KR101763939B1 - Display device having touch screen panel and noise compensation method of thereof - Google Patents

Abstract

A touch screen panel integrated display device according to the present invention includes: a liquid crystal display panel; A touch screen panel formed on a surface of the liquid crystal display panel; A noise data storage unit for storing predetermined noise data based on a degree of change of the digital video data for one horizontal line; A touch recognition processor connected to the touch screen panel and generating touch data through information input from the touch screen panel; The digital video data of one horizontal line to be currently displayed is received and the noise data is derived based on the degree of change of the digital video data of the received one horizontal line and then the derived noise data is reflected in the touch data And a touch controller for compensating for the touch data.

Description

TECHNICAL FIELD [0001] The present invention relates to a touch screen panel integrated display device and a noise compensation method therefor. BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

The present invention relates to a touch screen panel integrated display and a noise compensation method therefor.

Recently, a touch screen panel has been proposed in which a user directly touches a screen with a hand or a pen to input information. The touch screen panel is simple, has little malfunction, can be input without using a separate input device, and can be operated quickly and easily through the contents displayed on the screen. .

In the touch screen panel, a metal electrode is formed on a top plate or a bottom plate according to a method of detecting a touched portion, and a resistive film type in which a touched position is determined as a voltage gradient according to a resistance a resistive type, a capacitive type in which an equal potential is formed on a conductive film and a touched portion is sensed by detecting a position where capacitance changes of upper and lower plates due to a touch are sensed, And an electro-magnetic type in which an LC value is read and a touched portion is detected. In addition, an optical method, an ultrasonic method, and the like are known.

Among the touch sensing methods, when a touch is made on the upper substrate and a touch pressure is applied to the upper substrate, the transparent conductive film of the lower plate is mechanically brought into contact with the upper substrate. At this time, And detects the touch position. However, since the touch position is indirectly detected by the potential value sensing the potential of the touched X-axis and Y-axis positions, the analog-digital Converter (ADC, Analog Digital Converter) is necessary and it is difficult to detect the touch position when the contact force is small.

The electrostatic capacitance method forms a matrix by crossing the X-axis electrode patterns and the Y-axis electrode patterns. When a touch is made at an arbitrary position on the matrix, coordinates of the X axis and the Y axis on the matrix, The touch position can be detected even when the contact force is small.

FIG. 1 shows a liquid crystal display device to which a conventional capacitive touch screen panel is applied.

1, a liquid crystal display device 50 includes a thin film transistor array substrate 20 and a color filter array substrate 30, a liquid crystal display panel 30 having a liquid crystal layer 40 filled between two substrates 20 and 30, And a touch screen panel 10 formed on one surface of the liquid crystal display panel.

The thin film transistor array substrate 20 includes gate lines and data lines formed to cross each other on the first substrate 21, thin film transistors formed at intersections of the gate lines and the data lines, A TFT array 23 including pixel electrodes connected to the thin film transistors, and an alignment film 25 applied thereon. The gate lines and the data lines are supplied with signals from the driving circuits through respective pad portions, and the thin film transistors supply the pixel voltage signals to the pixel electrodes in response to the scan signals supplied to the gate lines.

The color filter array substrate 30 includes color filters 33 formed on a second substrate 31 in units of liquid crystal cells, a black matrix 35 for separating color filters and reflecting external light, A common electrode 37 for supplying a reference voltage commonly to the common electrodes 37, and an alignment film 39 applied thereon.

In the environment where the liquid crystal display panel and the touch screen panel are operated closely, the performance of the touch screen panel deteriorates due to the noise generated in the liquid crystal display panel.

As a method for eliminating the influence of noise generated in the liquid crystal display panel,

1) a method of not performing touch sensing at the gate-on time of a liquid crystal display panel in which noise is relatively large,

2) a method of measuring the noise of the liquid crystal display panel by attaching an electrode serving as an antenna to the touch screen panel and removing the measured noise from the touch sensing value,

3) a method of making the driving electrode of the touch screen panel wide and disposed close to the liquid crystal display panel and disposing the relatively sensitive sensing electrode away from the liquid crystal display panel so that the noise of the liquid crystal display panel is less affected by the sensing electrode;

4) By inserting a transparent ground layer between the touch screen panel and the liquid crystal display panel, it is possible to reduce the noise of the liquid crystal display panel for both the driving line and the sensing line of the touch screen panel.

