CN103064573B - A kind of capacitance touch screen - Google Patents

Abstract

The present invention relates to touch screen technology field, particularly a kind of capacitance touch screen, for improving the transmitance of capacitance touch screen.The invention discloses a kind of capacitance touch screen, comprising: substrate, the first electrode layer is on the substrate set, is arranged on the first insulation course on described first electrode layer, and is arranged on the second electrode lay on described first insulation course; Wherein, described first electrode layer is identical with the electrode pattern of described the second electrode lay, and position is relative.In the present invention, the first electrode layer is identical with the electrode pattern of the second electrode lay, and position is relative, reduces electrode block to the obstruction of light, thus improves the transmitance of capacitance touch screen.

Description

A capacitive touch screen

technical field

The present invention relates to the technical field of touch screens, and more specifically, relates to a capacitive touch screen.

Background technique

Capacitive touch screens are widely used in various electronic products due to their advantages of simple operation, long service life, and resistance to harsh external environments.

At present, a commonly used capacitive touch screen adopts a single-sided double-layer Indium Tin Oxide (Indium Tin Oxide, hereinafter referred to as ITO) structure. As shown in FIG. 1 , the capacitive touch screen of this structure includes: a first electrode block array 10 and a second electrode block array 20 arranged on the same layer and mutually insulated; wherein, the electrode blocks in the first electrode block array 10 are located in the second electrode block array. In the gaps of the electrode block array 20 , the second electrode blocks in the same column are sequentially connected with signals, and the first electrode blocks in the same row are connected with signals through the metal bridge 11 .

However, the transmittance of the touch screen with the above-mentioned structure is low, and in the manufacturing process, three mask mask designs are adopted, two of which are used to make the first electrode block array 10 and the second electrode block array 20, and one is used to make the first electrode block array 10 and the second electrode block array 20. The metal bridges 11 connecting the first electrode blocks in the same row are complicated and the yield rate is low.

Contents of the invention

The object of the present invention is to provide a capacitive touch screen for improving the transmittance of the capacitive touch screen.

In order to achieve the above object, the present invention provides the following technical solutions:

A capacitive touch screen, comprising: a substrate, a first electrode layer disposed on the substrate, a first insulating layer disposed on the first electrode layer, and a second electrode disposed on the first insulating layer layer; among them,

The electrode patterns of the first electrode layer and the second electrode layer are the same and opposite to each other.

Preferably, the first electrode layer is composed of a plurality of electrode blocks arranged in an array.

Preferably, the electrode block is an indium tin oxide (ITO) electrode block.

Preferably, the shape of the electrode block is rectangle, regular hexagon or rhombus.

Preferably, the first insulating layer is a resin layer.

Further, it also includes: a set of row scan lines and a set of column scan lines arranged on the substrate, the row scan lines are signal-connected to the first electrode layer, and the column scan lines are signal-connected to the second electrode layer .

Further, a protection layer disposed on the second electrode layer is also included.

In the capacitive touch screen provided by the present invention, the electrode patterns of the first electrode layer and the second electrode layer arranged on the substrate are the same, and the positions are opposite. Such arrangement can reduce the obstruction of light by each electrode block and improve the transparency of the capacitive touch screen. Overrate.

Description of drawings

FIG. 1 is an electrode pattern of a capacitive touch screen in the prior art;

2 is a cross-sectional view of a capacitive touch screen in an embodiment of the present invention;

FIG. 3 is a top view of the first electrode layer and the second electrode layer in FIG. 2 .

Detailed ways

In the existing capacitive touch screen, the first electrode block array 10 and the second electrode block array 20 are arranged in the same layer and are insulated from each other, and the electrode blocks in the first electrode block array 10 are located in the gaps of the second electrode block array 20, which affect the Through, resulting in a lower transmittance of the capacitive touch screen.

In view of this, the present invention provides an improved technical solution. The capacitive touch screen uses two electrode layers with the same electrode pattern, and the two electrode layers are opposite to each other, which reduces the obstruction of light by the electrode blocks, thereby improving the performance of the capacitive touch screen. transmittance.

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in FIG. 2, the capacitive touch screen provided by the present invention includes: a substrate 30, a first electrode layer 40 disposed on the substrate 30, a first insulating layer 50 disposed on the first electrode layer 40, and a first insulating layer 50 disposed on the first insulating layer. The second electrode layer 60 on the layer 50; wherein,

The electrode patterns of the first electrode layer 40 and the second electrode layer 60 are the same, and the positions are opposite.

In the capacitive touch screen provided in this embodiment, the electrode patterns of the first electrode layer 40 and the second electrode layer 60 are the same, as shown in FIG. Overlapping, such setting can reduce the obstruction of light by each electrode block and improve the transmittance of the capacitive touch screen.

Continuing to refer to FIG. 2, preferably, the first electrode layer 40 is composed of a plurality of electrode blocks arranged in an array, because the second electrode layer 60 has the same electrode pattern as the first electrode layer 40, so the second electrode layer 60 is also composed of an array It consists of a plurality of electrode blocks arranged in a shape.

