CN106997255B - Touch sensing system with active stylus and touch driving device - Google Patents
Touch sensing system with active stylus and touch driving device Download PDFInfo
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- CN106997255B CN106997255B CN201611226916.4A CN201611226916A CN106997255B CN 106997255 B CN106997255 B CN 106997255B CN 201611226916 A CN201611226916 A CN 201611226916A CN 106997255 B CN106997255 B CN 106997255B
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- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0441—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using active external devices, e.g. active pens, for receiving changes in electrical potential transmitted by the digitiser, e.g. tablet driving signals
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
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- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
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Abstract
A touch sensing system having an active stylus and a touch driving apparatus are disclosed. The touch sensing system includes: an active stylus pen for generating a first pen driving signal and a second pen driving signal synchronized with a touch driving signal input from a touch screen, the first pen driving signal being used to detect a touch input, and the second pen driving signal being used to detect an additional input related to an additional function of the active stylus pen in a touch driving period, and outputting the first pen driving signal and the second pen driving signal to the touch screen; and a touch driving device for providing the touch driving signal to the touch screen, sensing the first pen driving signal in a first period of the touch driving period, and sensing the second pen driving signal in a second period of the touch driving period.
Description
Technical Field
The present invention relates to a touch sensing system capable of performing touch input using an active stylus.
Background
A User Interface (UI) is configured to enable a user to communicate with various electronic devices, thereby enabling the electronic devices to be easily and conveniently controlled as needed. Examples of the user interface include a keypad, a keyboard, a mouse, an on-screen display (OSD), and a remote controller having an infrared communication function or a Radio Frequency (RF) communication function. The continuously developed user interface technology improves the sensitivity and operational convenience of users. Recently, user interfaces have been developed to include a touch UI, a voice recognition UI, a 3D UI, and the like.
The touch UI is necessarily suitable for the portable information device. The touch UI is implemented by forming a touch screen on a screen of a display device. The touch screen may be implemented as a capacitive touch screen. When a user contacts (or approaches) the touch sensor with his finger or a conductive material, the touch screen having the capacitive touch sensor senses a capacitance change (i.e., a charge change in the touch sensor) according to an input touch driving signal, thereby detecting a touch input.
In recent years, a stylus pen has been used as a Human Interface Device (HID) in a smart phone, a smart book, and the like. The stylus can advantageously perform finer input than a finger. The stylus includes passive and active styluses. A passive stylus has difficulty detecting a touch position of a touch screen in contact with the passive stylus because a capacitance change at the touch position is very small. The active stylus is easier to detect a touch position of the touch screen in contact with the active stylus than the passive stylus because the active stylus generates and outputs a pen driving signal to the touch position. Therefore, the development of active stylus is receiving attention.
In the related art touch sensing system, an active stylus transmits additional information (e.g., pen pressure information) of the active stylus to a touch Integrated Circuit (IC) separately from a pen driving signal, thereby implementing various convenient functions. For this, the related art active stylus separately transmits a pen driving signal and additional pen information to the touch IC by a modulation method using a high frequency (e.g., several MHz to several tens MHz) sine wave. The touch IC processes the pen driving signal and the additional pen information using a band pass filter, a detection circuit, and the like, respectively. The frequency of the pen driving signal and the additional pen information is much higher than the frequency of the touch driving signal driving the touch screen.
Since the related art touch sensing system must add a complicated processing circuit to separate the pen driving signal and the additional pen information and provide them to the touch IC, the size and manufacturing cost of the touch IC increase.
In addition, the related art touch sensing system can be applied only to an add-on (add-on) touch screen, and cannot be applied to an integrated (in-cell) touch screen. The touch screen formation method used by the add-on touch screen is to attach the touch screen on the display panel, and the touch screen formation method used by the integrated touch screen is to embed the touch sensors of the touch screen in the pixel array of the display panel.
Since the touch sensor of the integrated touch screen is coupled with the pixel signal line by the parasitic capacitance, the RC delay in the integrated touch screen is greater than that in the add-on touch screen. Therefore, in the related art touch sensing system, it is difficult for the integrated touch screen to accurately transmit the high-frequency pen driving signal and the additional pen information to the touch IC due to the lack of the RC time.
Disclosure of Invention
The present invention provides a touch sensing system capable of accurately receiving and processing additional pen information input from an active stylus in a touch sensing system having an integrated touch screen (a touch sensor embedded in a pixel array of a display panel), and an active stylus.
In one aspect, there is provided a touch sensing system in which one frame is time-divided into at least one touch driving period and one display driving period, the touch sensing system including: an active stylus pen for generating a first pen driving signal and a second pen driving signal synchronized with a touch driving signal input from a touch screen, and outputting the first pen driving signal and the second pen driving signal to the touch screen, wherein the first pen driving signal is used for detecting a touch input, and the second pen driving signal is used for detecting an additional input related to an additional function of the active stylus pen in the touch driving period; and a touch driving device for providing the touch driving signal to the touch screen, sensing a first pen driving signal input through the touch screen in a first period of the touch driving period, and sensing a second pen driving signal input through the touch screen in a second period of the touch driving period.
