U.S. patent application number 09/964538 was filed with the patent office on 2002-02-14 for contact imaging system.
This patent application is currently assigned to Mirae Corporation. Invention is credited to Lee, Ju Hyun, Ryu, Young Kee, Vlaskin, Vladimir.
Application Number | 20020018252 09/964538 |
Document ID | / |
Family ID | 27483281 |
Filed Date | 2002-02-14 |
United States Patent
Application |
20020018252 |
Kind Code |
A1 |
Lee, Ju Hyun ; et
al. |
February 14, 2002 |
Contact imaging system
Abstract
The contact imaging system allows the contact area of an object
impressed upon the surface of the contact imaging system to emit
light in a pattern corresponding to the contact area making it
possible to render an image of the contact area. The contact
imaging system has a luminescence layer on top of a transparent
electrode. When the object to be imaged contacts the luminescence
layer and is held at ground potential relative to the transparent
electrode, an electric field is created in the luminescence layer
in a pattern corresponding to the contact pattern. The electric
field causes the luminescence layer to emit a light image of the
contact pattern. The luminescence layer and the transparent
electrode are adjacent to a light sensing layer. The light sensing
layer receives the light generated at the luminescence layer, and
converts that light into a corresponding electric signal. The light
sensing element or layer can consist of a PN junction diode having
a solar cell structure, a photo transistor, a camera, a scanner, a
position sensitive detector, a charge couple device or a CMOS
sensor. The contact imaging system can also include a stray light
shield which may include a dark pigment to block stay light, and
may also include a water repellent and/or abrasive resistant shield
layer on top of the luminescence layer.
Inventors: |
Lee, Ju Hyun;
(Choongchungnam-do, KR) ; Vlaskin, Vladimir;
(Choongchungnam-do, KR) ; Ryu, Young Kee;
(Choongchungnam-do, KR) |
Correspondence
Address: |
FLESHNER & KIM, LLP
P.O. Box 221200
Chantilly
VA
20153-1200
US
|
Assignee: |
Mirae Corporation
|
Family ID: |
27483281 |
Appl. No.: |
09/964538 |
Filed: |
September 28, 2001 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
09964538 |
Sep 28, 2001 |
|
|
|
09311276 |
May 14, 1999 |
|
|
|
Current U.S.
Class: |
358/483 |
Current CPC
Class: |
G06V 40/1318 20220101;
A61B 5/1172 20130101; G06V 40/13 20220101; H01L 31/165
20130101 |
Class at
Publication: |
358/483 |
International
Class: |
H04N 001/04 |
Foreign Application Data
Date |
Code |
Application Number |
May 15, 1998 |
KR |
1998-17652 |
Jun 23, 1998 |
KR |
1998-23748 |
Sep 7, 1998 |
KR |
1998-36742 |
Dec 23, 1998 |
KR |
1998-57701 |
Claims
1. A contact imaging system, comprising: a light sensing element; a
transparent insulating layer overlaying said light sensing element;
a transparent electrode layer overlaying said transparent
insulating layer; a luminescence layer overlaying said transparent
electrode layer; and a stray light shield layer overlaying said
luminescence layer, wherein the luminescence layer and the
electrode layer are configured such that an electric field can be
applied between an object to be imaged and said transparent
electrode layer.
2. The contact imaging system according to claim 1, further
comprising a transparent adhesive disposed between said light
sensing element and said transparent insulating layer.
3. The contact imaging system according to claim 1, wherein said
light sensing element comprising a PN junction diode.
4. The contact imaging system according to claim 3, wherein said PN
junction diode comprises: a lower electrode; an N-type silicon
layer overlaying said lower electrode; an intrinsic silicon layer
overlaying said N-type silicon layer; a P-type silicon layer
overlaying said intrinsic silicon layer; and, a transparent
electrode overlaying said P-type silicon layer.
5. The contact imaging system according to claim 4, wherein said PN
junction diode is configured to be biased by a reversed direction
voltage.
6. The contact imaging system according to claim 1, wherein said
light sensing element comprises a charge coupled device.
7. The contact imaging system according to claim 1, wherein said
light sensing element comprises a complementary metal oxide
semiconductor (CMOS) image sensor.
8. The contact imaging system according to claim 1, wherein said
light sensing element comprises a photo transistor.
9. The contact imaging system according to claim 1, wherein said
light sensing element comprises a position sensitive detector.
