KR101764014B1 - Electronic device having a touch sensor and driving method thereof - Google Patents

Electronic device having a touch sensor and driving method thereof Download PDF

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KR101764014B1
KR101764014B1 KR1020150136834A KR20150136834A KR101764014B1 KR 101764014 B1 KR101764014 B1 KR 101764014B1 KR 1020150136834 A KR1020150136834 A KR 1020150136834A KR 20150136834 A KR20150136834 A KR 20150136834A KR 101764014 B1 KR101764014 B1 KR 101764014B1
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touch
touch screen
display panel
sensing
sensing method
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KR1020150136834A
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Korean (ko)
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KR20160041770A (en
Inventor
강형원
전재훈
이덕효
김범진
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엘지디스플레이 주식회사
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Priority to TW104132497A priority Critical patent/TWI581165B/en
Priority to US14/875,502 priority patent/US9904404B2/en
Priority to EP15188531.6A priority patent/EP3007035B1/en
Priority to CN201510647203.4A priority patent/CN105487704B/en
Publication of KR20160041770A publication Critical patent/KR20160041770A/en
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Position Input By Displaying (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)

Abstract

The present invention provides an electronic device having a touch sensor including a display panel, a touch screen, and a touch screen drive circuit. The display panel displays the image. The touch screen is composed of electrodes positioned on the display panel. The touch screen driving circuit drives the touch screen in accordance with the display mode of the display panel, and switches the sensing mode to drive the touch screen by the first touch sensing method or by the second touch sensing method different from the first touch sensing method .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electronic device having a touch sensor,

The present invention relates to an electronic device having a touch sensor and a driving method thereof.

Various electronic devices, such as household appliances and portable information devices, have been replaced by touch sensors in a button-type switch in accordance with the trend of weight reduction and slimness. Accordingly, an electronic device such as a display device or the like that has recently been introduced has a touch sensor (or a touch screen).

Touch sensors are essential for portable information devices such as smart phones, and are being widely applied to notebook computers, computer monitors, and home appliances. Recently, a technology (hereinafter referred to as "In-cell touch sensor") in which a touch sensor is embedded in a pixel array of a display panel has been proposed.

Incelel touch sensor technology can install touch sensors on the display panel without increasing the thickness of the display panel. An electronic device having an in-cell touch sensor includes a period for driving pixels (also referred to as a " display driving period ") and a period for driving touch sensors (referred to as a" Quot; touch screen driving period ").

The Insel touch sensor technology utilizes the electrodes connected to the pixels of the display panel as the electrodes of the touch sensors. For example, in the case of the in-line touch sensor technology, an example has been proposed in which a common electrode for supplying a common voltage to pixels of a liquid crystal display is divided and used as electrodes of touch sensors.

In addition, a function of entering the sleep mode (or the idle mode) when the display device is not used has been proposed in the in-cell touch sensor technology. In the sleep mode, the power consumption of the device is lowered by stopping the display panel or the like when the display device is not used. However, in the conventional sleep mode method, there is a need to continue studies for reducing power consumption.

In order to solve the above problems, the present invention provides an electronic device having a touch sensor capable of lowering power consumption while maintaining stability and reliability of driving during a specific mode (e.g., sleep mode), and a driving method thereof .

The present invention provides an electronic device having a touch sensor including a display panel, a touch screen, and a touch screen driving circuit. The display panel displays the image. The touch screen is composed of electrodes positioned on the display panel. The touch screen driving circuit drives the touch screen in accordance with the display mode of the display panel, and switches the sensing mode to drive the touch screen by the first touch sensing method or by the second touch sensing method different from the first touch sensing method .

The touch screen drive circuit may be switched to a self-touch sensing mode or a mutual touch sensing mode according to the display mode of the display panel.

The touch screen drive circuit drives the touch screen by the self-touch sensing method when the display panel is in the normal mode displaying the image, and the touch screen is driven by the mutual touch sensing method when the display panel is in the sleep mode can do.

When the touch screen driving circuit drives the touch screen by the second touch sensing method, the electrodes configured in a block (or point) form of the touch screen may be shorted by at least one line in the first direction of the touch screen.

When the touch screen driving circuit drives the touch screen by the second touch sensing method, the electrodes formed in the form of a block (or point) of the touch screen include one line with respect to the first direction of the touch screen, N Lines or both can be shorted.

In another aspect, the present invention provides an electronic device having a touch sensor including a display panel, a touch screen, and a touch screen drive circuit. The display panel displays the image. The touch screen is composed of electrodes positioned on the display panel. The touch screen driver circuit controls the electrodes formed in the block (or point) form of the touch screen to be shorted by at least one line in the first direction of the touch screen.

In another aspect, the present invention provides a method of driving an electronic device having a touch sensor. A method of driving an electronic device having a touch sensor includes displaying an image on a display panel and driving a touch screen built in the display panel using a first touch sensing method; Driving the touch screen by a second touch sensing method different from the first touch sensing method, entering the sleep mode when no input is present, displaying an image on the display panel, and driving the touch screen. And when the knock-on operation for touching the display panel occurs, the sleep mode is canceled and the image is displayed on the display panel, and the sensing mode is switched from the second touch sensing mode to the first touch sensing mode.

