Display device and pixel driving method thereof

Abstract

The invention discloses a display device and a pixel driving method thereof. The display device includes a pixel array, a source driver, a sensing circuit, a computing circuit, and a switching circuit. The pixel array has a plurality of pixel circuits and a plurality of source lines coupled to the pixel circuits, wherein each pixel circuit has a light emitting element and a driving transistor located on a current path. The switching circuit couples the source lines to one of the source driver and the sensing circuit. In the sensing mode, the sensing circuit senses the conduction current of the driving transistor in each pixel circuit to provide sensing voltage, and the calculation circuit judges the critical voltage offset and carrier mobility attenuation of the driving transistor in each pixel circuit based on the sensing voltage to correct the data voltage provided by the source driver.

Description

Technical Field

[0001] The present invention relates to a display device, and in particular to a self-luminous display device and a pixel driving method thereof. Background Art

[0002] Micro LED technology, with its advantages of high brightness, low power consumption, high resolution and long life, is expected to gradually replace traditional display technology in the future and be widely used in various products. In a micro LED pixel circuit, the brightness and light-emitting time of the micro LED are controlled by multiple transistors. However, after long-term use, the performance of the transistors in the micro LED pixel circuit will be affected by the continuous component deterioration (Stress) during subsequent use, which will lead to variations in the critical voltage (Vth) and carrier mobility (mobility), resulting in abnormal display of the micro LED pixel circuit. Summary of the invention

[0003] The present invention provides a display device and a pixel driving method thereof, which can sense the variation of the threshold voltage (Vth) and carrier mobility (mobility) of a driving transistor on a current path and compensate for it by adjusting / correcting the data voltage.

[0004] The display device of the present invention includes a pixel array, a source driver, a sensing circuit, a calculation circuit, and a switch circuit. The pixel array has a plurality of pixel circuits and a plurality of source lines, wherein the pixel circuits are coupled to the source lines, and each pixel circuit has a light-emitting element and a driving transistor located on a current path. The source driver is used to provide a plurality of data voltages. The sensing circuit is used to provide a plurality of sensing voltages. The calculation circuit is coupled to the sensing circuit and the source driver, and in a sensing mode, the critical voltage offset and the carrier mobility attenuation of the driving transistor in each pixel circuit are determined based on the sensing voltages to correct these data voltages. The switch circuit is coupled between the source lines, the source driver, and the sensing circuit, and receives a sensing switch signal to couple the source lines to one of the source driver and the sensing circuit based on the sensing switch signal. In the sensing mode, the source lines are alternately coupled to the source driver and the sensing circuit, and the sensing circuit senses the conduction current of the driving transistor in each pixel circuit to provide the sensing voltages.

[0005] The pixel driving method of the display device of the present invention comprises a plurality of pixel circuits, each pixel circuit having a light-emitting element and a driving transistor located on a current path, and the pixel driving method comprises the following steps. In a sensing mode, a plurality of data voltages are provided to the pixel circuits via a source driver, and the on-current of the driving transistor in each pixel circuit is sensed via a sensing circuit to provide the sensing voltages. The critical voltage offset and the carrier mobility attenuation of the driving transistor in each pixel circuit are determined based on the sensing voltages via a calculation circuit to correct the data voltages.

[0006] Based on the above, in the display device and the pixel driving method thereof according to the embodiment of the present invention, when the display device operates in the sensing mode, the source line is alternately coupled to the source driver and the sensing circuit, so that the voltage level of the control terminal of the driving transistor in each pixel circuit is set by the source driver, and the on-current of the driving transistor in each pixel circuit is sensed by the sensing circuit. Therefore, through the change of the voltage level of the control terminal of the driving transistor in each pixel circuit and the change of the on-current of the driving transistor, the variation of the critical voltage and the carrier mobility of the driving transistor on the current path can be sensed, so that compensation can be performed by adjusting / correcting the data voltage.

[0007] In order to make the above features and advantages of the present invention more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 FIG. 4 is a system diagram of a display device according to an embodiment of the present invention.

