U.S. patent application number 17/016568 was filed with the patent office on 2022-03-10 for three-dimensional sensing panel and method of manufacturing the same and electronic apparatus.
The applicant listed for this patent is TPK Advanced Solutions Inc.. Invention is credited to Yuting Chan, Tai Shih Cheng, Lien Hsin Lee, Chu Chiang Lin, Jenchang Liu, Ren Hung Wang, Yan Zhao, Jun Chen Zhong.
Application Number | 20220075468 17/016568 |
Document ID | / |
Family ID | |
Filed Date | 2022-03-10 |
United States Patent
Application |
20220075468 |
Kind Code |
A1 |
Lee; Lien Hsin ; et
al. |
March 10, 2022 |
THREE-DIMENSIONAL SENSING PANEL AND METHOD OF MANUFACTURING THE
SAME AND ELECTRONIC APPARATUS
Abstract
A three-dimensional sensing panel includes a cover plate, a
two-dimensional touch sensing module, a pressure sensing coating
layer, and a light-transmitting electrode layer. The cover plate
defines thereon a touch area and a peripheral area surrounding the
touch area. The two-dimensional touch sensing module is disposed at
the touch area. The pressure sensing coating layer is coated at a
side of the two-dimensional touch sensing module away from the
cover plate. The light-transmitting electrode layer is coated at a
side of the pressure sensing coating layer away from the
two-dimensional touch sensing module.
Inventors: |
Lee; Lien Hsin; (Taipei
City, TW) ; Zhao; Yan; (Xiamen, CN) ; Liu;
Jenchang; (Tainan City, TW) ; Wang; Ren Hung;
(Taichung City, TW) ; Cheng; Tai Shih; (Taipei
City, TW) ; Zhong; Jun Chen; (Longyan City, CN)
; Chan; Yuting; (Taoyuan City, TW) ; Lin; Chu
Chiang; (Taoyuan City, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
TPK Advanced Solutions Inc. |
Xiamen |
|
CN |
|
|
Appl. No.: |
17/016568 |
Filed: |
September 10, 2020 |
International
Class: |
G06F 3/041 20060101
G06F003/041 |
Claims
1. A three-dimensional sensing panel, comprising: a cover plate
defining thereon a touch area and a peripheral area surrounding the
touch area; a two-dimensional touch sensing module disposed at the
touch area; a pressure sensing coating layer disposed and in
contact with a side of the two-dimensional touch sensing module
away from the cover plate; and a light-transmitting electrode layer
disposed and in contact with a side of the pressure sensing coating
layer away from the two-dimensional touch sensing module, wherein a
value of a* axis of CIELAB color space of the three-dimensional
sensing panel is in a range from about -1.5 to about 1.5.
2. The three-dimensional sensing panel of claim 1, wherein a
material of the pressure sensing coating layer comprises
polyvinylidene difluoride (PVDF).
3. The three-dimensional sensing panel of claim 1, wherein a
thickness of the pressure sensing coating layer is in a range from
about 7 .mu.m to about 10 .mu.m.
4. The three-dimensional sensing panel of claim 1, wherein the
two-dimensional touch sensing module is a one glass solution
single-sided indium tin oxide (OGS-SITO) type touch module.
5. The three-dimensional sensing panel of claim 1, wherein the
light-transmitting electrode layer is a silver nanowire electrode
layer.
6. The three-dimensional sensing panel of claim 1, wherein a value
of L* axis of CIELAB color space of the three-dimensional sensing
panel is equal to or greater than 92.
7. (canceled)
8. The three-dimensional sensing panel of claim 1, wherein a value
of b* axis of CIELAB color space of the three-dimensional sensing
panel is in a range from about -2 to about 2.
9. The three-dimensional sensing panel of claim 1, wherein the
pressure sensing coating layer comprises a plurality of pressure
sensing blocks spaced apart from each other.
10. The three-dimensional sensing panel of claim 9, wherein the
light-transmitting electrode layer comprises a plurality of
electrode blocks spaced apart from each other and respectively
contacting the pressure sensing blocks.