The first touch sensing method may be selected by the self-touch sensing method, and the second touch sensing method may be selected by the mutual touch sensing method.

When driving the touch screen by the second touch sensing method, the electrodes formed in the form of a block (or point) of the touch screen include one line with respect to the first direction of the touch screen, N lines with respect to the first direction, .

The present invention has the effect of lowering the power consumption while maintaining stability and reliability of driving while the electronic device having the touch sensor performs a specific mode (e.g., sleep mode). In addition, the present invention has an effect that the electronic device having the touch sensor can switch the sensing method such as the in-cell touch method and the mutual touch sensing method. In addition, the present invention has an effect of avoiding a saturation problem depending on the size of a capacitor of a touch sensor by performing touch detection while implementing a low power mode.

1 is a block diagram schematically showing a configuration of a display device according to a first embodiment of the present invention;
FIG. 2 is an exemplary view schematically showing a touch sensor of a touch screen; FIG.
3 is an exemplary view showing a touch screen made up of common electrodes;
4 is a waveform diagram for explaining an in-cell touch type time division driving technique.
5 is a diagram for explaining a low power consumption driving method of the display apparatus;
6 is a diagram for schematically explaining a sensing method proposed in the related art;
7 is a schematic view for explaining a sensing method according to the first embodiment of the present invention.
8 is a flowchart for explaining a method of driving a display device according to the first embodiment of the present invention.
Fig. 9 is a diagram showing an example of the configuration of an apparatus embodying the first embodiment of the present invention. Fig.
10 is an exemplary diagram showing the operation characteristics of an outline line in the knock-on mode;
Fig. 11 is a driving example of the first line shown in Fig. 9; Fig.
Fig. 12 is a driving example of the second line shown in Fig. 9; Fig.
Fig. 13 is a driving example of the third line shown in Fig. 9; Fig.
FIG. 14 is a diagram illustrating a configuration example of a touch sensor for block-based sensing when operating in a sleep mode according to a second embodiment of the present invention; FIG.
Fig. 15 is an illustration of an area where a block is sensed in block sensing in Fig. 14; Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

An electronic device having a touch sensor according to the present invention is implemented as a television, a set-top box, a navigation device, a video player, a Blu-ray player, a personal computer (PC), a home theater and a mobile phone.

An electronic device having a touch sensor according to the present invention is implemented based on a display panel as an example. The display panel may be a flat panel display panel such as a liquid crystal display panel, an organic light emitting display panel, an electrophoretic display panel, or a plasma display panel, but is not limited thereto. However, in the following description, a liquid crystal display panel will be described as an example for convenience of explanation.

≪ Embodiment 1 >

FIG. 1 is a block diagram schematically showing a configuration of a display device according to a first embodiment of the present invention. FIG. 2 is an exemplary view schematically showing a touch sensor of a touch screen. FIG. 4 is a waveform diagram for explaining the time division driving technique of the in-cell touch method.

1, the display device according to the first embodiment of the present invention includes a timing controller 20, a data driving circuit 12, a scan driving circuit 14, a liquid crystal display panel DIS, a touch screen (not shown) TSP) and a touch-screen driving circuit 30 are included.

The timing controller 20 receives timing signals such as a vertical synchronizing signal Vsync, a horizontal synchronizing signal Hsync, a data enable signal DE and a main clock MCLK from a host system (not shown) (RGB), and controls the data driving circuit 12 and the scan driving circuit 14 based on the video data RGB.

The timing controller 20 generates a scan timing control signal based on a scan timing control signal such as a gate start pulse (GST), a gate shift clock, and a gate output enable (GOE) (14). The timing controller 20 generates a timing control signal based on a data timing control signal such as a source sampling clock (SSC), a polarity control signal (POL), and a source output enable (SOE) (12).

The data driving circuit 12 converts the digital video data RGB input from the timing controller 20 into an analog positive / negative gamma compensation voltage to generate a data voltage. The data driving circuit 12 supplies the data voltage through the data lines D1 to Dm.

The scan driving circuit 14 sequentially generates gate pulses (or scan pulses) synchronized with the data voltage. The scan driver circuit 14 supplies gate pulses through the gate lines G1 to Gn.

The liquid crystal display panel DIS displays an image based on the gate pulse supplied from the scan driving circuit 14 and the data voltage supplied from the data driving circuit 12. [ The liquid crystal display panel DIS includes a liquid crystal layer formed between two substrates. The liquid crystal 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 subpixels of the liquid crystal display panel DIS are defined by data lines (D1 to Dm, m is an integer of 2 or more) and gate lines (G1 to Gn, n is an integer of 2 or more). One subpixel includes a TFT (Thin Film Transistor) formed at the intersections of the data line and the gate line, a pixel electrode for charging the data voltage, a storage capacitor Cst connected to the pixel electrode for maintaining the voltage of the liquid crystal cell ) And the like.

