CN201126773Y - Electroluminescence component for keyboard backlight system as well as keyboard backlight system - Google Patents
Electroluminescence component for keyboard backlight system as well as keyboard backlight system Download PDFInfo
- Publication number
- CN201126773Y CN201126773Y CNU2007203056184U CN200720305618U CN201126773Y CN 201126773 Y CN201126773 Y CN 201126773Y CN U2007203056184 U CNU2007203056184 U CN U2007203056184U CN 200720305618 U CN200720305618 U CN 200720305618U CN 201126773 Y CN201126773 Y CN 201126773Y
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- Prior art keywords
- layer
- sheet
- keymat
- keyboard
- electroluminescence
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Abstract
The utility model provides an electroluminescence component used for a keyboard backlight system, comprising an electroluminescence sheet (1) and a first keyboard pad forming layer (2a) and a first keyboard pad forming layer (2b) which are adhered on two surfaces of the electroluminescence sheet (1). In the utility model, the electroluminescence sheet replaces sheet supporting the keyboard pad, and the electroluminescence sheet and the keyboard pad are integrated so as to simplify structure of the keyboard backlight system of mobile phone. The electroluminescence component of the utility model both effectively overcomes an adhesion problem of electroluminescence backlight and forms effective protection for the electroluminescence sheet via the covered keyboard pad forming layer, so as to improve service life of the electroluminescence component. The utility model also provides the keyboard backlight system using the electroluminescence component. The keyboard backlight system has the advantages of convenient installation, thinner thickness, homogeneous light, long service life and little influence for keyboard tactility.
Description
Technical field
The utility model is electroluminescence (EL) assembly and the keyboard back light system that is used for the keyboard back light system about a kind of.
Background technology
Because electroluminescent cell is the area source of sheet, thin thickness is luminous evenly, and power consumption is minimum, and people adopt EL sheet to substitute the backlight of LED in the past as the cell phone keyboard back light system.EL sheet comes down to a capacitor, the typical structure of EL sheet is a layer structure, comprises two electrode layers, has dielectric layer between two electrode layers, one of them electrode layer is an euphotic electrode layer, has luminescent layer between transparent electrode layer and the dielectric layer.Electrode layer is applied AC power can make luminescent layer luminous.The making of EL sheet normally by vacuum sputtering tin indium oxide (ITO) layer on PETG (PET) base material to form the PET/ITO conducting film; form luminescent layer, dielectric layer and back electrode, insulating barrier successively with silk screen printing then on the PET/ITO conducting film, insulating barrier generally has defencive function concurrently.
Existing cell phone keyboard back light system, as shown in Figure 1, wherein EL sheet 1 is installed on the wiring board 7 and forms backlight, is placed on the below of etching keyboard matrix 6.The keyboard matrix contacts with the wiring board 7 with arch metal clips 8 by keymat.Keymat is to make by double-faced forming on Merlon (PC) sheet material 4.At the positive first keymat shape layer 2a that forms of PC sheet, its have the keyboard etching in shape projection 3 cooperate with etching keyboard matrix 6, form the second keymat shape layer 2b at the PC sheet back side, it is corresponding with arch metal clips 8 on the wiring board 7 that it has a cylindric lower convexity 5.Wherein, Chang Yong PC sheet material 4 thickness are about 100 microns.EL sheet 1, the thickness of its PET/ITO conducting film is generally the 75-125 micron, and monoblock EL sheet 1 thickness reaches the 180-230 micron.Though the even power consumption of its illumination is little,, influenced the sense of touch of button greatly because the PET substrate is thick and hard.In order to address this problem, usually with the die-cut formation key hole of the part of EL sheet 1 corresponding arch metal clips 8 (as shown in Figure 1).But this has influenced the uniformity of keyboard back light again.
Occurred at present the PET/ITO conducting film of 25-50 micron thickness on the market, this can improve the influence of the EL sheet of no key hole to the button sense of touch to a certain extent.But because flexibility, ductility and the anti-bending of PET material are all relatively poor, EL sheet has on the irregular supporting wiring board of arch shrapnel, can't form effectively and adhere to.In addition, in the keyboard use, EL sheet directly contacts with metal clips, thereby easy damage of EL sheet appearance influences function.These factors have limited the application of EL sheet on keyboard back light to a great extent.
