KR20130028360A - Apparatus and method for driving touch screen - Google Patents

Apparatus and method for driving touch screen Download PDF

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Publication number
KR20130028360A
KR20130028360A KR1020110091854A KR20110091854A KR20130028360A KR 20130028360 A KR20130028360 A KR 20130028360A KR 1020110091854 A KR1020110091854 A KR 1020110091854A KR 20110091854 A KR20110091854 A KR 20110091854A KR 20130028360 A KR20130028360 A KR 20130028360A
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South Korea
Prior art keywords
touch
scanning period
during
lines
touch input
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KR1020110091854A
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Korean (ko)
Inventor
김덕영
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엘지디스플레이 주식회사
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Priority to KR1020110091854A priority Critical patent/KR20130028360A/en
Publication of KR20130028360A publication Critical patent/KR20130028360A/en

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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input 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
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/0354Pointing 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
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input 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
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416Control or interface arrangements specially adapted for digitisers
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters

Abstract

PURPOSE: An apparatus and method for driving a touch screen are provided to reduce power consumption by successively supplying a driving pulse to a part of Tx lines and precisely scanning a touch input region and a peripheral region when a touch input is detected. CONSTITUTION: A driving pulse is successively supplied to odd Tx lines for a first group scanning period. The odd lines of a touch screen are scanned(S1). A touch input region is precisely detected by supplying the driving pulse to even Tx lines passing the touch input region and the peripheral region(S2,S3). The driving pulse is successively supplied to the odd Tx lines for a second group scanning period. The even lines of the touch screen are scanned(S4). The touch input region is precisely detected by supplying the driving pulse to the odd Tx lines passing the touch input region and the peripheral region(S5,S6). [Reference numerals] (AA,CC) Yes; (BB,DD) No; (S1) Scanning an odd line; (S2,S5) Detecting touch(or proximity) input?; (S3) Scanning an even line around a touch(or proximity) input region; (S4) Scanning the even line; (S6) Scanning the odd line around the touch(or proximity) input region

Description

Touch screen driving device and method {APPARATUS AND METHOD FOR DRIVING TOUCH SCREEN}

The present invention relates to a touch screen driving device and method.

A user interface (UI) enables communication between a person (user) and various electric or electronic devices, allowing a user to easily control the device as desired. Representative examples of such a user interface include a keypad, a keyboard, a mouse, an on screen display (OSD), a remote controller having infrared communication or radio frequency (RF) communication function, and the like. User interface technology has been developed to enhance the user's sensibility and ease of operation. Recently, the user interface has evolved into a touch UI, a voice recognition UI, a 3D UI, and the like.

Touch UI is becoming a necessity for portable information devices and is being applied to household appliances. As an example of a touch screen for implementing a touch UI, recently, a mutual capacitance type touch screen capable of sensing proximity as well as touch and recognizing each of multiple touches (or proximity) has been in the spotlight.

The mutual capacitive touch screen includes Tx lines, Rx lines intersecting the Tx lines, and sensor nodes formed at the intersection of the Tx lines and the Rx lines. Each of the sensor nodes has a mutual capacity. The touch screen driving device senses a change in the voltage charged in the sensor nodes before and after the touch (or proximity) to judge whether or not the conductive material is in contact (or proximity) and its position.

In order to sense the voltage charged in the sensor node, a driving pulse is sequentially applied to the Tx lines to transmit the voltage of the sensor node to the Rx driving circuit through the Rx lines. The Rx driving circuit samples the minute voltage change of the sensor node in synchronization with the driving pulse and performs analog to digital conversion. In the touch screen scanning method, driving pulses are sequentially applied to the Tx lines, and the Rx driving circuit performs a sampling of the sensor node voltage and an analog-to-digital conversion operation for each of the sensor nodes. Since the total sensing time required to sense all the sensor nodes is long, the scanning period is long, resulting in low touch (close proximity) detection speed.

The present invention provides a touch screen driving apparatus and method that can reduce power consumption and speed up a scanning cycle of a touch screen.

The touch screen driver of the present invention includes a touch recognizable area including Tx lines, Rx lines intersecting the Tx lines, and sensor nodes formed at intersections of the Tx lines and the Rx lines, A touch screen in which the touch recognizable area is divided into two or more blocks; The driving pulses are sequentially supplied to some of the Tx lines during the group scanning period, and when the touch scan is detected as a result of the group scanning, the driving pulse is shifted to the partial scanning period so that only some Tx lines passing through the touch input region and its peripheral region are provided. A touch screen driving circuit which sequentially supplies the driving pulses to precisely scan the touch input area and its surrounding area; And a touch controller controlling driving of the touch screen driving circuit and calculating coordinates of the touch input area by analyzing data with a touch input from the touch screen driving circuit.

According to an aspect of the present invention, there is provided a method of driving a touch screen, the method including sequentially supplying driving pulses to some of the Tx lines during a group scanning period; When a touch input is detected as a result of scanning in the group scanning period, the process shifts to a partial scanning period and sequentially supplies the driving pulse to only some Tx lines passing through the touch input region and the peripheral region, thereby providing the touch input region and the peripheral region. Precise scanning; And calculating coordinates of the touch input area.

