TWI498800B - Electrode structures and lcd apparatus - Google Patents

Description

Electrode structure and liquid crystal display device

The present invention relates to a liquid crystal display device, and more particularly to an electrode structure and a liquid crystal display device.

With the development of touch technology, the touch input function is gradually integrated with the display device as part of the human-machine exchange. At present, the common touch in the industry is to make the touch sensing part into the liquid crystal display pixel, and the latter is combined with the latter, which is called in-line (also known as in-cell) technology. Among them, the touch sensing portion mostly uses a mutual capacitance to detect whether there is a touch by detecting a coupling capacitance between the driving electrode and the receiving electrode. Referring to FIG. 1A and FIG. 1B, FIG. 1A and FIG. 1B are schematic diagrams of mutual capacitance touch sensing. When a finger is touched, the coupling between the driving electrode and the receiving electrode is caused by the finger sucking away part of the electric field line. The capacitance Cm1 is smaller than the coupling capacitance Cm0 when there is no finger, and this change is used to detect whether there is a touch.

At present, the touch sensing layer in these product structures is generally realized by means of metal or indium tin oxide (ITO) bridging, and can refer to FIG. 2A and FIG. 2B together, and FIG. 2A is a conventional one. Schematic diagram of the electrode structure, FIG. 2B is an enlarged schematic view of the portion A of the metal or ITO bridge 23 connected in the electrode structure, since the driving electrode and the receiving electrode of the mutual capacitance are generally placed vertically, for example, the driving electrode can be on the X-direction channel 21 (or The receiving electrode) and the Y-direction channel 22 may be receiving electrodes (or driving electrodes). When the two are in the same horizontal plane and the Y-direction channel 22 is connected, the X-direction channel 21 needs to be connected by means of the bridge 23. Generally, the conductive material used for the bridge 23 is made of metal or ITO. In the manner of using the bridge 23, the impedance R of the X-direction channel 21 or the Y-direction channel 22 can be calculated based on the following formula:

Where R _□ is the square resistance of the X-direction channel 21 or the Y-direction channel 22, □ is the square resistance of the square resistance, L is the channel length, W _(L) is the channel width, and R _b is the impedance of the bridge. In general, since R _{□ is} large, the impedance of the entire channel is large, which is likely to cause distortion of the signal emitted by the driving electrode, thereby causing touch sensing failure. On the other hand, since the driving electrode and the receiving electrode are in the same layer, the electric field distribution between the driving electrode and the receiving electrode is mainly concentrated at the interval between the driving electrode and the receiving electrode, that is, the electric field distribution is concentrated at the position of the bridge 23, thereby causing electric field distribution. Not uniform.

In view of this, the embodiments of the present invention provide an electrode structure and a liquid crystal display device for reducing impedance of an electrode channel and solving the problem of uneven electric field distribution.

The present invention provides an electrode structure, which may include a first electrode layer, a second electrode layer, a first insulating layer, and a via. First electrode layer and The two electrode layers each include a first channel and a second channel; on the same electrode layer, the first channel and the second channel intersect, that is, the first channel and the second channel intersect on the first electrode layer, and the second electrode layer The upper first channel and the second channel intersect; a first insulating layer is disposed between the first electrode layer and the second electrode layer; and the first electrode layer is connected to the second electrode layer through the via hole.

In an embodiment, the present invention provides a liquid crystal display device including a color filter region, a touch sensing layer, and a second insulating layer disposed in sequence, the touch sensing layer includes the above electrode structure; and the color filter region is provided with a black matrix A metal mesh corresponding to the black matrix is further included under the second insulating layer.

It can be seen from the above technical solutions that the embodiment of the present invention provides an electrode structure and a liquid crystal display device, wherein the electrode structure adopts a double-layer electrode structure, and the conduction channel is increased, so that the electrode channel can be reduced compared with the single-layer channel. Impedance; Since the two-layer electrode structure is adopted, the electric field has more transmission and reception paths, and the electrode as a whole exhibits a more uniform electric field distribution than the existing electrode structure.

The detailed features and advantages of the present invention are set forth in the Detailed Description of the Detailed Description of the <RTIgt; </ RTI> <RTIgt; </ RTI> </ RTI> </ RTI> <RTIgt; The objects and advantages associated with the present invention can be readily understood by those skilled in the art.

21/22‧‧‧ channel

23‧‧‧Bridge

1‧‧‧First electrode layer

2‧‧‧Second electrode layer

3‧‧‧First insulation

31/31a/31b‧‧‧ first channel

32/32a/32b‧‧‧second channel

41‧‧‧First via

42‧‧‧Second via

51‧‧‧Color filter area

52‧‧‧Touch sensing layer

53‧‧‧Second insulation

54‧‧‧Black matrix

55‧‧‧Metal grid

A‧‧‧Local

1A and 1B are schematic views of the prior art mutual capacitance touch sensing principle.

Figure 2A is a schematic illustration of prior art electrode structures.

Fig. 2B is an enlarged view of a portion A of the electrode structure shown in Fig. 2A.

