TWI587199B - Display device - Google Patents

Description

Display device

The case relates to an electronic device. In particular, the present invention relates to a display device.

With the development of technology, display devices have been widely used in people's lives, such as smart mobile phones, desktop computers, notebook computers, and the like.

In some applications, the display device includes a touch module. The touch module is configured to receive the touch signal from the driving circuit to sense the touch of the user, and report the position information of the touches to the driving circuit. The touch module has a parasitic capacitance, and the parasitic capacitance has a negative effect on the touch signal of the input of the driving circuit to the touch module (such as slowing down the response of the touch signal or losing the potential of the touch signal) quasi). Therefore, how to design a display device with better characteristics and its touch module is an important research topic at present.

An embodiment of the present invention relates to a display device. According to an embodiment of the present disclosure, the display device includes a liquid crystal layer, a display array layer, a touch/common electrode layer, and a plurality of touch signal lines. The touch/common electrode layer is disposed between the liquid crystal layer and the display array layer. The touch/common electrode layer Includes a plurality of sensing pads. Each of the sensing pads includes a first electrode and a second electrode. The touch signal lines are electrically connected to the first electrodes of the sensing pads, and are used to provide a plurality of touch signals to the first electrodes of the sensing pads, and do not provide any touch signals to The second electrodes of the sensing pads.

By applying the above embodiment, the area of the portion of the sensing pad that receives the touch signal can be reduced to reduce the parasitic capacitance effect of the sensing pad.

10‧‧‧Drive circuit

10a‧‧‧Drive circuit

100‧‧‧ display device

100a‧‧‧ display device

100b‧‧‧ display device

100c‧‧‧ display device

102‧‧‧ third electrode

104‧‧‧Contact hole

110‧‧‧ polarizer

120‧‧‧Substrate

130‧‧‧Display array layer

140‧‧‧Touch/Common electrode layer

142-11~142-nm‧‧‧Sense pad

150‧‧‧Liquid layer

160‧‧‧Substrate

170‧‧‧ polarizer

TPL‧‧‧ touch signal line

PN‧‧‧ pin

PNa‧‧‧ pin

SED‧‧‧electrode unit

FD‧‧‧first electrode

SD‧‧‧second electrode

200‧‧‧How to operate

S1‧‧‧ steps

S2‧‧‧ steps

S3‧‧‧ steps

S4‧‧‧ steps

1A is a schematic diagram of a display device according to an embodiment of the present invention; FIG. 1B is a schematic diagram of a display device according to an embodiment of the present invention; FIG. 1C is a schematic view of a display according to an embodiment of the present invention; FIG. 2 is a schematic diagram of a display device according to another embodiment of the present invention; FIG. 3 is a schematic diagram of a display device according to another embodiment of the present invention; FIG. 4 is a schematic diagram of the display device according to another embodiment of the present disclosure; A flowchart of a method for operating a display device according to an embodiment; FIG. 5 is a schematic diagram of a display device according to another embodiment of the present invention; FIG. 6A is a diagram of a display device according to an embodiment of the present disclosure; Touch and FIG. 6B is a schematic diagram of a touch operation of the display device according to an embodiment of the present disclosure.

The spirit and scope of the present disclosure will be apparent from the following description of the embodiments of the present disclosure, which may be modified and modified by the teachings of the present disclosure. It does not depart from the spirit and scope of the disclosure.

"Electrical connection" as used herein may mean that two or more elements are in direct physical or electrical contact with each other, or indirectly in physical or electrical contact with each other, and "electrical connection" may also mean two or A plurality of component elements operate or operate with each other.

The terms "first", "second", etc., as used herein, are not intended to refer to the order or the order, and are not intended to limit the invention, only to distinguish between elements described in the same technical terms or operating.

The terms "including", "including", "having", "containing", etc., as used in this document are all open terms, meaning, but not limited to.