10. The contact imaging system according to claim 1, wherein said
light sensing element comprises a camera.
11. The contact imaging system according to claim 1, wherein said
light sensing element comprises a scanner.
12. The contact imaging system according to claim 1, wherein said
luminescence layer includes a dark pigment that acts to enhance
contrast.
13. The contact imaging system according to claim 12, further
comprising a penetrating control layer formed between said
luminescence layer and said stray light shield layer, wherein said
stray light shield layer includes a dark pigment, and wherein said
penetrating control layer is configured to limit an amount of said
dark pigment that passes from said stray light shield layer to said
luminescence layer.
14. The contact imaging system according to claim 13, wherein said
stray light shield layer comprises: a first layer adjacent the
penetrating control layer that includes said dark pigment; and a
second layer overlying said first layer, wherein said second layer
is configured to block exterior light.
15. The contact imaging system according to claim 1, wherein said
light sensing elements comprises a two dimensional array of light
sensing elements.
16. A contact imaging system, comprising: a light sensing element;
a transparent insulating layer overlaying said light sensing
element; a transparent electrode layer overlaying said transparent
insulating layer; a luminescence layer overlaying said transparent
electrode layer; and a protective layer overlaying said
luminescence layer, wherein said luminescence layer and said
electrode layer are configured such that an electric field can be
applied between an object to be imaged and said transparent
electrode layer.
17. The contact imaging system according to claim 16, wherein said
light sensing element comprises a PN junction diode.
18. The contact imaging system according to claim 17, wherein said
PN junction diode comprises: a lower electrode; an N-type silicon
layer overlaying said lower electrode; an intrinsic silicon layer
overlaying said N-type silicon layer; a P-type silicon layer
overlaying said intrinsic silicon layer; and, a transparent
electrode overlaying said P-type silicon layer.
19. The contact imaging system according to claim 16, wherein said
PN junction diode is configured to be biased by a reversed
direction voltage.
20. The contact imaging system according to claim 16, wherein said
light sensing element comprises a charge coupled device.
21. The contact imaging system according to claim 16, wherein said
light sensing element comprises a complementary oxide semiconductor
image sensor.
22. The contact imaging system according to claim 16, wherein said
light sensing element comprises a photo transistor.
23. The contact imaging system according to claim 16, wherein said
light sensing element comprises a position sensitive detector.
24. The contact imaging system according to claim 16, wherein said
light sensing element comprises a camera.
25. The contact imaging system according to claim 16, wherein said
light sensing element comprises a scanner.
26. The contact imaging system according to claim 16, wherein said
protective layer is hydrophobic.
27. The contact imaging system according to claim 16, wherein said
protective layer is abrasion resistant.
28. The contact imaging system according to claim 16, further
comprising a shield layer disposed between said protective layer
and said luminescence layer, wherein said shield layer is
configured to block exterior light.
29. The contact imaging system comprising: a light sensing element;
a transparent insulating layer overlaying said light sensing
element; a transparent electrode layer overlaying said transparent
insulating layer; and a luminescence layer overlaying said
transparent electrode layer, wherein the electrode layer is
configured such that an electric field can be applied between an
object to be imaged and said transparent electrode layer, and
wherein said electric field causes said luminescence layer to
luminesce when the object to be imaged is brought adjacent to said
luminescence layer.
30. The contact imaging system according to claim 29, further
comprising a transparent adhesive disposed between said light
sensing element and said transparent insulating layer.
31. The contact imaging system according to claim 29, wherein said
light sensing element comprises a PN junction diode.
32. The contact imaging system according to claim 31, wherein said
PN junction diode comprises: a lower electrode; an N-type silicon
layer overlaying said lower electrode; an intrinsic silicon layer
overlaying said N-type silicon layer; a P-type silicon layer
overlaying said intrinsic silicon layer; and, a transparent
electrode overlaying said P-type silicon layer.
33. The contact imaging system according to claim 29, wherein said
light sensing element comprises a charge coupled device.
34. The contact imaging system according to claim 29, wherein said
light sensing element comprises a complementary metal oxide
semiconductor image sensor.
35. The contact imaging system according to claim 29, wherein said
light sensing element comprises a photo transistor.
36. The contact imaging system according to claim 29, wherein said
light sensing element comprises a position sensitive detector.
37. The contact imaging system according to claim 29, wherein said
light sensing element comprises a camera.