The utility model content
The purpose of this utility model is EL sheet adhesion effect difference and the flimsy shortcoming of appearance that is used for the keyboard back light system in the prior art in order to overcome, and the keyboard back light system that a kind of EL sheet adhesion effect is good and appearance is not allowed flimsy electroluminescence part and comprised this electroluminescence part is provided.
The utility model provides a kind of electroluminescence part, and wherein, this assembly comprises EL sheet and attached to two lip-deep keymat shape layers of this EL sheet.
The utility model also provides a kind of keyboard back light system, this system comprises keyboard matrix, wiring board and is used for electroluminescent element, describedly be used for electroluminescent element between keyboard matrix and wiring board, it is wherein, described that to be used for electroluminescent element be electroluminescence part provided by the invention.
The utility model provide as the electroluminescence part in keyboard back light source because with the fixing EL sheet of two sheet keypad liner shape layers, thereby the EL sheet adhesion effect is good and appearance is not easy damage; In addition, because EL sheet has replaced the PC sheet material that supports keymat, EL sheet and keymat are united two into one, thereby simplified the structure of electroluminescence part.
The keyboard back light system that the utility model provides, adopt with two sheet keypad liner shape layers fixedly the electroluminescence part replacement independently keymat of the prior art and the EL sheet of EL sheet formation, thereby, on the one hand, fit with etching keyboard matrix in the top, solved the then problem of etching keyboard matrix and arch shrapnel, the attachment issue of putting that has overcome the electroluminescence backlight source has been arranged; On the other hand, the keymat shape layer that the skin of the electroluminescence chip module that the utility model provides coats can form effective protection to EL sheet, has improved its button greatly and has clicked the life-span.Thus, the utility model provides a kind of simple installation, thinner thickness, illumination is even, the life-span is long and the button sense of touch is influenced little keyboard electroluminescence backlight system.
Description of drawings
Fig. 1 is the profile that uses the keyboard back light system of EL sheet structure in the prior art;
Fig. 2 is the profile of the keyboard back light system of electroluminescence part structure of the present utility model;
Fig. 3 is the profile of EL sheet;
Fig. 4 is the electroluminescence part and the wiring board connection diagram of keyboard back light of the present utility model system.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
As shown in Figure 2, the electroluminescence part that the utility model provides is a layer structure, comprises EL sheet 1 and attached to two the lip-deep first keymat shape layer 2a and the second keymat shape layer 2b of this EL sheet 1.This EL sheet has replaced original in to support the sheet material of keymat, forms composite component directly as the keyboard back light source with the keymat shape layer.
The thickness of described EL sheet 1 can be the 100-150 micron, and the thickness of the described first keymat shape layer 2a and the first keymat shape layer 2b can be the 100-500 micron separately.
For the ease of being used for the keyboard back light system, under the preferred situation, the surface of the described first keymat shape layer 2a also has keyboard etching projection 3 in shape, and the surface of the described second keymat shape layer 2b also has cylindric lower convexity 5.Above-mentioned electroluminescence part is applied to the keyboard back light system, and on the one hand, its integral body is attached to etching keyboard matrix 6 belows, and the upward projection 3 by the first keymat shape layer 2a goes up correspondingly-shaped forms good fit with etching keyboard matrix 6; On the other hand; its integral body is positioned at the top of wiring board 7; going up the lower convexity 5 of correspondingly-shaped by the second keymat shape layer 2b contacts with arch metal clips 8 on the wiring board 7; EL sheet 1 no longer directly contacts with arch metal clips 8; thereby protected EL sheet 1, made it avoid impaired.
In the utility model, the material of described keymat shape layer can adopt any material that can be used for making keymat known to a person of ordinary skill in the art, as the silica gel vulcanizing material.Wherein, the silica gel vulcanizing material can be preferably liquid silica gel for liquid silica gel and/or solid silicone.