A black matrix, a color filter, and the like are formed on the upper substrate of the liquid crystal display panel DIS. A thin film transistor, a pixel electrode, a common electrode, and the like are formed on a lower substrate of the liquid crystal display panel DIS. The liquid crystal display panel (DIS) can be implemented as a COT (Color Filter On TFT) structure. In this case, the black matrix and the color filter may be formed on the lower substrate of the liquid crystal 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 liquid crystal display panel DIS. On the upper substrate and the lower substrate of the liquid crystal display panel DIS, a polarizing plate is attached, and an alignment film for forming a pre-tilt angle of the liquid crystal is formed on the inner surface in contact with 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 liquid crystal display panel DIS. A backlight unit is disposed below the bottom surface of the lower polarizer plate of the liquid crystal display panel DIS. The backlight unit is implemented as an edge type or a direct type to provide light to the liquid crystal display panel DIS.

The touch screen driving circuit 30 senses the presence or absence of a touch using a touch screen TSP. The touch screen driving circuit 30 includes a driving circuit for generating a driving voltage for driving the touch sensor, and a sensing circuit for sensing the touch sensor and generating data for detecting presence / absence of touch and coordinate information. The driving circuit and the sensing circuit of the touch-screen driving circuit 30 may be formed in the form of an integrated circuit (IC) or may be divided into functions and separated.

The touch screen driving circuit 30 is formed on an external substrate connected to the liquid crystal display panel DIS. The touch screen driving circuit 30 is connected to the touch screen TSP through the sensing lines L1 to Li and i are positive integers. The touch screen driving circuit 30 senses the presence or absence of a touch based on the capacitance variation between the touch sensors formed on the touch screen TSP.

A capacitance variation occurs between a position where the user's finger is touched and a non-contact position. The touch screen driving circuit 30 senses the presence or absence of touch by sensing the capacitance. The touch screen drive circuit 30 generates touch data (HIDxy) with respect to the presence or absence of a touch and transmits it to a host system (not shown).

2, the touch screen TSP is embedded in the display area AA of the liquid crystal display panel DIS in an in-cell self touch (hereinafter referred to as self-touch) do. A touch screen (TSP) of the self-touch sensing type uses an electrode formed in a block (or point) shape by an electrode or the like formed inside the liquid crystal display panel DIS as a touch sensor.

"C1, C2, C3, C4" formed in the display area AA of the liquid crystal display panel DIS means a touch sensor (or touch sensor block), and "L1, L2, L3, L4" Sensing line. Hereinafter, an example in which the touch sensor is configured as a common electrode will be described.

3, a touch screen (TSP) of a self-touch sensing type includes M (M is an integer of 4 or more) sub-pixels (for example, 32 sub-pixels in the horizontal direction) formed in the liquid crystal display panel DIS * 32 sub-pixels in the vertical direction) constitute one touch sensor. That is, the touch sensors C1, C2, C3, and C4 are defined by the common electrodes COM formed separately on the liquid crystal display panel DIS.

As shown in FIGS. 1 to 3, the touch screen driving circuit 30 supplies the touch driving signal Tdrv through the sensing lines L1 to L4 connected to the touch screen TSP of the self-touch sensing type.

When the touch screen driving circuit 30 senses the touch screen TSP by the self touch sensing method, it senses the RC delay difference Δt between the touch state and the non-touch state through the sensing lines L1 to L4 And recognizes that a touch is made when the RC delay difference between adjacent touch sensors C1 to C4 becomes equal to or greater than the reference value.

4, the display device having a touch screen of the self-touch sensing type includes a display driving period Td for displaying an image on the liquid crystal display panel DIS and a touch screen driving period for sensing the touch screen TSP (Tt) is divided in time. That is, the display driving period Td and the touch screen driving period Tt are time-division driven.

The common voltage Vcom is supplied to the sensing lines L1 to L4 during the display driving period Td while the touch driving signal Tdrv is supplied during the touch screen TSP. The touch driving signal Tdrv is generated in the form of an AC signal. The synchronizing signal Tsync for time-dividing the display driving period Td and the touch screen driving period Tt may be generated from a timing controller, a host system, or the like.

In the above description, the touch screen driving circuit 30 senses the presence / absence and position of the touch of the touch screen (TSP) in the self-touch sensing mode. However, the touch screen driving circuit 30 may sense the presence or absence of the touch of the touch screen (TSP) and the position thereof by a mutual touch sensing method. In this case, on the liquid crystal display panel DIS, Tx lines for transmitting a touch driving signal and Rx lines for receiving a capacitance value variable by touch are formed.

FIG. 5 is a view for explaining a low power consumption driving method of the display apparatus, and FIG. 6 is a view for schematically explaining a sensing method proposed in the past.

As shown in Fig. 5 (a), the above-described display device enters a sleep mode (or a sleep mode) when the user is not using the apparatus. On the other hand, as shown in FIG. 5B, when the user touches X (X is an integer equal to or more than two) times as if the user knocks the screen of the liquid crystal display panel DIS, the display device wakes up from the sleep mode.