38. The contact imaging system according to claim 29, wherein said
light sensing element comprises a scanner.
39. The contact imaging system of claim 29, further comprising: a
shield layer that includes a dark pigment; and a penetrating
control layer located between said shield layer and said
luminescence layer, wherein said penetrating control layer is
configured to limit an amount of the dark pigment in the shield
layer that migrates to the luminescence layer.
40. The contact imaging system of claim 29, further comprising a
protective layer overlaying the shield layer, wherein the
protective layer is abrasion resistant and repels moisture.
Description
BACKGROUND OF THE INVENTION
[0001] This invention relates generally to a contact light emitting
device, a method of manufacturing thereof and a contact input
apparatus using thereof and more particularly, to a contact light
emitting device, the method of manufacturing thereof and the
contact input apparatus using thereof, capable of emitting a photo
image of surface pattern of a contacted object upon contacting the
object which acts as a ground and converting and outputting the
emitted photo image to image signal such as an electrical
image.
[0002] As a prior art, there is "an input apparatus using a
fluorescent material" filed by the present application on May 19,
1997 as the Korea Patent Application No. 19282.
[0003] The input apparatus disclosed in the above application
includes a metal electrode, a PN junction diode, a transparent
conductive layer, an adhesive layer and a fluorescent film on a
substrate formed with glass materials. The fluorescent film is
formed with luminance material and is inputted with a various image
pattern such as letters, figures, straight line, curve, etc., on
the fluorescent film by way of pen or the like.
[0004] The fluorescent film is emitted to an image pattern inputted
by way of a pen and the emitted light is converted from photo
signal to the electrical signal through the PN junction diode. That
is, the input signal is converted and outputted with the electrical
signal after converting the input image pattern to photo
signal.
[0005] However, it is possible to input surface pattern by way of
the input apparatus. In other words, the input apparatus disclosed
in the above application can input information by way of pushing
and moving the pen to the flashing body film but cannot input
information just by pushing the film. The input apparatus disclosed
by the application thus cannot be used for recognition of
fingerprints.
[0006] Accordingly, the present invention is disclosed to solve the
aforementioned problem and it is an object of the present invention
to provide a contact light emitting device by which an image of
contacted area as well as an exact rough surface of contacted area
can be lively expressed and generated in a light emitting image
just by touch or contact to the light emitting apparatus.
SUMMARY OF THE INVENTION
[0007] It is an object of the present invention to provide a
contact light emitting device capable of emitting photo image of
surface pattern of a contacted object upon contacting the object
which acts as a ground and a manufacturing method thereof.
[0008] It is other object of the present invention to provide a
contact input apparatus capable of converting and outputting the
photo images to the image signals such as electrical images.
[0009] Additional objects and advantages of the invention will set
forth in part in the description which follows and in part will be
obvious from the description, or may be learned by practice of the
invention. The objects and advantages of the invention may be
realized and attained by means of the instrumentalities and
combinations particularly pointed out in the appended claims.
[0010] To achieve the objects and in accordance with the purpose of
the invention, as embodied and broadly described herein, the
contact light emitting device of this invention comprises a
transparent electrode layer connected to one of alternating current
power source terminals, luminescence layer for generating photo
image such as surface pattern of contact surface by the electric
field an formed between the transparent electrode layer and a
contacted object which acts as a ground, a transparent insulating
layer for penetrating the photo image and formed under the
transparent electrode.
[0011] According to the present invention, a manufacturing method
of a contact light emitting device of this invention comprising the
steps of: forming a transparent insulating layer by using
transparent insulating materials, forming a transparent electrode
layer by using a transparent conductive material above the
transparent insulating layer, and mixing 25-35 wt. % dielectric
polymer paste, 25-29 wt. % retarder and 30-50 wt. % luminance
powder doped by dopant above the transparent electrode layer and
forming luminescence layer by using the mixed compound.