In the utility model to the structure of described EL sheet with form that there is no particular limitation, can be to well known to a person skilled in the art various EL sheet, for example, described EL sheet, as shown in Figure 3, comprise transparent base 11, be formed on the transparency conducting layer 12 on the transparent base 11, be formed on the preceding electrode converging bar (not marking on the figure) on the transparent preceding electrode that constitutes by transparent base 11 and transparency conducting layer 12, be formed on the luminescent layer 13 on transparent preceding electrode and the busbar, be formed on the dielectric layer 14 on the luminescent layer, be formed on the dorsum electrode layer 15 on the dielectric layer, be formed on the back electrode busbar (not marking on the figure) on the dorsum electrode layer.
Described transparent base 11 is a film, its material can be selected from various transparent membrane known to a person of ordinary skill in the art, for example PETG (PET), Merlon (PC), polyvinyl chloride (PVC), thermoplastic polyurethane (TPU), polypropylene (PP) etc. are preferably PETG (PET) film.The thickness preferable range of described transparent membrane is the 25-75 micron.
Described transparency conducting layer 12 can be film formed by vacuum sputtering on transparent base 11 or silk screen printing oxide or macromolecule electrically conducting transparent.Wherein, oxide conducting material or macromolecule conducting material in the described transparency conducting layer 12 have no particular limits, can be selected from the various materials that can be used as transparency electrode known to a person of ordinary skill in the art, for example tin indium oxide (ITO), antimony tin (ATO), polyaniline (PANI), poly-dioxoethyl thiophene (PEDOT), polyphenylacetylene (PPV) etc. are preferably tin indium oxide (ITO).The thickness of described transparency conducting layer 12 is preferably the 20-40 nanometer.
Described luminescent layer 13 generally contains electroluminescent powder and binding agent, wherein the material to electroluminescent powder has no particular limits, can be selected from the various materials that can be used as electroluminescent powder known to a person of ordinary skill in the art, for example one or more in coating such as Zn:Cu, ZnS:Mn luminescent powder, the non-coating luminescent powder are preferably the coating luminescent powder.The granularity preferable range of described electroluminescent powder is the 25-35 micron.The weight ratio of described binding agent and electroluminescent powder is 1: 0.5-3 is preferably 1: 1.0-2.0.The thickness of described transparent luminescent layer 13 is preferably the 20-60 micron.
Described dielectric layer 14 generally contains medium powder and binding agent, and wherein the material to medium powder has no particular limits, and can adopt the various materials that can be used as medium powder known to a person of ordinary skill in the art, for example BaTiO
3Powder and/or TiO
2Powder is preferably BaTiO
3Powder is because BaTiO
3Dielectric constant higher.The granularity preferable range of described medium powder is the 0.5-1 micron.The weight ratio of described binding agent and medium powder is 1: 0.2-3.0 is preferably 1: 0.8-2.0.The thickness of described transparent dielectric layer 14 is preferably the 20-60 micron.
Binding agent in described luminescent layer 13 and the dielectric layer 14 is preferably and is the high-k flexible resin(a).Wherein, described high-k flexible resin(a) is cyanogen resin, fluororesin, for example one or more in polyvinyl alcohol cyanoethyl ether, cyanoethyl candy, cyanethyl cellulose, polyvinylidene fluoride, the polytetrafluoroethylene.Be preferably polyvinylidene fluoride resin.Adopt the purpose of high-k flexible resin(a) to be, in bonding electroluminescent powder and medium powder, make EL sheet have higher luminosity and better bending performance.
Electrode converging bar, back electrode busbar rise and compile the function of current before described, can be any suitable electrode material known to a person of ordinary skill in the art, for example silver-colored line, carbon line etc.
The material of described dorsum electrode layer 15 can be any suitable electrode material known to a person of ordinary skill in the art, for example silver slurry, carbon slurry etc.Described dorsum electrode layer can be a different shape according to practical situations.The thickness of described dorsum electrode layer 15 is preferably the 10-30 micron.
Under the preferable case, described EL sheet 1 also comprises the insulating barrier 16 that is formed on back electrode and the busbar, the material of described insulating barrier 16 can be any suitable dielectric ink known to a person of ordinary skill in the art, for example ultraviolet light polymerization dielectric ink, hot curing dielectric ink.The thickness of described insulating barrier 16 is preferably the 10-30 micron.
