TW201843569A - In-cell touch display device and communicating method thereof with an active stylus thereof - Google Patents

Abstract

The present invention relates to an in-cell touch display device and a communicating method thereof with an active stylus. The in-cell touch display device has multiple common electrodes and the communicating method is executed in an image display frame by outputting an up-link signal through the multiple common electrodes to communicate with the active stylus. Therefore, the in-cell touch display device can support the touch function of the active stylus.

Description

In-cell touch display device and communication method thereof with active pen

The invention relates to a communication method between a display device and an active pen, in particular to an in-cell touch display device and a communication method thereof with the active pen.

At present, most of the active pen touch display devices are an out-cell touch display device or an on-cell touch display device, wherein a display panel of the external or top-mounted touch display device is additionally A plurality of sensing electrodes are formed. As shown in FIG. 9, the external touch display device 40 includes a display panel 41. The outer surface of the display panel 41 is provided with a touch panel 42. The display panel 41 is electrically connected to a scan driver 411 and a data driver 412 for driving the display panel 41 to display images, and the touch panel 42 is additionally electrically connected to a touch controller 421 for driving the touch panel. A plurality of sensing electrodes (not shown) on 423 sense the operation of the finger or the active pen.

With the trend toward thinner and lighter electronic products, touch display devices are gradually becoming mainstream products with touch and display driver integration (TDDI) in an in-cell touch panel (In-cell). However, the display panel using touch and display driver integration technology can realize the touch function of the finger, but the touch detection application in parallel with the finger and the active pen, especially the communication between the touch display device and the active pen The approach is still further seeking technical solutions for improvement.

In view of the above-mentioned problem of the communication mode between the in-cell touch display panel and the active pen, the main object of the present invention is to provide an in-cell touch display device capable of supporting the active pen touch function, and the in-cell touch display. The method of communication between the device and the active pen.

The main technical means for achieving the above purpose is that the communication method of the in-cell touch display device and the active pen includes: transmitting a plurality of common electrodes by the in-cell touch display device during an image display period An up signal to communicate with an active pen.

Since the in-cell touch display device does not additionally form a sensing electrode for touch, the in-cell touch display device 10 of the present invention directly transmits the common electrode C ₁ for display use and touch detection use. ~C _K to transmit the uplink signal P _UL ; thus, when the active pen 30 is close to the in-cell touch display device 10, the uplink signal P _UL can be received, and the in-cell touch display device 10 can be used to perform signals. Communicating, the in-cell touch display device 10 detects the position of the active pen 30 and completes an interaction between the two.

The main technical means for achieving the above purpose is that the in-cell touch display device comprises: a plurality of display pixels, a plurality of common electrodes, an image driving unit and a touch sensing unit; wherein: the plurality of display pixel systems The plurality of display pixels are electrically connected to the image sensing unit, and the plurality of display electrodes are electrically connected to the touch sensing unit, and the touch sensing unit is electrically connected to the image driving unit. During an image display period, the touch sensing unit transmits the uplink signal through at least a portion of the plurality of common electrodes to communicate with an active pen.

Since the in-cell touch display device does not additionally form a sensing electrode for touch, the in-cell touch display device 10 of the present invention directly transmits the common electrode C for display use and touch detection use. ₁ to C _K to transmit the uplink signal P _UL ; thus, when the active pen 30 is close to the in-cell touch display device 10, the uplink signal P _UL can be received, and the in-cell touch display device 10 is The signal communication enables the in-cell touch display device 10 to detect the position of the active pen 30 and complete the interaction between the two.

The present invention is directed to an in-cell touch display device that is modified to support an active pen touch function. The technical content of the present invention will be described in detail below in conjunction with various embodiments and drawings.

Referring to FIG. 1 , the in-cell touch display device 10 of the present invention mainly includes a display panel 11 , an image driving unit 12 , and a touch sensing unit 20 . The image driving unit 12 includes a The gate driving unit 121 and the data driving unit 122; the gate driving unit 121, the data driving unit 122 and the touch sensing unit 20 are electrically connected to the display panel 11.

