Touch sensor device and display device

Abstract

The invention relates to a touch sensor device and a display device. The touch sensor device may include: a multiplexer including a first transistor connected to a first touch sensor and a second transistor connected to a second touch sensor; and a touch driver connected with the first touch sensor through the first transistor and connected with the second touch sensor through the second transistor, the first touch sensor being disposed at a first distance from the touch driver and the second touch sensor being disposed at a second distance from the touch driver. And the second touch sensor is disposed at a second distance from the touch driver that is shorter than the first distance. A first on-resistance of the first transistor may be less than a second on-resistance of the second transistor.

Description

Technical Field

[0001] Embodiments of the inventive concept relate to a touch sensor device and a display device including the same. More particularly, embodiments of the inventive concept relate to a touch sensor device capable of improving accuracy and consistency of a sensing voltage and a display device including the same. Background Art

[0002] Typically, a display device includes a display panel and a display panel driver. The display panel displays an image based on input image data. The display panel includes a plurality of gate lines, a plurality of data lines, and a plurality of pixels. The display panel driver may include: a gate driver that provides a gate signal to the gate line; a data driver that provides a data voltage to the data line; and a drive controller that controls the gate driver and the data driver.

[0003] The display device may include a touch sensor device. The touch sensor device may include a touch sensor and a touch driver driving the touch sensor. The sensing voltage of the touch sensor may be different depending on the distance between the touch sensor and the touch driver. Therefore, the sensing voltage applied to the touch driver may not be consistent. Summary of the invention

[0004] Embodiments of the inventive concept provide a touch sensor device in which the accuracy and consistency of a sensing signal (voltage or current) applied to a touch driver are improved.

[0005] Embodiments of the inventive concept also provide a display device including the touch sensor device.

[0006] In an embodiment of a touch sensor device according to the present invention, the touch sensor device may include: a multiplexer including a first transistor connected to a first touch sensor and a second transistor connected to a second touch sensor; and a touch driver connected to the first touch sensor through the first transistor and to the second touch sensor through the second transistor; the first touch sensor is arranged at a first distance from the touch driver, and the second touch sensor is arranged at a second distance from the touch driver that is shorter than the first distance. A first on-resistance of the first transistor may be smaller than a second on-resistance of the second transistor.

[0007] Among the various options:

[0008] A first control voltage may be applied to a control electrode of the first transistor. A second control voltage different from the first control voltage may be applied to a control electrode of the second transistor.

[0009] The first transistor and the second transistor may be P-type transistors.The first control voltage may be higher (in absolute value) than the second control voltage.

[0010] The first transistor and the second transistor may be N-type transistors. The first control voltage may be higher than the second control voltage.

[0011] The touch driver may include a digital-to-analog converter (DAC) configured to generate a first control voltage and a second control voltage. The DAC may include: a first power voltage terminal receiving a first power voltage; a second power voltage terminal receiving a second power voltage; a plurality of converter resistors connected between the first power voltage terminal and the second power voltage terminal; and a plurality of converter switches connected to the first power voltage terminal, the second power voltage terminal, and a node between the plurality of converter resistors.

[0012] The first transistor and the second transistor may be P-type transistors. The first power voltage may be higher (in absolute value) than the second power voltage. The DAC may generate a divided voltage using the first power voltage and the second power voltage. The DAC is configured to output a first divided voltage as a first control voltage and output a second divided voltage different from the first divided voltage as a second control voltage.

[0013] The first transistor and the second transistor may be N-type transistors. The first power voltage may be higher than the second power voltage. The DAC may generate a divided voltage using the first power voltage and the second power voltage. The DAC is configured to output the first divided voltage as a first control voltage and output a second divided voltage different from the first divided voltage as a second control voltage.

[0014] The touch sensor device may further include a fourth touch sensor disposed at a first distance from the touch driver and a fifth touch sensor disposed at a second distance from the touch driver. The multiplexer may further include a fourth transistor connected to the fourth touch sensor and a fifth transistor connected to the fifth touch sensor. The fourth transistor may have a first on-resistance, and the fifth transistor may have a second on-resistance.

[0015] A first control voltage may be applied to a control electrode of the first transistor and a control electrode of the fourth transistor. A second control voltage may be applied to a control electrode of the second transistor and a control electrode of the fifth transistor. The first control voltage and the second control voltage may be different from each other.

[0016] The touch sensor device may further include a third touch sensor disposed at a third distance from the touch driver that is shorter than the second distance. The multiplexer may further include a third transistor connected to the third touch sensor. A third on-resistance of the third transistor may be greater than the second on-resistance.

[0017] The touch driver may include a sensing circuit. The sensing circuit may include: an amplifier including a first input terminal receiving a reference voltage, a second input terminal receiving a sensing voltage, and an output terminal; a sensing resistor connected between the second input terminal and the output terminal; a sensing switch connected between the second input terminal and the output terminal; and a sensing capacitor connected between the second input terminal and the output terminal.

[0018] In a sensing period in which a sensing voltage may be applied to the touch driver, the first on-resistance may be smaller than the second on-resistance.

[0019] The touch driver may apply a driving signal to the first touch sensor and the second touch sensor through the multiplexer. The touch driver may receive a sensing voltage of the first touch sensor and a sensing voltage of the second touch sensor through the multiplexer.