[0012] A contact input apparatus of this invention comprises a
transparent electrode layer connected to one of alternating current
power source terminals, luminescence layer for generating photo
image such as surface pattern of contact surface by the electric
field and formed between the transparent electrode layer and a
contacted object which acts as a ground, a transparent insulating
layer for penetrating the photo image and formed under the
transparent electrode, and a light receiving means for inverting an
photo image occurred from the luminescence layer to an electrical
signal received through the transparent electrode layer and
transparent insulating layer by attaching the transparent
insulating adhesive material on a lower surface of the transparent
insulating layer.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] These and other object, features, and advantages of the
present invention will become more apparent from the following
description of the preferred embodiments taken in conjunction with
the accompanying drawings, in which:
[0014] FIG. 1 is a sectional view showing a structure of a contact
light emitting device in accordance with the present invention;
[0015] FIG. 2 is a sectional view showing a preferred embodiment of
the contact light emitting device of FIG. 1;
[0016] FIG. 3 is a table showing sample mixed ratios of a
luminescence layer illustrating a FIGS. 1 and 2;
[0017] FIG. 4 is a table showing mixed ratios of polymer paste
illustrated a FIG. 3;
[0018] FIG. 5 is a table showing sample mixed ratios of a
penetrating control layer illustrated at FIG. 2;
[0019] FIG. 6 is a table showing sample mixed ratios for
manufacturing a shield layer illustrated a FIG. 2;
[0020] FIG. 7 is a table showing sample mixed ratios for
manufacturing a water repellent layer illustrated at FIG. 2;
[0021] FIG. 8 is a sectional view of a structure of contact input
apparatus using contact light emitting device in accordance with
the present invention; and
[0022] FIG. 9 is a sectional view showing a preferred embodiment of
the contact input apparatus using contact light emitting device in
accordance with the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0023] The embodiments of a contact light emitting device according
to present invention will now be described in detail based on the
drawings.
[0024] FIG. 1 is a sectional view showing a structure of a contact
light emitting device in accordance with the present invention. The
contact light emitting device of this invention comprises a
transparent electrode layer 2 connected to one of alternating
current power source terminals, a luminescence layer 3 for
generating photo-image such as surface pattern of contact surface
10a by the electric field and formed between the transparent
electrode layer 2 and a contacted object 10 upon contacting the
object 10 which acts as a ground, and a transparent insulating
layer 1 for penetrating the photo-image and formed under the
transparent electrode 2.
[0025] In the FIG. 1, the transparent electrode layer 2 is formed
on the transparent insulating layer 1 consisting of a transparent
polymer. The transparent electrode layer 2 is formed with ITO
(Indium Tin Oxide) and is connected to one of alternating current
power source terminals. Also, a luminescence layer 3 is formed on
the transparent electrode layer 2 to be connected to one of the
alternating current power source terminals. The luminescence layer
3 is formed with luminance powder doped with dopant and dielectric
polymer.
[0026] The luminance powder is formed with at least one among two
elementary compound groups consisting of ZnS, SrS, and ZnO. The
dopant doped at the luminance powder is selected and mixed with at
least one among dopant groups consisting of Mn, Cu, Cl, Al, I, Tb,
and F.
[0027] The luminescence layer 3 is formed by adding a black pigment
as an inorganic material for increasing contrast of photo image and
is also formed by adding BaTiO.sub.3 or other dielectric powders
for increasing brightness thereof.
[0028] The black pigment contained within the luminescence layer 3
is generally existed at non-luminescence portion formed between a
luminance powders. In case of emitting the luminance powder, the
non-luminescence portion is changed to the darker state than before
and maintained with said state to predetermined minutes by adding
the black pigment. Therefore, the luminescence layer 3 can be made
with high visual contrast of the photo image by providing a clear
boundary between the luminance portion and the non-luminance
portion.
[0029] An alternating current power source having 50-300V voltage
and 1K-3 MHz frequency is provided for the transparent electrode
layer 2 for the purpose of activating the luminescence layer 3 with
color and brightness which is determined by the dopant, the black
pigment or BaTiO.sub.3. The transparent electrode layer 2 is
connected one of the alternating current power source
terminals.
[0030] When the luminescence layer 3 is contacted by the object
which acts as a ground, an electric field is formed between the
object 10 and the transparent electrode layer 2 and a close circuit
upon contacting the object 10 to thereby emit the light.
[0031] That is, transparent electrode layer 2, luminescence layer 3
and the object 10 are formed with a close circuit upon contacting
the object 10 which acts as a ground, and thus the electric field
is formed at both ends of the luminescence layer 3.
[0032] When the luminescence layer 3 is activated by the electric
field, a surface pattern of a contact surface 10a of the object 10
is generated with the photo image. Also, the photo image is
generated with wavelength corresponding to visual light region. The
photo image is entered into a downwardly direction through the
transparent electrode layer 2 and the transparent insulating layer
1, and a transmitted photo image is used with various usage after
processing with an image signal.
