Display device

Abstract

The display device of the present invention includes: a panel including a plurality of pixels and a first sensor and a second sensor overlapping the plurality of pixels; and a circuit board including a first sensing pad electrically connected to the first sensor, a second sensing pad electrically connected to the second sensor, and a data pad electrically connected to the plurality of pixels. The circuit board includes: a sensor driving unit; a first sensing line having one end connected to the first sensing pad and the other end connected to the sensor driving unit; a second sensing line having one end connected to the second sensing pad and the other end connected to the sensor driving unit; a data line having one end connected to the data pad; and a first decoupling capacitor between the sensor driving unit and a first location where the first sensing line and the data line overlap, the first decoupling capacitor and the first sensing line having a connection point.

Description

Technical Field

[0001] The present invention relates to a display device. Background Art

[0002] With the development of information technology, the importance of a display device as a connection medium between a user and information has attracted much attention. Accordingly, the use of display devices such as a liquid crystal display device, an organic light emitting display device, and a plasma display device is increasing.

[0003] According to the preferences of users, the display area of the display device has become larger and higher in resolution, and the non-display area and space are continuously decreasing. Accordingly, the internal circuit of the display device has become smaller and more densely packed. On the contrary, the signal transmission speed has become higher. Accordingly, interference between signals may become a problem. Summary of the Invention

[0004] The problem to be solved is to provide a display device that can prevent interference between signals between a sensor driving unit and a display driving unit with a minimum configuration.

[0005] A display device according to an embodiment of the present invention includes: a panel including a plurality of pixels and a first sensor and a second sensor overlapping the plurality of pixels; and a circuit board including a first sensing pad electrically connected to the first sensor, a second sensing pad electrically connected to the second sensor, and a data pad electrically connected to the plurality of pixels. The circuit board includes: a sensor driving unit; a first sensing line having one end connected to the first sensing pad and the other end connected to the sensor driving unit; a second sensing line having one end connected to the second sensing pad and the other end connected to the sensor driving unit; a data line having one end connected to the data pad; and a first decoupling capacitor having a contact point with the sensor driving unit at a first location where the first sensing line and the data line overlap.

[0006] It may be that the circuit board further includes: a second decoupling capacitor having a contact point with the first sensing line at the first location and the sensor driving unit.

[0007] It may be that a portion extending between the first location among the first sensing lines and the sensor driving unit, the first decoupling capacitor, and the second decoupling capacitor form a low pass filter.

[0008] It may be that the passband of the low pass filter corresponds to the frequency of the first sensing signal received by the sensor driving unit through the first sensing line, and the stopband of the low pass filter corresponds to the frequency of the data signal transmitted to the data pad through the data line.

[0009] It may be that the sensor driving unit includes: a sensing receiving unit connected to the other end of the first sensing line and receiving the first sensing signal through the first sensing line; and a sensing transmitting unit connected to the other end of the second sensing line and transmitting a second sensing signal through the second sensing line.

[0010] It may be that the first sensor and the second sensor form a mutual capacitance.

[0011] It may be that the sensing receiving unit includes: an operational amplifier, a first input terminal connected to the other end of the first sensing line, and a second input terminal connected to a reference power supply.

[0012] It may be that the sensing receiving unit further includes: an analog-to-digital converter connected to the output terminal of the operational amplifier.

[0013] It may be that the sensing receiving unit further includes: a capacitor and a switch connected in parallel between the first input terminal and the output terminal.

[0014] It may be that the second sensing line is not connected to any decoupling capacitor between the second location where the second sensing line and the data line overlap and the sensor driving unit.

[0015] It may be that the first pixel among the plurality of pixels includes: a first transistor, a first electrode electrically connected to the data pad, and a gate electrode electrically connected to the scanning line.

[0016] It may be that the first pixel further includes: a second transistor, a first electrode connected to a first power supply line, and a gate electrode connected to the second electrode of the first transistor; a storage capacitor, a first electrode connected to the first power supply line, and a second electrode connected to the gate electrode of the second transistor; and a light emitting diode, an anode connected to the second electrode of the second transistor, and a cathode connected to a second power supply line.

[0017] Alternatively, the circuit board may further include: a second decoupling capacitor, which is between the second location where the second sensing line and the data line overlap and the sensor driving unit, and the second decoupling capacitor has a connection point with the second sensing line.

[0018] Alternatively, the circuit board may further include: a third decoupling capacitor, which is between the first location and the sensor driving unit, and the third decoupling capacitor has a connection point with the first sensing line.

[0019] Alternatively, the circuit board may further include: a fourth decoupling capacitor, which is between the second location and the sensor driving unit, and the fourth decoupling capacitor has a connection point with the second sensing line.

[0020] Alternatively, the portion extending between the first location among the first sensing lines and the sensor driving unit, the first decoupling capacitor, and the third decoupling capacitor form a first low-pass filter.

[0021] Alternatively, the portion extending between the second location among the second sensing lines and the sensor driving unit, the second decoupling capacitor, and the fourth decoupling capacitor form a second low-pass filter.

[0022] Alternatively, the passband of the first low-pass filter corresponds to the frequency of the first sensing signal received by the sensor driving unit through the first sensing line, and the stopband of the first low-pass filter corresponds to the frequency of the data signal sent to the data pad through the data line.