With respect to "and/or" as used herein, it is meant to include any or all combinations of the recited.

Regarding the directional terms used in this article, such as: up, down, left, right, front or back, etc., only refer to the direction of the additional schema. Therefore, the directional terminology used is used to illustrate that it is not intended to limit the case.

The terms used in this document, unless otherwise specified, generally have the usual meaning of each term used in the art, in the context of the disclosure, and in the particular content. Certain terms used to describe the disclosure are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in the description of the disclosure.

Also refer to Figure 1A-1C. In this embodiment, the display device 100 includes a driving circuit 10, polarizers 110, 170, substrates 120, 160, a display array layer 130, a touch/common electrode layer 140, a liquid crystal layer 150, and a touch signal line TPL. In this embodiment, the substrate 120 is disposed on the polarizer 110, the display array 130 is disposed on the substrate 120, the touch/share electrode layer 140 is disposed on the display array layer 130, and the liquid crystal layer 150 is disposed on the touch panel. Above the common electrode layer 140, the substrate 160 is disposed on the liquid crystal layer 150, and the polarizer 170 is disposed on the substrate 160. That is, the touch/share electrode layer 140 is disposed between the display array layer 130 and the liquid crystal layer 150. The display array layer 130 and the liquid crystal layer 150 are disposed between the substrates 120 and 160. The substrates 120 and 160 are disposed on the polarizer 110. Between 170. The touch signal line TPL can be disposed in the display array layer 130 and electrically connected to the pin PN of the driving circuit 10 one-to-one. In addition, the touch signal line TPL can be electrically connected to the touch/common electrode layer 140. It should be noted that in some embodiments, the touch signal line TPL can be set in different areas according to actual requirements, so the present invention is not limited to the above embodiment.

In an embodiment, the display device 100 further includes a color filter (not shown) disposed between the liquid crystal layer 150 and the substrate 160. However, the present invention is not limited thereto.

In an embodiment, the display array layer 130 may include each other A pixel electrode (not shown) and a transistor (not shown) are connected. The transistor is configured to receive and turn on according to the scan signal to provide a data voltage to the pixel electrode.

In this embodiment, the touch/common electrode layer 140 includes a plurality of sensing pads 142-11~142-nm, where m and n are natural numbers. The sensing pads 142-11~142-nm are arranged in a matrix. In this embodiment, each of the sensing pads 142-11~142-nm includes a first electrode FD and a second electrode SD. In an implementation side, the second electrode SD (for example, a center electrode) is disposed in the first electrode FD (for example, a peripheral electrode), that is, the first electrode FD is disposed to surround the second electrode SD. In an embodiment, the first electrode FD may be of a "mouth" type.

In the implementation side, the first electrode FD and the second electrode SD of the sensing pads 142-11~142-nm can both be used to form an electric field with the pixel electrodes in the display array layer 130 to control the liquid crystal molecules in the liquid crystal layer 150. The angle of twist.

In addition, in the embodiment, the first electrode FD of the sensing pads 142-11~142-nm can also perform touch sensing. The first electrode FD of the sensing pad 142-11~142-nm can be electrically connected to the touch signal line TPL one-to-one, and electrically connected to the pin PN of the driving circuit 10 through the touch signal line TPL. . The touch signal lines TPL can be used to provide the plurality of touch signals generated by the driving circuit 10 to the first electrodes FD of the sensing pads 142-11~142-nm, so that the sensing pads 142-11~142-nm The first electrode FD performs touch sensing.

On the other hand, the second electrode SD of the sensing pad 142-11~142-nm is not electrically connected to the touch signal line TPL, and the touch signal line TPL is not The touch signal generated by the driving circuit 10 is provided to the second electrode SD of the sensing pads 142-11~142-nm. That is, the second electrode SD of the sensing pads 142-11~142-nm is not used for touch sensing. In an embodiment, the second electrode SD of the sensing pads 142-11~142-nm can be floating.