[0020] In an embodiment of a display device according to the present invention, the display device may include: a display panel including a plurality of pixels; a display panel driver driving the display panel; a multiplexer including a first transistor connected to a first touch sensor and a second transistor connected to a second touch sensor; and a touch driver connected to the first touch sensor through the first transistor and to the second touch sensor through the second transistor, the first touch sensor being disposed at a first distance from the touch driver, and the second touch sensor being disposed at a second distance from the touch driver that is shorter than the first distance. A first on-resistance of the first transistor may be less than a second on-resistance of the second transistor.

[0021] In an embodiment, a touch sensor device may include: a multiplexer including a first transistor connected to a first touch sensor and a second transistor connected to a second touch sensor; and a touch driver configured to apply a first control signal to the first transistor to operate the first transistor having a first on-resistance, and apply a second control signal to the second transistor to operate the second transistor having a second on-resistance greater than the first on-resistance. The first touch sensor and the second touch sensor are respectively disposed at a first distance and a second distance from the touch driver, wherein the second distance is shorter than the first distance.

[0022] Therefore, in the embodiments of the touch sensor device and the display device summarized above, the transistor included in the multiplexer can have an on-resistance based on the distance. The touch driver can receive sensing data (e.g., sensing voltage or sensing current) based on the distance from the touch sensor. Therefore, the accuracy and consistency of the sensing data can be improved, which can improve the touch performance of the display panel even when the external environment (e.g., the temperature of the display panel, etc.) changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other features and advantages of the present inventive concept will become more apparent by describing in detail embodiments of the present inventive concept with reference to the accompanying drawings.

[0024] Figure 1A is a block diagram illustrating a display device according to an embodiment of the inventive concept.

[0025] Figure 1B is a conceptual cross-sectional view illustrating a display panel according to an embodiment of the inventive concept.

[0026] Figure 1C is a conceptual cross-sectional view illustrating a display panel according to another embodiment of the inventive concept.

[0027] Figure 2 It is shown Figure 1A A block diagram of a display panel, a driving controller, a gate driver, a gamma reference voltage generator, a data driver and a multiplexer of a display device of the present invention is provided.

[0028] Figure 3 It is shown Figure 1A Conceptual image of a display device.

[0029] Figure 4 It is shown Figure 3 Circuit / functional block diagram of a touch driver, multiplexer, and multiple touch sensors.

[0030] Figure 5 It is shown Figure 4 A circuit diagram of an example driver circuit.

[0031] Figure 6 It is shown Figure 4 2 is a circuit diagram of an example sensing circuit.

[0032] Figure 7 It is shown Figure 4 Circuit diagram of an example digital-to-analog converter.

[0033] Figure 8 It is shown Figure 4 A circuit diagram of a portion of a display device.

[0034] Fig. 9 It is shown Figure 4 A circuit diagram of a portion of a display device.

[0035] Fig.10 is a block diagram illustrating an electronic device according to an embodiment of the inventive concept.

[0036] Fig.11 It is shown Fig.10 The electronic device is implemented as a view of an example of a smart phone. DETAILED DESCRIPTION

[0037] Hereinafter, the inventive concept will be described in more detail with reference to the accompanying drawings.

[0038] Figure 1A is a block diagram illustrating a display device according to an embodiment of the inventive concept. Figure 1B is a conceptual cross-sectional view illustrating a display panel according to an embodiment of the inventive concept. Figure 1C is a conceptual cross-sectional view illustrating a display panel according to another embodiment of the inventive concept. Figure 2 It is shown Figure 1A A block diagram of a display panel, a driving controller, a gate driver, a gamma reference voltage generator, a data driver and a multiplexer of a display device.

[0039] Reference Figures 1A to 2 , the display device 10 includes a display panel 100 , a display panel driver 20 driving the display panel 100 , a touch panel 600 disposed on the display panel 100 , and a touch driver 700 driving the touch panel 600 .

[0040] The touch panel 600 includes a touch sensor DS. For example, the touch sensor DS may be a self dot sensor, such as a mutual capacitance touch sensor for a touch screen, where a "dot" represents a direct on-cell touch, and "on-cell" is a process in which the touch panel is embedded between a polarizer and a color filter substrate. When a self dot sensor is used as the touch sensor DS, a wider panel bandwidth can be achieved, and the effect of noise on the display panel 100 can be reduced. When the display device 10 is an automotive display device, it may be advantageous to implement the touch sensor DS as a self dot sensor. The automotive display device has a long resolution in one direction, so that it may be difficult to implement the touch sensor DS in a line form. The long resolution in one direction may mean that the display panel may include more pixels in one direction than in another direction. When the touch sensor DS is implemented in a line form in an automotive display device, the signal delay may increase, the panel bandwidth may not be wide enough, and the noise effect on the display panel 100 may increase.

[0041] exist Figure 1A In the example of FIG. 1 , the touch panel 600 may be disposed outside the display panel 100. Alternatively, the touch panel and the display panel may be integrally formed.

[0042] Reference Figure 1B, the display panel 100' (an example vertical structure of the display panel 100) may include a base substrate 110, a display layer 120 disposed on the base substrate 110, an encapsulation layer 130 disposed on the display layer 120, and a touch layer 140 disposed on the encapsulation layer 130. The display layer 120 may include a light emitting element. The touch layer 140 may include a touch sensor DS.

