TW201351221A - Image display system and touch display device - Google Patents

Abstract

An image display system includes a display panel, a touch panel and a synchronization signal generating circuit. The display panel displays images in at least one active period according to a timing signal and multiple data driving signals. The touch panel outputs multiple first driving pulse signals, and senses a position of at least one touch event on a touch array. The synchronization signal generating circuit receives the first driving pulse signals output by the touch panel and performs synchronization operations with the timing signal of the display panel, to generate multiple second driving pulse signals. The synchronized second driving pulse signals are used to drive the touch array of the touch panel so that the touch panel senses the at least one touch event in at least one blanking time of the display panel.

Description

Image display system and touch display device

The present invention relates to a touch display device, and more particularly to a touch display device that can avoid mutual interference between touch sensing and screen display operations.

The touch panel is usually integrated into a flat display device (for example, a liquid crystal display (LCD), an active matrix organic light-emitting display (AMOLED), or the like to form a touch. Display device. Touch display devices are commonly used in electronic devices, such as laptop computers, personal digital assistants (PDAs), electronic books, projectors, and mobile phones, which are capable of transmitting fingers and styluses (stylus). ), the ability to perform input, such as a pen, has gradually gained attention and popularity.

Since the touch display device has the functions of touch sensing and screen display at the same time, in order to avoid mutual interference between the touch sensing and the screen display operation, the accuracy of the touch sensing or the clarity or smoothness of the screen display is affected. There is a need for a new type of touch display device that can solve the problem of mutual interference between the touch sensing and the screen display operation of the current touch display device.

According to an embodiment of the invention, an image display system includes a display panel, a touch panel, and a synchronization signal generating circuit. Display panel root The plurality of images are displayed in at least one display interval according to a timing signal and a plurality of data driving signals. The touch panel outputs a plurality of first driving pulse signals and senses a position of at least one touch event on a sensing matrix. The synchronization signal generating circuit receives the first driving pulse signals output by the touch panel, and performs synchronous operations with the timing signals of the display panel to generate a plurality of second driving pulse signals. The second driving pulse signal is used to drive the sensing matrix of the touch panel, so that the touch panel senses the at least one touch at at least one blanking time of the display panel event.

According to another embodiment of the present invention, a touch display device includes a touch panel and a synchronization signal generating circuit. The touch panel includes a sensing matrix and a touch sensing device. The touch sensing device generates a plurality of unsynchronized first driving pulse signals, receives a plurality of synchronized driving second driving pulse signals, and senses the second driving pulse signals according to the synchronized operations on the sensing matrix At least one touch event location. The synchronization signal generating circuit generates a synchronous operation of the second driving pulse signal according to the synchronization operation of the first driving pulse signal of the unsynchronized operation and a timing signal of a display panel, so that the touch sensing device is The display panel does not display a plurality of blank intervals of the image to sense the at least one touch event.

In order to make the manufacturing, operating methods, objects and advantages of the present invention more apparent, the following detailed description of the preferred embodiments and the accompanying drawings

Example:

1 is a diagram showing various embodiments of an image display system in accordance with an embodiment of the present invention. As shown in the figure, the image display system can include a touch display device 101, which simultaneously has the functions of touch sensing and screen display. An image display system according to the present invention may be included in an electronic device 100. The electronic device 100 can include the touch display device 101 and an input unit 102. The input unit 102 is configured to receive an image signal to control the touch display device 101 to display an image. According to an embodiment of the present invention, the electronic device 100 has various embodiments, including: a mobile phone, a digital camera, a number of assistants, a mobile computer, a desktop computer, a television, an automobile display, and the like. A portable disc player, or any device that includes an image display function.

