1. Field of the Invention
The present invention relates to a touch panel, more particularly relates to an optical touch panel.
2. Description of Related Art
Conventionally, touch panels with double-layered structure where optical detecting means and pressure-type detecting means are overlaid are known (Japanese Unexamined Patent Publication No. 2009-072232 A). In such a touch panel, the optical detecting means is located on an upper side (the side close to the operator) and pressure-type detecting means is located on a lower side (the side far from the operator).
In the first step, light beams of an optical detecting means are blocked with a finger to select a position. Next, in the second step, a pressure-type surface is pushed in with a finger as it is and a pressure-type detecting means is pressed by a finger to determine an input. This operation makes it possible to successively perform selective/input operations while preventing incorrect inputting caused by a touch of a finger or a sleeve.
However, the aforementioned conventional touch panel employs a pressure-type detecting means, so that a transparent conductive film should be arranged on a surface of a coordinate input region. The transparent conductive film has low optical transparency and is poor in scratch resistance. Accordingly, the conventional touch panel has such problems that visibility of the coordinate input region is deteriorated and durability is lowered.
It is therefore an object of the present invention to provide a touch panel free from deterioration in visibility and durability caused by a transparent conductive film placed on a coordinate input region.
The summary of the present invention is as follows:
In a first preferred embodiment of a touch panel according to the present invention, a coordinate input region is composed of a double-layered structure which comprises: an input selective region; and an input-determining region. The input selective region is included in a first optical detecting means and the input-determining region is included in a second optical detecting means. The first optical detecting means comprises: a first light-emitting section for emitting lattice emitting light to cross the input selective region; and a first light-receiving section for receiving the lattice emitting light. The second optical detecting means comprises: a second light-emitting section for emitting parallel emitting light to cross the input-determining region; and a second light-receiving section for receiving the parallel emitting light. The input selective region is located on an upper side (the side close to the operator). And the input-determining region is located on a lower side (the side far from the operator). When an input means blocks the lattice emitting light alone in the input selective region, the position of the input means is selected. When the input means further blocks the parallel emitting light in the input-determining region, the position of the input means is determined.
In a second preferred embodiment of the touch panel according to the present invention, the difference between the height of the lattice emitting light and the height of the parallel emitting light is 1 to 20 mm.
In a third preferred embodiment, a display device with a touch panel according to the present invention is made by the combination of the aforementioned touch panel and a display means for displaying a selected item in the coordinate input region.
A display device with a touch panel to be used in the present invention makes the user possible to make a selection while visually confirming a selected item. It is possible to determine the selective item simply by pushing an input means into an input-determining region at the time when a suitable item is selected. This enables the user to successively perform selective/input operations while preventing incorrect input caused by a touch of a finger or a sleeve.
Further, since there is no need to place a transparent conductive film on a surface of a region where coordinate input is done in the touch panel of the present invention, visibility of the display device is not deteriorated and its durability is high.
For a full understanding of the present invention, reference should now be made to the following detailed description of the preferred embodiments of the invention as illustrated in the accompanying drawings.
The preferred embodiments of the present invention will now be described with reference to
As shown in
In the first optical detecting means 13, X and Y-directional lattice emitting light 16 emitted from an L-shaped first light-emitting section 15 crosses the input selective region 11 in X and Y directions to be incident on an L-shaped first light-receiving section 17.
In the second optical detecting means 14, X-directional (unidirectional) parallel emitting light 19 emitted from an I-shaped second light-emitting section 18 crosses the input-determining region 12 in the X direction to be incident on an I-shaped light-receiving section 20.
In the first step, as shown in
Next, as shown in
The difference h between the height of the lattice emitting light 16 in the input selective region 11 and the height of the parallel emitting light 19 in the input-determining region 12 is a travel distance of the input means 21 from the selection of input to the determination of input. Such a height difference h is preferably 1 to 20 mm to obtain a touch panel superior in operational feeling.
As shown in
The display device 30 having the touch panel 10 of the present invention is capable of switching the highlighting (color modification or framing) and the like of the selected item by working with the movement of the input means 21 in the X and Y directions. Accordingly, it is possible for the user to make a selection while visually confirming the selected item.
It is possible for the user to determine the selected item simply by pushing the input means 21 into the input-determining region 12 at the time when a suitable item is selected. This method makes it possible to successively perform selective/input operations while preventing incorrect inputting caused by a touch of a finger or a sleeve.
Since there is no need to place a transparent conductive film on a surface of a region where coordinate input is done in the touch panel 10 of the present invention, visibility of the display means 31 is not deteriorated and its durability is high.
