Sensing circuit and display device having the sensing circuit

Abstract

This disclosure provides a sensing circuit and a display device including the sensing circuit. The sensing circuit includes: a first input selection circuit connected to a first sensing line and a second sensing line; a first path setting circuit for setting a path for a first sensing signal received from the first sensing line or a path for a second sensing signal received from the second sensing line; a second path setting circuit for setting a path for a sensing reference voltage; a first switch matrix connected to the first path setting circuit and the second path setting circuit; a first mode setting circuit connected to a first output terminal of the first switch matrix; a first common sensing amplifier connected to the first mode setting circuit; a second mode setting circuit connected to a second output terminal of the first switch matrix; and a second common sensing amplifier connected to the second mode setting circuit.

Description

Technical Field

[0001] Embodiments of the present invention relate to a sensing circuit and a display device including said sensing circuit. More specifically, embodiments of the present invention relate to a sensing circuit for sensing the electrical characteristics of a switching element of a pixel and a display device including said sensing circuit. Background Technology

[0002] Typically, a display device may include a display panel and a display panel driver. The display panel may include multiple gate lines, multiple data lines, and multiple pixels. The display panel driver may include a gate driver and a data driver. The gate driver can output gate signals to the gate lines. The data driver can output data voltages to the data lines. The display panel driver may also include sensing circuitry for receiving sensing signals from the pixels.

[0003] In write mode, the data driver can output a data voltage to the display panel. In sensing mode, the data driver can output a sensing data voltage to the display panel. In sensing mode, the sensing circuit can sense the electrical characteristics of the pixel's switching element by sensing the pixel's voltage. Summary of the Invention

[0004] Embodiments of the present invention provide a sensing circuit that can improve sensing accuracy by using the voltage of a switching element of a sensing pixel that is disposed in front of (e.g., connected to) a common sensing amplifier for multiple sensing lines.

[0005] An embodiment of the present invention also provides a display device including the aforementioned sensing circuit.

[0006] In an embodiment of the sensing circuit according to the present invention, the sensing circuit includes a first input selection circuit, a first path setting circuit, a second path setting circuit, a first switch matrix, a first mode setting circuit, a first common sensing amplifier, a second mode setting circuit, and a second common sensing amplifier. The first input selection circuit is connected to a first sensing line and a second sensing line. The first path setting circuit is configured to set a path for a first sensing signal received from the first sensing line or a path for a second sensing signal received from the second sensing line. The second path setting circuit is configured to set a path for a sensing reference voltage. The first switch matrix is ​​connected to the first path setting circuit and the second path setting circuit. The first mode setting circuit is connected to a first output terminal of the first switch matrix. The first common sensing amplifier is connected to the first mode setting circuit. The second mode setting circuit is connected to a second output terminal of the first switch matrix. The second common sensing amplifier is connected to the second mode setting circuit.

[0007] In an embodiment, the sensing circuit may further include an analog-to-digital converter connected to the output terminal of the first common sensing amplifier and the output terminal of the second common sensing amplifier.

[0008] In an embodiment, the first mode setting circuit may include: a first mode setting switch connected between the first output terminal of the first switch matrix and the first input terminal of the first common sense amplifier; and a second mode setting switch connected between the first output terminal of the first switch matrix and the first input terminal of the analog-to-digital converter.

[0009] In one embodiment, the sensing circuit may further include a first amplifier capacitor and a first amplifier switch connected between the first input terminal and the output terminal of the first common sensing amplifier. The first amplifier capacitor and the first amplifier switch may be connected in parallel with each other.

[0010] In an embodiment, the second mode setting circuit may include: a third mode setting switch connected between the second output terminal of the first switch matrix and the second input terminal of the analog-to-digital converter, and a fourth mode setting switch connected between the second output terminal of the first switch matrix and the first input terminal of the second common sense amplifier.

[0011] In one embodiment, the sensing circuit may further include a second amplifier capacitor and a second amplifier switch connected between the first input terminal and the output terminal of the second common sensing amplifier. The second amplifier capacitor and the second amplifier switch may be connected in parallel with each other.

[0012] In an embodiment, the first input selection circuit may include a first input selection switch connected between the first sensing line and the first input node; a second input selection switch connected between the first sensing line and the initialization terminal; a third input selection switch connected between the second sensing line and the first input node; and a fourth input selection switch connected between the second sensing line and the initialization terminal.

[0013] In an embodiment, the first path setting circuit may include a first path setting switch, a second path setting switch, a third path setting switch, a fourth path setting switch, and a first capacitor. The first path setting switch may be connected between the first input node and the third path setting switch. The second path setting switch may be connected between the first path setting switch and the fourth path setting switch. The third path setting switch may be connected between the first path setting switch and the first capacitor. The fourth path setting switch may be connected between the first capacitor and the first switch matrix.

[0014] In one embodiment, the second path setting circuit may include a fifth path setting switch, a sixth path setting switch, a seventh path setting switch, an eighth path setting switch, and a second capacitor. The fifth path setting switch may be connected between a sensing reference voltage input node configured to receive the sensing reference voltage and the sixth path setting switch. The sixth path setting switch may be connected between the fifth path setting switch and the second capacitor. The seventh path setting switch may be connected between the fifth path setting switch and the eighth path setting switch. The eighth path setting switch may be connected between the second capacitor and the first switch matrix.

[0015] In an embodiment, the sensing circuit may further include a first voltage selection circuit configured to provide the sensing reference voltage to the second path setting circuit. The first voltage selection circuit may include: a first voltage selection switch, including a first terminal configured to receive the first sensing reference voltage and a second terminal connected to the fifth path setting switch; and a second voltage selection switch, including a first terminal configured to receive a second sensing reference voltage and a second terminal connected to the fifth path setting switch.

[0016] In one embodiment, the sensing circuit may further include a first calibration circuit connected to the first input selection circuit. The first calibration circuit may be configured to output a calibration voltage to the first input node.

[0017] In an embodiment, the sensing circuit may further include: a second input selection circuit connected to a third sensing line and a fourth sensing line; a third path setting circuit configured to set the path of a third sensing signal received from the third sensing line or the path of a fourth sensing signal received from the fourth sensing line; a fourth path setting circuit configured to set the path of the sensing reference voltage; and a second switch matrix connected to the third path setting circuit, the fourth path setting circuit, and the first switch matrix.

[0018] In an embodiment, the sensing circuit may further include a first channel switching circuit, which is connected to the first path setting circuit and the fourth path setting circuit.

[0019] In an embodiment, the first channel switching circuit may include a first channel switching switch connected between the first path setting circuit and the first channel switching node; a second channel switching switch connected between the first node of the fourth path setting circuit and the first channel switching node; and a third channel switching switch connected between the second node of the fourth path setting circuit and the first channel switching node.

[0020] In an embodiment, the sensing circuit may further include a second channel switching circuit, which connects the second path setting circuit and the third path setting circuit.

[0021] In an embodiment, the second channel switching circuit may include: a fourth channel switching switch connected between the first node of the second path setting circuit and the second channel switching node; a fifth channel switching switch connected between the second node of the second path setting circuit and the second channel switching node; and a sixth channel switching switch connected between the third path setting circuit and the second channel switching node.