[0009] Figure 2 FIG. 1 is a schematic diagram of an equivalent circuit in which a pixel circuit of a display device is coupled to a source driver and a sensing circuit via a switch circuit according to an embodiment of the present invention.

[0010] Figure 3 FIG. 1 is a schematic diagram of driving waveforms of a pixel circuit of a display device operating in a sensing mode according to an embodiment of the present invention.

[0011] Figure 4A FIG. 1 is a schematic diagram of an equivalent circuit in which a pixel circuit of a display device is coupled to a source driver via a switch circuit according to an embodiment of the present invention.

[0012] Figure 4B FIG. 4 is a schematic diagram of an equivalent circuit in which a pixel circuit of a display device is coupled to a sensing circuit via a switch circuit according to an embodiment of the present invention.

[0013] Figure 4C FIG. 4 is a schematic diagram of a voltage waveform of a sensing voltage of a display device according to an embodiment of the present invention.

[0014] Figure 5 FIG. 1 is a schematic diagram of driving waveforms of a pixel circuit of a display device operating in a display mode according to an embodiment of the present invention.

[0015] Figure 6 FIG. 4 is a flowchart of a pixel driving method of a display device according to an embodiment of the present invention.

[0016] Description of reference numerals:

[0017] 100: Display device

[0018] 110: Timing controller

[0019] 120: Source driver

[0020] 130: Scan driver

[0021] 140: Pixel Array

[0022] 150: Light Emitting Driver

[0023] 160: Switching Circuit

[0024] 170: Sensing circuit

[0025] 170a: Sub-sensing circuit

[0026] 180: Computational Circuits

[0027] BP: Vertical Blank Period

[0028] C1, C2: capacitors

[0029] EM, EM[1]: Luminescent signal

[0030] Frame(M), Frame(N), Frame(N+1): frame duration

[0031] HP: Horizontal scanning period

[0032] Iph: current path

[0033] LD1: Micro Light Emitting Diode

[0034] Lsrc: source line

[0035] PX: Pixel circuit

[0036] R1: Resistor

[0037] SCAN, SEN[1]: Scan signal

[0038] SEN, SEN[1]: sensing signal

[0039] SH: Sense hold signal

[0040] SIO_SRT: Sense reset signal

[0041] SIO_V: sensing voltage

[0042] SSE: Sense switch signal

[0043] SWa: Switch

[0044] T1~T7: Transistor

[0045] Vdata (sen) : Sensing data voltage

[0046] Vdata, Vdata[1]: data voltage

[0047] Vdata_new: corrected data voltage

[0048] VDD: system high voltage

[0049] VREF: First reference voltage

[0050] VREF2: Second reference voltage

[0051] VSS: System low voltage

[0052] S110, S120: Steps DETAILED DESCRIPTION

[0053] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and the present invention, and will not be interpreted as an idealized or overly formal meaning unless explicitly defined as such herein.

[0054] It should be understood that although the terms "first", "second", "third", etc. can be used to describe various elements, components, regions, layers and / or parts in this article, these elements, components, regions, and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, the "first element", "component", "region", "layer" or "part" discussed below can be referred to as a second element, component, region, layer or part without departing from the teachings of this article.

[0055] The terms used herein are only for the purpose of describing specific embodiments and are not restrictive. As used herein, unless the content clearly indicates, the singular forms "one", "an" and "the" are intended to include plural forms, including "at least one". "Or" means "and / or". As used herein, the term "and / or" includes any and all combinations of one or more related listed items. It should also be understood that when used in this specification, the terms "include" and / or "include" specify the presence and / or parts of the features, regions, entireties, steps, operations, elements, but do not exclude the presence or addition of one or more other features, regions, entireties, steps, operations, elements, parts and / or their combinations.

[0056] Figure 1 is a system diagram of a display device according to an embodiment of the present invention. Figure 1 In this embodiment, the display device 100 includes a timing controller 110, a source driver 120, a scan driver 130, a pixel array 140, a light emitting driver 150, a switch circuit 160, a sensing circuit 170, and a calculation circuit 180. The pixel array 140 has a plurality of pixel circuits PX and a plurality of source lines Lsrc, wherein the pixel circuits PX are coupled to the source lines Lsrc, and each pixel circuit PX has a light emitting element (e.g., a micro light emitting diode LD1) and a driving transistor (e.g., a transistor T1) located on a current path Iph.