[0043] Reference Figure 1C , the display panel 100" (another example vertical structure of the display panel 100) may include a base substrate 110, a display layer 120 disposed on the base substrate 110, a touch layer 140 disposed on the display layer 120, and an encapsulation layer 130 disposed on the touch layer 140. The display layer 120 may include a light emitting element. In an embodiment, the touch layer 140 may correspond to the touch panel 600.

[0044] The plurality of touch sensors DS may be connected to the multiplexer MX. To drive the touch sensors DS in a time division driving (TDD) method, the multiplexer MX may select each touch sensor DS at a different corresponding time. The multiplexer MX may include a plurality of transistors connected to the plurality of touch sensors DS.

[0045] For example, the multiplexer MX (and its transistor) may be disposed in the peripheral area PA of the display panel 100. The transistor may be integrated in the peripheral area PA of the display panel 100. When the transistor is integrated in the peripheral area PA of the display panel 100, the disadvantage of mounting the pad may be overcome.

[0046] The touch driver 700 may apply a touch drive signal to the transistor of the multiplexer MX. The touch driver 700 may receive a sensing voltage of the touch sensor DS through the transistor. A period during which sensing data (e.g., a sensing voltage or a sensing current) is applied to / detected by the touch driver 700 may be referred to as a sensing period.

[0047] The display panel driver 20 may include a driving controller 200 , a gate driver 300 , a gamma reference voltage generator 400 , and a data driver 500 .

[0048] For example, the driving controller 200 and the data driver 500 may be integrally formed. For example, the driving controller 200, the gamma reference voltage generator 400 and the data driver 500 may be integrally formed. A driving module including at least the integrally formed driving controller 200 and the data driver 500 may be referred to as a timing controller embedded data driver (TED).

[0049] The display panel 100 has a display area AA in which an image is displayed and a peripheral area PA adjacent to the display area AA.

[0050] The display panel 100 includes a plurality of gate lines GL, a plurality of data lines DL, and a plurality of pixels P connected to the gate lines GL and the data lines DL. The gate lines GL may extend in a first direction D1, and the gate lines GL may be arranged spaced apart from each other in a second direction D2 intersecting the first direction D1. The data lines DL may extend in the second direction D2, and the data lines DL may be arranged spaced apart from each other in the first direction D1.

[0051] The driving controller 200 receives input image data IMG and input control signal CONT from an external device. The input image data IMG may include red image data, green image data, and blue image data. The input image data IMG may include white image data. The input image data IMG may include magenta image data, yellow image data, and cyan image data. The input control signal CONT may include a main clock signal, a data enable signal, a vertical synchronization signal, and a horizontal synchronization signal.

[0052] The driving controller 200 generates a first control signal CONT1 , a second control signal CONT2 , a third control signal CONT3 , and a data signal DATA based on input image data IMG and an input control signal CONT.

[0053] The driving controller 200 generates a first control signal CONT1 for controlling the operation of the gate driver 300 based on the input control signal CONT, and outputs the first control signal CONT1 to the gate driver 300. The first control signal CONT1 may include a vertical start signal and a gate clock signal.

[0054] The driving controller 200 generates a second control signal CONT2 for controlling the operation of the data driver 500 based on the input control signal CONT, and outputs the second control signal CONT2 to the data driver 500. The second control signal CONT2 may include a horizontal start signal and a load signal.

[0055] The driving controller 200 generates a data signal DATA based on the input image data IMG. The driving controller 200 outputs the data signal DATA to the data driver 500.

[0056] The driving controller 200 generates a third control signal CONT3 for controlling the operation of the gamma reference voltage generator 400 based on the input control signal CONT, and outputs the third control signal CONT3 to the gamma reference voltage generator 400 .

[0057] The gate driver 300 generates and outputs a gate signal for driving the gate line GL in response to the first control signal CONT1 received from the driving controller 200. The gate driver 300 may sequentially output the gate signal to the gate line GL. The gate driver 300 may be mounted on the peripheral area PA of the display panel 100. The gate driver 300 may be integrated in the peripheral area PA of the display panel 100.

[0058] The gamma reference voltage generator 400 generates a gamma reference voltage VGREF in response to the third control signal CONT3 received from the driving controller 200. The gamma reference voltage generator 400 provides the gamma reference voltage VGREF to the data driver 500. The gamma reference voltage VGREF has a value corresponding to a level of the data signal DATA.

[0059] The gamma reference voltage generator 400 may be provided in the driving controller 200 or the data driver 500 .

[0060] The data driver 500 receives the second control signal CONT2 and the data signal DATA from the driving controller 200, and receives the gamma reference voltage VGREF from the gamma reference voltage generator 400. The data driver 500 converts the data signal DATA into an analog data voltage using the gamma reference voltage VGREF. The data driver 500 outputs the data voltage to the data line DL.

[0061] Figure 3 It is shown Figure 1A Conceptual image of a display device.

[0062] Reference Figures 1A to 3 , the multiplexer MX may include a first multiplexer MX1 ​​and a second multiplexer MX2, respectively. A first group GP1 of touch sensors DS in the touch panel 600 may be connected to the first multiplexer MX1, and a second group GP2 of touch sensors DS in the touch panel 600 may be connected to the second multiplexer MX2.

[0063] The driving controller 200 and the touch driver 700 may be disposed on a printed circuit board PCB.

[0064] The touch driver 700 may be connected to the first multiplexer MX1 ​​and the second multiplexer MX2; output a touch drive signal to the touch sensor DS; and receive a sensing voltage from the touch sensor DS. Figure 3 The embodiment includes two multiplexers MX1 and MX2, but other embodiments may have only one multiplexer, or at least three multiplexers.

