CN201107503Y - Touch display panel with electric field shielding layer - Google Patents

Abstract

A touch display panel with an electric field shielding layer is provided, wherein the electric field shielding layer is configured in the structure of the touch display panel. The electric field shielding layer is arranged between a liquid crystal layer of the liquid crystal display device and a glass substrate adjacent to the touch sensing layer and used for isolating signal interference between the touch sensing layer and the liquid crystal layer.

Description

Touch display panel with electric field shielding layer

technical field

The utility model relates to the design of a touch display panel, in particular to a touch display panel with an electric field shielding layer.

Background technique

Products that integrate touch panels into liquid crystal display devices have been widely used in monitors of portable notebook computers, input functions of portable personal mobile phones, various information home appliances, public information system equipment, and office automation settings. ..wait.

The known touch panel structure is mainly to coat a layer of transparent conductive layer (such as indium tin oxide ITO conductive layer) on the surface of a glass substrate (Glass Substrate). Furthermore, a layer of transparent conductive layer is also coated on the bottom surface of a film, which corresponds to the transparent conductive layer of the glass substrate, and a plurality of insulating spacers are arranged between the transparent conductive layer of the glass substrate and the transparent conductive layer of the film. dots for separating the transparent conductive layer from the transparent conductive layer. When the touch panel is operated by touch pressure, a touch pressure signal is generated and sent to a controller through the signal transmission line. The known touch panel structure also adopts a capacitive touch sensing structure.

In terms of the structure of the liquid crystal display device, a general thin film transistor (thin film transistor, hereinafter referred to as TFT) liquid crystal display device mainly includes a glass substrate, a liquid crystal layer, two polarizers, a color filter layer, a backlight, A pixel electrode located on the bottom surface of the liquid crystal layer, and a common electrode located on the top surface of the liquid crystal layer. The common electrode and the pixel electrode layer together form a liquid crystal driving electrode layer for driving the liquid crystal layer.

The structural design of another liquid crystal display device is called in-plane switching mode (IPS mode for short) liquid crystal display device. , which is formed between the glass substrate and the bottom surface of the liquid crystal layer, the liquid crystal driving electrode layer includes a plurality of pixel electrodes and a common electrode horizontally adjacent to the pixel electrodes for driving the liquid crystal layer.

Although the integrated product of the touch panel and the liquid crystal display device has great practicability, since the distance between the touch panel and the liquid crystal layer, pixel electrodes and common electrodes of the liquid crystal display device is very close in space, the touch signal and the display The driving signals of the liquid crystal layer often have the problem of mutual signal interference.

Furthermore, based on capacitive effect analysis, because the pixel electrode and common electrode of the liquid crystal display device and the touch sensing layer will form capacitive coupling (Capacity coupling) interference, in addition, the touch sensing layer from the liquid crystal display module will also generate high frequency signal interference. These interferences are a kind of noise interference to the capacitive coupling formed between the touch sensing layer and a part of the human body, which will affect the detection accuracy of the touch point position. The higher driving voltage used to increase the luminance further aggravates the problem of noise interference.

Whether it is a general thin film transistor liquid crystal display or a planar twist liquid crystal display, the above-mentioned signal interference problem will be encountered.

Contents of the invention

The main purpose of this utility model is to provide a touch display panel with an electric field shielding structure to isolate the noise between the touch panel and the liquid crystal display device, so that the detection of the touch position and the liquid crystal display are not interfered with by noise .

Another object of the present invention is to provide a planar twisted liquid crystal display device with an electric field shielding structure, so as to improve the noise isolation capability of the planar twisted liquid crystal display device.