[0057] The source driver 120 is coupled to the timing controller 110 to provide a plurality of data voltages Vdata under the control of the timing controller 110. The scan driver 130 is coupled to the timing controller 110 and the pixel array 140 to provide a plurality of scan signals SCAN and a plurality of sensing signals SEN to the pixel array 140 under the control of the timing controller 110. The light driver 150 is coupled to the timing controller 110 and the pixel array 140 to provide a plurality of light emitting signals EM to the pixel array 140 under the control of the timing controller 110.

[0058] The switch circuit 160 is coupled between the source line Lsrc, the source driver 120, and the sensing circuit 170, and receives the sensing switch signal SSE to couple the source line Lsrc to one of the source driver 120 and the sensing circuit 170 based on the sensing switch signal SSE. When the switch circuit 160 couples the source line Lsrc to the source driver 120, the data voltage Vdata is transmitted to the source line Lsrc via the switch circuit 160. When the switch circuit 160 couples the source line Lsrc to the sensing circuit 170, the sensing circuit 170 senses the on-current of the driving transistor in each pixel circuit PX to provide a plurality of sensing voltages SIO_V.

[0059] The calculation circuit 180 (e.g., a microcontroller (MCU)) is coupled to the sensing circuit 170 and the source driver 120. In the sensing mode, the source line Lsrc is alternately coupled to the source driver 120 and the sensing circuit 170, and the sensing circuit 170 provides a sensing voltage SIO_V in response to the sensing result. Then, the calculation circuit 180 determines the threshold voltage (Vth) offset and carrier mobility attenuation of the driving transistor in each pixel circuit PX based on these sensing voltages SIO_V, and provides a corrected data voltage Vdata_new to the source driver 120 to correct these data voltages Vdata. In the sensing process, the calculation circuit 180 can provide the sensing data voltage Vdata (sen) To the source driver 120, to control the source driver 120 to provide the data voltage Vdata required for sensing.

[0060] According to the above, when the display device 100 operates in the sensing mode, the source line Lsrc is alternately coupled to the source driver 120 and the sensing circuit 170, so that the voltage level of the control terminal of the driving transistor in each pixel circuit PX is set by the source driver 120, and the on-current of the driving transistor in each pixel circuit PX is sensed by the sensing circuit 170. Therefore, through the change of the voltage level of the control terminal of the driving transistor in each pixel circuit PX and the change of the on-current of the driving transistor, the variation of the threshold voltage and carrier mobility of the driving transistor on the current path can be sensed, and thus compensation can be performed by adjusting / correcting the data voltage.

[0061] In the display mode, the source line Lsrc is fixedly coupled to the source driver 120, and the data voltage Vdata is written into (or stored in) a storage capacitor (eg, capacitor C1) in each pixel circuit PX to control the light emitting brightness of the light emitting element in each pixel circuit PX.

[0062] In this embodiment, each pixel circuit PX includes a micro light emitting diode LD1, a capacitor C1 (corresponding to the first capacitor), and transistors T1 to T5 (corresponding to the first transistor to the fifth transistor), wherein the transistors T1 to T5 are P-type transistors. The micro light emitting diode LD1 has an anode receiving a system high voltage VDD and a cathode. The transistor T1 is used as a driving transistor and has a first terminal coupled to the cathode of the micro light emitting diode LD1, a control terminal, and a second terminal.

[0063] The capacitor C1 is coupled between the cathode of the micro-light emitting diode LD1 and the control terminal of the transistor T1. The transistor T2 has a first terminal coupled to the second terminal of the transistor T1, a control terminal receiving a corresponding one of the luminous signals EM, and a second terminal receiving the system low voltage VSS. The transistor T3 has a first terminal coupled to the cathode of the micro-light emitting diode LD1, a control terminal receiving a corresponding one of the scanning signals SCAN, and a second terminal receiving the first reference voltage VREF.

