PDFInfo
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- CN1564649A CN1564649A CN 200410030201 CN200410030201A CN1564649A CN 1564649 A CN1564649 A CN 1564649A CN 200410030201 CN200410030201 CN 200410030201 CN 200410030201 A CN200410030201 A CN 200410030201A CN 1564649 A CN1564649 A CN 1564649A
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- circuit board
- flexible circuit
- kink
- panel
- stress
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- 238000005452 bending Methods 0.000 title claims description 39
- 238000009434 installation Methods 0.000 claims description 43
- 230000012447 hatching Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000012788 optical film Substances 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 101001045744 Sus scrofa Hepatocyte nuclear factor 1-beta Proteins 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The device consists of a first flexible printed circuit board, a second printed circuit board. The first printed circuit board has a first kink part. The second flexible printed circuit board has a second kink part. The second kink part drills through the first kind part.
Description
Technical field
The present invention relates to a kind ofly prevent that flexible circuit board when bending from the electronic installation that stress is concentrated taking place, particularly relate to a kind of flexible circuit board structure of LCD, it can make the phenomenon that interconnective two flexible circuit boards can not be peeled off when bending.
Background technology
Flexible circuit board (FPCB) is in the electric connection between the different circuit that have been widely used in the electronic installation.Because flexible circuit board has bent, light and handy characteristic, except can effectively saving the inner space of electronic installation, also can assemble expediently.
With the LCD 100 shown in Figure 1A, the 1B ' be example, wherein, Figure 1A show known LCD 100 ' decomposing schematic representation, Figure 1B show known LCD 100 ' the combination front view.
LCD 100 ' comprise upper casing 10 ', a panel 20 ', a flexible circuit board 30 that is used for panel ', multilayer optical film 21 ', a light source 40 ', a flexible circuit board 50 that is used for light source ', a light guide plate 41 ', a plastic frame 42 ', a reflecting plate a 43 ' and lower casing 60 '.Above-mentioned 40 ', 41 ', 42 ', 43 ' etc. combination of components become a backlight module.
Can find out by Figure 1A, panel 20 ' be arranged at upper and lower shell 10 ', 60 ' between, and light source 40 ' be arranged on lower casing 60 ' on.By signal that panel 20 ' institute sends or receives through panel with flexible circuit board 30 ' be sent on other interface of electronic installation, panel with flexible circuit board 30 ' connection panel 20 ' one sides and protrude in upper and lower shell 10 ', 60 ', this with ledge be defined as a kink 32 '.When assembling, this kink 32 ' backward (towards the B direction) bending 90 degree or 180 degree are so so that interconnect with other interface of electronic installation.
On the other hand, the backlight liquid crystal display module can be divided into ora terminalis formula (edge lighttype) and straight-down negative (direct light type) two big classes usually.With ora terminalis formula backlight module is example, because ora terminalis formula backlight module is applied in the small-sized LCD mostly, generally is to adopt light-emitting diode (LED) as its light source.Shown in Figure 1B, light source 40 ' expression light-emitting diode, light source with flexible circuit board 50 ' connection light source 40 ', by light source with its needed electric power and signal of flexible circuit board 50 ' provide.
Have again because the size of light source 40 ' (LED) is less, light source is with flexible circuit board 50 ' comparatively elongated, light source 40 ', light source with flexible circuit board 50 ' be co-located on panel 20 ' and lower casing 60 ' between.In addition, light source with flexible circuit board 50 ' a part protrude in lower house 10 ', 60 ', its ledge be a kink 52 '.When kink 52 ' with panel with flexible circuit board 30 ' kink 32 ' after interconnecting, at this moment just can with its simultaneously with the modes of 180 degree be bent to panel 20 ' the dead astern.
When carry out two flexible circuit boards 30 ', 50 ' between the connection operation time, generally finish (shown in Figure 1B) via welding manner, wherein, symbol 31 ', 51 ' expression two flexible circuit boards 30 ', 50 ' tie point.
