TWI485587B - In-cell touch display and electronic apparatus thereof - Google Patents

Description

In-cell touch display and electronic device thereof

The invention relates to a touch display, and in particular to an in-cell touch display and an electronic device thereof.

Most traditional touch displays are external touch displays. The external touch display is composed of a touch panel and a liquid crystal display panel, wherein the touch panel is attached to the liquid crystal display panel. The touch panel has a plurality of touch driving lines and a plurality of touch sensing lines, and the control unit transmits a plurality of touch driving signals to the plurality of touch driving lines, and the plurality of touch sensing lines are used to receive the plurality of touch lines. The sensing signal is controlled, and the plurality of touch sensing signals are sent to the control unit, so that the control unit determines the at least one touch position accordingly.

Since the external touch display is composed of a touch panel and a liquid crystal display panel, it has three or more layers of glass, so it is thick and heavy, and does not conform to the trend of light and thin products.

In addition, although the architecture of the in-cell touch display is proposed, the touch sensing layer is directly embedded in the liquid crystal display panel. However, if the touch sensing layer uses a transparent conductive layer as the touch sensing line and the touch driving line, the penetration rate of the in-cell touch display will decrease; on the contrary, if the touch sensing layer is not transparent When the conductive layer is used as the touch sensing line and the touch driving line, the aperture ratio of the in-cell touch display will be reduced.

The embodiment of the invention provides an in-cell touch display, and the in-cell touch display comprises a thin film transistor substrate and a control unit. The thin film transistor substrate includes a plurality of gate lines and a plurality of data lines. A plurality of gate gathers extend along the first axial direction and are arranged in parallel with each other. Multiple data lines along The second axis extends and is arranged parallel to each other. A plurality of data lines are interleaved with a plurality of gate lines to define a plurality of pixel regions. The control unit is electrically coupled to the plurality of gate lines and the plurality of data lines, and is configured to enable the plurality of data lines to operate in a display mode and a touch mode in a time division manner. In the display mode, the control unit transmits a plurality of data signals to the plurality of data lines; in the touch mode, the control unit receives the plurality of touch sensing signals on the plurality of data lines.

The embodiment of the invention provides an electronic device, which includes an electronic device body and the in-cell touch display, wherein the in-cell touch display is electrically connected to the electronic device body.

In summary, the in-cell touch display provided by the embodiment of the present invention does not require an additionally designed touch sensing line, and does not even need an additional designed touch driving line, so the embedded control display can maintain a certain The aperture ratio and transmittance, and can also not change the process of the thin film transistor.

The detailed description of the present invention and the accompanying drawings are to be understood by the claims The scope is subject to any restrictions.

1 and FIG. 2, FIG. 1 is a plan view of a thin film transistor substrate of an in-cell touch display according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of a stack structure of an in-cell touch display device according to an embodiment of the invention. The in-cell touch display 1 includes a thin film transistor substrate, a liquid crystal layer 113 (not shown in FIG. 1 ), a color filter substrate (not shown in FIG. 1 ), and a control unit 21 , wherein the liquid crystal layer is located on the thin film transistor substrate and The color filter substrate (consisting of the color filter 114 and the glass 115 of FIG. 2) is located on the thin film transistor substrate. In this embodiment, the thin film transistor substrate includes a whole layer of common electricity The pole 110 (not shown in FIG. 1 ), the plurality of pixel electrodes 112 , the plurality of touch driving lines 102 , the plurality of gate lines 104 , and the plurality of data lines 107 and the control unit 21 . The common electrode 110, the plurality of pixel electrodes 112, the plurality of touch driving lines 102, the plurality of gate lines 104, and the plurality of data lines 107 are located at different layers from each other. It should be noted that the control unit 21 controls the plurality of data lines 107 to transmit a plurality of data signals in the display mode to the plurality of pixel electrodes 112 in a time division multiplexing manner, and receives the plurality of touch sensing modes in the touch mode. signal. That is, the control unit 21 performs an operation of transmitting a plurality of data signals to the plurality of pixel electrodes 112 through the plurality of data lines 107 at different time points, and an operation of receiving the plurality of touch sensing signals.

