KR102114329B1 - Touch sensing system and data compensation method thereof - Google Patents

Abstract

The present invention relates to a touch sensing system and a method for compensating the data, the touch sensing system comprising: a first integrated circuit that receives touch sensor signals through a first output terminal of a touch screen and converts them into a first group of digital data; A second integrated circuit for receiving touch sensor signals through a second output terminal of the touch screen and converting them into a second group of digital data; And receiving the first and second groups of digital data, adding first dummy data to the first group of digital data, adding second dummy data to the second group of digital data, and adding the first dummy data to the first group. And a data compensating unit that sequentially calculates the first digital data of the first group and the last digital data of the second group to generate more compensation data than the number of received digital data.

Description

Touch sensing system and its data compensation method {TOUCH SENSING SYSTEM AND DATA COMPENSATION METHOD THEREOF}

The present invention relates to a touch sensing system that divides and drives a touch screen using a multi-chip and a data compensation method.

A user interface (UI) allows a person (user) to easily control various electronic devices as desired. Typical examples of such a user interface include a keypad, a keyboard, a mouse, an on-screen display (OSD), a remote controller with infrared communication or radio frequency (RF) communication. User interface technology is evolving in the direction of increasing user sensitivity and ease of operation. Recently, the user interface has evolved into a touch UI, a voice recognition UI, and a 3D UI.

The touch UI is essentially adopted for portable information devices. The touch UI is implemented as a method of forming a touch screen on a screen of a display device.

The mutual capacitive touch screen includes Tx lines, Rx lines orthogonal to the Tx lines, and touch sensors formed between the Tx lines and the Rx lines. The sensing circuit supplies a driving signal to the Tx line, and at the same time senses a voltage change of the touch sensor through the Rx line. The sensing circuit detects a change in the voltage of the touch sensor before and after the touch to determine whether or not the conductive material touches the touch screen and its position. The sensing circuit is implemented as a single integrated circuit (IC) chip and is connected to the Tx and Rx lines of the touch screen.

As the size and resolution of the touch screen increases, the number of Tx channels and the number of Rx channels of the touch screen also increases. Therefore, when the size and resolution of the touch screen increase, it is necessary to connect two or more ICs to the touch screen.

In the US patent US 8,350,824 B2, in the example in which two ICs (IC # 1, IC # 2) are connected to a large touch screen (TSP) as shown in FIG. 1, sensor data at the boundary between ICs (hereinafter referred to as "boundary data") How to obtain). The sensing method disclosed in US Pat. No. 8,350,824 B2 determines one sensing data by using Analog to Digital Conversion (ADC) values of neighboring TRX channels. Each of the first and second ICs IC # 1 and IC # 2 is connected to 10 TRX channels. For example, the first IC (IC # 1) determines first touch raw data (TRX1) using ADC values of the first and second TRX channels, and the ninth and tenth TRX channels. The data (TRX9) of the ninth touch is determined using the ADC values of. However, the 11th TRX channel adjacent to the 10th TRX channel is not connected to the first IC (IC # 1). For this reason, the first IC (IC # 1) cannot obtain data (boundary data) of the tenth touch in the same way as other TRX channels.

In order to obtain boundary data, U.S. Patent No. 8,350,824 B2 performs low pass filtering of boundary data and neighboring TRX data in the first IC (IC # 1) and the second IC (# 2) and averages the result. A method of generating boundary data with one value was proposed. However, in this sensing method, since the surrounding data of the boundary data must be compared and the average is calculated in order to obtain the boundary data, the data processing time is increased due to the large amount of data computation, and the output deviation between ICs (IC # 1, IC # 2) If is large, the accuracy of data may be deteriorated.

The present invention provides a touch sensing system capable of accurately generating boundary data between ICs when a plurality of IC chips are connected to a single touch screen using a simple algorithm and a data compensation method.

The touch sensing system of the present invention includes a touch screen including a plurality of touch sensors; A first integrated circuit for receiving touch sensor signals through a first output terminal of the touch screen and converting them into a first group of digital data; A second integrated circuit for receiving touch sensor signals through a second output terminal of the touch screen and converting them into a second group of digital data; And receiving the first and second groups of digital data, adding first dummy data to the first group of digital data, adding second dummy data to the second group of digital data, and adding the first dummy data to the first group. And a data compensating unit that sequentially calculates the first digital data of the first group and the last digital data of the second group to generate more compensation data than the number of received digital data.