As shown in FIG. 1 , 2A and 2B , the display panel 11 of the touch display device 10 mainly includes a plurality of gate lines G ₁ G G _m , a plurality of data lines D ₁ -D _n , and a plurality of pixel electrodes 112. a plurality of thin film transistors Q ₁₁ ~Q _1n , Q ₂₁ ~Q _2n ..., Q _m1 ~Q _mn , a complex signal line L ₁ ~L _K and a common electrode layer 111; wherein the plurality of gate lines G ₁ ~G _m are The plurality of data lines D ₁ -D _n are electrically connected to the data driving unit 122. In addition, the plurality of gate lines G ₁ to G _m and the plurality of data lines D ₁ to D _n are electrically insulated from each other and intersect with a plurality of pixel regions arranged in a matrix, and then the pixel electrodes 112 and the pixel electrodes 112 and Each of the thin film transistors Q ₁₁ ..., Q _mn is disposed in the corresponding pixel region, and the gate, the source and the drain of each of the thin film transistors Q ₁₁ ..., Q _mn are electrically connected to each other in sequence Corresponding to the gate lines G ₁ to G _m of the pixel regions, the data lines D ₁ to D _n and the pixel electrodes 112 to constitute one display pixel P ₁₁ ~P _1n , P ₂₁ ~P _2n ..., P _m1 ~P _Mn . Further, the common electrode layer 111 is provided in parallel with the plurality of pixel electrodes 112 electrically insulated from each other. In the embodiment, when the touch display device 10 is developed, the gate driving unit 121 sequentially drives the plurality of gate lines G ₁ G G _m to be connected to the driven gate lines G ₁ G G _m film transistor _{Q 11 ~ Q 1n, Q 21} ~ Q 2n ..., Q m1 ~ Q mn is turned on, the turned on thin film transistors _{Q 11 ~ Q 1n, Q 21} ~ Q 2n ..., Q m1 ~ Q mn , and then output via the data line D which they are attached ₁ ~ D _n the data driving unit 122 to the data lines D ₁ ~ D _n display signal V _d1 ~ V _dn which is applied to the pixel electrode 112, to determine the conduction of The gray scale or color of the pixel electrode 112 to which the thin film transistors Q ₁₁ to Q _1n , Q ₂₁ to Q _2n ..., Q _m1 to Q _mn are connected, thereby displaying an image.

In this embodiment, as shown in FIG. 3A, the common electrode layer 111 includes a plurality of common electrodes C ₁ -C _K arranged in a matrix, and the complex common electrodes C ₁ -C _K are respectively transmitted through the corresponding signal lines L _{1 .} ~L _{K is} electrically connected to the touch sensing unit 20; as shown in FIG. 2A, each of the common electrodes C ₁ -C _K corresponds to h display pixels, where h is a positive integer and greater than 1. The following description for convenience the present embodiment of the technical content, FIG. 2B to the total of the electrode as shown in Example C _1, C ₁ of the common electrode line corresponding to nine pixel electrodes P ₁₁ ~ P _33, i.e., h = 9; but, actually present The number of pixel electrodes corresponding to the common electrode of the embodiment depends on the required touch resolution. Preferably, the size of each common electrode of the embodiment corresponds to a single sensing electrode size of a general independent touch panel.

As shown in FIG. 1 , the touch sensing unit 20 includes a controller 21 and a plurality of sensing circuits 22 . The controller 21 is electrically connected to the data driving unit 122 and each of the sensing circuits 22 . The complex sensing circuit 22 is connected to the corresponding common electrodes C ₁ -C _K through the signal lines L ₁ -L _{K ,} respectively. Referring to FIG. 4A, FIG. 4B, FIG. 5A, FIG. 5B, FIG. 6A and FIG. 6B, the present invention is transmitted by the touch sensing unit 20 during a predetermined image display period of the display panel 11. The plurality of common electrodes C ₁ -C _K emit an uplink signal P _UL , that is, as shown in FIG. 3A , an active pen 30 adjacent to the in-cell touch display device 10 can further receive the uplink signal P _UL . When the transceiver unit 31 of the active pen 30 receives the uplink signal P _UL and successfully pairs, the signal P _DL is transmitted to the in-cell touch display device 10; at this time, the touch sensing unit is further used. The receiving the downlink signal P _UL through the plurality of common electrodes C ₁ -C _{K to} complete signal communication and position detection with the active pen 30. In this embodiment, the uplink signal P _UL may include information related to the active pen 30, such as identification information, synchronization information (eg, Beacon information), and encoded information.

