KR101144568B1 - Input device - Google Patents

Abstract

An input device is disclosed. The input device comprises a first electrode; A plurality of provisional electrodes disposed on the first electrode; And a second electrode disposed on the sides of the provisional electrodes. By the provisional electrodes, the input device is prevented from reducing image quality, and the visibility is improved.

Touch, capacitance, capacitance, panel, electrode

Description

Input device {INPUT DEVICE}

An embodiment relates to an input device.

BACKGROUND With the development and popularization of graphical user interface (GUI) systems, the use of touchscreens with simple inputs has become commonplace.

The touch screen may adopt a resistive film method, a capacitive method, an optical sensor method, an ultrasonic method, an electromagnetic method, a vector force method, or the like.

The resistive film method is a method in which a transparent conductive film between two substrates is in contact with each other and is easily implemented and excellent in touch screen methods. However, mechanical and environmental reliability is inferior.

The optical sensor method is a method of determining a position when the optical path between the optical output device and the optical input device is blocked, and has a disadvantage of being affected by external light and a large circuit size because the circuit part is installed at the outer part.

Similar to the optical sensor method, the ultrasonic method or the surface acoustic wave method has a disadvantage in that it is vulnerable to noise or noise in the factory by determining the position when the acoustic path between the acoustic wave generating element and the acoustic wave recognition element is blocked.

The electromagnetic method is a method using the magnetism and the electromotive force generation principle of the Faraday law, and calculates the coordinates by determining the amount of current flowing through the unit coil for each position. Since a signal of alternating current must be applied to the coil, a special dedicated pen is needed.

The capacitive method is a method that detects the minute current flowing in response to the change in capacitance coupled between the sensor electrode and the finger and determines the position. However, the capacitive method is weak in noise signals, but it is strong in environmental reliability and changes the protective layer on the upper touch screen. Therefore, there is an advantage that the mechanical reliability can be changed freely. Capacitive methods can be divided into analog and digital methods.

Embodiments provide an input device having improved sensitivity by improving image quality and reducing parasitic capacitance between a first electrode and a second electrode.

An input device according to an embodiment includes a first electrode; A plurality of provisional electrodes disposed on the first electrode; And a second electrode disposed on the sides of the provisional electrodes.

An input device according to another embodiment includes a first substrate including a plurality of first electrodes extending in a first direction; And a second substrate facing the first substrate, the second substrate including a plurality of second electrodes extending in a second direction and temporary electrodes disposed between the second electrodes.

The input device according to the embodiment includes the provisional electrodes disposed between the second electrodes. In this case, the provisional electrodes may be formed of the same material as the second electrodes between the second electrodes spaced apart from each other.

Therefore, the provisional electrodes can compensate for the deterioration in image quality due to the difference in refractive index between the portion where the second electrodes are disposed and the portion where the second electrodes are not disposed.

Therefore, the input device according to the embodiment prevents image quality reduction by the provisional electrodes and improves visibility.

In addition, the provisional electrodes are disposed on the first electrode. Therefore, the first electrode can sense an external touch through the provisional electrodes, and can increase the distance between the first electrode and the second electrode.

Therefore, the input device according to the embodiment can reduce the parasitic capacitance between the first electrode and the second electrode, and can implement an improved sensitivity.

In the description of the embodiments, each panel, member, layer, pad or substrate or the like is described as being formed "on" or "under" of each panel, member, layer, pad or substrate or the like. In the case, “on” and “under” include both being formed “directly” or “indirectly” through other components. In addition, the upper or lower reference of each component is described with reference to the drawings. The size of each component in the drawings may be exaggerated for the sake of explanation and does not mean the size actually applied.

1 is an exploded perspective view illustrating a capacitive touch panel according to an embodiment. 2 is a front view illustrating a lower surface of the upper substrate. 3 is a plan view illustrating an upper surface of a lower substrate. FIG. 4 is a cross-sectional view illustrating a cross section taken along line AA ′ in FIG. 3. 5 is a diagram illustrating capacitance generated when a user's finger is touched.

1 to 5, the capacitive touch panel includes an upper substrate 100, a lower substrate 200, a barrier substrate 300, a first adhesive member 400, and a second adhesive member 500. And a substrate 600.

The upper substrate 100 includes a first transparent substrate 110, first electrodes 120, provisional electrodes 130, first lead electrodes 140, and first pad electrodes 150.