However, since 1) the time required for touch sensing is reduced by the gate-on period and the reporting rate is reduced, and 2) the plan only accepts the noise at the point where the antenna is installed, Calibration is not possible. In addition, the method 3) is not applicable to a diamond structure in which a driving electrode and a sensing electrode are formed together as a single layer of ITO (Indium Tin Oxide), which is currently mainly used, and 4) There is a problem that the contrast of the display device is reduced.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a touch screen panel integrated display device and a noise compensation method thereof, which can improve the accuracy of sensing by eliminating the influence of noise generated in a liquid crystal display panel.

According to an aspect of the present invention, there is provided a touch screen panel integrated display device including: a liquid crystal display panel; A touch screen panel formed on a surface of the liquid crystal display panel; A noise data storage unit for storing predetermined noise data according to a magnitude of a data value of one horizontal line of digital video data; A touch recognition processor connected to the touch screen panel and generating touch data through information input from the touch screen panel; The digital video data of one horizontal line to be currently displayed is received and the noise data is derived based on the magnitude of the data value of the digital video data of one horizontal line received, And a touch controller for compensating for the touch data.

The noise data is determined in consideration of the mutual positional relationship between the area where the touch data is obtained and the horizontal line on which the digital video data is displayed.

The touch controller is further based on the display position of the received digital video data for one horizontal line at the time of deriving the noise data.

The touch data in which the noise data is reflected is the touch data obtained at the trigger point of the source output enable signal for displaying the received digital video data for one horizontal line.

The touch screen panel is implemented in a capacitive manner.

According to an embodiment of the present invention, there is provided a noise compensation method of a touch screen panel integrated display device including a liquid crystal display panel and a touch screen panel formed on one side of the liquid crystal display panel, Quantizing noise data by predicting noise to be generated in the liquid crystal display panel according to a size; Generating touch data through information input from the touch screen panel; Receiving digital video data of one horizontal line to be currently displayed and deriving noise data based on the size of the data value of the received digital video data of one horizontal line; And compensating the touch data by reflecting the derived noise data to the touch data.

According to the present invention, since the touch sensing can be performed even when noise is generated in the liquid crystal display panel, it is possible to improve the reporting rate, precisely correct the entire touch screen panel, There is no decrease in contrast.

1 is a view illustrating a liquid crystal display device to which a conventional capacitive touch screen panel is applied.
2 and 3 are views showing a touch screen panel integrated display device according to an embodiment of the present invention.
4 is a view showing a connection relationship between an output terminal of the data driver and the liquid crystal display panel.
5 shows a source output enable signal.
Fig. 6 is a diagram showing positional relationships between a display position and an area where data is touch-sensing; Fig.
7 is a diagram illustrating a noise compensation method of a touch screen panel integrated display device according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 2 to 7. FIG.

FIG. 2 and FIG. 3 show a touch screen panel integrated display device according to an embodiment of the present invention.

2 and 3, a touch screen panel integrated display device according to an embodiment of the present invention includes a liquid crystal display panel 100 having a color filter array CFA and a thin film transistor array (TFTA), a backlight unit BLU A timing controller 101, a data driver 102, a gate driver 103, a host computer 120, a touch screen panel 200, a first conductive pattern driver 210, a second conductive pattern driver 230, A touch controller 250, a touch recognition processor 270, a noise data storage unit 290, and the like.

The liquid crystal display panel 100 includes a color filter array CFA and a thin film transistor array TFTA and includes a liquid crystal layer LC and a spacer for maintaining a cell gap of the liquid crystal layer LC therebetween. (CS) is formed. The color filter array CFA includes a color filter CF and a black matrix BM formed on one surface of the upper substrate GLS1 and a common electrode COM formed thereon. A touch screen panel 200 is formed on the other surface of the upper substrate GLS1. The thin film transistor array TFTA includes data lines 104 and gate lines 105 formed to cross each other on one surface of a lower substrate GLS2, A thin film transistor T to be formed, and pixels defined by the intersection of the gate line 105 and the data line 104. The lower polarizer POL2 is bonded to the other surface of the lower substrate GLS2.

A back light unit (BLU) is disposed under the liquid crystal display panel 100. [ The backlight unit (BLU) includes a plurality of light sources to uniformly irradiate the liquid crystal display panel 100 with light. The backlight unit (BLU) may be implemented as a direct type backlight unit or an edge type backlight unit. The light source of the backlight unit may include at least one of a hot cathode fluorescent lamp (HCFL), a cold cathode fluorescent lamp (CCFL), an external electro fluorescent lamp (EEFL), and a light emitting diode (LED).