As shown in
In the first step, the input means (a finger or a pen) 21 is shallowly pushed into the input selective region 11 to block a portion of the emitting light 16a of the lattice emitting light 16. This makes it possible to detect the X and Y coordinates of the input means 21 in the input selective region 11. Although the position of the input means 21 is selected at this stage, the position is not determined.
In the second step, the input means 21 is further deeply pushed into the input-determining region 12 to block a portion of the emitting light 19a of the parallel emitting light 19. This makes it possible to detect that the input means 21 has reached the input-determining region 12. Input is determined at this stage. It is not necessary for the X and Y coordinates in the input means 21 to be detected in the input-determining region 12.
In a preferred embodiment of the display device 30 with a touch panel to be used in the present invention, as shown in
The display means 31 is used for displaying a plurality of selected items within the input selective region 11. The user usually selects one of the plurality of selected items displayed within the input selective region 11 using a finger or a pen as the input means 21.
In the present invention, the term “coordinate input region” refers to a region where the coordinates of the input position are selected and determined by the input device 21, such as a finger or a pen.
In the touch panel 10 of the present invention, the coordinate input region is composed of a double-layered structure which comprises: the input selective region 11; and the input-determining region 12. The input selective region 11 is included in the first optical detecting means 13. And the input-determining region 12 is included in the second optical detecting means 14.
In the first optical detecting means 13, the X and Y-directional lattice emitting light 16 emitted from the L-shaped first light-emitting section 15 crosses the input selective region 11 to be incident on the L-shaped first light-receiving section 17.
In the second optical detecting means 14, the X-directional (unidirectional) parallel emitting light 19 emitted from the I-shaped second light-emitting section 18 crosses the input-determining region 12 to be incident on the I-shaped second light-receiving section 20.
In the touch panel 10 of the present invention, the first light-emitting section 15, the first light-receiving section 17, the second light-emitting section 18, and the second light-receiving section 20 arranged in the vicinity of the touch panel 10 function as sensors. Accordingly, there is no need to place a transparent conductive film in the coordinate input region. The transparent conductive film has low scratch resistance (typically, keystroke life 10 million times) and low transparency (typically, optical transmittance: 78%).
The coordinate input region may be basically an open space (optical transmittance: 100%). To provide the user with a touch feeling or to protect the display from scratches, the transparent substrate 32 (a glass panel or an acrylic panel) having high transparency (optical transmittance of 90% or higher) may be arranged on the bottom.
The selected item displayed on the display means 31 in the coordinate input region is typically, a key board 33 as shown in
When the key “A” is determined by the operation in the second step, the user is able to visually confirm that the key “A” has been determined by displaying the key “A” in other color or displaying by blinking.
The selected item displayed by the display means 31 in the coordinate input region is not particularly limited, but is determined appropriately according to the uses, such as Bank ATM and ticket machines or the like.
The first optical detecting means 13 has the first light-emitting section 15 and the first light-receiving section 17. The X and Y-directional lattice emitting light 16 is emitted from the first light-emitting section 15 to cross the input selective region 11 in the X and Y directions to be incident on the first light-receiving section 17.
In the first step (
Any light-emitting section may be used as the light-emitting section 15 as long as it can generates the X and Y-directional lattice emitting light 16 in the coordinate input region. The first light-emitting section 15 is preferably formed in an L shape on two sides adjacent to each other in the input selective region 11. The first light-emitting section 15 is preferably formed by the arrangement of a plurality of light-emitting elements or by the arrangement of an optical waveguide (light-emitting sided-optical waveguide) connected to a light-emitting element.
The light-emitting element is preferably a light-emitting diode or a semiconductor laser, more preferably a VCSEL (Vertical Cavity Surface Emitting Laser). The wavelength of light emitted from the light-emitting element is preferably within a near-infrared region (700 to 2,500 nm).
The first light-receiving section 17 receives light beams which have crossed the input selective region 11 (light-receiving sided-optical waveguide). The first light-receiving sided-optical waveguide for forming the first light-receiving section 17 preferably includes a plurality of cores and a cladding layer where the cores are embedded.
The cores are formed of a material having a refractive index higher than that of the cladding layer. Further, the cores are formed of a material with high transparency at a wavelength of light to propagate. The material for forming the cores is preferably a UV curable resin having excellent patterning properties. Typically, the cores respectively have a width of 10 to 500 μm. The height of the cores is typically 10 to 100 μm.
The cladding layer is formed of a material having a refractive index lower than that of the cores. The maximum refractive index difference between the cores and the cladding layer is preferably at least 0.01 and more preferably 0.02 to 0.2. The material for forming the cladding layer is preferably a thermosetting resin or a UV curable resin.