In the first embodiment of transmitting the uplink signal P _UL , the uplink signal P _UL includes information consisting of the values “1” and “0”, but is not limited to this implementation. Therefore, the manner in which the uplink signal P _UL is transmitted through the complex common electrodes C ₁ to C _K can be used to change the voltage level change of the complex common electrodes C ₁ to C _K as the synchronization included in the uplink signal P _UL . News. For example, please refer to FIG. 7A. When the voltage level of the complex common electrodes C ₁ -C _K is high, it represents the value "1", and the voltage level of the complex common electrode C ₁ ~C _K When it is low, it means the value "0"; vice versa. Specifically, as shown in FIG. 3B, for one of the methods of changing the voltage level of the complex common electrode C ₁ -C _K , a first common electrode C ₁ and its corresponding sensing circuit 22 are taken as an example. Description of; the sensing system circuit 22 includes a multiplexer MUX, a receiver circuit 221 and a first switches S _1, the multiplexer MUX is electrically connected to a first line source voltage V _H, a second voltage V _L between the source electrode and the first common C _1, the receiving circuit 221 through the first connection line switch S ₁ is electrically to the first common electrode C _1, the multiplexer MUX and the first switch S ₁ is connected to both The controller 21 controls the operation of opening and closing by the controller 21. If the voltage level of the first common electrode C ₁ is to be controlled to transmit the uplink signal P _UL , the controller 21 causes the first switch S _{1 to be} disconnected, so that the sensing circuit 22 does not share the first The electrode C _{1 is} electrically connected. At this time, according to the data composition of the uplink signal P _UL (the value “1” and “0”), the multiplexer MUX switching is controlled via the controller 21; when the multiplexer MUX is controlled When switching to the first voltage source V _H , the first voltage source V _{H is} electrically connected to the first common electrode C ₁ , because the voltage level of the first voltage source V _H is higher than that of the second voltage source V _L The voltage level is high, so that the voltage V _{C1 of} the first common electrode C ₁ can be increased, that is, as shown in FIG. 7A , and at a high voltage level to correspond to the value “1”; When the device MUX is switched to the second voltage source V _L , the voltage V _{C1 of} the first common electrode C ₁ is lowered, and is at a low voltage level, representing a value “0”; thus, the controller 21 can be controlling each of the sensing circuit 22 of the multiplexer MUX and the first switches S _1, so that the plurality of common electrodes simultaneously C ₁ ~ C _K P _UL signal based on the uplink information and then change its composition Pressure level, providing the uplink signal smoothly P _UL of the active pen 30 for receiving. In addition, in this embodiment, all or a portion of the common electrodes C ₁ -C _K can be used to perform the transmission process of the uplink signal P _UL , for example, the common electrode of the single or even rows can be executed only by the uplink signal. P _UL 's transfer program to save power.

Referring to FIG. 3C, the second common embodiment of transmitting the uplink signal P _UL is also illustrated by taking the first common electrode C ₁ and its sensing circuit 22 ′ as an example. Wherein the sensing circuit 22 'includes a system unit 222 generates an uplink signal, a second switch S _2, a first receiving circuit 221 and a switch _{S. 1;} where the uplink line signal generating unit 222 through the second switch S ₂ is electrically connected to the first common electrode C _1, the receiving circuit 221 and the line connected to the first common electrode C ₁ through the first switch S ₁ is electrically, the first and second switch S ₁ is, S ₂ are connected The controller 21 controls the operation of opening and closing by the controller 21. If the voltage level of the first common electrode C ₁ is to be controlled to transmit the uplink signal P _UL , the controller 21 causes the first switch S _{1 to be} disconnected, so that the sensing circuit 22 does not share the first The electrode C _{1 is} electrically connected. At this time, the uplink signal generating unit 222 is controlled to generate the voltage signal V _UL including the active pen synchronization information such as identification information, synchronization information, and encoded information. At the same time, the controller 21 also controls the The second switch S _{2 is} turned on; when the second switch S _{2 is} controlled to be turned on, the voltage signal V _UL is output to the first common electrode C ₁ , that is, by the voltage level change of the voltage signal V _UL , The first common electrode C ₁ smoothly provides the corresponding uplink signal P _UL for the active pen 30 to receive.