The present invention sequentially supplies driving pulses to some of the Tx lines during the group scanning period and precisely rescans the touch input area and its surrounding area only when a touch input is detected. Therefore, the present invention can reduce the power consumption of the touch screen and speed up the scanning period of the touch screen.

1 is a block diagram showing a display device according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a touch screen driving device in FIG. 1.
3 to 5 illustrate various embodiments of a touch screen and a display panel.
6 is a flowchart illustrating a touch screen driving method according to an embodiment of the present invention.
7 is a diagram illustrating a group scanning period and a partial scanning period.
8 is a diagram illustrating an example of a first group scanning operation.
FIG. 9 is a waveform diagram illustrating driving pulses supplied to odd-numbered Tx lines in a first group scanning operation as illustrated in FIG. 8.
10 is a diagram illustrating an example of a first partial scanning operation.
FIG. 11 is a waveform diagram illustrating driving pulses supplied to even-numbered Tx lines passing through the touch input area in the first partial scanning operation as illustrated in FIG. 10.
12 is a diagram illustrating an example of a second group scanning operation.
FIG. 13 is a waveform diagram illustrating a driving pulse supplied to even-numbered Tx lines in a second group scanning operation as illustrated in FIG. 12.
14 is a diagram illustrating an example of a second partial scanning operation.
FIG. 15 is a waveform diagram illustrating driving pulses supplied to the odd-numbered Tx lines passing through the touch input area in the second partial scanning operation as illustrated in FIG. 14.
16A to 16F illustrate a touch screen driving method according to another exemplary embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Like reference numerals throughout the specification denote substantially identical components. In the following description, when it is determined that a detailed description of known functions or configurations related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 and 2, a display device according to an exemplary embodiment of the present invention may include a display panel DIS, a display driving circuit, a timing controller 20, a touch screen TSP, a touch screen driving circuit, and a touch controller 30. ), And the like.

The display device of the present invention is a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), an organic light emitting diode display (Organic Light Emitting Display) , OLED), and electrophoretic display devices (Electrophoresis, EPD) can be implemented based on a flat panel display device. In the following embodiments, a display device is described as a liquid crystal display device as an example of a flat panel display device, but it should be noted that the display device of the present invention is not limited to a liquid crystal display device.

In the display panel DIS, a liquid crystal layer is formed between two substrates. The lower substrate of the display panel DIS includes a plurality of data lines D1 to Dm and m are natural numbers, a plurality of gate lines G1 to Gn and n are natural numbers intersecting the data lines D1 to Dm. A plurality of TFTs formed at intersections of the data lines D1 to Dm and the gate lines G1 to Gn, a plurality of pixel electrodes for charging data voltages to liquid crystal cells, and a pixel electrode And a storage capacitor to maintain the voltage of the liquid crystal cell.

The pixels of the display panel DIS are formed in a pixel region defined by the data lines D1 to Dm and the gate lines G1 to Gn and arranged in a matrix form. Each liquid crystal cell of the pixels is driven by an electric field applied according to a voltage difference between a data voltage applied to the pixel electrode and a common voltage applied to the common electrode to control the amount of incident light. The TFTs are turned on in response to gate pulses from the gate lines G1 to Gn to supply a voltage from the data lines D1 to Dm to the pixel electrodes of the liquid crystal cell.

The upper substrate of the display panel DIS may include a black matrix, a color filter, and the like. The lower substrate of the display panel DIS may be implemented with a COT (Color Filter On TFT) structure. In this case, the black matrix and the color filter can be formed on the lower substrate of the display panel DIS.

Polarizing plates are attached to each of the upper and lower substrates of the display panel DIS to form an alignment layer for setting a pretilt angle of the liquid crystal on an inner surface of the display panel DIS. A column spacer for maintaining a cell gap of the liquid crystal cell is formed between the upper substrate and the lower substrate of the display panel DIS.

A backlight unit may be disposed on the back surface of the display panel DIS. The backlight unit is implemented as an edge type or direct type backlight unit to emit light to the display panel DIS. The display panel DIS may be implemented in any known liquid crystal mode such as TN (Twisted Nematic) mode, VA (Vertical Alignment) mode, IPS (In Plane Switching) mode and FFS (Fringe Field Switching) mode.

The display driver circuit includes a data driver circuit 12 and a scan driver circuit 14 to write the video data voltage of the input image to the pixels. The data driving circuit 12 converts the digital video data RGB input from the timing controller 20 into an analog positive / negative gamma compensation voltage and outputs a data voltage. The data voltage is supplied to the data lines D1 to Dm. The scan driving circuit 14 sequentially supplies a gate pulse (or a scan pulse) synchronized with the data voltage to the gate lines G1 to Gn to select a line of the display panel DIS to which the data voltage is written.

The timing controller 20 receives timing signals such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable signal Data Enable, and a main clock MCLK input from an external host system. A scan timing control signal and a data timing control signal for controlling the operation timing of the data driver circuit 12 and the scan driver circuit 14 are generated. The scan timing control signal includes a gate start pulse (GSP), a gate shift clock, a gate output enable signal (GOE), and the like. The data timing control signal includes a source sampling clock (SSC), a polarity control signal (Polarity), a source output enable signal (SOE), and the like.