2 is a block diagram showing a touch display device according to an embodiment of the invention. The touch display device 201 can include a display panel 210, a touch panel 220, and a synchronization signal generating circuit 230. The display panel 210 may include a gate driving circuit 211, a data driving circuit 212, a pixel matrix 213, and a control wafer 214. The gate driving circuit 211 is configured to generate a plurality of gate driving signals to drive the complex pixels of the pixel matrix 213. The data driving circuit 212 is configured to generate a complex data driving signal to provide a plurality of pixels of data to the pixel matrix 213. The control chip 214 is configured to generate a complex timing signal, including a complex clock signal, an Output Enable (OE) signal, a reset signal, and a Start Pulse (SP). It should be noted that in the embodiment of the present invention, the control wafer 214, the gate driving circuit 211 and the data driving circuit 212 may be independent wafers, respectively, or the control wafer 214 may be integrated into the gate driving circuit 211 and the data driving. Any of the circuits 212, and the invention is not limited to any one embodiment.

The touch panel 220 includes a sensing matrix 221 and a touch sensing device 222 . The touch sensing device 222 is configured to sense a location where a touch event on the sensing matrix 221 occurs. The touch event may occur when the user performs an input function using a medium such as a finger, a stylus, a stylus, or the like, or when the display panel is touched.

According to an embodiment of the present invention, the display panel 210 and the touch panel 220 can be fabricated as two independent panels, and are attached together by a lamination program, which is an out cell type. Touch display device. For example, the display panel 210 and the touch panel 220 can be attached together through optical glue. According to another embodiment of the present invention, the sensing matrix 221 of the touch panel 220 can be directly integrated into the pixel matrix of the display panel 220 during production, which is an in-cell type touch display. Device. For example, the touch sensing electrodes of the touch panel can be directly fabricated in a display cell of the display panel. According to still another embodiment of the present invention, the sensing matrix 221 of the touch panel 220 can be directly integrated into the surface layer of the pixel matrix of the display panel 220 during production, which is a touch on the surface type (on cell type). Display device. For example, the touch sensing electrodes of the touch panel can be directly fabricated on the surface of the display cell of the display panel. It should be noted that the novel touch display device 201 proposed by the present invention that can avoid mutual interference between the touch sensing and the screen display can be out cell type and embedded according to the above description. Any type such as an in-cell type or an on-cell type is produced, and thus the present invention is not limited to any one of the embodiments.

The 3a and 3b are example waveform diagrams showing the interference between the data driving signal of the display panel and the sensing signal of the touch panel, wherein the 3a image shows the waveform of the data driving signal of the display panel, and the 3b is a display The waveform of the sensing signal of the touch panel. Since the sensing electrodes of the touch panel are usually very close to the display unit of the display panel, there may be a capacitance between the touch panel and the display panel. As shown in FIG. 3a, when the data driving signal Data_(n) transmitted on one of the data lines of the display panel has a pulse, the pulse may be coupled to the touch panel through the capacitance between the touch panel and the display panel. One of the receivers has a similar sensing line, which causes the sensing signal Rx_(n) on the sensing line to generate a needle-like noise. Since the touch panel determines whether a touch event occurs by the voltage of the sensing signal received by the receiver, the interference generated by the data driving signal may seriously affect the accuracy of the touch sensing.

In order to solve the problem, the touch display device 201 of the present invention generates a plurality of synchronized pulse signals through the synchronization signal generating circuit 230, so that the touch panel 220 can detect the touch in the blank area of the display panel 210 without displaying the image. event. The touch display device 201 proposed by the present invention will be described in more detail below.

Figure 4 is a diagram showing an exemplary waveform of a complex timing signal of a display panel in accordance with an embodiment of the present invention. The timing signals shown in FIG. 4 include a clock signal CPV, a start pulse SP, an output enable signal OE, and a plurality of gate drive signals OUT_(n), OUT_(n+1) output by the gate drive circuit. , OUT_(n+2), OUT_(n+3), OUT_(m), OUT_(m+1), etc. As shown, the clock signal CPV is one of the basic clock signals of the system operation, which can be the horizontal clock signal of the display panel or vertical Pulse signal. The start pulse SP is used to indicate the start of a frame picture, and may also be referred to as a horizontal start pulse (STH). The output enable signal OE is used to indicate an active period and a blanking period of the display panel. In the embodiment of the present invention, the blanking period may be a horizontal blank interval of the display panel or Vertical blank interval, or horizontal blank interval and vertical blank interval of the display panel.