In another aspect, there is provided a touch driving apparatus in which one frame is time-divided into at least one touch driving period and one display driving period and the touch driving apparatus operates in the at least one touch driving period, wherein the touch driving device is used for generating a touch driving signal in the touch driving time period and providing the touch driving signal to the touch screen, sensing a first pen driving signal supplied from a stylus pen to the touch screen in a first period of the touch driving period, and sensing a second pen driving signal supplied from the stylus pen to the touch screen in a second period of the touch driving period, wherein the first pen driving signal and the second pen driving signal are synchronized with the touch driving signal, the first pen driving signal is used for detecting touch input, and the second pen driving signal is used for detecting additional input related to additional functions of the stylus pen.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification; the drawings illustrate various embodiments of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 schematically illustrates a touch sensing system of one embodiment of the invention;
FIG. 2 shows a display device applied to a touch sensing system according to an embodiment of the invention;
FIG. 3 shows an example of a touch screen implemented by integrated mutual capacitance sensors included in the display device shown in FIG. 2;
FIG. 4 illustrates an example of a touch screen implemented by an integrated self-capacitance sensor included in the display device shown in FIG. 2;
FIG. 5 shows an internal structure of an active stylus according to an embodiment of the present invention;
FIG. 6 illustrates sequentially outputting a first pen driving signal and a second pen driving signal to an active stylus according to an embodiment of the present invention in synchronization with a touch driving signal during a touch driving period;
FIG. 7 illustrates generating a second pen driving signal synchronized with a touch driving signal in an active stylus according to an embodiment of the present invention in an amplitude modulation method;
FIG. 8 illustrates generating a second pen driving signal synchronized with a touch driving signal in an active stylus according to an embodiment of the present invention by a frequency modulation method;
fig. 9 shows a touch driving apparatus included in the display apparatus shown in fig. 2;
fig. 10 shows a structure of the touch driving apparatus for digitally processing a sensing value of the second pen driving signal shown in fig. 9;
fig. 11 and 12 are waveform diagrams showing operation timings of the touch driving apparatus shown in fig. 9;
FIGS. 13 and 14 show second pen drive signals generated in three states synchronized with touch drive signals in an active stylus according to an embodiment of the invention; and
fig. 15 shows the amount of information that can be transmitted when the second pen driving signal is generated in three states.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. It should be noted that if it is determined that detailed descriptions of known techniques may mislead the embodiments of the present invention, the detailed descriptions will be omitted.
FIG. 1 schematically shows a touch sensing system of one embodiment of the invention.
Referring to fig. 1, a touch sensing system according to an embodiment of the present invention includes a display device 10 and an active stylus 20.
The display device 10 performs a display function and a touch detection function. The display device 10 is capable of detecting touch input by a conductive object, such as a finger or an active stylus 20, and has an integrated capacitive touch screen embedded therein. In embodiments disclosed herein, the touch screen may be implemented as an integrated touch screen in which touch sensors are embedded in a pixel array of a display panel. The specific structure and operation of the display device 10 will be described below with reference to fig. 2 to 4 and fig. 9 to 12.
The active stylus pen 20 operates in an Rx mode and a Tx mode based on the touch sync signal. The active stylus 20 generates a first pen driving signal synchronized with a touch driving signal received from the touch screen for detecting a touch input, and generates a second pen driving signal for detecting an additional input related to an additional function of the active stylus 20, and sequentially outputs the first pen driving signal and the second pen driving signal at a touch position between the touch screen and the active stylus 20, thereby easily detecting a touch position on the touch screen. In particular, since the active stylus pen 20 processes the second pen driving signal at the same frequency as the touch driving signal and then outputs the processed second pen driving signal at a time interval from the first pen driving signal, there is an advantage in that more accurate information can be transmitted. The structure and operation of active stylus 20 will be described in detail below with reference to fig. 5-8.
Fig. 2 shows a display device applied to a touch sensing system according to an embodiment of the present invention. Fig. 3 and 4 show a touch screen implemented by integrated mutual capacitance sensors and integrated self-capacitance sensors included in the display device shown in fig. 2.
Referring to fig. 2 to 4, the display device 10 according to the embodiment of the present invention may be implemented on the basis of a flat panel display such as a Liquid Crystal Display (LCD), a Field Emission Display (FED), a Plasma Display Panel (PDP), an Organic Light Emitting Diode (OLED) display, or an electrophoretic display (EPD). In the following description, embodiments of the present invention will be described with a liquid crystal display as an example of a flat panel display. However, the embodiments of the present invention are not limited thereto, and other flat panel displays may be used.
The display device 10 includes a display module and a touch module.
The touch module includes a touch screen TSP and a touch driver 18.
The touch screen TSP may be implemented to capacitively sense a touch input through a plurality of capacitive sensors. The touch screen TSP includes a plurality of touch sensors each having a capacitance. The capacitance can be divided into self capacitance and mutual capacitance. A single layer of conductive lines formed in one direction may form a self capacitance, and a mutual capacitance may be formed between two conductive lines crossing each other.
As shown in fig. 3, the touch screen TSP implemented by the mutual capacitance sensors Cm includes Tx electrode lines (or Tx channels), Rx electrode lines (or Rx channels) crossing the Tx electrode lines, and touch sensors Cm respectively formed at crossings of the Tx electrode lines and the Rx electrode lines. The Tx electrode lines are driving signal lines that supply charges to the touch sensors Cm by supplying a touch driving signal to each of the touch sensors Cm. The Rx electrode lines are sensor lines connected to the touch sensors Cm and supplying charges of the touch sensors Cm to the touch driving device 18. In the mutual capacitance sensing method, the touch sensors Cm are supplied with charges by supplying a touch driving signal to the Tx electrodes via the Tx electrode lines, and capacitance changes of the touch sensors Cm are sensed by the Rx electrodes and the Rx electrode lines in synchronization with the touch driving signal, so that a touch input can be recognized.