The data driver 102 samples and latches digital video data (RGB) under the control of the timing controller 101. The data driver 102 converts the digital video data RGB to positive / negative gamma compensation voltages GMA1 to GMAn to invert the polarity of the data voltage. The positive / negative polarity data voltage output from the data driver 102 is synchronized with the gate pulse output from the gate driver 103. Each of the source drive ICs (Integrated Circuits) of the data driver 102 may be connected to the data lines 104 of the liquid crystal display panel 100 by a COG (Chip On Glass) process or a TAB (Tape Automated Bonding) process . The source drive IC may be integrated in the timing controller 101 and implemented as a one-chip IC together with the timing controller 101.

The gate driver 103 sequentially outputs gate pulses (or scan pulses) in the display mode under the control of the timing controller 101 and shifts the swing voltage of the output to the gate high voltage VGH and the gate low voltage VGL . The gate pulse output from the gate driver 103 is sequentially supplied to the gate lines 105 in synchronization with the data voltage output from the data driver 102. The gate high voltage VGH is higher than the threshold voltage of the thin film transistor T and the gate low voltage VGH is lower than the threshold voltage of the thin film transistor T. The gate drive ICs of the gate driver 103 are connected to the gate lines 105 of the lower substrate GLS2 of the liquid crystal display panel 100 through the TAP process or are connected to the liquid crystal display panel 100 by the GIP May be formed directly on the lower substrate (GLS2) of the substrate (100).

The timing controller 101 uses a timing signal from the host computer 120 to generate a data timing control signal for controlling the operation timing of the data driver 102 and the polarity of the data voltage and an operation timing of the gate driver 103 And generates a gate timing control signal for controlling.

The gate timing control signal includes a gate start pulse (GSP), a gate shift clock (GSC), a gate output enable signal (GOE), and the like. The gate start pulse GSP is applied from the gate driver 103 to the first gate driver IC which outputs the first gate pulse every frame period to control the shift start timing of the gate driver IC. The gate shift clock GSC is a clock signal commonly input to the gate drive ICs of the gate driver 103 to shift the gate start pulse GSP. The gate output enable signal GOE controls the output timing of the gate drive ICs of the gate driver 103. [

The data timing control signal includes a source start pulse (SSP), a source sampling clock (SSC), a polarity control signal (POL), and a source output enable signal (SOE) . The source start pulse SSP is applied to the first source drive IC which samples the data first in the data driver 102 to control the data sampling start timing. The source sampling clock SSC is a clock signal that controls the sampling timing of data in the source drive ICs based on the rising or falling edge. The polarity control signal POL controls the polarity of the data voltage output from the source drive ICs. The source output enable signal SOE controls the output timing of the source drive ICs. the source start pulse SSP and the source sampling clock SSC may be omitted if digital video data RGB is input to the data driver 102 through the mini LVDS interface.

The host computer 120 transmits the digital video data RGB of the input image and the timing signals Vsync, Hsync, DE and MCLK necessary for driving the display to an interface such as an LVDS interface and a TMDS (Transition Minimized Differential Signaling) To the timing controller 101. The host computer 120 receives the touch coordinates from the touch controller 250 and executes an application corresponding to the touch coordinates.

The touch screen panel 200 includes a plurality of first conductive patterns 201 arranged in parallel to each other in a first direction (e.g., an X direction), a second direction (e.g., A plurality of second conductive patterns 203 arranged in parallel with each other in the Y direction) and an insulating layer (not shown) for insulating the first conductive patterns 201 and the second conductive patterns 203 from each other (Or insulating patterns) (not shown).

The first conductive pattern driving unit 210 sequentially supplies the pulse voltage Vtsp generated in the power supply unit to the first conductive patterns 201 of the touch screen panel 200 to sequentially form the first conductive patterns 201 ). The first conductive pattern driving unit 210 floats the conductive patterns other than the first conductive pattern to which the current pulse voltage Vtsp is applied. In the floating state, the current path between the first conductive pattern 201 and the first conductive pattern driver 210 is cut off. Therefore, no external voltage is applied to the conductive pattern in the floating state. The first conductive pattern driving unit 210 includes horizontal line control switches SWH1 to SWH4 for supplying a pulse voltage Vtsp to the first conductive patterns 201 in response to a scanning control signal from the touch controller 250, SWHn. Although it is shown in FIG. 2 that the horizontal line control switches SWH1 to SWHn are formed between the first conductive pattern driver 210 and the touch screen panel 200, those skilled in the art will understand that the horizontal line control switches SWH1 to SWHn may be included in the first conductive pattern driver 210 or the touch screen panel 200. [