The electroluminescence part that provides in the utility model makes by carrying out the keymat moulding successively on described EL sheet two sides.The formation order of shape layer and compacted under layer is not particularly limited in the keymat moulding, can be set as required by those skilled in the art.
In the utility model, the manufacture method of EL sheet comprises the steps: 1) formation transparency conducting layer 12 on transparent membrane base material 11; 2) constitute by transparent base 11 and transparency conducting layer 12 transparent before form on the electrode before the electrode converging bar; 3) slurry that will contain electroluminescent powder, binding agent is coated on the described transparency conducting layer 12, forms luminescent layer 13; 4) slurry that will contain medium powder, binding agent is coated on the described luminescent layer 13, forms dielectric layer 14; 5) on dielectric layer 14, apply dorsum electrode layer 15; 6) on dorsum electrode layer 15, form the back electrode busbar; 7) on dorsum electrode layer 15, be coated with insulating layer coating 16.Insulating barrier is optional as requested.
In the utility model, the formation method of the transparency conducting layer 12 of described EL sheet can adopt the known any generation type of those skilled in the art, for example rotates coating, silk screen printing, vacuum splashing and plating etc., is preferably vacuum splashing and plating.
Described coating can be adopted the known any coating method of those skilled in the art, and for example rotation coating, silk screen printing etc. are preferably silk screen printing.Can carry out drying after each the coating, described drying can adopt the known any drying mode of those skilled in the art, for example far infrared baking, and the temperature when dry is 50-150 ℃, be preferably 70-130 ℃, can be set as required drying time by those skilled in the art.
The described slurry that contains electroluminescent powder, binding agent, wherein the weight ratio of binding agent and electroluminescent powder is 1: 0.5-3 is preferably 1: 1.0-2.0.Solvent can be in your ketone of dimethyl formamide, dimethylacetylamide, cyclohexanone, different fluorine one or more.Amount of solvent is 0-30 weight %, is preferably 2.5-20 weight %.
The described slurry that contains medium powder, binding agent.Wherein the weight ratio of binding agent and medium powder is 1: 0.2-3.0 is preferably 1: 0.8-2.0.Solvent can be in your ketone of dimethyl formamide, dimethylacetylamide, cyclohexanone, different fluorine one or more.Amount of solvent is 0-30 weight %, is preferably 2.5-20 weight %.
Described keymat silica gel forming method can adopt the known any curing molding mode of those skilled in the art, and for example injection moulding, hot-forming etc. is preferably hot-forming.Described forming and hardening condition, the temperature of moulding is 70-160 ℃, is preferably 100-130 ℃, and briquetting pressure is the 0.5-3 MPa, is preferably the 1-2 MPa, and hot pressing time can be set as required by those skilled in the art.
In the utility model, the electroluminescence plate electrode is drawn and can be carried out before the keymat moulding.As shown in Figure 4, earlier contact conductor 130 is fitted in electrode tip 120 places of EL sheet busbar 110, carries out the keymat moulding again.Contact conductor 130 is coated by the keymat shape layer with the end that EL sheet 1 is fitted, and the other end is exposed at outside the keymat shape layer, and is connected with the drive circuit electrode 200 of drive circuit area 210 on the circuit board.
Electrode is drawn also and can be carried out after the keymat moulding.This method need not form shape layer at EL sheet electrode tip 120 places when the keymat moulding.After the keymat moulding, at EL sheet electrode tip 120 places that expose, applying contact conductor 130 encapsulates with fluid sealant again.Drive circuit electrode 200 on contact conductor 130 other ends and the circuit board electrode lead-in wire is connected.
To EL sheet 1 output voltage, it is luminous to drive the inorganic EL powder by contact conductor 130 for drive circuit on the utility model circuit board.
Described contact conductor 130 is not particularly limited, and can be the known any lead-in wires of these those skilled in the art, and for example nickel sheet, aluminium flake, FPC lead-in wire etc. are preferably the FPC lead-in wire.