As can be seen from the figure, the interval in which the output enable signal OE is pulled up represents the blank interval of the display panel. At this time, the gate drive signal is pulled low, so the display panel does not display data in this interval. Conversely, the interval in which the output enable signal OE is pulled down represents the display interval of the display panel, and the display panel can display data according to the pulse of the gate drive signal and the data drive signal in this section. It is to be noted that although the signal in the above embodiment is an active high signal, the present invention is not limited thereto. The timing signal of the present invention may also be an active low signal.

According to an embodiment of the present invention, the synchronization signal generating circuit 230 can receive a plurality of unsynchronized driving pulse signals from the touch sensing device 222 of the touch panel, and receive a timing signal from the control chip 214 of the display panel 210. Please refer to FIG. 4, and the timing signal is a clock signal CPV, a start pulse SP or an output enable signal OE, etc. of the display panel, and the complex signal is synchronized according to the unsynchronized pulse signal and the timing signal. The drive pulse signal of the operation. The touch sensing device 222 further receives the synchronized pulse signal from the synchronization signal generating circuit 230, and senses the position of the touch event according to the synchronized pulse signal, so that the touch sensing device 222 can be on the display panel 210. The blank interval senses a touch event, that is, the display panel 210 does not display a blank interval of the image. The touch event is sensed to avoid mutual interference between the touch sensing and the screen display operation, affecting the accuracy of the touch sensing or the clarity or fluency of the screen display.

Figure 5 is a block diagram showing a synchronizing signal generating circuit according to an embodiment of the present invention. The synchronization signal generating circuit 530 can include at least one logic operation module 531, a processor 532, and a storage device 533. The logic operation module 531 includes at least one logic operation unit 534 for detecting an unsynchronized pulse signal (represented by the signal Tx) and at least one timing signal (for example, a clock signal CPV, a start pulse SP, or an output enable signal OE). At least one of the operations) performs at least one logic operation to generate a synchronized pulse signal (represented by signal Sync_Tx). According to an embodiment of the present invention, the logic operation performed by the logic operation module 531 can be any logical operation or multiple logical operations (for example, logical AND, logical OR, logical NOT). Any combination of logical non- (NAND), logical non-or (NOR), logical exclusive OR (XOR), logically exclusive or non-exclusive (XNOR), etc.

Figure 6 shows an embodiment of a logical operation. In this embodiment, the logic operation unit 534 can perform a logical AND operation according to the output enable signal OE and the unsynchronized pulse signal (represented by the signal Tx) to obtain the synchronized pulse signal (represented by the signal Sync_Tx). It is worth noting that the logical AND is not necessarily implemented by logic gates or gates, but may be implemented by a plurality of different logic gates equivalent to logical AND operations.

Figure 7 shows another logical operation embodiment. In this embodiment, the logic operation unit 534 can perform a logical AND operation according to the clock signal CPV and the unsynchronized pulse signal (represented by the signal Tx) to obtain the synchronized Pulse signal (represented by signal Sync_Tx). It should be noted that, in this embodiment, the processor 532 can further adjust the synchronized pulse signal Sync_Tx according to the information about the blank interval of the display panel 210, so that the synchronized pulse signal Sync_Tx finally output by the synchronization signal generating circuit is only The blank section of the display panel 210 has pulses, thereby staggering the operation of touch sensing and screen display to avoid mutual interference. The information about the blank interval can be stored in the storage device 533. For example, the signal timing of the control chip of the display panel is written into the storage device 533 in advance. The information of the signal timing may include, for example, but not limited to, the display panel 210 may begin to enter a display interval or a blank interval at a certain number of clock pulses. Due to the different product requirements, the timing signals that the display panel can provide to peripheral devices may be limited. Therefore, when the timing signal outputted by the display panel does not include the output enable signal OE, the synchronized pulse signal Sync_Tx can be further adjusted by the processor 532 according to the relevant information of the blank area of the display panel to achieve the same synchronization result. The same concept can also be applied to embodiments in which the unsynchronized pulse signal and other timing signals perform logical operations to generate synchronized pulse signals, and therefore will not be described below.