The following advancement describes the time when the complex common electrode C ₁ -C _K transmits the uplink signal P _UL . First, please refer to FIG. 4A , which is one of the image display periods of the in-cell touch display device 10 . For example, the frequency is 60 Hz, and the image display cycle time is about 16.67 ms. The image display period of this embodiment includes an execution time segment (about 13.67 ms) and a vertical blank time segment VBI (about 3 ms); in this embodiment, the vertical blank time segment VBI is adjacent to the execution. A time segment that includes a single display time period d. In the execution time section, as shown in FIG. 1 and FIG. 2B, the gate driving unit 121 and the data driving unit 122 of the image driving unit 12 drive the respective films of the display panel 11 according to the input image information. The transistors Q ₁₁ ~Q _1n , Q ₂₁ ~Q _2n ..., Q _m1 ~Q _mn , so that the display pixels P ₁₁ ~P _1n , P ₂₁ ~P _2n ..., P _m1 ~P _{mn are} developed; In the vertical blank time section VBI, the gate driving unit 121 no longer drives the thin film transistors Q ₁₁ ~Q _1n , Q ₂₁ ~Q _2n ..., Q _m1 ~Q _mn , so each of the display pixels P ₁₁ ~ P _1n , P ₂₁ ~P _2n ..., P _m1 ~P _mn maintain the pressure difference between the corresponding common electrodes, that is, maintain the original display image; therefore, as shown in FIG. 7A, In the vertical blank time section VBI, the uplink signal P _{UL is} transmitted by the complex common electrode C ₁ ~C _K for the active pen 30 to receive without affecting each of the display pixels P ₁₁ ~P _1n , P ₂₁ ~P _2n ... , P _m1 ~ P _mn image display. As shown in FIG. 3A, after the uplink signal P _{UL is} transmitted from the complex common electrodes C ₁ -C _K , the vertical common time period CBI is received through the complex common electrode C ₁ -C _{K again.} The downlink signal P _DL sent by the active pen 30.

In addition, as shown in FIG. 4B and FIG. 8A, in another embodiment, the complex common electrodes C ₁ -C _K of the present invention may also be adjacent to the vertical blank time period VBI in the display period d. Transmitting the uplink signal P _UL so that the time of the vertical blank time zone VBI is not occupied, so that the in-cell touch display device 10 can have more time to receive the vertical blank time zone VBI. The active pen 30 has a signal P _DL or other touch application applied by an animal such as a finger. However, transmitting the uplink signal P _UL in the foregoing manner in the display period d also needs to take into account the voltage level on the common electrodes C ₁ -C _K currently used for display, and thus the display for being driven The common electrode corresponding to the pixel (taking the common electrode C _K as an example), the common electrode C _K still needs to provide the currently driven display pixels P _m(n-2) , P _m(n-1) , P _mn The reference voltage is used to maintain the normal display image. However, the voltage level of the common electrode C _K is dynamically adjusted due to the aforementioned provision of the uplink signal P _UL , and is no longer a fixed reference voltage Vcom. As shown in FIG. 1, FIG. 2A and FIG. 8B, the controller 21 notifies the data driving unit 122 to dynamically adjust the output to the driven display pixels Pm _(n-2) , Pm _(n-1) , P. The pixel electrode 112 of _{mn is} at a voltage level. For example, the data driving unit 122 can obtain, by the controller 21, the voltage level of the common electrode C _K corresponding to the display pixels P _m(n-2) , P _m(n-1) , and P _mn that are currently driven. Bit, and the original data voltage V _dn originally supplied to the display pixels P _m(n-2) , P _m(n-1) , P _mn currently corresponding to being driven is adjusted to V _dn ', and V _dn '= V _dn +(V _CK -Vcom), that is, the original data voltage V _dn plus the voltage difference between the current common electrode voltage V _CK and the reference voltage Vcom level; when the current common electrode voltage V _{CK is} the common electrode When C _{K is} connected to the voltage level of the first voltage source V _H , the voltage level of the common electrode C _K has risen from Vcom to V _CK ; thus, the display pixel P _m(n-2) that is currently driven, The voltage difference between the pixel electrode voltage of P _m(n-1) and P _mn and the common electrode C _K can still be maintained at V _P , where V _P is supplied to the driven display pixel P _{m (n-2) )} , the voltage difference between the original data voltage V _{dn of} P _m(n-1) and P _mn and the original voltage level Vcom of the common electrode C _K , and V _dn +(V _CK -Vcom))-V _CK the result is still the (V _P = V _dn -Vcom) the same V _P, it can ensure that the plurality of driven Illustrates the pixel _{P m (n-2),} P m (n-1), the display image P _mn will not be emitted to the common electrode C _K P _UL influence of the upstream signal. As for the common electrode C _K corresponding to other display pixels P _(m-2)(n-2) , P _(m-2)(n-1) , P _(m-2)(n) , P ₍ not being driven _{) M-1)(n-2)} , P _(m-1)(n-1) , P _(m-1)(n) , in which P _{(m-1)n is taken} as an example and shown in Fig. 8B, Since the thin film transistor Q _{(m-1)n of} the display pixel P _(m-1)n is no longer driven at this time, even if a new data voltage _Vdn ' at this time is supplied to the thin film transistor Q _{(m) -1)n} does not change the voltage difference V _P between the pixel electrode 112 of the display pixel P _(m-1)n and the common electrode C _K while still maintaining the image displayed after it is originally driven. Therefore, in the display time period d, the display pixel P ₁₁ ~P _{mn can} display the image and the uplink signal P _UL is transmitted through the common electrode C ₁ -C _K for the active pen 30. receive. As shown in FIG. 3A, after the uplink signal P _UL is transmitted from at least a portion of the complex common electrodes C ₁ -C _K in the display period d, then re-transmitted in the vertical blank time segment VBI. At least a portion of the complex common electrodes C ₁ -C _K receives the downlink signal P _DL transmitted by the active pen 30.