Hereinafter, the function of Fig. 5 will be referred to as " knock on ". As shown in Fig. 5, when the display device is not used, the knock-on can reduce the power consumption of the device in such a manner that the liquid crystal display panel is stopped. However, there is a need to continue research to reduce power consumption in the proposed sleep mode.

[Consideration on Sensing Methods Proposed in the Conventional Background]

As shown in FIG. 6, in the conventional self-touch sensing method, the size of the capacitor Cs of the touch sensor appears as a coupling type due to the adjacent gate line G1 and the data line D1.

In order to improve this, conventionally, a voltage equal to the modulation voltage of the touch driving signal supplied to the sensing line is formed and supplied to the gate line G1 and the data line D1, Can be significantly reduced.

When the self-touch sensing method is operated as in the conventional method, the capacitors of the touch sensor are reduced, and the influence of the finger capacitors is increased, thereby improving the sensitivity and insensitivity to noise. Accordingly, the constraint on the driving capability of the touch screen driving circuit is relaxed, so that the physical size of the circuit can be reduced.

However, in order to apply the conventional method to the knock-on function, an analog circuit for generating and buffering the modulation voltage of the touch driving signal is further needed. When an analog circuit is further added, the current consumption is increased and the current can be increased according to the load of the gate line and the data line.

For this reason, in the sleep mode operation for the knock-on function, it is difficult to satisfy the current specification only by using the conventional system, and a disadvantage that a large amount of resources are used additionally occurs.

However, when the conventional method is not used, the capacitors of the touch sensor are increased. Therefore, for normal operation, a method should be adopted to avoid the range limit, such as reducing the modulation voltage, limiting the number of integrations, or increasing the feedback capacitor (Cfb) of the touch screen driver circuit.

However, when the above example is used, there is a problem because it is a direction to reduce a signal-to-noise ratio (SNR). Also, using the above example, to solve the saturation problem due to the capacitors of very large (~ several hundred pF) touch sensors, the internal capacitors of the touch screen driver circuit must be increased to a similar range, which can be a feasibility issue .

[Concept of sensing method according to the embodiment]

FIG. 7 is a view for schematically explaining a sensing method according to the first embodiment of the present invention, and FIG. 8 is a flowchart for explaining a method of driving a display device according to the first embodiment of the present invention.

As shown in FIG. 7, the first embodiment of the present invention changes the electrode configuration of the touch sensors for the sleep mode operation for the knock-on function. Specifically, the common electrodes divided into blocks (or points) are connected line by line to sense the mutual capacitors Cm between the touch sensors in the sleep mode operation. That is, when entering the knock-on function, the common electrodes are changed from a block type to a bar type (or stripe type) touch sensor line.

For example, "Cm1" means a mutual capacitor between the first line Tx and the second line Rx, and "Cm2" means a mutual capacitor between the third line Tx and the second line Rx Quot; RX (n) " means a line formed between the first line and the second line, and "C PRX " means a parasitic capacitance value between the second line (RX line) and the ground.

When a drive voltage is applied to the Tx channel configured as above, the amount of charge transferred from the channel is determined by the amount of change of the mutual capacitor Cm and the Tx drive voltage. At this time, the driving voltage applied to the Tx channel may be generated in the form of a complementary excitation pulse of mutually inverted form such as a first driving voltage VEX and a second driving voltage VEXB, It does not. The compensated excitation pulse has a strong resistance to distortion of the signal such as noise.

A touch screen driver circuit (sensing circuit; ROIC) can sense a mutual capacitor (Cm) between touch sensors from "Vin "

Figure 112015093991876-pat00001

In the above equation,? Cm denotes a difference value between Cm1 and Cm2, Cm1 denotes a capacitor value formed in the touch sensor line of the first line, Cm2 denotes a capacitor value formed in the touch sensor line of the second line , C PRX denotes the parasitic capacitance value between the second line (Rx line) and the ground, and VE denotes the driving voltage.

According to the first embodiment of the present invention, the charge transferred to the input terminal ("-") of the touch screen drive circuit (sensing circuit; ROIC)) is determined by the capacitor dividing of the capacitor. And the amount of change of the mutual capacitor Cm is displayed as a touch value.

Therefore, when the sensing circuit is constructed, the output is determined by dividing the mutual capacitors and the parasitic capacitances (Caps of the Rx parasitic electrodes) in the touch screen, and only the feedback capacitors are present in the sensing circuit .

Therefore, the first embodiment of the present invention does not need to consider the saturation problem in the self-touch sensing, which occurs in the conventional method. In addition, the gain can be amplified to a detectable voltage (touch threshold) or higher by increasing the gain of the integrator and the number of integrations in order to increase the variation of the small mutual capacitor Cm as needed.

Therefore, the first embodiment of the present invention switches from the self-touch sensing method to the mutual touch sensing method when the apparatus enters the sleep mode operation for the knock-on function. The first embodiment of the present invention can reduce the power consumption while maintaining stability and reliability of driving while the display device having the touch sensor performs the knock-on function.