[0022] In an embodiment of a display device according to the present invention, the display device includes a display panel and a readout chip. The display panel is configured to display an image based on an input image. The display panel includes a plurality of data lines, a plurality of sensing lines, and a plurality of pixels connected to the plurality of data lines and the plurality of sensing lines. The readout chip is configured to receive a sensing signal through at least one of the plurality of sensing lines and output a data voltage compensated based on the sensing signal to at least one of the plurality of data lines. The readout chip includes: a first input selection circuit connected to a first sensing pad and a second sensing pad; a first path setting circuit configured to set a path for a first sensing signal received from the first sensing pad or a path for a second sensing signal received from the second sensing pad; a second path setting circuit configured to set a path for a sensing reference voltage; a first switch matrix connected to the first path setting circuit and the second path setting circuit; a first mode setting circuit connected to a first output terminal of the first switch matrix; a first common sensing amplifier connected to the first mode setting circuit; a second mode setting circuit connected to a second output terminal of the first switch matrix; and a second common sensing amplifier connected to the second mode setting circuit.

[0023] In an embodiment, in single-sensor mode, the first sensing signal of the first sensing pad can be applied to the first input terminal of the analog-to-digital converter via the first common sensing amplifier, and the sensing reference voltage can be applied to the second input terminal of the analog-to-digital converter.

[0024] In an embodiment, in differential sensing mode, the first sensing signal of the first sensing pad can be applied to the first input terminal of the analog-to-digital converter via the first common sensing amplifier, and the third sensing signal of the third sensing pad can be applied to the second input terminal of the analog-to-digital converter via the second common sensing amplifier.

[0025] In an embodiment, in the amplifierless mode, the first sensing signal of the first sensing pad can be applied to the first input terminal of the analog-to-digital converter via a first path that bypasses the first common sensing amplifier in the first mode setting circuit, and the sensing reference voltage can be applied to the second input terminal of the analog-to-digital converter via a second path that bypasses the second common sensing amplifier in the second mode setting circuit.

[0026] According to the sensing circuit and the display device including the sensing circuit, the sensing circuit can use a common sensing amplifier disposed in front of (e.g., connected to) an analog-to-digital converter for multiple sensing lines to sense the electrical characteristics of the switching elements of the pixel. The sensing circuit can use a common sensing amplifier, thereby preventing or reducing the reduction in sensing accuracy of the electrical characteristics of the pixel's switching elements due to deviations in the feedback capacitance of the sensing amplifier. Additionally, it can prevent or reduce the reduction in sensing accuracy of the pixel's switching elements due to voltage differences between the input terminals of the sensing amplifier caused by amplifier offsets.

[0027] The sensing circuit can use a common sensing amplifier for multiple sensing lines to sense the electrical characteristics of the switching elements of the pixels, thereby improving sensing accuracy. Consequently, the accuracy of the electrical characteristics of the switching elements used to compensate for the pixels can be improved, and the display quality of the display panel can be enhanced. Attached Figure Description

[0028] The above and other features of the present invention will become more apparent from the detailed description of its embodiments with reference to the accompanying drawings, in which:

[0029] Figure 1 This is a block diagram illustrating a display device according to an embodiment of the concept of the present invention;

[0030] Figure 2 This illustrates an embodiment based on the concept of the present invention. Figure 1 A floor plan of the display device;

[0031] Figure 3 This illustrates an embodiment based on the concept of the present invention. Figure 1 The circuit diagram of the pixels;

[0032] Figure 4 This illustrates an embodiment of the concept according to the invention in sensing mode. Figure 3 Timing diagram of the input and output signals of the pixels;

[0033] Figure 5 This illustrates an embodiment based on the concept of the present invention. Figure 1 A circuit diagram of the sensing circuit of a display device;

[0034] Figure 6 This illustrates sensing a sensing signal of a first sensing line in a first mode according to an embodiment of the present invention. Figure 5 The circuit diagram of the sensing circuit;

[0035] Figure 7 This illustrates sensing a sensing signal of a third sensing line in a first mode according to an embodiment of the present invention. Figure 5 The circuit diagram of the sensing circuit;

[0036] Figure 8 This illustrates sensing a sensing signal of the first sensing line in a second mode according to an embodiment of the present invention. Figure 5 The circuit diagram of the sensing circuit;

[0037] Figure 9 This illustrates sensing a sensing signal of a third sensing line in a second mode according to an embodiment of the present invention. Figure 5 The circuit diagram of the sensing circuit;

[0038] Figure 10 This illustrates sensing a sensing signal of a second sensing line in a second mode according to an embodiment of the present invention. Figure 5 The circuit diagram of the sensing circuit;

[0039] Figure 11 This illustrates an embodiment of the invention, showing the sensing signal of the first sensing line in a third mode. Figure 5 The circuit diagram of the sensing circuit;

[0040] Figure 12 This illustrates a sensing signal of a third sensing line in a third mode, according to an embodiment of the present invention. Figure 5 The circuit diagram of the sensing circuit;

[0041] Figure 13 This illustrates a sensing signal of the second sensing line in a third mode according to an embodiment of the present invention. Figure 5The circuit diagram of the sensing circuit; and

[0042] Figure 14 This is a circuit diagram illustrating the sensing circuit of a display device according to an embodiment of the present invention. Detailed Implementation

[0043] Embodiments of the inventive concept will be described more fully below with reference to the accompanying drawings. Throughout the drawings, the same reference numerals may refer to the same elements.

[0044] The terms “first,” “second,” “third,” etc., are used herein to distinguish one element from another, and these elements are not limited by these terms. Thus, a “first” element in one embodiment may be described as a “second” or “third” element in another embodiment.

[0045] Unless the context clearly indicates otherwise, the description of features or aspects within each embodiment should generally be considered as other similar features or aspects that may be used in other embodiments.

[0046] Unless the context clearly indicates otherwise, the singular forms “a,” “one,” and “the” are intended to include the plural forms as used herein.

[0047] Figure 1 This is a block diagram illustrating a display device according to an embodiment of the concept of the present invention.

[0048] refer to Figure 1 The display device includes a display panel 100 and a display panel driver. The display panel driver includes a drive controller 200, a gate driver 300, a gamma reference voltage generator 400, and a data driver 500.

[0049] In one embodiment, the drive controller 200 and the data driver 500 may be integrally formed. In another embodiment, the drive controller 200, the gamma reference voltage generator 400, and the data driver 500 may be integrally formed. A drive module comprising at least the integrally formed drive controller 200 and data driver 500 may be referred to as a timing controller embedded data driver (TED).

[0050] 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 in which no image is displayed.

[0051] In this embodiment, the display panel 100 may be an organic light-emitting diode (OLED) display panel including organic light-emitting diodes (OLEDs). For example, the display panel 100 may be a quantum dot OLED display panel including OLEDs and quantum dot color filters. Alternatively, the display panel 100 may be a quantum dot nanoLED display panel including nano-LEDs and quantum dot color filters. Alternatively, the display panel 100 may be a liquid crystal display panel including a liquid crystal layer. However, the display panel 100 is not limited to the examples described above.