As shown in fig. 4, in the touch screen TSP implemented by the self-capacitance sensors Cs, the electrodes 31 may be respectively connected to sensor lines 32 formed in one direction. The self-capacitance sensor Cs forms a capacitance in each electrode 31. In the self capacitance sensing method, when a touch driving signal is supplied to the electrode 31 through the sensor line 32, the charge Q is accumulated on the touch sensor Cs. In this case, when a finger or a conductive object touches the electrode 31, the parasitic capacitance Cf is additionally connected to the self-capacitance sensor Cs, causing a change in the total capacitance value. Since the capacitance of the sensor touched by the finger or the conductive object is different from the capacitance of the sensor not touched by the finger or the conductive object, it is possible to determine whether or not a touch input is made.
The touch sensors Cm or Cs of the touch screen TSP may be embedded in a pixel array of the display panel DIS. The common electrode of the pixel may be divided into a plurality of segments (segments) to embed the touch sensor Cm or Cs in the pixel array. In this case, the touch sensor Cm or Cs may be implemented as a separate common electrode. Each common electrode segment may be commonly connected to a plurality of pixels and may form one touch sensor. During the display driving period, a common voltage is supplied to the common electrode of the pixel. During the touch driving period, a touch driving signal and a pen driving signal are supplied to the common electrode of the pixel.
The touch driving device 18 senses a change in charge in the touch sensor, determines whether a conductive material such as a finger (or a stylus pen) touches the touch screen TSP, detects a touch position when a touch input is performed, and calculates coordinate values XY of the touch input. In addition, the touch driving device 18 senses a change in charge of the touch sensor and generates information PAF related to an additional function of the active stylus 20. The additional information PAF of the active stylus 20 includes pen pressure information, information related to whether a key function is used (e.g., a clear function, a scroll (barrel) function, etc.), and ID information.
The display module may include a display panel DIS, display driving circuits (12, 14, and 16), and a host system 19.
The display panel DIS includes a liquid crystal layer between an upper substrate and a lower substrate. The pixel array of the display panel DIS includes pixels formed in a pixel area defined by data lines D1 to Dm and gate lines G1 to Gn, where m and n are positive integers. Each pixel may include a Thin Film Transistor (TFT) formed at an intersection of the data lines D1 through Dm and the gate lines G1 through Gn, a pixel electrode charged with a data voltage, and a storage capacitor connected to the pixel electrode and maintaining a voltage of the liquid crystal cell, etc.
Components such as a black matrix and a color filter may be formed on the upper substrate of the display panel DIS. The lower substrate of the display panel DIS may be configured in a COT (color filter on TFT) structure. In this case, a black matrix and a color filter may be formed on the lower substrate of the display panel DIS. A common electrode to which a common voltage is supplied may be formed on an upper substrate or a lower substrate of the display panel DIS. Polarizing plates are attached to the upper substrate and the lower substrate of the display panel DIS, respectively. Alignment films for setting a pretilt angle of liquid crystal are formed on inner surfaces of the upper substrate and the lower substrate of the display panel DIS, which are in contact with the liquid crystal, respectively. A column spacer is formed between the upper and lower substrates of the display panel DIS to maintain a cell gap of the liquid crystal cell constant.
A backlight unit may be disposed under a rear surface of the display panel DIS. The backlight unit may be implemented as one of an edge type backlight unit and a direct type backlight unit and may irradiate light to the display panel DIS. The display panel DIS may be implemented in any known mode including a Twisted Nematic (TN) mode, a Vertical Alignment (VA) mode, an in-plane switching (IPS) mode, a Fringe Field Switching (FFS) mode, etc.
The display driving circuit includes a data driving circuit 12, a gate driving circuit 14, and a timing controller 16. The display driving circuit writes video data of an input image to the pixels of the display panel DIS. The data driving circuit 12 converts digital video data RGB received from the timing controller 16 into positive/negative analog gamma compensation voltages and outputs the data voltages. The data driving circuit 12 then supplies the data voltages to the data lines D1 to Dm. The gate driving circuit 14 sequentially supplies gate pulses (or scan pulses) synchronized with the data voltages to the gate lines G1 to Gn, and selects pixel lines of the display panel DIS to which the data voltages are supplied.
The timing controller 16 synchronizes the operation timing of the data driving circuit 12 with the operation timing of the gate driving circuit 14 based on timing signals, such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable signal DE, and a main clock signal MCLK, which are input from the host system 19. The timing controller 16 generates a data timing control signal and a scan timing control signal for controlling the operation timing of the data driving circuit 12 and the operation timing of the gate driving circuit 14, respectively, using the timing signals. The data timing control signal includes a source sampling clock signal SSC, a source output enable signal SOE, a polarity control signal POL, and the like. The scan timing control signal includes a gate start pulse GSP, a gate shift clock signal GSC, a gate output enable signal GOE, and the like.
The host system 19 may transmit the digital video data RGB and the timing signals Vsync, Hsync, DE, and MCLK to the timing controller 16 and execute an application program related to the touch coordinate information XY and the pen attachment function input from the touch driving device 18.
In the display apparatus 10 according to the embodiment of the present invention, one frame is time-divided into at least one touch driving period TP (see fig. 6) and one display driving period DP (see fig. 6). The touch driving period TP is a period in which the touch sync signal Tsync (see fig. 6) is maintained at the first voltage level, and the display driving period DP is a period in which the touch sync signal Tsync (see fig. 6) is maintained at the second voltage level. The touch sync signal Tsync may be generated in the timing controller 16 or the host system 19.