The reason for this is that the mutual touch sensing method amplifies only the amount of change of the mutual capacitor Cm, so that it can detect a desired level without a problem of output saturation. That is, the mutual touch sensing method does not cause the limitation of the output range (in other words, saturation of the output) even when the capacitors of the touch sensor increase as compared with the self-touch sensing method.

As shown in FIG. 8, the driving method of the display device according to the first embodiment of the present invention lowers power consumption while maintaining the stability and reliability of driving while performing the knock-on function.

According to the first embodiment of the present invention, in a normal driving state, an image is displayed and a touch driving is performed (S110). During the video display and the touch driving period (normal mode or non-sleep mode), the touch screen is sensed by the first touch sensing method. In the normal driving state, the presence or absence of the input is determined continuously (or periodically) (S120).

If there is an input (Y), image display and touch driving are performed in the same manner as before, and the touch screen is sensed by the first touch sensing method (S110). Otherwise, if there is no input (N), the display device enters the sleep mode (S130).

When the display apparatus goes into the sleep mode, the image is not displayed and the touch operation is performed unlike the previous case (S140). During the video image display and the touch driving period (sleep mode), the touch screen is sensed by the second touch sensing method. In the sleep mode, the presence or absence of knock-on is determined continuously (or periodically) (S150).

If no knock-on occurs (N), image display and touch driving are performed in the same manner as before, and the touch screen is sensed by the second touch sensing method (S140). On the other hand, when knock-on occurs (Y), the display device is released from the sleep mode (S160). That is, the sensing mode is switched depending on the presence or absence of knock-on.

When the display device is released from the sleep mode, the image is displayed and touched (S170). During the video display and the touch driving period (normal mode or non-sleep mode), the touch screen is sensed by the first touch sensing method.

The method of driving a display device according to the first embodiment of the present invention senses a touch screen by a first touch sensing method when the display device operates in a general driving state (normal mode or non-sleep mode). At this time, the first touch sensing method is selected as a self-touch sensing method.

Alternatively, when the display device operates in the sleep mode, the touch screen is sensed by a second touch sensing method different from the first touch sensing method. At this time, the second touch sensing method is selected by the mutual touch sensing method.

As described above with reference to FIG. 7, the mutual touch sensing method can reduce the power consumption while maintaining stability and reliability of driving compared to the self-touch sensing method while performing the knock-on function. Therefore, it is considered that such a remarkable effect can be obtained by merely changing the sensing method in accordance with the switching of the drive mode as shown in Fig.

Hereinafter, an example for facilitating understanding of the present invention will be described. In the following description, the change of the electrode configuration of the touch sensors and the change of the sensing method as the display device operates in the sleep mode will be described. Further, before the display device operates in the sleep mode,

FIG. 9 is a diagram showing an example of the configuration of an apparatus embodying the first embodiment of the present invention, FIG. 10 is an exemplary view showing operation characteristics of an outline in a knock-on mode, FIG. 12 is a driving example of the second line shown in FIG. 9, and FIG. 13 is a driving example of the third line shown in FIG.

As shown in FIG. 9, in the first embodiment of the present invention, when the display device operates in the sleep mode, the electrodes of the touch sensor configured in a block (or point) form are changed into bars.

For example, the electrodes (0, 32, 64, 256, and 288) of the touch sensor configured in the form of a block in the first line are all shorted by the first mux signal 1MUX and changed to a bar shape. In the second line, the electrodes (1 33, 65 ... 257, and 289) of the touch sensor configured in a block form are all shorted by the second mux signal (2 MUX) and changed into a bar shape.

In this manner, all of the third to Mux signals 32MUX to 32MUX located in the respective lines from the third line to the thirty-second line are short-circuited and changed to a bar form.

Although it is not shown that the electrodes of the touch sensor constructed in a block form are short-circuited by the first to third multiplex signals 32MUX to 32MUX to change into a bar shape, it is also possible to electrically connect the blocks in the horizontal direction Or a device capable of performing a corresponding function is formed.

Hereinafter, the electrodes (31, 63, 95 ... 587, 319) of the touch sensor of the first line touch sensor (0, 32, 64 ... 256, 288) It is called touch sensor (1 group).

The first group touch sensor 1Group to the 32nd group touch sensor 32Group are connected to the MUXs one by one. The MUXs are configured as one input / output channel and 10 input / output channels as in the case of 10: 1, but the present invention is not limited thereto.

The MUXs are included in the touch-screen driving circuit 30. The MUXs are connected to a sensing circuit and a driving circuit (Sensing Block & Tx Buffer) included in the touch screen driving circuit 30.

MUXs are driven in a time-division manner and selectively control the channels electrically connected to the sensing circuit and the driving circuit (Sensing Block & Tx Buffer). The MUXs short at least one of the first group touch sensor 1Group to the 32nd group touch sensor 32Group corresponding to the first to Mux signal 32MUX to the first to Mux signal 32MUX.