The number of the cores is determined as appropriate according to the size and the resolution of the touch panel. For example, the number of the cores is preferably 50 to 500 when the touch panel has opposite angles of 10.4 inches.
The second optical detecting means 14 has the second light-emitting section 18 and the second light-receiving section 20. The X-directional (unidirectional) parallel emitting light 19 is emitted from the second light-emitting section 18 and then crosses the input-determining region 12 in the X direction to be incident on the second light-receiving section 20.
In the second step (
Any light-emitting section may be used as the light-emitting section 18 as long as it generates X-directional parallel emitting light 19. The second light-emitting section 18 is preferably formed in an I shape on one side of the input-determining region 12. The second light-emitting section 18 is preferably formed by the arrangement of a plurality of light-emitting elements or by the arrangement of an optical waveguide (light-emitting-sided optical waveguide) connected to a light-emitting element.
The light-emitting element is preferably a light-emitting diode or a semiconductor laser, more preferably a VCSEL (Vertical Cavity Surface Emitting Laser). The wavelength of light emitted from the light-emitting element is preferably within the near-infrared region (700 to 2,500 nm).
The second light-receiving section 20 receives light beams which have crossed the input-determining region (light-receiving sided-optical waveguide) 12. The light-receiving sided-optical waveguide for forming the second light-receiving section 20 preferably includes a plurality of cores and a cladding layer where the cores are embedded.
Unlike the light-receiving sided-optical waveguide for forming the first light-receiving section 17, the light-receiving sided-optical waveguide for forming the second light-receiving section 20 does not need to detect the X and Y coordinates in the input means 21. Since the light-receiving sided-optical waveguide for forming the second light-receiving section 20 may simply detect the blocking signal by the input means 21, the number of the cores may be fewer than that of the light-receiving sided-optical waveguide for forming the first light-receiving section 17. For example, in the case of a touch panel having opposition angles of 10.4 inches, the number of the cores in the light-receiving-sided optical waveguide for forming the second light-receiving section 20 is preferably 25 to 250.
[Display Device with Touch Panel]
In a preferred embodiment, the touch panel 10 to be used in the present invention is combined with the display means 31 to be used as the display device 30 with a touch panel. As shown in
As shown in
As shown in
As shown in
The light-receiving element 34 to be used in the present invention converts an optical signal to an electrical signal to detect the intensity of light received at the first light-receiving section 17 and the second light-receiving section 20. Examples of such a light-receiving element 34 includes a Complementary Metal-Oxide Semiconductor (CMOS) image sensor or a Charge Coupled Device (CCD) image sensor.
The number of the light-receiving elements 34 to be used for the display device 30 with a touch panel of the present invention is preferably 1 to 4. As shown in
The processing circuit 35 processes blocking signals of the light-receiving element 34. More specifically, the first processing is to transmit information indicating that a certain item has been selected to the display means 31 by the blocking signals detected by the first optical detecting means 13.
The second processing is to transmit information indicating that the selected item has been determined to the display means 31 by the blocking signals detected by the second optical detecting means 14.
Examples of the processing circuit 35 include a Central Processing Unit (CPU) and a Field Programmable Gate Array (FPGA).
The display means 31 displays information based on the coordinates recognized by the processing circuit 35. The display means 31 is not particularly limited as long as it can display characters and figures. A liquid crystal display and a plasma display are typically used as the display means 31.
While the present invention has been described so far based on preferred embodiments, it is to be understood that the touch panel and the display device with a touch panel of the present invention are not limited to the configuration of the aforementioned preferred embodiments.
While the applications of the touch panel and the display device with a touch panel of the present invention are not particularly limited, examples of the applications of the touch panel and the display device with a touch panel of the present invention include apparatuses having a high load used by a large indefinite number of users, such as bank ATM systems, railway ticket-vending machines, shop POS systems, search terminals in libraries, operation panels of copiers and production facilities or the like.
This application claims priority from Japanese Patent Application No. 2009-180412, which is incorporated herein by reference.
There have thus been shown and described a novel touch panel and a novel display device with a touch panel which fulfill all the objects and advantages sought therefor. Many changes, modifications, variations and other uses and applications of the subject invention will, however, become apparent to those skilled in the art after considering this specification and the accompanying drawings which disclose the preferred embodiments thereof. All such changes, modifications, variations and other uses and applications which do not depart from the spirit and scope of the invention are deemed to be covered by the invention, which is to be limited only by the claims which follow.
Number | Date | Country | Kind |
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2009-180412 | Aug 2009 | JP | national |
Number | Date | Country | |
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61248577 | Oct 2009 | US |