The plurality of gate lines 104 extend along a first axial direction (e.g., the X-axis) and are arranged in parallel with each other. A plurality of data lines 107 extend along a second axial direction (e.g., the Y-axis) and are arranged in parallel with each other. The plurality of gate lines 104 and the plurality of data lines 107 intersect on a plane to define a plurality of pixel regions, and the plurality of pixel electrodes 112 are located in the plurality of pixel regions. The plurality of touch driving lines 102 extend along the first axial direction and are arranged in parallel with each other and are arranged alternately with the data lines 107.

In this embodiment, the plurality of touch driving lines 102 are not overlapped on the gate line 104 on the plane, wherein the two touch driving lines 102 are connected to receive the same touch driving signal TX(i), and wherein The two touch driving lines 102 are connected to receive the same touch driving signal TX(i+1). In this embodiment, two touch driving lines 102 are connected to receive the same touch driving signal TX(i), and two or more touch driving lines 102 are connected to receive the same touch driving signal. The plurality of touch driving lines are connected to receive the same touch driving signal to make a large change with the sensing capacitance value of the data line 107, and it is easy to determine whether there is a touch action, and the driving component for providing the touch driving signal can be reduced. The number of pins is used to achieve cost savings. In other realities In the embodiment, each touch driving line 102 can also receive a touch driving signal separately, so the invention is not limited thereto.

Please note that the design of the plurality of touch driving lines 102 on the plane to avoid the gate lines 104 is not intended to limit the present invention. In this embodiment, the touch driving line 102 can be a transparent conductive electrode, such as ITO, IZO, etc. Since the transparent conductive electrode has light transmissivity, it can be vertically stacked with the pixel electrode 112 as shown in FIG. Opening ratio. In other embodiments, the touch driving line 102 can be an opaque conductive electrode, such as Cu, Al, etc., which can be vertically stacked with the gate line 104 without affecting the aperture ratio. The touch driving line 102 can also be a transparent conductive electrode and vertically overlap the gate line 104, or the touch driving line 102 can be vertically stacked with the opaque conductive electrode and the pixel electrode 112, depending on different designs. In addition, whether the two touch driving lines 102 receive the same touch driving signal TX(i) and whether the other two touch driving lines 102 receive the same touch driving signal TX(i+1) The design is also not intended to limit the invention.

In this embodiment, the plurality of data lines 107 are electrically connected to the control unit 21, so that the control unit 21 of the in-cell touch display 1 transmits a plurality of data signals over a period of time in the display mode via the plurality of data lines 107. Writing a plurality of data signals to the plurality of pixel electrodes 112 for receiving a plurality of touch sensing signals generated on the data lines 107 by the plurality of touch driving signals for a period of time in the touch mode signal. In other words, in addition to being a voltage source for pixel voltage writing, the plurality of data lines 107 can also be switched to a plurality of touch sensing lines for receiving touch sensing signals.

Compared with the architecture of the conventional in-cell touch display, the in-cell touch display 1 does not require an additional touch sensing line, but only the wiring of the plurality of touch driving lines 102 in the thin film transistor process. . In summary, inline The touch display 1 can maintain the transmittance and the aperture ratio, and has only two layers of glass, so that it has the advantage of being light and thin. In addition, the in-cell touch display 1 can be disposed in an electronic device and electrically connected to the electronic device body of the electronic device.

Please refer to FIG. 2 , which is a schematic diagram of a stack structure of an in-cell touch display device according to an embodiment of the invention. As shown in FIG. 2, in this embodiment, the in-cell touch display 1 includes a thin film transistor substrate, a liquid crystal layer 113, a color filter 114, and a glass 115 arranged from bottom to top. The thin film transistor substrate includes a glass 101 arranged from bottom to top, a touch driving line 102, an insulating layer 103, a gate line 104, a gate insulating layer 105, a channel layer 106, a data line 107, a protective layer 108, and a flat layer 109. The common electrode 110, the protective layer 111 and the pixel electrode 112.

In this embodiment, since the common electrode 110 is located between the liquid crystal layer 113 and the data line 107 and the touch driving line 102, the data line 107 and the touch driving line 102 may be shielded, so that the in-cell touch is performed. The display 1 may need to be used upside down, that is, the glass 101 is used as a protective cover, and the backlight is incident on the in-cell touch display 1 from the side of the glass 115. The material of the common electrode 110, the data line 107, the gate line 104, the pixel electrode 112, and the touch driving line 102 may be a transparent conductor such as indium tin oxide, but the invention is not limited thereto. In addition, in other embodiments, the common electrode 110 may be disposed between the liquid crystal layer 113 and the color filter substrate (consisting of the color filter 114 and the glass 115), that is, formed on the color filter substrate.

