WO2006126769A1 - Clavier luminescent ultramince - Google Patents

Clavier luminescent ultramince Download PDF

Info

Publication number
WO2006126769A1
WO2006126769A1 PCT/KR2005/004608 KR2005004608W WO2006126769A1 WO 2006126769 A1 WO2006126769 A1 WO 2006126769A1 KR 2005004608 W KR2005004608 W KR 2005004608W WO 2006126769 A1 WO2006126769 A1 WO 2006126769A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
keypad
light emitting
rear surface
protrusion
Prior art date
Application number
PCT/KR2005/004608
Other languages
English (en)
Inventor
Woon Ho Baek
Byung Dong Chun
In Shik Park
Kyoung Hyoun Lee
Original Assignee
Hanwool Information Tech. Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hanwool Information Tech. Co., Ltd. filed Critical Hanwool Information Tech. Co., Ltd.
Publication of WO2006126769A1 publication Critical patent/WO2006126769A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/22—Illumination; Arrangements for improving the visibility of characters on dials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/83—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by legends, e.g. Braille, liquid crystal displays, light emitting or optical elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2211/00—Spacers
    • H01H2211/006—Individual areas
    • H01H2211/01—Ink
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00—Legends
    • H01H2219/002—Legends replaceable; adaptable
    • H01H2219/018—Electroluminescent panel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2221/00—Actuators
    • H01H2221/002—Actuators integral with membrane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2227/00—Dimensions; Characteristics
    • H01H2227/022—Collapsable dome
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/002—Screen printing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2239/00—Miscellaneous
    • H01H2239/004—High frequency adaptation or shielding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2239/00—Miscellaneous
    • H01H2239/008—Static electricity considerations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/23—Construction or mounting of dials or of equivalent devices; Means for facilitating the use thereof