[0065] like Figure 3As shown in , the data driver 500 may be formed of a chip-on-film (COF) structure. For example, the first chip-on-film unit COF1 may output a data voltage to a first region of the display panel 100, the second chip-on-film unit COF2 may output a data voltage to a second region of the display panel 100, the third chip-on-film unit COF3 may output a data voltage to a third region of the display panel 100, and the fourth chip-on-film unit COF4 may output a data voltage to a fourth region of the display panel 100.

[0066] Figure 4 It is shown Figure 3 Circuit / functional block diagram of a touch driver, multiplexer, and multiple touch sensors.

[0067] Reference Figure 4 , the touch driver 700 may include a driving circuit 710, a sensing circuit 720, and a digital-to-analog converter (DAC) 730. The multiplexer MX may be connected to the driving circuit 710, the sensing circuit 720, and the DAC 730. In addition, the multiplexer MX may be connected to the touch sensors DS1 to DSN. The multiplexer MX may include a first transistor TR1 receiving a first control voltage VG1, a second transistor TR2 receiving a second control voltage VG2, a third transistor TR3 receiving a third control voltage VG3, to an Nth transistor TRN receiving an Nth control voltage VGN, where N is a positive integer. The first transistor TR1 may be connected to the first touch sensor DS1, the second transistor TR2 may be connected to the second touch sensor DS2, the third transistor TR3 may be connected to the third touch sensor DS3, and the Nth transistor TRN may be connected to the Nth touch sensor DSN.

[0068] In some embodiments, the first control voltage VG1, the second control voltage VG2, and the third control voltage VG3 to the Nth control voltage VGN may be different. In other embodiments, some of the control voltages VG1 to VGN may be the same, and the others may be different from each other.

[0069] The first touch sensor DS1 may be disposed in the first area DSA1. The first area DSA1 may be disposed at a first distance DSD1 from the touch driver 700. The second touch sensor DS2 may be disposed in the second area DSA2, and the second area DSA2 is disposed at a second distance DSD2 from the touch driver 700. The second distance DSD2 may be shorter than the first distance DSD1. The third touch sensor DS3 may be disposed in the third area DSA3, and the third area DSA3 is disposed at a third distance DSD3 from the touch driver 700. The third distance DSD3 may be shorter than the second distance DSD2. The Nth touch sensor DSN may be disposed in the Nth area DSAN, and the Nth area DSAN is disposed at an Nth distance DSDN from the touch driver 700. The Nth distance DSDN may be shorter than the third distance DSD3.

[0070] The first control voltage VG1, the second control voltage VG2 and the third control voltage VG3 to the Nth control voltage may be different from each other so that the first on-resistance of the first transistor TR1, the second on-resistance of the second transistor TR2 and the third on-resistance of the third transistor TR3 to the Nth on-resistance of the Nth transistor TRN may be different.

[0071] Generally, the on-resistance of a transistor may refer to the resistance when the transistor is biased to have an on-state.

[0072] exist Figure 4 In the example of , the first on-resistance can be less than the second on-resistance. The second on-resistance can be less than the third on-resistance. The third on-resistance can be less than the Nth on-resistance. This is because, when the absolute value of the control voltage (gate-source voltage) (VGi) (i=any positive integer from 1 to N) is relatively high, this produces a higher drain-source current, and accordingly, the on-resistance of the transistor is relatively low. Setting the control voltage and on-resistance in this way can compensate for the higher wiring losses between the multiplexer MX and the touch sensor DS farther away (e.g., in the first area DSA1) compared to the closer touch sensor DS (e.g., in the Nth area DSAN).

[0073] In a conventional touch sensor device, the same control voltage can be applied to a conventional multiplexer regardless of the distance from the conventional touch driver. Therefore, the accuracy of the sensing data (e.g., sensing voltage or sensing current) of the conventional touch sensor device may be inaccurate. This is because there may be higher wiring loss for a touch sensor that is relatively far from the multiplexer. Due to the higher wiring loss, the same touch effect (e.g., change in capacitance during a touch event) at a farther touch sensor causes less detectable change in the sensing data signal (current or voltage) on the receiving side. In contrast, the touch driver 700 according to the inventive concept can apply different control voltages to the multiplexer MX according to the distance between the touch sensor (DSi) (i=1 to any positive integer in N) in the corresponding area (DSAi) and the touch driver 700. Therefore, the transistors TR1, TR2, TR3 to TRN included in the multiplexer MX may have an on-resistance based on the distance. For example, when the distance between the touch sensor DS and the touch driver 700 is long, the on-resistance may be relatively small. Conversely, when the distance between the touch sensor DS and the touch driver 700 is short, the on-resistance may be relatively high. Therefore, the touch driver 700 can receive the sensing data (e.g., sensing voltage) at a level based on the distance from the touch sensors DS1 to DSN. Therefore, the accuracy and consistency of the sensing data can be improved. Therefore, even when the external environment (e.g., the temperature of the display panel, etc.) changes, the touch performance of the display panel can be improved.

[0074] Figure 5 It is shown Figure 4 A circuit diagram of an example driver circuit. Figure 6 It is shown Figure 4 2 is a circuit diagram of an example sensing circuit. Figure 7 It is shown Figure 4 An example circuit diagram of a digital-to-analog converter (DAC).