In addition, it is worth noting that when the unsynchronized pulse signal generated by the touch panel (indicated by the signal Tx) is not synchronized with the phase of the timing signal generated by the display panel, the processor 532 of the synchronization signal generating circuit can also be passed. Adjusting the phase difference (eg, providing an appropriate time delay) allows the unsynchronized pulse signal (represented by signal Tx) generated by the touch panel to be synchronized with the phase signal generated by the display panel (eg, rising edge) Align with the falling edge).

FIG. 8 is a schematic diagram showing touch sensing of a touch panel according to an embodiment of the invention. As shown in the figure, the transmitter of the touch sensing device sequentially transmits the synchronized pulse signals Sync_Tx(1)~Sync_Tx(8) received from the synchronization signal generating circuit to the sensing at times T1~T8. Matrix 221. It should be noted that the signal waveforms of the synchronized pulse signals Sync_Tx(1)~Sync_Tx(8) shown in the figure are only indicated by one pulse, however, each pulse may actually contain one or more square waves, and The invention is not limited to any one embodiment. Whenever the pulse of the pulse signal arrives, the receiver of the touch sensing device reads the signals Rx_(1)~Rx_8) on each sensing line to sense the voltage on each sensing line to determine Whether a touch event occurs and the position of the touch point is judged. According to the embodiment of the present invention, since the touch panel senses a touch event according to the blank interval of the image displayed on the display panel according to the synchronized pulse signals Sync_Tx(1)~Sync_Tx(8), the touch sensing can be avoided. The operation of the screen display interferes with each other, so that the accuracy of the touch sensing or the sharpness or fluency of the screen display is not affected by the interference.

The present invention has been described above with reference to the preferred embodiments thereof, and is not intended to limit the scope of the present invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧Electronic devices

101, 201‧‧‧ touch display device

102‧‧‧Input unit

210‧‧‧Display panel

211‧‧‧ gate drive circuit

212‧‧‧Data Drive Circuit

213‧‧‧ pixel matrix

214‧‧‧Control wafer

220‧‧‧ touch panel

221‧‧‧Sensor matrix

222‧‧‧Touch sensing device

230, 530‧‧‧ Sync signal generation circuit

531‧‧‧Logical computing module

532‧‧‧ processor

533‧‧‧Storage device

534‧‧‧Logical unit

CPV, Data_(n), OE, OUT_(n), OUT_(n+1), OUT_(n+2), OUT_(n+3), OUT_(m), OUT_(m+1), Rx_(1 ), Rx_(2), Rx_(3), Rx_(4), Rx_(5), Rx_(6), Rx_(7), Rx_(8), Rx_(n), SP, Sync_Tx, Sync_Tx_(1) , Sync_Tx_(2), Sync_Tx_(3), Sync_Tx_(4), Sync_Tx_(5), Sync_Tx_(6), Sync_Tx_(7), Sync_Tx_(8), Tx‧‧ signals

T1, T2, T3, T4, T5, T6, T7, T8‧‧‧ time

1 is a diagram showing various embodiments of an image display system in accordance with an embodiment of the present invention.

2 is a block diagram showing a touch display device according to an embodiment of the invention.

Figures 3a and 3b show exemplary waveform diagrams of the data driving signals of the display panel and the sensing signals of the touch panel interfering with each other.

Figure 4 is a diagram showing an exemplary waveform of a complex timing signal of a display panel in accordance with an embodiment of the present invention.

Figure 5 is a block diagram showing a synchronizing signal generating circuit according to an embodiment of the present invention.

Figure 6 shows an embodiment of a logical operation.

Figure 7 shows another logical operation embodiment.

FIG. 8 is a schematic diagram showing touch sensing of a touch panel according to an embodiment of the invention.