Definitions

  • the present invention relates to a super thin type light emitting keypad, and more particularly to a super thin type light emitting keypad formed with an EL (Electro Luminescence) device at an upper surface of a rear surface layer formed thereunder with a protrusion such that destruction caused by deformation of EL device can be prevented, light emitting efficiency and luminance can be increased, and an elastic substrate is disposed to remarkably improve click feeling and switching accuracy, and the EL device is equipped with a dispersion layer, a static electricity shield layer and a noise stop layer to enable to minimize influence of static electricity or electromagnetic wave and to provide a uniform light emitting surface.
  • EL Electro Luminescence
  • a light emitting keypad is applied to communication devices such as mobile phones for practical use as a switch for conducting various supplemental functions including signal generation, and particularly for conducting functions to distinguish and select keys for inputting characters or symbols at night or in a dark area, and concomitant with acceleration of thinning of the mobile phones, development of super thin light emitting keypads is keeping pace therewith.
  • a light emitting keypad of existing LED (Light Emitting Diode) method used as light source cannot be manufactured in thin type due to fabrication constraints and is manufactured in a relatively thick structure.
  • Another drawback of a light emitting keypad by the LED method is that a large amount of power is consumed to shorten the life of a battery.
  • Still another drawback is that light emitting uniformity cannot be maintained according to arranged position of LED resulting in a difficulty in design.
  • FIG.1 is a cross-sectional view of a known light emitting keypad by EL method for complementing the aforementioned drawbacks.
  • the keypad is disposed with a key top (110), a metal dome sheet
  • the EL metal dome sheet (120) is made of an EL sheet (121), a metal dome (123) and a base tape (122) to thereby enable to realize a super thin structure and a reduced power consumption.
  • PCB Printed Circuit Board
  • the present invention is conceived to solve the aforementioned problems and it is an object of the present invention to provide a super thin type light emitting keypad formed with an EL (Electro Luminescence) device at an upper surface of a rear surface layer formed thereunder with a protrusion such that destruction caused by deformation of EL device can be prevented, light emitting efficiency and luminance can be increased, and an elastic substrate is disposed to remarkably improve click feeling and switching accuracy, and the EL device is equipped with a dispersion layer, a static electricity shield layer and a noise stop layer to enable to minimize influence of static electricity or electromagnetic wave and to provide a uniform light emitting surface.
  • EL Electro Luminescence
  • the present invention provides a super thin type light emitting keypad comprising: an ink layer formed underneath an elastic substrate; an EL device formed underneath the ink layer; and a rear surface layer disposed underneath the EL device and having a protrusion.
  • the keypad further comprises: a contact terminal; and a Printed Circuit Board
  • the keypad further comprises an adhesive layer between the EL device and the rear surface layer.
  • the EL device comprises; an EL system for illuminating lights and at least one layer or more out of a dispersion layer at an upper surface or a lower surface of the EL system, a static electricity shield layer and a noise stop layer.
  • at least one or more out of the ink layer, the EL device, the rear surface layer and the protrusion is formed by screen printing method.
  • the protrusion is formed to the rear surface layer by thermo-compression method.
  • the protrusion and the rear surface layer are integrally formed.
  • the elastic substrate is a polycarbonate.
  • the present invention provides a super thin type light emitting keypad formed with an EL (Electro Luminescence) device at an upper surface of a rear surface layer formed thereunder with a protrusion such that destruction caused by deformation of EL device can be prevented, light emitting efficiency and luminance can be increased, and an elastic substrate is disposed to remarkably improve click feeling and switching accuracy, and the EL device is equipped with a dispersion layer, a static electricity shield layer and a noise stop layer to enable to minimize influence of static electricity or electromagnetic wave and to provide a uniform light emitting surface.
  • EL Electro Luminescence
  • FIG.1 is a cross-sectional view of a light emitting keypad by EL method according to the prior art.
  • FIG.2 is a cross-sectional view of a super thin light emitting keypad according to the present invention.
  • FIG.3 is a cross-sectional view of another embodiment of a super thin light emitting keypad according to the present invention.
  • FIG.4 is a cross-sectional view of a super thin light emitting keypad of EL device according to the present invention.
  • FIG.2 is a cross-sectional view of a super thin light emitting keypad according to the present invention.
  • the super thin light emitting keypad according to the present invention includes an ink layer (2) formed underneath an elastic substrate (1), an EL device (3) formed underneath the ink layer (2), and a rear surface layer (6) formed underneath the EL device (3) and equipped with a protrusion (6), where an adhesive layer (4) is further disposed between the EL device (3) and the rear surface layer (5) for the super thin light emitting keypad.
  • the elastic substrate (1) made of elastic material improves click feel on account of its elasticity, and enables an easy and smooth keypad manipulation even with a little force applied thereto.
  • an area for the predetermined key is particularly dented so that unwanted key areas are prevented from being dented and switched to thereby enable to effect an accurate switching.
  • the key is naturally returned to its original shape by the elasticity.
  • a separate elastic layer may be disposed, manufacturing process can be further simplified because the elastic substrate also functions as an elastic layer to make it possible to manufacture a thin keypad.
  • Material for the elastic substrate is not limited as long as it has elasticity.
  • PC polycarbonate
  • PET polyethylene terephthalate