The touch screen TSP may be bonded to the upper polarizing plate POL1 of the display panel DIS as shown in FIG. 3, or may be formed between the upper polarizing plate POL1 and the upper substrate GLS1 as shown in FIG. 4. In addition, the sensor nodes of the touch screen TSP may be formed on the lower substrate in an in-cell type together with the pixel array in the display panel DIS as shown in FIG. 5. In Fig. 3 to Fig. 5, "PIX" means a pixel electrode of a liquid crystal cell, "GLS2" means a lower substrate, and "POL2" means a lower polarizer.

The touch screen TSP includes Tx lines (T1 to Tj, j is a positive integer less than n), Rx lines (R1 to Ri, i being an amount less than m) crossing the Tx lines Integer), and ixj sensor nodes TSN formed at intersections of Tx lines T1 to Tj and Rx lines R1 to Ri.

The touch screen driving circuit scans only some lines of the touch screen under the control of the touch controller 30, and when a touch (or proximity) input is detected as a result of the scanning, the touch (or proximity) input area and a constant area around it Scan precisely. For example, the touch screen driving circuit may scan the odd-numbered lines of the touch screen during the first group scanning period TG (ODD LINE) as shown in FIGS. 6 to 15 under the control of the touch controller 30. When the touch (or proximity) is detected, only the touch (or proximity) input area and the peripheral area thereof are precisely scanned during the first partial scanning period TP. Subsequently, the touch screen driving circuit scans the even lines of the touch screen during the second group scanning period TG (EVEN LINE) under the control of the touch controller 30, and then touches (or proximity) the second screen. Only the touch (or proximity) input area and its surrounding area are precisely scanned during TP) If the touch (or proximity) input is not detected in the group scanning period, the partial scanning period TP is omitted, and the partial scanning period TP ) Is a variable scanning period, which is longer as the number of touch (or proximity) inputs increases, thus reducing the power consumption and increasing the scanning period of the touch screen up to twice as fast as the prior art. In addition, the touch screen driving apparatus of the present invention may perform a touch (or Close-up) it is possible to increase the touch sensitivity and accuracy by the final determination whether or not the input position and.

The touch screen driving circuit includes a Tx driving circuit 32 and an Rx driving circuit 34. The Tx driving circuit 32 and the Rx driving circuit 34 may be integrated in one read-out IC (ROIC).

The Tx driving circuit 32 sets a Tx channel to which a driving pulse is supplied in response to a setup signal input from the touch controller 30, and supplies driving pulses to Tx lines T1 to Tj connected to the set Tx channel. . The Tx driving circuit 32 sequentially drives driving pulses on the odd-numbered Tx lines T1, T3, ... Tj-1 during the first group scanning period TG (ODD LINE) under the control of the touch controller 30. When the touch (or proximity) input is detected, the driving pulse is supplied only to even-numbered Tx lines passing through the touch (or proximity) input region and the peripheral region during the first partial scanning period TP. The Tx driving circuit 32 sequentially supplies driving pulses to even-numbered Tx lines T2, T4... Tj during the second group scanning period TG (EVEN LINE) under the control of the touch controller 30. When the touch (or proximity) input is detected, the driving pulse is supplied only to the odd-numbered Tx lines passing through the touch (or proximity) input region and the peripheral region during the second partial scanning period TP. The charge amount of the sampling capacitor can be increased by repeatedly accumulating the voltage of the sensor node TSN (N is a natural number equal to or larger than 2) times and charging the sampling capacitor of the Rx driving circuit 34. In this case, the driving pulses applied to each of the Tx lines T1 to Tj may include N driving pulses continuously generated at predetermined time intervals.

The Rx driver circuit 34 sets an Rx channel to receive the sensor node voltage in response to the setup signal input from the touch controller 30. The Rx driving circuit 34 receives the voltage of the sensor node through the Rx line connected to the Rx channel set according to the setup signal, and samples the voltage of the sensor node using the sampling circuit. The Rx driving circuit 34 converts the sampled voltage into digital data using an analog to digital converter (ADC). The Rx driving circuit 34 activates all Rx channels during the group scanning period TG (ODD LINE) and TG (EVEN LINE) to sample and convert the voltage of the sensor node received through all Rx lines into digital data. The Rx driving circuit 34 activates all Rx channels during the partial scanning period TP to sample and convert the voltage of the sensor node received through all the Rx lines into digital data, or to further reduce the partial scanning period TP. Only the Rx channels of the Rx lines passing through the touch (or proximity) input region and its peripheral region can be activated to sample and digitally convert only the voltages of the sensor nodes received through the Rx lines. The digital data output from the Rx driver circuit 34 is transmitted to the touch controller 30 as touch raw data.