[0023] Alternatively, the passband of the second low-pass filter corresponds to the frequency of the second sensing signal received by the sensor driving unit through the second sensing line, and the stopband of the second low-pass filter corresponds to the frequency of the data signal.

[0024] Alternatively, the sensor driving unit may include: a sensing receiving unit, including an operational amplifier whose first input terminal is connected to the other end of the first sensing line, and receiving a first sensing signal through the first sensing line; and a sensing transmitting unit, sending a driving signal to the second input terminal of the operational amplifier.

[0025] (Advantages of the Invention)

[0026] The display device according to the present invention can prevent interference between signals between the sensor driving unit and the display driving unit with a minimal configuration. Description of the Drawings

[0027] Figure 1 It is a diagram for explaining a display device according to an embodiment of the present invention.

[0028] Figure 2It is a diagram for explaining the pixels related to an embodiment of the present invention.

[0029] Figure 3 It is a diagram for explaining the driving method of the pixels related to an embodiment of the present invention.

[0030] Figure 4 It is a diagram for explaining the sensor driving unit related to an embodiment of the present invention.

[0031] Figure 5 and Figure 6 It is a diagram for explaining the decoupling capacitors related to the embodiments of the present invention.

[0032] Figure 7 It is a diagram for explaining the display device related to other embodiments of the present invention.

[0033] Figure 8 It is a diagram for explaining the sensor driving unit related to other embodiments of the present invention.

[0034] Figure 9 and Figure 10 It is a diagram for explaining the decoupling capacitors related to other embodiments of the present invention. Detailed Description of the Invention

[0035] Hereinafter, with reference to the accompanying drawings, the embodiments of the present invention will be described in detail so that those skilled in the art can easily implement them. The present invention can be implemented in various different forms and is not limited to the embodiments described herein.

[0036] To clearly explain the present invention, parts irrelevant to the description are omitted, and the same or similar components are given the same reference numerals throughout the specification. Therefore, the reference numerals explained previously can be used in other drawings.

[0037] In addition, the sizes and thicknesses of the illustrated components are arbitrarily shown for ease of explanation, and the present invention is not necessarily limited to the illustrated cases. In the drawings, the thicknesses are exaggerated to clearly show each layer and region.

[0038] Figure 1 It is a diagram for explaining the display device related to an embodiment of the present invention.

[0039] Referring to Figure 1 , a display device 1 related to an embodiment of the present invention includes a panel 10 and a driving circuit unit 20 for driving the panel 10.

[0040] For example, the panel 10 may include a display unit 110 for displaying an image and a sensor unit 120 for sensing touch, pressure, fingerprint, hovering, etc. For example, the panel 10 may include pixels PXL, a first sensor RX, and a second sensor TX that overlap with the pixels PXL. The driving circuit unit 20 may include a display driving unit 210 for driving the display unit 110 and a sensor driving unit 220 for driving the sensor unit 120.

[0041] According to an embodiment, the display unit 110 and the sensor unit 120 may be configured and / or combined such that at least one region overlaps with each other after being separately manufactured. Alternatively, in other embodiments, the display unit 110 and the sensor unit 120 may be manufactured integrally. For example, the sensor unit 120 may be directly formed on at least one substrate constituting the display unit 110 (as an example, the upper and / or lower substrate of the panel, or a Thin Film Encapsulation layer), or other insulating layers or various functional films (as an example, an optical layer or a protective layer) other than this.

[0042] On the other hand, in Figure 1 it is shown that the sensor unit 120 is disposed on the front surface (e.g., the upper surface of the displayed image) side of the display unit 110, but the position of the sensor unit 120 is not limited thereto. For example, in other embodiments, the sensor unit 120 may also be disposed on the back surface or both surfaces of the display unit 110. In yet another embodiment, the sensor unit 120 may also be disposed in a region at at least one side edge position of the display unit 110.

[0043] The display unit 110 may include a display substrate 111 and a plurality of pixels PXL formed on the display substrate 111. The pixels PXL may be disposed in the display area DA of the display substrate 111.

[0044] The display substrate 111 may include a display area DA for displaying an image and a non-display area NDA disposed around the display area DA. According to an embodiment, the display area DA may be disposed in the central area of the display unit 110, and the non-display area NDA may be disposed in the edge position area of the display unit 110 to surround the display area DA.

[0045] The display substrate 111 may be a rigid substrate or a flexible substrate, and there is no particular limitation on its material or physical properties. For example, the display substrate 111 may be a rigid substrate made of glass or tempered glass, or a flexible substrate made of a thin film of plastic or metal material.

[0046] A plurality of scan lines SL, a plurality of data lines DL, and a plurality of pixels PXL connected to the plurality of scan lines SL and the plurality of data lines DL are arranged in the display area DA. The pixel PXL can be selected according to a scan signal supplied from the scan line SL, thereby receiving the supply of a data signal from the data line DL and emitting light with a luminance corresponding to the data signal. Thereby, an image corresponding to the data signal is displayed in the display area DA. In the present invention, the structure and driving method of the pixel PXL are not particularly limited. For example, each pixel PXL can be implemented by pixels of various currently known structures and / or driving methods. In the following description, reference will be made to Figure 2 and Figure 3 to describe the structure of an exemplary pixel PXL.