11. (canceled)
12. A method of manufacturing a three-dimensional sensing panel,
comprising: disposing a two-dimensional touch sensing module on a
cover plate; coating a polymer coating layer on a side of the
two-dimensional touch sensing module away from the cover plate;
drying the polymer coating layer to form a dried polymer coating
layer; coating a light-transmitting electrode layer on a side of
the dried polymer coating layer away from the two-dimensional touch
sensing module; and poling the dried polymer coating layer to
transform the dried polymer coating layer into a pressure sensing
coating layer.
13. The method of claim 12, wherein the coating the
light-transmitting electrode layer is performed before the poling
the dried polymer coating layer.
14. The method of claim 12, wherein the coating the
light-transmitting electrode layer is performed after the poling
the dried polymer coating layer.
15. The three-dimensional sensing panel of claim 1, wherein the
two-dimensional touch sensing module comprises a first touch
sensing electrode layer and a second touch sensing electrode layer,
the second touch sensing electrode layer is disposed at a side of
the first touch sensing electrode layer away from the cover plate,
and the pressure sensing coating layer is disposed and in contact
with a side of the second touch sensing electrode layer away from
the cover plate.
16. A three-dimensional sensing panel, comprising: a cover plate
defining thereon a touch area and a peripheral area surrounding the
touch area; a two-dimensional touch sensing module disposed at the
touch area; a pressure sensing coating layer disposed and in
contact with a side of the two-dimensional touch sensing module
away from the cover plate; and a light-transmitting electrode layer
disposed and in contact with a side of the pressure sensing coating
layer away from the two-dimensional touch sensing module, wherein a
value of b* axis of CIELAB color space of the three-dimensional
sensing panel is in a range from about -2 to about 2.
17. The three-dimensional sensing panel of claim 16, wherein a
value of L* axis of CIELAB color space of the three-dimensional
sensing panel is equal to or greater than 92.
18. The three-dimensional sensing panel of claim 16, wherein the
pressure sensing coating layer comprises a plurality of pressure
sensing blocks spaced apart from each other.
19. The three-dimensional sensing panel of claim 18, wherein the
light-transmitting electrode layer comprises a plurality of
electrode blocks spaced apart from each other and respectively
contacting the pressure sensing blocks.
20. The three-dimensional sensing panel of claim 16, wherein the
two-dimensional touch sensing module comprises a first touch
sensing electrode layer and a second touch sensing electrode layer,
the second touch sensing electrode layer is disposed at a side of
the first touch sensing electrode layer away from the cover plate,
and the pressure sensing coating layer is disposed and in contact
with a side of the second touch sensing electrode layer away from
the cover plate.
21. The three-dimensional sensing panel of claim 16, wherein a
material of the pressure sensing coating layer comprises
polyvinylidene difluoride (PVDF).
22. The three-dimensional sensing panel of claim 16, wherein a
thickness of the pressure sensing coating layer is in a range from
about 7 .mu.m to about 10 .mu.m.
23. The three-dimensional sensing panel of claim 16, wherein the
two-dimensional touch sensing module is a one glass solution
single-sided indium tin oxide (OGS-SITO) type touch module.
Description
BACKGROUND
Technical Field
[0001] The present disclosure relates to a three-dimensional
sensing panel and a method of manufacturing the same and an
electronic apparatus.
Description of Related Art
[0002] With the diversified development of touch modules, touch
modules have been maturely applied to industrial electronics and
consumer electronics products. Demand has progressed from
determining the two-dimensional position (e.g., the X-axis
direction and the Y-axis direction) of the touch point on the
surface of the screen to also sensing the force parameter caused by
the change of the force applied to the surface of the screen (e.g.,
the Z-axis direction). Even the application requirements for
flexible panels will be inevitable.