In addition, it should be noted that the position of the touch driving line 102 is not intended to limit the present invention. For example, the touch drive line 102 can be moved between the flat layer 109 and the protective layer 108. In addition, the stacked structure of the in-cell touch display 1 of FIG. 2 is not intended to limit the present invention, and the field has Generally, after referring to the foregoing description, the knowledgeable person may modify the stack structure of the in-cell touch display 1, for example, remove the flat layer 109 or provide another protective layer or insulating layer or the like.

Please refer to FIG. 1 and FIG. 3. FIG. 3 is a waveform diagram of signals of an in-cell touch display according to an embodiment of the present invention. In FIG. 3, the control unit can transmit a plurality of data signals to the plurality of data lines 107 in the display mode by means of time division multiplexing, and receive a plurality of touch feelings through the plurality of data lines 107 in the touch mode. Measuring signal.

In more detail, when the gate voltage signal G(N) of the plurality of gate lines 104 is at a logic high voltage level, the control unit 21 transmits a plurality of data signals to the plurality of data lines 107 to the pixel electrodes 112. The image to be presented is displayed by driving the liquid crystal to deflect. When the gate voltage signal G(N) of the plurality of gate lines 104 is at a logic low voltage level, the control unit 21 stops transmitting a plurality of data signals to the plurality of data lines 107, and the touch driving signal TX ( i) is transmitted to the touch driving line 102, and the control unit 21 receives a plurality of touch sensing signals through the plurality of data lines 107. When an object touches the in-cell touch display, the sensing side signal changes. It is possible to determine at least one contact position.

Then, when the gate voltage signal G(N+1) is at a logic high voltage level (in the display mode), a plurality of data signals are sent to the plurality of data lines 107, and when the gate voltage signal G(N+1) When the logic is low voltage level (in the touch mode), the touch driving signal TX(i) is transmitted to the touch driving line 102, and the plurality of data lines 107 are used to receive the plurality of touch sensing signals. Please note that because any two touch driving lines 102 receive the same touch driving signal TX(i), the touch driving signal TX(i) corresponds to two gate driving voltage signals G(N). With G(N+1). However, the present invention is not limited to this.

When the voltage signal G(N+2) of the gate line 104 is a logic high voltage level ( In the display mode, the control unit 21 transmits a data signal to the data line 107. When the voltage signal G(N+2) of the gate line 104 is at a logic low voltage level (in the touch mode), the control unit 21 stops transmitting a plurality of data signals to the plurality of data lines 107, and touches the touch The driving signal TX(i+1) is transmitted to the touch driving line 102, and the control unit receives the plurality of touch sensing signals through the plurality of data lines 107 to determine at least one contact position.

Then, when the gate voltage signal G(N+3) is at a logic high voltage level (in the display mode), a plurality of data signals are sent to the plurality of data lines 107, and when the gate voltage signal G (N+3) When the logic is at a low voltage level (in the touch mode), the touch driving signal TX(i+1) is transmitted to the touch driving line 102, and the plurality of data lines 107 are used to receive the plurality of touch sensing signals. . Incidentally, the time when the gate voltage signal G(N) is at the logic low voltage level can be adjusted by the logic enable mode of the output enable (OE), thereby adjusting the touch for sensing The time at which the signal is sensed.

Please refer to FIG. 1 and FIG. 4. FIG. 4 is a waveform diagram of signals of an in-cell touch display according to another embodiment of the present invention. In FIG. 4, the control unit also transmits a plurality of data signals to the plurality of data lines 107 in a display mode by means of time division multiplexing, and receives a plurality of touch sensing signals through the plurality of data lines 107 in the touch mode. signal. However, unlike FIG. 3, the display mode is within the display time of one screen, at which time the control unit 21 transmits the gate voltage signals G(0) G(N) to the plurality of gate lines 104, and Transmitting a plurality of data signals to the data line 107; the touch mode is within a vertical blanking time of the screen, at which time the control unit 21 stops transmitting the plurality of data signals to the plurality of data lines 107, and The plurality of touch driving signals TX(i) and TX(i+1) are transmitted to the plurality of touch driving lines 102, and the control unit 21 receives the plurality of touch sensing signals through the plurality of data lines 107 to determine At least one contact position.