The touch controller 30 is connected to the Tx driving circuit 32 and the Rx driving circuit 34 through an interface such as an I 2 C bus, a serial peripheral interface (SPI), a system bus, or the like. In FIG. 1, "CTx" is a control signal transmitted from the touch controller 30 to the Tx driving circuit 32 and includes a Tx channel setup signal, a clock, and the like. "CRx" is a control signal transmitted from the touch controller 30 to the Rx driving circuit 34 and includes an Rx channel setup signal, a sampling clock, an ADC clock, and the like. The touch controller 30 supplies a setup signal to the Tx driving circuit 32 and the Rx driving circuit 34 to set the Tx channel through which the driving pulse STx is output, and selects the Rx channel from which the voltage of the sensor node is read. The touch controller 30 supplies an Rx sampling clock to the Rx driving circuit 34 for controlling the sampling timing of the sampling circuit built in the Rx driving circuit 34 to control the sampling timing of the sensor node voltage. The touch controller 30 controls the digital conversion timing of the sensor node voltage by supplying an ADC clock to an analog-to-digital converter embedded in the Rx driving circuit 34.

The touch controller 30 analyzes the data of the touch input from the Rx driver circuit 34 and converts the data whose change value of the sensor node voltage is larger than a predetermined threshold before and after the touch into touch data of the touch (or proximity) input area. By judging, the presence or absence of a touch (or proximity) input and a touch (or proximity) input position may be determined. Therefore, the touch controller 30 controls the Tx driving circuit 32 and the Rx driving circuit 34 in the partial sensing driving method when a touch (or proximity) input is detected as a result of group scanning.

The touch controller 30 analyzes touch raw data input from the Rx driver circuit 34 by using a preset touch recognition algorithm, estimates coordinate values of touch data having a large amount of change before and after a touch is greater than or equal to a predetermined reference value, and coordinate information. Outputs touch data including The touch data output from the touch controller 30 is transmitted to the host system. The touch controller 30 controls the Tx driving circuit 32 and the Rx driving circuit 34 to omit partial scanning when it is determined that there is no touch (or proximity) input as a result of group scanning. The touch controller 30 may be implemented as a micro controller unit (MCU) or a field-programmable gate array (FPGA).

The host system may be connected to an external video source device such as a navigation system, a set top box, a DVD player, a Blu-ray player, a personal computer (PC), a home theater system, a broadcast receiver, a phone system, Video data can be input from the device. The host system includes a system on chip (SoC) including a scaler to convert image data from an external video source device into a format suitable for display on the display panel DIS. In addition, the host system executes an application program associated with the coordinate value of the touch data input from the touch controller 30.

6 is a flowchart illustrating a touch screen driving method according to an embodiment of the present invention. 7 is a diagram illustrating a group scanning period and a partial scanning period.

6 and 7, the touch screen driving method of the present invention is applied to the odd-numbered Tx lines T1, T3,..., Tj-1 during the first group scanning period TG (ODD LINE). The driving pulses are sequentially supplied to scan the odd lines of the touch screen (TSP). (S1) In the touch screen driving method of the present invention, when a touch (or proximity) input is detected as a result of the first group scanning, the first partial scanning period is performed. During (TP), the driving pulse is supplied only to the even-numbered Tx lines passing through the touch (or proximity) input region and its peripheral region to accurately detect the touch (or proximity) input region. (S2 and S3) Touch of the Invention When the first group scanning result touch (or proximity) input is not detected, the screen driving method shifts to the second group scanning period TG (EVEN LINE).

The touch screen driving method of the present invention sequentially supplies driving pulses to even-numbered Tx lines T2, T4, ..., Tj during the second group scanning period TG (EVEN LINE), thereby providing a touch screen TSP. (S4) If the touch (or proximity) input of the second group scanning result is detected, the touch screen driving method according to the present invention may detect a touch (or proximity) input area during the second partial scanning period TP. The driving pulse is supplied only to the odd-numbered Tx lines passing through the peripheral area to detect the touch (or proximity) input area precisely. (S5 and S6) The touch screen driving method of the present invention uses the second group scanning result of touch If no input is detected, the process shifts to the first group scanning period TG (ODD LINE).

8 is a diagram illustrating an example of a first group scanning operation. FIG. 9 is a waveform diagram illustrating driving pulses supplied to odd-numbered Tx lines in a first group scanning operation as illustrated in FIG. 8. 10 is a diagram illustrating an example of a first partial scanning operation. FIG. 11 is a waveform diagram illustrating driving pulses supplied to even-numbered Tx lines passing through the touch input area in the first partial scanning operation as illustrated in FIG. 10.

The Tx driving circuit 32 operates under the control of the touch controller 30, and the radix-th Tx lines T1, T3, ... which are activated during the first group scanning period TG (ODD LINE) as shown in FIGS. 8 and 9. , Tj-1) is sequentially supplied with a driving pulse. The Rx driving circuit 34 samples the voltages of the sensor nodes TSN received through all of the Rx lines R1 to Ri during the first group scanning period TG (ODD LINE) and converts them into digital data. . The touch controller 30 analyzes touch input data from the Rx driver circuit 34 during the first group scanning period TG (ODD LINE) and calculates coordinates of the touch (or proximity) input. ODD LINE)), the touch controller 30 sets up Tx channels connected to the odd-numbered Tx lines T1, T3, ..., Tj-1 using the setup pulse as the active Tx channel, Deactivates the Tx channels connected to the Tx lines T2, T4, ..., Tj The touch controller 30 uses all the Rx lines using a setup pulse during the first group scanning period TG (ODD LINE). Set Rx channels connected to (R1 to Ri) as active Rx channels.