During the display driving period DP, the data driving circuit 12 supplies the data voltages to the data lines D1 to Dm under the control of the timing controller 16, and the gate driving circuit 14 sequentially supplies the gate pulses synchronized with the data voltages to the gate lines G1 to Gn under the control of the timing controller 16. During the display driving period DP, the touch driving device 18 stops operating.
During the touch driving period TP, the touch driving device 18 supplies a touch driving signal to the touch sensors of the touch screen TSP. During the touch driving period TP, the display driving circuits (12, 14, and 16) may supply the same AC signal as the magnitude and phase of the touch driving signal to the signal lines D1 to Dm and G1 to Gn, thereby minimizing parasitic capacitances between the touch sensors and the signal lines D1 to Dm and G1 to Gn connected to the pixels. In this case, display noise mixed in the touch sensing signal can be significantly reduced, thereby improving the accuracy of touch sensing.
FIG. 5 shows an internal structure of an active stylus according to an embodiment of the present invention. Fig. 6 illustrates sequentially outputting a first pen driving signal and a second pen driving signal to an active stylus according to an embodiment of the present invention in synchronization with a touch driving signal during a touch driving period. Fig. 7 illustrates generation of a second pen driving signal synchronized with a touch driving signal in an active stylus according to an embodiment of the present invention by an amplitude modulation method. Fig. 8 illustrates the generation of a second pen driving signal synchronized with a touch driving signal in an active stylus according to an embodiment of the present invention by a frequency modulation method.
Referring to fig. 5 to 8, the active stylus pen 20 according to an embodiment of the present invention includes a conductive tip 201, a switching unit 202 connected to the conductive tip 201, a receiving unit 203, a validity checking unit 204, a pen driving signal generator 205, a parameter selector 206, and a transmitting unit 207. During the touch driving period TP, the active stylus 20 sequentially outputs the first pen driving signal PD1 and the second pen driving signal PD2 in synchronization with the touch driving signal TS.
The conductive tip 201 is formed of a conductive material such as metal, and functions as a receiving electrode and a transmitting electrode. When the conductive tip 201 contacts the touch screen TSP of the display device 10, the conductive tip 201 is coupled with the touch screen TSP at the contact position. After the conductive tip 201 receives the touch driving signal TS from the touch screen TSP at the contact position, the conductive tip 201 transmits a pen driving signal PS generated inside the active stylus 20 in synchronization with the touch screen driving signal TS to the contact position of the touch screen TSP. Since the conductive tip 201 serves as a receiving electrode and a transmitting electrode, the active stylus pen has an advantage of simple structure.
When the conductive tip 201 contacts the touch screen TSP of the display device 10, the switching unit 202 temporally separates a reception timing of the touch driving signal TS from a transmission timing of the pen driving signal PS. The switching unit 202 transmits the touch driving signal TS input from the touch screen TSP to the receiving unit 203 through the conductive tip 201 in the Rx mode, and transmits the pen driving signal PS generated in the pen driving signal generator 205 to the touch screen TSP through the conductive tip 201 in the Tx mode.
The receiving unit 203 includes at least one amplifier and a comparator, and digitally processes the touch driving signal TS input through the switching unit 202.
After the validity checking unit 204 receives the touch driving signal TS from the receiving unit 203, the validity checking unit 204 analyzes the touch driving signal TS based on the validity condition of a predetermined default parameter set and checks the validity of the touch driving signal TS. More specifically, as shown in fig. 6, the validity checking unit 204 may determine that the touch driving signal TS is valid when N consecutive pulses of the touch driving signal TS satisfy a valid condition (e.g., a valid period PE and a valid duty ratio DT) of a predetermined default parameter set, where N is a positive integer equal to or greater than 2. In this case, the validity checking unit 204 changes the switching unit 202 from the Rx mode to the Tx mode.
When the validity checking unit 204 determines that the touch driving signal TS is valid, the pen driving signal generator 205 generates the pen driving signal PS synchronized with the touch driving signal TS with reference to the signal generation condition of the default parameter set. That is, the pen driving signal generator 205 may generate the pen driving signal PS synchronized with the touch driving signal TS based on the signal generation condition (e.g., period, duty ratio, number, etc.) of the default parameter set loaded into the register after a predetermined time elapses from the transition time point of the Tx mode.
The pen driving signal PS includes a first pen driving signal PD1 for detecting a touch input and a second pen driving signal PD2 for detecting an additional input related to an additional function of the active stylus 20. The first pen driving signal PD1 is synchronized with the first frequency f1 component of the touch driving signal TS, and the second pen driving signal PD2 is synchronized with the second frequency f2 component of the touch driving signal TS. The touch driving signal TS may be input at the first frequency f1 during the first period of the touch driving period TP, and may be input at the second frequency f2 during the second period of the touch driving period TP. In the embodiment of the present invention, the first frequency f1 and the second frequency f2 may be different from each other as shown in fig. 11, or may be substantially the same as each other as shown in fig. 12.