The first transparent substrate 110 is transparent and is an insulator. The first transparent substrate 110 is a film substrate or a glass substrate.

The first electrodes 120 are disposed under the first transparent substrate 110. A plurality of first electrodes 120 are spaced apart from each other and extend in the Y direction. The first electrodes 120 are transparent and are conductors. Examples of the material used as the first electrodes 120 may include indium tin oxide (ITO), indium zinc oxide (IZO), or the like.

The first electrode 120 includes a plurality of first sensing electrodes 121 and first connectors 122.

The first sensing electrodes 121 are arranged in a line in the Y direction. The first sensing electrodes 121 have a plane shape of a rhombus shape.

The first connectors 122 are disposed between the first sensing electrodes 121. The first connectors 122 connect the first sensing electrodes 121. The first connectors 122 and the first sensing electrodes 121 are integrally formed.

The provisional electrodes 130 are disposed between the first electrodes 120. The provisional electrodes 130 are disposed on the sides of the first electrodes 120. In more detail, the provisional electrodes 130 are disposed between the first sensing electrodes 121, respectively. The distance D between the temporary electrodes 130 and the first sensing electrodes 121 is about 0.2 to 0.3 mm. The provisional electrodes 130 are disposed under the first transparent substrate 110. In addition, the home appliance poles 130 are disposed on the same plane as the first electrodes 120.

The provisional electrodes 130 have an island shape. In addition, the provisional electrodes 130 have a planar shape of a rhombus shape.

The provisional electrodes 130 are transparent conductors. The provisional electrodes 130 have optical characteristics corresponding to the optical characteristics of the first electrodes 120. In more detail, the provisional electrodes 130 are formed of the same material as the first electrodes 120.

For example, a transparent conductive layer may be deposited on the first transparent substrate 110, and the transparent conductive layer may be patterned to form the first electrodes 120 and the provisional electrodes 130. That is, the first electrodes 120 and the provisional electrodes 130 contact the first transparent substrate 110.

The first lead electrodes 140 are connected to the first electrodes 120, respectively. The first lead electrodes 140 connect the first electrodes 120 and the first pad electrodes 150, respectively.

The first pad electrodes 150 are connected to the first electrodes 120 through the first lead electrodes 140, respectively. The first pad electrodes 150 are connected to the connection substrate 600.

The first lead electrodes 140 and the first pad electrodes 150 are integrally formed with a material having a low resistance. The first lead electrodes 140 and the first pad electrodes 150 have a much lower resistance than the first electrodes 120 and the provisional electrodes 130.

The first lead electrodes 140 and the first pad electrodes 150 are disposed under the first transparent substrate 110 in contact with each other. Examples of the material used as the first lead electrodes 140 and the first pad electrodes 150 may include copper, aluminum, silver, and the like.

The lower substrate 200 is disposed below the upper substrate 100. The lower substrate 200 faces the upper substrate 100. The lower substrate 200 is spaced apart from the upper substrate 100.

The lower substrate 200 includes a second transparent substrate 210, a plurality of second electrodes 220, second lead electrodes 240, and second pad electrodes 250.

The second transparent substrate 210 corresponds to the first transparent substrate 110 and is a glass substrate or a film substrate. The second transparent substrate 210 is transparent and is an insulator.

The second electrodes 220 extend in the X-axis direction. The second electrodes 220 intersect the first electrodes 120. The second electrodes 220 are spaced apart from each other and are arranged side by side.

The second electrodes 220 are transparent and are conductors. Examples of the material used as the second electrodes 220 include indium tin oxide or indium zinc oxide.

The second electrodes 220 are disposed on the second transparent substrate 210 and are in contact with the second transparent substrate 210.

The second electrode 220 includes second sensing electrodes 221 and second connectors 222.

The second sensing electrodes 221 are arranged in a line in the X direction on the second transparent substrate 210. The second sensing electrodes 221 have a planar shape of a rhombus shape. The second sensing electrodes 221 correspond to the temporary electrodes 130, respectively.

The second sensing electrodes 221 are disposed under the temporary electrodes 130, respectively. That is, the provisional electrodes 130 are disposed on the second sensing electrodes 221, respectively. That is, the provisional electrode 130 is disposed on the second electrode 220.

In addition, the provisional electrode 130 covers the second sensing electrode 221 in a plan view. That is, the width W1 of the temporary electrode 130 is larger than the width W2 of the second sensing electrode 221.