Further, in an embodiment, the sensing pads 142-11~142-nm alternately perform display operations and touch operations. That is, the sensing pads 142-11~142-nm perform display operations during the first period (also referred to as display period), and perform touch operations during the subsequent second period (also referred to as touch period), and then The display operation is performed again in the third period (also referred to as the display period) (refer to FIG. 6A).

During the display operation (ie, during the display period), the first electrode FD and the second electrode SD of the sensing pads 142-11~142-nm are both used to form an electric field with the pixel electrodes in the display array layer 130 to control The twist angle of the liquid crystal molecules in the liquid crystal layer 150.

During the touch operation (ie, during the touch period), the first electrode FD of the sensing pads 142-11~142-nm receives the touch signals from the driving circuit 10 and the touch signal line TPL for touch control. Sensing. The second electrode SD of the sensing pad 142-11~142-nm is electrically connected to the touch signal line TPL, and does not receive the touch signal from the driving circuit 10 for touch sensing. In one embodiment, the second electrode SD of the sensing pads 142-11~142-nm is in a floating state.

Through the above settings, the touch sensing capability of the sensing pad 142-11~142-nm can be reduced without affecting (or slightly affecting) the touch sensing capability. The area of the sensing pad 142-11~142-nm for receiving the touch signal (such as the aforementioned first electrode FD).

Since the area of the portion of the sensing pad 142-11~142-nm for receiving the touch signal is positively related to the input capacitance value of the touch signal input sensing pad 142-11~142-nm, the sensing pad 142 The smaller the area of the portion for receiving the touch signal in -11~142-nm, the smaller the input capacitance value of the touch signal entering the sensing pad 142-11~142-nm. As a result, the negative effect of the parasitic capacitance in the display device 100 can be effectively reduced.

In addition, referring specifically to FIG. 1C, the sensing pad 142-11 is taken as an illustrative example. In the present embodiment, each of the sensing pads 142-11~142-nm includes a plurality of electrode units SED separated from each other. The electrode units SED are arranged in a matrix. The first portion of the electrode unit SED (for example, the portion located at the center of the sensing pad 142-11~142-nm) is divided into the first electrode FD and electrically connected to the touch signal line TPL. In one embodiment, the electrode unit SED in the first electrode FD of each of the sensing pads 142-11~142-nm is electrically connected to the same one of the touch signal lines TPL. The second portion of the electrode unit SED (for example, the portion located around the sensing pad 142-11~142-nm) is divided into the second electrode SD, and is not electrically connected to the touch signal line TPL, and is not The touch signal generated by the driving circuit 10 is received. Further, the electrode units SED in the second electrode SD may be arranged in a matrix form.

By disposing the second electrode SD in the first electrode FD, the first electrode FD for touch sensing can be uniformly densely attached to the display device 100. In this way, the negative influence on the overall touch sensing caused by the second electrode SD not receiving the touch signal can be reduced.

It should be noted that in the above embodiment, only the second electrode SD is disposed in the first electrode FD as an example. In fact, the second electrode SD may also be disposed around the side, the side, and/or the corner of the first electrode FD, and the present invention is not limited to the above embodiment. In addition, in this embodiment, the sensing pads 142-11~142-nm and the number and arrangement of the electrode units SED can be changed according to actual needs, so the present invention is not limited to the above embodiments.

FIG. 2 is a schematic diagram of a display device 100a according to another embodiment of the present disclosure. It should be noted that the display device 100a is substantially the same as the display device 100 of the embodiment in the first A-1C diagram, and the same portions will not be described herein.

In the present embodiment, the display device 100a further includes a control line CTL. The drive circuit 10a further includes a single pin PNa. In this embodiment, the control line CTL is electrically connected to the second electrode SD of the pin PNa and the sensing pad 142-11~142-nm. In one embodiment, the second electrodes SD of all the sensing pads 142-11~142-nm are electrically connected to each other through the control line CTL. For example, the electrode units SED of all the second electrodes SD are electrically connected to each other through the control line CTL.