Please refer to FIG. 5. FIG. 5 is a plan view of a thin film transistor substrate of an in-cell touch display according to another embodiment of the present invention. The in-cell touch display 5 includes a thin film transistor substrate, a liquid crystal layer (not shown in FIG. 5 ), a color filter substrate (not shown in FIG. 5 ), and a control unit 61 , wherein the liquid crystal layer is located on the thin film transistor substrate and the color Between the filter substrates, that is, on the thin film transistor substrate. The thin film transistor substrate includes a whole layer of common electrodes (not shown in FIG. 5), a plurality of pixel electrodes 503, a plurality of gate lines 501, and a plurality of data lines 502. The common electrode, the plurality of pixel electrodes 503, the plurality of gate lines 501, and the plurality of data lines 502 may be located at different layers from each other.

It should be noted that the control unit 61 transmits the gate voltage signal in the display mode and the touch driving signal to the gate line 501 in the touch mode through the time division multiplexing mode. When the gate line 501 transmits the gate voltage signal (in the display mode), the plurality of data signals are correspondingly transmitted to the plurality of data lines 502, and when the gate line 501 transmits the touch driving signal (in the touch mode), The plurality of data lines 502 are configured to receive a plurality of touch sensing signals.

The plurality of gate lines 501 extend along the first axial direction (for example, the X axis) while being arranged in parallel with each other. A plurality of data lines 502 extend along a second axial direction (eg, the Y-axis) and are arranged in parallel with each other. The plurality of gate lines 501 and the plurality of data lines 502 intersect on a plane to define a plurality of pixel regions, and the plurality of pixel electrodes 503 are located in the plurality of pixel regions.

In this embodiment, the plurality of data lines 502 are electrically connected to the control unit 61. Therefore, the data line 502 of the in-cell touch display 5 serves as the data line of the thin film transistor corresponding to each pixel electrode and is used for sensing. The touch sensing line of the touch sensing signal is used. In other words, in addition to being able to be written as a pixel voltage, the data line 502 can also be switched to touch sensing for touch. Line to receive touch sensing signals.

In addition, the plurality of gate lines 501 are also electrically connected to the control unit 61. Therefore, the gate line 501 of the in-cell touch display screen 5 serves as a gate line of the thin film transistor corresponding to each pixel electrode and is used for transmitting. The touch drive line of the touch drive signal is used. In other words, in addition to the way of controlling the thin film transistor switch, the gate line 501 can also be switched to the touch driving line for touch to transmit the touch driving signal.

Compared with the structure of the conventional in-cell touch display, the in-cell touch display 5 does not require an additional touch sensing line and a touch driving line, and does not need to change the manufacturing process of the thin film transistor. In summary, the in-cell touch display 5 is capable of maintaining transmittance and aperture ratio, and has only two layers of glass, so that it has the advantage of being light and thin.

Please refer to FIG. 5 and FIG. 6. FIG. 6 is a waveform diagram of signals of an in-cell touch display according to another embodiment of the present invention. In FIG. 6, the data signal of the data line is a square wave signal with positive and negative switching. Taking the adjacent two gate lines G(N) and G(N+1) as an example, the control unit 61 controls the gate line G ( N) and G(N+1) transmit the on-time of the display drive signal for displaying the picture to be smaller than the time when the data signal on the data line is switched positively and negatively. Therefore, after the turn-on time of the display driving signal for displaying the picture on the gate line G(N) ends, the data signal of the data line corresponding to the gate line G(N) has not been switched to another polarity and adjacent. The gate line G(N+1) has not yet transmitted the display driving signal for displaying the picture, and the control unit 61 provides a pulse signal to the gate line G(N+1) for touch control during this time. Touch drive signals, such as TX(i). Similarly, during this time, the data line corresponding to G(N) is switched by the control unit 61 as a touch sensing line to receive the sensing caused by the touch driving signal TX(i) on G(N+1). A touch sensing signal with a change in capacitance.

In other words, in addition to the way of controlling the thin film transistor switch, the gate lines G(N) and G(N+1) can also be switched to the touch driving lines for touch to transmit the touch driving signals. In addition to being used as a pixel voltage writing method, the data line 502 can also be switched to a touch sensing line for touch to receive the touch sensing signal.