For example, the width W1 of the temporary electrode 130 is about 0.5 to 2 mm, and the width W2 of the second sensing electrode is about 0.4 to 1.8 mm.

The second connectors 222 are disposed between the second sensing electrodes 221, respectively. The second connectors 222 connect the second sensing electrodes 221, respectively. The second sensing electrodes 221 and the second connectors 222 are integrally formed with each other.

The second lead electrodes 240 are respectively connected to the second electrodes 220. The second lead electrodes 240 connect the second electrodes 220 and the second pad electrodes 250, respectively.

The second pad electrodes 250 are connected to the second electrodes 220 through the second lead electrodes 240, respectively. The second pad electrodes 250 are connected to the connection substrate 600.

The second lead electrodes 240 and the second pad electrodes 250 are disposed on the second transparent substrate 210 and have a low resistance.

That is, the second lead electrodes 240 and the second pad electrodes 250 have a much lower resistance than the second electrodes 220. Examples of the material used for the second lead electrodes 240 and the second pad electrodes 250 include copper, aluminum, silver, molybdenum, and the like.

The barrier substrate 300 is disposed below the lower substrate 200. The barrier substrate 300 blocks interference from devices such as a display panel disposed under the touch panel. That is, electromagnetic waves generated from devices such as the display panel are blocked.

The barrier substrate 300 includes a third transparent substrate 310 and a shielding electrode 320.

The third transparent substrate 310 faces the second transparent substrate 210. The third transparent substrate 310 may support the upper substrate 100 and the lower substrate 200. The third transparent substrate 310 may be rigid, and the third transparent substrate 310 may be a glass substrate.

The shielding electrode 320 is formed on the entire surface of the third transparent substrate 310. The shielding electrode 320 is transparent and is a conductor. Examples of the material used as the shielding electrode 320 may include indium tin oxide or indium zinc oxide.

The first adhesive member 400 is interposed between the upper substrate 100 and the lower substrate 200. The first adhesive member 400 is transparent and insulator. The first adhesive member 400 bonds the upper substrate 100 and the lower substrate 200. Examples of the material used as the first adhesive member 400 include a photocurable resin, a thermosetting resin or a thermoplastic resin.

The second adhesive member 500 is interposed between the lower substrate 200 and the barrier substrate 300. The second adhesive member 500 is transparent and insulator. The second adhesive member 500 bonds the lower substrate 200 and the barrier substrate 300. Examples of the material used as the second adhesive member 500 include a photocurable resin, a thermosetting resin, a thermoplastic resin, and the like.

The connection substrate 600 is connected to the upper substrate 100, the lower substrate 200, and the barrier substrate 300. In detail, the connection substrate 600 is connected to the first pad electrode 150, the second pad electrode 250, and the shielding electrode 320.

The connection substrate 600 includes a first connection substrate 610, a second connection substrate 620, and a third connection substrate 630.

The first connection substrate 610 is interposed between the upper substrate 100 and the first adhesive member 400 to be connected to the first pad electrode 150.

The second connection substrate 620 is interposed between the lower substrate 200 and the first adhesive member 400 to be connected to the second pad electrode 250.

The third connection substrate 630 is interposed between the barrier substrate 300 and the second adhesive member 500 to be connected to the shielding electrode 320.

The touch panel according to the embodiment includes a driver 700 for sensing a signal such as a touch from the first electrodes 120 and the second electrodes 220.

For example, the driver 700 sequentially applies an AC voltage to the first electrodes 120 and the second electrodes 220 through the connection substrate 600. In this case, the driver 700 senses capacitance generated when a conductor such as a finger 800 is disposed on a portion of the first electrodes 120 and a portion of the second electrodes 220. In more detail, the driver 700 senses the capacitance reactance due to the capacitance and senses the position of the finger 800 or the like.

Referring to FIG. 5, the Y-axis coordinate is sensed in the following manner.

When the finger 800 is positioned on the upper substrate 100, a first capacitance C1 is formed between the provisional electrode 130 corresponding to the finger 800 and the finger 800. In addition, a second capacitance C2 is formed between the provisional electrode 130 corresponding to the finger 800 and the second sensing electrode 221 corresponding to the finger 800.

In this case, since the distance between the finger 800 and the provisional electrode 130 is greater than the distance between the provisional electrode 130 and the second sensing electrode 221, the value of the second capacitance C2 is greater than the distance between the finger 800 and the provisional electrode 130. It is relatively much larger than the value of the first capacitance C1.

