TWI489356B - Touch display device and touch sensing device - Google Patents

Description

Touch display device and touch device

The present invention relates to a touch device, and more particularly to a capacitive touch device.

At present, touch technologies commonly used in electronic devices are: resistive, surface capacitive, projected capacitive, surface acoustic wave, optics imaging, infrared. Infrared, bending wave, and active digitizer. The first three technologies are relatively high in precision because they are small in size, so they are suitable for smaller mobile devices or consumer electronics.

In the case of resistive touch technology, there are physical limitations in physical technology from touch screen to contact detection, data calculation, and position confirmation. For example, contact detection can cause excessive wear of certain areas due to the constant range of frequent contacts, thereby reducing the conduction efficiency of the conductive film contact. In addition, resistive touch technology does not achieve near-side sensing (detection of fingers near untouched state) and the difficulty of handling multi-finger touch.

The driving principle of capacitive touch technology is different from that of resistive touch. In the capacitive touch device, electrodes in the X direction and the Y direction are respectively disposed in the upper and lower layers. A capacitance difference occurs when a user touches or approaches a touch device with a finger or other control element. At this point the system can calculate the location of the contact. Among them, the surface capacitive touch technology is more prone to the problem of hand shadow effect, that is, when the surface capacitive touch screen is operated, if the wrist and the finger are brought close to the screen surface, the conductive film surface and the panel side are generated. Excessive charge, which in turn causes coupling of the capacitor, causes a large number of sensing errors. In addition, since the surface capacitance type is used for contact detection through the electric field change on the surface of the screen, if the electromagnetic environment has many problems, the precision of the contact detection will be affected, and after a long time of use, Contact detection is also prone to offset.

The projected capacitive touch technology is less prone to hand-shadow effect, wear or similar mechanical fatigue, and the sensitivity of the touch is reduced, and the near-sensing can be detected. However, in order to enhance the capacitive sensing signal and avoid delay or failure of the sensing signal, the electrode design of the conventional projected capacitive touch technology still has room for improvement, and how to improve the detection precision of the touch device is still One of the major issues in the field of touch.

An object of the present invention is to provide a touch display device and a touch device, thereby solving the aforementioned conventional problems.

The present invention provides a touch display device including a display panel and a touch sensing component disposed on the display panel. The touch sensing component includes a sensing electrode and a driving electrode. The sensing electrodes are disposed substantially parallel to the display panel in the first direction; and the driving electrodes are disposed substantially parallel to the display panel in the second direction. The driving electrode and the sensing electrode are interleaved to form a plurality of capacitive sensing units. Each of the sensing electrodes includes a main electrode strip and a plurality of branch electrode portions connected to the main electrode strip. The driving electrodes of each of the capacitance sensing units include at least one peripheral electrode strip and at least one inner electrode strip, and are arranged alternately with the branch electrode portions of the sensing electrodes. Wherein the peripheral electrode strip has a first width, the inner electrode strip has a second width in the first direction, and the first width is smaller than the second width.

According to another preferred embodiment of the present invention, the present invention further provides a touch device including a substrate, a sensing electrode, and a driving electrode. The sensing electrodes are disposed substantially parallel to the substrate along the first direction; and the driving electrodes are disposed substantially parallel to the substrate along the second direction. The driving electrode and the sensing electrode are interleaved to form a plurality of capacitive sensing units. Each of the sensing electrodes includes a main electrode strip and a plurality of branch electrode portions, and the branch electrode portion is connected to the main electrode strip. The driving electrodes of each of the capacitance sensing units include at least one peripheral electrode strip and at least one inner electrode strip, and are arranged alternately with the branch electrode portions of the sensing electrodes. The peripheral electrode strip has a first width, the inner electrode strip has a second width in the first direction, and the first width is smaller than the second width.

In an embodiment of the invention, the ratio of the first width to the second width is substantially less than or equal to 0.8 and greater than or equal to 0.06; preferably, the ratio of the first width to the second width is substantially less than or equal to 0.7 and greater than Equal to 0.07; more preferably, the ratio of the first width to the second width is substantially equal to or less than 0.66 and greater than or equal to 0.0941.