[0052] 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 extend in a first direction D1 and the data lines DL extend in a second direction D2 that intersects the first direction D1.

[0053] In one embodiment, the display panel 100 may further include a plurality of sensing lines SL connected to the pixel P. The sensing lines SL may extend in a second direction D2.

[0054] In an embodiment, the display panel driver may include a sensing circuit that receives sensing signals from pixels P of the display panel 100 via a sensing line SL. The sensing circuit may be disposed within the data driver 500. When the data driver 500 is implemented as an integrated circuit (IC), the sensing circuit may be disposed within the data driver IC. Alternatively, the sensing circuit may be formed independently of the data driver 500. However, the location of the sensing circuit is not limited to the examples described above.

[0055] The drive controller 200 receives input image data IMG and input control signal CONT from an external device. The input image data IMG may include, for example, red image data, green image data, and blue image data. The input image data IMG may also include, for example, white image data. The input image data IMG may also include, for example, magenta image data, yellow image data, and cyan image data. The input control signal CONT may include a master clock signal and a data enable signal. The input control signal CONT may also include a vertical synchronization signal and a horizontal synchronization signal.

[0056] The drive 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 the input image data IMG and the input control signal CONT.

[0057] The drive 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 also include a vertical start signal and a gate clock signal.

[0058] The drive 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.

[0059] The drive controller 200 generates a data signal DATA based on the input image data IMG. The drive controller 200 outputs the data signal DATA to the data driver 500.

[0060] The drive controller 200 generates a third control signal CONT3 based on the input control signal CONT for controlling the operation of the gamma reference voltage generator 400, and outputs the third control signal CONT3 to the gamma reference voltage generator 400.

[0061] The gate driver 300 generates a gate signal for driving the gate line GL in response to a first control signal CONT1 received from the drive controller 200. The gate driver 300 outputs the gate signal to the gate line GL. For example, the gate driver 300 may sequentially output the gate signal to the gate line GL.

[0062] In one embodiment, the gate driver 300 may be integrated into the peripheral area PA of the display panel 100.

[0063] The gamma reference voltage generator 400 generates a gamma reference voltage VGREF in response to a third control signal CONT3 received from the drive 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 the level of the data signal DATA.

[0064] In one embodiment, the gamma reference voltage generator 400 may be located in the drive controller 200. In another embodiment, the gamma reference voltage generator 400 may be located in the data driver 500.

[0065] The data driver 500 receives a second control signal CONT2 and a data signal DATA from the drive controller 200, and receives a gamma reference voltage VGREF from the gamma reference voltage generator 400. The data driver 500 uses the gamma reference voltage VGREF to convert the data signal DATA into a data voltage of analog type. The data driver 500 outputs this data voltage to the data line DL.

[0066] Figure 2 This illustrates an embodiment based on the concept of the present invention. Figure 1 A floor plan of the display device.

[0067] refer to Figure 1 and Figure 2 The display device may include a printed circuit board assembly (PBA), a first printed circuit board (P1), and a second printed circuit board (P2). The PBA may be connected to the first printed circuit board (P1) and the second printed circuit board (P2). For example, a drive controller 200 may be disposed on the PBA.

[0068] The display device may also include a plurality of flexible circuit boards FP connected to the first printed circuit board P1 and the display panel 100. The display device may also include a plurality of flexible circuit boards FP connected to the second printed circuit board P2 and the display panel 100.

[0069] The readout chip RSIC of the data driver 500 can be disposed on a flexible circuit board FP. The readout chip RSIC can be, for example, an integrated circuit chip. Sensing circuitry can be disposed in the readout chip RSIC. For example, the readout chip RSIC can include both the function of outputting a data voltage to the display panel 100 and the function of receiving sensing signals from the display panel 100.

[0070] Figure 3 This illustrates an embodiment based on the concept of the present invention. Figure 1 The circuit diagram of pixel P. Figure 4 This illustrates a sensing mode in an embodiment of the present invention. Figure 3 Timing diagram of the input and output signals of pixel P.

[0071] refer to Figures 1 to 4Pixel P may include a first thin-film transistor T1 that applies a first power voltage ELVDD to a second node N2 in response to a signal at a first node N1, a second thin-film transistor T2 that outputs a data voltage VDATA to the first node N1 in response to a first signal S1, a third thin-film transistor T3 that outputs a signal at the second node N2 to a sensing node in response to a second signal S2, a storage capacitor CS that is connected to a first end of the first node N1 and a second end of the second node N2, and a light-emitting element EE that is connected to a first electrode of the second node N2 and a second electrode for receiving a second power voltage ELVSS.

[0072] Here, the second power voltage ELVSS can be less than the first power voltage ELVDD. The light-emitting element EE can be, for example, an organic light-emitting diode.

[0073] Pixel P may also include a sensing initialization switch SW that writes the sensing initialization voltage VSIN to the second node N2. The sensing initialization switch SW can be turned on and off based on a third signal S3.

[0074] For example, in one embodiment, the second signal S2 and the third signal S3 are activated during the sensing initialization operation, thereby enabling the sensing initialization voltage VSIN to be applied to the second node N2.

[0075] like Figure 4 As shown, the first signal S1 is activated in the sensing mode, thereby enabling the data voltage VDATA to be applied to the first node N1 via the second thin-film transistor T2. Here, the data voltage VDATA can be a sensing data voltage used to sense the electrical characteristics of the first thin-film transistor T1. The electrical characteristics of the first thin-film transistor T1 can be, for example, the mobility of the first thin-film transistor T1 or the threshold voltage of the first thin-film transistor T1. The data voltage VDATA can also be a sensing data voltage used to sense the electrical characteristics of the light-emitting element EE. The electrical characteristics of the light-emitting element EE can be, for example, the capacitance between the two electrodes of the light-emitting element EE.

[0076] In sensing mode, the first thin-film transistor T1 is turned on by the sensing data voltage applied to the first node N1 in sensing mode and the sensing initialization voltage VSIN applied to the second node N2 in sensing initialization operation.

[0077] In addition, the second signal S2 is also activated in the sensing mode, thereby turning on the third thin-film transistor T3 and enabling the sensing signal VR at the second node N2 to be output to the sensing line SL through the third thin-film transistor T3 in the sensing mode.

[0078] The sensing line SL can be connected to a sensing circuit. The sensing circuit may include an analog-to-digital converter (ADC). The ADC can convert the sensing signal VR at the second node N2 into a digital sensing signal to determine the threshold voltage VTH of the first thin-film transistor T1.

[0079] In this embodiment, in the sensing mode, the third signal S3 is deactivated, so that the sensing initialization voltage VSIN is not output to the sensing node in the sensing mode. In this embodiment, in the sensing mode, the second power voltage ELVSS is at a high level, so that pixel P does not emit light.

[0080] The data driver 500 can operate in both a write mode and a sensing mode. In write mode, a data voltage for displaying an image can be written to pixel P of the display panel 100. In sensing mode, a threshold voltage for pixel P can be sensed from pixel P. In write mode, the data driver 500 can output a data voltage corresponding to the grayscale value of the input image data IMG to the data line DL. Conversely, in sensing mode, the data driver 500 can output a sensed data voltage for sensing the threshold voltage of the first thin-film transistor T1 to the data line DL. In sensing mode, the sensing circuit can determine the threshold voltage of pixel P based on the sensing signal received through the sensing line SL.

