KR20170081017A - Finger sensor integrated type touch screen panel and driving method of the same - Google Patents

Abstract

The present invention relates to a fingerprint sensor integrated touch screen apparatus and a driving method thereof. Touch sensing and fingerprint sensing can be performed in one touch screen by using line electrodes arranged in a fine pattern so that fingerprint sensing can be performed. The touch sensing is performed by the self-capacitance driving method, and the fingerprint sensing is performed by the mutual capacitance driving method. This is to prevent deterioration of the touch performance caused by an increase in mutual capacitance due to the fine electrode pattern. By enabling fingerprint sensing on the touch panel, various designs and UI / UX can be provided.

Description

Technical Field [0001] The present invention relates to a fingerprint sensor integrated touch screen device and a driving method thereof,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a fingerprint sensor integrated touch screen device, and more particularly, to a touch screen device having a fingerprint recognition function.

With the development of computer technology, various applications such as a notebook computer, a tablet PC, a smart phone, a personal digital assistant, an automated teller machine, a search guide system, Computer based systems have been developed. Because these systems typically store a large amount of confidential data such as business information or business secrets, as well as personal information related to personal privacy, there is a need to enhance security to protect these data.

For this purpose, there has been known a fingerprint sensor capable of enhancing security by registering or authenticating a system using a fingerprint of a finger.

The fingerprint sensor is a sensor that detects a human fingerprint. The fingerprint sensor is roughly divided into an optical fingerprint sensor and a capacitive fingerprint sensor.

An optical fingerprint sensor uses a principle of irradiating a light source such as an LED (Light Emitting Diode) or the like and detecting light reflected by a ridge of a fingerprint through a CMOS image sensor. The optical fingerprint sensor has a limitation in reducing the size because it is required to scan using the LED, and the manufacturing cost is increased because the light source itself is expensive.

A capacitive fingerprint sensor utilizes a difference in the quantity of electricity charged between a ridge and a valley in contact with the fingerprint sensor.

A conventional capacitive fingerprint sensor is known as "capacitive sensor packaging ", US Patent Publication No. US2013 / 0307818 published on November 21, 2013. The capacitance type fingerprint sensor disclosed in the above-mentioned US Patent Publication is configured in the form of an assembly combined with a specific push button, and a circuit for measuring the capacitance between the capacitive plate and the user's fingerprint (ridge and valley) A silicon wafer is printed.

Generally, ridges and valleys of human fingerprints are very small in size from about 300 μm to 500 μm. Therefore, the capacitive fingerprint sensor of the above-mentioned United States publication uses a high-resolution sensor array and an IC Integrated Chip) is required, and a silicon wafer that can form an integrated sensor array and IC is used. However, when a high-resolution sensor array and an IC are formed together using a silicon wafer, an assembly structure for combining a fingerprint sensor with a push button is required, which not only complicates the configuration but also increases the non-display area (bezel area) . Further, since the push button (for example, a home key of a smart phone) and the fingerprint sensor are formed to overlap with each other, not only the thickness increases but also the fingerprint sensing area depends on the size of the push button.

In order to solve such a problem, a technique of using the area of the touch sensor screen as a fingerprint identification area has been developed. US Patent No. 8,564, 314 entitled " Capacitive Touch Sensor for Identifying a Fingerprint ", entitled " Fingerprint Identification Integrated Capacitive Touch Screen Korean Patent No. 10-1432988, which was registered on Aug. 18, 2014, is known.

FIG. 1 is a plan view schematically showing an arrangement of a driving electrode and a sensing electrode of a capacitive sensing panel, which is shown in FIG. 1, the capacitive touch sensor for fingerprint identification includes a touch sensor 3 including a touch driving electrode 1 (x) and a touch sensing electrode 1 (y), a fingerprint driving electrode 5 (x ) And a fingerprint sensing electrode 5 (y).