  • polyurethane polyurethane
  • the thickness of the substrate (1) is preferred to be in the range of 100 ⁇ 400 ⁇ m.
  • the ink layer (2) designed to indicate a key for the keypad embodies a front shape of the keypad.
  • the ink layer is formed by coating keypad ink by way of spray or screen printing method at a bottom surface of the substrate (1), and it is preferred that the thickness of the ink layer be 5 ⁇ lO ⁇ m.
  • the EL device (3) which is an illuminating region is not particularly restricted in structure and fabricating method thereof, and structure and fabricating method of the EL device (3) disclosed or used for the technical field of the present invention may be selected without any restriction.
  • the thickness of the EL device is 100 ⁇ 150 ⁇ m in consideration of super thin structure and illuminating function.
  • the EL device is placed adjacent to the front of the keypad to enable to maximize the light emitting efficiency. Furthermore, luminance can be relatively increased due to no light loss caused by a key top made of silicon material according to the prior art.
  • the rear surface layer (5) is disposed thereunder with a protrusion (6) to provide a smooth keypad manipulation and click feeling and effective switching.
  • a protrusion (6) there is no limit to the material for the rear surface layer (5).
  • silicon and a high polymer resin may be selected.
  • liquid silicon, film silicon or high polymer resin is compression-molded to the rear surface layer (5) or the protrusion (6) under 100-150 degrees Celsius, or by photolithography method, ultraviolet hardening or infrared hardening ink is screen-printed for formation.
  • One example of forming the rear surface layer (5) to the EL device (3) is to provide a separate adhesive layer (4) for mutual adhesion, which is most preferred as this method enhances an adhesiveness.
  • the adhesive material is not limited but printing adhesive used for screen printing or an adhesive tape may be employed. More preferably, a primer used for adhesiveness is suitable.
  • FIG.3 is a cross-sectional view of a super thin light emitting keypad of EL device according to the present invention.
  • the present invention comprises a super- thin light emitting keypad further including a printed circuit board (8) disposed thereon with metal domes (82) and contact terminals (81) under the rear surface layer (5), and each dome (82) and contact terminal (81) spaced a predetermined distance apart thereon.
  • the printed circuit board (8) is disposed thereon with metal domes (82) and contact terminals (81).
  • FIG.4 is a cross-sectional view of a super thin light emitting keypad of EL device according to an embodiment of the present invention.
  • FIG. 4 is only an exemplary drawing and it should be apparent that modification of the layered order of illustrated structure and partial omission thereof all belong to the scope of the present invention.
  • the EL device (3) is fabricated by being layered on the ink layer (2) in sequence of a static electricity shield layer (31), a dispersion layer (32), an insulation layer (33), a front electrode layer (34), a light emitting layer (35), a dielectric layer (36), a rear electrode layer (37), an insulation layer (38), a noise stop layer (39) and an insulation layer (40).
  • the front electrode layer (34), the light emitting layer (35), the dielectric layer (36) and the rear electrode layer (37) comprise an EL system which is a light emitting structure of the EL device (3).
  • the fabricating method of the EL device (3) is to form the EL device (3) underneath the ink layer (2) by way of screen printing method for thin film structure.
  • the static electricity shield layer (31) is formed to guard against damage of circuit parts and EL system caused by generation of external static electricity and serves to discharge the generated static electricity to the PCB (8) or a device case via a ground terminal.
  • the static electricity shield layer (31) is made of material of high electric conductivity such as carbon, copper, silver, gold or the like.
  • the dispersion layer (32) functions to help improve the dispersion of light generated by the light emitting layer (35).
  • the dispersion layer (32) is made of material of good light transmission factor and may include various materials for improving dispersion of light.
  • various pigments, glass beads, calcium carbonite and the like may be selected.
  • the noise stop layer (39) functions to block the noise generated in the course of operating the EL device (3) by way of alternating current (AC) source.
  • the noise stop layer (39) is preferred to be disposed at a bottom surface of the EL device (3).
  • the noise may be effectively eliminated by using material having a high electric conductivity.
  • the materials having a high electric conductivity include carbon, copper, silver, gold or the like, but they are not limited thereto.
  • a fabricating method reverse from that of the present invention is also possible without departing from the spirit of the invention.
  • a rear surface layer may be first formed and then an elastic layer, an EL device (An inner structure in reverse sequence is also possible), an ink layer and an elastic substrate may be sequentially stacked without departing from the spirit and scope of the present invention.
  • the EL sheet may be specifically formed at a predetermined region under the ink layer.
  • the present invention having the features thus described provides a super thin type light emitting keypad formed with an EL (Electro Luminescence) device at an upper surface of a rear surface layer formed thereunder with a protrusion such that destruction caused by deformation of EL device can be prevented, light emitting efficiency and luminance can be increased, and an elastic substrate is disposed to remarkably improve click feeling and switching accuracy, and the EL device is equipped with a dispersion layer, a static electricity shield layer and a noise stop layer to enable to minimize influence of static electricity or electromagnetic wave and to provide a uniform light emitting surface.
  • the present invention applied to communication devices such as mobile phones can perform a signal generation and various supplementary functions, and particularly can be adequately used for a keypad having a function of distinguishing numbers or characters in the dark or at night.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Push-Button Switches (AREA)

