CN203616734U - Embedded touch screen - Google Patents

Abstract

The utility model provides an embedded touch screen. The in-cell touch screen includes a first substrate and a first electrode layer arranged on the first substrate. The first electrode layer includes a plurality of mutually insulated touch driving electrodes, touch sensing electrodes and touch amplification electrodes. The touch amplification The electrodes are arranged in the gap area between the touch driving electrodes and the touch sensing electrodes. In the display phase, at least the touch driving electrodes and the touch sensing electrodes are applied with a common voltage. In the touch phase, the touch driving electrodes are applied with touch Drive signals, and the touch sensing electrodes output touch sensing signals. The built-in touch screen not only ensures the normal display of the built-in touch screen, but also improves the touch control of the built-in touch screen by setting the touch amplifying electrodes and switching the display and touch control of the touch amplifying electrodes through the switching control unit. control sensitivity and linearity.

Description

A built-in touch screen

technical field

The utility model relates to the field of display technology, in particular to an embedded touch screen.

Background technique

There are many sensing methods of touch screens, such as optical, microwave, resistive, capacitive and so on. Among them, capacitive sensing is the most widely used. Capacitive sensing includes self-capacitance sensing and mutual capacitance sensing. Compared with self-capacitance sensing, mutual capacitance sensing has the advantages of strong anti-interference ability, high sensitivity, multi-touch and recognition capabilities, so mutual capacitance sensing has become the current Mainstream touch screen sensing method.

At present, there are generally two types of mutual capacitance sensing touch screens: in-cell (In Cell) touch screens and non-embedded touch screens. Embedded touch screen means that the sensing electrodes and driving electrodes of the touch screen are arranged inside the display panel. In order to achieve a compact structure, the current embedded touch screen has a structure that shares a certain signal electrode when displaying and touching, such as display The common electrodes used during touch control can also be used as driving electrodes and sensing electrodes during touch control. The sensing electrodes and driving electrodes of the non-embedded touch screen are arranged outside or on the surface of the display panel. Since the electrodes for display and the electrodes for touch are independently set and controlled, although there is no interference between display and touch However, compared with the in-cell touch screen, which uses a touch display method that shares a certain signal electrode and makes the signal electrode time-division multiplexed for display and touch, the in-cell touch screen does not require additional touch screen preparation The process has little effect on the aperture ratio and light transmittance of the display pixel, so it has a good application prospect.

The mutual-capacitance touch screen includes driving electrode plates and sensing electrode plates. The driving electrode plates and sensing electrode plates are arranged at intervals in sequence. The connecting strips of the sensing electrodes arranged vertically are electrically connected; the connecting strips of the driving electrodes and the connecting strips of the sensing electrodes are intersected in space, so that a mutual capacitance is formed between the driving electrode board and the sensing electrode board during the touch driving process, and by detecting the mutual capacitance change to touch the touch screen.

However, due to the small variation of the coupling capacitance during touch, the sensitivity of the touch screen is low during touch, which is not conducive to the sensitive touch of the touch screen.

Utility model content

The utility model provides an embedded touch screen aiming at the above-mentioned technical problems existing in the prior art. In the embedded touch screen, by setting the touch amplifying electrodes and switching the touch amplifying electrodes through the switching control unit, the touch amplifying electrodes are used as common electrodes during display, thereby ensuring the normal display of the embedded touch screen; floating, thereby improving the touch sensitivity and linearity of the embedded touch screen.

The utility model provides an embedded touch screen, comprising: a first substrate and a first electrode layer arranged on the first substrate, the first electrode layer includes a plurality of mutually insulated touch drive electrodes, touch Sensing electrodes and touch amplifying electrodes, the touch amplifying electrodes are arranged between the touch driving electrodes and the touch sensing electrodes, and in the display stage, at least the touch driving electrodes and the touch sensing electrodes are applied The common voltage, in the touch stage, the touch drive electrodes are applied with touch drive signals, and the touch sense electrodes output touch sense signals.

Preferably, the touch screen further includes a switch control unit, the switch control unit is used to apply a common voltage to the touch amplification electrodes during the display phase; and to make the touch amplification electrodes suspended in the touch phase.

Preferably, the switching control unit includes a switching transistor and a switching control line, the gate of the switching transistor is electrically connected to the switching control line, and its source is electrically connected to the touch driving electrode or the touch sensing electrode. connected, and its drain is electrically connected to the touch amplifying electrode.

Preferably, one or more of the touch amplification electrodes are arranged in each of the gap regions, part or all of the touch amplification electrodes are provided with switching transistors corresponding to the touch amplification electrodes, and each The drains of the switching transistors are electrically connected to one touch amplification electrode, and the sources of all the switching transistors electrically connected to the touch amplification electrodes arranged in the same gap area are connected to the same touch amplification electrode. The touch driving electrodes or the same touch sensing electrodes are electrically connected.