The second conductive pattern driving unit 230 sequentially supplies the pulse voltage Vtsp generated by the power supply unit 110 to the second conductive patterns 203 after the scanning operation of the first conductive patterns 201 is completed, 2 < / RTI > The second conductive patterns other than the second conductive pattern filling the pulse voltage Vtsp are all floated. The second conductive pattern driving unit 230 includes vertical line control switches SWV1, SWV2, and SWV3 for supplying a pulse voltage Vtsp to the second conductive patterns 203 in response to a scanning control signal from the touch controller 250, SWV3, ... SWVm-1, SWVm). 2, the vertical line control switches SWV1, SWV2, SWV3, ... SWVm-1, SWVm are shown as being formed between the second conductive pattern driver 230 and the touch screen panel 100 However, those skilled in the art can modify the vertical line control switches SWV1, SWV2, SWV3,... SWVm-1, SWVm to be included in the second conductive pattern driver 230 or the touch screen panel 100.

The touch recognition processor 270 is connected to the first conductive patterns 201 and the second conductive patterns 203 of the touch screen panel to differentially amplify the voltage of the initial capacitance of the conductive pattern and the voltage of the touch capacitance And converts the result into digital data. The touch recognition processor 270 determines the touch position based on the difference between the initial capacitance and the touch capacitance using the touch recognition algorithm and outputs the touch data indicating the touch position to the touch controller 250.

The noise data storage unit 290 is previously determined based on a combination of data for one horizontal line of the liquid crystal display panel 100 or in consideration of a relationship between a region obtained by obtaining the touch data and a horizontal line And stores a plurality of noise data.

The touch controller 250 generates scanning control signals for driving the first conductive pattern driving unit 210 and the second conductive pattern driving unit 230 for driving the touch screen panel 200. The touch controller 250 receives the digital video data RGB along with the source output enable signal SOE from the timing controller 101 for one horizontal line and outputs the digital video data RGB for one horizontal line The noise data corresponding to the noise to be generated when displayed on the liquid crystal display panel 100 is derived from the noise data storage unit 290. The touch controller 250 adds the obtained noise data to the touch data obtained at the trigger point of the source output enable signal SOE for displaying the digital video data RGB for one horizontal line, To compensate the touch data. The touch controller 250 determines the touch coordinates using the compensated touch data when the compensated touch data is collected so as to determine the touch coordinates, and then transmits the touch coordinates to the host computer 120.

4 to 6 are views for explaining the reason why the noise emitted from the liquid crystal display panel 100 in the touch controller 250 is quantified and utilized for correction of the touch data. In Fig. 4, the inverter INV inverts the source output enable signal SOE applied to the output switch SW2.

4 and 5, the data driver 102 receives the digital video data RGB of one horizontal line from the timing controller 101 and converts it into a data voltage Vdata. The data driver 102 outputs the output switches SW2 connected between the output terminal of the buffer and the output channel CH when the source output enable signal SOE is held in the low logic state in one horizontal period 1H. And supplies the data voltage Vdata to the data lines through each output channel CH by turning on the data voltage Vdata. At the time when the source output enable signal SOE is triggered by the low logic for outputting the data voltage Vdata, a large amount of noise is generated, and the magnitude of the noise is applied to each channel CH The voltage is constant.

Each channel CH of the data driver 102 is disconnected from the data lines during the horizontal blanking period in which the source output enable signal SOE is held at the high logic state and is in the Hi-Z state. Further, when the source output enable signal SOE is held at the high logic state, the data lines charged to the opposite polarities are short-circuited to each other by the turn-on of the charge share switches SW1, so that the potential of the common voltage Vcom .

Therefore, the noise generated at the time when the source output enable signal SOE is triggered by the low logic has a characteristic that does not have any relation with the data applied in the previous frame or the data applied to the other horizontal line adjacent to the horizontal line As a result, the noise tendency can be sufficiently determined only by the data of one horizontal line to be displayed at present. In addition, since the position of each horizontal line in the liquid crystal display panel 100 is fixed, the correlation between the position of the horizontal line and the area currently under touch sensing can be easily obtained and the noise tendency can be determined through this correlation .

The positional relationship between the horizontal line in which data is displayed on the liquid crystal display panel 100 and the area under touch sensing can be largely classified into three types as shown in FIG. 6 (A), horizontal touch data does not overlap with a horizontal line for data display, and second, horizontal touch data overlaps with a horizontal line for data display as shown in FIG. 6 (B) Third, as shown in FIG. 6C, vertical touch data partially overlaps a horizontal line for data display. As shown in FIG. 6, the noise tendency can be more accurately determined when the influence of the mutual distance between the horizontal line for data display and the area under touch sensing is reflected.