[0081] The sensing mode can operate during the power-on period when the display device is turned on, the blank period between the active period when the image is written to the display panel 100, and the power-off period when the display device is turned off. The drive controller 200 can compensate the data applied to pixel P based on the threshold voltage of the sensed pixel P and output the compensated data to the data driver 500. The data driver 500 can output the compensated data voltage based on the sensing signal to the data line DL.

[0082] Figure 5 This illustrates an embodiment based on the concept of the present invention. Figure 1 The circuit diagram of the sensing circuit of the display device.

[0083] refer to Figures 1 to 5 As described above, the sensing circuit can be located in the data driver 500. When the data driver 500 is a data driver IC (e.g., Figure 2 When using RSIC in a data driver IC, the sensing circuit can be set in the data driver IC (e.g., Figure 2 In RSIC). Figure 3 The sensing line SL can be part of the pixel P connected to the display panel 100. Figure 5SL[1], SL[2], SL[3], and SL[4] can be connected to the sensing line SL of the display panel 100 and can transmit sensing signals from the sensing line SL to the sensing circuit. For example, in an embodiment, Figure 5 SL[1], SL[2], SL[3], and SL[4] can be sensing pads of sensing circuits connected to sensing lines SL of the display panel 100. Therefore, according to embodiments of the present invention, SL[1], SL[2], SL[3], and SL[4] can refer to sensing lines or sensing pads connected to the respective sensing lines. Hereinafter, SL[1], SL[2], SL[3], and SL[4] will be referred to as sensing lines or sensing pads connected to the respective sensing lines. Figure 5 SL[1], SL[2], SL[3] and SL[4] are respectively called the first sensing line, the second sensing line, the third sensing line and the fourth sensing line.

[0084] The sensing circuit may include: a first input selection circuit including switches SA01, SA02, SA03 and SA04 connected to the first sensing line SL[1] and the second sensing line SL[2]; a first path setting circuit including switches SA06, SA07, SA08, SA09 and capacitor CA for setting the path of the first sensing signal received from the first sensing line SL[1] or the path of the second sensing signal received from the second sensing line SL[2]; a second path setting circuit including switches SB03, SB04, SB05, SB06 and capacitor CB for setting the path of the sensing reference voltage; and a circuit connected to the first path setting circuit (switch SA01, SA02, SA03 and SA04). 6. A first switch matrix SM1 of the first switch matrix SM1 (SA07, SA08, SA09 and capacitor CA) and the second path setting circuit (switches SB03, SB04, SB05, SB06 and capacitor CB), a first mode setting circuit including switches SE01 and SE02 connected to the first output terminal of the first switch matrix SM1, a first common sense amplifier AE connected to the first mode setting circuit (switches SE01 and SE02), a second mode setting circuit including switches SF01 and SF02 connected to the second output terminal of the first switch matrix SM1, and a second common sense amplifier AF connected to the second mode setting circuit (SF01 and SF02).

[0085] The sensing circuit may further include an analog-to-digital converter (ADC) connected to the output terminals of a first common sensing amplifier AE and a second common sensing amplifier AF. The output terminal of the first common sensing amplifier AE can be connected to the first input terminal of the ADC via a first amplifier output switch SE04. The output terminal of the second common sensing amplifier AF can be connected to the second input terminal of the ADC via a second amplifier output switch SF04.

[0086] The switches SA01, SA02, SA03, and SA04 forming the first input selection circuit may include a first input selection switch SA01 connected between the first sensing line SL[1] and the first input node, a second input selection switch SA02 connected between the first sensing line SL[1] and the initialization terminal, a third input selection switch SA03 connected between the second sensing line SL[2] and the first input node, and a fourth input selection switch SA04 connected between the second sensing line SL[2] and the initialization terminal. The initialization voltage VINIT may be applied to the initialization terminal.

[0087] The first input selection circuit can apply the first sensing signal of the first sensing line SL[1] to the first input node by turning on the first input selection switch SA01 and turning off the third input selection switch SA03.

[0088] The first input selection circuit can apply the second sensing signal of the second sensing line SL[2] to the first input node by turning on the third input selection switch SA03 and turning off the first input selection switch SA01.

[0089] The first input selection circuit can be initialized using the second input selection switch SA02 or the fourth input selection switch SA04.

[0090] The switches SA06, SA07, SA08, and SA09 forming the first path setting circuit, as well as the capacitor CA, may include the first path setting switch SA06, the second path setting switch SA07, the third path setting switch SA08, the fourth path setting switch SA09, and the first capacitor CA.

[0091] The first path setting switch SA06 can be connected between the first input node and the third path setting switch SA08. The second path setting switch SA07 can be connected between the first path setting switch SA06 and the fourth path setting switch SA09. The third path setting switch SA08 can be connected between the first path setting switch SA06 and the first capacitor CA. The fourth path setting switch SA09 can be connected between the first capacitor CA and the first switch matrix SM1.

[0092] The sensing circuit may also include a first calibration circuit connected to the first input selection circuit. When the calibration switch SA05 is turned on, the first calibration circuit can output the calibration voltage VCAL to the first input node.

[0093] The switches SB03, SB04, SB05, and SB06 forming the second path setting circuit, as well as the capacitor CB, may include the fifth path setting switch SB03, the sixth path setting switch SB04, the seventh path setting switch SB05, the eighth path setting switch SB06, and the second capacitor CB.

[0094] The fifth path setting switch SB03 can be connected between the sensing reference voltage input node used to receive the sensing reference voltage and the sixth path setting switch SB04. The sixth path setting switch SB04 can be connected between the fifth path setting switch SB03 and the second capacitor CB. The seventh path setting switch SB05 can be connected between the fifth path setting switch SB03 and the eighth path setting switch SB06. The eighth path setting switch SB06 can be connected between the second capacitor CB and the first switch matrix SM1.

[0095] The sensing circuit may also include a first voltage selection circuit including switches SB01 and SB02 that provides a sensing reference voltage to the second path setting circuit (switches SB03, SB04, SB05 and SB06 and capacitor CB).

[0096] The switches SB01 and SB02 forming the first voltage selection circuit may include: a first voltage selection switch SB01 including a first terminal receiving a first sensed reference voltage (e.g., VINIT) and a second terminal connected to a fifth path setting switch SB03, and a second voltage selection switch SB02 including a first terminal receiving a second sensed reference voltage (e.g., GND) and a second terminal connected to a fifth path setting switch SB03.

[0097] The first voltage selection circuit (switches SB01 and SB02) can determine the sensing reference voltage by selecting one of the initialization voltage VINIT and the ground voltage GND.