In the capacitive touch sensor for fingerprint identification, the touch electrode region for touch sensing and the fingerprint electrode region for fingerprint sensing are electrically separated, so that the touch sensing and the fingerprint sensing can not be realized with the same electrode. This technique requires the signal wiring and the driving IC connected to the touch sensor 3, the signal wiring connected to the fingerprint sensor 5, and the driving IC to be connected to the fingerprint sensor 5 because the touch sensor 3 and the fingerprint sensor 5 must be formed separately Respectively. This technology is somewhat inconvenient to use because it is possible to recognize fingerprint only in a predetermined area rather than the whole area. In this technique, the fingerprint sensor 5, like the touch sensor 3, can not be formed in the image display area but must be formed outside the image display area. When the fingerprint sensor 5 is present in the image display area, the difference in the electrode pattern between the fingerprint sensor 5 and the touch sensor 3 (the fingerprint sensor 5 has a higher resolution than the touch sensor 3) There is a difference.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fingerprint sensor integrated touch screen device in which a fingerprint recognition function is implemented in a touch screen area by disposing electrode patterns closely enough to enable fingerprint recognition. It is another object of the present invention to provide a driving method in which the mutual capacitance between the touch electrodes is increased due to the microelectrode pattern, and the touch performance is not degraded despite the mutual capacitance which is increased.

In order to achieve the above object, a fingerprint sensor integrated touchscreen device according to the present invention arranges touch electrodes of a touch area so as to be used for fingerprint identification, so that a desired area is used for fingerprint recognition and other areas are used for touch sensing .

In the touch sensing mode, a self-capacitive type touch driving is performed to reduce the influence due to the increased mutual capacitance due to the fine electrode pattern. In the fingerprint mode, mutual- capacitive type touch driving.

In the touch sensing mode, electrodes of a fine pattern are grouped to enable touch sensing on a block-by-block basis. In the fingerprint sensing mode, electrodes in the fingerprint recognition area 400 are driven in units of electrodes to sense fingerprints.

The touch / fingerprint electrodes of the touch area except for the fingerprint recognition area 400 are electrically connected to the touch / fingerprint driver circuit in block units at the outer edge of the touch sensor panel. The touch / fingerprint electrode block passing through the fingerprint recognition area 400 is connected to the mux circuit at the outer edge of the touch sensor panel. As described above, the number of channels between the touch sensor panel and the touch / fingerprint driver circuit can be reduced by connecting the touch / fingerprint electrodes to the touch / fingerprint driver circuit block by block.

In the fingerprint identification area, a circuit is added between the touch sensor panel and the touch / fingerprint driver circuit so that the driving method may be different depending on the touch mode and the fingerprint mode.

The present invention provides a fingerprint sensor integrated touchscreen device and a driving method that enable fingerprint sensing in a touch screen area without a separate fingerprint sensing area on the outside of the touch screen to enable various designs and apply a fingerprint sensing function . For example, smart phones can eliminate push-buttons to improve design diversity and provide fingerprint sensing in smart clocks with limited space.

The self-capacitance driving method is used for the touch sensing, and the mutual capacitance driving method is used for the fingerprint sensing. By using the self-capacitance driving method, the touch sensing performance which can be degraded due to the mutual capacitance increased during the block driving Thereby enabling a fingerprint sensor integrated type screen device without deteriorating the touch performance.

Provides intuitive UI / UX to enhance user convenience. It is intuitive that the touch area and the fingerprint area are at the same place, and the display area and the fingerprint area are located at the same place, which can provide a more intuitive UI / UX.

In addition, touch function and fingerprint sensing function can be implemented on the touch screen.

Finally, the problem of the deterioration of the touch performance, which may be caused by the fingerprint identification area entering into the touch screen area, is resolved, and the touch function and the fingerprint identification function .

1 is a plan view schematically showing an arrangement of a driving electrode and a sensing electrode of a conventional capacitive sensing panel.
2 is a block diagram showing a display device according to an embodiment of the present invention;
FIG. 3 is a view showing a fingerprint sensor integrated touch screen device in FIG. 2; FIG.
4A is a waveform diagram showing a touch driving signal supplied to the first touch / fingerprint line electrodes in the touch mode.
FIG. 4B is a waveform diagram showing a fingerprint driving signal supplied to the first touch / fingerprint line electrodes in the fingerprint mode. FIG.
5 shows a circuit inserted between a touch / fingerprint driver circuit and a touch screen.

The display device to which the fingerprint sensor integrated touch screen device of the present invention is applied includes a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP) A light emitting diode display device (OLED), and an electrophoresis display device (EPD). 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 the display device of the present invention is not limited to a liquid crystal display device.

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, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 2 shows a display device to which a fingerprint sensor integrated touch screen device according to an embodiment of the present invention is applied. FIG. 3 shows the fingerprint sensor integrated touch screen device included in FIG. 2 in detail.