Further, again as shown in FIG. 4C, in general the active pen transmission agreements usually interspersed with a waiting time T _gap between the upstream signal and the downstream signal P _UL P _DL, the uplink signal to the P _UL transmission will be completed After the waiting time T _gap , the downlink signal P _DL sent by the active pen 30 is received. In an embodiment, the uplink signal P _UL further includes the waiting time T _gap and the next signal receiving time. Point t _DL , as shown in FIG. 3A, so that when the active pen 30 receives the uplink signal P _UL , it can be known when the touch sensing unit 20 can start receiving the downlink signal P _DL ; For example, the downlink signal receiving time point t _{DL is} the starting time point of the vertical blank time zone VBI, that is, the uplink signal P _UL transmitting time and the waiting time T _gap do not occupy the vertical blank time zone VBI. time.

Referring to FIG. 5A , the image display period of another mode preset by the in-cell touch display device 10 is exemplified by a display frequency of 60 Hz, and the image display cycle time is about 16.67 ms. The image display period of this embodiment includes an execution time segment (about 16.67 ms), and is divided into a complex display time period d and a complex horizontal blank time segment HBI, and each of the display time periods d is adjacent to the one of the time segments d The horizontal blank time zone HBI; in each of the display time periods d, as shown in FIG. 1 and FIG. 2B, the gate driving unit 121 and the data driving unit 122 of the image driving unit 12 are driven according to the input image information. Each of the thin film transistors Q ₁₁ ~Q _1n , Q ₂₁ ~Q _2n ..., Q _m1 ~Q _{mn of} the display panel 11 so that the display pixels P ₁₁ -P _1n , P ₂₁ ~P _2n ..., P _m1 ~P _mn development; and in the horizontal blank time section HBI, the gate driving unit 121 no longer drives the thin film transistors Q ₁₁ ~Q _1n , Q ₂₁ ~Q _2n ..., Q _m1 ~Q _mn , Therefore, each of the display pixels P ₁₁ -P _1n , P ₂₁ -P _2n ..., P _m1 -P _mn maintains the voltage difference between the display pixels P ₁₁ -P _1n , P ₂₁ -P _2n ..., P _m1 -P _mn , that is, maintains the original display image; therefore, as shown in FIG. 7B In the horizontal blank time section HBI, the uplink signal P _UL ' is transmitted by the complex common electrode C ₁ ~C _K for the active pen 30 to receive. However, in general, the time for transmitting a complete uplink signal P _UL ' may take 1 ms, and the length of time is greater than the time of a single horizontal blank time zone HBI. Therefore, in this embodiment, several consecutive horizontal blanks are used. The time zone HBI transmits a complete uplink signal P _UL ', that is, the uplink signal P _UL ' is transmitted by the complex common electrodes C ₁ -C _K in a plurality of consecutive horizontal blank time segments HBI. As shown in FIG. 3A, after the uplink signal P _UL ' is transmitted in time division, the downlink signal P transmitted by the active pen 30 is received through the complex common electrodes C ₁ -C _K in the remaining horizontal blank time zone HBI. _DL ' or other touch applications.