[0033] Also, the luminescence layer 3 for generating the photo
image is formed by adding a dielectric layer (not shown) at one of
an upper or a lower surface thereof. The dielectric layer is able
to increase a capacitance of the contact light emitting device and
thus the brightness is increased in proportion to an increment of
the capacitance. The dielectric layer for increasing the luminance
brightness is formed with one or multiple in order to insulate and
shield alternating current power source.
[0034] FIG. 2 is a sectional view showing an embodiment of the
contact light emitting device illustrated at FIG. 1. As shown in
FIG. 2, a penetrating control layer 4, a shield layer 5 and water
repellent layer 6 are gradually laminated on the luminescence layer
3.
[0035] The penetrating control layer 4 is formed between the
luminance layer 3 and the shield layer 5 for controlling exactly an
amount of a penetrated black pigment to the luminance layer 3. The
penetrating control layer 4 is made of a dielectric polymer and
BaTiO.sub.3 so as to obtain a high dielectric ratio.
[0036] The penetrating control layer 4 is formed with a
predetermined thickness in order to control the amount of the black
pigment included at the shield layer 5. Also, the penetrating
control layer 4 is acted as a dielectric layer by a dielectric
polymer and BaTiO.sub.3 powder. A shield layer 5 is formed between
the penetrating control layer 4 and the water repellent layer
6.
[0037] The shield layer 5 is divided into a first shield layer 5a
and second shield layer 5b for penetrating and forming a
predetermined amount of black pigment to the luminescence layer 3
through the penetrating control layer 4 from the shield layer
5.
[0038] The second layer 5b is prevented from emitting the light
existed at an outside of the contact emitting layer.
[0039] A water repellent layer 6 which includes an abrasive and a
hydrophobic characteristics having a repulsive force to the water,
is formed on the shield layer 5.
[0040] When the object 10 is contacted with the water repellent
layer 6, the electric field is formed between the contacted object
10 and the transparent electrode layer 2 and thus generating the
photo image by the electric field. The photo image is entered with
downward direct ion through the transparent electrode layer 2 and
the transparent insulating layer 1 and the entered photo image is
used as various ways according to the contacted object 10.
[0041] Next, a manufacturing method of the contact light emitting
device is described in more detail with reference to the
accompanying drawing. The manufacturing method of the contact light
emitting device is manufactured by using a thick or a thin film
processes, respectively.
[0042] First, the manufacturing method of the contact light
emitting device manufactured by using the thick film is described
as follows.
[0043] The manufacturing of the contact light emitting device of
the present invention comprising the steps of forming the
transparent insulating layer by using transparent insulating
materials, forming the transparent electrode layer 2 by using a
transparent conductive material above the transparent insulating
layer 1, and mixing 25-35 wt. % dielectric polymer paste, 25-29 wt.
% retarder and 30-50 wt. % luminance powder doped by dopant above
the transparent electrode layer 2 and forming a luminescence layer
by using the mixed compound.
[0044] The transparent insulating layer 1 is formed with a
transparent insulating material containing a glass or a transparent
polymer. The transparent insulating layer 1 is used as a substrate
upon manufacturing the contact light emitting device and is
gradually laminated and formed with the transparent electrode layer
2 and the luminescence layer 3 on the transparent insulating layer
1.
[0045] The transparent electrode layer 2 formed on the transparent
insulating layer 1, is formed with a predetermined thickness by
using a transparent conductive material as a paste type. The
transparent conductive material for forming the transparent
electrode layer 2, is formed by mixing an ITO (indium tin oxide)
powder and a polymer.
[0046] After forming the transparent electrode layer 2, the
luminescence layer 3 is formed on the transparent electrode layer
2. As illustrated in FIG. 3, the luminescence layer 3 is formed
with 25-35 wt. % dielectric polymer paste, 25-29 wt. % retarder,
30-50 wt. % luminance powder doped by dopant on a transparent
electrode layer 2 and forming a luminescence layer 3 busing the
mixed compound.
[0047] The luminance powder containing at the luminescence layer 3,
is formed with at least one of to elementary compound groups
consisting of ZnS, SrS and ZnO (for example, one of II-IV family
compound groups). Also, the dopant doped at the luminance powder is
formed with at least one of dopant groups consisting of Mn, Cu, Cl,
Al, I, Tb, and F in order to control brightness and color
thereof.