Preferably, the extension direction of the switching control line is the same as the arrangement direction of the touch driving electrodes or the touch sensing electrodes, and the switching control line is electrically connected to the gates of the plurality of switching transistors.

Preferably, two adjacent touch driving electrodes are electrically connected through a first connection bar, and two adjacent touch sensing electrodes are electrically connected through a second connection bar, and the first connection The bars intersect with the second connecting bars in spatial position but are electrically isolated, and the first connecting bars or the second connecting bars are parallel to the switching control lines.

Preferably, there are one or more first connecting bars between two adjacent touch driving electrodes, and the first connecting bars are arranged so that the area of each of the touch driving electrodes is equal to the The extension line of one or more first connecting bars is the position where the boundary can be equally divided; the second connecting bar between two adjacent touch sensing electrodes is one or more, and the second connecting bar is one or more. The two connecting bars are arranged at positions where the area of each of the touch sensing electrodes can be equally divided by the extension line of the one or more second connecting bars.

Preferably, it also includes a display driving circuit and a touch driving circuit, the display driving circuit is electrically connected to the touch driving electrodes and the touch sensing electrodes, and is used for providing the touch driving electrodes and the touch sensing electrodes. The sensing electrodes provide display driving signals; the touch driving circuit is electrically connected to the touch driving electrodes or the touch sensing electrodes, and is used to provide touch driving for the touch driving electrodes or the touch sensing electrodes Signal.

Preferably, the switch control unit further includes a switch drive circuit, the switch drive circuit is electrically connected to the switch control line, and is used for providing a switch drive signal to the gate of the switch transistor.

Preferably, the touch driving electrodes, the first connecting bar, the touch amplifying electrode, the touch sensing electrode and the second connecting bar are located in the same plane, and the second connecting bar and the second connecting bar are located in the same plane. An insulating medium is arranged between the first connecting bars.

Preferably, in the display phase and the touch phase, the touch amplification electrodes are suspended.

Preferably, the gap region includes a plurality of gap regions, the extending direction of each gap region is the same as the arrangement direction of the touch driving electrodes or the touch sensing electrodes, and any two adjacent cells located in the same extending direction The touch amplification electrodes in the gap area are electrically connected.

Beneficial effects of the utility model: the built-in touch screen provided by the utility model not only improves the touch sensitivity of the built-in touch screen, but also improves the touch linearity of the built-in touch screen by setting the touch amplifying electrode; in addition , the utility model switches the touch amplifying electrode by setting a switching control unit, so that the touch amplifying electrode is used as a common electrode during display, thereby ensuring the normal display of the embedded touch screen; when touching, it is suspended, thereby improving the built-in The touch sensitivity and linearity of the touch screen.

Description of drawings

Fig. 1 is a structural schematic diagram of an embedded touch screen in Embodiment 1 of the present utility model;

Fig. 2 is a timing diagram of a driving scheme of the embedded touch screen in Fig. 1;

Fig. 3 is a timing diagram of another driving scheme of the embedded touch screen in Fig. 1;

FIG. 4 is a timing diagram of another driving scheme of the embedded touch screen in FIG. 1;

Fig. 5 is a structural schematic diagram of an embedded touch screen in Embodiment 2 of the present utility model;

Fig. 6 is a schematic structural diagram of an embedded touch screen in Embodiment 3 of the present utility model;

Fig. 7 is a schematic structural diagram of the built-in touch screen in Embodiment 4 of the present utility model;

FIG. 8 is a schematic structural diagram of an embedded touch screen in Embodiment 5 of the present invention.

The reference signs therein explain:

01. Driving electrode plate; 02. Sensing electrode plate; 1. Touch driving electrode; 11. First connecting bar; 2. Touch sensing electrode; 21. Second connecting bar; 3. Touch amplifying electrode; 31. Jump 4. Gap area; 5. Switching transistor; 6. Switching control line; 7. Display driving circuit; 8. Touch driving circuit; 9. Switching driving circuit.

Detailed ways

In order to enable those skilled in the art to better understand the technical solution of the utility model, a built-in touch screen of the utility model will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods. One touch unit of the touch screen is used as an example for illustration. In practical applications, the number of touch units in the touch screen is not limited and can be set according to needs.

Example 1:

This embodiment provides an in-cell touch screen, as shown in Figure 1, including: a first substrate and a first electrode layer disposed on the first substrate, the first electrode layer includes a plurality of mutually insulated touch drive electrodes 1 , touch sensing electrodes 2 and touch amplifying electrodes 3, the touch amplifying electrodes 3 are arranged between the touch driving electrodes 1 and the touch sensing electrodes 2, and in the display stage, at least the touch driving electrodes 1 and the touch sensing electrodes 2 When the common voltage is applied, in the touch stage, the touch driving electrode 1 is applied with a touch driving signal, and the touch sensing electrode 2 outputs a touch sensing signal. In this embodiment, the first electrode layer is a common electrode layer.