In addition, referring to FIG. 5B, in another embodiment, the complex common electrodes C ₁ -C _K of the present invention may also be adjacent to the horizontal blank time zone HBI in the consecutive plurality of display time periods d. The uplink signal P _UL ' is transmitted in a time-sharing manner, so that the time of the horizontal blank time zone HBI is not occupied, so that the in-cell touch display device 10 can have more of the horizontal blank time zone HBI to receive the The active pen 30 has a signal P _DL ' or other finger touch application. 4A, FIG. 8A and FIG. 8B, the partial uplink signal P _UL ' is transmitted in each display time period d, and the display image of the display pixel being driven at the same time is not affected. The uplink signal P _UL 'transmitting can be completed smoothly within the consecutive plurality of display time periods d.

Please refer to FIG. 6A , which is another image display period preset by the in-cell touch display device 10 . If the display frequency is 60 Hz, the image display cycle time is about 16.67 ms, which includes There is an execution time segment (about 13.67 ms) and a vertical blank time segment VBI (about 3 ms), and the vertical blank time segment VBI is adjacent to the execution time segment; wherein the execution time segment is further divided into multiple numbers The time period d and the plurality of horizontal blank time segments HBI are displayed, and each of the display time periods d is adjacent to the one of the horizontal blank time segments HBI; in this embodiment, please refer to FIG. 6A, the uplink signal P _UL 'According to the foregoing method, the plurality of common electrodes C ₁ -C _{K are} time-divisionally transmitted to the active pen 30 for receiving part of the plurality of display periods d, and further in the vertical blank time section. The VBI receives the downlink signal P _DL ' returned by the active pen 30 through the complex common electrodes C ₁ -C _K . Alternatively, as shown in FIG. 6B, the horizontal blank time segments HBI are used to receive the downlink signal P _DL ', and in the vertical blank time segment VBI, as shown in FIG. 4A, by the complex common electrode C The uplink signal P _{UL is} transmitted from ₁ to C _K , and then the downlink signal P _DL transmitted by the active pen 30 is received again during the remaining time of the vertical blank time period VBI.

In summary, the in-cell touch display device 10 of the present invention transmits the uplink signal P _UL directly through the common electrodes C ₁ to C _K used for display purposes and touch detection purposes; When the pen 30 is close to the in-cell touch display device 10, the uplink signal P _UL can be received to communicate with the in-cell touch display device 10 to enable the in-cell touch display device 10 to detect The position of the active pen 30 and the interaction between the two is completed.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the present invention. The present invention has been disclosed by the embodiments, but is not intended to limit the invention, and any one of ordinary skill in the art, In the scope of the technical solutions of the present invention, equivalent modifications may be made to the equivalents of the embodiments of the present invention without departing from the technical scope of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments are still within the scope of the technical solutions of the present invention.