[0048] The dopant can be able to determine a luminance color of the
luminescence layer 3. The luminescence color of the luminescence
layer 3 is differently generated according to the dopant.
Combinations of two elementary compound groups and the dopants
include ZnS+Cu, Mn, Cl; ZnS+Cu; ZnS+Cu,I; ZnS+Cu,Cl; ZnS+Cu,Al.
[0049] A binder to be used as luminance powder doped by the dopant,
is dielectric polymer paste. As illustrated in FIG. 4, the
dielectric polymer paste is mixed and formed with 30 wt % Poly
(vinylbutyral-co-vinyl alcohol-co-vinyl acetate) and 70 wt %
ethyllene glycol mono-ethyl ether acetate. Also, it is formed by
adding a retarder at the luminance powder. The retarder is formed
with 20-60 .mu.m thickness on the transparent electrode layer 2 for
preventing solidification of the luminescence layer 3 during screen
printing process.
[0050] A dielectric layer (not shown) is added and formed on upper
or lower surfaces of the luminescence layer 3 after forming the
luminescence layer 3 above the transparent electrode layer 2. The
dielectric layer is added and formed on one of the upper surface,
the lower surface and both surfaces of the luminescence layer 3
after manufacturing the dielectric material as a paste type. The
dielectric layer is formed as one or multiple layers.
[0051] As illustrated in FIG. 2, penetrating control layer 4,
shield layer 5 and water repellent layer 6 are formed on the
luminescence layer 3 for obtaining high brightness and having an
abrasive or durability characteristics.
[0052] The dielectric polymer paste having a predetermined
thickness is formed on the luminescence layer 3 before forming the
penetrating control layer 4 on the luminescence layer 3. The
polymer paste penetrates the luminescence layer 3 and coats the
surface of the luminance powder to be formed the luminescence layer
3. The surface of the luminance powder is coated by the polymer so
that the bulk of light occurred from the luminescence layer 3
cannot be dispersed to a distance. The light is remained by the
polymer film coated at the surface of the luminance powder so that
a good photo image can be obtained upon generating photo image.
[0053] Small quantities of black pigment and BaTiO.sub.3 powder
having molecular size not exceeding 1 .mu.m, are added at the
luminescence layer 3. The BaTiO.sub.3 powder increases a dielectric
ratio and the black pigment is to increase a non-luminance portion
between the luminance portions and thus increasing the contrast of
the photo image.
[0054] After finishing the coating process for covering the surface
of tile luminance power, it is dried at a dry oven (not shown in
order to volatilize and solidify the retarder. When the dry process
is finished, the luminescence layer 3 is heated and pressurized
under 100-200.degree. C. and thus increasing a fineness of a
membrane. After finishing the coating and drying processes, a
penetrating control layer 4 is added and formed.
[0055] The penetrating control layer 4 is formed for controlling an
amount of the black pigment at the process which penetrates the
black pigment contained at a shield layer 5 to the luminescence
layer 3.
[0056] As illustrated in FIG. 5, the mixing ratio of penetrating
control layer 4 is formed with 11-26 wt. % of polymer paste, 11-22
wt. % of retarder, 15-26 wt. % of plastic material and 26-63 wt. %
of BaTiO.sub.3 powder whose molecular size dose not exceed 1 .mu.m.
One of N-ethyl-P-toluenesulfonamide, dimethylformamide,
dimethylphthalate for forming the luminescence layer 3 and the
penetration control layer 4 is selected and added to as the plastic
material.
[0057] The penetrating control layer 4 having a thickness of
approximately 5 .mu.m is easily penetrated by the pigment contained
at the shield layer 5 to the luminescence layer 3. In case of using
the N-ethyl-P-toluenesulfonamide, the penetrating control layer 4
having high dielectric ratio is formed and is increased to the
fineness of the membrane after heating and pressurizing under
100-200.degree. C.
[0058] After forming the penetrating control layer 4, the shield
layer 5 is formed above the penetrating control layer 4. If the
penetrating control layer 4 is not formed, the shield layer 5 is
directly formed on the luminescence layer 3.
[0059] As illustrated in FIG. 6, the shield layer 5 is mixed and
formed with 1-5 wt. % black pigment, 5-30 wt. % polyurethane, 15-23
wt. % ethyllene glycol monoethyl ether acetate, 50-71 wt. % xylene
and BaTiO.sub.3 powder whose molecular size does not exceeding 1
.mu.m. The BaTiO.sub.3 powder has more high dielectric ratio than
the shield layer 5.