As a result of the first group scanning, the first and second touch inputs 21 and 22 may be detected as shown in FIG. 8. In this case, as illustrated in FIGS. 10 and 11, the Tx driving circuit 32 may include even-numbered Tx lines T2 and T4 passing through the first and second touch input regions and the peripheral region during the first partial scanning period TP. Only drive pulses are sequentially supplied to T8, T10, and T12). The Rx driving circuit 34 samples the voltages of the sensor nodes TSN received through all of the Rx lines R1 to Ri during the first partial scanning period TP, and converts the voltages into digital data. Likewise, only the voltages of the sensor nodes TSN received through the Rx lines R2 to R7 passing through the first and second touch input areas and the peripheral area thereof may be sampled and converted into digital data. The touch controller 30 analyzes touch raw data input from the Rx driver circuit 34 during the first partial scanning period TP to calculate coordinates of the touch (or proximity) input and uses the result as final touch coordinate value data. Output During this period TP, the touch controller 30 uses the setup pulse to activate only the Tx channels connected to the even-numbered Tx lines passing through the touch input area and its surrounding area, while the Tx channel connected to the remaining Tx lines. Disable them. The touch controller 30 may set Rx channels connected to all Rx lines R1 to Ri as an active Rx channel using a setup pulse during the first partial scanning period TP, or may pass through the touch input area and its surrounding area. Enable only Rx channels connected to Rx lines.

12 is a diagram illustrating an example of a second group scanning operation. FIG. 13 is a waveform diagram illustrating a driving pulse supplied to even-numbered Tx lines in a second group scanning operation as illustrated in FIG. 12. 14 is a diagram illustrating an example of a second partial scanning operation. FIG. 15 is a waveform diagram illustrating driving pulses supplied to the odd-numbered Tx lines passing through the touch input area in the second partial scanning operation as illustrated in FIG. 14.

The Tx driving circuit 32 performs the even-numbered Tx lines T2, T4, ... active during the second group scanning period TG as shown in FIGS. 12 and 13 under the control of the touch controller 30. , Tj) is sequentially supplied with a driving pulse. The Rx driving circuit 34 samples the voltages of the sensor nodes TSN received through all of the Rx lines R1 to Ri during the second group scanning period TG (EVEN LINE) and converts them into digital data. . The touch controller 30 calculates coordinates of the touch (or proximity) input by analyzing data with touch input from the Rx driving circuit 34 during the second group scanning period TG (EVEN LINE). EVEN LINE), the touch controller 30 sets up Tx channels connected with even-numbered Tx lines T2, T4, ..., Tj as active Tx channels using the setup pulse, while the odd-numbered Tx lines Deactivate Tx channels connected to the T1, T3, ..., Tj-1 touch controller 30 using the setup pulse during the second group scanning period TG (EVEN LINE). Set Rx channels connected to (R1 to Ri) as active Rx channels.

As a result of the second group scanning, the first and second touch inputs 23 and 24 may be detected as shown in FIG. 12. In this case, as shown in FIGS. 14 and 15, the Tx driving circuit 32 may include the odd-numbered Tx lines T5 and T7 passing through the first and second touch input regions and the peripheral region during the second partial scanning period TP. Only drive pulses T11 and T13 are sequentially supplied. During the second partial scanning period TP, the Rx driving circuit 34 samples the voltages of the sensor nodes TSN received through all of the Rx lines R1 to Ri and converts the voltages into digital data. Likewise, only the voltages of the sensor nodes TSN received through the Rx lines R2 to R4 and R10 to R12 passing through the first and second touch input regions and the peripheral region thereof may be sampled and converted into digital data. The touch controller 30 analyzes touch raw data input from the Rx driver circuit 34 during the second partial scanning period TP, calculates coordinates of the touch (or proximity) input, and outputs the result as final touch coordinate data. do. During this period TP, the touch controller 30 activates only the Tx channels connected to the radix Tx lines passing through the touch input area and its surrounding area using the setup pulse, while the Tx channel connected to the remaining Tx lines. Disable them. The touch controller 30 may set Rx channels connected to all Rx lines R1 to Ri as an active Rx channel using a setup pulse during the second partial scanning period TP, or may pass through the touch input area and its surrounding area. Enable only Rx channels connected to Rx lines.

16A to 16F illustrate a touch screen driving method according to another exemplary embodiment of the present invention. In this embodiment, the Tx driving circuit 32 and the Rx driving circuit 34 sequentially scan 3N (N is a positive integer) + first lines of the touch screen TSP during the first group scanning period, When a touch (or proximity) input is detected as a result of the first group scanning, the lines passing through the touch input region and the peripheral region detected during the first partial scanning period are precisely scanned. Subsequently, the Tx driving circuit 32 and the Rx driving circuit 34 sequentially scan the 3N + 2th lines of the touch screen TSP during the second group scanning period, and input the second group scanning result touch (or proximity). If detected, the lines passing through the touch input region and the peripheral region detected during the second partial scanning period are precisely scanned. Subsequently, the Tx driving circuit 32 and the Rx driving circuit 34 sequentially scan the 3N + 3th lines of the touch screen TSP during the third group scanning period, and input the third group scanning result touch (or proximity). If is detected, the lines passing through the touch input area and the peripheral area detected during the third partial scanning period are precisely scanned.