The data compensation method of the touch sensing system includes receiving the first and second groups of digital data; Adding first dummy data to the first group of digital data and adding second dummy data to the second group of digital data; And generating compensation data greater than the number of received digital data by sequentially integrating from the first digital data of the first group to the last digital data of the second group.

In the present invention, when a plurality of IC chips are connected to one touch screen, integral data is performed on data obtained from the ICs to generate boundary data between ICs. As a result, the present invention can accurately generate boundary data between ICs with a simple algorithm.

1 is a view showing a conventional touch sensing method using a multi-chip.
2 is a block diagram showing a touch sensing system according to an embodiment of the present invention.
3 is an enlarged plan view of a portion of the touch screen shown in FIG. 1.
4 to 6 are views showing various combinations of a touch screen and a display panel.
7 is a view showing an example of connecting multiple chips to a touch screen having 96 Rx lines.
8 is a flowchart showing a data compensation method of the present invention.
9 and 10 are diagrams showing an integration operation direction in the data compensation method of the present invention.
11 is a diagram showing an example of integral calculation and offset compensation.

The display device of the present invention includes 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 elements (Electrophoresis, EPD). In the following embodiments, as an example of a flat panel display element, a display device is mainly described as a liquid crystal display element, but the display device of the present invention is not limited to a liquid crystal display element.

The touch sensing system of the present invention may be implemented as a capacitive touch screen that senses a touch input through a plurality of capacitive sensors. The capacitive touch screen includes a plurality of touch sensors. Each of the touch sensors includes capacitance when viewed as an equivalent circuit. The electrostatic capacity may be divided into self capacitance or mutual capacitance. The self-capacitance is formed along a single-layer conductor wiring formed in one direction. Mutual capacitance is formed between two orthogonal conductor wires. In the following embodiments, the mutual capacitive touch screen is illustrated, but it should be noted that the touch sensing system of the present invention is not limited to the mutual capacitive touch screen.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Throughout the specification, the same reference numerals refer to substantially the same components. In the following description, when it is determined that a detailed description of a known function or configuration related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description is omitted.

2 to 6, the touch sensing system of the present invention includes a touch screen (TSP) and a touch screen driving circuit. The touch screen TSP is bonded on the upper polarizing plate POL1 of the display panel DIS as shown in FIG. 4 or formed between the upper polarizing plate POL1 and the upper substrate GLS1 of the display panel DIS as shown in FIG. 5. Can be. Further, the touch sensors Cts of the touch screen TSP may be embedded in the lower substrate in an in-cell type with a pixel array in the display panel DIS as shown in FIG. 6. 4 to 6, “PIX” refers to a pixel electrode of a liquid crystal cell, “GLS2” refers to a lower substrate, and “POL2” refers to a lower polarizing plate, respectively.

The display panel DIS includes a liquid crystal layer formed between two substrates. The pixel array of the display panel DIS includes pixels formed in the pixel area defined by the data lines D1 to Dm, m being a positive integer and gate lines G1 to Gn and n being a positive integer. . Each of the pixels is connected to the TFTs (Thin Film Transistor) formed at the intersections of the data lines D1 to Dm and the gate lines G1 to Gn, a pixel electrode charging a data voltage, and a pixel electrode connected to the pixel electrode. And storage capacitors (Cst) for maintaining voltage.

A black matrix, a color filter, and the like are formed on the upper substrate of the display panel DIS. The lower substrate of the display panel DIS may be implemented in a color filter on TFT (COT) structure. In this case, the black matrix and the color filter may be formed on the lower substrate of the display panel DIS. The common electrode to which the common voltage is supplied may be formed on the upper substrate or the lower substrate of the display panel DIS. A polarizing plate is attached to each of the upper and lower substrates of the display panel DIS, and an alignment layer for setting a pretilt angle of the liquid crystal is formed on an inner surface contacting the liquid crystal. 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 under the rear surface of the display panel DIS. The backlight unit is implemented as an edge type or a direct type backlight unit and irradiates light to the display panel DIS. The display panel DIS may be implemented in any known liquid crystal mode such as a twisted nematic (TN) mode, a vertical alignment (VA) mode, an in-plane switching (IPS) mode, and a fringe field switching (FFS) mode.