In one embodiment, the second electrodes SD of the sensing pads 142-11-142-nm may be first grouped and electrically connected to each other, and then the second electrodes SD after being grouped are electrically connected to each other through the control line CTL. For example, in an embodiment, the sensing pads 142-11, 142-21 can be electrically connected to each other through a group connection line, and the sensing pads 142-12, 142-22 can be electrically connected to each other through a group connection line, The sensing pads 142-1m, 142-2m can be electrically connected to each other through a group connection line, and so on. Then, the sensing pad C10 is electrically connected to the sensing pads electrically connected to each other through the group connection line. 142-11-142-2m. By doing so, the number of control lines CTL can be saved.

In an embodiment, the pin PNa of the driving circuit 10a can be set to a floating state, a high impedance state, or a ground state (GND), but the present invention is not limited thereto. Other settings for the pin PNa are also within the scope of this case. In an embodiment, the pin PNa can be a general-purpose input/output (GPIO) pin, but the present invention is not limited thereto.

In an embodiment, the driving circuit 10a can generate the second electrode SD of the control signal to the sensing pads 142-11~142-nm through the control line CTL to make the second electrode of the sensing pad 142-11~142-nm. The voltage change of the SD is substantially the same as the voltage change of the first electrode FD of the sensing pads 142-11 to 142-nm.

For example, when the driving circuit 10a provides a touch signal to the first electrode FD of the sensing pad 142-11, the driving circuit 10a can provide a control signal corresponding to the touch signal to the sensing pad 142-11. The second electrode SD is such that the voltage of the first electrode FD of the sensing pad 142-11 and the second electrode SD of the sensing pad 142-11 are substantially the same.

In this way, the capacitive coupling effect caused by the difference in voltage between the first electrode FD of the sensing pad 142-11 and the second electrode SD of the sensing pad 142-11 can be avoided.

It should be noted that in the present embodiment, only the pin PNa is integrated on the drive circuit 10a as an example. In different embodiments, the pin PNa can be disposed on a control circuit (not shown) independent of the driving circuit 10a, and the control circuit can set the pin PNa to the different states described above, and can be provided in the present case. The control signal to the second electrode of the sensing pad 142-11~142-nm SD. Therefore, the present case is not limited to the foregoing embodiment.

FIG. 3 is a schematic diagram of a display device 100b according to another embodiment of the present disclosure. It should be noted that the display device 100b is substantially the same as the display device 100 of the embodiment in the first A-1C diagram, and the same portions will not be described herein.

In this embodiment, the first electrodes FD of the sensing pads 142-11~142-nm have different areas, and the second electrodes SD of the sensing pads 142-11~142-nm have different areas.

For example, the first electrode FD of the sensing pad 142-11 has a first area A1, and the first electrode FD of the sensing pad 142-1m has a second area A2. The first area A1 is smaller than the second area A2, and the distance between the first electrode FD of the sensing pad 142-11 and the driving circuit 10 (for example, the first electrode FD of the sensing pad 142-11 and the driving circuit 10 are touched). The length of the signal line TPL is greater than the distance between the first electrode FD of the sensing pad 142-1m and the driving circuit 10 (for example, the first electrode FD of the sensing pad 142-1m and the touch signal line TPL of the driving circuit 10) length).

In another aspect, the second electrode SD of the sensing pad 142-11 has a third area A3, and the second electrode SD of the sensing pad 142-1m has a fourth area A4. The third area A3 is smaller than the fourth area A4, and the distance between the second electrode SD of the sensing pad 142-11 and the driving circuit 10 is greater than the distance between the second electrode SD of the sensing pad 142-1m and the driving circuit 10.