[0047] In the non-display area NDA, various wirings and / or built-in circuit portions connected to the pixels PXL in the display area DA can be arranged. As an example, in the non-display area NDA, a plurality of wirings for supplying various power supplies and control signals to the display area DA can be arranged, and in addition, a scan driver and the like can be arranged.

[0048] In the present invention, the type of the display unit 110 is not particularly limited. For example, the display unit 110 can be implemented by a self-luminous display panel such as an Organic Light Emitting Display panel. Alternatively, the display unit 110 can be implemented by a non-luminous display panel such as a Liquid Crystal Display panel. When the display unit 110 is implemented by a non-luminous type, the display device 1 can further include a light source such as a Back-light Unit.

[0049] The sensor unit 120 includes a sensing substrate 121 and a plurality of sensors TX, RX formed on the sensing substrate 121. The sensors TX, RX can be arranged in a sensing area SA on the sensing substrate 121.

[0050] The sensing substrate 121 can include a sensing area SA for sensing touch inputs and the like and a peripheral area NSA surrounding the sensing area SA. According to an embodiment, the sensing area SA can be arranged to overlap at least one area of the display area DA. As an example, the sensing area SA can be set to an area corresponding to the display area DA (for example, an area overlapping the display area DA), and the peripheral area NSA can be set to an area corresponding to the non-display area NDA (for example, an area overlapping the non-display area NDA). In this case, when a touch input or the like is provided on the display area DA, the touch input can be detected by the sensor unit 120.

[0051] The sensing substrate 121 may be a rigid or flexible substrate, and may also be composed of at least one insulating film. In addition, the sensing substrate 121 may be a transparent or translucent light-transmissive substrate, but is not limited thereto. That is, in the present invention, the material and physical properties of the sensing substrate 121 are not particularly limited. For example, the sensing substrate 121 may be a rigid substrate made of glass or tempered glass, or a flexible substrate made of a plastic or metal film. In addition, according to an embodiment, at least one substrate constituting the display unit 110 (for example, the display substrate 111, the encapsulation substrate, and / or the thin film encapsulation layer), or at least one insulating film or functional film disposed inside and / or on the outer surface of the display unit 110 may be used as the sensing substrate 121.

[0052] The sensing area SA is set as an area that can respond to a touch input (i.e., the effective area of the sensor). To this end, sensors TX and RX for sensing a touch input or the like may be disposed in the sensing area SA. According to an embodiment, the sensors TX and RX may include a first sensor RX and a second sensor TX. For example, a plurality of first sensors RX belonging to the same group may be connected to the same first sensing line RXL. In addition, a plurality of second sensors TX belonging to the same group may be connected to the same second sensing line TXL. For example, in the sensing area SA, a plurality of first sensing lines RXL and a plurality of second sensing lines TXL may extend in a direction intersecting each other. For example, adjacent first sensors RX and second sensors TX may form a mutual capacitance.

[0053] According to an embodiment, each of the first sensor RX and the second sensor TX may include at least one of a metal substance, a transparent conductive substance, and various other conductive substances, and thus have conductivity. As an example, the first sensor RX and the second sensor TX may include at least one of various metal substances such as gold (Au), silver (Ag), aluminum (Al), molybdenum (Mo), chromium (Cr), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), platinum (Pt), or an alloy thereof. At this time, the first sensor RX and the second sensor TX may be configured in a mesh form. In addition, the first sensor RX and the second sensor TX may include, for example, silver nanowires (AgNW), ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), IGZO (Indium Gallium Zinc Oxide), AZO (Antimony Zinc Oxide), ITZO (Indium Tin Zinc Oxide), ZnO (Zinc Oxide), SnO2 (Tin Oxide, tin oxide), carbon nanotubes (Carbon Nano Tube), graphene (graphene), and at least one of various transparent conductive materials. In addition, the first sensor RX and the second sensor TX may also include at least one of various conductive materials to have conductivity. In addition, the first sensor RX and the second sensor TX may each be formed of a single layer or multiple layers, and their cross-sectional structures are not particularly limited.

[0054] When the first sensor RX (or the first sensing line RXL) and the second sensor TX (or the second sensing line TXL) cross each other, at least one layer of insulating film (or insulating pattern) or a spaced-apart space may be provided therebetween (especially at least the crossing portion).

[0055] Alternatively, in other embodiments, the first sensor RX (or the first sensing line RXL) and the second sensor TX (or the second sensing line TXL) may also be dispersed on the same layer of the sensing region SA so as not to cross each other. In this case, there is no need to dispose an interlayer insulating film between the first sensor RX and the second sensor TX, and the second sensor TX and the first sensor RX can be patterned simultaneously through a simple masking process. As described above, if the second sensor TX and the first sensor RX are disposed on the same layer, the masking process can be minimized to reduce the manufacturing cost of the touch sensor and the display device 1 including the same, and the thickness of the touch sensor and the display device 1 can also be minimized.