Referring to fig. 12, when the first frequency f1 and the second frequency f2 are identical to each other, the second pen driving signal PD2 has the same frequency as the first pen driving signal PD 1. On the other hand, referring to fig. 11, when the first frequency f1 and the second frequency f2 are different from each other, the second pen driving signal PD2 has a different frequency from the first pen driving signal PD 1. In order to transmit much more information related to additional functions during the fixed period of the second period, the frequency of the second pen driving signal PD2 may be higher than that of the first pen driving signal PD1 by making the second frequency f2 higher than the first frequency f 1.
The pen driving signal generator 205 may generate the second pen driving signal PD2 synchronized with the second frequency f2 component of the touch driving signal TS through the amplitude modulation method shown in fig. 7. The pen driving signal generator 205 implements predetermined various additional functions using the second pen driving signal PD2, wherein the second pen driving signal PD2 represents digital information "1" using a first voltage level V1 and represents digital information "0" using a second voltage level V2 which is less than the first voltage level V1. According to the amplitude modulation method, the second pen driving signal PD2 may be configured with various combinations of the first voltage level V1 and the second voltage level V2, for example, various combinations of a plurality of first pulses respectively having the first amplitude a1 and a plurality of second pulses respectively having the second amplitude a 2. The pen driving signal generator 205 may generate the second pen driving signal PD2 synchronized with the second frequency f2 component of the touch driving signal TS through a frequency modulation method shown in fig. 8. The pen driving signal generator 205 implements various predetermined additional functions using the second pen driving signal PD2, wherein the second pen driving signal PD2 represents digital information "1" using a first frequency fa and digital information "0" using a second frequency fb faster than the first frequency fa. According to the frequency modulation method, the second pen driving signal PD2 may be configured with various combinations of the first frequency fa and the second frequency fb, for example, various combinations of a plurality of first pulses each having a first pulse width W1 and a plurality of second pulses each having a second pulse width W2. Since the width and frequency of the second pen driving signal PD2 are inversely proportional to each other, the pulse width W1 associated with the first frequency fa is greater than the pulse width W2 associated with the second frequency fb.
More specifically, as shown in fig. 12, when the touch driving signal TS has the same frequency for the first and second periods SS1 and SS2, the second pen driving signal PD2 has the same frequency as the first pen driving signal PD1, and as shown in fig. 7, may further include a plurality of first pulses respectively having a first amplitude a1 and a plurality of second pulses respectively having a second amplitude a2 different from the first amplitude a 1.
Further, as shown in fig. 12, when the touch driving signal TS has the same frequency for the first and second periods SS1 and SS2, the second pen driving signal PD2 has the same frequency as the first pen driving signal PD1, and as shown in fig. 8, may further include a plurality of first pulses respectively having a first pulse width W1 and a plurality of second pulses respectively having a second pulse width W2 different from the first pulse width W1.
As shown in fig. 11, when the frequency of the touch driving signal TS in the second period SS2 is higher than the first period SS1, the second pen driving signal PD2 has a higher frequency than the first pen driving signal PD1, and as shown in fig. 7, may further include a plurality of first pulses respectively having a first amplitude a1 and a plurality of second pulses respectively having a second amplitude a2 different from the first amplitude a 1.
Further, as shown in fig. 11, when the frequency of the touch driving signal TS in the second period SS2 is higher than the first period SS1, the second pen driving signal PD2 has a higher frequency than the first pen driving signal PD1, and as shown in fig. 8, may further include a plurality of first pulses respectively having a first pulse width W1 and a plurality of second pulses respectively having a second pulse width W2 different from the first pulse width W1.
The transmission unit 207 includes a level shifter. Accordingly, the transmitting unit 207 amplifies the voltage level of the pen driving signal PS input from the pen driving signal generator 205, and then supplies the amplified pen driving signal PS to the switching unit 202.
Fig. 9 shows a touch driving apparatus included in the display apparatus shown in fig. 2. Fig. 10 shows a structure of a touch driving apparatus for digitally processing a sensing value of a second pen driving signal. Fig. 11 and 12 are waveform diagrams showing operation timings of the touch driving apparatus shown in fig. 9.
The touch driving device 18 according to an embodiment of the present invention may be implemented as an Integrated Circuit (IC) package.
Referring to fig. 9 to 12, the touch driving device 18 includes a touch integrated IC SRIC and a microcontroller MCU. The touch integrated ICSRIC includes a sensing unit SUT, an analog-to-digital converter ADC, a comparator COMP, a digital controller CTR, a switching unit SW, and the like.
The sensing unit SUT is connected to a sensor line of the touch screen TSP and provides a touch driving signal TS to the touch screen TSP. In addition, the sensing unit SUT senses a touch input generated by the first pen driving signal PD1 and senses an additional pen input generated by the second pen driving signal PD 2. To this end, the sensing unit SUT includes a touch driving signal providing unit (not shown), a touch sensor channel unit (or channel multiplexer), a plurality of sensing units AFE, and a multiplexer unit MUX. The touch sensor channel unit is connected to electrodes of the touch sensors through sensor lines (or Rx electrode lines). The touch sensor channel unit connects the sensor line to the sensing unit AFE. The sensing unit AFE senses an amount of charge of the touch sensor input through the sensor line. The sensing unit AFE senses an amount of electric charge generated by the first pen driving signal PD1 input through the touch screen TSP during a first period SS1 of the touch driving period TP, and senses an amount of electric charge generated by the second pen driving signal PD2 input through the touch screen TSP during a second period SS2 after the first period SS1 of the touch driving period TP. The multiplexer unit MUX selectively connects each sensing unit AFE to the switching unit SW in response to the touch sync signal Tsync in the first to nth touch driving periods (see fig. 11 and 12).