[0075] Reference Figures 4 to 7 The driving circuit 710 may output the driving signal DRS to the multiplexer MX in response to the driving control signal DRV. For example, the driving circuit 710 may include a first driving transistor DTR1, a second driving transistor DTR2, and a driving output switching element OSW.

[0076] The first drive transistor DTR1 may include a control electrode (e.g., a gate electrode) receiving a drive control signal DRV, a first electrode (e.g., a drain electrode) receiving a high power voltage VDD, and a second electrode (e.g., a source electrode) connected to a drive signal output node NO. The second drive transistor DTR2 may include a control electrode receiving a drive control signal DRV, a first electrode connected to a drive signal output node NO, and a second electrode receiving a low power voltage VSS. The drive output switch element OSW may include a first terminal connected to the drive signal output node NO and a second terminal connected to the multiplexer MX. The drive output switch element OSW may output a drive signal DRS in response to a drive circuit control signal DCC. The drive signal DRS may be a voltage of the drive signal output node NO. However, the inventive concept is not limited to the structure of the drive circuit 710.

[0077] For example, the sensing circuit 720 may include an amplifier AS including a first input terminal receiving a reference voltage VREF, a second input terminal and an output terminal, a sensing resistor RS connected between the second input terminal and the output terminal, a sensing switch SWS connected to the second input terminal and the output terminal, and a sensing capacitor CS connected to the second input terminal and the output terminal.

[0078] The sensing resistor RS, the sensing switch SWS, and the sensing capacitor CS may be connected in parallel between the second input terminal and the output terminal.

[0079] The sensing circuit 720 can receive the sensing voltage VSEN of the touch sensors DS1 to DSN through the multiplexer MX at the second input terminal. It should be noted that in other embodiments, other sensing circuit structures can replace Figure 6 The sensing circuit structure of the sensing circuit 720.

[0080] like Figure 7 As shown in FIG. 7 , the DAC 730 may include a high power voltage terminal receiving a first power voltage VH having a high level, a low power voltage terminal receiving a second power voltage VL having a low level, and a resistor R1, R2, R3, . . . , RM-1, RM connected between the high power voltage terminal and the low power voltage terminal (wherein, generally, M is a natural number of 2 or more, and (M+1) may be equal to Figure 4DAC 730 may further include a switch SW1 connected to a high power voltage terminal, a switch SWM+1 connected to a low power voltage terminal, and a plurality of switches SW2, SW3, ..., SWM connected between resistors R1, R2, R3, ..., RM-1 and RM of the resistor string. DAC 730 may output a first divided voltage to an Nth divided voltage between a power voltage having a high level and a power voltage having a low level in response to the on-state of switches SW1, SW2, SW3, ..., SWM. The first divided voltage to the Nth divided voltage may be a control voltage (e.g., control voltages VG1, VG2, VG3, ..., VGN). For example, the first divided voltage may be a first control voltage VG1; the second divided voltage may be a second control voltage VG2; the third divided voltage may be a third control voltage VG3; and the Nth divided voltage may be an Nth control voltage VGN.

[0081] Figure 8 It is shown Figure 4 A circuit diagram of a portion of a display device. Figure 8 The display device 10' is Figure 4 An embodiment of a display device 10.

[0082] For ease of explanation, Figure 8 Six touch sensors DS1 to DS6 are shown. Figure 8 , the first control voltage VG1 is applied to the first touch sensor DS1 and the fourth touch sensor DS4 , the second control voltage VG2 is applied to the second touch sensor DS2 and the fifth touch sensor DS5 , and the third control voltage VG3 is applied to the third touch sensor DS3 and the sixth touch sensor DS6 .

[0083] Reference Figure 4 and Figure 8, the display device 10' may include first to sixth touch sensors DS1 to DS6 and first to sixth transistors TRP1 to TRP6 corresponding to and connected to the first to sixth touch sensors DS1 to DS6. The first touch sensor DS1 and the fourth touch sensor DS4 may be disposed in the first area DSA1 and may be approximately equidistant from the multiplexer MX. The second touch sensor DS2 and the fifth touch sensor DS5 may be disposed in the second area DSA2 and may be approximately equidistant from the multiplexer MX. The third touch sensor DS1 and the sixth touch sensor DS6 may be disposed in the third area DSA3 and may be approximately equidistant from the multiplexer MX. The first control voltage VG1 may be applied to the control electrode of the first transistor TRP1 and the control electrode of the fourth transistor TRP4. The second control voltage VG2 may be applied to the control electrode of the second transistor TRP2 and the control electrode of the fifth transistor TRP5. The third control voltage VG3 may be applied to the control electrode of the third transistor TRP3 and the control electrode of the sixth transistor TRP6.

[0084] exist Figure 8 In the embodiment of the present invention, the first transistor TRP1 to the sixth transistor TRP6 may be P-type transistors (the circle at the gate of the transistors TRP1 to TRP6 indicates "P-type"), so that the disable levels of the first control voltage VG1, the second control voltage VG2, and the third control voltage VG3 may be high levels (e.g., zero volts or a positive gate-source voltage). In addition, in the present embodiment, the absolute value of the first control voltage VG1 may be higher than the absolute value of the second control voltage VG2. (When both the first control voltage VG1 and the second control voltage VG2 are negative, the first control voltage VG1 may be more negative than the second control voltage VG2 and thus have a higher absolute value of the voltage). The absolute value of the second control voltage VG2 may be higher than the absolute value of the third control voltage VG3. The first control voltage VG1 may be applied to the control electrodes of the transistors (e.g., the first transistor TRP1 and the fourth transistor TRP4) connected to the touch sensors (e.g., the first touch sensor DS1 and the fourth touch sensor DS4) disposed in the first area DSA1. Therefore, transistors (eg, first and fourth transistors TRP1 and TRP4 ) connected to the touch sensors (eg, first and fourth touch sensors DS1 and DS4 ) provided in the first region DSA1 may have a first on-resistance.