[0003] However, in a conventional three-dimensional touch-pressure
integrated panel, the pressure sensor is usually mounted above or
below a two-dimensional touch panel. This manufacturing method not
only cannot integrate with the conventional manufacturing
processes, but also requires the use of additional adhesive
(optically clear adhesive (OCA)). Furthermore, in the design of
this kind of out-cell touch-pressure integrated panel, in addition
to the cover plate, an additional transparent film is needed to
cover the pressure sensor for protection. Therefore, an additional
manufacturing process is required and additional costs are
incurred.
[0004] Accordingly, how to provide a three-dimensional sensing
panel to solve the aforementioned problems has become an important
issue to be solved by those in the industry.
SUMMARY
[0005] An aspect of the disclosure is to provide a
three-dimensional sensing panel that can efficiently solve the
aforementioned problems.
[0006] According to an embodiment of the disclosure, a
three-dimensional sensing panel includes a cover plate, a
two-dimensional touch sensing module, a pressure sensing coating
layer, and a light-transmitting electrode layer. The cover plate
defines thereon a touch area and a peripheral area surrounding the
touch area. The two-dimensional touch sensing module is disposed at
the touch area. The pressure sensing coating layer is coated at a
side of the two-dimensional touch sensing module away from the
cover plate. The light-transmitting electrode layer is coated at a
side of the pressure sensing coating layer away from the
two-dimensional touch sensing module.
[0007] In an embodiment of the disclosure, a material of the
pressure sensing coating layer includes polyvinylidene difluoride
(PVDF).
[0008] In an embodiment of the disclosure, a thickness of the
pressure sensing coating layer is in a range from about 7 .mu.m to
about 10 .mu.m.
[0009] In an embodiment of the disclosure, the two-dimensional
touch sensing module is a one glass solution single-sided indium
tin oxide (OGS-SITO) type touch module.
[0010] In an embodiment of the disclosure, the light-transmitting
electrode layer is a silver nanowire electrode layer.
[0011] In an embodiment of the disclosure, a value of L* axis of
CIELAB color space of the three-dimensional sensing panel is equal
to or greater than 92.
[0012] In an embodiment of the disclosure, a value of a* axis of
CIELAB color space of the three-dimensional sensing panel is in a
range from about -1.5 to about 1.5.
[0013] In an embodiment of the disclosure, a value of b* axis of
CIELAB color space of the three-dimensional sensing panel is in a
range from about -2 to about 2.
[0014] In an embodiment of the disclosure, the pressure sensing
coating layer includes a plurality of pressure sensing blocks. The
pressure sensing blocks are spaced apart from each other.
[0015] In an embodiment of the disclosure, the light-transmitting
electrode layer includes a plurality of electrode blocks. The
electrode blocks are spaced apart from each other and respectively
contact the pressure sensing blocks.
[0016] According to an embodiment of the disclosure, an electronic
apparatus includes the aforementioned three-dimensional sensing
panel and a display module. The display module is disposed at a
side of the light-transmitting electrode layer away from the
pressure sensing coating layer.
[0017] According to an embodiment of the disclosure, a method of
manufacturing a three-dimensional sensing panel includes: disposing
a two-dimensional touch sensing module on a cover plate; coating a
polymer coating layer on a side of the two-dimensional touch
sensing module away from the cover plate; drying the polymer
coating layer to form a dried polymer coating layer; coating a
light-transmitting electrode layer on a side of the dried polymer
coating layer away from the two-dimensional touch sensing module;
and poling the dried polymer coating layer to transform the dried
polymer coating layer into a pressure sensing coating layer.
[0018] In an embodiment of the disclosure, the coating the
light-transmitting electrode layer is performed before the poling
the dried polymer coating layer.
[0019] In an embodiment of the disclosure, the coating the
light-transmitting electrode layer is performed after the poling
the dried polymer coating layer.
[0020] Accordingly, in the three-dimensional sensing panel of the
present disclosure, the two-dimensional touch sensing module adopts
the OGS architecture, and the pressure sensing coating layer and
the light-transmitting electrode layer are sequentially formed on
the two-dimensional touch sensing module by coating processes.