That is, in the present embodiment, the sensing pad (such as the sensing pad 142-1m) that is closer to the driving circuit 10 has a larger first electrode FD and a smaller second electrode SD, which are farther away from the driving circuit. The sensing pad of 10 (such as sensing pad 142-11) has a smaller first electrode FD and a second larger area Electrode SD.

With the above arrangement, the first electrode FD having a long wiring distance can be made to have a small area to balance the resistance and capacitance load (RC loading) of the first electrode FD of the sensing pad 142-11 to 142-nm.

In an embodiment, each touch signal is input to the sensing pad 142-11~142-nm by adjusting the areas of the first electrode FD and the second electrode SD of the sensing pad 142-11~142-nm. The input impedances of the first electrodes FD are all substantially the same.

It should be noted that in some embodiments, display device 100b and display device 100a may be integrated with one another. That is, the area of the first electrode FD and the second electrode SD of the sensing pads 142-11 to 142-nm in the display device 100a may also vary with the distance from the driving circuit 10.

The operation method 200 of the display device in FIG. 4 will be provided below to provide more specific details of the present invention, but the present invention is not limited to the following embodiments.

It should be noted that this method of operation 200 can be applied to display devices that are identical or similar to the structures shown in Figures 1A-1C, 2, and 3. In order to simplify the description, the operation method 200 will be described below by taking the display device 100a in FIG. 2 as an example, but the present invention is not limited to this application.

In addition, it should be understood that the steps of the operation method 200 mentioned in the embodiment may be adjusted according to actual needs, and may be performed simultaneously or partially simultaneously, unless the order is specifically described.

Furthermore, in various embodiments, such steps may also be adaptively added, replaced, and/or omitted.

In step S1, the first of the sensing pads 142-11~142-nm The electrode FD enters a standby state (or a sleep state). At this time, the first electrode FD of the sensing pad 142-11~142-nm does not perform touch detection (for example, does not receive the touch signal). In an embodiment, the display circuit (not shown) in the display device 100b does not perform the image display operation at this time.

In step S2, the second electrode SD of the sensing pad 142-11~142-nm transmits the same control signal through the control line CTL for standby touch sensing. In an embodiment, the driving circuit 10a can provide the second electrode SD of the control signal to the sensing pads 142-11~142-nm by using a single pin PNa. In an embodiment, the standby touch sensing may be performed only by using the partial electrode unit SED of the second electrode SD of the sensing pad 142-11~142-nm. Therefore, the present invention is not limited to the above embodiment.

It should be noted that in step S2, since the standby touch sensing only needs to detect whether there is a touch, and does not need to know the exact position of the touch, the second electrode of the sensing pad 142-11~142-nm The SD can receive the same control signal for standby touch sensing. In addition, in an embodiment, since the driving circuit 10a (or any other alternative circuit) only needs to provide the second electrode SD of the control signal to the sensing pad 142-11~142-nm with a single pin PNa, It can reduce the power consumption of standby touch sensing.

In an embodiment, since the driving circuit 10a (or any other alternative circuit) supplies the control signal to the second electrode SD of the sensing pad 142-11~142-nm with only a single pin PNa, the driving circuit 10a A control signal with a higher voltage level can be provided for standby touch sensing. In this way, the sensitivity of the standby touch sensing can be increased in the case of low power consumption.

In step S3, the display device 100a utilizes a sensing pad The second electrode SD of 142-11 to 142-nm determines whether there is a touch on the display device 100a. If yes, go to step S4; if no, go back to step S2.

In step S4, when there is a touch on the display device 100a, the display device 100a wakes up the first electrode FD of the sensing pad 142-11~142-nm to make the sensing pad 142-11~142-nm The first electrode FD performs touch sensing again to detect the exact position of the touch. In an embodiment, at this time, the display circuit in the display device 100a can also perform the operation of displaying the image again.

FIG. 5 is a schematic diagram of a display device 100c according to another embodiment of the present disclosure. In the present embodiment, the display device 100c is substantially the same as the display device 100 of the embodiment in the first A-1C, and the same portions will not be described herein.