[0056] On the other hand, in the peripheral region NSA of the sensor unit 120, the sensing lines RXL, TXL for electrically connecting the sensors TX, RX to the sensor driving unit 220, etc. may be centrally disposed.

[0057] The driving circuit unit 20 may include a display driving unit 210 for driving the display unit 110 and a sensor driving unit 220 for driving the sensor unit 120. According to an embodiment, the display driving unit 210 and the sensor driving unit 220 may be constituted by independent ICs (integrated chips) or at least a part of them may be integrated together in one IC.

[0058] The display driving unit 210 is electrically connected to the display unit 110 to drive the pixel PXL. To this end, the display driving unit 210 may include a scan driving unit for supplying a scan signal to the scan line SL, a data driving unit for supplying a data signal to the data line DL, and a timing control unit for controlling the scan driving unit and the data driving unit. According to an embodiment, the scan driving unit, the data driving unit, and / or the timing control unit may be integrated inside one IC, but is not limited thereto. For example, as described above, the scan driving unit may also be separately mounted in the non-display area NDA.

[0059] The sensor driving unit 220 is electrically connected to the sensor unit 120 to drive the sensor unit 120. The sensor driving unit 220 may include an induction transmitting unit and an induction receiving unit. According to an embodiment, the induction transmitting unit and the induction receiving unit may be integrated inside one IC, but are not limited thereto.

[0060] Figure 2 It is a diagram for explaining a pixel according to an embodiment of the present invention.

[0061] Referring to Figure 2 , a circuit of one pixel PXLij among a plurality of pixels PXL is illustrated.

[0062] The gate electrode of the first transistor T1 may be connected to the i-th scan line SLi, the first electrode may be connected to the j-th data line DLj, and the second electrode may be connected to the second electrode of the storage capacitor Cst. The first transistor T1 may be named a scan transistor. The first electrode of the first transistor T1 may be electrically connected to a data pad described later through the data line DLj.

[0063] The gate electrode of the second transistor T2 may be connected to the second electrode of the first transistor T1, the first electrode may be connected to the first power supply line ELVDDL, and the second electrode may be connected to the anode of the light emitting diode LD. The second transistor T2 may be named a driving transistor.

[0064] The first electrode of the storage capacitor Cst may be connected to the first power supply line ELVDDL, and the second electrode may be connected to the gate electrode of the second transistor T2.

[0065] The anode of the light emitting diode LD may be connected to the second electrode of the second transistor T2, and the cathode may be connected to the second power supply line ELVSSL. During the light emission period of the light emitting diode LD, the first power supply voltage applied to the first power supply line ELVDDL may be greater than the second power supply voltage applied to the second power supply line ELVSSL.

[0066] Here, the case where the transistors T1 and T2 are P-type transistors is shown, but those skilled in the art may also invert the phase of the signal to use at least one transistor replaced with an N-type transistor.

[0067] Figure 3 It is a diagram for explaining a driving method of a pixel according to an embodiment of the present invention.

[0068] Data signals DATA(i-1)j, DATAij (for example, data voltages) corresponding to each pixel PXL may be sequentially applied to the j-th data line DLj.

[0069] First, a scan signal at a conductive level (low level) can be applied to the (i - 1)-th scan line SL(i - 1). At this time, the first transistor T1 of the pixel connected to the (i - 1)-th scan line SL(i - 1) and the j-th data line DLj is turned on, and the data signal DATA(i - 1)j applied to the data line DLj can be stored in the storage capacitor Cst of the corresponding pixel.

[0070] Then, a scan signal at a conductive level can be applied to the i-th scan line SLi. At this time, the first transistor T1 of the pixel PXLij is turned on, and the data signal DATAij applied to the data line DLj can be stored in the storage capacitor Cst of the pixel PXLij.

[0071] On the other hand, when charging the data signal DATAij to the pixel PXLij, the light-emitting diode LD of the pixel connected to the (i - 1)-th scan line SL(i - 1) and the j-th data line DLj can emit light with a brightness corresponding to the data signal DATA(i - 1)j. Similarly, after charging the data signal DATAij to the storage capacitor Cst, the light-emitting diode LD of the pixel PXLij can emit light with a brightness corresponding to the data signal DATAij.

[0072] Figure 4 FIG. is a diagram for explaining a sensor driving unit according to an embodiment of the present invention.

[0073] Refer to Figure 4 , and the case where the sensor driving unit 220 operates in a mutual capacitance driving mode will be described. In Figure 4 , the configurations of the sensor unit 120 and the sensor driving unit 220 are shown centering on a certain sensor channel 222.

[0074] The sensor driving unit 220 may include an inductive receiving unit TSC and an inductive transmitting unit TDC. One end of the first inductive line may be electrically connected to the first sensor RX. The inductive receiving unit TSC may be connected to the other end of the first inductive line and receive a first inductive signal through the first inductive line. One end of the second inductive line may be electrically connected to the second sensor TX. The inductive transmitting unit TDC may be connected to the other end of the second inductive line and transmit a second inductive signal through the second inductive line.

[0075] The inductive receiving unit TSC may include an operational amplifier AMP, an analog-to-digital converter 224, and a processor 226. As an example, each sensor channel 222 may be implemented by an AFE (analog front end) including at least one operational amplifier AMP. The analog-to-digital converter 224 and the processor 226 may be provided in each sensor channel 222, or the analog-to-digital converter 224 and the processor 226 may be shared among multiple sensor channels 222.