Thus, the overall capacitance depends on the first capacitance C1.

Therefore, a current flows in the second electrode 220 corresponding to the position of the finger 800, and the driving unit 700 adjusts the capacitance reactance of the second electrode 220 corresponding to the position of the finger 800. By measuring, the Y-axis coordinate of the finger 800 may be sensed.

In this case, as the width of the second sensing electrode 221 becomes smaller, the distance between the second sensing electrode 221 and the first sensing electrode 121 increases. Accordingly, the parasitic capacitance between the first sensing electrode 121 and the second sensing electrode 221 is reduced.

Therefore, the touch panel according to the embodiment can prevent the malfunction due to the parasitic capacitance between the first sensing electrode 121 and the second sensing electrode 221.

In addition, the provisional electrode 130 compensates for a decrease in sensing sensitivity that may occur as the width W2 of the second sensing electrode 221 becomes smaller. That is, compared with the case where the provisional electrode 130 is not disposed, the capacitance generated by the finger 800 when the provisional electrode 130 is disposed is further increased.

Therefore, the touch panel according to the embodiment reduces the malfunction and improves the reception sensitivity.

In addition, empty spaces between the first electrodes 120 are filled by the provisional electrodes 130. In this case, the provisional electrode 130 has optical characteristics substantially the same as those of the first electrodes 120. Therefore, when viewed in plan view, the area of the portion where the optical properties of the layer in which the first electrodes 120 are disposed is changed is very small. That is, the distance between the first electrodes 120 and the provisional electrodes 130 is very small.

Therefore, the layer in which the first electrodes 120 are disposed has the same optical characteristic as the entire plane when viewed with the eyes of a user, and reduces distortion of light passing through.

Accordingly, the touch panel according to the embodiment prevents deterioration of image quality and improves visibility.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood that various modifications and applications are possible. For example, each component specifically shown in the embodiment can be modified. And differences relating to such modifications and applications will have to be construed as being included in the scope of the invention defined in the appended claims.

1 is an exploded perspective view illustrating a capacitive touch panel according to an embodiment.

2 is a front view illustrating a lower surface of the upper substrate.

3 is a plan view illustrating an upper surface of a lower substrate.

FIG. 4 is a cross-sectional view illustrating a cross section taken along line AA ′ in FIG. 3.

5 is a diagram illustrating capacitance generated when a user's finger is touched.

Claims (12)

A first electrode; A plurality of provisional electrodes disposed on the first electrode; And A second electrode disposed on the sides of the temporary electrodes, The first electrode may include first sensing electrodes arranged in a line in one direction; And And connecting parts connecting the first sensing electrodes between the first sensing electrodes, The provisional electrodes are disposed to correspond to the first sensing electrodes, respectively. The provisional electrode covers the first sensing electrode. The input device of claim 1, wherein the first electrode, the second electrode, and the temporary electrodes are transparent. The input device of claim 1, wherein the provisional electrodes and the second electrode are disposed on the same plane. The input device of claim 1, wherein the provisional electrodes have an island shape. The method of claim 1, further comprising a driver for sensing a change in capacitance between the conductor disposed on the first electrode and the first electrode, The driving unit senses a position of the conductor by sensing a change in capacitance between the conductor and the second electrode. delete A first substrate including a plurality of first electrodes extending in a first direction; And A second substrate facing the first substrate, the second substrate including a plurality of second electrodes extending in a second direction and temporary electrodes disposed between the second electrodes, The first electrode is First sensing electrodes arranged in a line in the first direction; And And connecting parts connecting the first sensing electrodes between the first sensing electrodes, The input electrodes correspond to the first sensing electrodes. delete The input device of claim 7, wherein a width of the first sensing electrodes is smaller than a width of the temporary electrode. The input device of claim 7, wherein the first sensing electrodes and the provisional electrodes have a rhombus plane shape. A first substrate including a plurality of first electrodes extending in a first direction; And A second substrate facing the first substrate, the second substrate including a plurality of second electrodes extending in a second direction and temporary electrodes disposed between the second electrodes, A driver configured to measure a first capacitance between a conductor disposed between the first substrate and the provisional electrode corresponding to the conductor, and a second capacitance between the provisional electrode corresponding to the conductor and the first electrode corresponding to the conductor Input device. 12. The input device of claim 11, wherein the magnitude of the first capacitance is smaller than the magnitude of the second capacitance.

Images