The switching unit SW performs a switching operation in response to the time division control signal CONT from the digital controller CTR. The switching unit SW connects the output terminal of the sensing unit SUT to the input terminal of the analog-to-digital converter ADC during the first period SS1 of each of the first to nth touch driving periods. Further, during the second period SS2 of each of the first to nth touch driving periods, the switching unit SW connects the output terminal of the sensing unit SUT to the input terminal of the comparator COMP.
During the first period SS1 of each of the first to nth touch driving periods, the analog-to-digital converter ADC converts an analog sensing value corresponding to the touch input, that is, the amount of charge generated according to the first pen driving signal PD1, into a digital touch sensing value.
During the second period SS2 of each of the first to nth touch driving periods, the comparator COMP compares an analog sensing value corresponding to an additional input, that is, an amount of electric charge generated according to the second pen driving signal PD2, with a predetermined reference value Vref and generates a digital additional sensing value. When the second pen driving signal PD2 is configured as a combination of the first voltage level V1 and the second voltage level V2 according to the amplitude modulation method shown in fig. 7, the amount of charge generated by the first voltage level V1 may be greater than the reference value Vref and thus may be generated as digital information "1"; the amount of charge generated by the second voltage level V2 may be less than the reference value Vref, and thus may be generated as digital information "0". Further, when the second pen driving signal PD2 is configured as a combination of the first frequency fa and the second frequency fb according to the frequency modulation method shown in fig. 8, the amount of charge generated by the first frequency fa may be larger than the reference value Vref and thus may be generated as digital information "1"; the amount of charge generated by the second frequency fb may be smaller than the reference value Vref and thus may be generated as digital information "0".
The digital controller CTR stores the digital touch sensing value from the analog-to-digital converter ADC in the first memory and the digital additional sensing value from the comparator COMP in the second memory. The digital controller CTR generates a time-division control signal CONT for dividing each of the first to nth touch driving periods into a first period SS1 and a second period SS2, and supplies the time-division control signal CONT to the switching unit SW. The digital controller CTR transmits the digital touch sensing value stored in the first memory and the digital additional sensing value stored in the second memory to the micro controller unit MCU through a Serial Peripheral Interface (SPI).
The micro controller unit MCU calculates coordinate values of the touch input based on the digital touch sensing values and generates information related to additional functions of the active stylus based on the digital additional sensing values. The micro controller unit MCU then sends the touch coordinate information XY and the information PAF related to the pen attachment function to the host system.
Fig. 13 and 14 show second pen driving signals generated in three states in synchronization with touch driving signals in an active stylus according to an embodiment of the present invention. Fig. 15 shows the amount of information that can be transmitted when the second pen driving signal is generated in three states.
Referring to fig. 13 and 14, the active stylus generates first Pen driving signals Pen1, … …, Pen4, … … in some touch driving periods TP of one frame, and generates second Pen driving signals Data1, … …, Data6, … … in the remaining touch driving periods TP of one frame. The display driving period DP is inserted between the period in which the first Pen driving signals Pen1, … …, Pen4, … … are transmitted and the period in which the second Pen driving signals Data1, … …, Data6, … … are transmitted, and output to the touch screen. The first Pen driving signals Pen1, … …, Pen4, … … are generated in the first period of the touch driving period, the second Pen driving signals Data1, … …, Data6, … … are generated in the second period of the touch driving period, and the first period of the touch driving period and the second period of the touch driving period, which are intermediately inserted into the display driving period TP, are set at different touch driving periods TP.
When the second pen driving signals Data1, … …, Data6, … … representing additional inputs related to the pen additional functions are output to the touch screen in the individual touch driving period TP, the sensing sensitivity of the additional inputs can be improved. Further, since the display driving period DP is inserted between the transmission period of the first Pen driving signals Pen1, … …, Pen4, … … and the transmission period of the second Pen driving signals Data1, … …, Data6, … … output to the touch screen, the sensing Data can be processed during the display driving period DP. Therefore, the time required for processing data can be sufficiently secured.
The second pen driving signals Data1, … …, Data6, … … may have three states, thereby increasing the amount of information transmission related to additional input. For example, the second pen driving signals Data1, … …, Data6, … … having three states may include a first state (represented by "0") signal having the same phase as the touch driving signal TS, a second state (represented by "1") signal having the opposite phase to the touch driving signal TS, and a third state (represented by "passive") signal for not driving the active stylus.
When the second pen driving signals Data1, … …, Data6, … … are implemented in three states, much more information related to additional functions can be transferred with a limited amount of Data because the embodiment of the present invention can generate an effect of 3-bit Data using 2-bit Data. Therefore, a high-performance active stylus is easily implemented. In addition, since the three-state second pen driving signals can achieve the same performance with a shorter driving time, the three-state second pen driving signals can effectively reduce power consumption, as compared to the case where the second pen driving signals are implemented in two states ("0" and "1").
For example, as shown in fig. 15, when the second pen driving signals Data1, … …, Data6, … … are implemented in three states, 27 kinds of information can be transmitted in the case of three symbols. On the other hand, when the second pen driving signals Data1, … …, Data6, … … are implemented in two states, only 8 kinds of information can be transmitted in the case of three symbols.
Although not shown in fig. 13 and 14, the touch driving signal TS may have the same frequency in a first period of the touch driving period in which the first Pen driving signals Pen1, … …, Pen4, … … are generated and in a second period of the touch driving period in which the second Pen driving signals Data1, … …, Data6, … … are generated.