[0064] The transistor T4 has a first end coupled to a corresponding one of the source lines Lsrc, a control end receiving a corresponding one of the scan signals SCAN, and a second end coupled to the control end of the transistor T1. The transistor T5 has a first end coupled to a corresponding one of the source lines Lsrc, a control end receiving a corresponding one of the sensing signals SEN, and a second end coupled to the cathode of the micro light emitting diode LD1.

[0065] Figure 2 FIG. 1 is a schematic diagram of an equivalent circuit of a pixel circuit of a display device according to an embodiment of the present invention coupled to a source driver and a sensing circuit via a switch circuit. Figure 1 as well as Figure 2 In the present embodiment, the switch circuit 160 includes a plurality of switches SWa controlled by a sensing switch signal SSE, and each switch SWa has a common connection terminal coupled to a corresponding one of the source lines Lsrc, a first connection terminal coupled to the source driver 120, and a second connection terminal coupled to the sensing circuit 170, wherein each source line Lsrc forms an equivalent capacitance between the system low voltage VSS in addition to the line impedance.

[0066] In the present embodiment, the sensing circuit 170 includes a plurality of sub-sensing circuits 170a, and each sub-sensing circuit 170a includes a transistor T6 (corresponding to the sixth transistor), a transistor T7 (corresponding to the seventh transistor), a resistor R1 (corresponding to the first resistor), and a capacitor C2 (corresponding to the second capacitor), wherein the transistors T6 and T7 are N-type transistors as an example. The transistor T6 has a first end coupled to the second connection end, a control end receiving a sensing reset signal SIO_SRT, and a second end receiving a second reference voltage VREF2. The transistor T7 has a first end coupled to the second connection end, a control end receiving a sensing hold signal SH, and a second end. The resistor R1 is coupled between the second end of the transistor T7 and the sensing voltage SIO_V. The capacitor C2 is coupled between the sensing voltage SIO_V and the system low voltage VSS.

[0067] In the embodiment of the present invention, after streamlining the pixel circuit PX, the design of grouping and merging the terminals receiving the system low voltage VSS in the pixel circuit PX can further improve the aperture ratio, for example, reduce the transparency difference by 1%.

[0068] Figure 3 FIG. 1 is a schematic diagram of driving waveforms of a pixel circuit of a display device operating in a sensing mode according to an embodiment of the present invention. Figure 4A FIG. 1 is a schematic diagram of an equivalent circuit in which a pixel circuit of a display device is coupled to a source driver via a switch circuit according to an embodiment of the present invention. Figure 4B FIG. 4 is a schematic diagram of an equivalent circuit in which a pixel circuit of a display device is coupled to a sensing circuit via a switch circuit according to an embodiment of the present invention. Figure 4C FIG. 1 is a schematic diagram of a voltage waveform of a sensing voltage of a display device according to an embodiment of the present invention. Figures 1 to 4C In the present embodiment, it is assumed that the display device 100 operates in the sensing mode, wherein BP represents a vertical blank period and HP represents a horizontal scanning period.

[0069] In the sensing mode, during the frame period Frame (N) (corresponding to the first frame period), the common connection terminal of the switch SWa is connected to the first connection terminal. At this time, the scan signal SCAN[1] (e.g., the first scan signal) is at a low voltage level (i.e., an enabled state), the sensing signal SEN[1] (e.g., the first sensing signal) is at a high voltage level (i.e., a disabled state), the light emitting signal EM[1] (e.g., the first light emitting signal) is at a high voltage level (i.e., a disabled state), the sensing reset signal SIO_SRT is at a low voltage level (i.e., a disabled state), and the sensing hold signal SH is at a low voltage level (i.e., a disabled state), wherein N is a positive integer greater than 0. In addition, the voltage difference between the data voltage Vdata[1] (e.g., the first data voltage) and the first reference voltage VREF is used to set the voltage level of the control terminal of the transistor T1, i.e., to set the gate-source voltage Vgs of the transistor T1.