When the display apparatus is operated in the sleep mode, the touch screen driving circuit 30 outputs the first to Mux signals 32MUX to 32MUX and shortens the blocks in the horizontal direction by 10 blocks One line is changed to a touch sensor group. That is, the touch screen drive circuit 30 changes the configuration of the electrodes of the touch screen.

When the display apparatus operates in the normal mode (or non-sleep mode), a total of 319 touch sensors exist in a block form, but when the display apparatus operates in the sleep mode, a total of 32 touch sensors are changed to exist in a line form . Meanwhile, the numbers of the touch sensor, the mux and the mux signal shown in the above description are only examples for helping understanding of the explanation.

When the display apparatus operates in the sleep mode, the touch screen driving circuit 30 changes the configuration of the electrodes of the touch screen and divides its channels into Tx channels and Rx channels. At this time, the touch screen driving circuit 30 can divide its channels into i (i is an integer of 2 or more) Tx channels and j (j is an integer of 2 or more) Rx channels.

For example, the sensing line connected to the first group touch sensor 1Group is changed to the Tx channel, the sensing line connected to the second group touch sensor 2Group is changed to the Rx channel, and the sensing line connected to the third line touch sensor 3Group The sensing line is changed to Tx channel.

When the display device operates in the sleep mode, the touch screen driving circuit 30 distinguishes its own channels and outputs the first driving voltage VEX and the second driving voltage VEXB through its Tx channels . At this time, the first driving voltage VEX and the second driving voltage VEXB may be generated in the form of complementary excitation pulses of mutually inverted form as described above, but are not limited thereto.

When the first group touch sensor 1Group and the third group touch sensor 3Group are operated with pulses having the same shape (or the same phase), the coupling capacities of the second group touch sensors 2Group are . In this case, the potential of the Rx channel is pulled up like a Tx channel. Therefore, the phase of the Tx channel located at both ends of the Rx channel is preferably inverted so that the output value of the Rx channel is not saturated.

When the display device operates in the sleep mode, the touch screen driving circuit 30 outputs a driving voltage through its Tx channels, receives a change amount of the mutual capacitors Cm1 and Cm2 through the Rx channels, .

If no knock-on occurs, the display device performs image display and touch driving (mutual touch sensing) in the same manner as before. When knock-on occurs, the display device is released from the sleep mode and performs video display and touch driving (self-touch sensing) unlike the previous case.

In the above description, it is difficult for the touch screen driver circuit 30 to incorporate a sensing circuit as many as the number of capacitors of the touch sensor electrode. Since the MUXs located at the input terminal of the touch screen driving circuit 30 repeatedly drive the channel, the problem that it is difficult to embed the sensing circuit as many as the number of capacitors of the touch sensor electrode is solved, thereby reducing the number of sensing circuits.

In addition, if there is no problem with the frame rate, the number of sensing circuits can be reduced by increasing the number of mux channels, thereby reducing the power consumption of the touch screen driving circuit 30. On the other hand, in the above description, N channels per one mux are controlled by a mux signal.

However, if the number of lines to be short-circuited (when the driving ability is excellent) or the number of lines to be short-circuited (when the driving ability is insufficient) depends on the ability of the touch screen driving circuit 30 to drive the capacitors of the electrodes of the touch sensor It is also possible to adjust the line that is shorted to the shape.

10, when the display device operates in the sleep mode, the touch screen driving circuit 30 switches the touch electrodes of the first group touch sensor 1Group to the 32nd group touch sensor 32Group, (U_Area) and the touch electrode (NU_Area) existing in the outline (or the outermost periphery) may not be used.

This is because, when the knock-on function is used, the user considers that the touch electrode existing in the outer edge (or the outermost edge) is not touched, and the power consumption can be reduced by not using the outer edge value. When the knock-on function is used, the touch screen drive circuit 30 does not use the touch electrode NU_Area existing in the outer (or outermost) area, and operates the Tx channel, the Rx channel, or the Tx and Rx channels included in this area .

On the other hand, there may be a characteristic deviation between the liquid crystal display panel and the touch screen drive circuit 30. [ When there is a characteristic deviation between the liquid crystal display panel and the touch screen driving circuit 30, a deviation occurs between the Rx channels. Therefore, the touch threshold value (value) for discriminating the presence or absence of touch should be set as a preliminary experiment value corresponding to the characteristics of the liquid crystal display panel.

When the display apparatus operates in the sleep mode, the touch screen driving circuit 30 can not use the internal algorithm, and thus can determine the presence or absence of the touch only by the absolute value output from the Rx channel. Thereafter, when the touch is determined, the timing controller outputs a signal for waking up the touch screen driving circuit 30 from the sleep mode.

9 shows an example in which the group of touch sensors are configured in the horizontal direction. However, this is only an example, and the touch sensors may be configured as a group touch sensor in the horizontal direction or the vertical direction depending on the model of the display device.

According to the first embodiment of the present invention, when the display device operates in the sleep mode, the touch screen driving circuit 30 performs mutual touch sensing on a line-by-line basis as follows. Hereinafter, it is assumed that the display apparatus is in the sleep mode.