In order to achieve the above purpose, the utility model provides a touch display panel with an electric field shielding layer, which includes:

a first glass substrate;

a second glass substrate;

a liquid crystal layer located between the first glass substrate and the second glass substrate;

a first polarizer, located on the bottom surface of the first glass substrate opposite to the liquid crystal layer;

A liquid crystal driving electrode layer, formed between the first glass substrate and the liquid crystal layer, the liquid crystal driving electrode layer includes a plurality of pixel electrodes and a common electrode horizontally adjacent to the pixel electrodes, for driving the liquid crystal layer;

a color filter layer formed on the bottom surface of the second glass substrate facing the liquid crystal layer;

a second polarizing plate located on the top surface of the second glass substrate opposite to the liquid crystal layer;

a touch sensing layer formed between the second glass substrate and the second polarizer for sensing a touch signal applied to the touch sensing layer;

An electric field shielding layer is located between the second glass substrate and the liquid crystal layer, and the electric field shielding layer is electrically connected to a predetermined potential for isolating signal interference between the touch sensing layer and the liquid crystal layer.

In the touch display panel with an electric field shielding layer, the electric field shielding layer is located between the color filter layer and the second glass substrate.

In the touch display panel with an electric field shielding layer, the electric field shielding layer is located between the color filter layer and the liquid crystal layer.

In the touch display panel with an electric field shielding layer, there is a planarization layer between the liquid crystal layer and the color filter layer, and the electric field shielding layer is located between the color filter layer and the planarization layer between.

The touch display panel with electric field shielding layer provided by the utility model also includes:

a first glass substrate;

a second glass substrate;

a liquid crystal layer located between the first glass substrate and the second glass substrate;

a first polarizer, located on the bottom surface of the first glass substrate opposite to the liquid crystal layer;

A pixel electrode layer, including a plurality of pixel electrodes, formed on the bottom surface of the liquid crystal layer;

A common electrode layer, including a plurality of common electrodes corresponding to the pixel electrode, together with the pixel electrode layer to form a liquid crystal driving electrode layer for driving the liquid crystal layer;

a color filter layer formed on the bottom surface of the second glass substrate facing the liquid crystal layer;

a second polarizing plate located on the top surface of the second glass substrate opposite to the liquid crystal layer;

a touch sensing layer formed between the second glass substrate and the second polarizer for sensing a touch signal applied to the touch sensing layer;

An electric field shielding layer is located between the second glass substrate and the common electrode layer, and the electric field shielding layer is electrically connected to a predetermined potential for isolating signal interference between the touch sensing layer and the liquid crystal layer.

In the touch display panel with an electric field shielding layer, the electric field shielding layer is located between the color filter layer and the second glass substrate.

The touch display panel with an electric field shielding layer, wherein the electric field shielding layer is located between the color filter layer and the common electrode layer, and there is an insulating layer between the electric field shielding layer and the common electrode layer layer.

The utility model compares the effect that known technology has:

Through the technical means adopted in the utility model, the electric field shielding layer can be used to isolate the noise between the liquid crystal display device and the touch sensing layer, so that the capacitive coupling formed by the touch sensing layer and a part of the human body is not disturbed , thereby improving the accuracy of touch position detection. Whether the electric field shielding layer of the present invention is arranged between the color filter layer of the liquid crystal display device and the glass substrate of the touch panel, or between the color filter layer and the liquid crystal layer, it only needs to be matched with a simple process. It can achieve a good electric field shielding effect without increasing the process burden. For the planar twisted liquid crystal display, the electric field shielding layer can be configured between the color filter layer and the planarization layer, or the electric field shielding layer can replace the function of the planarization layer, so that the process and material costs can not be increased. Under certain conditions, the electric field shielding effect is achieved.

Description of drawings

Fig. 1 shows the three-dimensional exploded view of the first embodiment of the utility model;

Fig. 2 shows the schematic cross-sectional view of each component in Fig. 1 after combination;

FIG. 3 further shows a cross-sectional view of the corresponding structure between the liquid crystal driving electrode layer and the liquid crystal layer in FIG. 2;

Fig. 4 shows a mesh electric field shielding layer with mesh or mesh structure;

Fig. 5 shows the schematic cross-sectional view of the second embodiment of the utility model;

Fig. 6 shows the schematic cross-sectional view of the third embodiment of the utility model;

Fig. 7 shows the three-dimensional exploded view of the fourth embodiment of the utility model;

Fig. 8 shows the schematic cross-sectional view of each component in Fig. 7 after combination;

FIG. 9 further shows a cross-sectional view of the corresponding structure between the liquid crystal driving electrode layer and the liquid crystal layer in FIG. 8;

FIG. 10 shows a schematic cross-sectional view of a fifth embodiment of the present invention.