Since the width of the peripheral electrode strip of the present invention is smaller than the width of the inner electrode strip, the distance between the adjacent capacitive sensing units in the first direction is reduced, and the sensing signals detected by the adjacent capacitive sensing units are compared with each other. The large overlapping area can effectively improve the sensing sensitivity and increase the linearity of the touch display device and the touch device in the first direction.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

In the following, the touch display device and the touch device according to the present invention are described in detail with reference to the accompanying drawings, but the embodiments are not intended to limit the scope of the present invention, and the method flow steps are not described. To limit the order of their execution, any method that has been re-combined by method steps, resulting in equal efficiency, is within the scope of the present invention. The drawings are for illustrative purposes only and are not drawn to the original dimensions.

1 to FIG. 6 , FIG. 1 is a schematic diagram of a layout of a capacitive sensing unit according to a preferred embodiment of the present invention, and FIG. 2 is a cross section of a capacitive sensing unit applied to the touch display device according to a preferred embodiment of the present invention; 3 is a schematic diagram of a capacitive sensing unit of a comparative example, FIG. 4 is a schematic diagram of a sensing signal of a capacitive sensing unit in a first direction, and FIG. 5 is a schematic diagram of a capacitive sensing unit according to a preferred embodiment of the present invention. The linearity test diagram is shown, and FIG. 6 is a schematic diagram of the linearity test of the capacitance sensing unit of the comparative example. The same elements or parts in the drawings are denoted by the same symbols. In order to clearly show the layout structure of the present invention, the dielectric layer of the present embodiment is illustrated in a see-through manner, but the dielectric layer is not limited to a transparent material.

Example:

As shown in FIG. 1 , the touch sensing component 150 is disposed on the substrate 10 , and includes a sensing electrode 20 , a driving electrode 40 , a first circuit first connecting line 32 , a second circuit second connecting line 34 , and a bridge line 30 . The touch sensing component 150 can be a capacitive touch device, such as a projected capacitive touch matrix structure, and more particularly a mutual type projected capacitive touch matrix structure. The sensing electrode 20 and the driving electrode 40 are composed of two different sets of electrodes, which are respectively connected to the first circuit first connecting line 32 and the second circuit second connecting line 34. The sensing electrodes 20 are substantially parallel to the substrate 10 in the first direction 12 , and the driving electrodes 40 are substantially parallel to the substrate 10 in the second direction 14 . The first direction 12 and the second direction 14 may be, for example, an X-axis direction and a Y-axis direction that are perpendicular to each other, but are not limited thereto, and the first direction 12 and the second direction 14 may actually intersect at any angle. Accordingly, the driving electrode 40 and the sensing electrode 20 are staggered with each other to form a plurality of capacitance sensing units 60, and the capacitance sensing units 60 may be arranged in an array. The first circuit first connection line 32 and the second circuit second connection line 34 can be used to output an input/output sensing signal, and can be further connected or include a sensing circuit (not shown) for processing the sensing signal. The calculated position is calculated.

In order to facilitate integration with the display device, the sensing electrode 20, the driving electrode 40 and the substrate 10 are preferably made of a transparent or transparent material. For example, the substrate 10 can be, for example, a glass substrate or an acrylic substrate for a display device. The upper substrate, and the sensing electrode 20 and the driving electrode 40 preferably comprise a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZZnO). Bridge wire 30 can comprise a transparent conductive material, a metallic material, other conductive materials, or a combination thereof. The sensing electrode 20 and the driving electrode 40 are preferably formed by the same conductive layer, the electrode blocks of the driving electrode 40 are connected by a bridge wire 30, and a patterned dielectric layer is disposed between the bridge wire 30 and the sensing electrode 20. The insulating block (not shown) is used to electrically isolate the bridge wire 30 from the sensing electrode, but is not limited thereto. The gap between the sensing electrode 20 and the driving electrode 40 serves as a dielectric space of the capacitor, and a dielectric material may be filled therein, or a gap may be directly used as a dielectric portion of the capacitor.