[0085] In addition, the second control voltage VG2 may be applied to control electrodes of transistors (e.g., second transistor TRP2 and fifth transistor TRP5) connected to the touch sensors (e.g., second touch sensor DS2 and fifth touch sensor DS5) disposed in the second area DSA2. Therefore, transistors (e.g., second transistor TRP2 and fifth transistor TRP5) connected to the touch sensors (e.g., second touch sensor DS2 and fifth touch sensor DS5) disposed in the second area DSA2 may have a second on-resistance.

[0086] In addition, the third control voltage VG3 may be applied to the control electrode of the transistor (e.g., the third transistor TRP3 and the sixth transistor TRP6) connected to the touch sensor (e.g., the third touch sensor DS3 and the sixth touch sensor DS6) disposed in the third area DSA3. The absolute value of the third control voltage VG3 may be lower than the absolute values ​​of the first control voltage VG1 and the second control voltage VG2. Therefore, the transistor (e.g., the third transistor TRP3 and the sixth transistor TRP6) connected to the touch sensor (e.g., the third touch sensor DS3 and the sixth touch sensor DS6) disposed in the third area DSA3 may have a third on-resistance. In the present embodiment, the first on-resistance may be lower than the second on-resistance, and the second on-resistance may be lower than the third on-resistance, as described above, so that the consistency and accuracy of the sensing voltage VSEN may be improved.

[0087] Figure 8 The connection relationship between the touch sensor and the transistor shown in FIG. 1 is an example, and the present inventive concept is not limited to Figure 8 The connection relationship between the touch sensor and the transistor is shown in FIG.

[0088] Fig. 9 It is shown Figure 4 A circuit diagram of a portion of a display device. Fig. 9 The display device 10" is Figure 4 Another embodiment of the display device 10 is shown.

[0089] Reference Figure 4 and Fig. 9, the display device 10" may include first to sixth touch sensors DS1 to DS6 and first to sixth transistors TRP1 to TRP6 corresponding to and connected to the first to sixth touch sensors DS1 to DS6. The first touch sensor DS1 and the fourth touch sensor DS4 may be disposed in the first area DSA1. The second touch sensor DS2 and the fifth touch sensor DS5 may be disposed in the second area DSA2. The third touch sensor DS1 and the sixth touch sensor DS6 may be disposed in the third area DSA3. The first control voltage VG1 may be applied to the control electrode of the first transistor TRN1 and the control electrode of the fourth transistor TRN4. The second control voltage VG2 may be applied to the control electrode of the second transistor TRN2 and the control electrode of the fifth transistor TRN5. The third control voltage VG3 may be applied to the control electrode of the third transistor TRN3 and the control electrode of the sixth transistor TRN6.

[0090] exist Fig. 9 In the embodiment of , the first transistor TRN1 to the sixth transistor TRN6 may be N-type transistors (indicated by the absence of a circle at the transistor gate), and thus the disable levels of the first control voltage VG1, the second control voltage VG2, and the third control voltage VG3 may be low levels (e.g., zero volts or a negative gate-source voltage). Fig. 9 In the present embodiment, the first control voltage VG1 may be higher than the second control voltage VG2. The second control voltage VG2 may be higher than the third control voltage VG3. The first control voltage VG1 may be applied to the control electrodes of the transistors (e.g., the first transistor TRN1 and the fourth transistor TRN4) connected to the touch sensors (e.g., the first touch sensor DS1 and the fourth touch sensor DS4) disposed in the first region DSA1. Therefore, the transistors (e.g., the first transistor TRN1 and the fourth transistor TRN4) connected to the touch sensors (e.g., the first touch sensor DS1 and the fourth touch sensor DS4) disposed in the first region DSA1 may have a first on-resistance.

[0091] In addition, the second control voltage VG2 may be applied to the control electrodes of the transistors (e.g., the second transistor TRN2 and the fifth transistor TRN5) connected to the touch sensors (e.g., the second touch sensor DS2 and the fifth touch sensor DS5) disposed in the second area DSA2. The second control voltage VG2 may be lower than the first control voltage VG1. The second control voltage VG2 may be higher than the third control voltage VG3. Therefore, the transistors (e.g., the second transistor TRN2 and the fifth transistor TRN5) connected to the touch sensors (e.g., the second touch sensor DS2 and the fifth touch sensor DS5) disposed in the second area DSA2 may have a second on-resistance.

[0092] In addition, the third control voltage VG3 may be applied to the control electrode of the transistor (e.g., the third transistor TRN3 and the sixth transistor TRN6) connected to the touch sensor (e.g., the third touch sensor DS3 and the sixth touch sensor DS6) disposed in the third area DSA3. Therefore, the transistor (e.g., the third transistor TRN3 and the sixth transistor TRN6) connected to the touch sensor (e.g., the third touch sensor DS3 and the sixth touch sensor DS6) disposed in the third area DSA3 may have a third on-resistance. In the present embodiment, the first on-resistance may be lower than the second on-resistance, and the second on-resistance may be lower than the third on-resistance, so that the consistency and accuracy of the sensing voltage VSEN may be improved.