Fig. 1 C show known LCD 100 ' combination and simultaneously crooked two flexible circuit boards 30 ', 50 ' rearview.Fig. 1 D show the panel observed along the directions X of Figure 1B and flexible circuit board 30 ', 50 ' schematic side view under bending state, wherein, dotted line represent panel with flexible circuit board 30 ' with the state of light source with flexible circuit board 50 ' when not bending.
Yet, because length two kinks 32 inequality ', 52 ' between be by tie point 31 ', 51 ' fixing, and two kinks 32 ', 52 ' between panel 20 ' have a set thickness (being about 0.63mm), thereby when distortion two kinks 32 ', 52 ' between can have different radius of curvature respectively.
Therefore, when carrying out the bending operation of about 180 degree towards panel 20 ' rear, two kinks 32 ', 52 ' between by tie point 31 ', 51 ' closely fixing, and light source is with the restriction of flexible circuit board 50 ' the be subjected to bigger panel of lateral curvature radius with flexible circuit board 30 ' center on, so will make the less light source of inboard radius of curvature with flexible circuit board 50 ' do not have enough spaces can make it crooked smoothly, thereby make kink 52 ' be extruded and produce warpage.
Kink 52 after extruding ' meeting produces the problem of warpage, tie point 31 ', 51 ' will concentrate because of welding produces stress in the turning point, to make like this two flexible circuit boards 30 ', 50 ' between produce and to peel off phenomenon, cause assembling inefficacy, waste material, increase built-up time and can't effectively reduce assembly cost.
Summary of the invention
Therefore, the object of the invention be to provide a kind of electronic installation with and flexible circuit board structure, can prevent when interconnective two flexible circuit boards from bending at the same time the phenomenon that can above-mentioned warpage not take place and then peel off because both bending curvatures are different.
According to the present invention, provide a kind of preventing when flexible circuit board from bending the electronic installation that stress is concentrated to take place, comprise one first flexible circuit board and one second flexible circuit board.First flexible circuit board comprises one first kink.Second flexible circuit board comprises one second kink, and second kink passes first kink.
In a preferred embodiment, first kink has an opening, and second kink passes first kink via opening.In this embodiment, electronic installation is a LCD.LCD also comprises a panel and a light source, and panel is connected with first kink, and light source is connected with second kink.
In another preferred embodiment, electronic installation of the present invention also comprises a light source and a panel, and light source is connected with first kink, and panel is connected with second kink.
According to the foregoing description, second kink comprises a cantilever portion, and cantilever portion bends and pass the opening of first kink.
In another variation example, second flexible circuit board also comprises a hole, and first kink and second kink pass the hole of second flexible circuit board simultaneously, and panel is connected with second flexible circuit board.
In another preferred embodiment, first kink has a breach, and second kink passes first kink via breach.In this embodiment, electronic installation is a LCD.LCD also comprises a panel and a light source, and panel is connected with this first kink, and light source is connected with second kink.
In another preferred embodiment, electronic installation of the present invention also comprises a light source and a panel, and light source is connected with first kink, and panel is connected with second kink.
The present invention also provides a kind of flexible circuit board structure that stress is concentrated that takes place when preventing to bend, and comprises one first flexible circuit board and one second flexible circuit board.First flexible circuit board comprises one first kink and one first connecting portion.Second flexible circuit board comprises one second kink and one second connecting portion.First connecting portion is connected in second connecting portion, and second kink passes first kink.
In a preferred embodiment, first kink has an opening, and second kink passes first kink via opening.
In addition, second kink comprises a cantilever portion, and cantilever portion bends and pass the opening of first kink.
Change in the example one, second flexible circuit board also comprises a hole, and first kink and second kink pass the hole of second flexible circuit board simultaneously.
In another preferred embodiment, first kink has a breach, and second kink passes first kink via breach.
In addition, first flexible circuit board is a panel flexible circuit board, and second flexible circuit board is a light source flexible circuit board.
In addition, first flexible circuit board is a light source flexible circuit board, and second flexible circuit board is a panel flexible circuit board.