Referring to FIGS. 2 and 3, the fingerprint sensor integrated touch screen device of the present invention includes a touch sensor panel (TSP) and a touch / fingerprint driver circuit 20.

The fingerprint sensor integrated touch screen device of the present invention can be implemented as a touch sensor panel (TSP) that senses a touch input through an electrostatic capacity driving method.

The capacitive touch sensor panel includes a plurality of electrodes having a capacitance. Capacitance can be divided into Self Capacitance and Mutual Capacitance. The self-capacitance can be formed along a single-layer conductor electrode formed in one direction, and the mutual capacitance can be formed between two orthogonal conductor electrodes.

The touch sensor panel TSP including the capacitive electrodes includes first touch / fingerprint line electrodes 100 arranged side by side along a first direction, first touch / fingerprint line electrodes 100 arranged side by side along a second direction, Second finger / fingerprint line electrodes 200 crossing the line electrodes, and an insulating layer positioned between the first touch / fingerprint line electrodes and the second touch / fingerprint line electrode. The interval between the first touch / fingerprint line electrodes 100 and the interval between the second touch / fingerprint line electrodes is set to 50 micrometers or less to enable fingerprint recognition. Since the ridges and valleys of the fingerprints are 300 to 500 micrometers, the fingerprint can be recognized by arranging the electrodes with a fine electrode pattern of 50 micrometers or less.

The touch / fingerprint driver circuit supplies the touch driving signal 300 to the first and second touch / fingerprint line electrodes and senses the self capacitance of the first and second touch / fingerprint line electrodes. Since the value of the self capacitance is changed depending on the presence or absence of the touch input, the presence or absence of the touch input can be determined according to the self capacitance value. In this way, a method of detecting the presence or absence of a touch by detecting a different capacitance of the same electrode is called self-capacitive type driving, and in the present invention, the touch sensor is driven by a self-capacitance driving method .

In the present invention, the fingerprint sensor uses all or a part of the electrode pattern of the touch sensor, which is referred to as a fingerprint recognition area 400 in the present invention. Unlike the touch sensing mode in which the touch sensing mode is sensed by sensing the self capacitance value, the fingerprint sensing mode is a mode in which the mutual interactions between the first touch / fingerprint line electrode 100 and the second touch / fingerprint line electrode 200 The fingerprint is identified through the capacitance value. The touch / fingerprint electrodes 101 and 202 of the fingerprint recognition area 400 serve as touch sensors in the touch sensing mode and fingerprint sensors in the fingerprint sensing mode. Since the touch sensor and the fingerprint sensor have the same electrode pattern, the visibility problem due to the difference in the electrode pattern between the fingerprint sensor and the touch sensor does not occur as in the prior art.

The touch screen TSP may be add-on type on the upper polarizer plate of the display panel or may be on-cell type between the upper polarizer plate and the upper substrate of the display panel. The touch sensor and the fingerprint sensors may be in-cell type in a pixel array of a display panel (DIS).

The first touch / fingerprint line electrodes 100 and the second touch / fingerprint line electrodes 200 are formed in a fine pattern, that is, a high density electrode pattern, on the touch screen TSP for the fingerprint sensor integrated touch screen implementation. Therefore, there is an advantage that fingerprint recognition can be performed for the entire area of the touch screen TSP. When only a partial area of the touch screen TSP is used for fingerprint recognition, only a part of the area can be used.

Since the first and second touch / fingerprint line electrodes 100 and 200 are formed in a high-density electrode pattern finely implemented so that a plurality of lines can be positioned between the ridges and the valleys of the fingerprint, accurate fingerprint sensing becomes possible.

The configuration of the apparatuses according to Embodiments 1, 2, and 3 of the present invention will be described. 3 shows a first embodiment in which a part of the touch screen is used as a fingerprint sensor. A portion indicated by the fingerprint recognition area 400 is a fingerprint sensing area, and the other area is a touch recognition area. The first and second touch / fingerprint line electrodes 101 and 201 passing through the fingerprint recognition area 400 are connected to the touch / fingerprint driver circuit 500 by being muxed from the outside of the touch panel, And the second touch / fingerprint line electrodes 102 and 202 are connected to the touch / fingerprint driver circuit 500 by one electrode or wiring without MUX outside the touch screen. In the first embodiment, the fingerprint recognition area 400 is located at the center of the touch panel. However, the fingerprint recognition area 400 can be located anywhere on the touch panel, and the first and second touch / The fingerprint electrode lines 101 and 201 are provided with MUXs between the touch / fingerprint driver circuit 500 and the first and second touch / fingerprint line electrodes 101 and 201 to generate fingerprint driving signals at different timings .