10‧‧‧In-cell touch display device

11‧‧‧ display panel

111‧‧‧ Common electrode layer

112‧‧‧pixel electrode

12‧‧‧Image Drive Unit

121‧‧‧Gate drive unit

122‧‧‧Data Drive Unit

20‧‧‧Touch sensing unit

21‧‧‧ Controller

22‧‧‧Sensor circuit

221‧‧‧ receiving circuit

222‧‧‧Upstream signal generation unit

30‧‧‧Active pen

31‧‧‧ transceiver unit

40‧‧‧External touch display device

41‧‧‧One display panel

411‧‧‧ scan driver

412‧‧‧Data Drive

42‧‧‧Touch panel

421‧‧‧Touch controller

FIG. 1 is a schematic diagram of a system architecture of an in-cell touch display device according to the present invention. 2A is a schematic view showing the structure of a plurality of display pixels and a plurality of common electrodes in an in-cell touch display device according to the present invention. 2B is a circuit diagram of a common electrode and its corresponding complex thin film transistor and a sensing circuit of FIG. 2A. Figure 3A is a schematic illustration of a plurality of common electrodes and an active pen of the present invention. Fig. 3B is a circuit diagram of a sensing unit of the present invention. Figure 3C is a circuit diagram of another sensing unit of the present invention. 4A is a cycle time diagram of a communication method in accordance with a first preferred embodiment of the present invention. Figure 4B is a cycle time diagram of the communication method of the second preferred embodiment of the present invention. Figure 4C: Another cycle time diagram of the communication method of Figure 4B. Figure 5A is a cycle time diagram of a communication method in accordance with a third preferred embodiment of the present invention. Figure 5B is a cycle time diagram of the communication method of the fourth preferred embodiment of the present invention. Figure 6A is a cycle time diagram of a communication method in accordance with a fifth preferred embodiment of the present invention. Figure 6B is a cycle time diagram of the communication method of the sixth preferred embodiment of the present invention. FIG. 7A is a timing diagram corresponding to one of the signals of FIG. 4A. Figure 7B: A timing diagram corresponding to one of the signals of Figure 5A. Figure 7C: A timing diagram corresponding to one of the signals of Figure 6A. FIG. 8A is a timing diagram corresponding to one of the signals of FIG. 4B. FIG. 8B is a schematic diagram showing voltage changes of a pixel corresponding to one of FIG. 4B. Figure 9: Schematic diagram of the system architecture of an external touch display device.

Claims (21)