It should be noted that, in the display stage, the common voltage may or may not be applied to the touch amplification electrodes 3 .

In this embodiment, the touch driving electrodes 1 and the touch sensing electrodes 2 are arranged in parallel at intervals in sequence and form a gap area 4 in the arrangement direction, the touch driving electrodes 1 and the touch sensing electrodes 2 are alternately arranged in position, and the touch amplification The electrode 3 is arranged in the gap area 4, the touch driving electrode 1, the touch sensing electrode 2 and the touch amplifying electrode 3 are electrically isolated from each other, and a switching control unit is also included, and the switching control unit is electrically connected to the touch driving electrode 1, and At the same time, it is electrically connected to the touch amplifier electrode 3, and the switching control unit is used to apply a common voltage to the touch drive electrode 1, touch sense electrode 2 and touch amplifier electrode 3 in the display phase; A touch driving signal is applied to the electrode 1, so that the touch sensing electrode 2 outputs a touch sensing signal, and the touch amplifying electrode 3 is suspended in the air. Wherein, “floating” means that the touch amplification electrode 3 is not electrically connected, that is, the touch amplification electrode 3 is neither applied with a common voltage nor applied with a touch driving signal and a touch sensing signal.

The switching control unit switches the touch amplification electrode 3 in this way. On the one hand, the touch amplification electrode 3 is used as a common electrode when displaying, thereby ensuring the normal display of the embedded touch screen; The electrode 3 is suspended in the air during touch, which can increase the proportion of the unchangeable part of the mutual capacitance (ie intrinsic capacitance) formed by the mutual capacitance touch screen during touch, while reducing the variable part of the mutual capacitance (ie variable capacitance), thereby improving the touch sensitivity of the embedded touch screen. In addition, the setting of the touch amplification electrode 3 also improves the touch linearity of the embedded touch screen. At the same time, due to the suspended touch The amplifying electrode 3 will not form a mutual capacitance with the touch driving electrode 1 and the touch sensing electrode 2 during touch, and will not increase the load on the touch driving electrode 1 or the touch sensing electrode 2, thereby ensuring that the entire embedded The signal uniformity of the touch screen when touching.

In this embodiment, as shown in FIG. 1 , taking the shapes of both the touch driving electrodes 1 and the touch sensing electrodes 2 as rectangles as an example, the touch driving electrodes 1 are sequentially spaced horizontally (that is, along the width of the touch driving electrodes 1 ). direction), the touch sensing electrodes 2 are arranged at intervals vertically (that is, along the length direction of the touch driving electrodes 1 ), and each touch sensing electrode 2 arranged vertically is located between two adjacent touch driving electrodes 1 arranged horizontally. in the space between. It is set so that the touch driving electrodes 1 and the touch sensing electrodes 2 are staggered in position (that is, the adjacent touch driving electrodes 1 and touch sensing electrodes 2 are not completely symmetrically arranged in the vertical position), so that the touch The control driving electrode 1 and the touch sensing electrode 2 can form a mutual capacitance when touching, so as to realize touch control.

Wherein, two adjacent touch driving electrodes 1 are electrically connected through a first connection bar 11, and two adjacent touch sensing electrodes 2 are electrically connected through a second connection bar 21, and the first connection bar 11 and The second connecting bars 21 intersect spatially but are electrically isolated. The gap area 4 is located between the touch driving electrodes 1 and the touch sensing electrodes 2 arranged alternately, and the touch amplification electrodes 3 arranged in the gap area 4 do not intersect with the first connecting bar 11 and the second connecting bar 21 and overlapping. In this way, the touch amplification electrode 3 will not form a mutual capacitance with the touch driving electrode 1 and the touch sensing electrode 2 during touch, and will not increase the load on the touch driving electrode 1 or the touch sensing electrode 2. Therefore, the signal uniformity of the entire embedded touch screen during touch control is ensured, and the sensitivity of the embedded touch screen during mutual capacitance touch is also improved.

In this embodiment, a first connecting bar 11 is arranged between two adjacent touch driving electrodes 1 , and the first connecting bar 11 is set so that the area of each touch driving electrode 1 is connected by the first connection. The extension line of the bar 11 is the position where the boundary can be equally divided, that is, the area of the touch driving electrode 1 is divided into two equal parts by the extension line of the first connecting bar 11 as the boundary. Similarly, the second connecting bar 21 between two adjacent touch sensing electrodes 2 can also be one, and the second connecting bar 21 is set so that the area of each touch sensing electrode 2 is connected by the second connecting bar. The extension line of the bar 21 is the position where the boundary can be equally divided, that is, with the extension line of the second connecting bar 21 as the boundary, the area of the touch sensing electrode 2 is equally divided into two parts. Such arrangement makes the electrical signals input to the touch driving electrodes 1 and the touch sensing electrodes 2 relatively uniform when the touch driving electrodes 1 and the touch sensing electrodes 2 are driven by display or touch control. Increase drive speed.