11, the mux selection unit 36 of the touch screen driving circuit 30 switches the ten electrodes to short to select the block type touch sensors located on the first line (Line 1) of the touch screen, (Select 1 to 10 = All High). Accordingly, the block type touch sensors (0, 32, 64, 256, 288) located on the first line (Line 1) are changed to one first group touch sensor (1 Group).

The driving circuit 32 of the touch screen driving circuit 30 outputs the first driving voltage through the first group touch sensor 1Group. That is, the first group touch sensor 1Group is connected to the Tx channel. The sensing circuit 34 of the touch screen driving circuit 30 may be turned off while the driving circuit 32 of the touch screen driving circuit 30 outputs the first driving voltage.

12, the mux selection unit 36 of the touch screen driving circuit 30 switches the ten electrodes to short to select the block-shaped touch sensors located on the second line (Line 2) of the touch screen, (Select 1 to 10 = All High). As a result, the block type touch sensors 1, 33, 65 ... 257, and 289 located on the second line (Line 2) are changed to one second group touch sensor 2Group.

The sensing circuit 34 of the touch screen drive circuit 30 senses the amount of change of the mutual capacitors through the second group touch sensor 2Group. That is, the second group touch sensor 2Group is connected to the Rx channel. The driving circuit 34 of the touch screen driving circuit 30 can be turned off while the sensing circuit 32 of the touch screen driving circuit 30 senses the change amount of the mutual capacitors.

13, the mux selection unit 36 of the touch screen driving circuit 30 switches the ten electrodes to short to select the block type touch sensors located on the third line (Line 3) of the touch screen, (Select 1 to 10 = All High). As a result, the block type touch sensors 2, 34, 66 ... 258, and 290 located on the third line (Line 3) are changed to one third group touch sensor (3Group).

The driving circuit 32 of the touch screen driving circuit 30 outputs the second driving voltage through the third group touch sensor 3Group. That is, the third group touch sensor (3Group) is connected to the Tx channel. The sensing circuit 34 of the touch screen driving circuit 30 may be turned off while the driving circuit 32 of the touch screen driving circuit 30 outputs the second driving voltage.

The touch screen driving circuit 30 outputs a driving voltage to a group of one line in the manner as described above, senses a change amount of the mutual capacitors through a group of the next line, senses the touch screen line by line, Can be distinguished.

When the display apparatus is operated in the sleep mode, the touch screen driving circuit 30 may determine whether or not the touch is detected, rather than detecting coordinates according to the touch. Therefore, if a sensing method capable of discriminating only the presence or absence of knock-on in the sleep mode as in the first embodiment of the present invention is adopted, the power consumption can be reduced.

If the display device is implemented as in the first embodiment of the present invention, even if only the inverter buffer (32) for generating the driving voltage (Tx excitation) is further included in the touch screen driving circuit 30, The change amount of the mutual capacitors can be detected without addition.

In addition, when the display device is implemented as in the first embodiment of the present invention, the consumption current can be reduced without using the conventional technique. The mux existing in the touch screen driving circuit 30 can be used as it is. When the electrode of the touch sensor is short-circuited by the mux and the sensing circuit is difficult to drive, it is possible to determine the number of lines to be short-circuited by determining the capacity (proper cap size) of the capacitor to be sensed through appropriate control.

In addition, as in the first embodiment of the present invention, the display device uses a mutual touch sensing method in which a dynamic range is wider and a capacitance of a capacitor is very small as compared with a self-touch sensing method in a sleep mode operation. Therefore, it is not necessary to add a circuit for improving the signal-to-noise ratio (SNR) according to the increase of driving voltage modulation, reducing the feedback capacitor size and charging charge removal.

Hereinafter, a second embodiment of the present invention will be described.

≪ Embodiment 2 >

FIG. 14 is a diagram illustrating a configuration of a touch sensor for block-based sensing according to a second embodiment of the present invention, and FIG. 15 is a diagram illustrating an example of a region shot in block-based sensing of FIG.

In the above description, when the display apparatus operates in the sleep mode, the touch screen driving circuit 30 senses the touch screen line by line and then senses whether the knock is on or off.

However, when the display device operates in a specific mode (for example, a sleep mode, an image non-display mode, or the like) as shown in FIG. 14, the touch screen driving circuit 30 is operated in the horizontal direction (N is an integer equal to or greater than 2) can be short-circuited (nMUX). At this time, the touch screen driving circuit 30 can perform block-based sensing.

The second embodiment of the present invention is implemented such that the display device operates in a specific mode and performs sensing on a block-by-block basis only in a specific area. As shown in FIG. 15, when the display device of the smart phone SMT operates in a specific mode, N (N) is applied to the horizontal direction of the touch screen so that the central area CA of the display surface AA can be sensed in units of blocks. (N is an integer of two or more) can be shorted (nMUX).

However, this is only an example, and the area that can be sensed on a block-by-block basis may be changed by a user or the like. According to the second embodiment of the present invention, all the electrodes of the touch screen as well as the line unit or the block unit can be short-circuited and then the entire sensing can be performed.