[0076] The operational amplifier AMP may have its first input terminal IN1 connected to the other end of the first sensing line, and the second input terminal IN2 connected to the reference power supply GND. For example, the first input terminal IN1 may be an inverting terminal, and the second input terminal IN2 may be a non-inverting terminal. The reference power supply GND may be a ground voltage or a voltage of a specific magnitude.

[0077] The analog-to-digital converter 224 may be connected to the output terminal OUT1 of the operational amplifier AMP. The capacitor Ca and the switch SWr may be connected in parallel between the first input terminal IN1 and the output terminal OUT1.

[0078] A description of the driving method of the sensor driving unit 220 is as follows: during the sensing period, a second sensing signal (or driving signal) is supplied from the sensing transmitting unit TDC to the second sensor TX. According to an embodiment, the second sensing signal may be an AC signal having a predetermined period, such as a pulse wave.

[0079] The sensing receiving unit TSC may receive the first sensing signal generated by the second sensing signal. The first sensing signal may be generated based on the mutual capacitance formed by the first sensor RX and the second sensor TX. Depending on the degree to which an object body OBJ, such as a user's finger, approaches the second sensor TX, the mutual capacitance formed by the first sensor RX and the second sensor TX may be different, and thus the first sensing signal may also be different. The presence or absence of touch of the object body OBJ can be detected using such a difference in the first sensing signal.

[0080] On the other hand, as Figure 1 shown, in the case where the sensor unit 120 includes a plurality of second sensors TX, the sensing transmitting unit TDC may sequentially supply the second sensing signal to each group of second sensors TX during the sensing period.

[0081] In addition, as Figure 1 shown, in the case where the sensor unit 120 includes a plurality of first sensors RX, the sensing receiving unit TSC may include a plurality of sensor channels 222, and each sensor channel 222 may be electrically connected to each group of first sensors RX. The sensing receiving unit TSC may receive a plurality of first sensing signals from the plurality of sensor channels 222 for each second sensing signal, and detect the user's input by synthesizing the received plurality of first sensing signals.

[0082] The sensor channel 222 may generate an output signal corresponding to the voltage difference between the first input terminal IN1 and the second input terminal IN2. For example, the sensor channel 222 may amplify the differential voltage between the first input terminal IN1 and the second input terminal IN2 to a level corresponding to a predetermined gain and output it.

[0083] According to an embodiment, the sensor channel 222 can be implemented by an integrator. In this case, a capacitor Ca and a switch SWr can be connected in parallel with each other between the first input terminal IN1 and the output terminal OUT1 of the operational amplifier AMP. For example, the switch SWr is turned on before receiving the first induction signal, so that the charge of the capacitor Ca can be initialized. At the start point of receiving the first induction signal, the switch SWr can be in an off state.

[0084] The analog-to-digital converter 224 can convert the analog signals input from the respective sensor channels 222 into digital signals. The processor 226 can analyze such digital signals to detect the user's input.

[0085] According to an embodiment of the present invention, a decoupling capacitor Cdc electrically connected to the first induction line may also be provided. For example, the first electrode of the decoupling capacitor Cdc can be connected to the first induction line, and the second electrode can be connected to the reference power supply GND.

[0086] Figure 5 and Figure 6 are diagrams for explaining the decoupling capacitor related to each embodiment of the present invention.

[0087] Referring to Figure 5 , the display device 1 may include a circuit board FSUB connected to the panel 10.

[0088] The circuit board FSUB may include a first induction pad RXP electrically connected to the first sensor RX, a second induction pad TXP electrically connected to the second sensor TX, and a data pad DTP electrically connected to the pixel PXL. The circuit board FSUB may include an induction pad portion PDs, and the induction pad portion PDs includes at least one first induction pad RXP, at least one second induction pad TXP, and at least one data pad DTP. Although not shown, the panel 10 may include a panel pad portion, and the panel pad portion may be electrically connected to the induction pad portion PDs of the circuit board FSUB.

[0089] The circuit board FSUB may further include a sensor driving unit 220, at least one first induction line FRXL, at least one second induction line FTXL, at least one data line FDL, and a first decoupling capacitor Cdc1. For the sake of convenience of explanation, in Figure 5Only the first electrode of the first decoupling capacitor Cdc1 is shown. For example, the sensor driving unit 220, the first sensing line FRXL, the second sensing line FTXL, the sensing pad unit PDs, and the first decoupling capacitor Cdc1 may be located in the main area FS1 of the circuit substrate FSUB. For example, the data line FDL may be located in the sub-area FS2 of the circuit substrate FSUB. For example, the main area FS1 may have a relatively wide area for integrating various circuit elements, and the sub-area FS2 may have a relatively narrow area for integrating wirings. For example, the data line FDL may extend along the sub-area FS2 to be connected to the display driving unit 210. On the other hand, the sub-area FS2 may also be configured in the form of a cable.