The display driving circuit includes a data driving circuit 12, a scan driving circuit 14, and a timing controller 20 to write video data of an input image to pixels of the display panel DIS. The data driving circuit 12 converts digital video data RGB input from the timing controller 20 into an analog positive / negative gamma compensation voltage and outputs the data voltage. The data voltage output from the data driving circuit 12 is supplied to the data lines D1 to Dm. The scan driving circuit 14 sequentially supplies gate pulses (or scan pulses) 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 inputs timing signals such as a vertical synchronization signal (Vsync), a horizontal synchronization signal (Hsync), a data enable signal (Data Enable, DE), and a main clock (MCLK) input from the host system 50. The operation timings of the data driving circuit 12 and the scan driving circuit 14 are synchronized. 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, POL), and a source output enable (SOE) signal.

The host system 50 may be implemented as any one of a television system, a set top box, a navigation system, a DVD player, a Blu-ray player, a personal computer (PC), a home theater system, and a phone system. The host system 50 converts digital video data (RGB) of the input image into a format suitable for display on the display panel DIS, including a system on chip (SoC) having a scaler. The host system 50 transmits timing signals Vsync, Hsync, DE, and MCLK together with digital video data to the timing controller 20. Further, the host system 50 executes an application program associated with coordinate information (XY) of touch data input from the touch screen driving circuit.

The touch screen TSP includes Tx lines (Fig. 3, Tx1 to Tx5), Rx lines intersecting with Tx lines (Tx1 to Tx5) (Fig. 3, Rx1 to Rx96), and Tx lines (Tx1 to Tx5). And touch sensors Cts formed at intersections of the Rx lines Rx1 to Rx96. Each of the touch sensors Cts includes a mutual capacitance. The Tx lines are Tx lines of the first Tx group (or the first driving signal input terminal) connected to the first IC 31 and the second Tx group (or the second driving signal input terminal) connected to the second IC 32. It can be divided into Tx lines. The Rx lines are Rx lines of the first Rx group (or first output terminal) connected to the first IC 32 and Rx lines of the second Rx group (or second output terminal) connected to the second IC 32. Can be divided.

Differential amplifiers 30 may be connected between the Rx lines and the ICs 31 and 32 as shown in FIG. 3. The differential amplifiers 30 amplify the difference between the touch sensor signals inputted through neighboring Rx lines and output the difference voltage. For example, the first differential amplifier outputs a _first difference voltage C ₁ between signals input through the first Rx line Rx1 and the second Rx line Rx2. The second differential amplifier outputs a second voltage difference between signals input through the second Rx line Rx2 and the third Rx line Rx3. The differential amplifiers 30 improve the signal-to-noise ratio (SNR) by reducing the noise component introduced due to the parasitic capacitance of the touch screen TSP by amplifying the difference between signals input through neighboring Rx lines. The differential amplifier 30 amplifies the difference between voltages obtained from neighboring touch sensors along the Tx line direction (or x-axis direction) through the positive output terminal and the negative output terminal, and compensates for the complementary positive signal. It may be implemented with a fully differential amplifier that outputs a negative polarity signal voltage. In FIG. 3, C1 to C5 are integration operation results for touch furnace data, which will be described later.

The touch screen driving circuit includes a sensing circuit, a data compensation unit, and an algorithm execution unit. The sensing circuit includes two or more ICs 31 and 32 that divide and drive the touch screen TSP. In the following embodiment, the sensing circuit is illustrated with two ICs 31 and 32, but as the size of the touch screen TSP increases, the IC may be required more. The data compensation unit and the algorithm execution unit may be implemented by a microcontroller unit (MCU) 40.