In this embodiment, the switching control unit includes a switching transistor 5 and a switching control line 6. The gate of the switching transistor 5 is electrically connected to the switching control line 6, its source is electrically connected to the touch driving electrode 1, and its drain is electrically connected to the touch control electrode 1. The amplifying electrodes 3 are electrically connected. In this embodiment, each gap area 4 is provided with a touch amplification electrode 3, and the number of switching transistors 5 is the same as the number of touch amplification electrodes 3, that is, each touch amplification electrode 3 in this embodiment corresponds to a switch The drain of the switching transistor 5 is electrically connected to a touch amplifier electrode 3 . Such setting facilitates inputting the common electrode signal voltage to the touch amplifying electrode 3 through the switching transistor 5 during display, so that the in-cell touch screen can display normally. Of course, only part of the touch amplification electrodes 3 can be provided with corresponding switching transistors 5, which can also improve the touch sensitivity.

As shown in FIG. 1 , the extending direction of the switching control line 6 is the same as the arrangement direction of the touch driving electrodes 1 , and the switching control line 6 is electrically connected to the gates of a plurality of switching transistors 5 . As shown in FIG. 1 , multiple switch control lines 6 are provided, and the multiple switch control lines 6 are parallel to each other, and the switch control lines 6 are parallel to the first connection bar 11 . Each switching control line 6 is electrically connected to the gates of a plurality of switching transistors 5 arranged laterally on a straight line, so as to facilitate switching of all switching transistors 5 arranged on a straight line using the same switching control line 6 control.

It should be noted that the positions of the switching control line 6 and the switching transistor 5 in FIG. 1 are all schematic positions. In actual wiring, the switching control line 6 and the gate line for display overlap or are arranged in parallel in space. That is, the position where the switching control line 6 is located will be blocked by the black matrix, that is, the switching control line 6 will not be directly arranged inside the area where the pixel electrode is located, and will not affect the light transmission in the pixel area. The position of the switching transistor 5 can correspond to the position of the thin film transistor for display, that is, the position of the switching transistor 5 will also be blocked by the black matrix, which will not affect the transmission of light when the embedded touch screen is displayed.

In this embodiment, the embedded touch screen further includes a display driving circuit 7 and a touch driving circuit 8, and the display driving circuit 7 is electrically connected to the touch driving electrodes 1 and the touch sensing electrodes 2, and is used for providing touch driving electrodes 1 and touch sensing electrodes 2. The touch sensing electrodes 2 provide display driving signals. The touch driving circuit 8 is electrically connected to the touch driving electrode 1 for providing touch driving signals for the touch driving electrode 1 .

It should be noted that the touch driving electrode 1 is used as a driving electrode, and the touch driving circuit provides a touch driving signal for the driving electrode during touch; The electric signal, through sensing the driving signal on the driving electrode, performs mutual capacitance touch of the embedded touch screen, that is, there is a mutual capacitance between the sensing electrode and the driving electrode, and the sensing electrode senses the driving signal on the driving electrode, thereby controlling the embedded touch screen. The touch screen performs mutual capacitance touch. When the human body or other touch devices touch, the capacitance value of the mutual capacitance formed between the sensing electrode and the driving electrode changes, and further changes the electric field in it, so as to "perceive" the touch. Location.

In addition, the switch control unit also includes a switch drive circuit 9, the switch drive circuit 9 is electrically connected to the switch control line 6, and is used to provide a switch drive signal for the gate of the switch transistor 5, so that the switch transistor 5 can be switched between the display phase and the touch control phase. Provide the common electrode voltage for the touch amplifying electrodes in time-sharing or make the touch amplifying electrodes floating.

In this embodiment, the touch driving electrodes 1, the first connecting bar 11, the touch amplifying electrode 3, the touch sensing electrode 2 and the second connecting bar 21 are located in the same plane, and the second connecting bar 21 and the first connecting bar 11 An insulating medium is provided between them. Such an arrangement facilitates the electrical connection between the switching transistor 5 and the touch driving electrode 1 and the touch amplifying electrode 3, without increasing the complexity of the manufacturing process of the in-cell touch screen; in addition, it also facilitates the connection between the pixel electrode and the common electrode during display. An electric field is formed between them, and a mutual capacitance is formed between the touch driving electrodes 1 and the touch sensing electrodes 2 during touch control.

Based on the structure of the above-mentioned in-cell touch screen, the driving method of the in-cell touch screen includes: using the touch driving electrode 1, the touch sensing electrode 2 and the touch amplifying electrode 3 as common electrodes during display by switching the control unit; The control driving electrode 1 is used as a driving electrode during touch control, the touch sensing electrode 2 is used as a sensing electrode during touch control, and the touch amplifying electrode 3 is suspended in the air during touch control.