In detail, the Tx driving circuit 32 may control the 3N + 1 th Tx lines T1, T4, T7..., Tj-2 during the first group scanning period as shown in FIG. 16A under the control of the touch controller 30. Drive pulses are supplied sequentially. The Rx driving circuit 34 samples the voltages of the sensor nodes TSN received through all of the Rx lines R1 to Ri during the first group scanning period, and converts the voltages into digital data. The touch controller 30 calculates coordinates of the touch (or proximity) input by analyzing data with touch input from the Rx driver circuit 34 during the first group scanning period. During this period, the touch controller 30 sets up the Tx channels connected to the 3N + 1 th Tx lines (T1, T4, T7 ..., Tj-2) as the active Tx channel using the setup pulse. Deactivate the Tx channels connected to the rest of the Tx lines. The touch controller 30 sets Rx channels connected to all Rx lines R1 to Ri as an active Rx channel using a setup pulse during the first group scanning period.

As a result of the first group scanning, the first and second touch inputs 25 and 26 may be detected as illustrated in FIG. 16A. In this case, the Tx driving circuit 32 sequentially drives only the Tx lines T6 to T8 and T12 to T14 passing through the first and second touch input regions and the peripheral region during the first partial scanning period as shown in FIG. 16B. The pulse is supplied to precisely scan the touch input area and the surrounding area detected as a result of the first group scanning. The Rx driving circuit 34 samples the voltages of the sensor nodes TSN received through all of the Rx lines R1 to Ri during the first partial scanning period, and converts the voltages into digital data, or as shown in FIG. 16B. And only the voltages of the sensor nodes TSN received through the Rx lines R2 to R4 and R10 to R12 passing through the second touch input area and the peripheral area thereof and may be converted into digital data. The touch controller 30 analyzes touch raw data input from the Rx driving circuit 34 during the first partial scanning period, calculates coordinates of the touch (or proximity) input, and outputs the result as final touch coordinate data. During this time, the touch controller 30 activates only the Tx channels connected to the even-numbered Tx lines passing through the touch input area and its surrounding area using the setup pulse, while deactivating the Tx channels connected to the remaining Tx lines. . The touch controller 30 sets Rx channels connected to all Rx lines R1 to Ri as an active Rx channel using a setup pulse during the first partial scanning period, or Rx lines passing through the touch input area and its peripheral area. Enable only Rx channels connected to.

The Tx driving circuit 32 applies driving pulses to the 3N + 2th Tx lines T2, T5, T8, and Tj-1 during the second group scanning period as shown in FIG. 16C under the control of the touch controller 30. FIG. Supply sequentially. The Rx driving circuit 34 samples the voltages of the sensor nodes TSN received through all of the Rx lines R1 to Ri during the second group scanning period, and converts the voltages into digital data. The touch controller 30 calculates coordinates of the touch (or proximity) input by analyzing data with touch input from the Rx driver circuit 34 during the second group scanning period. During this period, the touch controller 30 sets up the Tx channels connected to the 3N + 2 th Tx lines (T2, T5, T8 ..., Tj-1) as the active Tx channel using the setup pulse. Deactivate the Tx channels connected to the rest of the Tx lines. The touch controller 30 sets Rx channels connected to all Rx lines R1 to Ri as an active Rx channel using a setup pulse during the second group scanning period.

As a result of the second group scanning, the first and second touch inputs 25 and 26 may be detected as illustrated in FIG. 16C. In this case, the Tx driving circuit 32 sequentially drives only the Tx lines T4 to T6 and T10 to T12 passing through the first and second touch input regions and the peripheral region during the second partial scanning period as shown in FIG. 16D. The pulse is supplied to precisely scan the touch input area and the surrounding area detected as a result of the second group scanning. The Rx driving circuit 34 samples the voltages of the sensor nodes TSN received through all of the Rx lines R1 to Ri during the second partial scanning period, and converts the voltages into digital data, or as shown in FIG. 16D. And only the voltages of the sensor nodes TSN received through the Rx lines R2 to R4 and R10 to R12 passing through the second touch input area and the peripheral area thereof and may be converted into digital data. The touch controller 30 analyzes touch raw data input from the Rx driving circuit 34 during the second partial scanning period, calculates coordinates of the touch (or proximity) input, and outputs the result as final touch coordinate data. During this time, the touch controller 30 activates only the Tx channels connected to the even-numbered Tx lines passing through the touch input area and its surrounding area using the setup pulse, while deactivating the Tx channels connected to the remaining Tx lines. . The touch controller 30 sets Rx channels connected to all of the Rx lines R1 to Ri as an active Rx channel by using a setup pulse during the second partial scanning period, or Rx lines passing through the touch input area and its peripheral area. Enable only Rx channels connected to.