Abstract

La présente invention concerne un clavier luminescent ultramince qui comprend un dispositif à électroluminescence sur la partie supérieure d'une couche de surface arrière placée sous le clavier. Ladite couche possède une forme protubérante qui évite toute dégradation liée à la déformation du dispositif à électroluminescence et qui accroît le rendement lumineux et la luminance. En outre, la présence d'un substrat élastique améliore considérablement la sensation de clic et la précision de sélection. Le dispositif à électroluminescence est doté d'une couche de dispersion, d'une couche de protection électrostatique et d'une couche antibruit minimisant les effets de l'électricité statique et des ondes électromagnétiques et créant une surface de sortie de la lumière uniforme.
PCT/KR2005/004608 2005-05-24 2005-12-28 Clavier luminescent ultramince WO2006126769A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2005-0043675 2005-05-24
KR1020050043675A KR100514759B1 (ko) 2005-05-24 2005-05-24 초박형 발광 키패드

Publications (1)

Publication Number Publication Date
WO2006126769A1 true WO2006126769A1 (fr) 2006-11-30

Family

ID=37304743

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2005/004608 WO2006126769A1 (fr) 2005-05-24 2005-12-28 Clavier luminescent ultramince

Country Status (2)

Country Link
KR (2) KR100514759B1 (fr)
WO (1) WO2006126769A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008085130A1 (fr) * 2007-01-31 2008-07-17 Sinco Technologies Pte Ltd Ielp (piston el intelligent)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100775742B1 (ko) 2005-08-29 2007-11-09 김용욱 키탑패드의 제조방법 및 키탑패드
KR100781589B1 (ko) 2006-09-04 2007-12-03 (주)파이컴엔지니어링 일체형 슬림 ｅｌ 키패드
KR100840620B1 (ko) 2006-12-29 2008-06-24 (주) 프렉코 휴대단말기용 키패드 제조방법
KR100894416B1 (ko) * 2008-01-18 2009-04-24 한울정보기술(주) 도파로 필름 및 이를 구비한 발광 키패드

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02265123A (ja) * 1989-04-05 1990-10-29 Fujitsu Ltd キーボード
JPH1196844A (ja) * 1997-09-22 1999-04-09 Porimatec Kk 照光式スイッチ
JP2003068161A (ja) * 2001-08-24 2003-03-07 Nec Kansai Ltd Ｅｌパネル及びｅｌパネル付きキースイッチ
JP2004063449A (ja) * 2002-06-03 2004-02-26 Seiko Precision Inc 照光式スイッチ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02265123A (ja) * 1989-04-05 1990-10-29 Fujitsu Ltd キーボード
JPH1196844A (ja) * 1997-09-22 1999-04-09 Porimatec Kk 照光式スイッチ
JP2003068161A (ja) * 2001-08-24 2003-03-07 Nec Kansai Ltd Ｅｌパネル及びｅｌパネル付きキースイッチ
JP2004063449A (ja) * 2002-06-03 2004-02-26 Seiko Precision Inc 照光式スイッチ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008085130A1 (fr) * 2007-01-31 2008-07-17 Sinco Technologies Pte Ltd Ielp (piston el intelligent)

Also Published As

Publication number Publication date
KR20070061756A (ko) 2007-06-14
KR100514759B1 (ko) 2005-09-14

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