Each of the sensing electrodes 20 may include a main electrode strip 22 and a plurality of branch electrode portions 24 connected to the main electrode strip 22; and the driving electrode 40 of each of the capacitive sensing units 60 may include at least one peripheral electrode strip 42 and at least one inner side Electrode strip 44. The greater the mutual capacitance between the driving electrode 40 and the sensing electrode 20, the greater the amount of change in the coupled sensing signal caused by the touch, which can provide higher touch sensitivity. In order to increase the mutual capacitance, the driving electrode 40 and the sensing electrode 20 are preferably designed in a staggered structure, so that the electrode area of the driving electrode 40 and the sensing electrode 20 opposite to each other is increased, so that the peripheral electrode strip 42 and the inner electrode strip 44 and the branch electrode The sections 24 are staggered. For example, each of the branch electrode portions 24 of the present embodiment may be a linear branch electrode strip, and each of the branch electrode strips extends substantially perpendicular to the main electrode strip 22 and extends outward. In other embodiments, the shape, number, and configuration of the branch electrode portions 24 can be adjusted depending on the product design without being limited by FIG.

On the other hand, each of the main electrode strips 22 of the present embodiment is preferably a linear electrode strip, and each of the linear electrode strips may pass through the corresponding capacitive sensing unit 60. In this way, the sensing signal can have a short linear distance from the input end from the input end. When the distance through which the current signal flows is shortened, the resistance value can be reduced, thereby reducing the chance of sensing signal output delay or output failure, and in particular, providing a more significant improvement effect on a large-sized touch device.

For the portion of the driving electrode 40, the peripheral electrode strip 42 of each of the capacitance sensing units 60 may be disposed between the sensing electrode 20 and the adjacent capacitive sensing unit 60. The peripheral electrode strips 42 of each of the capacitor sensing units 60 may include at least one first peripheral portion 42a and at least one second peripheral portion 42b respectively on opposite sides of the corresponding sensing electrodes 20. The first peripheral portion 42a and the second peripheral portion 42b of each of the peripheral electrode strips 42 can be connected via a bridge wire 30, and the main electrode strips 22 of the respective capacitive sensing units 60 can span the corresponding bridge wires 30. In this embodiment, the first peripheral portion 42a and the second peripheral portion 42b can be, for example, U-shaped electrodes, that is, the first peripheral portion 42a and the second peripheral portion 42b are respectively formed by the first electrode strip. 43a, the second electrode strip 43b and the third electrode strip 43c are formed, and the second electrode strip 43b is perpendicular to the first electrode strip 43a and the third electrode strip 43c.

In the present invention, the driving electrode 40 and the sensing electrode 20 may be formed on the substrate 10, and then the bridge wire 30 may be formed on the driving electrode 40 and the sensing electrode 20. The bridge wire 30 may be formed on the substrate 10 before the bridge wire 30. The driving electrode 40 and the sensing electrode 20 are formed; or in other embodiments, the driving electrode 40 and the sensing electrode 20 may not be formed by the same conductive layer, for example, the driving electrode 40 and the bridge wire 30 are formed by the same conductive layer, and the sensing The electrode 20 and the bridge wire 30 are formed by the same conductive layer, or the driving electrode 40, the sensing electrode 20 and the bridge wire 30 are formed by different conductive layers, and the relative positions of the upper and lower sides are not limited by the drawings.

It is noted that in the present invention, the peripheral electrode strip 42 (ie, the first electrode strip 43a) has a first width W1, and the inner electrode strip 44 has a second width W2 in the first direction 12, and the first width W1 is smaller than the first width W1. Two width W2. For example, in the embodiment, the ratio of the first width W1 to the second width W2 is substantially equal to or less than 0.8 and greater than or equal to 0.06. Preferably, the ratio of the first width W1 to the second width W2 is substantially less than or equal to 0.7. And greater than or equal to 0.07; or more preferably, the ratio of the first width W1 to the second width W2 is substantially equal to or less than 0.66 and greater than or equal to 0.0941.

Since the first width W1 of the peripheral electrode strip 42 of the present invention is smaller than the second width W2 of the inner electrode strip 44, the distance between adjacent capacitive sensing units 60 in the first direction 12 is reduced, and the adjacent capacitive sensing unit 60 The detected sensing signals have a large overlapping area with each other, which can effectively improve the sensing sensitivity and increase the linearity sensed by the touch sensing component 150 in the first direction 12 .