The Tx driving circuit 32 sequentially drives driving pulses on the 3N + 3 th Tx lines T3, T6, T9... Tj during the third group scanning period as shown in FIG. 16E under the control of the touch controller 30. Supply. The Rx driving circuit 34 samples the voltages of the sensor nodes TSN received through all of the Rx lines R1 to Ri during the third group scanning period, and converts the voltages into digital data. The touch controller 30 calculates coordinates of the touch (or proximity) input by analyzing data with touch input from the Rx driver circuit 34 during the third group scanning period. During this period, the touch controller 30 sets up the Tx channels connected to the 3N + 3 th Tx lines (T3, T6, T9 ..., Tj) as active Tx channels using the setup pulse, while the rest Deactivate the Tx channels connected to the Tx lines. The touch controller 30 sets Rx channels connected to all Rx lines R1 to Ri as an active Rx channel using a setup pulse during the third group scanning period.

As a result of the third group scanning, the first and second touch inputs 25 and 26 may be detected as shown in FIG. 16E. In this case, the Tx driving circuit 32 sequentially drives only the Tx lines T5 to T7 and T11 to T13 passing through the first and second touch input regions and the peripheral region during the third partial scanning period as shown in FIG. 16F. The pulse is supplied to precisely scan the touch input area and its surrounding area detected as a result of the third group scanning. During the third partial scanning period, the Rx driving circuit 34 samples the voltages of the sensor nodes TSN received through all of the Rx lines R1 to Ri and converts the voltages into digital data, or as shown in FIG. 16F. And only the voltages of the sensor nodes TSN received through the Rx lines R2 to R4 and R10 to R12 passing through the second touch input area and the peripheral area thereof and may be converted into digital data. The touch controller 30 analyzes touch raw data input from the Rx driver circuit 34 during the third partial scanning period, calculates coordinates of the touch (or proximity) input, and outputs the result as final touch coordinate data. During this time, the touch controller 30 activates only the Tx channels connected to the even-numbered Tx lines passing through the touch input area and its surrounding area using the setup pulse, while deactivating the Tx channels connected to the remaining Tx lines. . The touch controller 30 sets Rx channels connected to all of the Rx lines R1 to Ri as an active Rx channel by using a setup pulse during the second partial scanning period, or Rx lines passing through the touch input area and its peripheral area. Enable only Rx channels connected to.

As the number of lines of the touch screen TSP increases and the intervals between the lines become narrower, the intervals between the lines scanned during the group scanning period may be further increased. For example, in another embodiment of the present invention, the Tx driving circuit 32 and the Rx driving circuit 34 sequentially scan 4N + 1th lines of the touch screen TSP during the first group scanning period, When a touch (or proximity) input is detected as a result of the first group scanning, the lines passing through the touch input region and the peripheral region detected during the first partial scanning period may be precisely scanned. Subsequently, the Tx driving circuit 32 and the Rx driving circuit 34 sequentially scan the 4N + 2th lines of the touch screen TSP during the second group scanning period, and input the second group scanning result touch (or proximity). If detected, the lines passing through the touch input area and the peripheral area detected during the second partial scanning period can be precisely scanned. Subsequently, the Tx driving circuit 32 and the Rx driving circuit 34 sequentially scan the 4N + 3th lines of the touch screen TSP during the third group scanning period, and input the third group scanning result touch (or proximity). If detected, the lines passing through the touch input area and the peripheral area detected during the third partial scanning period can be precisely scanned. Subsequently, the Tx driving circuit 32 and the Rx driving circuit 34 sequentially scan the 4N + 4th lines of the touch screen TSP during the fourth group scanning period, and input the fourth group scanning result touch (or proximity). If detected, the lines passing through the touch input region and the peripheral region detected during the fourth partial scanning period can be precisely scanned.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

DIS: Display panel TSP: Touch screen
12: data driving circuit 14: scan driving circuit
20: timing controller 30: touch controller
32: Tx driving circuit 34: Rx driving circuit

Claims (8)