[0098] The sensing circuit may further include: a second input selection circuit including switches SC01, SC02, SC03 and SC04 connected to the third sensing line SL[3] and the fourth sensing line SL[4]; a third path setting circuit including switches SC06, SC07, SC08, SC09 and capacitor CC for setting the path of the third sensing signal received from the third sensing line SL[3] or the path of the fourth sensing signal received from the fourth sensing line SL[4]; a fourth path setting circuit including switches SD03, SD04, SD05, SD06 and capacitor CD for setting the path of the sensing reference voltage; and a second switch matrix SM2 connected to the third path setting circuit (switches SC06, SC07, SC08 and SC09 and capacitor CC), the fourth path setting circuit (switches SD03, SD04, SD05, SD06 and capacitor CD) and the first switch matrix SM1.

[0099] The sensing circuit may also include a second calibration circuit connected to the second input selection circuit. When the calibration switch SC05 is turned on, the second calibration circuit can output the calibration voltage VCAL to the second input selection circuit.

[0100] The structure of the second input selection circuit (switches SC01, SC02, SC03, and SC04) is essentially the same as that of the first input selection circuit (switches SA01, SA02, SA03, and SA04). The structure of the third path setting circuit (switches SC06, SC07, SC08, and SC09 and capacitor CC) is essentially the same as that of the first path setting circuit (switches SA06, SA07, SA08, and SA09 and capacitor CA). The structure of the fourth path setting circuit (switches SD03, SD04, SD05, and SD06 and capacitor CD) is essentially the same as that of the second path setting circuit (switches SB03, SB04, SB05, and SB06 and capacitor CB).

[0101] The sensing circuit may further include a second voltage selection circuit, comprising switches SD01 and SD02, which provides a sensing reference voltage to the fourth path setting circuit (switches SD03, SD04, SD05, and SD06 and capacitor CD). The structure of the second voltage selection circuit (switches SD01 and SD02) may be substantially the same as that of the first voltage selection circuit (switches SB01 and SB02).

[0102] The sensing circuit may also include a first channel switching circuit including switches SA10, SA11 and SD07 that connects the first path setting circuit (switches SA06, SA07, SA08 and SA09 and capacitor CA) and the fourth path setting circuit (switches SD03, SD04, SD05 and SD06 and capacitor CD).

[0103] The switches SA10, SA11, and SD07 forming the first channel switching circuit may include a first channel switching switch SA10 connected between the first path setting circuit (switches SA06, SA07, SA08, and SA09 and capacitor CA) and the first channel switching node, a second channel switching switch SA11 connected between the first node of the fourth path setting circuit (switches SD03, SD04, SD05, and SD06 and capacitor CD) and the first channel switching node, and a third channel switching switch SD07 connected between the second node of the fourth path setting circuit (switches SD03, SD04, SD05, and SD06 and capacitor CD) and the first channel switching node.

[0104] The sensing circuit may also include a second channel switching circuit, including switches SB07, SC10 and SC11, connecting the second path setting circuit (switches SB03, SB04, SB05 and SB06 and capacitor CB) and the third path setting circuit (switches SC06, SC07, SC08 and SC09 and capacitor CC).

[0105] The switches SB07, SC10, and SC11 forming the second channel switching circuit may include a fourth channel switching switch SB07 connected between the first node of the second path setting circuit (switches SB03, SB04, SB05, and SB06 and capacitor CB) and the second channel switching node, a fifth channel switching switch SC11 connected between the second node of the second path setting circuit (switches SB03, SB04, SB05, and SB06 and capacitor CB) and the second channel switching node, and a sixth channel switching switch SC10 connected between the third path setting circuit (switches SC06, SC07, SC08, and SC09 and capacitor CC) and the second channel switching node.

[0106] The first mode setting circuit (switches SE01 and SE02) can set different paths according to the mode of the sensing circuit. The switches SE01 and SE02 forming the first mode setting circuit may include a first mode setting switch SE01 connected between the first output terminal of the first switch matrix SM1 and the first input terminal of the first common sensing amplifier AE, and a second mode setting switch SE02 connected between the first output terminal of the first switch matrix SM1 and the first input terminal of the analog-to-digital converter ADC.

[0107] The sensing circuit may further include a first amplifier capacitor CE1 and a first amplifier switch SE03 connected between the first input terminal and the output terminal of the first common sensing amplifier AE. The first amplifier capacitor CE1 and the first amplifier switch SE03 may be connected in parallel with each other. An initialization voltage VINIT may be applied to the second input terminal of the first common sensing amplifier AE.

[0108] The output terminal of the first common sense amplifier AE can be connected to the first input terminal of the analog-to-digital converter ADC via the first amplifier output switch SE04. The first amplifier output capacitor CE2 can be connected to the output terminal of the first common sense amplifier AE.

[0109] The second mode setting circuit (switches SF01 and SF02) can set different paths according to the mode of the sensing circuit. The switches SF01 and SF02 forming the second mode setting circuit may include a third mode setting switch SF02 connected between the second output terminal of the first switch matrix SM1 and the second input terminal of the analog-to-digital converter ADC, and a fourth mode setting switch SF01 connected between the second output terminal of the first switch matrix SM1 and the first input terminal of the second common sense amplifier AF.

[0110] The sensing circuit may further include a second amplifier capacitor CF1 and a second amplifier switch SF03 connected between the first input terminal and the output terminal of the second common sensing amplifier AF. The second amplifier capacitor CF1 and the second amplifier switch SF03 may be connected in parallel with each other. An initialization voltage VINIT may be applied to the second input terminal of the second common sensing amplifier AF.

[0111] The output terminal of the second common sense amplifier AF can be connected to the second input terminal of the analog-to-digital converter ADC via the second amplifier output switch SF04. The second amplifier output capacitor CF2 can be connected to the output terminal of the second common sense amplifier AF.

[0112] Figure 6 This illustrates the sensing signal of the first sensing line SL[1] in a first mode according to an embodiment of the present invention. Figure 5 The circuit diagram of the sensing circuit.

[0113] refer to Figure 6 The first mode is the "amplifier-free mode," in which the sensing signal is sensed without using a first common sensing amplifier AE and a second common sensing amplifier AF. Figure 6 In this mode, the signal of the first sensing line SL[1] can be sensed in the amplifierless mode.

[0114] exist Figure 6 In the first input selection circuit, switch SA01 is turned on, and switches SA06, SA08 and SA09 of the first path setting circuit are turned on, thereby applying the signal of the first sensing line SL[1] to the first input terminal of the first switch matrix SM1.

[0115] Switch SB01 of the first voltage selection circuit is turned on, thereby setting the sensed reference voltage to VINIT. Switches SB03, SB04, and SB06 are turned on, thereby applying the sensed reference voltage to the second input terminal of the first switch matrix SM1.

[0116] The switch SE02 of the first mode setting circuit is turned on, thereby applying the signal of the first sensing line SL[1] to the first input terminal of the analog-to-digital converter ADC.

[0117] The switch SF02 of the second mode setting circuit is turned on, thereby applying the sensed reference voltage to the second input terminal of the analog-to-digital converter (ADC).

[0118] Figure 7 This illustrates the sensing signal of the third sensing line SL[3] in a first mode according to an embodiment of the present invention. Figure 5 The circuit diagram of the sensing circuit.