The noise data may be converted into a database in a lookup table format based on the magnitude of the data value of the digital video data for one horizontal line and the mutual positional relationship between the area in which the touch data is acquired and the horizontal line in which the data is displayed.

7 is a flowchart illustrating a method of compensating noise of a touch screen panel integrated display device according to an exemplary embodiment of the present invention.

Referring to FIG. 7, the noise compensation method of the present invention is a method of compensating the noise of a horizontal line in which digital video data (RGB) The noise data is quantified by predicting the noise to be generated in the liquid crystal display panel based on the mutual positional relationship among the noise data (S10)

The noise compensation method of the present invention receives digital video data RGB of one horizontal line to be displayed at present. (S20) Then, in the noise compensation method of the present invention, digital video data (RGB) The noise data is derived based on the size of the data value and the display position of the noise data (S30)

The noise compensation method of the present invention is a method for compensating for noise derived from touch data acquired at a trigger point of a source output enable signal SOE for displaying digital video data RGB for one horizontal line received And compensates the touch data (S40).

The noise compensation method of the present invention determines whether or not the compensated touch data has been collected to such a degree that the touch coordinates can be determined (S50). If the compensated touch data is collected to such a degree that the touch coordinates can be determined (Yes in S50), the touch coordinates are determined by the collected compensated touch data. (S60) On the other hand, If it is not so collected (No in S50), S20 to S50 are repeated.

As described above, the touch screen panel integrated display device and the noise compensation method according to the present invention can reduce the size of the data value for one horizontal line and / or the mutual positional relationship between the area obtained by the touch data and the horizontal line The noise data is quantified by predicting the noise to be generated in the liquid crystal display panel based on the input image data and the noise data is added to the touch data acquired at the trigger point of the source output enable signal for displaying the digital video data for one horizontal line And compensates the touch data.

According to the present invention, since the touch sensing can be performed even when noise is generated in the liquid crystal display panel, it is possible to improve the reporting rate, precisely correct the entire touch screen panel, There is no decrease in contrast.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the 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.

100: liquid crystal display panel 101: timing controller
102: Data driver 103: Gate driver
120: host computer 200: touch screen panel
210: first conductive pattern driving unit 230: second conductive pattern driving unit
250: Touch controller 270: Touch recognition processor
290: Noise data storage unit

Claims (9)

A liquid crystal display panel;
A touch screen panel formed on a surface of the liquid crystal display panel;
A noise data storage unit for storing predetermined noise data according to a magnitude of a data value of one horizontal line of digital video data;
A touch recognition processor connected to the touch screen panel and generating touch data through information input from the touch screen panel;
The digital video data of one horizontal line to be currently displayed is received and the noise data is derived based on the magnitude of the data value of the digital video data of one horizontal line received, And a touch controller for compensating for the touch data,
The noise data may include:
Wherein the touch screen panel integrated display is determined in consideration of a mutual positional relationship between a region where the touch data is acquired and a horizontal line on which the digital video data is displayed. delete The method according to claim 1,
The touch controller includes:
Wherein the display position of the received digital video data for one horizontal line is further based on the received noisy data. The method according to claim 1,
The touch data, in which the noise data is reflected,
And the touch data obtained at the trigger point of the source output enable signal for displaying the received digital video data of one horizontal line. The method according to claim 1,
Wherein the touch screen panel is implemented in an electrostatic capacity type. A method of compensating noise of a touch screen panel integrated display device including a liquid crystal display panel and a touch screen panel formed on one side of the liquid crystal display panel,
Quantizing noise data by predicting noise to be generated in the liquid crystal display panel according to a magnitude of a data value of digital video data for one horizontal line;
Generating touch data through information input from the touch screen panel;
Receiving digital video data of one horizontal line to be currently displayed and deriving noise data based on the size of the data value of the received digital video data of one horizontal line; And
And compensating the touch data by reflecting the derived noise data to the touch data,
The noise data may include:
Wherein the quantization is performed in consideration of a mutual positional relationship between a region where the touch data is acquired and a horizontal line where the digital video data is displayed. delete The method according to claim 6,
The step of deriving the noise data comprises:
Wherein the display position of the received digital video data for one horizontal line is further based on the received display position of the digital video data. The method according to claim 6,
The touch data, in which the noise data is reflected,
And the touch data obtained at the trigger point of the source output enable signal for displaying the received digital video data for one horizontal line.

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