[0070] Then, in the frame period Frame(N+1) (corresponding to the second frame period) of the continuation frame period Frame(N), the common connection terminal of the switch SWa is connected to the second connection terminal. At this time, the scan signal SCAN[1] is at a high voltage level (i.e., in a disabled state), the sensing signal SEN[1] is at a low voltage level (i.e., in an enabled state), the light emitting signal EM[1] is at a high voltage level (i.e., in a disabled state), the sensing reset signal SIO_SRT is at a high voltage level (i.e., in an enabled state), and the sensing hold signal SH is at a high voltage level (i.e., in an enabled state). In addition, the cross voltage of the second capacitor C2 is set with the second reference voltage VREF2, that is, the sensing voltage SIO_V is charged to the second reference voltage VREF2.

[0071] After the voltage across the second capacitor C2 is set (i.e., after the sensing voltage SIO_V is charged to the second reference voltage VREF2), the scan signal SCAN[1] is disabled, the sensing signal SEN[1] is enabled, the light emitting signal EM[1] is enabled, the sensing reset signal SIO_SRT is disabled, and the sensing hold signal SH is enabled to connect transistors T1, T2, T5, and T7 in series, so that the voltage level of the sensing voltage SIO_V can decrease in response to the on-current of the transistor T1, thereby sensing the on-current of the transistor T1.

[0072] To go a step further, based on the current formula, the current for different gate-source voltages Vgs is as follows:

[0073]

[0074]

[0075] Based on the above formulas (1) and (2), it can be simplified to the following relationship:

[0076]

[0077] Among them, the current I vg1 and I vg2 is the on-state current of the driving transistor with different gate-source voltages Vgs in each pixel circuit PX, which can be realized by writing different data voltages Vdata, and the calculation circuit 180 can calculate the current I based on the slope of the corresponding one of the sensing voltages SIO_V (ie, ΔV / ΔT). vg1 and I vg2 Then, according to the calculated current I vg1 and I vg2 , the calculation circuit 180 can calculate the initial threshold voltage Vth based on formula (3): (Initial) The value of the initial time T0 (ie, the initial value / factory value), and the initial threshold voltage Vth (Initial) The information may be recorded in a storage device inside or outside the timing controller 110 / computing circuit 180 .

[0078] Similarly, at the time point T after the initial time T0, the stress calculation is performed stress When the calculation circuit 180 performs subsequent calculations based on formula (3), the offset threshold voltage Vth of the driving transistor of each pixel circuit PX is calculated. (stress) After calculating the offset threshold voltage Vth (stress) The calculation circuit 180 can calculate the initial threshold voltage Vth of the driving transistor of each pixel circuit PX based on the initial threshold voltage Vth of the driving transistor of each pixel circuit PX. (Initial) And the offset threshold voltage Vth (stress)Calculate the sensing data voltage Vdata of each pixel circuit PX (sen) , where Vdata (Initial) +(Vth (stress) -Vth (Initial) )=Vdata (sen) , and Vdata (Initial) is the original data voltage corresponding to each grayscale brightness.

[0079] After calculating the sensing data voltage Vdata (sen) After that, the calculation circuit 180 may calculate the sensing data voltage Vdata based on the driving transistor of each pixel circuit PX. (sen) The correction on-current I of the driving transistor of each pixel circuit PX is sensed. ref , that is, using the sensing data voltage Vdata (sen) The voltage level of the control terminal of the driving transistor is set, and the correction conduction current I is calculated according to the slope of the corresponding one of the sensing voltages SIO_V (ie, ΔV / ΔT). ref .

[0080] After calculating the correction conduction current I ref After that, the calculation circuit 180 can calculate the correction conduction current I of the driving transistor of each pixel circuit PX based on the correction conduction current I ref Calculate the current correction value α of each pixel circuit PX, where And I ini Finally, after calculating the current correction value α, the calculation circuit 180 can calculate the current correction value α of each pixel circuit PX and the offset threshold voltage Vth. (stress) Calculate a plurality of corrected data voltages Vdata_new of each pixel circuit PX, where Vdata_new=α×(Vdata_old-Vth (sen,Initial) -VREF)+VREF+Vth (sen,stress) , where Vdata_old is the original data voltage, and the initial threshold voltage Vth (sen,Initial) And the offset threshold voltage Vth (sen,stress) The sensing data voltage Vdata is used (sen) Calculated by sensing.