As shown in FIG. 2 , the touch sensing component 150 of the present invention can be applied to the touch display device 100 . For example, the touch sensing component 150 can be directly formed on the display panel 130. The display panel 130 can include any display device such as a liquid crystal display panel, an organic light emitting display panel, an electrophoretic display panel, or a plasma display panel. The display panel 130 of the present embodiment is an example of a liquid crystal display panel. The display panel 130 may include a substrate 10, a substrate 16, and a liquid crystal layer 18 disposed between the substrate 10 and the substrate 16. The touch sensing component 150 can be formed on the outer side of the substrate 10 , that is, the touch sensing component 150 and the liquid crystal layer 18 are located on opposite sides of the substrate 10 . The substrate 16 may include, for example, a thin film transistor array substrate, and the substrate 10 may include, for example, a color filter substrate, but is not limited thereto.

Referring to FIG. 1 and FIG. 2 together, when a conductor or other control component 70 such as a finger or a stylus touches or is adjacent to the touch sensing component 150, the control component 70 changes the signal coupling of the driving electrode 40 to the sensing electrode 20. The size of the signal, the sensing circuit can be used to determine the touch position.

Comparative example:

As shown in FIG. 3, the sensing electrode 320 of the comparative example includes a main electrode strip 322 and a branch electrode portion 324. The driving electrode 340 of each capacitive sensing unit 360 includes a peripheral electrode strip 342 and an inner electrode strip 344, and the bridge line 330 can span. The drive electrode 340 is connected to the sensing electrode 320. The main difference between the comparative example and the embodiment of the present invention is that the width W3 of the peripheral electrode strip 342 of the comparative example is equal to the width W3 of the inner electrode strip 344.

As shown in FIG. 4, the fold line X1o, the fold line X2o, the fold line X3o, the fold line X4o, and the fold line X5o are the sensing signals of the respective capacitance sensing units 360 of the comparative example in the first direction 12, and the fold line X3n is The capacitive sensing unit 60 of the preferred embodiment of the present invention has a sensing signal in the first direction 12, wherein the capacitive sensing unit 360 of the broken line X3o and the capacitive sensing unit 60 of the broken line X3n are substantially disposed on On the same coordinates. As can be seen from FIG. 4, since the first width W1 of the peripheral electrode strip 42 of the present invention is smaller than the second width W2 of the inner electrode strip 44 (as shown in FIG. 1), the adjacent capacitive sensing units in the first direction 12 The distance between 60 is reduced. As a result, the sensing signals detected by the adjacent capacitive sensing units 60 can have a large overlapping area with each other.

As shown in FIG. 5 and FIG. 6 , when the control element 70 is linearly traversed by the touch sensing component 150 of the present invention and the touch sensing component of the comparative example (consisting of the array of capacitive sensing units 360) The capacitive sensing unit 60 of the present invention can obviously have a better linearity, and the touch position can be accurately sensed in the first direction 12 or the second direction 14, and thus the sensed track (Fig. 5) It can be closer to the linear track of the actual touch. In contrast, since the sensing capability of the touch sensing component of the comparative example is less than ideal in the first direction, the trajectory sensed by the touch sensing component of the comparative example (FIG. 6) has poor linearity. .

In addition, the touch sensing element and the capacitive sensing unit of the present invention are not limited to the structure of FIG. 2 . FIG. 7 is a cross-sectional view showing the capacitive sensing unit 60 of the present invention applied to another touch display device 200, and FIG. 8 is a cross-sectional view showing the capacitive sensing unit 60 of the present invention applied to another touch display device 400.

As shown in FIG. 7 , the touch device 170 can include an auxiliary substrate 10 and a touch sensing component 150 disposed on the auxiliary substrate 10 . The display panel 130 can include, for example, a first substrate 1011 and a second substrate 16 , and is disposed on the first A liquid crystal layer 18 between a substrate 11 and a second substrate 16. The auxiliary substrate 10 herein may be a plastic substrate that does not include a color filter, and the first substrate 11 may be a color filter substrate, but is not limited thereto. After the touch device 170 and the display panel 130 are respectively formed, the touch device 170 and the display panel 130 can be assembled into the touch display device 200 by any suitable means. For example, the touch device 170 is attached to the touch device 170 by using an optical glue or a frame glue. The surface of the display panel 130 is formed to form the touch display device 200.