Fig. 3 is a schematic view showing an electrode structure of an embodiment of the present invention.

Fig. 4 is a schematic view showing the electrical connection of an electrode structure according to an embodiment of the present invention.

FIG. 5 is a cross-sectional structural diagram of a liquid crystal display device according to an embodiment of the present invention.

6A and 6B are schematic diagrams showing the position of a metal mesh in a liquid crystal display device according to an embodiment of the present invention.

Embodiments of the present invention provide an electrode structure and a liquid crystal display device for reducing impedance of an electrode channel and solving the problem of uneven electric field distribution.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following, and the embodiments described are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The details are described below separately.

Please refer to FIG. 3. FIG. 3 is a diagram of an embodiment of the present invention. A schematic diagram of an electrode structure, wherein the electrode structure comprises: a first electrode layer 1 and a second electrode layer 2, each of which includes a first channel 31 and a second channel 32; on the same electrode layer The first channel 31 and the second channel 32 intersect; a first insulating layer 3 is disposed between the first electrode layer 1 and the second electrode layer 2; the first electrode layer 1 is connected to the second electrode layer 2 through the via hole.

Wherein, the electrode structure of the embodiment of the invention is arranged in a double layer electrode structure.

In some implementations, the first channel 31 may be provided with a driving electrode, and the second channel 32 may be provided with a receiving electrode; or, in some implementations, the first channel 31 may be configured for receiving. The electrode is disposed on the second channel 32 as a driving electrode, that is, the electrode disposed on the first channel 31 can be connected to the driving signal, or can be connected to the sensing signal. Similarly, the electrode disposed on the second channel 32 can be connected to the driving signal. The sensing signal can also be connected, which is not specifically limited in the embodiment of the present invention. In addition, the driving electrode and/or the receiving electrode may be a mesh made of other conductive materials such as molybdenum aluminum, which is not specifically limited herein.

Please refer to FIG. 3 and FIG. 4 , wherein FIG. 4 is a schematic diagram of electrical connections of an electrode structure according to an embodiment of the present invention.

As shown in FIG. 4, when the first channel 31 and the second channel 32 are in the same horizontal plane on the first electrode layer 1, the first channels 31 are in direct communication, that is, in the case where the first channel 31 is connected. The second passage 32 is divided into two parts (the second passage 32a and the second passage 32b), wherein the second passage 32a and the second passage 32b can utilize metal or oxygen The indium tin ITO bridging method realizes the connection (not shown in the figure), and can be specifically implemented by referring to the connection diagram of the metal or ITO bridge 23 in the electrode structure as shown in FIG. 2B, which will not be specifically described herein.

As shown in FIG. 4, in some embodiments, on the second electrode layer 2, the second channels 32 are in direct communication, that is, in the case where the second channels 32 are connected, the first channel 31 is divided into two. The parts (the first channel 31a and the first channel 31b), the first channel 31a and the first channel 31b can be connected by means of metal or ITO bridging (not labeled in the figure). However, the invention is not limited thereto.

In some embodiments, on the first electrode layer 1, the second channels 32 are in direct communication, and the first channels 31 are connected by metal or ITO bridging.

In some embodiments, on the second electrode layer 2, the first channels 31 are in direct communication, and the second channels 32 are connected by metal or ITO bridging. It does not constitute a specific limitation of the embodiment of the invention.

Among them, the bridge can also be selected from other conductive materials, which are not specifically limited herein.

Referring to FIG. 3, a first insulating layer 3 is disposed between the first electrode layer 1 and the second electrode layer 2. The first insulating layer 3 is used to prevent the electrodes and the first channel 31 on the first electrode layer 1 from being disposed. The electrodes provided on the second channel 32 of the two electrode layers 2 are connected.

The first channel 31 on the first electrode layer 1 may be provided with a first via hole 41 and connected to the first channel 31 on the second electrode layer 2 through the first via hole 41; The second channel 32 is provided There is a second via hole 42 and is connected to the second channel 32 on the second electrode layer 2 through the second via hole 42. Here, if the driving electrode is disposed on the first channel 31 and the receiving electrode is disposed on the second channel 32, the first via hole 41 connects the driving electrodes on the first electrode layer 1 and the second electrode layer 2 The second via hole 42 connects the receiving electrodes on the first electrode layer 1 and the second electrode layer 2.

The two-layer electrode structure can be fabricated in the same manner as in the first embodiment. The process for making a single-layer electrode can be as follows: first, on the inner surface of the color filter, vacuum-sputtering or coating an insulating flat layer on the entire surface (this step is optional), and then vacuum-sputtering the metal and lithographic pattern on the entire surface, and then using The insulating layer is formed by plasma enhanced chemical vapor deposition, and then the via holes are etched. Finally, the metal is again vacuum-sputtered and the pattern is lithographically finished, that is, the process is terminated.

Therefore, since the electrode structure of the present invention has a conduction path, the channel impedance is lowered.