[0090] One end of the first sensing line FRXL of the circuit substrate FSUB may be connected to the first sensing pad RXP, and the other end may be connected to the sensor driving unit 220. For example, one end of the first sensing line FRXL of the circuit substrate FSUB may be connected to the first sensor RX through the first sensing pad RXP and the first sensing line RXL of the sensor unit 120. For example, the other end of the first sensing line FRXL of the circuit substrate FSUB may be connected to the first input terminal IN1 of the sensing receiving unit TSC.

[0091] One end of the second sensing line FTXL of the circuit substrate FSUB may be connected to the second sensing pad TXP, and the other end may be connected to the sensor driving unit 220. For example, one end of the second sensing line FTXL of the circuit substrate FSUB may be connected to the second sensor TX through the second sensing pad TXP and the second sensing line TXL of the sensor unit 120. For example, the other end of the second sensing line FTXL of the circuit substrate FSUB may be connected to the sensing transmitting unit TDC.

[0092] One end of the data line FDL of the circuit substrate FSUB may be connected to the data pad DTP. For example, one end of the data line FDL of the circuit substrate FSUB may be connected to the pixel PXL through the data pad DTP and the data line DL of the display unit 110. As described above, the other end of the data line FDL of the circuit substrate FSUB may be connected to the display driving unit 210.

[0093] The first decoupling capacitor Cdc1 may have a contact point with the first sensing line FRXL between the first location RCP where the first sensing line FRXL and the data line FDL overlap and the sensor driving unit 220. For example, the first electrode of the first decoupling capacitor Cdc1 may be connected to the first sensing line FRXL at the corresponding contact point.

[0094] A portion extending between a first location RCP in the first sensing line FRXL and the sensor driving unit 220 and the first decoupling capacitor Cdc1 may constitute a low pass filter. At this time, the passband of the low pass filter may correspond to the frequency of the first sensing signal received by the sensor driving unit 220 through the first sensing line FRXL. In addition, the stopband of the low pass filter may correspond to the frequency of the data signal transmitted to the data pad DTP through the data line FDL.

[0095] As described above, the transmission speed of each signal including the data signal tends to be high-speed. At this time, in order to transmit correct data, a short rising / falling transition time is required. Due to the shortened transition time, the data signal includes high-frequency components, and there is a problem that such high-frequency components may be coupled with surrounding signals to cause crosstalk. In particular, the first sensing line FRXL overlapping the data line FDL at the first location RCP is most affected by crosstalk. The second sensing line FTXL also overlaps the data line FDL at the second location TCP, but the voltage of the second sensing line FTXL is dominated by the induction transmission unit TDC, so the influence of crosstalk is relatively small. On the contrary, since the first sensing line FRXL receives the first sensing signal in a floating state, it is sensitive to crosstalk. The first sensing signal whose voltage level becomes different due to the influence of crosstalk may cause a problem of misjudging the user's input.

[0096] To solve this problem, in an embodiment of the present invention, the first decoupling capacitor Cdc1 and the resistance component of the first sensing line FRXL may be used to constitute a low pass filter. Thereby, the first sensing signal having a relatively low frequency can be passed, and the noise caused by the data signal having a relatively high frequency can be blocked.

[0097] In addition, in an embodiment of the present invention, the physical position of the contact point of the first decoupling capacitor Cdc1 and the first sensing line FRXL may be set between the first location RCP and the sensor driving unit 220. The voltage component causing crosstalk may be generated at the first location RCP and spread in two directions from the first location RCP to the first sensing line FRXL. At this time, it is important to prevent the malfunction of the sensor driving unit 220, so it is effective to set the physical position of the low pass filter between the first location RCP and the sensor driving unit 220.

[0098] In this embodiment, a high-speed transmitted signal is described as the data signal, but the embodiments of the present invention may be applied to all signals having a signal line overlapping the first sensing line FRXL as a high-speed signal transmitted from the display driving unit 210.

[0099] Reference Figure 6 , the circuit board FSUB may further include a second decoupling capacitor Cdc2, and the second decoupling capacitor Cdc2 has a connection point between the first location RCP and the sensor driving unit 220 and the first induction line FRXL. Similar to the description in Figure 5 , a portion extending between the first location RCP and the sensor driving unit 220 among the first induction lines FRXL, the first decoupling capacitor Cdc1, and the second decoupling capacitor Cdc2 may form a low-pass filter. Similarly, the circuit board FSUB may further include a third decoupling capacitor Cdc3. For the content of the low-pass filter, reference may be made to the description of Figure 5 .

[0100] As described above, in the case of using a plurality of decoupling capacitors Cdc1, Cdc2, and Cdc3, the decoupling capacitors Cdc1, Cdc2, and Cdc3 may be formed of small capacitances that have no influence on the first induction signal. For example, the capacitances of the decoupling capacitors Cdc1, Cdc2, and Cdc3 may be set in the range of 1 pF to 100 pF. However, the capacitances of the decoupling capacitors Cdc1, Cdc2, and Cdc3 may vary according to the specifications such as the size, area, length, and material of each component. In addition, in the case where a plurality of decoupling capacitors Cdc1, Cdc2, and Cdc3 with small capacitances are dispersedly mounted as in this embodiment, the coupling effect will decrease.