[0119] refer to Figure 7 The first mode is the amplifier-free mode. Figure 7 In this mode, the signal of the third sensing line SL[3] can be sensed in the amplifierless mode.

[0120] exist Figure 7 In the middle, the switch SC01 of the second input selection circuit is turned on, and the switches SC06, SC08 and SC09 of the third path setting circuit are turned on, thereby applying the signal of the third sensing line SL[3] to the first input terminal of the second switch matrix SM2.

[0121] The second voltage selection circuit turns on switch SD01, thereby setting the sensed reference voltage to VINIT. Switches SD03, SD04, and SD06 turn on, thereby applying the sensed reference voltage to the second input terminal of the second switch matrix SM2.

[0122] The signal applied to the second switch matrix SM2 can be transmitted to the first switch matrix SM1.

[0123] The switch SE02 of the first mode setting circuit is turned on, thereby applying the signal of the third sensing line SL[3] to the first input terminal of the analog-to-digital converter ADC.

[0124] The switch SF02 of the second mode setting circuit is turned on, thereby applying the sensed reference voltage to the second input terminal of the analog-to-digital converter (ADC).

[0125] Figure 8 This illustrates the sensing signal of the first sensing line SL[1] in a second mode according to an embodiment of the present invention. Figure 5 The circuit diagram of the sensing circuit. Figure 9 This illustrates the sensing signal of the third sensing line SL[3] in a second mode according to an embodiment of the present invention. Figure 5 The circuit diagram of the sensing circuit. Figure 10 This illustrates the sensing signal of the second sensing line SL[2] in a second mode according to an embodiment of the present invention. Figure 5 The circuit diagram of the sensing circuit.

[0126] refer to Figures 8 to 10 The second mode is the "single-sensing mode". In the single-sensing mode, the sensing signal is applied to the first input terminal of the analog-to-digital converter (ADC) through the first common sensing amplifier AE, and the sensing reference voltage can be applied to the second input terminal of the ADC.

[0127] exist Figure 8 In the middle, switches SA01, SA06, SA07 and SA09 are turned on, so that the signal of the first sensing line SL[1] can be applied to the first input terminal of the first switch matrix SM1.

[0128] Switches SB01, SB03, SB04 and SB06 are turned on, thereby applying the sensed reference voltage to the second input terminal of the first switch matrix SM1.

[0129] The switches SE01 and SE04 of the first mode setting circuit are turned on, thereby applying the signal of the first sensing line SL[1] to the first input terminal of the analog-to-digital converter ADC through the first common sensing amplifier AE.

[0130] The switch SF02 of the second mode setting circuit is turned on, thereby applying the sensed reference voltage to the second input terminal of the analog-to-digital converter (ADC).

[0131] exist Figure 9 In the middle, switches SC01, SC06, SC07 and SC09 are turned on, so that the signal of the third sensing line SL[3] can be applied to the first input terminal of the second switch matrix SM2.

[0132] Switches SD01, SD03, SD04 and SD06 are turned on, thereby applying the sensing reference voltage to the second input terminal of the second switch matrix SM2.

[0133] The switches SE01 and SE04 of the first mode setting circuit are turned on, thereby applying the signal of the third sensing line SL[3] to the first input terminal of the analog-to-digital converter ADC through the first common sensing amplifier AE.

[0134] The switch SF02 of the second mode setting circuit is turned on, thereby applying the sensed reference voltage to the second input terminal of the analog-to-digital converter (ADC).

[0135] exist Figure 10 In the middle, switches SA03, SA06, SA07 and SA09 are turned on, so that the signal of the second sensing line SL[2] can be applied to the first input terminal of the first switch matrix SM1.

[0136] Switches SB01, SB03, SB04 and SB06 are turned on, thereby applying the sensed reference voltage to the second input terminal of the first switch matrix SM1.

[0137] The switches SE01 and SE04 of the first mode setting circuit are turned on, thereby applying the signal of the second sensing line SL[2] to the first input terminal of the analog-to-digital converter ADC through the first common sensing amplifier AE.

[0138] The switch SF02 of the second mode setting circuit is turned on, thereby applying the sensed reference voltage to the second input terminal of the analog-to-digital converter (ADC).

[0139] Figure 11 This illustrates a sensing signal of the first sensing line SL[1] in a third mode according to an embodiment of the present invention. Figure 5 The circuit diagram of the sensing circuit. Figure 12 This illustrates a sensing signal of the third sensing line SL[3] in a third mode according to an embodiment of the present invention. Figure 5 The circuit diagram of the sensing circuit. Figure 13 This illustrates a sensing signal of the second sensing line SL[2] in a third mode according to an embodiment of the present invention. Figure 5 The circuit diagram of the sensing circuit.

[0140] refer to Figures 11 to 13 The third mode is the "differential sensing mode". In differential sensing mode, the sensing signal provided from the sensing line is applied to the first input terminal of the analog-to-digital converter (ADC) through the first common sensing amplifier AE, and another sensing signal provided from the other sensing line is applied to the second input terminal of the ADC through the second common sensing amplifier AF.

[0141] exist Figure 11In the middle, switches SA01, SA06, SA07 and SA09 are turned on, so that the signal of the first sensing line SL[1] can be applied to the first input terminal of the first switch matrix SM1.

[0142] Switches SC01, SC06, SC07, SC10 and SC11 are turned on, so that the signal of the third sensing line SL[3] can be applied to the second input terminal of the first switch matrix SM1.

[0143] The switches SE01 and SE04 of the first mode setting circuit are turned on, thereby applying the signal of the first sensing line SL[1] to the first input terminal of the analog-to-digital converter ADC through the first common sensing amplifier AE.

[0144] The switches SF01 and SF04 of the second mode setting circuit are turned on, thereby applying the signal of the third sensing line SL[3] to the second input terminal of the analog-to-digital converter ADC through the second common sensing amplifier AF.

[0145] exist Figure 12 In the middle, switches SC01, SC06, SC07 and SC09 are turned on, so that the signal of the third sensing line SL[3] can be applied to the first input terminal of the second switch matrix SM2.

[0146] Switches SA01, SA06, SA07, SA10 and SA11 are turned on, so that the signal of the first sensing line SL[1] can be applied to the second input terminal of the second switch matrix SM2.

[0147] The switches SE01 and SE04 of the first mode setting circuit are turned on, thereby applying the signal of the third sensing line SL[3] to the first input terminal of the analog-to-digital converter ADC through the first common sensing amplifier AE.

[0148] The switches SF01 and SF04 of the second mode setting circuit are turned on, thereby applying the signal of the first sensing line SL[1] to the second input terminal of the analog-to-digital converter ADC through the second common sensing amplifier AF.

[0149] exist Figure 13 In the middle, switches SA03, SA06, SA07 and SA09 are turned on, so that the signal of the second sensing line SL[2] can be applied to the first input terminal of the first switch matrix SM1.

[0150] Switches SC03, SC06, SC07, SC10 and SC11 are turned on, so that the signal of the fourth sensing line SL[4] can be applied to the second input terminal of the first switch matrix SM1.

