TWI506493B - Touch display device - Google Patents

Description

Touch display device

The invention relates to a touch display device.

In order to overcome the interference of the noise generated by the liquid crystal display panel (Open Cell) on the touch panel, the touch display device based on the IPS (In-Plane Switching) technology is mostly in the liquid crystal display panel and the touch panel. A noise shielding layer is disposed between the circuit grounds to directly transmit the noise to the ground. The noise shielding layer can be made of a transparent conductive material such as indium tin oxide (ITO). At present, the way to ground the noise shielding layer is generally divided into the following two types:

(1) lapping with a frame of a touch display device through a conductive material such as a conductive aluminum foil;

(2) Grounding by means of silver paste or a small piece of conductive material between the color filter (CF) and the thin film transistor (TFT).

However, if the above two grounding methods are used, when the ADB (Advance Direct Bonding) process is used, since the Open Cell has been attached to the Touch Panel first, the overlap between the noise shielding layer and the grounding end has been blocked by the Touch Panel, and it cannot be confirmed. Whether the bonding between the conductive material such as the conductive aluminum foil or the silver plastic noise shielding layer is good. At the same time, after the ADB process, it is impossible to confirm whether the conductive material is disengaged from the grounding end, resulting in a product with poor shielding grounding.

In order to solve the above problems, it is necessary to provide a touch display device that can quickly detect whether the noise shielding layer is well grounded after the touch panel is attached to the liquid crystal display panel.

The touch display device of the present invention comprises: a touch panel, a liquid crystal display panel, and a noise shielding layer between the touch panel and the liquid crystal display panel, wherein the noise shielding layer is configured to generate the liquid crystal display panel through a grounding setting The noise is transmitted to the ground to prevent noise from interfering with the touch panel. The touch display device further includes at least two conductive strips disposed on the liquid crystal display panel and respectively connected to the noise shielding layer at different positions. Each of the conductive strips includes a protrusion protruding from the side of the liquid crystal display panel outside the liquid crystal display panel for measuring whether the noise shielding layer is well grounded after the touch panel is attached to the liquid crystal display panel.

Compared with the prior art, the touch display device of the present invention is connected to the noise shielding layer at different positions by providing at least two conductive strips, and the measuring device can be used after the touch panel is attached to the liquid crystal display panel. The potential of the conductive strip protruding from the portion of the liquid crystal display panel is separately measured, and it is convenient to detect whether the noise shielding layer is well grounded, thereby avoiding a product in which the noise shielding layer is poorly grounded.

100‧‧‧Touch display device

10‧‧‧Touch panel

11‧‧‧ Noise Masking Layer

20‧‧‧LCD panel

21‧‧‧ glass substrate

22‧‧‧Color filters

23‧‧‧Liquid layer

24‧‧‧TFT substrate

30‧‧‧First Conductive Tape

31‧‧‧Second conductive tape

301‧‧‧First protrusion

311‧‧‧Second protrusion

40‧‧‧Electrical material

FIG. 1 is a schematic diagram of a touch display device provided by the present invention.

2 is a front elevational view of a liquid crystal display panel of the touch display device in an embodiment.

3 is a front elevational view of a liquid crystal display panel of the touch display device in another embodiment.

4 is a rear view of the touch panel of the touch display device after being attached to the liquid crystal display panel.

Figure 5 is a cross-sectional view taken along line V-V of Figure 4;

Please refer to FIG. 1 , which is a schematic diagram of a touch display device 100 according to the present invention. For the convenience of description, only some of the components related to the present invention are shown in the drawings, and all the components of the touch display device 100 are not listed one by one. The touch display device 100 includes a touch panel 10 , a liquid crystal display panel (Open Cell ) 20 , and a noise shielding layer 11 between the touch panel 10 and the liquid crystal display panel 20 . The liquid crystal display panel 20 includes a glass substrate 21, a color filter 22, a liquid crystal layer 23, and a thin film transistor (TFT) substrate 24 which are stacked. The color filter 22 and the liquid crystal layer 23 are located between the glass substrate 21 and the TFT substrate 24. It should be understood that the touch display device 100 of the present invention further includes other components than the above components, such as a polarizer and a backlight module.