In this embodiment, the specific driving process of the embedded touch screen is:

When the in-cell touch screen is in the display state, the touch driving electrodes 1 and the touch sensing electrodes 2 are used as common electrodes; the display driving circuit 7 provides display driving signals for the touch driving electrodes 1 and the touch sensing electrodes 2 (that is, the common electrodes signal); the switching driving circuit 9 provides a high-level switching driving signal for the gate of the switching transistor 5, and the high-level switching driving signal makes the switching transistor 5 in an open state, that is, the source and drain of the switching transistor 5 are turned on, The display driving signal input to the touch driving electrode 1 is also input to the touch amplifying electrode 3 at the same time. That is, the display driving circuit 7 also performs display driving on the touch amplification electrode 3 through the switching transistor 5 . At this time, the touch driving electrode 1, the touch sensing electrode 2 and the touch amplifying electrode 3 are all used as common electrodes, and the voltages on the touch driving electrode 1, touch sensing electrode 2 and touch amplifying electrode 3 have the same voltage value, an electric field is formed between the common electrode and the pixel electrode, so that the in-cell touch screen can display normally.

When the embedded touch screen is in the touch state, the touch drive electrode 1 is used as the drive electrode for touch, and the touch sensing electrode 2 is used as the sense electrode for touch; the touch drive circuit 8 is the touch drive electrode 1 Provide touch driving signals. Since there is mutual capacitance between the touch driving electrodes 1 and the touch sensing electrodes 2, the touch sensing electrodes 2 only need to sense the driving signals on the touch driving electrodes 1 without applying any electrical signals. The switching drive circuit 9 provides a low-level switching drive signal for the gate of the switching transistor 5, and the low-level switching driving signal makes the switching transistor 5 in an off state, that is, the source and the drain of the switching transistor 5 are not conducted , therefore, the touch amplification electrode 3 has no electrical connection at this time, and is in a suspended state. Since the suspended touch amplifying electrode 3 will not form mutual capacitance with the touch driving electrode 1 and the touch sensing electrode 2 during touch, and will not increase the load on the touch driving electrode 1 or the touch sensing electrode 2, therefore When the embedded touch screen realizes touch control, the sensitivity and linearity of touch control are improved, and the signal uniformity of the entire embedded touch screen during touch control is ensured.

In this embodiment, the switching driving circuit 9 provides the same switching driving signal for all the switching transistors 5 respectively through a plurality of switching control lines 6 .

In addition, when displaying, the display driving circuit 7 performs unidirectional display driving or bidirectional display driving on the touch driving electrodes 1 and the touch sensing electrodes 2 . Among them, the unidirectional display driving is that the display driving circuit 7 starts from one end of the touch driving electrode 1 and the touch sensing electrode 2 (generally, one end of the entire touch driving electrode 1 or touch sensing electrode 2 arranged horizontally or vertically). terminal) to input the display driving signal; the bidirectional display driving is that the display driving circuit 7 receives from both ends of the touch driving electrode 1 and the touch sensing electrode 2 (generally, the entire touch driving electrode 1 or the entire touch driving electrode 1 arranged horizontally or vertically) The two opposite ends of the touch sensing electrode 2 ) simultaneously input the same display driving signal. Due to bidirectional display driving, the display driving signal input by the display driving circuit 7 to the touch driving electrode 1 (or touch sensing electrode 2) can be simultaneously transmitted from both ends of the touch driving electrode 1 (or touch sensing electrode 2). The touch driving electrode 1 (or touch sensing electrode 2) is charged. Compared with the unidirectional display driving, it is only charged from one end of the touch driving electrode 1 (or touch sensing electrode 2), so that the entire When the touch drive electrode 1 (or touch sensing electrode 2) is charged to a certain voltage value, the charging area of the former charging from one end is 1/2 of the latter, and the smaller the charging area, the smaller the attenuation of the signal, and the corresponding Generally speaking, the charging time of the former will be shortened by half compared with the latter, so bidirectional display driving can improve the display efficiency of the entire embedded touch screen and the uniformity of display signals during display than unidirectional display driving. During touch control, the touch driving circuit 8 performs unidirectional touch driving or bidirectional touch driving on the touch driving electrode 1 , and at the same time, switches the transistor 5 to make the touch amplifying electrode 3 floating. Among them, the unidirectional touch driving is that the touch driving circuit 8 inputs a touch driving signal from one end of the touch driving electrode 1 (generally, one end of the entire touch driving electrode 1 arranged horizontally or vertically); The driving is that the touch driving circuit 8 simultaneously inputs the same touch driving signal from both ends of the touch driving electrode 1 (generally, opposite ends of the entire touch driving electrode 1 arranged horizontally or vertically). Similarly, the bidirectional touch driver can improve the touch efficiency of the entire embedded touch screen and the uniformity of the touch signal during touch compared with the unidirectional touch driver.