[0060] The shield layer 5 whose thickness does not exceeding 10
.mu.m is formed. The shield layer 5 includes a first shield layer
5a penetrating and forming a predetermined amount of black pigment
to the luminescence layer 3 wherein the first shield layer 5a has a
lower viscosity than a second shield layer 5b, and a second shield
layer 5b for shielding an cuter light and formed above the first
shield layer 5a. In the first shield layer 5a, the black pigment is
penetrated and moved to the luminescence layer 3 through the
penetrating control layer 4.
[0061] After forming the first shield layer 5a, the second shield
layer 5b is formed. The black pigment contained at the second
shield layer 5b is not to penetrate a light existed at an outer of
the contact light emitting device into the luminescence layer 3.
After forming the first shield layer 5a and the second shield layer
5b in regular sequence, the first and second shield layers 5a, 5b
are increased to the fineness of the membrane by heating and
pressurizing under 100-200.degree. C. after polymerizing the first
and second shield layers 5a, 5b at a dry oven.
[0062] A water repellent layer 6 whose thickness does not exceeding
5 .mu.m is formed above the shield layer 5 constructed as the first
shield layer 5a and the second shield layer 5b. The water repellent
layer 6 is formed with a strong water repellent upon contacting one
of a water, a moisture and an object and is also formed with a good
internal abrasion for preventing an abrasion upon contacting the
object.
[0063] As illustrated in FIG. 7, the water repellent layer 6 is
mixed and formed with 6-35 wt. % polyurethane, 15-23 wt. % ethylene
glycol mono ethyl ether acetate, 50-71 wt. % xylene and BaTiO.sub.3
on the shield layer and forming a water repellent layer.
[0064] Upon forming the penetrating control layer 4, the
polyurethane can be replaced with a poly(vinyl butyral-co-vinyl
alcohol-co-vinyl acetate).
[0065] The above mentioned method is a manufacturing method of the
contact light emitting device using a thick film to be formed by
using a screen printing method or a spin coating method.
[0066] A plain degree of the membrane of the spin coating method is
improved rather than that of the screen printing method. The
contact light emitting device of the present invention is also
manufactured by using thin film.
[0067] Each of materials of the layers for forming the contact
light emitting device is formed with solidification. That is, each
of the layers is formed with sputtering target or solidification in
order to manufacture the contact light emitting device with thin
film.
[0068] As illustrated in FIG. 1, the transparent electrode layer 2
having 0.05-0.1 .mu.m thickness is formed after sputtering the ITO
manufactured by the sputtering target on the transparent insulating
layer 1. After forming the transparent electrode layer 2, the
luminescence layer 3 having 0.5-1.0 .mu.m thickness is formed by
sputtering the sputtering target for forming the luminescence layer
3 on the transparent electrode layer 2.
[0069] The mixing example of the target for forming the
luminescence layer 3 is formed with ZnS+Mn, Cl; ZnS+Tb, F; SrS+Ce,
etc. A concentration of the dopant to be doped at the luminance
powder manufactured by the sputtering method is 0.1-2.5 atomic
%.
[0070] A dielectric layer (not shown) formed at least one surface
of the luminescence layer 3 is used as a target with a high
dielectric material. The dielectric layer having 0.3-0.5 .mu.m
thickness is formed by sputtering as a target with the high
dielectric material on the transparent electrode layer 2 or the
luminescence layer 3. After forming the shield layer 5 and the
water repellent layer 6 by using the sputtering target, the shield
layer 5 and the water repellent layer 5 are formed with sputtering
order, respectively. Also, the contact light emitting device is
also manufactured by an evaporation method after forming material
of each layer with solidification in replace of the sputtering
method.
[0071] Now, a contact input apparatus for converting and outputting
the photo image occurred at the contact light emitting device
manufactured by using thick film or thin film methods to the image
signal such as an electrical signal will be described in more
detail with reference to accompanying drawings.
[0072] FIG. 8 is a sectional view, for illustrating the structure
of the contact input apparatus using the contact light emitting
device of the present invention and FIG. 9 is a sectional view
shown an embodiment of the contact input apparatus using the
contact light emitting device of the present invention. As shown in
FIGS. 8 and 9, when the object 10 is contacted with the transparent
electrode layer 2 connected to one of alternating, current power
source terminals, the electric field is formed between the
transparent electrode layer 2 connected to one of alternating
current power terminals and the contacted object 10.