For example, in the first channel 31 in FIG. 3, the first channel 31 on the first electrode layer 1 is connected, and the first channel 31 is connected to the first through the via hole (the first via hole 41) in the direction of the first channel 31. The first channel 31 on the second electrode layer 2 is thus equivalent to a resistor connected in parallel with the direction of the first channel 31 of the upper surface (first electrode layer 1), so that the resistance becomes smaller than that of the single layer channel. . Further, since the electrode has a two-layer electrode structure and the electric field has a larger transmission and reception path, the electrode of the electrode structure of the present invention exhibits a more uniform electric field distribution with respect to the conventional electrode structure.

FIG. 5 is a liquid crystal display device according to an embodiment of the present invention. Schematic diagram of the cross section structure. In order to better understand the technical solution of the present invention, an embodiment of the present invention further provides a liquid crystal display device.

Referring to FIG. 5, the cross-sectional structure of the liquid crystal display device includes a color filter region 51, a touch sensing layer 52, and a second insulating layer 53 which are sequentially disposed. Among them, the touch sensing layer 52 includes the electrode structure as in the above embodiment. Among them, a black matrix 54 is disposed in the color filter region 51.

In some implementations, a metal grid 55 disposed corresponding to the black matrix 54 may also be disposed under the second insulating layer 53.

The network of the metal mesh needs to conform to the shape of the touch sensing pattern on the first channel 31 and the second channel 32 (ie, the driving electrode and the receiving electrode).

FIG. 6A and FIG. 6B are schematic diagrams showing the position of the metal mesh in the liquid crystal display device according to the embodiment of the present invention, wherein the positions of the first channel 31 and the second channel 32 are interchangeably arranged. That is, in some embodiments, the position of the first channel 31 shown in FIG. 6B may be the second channel 32, and the position where the second channel 32 is shown may be the first channel 31, and if The first channel 31 may be provided with a driving electrode, and the second channel 32 may be provided with a receiving electrode, or if the first channel 31 is provided with a receiving electrode, the second channel 32 is provided with a driving electrode. It is not specifically limited here.

It can be seen from the above that the embodiment of the present invention provides a liquid crystal display device having an electrode structure, wherein the electrode structure adopts a double-layer electrode structure, and the conduction channel is increased, so that the impedance of the electrode channel can be reduced compared with the single-layer channel; Because of the double-layer electrode structure, the electric field is collected. The hair path is more, and thus the electrode of the electrode structure of the present invention as a whole exhibits a more uniform electric field distribution with respect to the existing electrode structure.

The above is a detailed description of an electrode structure and a liquid crystal display device provided by the present invention. For those skilled in the art, according to the idea of the embodiment of the present invention, there are changes in the specific implementation manner and application range. The contents of this specification are not to be construed as limiting the invention.

Although the technical content of the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention, and any modifications and refinements made by those skilled in the art without departing from the spirit of the present invention are encompassed by the present invention. The scope of protection of the present invention is therefore defined by the scope of the appended claims.

1‧‧‧First electrode layer

2‧‧‧Second electrode layer

3‧‧‧First insulation

31‧‧‧First Passage

32‧‧‧second channel

41‧‧‧First via

42‧‧‧Second via

Claims (7)

An electrode structure comprising: a first electrode layer and a second electrode layer, the first electrode layer and the second electrode layer each comprise a first channel and a second channel, wherein the first electrode layer The first channel and the second channel intersect, the first channel and the second channel intersect on the second electrode layer; a first insulating layer is disposed between the first electrode layer and the second electrode layer; And a via hole, the first electrode layer is connected to the second electrode layer through the via hole, wherein a first via hole is disposed in the first channel on the first electrode layer, and the first via hole is passed through the first via hole The first channel is connected to the second electrode layer; a second via hole is disposed at the second channel of the first electrode layer, and the second via hole and the second channel on the second electrode layer are connection. The electrode structure according to claim 1, wherein the first electrode layer directly communicates with the first channel, and the second channel is connected by a metal or indium tin oxide bridge; the second electrode layer, the second The channels are directly connected to each other, and the first channel is connected by means of metal or indium tin oxide bridge. The electrode structure of claim 1, wherein the first electrode layer is directly connected to the second channel, and the first channel is connected by a metal or indium tin oxide bridge; on the second electrode layer, the second electrode layer First channel Directly connected, the second channel is connected by means of metal or indium tin oxide bridge. The electrode structure according to any one of claims 1 to 3, wherein a first driving electrode is disposed on the first channel, and a receiving electrode is disposed on the second channel. The electrode structure according to any one of claims 1 to 3, wherein a first receiving electrode is disposed on the first channel, and a driving electrode is disposed on the second channel. The electrode structure of item 5, wherein the driving electrode or the receiving electrode is a mesh made of a molybdenum-aluminum conductive material. A liquid crystal display device comprising: a color filter region, a touch sensing layer and a second insulating layer, wherein the touch sensing layer comprises the electrode structure according to any one of claims 1 to 6; the color filter region A black matrix is disposed in the middle; and a metal mesh disposed corresponding to the black matrix is further included under the second insulating layer.