Description of drawings
For above-mentioned and other purposes of the present invention, feature and advantage can be become apparent, especially exemplified by a preferred embodiment and conjunction with figs., elaborate below, in the accompanying drawing:
Figure 1A shows known electronic installation decomposing schematic representation;
Figure 1B shows known electronic installation combination front view;
Fig. 1 C shows that known group of electronic devices merges the rearview of crooked two flexible circuit boards simultaneously;
Fig. 1 D shows the panel and the schematic side view of flexible circuit board when bending state of observing along the directions X of Figure 1B;
Fig. 2 A shows the decomposing schematic representation of the electronic installation of first embodiment of the invention;
Fig. 2 B shows the combination front view of the electronic installation of first embodiment of the invention;
The local enlarged diagram of Fig. 2 C displayed map 2B;
Fig. 2 D shows panel and the profile of two flexible circuit boards when bending state of observing along the XX hatching of Fig. 2 C;
Fig. 2 E shows the schematic diagram of two flexible circuit boards when bending state of being observed by the B direction of Fig. 2 A;
Fig. 3 A shows the decomposing schematic representation of the electronic installation of second embodiment of the invention;
Fig. 3 B shows the combination front view of the electronic installation of second embodiment of the invention;
Fig. 3 C shows panel and the profile of flexible circuit board when bending state of observing along the YY hatching of Fig. 3 B;
Fig. 4 A shows the decomposing schematic representation of the electronic installation of second embodiment of the invention;
Fig. 4 B shows the combination front view of the electronic installation of second embodiment of the invention;
Fig. 4 C shows by the panel of the unilateral observation of Fig. 4 B and the flexible circuit board end view when the bending state.
Embodiment
Main purpose of the present invention is to avoid to produce between interconnective two flexible circuit boards generation that stress such as concentrated, peels off at situation when bending.Electronic installation 100 in the embodiments of the invention mainly describes with LCD, but does not limit the scope of the invention.
First embodiment
Fig. 2 A shows the decomposing schematic representation of the electronic installation 100 of first embodiment of the invention, and Fig. 2 B shows the combination front view of the electronic installation 100 of first embodiment of the invention.For the annexation between clear expression two flexible circuit boards 30,50, in Fig. 2 B, omitted upper casing 10, and since the present invention mainly be at the panel in the LCD with and light source propose to improve with the syndeton between the flexible circuit board 30,50, omitted other associated component in the LCD at this.
Shown in Fig. 2 A and Fig. 2 B, LCD 100 comprises a upper casing 10, a panel 20, multilayer optical film 21, a light source 40, one first (light source is used) flexible circuit board 50, one second (panel is used) flexible circuit board 30, a light guide plate 41, a plastic frame 42, a reflecting plate 43 and a lower casing 60.
Below being directed to panel 20, light source 40, the structure of first and second flexible circuit board 50,30 and mutual annexation thereof explains.
Referring to Fig. 2 C, the local enlarged diagram of the coupling part of first, second flexible circuit board 50,30 among Fig. 2 C displayed map 2B.
In addition, second flexible circuit board 30 sever part, that is, cantilever portion 32a has a width D
2, correspond to the width D of the opening 53 on first flexible circuit board 50
1, wherein, width D
2Be slightly less than width D
1Because the width D of the cantilever portion 32a of second kink 32
2Width D less than opening 53
1, when first, second kink 52,53 simultaneously backward during double flat, the cantilever portion 32a of second kink 32 can pass opening 53.
Furtherly, Fig. 2 D shows the panel 20 observed along the X-X hatching of Fig. 2 C and flexible circuit board 30,50 profile when bending state, it should be noted, this figure has omitted last lower casing 10,60 conveniently to illustrate.