Therefore, the use of adhesive can be omitted, which can
effectively reduce the overall thickness and manufacturing cost. In
addition, the two-dimensional touch sensing module using the OGS
architecture also has a smaller thickness than a two-dimensional
touch sensing module using the GFF architecture (that is, the OGS
architecture uses a dielectric layer as a bridge to concentrate the
touch sensing electrode layer to a thickness of a single layer,
while eliminating the thickness of using adhesive to stack a
multi-layer structure of the GFF architecture and the resulting
reduction in force transmission rate), which can provide excellent
signal conduction characteristics and is conducive to the
efficiency of extracting power signals.
[0021] It is to be understood that both the foregoing general
description and the following detailed description are by examples,
and are intended to provide further explanation of the disclosure
as claimed.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The disclosure can be more fully understood by reading the
following detailed description of the embodiment, with reference
made to the accompanying drawings as follows:
[0023] FIG. 1 is a schematic diagram of an electronic apparatus
according to an embodiment of the disclosure;
[0024] FIG. 1A is a top view of a two-dimensional touch sensing
module in FIG. 1;
[0025] FIG. 2 is a top view of a pressure sensing coating layer
according to an embodiment of the disclosure;
[0026] FIG. 3 is a force vs. strength of force signal graph of
three-dimensional sensing panels respectively using a one glass
solution (OGS) type touch sensing module and a glass-film-film
(GFF) type touch sensing module; and
[0027] FIG. 4 is a flowchart of a method of manufacturing a
three-dimensional sensing panel according to an embodiment of the
disclosure.
DETAILED DESCRIPTION
[0028] Reference will now be made in detail to the present
embodiments of the disclosure, examples of which are illustrated in
the accompanying drawings. Wherever possible, the same reference
numbers are used in the drawings and the description to refer to
the same or like parts. However, specific structural and functional
details disclosed herein are merely representative for purposes of
describing example embodiments, and thus may be embodied in many
alternate forms and should not be construed as limited to only
example embodiments set forth herein. Therefore, it should be
understood that there is no intent to limit example embodiments to
the particular forms disclosed, but on the contrary, example
embodiments are to cover all modifications, equivalents, and
alternatives falling within the scope of the disclosure.
[0029] Reference is made to FIG. 1. FIG. 1 is a schematic diagram
of an electronic apparatus 100 according to an embodiment of the
disclosure. As shown in FIG. 1, the electronic apparatus 100 of the
present embodiment is a touch display device as an example and
includes a three-dimensional sensing panel and a display module
190. The display module 190 is disposed under the three-dimensional
sensing panel.
[0030] Specifically, the three-dimensional sensing panel includes a
cover plate 110, a shielding layer 120, an optical matching layer
130, and a plurality of traces 150 (only one is shown in FIG. 1).
The cover plate 110 defines thereon a touch area 111 and a
peripheral area 112 surrounding the touch area 111. The shielding
layer 120 is disposed in the peripheral area 112 of the cover plate
110. The optical matching layer 130 is disposed on the cover plate
110 and covers the shielding layer 120, so as to provide a flat
upper surface in the touch area 111. The traces 150 are disposed on
the optical matching layer 130 and located in the peripheral area
112. Hence, when viewed from the bottom surface of the cover plate
110, the shielding layer 120 can shield the traces 150 from the
viewer.
[0031] In some embodiments, a material of the cover plate 110
includes glass, but the disclosure is not limited in this
regard.