Explanation of main component symbols in the attached drawings:

100, 100a, 100b, 100c, 100d touch display panel with electric field shielding layer

10, 10a Liquid crystal control structure

101 first glass substrate

102 liquid crystal layer

103 liquid crystal driving electrode layer

103a pixel electrode

103b common electrode

105 pixel electrode layer

105a pixel electrode

106 common electrode layer

106a common electrode

20 color filter structure

201 second glass substrate

202 color filter layer

203 electric field shielding layer

203a mesh electric field shielding layer

204 wire

205 planarization layer

206 insulating layer

30 first polarizer

40 second polarizer

50 diffuser plate

60 backlight

70 touch sensing layer

Detailed ways

The technical means adopted by the utility model to solve the problems of the known technology is to form an electric field shielding layer between the liquid crystal layer of the liquid crystal display device and the glass substrate of the touch panel to isolate the touch sensing layer from the liquid crystal Signal interference between layers. The location of the electric field shielding layer can be optionally located between the color filter layer of the liquid crystal display device and the glass substrate of the touch panel, or between the color filter layer and the liquid crystal layer. For the planar twisted liquid crystal display, the electric field shielding layer can be arranged between the color filter layer and the planarization layer, or the electric field shielding layer can replace the function of the planarization layer. The electric field shielding layer can adopt a continuous planar transparent conductive layer structure, or can be designed as a mesh structure. The electric field shielding layer can be connected to a ground potential, a potential with a predetermined voltage level, or a floating potential.

The specific embodiments adopted by the utility model will be further described by the following embodiments and accompanying drawings.

Referring to FIG. 1 , it shows a three-dimensional exploded view of the first embodiment of the present invention, and FIG. 2 shows a schematic cross-sectional view of the assembled components in FIG. 1 . As shown in the figure, the first embodiment of the present utility model has a touch display panel 100 with an electric field shielding layer, mainly composed of a liquid crystal control structure 10, a color filter structure 20, a first polarizer 30, a second polarizer plate 40 , a diffuser plate 50 , a backlight source 60 , and a touch sensing layer 70 .

The liquid crystal control structure 10 is disposed under the color filter structure 20 . In the first embodiment, an in-plane switching mode (IPS mode for short) liquid crystal display device is used as an embodiment for description. In this embodiment, the liquid crystal control structure 10 includes a glass substrate 101 , a liquid crystal layer 102 , and a liquid crystal driving electrode layer 103 . The liquid crystal driving electrode layer 103 is disposed on the top surface of the first glass substrate 101 .

FIG. 3 further shows a cross-sectional view of the corresponding structure between the liquid crystal driving electrode layer 103 and the liquid crystal layer 102 in FIG. 2 . As shown in the figure, the liquid crystal driving electrode layer 103 includes a plurality of pixel electrodes 103a and a common electrode 103b horizontally adjacent to the corresponding pixel electrodes. The pixel electrode 103 a and the common electrode layer 103 b jointly constitute a liquid crystal driving electrode layer that can be used to drive liquid crystal molecules of the liquid crystal layer 102 .

The bottom surface of a first glass substrate 101 (that is, the first glass substrate 101 is on the side opposite to the liquid crystal layer 102) is configured with a known first polarizer 30, and the bottom surface of the first polarizer 30 is configured with a diffusion plate 50 and a backlight. The source 60 is used to supply the light source of the touch display panel 100 from the backlight source 60 .

The color filter structure 20 includes a second glass substrate 201 disposed under the second polarizer 40, and a touch sensing layer 70 (such as a capacitive sensor) is arranged between the second glass substrate 201 and the second polarizer 40. touch sensing structure), the touch sensing layer 70 can sense the touch signal that the user presses on the touch sensing layer 70 through the second polarizer 40 . The touch signal sensed by the touch sensing layer 70 can be sent to a controller (not shown) through the signal transmission line to calculate the position coordinates of the user's touch point.