A method for communicating an in-line display device and an active pen, wherein the in-line display device comprises a plurality of common electrodes; wherein the communication method comprises: transmitting an uplink signal by the plurality of common electrodes during an image display period To communicate with an active pen. The communication method of claim 1, the image display period includes an execution time segment and a vertical blank time segment; wherein: in the vertical blank time segment, the uplink signal is transmitted by the complex common electrode, and After the uplink signal is transmitted, the signal sent by the active pen is received by the plurality of common electrodes. The communication method of claim 1, the image display period includes an execution time segment and a vertical blank time segment; wherein the execution time segment includes a display time segment: in the display time period, by the plural The common electrode transmits the uplink signal, and after a waiting time, the signal sent by the active pen is received by the complex common electrode in the vertical blank time section. The communication method of claim 1, the image display period includes an execution time segment; wherein the execution time segment divides the plurality of display time segments and the plurality of horizontal blank time segments, and each of the display time segments is adjacent to the And a horizontal blank time segment; wherein: the uplink signal is transmitted by the complex common electrode in a plurality of consecutive horizontal blank time segments. The communication method as claimed in claim 4, wherein the signal sent by the active pen is received by the plurality of common electrodes in the remaining horizontal blank time segments of the execution time segment. The communication method of claim 1, the image display period includes an execution time segment; wherein the execution time segment divides the plurality of display time segments and the plurality of horizontal blank time segments, and each of the display time segments is adjacent to the And a horizontal blank time segment; wherein: the uplink signal is time-divisionally transmitted by the plurality of common electrodes in consecutive consecutive display periods. The communication method according to claim 6, wherein the signal sent by the active pen is received by the complex common electrode in a time division period of the complex horizontal blank time period. The communication method according to claim 7, wherein the image display period further comprises a vertical blank time segment; wherein: the vertical common time electrode receives the signal sent by the active pen in the vertical blank time segment. The communication method of claim 1, the image display period includes an execution time segment and a vertical blank time segment; wherein the execution time segment divides the plurality of display time segments and the plurality of horizontal blank time segments, and each The display time period is adjacent to the one horizontal blank time segment; wherein: in the vertical blank time segment, the uplink signal is transmitted by the complex common electrode, and after the uplink signal is transmitted, received by the complex common electrode a signal sent by the active pen; and in the complex horizontal blank time section, the signal sent by the active pen is received by the complex common electrode in a time division manner. The communication method according to any one of claims 1 to 9, wherein the transmitting the uplink signal is performed by controlling a voltage level change on the complex common electrode as synchronization information included in the uplink signal, wherein the complex common electrode When the voltage level is high, it represents the value "1". When the voltage level of the complex common electrode is low, it represents the value "0". The communication method according to any one of claims 1 to 9, wherein the transmitting the uplink signal generates a voltage signal to the plurality of common electrodes, and the voltage signal includes synchronization information. An in-cell touch display device includes: a plurality of corresponding display pixels and a plurality of common electrodes; an image driving unit electrically connected to the display pixels; and a touch sensing unit electrically connected thereto The common electrode and the image driving unit; wherein, in an image display period, the touch sensing unit transmits the uplink signal via the plurality of common electrodes to communicate with an active pen. The in-cell touch display device of claim 12, wherein the touch sensing unit comprises: a controller electrically connected to a data driving unit of the image driving unit; a plurality of sensing circuits and electrical connections To the controller, each of the sensing circuits includes: a multiplexer electrically connected to a first voltage source, a second voltage source and the corresponding common electrode, the controller controlling the multiplexer to The common electrode is connected to the first voltage source or the second voltage source, wherein a voltage level of the first voltage source is different from a voltage level of the second voltage source; and a receiving circuit is transmitted through the first switch And electrically connected to the corresponding common electrode, the first open relationship is electrically connected to the controller, and the first switch is actuated by the controller. The in-cell touch display device of claim 13, wherein: the uplink signal comprises synchronization information composed of values "1" and "0"; the controller is based on the value of the synchronization information "1" and "" 0" controls the switching of the multiplexer to adjust the voltage level of the corresponding common electrode, so that the complex common electrode transmits the uplink signal. The in-cell touch display device of claim 14, wherein the controller adjusts a voltage level of the complex common electrode during a display period of the image display period, so that the complex common electrode transmits the uplink signal The controller provides a voltage difference value before and after the voltage level adjustment of each common electrode to the data driving unit, and the data driving unit adds the voltage voltage level to the driven display pixel after adding the voltage difference. , for image display. The in-cell touch display device of claim 12, wherein the touch sensing unit comprises: a controller electrically connected to a data driving unit of the image driving unit; a plurality of sensing circuits and electrical connections Each of the sensing circuits includes: an uplink signal generating unit electrically connected to the controller, wherein the uplink signal generating unit is electrically connected to the corresponding common electrode through a second switch, The second open relationship is electrically connected to the controller, and the controller controls the actuation of the second switch; and a receiving circuit is electrically connected to the corresponding common electrode through a first switch, the first open relationship is electrically connected to The controller controls the actuation of the first switch by the controller. The in-cell touch display device of claim 16, wherein the controller controls the first switch to be closed, and controls a voltage signal outputted by each of the uplink signal generating units to the corresponding common electrode, by the common electrode Transmitting the uplink signal; wherein the voltage signal includes synchronization information of the uplink signal. A method for communicating an in-line display device and an active pen, wherein the in-line display device comprises a plurality of common electrodes; wherein the communication method comprises: receiving from the in-line display device via a receiving unit of an active pen The plurality of common electrodes emit an uplink signal for signal communication with the embedded display device; wherein the signal communication is performed during an image display period of the embedded display device. The communication method of claim 18, the image display period includes an execution time segment and a vertical blank time segment; wherein: the vertical blank time segment is received by the transceiver unit of the active pen The upstream signal transmitted by the common electrode. The communication method of claim 18, wherein the image display period comprises an execution time segment and a vertical blank time segment; wherein the execution time segment includes a display time period: in the display time period, by the initiative The transceiver unit of the pen receives the uplink signal transmitted by the complex common electrode. The communication method of claim 20, wherein the image display period includes an execution time segment; wherein the execution time segment divides the plurality of display time segments and the plurality of horizontal blank time segments, and each of the display time segments is adjacent to the And a horizontal blank time segment; wherein: in the horizontal blank time segment, the uplink signal transmitted by the complex common electrode is received by the transceiver unit of the active pen.