When first and second flexible circuit board 50,30 is combined in the lower casing 10,60 and is positioned at the both sides of panel 20, joint by first connecting portion 51 and second connecting portion 31, dotted line is represented the state of first and second flexible circuit board 50,30 when not bending among the figure, and solid line is then represented first and second kink 52,32 dead asterns towards panel 20 (towards the B direction) state of double flat simultaneously.When both bent simultaneously, second kink 32 can pass the opening 53 on first kink 52 of first flexible circuit board 50, win kink 52 and second kink 32 are staggered mutually via opening 50 and does not disturb mutually.In other words, this embodiment avoids stress to exist in the mode of spatial offset.
Below change example at one of above-mentioned first embodiment and describe.
First and second kinks 52,32 are behind double flat under the situation about not interfering with each other, except the cantilever portion 32a of second kink, the main part 32b of second flexible circuit board 30 also need be towards B direction bending 90 degree, so that be connected with other interface of electronic installation.Therefore, second flexible circuit board 30 also comprises a hole 36, shown in Fig. 2 E, is observed by the back surface B direction of LCD, and this hole 36 has a width W
2, width W
2Width W greater than first kink 52
1 Hole 36 is continued to extend by above-mentioned specified path 33, make win kink 52 and second kink 32 pass the hole 36 of second flexible circuit board 30 of panel 20 simultaneously, make first and second kink 52,32 and second flexible circuit board 30 when bending, can not produce stress, and can prevent to peel off the generation of phenomenon.
Have, because the geometry of opening 53 is according to conditional decisions such as the bending length difference of plate thickness, flexible circuit board, curvature differences, so the size of opening 53, size are not subjected to the restriction of present embodiment again.
Second embodiment
Fig. 3 A shows the decomposing schematic representation of the electronic installation 100 of second embodiment of the invention, and Fig. 3 B shows the combination front view of the electronic installation 100 of second embodiment of the invention.It should be noted that in order to highlight flexible circuit board 30,50 of the present invention, Fig. 3 B has omitted upper casing 10 conveniently to illustrate.
In the present embodiment, the part identical with first embodiment will repeat no more, and its difference is: on a perforate 34 is formed at second (panel with) flexible circuit board 30, first (light source with) flexible circuit board 50 does not have opening.After first and second flexible circuit boards 50,30 were connected by first and second connecting portions 51,32, shown in Fig. 3 B, first kink 52 will partly be exposed to the perforate 34 of second flexible circuit board 30.
Fig. 3 C shows the panel 20 observed along the Y-Y hatching of Fig. 3 B and flexible circuit board 30,50 profile when bending state, first and second kinks 32,52 are simultaneously backward during double flat, shown in Fig. 3 C, first kink 52 passes second kink 32 via perforate 34.Therefore, first and second flexible circuit boards 50,30 stagger mutually by perforate 34 and do not disturb mutually.Therefore in other words, this embodiment avoids stress to exist in the mode of spatial offset equally, and that causes in the time of can preventing to bend peels off phenomenon.
Have, because the geometry of perforate 34 is conditional decisions such as bending length difference, curvature difference according to plate thickness, flexible circuit board, so the size of perforate 34, size are not subjected to the restriction of present embodiment again.
The 3rd embodiment
Fig. 4 A shows the decomposing schematic representation of the electronic installation 100 of third embodiment of the invention, and Fig. 4 B shows the combination front view of the electronic installation 100 of third embodiment of the invention.It should be noted that in order to highlight flexible circuit board 30,50 of the present invention, Fig. 4 B has omitted upper casing 10 conveniently to illustrate.
In the present embodiment, the part identical with first embodiment will repeat no more, its difference is: on the periphery an of breach 35 is formed at second (panel with) flexible circuit board 30, on the other hand, need be first do not establish perforate on (light source with) flexible circuit board 50.When the joint operation carried out between first and second flexible circuit board 50,30, first connecting portion 51 of first flexible circuit board 50 is connected in second connecting portion 31 of second flexible circuit board 30.It should be noted that second connecting portion 31 is positioned at the periphery of breach 35 (shown in Fig. 4 B), therefore first kink 52 when combination is exposed to part the breach 35 of second flexible circuit board 30.
Fig. 4 C shows by Fig. 4 B unilateral observation panel 20 and flexible circuit board 30,50 end view when the bending state, and first and second kink 32,52 is double flat backward simultaneously.