[0151] The switches SE01 and SE04 of the first mode setting circuit are turned on, thereby applying the signal of the second sensing line SL[2] to the first input terminal of the analog-to-digital converter ADC through the first common sensing amplifier AE.

[0152] The switches SF01 and SF04 of the second mode setting circuit are turned on, so that the signal of the fourth sensing line SL[4] is applied to the second input terminal of the analog-to-digital converter ADC through the second common sensing amplifier AF.

[0153] According to embodiments of the present invention, the sensing circuit can use a first common sensing amplifier AE and a second common sensing amplifier AF disposed (e.g., connected to) an analog-to-digital converter (ADC) for multiple sensing lines to sense the electrical characteristics of the switching element of pixel P. By using the first common sensing amplifier AE and the second common sensing amplifier AF, the sensing circuit can prevent or reduce the reduction in sensing accuracy of the electrical characteristics of the switching element of pixel P due to deviations in the feedback capacitance of the sensing amplifier. Furthermore, it can prevent or reduce the reduction in sensing accuracy of the electrical characteristics of the switching element of pixel P due to voltage differences between the input terminals of the sensing amplifier caused by amplifier offsets.

[0154] The sensing circuit can use a first common sensing amplifier AE and a second common sensing amplifier AF for multiple sensing lines to sense the electrical characteristics of the switching element of pixel P, thereby improving sensing accuracy. Therefore, the accuracy of the electrical characteristics used to compensate for pixel P can be improved, thereby improving the display quality of the display panel 100.

[0155] Figure 14 This is a circuit diagram illustrating the sensing circuit of a display device according to an embodiment of the present invention.

[0156] according to Figure 14 The sensing circuit and display device of the embodiment shown are related to the reference. Figures 1 to 13 The described sensing circuit and display device are essentially the same, except for the structure of the sensing circuit. Therefore, for ease of explanation, the same reference numerals are used to denote those consistent with previous references. Figures 1 to 13 The same or similar parts described may be omitted, and any repeated descriptions related to the above elements may be omitted.

[0157] refer to Figures 1 to 4 and Figure 14 , Figure 14 The sensing circuit may also include a connection switch SG that connects to the second input terminal of the first switch matrix SM1 and the second input terminal of the second switch matrix SM2.

[0158] According to Figure 14In this embodiment, switches SD01, SD02, SD03, SD04, SD05, and SD06 can be excluded, which are in Figure 5 In the sensing circuit, it can be called the second sensing reference voltage generation circuit.

[0159] Figure 14 The sensing circuit can use a single sensing reference voltage generating circuit, including switches SB01 to SB06, to provide sensing reference voltages to both the second input terminals of the first switch matrix SM1 and the second input terminals of the second switch matrix SM2. Therefore, the number of sensing reference voltage generating circuits can be reduced.

[0160] Referring to the comparative example, the sensing circuit may include multiple sensing amplifiers disposed at each sensing line. Due to deviations in the feedback capacitance of the sensing amplifiers, the sensing accuracy of the electrical characteristics of the pixel's switching elements may be reduced. Additionally, when an initialization voltage is applied to the sensing amplifier, a voltage difference may appear between the input terminals of the sensing amplifier due to the amplifier's offset. This voltage difference between the input terminals of the sensing amplifiers may further reduce the sensing accuracy of the electrical characteristics of the pixel's switching elements. When sensing accuracy decreases, the accuracy used to compensate for the electrical characteristics of the pixel's switching elements may also decrease, potentially degrading the display quality of the display panel.

[0161] According to embodiments of the present invention, the sensing circuit can use a first common sensing amplifier AE and a second common sensing amplifier AF disposed (e.g., connected to) an analog-to-digital converter (ADC) for multiple sensing lines to sense the electrical characteristics of the switching element of pixel P. By using the first common sensing amplifier AE and the second common sensing amplifier AF, the sensing circuit can prevent or reduce the reduction in sensing accuracy of the electrical characteristics of the switching element of pixel P due to deviations in the feedback capacitance of the sensing amplifier. Furthermore, it can prevent or reduce the reduction in sensing accuracy of the electrical characteristics of the switching element of pixel P due to voltage differences between the input terminals of the sensing amplifier caused by amplifier offsets.

[0162] The sensing circuit can use a first common sensing amplifier AE and a second common sensing amplifier AF for multiple sensing lines to sense the electrical characteristics of the switching element of pixel P, thereby improving sensing accuracy. Consequently, the accuracy of compensating for the electrical characteristics of the switching element of pixel P can be improved, thereby enhancing the display quality of the display panel 100.

[0163] In addition, the number of circuits that generate the sensing reference voltage can be reduced, thereby simplifying the sensing circuit.

[0164] As is customary in the field of this invention, embodiments are described and illustrated in the accompanying drawings according to functional blocks, units, and / or modules. Those skilled in the art will understand that these blocks, units, and / or modules are physically implemented as electronic (or optical) circuits formed using semiconductor-based or other manufacturing techniques, such as logic circuits, discrete components, microprocessors, hardwired circuits, memory elements, wiring connections, etc. Where blocks, units, and / or modules are implemented using microprocessors or the like, they can be programmed using software (e.g., microcode) to perform the various functions discussed herein and can be selectively driven by firmware and / or software. Alternatively, each block, unit, and / or module can be implemented using dedicated hardware or as a combination of dedicated hardware for performing some functions and a processor (e.g., one or more programmed microprocessors and associated circuitry) for performing other functions.

[0165] According to the embodiments of the sensing circuit and display device, sensing errors can be reduced, thereby improving the display quality of the display panel.

[0166] While the inventive concept has been specifically shown and described with reference to its embodiments, those skilled in the art will understand that various changes in form and detail may be made therein without departing from the spirit and scope of the inventive concept as defined by the following claims.

Claims

1. A sensing circuit for receiving sensing signals from a plurality of pixels of a display panel, the display panel including a plurality of sensing lines connected to the plurality of pixels, wherein, The sensing circuit includes: A first input selection circuit is connected to a first sensing line and a second sensing line, wherein the first sensing line and the second sensing line are connected to the plurality of sensing lines, and wherein the first input selection circuit is configured to apply a first sensing signal of the first sensing line to a first path setting circuit or apply a second sensing signal of the second sensing line to the first path setting circuit. The first path setting circuit is configured to set the path from the first sensing signal received from the first sensing line to the first switch matrix or the path from the second sensing signal received from the second sensing line to the first switch matrix; The second path setting circuit is configured to set the path from the first sensing reference voltage to the first switching matrix; The first switch matrix is ​​connected to the first path setting circuit and the second path setting circuit; The first mode setting circuit is connected to the first output terminal of the first switch matrix; A first common sensing amplifier is connected to the first mode setting circuit; The second mode setting circuit is connected to the second output terminal of the first switch matrix; A second common sensing amplifier is connected to the second mode setting circuit; and An analog-to-digital converter is connected to the output terminals of the first common sensing amplifier and the second common sensing amplifier. The first mode setting circuit includes: A first mode setting switch is connected between the first output terminal of the first switch matrix and the first input terminal of the first common sense amplifier; and A second mode setting switch is connected between the first output terminal of the first switch matrix and the first input terminal of the analog-to-digital converter. The second mode setting circuit includes: A third mode setting switch is connected between the second output terminal of the first switch matrix and the input terminal of the analog-to-digital converter; and A fourth mode setting switch is connected between the second output terminal of the first switch matrix and the first input terminal of the second common sense amplifier.