[0032] Reference is made to FIG. 1A. FIG. 1A is a top view of a
two-dimensional touch sensing module 140 in FIG. 1. As shown in
FIGS. 1 and 1A, the three-dimensional sensing panel further
includes the two-dimensional touch sensing module 140. The
two-dimensional touch sensing module 140 is disposed at the touch
area 111 and includes a first touch sensing electrode layer 141, a
dielectric layer 142, and a second touch sensing electrode layer
143. The first touch sensing electrode layer 141 is disposed on the
optical matching layer 130 and includes a plurality of first-axis
conductive units 141a which are spaced apart from each other in the
touch area 111 (as shown in FIG. 1A). The second touch sensing
electrode layer 143 is disposed on the optical matching layer 130
and includes a plurality of second-axis conductive units 143a which
are spaced apart from each other in the touch area 111 and cross
the first-axis conductive units 141a. More specifically, the
first-axis conductive units 141a may be a plurality of diamond
electrodes connected in series to form a first-axis conductive
channel (as shown in FIG. 1A), but the shape of the electrodes is
not limited in this regard and can be other electrode shapes. A
plurality of the first-axis conductive channels form the first
touch sensing electrode layer 141. Similarly, the second-axis
conductive units 143a may be a plurality of diamond-shaped
electrodes connected in series to form a second-axis conductive
channel (as shown in FIG. 1A), but the shape of the electrodes is
not limited in this regard and can be other electrode shapes. A
plurality of the second-axis conductive channels form the second
touch sensing electrode layer 143.
[0033] The dielectric layer 142 covers the first-axis conductive
units 141a to electrically isolate the first-axis conductive units
141a from the second-axis conductive units 143a. Hence, the touch
signal (such as a mutual capacitance sensing signal) between the
first touch sensing electrode layer 141 and the second touch
sensing electrode layer 143 can be extracted through the traces
150.
[0034] Specifically, the aforementioned "first-axis" and
"second-axis" are, for example, two mutually perpendicular axes
(e.g., X axis and Y axis). In other words, the first-axis
conductive units 141a (and the first-axis conductive channels) are
conductive lines extending along the first axis and can be arranged
at intervals along the second axis. The second-axis conductive
units 143a (and second-axis conductive channels) are conductive
lines extending along the second axis and can be arranged at
intervals along the first axis.
[0035] In addition, the second-axis conductive units 143a cross the
first-axis conductive units 141a from above, and the dielectric
layer 142 electrically insulates at least at the intersections
between the first-axis conductive units 141a and the second-axis
conductive units 143a. It can be seen that the second touch sensing
electrode layer 143 is separated from the first touch sensing
electrode layer 141 by the dielectric layer 142 to form bridge-like
structures, so the two-dimensional touch sensing module 140 of the
present embodiment is an OGS-SITO (One Glass Solution single-sided
indium tin oxide (ITO)) type touch module.
[0036] As shown in FIG. 1, the three-dimensional sensing panel
further includes a pressure sensing coating layer 160 and a
light-transmitting electrode layer 170. The pressure sensing
coating layer 160 is coated at a side of the two-dimensional touch
sensing module 140 away from the cover plate 110. The
light-transmitting electrode layer 170 is coated at a side of the
pressure sensing coating layer 160 away from the two-dimensional
touch sensing module 140. A force signal generated by the pressure
sensing coating layer 160 can be extracted through the
light-transmitting electrode layer 170.
[0037] In some embodiments, a material of the pressure sensing
coating layer 160 includes polyvinylidene difluoride (PVDF). In
other words, the pressure sensing coating layer 160 is a lattice
piezoelectric material. When a pressure is applied to a certain
direction of crystal of this material to produce deformation, the
magnitudes and the directions of the dipoles also change, so the
amount of charge also changes, thereby generating a voltage.
[0038] In some embodiments, a thickness of the pressure sensing
coating layer 160 is in a range from about 7 .mu.m to about 10
.mu.m (preferably about 8 .mu.m).
[0039] With the foregoing configuration, since the two-dimensional
touch sensing module 140 adopts the OGS architecture and the
pressure sensing coating layer 160 and the light-transmitting
electrode layer 170 are sequentially formed on the two-dimensional
touch sensing module 140 by coating processes, the adhesive used to
integrate the two-dimensional touch panel and the external pressure
sensor in the conventional three-dimensional touch-pressure
integrated panel can be omitted, which can effectively reduce the
overall thickness and manufacturing cost.