In the first embodiment, the fingerprint recognition area 400 is a part of the touch panel, but the fingerprint recognition area 400 may be the entire touch panel as in the second embodiment. In this case, all the first and second touch / fingerprint line electrodes 100 and 200 are connected to the touch / fingerprint driver circuit 500 through the MUX on a block-by-block basis.

As in the second embodiment, the entire touch panel may be the fingerprint recognition area 400 in terms of devices, and a part of the touch panel may be used for fingerprint recognition through the touch / fingerprint driver circuit 500. This is the third embodiment.

The driving method of the first, second, and third embodiments will be described. The touch sensing mode and the fingerprint sensing mode of each embodiment will be described for each of the embodiments, and redundant descriptions will be omitted in each embodiment.

3, which is one of the first embodiment, the touch / fingerprint driver circuit 500 is connected to the first and second touch / fingerprint line electrodes (P1 to P6) through the ports 1-6 (P1 to P6) The touch / fingerprint driver circuit 500 senses the self-capacitance of the first and second touch / fingerprint line electrodes 100 and 200. The number of ports here depends on how the touch screen is divided and is not limited to six.

The touch / fingerprint driver circuit 500 supplies the touch driving signal 300 to the touch / fingerprint line electrodes 101 and 201 connected to the ports 2 and 5 through the MUX of the port 2 and the port 5 And the MUX simultaneously supplies the touch driving signal 300 supplied from the touch / fingerprint driving circuit 500 to all the touch / fingerprint line electrodes 100 and 200 connected thereto. However, if necessary, the MUX may be operated to divide and group the line electrodes connected to one port, to transmit a touch driving signal at different driving timing for each group, and to detect the self capacitance.

In the touch sensing mode, since the resolution is not required to be higher than that in the fingerprint sensing, it is common that the touch sensing mode is driven at the block unit connected to the port at the same time, thereby reducing the driving time, power consumption and touch report rate. When the touch mode is driven by mutual capacitive-type driving and the touch driving signal is simultaneously supplied to each block, the mutual capacitance is greatly increased and the touch performance may be deteriorated. However, (self-capacitive type driving) so that the touch performance is not deteriorated.

In the fingerprint sensing mode, a fingerprint drive signal 301 is transmitted only to a portion set in the fingerprint recognition area 400. [ 3, a fingerprint driving signal FTx is sent to the first touch / fingerprint line electrodes 101 connected to the port 2 (P2) of the touch / fingerprint driver circuit, and connected to the port 5 (P5) of the touch / fingerprint driver circuit And receives the fingerprint sensing signal FRx from the second touch / fingerprint line electrodes 201. The touch / fingerprint driver circuit 500 can detect the mutual capacitance generated between the first touch / fingerprint line electrode and the second touch / fingerprint line electrode using the fingerprint sensing signal FRx. The reciprocal capacitance driving method does not require a large number of channels. In the prior touch sensing mode, even if the self capacitance driving method is used, many channels are not required because the sensing is performed block by block.

  The touch sensing mode of the second embodiment is not different from the touch sensing mode of the first embodiment. The entire touch panel area is a fingerprint recognition area 400 and the entire touch / fingerprint line electrodes 100 and 200 passing through the touch panel are connected to the touch / fingerprint driver circuit 500 through the MUX. Like the first embodiment, each MUX supplies the touch driving signal 300 to all connected touch / fingerprint line electrodes. However, if necessary, the MUX may be operated to divide and group the line electrodes connected to one port, to transmit the touch driving signal at different driving timing for each group, and receive the touch sensing signal.

  In the fingerprint sensing mode of the second embodiment, since the whole touch panel is the fingerprint recognition area 400, it is firstly sensed whether or not the touch input is performed in order to quickly detect a portion where the finger is positioned and reduce the sensing time, power consumption and touch report rate , And a driving method in which fingerprint sensing is performed in detail only for a specific area in which the touch is recognized is also possible. That is, in the fingerprint mode, the presence or absence of the fingerprint input is detected in units of blocks for the first sensing period (block sensing period), and the second sensing period (line sensing period) is detected when the fingerprint input is detected. The fingerprint input can be sensed in units of individual touch / fingerprint line electrodes. Using this method, rather than sensing line-electrode units for the entire area of the touch panel, it is possible to identify the location of the fingerprint first, and to sense the fingerprint form only at the portion where the fingerprint is input, .