First kink 52 passes second kink 32 via breach 35.Therefore therefore, first and second flexible circuit boards 50,30 stagger mutually by breach 35 and do not disturb mutually, and in other words, this embodiment avoids stress to exist in the mode of spatial offset equally, and that causes in the time of can preventing to bend peels off phenomenon.
Have, because the geometry of breach 35 is according to conditional decisions such as the bending length difference of plate thickness, flexible circuit board, curvature differences, so the size of breach 35, size are not subjected to the restriction of present embodiment again.
In sum, by architecture advances to flexible circuit board of the present invention, after combining the flexible circuit board that panel is used and light source is used, can not produce because of solder joint causes situation about can't transfer, and the kink of two flexible circuit boards that interconnect can stagger mutually, except can avoiding the stress existence, can prevent that also the solder joint place from producing unsuitable peeling off.
Though the present invention discloses with preferred embodiment; but it is not in order to limit the present invention; any those skilled in the art can make a little change and retouching, so protection scope of the present invention are defined with accompanying Claim without departing from the spirit and scope of the present invention.
Claims (19)
1. one kind prevents from when flexible circuit board from bending the electronic installation that stress is concentrated to take place, and comprising:
One first flexible circuit board comprises one first kink; And
One second flexible circuit board comprises one second kink, passes this first kink.
2. the electronic installation that stress is concentrated takes place when flexible circuit board from bending in as claimed in claim 1 preventing, wherein first kink has an opening, and second kink passes first kink via opening.
3. the electronic installation that stress is concentrated takes place when flexible circuit board from bending in as claimed in claim 2 preventing, wherein electronic installation is a LCD.
4. the electronic installation that stress is concentrated takes place when flexible circuit board from bending in as claimed in claim 3 preventing, wherein LCD also comprises a panel and a light source, and this panel is connected with first kink, and this light source is connected with second kink.
5. the electronic installation that stress is concentrated takes place when flexible circuit board from bending in as claimed in claim 3 preventing, wherein LCD also comprises a light source and a panel, and this light source is connected with first kink, and this panel is connected with second kink.
6. the electronic installation that stress is concentrated takes place when flexible circuit board from bending in as claimed in claim 5 preventing, wherein second kink comprises a cantilever portion, and this cantilever portion bends and pass the opening of first kink.
7. the electronic installation that stress is concentrated takes place when flexible circuit board from bending in as claimed in claim 2 preventing, wherein second flexible circuit board also comprises a hole, and first kink and second kink pass the hole of second flexible circuit board simultaneously.
8. the electronic installation that stress is concentrated takes place when flexible circuit board from bending in as claimed in claim 7 preventing, wherein electronic installation is a LCD, comprises a panel, and this panel is connected with second flexible circuit board.
9. the electronic installation that stress is concentrated takes place when flexible circuit board from bending in as claimed in claim 1 preventing, wherein first kink has a breach, and second kink passes first kink via this breach.
10. the electronic installation that stress is concentrated takes place when flexible circuit board from bending in as claimed in claim 9 preventing, wherein electronic installation is a LCD.
11. as claimed in claim 10 preventing when flexible circuit board from bending the electronic installation that stress is concentrated takes place, wherein LCD also comprises a panel and a light source, and this panel is connected with first kink, and this light source is connected with second kink.
12. as claimed in claim 10 preventing when flexible circuit board from bending the electronic installation that stress is concentrated takes place, wherein LCD also comprises a light source and a panel, and this light source is connected with first kink, and this panel is connected with second kink.
13. one kind the flexible circuit board structure that stress is concentrated takes place when preventing to bend, comprising:
One first flexible circuit board comprises one first kink and one first connecting portion; And
One second flexible circuit board comprises one second kink and one second connecting portion, and wherein, this first connecting portion is connected in this second connecting portion, and this second kink passes this first kink.
14. as claimed in claim 13 the flexible circuit board structure that stress is concentrated takes place when preventing to bend, wherein first kink has an opening, second kink passes first kink via this opening.