The ICs 31 and 32 may receive a vertical sync signal Hsync and a horizontal sync signal Hsync to generate a sync signal SYNC. The ICs 31 and 32 operate in synchronization with sending and receiving a synchronization signal SYNC. The first IC 31 applies a driving signal to Tx lines of the first Tx group. The second IC 32 applies a driving signal to Tx lines of the second Tx group. The driving signal is generated as a waveform such as a pulse or a sinusoidal wave to supply electric charges to the touch sensors Cts. The ICs 31 and 32 sense the amount of charge change before and after the touch in the touch sensor signal received through the Rx lines and the differential amplifiers 30 and convert the amount of charge change into digital data. To this end, each of the ICs 31 and 32 includes an analog to digital converter (hereinafter referred to as "ADC"). The digital data is supplied to the MCU 40 as touch raw data. The first IC 31 converts the touch sensor signal received through the Rx lines of the first Rx group (FIG. 7, Rx1 to Rx48) into digital data in synchronization with the driving signal applied to the Tx lines of the first Tx group. After conversion, the touch sensor signal received through the Rx lines Rx1 to Rx48 of the first Rx group is converted to digital data in synchronization with the driving signal applied to the Tx lines of the second Tx group. The second IC 32 converts the touch sensor signal received through the Rx lines of the second Rx group (FIG. 7, Rx49 to Rx96) into digital data in synchronization with the driving signal applied to the Tx lines of the first Tx group. After conversion, the touch sensor signal received through the Rx lines Rx49 to Rx96 of the second Rx group is converted to digital data in synchronization with the driving signal applied to the Tx lines of the second Tx group. Accordingly, the first and second ICs 31 and 32 divide and drive the large touch screen TSP. The touch screen using a multi-chip and its driving method are described in Korean Patent Application 10-2012-0042655 (2012. 04. 24), Korean Patent Application 10-2012-0136130 (2012. 11. 28.) filed by the applicant. The proposed device and method can be used.

The MCU 40 simultaneously receives data through a single line touch on the touch screen through a parallel interface. And the MCU 40 compensates for the touch furnace data using the data compensation method as shown in FIGS. 8 to 13 using the data compensation unit to generate the touch furnace data as many as the number of Rx lines (or Rx channels) of the touch screen and the boundaries between ICs. Generate data.

The data compensator receives the first group of digital data obtained from the first output terminal of the touch screen TSP through the first IC 31, and receives the first group of digital data from the second output terminal of the touch screen TSP through the second IC 32. The obtained second group of digital data is received. The data compensation unit adds first dummy data to the first group of digital data and second dummy data to the second group of digital data. Subsequently, the data compensation unit sequentially calculates from the first digital data of the first group to the last digital data of the second group to generate more compensation data than the number of received digital data. When the integral operation is performed, the output deviation between the ICs 31 and 32 is compensated. The compensation data includes boundary data between ICs 31 and 32.

The data compensator integrally calculates the first dummy data on the first digital data among the first group of digital data, sequentially calculates the last digital data of the first group, and finally integrates the results of the first group of integral calculation results. The calculation result and the second dummy data are integrally calculated, and the final digital data of the second group are sequentially integrated. Subsequently, the data compensator offset-compensates by adding the minimum value of all the integral calculation results calculated for the first and second groups of digital data to each of the integration calculation results.

The MCU 40 compares each of the final compensation data output from the data compensation unit with a predetermined threshold value, and determines that the data above the threshold value is data obtained from touch sensors in which a touch input is generated. The MCU 40 assigns an identification code to each of the touch input data above a threshold value and calculates coordinates of each of the touch input positions. The MCU 40 transmits identification code and coordinate information (XY) of each touch data above a threshold value to the host system 50.

7 is a diagram illustrating an example in which multi-chips 31 and 32 are connected to a touch screen TSP having 96 Rx lines Rx1 to Rx96. In FIG. 7, the connection between the ICs 31 and 32 and the Tx lines is omitted.

Referring to FIG. 7, the first IC 31 is connected to Tx lines of the first Tx group and Rx lines Rx1 to Rx48 of the first Rx group through differential amplifiers 30. The second IC 32 is connected to Tx lines of the second Tx group and Rx lines Rx1 to Rx48 of the second Rx group through the differential amplifiers 30. The differential amplifier 30 amplifies the difference signal between signals input through two neighboring Rx lines. Therefore, each of the ICs 31 and 32 is connected to 48 Rx lines, but receives 47 signals through the differential amplifiers 30 and outputs data with 47 touches.

8 is a flowchart illustrating a method for compensating data by touch of the present invention.

Referring to FIG. 8, the data compensation method of the present invention simultaneously receives 94 touch-ro data from ICs 31 and 32. (S1) Subsequently, the data compensation method of the present invention includes dummy data for each IC (FIG. 9). -10, C ₀ ) is added to the touch furnace data, and 96 compensated touch furnace data including boundary data is generated through integrating with direction as shown in FIGS. 9 to 13 (S2 and S3) 96 The data of the compensated touch dogs is compared to the threshold. The dummy data C ₀ is not touch raw data obtained from the touch screen TSP, but is specific data stored in a register in the MCU 40 in advance, for example, data set to '0' as shown in FIG. 11. The first dummy data C ₀ is set to '0' to be integrated with the first touch furnace data obtained from the first IC 31. The i-th (i is a positive integer greater than or equal to 2) dummy data is set to '0', and the value is compensated by integrating with the last integration result of the i-1 IC (IC # i-1).