The noise shielding layer 11 is directly under the touch panel 10 and directly above the liquid crystal display panel 20, and is directly connected to the ground end to transmit the noise generated by the liquid crystal display panel 20 to the ground end to avoid the generation of the touch panel. interference. In this embodiment, the noise shielding layer 11 can be made of a transparent conductive material such as indium tin oxide (ITO). The noise shielding layer 11 is grounded by bonding a conductive material (such as a conductive aluminum foil or the like) to a frame of the touch display device 100, and is also transparent to the TFT on the color filter 22 and the TFT substrate. Ground the silver glue or a small piece of conductive material. It should be understood that in other embodiments, the noise shielding layer 11 can also be grounded through other feasible means.

As shown in FIG. 2 , the touch display device 100 further includes at least two conductive strips, such as a first conductive strip 30 and a second conductive strip 31 . The at least two conductive strips are disposed on the liquid crystal display panel 20 and are respectively connected to the noise shielding layer 11 at different positions, and each of the conductive strips protrudes from the liquid crystal display panel 20 side to the liquid crystal display panel 20 A protruding portion is used to measure whether the noise shielding layer 11 is well grounded. Preferably, each of the conductive strips is made of a transparent conductive material, for example, the same material as the noise masking layer 11.

Preferably, as shown in FIG. 2, the at least two conductive strips are disposed on the TFT substrate 24 of the liquid crystal display panel 20. The protruding portions of each of the conductive strips protrude from one side of the TFT substrate 24, thereby protruding from the entire liquid crystal display panel. In addition to 20, in order to measure whether the noise shielding layer 11 is well grounded.

In this embodiment, the touch display device 100 includes only the first conductive strip 30 and the second conductive strip 31 as an example.

As shown in FIG. 2, the first conductive strip 30 and the second conductive strip 31 are respectively located on different sides of the TFT substrate 24, for example, one side (gate side) for generating a scan signal for the TFT substrate 24 and one input signal signal. Side (source side). The first conductive strip 30 and the second conductive strip 31 are over the TFT substrate 24 and can be overlapped with the noise shielding layer 11 by means of a silver paste or a conductive material. The first conductive strip 30 includes a first protrusion 301 protruding beyond the TFT substrate 24 on the gate side of the TFT substrate 24. The second conductive strip 31 includes a second protruding portion 311 protruding from the other side of the TFT substrate 24 opposite to the gate side from the TFT substrate 24.

In an embodiment, the first conductive strip 30 and the second conductive strip 31 are spaced apart from each other. In another embodiment, as shown in FIG. 3, an insulator 32 is disposed between the first conductive strip 30 and the second conductive strip 31, so that the first conductive strip 30 and the second conductive strip 31 are physically connected through the insulator 32. . The first conductive strip 30, the insulator 32, and the second conductive strip 31 are integrally formed.

Referring to FIG. 4 , a rear view of the touch display device 100 after the touch panel 10 and the liquid crystal display panel 20 are attached. After the touch panel 10 is attached to the liquid crystal display panel 20, the first protruding portion 301 of the first conductive strip 30 and the second protruding portion 311 of the second conductive strip 31 are both protruded from one side of the TFT substrate 24. The first conductive strip 30 and the second conductive strip 31 are not completely shielded by the touch panel 10 and the liquid crystal display panel 20 except for the liquid crystal display panel 20. Therefore, the potentials at the first protruding portion 301 and the second protruding portion 311 can be measured using a measuring device such as a multimeter or the like, and the noise shielding layer 11 can be quickly judged by comparing whether the measured two potentials are equal. Is it grounded well?

Participating in Fig. 5 is a cross-sectional view taken along line V-V in Fig. 4. The first conductive strip 30 is disposed on a side of the TFT substrate 24 adjacent to the liquid crystal layer 23, and the first protruding portion 301 of the first conductive strip 30 protrudes from one side of the TFT substrate 24 outside the TFT substrate 24. And further protrudes beyond the entire liquid crystal display panel 20. The first conductive strip 30 is connected to the noise shielding layer 11 through the conductive material 40. Preferably, the conductive material 40 is a conductive paste such as silver paste. The connection manner of the second conductive strip 31 and the noise shielding layer 11 is similar to the manner in which the first conductive strip 30 and the noise shielding layer 11 are connected, and details are not described herein again.