15. as claimed in claim 14 the flexible circuit board structure that stress is concentrated takes place when preventing to bend, wherein second kink comprises a cantilever portion, this cantilever portion bending is also passed the opening of first kink.
16. as claimed in claim 13 the flexible circuit board structure that stress is concentrated takes place when preventing to bend, wherein second flexible circuit board also comprises a hole, first kink and second kink pass the hole of second flexible circuit board simultaneously.
17. as claimed in claim 13 the flexible circuit board structure that stress is concentrated takes place when preventing to bend, wherein first kink has a breach, second kink passes first kink via this breach.
18. as claimed in claim 13 the flexible circuit board structure that stress is concentrated takes place when preventing to bend, wherein first flexible circuit board is a panel flexible circuit board, second flexible circuit is a light source flexible circuit board very.
19. as claimed in claim 13 the flexible circuit board structure that stress is concentrated takes place when preventing to bend, wherein first flexible circuit board is a light source flexible circuit board, second flexible circuit board is a panel flexible circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100302012A CN100358400C (en) | 2004-03-22 | 2004-03-22 | Soft circuit board structure and electronic device for preventing soft circuit board from centralized stress when bending |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100302012A CN100358400C (en) | 2004-03-22 | 2004-03-22 | Soft circuit board structure and electronic device for preventing soft circuit board from centralized stress when bending |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1564649A true CN1564649A (en) | 2005-01-12 |
| CN100358400C CN100358400C (en) | 2007-12-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100302012A Expired - Fee Related CN100358400C (en) | 2004-03-22 | 2004-03-22 | Soft circuit board structure and electronic device for preventing soft circuit board from centralized stress when bending |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100358400C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102447755A (en) * | 2010-10-15 | 2012-05-09 | 华晶科技股份有限公司 | Method for connecting bending flexible circuit board in mobile phone and flexible circuit board |
| CN103325314A (en) * | 2013-06-18 | 2013-09-25 | 友达光电(厦门)有限公司 | Display device |
| CN104869749A (en) * | 2015-04-17 | 2015-08-26 | 麦克思股份有限公司 | Electronic device |
| CN110320716A (en) * | 2018-03-29 | 2019-10-11 | 夏普株式会社 | Flexible distributing board and display device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0617308A1 (en) * | 1993-03-22 | 1994-09-28 | NCR International, Inc. | Liquid crystal display with integrated electronics |
| US7258423B2 (en) * | 2001-04-26 | 2007-08-21 | Brother Kogyo Kabushiki Kaisha | Recording head unit, method of manufacturing the same, and recording apparatus using the unit |
| CN1185915C (en) * | 2001-06-13 | 2005-01-19 | 佳能株式会社 | Flexible substrate, semiconductor device, camera device and X-ray camera system |
| JP2004054268A (en) * | 2003-06-20 | 2004-02-19 | Matsushita Electric Ind Co Ltd | Flexible film, circuit board and display device |
-
2004
- 2004-03-22 CN CNB2004100302012A patent/CN100358400C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102447755A (en) * | 2010-10-15 | 2012-05-09 | 华晶科技股份有限公司 | Method for connecting bending flexible circuit board in mobile phone and flexible circuit board |
| CN103325314A (en) * | 2013-06-18 | 2013-09-25 | 友达光电(厦门)有限公司 | Display device |
| CN103325314B (en) * | 2013-06-18 | 2015-07-01 | 友达光电(厦门)有限公司 | Display device |
| CN104869749A (en) * | 2015-04-17 | 2015-08-26 | 麦克思股份有限公司 | Electronic device |
| CN104869749B (en) * | 2015-04-17 | 2018-02-27 | 麦克思股份有限公司 | Electronic installation |
| CN110320716A (en) * | 2018-03-29 | 2019-10-11 | 夏普株式会社 | Flexible distributing board and display device |
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| Publication number | Publication date |
|---|---|
| CN100358400C (en) | 2007-12-26 |
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