9 and 10 are diagrams giving an integration operation direction of a data compensation method according to an embodiment of the present invention. 11 is a diagram showing an example of integral calculation and offset compensation.

9 to 11, when one line of the touch screen (TSP) includes 96 touch sensors, the outputs of the touch sensors are differential amplifier 30 and the first and second ICs ( 31, 32) to 94 touch data (C ₁ ~ C ₉₄ ). In the data compensation method of the present invention, dummy data C ₀ are added to the touch row data C ₁ to C ₉₄ received from the ICs 31 and 32, respectively. The first dummy data C ₀ is added to the touch row data received from the first IC 31. The second dummy data C ₀ is added to the touch row data received from the second IC 32.

The data compensation method of the present invention the first dummy data (C ₀₎ of the offset compensation and producing data (D ₁₎ to the compensated first touch, dummy data (C ₀₎ and with the data received touch (C ₁ ~ C ₉₄ ) is performed along a specific direction, and offset compensation is performed on the integration result to generate compensated second to 96th touch data (D ₂ to D ₉₆ ). Hereinafter, "compensated touch data" is abbreviated as "compensated data".

In the integral calculation method, the integral operation is sequentially performed from the first touch furnace data C ₁ to the last touch furnace data C ₉₄ . If the i (i is a positive integer greater than or equal to 2) compensation data is C _i , C _i may be expressed as follows.

Ci = C _{i -1} + ΔC _{i -1i} or Ci = C _{i -1} -ΔC _{i -1i}

Here, ΔC _{i -1i} is a difference value (Differential Sensing Data) between the i-1 compensation data and the i compensation data.

In FIG. 11, the second row of (A) is the touch row data received by the MCU 40 through the differential amplifier 30 and the first IC 31, and the third row is Ci = C _{i -1} -ΔC _i Integral calculation result calculated with _-1i , that is, compensation data. In (A) of FIG. 11, the fourth row is a result of offset correction, and is the final compensation data (D ₁ to D ₁₃ ) compensated with a positive value by adding a minimum value = 1347 to each of the compensation data in the integration result of the third row.

In FIG. 12, the second row of (B) is the touch row data received by the MCU 40 through the differential amplifier 30 and the first IC 31, and the third row is Ci = C _{i -1} + ΔC _i Integral calculation result calculated with _-1i , that is, compensation data. In (B) of FIG. 12, the fourth row is a result of offset correction, and is the final compensation data (D ₁ to D ₁₃ ) compensated as a positive value by adding a minimum value = 49 to each of the compensation data in the integration result of the third row. .

When the second to fifth compensation data is C ₂ , C ₃ , C ₄ , and C ₅ , it can be expressed as follows.

C ₂ = C ₁ + ΔC ₁₂

C ₃ = C ₂ + ΔC ₂₃

C ₄ = C ₃ + ΔC ₃₄

C ₅ = C ₄ + ΔC ₄₅

The boundary data between the ICs 31 and 32 is the 47th compensation data C ₄₇ in FIGS. 9 and 10. The 47th compensation data (C ₄₇ ) is C ₄₇ = C ₄₆ + ΔC ₄₆₄₇ .

The second dummy data C ₀ is set to '0' and is integrally calculated with the 47th compensation data C ₄₇ which is the result of the last integration operation of the first IC IC1. The second dummy data C ₀ is C ₀ = C ₄₇ + ΔC ₄₇₀ . Where ΔC ₄₇₀ = │C ₄₇₀ -C ₀ │ = │C ₄₇₀ - 0 It is calculated as │.

The 48th compensation data C ₄₈ is generated as a result of the integration operation of the second dummy data C ₀ generated by the integration operation and the first touch furnace data C ₄₈ of the second IC 32. The 48th reward data (C ₄₈ ) is C ₄₈ = C ₀ + ΔC ₀₄₈ .

The 49th compensation data C ₄₉ is generated as a result of the integration operation of the first and second touch furnace data C ₄₈ and C ₄₉ of the second IC 32. The 49th reward data (C ₄₉ ) is C ₄₉ = C ₄₈ + ΔC ₄₈₄₉ .