As shown in FIG. 8 , the touch sensing component 150 of the present invention can also be formed directly on the inner side of the display panel 130 , that is, the touch sensing component 150 and the liquid crystal layer 18 are located on the same side of the substrate 10 to form the touch display device 400 . .

The touch sensing component 150 of the present invention can be directly formed on a substrate, such as the auxiliary substrate 10 or a substrate made of other materials, to form a touch sensing device, which is applied to other devices that require touch.

In summary, since the width of the peripheral electrode strip of the present invention is smaller than the width of the inner electrode strip, the distance between adjacent capacitive sensing units in the first direction is reduced, and the sense of the adjacent capacitive sensing unit is detected. The test signals have a large overlap area with each other, which can effectively improve the sensing sensitivity and increase the linearity of the touch display device and the touch device in the first direction.

While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

10, 11, 16. . . Substrate

12. . . First direction

14. . . Second direction

18. . . Liquid crystal layer

20, 320. . . Induction electrode

22,322. . . Main electrode strip

24, 324. . . Branch electrode

30, 330. . . Bridge wiring

32. . . First circuit first connection line

34. . . Second circuit second connection line

40, 340. . . Drive electrode

42,342. . . Peripheral electrode strip

42a. . . First peripheral part

42b. . . Second peripheral part

43a. . . First electrode strip

43b. . . Second electrode strip

43c. . . Third electrode strip

44,344. . . Inner electrode strip

60, 360. . . Capacitance sensing unit

70. . . control element

100. . . Touch display device

130. . . Display panel

150. . . Touch sensing component

170. . . Touch device

200. . . Touch display device

400. . . Touch display device

X1o, X2o, X3o, X4o, X5o, X3n. . . Polyline

W1. . . First width

W2. . . Second width

W3. . . width

FIG. 1 is a schematic diagram of a layout of a capacitive sensing unit according to a preferred embodiment of the present invention.

2 is a cross-sectional view of a capacitive sensing unit applied to a touch display device according to a preferred embodiment of the present invention.

3 is a schematic view showing the layout of a capacitance sensing unit of a comparative example.

4 is a schematic diagram of a sensing signal of the capacitive sensing unit in a first direction.

FIG. 5 is a schematic diagram of linearity testing of a capacitive sensing unit according to a preferred embodiment of the present invention.

FIG. 6 is a schematic diagram of the linearity test of the capacitance sensing unit of the comparative example.

FIG. 7 is a cross-sectional view of a touch display device according to another preferred embodiment of the present invention.

FIG. 8 is a cross-sectional view of a touch display device according to still another preferred embodiment of the present invention.

10. . . Substrate

12. . . First direction

14. . . Second direction

20. . . Induction electrode

twenty two. . . Main electrode strip

twenty four. . . Branch electrode

30. . . Bridge wiring

32. . . First circuit first connection line

34. . . Second circuit second connection line

40. . . Drive electrode

42. . . Peripheral electrode strip

42a. . . First peripheral part

42b. . . Second peripheral part

43a. . . First electrode strip

43b. . . Second electrode strip

43c. . . Third electrode strip

44. . . Inner electrode strip

60. . . Capacitance sensing unit

150. . . Touch sensing component

W1. . . First width

W2. . . Second width

Claims (22)