In addition, when two or more conductive strips are respectively connected to the noise shielding layer 11 at different positions, the two or more conductive strips are disposed at any interval or physically connected through an insulator, and each of the conductive strips is electrically connected. The tape is connected to the noise shielding layer 11 through the conductive material 40.

In the present invention, the size of the protruding portion of each of the conductive strips may be predetermined according to the actual product. At the same time, in the subsequent process of the touch display device 100, the protruding portion of the liquid crystal display panel 20 may be cut off or the protruding portion may be bent away from the touch panel 10 to avoid the protruding portion. The impact of the process.

In summary, the present invention is connected to the noise shielding layer 11 at different positions by providing at least two conductive strips. When the touch panel 10 is attached to the liquid crystal display panel 20, the conductive device can be separately measured by using a measuring device. With the potential at the portion protruding from the liquid crystal display panel 20, it is convenient to detect whether the noise shielding layer 11 is well grounded, thereby avoiding a product in which the noise shielding layer 11 is poorly grounded.

In summary, the creation meets the requirements of the invention patent, and the patent application is filed according to law. However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiments, and those skilled in the art will be equivalently modified or changed according to the spirit of the present invention. It should be covered by the following patent application.

no

10‧‧‧Touch panel

20‧‧‧LCD panel

301‧‧‧First protrusion

311‧‧‧Second protrusion

Claims (10)

A touch display device includes: a touch panel, a liquid crystal display panel, and a noise shielding layer between the touch panel and the liquid crystal display panel, wherein the noise shielding layer is configured to transmit noise generated by the liquid crystal display panel through a grounding setting Passing to the ground to prevent noise from interfering with the touch panel, the touch display device further includes at least two conductive strips disposed on the liquid crystal display panel and respectively connected to the noise shielding layer at different positions, each conductive The tape includes a protrusion protruding from the liquid crystal display panel to the outside of the liquid crystal display panel for measuring whether the noise shielding layer is well grounded after the touch panel is attached to the liquid crystal display panel. The touch display device of claim 1, wherein the liquid crystal display panel comprises a laminated glass substrate, a color filter, a liquid crystal layer and a TFT substrate, and the at least two conductive strips are disposed on the TFT substrate. And the protruding portion of each of the conductive strips protrudes from one side of the TFT substrate and protrudes beyond the entire liquid crystal display panel. The touch display device of claim 2, wherein the at least two conductive strips comprise a first conductive strip and a second conductive strip respectively on different sides of the TFT substrate, the first conductive strip comprising a first protrusion, The second conductive strip includes a second protrusion, and the first protrusion and the second protrusion respectively protrude outside the TFT substrate on both sides of the TFT substrate. The touch display device of claim 3, wherein the first conductive strip and the second conductive strip are respectively disposed on the TFT substrate adjacent to two sides of the liquid crystal layer, and the first conductive strip and the second conductive strip pass through The conductive material is connected to the noise shielding layer. The touch display device of claim 3, wherein the first conductive strip is located on a side of the TFT substrate that generates a scan signal, and the second conductive strip is located on a side of the TFT substrate on which the data signal is input, The first protruding portion protrudes outside the TFT substrate from the side where the scanning signal is generated, and the second protruding portion protrudes outside the TFT substrate from the other side opposite to the side where the scanning signal is generated. The touch display device of claim 3, wherein the first conductive strip and the second conductive strip are spaced apart from each other. The touch display device of claim 3, wherein an insulator is disposed between the first conductive strip and the second conductive strip, and the first conductive strip and the second conductive strip are physically connected through the insulator. The touch display device of claim 1, wherein the two or more conductive strips are disposed at any interval or physically connected through an insulator. The touch display device of claim 1, wherein the conductive strip is made of a transparent conductive material. The touch display device of claim 9, wherein the conductive strip is made of indium tin oxide.