In summary, the in-cell touch display provided by the embodiment of the present invention does not need to additionally design a touch sensing line, and even does not need to additionally design a touch driving line. Therefore, the in-cell touch display can be The aperture ratio and the transmittance are maintained, and the process of the thin film transistor does not need to be changed. In addition, because the in-cell touch display can have only two layers of glass, it is in line with the advantages of light weight and shortness of electronic products.

The above description is only an embodiment of the present invention, and is not intended to limit the scope of the invention.

1‧‧‧Inline touch display

101‧‧‧ glass

102‧‧‧Touch drive line

103‧‧‧Insulation

104‧‧‧ gate line

105‧‧‧gate insulation

106‧‧‧Channel layer

107‧‧‧Information line

108‧‧‧Protective layer

109‧‧‧flat layer

110‧‧‧Common electrode

111‧‧‧Protective layer

112‧‧‧pixel electrode

113‧‧‧Liquid layer

114‧‧‧Color filter

115‧‧‧ glass

21, 61‧‧‧ control unit

5‧‧‧Inline touch display

501‧‧‧Information line

502‧‧‧ gate line

503‧‧‧pixel electrode

1 is a plan view showing a thin film transistor substrate of an in-cell touch display device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a stack structure of an in-cell touch display device according to an embodiment of the invention.

3 is a waveform diagram of signals of an in-cell touch display device according to an embodiment of the present invention.

4 is a waveform diagram of signals of an in-cell touch display according to another embodiment of the present invention.

5 is a plan view of a thin film dielectric substrate of an in-cell touch display according to another embodiment of the present invention.

6 is a waveform diagram of signals of an in-cell touch display according to another embodiment of the present invention.

1‧‧‧Inline touch display

102‧‧‧Touch drive line

104‧‧‧ gate line

107‧‧‧Information line

112‧‧‧pixel electrode

21‧‧‧Control unit

Claims (10)

An in-cell touch display comprising: a thin film transistor substrate comprising: a plurality of gate lines extending along a first axial direction and arranged in parallel with each other; and a plurality of data lines along a second axis And extending parallel to each other, the data lines are interleaved with the gate lines to define a plurality of pixel regions; and a control unit electrically coupling the gate lines and the data lines, the control unit The control unit is configured to perform a plurality of display data signals to the data lines in the display mode, wherein the control unit transmits the plurality of display data signals to the data lines. The control unit receives the plurality of touch sensing signals on the data lines. The in-cell touch display device of claim 1, wherein the thin film transistor substrate further comprises a plurality of touch driving lines, the touch driving lines extending along the first axial direction and parallel to each other arrangement. The in-cell touch display of claim 2, wherein in the display mode, a gate voltage signal of the gate lines is a logic high voltage level, and the data lines are used to transmit the Displaying the data signal; in the touch mode, the gate voltage signals of the gate lines are at a logic low voltage level, and the corresponding touch driving lines transmit a touch driving signal, and the data is The line is used to receive the touch sensing signals. The in-cell touch display of claim 2, wherein the display mode is within a display time of a screen, and the gate lines are used. Transmitting a plurality of gate voltage signals, and the display data signals are transmitted to the data lines; the touch mode is within a vertical blanking time of the screen, and the plurality of touch driving signals are The data is transmitted to the touch control lines, and the data lines receive the touch sensing signals. The in-cell touch display of claim 2, wherein the thin film transistor further comprises a plurality of pixel electrodes located in the pixel regions, wherein the pixel electrodes, the data lines, and the gates The lines and the touch drive lines are located at different layers from each other. The in-cell touch display of claim 2, wherein at least two of the touch driving lines receive the same touch driving signal. The in-cell touch display of claim 5, further comprising: a color filter substrate; a liquid crystal layer between the color filter substrate and the thin film transistor substrate; and a common electrode located at the Between the liquid crystal layer and the thin film transistor substrate. The in-cell touch display of claim 2, wherein the touch driving lines avoid the gate lines on a plane. The in-cell touch display of claim 1, wherein the control unit is further configured to operate the gate lines in a display mode and a touch mode, wherein in the display mode, The control unit transmits a plurality of display driving signals to the gate lines and transmits a plurality of display data signals to the data lines. In the touch mode, the control unit transmits a plurality of touch driving signals to the gates. Lines and receive a plurality of touch sensing signals on the data lines. An in-cell touch display device, wherein the in-cell touch display is electrically connected to the in-cell touch display device according to any one of claims 1 to 9 Electronic device body.