[0073] The contact input apparatus including the transparent
electrode layer 2 connected to one of alternating current power
source terminals, luminescence layer 3 for generating photo-image
such as surface pattern of contact surface by electric field and
formed between the transparent electrode layer 2 and a contacted
object 10 which acts as a ground, a transparent insulating layer 1
for penetrating the photo-image and formed under the transparent
electrode layer 2, and a light receiving element 9 for inverting an
photo-image occurred from the luminescence layer 3 to an electrical
signal received through the transparent electrode layer 2 and the
transparent insulating layer 1 by attaching the transparent
insulating adhesive material 7 on a lower surface of the
transparent insulating layer 1.
[0074] Referring to FIG. 1, the contact input apparatus is
constructed with the transparent insulating layer 1, the
transparent electrode layer 2 and luminescence layer 3. Also, the
penetrating control layer 4, the shield layer 5 and the water
repellent layer 6 are formed on the luminescence layer 4 as shown
in FIG. 2. A contact input apparatus can be constructed with a
constructing element of the contact light emitting device shown in
FIGS. 1 and 2 and the light receiving element 9 as the transparent
insulating adhesive material 7.
[0075] The contact input apparatus is formed by attaching the
transparent insulating of the contact light emitting device and by
using transparent insulating adhesive material 7 to the light
receiving element 9 formed on a substrate 8. The light receiving
element 9 formed on the substrate 8 is a PN junction diode.
[0076] For converting the received photo-image to the electrical
signal, the PN junction diode is formed with a solar cell structure
and regularly laminated to a lower electrode layer 9a formed with a
conductive metal on the substrate 8, N-type amorphous silicon layer
9b, an intrinsic amorphous silicon layer 9c, P-type amorphous
silicon layer 9d and an upper transparent electrode layer 9e,
respectively.
[0077] The electric field is formed by applying a predetermined
reversed direction voltage to the PN junction diode. A pair of
electron holes which generates in the PN junction diode, is
separated by the received photo-image and the electric signal
according to the separated photo-image is occurred. The photo-image
is received at P-type amorphous silicon layer 9d so that intrinsic
amorphous silicon layer 9c such as depletion layer is also
occurred. Since the pair of electron holes is separated by the
electric field, the holes are moved to the upper transparent
electrode layer 9e through the P-type amorphous silicon layer 9d
and electron is moved to the lower electrode layer 9a through the
N-type amorphous silicon layer 9b and an electric signal according
to the photo-image is occurred.
[0078] The light receiving element is formed with two dimensional
array for receiving the photo-image occurred at the contact light
emitting device. In the light receiving element having the two
dimensional array, an array number of the light receiving element
is determined by an analysis is performance of the contacted object
10 and a resolution of the contacted surface 10a of the object 10
is differently formed to the array number of the light receiving
element. The light receiving element such as PN junction diode can
be replaced with CCD(Charge Coupled Device) sensor or
CMOS(Complementary Metal Oxide Semiconductor) image sensor.
[0079] A photo-image generated at the contact light emitting device
formed by using the luminance powder consisted with two elementary
compound groups is converted to the electric signal by the light
receiving element. Thus, a pattern of a contact surface of the
object is converted to an image signal.
[0080] When an object (for example, a fingerprint formed at a
finger of the human) is loaded on the contact surface of the
contact light emitting device, a concave and convex pattern formed
at the contacted object is automatically extracted from photo-image
and converted into an image signal. According to the present
invention, the clear surface pattern of a contacted object can be
obtained by generating the photo-image such as a pattern of the
object which acts as a ground and converting the photo-image to an
image signal such as an electric signal. Thus, the present
invention can be applied to a fingerprint identification system,
which compares the difference between a stored fingerprint data and
a detected fingerprint. Also, the present invention enables a
reduced manufacturing cost by using a screen printing method.
[0081] The invention is in no way limited to the embodiment
described hereinabove. Various modifications of the disclosed
embodiment as well as other embodiments of the invention will
become apparent to persons skilled in the art upon reference to the
description of the invention. It is therefore contemplated that the
appended claims will cover any such modifications or embodiments as
fall within the true scope of the invention.
* * * * *