The color filter layer 202 is disposed on the bottom surface of the second glass substrate 201 . According to the first embodiment, an electric field shielding layer 203 is disposed between the second glass substrate 201 and the color filter layer 202 . The signal shielding function of the electric field shielding layer 203 can effectively isolate the signal interference between the liquid crystal layer 102 and the touch sensing layer 70 . Moreover, the electric field shielding layer 203 can be connected to a predetermined potential, such as a ground potential or a potential with a predetermined voltage level or a floating potential, via a wire 204 or an equivalent wiring. The bottom surface of the color filter layer 202 in this embodiment has a planarization layer 205 (Over-coating Layer).

The materials of the touch sensing layer 70 and the electric field shielding layer 203 can be ITO or any transparent film material with uniform resistance. Its formation method can use known techniques: for example, physical film forming process (physical film forming process) such as sputtering (sputtering), or chemical film forming process (chemical film forming process) such as chemical vapor deposition (CVD).

The electric field shielding layer 203 adopts a continuous planar structure (for example, a thin film is uniformly formed on the bottom surface of the second glass substrate 201 ), and the electric field shielding layer 203 can also be designed as a mesh or other structures with equivalent electric field shielding effects. For example, as shown in FIG. 4 , it shows a mesh electric field shielding layer 203 a having a mesh or mesh structure.

Referring to FIG. 5 , it shows a schematic cross-sectional view of a touch display panel 100 a with an electric field shielding layer according to a second embodiment of the present invention. The main structure of this second embodiment is similar to that of the aforementioned first embodiment, and the difference is that in the second embodiment, the electric field shielding layer 203 of the first embodiment is arranged on the color filter layer 202 of the color filter structure 20 and the liquid crystal control layer. The planarization layer 205 of the structure 10 can also effectively isolate the signal interference between the liquid crystal layer 102 and the touch sensing layer 70 .

Referring to FIG. 6 , it shows a schematic cross-sectional view of a touch display panel 100 b with an electric field shielding layer according to a third embodiment of the present invention. The main structure of this third embodiment is similar to that of the aforementioned second embodiment, the difference is that the electric field shielding layer 203 in the third embodiment is arranged on the color filter layer 202 of the color filter structure 20 and the liquid crystal of the liquid crystal control structure 10 Between the layers 102, the electric field shielding layer 203 not only serves as the signal interference isolation function between the liquid crystal layer 102 and the touch sensing layer 70, but also replaces the planarization layer 205 of the original liquid crystal control structure 10, which can further simplify the Process and material costs during fabrication (that is, disposition of the planarization layer 205 can be omitted).

The above embodiments are illustrated by using a planar twisted liquid crystal display device as an example. Of course, the present invention can also be applied to general liquid crystal display devices. For example, FIG. 7 shows a three-dimensional exploded view of the fourth embodiment of the present invention, and FIG. 8 shows a schematic cross-sectional view of the assembled components in FIG. 7 . As shown in the figure, the main components of the touch display panel 100c with an electric field shielding layer in the fourth embodiment of the present invention are also similar to the first embodiment, the difference is that this embodiment is applied to a general liquid crystal display device.

In this embodiment, a pixel electrode layer 105 is disposed on the bottom surface of the liquid crystal layer 102 in the liquid crystal control structure 10a. Also refer to FIG. 9 , which further shows a cross-sectional view of the corresponding structure between the liquid crystal driving electrode layer and the liquid crystal layer in FIG. 8 . The pixel electrode layer 105 includes a plurality of pixel electrodes 105a, and a common electrode layer 106 is disposed on the top surface of the liquid crystal layer 102, and includes a plurality of common electrodes 106a corresponding to the pixel electrodes 105a. The pixel electrode layer 105 and the common electrode layer 106 together constitute a liquid crystal driving electrode layer that can be used to drive the liquid crystal molecules of the liquid crystal layer 102 .

In this embodiment, an electric field shielding layer 203 is disposed between the second glass substrate 201 and the color filter layer 202 . The signal shielding function of the electric field shielding layer 203 can effectively isolate the signal interference between the liquid crystal layer 102 and the touch sensing layer 70 , and can also isolate the signal interference between the common electrode layer 106 and the touch sensing layer 70 .