  1. And a touch recognizable area including Tx lines, Rx lines intersecting the Tx lines, and sensor nodes formed at intersections of the Tx lines and the Rx lines, wherein the touch recognizable area includes at least two A touch screen divided into blocks;
    The driving pulses are sequentially supplied to some of the Tx lines during the group scanning period, and when the touch scan is detected as a result of the group scanning, the driving pulse is shifted to the partial scanning period so that only some Tx lines passing through the touch input region and its peripheral region are provided. A touch screen driving circuit which sequentially supplies the driving pulses to precisely scan the touch input area and its surrounding area; And
    And a touch controller for controlling driving of the touch screen driving circuit and calculating coordinates of the touch input area by analyzing data with touch input from the touch screen driving circuit.
  2. The method of claim 1,
    The touch screen driving circuit includes:
    Driving pulses are sequentially supplied to the odd-numbered Tx lines during the first group scanning period,
    When a touch input is detected as a scanning result of the first group scanning period, the driving pulse is sequentially supplied only to even-numbered Tx lines passing through the touch input region and the peripheral region during the first partial scanning period and the touch input region. Precisely scan the surrounding area,
    Driving pulses are sequentially supplied to even-numbered Tx lines during the second group scanning period,
    When the touch input of the scanning result of the second group scanning period is detected, the driving pulse is sequentially supplied only to the odd-numbered Tx lines passing through the touch input area and the peripheral area during the second partial scanning period and the touch input area. Touch screen driving device, characterized in that the precise scanning of the peripheral area.
  3. The method of claim 2,
    The touch screen driving circuit includes:
    During the first and second group scanning period, the voltages of the sensor nodes received through all Rx lines are sampled, converted into digital data, and transmitted to the touch controller.
    The touch screen driving apparatus of claim 1, wherein the voltages of the sensor nodes received through all the Rx lines are sampled, converted into digital data, and transmitted to the touch controller during the first and second partial scanning periods.
  4. The method of claim 2,
    The touch screen driving circuit includes:
    During the first and second group scanning period, the voltages of the sensor nodes received through all Rx lines are sampled, converted into digital data, and transmitted to the touch controller.
    During the first and second partial scanning periods, a touch screen for sampling the voltages of the sensor nodes received through the Rx lines passing through the touch input region and the peripheral region, converting the voltages into digital data, and transmitting the converted data to the touch controller. drive.
  5. The method of claim 1,
    The touch screen driving circuit includes:
    During the first group scanning period, 3N (N is a positive integer) + driving pulses are sequentially supplied to the first Tx lines,
    When a touch input is detected as a scanning result of the first group scanning period, the driving pulse is sequentially supplied only to the Tx lines passing through the touch input area and the peripheral area during the first partial scanning period, thereby providing the touch input area and the surrounding area. Precisely scan areas,
    Driving pulses are sequentially supplied to 3N + 2 th Tx lines during the second group scanning period,
    When a touch input is detected as a scanning result of the second group scanning period, the driving pulse is sequentially supplied only to the Tx lines passing through the touch input area and the peripheral area during the second partial scanning period, so that the touch input area and its surroundings are sequentially supplied. Precisely scan areas,
    Driving pulses are sequentially supplied to 3N + 3 th Tx lines during the third group scanning period,
    When a touch input is detected as a result of scanning in the third group scanning period, the driving pulse is sequentially supplied to only the Tx lines passing through the touch input area and the peripheral area during the third partial scanning period, so that the touch input area and its surroundings are sequentially supplied. Touch screen drive device, characterized in that for precisely scanning the area.
  6. The method of claim 5, wherein
    The touch screen driving circuit includes:
    Sampling the voltages of the sensor nodes received through all Rx lines during the first second and third group scanning periods, converting the voltages of the sensor nodes into digital data, and transmitting them to the touch controller,
    The touch screen driving apparatus of claim 1, wherein the voltages of the sensor nodes received through all the Rx lines are sampled, converted into digital data, and transmitted to the touch controller during the first, second and third partial scanning periods.
  7. The method of claim 5, wherein
    The touch screen driving circuit includes:
    During the first, second and third group scanning period, the voltages of the sensor nodes received through all Rx lines are sampled, converted into digital data, and transmitted to the touch controller.
    During the first, second and third partial scanning period, the voltage of the sensor nodes received through the Rx lines passing through the touch input area and the peripheral area is sampled, converted into digital data, and transmitted to the touch controller. Touch screen driving device.
  8. And a touch recognizable area including Tx lines, Rx lines intersecting the Tx lines, and sensor nodes formed at intersections of the Tx lines and the Rx lines, wherein the touch recognizable area includes at least two A method of driving a touch screen divided into blocks,
    Sequentially supplying driving pulses to some of the Tx lines during a group scanning period;
    When a touch input is detected as a result of scanning in the group scanning period, the process shifts to a partial scanning period and sequentially supplies the driving pulse to only some Tx lines passing through the touch input region and the peripheral region, thereby providing the touch input region and the peripheral region. Precise scanning; And
    And calculating coordinates of the touch input area.
KR1020110091854A 2011-09-09 2011-09-09 Apparatus and method for driving touch screen KR20130028360A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150067567A (en) * 2013-12-10 2015-06-18 엘지디스플레이 주식회사 Display Device Having Partial Panels and Driving Method therefor
US9921684B2 (en) 2011-06-22 2018-03-20 Apple Inc. Intelligent stylus
US9939935B2 (en) 2013-07-31 2018-04-10 Apple Inc. Scan engine for touch controller architecture
US10048775B2 (en) 2013-03-14 2018-08-14 Apple Inc. Stylus detection and demodulation
US10061450B2 (en) 2014-12-04 2018-08-28 Apple Inc. Coarse scan and targeted active mode scan for touch

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9921684B2 (en) 2011-06-22 2018-03-20 Apple Inc. Intelligent stylus
US10048775B2 (en) 2013-03-14 2018-08-14 Apple Inc. Stylus detection and demodulation
US9939935B2 (en) 2013-07-31 2018-04-10 Apple Inc. Scan engine for touch controller architecture
US10067580B2 (en) 2013-07-31 2018-09-04 Apple Inc. Active stylus for use with touch controller architecture
KR20150067567A (en) * 2013-12-10 2015-06-18 엘지디스플레이 주식회사 Display Device Having Partial Panels and Driving Method therefor
US10061450B2 (en) 2014-12-04 2018-08-28 Apple Inc. Coarse scan and targeted active mode scan for touch
US10061449B2 (en) 2014-12-04 2018-08-28 Apple Inc. Coarse scan and targeted active mode scan for touch and stylus
US10067618B2 (en) 2014-12-04 2018-09-04 Apple Inc. Coarse scan and targeted active mode scan for touch

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