In this case, the second Pen driving signals Data1, … …, Data6, … … may have the same frequency as the first Pen driving signals Pen1, … …, Pen4, … …, and may further include a first state (represented by "0") signal having the same phase as the touch driving signal TS, a second state (represented by "1") signal having the opposite phase to the touch driving signal TS, and a third state (represented by "passive") signal for not driving the active stylus.
Although not shown in fig. 13 and 14, the frequency of the touch driving signal TS in the second period of the touch driving period in which the second Pen driving signals Data1, … …, Data6, … … are generated may be higher than the frequency in the first period of the touch driving period in which the first Pen driving signals Pen1, … …, Pen4, … … are generated.
In this case, the frequency of the second Pen driving signals Data1, … …, Data6, … … may be higher than that of the first Pen driving signals Pen1, … …, Pen4, … …, and may further include a first state (denoted by "0") signal having the same phase as the touch driving signal TS, a second state (denoted by "1") signal having an opposite phase to the touch driving signal TS, and a third state (denoted by "passive") signal for not driving the active stylus.
In fig. 13, "beacon (beacon)" represents a signal indicating a pen frequency, a pen driving method (e.g., contact, hovering, etc.), a driving state of the display panel (e.g., basic driving, low power driving, etc.), and the like to the active stylus pen.
The embodiments of the present invention have the following effects.
First, the embodiment of the invention can accurately receive digital additional information (e.g., pressure, key, pen ID, etc.) transmitted from the pen by adding a circuit for digitally processing a sensing value of the second pen driving signal to the existing integrated touch driving device.
Second, since the embodiment of the invention temporally separates and outputs the touch driving signal including the first pen driving signal and the second pen driving signal, more accurate information can be transmitted.
Third, embodiments of the present invention can transmit information related to pen pressure of 2048 or more at the same rate as touch report rate (touch report) through digital additional information.
Fourth, embodiments of the present invention can transmit two or more key information (including clear information, scroll information, etc.) through the number added information.
Fifth, the embodiment of the present invention can transmit the pen ID through the digital additional information while being able to recognize a plurality of pens.
Sixth, embodiments of the present invention can process the digital additional information into three states and transmit much more information within a limited time.
Although embodiments have been described with reference to a number of illustrative embodiments, numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the scope of the principles of this invention. In particular, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the description, the drawings and the appended claims. In addition to various variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art.
Claims (10)
1. A touch sensing system in which one frame is time-divided into at least one touch driving period and one display driving period, the touch sensing system comprising:
a touch screen;
an active stylus for generating a first pen driving signal and a second pen driving signal synchronized with a touch driving signal and outputting the first pen driving signal and the second pen driving signal to the touch screen, wherein the second pen driving signal is used for detecting an additional input related to an additional function of the active stylus in the touch driving period; and
a touch driving device for providing the touch driving signal to the touch screen, sensing a first pen driving signal input through the touch screen in a first period of the touch driving period, and sensing a second pen driving signal input through the touch screen in a second period of the touch driving period,
wherein the second pen drive signal comprises a plurality of state signals including a first state signal, a second state signal, and a third state signal,
wherein the first state signal comprises a plurality of pulses having the same phase as the touch driving signal, the second state signal comprises a plurality of pulses having an opposite phase to the touch driving signal, and the third state signal indicates that the active stylus is not driven.
2. The touch sensing system of claim 1, wherein the active stylus outputs the first pen drive signal and the second pen drive signal to the touch screen sequentially, and,
wherein the first period and the second period are successively set within the same touch driving period.
3. The touch sensing system of claim 2, wherein the active stylus generates a second stylus drive signal synchronized with the touch drive signal by an amplitude modulation method or a pulse width modulation method.
4. The touch sensing system of claim 1, wherein the active stylus outputs the first pen drive signal and the second pen drive signal to the touch screen with the display drive period interposed between the period for transmitting the first pen drive signal and the period for transmitting the second pen drive signal, and
wherein the first period and the second period are set within different touch driving periods with the display driving period interposed therebetween.
5. The touch sensing system of claim 1, wherein the touch driving device comprises:
a sensing unit connected to the sensor lines of the touch screen and sensing a touch input generated by the first pen driving signal and sensing an additional input generated by the second pen driving signal;
an analog-to-digital converter for converting an analog sensing value corresponding to the touch input into a digital touch sensing value;
a comparator for comparing an analog sensing value corresponding to the additional input with a predetermined reference value and generating a digital additional sensing value;
a digital controller for storing the digital touch sensing value in a first memory, storing the digital additional sensing value in a second memory, and generating a time division control signal for dividing each touch driving period into the first period and the second period;
a switching unit performing a switching operation in response to the time division control signal, for connecting the sensing unit with the analog-to-digital converter during the first period, and connecting the sensing unit with the comparator during the second period; and
a microcontroller unit for calculating coordinate values of the touch input based on the digital touch sensing values and generating information related to an additional function of the active stylus based on the digital additional sensing values.