Referring to FIG. 10 , it shows a schematic cross-sectional view of a touch display panel 100 d with an electric field shielding layer according to a fifth embodiment of the present invention. The main structure of this fifth embodiment is similar to that of the foregoing fourth embodiment, and the difference is that in the fifth embodiment, the electric field shielding layer 203 of the fourth embodiment is arranged on the color filter layer 202 of the color filter structure 20 and the liquid crystal control layer. An insulating layer 206 is provided between the common electrode layer 106 of the structure 10 a and between the electric field shielding layer 203 and the common electrode layer 106 . This structure can also effectively isolate the signal interference between the liquid crystal layer 102 and the touch sensing layer 70 , and can also isolate the signal interference between the common electrode layer 106 and the touch sensing layer 70 .

The above narration is only a description of the preferred embodiments of the present utility model, and those skilled in the art can make other various improvements based on the above description, but these changes still belong to the creative spirit of the present utility model and the scope of the applied claims .

Claims (7)

1, a kind of touch-control display panel with electric field shielding layer is characterized in that, comprising:

One first glass substrate;

One second glass substrate;

One liquid crystal layer, the position is between this first glass substrate and this second glass substrate;

One first Polarizer, the position is in the bottom surface of this first glass substrate in contrast to this liquid crystal layer;

One LC driving electrode layer is formed between this first glass substrate and this liquid crystal layer, and this LC driving electrode layer includes plurality of pixel electrodes and flatly adjacent common electrode corresponding to this pixel electrode;

One chromatic filter layer is formed on the bottom surface of this second glass substrate towards this liquid crystal layer;

One second Polarizer, the position is at the end face of this second glass substrate in contrast to this liquid crystal layer;

One touch-control sensing layer is formed between this second glass substrate and this second Polarizer;

One electric field shielding layer, the position is between this second glass substrate and this liquid crystal layer, and this electric field shielding layer is electrically connected to a predetermined potential.

2, the touch-control display panel with electric field shielding layer as claimed in claim 1 is characterized in that, wherein this electric field shielding layer position is between this chromatic filter layer and this second glass substrate.

3, the touch-control display panel with electric field shielding layer as claimed in claim 1 is characterized in that, wherein this electric field shielding layer position is between this chromatic filter layer and this liquid crystal layer.

4, the touch-control display panel with electric field shielding layer as claimed in claim 1 is characterized in that, wherein also have a planarization layer between this liquid crystal layer and this chromatic filter layer, and this electric field shielding layer position is between this chromatic filter layer and this planarization layer.

5, a kind of touch-control display panel with electric field shielding layer is characterized in that, comprising:

One first glass substrate;

One second glass substrate;

One liquid crystal layer, the position is between this first glass substrate and this second glass substrate;

One first Polarizer, the position is in the bottom surface of this first glass substrate in contrast to this liquid crystal layer;

One pixel electrode layer includes plurality of pixel electrodes, is formed on the bottom surface of this liquid crystal layer;

The community electrode layer includes a plurality of common electrodes corresponding to this pixel electrode, with the common LC driving electrode layer of forming of this pixel electrode layer;

One chromatic filter layer is formed on the bottom surface of this second glass substrate towards this liquid crystal layer;

One second Polarizer, the position is at the end face of this second glass substrate in contrast to this liquid crystal layer;

One touch-control sensing layer is formed between this second glass substrate and this second Polarizer;

One electric field shielding layer, the position is between this second glass substrate and this common electrode layer, and this electric field shielding layer is electrically connected to a predetermined potential.

6, the touch-control display panel with electric field shielding layer as claimed in claim 5 is characterized in that, wherein this electric field shielding layer position is between this chromatic filter layer and this second glass substrate.

7, the touch-control display panel with electric field shielding layer as claimed in claim 5 is characterized in that, wherein this electric field shielding layer position and has an insulation course between this electric field shielding layer and this common electrode layer between this chromatic filter layer and this common electrode layer.

Images