[0101] As described above, the second induction line FTXL also overlaps with the data line FDL at the second location TCP, but the voltage of the second induction line FTXL is dominated by the induction transmitting unit TDC, so the influence of crosstalk is relatively small. Therefore, the second induction line FTXL may not be connected to any decoupling capacitor between the second location TCP where the second induction line FTXL and the data line FDL overlap and the sensor driving unit 220. Thereby, the manufacturing cost can be reduced.

[0102] Figure 7 FIG. is a diagram for explaining a display device according to another embodiment of the present invention.

[0103] Reference Figure 7 , the difference between the sensor unit 120' of the display device 1' and the display device 1 of Figure 1 is that it includes a self-capacitance type sensor SX and an induction line SXL. For example, each sensor SX may be connected to the sensor driving unit 220' through a dedicated induction line SXL.

[0104] Figure 8 FIG. is a diagram for explaining a sensor driving unit according to another embodiment of the present invention.

[0105] Refer to Figure 8 , the internal structure of the inductive receiving unit TSC and the inductive transmitting unit TDC can be substantially the same as that of Figure 4 . The repeated description thereof is omitted, and the differences will be mainly described below. In addition, for ease of explanation, the sensor SX will be named the first sensor SX and the second sensor SX different from the first sensor SX respectively for the following description.

[0106] In this embodiment, the inductive receiving unit TSC may include an operational amplifier AMP whose first input terminal IN1 is connected to the other end of the first inductive wire. One end of the first inductive wire may be connected to the first sensor SX.

[0107] The inductive transmitting unit TDC may send a driving signal to the second input terminal IN2 of the operational amplifier AMP.

[0108] The inductive receiving unit TSC may use the first inductive signal generated according to the driving signal to make the first sensor SX perform induction. When an object body OBJ such as a user's finger approaches the first sensor SX, a first inductive signal is generated based on the self-capacitance formed by the object body surface OE and the first sensor SX. On the contrary, when the object body OBJ does not approach the first sensor SX, the first inductive signal is generated regardless of the self-capacitance. Using this difference in the first inductive signal, it is possible to detect whether there is an input caused by the object body OBJ.

[0109] According to an embodiment of the present invention, a decoupling capacitor Cdc electrically connected to the first inductive wire may also be provided. For example, the first electrode of the decoupling capacitor Cdc may be connected to the first inductive wire, and the second electrode may be connected to the reference power supply GND.

[0110] Figure 9 and Figure 10 are diagrams for explaining the decoupling capacitors related to other embodiments of the present invention. When explaining Figure 9 and Figure 10 , the description of the content repeated with Figure 5 and Figure 6 is omitted.

[0111] The circuit board FSUB may include a first inductive pad SXP1 electrically connected to the first sensor SX and a second inductive pad SXP2 electrically connected to the second sensor SX (different from the first sensor SX).

[0112] Refer to Figure 9, the circuit board FSUB may further include a first decoupling capacitor Cdc1 and a second decoupling capacitor Cdc2. The first decoupling capacitor Cdc1 may have a connection point with the first sensing line FSXL1 between the first location SCP1 where the first sensing line FSXL1 and the data line FDL overlap and the sensor driving unit 220'. The second decoupling capacitor Cdc2 may have a connection point with the second sensing line FSXL2 between the second location SCP2 where the second sensing line FSXL2 and the data line FDL overlap and the sensor driving unit 220'.

[0113] Refer to Figure 8 , the sensor channels 222 of the sensor SX may receive the sensing signal in a floating state, so they are sensitive to crosstalk. Therefore, according to this embodiment, decoupling capacitors Cdc1, Cdc2,... are connected to all the sensing lines FSXL1, FSXL2,..., so that crosstalk can be effectively prevented. Further effects can be referred to the description of Figure 5 .

[0114] Refer to Figure 10 , the first sensing line FSXL1 may be connected to a plurality of decoupling capacitors Cdc1, Cdc3,... between the first location SCP1 and the sensor driving unit 220'. The portion extending between the first location SCP1 and the sensor driving unit 220' among the first sensing lines FSXL1, the first decoupling capacitor Cdc1, and the third decoupling capacitor Cdc3... may form a first low-pass filter. The passband of the first low-pass filter may correspond to the frequency of the first sensing signal received by the sensor driving unit 220' through the first sensing line FSXL1, and the stopband of the first low-pass filter may correspond to the frequency of the data signal sent to the data pad DTP through the data line FDL.

[0115] Similarly, the second sensing line FSXL2 may be connected to a plurality of decoupling capacitors Cdc2, Cdc4,... between the second location SCP2 and the sensor driving unit 220'. The portion extending between the second location SCP2 and the sensor driving unit 220' among the second sensing lines FSXL2, the second decoupling capacitor Cdc2, and the fourth decoupling capacitor Cdc4... may form a second low-pass filter. The passband of the second low-pass filter may correspond to the frequency of the second sensing signal received by the sensor driving unit 220' through the second sensing line FSXL2, and the stopband of the second low-pass filter may correspond to the frequency of the data signal sent to the data pad DTP through the data line FDL.

[0116] As in this embodiment, when a plurality of decoupling capacitors Cdc1, Cdc2, Cdc3, Cdc4 with small capacitances are installed dispersedly, the reduction of the coupling effect will increase. Further effects can be referred to the description of Figure 6 .