[0093] Fig. 9 The connection relationship between the touch sensor and the transistor shown in FIG. 1 is an example, and the present inventive concept is not limited to Fig. 9 The connection relationship between the touch sensor and the transistor is shown in FIG.

[0094] Fig.10 is a block diagram illustrating an electronic device according to an embodiment of the inventive concept. Fig.11 It is shown Fig.10 A diagram of an example in which the electronic device is implemented as a smart phone.

[0095] Reference Fig.10 and Fig.11 , the electronic device 1000 may include a processor 1010, a memory device 1020, a storage device 1030, an input / output (I / O) device 1040, a power supply 1050, and a display device 1060. Here, the display device 1060 may be Figure 1A The display device 10. In addition, the electronic device 1000 may further include a plurality of ports for communicating with a video card, a sound card, a memory card, a universal serial bus (USB) device, other electronic devices, and the like.

[0096] According to Fig.11In the embodiment shown in , the electronic device 1000 can be implemented as a smart phone. However, the electronic device 1000 is not limited thereto. For example, the electronic device 1000 can be implemented as a cellular phone, a video phone, a smart tablet, a smart watch, a tablet personal computer (PC), a car navigation system, a computer monitor, a laptop computer, and a head mounted display (HMD) device, etc.

[0097] The processor 1010 may perform various computing functions or various tasks. The processor 1010 may be a microprocessor, a central processing unit (CPU), an application processor (AP), etc. The processor 1010 may be coupled to other components via an address bus, a control bus, a data bus, etc. In addition, the processor 1010 may be coupled to an expansion bus such as a peripheral component interconnect (PCI) bus.

[0098] The processor 1010 may output input image data IMG (see FIG. 1 ) and an input control signal CONT (see FIG. 1 ) to the driving controller 200 of FIG. 1 .

[0099] The memory device 1020 may store data used for the operation of the electronic device 1000. For example, the memory device 1020 may include at least one nonvolatile memory device (such as an erasable programmable read-only memory (EPROM) device, an electrically erasable programmable read-only memory (EEPROM) device, a flash memory device, a phase change random access memory (PRAM) device, a resistive random access memory (RRAM) device, a nano floating gate memory (NFGM) device, a polymer random access memory (PoRAM) device, a magnetic random access memory (MRAM) device, and a ferroelectric random access memory (FRAM) device, etc.) and / or at least one volatile memory device (such as a dynamic random access memory (DRAM) device, a static random access memory (SRAM) device, and a mobile DRAM device, etc.).

[0100] Examples of storage device 1030 may include solid state drive (SSD) devices, hard disk drive (HDD) devices, and CD-ROM devices, etc. Examples of I / O device 1040 may include input devices (such as keyboards, keypads, mouse devices, touch pads, and touch screens, etc.) and output devices (such as printers and speakers, etc.). In some embodiments, display device 1060 may be included in I / O device 1040. Power supply 1050 may provide power for operation of electronic device 1000. Display device 1060 may be coupled to other components via a bus or other communication link.

[0101] According to the touch sensor device and the display device including the touch sensor device described above, the touch driver may apply different control voltages to the multiplexer according to corresponding distances between the touch sensor (connected to the multiplexer) and the touch driver.

[0102] The foregoing is an illustration of the inventive concept and should not be construed as limiting the inventive concept. Although some embodiments of the inventive concept have been described, it will be readily appreciated by those skilled in the art that many modifications are possible in the embodiments without substantially departing from the novel teachings and advantages of the inventive concept. Therefore, all such modifications are intended to be included within the scope of the inventive concept as defined in the claims. In the claims, any means-plus-function clause is intended to cover structures described herein as performing the stated functions and equivalent structures. Therefore, it should be understood that the foregoing is an illustration of the inventive concept and should not be construed as being limited to the specific embodiments disclosed, and modifications to the disclosed embodiments and other embodiments are intended to be included within the scope of the appended claims and their equivalents.

Claims

1. A touch sensor device, wherein: The touch sensor device comprises: a multiplexer including a first transistor connected to the first touch sensor and a second transistor connected to the second touch sensor; and a touch driver connected to the first touch sensor through the first transistor and connected to the second touch sensor through the second transistor, in, The first touch sensor is arranged at a first distance from the touch driver. The second touch sensor is disposed at a second distance from the touch driver that is shorter than the first distance, and A first on-resistance of the first transistor is smaller than a second on-resistance of the second transistor.

2. The touch sensor device of claim 1 , wherein: The touch driver applies a first control voltage to a control electrode of the first transistor; The touch driver applies a second control voltage to a control electrode of the second transistor; and The first control voltage and the second control voltage are different from each other.

3. The touch sensor device according to claim 2, wherein: The first transistor and the second transistor are P-type transistors, and An absolute value of the first control voltage is higher than an absolute value of the second control voltage.

4. The touch sensor device according to claim 2, wherein: The first transistor and the second transistor are N-type transistors, and The first control voltage is higher than the second control voltage.

5. The touch sensor device according to claim 2, wherein: The touch driver includes a digital-to-analog converter configured to generate the first control voltage and the second control voltage. Wherein, the digital-to-analog converter comprises: A first power voltage terminal, receiving a first power voltage; a second power voltage terminal, receiving a second power voltage; a plurality of converter resistors connected between the first power voltage terminal and the second power voltage terminal; and A plurality of converter switches are connected to the first power voltage terminal, the second power voltage terminal, and nodes between the plurality of converter resistors.