The method that described lead-in wire is fitted is not particularly limited, and can be the known any applying methods of these those skilled in the art, and for example soldering, Laser Welding, conducting resinl applying etc. are preferably conducting resinl and fit.
The keyboard back light system that the utility model provides comprises keyboard matrix, wiring board and is used for electroluminescent element, and described to be used for electroluminescent element be electroluminescence part of the present utility model, between keyboard matrix and wiring board.
According to the keyboard back light system that the utility model provides, described keyboard matrix can be to well known to a person skilled in the art various keyboard matrixes, for example metal etch keyboard matrix, plastic cement etching keyboard matrix etc.Described wiring board can be to well known to a person skilled in the art various wiring boards, for example, the wiring board that is used for the cell phone keyboard back light system, this wiring board can comprise metal clips, the keymat compacted under layer of described electroluminescence part contacts with the metal clips on the wiring board.
Because the utility model only relates to and improving being used for electroluminescent element, there is no particular limitation to other each parts in the keyboard back light system such as the annexation between keyboard matrix and the wiring board and structure, can be to well known to a person skilled in the art various annexations and structure.
Claims (10)
1. electroluminescence part that is used for the keyboard back light system, it is characterized in that this assembly comprises EL sheet (1) and attached to two the lip-deep first keymat shape layers (2a) and the second keymat shape layer (2b) of this EL sheet (1).
2. electroluminescence part according to claim 1, wherein, the thickness of described EL sheet (1) is the 100-150 micron, the thickness of the first keymat shape layer (2a) and the second keymat shape layer (2b) the 100-500 micron of respectively doing for oneself.
3. electroluminescence part according to claim 1 and 2, wherein, described EL sheet (1) comprises transparent membrane base material (11) and is formed on the transparency conducting layer (12) on the transparent membrane base material (11), preceding electrode converging bar, luminescent layer (13), dielectric layer (14), dorsum electrode layer (15) and back electrode busbar successively.
4. electroluminescence part according to claim 3, wherein, the thickness of described film substrate (11) is the 25-75 micron, the thickness of described transparency conducting layer (12) is the 20-40 nanometer, the thickness of described luminescent layer (13) is the 20-60 micron, the thickness of described dielectric layer (14) is the 20-60 micron, and the thickness of described dorsum electrode layer (15) is the 10-30 micron.
5. electroluminescence part according to claim 3, wherein, described EL sheet (1) also comprises the insulating barrier (16) that is formed on dorsum electrode layer (15) and the busbar.
6. electroluminescence part according to claim 5, wherein, the thickness of described insulating barrier (16) is the 10-30 micron.
7. electroluminescence part according to claim 1, wherein, the described first keymat shape layer (2a) and the second keymat shape layer (2b) are the silica gel shape layer.
8. electroluminescence part according to claim 1, wherein, described keymat shape layer comprises projection (3) and lower convexity (5), the described projection (3) that goes up is positioned on first surface of keymat shape layer (2a) away from EL sheet (1), and described lower convexity (5) is positioned on second surface of keymat shape layer (2b) away from EL sheet (1).
9. keyboard back light system, this system comprises keyboard matrix, wiring board and is used for electroluminescent element, describedly be used for electroluminescent element between keyboard matrix and wiring board, it is characterized in that described to be used for electroluminescent element be any described electroluminescence part of claim 1-8.
10. keyboard back light according to claim 9 system, wherein, the keymat compacted under layer of described electroluminescence part contacts with the metal clips on the wiring board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007203056184U CN201126773Y (en) | 2007-11-27 | 2007-11-27 | Electroluminescence component for keyboard backlight system as well as keyboard backlight system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007203056184U CN201126773Y (en) | 2007-11-27 | 2007-11-27 | Electroluminescence component for keyboard backlight system as well as keyboard backlight system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201126773Y true CN201126773Y (en) | 2008-10-01 |
Family
ID=40000240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007203056184U Expired - Fee Related CN201126773Y (en) | 2007-11-27 | 2007-11-27 | Electroluminescence component for keyboard backlight system as well as keyboard backlight system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201126773Y (en) |
-
2007
- 2007-11-27 CN CNU2007203056184U patent/CN201126773Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081001 Termination date: 20151127 |