201‧‧‧Touch display device

210‧‧‧Display panel

211‧‧‧ gate drive circuit

212‧‧‧Data Drive Circuit

213‧‧‧ pixel matrix

214‧‧‧Control wafer

220‧‧‧ touch panel

221‧‧‧Sensor matrix

222‧‧‧Touch sensing device

230‧‧‧Synchronous signal generation circuit

Claims (18)

An image display system includes: a display panel for displaying a plurality of images in at least one display interval according to a timing signal and a plurality of data driving signals; a touch panel outputting a plurality of first driving pulse signals and sensing a sense Detecting a position of at least one touch event on the matrix; and a synchronization signal generating circuit receiving the first driving pulse signals output by the touch panel and synchronizing with the timing signal of the display panel to generate a complex number a second driving pulse signal, wherein the second driving pulse signal after the synchronization operation is used to drive the sensing matrix of the touch panel, so that the touch panel is at least one blank interval of the display panel (blanking time) Detecting the at least one touch event. The image display system of claim 1, wherein the display panel comprises: a pixel matrix comprising a plurality of pixels; and a gate driving circuit for generating a plurality of gate driving signals to drive the pixels. a data driving circuit for generating the data driving signals to provide data to the pixels; and a control chip for generating the timing signals. The image display system of claim 1, wherein the touch panel comprises: the sensing matrix; a touch sensing device for generating the first driving pulse signals that are not synchronized, receiving the second driving pulse signals that have been synchronized, and sensing according to the second driving pulse signals that have been synchronized The location of the at least one touch event on the sensing matrix. The image display system of claim 1, wherein the timing signal is selected from the group consisting of one of an output enable signal, a clock signal and a start pulse of one of the display panels. The image display system of claim 1, wherein the synchronization signal generating circuit comprises: at least one logic operation unit, configured to perform at least one logic according to the first driving pulse signal that is not synchronously operated and the timing signal Computing to generate the second pulse signals that have been synchronized. The image display system of claim 5, wherein the at least one logical operation is equivalent to an AND operation. The image display system of claim 5, wherein the synchronization signal generating circuit further comprises: a processor for adjusting the synchronized pulse signals according to the information about the blank intervals of the display panel. A touch display device includes: a touch panel comprising: a sensing matrix; and a touch sensing device for generating a plurality of unsynchronized first driving pulse signals and receiving a plurality of synchronized operations Driving a pulse signal, and sensing a position of the at least one touch event on the sensing matrix according to the synchronized driving second driving pulse signals; a synchronizing signal generating circuit for synchronizing the first driving pulse signal of the unsynchronized operation with a timing signal of a display panel to generate the second driving pulse signal of the synchronized operation, so that the touch feeling The measuring device senses the at least one touch event in a plurality of blank intervals in which the display panel does not display an image. The touch display device of claim 8, further comprising the display panel, wherein the touch panel is attached to the display panel. The touch display device of claim 8, further comprising the display panel, wherein the sensing matrix is integrated into a pixel matrix of the display panel. The touch display device of claim 8, further comprising the display panel, wherein the sensing matrix is integrated on a surface layer of a pixel matrix of the display panel. The touch display device of claim 8, wherein the at least one timing signal is selected from the group consisting of one of an output enable signal, a clock signal, and a start pulse of the display panel. For indicating the plural display interval of the display panel and the blank intervals. The touch display device of claim 12, wherein the output enable signal is used to indicate a plurality of display intervals of the display panel and the blank intervals. The touch display device of claim 8, wherein the blank interval is a plurality of vertical blank intervals or a plurality of horizontal blank intervals of the display panel. The touch display device of claim 8, wherein the blank space is a plurality of vertical blank areas and a plurality of horizontal blank areas of the display panel. The touch display device of claim 8, wherein the synchronization signal generating circuit comprises: at least one logic operation unit, configured to execute the first driving pulse signal and the at least one timing signal according to the unsynchronized operation At least one logic operation to generate the second drive pulse signals of the synchronized operations. The touch display device of claim 16, wherein the at least one logical operation is equivalent to an AND operation. The touch display device of claim 16, wherein the synchronization signal generating circuit further comprises: a processor, configured to adjust the synchronized operations according to the information about the blank intervals of the display panel Two drive pulse signals.