2. The sensing circuit according to claim 1, wherein, The sensing circuit further includes: First amplifier capacitor; and First amplifier switch, Each of the first amplifier capacitor and the first amplifier switch is connected between the first input terminal and the output terminal of the first common sensing amplifier. The first amplifier capacitor and the first amplifier switch are connected in parallel with each other.

3. The sensing circuit according to claim 1, wherein, The sensing circuit further includes: Amplifier capacitors; and Amplifier switch, Each of the amplifier capacitor and the amplifier switch is connected between the first input terminal and the output terminal of the second common sensing amplifier. The amplifier capacitor and the amplifier switch are connected in parallel with each other.

4. The sensing circuit according to claim 1, wherein, The first input selection circuit includes: A first input selection switch is connected between the first sensing line and the first input node; A second input selection switch is connected between the first sensing line and the initialization terminal; A third input selection switch is connected between the second sensing line and the first input node; and A fourth input selection switch is connected between the second sensing line and the initialization terminal.

5. The sensing circuit according to claim 1, wherein, The first path setting circuit includes a first path setting switch, a second path setting switch, a third path setting switch, a fourth path setting switch, and a first capacitor. The first path setting switch is connected between the first input node and the third path setting switch. The second path setting switch is connected between the first path setting switch and the fourth path setting switch. The third path setting switch is connected between the first path setting switch and the first capacitor, and The fourth path setting switch is connected between the first capacitor and the first switch matrix.

6. The sensing circuit according to claim 1, wherein, The second path setting circuit includes a first path setting switch, a second path setting switch, a third path setting switch, a fourth path setting switch, and a first capacitor. The first path setting switch is connected between the sensing reference voltage input node configured to receive the first sensing reference voltage and the second path setting switch. The second path setting switch is connected between the first path setting switch and the first capacitor. The third path setting switch is connected between the first path setting switch and the fourth path setting switch, and The fourth path setting switch is connected between the first capacitor and the first switch matrix.

7. The sensing circuit according to claim 6, wherein, The sensing circuit further includes: A first voltage selection circuit is configured to provide the first sensed reference voltage to the second path setting circuit. The first voltage selection circuit includes: A first voltage selection switch includes a first terminal configured to receive a second sensed reference voltage and a second terminal connected to the first path setting switch; and The second voltage selection switch includes a first terminal configured to receive a third sensing reference voltage and a second terminal connected to the first path setting switch.

8. The sensing circuit according to claim 1, wherein, The sensing circuit further includes: The first calibration circuit is connected to the first input selection circuit. The first calibration circuit is configured to output a calibration voltage to the first input node.

9. The sensing circuit according to claim 1, wherein, The sensing circuit further includes: The second input selection circuit is connected to the third and fourth sensing lines; The third path setting circuit is configured to set the path of the third sensing signal received from the third sensing line or the path of the fourth sensing signal received from the fourth sensing line. The fourth path setting circuit is configured to set the path of the first sensing reference voltage; and The second switch matrix is ​​connected to the third path setting circuit, the fourth path setting circuit, and the first switch matrix.

10. The sensing circuit according to claim 9, wherein, The sensing circuit further includes: The first channel switching circuit is connected to the first path setting circuit and the fourth path setting circuit.

11. The sensing circuit according to claim 10, wherein, The first channel switching circuit includes: A first channel switching switch is connected between the first path setting circuit and the first channel switching node; A second channel switching switch is connected between the first node of the fourth path setting circuit and the first channel switching node; and The third channel switching switch is connected between the second node of the fourth path setting circuit and the first channel switching node.

12. The sensing circuit according to claim 9, wherein, The sensing circuit further includes: The channel switching circuit connects the second path setting circuit and the third path setting circuit.

13. The sensing circuit according to claim 12, wherein, The channel switching circuit includes: The first channel switching switch is connected between the first node of the second path setting circuit and the channel switching node; A second channel switching switch is connected between the second node of the second path setting circuit and the channel switching node; and The third channel switching switch is connected between the third path setting circuit and the channel switching node.

14. A display device, wherein, The display device includes: A display panel is configured to display an image based on an input image, and includes multiple data lines, multiple sensing lines, and multiple pixels connected to the multiple data lines and the multiple sensing lines; and The readout chip is configured to receive a sensing signal through at least one of the plurality of sensing lines and output a data voltage compensated based on the sensing signal to at least one of the plurality of data lines. The readout chip includes: A first input selection circuit is connected to a first sensing pad and a second sensing pad, wherein the first sensing pad and the second sensing pad are connected to the plurality of sensing lines, and wherein the first input selection circuit is configured to apply a first sensing signal of the first sensing pad to a first path setting circuit or apply a second sensing signal of the second sensing pad to the first path setting circuit. The first path setting circuit is configured to set the path from the first sensing signal received from the first sensing pad to the first switch matrix or the path from the second sensing signal received from the second sensing pad to the first switch matrix; The second path setting circuit is configured to set the path from the sensing reference voltage to the first switching matrix; The first switch matrix is ​​connected to the first path setting circuit and the second path setting circuit; The first mode setting circuit is connected to the first output terminal of the first switch matrix; A first common sensing amplifier is connected to the first mode setting circuit; The second mode setting circuit is connected to the second output terminal of the first switch matrix; A second common sensing amplifier is connected to the second mode setting circuit; and An analog-to-digital converter is connected to the output terminals of the first common sensing amplifier and the second common sensing amplifier. The first mode setting circuit includes: A first mode setting switch is connected between the first output terminal of the first switch matrix and the first input terminal of the first common sense amplifier; and A second mode setting switch is connected between the first output terminal of the first switch matrix and the first input terminal of the analog-to-digital converter. The second mode setting circuit includes: A third mode setting switch is connected between the second output terminal of the first switch matrix and the input terminal of the analog-to-digital converter; and A fourth mode setting switch is connected between the second output terminal of the first switch matrix and the first input terminal of the second common sense amplifier.

15. The display device according to claim 14, wherein, In single-sensor mode, the first sensing signal of the first sensing pad is applied to the first input terminal of the analog-to-digital converter via the first common sensing amplifier, and the sensing reference voltage is applied to the second input terminal of the analog-to-digital converter.

16. The display device according to claim 14, wherein, In differential sensing mode, the first sensing signal of the first sensing pad is applied to the first input terminal of the analog-to-digital converter via the first common sensing amplifier, and the third sensing signal of the third sensing pad is applied to the second input terminal of the analog-to-digital converter via the second common sensing amplifier.

17. The display device according to claim 14, wherein, In the amplifierless mode, the first sensing signal of the first sensing pad is applied to the first input terminal of the analog-to-digital converter via a first path that bypasses the first common sensing amplifier in the first mode setting circuit, and the sensing reference voltage is applied to the second input terminal of the analog-to-digital converter via a second path that bypasses the second common sensing amplifier in the second mode setting circuit.

Images