[0040] Reference is made to FIG. 3. FIG. 3 is a force vs. strength
of force signal graph of three-dimensional sensing panels
respectively using an OGS type touch sensing module and a GFF
(Glass-Film-Film) type touch sensing module. For example, the
experimental targets used to produce the graph shown in FIG. 3 may
be the three-dimensional sensing panel shown in FIG. 1 and another
three-dimensional sensing panel using a touch sensor model of the
GFF architecture. It can be clearly seen from FIG. 3 that the
strength of force signal obtained by the three-dimensional sensing
panel using the OGS type touch sensing module under the same force
is significantly greater than that of the three-dimensional sensing
panel using the GFF type touch sensing module, which helps increase
the efficiency of extracting the signal of force. The reason why
the two-dimensional touch sensing module 140 adopting the OGS
architecture in this embodiment can provide excellent signal
transmission characteristics is that the two-dimensional touch
sensing module 140 has a smaller thickness, while the GFF type
touch-sensing module has a large thickness due to the adhesive
needed to adhere the two films. It can also be said that the
excessive thickness of the GFF structure due to the multi-layer
stack structure will cause force transmission attenuation,
resulting in less obvious strength of force signal that can be
extracted by pressure sensing.
[0041] As shown in FIG. 1, the three-dimensional sensing panel
further includes an adhesive 180. The display module 190 is adhered
to a side of the light-transmitting electrode layer 170 away from
the pressure sensing coating layer 160.
[0042] In some embodiments, the light-transmitting electrode layer
170 can be a silver nanowire (SNW; also known as AgNW) electrode
layer. In detail, the light-transmitting electrode layer 170
includes a substrate and silver nanowires doped therein. The silver
nanowires overlap each other in the substrate to form a conductive
network. The substrate refers to a non-nanosilver material formed
by a solution including the silver nanowires through processes such
as coating, heating, and drying. The silver nanowires are
distributed or embedded in the substrate and partially protrude out
from the substrate. The substrate can protect the silver nanowires
from the external environment, such as protecting the silver
nanowires from corrosion and abrasion. In some embodiments, the
substrate is compressible.
[0043] In some embodiments, a wire length of the silver nanowires
ranges from about 10 .mu.m to about 300 .mu.m. In some embodiments,
a wire diameter (or a wire width) of the silver nanowires is less
than about 500 nm. In some embodiments, an aspect ratio of the
silver nanowires (the ratio of the wire length to the wire
diameter) is greater than 10. In some embodiments, the silver
nanowires can be deformed forms such as other conductive metal
nanowires or non-conductive nanowires coated with silver. The use
of the silver nanowires to form the silver nanowire electrode layer
has the following advantages compared with ITO: low price, simple
process, good flexibility, resistance to bending, and etc.
[0044] In some embodiments, at least one of the first touch sensing
electrode layer 141 or the second touch sensing electrode layer 143
can be a silver nanowire electrode layer, a metal grid, or an
indium tin oxide (ITO) electrode layer, but the disclosure is not
limited in this regard.
[0045] In some embodiments, the three-dimensional sensing panel has
an optical transmittance (to visible light having wavelengths in a
range of wavelength of 400-700 nm) greater than 90% and a haze less
than 3%. In order to make the three-dimensional sensing panel meet
the aforementioned requirements for optical transmittance and haze,
in some embodiments, at least one of the first touch sensing
electrode layer 141 or the second touch sensing electrode layer 143
is a silver nanowire electrode layer.
[0046] In some embodiments, a value of L* axis (i.e., the luminance
axis) of CIELAB color space of the three-dimensional sensing panel
measured by a colorimeter is equal to or greater than 92, but the
disclosure is not limited in this regard.
[0047] In some embodiments, a value of a* axis (i.e., the red-green
axis) of CIELAB color space of the three-dimensional sensing panel
measured by a colorimeter is in a range from about -1.5 to about
1.5, but the disclosure is not limited in this regard.
[0048] In some embodiments, a value of b* axis (i.e., the
yellow-blue axis) of CIELAB color space of the three-dimensional
sensing panel is in a range from about -2 to about 2, but the
disclosure is not limited in this regard.
[0049] Reference is made to FIG. 2. FIG. 2 is a top view of the
pressure sensing coating layer 160 according to an embodiment of
the disclosure. As shown in FIG. 2, the pressure sensing coating
layer 160 includes a plurality of pressure sensing blocks 161. The
pressure sensing blocks 161 are spaced apart from each other.