In this embodiment, the touch driving circuit 8 provides a touch driving signal to the touch driving electrode 1 within a frame period. As shown in Figure 2, the touch driving signal is provided after one frame of screen is displayed, wherein the STV signal is the trigger signal for display start and touch end, the rising edge of the STV signal is the trigger signal for end touch, and the STV signal is the trigger signal for ending the touch. The falling edge of the signal is the trigger signal for starting the display; Gate(1)-Gate(n) is the gate drive signal for each row of pixels of the embedded touch screen when displaying; The switching driving signal provided by the gate; Tx(1)-Tx(M) is provided by the touch driving circuit 8 for each row of horizontally arranged touch driving electrodes 1 (a total of M rows of horizontally arranged touch driving electrodes 1 ) The touch driving signal, that is, the touch driving electrode 1 (that is, the driving electrode) is driven row by row when touching.

It should be noted that the touch driving signal can also be provided during the display of one frame, for example, a touch driving signal is provided after 1/2 frame is displayed to perform a touch control detection.

In addition, it should be noted that the touch driving circuit 8 may also provide touch driving signals to the touch driving electrodes 1 at intervals of L times within a frame period, wherein L is a positive integer, and 1<L<the total number of rows of pixels. Preferably, within a frame period, the L times of touch driving signals are provided at the same time intervals. Figure 3 and Figure 4 show the driving timing waveforms when L=2. In the scheme shown in FIG. 3 , in the first half frame period of the display, the touch screen is driven once; in the second half frame period of the display, the touch screen is driven once again. Or, in the solution shown in Figure 4, during the first half frame period of display, touch driving is performed on half of the touch screen (for example, the left half screen or the upper half screen); (such as the right half of the screen or the bottom half of the screen) for touch control. Figure 3 and Figure 4 only illustrate with L=2 as an example. It should be understood that the control of display and touch can be interspersed multiple times, either in time as shown in Figure 3 or as shown in Figure 3. As shown in Figure 4, the structure is interspersed, as long as the display and touch control can function normally through the coordinated control of the driving signals; of course, L can also be other positive integers greater than 2. Generally speaking, the more L The larger the number of touch drives in one frame period, the more times of touch detection, the higher the touch sensitivity, but at the same time, the higher the processing speed of the system is required. Therefore, in practical applications, it is necessary to obtain a relatively balanced number of touches L according to the touch sensitivity and system processing speed.

Example 2:

This embodiment provides an embedded touch screen. The difference from Embodiment 1 is that, as shown in FIG. 5 , the switching control unit is electrically connected to the touch sensing electrode 2 and is also electrically connected to the touch amplifying electrode 3 . The switching control unit is used to make the touch sensing electrode 2 act as a sensing electrode when touching, and make the touch amplifying electrode 3 suspended in the air when touching.

Correspondingly, the source of the switching transistor 5 is electrically connected to the touch sensing electrode 2 . The extending direction of the switching control line 6 is perpendicular to the arrangement direction of the touch driving electrodes 1 and the touch sensing electrodes 2 , and the switching control line 6 is parallel to the second connection bar 21 . Each switching control line 6 is electrically connected to gates of a plurality of switching transistors 5 vertically arranged in a straight line.

Other structures and settings of the embedded touch screen in this embodiment are the same as those in Embodiment 1, and will not be repeated here.

Based on the structure of the above-mentioned in-cell touch screen, the driving method of the in-cell touch screen is basically the same as that in Embodiment 1, and will not be repeated here. The difference is that when the embedded touch screen is in the display state, the switching drive circuit 9 provides a high-level switching drive signal for the gate of the switching transistor 5, and the signal makes the switching transistor 5 in an on state, and is input to the touch sensing electrode 2 The display driving signal is also input to the touch amplification electrode 3 at the same time, so that the touch amplification electrode 3 serves as a common electrode together with the touch driving electrode 1 and the touch sensing electrode 2 during display. When the embedded touch screen is in the touch state, the switching drive circuit 9 provides a low-level switching drive signal for the gate of the switching transistor 5, which makes the switching transistor 5 in a closed state, so that the touch amplifying electrode 3 is in a floating state .

Example 3:

This embodiment provides an in-cell touch screen. The difference from Embodiment 1-2 is that a plurality of touch amplification electrodes 3 are arranged in each gap area 4 , and the touch amplification electrodes 3 arranged in the same gap area 4 The sources of all switching transistors 5 electrically connected to 3 are electrically connected to the same touch driving electrode 1 or the same touch sensing electrode 2 .