6. A touch driving apparatus in which one frame is time-divided into at least one touch driving period and one display driving period and the touch driving apparatus operates in the at least one touch driving period,
wherein the touch driving apparatus is configured to generate a touch driving signal during the touch driving period, provide the touch driving signal to a touch screen, sense a first pen driving signal provided from an active stylus to the touch screen during a first period of the touch driving period, and sense a second pen driving signal provided from the active stylus to the touch screen during a second period of the touch driving period,
wherein the first pen driving signal and the second pen driving signal are synchronized with the touch driving signal,
the first pen driving signal is used for detecting touch input, the second pen driving signal is used for detecting additional input related to additional functions of the active stylus,
wherein the second pen drive signal comprises a plurality of state signals including a first state signal, a second state signal, and a third state signal,
wherein the first state signal comprises a plurality of pulses having the same phase as the touch driving signal, the second state signal comprises a plurality of pulses having an opposite phase to the touch driving signal, and the third state signal indicates that the active stylus is not driven.
7. The touch driving apparatus of claim 6, wherein the first pen driving signal and the second pen driving signal are sequentially provided to the touch screen, and
wherein the first period and the second period are sequentially set within the same touch driving period.
8. The touch driving apparatus of claim 7, wherein the second pen driving signal synchronized with the touch driving signal is generated by an amplitude modulation method or a pulse width modulation method.
9. The touch driving apparatus of claim 6, wherein the first pen driving signal and the second pen driving signal are supplied to the touch screen with the display driving period interposed between a period for transmitting the first pen driving signal and a period for transmitting the second pen driving signal, and
wherein the first period and the second period are set within different touch driving periods with the display driving period interposed therebetween.
10. The touch driving apparatus according to claim 6, wherein the touch driving apparatus comprises:
a sensing unit connected to the sensor lines of the touch screen and sensing a touch input generated by the first pen driving signal and sensing an additional input generated by the second pen driving signal;
an analog-to-digital converter for converting an analog sensing value corresponding to the touch input into a digital touch sensing value;
a comparator for comparing an analog sensing value corresponding to the additional input with a predetermined reference value and generating a digital additional sensing value;
a digital controller for storing the digital touch sensing value in a first memory, storing the digital additional sensing value in a second memory, and generating a time division control signal for dividing each touch driving period into the first period and the second period;
a switching unit performing a switching operation in response to the time division control signal, for connecting the sensing unit with the analog-to-digital converter during the first period, and connecting the sensing unit with the comparator during the second period; and
a microcontroller unit for calculating coordinate values of the touch input based on the digital touch sensing values and generating information related to an additional function of the active stylus based on the digital additional sensing values.
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| KR20150191807 | 2015-12-31 | ||
| KR1020160163495A KR102607842B1 (en) | 2015-12-31 | 2016-12-02 | Touch sensing system including active stylus pen |
| KR10-2016-0163495 | 2016-12-02 |
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| CN106997255A CN106997255A (en) | 2017-08-01 |
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| US10528158B2 (en) * | 2017-08-07 | 2020-01-07 | Himax Technologies Limited | Active stylus, touch sensor, and signal transmission and sensing method for active stylus and touch sensor |
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| KR102410015B1 (en) * | 2017-12-27 | 2022-06-16 | 삼성전자주식회사 | Touch screen controller, Touch screen system having the same and Operating method of touch screen controller |
| KR102457994B1 (en) * | 2018-06-14 | 2022-10-24 | 엘지디스플레이 주식회사 | Touch display device, micro controller, and driving method |
| KR102552745B1 (en) | 2018-07-19 | 2023-07-06 | 주식회사 엘엑스세미콘 | Touch driving device and display device |
| KR102610819B1 (en) | 2018-08-10 | 2023-12-07 | 주식회사 엘엑스세미콘 | Touch driving device and display device |
| AU2018456082B2 (en) * | 2018-09-30 | 2022-08-11 | Huawei Technologies Co., Ltd. | Stylus detection method, system, and related device |
| KR102595142B1 (en) * | 2018-12-20 | 2023-10-27 | 엘지디스플레이 주식회사 | Active pen and touch display |
| KR102738511B1 (en) * | 2018-12-26 | 2024-12-06 | 주식회사 엘엑스세미콘 | Touch sensing apparatus and touch sensing system |
| KR102601347B1 (en) * | 2018-12-28 | 2023-11-13 | 엘지디스플레이 주식회사 | Touch display device and touch sensing circuit |
| KR102628784B1 (en) * | 2019-12-24 | 2024-01-23 | 엘지디스플레이 주식회사 | Display apparatus with touch panel |
| KR102689658B1 (en) * | 2019-12-24 | 2024-07-30 | 엘지디스플레이 주식회사 | Touch display device, pen, and pen sensing method |
| CN112817466B (en) * | 2021-02-26 | 2024-05-10 | 奕力科技股份有限公司 | Touch device and touch pen thereof |
| TWI774265B (en) | 2021-03-12 | 2022-08-11 | 元太科技工業股份有限公司 | Driving circuit of display and operation method of timing controller |
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| JP5345050B2 (en) * | 2009-12-25 | 2013-11-20 | 株式会社ワコム | Indicator, position detection device and position detection method |
| WO2013018736A1 (en) * | 2011-07-29 | 2013-02-07 | シャープ株式会社 | Display device |
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| US8982090B2 (en) * | 2012-01-01 | 2015-03-17 | Cypress Semiconductor Corporation | Optical stylus synchronization |
| KR101282430B1 (en) * | 2012-03-26 | 2013-07-04 | 삼성디스플레이 주식회사 | Stylus, pressure detecting system and the driving method thereof |
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| KR101560535B1 (en) * | 2012-12-11 | 2015-10-15 | 엘지디스플레이 주식회사 | Display device with integrated touch screen and method for driving the same |
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| CN106997255A (en) | 2017-08-01 |
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