Moreover, the light-transmitting electrode layer 170 includes a
plurality of electrode blocks (not shown, please refer to the shape
of the pressure sensing blocks 161). The electrode blocks are
spaced apart from each other and respectively contact the pressure
sensing blocks 161. Hence, the force signal generated by an
individual one of the pressure sensing blocks 161 can be extracted
through a corresponding one of the electrode blocks, thereby
achieving the ability to perform multi-finger pressure-sensing
detection.
[0050] Reference is made to FIG. 4. FIG. 4 is a flowchart of a
method of manufacturing a three-dimensional sensing panel according
to an embodiment of the disclosure. As shown in FIG. 4, the method
includes steps S101 to S105.
[0051] In step S101, a two-dimensional touch sensing module is
disposed on a cover plate.
[0052] In step S102, a polymer coating layer is coated on a side of
the two-dimensional touch sensing module away from the cover
plate.
[0053] In some embodiments, step S102 can be performed by a
printing process, but the disclosure is not limited in this
regard.
[0054] In step S103, the polymer coating layer is dried.
[0055] In some embodiments, step S103 can be performed by baking
the polymer coating layer at a temperature of about 60 degrees
Celsius for about 30 minutes, and then annealing the polymer
coating layer at a temperature of about 135 degrees Celsius for
about 30 minutes, but the disclosure is not limited in this
regard.
[0056] In step S104, a light-transmitting electrode layer is coated
on a side of the dried polymer coating layer away from the
two-dimensional touch sensing module.
[0057] In some embodiments, step S104 can be performed by a spin
coating process with a rotation speed of about 3000 rpm, but the
disclosure is not limited in this regard.
[0058] In step S105, the dried polymer coating layer is polied to
transform the dried polymer coating layer into a pressure sensing
coating layer.
[0059] In some embodiments, a material of the polymer coating layer
includes PVDF. Before the polymer coating layer is polied, the
directions of the dipoles are arranged randomly. When poling the
dried polymer coating layer, an electric field can be applied to
the dried polymer coating layer so that the directions of the
dipoles are aligned in the forward direction based on the magnetic
field lines of the electric field.
[0060] In the present embodiment, although the step of coating the
light-transmitting electrode layer (i.e., step S104) is performed
before the step of poling the dried polymer coating layer (i.e.,
step S105), in other embodiments, the step of coating the
light-transmitting electrode layer can be performed after the step
of poling the dried polymer coating layer.
[0061] According to the foregoing recitations of the embodiments of
the disclosure, it can be seen that in the three-dimensional
sensing panel of the present disclosure, the two-dimensional touch
sensing module adopts the OGS architecture, and the pressure
sensing coating layer and the light-transmitting electrode layer
are sequentially formed on the two-dimensional touch sensing module
by coating processes. Therefore, the use of adhesive can be
omitted, which can effectively reduce the overall thickness and
manufacturing cost. In addition, the two-dimensional touch sensing
module using the OGS architecture also has a smaller thickness than
a two-dimensional touch sensing module using the GFF architecture
(that is, the OGS architecture uses a dielectric layer as a bridge
to concentrate the touch sensing electrode layer to a thickness of
a single layer, while eliminating the thickness of using adhesive
to stack a multi-layer structure of the GFF architecture and the
resulting reduction in force transmission rate), which can provide
excellent signal conduction characteristics and is conducive to the
efficiency of extracting power signals.
[0062] Although the present disclosure has been described in
considerable detail with reference to certain embodiments thereof,
other embodiments are possible. Therefore, the spirit and scope of
the appended claims should not be limited to the description of the
embodiments contained herein.
[0063] It will be apparent to those skilled in the art that various
modifications and variations can be made to the structure of the
present disclosure without departing from the scope or spirit of
the disclosure. In view of the foregoing, it is intended that the
present disclosure cover modifications and variations of this
disclosure provided they fall within the scope of the following
claims.
* * * * *