In the embodiment, the display device 100c further includes a plurality of third electrodes 102 disposed between the substrate 160 and the liquid crystal layer 150. When the first electrode FD of the sensing pad 142-11~142-nm enters a standby state (or a sleep state), the third electrode 102 can be used instead of the second electrode SD (or a part of the electrode thereof in the previous embodiment). Unit SED) receives the same control signal through control line CTL for standby touch sensing. For details of the standby touch sensing, refer to the previous paragraph, and therefore will not be described here.

In an embodiment, the third electrode 102 is electrically connected to the touch/common electrode layer 140 through the contact hole 104. However, the present invention is not limited thereto.

Referring to FIG. 6A and FIG. 6B, FIG. 6A is a schematic diagram of touch and display operations of the display device 100 according to an embodiment of the present invention. FIG. 6B is a diagram showing the touch operation of the display device 100 according to an embodiment of the present disclosure. intention. In this embodiment, the display device 100 can alternately perform display operations and touch operations using the sensing pads 142-11~142-nm. In each touch operation, the display device 100 can perform touch sensing of the first column of sensing pads 142-11~142-n1 to the mth column of sensing pads 142-1m~142-nm, and then The second electrode SD of the sensing pad 142-11~142-nm is used for noise sensing, so that the display device 100 can adjust the related control of the touch sensing according to the sensed noise.

With the above arrangement, since the second electrode SD of the sensing pad 142-11~142-nm does not perform touch sensing, additional charging and discharging waiting time due to noise sensing can be avoided.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and retouched without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

10‧‧‧Drive circuit

100‧‧‧ display device

142-11~142-nm‧‧‧Sense pad

TPL‧‧‧ touch signal line

PN‧‧‧ pin

FD‧‧‧first electrode

SD‧‧‧second electrode

Claims (9)

A display device includes: a liquid crystal layer; a display array layer; a touch/common electrode layer disposed between the liquid crystal layer and the display array layer, wherein the touch/common electrode layer comprises: a plurality of sensing The pads are arranged in a matrix, wherein each of the sensing pads includes: a first electrode; and a second electrode; and a plurality of touch signal lines electrically connected to the sensing pads The first electrodes of the sensing pads receive the plurality of touch signals from the touch signal lines for touch sensing, and the senses are The second electrodes of the pads do not receive any touch signals from the touch signal lines, wherein the first electrodes of the sensing pads have different areas, and the second portions of the sensing pads The electrodes have different areas. The display device of claim 1, wherein the second electrode of at least one of the sensing pads is disposed in the first electrode. The display device of claim 1, wherein the second electrode of at least one of the sensing pads is electrically connected to a driving circuit a pinch. The display device of claim 3, wherein the pin is set to a floating state, a high impedance state, or a ground state. The display device of claim 1, wherein the second electrode of at least one of the sensing pads is configured to receive a control signal to enable the second electrode of the one of the sensing pads The voltage change is substantially the same as the voltage change of the first electrode of the one of the sensing pads. The display device of claim 1, wherein the first electrode of a first one of the sensing pads has a first area, and the first electrode of a second one of the sensing pads has a second area, the first area is smaller than the second area, and a distance between the first electrode of the first one of the sensing pads and a driving circuit is greater than the first one of the sensing pads The distance between the first electrode of the two and the driving circuit. The display device of claim 1, wherein the second electrodes of the sensing pads are used to transmit a control when the first electrodes of the sensing pads enter a standby state. The line receives a control signal for a standby touch sensing. The display device of claim 1, further comprising: a plurality of third electrodes disposed between a substrate and the liquid crystal layer, In the case that the first electrodes of the sensing pads enter a standby state, the third electrodes are further configured to receive a control signal through a control line for performing a standby touch sensing. The display device of claim 1, wherein the second electrodes of the sensing pads are electrically connected to each other.