As shown in FIG. 6 , on the basis of Embodiment 1, a structural schematic diagram of a plurality of touch amplification electrodes 3 is arranged on the in-cell touch screen. The arrangement of a plurality of touch amplifying electrodes 3 reduces the area of each touch amplifying electrode 3 in the gap area 4, thereby improving the charging efficiency of the touch amplifying electrodes 3 when displaying, thereby better ensuring the performance of the embedded touch screen. normal display.

Other structures and configurations of the embedded touch screen in this embodiment and the driving method of the embedded touch screen are the same as those in Embodiment 1, and will not be repeated here.

Example 4:

This embodiment provides an in-cell touch screen. The difference from Embodiments 1-3 is that there are multiple first connecting bars 11 between two adjacent touch driving electrodes 1, and the multiple first connecting bars 11 It is arranged at a position where the area of each touch driving electrode 1 can be equally divided by the extension line of the first connecting bar 11; the second connecting bar 21 between two adjacent touch sensing electrodes 2 is multiple The plurality of second connection bars 21 are arranged at positions where the area of each touch sensing electrode 2 can be equally divided by the extension line of the second connection bars 21 as a boundary.

As shown in FIG. 7 , on the basis of Embodiment 1, there are three first connecting bars 11 and two second connecting bars 21 in this embodiment. The increase of the first connecting bar 11 and the second connecting bar 21 can reduce the respective overall resistance of the first connecting bar 11 and the second connecting bar 21, thereby reducing the signal on the first connecting bar 11 or the second connecting bar 21 Attenuation, thereby making the signal of the embedded touch screen more uniform during display and touch, and improving the display and touch effect.

It should be noted that the number of first connecting bars 11 or second connecting bars 21 between two adjacent touch driving electrodes 1 or touch sensing electrodes 2 is not as many as possible, because the first connecting bars 11 The more the number of the second connection bar 21 is set, the unchangeable part of the mutual capacitance formed between the touch driving electrode 1 and the touch sensing electrode 2 (that is, the intrinsic capacitance) will increase, which will reduce the embedded Sensitivity of touch screen touches. Therefore, the number of the first connection bar 11 and the second connection bar 21 is set so that various technical parameters of the embedded touch screen can be relatively balanced to achieve a better configuration.

Other structures and configurations of the embedded touch screen in this embodiment and the driving method of the embedded touch screen are the same as those in Embodiment 1, and will not be repeated here.

Beneficial effects of Embodiment 1-4: The embedded touch screen in Embodiment 1-4 sets the touch amplification electrode and switches the touch amplification electrode through the switching control unit, so that the touch amplification electrode can be used as a common electrode when displaying , so as to ensure the normal display of the embedded touch screen; when the touch is suspended, the touch sensitivity and linearity of the embedded touch screen are improved. The driving electrodes and the touch sensing electrodes form a mutual capacitance, so that the load on the touch driving electrodes or the touch sensing electrodes will not be increased, thereby ensuring the signal uniformity of the entire in-cell touch screen during touch control. The embedded touch screen not only has good display effect, but also has high touch sensitivity, good linearity, and relatively uniform touch signals.

Example 5:

This embodiment provides an in-cell touch screen. The difference from Embodiments 1-4 is that the touch amplification electrodes are suspended in the air during the display stage and the touch stage. Among them, "floating" means that the touch amplification electrode 3 has no electrical connection, that is, in the display stage and the touch stage, the touch amplification electrode 3 is neither applied with a common voltage, nor applied with touch driving signals and touch sensing. Signal. Correspondingly, in this embodiment, there is no need to set up a switching control unit.

As shown in FIG. 8 , there are multiple gap regions 4, and the extension direction of each gap region 4 is the same as the arrangement direction of the touch sensing electrodes 2, and the touch amplification in any two adjacent gap regions 4 located in the same extension direction The electrodes 3 are electrically connected.

The setting of the touch amplification electrode 3 can reduce the unchangeable part of the mutual capacitance between the touch driving electrode 1 and the touch sensing electrode 2 during touch (that is, the intrinsic capacitance), and improve the mutual capacitance during touch. The proportion of the part that can be changed (that is, the variable capacitance) can improve the sensitivity of the touch screen during touch; meanwhile, the setting of the touch amplifying electrode 3 can also greatly improve the touch linearity of the touch screen.

It should be noted that, in this embodiment, the touch amplifying electrodes 3 located in any two adjacent gap regions 4 in the same extension direction are electrically connected through jumpers 31 . In the touch stage, the touch amplification electrode 3 is suspended (that is, no electrical signal is applied), so that the entire chain of touch drive electrodes connected by a plurality of touch drive electrodes 1 will be connected by jumpers 31 A touch amplification electrode chain is used as a springboard, forming a mutual capacitance with the touch sensing electrode 2 and the touch driving electrode 1 that the entire touch amplification electrode chain passes through, which is equivalent to increasing the load of the touch driving electrode 1. This will cause the touch sensing electrodes 2 that are close to the drive signal input end of the entire touch drive electrode chain to receive a stronger touch signal, while the touch sensor electrodes 2 that are farther from the drive signal input end of the entire touch drive electrode chain will receive a stronger touch signal. The touch signal received by the electrode 2 is relatively weak, so the touch signal uniformity of the entire touch screen is poor, which will also affect the touch effect of the touch screen to a certain extent.