Here, the unit of the block may be the number of touch / fingerprint line electrodes connected to one MUX, and may be set in other units. The operation in the primary sensing period of the fingerprint sensing mode is substantially the same as the touch sensing mode. In the second sensing period, a fingerprint driving signal (FTx) is sent to a block composed of the first touch / fingerprint line electrodes in a region where the touch is recognized, and a fingerprint sensing signal Receives the signal (FRx) and senses the mutual capacitance.

The driving method of the touch sensing mode of the third embodiment is not different from the touch sensing mode of the second embodiment. The driving method of the fingerprint sensing mode of the third embodiment is the same as the driving method of the fingerprint sensing mode of the first embodiment. In the third embodiment, since fingerprint recognition is possible in all areas of the touch screen and the area used for fingerprint recognition is given in the third embodiment, only the touch / fingerprint driver circuit 500 and the touch / fingerprint controller And the area used for fingerprint recognition may be changed as needed.

The following describes the touch sensing mode and the fingerprint sensing mode operation of the touch / fingerprint driver circuit.

The touch / fingerprint driver circuit 500 supplies the touch / fingerprint driver signals 300 and 301 to the touch / fingerprint line electrodes 100 and 200 and outputs the self capacitance and the mutual capacitance through the fingerprint sensing signal 302 Detection. The touch / fingerprint driver circuit 500 supplies a touch driving signal 300 to the touch / fingerprint line electrodes 100 and 200 in groups as shown in FIG. 4A under the control of the touch / fingerprint controller, (100, 200) and converts it into digital data. Digital data output from the touch / fingerprint driver circuit is transmitted to the touch / fingerprint controller.

In the fingerprint sensing mode of the first and third embodiments, the touch / fingerprint driver circuit 500 controls the first touch / fingerprint line electrode 101 (see FIG. 4 And receives the fingerprint sensing signal FRx from the second touch / fingerprint line electrodes 201 to convert the fingerprint sensing signal FRx into digital data. In the fingerprint sensing mode of the second embodiment, the touch / fingerprint driver circuit 500 detects the presence or absence of a fingerprint (touch) input in block units during a primary sensing period (block sensing period) under the control of the touch / fingerprint controller, (Line sensing period) when the input is detected, the fingerprint input can be sensed on a touch / fingerprint line electrode basis only for the block in which the fingerprint input is generated. The touch / fingerprint driver circuit 500 supplies the fingerprint drive signal FTx to the first touch / fingerprint line electrodes connected to the block of the area determined to be touched during the first sensing period, The fingerprint sensing signal FRx is received from the second touch / fingerprint line electrodes connected to the block of the identified region and converted into digital data.

The touch / fingerprint driver circuit 500 includes a MUX circuit for driving the touch / fingerprint line electrodes 100 and 200 on a block-by-block basis or on a line-by-line basis. In the touch sensing mode, the touch / fingerprint driver circuit 500 sets a channel for outputting the touch driving signal 300 in block units (or line units) in response to a setup signal input from the touch / fingerprint controller.

In the fingerprint sensing mode, the touch / fingerprint driver circuit 500 outputs a channel for outputting the fingerprint drive signal FTx and a channel for receiving the fingerprint sensing signal FRx in units of lines in response to a setup signal input from the touch / fingerprint controller Setting. In the first and third embodiments, a setup signal is sent from the touch / fingerprint controller to the predetermined fingerprint recognition area 400, and in the second embodiment, the touch is sensed in units of blocks as in the touch mode, The touch / fingerprint controller sends a setup signal to the touch / fingerprint driver circuit 500 to set a channel for receiving the fingerprint drive signal FTx and a channel for receiving the fingerprint sensing signal FRx in a line unit. The touch / fingerprint driver circuit 500 can convert the received fingerprint sensing signal FRx into digital data. The digital data output from the touch / fingerprint driver circuit 500 is transmitted to the touch / fingerprint controller.