The 50th compensation data C ₅₀ is generated as a result of the integration operation of the second and third touch furnace data C ₄₉ and C ₅₀ of the second IC 32. The 50th compensation data (C ₅₀ ) is C ₅₀ = C ₉ + ΔC ₄₉₅₀ .

The offset compensation method generates final final compensation data (D ₁ to D ₉₆ ) by adding the minimum values of the integral calculation results obtained by the integral calculation method as shown in FIG. 11 to each of the compensation data.

In the data compensation method of the present invention, data calculation or low-pass filtering is not required to calculate the average of data as in the prior art.

Through the above description, those skilled in the art will appreciate that various changes and modifications are possible without departing from the technical idea 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 determined by the scope of the claims.

DIS: Display panel TSP: Touch screen
12: data driving circuit 14: scan driving circuit
31, 32: IC 40: MCU

Claims (5)

A touch screen including Tx lines, Rx lines intersecting the Tx lines, and a plurality of touch sensors formed between the Tx lines and the Rx lines;
A first integrated circuit for differentially amplifying touch sensor signals through Rx lines of a first output terminal of the touch screen and converting the differentially amplified touch sensor signals into a first group of digital data;
A second integrated circuit for differentially amplifying touch sensor signals through Rx lines of a second output terminal of the touch screen and converting the differentially amplified touch sensor signals into a second group of digital data; And
The first and second groups of digital data of one line of the touch screen are simultaneously received, the first dummy data is added to the head of the first group of digital data, and the second of the digital data of the second group is added. 1 line of digital received by adding dummy data and sequentially integrating from the first digital data of the first group including the first dummy data to the last digital data of the second group including the second dummy data It includes a data compensation unit for generating a larger number of compensation data than the number of data,
The data compensation unit,
Integral operation of the first digital data among the first group of digital data on the first dummy data, and integration of the second digital data of the first group on the integration result of the first digital data of the first group. In order to integrally calculate the last digital data of the first group,
Integral operation of the last integration result and the second dummy data among the integration results of the first group,
The first digital data among the digital data of the second group is integrally calculated with the result of the integral calculation of the second dummy data, and the second digital of the second group is integrated with the result of the integral calculation of the first digital data of the second group. In a manner of integrating data, sequentially integrating up to the last digital data of the second group,
A touch sensing system characterized in that offset compensation is performed by adding a minimum value of each of the integral calculation results calculated for the first and second groups of digital data to each of the integration calculation results. delete According to claim 1,
The first and second dummy data are not obtained from the touch screen, and the touch sensing system is characterized in that the data generated in the data compensation unit '0 (zero)'. Touch screen including Tx lines, Rx lines intersecting the Tx lines, and a plurality of touch sensors formed between the Tx lines and the Rx lines, touch through Rx lines of a first output terminal of the touch screen By receiving the sensor signals to differentially amplify and convert the differentially amplified touch sensor signals into a first group of digital data, touch sensor signals are received through Rx lines of a second output terminal of the touch screen In the data compensation method of the touch sensing system comprising a second integrated circuit for differentially amplifying and converting the differentially amplified touch sensor signals to a second group of digital data,
Simultaneously receiving first and second groups of digital data in one line of the touch screen;
Adding first dummy data to the head of the first group of digital data and adding second dummy data to the head of the second group of digital data;
A number greater than the number of digital data of one line received by sequentially integrating from the first digital data of the first group including the first dummy data to the last digital data of the second group including the second dummy data. Comprising the step of generating the compensation data,
The first digital data of the first group including the first dummy data to the last digital data of the second group including the second dummy data are sequentially integrated and the compensation data is greater than the number of received digital data. The steps that occur,
Integrating the first digital data among the first group of digital data on the first dummy data;
Sequentially integrating up to the last digital data of the first group in a manner of integrating the second digital data of the first group on the result of the integration of the first group of first digital data;
Integrating a result of the last integration operation and the second dummy data among the integration results of the first group;
Integrating the first digital data among the digital data of the second group in the result of integrating the second dummy data;
Sequentially integrating up to the last digital data in the second group by integrating the second digital data in the second group into an integration result of the first digital data in the second group; And
And compensating for offset by adding a minimum value of each of the integral calculation results calculated for the first and second groups of digital data to each of the integration calculation results, thereby compensating for offset. . delete

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