6. The touch sensor device according to claim 5, wherein: The first transistor and the second transistor are P-type transistors, wherein: An absolute value of the first power voltage is higher than an absolute value of the second power voltage; the digital-to-analog converter generates a divided voltage by using the first power voltage and the second power voltage; and The digital-to-analog converter is configured to output a first divided voltage as the first control voltage, and to output a second divided voltage different from the first divided voltage as the second control voltage.

7. The touch sensor device of claim 5, wherein: The first transistor and the second transistor are N-type transistors; The first power voltage is higher than the second power voltage; the digital-to-analog converter generating a divided voltage by using the first power voltage and the second power voltage; and The digital-to-analog converter is configured to output a first divided voltage as the first control voltage, and to output a second divided voltage different from the first divided voltage as the second control voltage.

8. The touch sensor device according to claim 1, wherein: The touch sensor device further includes a third touch sensor disposed at a third distance from the touch driver that is shorter than the second distance, wherein the multiplexer further comprises a third transistor connected to the third touch sensor, and Wherein, a third on-resistance of the third transistor is greater than the second on-resistance.

9. The touch sensor device according to claim 1, wherein: The touch sensor device further includes a fourth touch sensor disposed at the first distance from the touch driver and a fifth touch sensor disposed at the second distance from the touch driver. The multiplexer further includes a fourth transistor connected to the fourth touch sensor and a fifth transistor connected to the fifth touch sensor, and The fourth transistor has the first on-resistance, and the fifth transistor has the second on-resistance.

10. The touch sensor device of claim 9, wherein: A first control voltage is applied to a control electrode of the first transistor and a control electrode of the fourth transistor; A second control voltage is applied to a control electrode of the second transistor and a control electrode of the fifth transistor; and The first control voltage and the second control voltage are different from each other.

11. The touch sensor device according to claim 1, wherein: The touch driver includes a sensing circuit, Wherein, the sensing circuit comprises: an amplifier including a first input terminal receiving a reference voltage, a second input terminal receiving a sense voltage, and an output terminal; a sensing resistor connected between the second input terminal and the output terminal; a sensing switch connected between the second input terminal and the output terminal; and A sensing capacitor is connected between the second input terminal and the output terminal.

12. The touch sensor device according to claim 11, wherein: In a sensing period in which the sensing voltage is applied to the touch driver, the first on-resistance is smaller than the second on-resistance.

13. The touch sensor device according to claim 1, wherein: The touch driver applies a driving signal to the first touch sensor and the second touch sensor through the multiplexer, and The touch driver receives the sensing voltage of the first touch sensor and the sensing voltage of the second touch sensor through the multiplexer.

14. A display device, wherein: The display device comprises: A display panel including a plurality of pixels; A display panel driver, driving the display panel; a multiplexer including a first transistor connected to the first touch sensor and a second transistor connected to the second touch sensor; and a touch driver connected to the first touch sensor through the first transistor and connected to the second touch sensor through the second transistor, in, The first touch sensor is arranged at a first distance from the touch driver. The second touch sensor is disposed at a second distance from the touch driver that is shorter than the first distance, and A first on-resistance of the first transistor is smaller than a second on-resistance of the second transistor.

15. The display device according to claim 14, wherein: A first control voltage is applied to a control electrode of the first transistor, wherein a second control voltage is applied to a control electrode of the second transistor, and The first control voltage and the second control voltage are different from each other.

16. The display device according to claim 15, wherein: The first transistor and the second transistor are P-type transistors, and The absolute value of the first control voltage is higher than the absolute value of the second control voltage.

17. The display device according to claim 15, wherein: The first transistor and the second transistor are N-type transistors, and Wherein, the first control voltage is higher than the second control voltage.

18. The display device according to claim 14, wherein: The display device further includes a third touch sensor disposed at a third distance from the touch driver that is shorter than the second distance, Wherein, the multiplexer further comprises a third transistor connected to the third touch sensor, and Wherein, a third on-resistance of the third transistor is greater than the second on-resistance.

19. The display device according to claim 18, wherein: A first control voltage is applied to a control electrode of the first transistor; A second control voltage is applied to a control electrode of the second transistor; A third control voltage is applied to a control electrode of the third transistor; and The first control voltage, the second control voltage, and the third control voltage are different from each other.

20. The display device according to claim 14, wherein: The display device further includes a fourth touch sensor disposed at the first distance from the touch driver and a fifth touch sensor disposed at the second distance from the touch driver. wherein the multiplexer further comprises a fourth transistor connected to the fourth touch sensor and a fifth transistor connected to the fifth touch sensor, and The fourth transistor has the first on-resistance, and the fifth transistor has the second on-resistance.

21. A touch sensor device, wherein: The touch sensor device comprises: a multiplexer including a first transistor connected to the first touch sensor and a second transistor connected to the second touch sensor; and a touch driver configured to apply a first control signal to the first transistor to operate the first transistor having a first on-resistance, and apply a second control signal to the second transistor to operate the second transistor having a second on-resistance greater than the first on-resistance, The first touch sensor and the second touch sensor are respectively arranged at a first distance and a second distance from the touch driver, and the second distance is shorter than the first distance.

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