A touch / fingerprint controller setup signal is supplied to the touch / fingerprint driver circuit 500 to set a channel for sensing a change in self capacitance, a touch drive signal 300 is output, and a channel for transmitting the fingerprint drive signal FTx And selects the channel on which the fingerprint sensing signal FRx is to be received. The touch controller supplies a sampling clock for controlling the sampling timing of the sampling circuit incorporated in the touch / fingerprint driver circuit to the touch / fingerprint driver circuit 500 to generate a touch sensing signal as a self capacitance signal and a fingerprint sensing signal FRx The timing of the sampling operation is controlled. The touch / fingerprint controller supplies the ADC clock to the analog-to-digital converter built in the touch / fingerprint driver circuit 500 to control the analog-to-digital conversion timing.

The touch / fingerprint controller analyzes the digital data received from the touch / fingerprint driver circuit 500 in the touch mode and outputs touch information. The touch / fingerprint controller analyzes the digital data in the block sensing period (first sensing period) in the fingerprint sensing mode of the second embodiment to determine whether a fingerprint is input. When the fingerprint input is detected, the touch / And sets a channel for transmitting the fingerprint drive signal FTx and a channel for receiving the fingerprint sensing signal FRx. If no fingerprint input is detected during the block sensing period, the touch / fingerprint controller may skip the subsequent process for fingerprint recognition. In the first and third embodiments, a setup signal is sent to the touch / fingerprint driver circuit 500 so that a channel can be set for a portion set in the fingerprint recognition area 400. The touch / fingerprint controller analyzes the digital data input from the touch / fingerprint driver circuit 500 and outputs touch information and fingerprint information. Touch information and fingerprint information output from the touch controller are transmitted to the host system.

The display device to which the fingerprint sensor integrated touch screen device of the present invention is applied may include a display panel (DIS), a display drive circuit (12, 14, 16), and a host system (18).

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 region defined by the data lines (D1 to Dm, m is a positive integer) and the gate lines (G1 to Gn, n is a positive integer) . Each of the pixels is connected to TFTs (Thin Film Transistors) formed at intersections of the data lines D1 to Dm and the gate lines G1 to Gn, a pixel electrode for charging a data voltage, A storage capacitor (Cst) for maintaining a voltage, and the like.

A black matrix, a color filter, and the like may be formed on the upper substrate of the display panel DIS. 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. 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. On the upper substrate and the lower substrate of the display panel DIS, a polarizing plate is attached, and an alignment film for forming a pre-tilt angle of the liquid crystal on the inner surface in contact with the liquid crystal is formed. 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 below the rear surface of the display panel DIS. The backlight unit is implemented as an edge type or direct type backlight unit, and irradiates the display panel (DIS) with light. 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 driving circuit includes a data driving circuit 12, a scan driving circuit 14, and a timing controller 16, and writes video data of the input image to pixels of the display panel DIS. The data driving circuit 12 converts the digital video data RGB input from the timing controller 16 into an analog positive / negative gamma compensation voltage to output a 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 a gate pulse (or a scan pulse) synchronized with the data voltage to the gate lines G1 to Gn to select a pixel line of the display panel DIS to which the data voltage is written.

The timing controller 16 inputs timing signals such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable signal DE and a main clock MCLK input from the host system 18 And synchronizes the operation timings of the data driving circuit 12 and the scan driving circuit 14 with each other. 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 host system 18 is 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, Video data can be input from an external video source device. The host system 18 converts image data from an external video source device into a format suitable for display on a display panel (DIS), including a system on chip (SoC) including a scaler. Further, the host system 18 executes an application program associated with touch information or fingerprint information input from the touch / fingerprint controller.

4A shows the touch driving signal 300 supplied to the first touch / fingerprint line electrodes 100 in the touch sensing mode. 4B shows a fingerprint driving signal FTx supplied to the touch / fingerprint line electrodes 101 corresponding to the fingerprint recognition area 400 in the fingerprint sensing mode.

In order to sense the touch input on a block basis in the touch sensing mode, the touch / fingerprint driver circuit 500 controls the operation of the mux circuit so that the touch / fingerprint line electrodes 100 are connected to the touch / Respectively.

In order to sense the fingerprint input in units of lines in the fingerprint sensing mode, the touch / fingerprint driver circuit 500 controls the operation of the mux circuit so that the first touch / fingerprint of the group corresponding to the fingerprint recognition area 400 And sequentially applies the fingerprint drive signal FTx to the line electrodes 101 individually.