Beneficial effects of Embodiment 5: The in-cell touch screen in Embodiment 5 not only improves the touch sensitivity of the in-cell touch screen by setting the touch amplifying electrodes and making the touch amplifying electrodes suspended in the display stage and the touch stage , and improve the touch linearity of the embedded touch screen.

It can be understood that, the above embodiments are only exemplary embodiments adopted to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present utility model, and these variations and improvements are also regarded as the protection scope of the present utility model.

Claims (12)

1. An in-cell touch screen, comprising: a first substrate and a first electrode layer disposed on the first substrate, characterized in that the first electrode layer includes a plurality of mutually insulated touch drive electrodes, Touch sensing electrodes and touch amplifying electrodes, the touch amplifying electrodes are arranged in the gap area between the touch driving electrodes and the touch sensing electrodes, and in the display stage, at least the touch driving electrodes and the touch amplifying electrodes A common voltage is applied to the touch sensing electrodes, and a touch driving signal is applied to the touch driving electrodes in a touch stage, and the touch sensing electrodes output touch sensing signals. 2. The in-cell touch screen according to claim 1, wherein the touch screen further comprises a switching control unit, the switching control unit is used to apply a common voltage to the touch amplification electrodes during the display phase; In the touch stage, the touch amplification electrodes are suspended in the air. 3. The embedded touch screen according to claim 2, wherein the switching control unit comprises a switching transistor and a switching control line, the gate of the switching transistor is electrically connected to the switching control line, and its source It is electrically connected with the touch driving electrodes or the touch sensing electrodes, and its drain is electrically connected with the touch amplifying electrodes. 4. The in-cell touch screen according to claim 3, wherein one or more touch amplification electrodes are arranged in each of the gap regions, and part or all of the touch amplification electrodes are arranged There are switching transistors corresponding to the touch amplifying electrodes, the drain of each switching transistor is electrically connected to one of the touch amplifying electrodes, and is connected to the touch amplifying electrodes arranged in the same gap area. The sources of all the switching transistors to which the electrodes are electrically connected are electrically connected to the same touch driving electrode or the same touch sensing electrode. 5. The in-cell touch screen according to claim 4, wherein the extension direction of the switching control line is the same as the arrangement direction of the touch driving electrodes or the touch sensing electrodes, and the switching control line It is electrically connected with the gates of a plurality of switching transistors. 6. The in-cell touch screen according to claim 5, wherein two adjacent touch driving electrodes are electrically connected through a first connection bar, and two adjacent touch sensing electrodes They are electrically connected through a second connecting bar, the first connecting bar and the second connecting bar intersect but are electrically isolated in space, the first connecting bar or the second connecting bar is connected to the switch The control lines are parallel. 7. The in-cell touch screen according to claim 6, wherein there are one or more first connecting bars between two adjacent touch driving electrodes, and the first connecting bars It is arranged at a position where the area of each of the touch driving electrodes can be equally divided by the extension line of the one or more first connecting bars; the area between two adjacent touch sensing electrodes There are one or more second connecting bars, and the second connecting bars are arranged so that the area of each of the touch sensing electrodes is equal to the boundary of the extension line of the one or more second connecting bars. point position. 8. The in-cell touch screen according to any one of claims 1-7, further comprising a display driving circuit and a touch driving circuit, the display driving circuit is connected to the touch driving electrodes and the touch The touch sensing electrodes are electrically connected to provide display driving signals for the touch driving electrodes and the touch sensing electrodes; the touch driving circuits are electrically connected to the touch driving electrodes for providing the touch sensing electrodes The driving electrodes provide touch driving signals. 9. The in-cell touch screen according to claim 8, wherein the switch control unit further comprises a switch drive circuit, the switch drive circuit is electrically connected to the switch control line, and is used for switching the transistor The gate of the switch provides the driving signal. 10. The in-cell touch screen according to claim 9, wherein the touch driving electrodes, the first connecting bars, the touch amplifying electrodes, the touch sensing electrodes and the second The connecting bars are located in the same plane, and an insulating medium is arranged between the second connecting bar and the first connecting bar. 11. The in-cell touch screen according to claim 1, characterized in that, in the display phase and the touch phase, the touch amplification electrodes are suspended in the air. 12. The in-cell touch screen according to claim 11, wherein the gap region comprises a plurality, and the extending direction of each gap region is the same as that of the touch driving electrode or the touch sensing electrode. The arrangement direction is the same, and the touch amplification electrodes in any two adjacent gap regions located in the same extension direction are electrically connected.

Images