[0117] The accompanying drawings and the detailed description of the invention referred to so far are only examples of the present invention, and are used only for the purpose of illustrating the present invention, not for limiting the meaning or the scope of the present invention described in the claims. Therefore, those skilled in the art should understand that various modifications and equivalent other embodiments can be achieved therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical idea of the claims.

Claims

1. A display device, comprising: a panel including a plurality of pixels and a first sensor and a second sensor overlapping with the plurality of pixels; and a circuit board including a first sensing pad electrically connected to the first sensor, a second sensing pad electrically connected to the second sensor, and a data pad electrically connected to the plurality of pixels, wherein the circuit board includes: a sensor driving unit; a first sensing line for receiving a sensing signal, having one end connected to the first sensing pad and the other end connected to the sensor driving unit; a second sensing line having one end connected to the second sensing pad and the other end connected to the sensor driving unit; a data line having one end connected to the data pad; and a first decoupling capacitor between the first location where the first sensing line and the data line overlap and the sensor driving unit, the first decoupling capacitor and the first sensing line having a connection point.

2. The display device according to claim 1, wherein, the circuit board further includes: a second decoupling capacitor between the first location and the sensor driving unit, the second decoupling capacitor and the first sensing line having a connection point.

3. The display device according to claim 2, wherein, a portion extending between the first location among the first sensing lines and the sensor driving unit, the first decoupling capacitor, and the second decoupling capacitor form a low-pass filter.

4. The display device according to claim 3, wherein, the passband of the low-pass filter corresponds to the frequency of the first sensing signal received by the sensor driving unit through the first sensing line, the stopband of the low-pass filter corresponds to the frequency of the data signal sent to the data pad through the data line.

5. The display device according to claim 1, wherein, the sensor driving unit includes: a sensing receiving unit connected to the other end of the first sensing line and receiving a first sensing signal through the first sensing line; and a sensing transmitting unit connected to the other end of the second sensing line and transmitting a second sensing signal through the second sensing line.

6. The display device according to claim 5, wherein, the first sensor and the second sensor form a mutual capacitance.

7. The display device according to claim 6, wherein, the sensing receiving unit includes: an operational amplifier, a first input terminal connected to the other end of the first sensing line, and a second input terminal connected to a reference power supply.

8. The display device according to claim 7, wherein, the sensing receiving unit further includes: an analog-to-digital converter connected to the output terminal of the operational amplifier.

9. The display device according to claim 8, wherein, the sensing receiving unit further includes: a capacitor and a switch connected in parallel between the first input terminal and the output terminal.

10. The display device according to claim 1, wherein, the second sensing line is not connected to any decoupling capacitor between the second location where the second sensing line and the data line overlap and the sensor driving unit.

11. The display device according to claim 1, wherein, The first pixel among the multiple pixels includes: a first transistor, where a first electrode is electrically connected to the data pad, and a gate electrode is electrically connected to the scan line.

12. The display device according to claim 11, wherein, the first pixel further includes: a second transistor, where a first electrode is connected to a first power supply line, and a gate electrode is connected to a second electrode of the first transistor; a storage capacitor, where a first electrode is connected to the first power supply line, and a second electrode is connected to the gate electrode of the second transistor; and a light-emitting diode, where an anode is connected to a second electrode of the second transistor, and a cathode is connected to a second power supply line.

13. The display device according to claim 1, wherein, the circuit board further includes: a second decoupling capacitor, between the second location where the second induction line and the data line overlap and the sensor driving unit, and this second decoupling capacitor has a connection point with the second induction line.

14. The display device according to claim 13, wherein, the circuit board further includes: a third decoupling capacitor, between the first location and the sensor driving unit, and this third decoupling capacitor has a connection point with the first induction line.

15. The display device according to claim 14, wherein, the circuit board further includes: a fourth decoupling capacitor, between the second location and the sensor driving unit, and this fourth decoupling capacitor has a connection point with the second induction line.

16. The display device according to claim 15, wherein, a portion extending between the first location among the first induction lines and the sensor driving unit, the first decoupling capacitor, and the third decoupling capacitor form a first low-pass filter.

17. The display device according to claim 16, wherein, a portion extending between the second location in the second induction line and the sensor driving unit, the second decoupling capacitor, and the fourth decoupling capacitor form a second low-pass filter.

18. The display device according to claim 17, wherein, the passband of the first low-pass filter corresponds to the frequency of the first induction signal received by the sensor driving unit through the first induction line, the stopband of the first low-pass filter corresponds to the frequency of the data signal sent to the data pad through the data line.

19. The display device according to claim 18, wherein, the passband of the second low-pass filter corresponds to the frequency of the second induction signal received by the sensor driving unit through the second induction line, the stopband of the second low-pass filter corresponds to the frequency of the data signal.

20. The display device according to claim 13, wherein, the sensor driving unit includes: an induction receiving unit, including an operational amplifier with a first input terminal connected to the other end of the first induction line, and receiving a first induction signal through the first induction line; and an induction sending unit, sending a driving signal to a second input terminal of the operational amplifier.

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