5 is a diagram of an integration block IB for amplifying a touch sensing signal and a fingerprint sensing signal FRx located between a touch screen and a touch / fingerprint driver circuit of the present invention. The integration block IB may be embedded in the touch / fingerprint driver circuit 500. The integrators of the integration block IB integrate the touch sensing signal and the fingerprint sensing signal FRx input through the first and second touch / fingerprint line electrodes, and the integrated signals are input to the MUX circuit And is converted into a digital signal by the ADC of the touch / fingerprint driver circuit 500 and supplied to the touch / fingerprint controller.

The method of driving the fingerprint sensor integrated touch screen according to the present invention can be expressed in the following steps. The driving method of the first and third embodiments includes the steps of supplying a touch driving signal to touch / fingerprint line electrodes on a block-by-block basis in a touch sensing mode and supplying a touch sensing signal from the touch / ). The touch / fingerprint driver circuit 500 converts the touch sensing signal into digital data and supplies the digital data to the touch / fingerprint controller (S12). The touch / fingerprint controller analyzes the digital data and outputs the touch information to the host system (S13). In the fingerprint mode, the fingerprint driving signal FTx is supplied to the first touch / fingerprint line electrodes corresponding to the fingerprint recognition area 400 on a line basis, and the fingerprint sensing signal (Step S14). The touch / fingerprint driver circuit 500 converts the fingerprint sensing signal into digital data and supplies it to the touch / fingerprint controller (S15). The touch / fingerprint controller may analyze the digital data and output the touch information to the host system (S16).

The driving method of the second embodiment supplies the touch driving signal 300 to the touch / fingerprint line electrodes 100 and 200 in units of blocks in the touch sensing mode and outputs the touch sensing signal from the touch / A step of receiving a signal (S21). The touch / fingerprint driver circuit 500 converts the touch sensing signal into digital data and supplies the digital data to the touch / fingerprint controller (S22). The touch / fingerprint controller analyzes the digital data and outputs the touch information to the host system (S23). (S24) a touch sensing signal is supplied from the touch / fingerprint line electrodes which supply a touch driving signal to the touch / fingerprint line electrodes 100 and 200 in block units in the fingerprint sensing mode and supply the driving signal. The fingerprint driving signal FTx is supplied to the first touch / fingerprint line electrodes of the touched block in the fingerprint mode and the fingerprint sensing signal FRx is supplied from the second touch / fingerprint line electrodes of the touched block , And returns to the touch sensing mode when there is no touch (S25). The touch / fingerprint driver circuit 500 converts the fingerprint sensing signal into digital data and supplies it to the touch / fingerprint controller (S26). The touch / fingerprint controller analyzes the digital data and outputs the touch information to the host system (S27).

As described above, the present invention enables both touch sensing and fingerprint sensing on a touch screen without a separate fingerprint sensing part as a microelectrode pattern. In touch sensing, the microelectrode pattern is magnetostatically driven The fingerprint input can be sensed using the mutual capacitance driving method with respect to the fingerprint recognition area 400 of the touch screen at the time of fingerprint sensing. When the fingerprint recognizable area is wide, the position of the fingerprint can be sensed using the self-capacitance driving method, and the fingerprint input can be precisely sensed using the mutual capacitance driving method only for the position where the fingerprint is present.

The self-capacitance driving method is used in the touch sensing mode and the mutual capacitance driving method is used in the fingerprint sensing mode, thereby preventing the performance degradation of the touch due to the mutual capacitance increasing in the fine electrode pattern. Also, since the fingerprint can be sensed in the touch panel, various designs are possible, and it is not necessary to allocate a separate space for fingerprint sensing, which is useful when touch and fingerprint are needed at the same time.

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.

DIS: Display panel TSP: Touch screen
12: Data driving circuit 14: Scan driving circuit
20: timing controller 100: first touch / fingerprint line electrode
101: First touch / fingerprint line electrode passing through the fingerprint recognition area
102: first touch / fingerprint line electrode not passing through the fingerprint recognition area
200: second touch / fingerprint line electrode
201: a second touch / fingerprint line electrode passing the fingerprint recognition area
202: a second touch / fingerprint line electrode not passing through the fingerprint recognition area
300: Touch driving signal 301: Fingerprint driving signal
302: fingerprint sensing signal 400: fingerprint recognition area
500: touch / fingerprint driver circuit P1 to P6: ports 1 to 6

Claims (9)