A touch display device includes: a display panel; a touch sensing component disposed on the display panel, the touch sensing component comprising: a plurality of sensing electrodes disposed substantially parallel to a first direction Each of the sensing electrodes includes a main electrode strip and a plurality of branch electrode portions, the branch electrode portions are connected to the main electrode strips, and a plurality of driving electrodes are disposed substantially parallel to the display panel along a second direction. Forming, a plurality of capacitive sensing units are interleaved with the sensing electrodes, and the driving electrodes of each of the capacitive sensing units include at least one peripheral electrode strip and at least one inner electrode strip, and the peripheral electrode portions are staggered, the periphery The electrode strip has a first width in the first direction, the inner electrode strip has a second width in the first direction, and the first width is smaller than the second width to be adjacent in the first direction The distance between the capacitive sensing units is reduced, and the linearity sensed by the touch sensing element in the first direction is increased, and the peripheral electrode strip is a U-shaped electrode. The touch display device of claim 1, wherein the ratio of the first width to the second width is substantially less than or equal to 0.8 and greater than or equal to 0.06. The touch display device of claim 1, wherein the ratio of the first width to the second width is substantially less than or equal to 0.7 and greater than or equal to 0.07. The touch display device of claim 1, wherein the first width is The ratio of the second width is substantially equal to or less than 0.66 and greater than or equal to 0.0941. The touch display device of claim 1, wherein the main electrode strips of each of the capacitive sensing units are linear electrode strips, and each of the linear electrode strips extends through the corresponding capacitive sensing unit. The touch display device of claim 1, wherein the capacitive sensing units are arranged in an array. The touch display device of claim 1, wherein the peripheral electrode strip of each of the capacitive sensing units is disposed between the sensing electrode and the adjacent capacitive sensing unit. The touch display device of claim 1, wherein each of the branch electrode portions is a branch electrode strip, and each of the branch electrode strips is substantially perpendicular to the main electrode strip. The touch display device of claim 1, wherein the peripheral electrode strips of each of the capacitive sensing units comprise at least a first peripheral portion and at least a second peripheral portion, respectively corresponding to the sensing The opposite sides of the electrode. The touch display device of claim 9, wherein the first peripheral portion of each of the peripheral electrode strips and the second peripheral portion are connected via a bridge. The touch display device of claim 1, wherein the main electrode strip of each of the capacitive sensing units spans the bridge. The touch display device of claim 1, wherein the display panel comprises a liquid crystal display panel, an organic light emitting display panel, an electrophoretic display panel or a plasma display panel. A touch device includes: a substrate; a plurality of sensing electrodes are disposed substantially parallel to the substrate along a first direction, each of the sensing electrodes includes a main electrode strip and a plurality of branch electrode portions, and the branch electrode portions Connecting the main electrode strips; and the plurality of driving electrodes are substantially parallel disposed on the substrate along a second direction, and forming a plurality of capacitive sensing units interleaved with the sensing electrodes, the driving electrodes of each of the capacitive sensing units The at least one peripheral electrode strip and the at least one inner electrode strip are alternately disposed with the branch electrode portions, wherein the peripheral electrode strip has a first width in the first direction, and the inner electrode strip has a first direction in the first direction a second width, wherein the first width is smaller than the second width, so that the distance between the adjacent capacitive sensing units in the first direction is reduced, and the linearity sensed by the touch sensing element in the first direction is increased. The peripheral electrode strip is a U-shaped electrode. The touch device of claim 13, wherein the ratio of the first width to the second width is substantially less than or equal to 0.8 and greater than or equal to 0.06. The touch device of claim 13, wherein the ratio of the first width to the second width is substantially less than or equal to 0.7 and greater than or equal to 0.07. The touch device of claim 13, wherein the ratio of the first width to the second width is substantially less than or equal to 0.66 and greater than or equal to 0.0941. The touch device of claim 13 , wherein the main electrode strip of each of the capacitive sensing units is a linear electrode strip, and each of the linear electrode strips extends through the corresponding capacitive sensing unit. The touch device of claim 13 , wherein the peripheral electrode strip of each of the capacitive sensing units is disposed between the sensing electrode and an adjacent one of the capacitive sensing units. The touch device of claim 13, wherein each of the branch electrode portions is a branch electrode strip, and each of the branch electrode strips is substantially perpendicular to the main electrode strip. The touch device of claim 13 , wherein the peripheral electrode strips of each of the capacitive sensing units comprise at least a first peripheral portion and at least a second peripheral portion respectively located at the corresponding sensing electrodes The opposite sides. The touch device of claim 20, wherein the first peripheral portion of each of the peripheral electrode strips and the second peripheral portion are connected via a bridge. The touch device of claim 13, wherein the main electrode strip of each of the capacitive sensing units spans the bridge.