Preferably, the above-mentioned electrode block is an ITO electrode block.

Preferably, the shape of the electrode block is a rectangle, a regular hexagon or a rhombus. As shown in FIG. 3 , in this embodiment, the shapes of the electrode blocks of the first electrode layer 40 and the second electrode layer 60 are both rectangular.

Preferably, the above-mentioned first insulating layer 50 is a resin layer. Compared with the use of point-shaped spacers in the prior art, uneven distribution of point-shaped spacers is prone to occur, resulting in inaccurate touch points and low light efficiency. , the resin layer is used to replace the support pad, which improves the accuracy of the touch point recognition of the capacitive touch screen, and improves the transmittance of the capacitive touch screen; in addition, the capacitive touch screen using the resin layer also has the advantages of thinning and integration.

Further, the above-mentioned capacitive touch screen also includes: a set of row scan lines 80 and a set of column scan lines 90 arranged on the substrate 30, the row scan lines 80 are signal-connected to the first electrode layer 40, and the column scan lines 90 are connected to the second electrode layer Layer 60 signal connections. Specifically, each row scanning line 80 is signal-connected to a row of first electrode blocks, and each column scanning line 90 is signal-connected to a column of second electrode blocks.

Further, the above-mentioned capacitive touch screen further includes a protective layer 70 disposed on the second electrode layer 60 ; used to protect the second electrode layer 60 and serve as a touch surface of the capacitive touch screen.

The above-mentioned capacitive touch screen is formed through the following steps:

First, a group of row scanning lines 80 and a group of column scanning lines 90 are made on the substrate 30, which are well known to those skilled in the art, and will not be described in detail here; then a layer is deposited on the substrate 30 by depositing a coating The ITO layer undergoes masking, exposure, development, etching, cleaning and other processes to finally form the first electrode layer 40 composed of M×N first electrode blocks.

Next, coat a layer of resin layer on the substrate 30 and the first electrode layer 40 to form the first insulating layer 50, which is used to isolate the first electrode layer 40 and the second electrode layer 60, and restore the touch point after being compressed and deformed. In the original state, compared with the dot-shaped support pads of the existing capacitive touch screen, the permeability of the resin layer is better, and uneven distribution does not occur, thereby improving the accuracy of identifying touch points of the capacitive touch screen.

Next, a coating film is deposited on the first insulating layer 50 to form an ITO layer, and after processes such as Mask, exposure, development, etching, and cleaning, a second electrode layer 60 composed of M×N second electrode blocks is finally formed. The shape of the electrode block is the same as that of the first electrode block, and their positions are opposite, that is, the projections of the second electrode block and the first electrode block on the substrate 30 coincide.

Finally, a protection layer 70 is covered on the second electrode layer 60 .

The capacitive touch screen provided by the above-mentioned embodiments recognizes the touch point by means of scanning. Specifically, a pulse scanning signal is first applied to one row of scanning lines, and the other row scanning lines are grounded. Add a pulse scan signal to the row scan line; then add a pulse scan signal to a column scan line, and ground the other column scan lines, and at the same time detect whether there is a capacitance change in the signal on the row scan line, and scan one column at a time. When all the row scan lines and After the scanning of the column scanning line is completed, the place where the capacitance changes the most is the coordinate position of the touch point.

To sum up, in the capacitive touch screen provided by the present invention, the electrode patterns of the first electrode layer and the second electrode layer are the same, and the positions are opposite, which reduces the obstruction of light by the electrode blocks, thereby improving the transmittance of the capacitive touch screen. In addition, the resin layer is used to replace the point-shaped support pads, which further improves the transmittance of the capacitive touch screen, and improves the accuracy of identifying touch points of the capacitive touch screen.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (6)

1. A capacitive touch screen, characterized in that it comprises: a substrate, a first electrode layer disposed on the substrate, a first insulating layer disposed on the first electrode layer, and a first insulating layer disposed on the first insulating layer. The second electrode layer on the layer; wherein, The electrode patterns of the first electrode layer and the second electrode layer are the same, and the projections on the substrate overlap; The capacitive touch screen also includes: a set of row scan lines and a set of column scan lines arranged on the substrate, the row scan lines are connected to the first electrode layer signal, and the column scan lines are connected to the second electrode layer signal connect. 2. The capacitive touch screen according to claim 1, wherein the first electrode layer is composed of a plurality of electrode blocks arranged in an array. 3. The capacitive touch screen according to claim 2, wherein the electrode blocks are indium tin oxide (ITO) electrode blocks. 4. The capacitive touch screen according to claim 3, wherein the shape of the electrode block is a rectangle, a regular hexagon or a rhombus. 5. The capacitive touch screen according to claim 1, wherein the first insulating layer is a resin layer. 6. The capacitive touch screen according to claim 1, further comprising a protection layer disposed on the second electrode layer.