A touch sensor panel including touch / fingerprint electrodes having a plurality of first touch / fingerprint line electrodes and a plurality of second touch / fingerprint line electrodes crossing the first touch / fingerprint line electrodes;
A fingerprint recognition area having at least a part of the touch sensor panel as an area;
The first touch / fingerprint line electrodes passing through the fingerprint recognition area in the fingerprint sensing mode, the first touch / fingerprint line electrodes passing through the fingerprint sensing area in the fingerprint sensing mode, A touch / fingerprint driver circuit for supplying a fingerprint driving signal to the touch / fingerprint sensing area and receiving a fingerprint sensing signal from the second touch / fingerprint line electrodes passing through the fingerprint recognition area;
A fingerprint sensor integrated touch screen device including a touch / fingerprint controller for controlling the touch / fingerprint driver circuit and analyzing digital data received from the touch / fingerprint driver circuit to generate a touch signal
The method according to claim 1,
Wherein the touch / fingerprint driver circuit supplies the touch driving signal in units of blocks in the touch sensing mode, detects a capacitance change of the touch / fingerprint electrodes,
Wherein the block comprises at least two of the first touch / fingerprint line electrodes or at least two of the second touch / fingerprint line electrodes,
The touch / fingerprint line electrodes of the block passing through the fingerprint recognition area are connected to the mux circuit, and the touch / fingerprint line electrodes of the block not passing the fingerprint recognition area are electrically connected in the block.
3. The method of claim 2,
Wherein the touch / fingerprint driver circuit supplies the fingerprint drive signal in units of line electrodes during the fingerprint type sensing period, and receives the fingerprint sensing signal in units of electrodes,
3. The method of claim 2,
Wherein the fingerprint sensing mode is a fingerprint sensing operation of supplying the touch driving signal to the touch / fingerprint electrodes on a block-by-block basis with respect to the blocks passing through the fingerprint recognition area and detecting a capacitance change of the touch / fingerprint electrodes Includes more touch / fingerprint drivers.
5. The method of claim 4,
The fingerprint sensing mode is a touch / fingerprint driver circuit for sensing the fingerprint type when the position of the fingerprint is sensed by the fingerprint position sensing
5. The method of claim 4,
The touch sensing mode and the fingerprint sensing mode are alternately repeated,
Wherein the fingerprint sensing period and the fingerprint sensing period are alternately repeated in the fingerprint sensing mode for a predetermined period of time.
The method according to claim 1,
Wherein the first line electrodes and the second line electrodes are 50 micrometers or less,
A display panel on which a plurality of subpixels defined by a plurality of data lines and a plurality of gate lines are arranged;
A data driver for driving the plurality of data lines;
A scan driver for driving the plurality of gate lines;
A timing controller for controlling the data driver and the scan driver;
A touch sensor panel including touch / fingerprint electrodes including a plurality of first line electrodes and a plurality of second line electrodes crossing the first line electrodes;
A fingerprint recognition area having at least a part of the touch sensor panel as an area;
A touch sensing mode for supplying a touch driving signal to the touch / fingerprint electrodes and sensing a change in the self capacitance of the touch / fingerprint electrodes, a fingerprint sensor for applying a fingerprint sensing signal to the first line electrodes passing through the fingerprint sensing area in a fingerprint sensing mode, A touch / fingerprint driver circuit including fingerprint type sensing for supplying a fingerprint sensing signal from the second line electrodes passing through the fingerprint recognition area,
And a touch / fingerprint controller for controlling the touch / fingerprint driver circuit and analyzing the digital data received from the touch / fingerprint driver circuit to generate a touch signal,
A step of supplying a touch driving signal to the touch / fingerprint line electrodes in the touch sensing mode and receiving a touch sensing signal from the touch / fingerprint line electrodes supplied with the touch driving signal;
The touch / fingerprint driver circuit converts the touch sensing signal into touch digital data and supplies the touch digital data to the touch / fingerprint controller;
The touch / fingerprint controller analyzing the touch digital data and outputting touch information to the host system;
Supplying a fingerprint driving signal to the first touch / fingerprint line electrodes corresponding to the fingerprint recognition area in a line unit and supplying the fingerprint sensing signal in line units through the second touch / fingerprint line electrodes in the fingerprint sensing mode;
The touch / fingerprint driver circuit converts the fingerprint sensing signal into fingerprint digital data and supplies the fingerprint digital data to the touch / fingerprint controller
Wherein the touch / fingerprint controller analyzes the fingerprint digital data and outputs fingerprint information to the host system.

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