In the embodiments of the present invention, the display device operates in the sleep mode as an example. However, this is only an example, and the present invention may be applied to a mode of switching the sensing method when the display device operates in a specific mode. For this purpose, various types of sensing can be performed by selectively shorting the electrodes of the touch screen.

For example, the present invention can use mutual sensing using Tx channel / Rx channel by bundling N muxes, and each line can also be used as a self sensing mode. In addition, it is possible to use mutual sensing by using a Tx channel / Rx channel as a unit block (for example, a square or a rectangular shape), and to use each block as a unit sensor in a self-sensing mode. Also, it is possible to extend the touch sensor by combining all the sensors with a single touch sensor so as to discriminate the touch by a self-sensing method.

As described above, the present invention has the effect of reducing the power consumption while maintaining the stability and reliability of the driving while the electronic device having the touch sensor performs a specific mode (e.g., sleep mode). In addition, the present invention has an effect that the electronic device having the touch sensor can switch the sensing method such as the in-cell touch method and the mutual touch sensing method. In addition, the present invention has an effect of avoiding a saturation problem depending on the size of a capacitor of a touch sensor by performing touch detection while implementing a low power mode.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. In addition, the scope of the present invention is indicated by the following claims rather than the detailed description. Also, all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

20: timing controller 12: data driving circuit
14: scan drive circuit DIS: liquid crystal display panel
TSP: Touch screen 30: Touch screen drive circuit
MUXs: Mux 36: Mux Selection

Claims (14)

Display panel;
A touch screen including electrodes positioned on the display panel; And
A touch sensor including a touch screen driving circuit for driving the touch screen, the touch screen driving circuit for switching the sensing mode to drive the touch screen by self-touch sensing or corresponding to a display mode of the display panel Electronic device. delete The method according to claim 1,
The touch screen driving circuit
The touch panel is driven by a self-touch sensing method when the display panel is in a normal mode in which an image is displayed,
And a touch sensor for driving the touch screen by a mutual touch sensing method when the display panel is in a sleep mode in which the image is not displayed. The method according to claim 1,
When the touch screen driving circuit drives the touch screen by the mutual touch sensing method,
Wherein the electrodes configured in block (or point) form on the touch screen have a touch sensor that is shorted by at least one line in a first direction of the touch screen. The method according to claim 1,
When the touch screen driving circuit drives the touch screen by the mutual touch sensing method,
Wherein the electrodes configured in the form of a block (or point) of the touch screen have a touch sensor that is shorted by one line with respect to the first direction of the touch screen and with N lines with respect to the first direction. Display panel;
A touch screen including electrodes positioned on the display panel; And
Wherein when the display mode of the display panel is changed,
Wherein the touch sensor controls the electrodes configured in the block (or point) form of the touch screen to be shorted by at least one line with respect to the first direction of the touch screen. Displaying an image on a display panel and driving a touch screen built in the display panel using a first touch sensing method;
Wherein the controller is configured to determine whether there is an input on the display panel and to enter a sleep mode when no input is present and to display the image on the display panel and to drive the touch screen by a second touch sensing method different from the first touch sensing method step; And
And when the knock-on operation for touching the display panel occurs, releasing the sleep mode and displaying an image on the display panel, and switching the sensing mode by the first touch sensing method in the second touch sensing method, And a driving method of the electronic device. 8. The method of claim 7,
The first touch sensing method is selected by a self-touch sensing method,
Wherein the second touch sensing method has a touch sensor selected by a mutual touch sensing method. 8. The method of claim 7,
When the touch screen is driven by the second touch sensing method,
Wherein the electrodes configured in the form of a block (or point) of the touch screen have a touch sensor that is shorted by one line with respect to the first direction of the touch screen and with N lines with respect to the first direction. The method according to claim 1,
The touch screen driving circuit
If the touch input is not present on the display panel, the sensing mode is switched by the mutual touch sensing method,
And a touch sensor for switching the sensing mode by the self-touch sensing method when a touch input is present on the display panel. The method according to claim 1,
The touch screen driving circuit
And a touch sensor that determines whether or not a touch is detected instead of coordinate detection according to a touch of the touch screen when the display panel operates in a sleep mode in which the image is not displayed. The method according to claim 1,
The touch screen driving circuit
A line is cut by one line in the first direction of the touch screen,
The N lines may be shot or shorted in the first direction of the touch screen
And a touch sensor for short-circuiting all the lines of the touch screen to determine whether the display panel is turned on or off. 8. The method of claim 7,
The step of driving the touch screen
A line is cut by one line in the first direction of the touch screen,
The N lines may be shot or shorted in the first direction of the touch screen
And a touch sensor for short-circuiting all the lines of the touch screen to determine whether or not knock-on of the display panel has occurred. 8. The method of claim 7,
The step of driving the touch screen
Wherein when the display panel operates in the sleep mode in which the display panel does not display an image, only the presence or absence of a touch is detected instead of the coordinate detection according to the touch of the touch screen.
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