[0081] Figure 5 FIG. 1 is a schematic diagram of driving waveforms of a pixel circuit of a display device operating in a display mode according to an embodiment of the present invention. Figure 1 , Figure 2 , Figure 4A and Figure 5In the present embodiment, it is assumed that the display device operates in a display mode, wherein BP represents a vertical blank period and HP represents a horizontal scan period. In the frame period Frame (M) (corresponding to the third frame period), the source line Lsrc is fixedly coupled to the source driver 120. In addition, the scan signal SCAN[1] is enabled, the sensing signal SEN[1] is disabled, the light emission signal EM[1] is disabled, the sensing reset signal SIO_SRT is disabled, and the sensing maintenance signal SH is disabled, wherein M is a positive integer greater than 0. In addition, the voltage difference between the data voltage Vdata[1] (e.g., the first data voltage) and the first reference voltage VREF is used to set the voltage level of the control terminal of the transistor T1, that is, to set the gate-source voltage Vgs of the transistor T1.

[0082] After the voltage across the first capacitor C1 is set, the scan signal SCAN[1] is disabled, the sensing signal SEN[1] is disabled, the light emitting signal EM[1] is enabled, the sensing reset signal SIO_SRT is disabled, and the sensing sustain signal SH is disabled, so that the micro light emitting diode LD1 emits light corresponding to the data voltage Vdata[1].

[0083] Figure 6 FIG. 1 is a flowchart of a pixel driving method of a display device according to an embodiment of the present invention. Figure 6 In the present embodiment, the display device has a plurality of pixel circuits, and each pixel circuit has a light-emitting element and a driving transistor located on a current path, and the pixel driving method includes the following steps. In step S110, in a sensing mode, a plurality of data voltages are provided to these pixel circuits via a source driver, and the on-current of the driving transistor in each pixel circuit is sensed via a sensing circuit to provide these sensing voltages. In step S120, the critical voltage offset and the carrier mobility attenuation of the driving transistor in each pixel circuit are determined based on these sensing voltages via a calculation circuit to correct these data voltages. Among them, the steps of steps S110 and S120 are for illustration only, and the embodiments of the present invention are not limited thereto. In addition, the details of steps S110 and S120 can be referred to. Figures 1 to 5 The embodiments are shown in the embodiment, which will not be repeated here.

[0084] In summary, in the display device and the pixel driving method thereof according to the embodiment of the present invention, when the display device operates in the sensing mode, the source line is alternately coupled to the source driver and the sensing circuit, so that the voltage level of the control terminal of the driving transistor in each pixel circuit is set by the source driver, and the on-current of the driving transistor in each pixel circuit is sensed by the sensing circuit. Therefore, through the change of the voltage level of the control terminal of the driving transistor in each pixel circuit and the change of the on-current of the driving transistor, the variation of the critical voltage and the carrier mobility of the driving transistor on the current path can be sensed, and thus compensation can be performed by adjusting / correcting the data voltage.

[0085] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some changes and modifications without departing from the concept and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the claims.

Claims

1. A display device, comprising: A pixel array having a plurality of pixel circuits and a plurality of source lines, wherein the pixel circuits are coupled to the source lines, and each of the pixel circuits has a light emitting element and a driving transistor located on a current path; a source driver for providing a plurality of data voltages; A sensing circuit for providing a plurality of sensing voltages; a calculation circuit coupled to the sensing circuit and the source driver, and in a sensing mode, determining a threshold voltage shift and a carrier mobility attenuation of the driving transistor in each of the pixel circuits based on the sensing voltages to correct the data voltages; a switch circuit coupled between the source lines, the source driver and the sensing circuit, and receiving a sensing switch signal to couple the source lines to one of the source driver and the sensing circuit based on the sensing switch signal, In the sensing mode, the source lines are alternately coupled to the source driver and the sensing circuit, and the sensing circuit senses a conduction current of the driving transistor in each of the pixel circuits to provide the sensing voltages.

2. A display device as described in claim 1, wherein the switching circuit includes a plurality of switches controlled by the sensing switch signal, and each of the switches has a common connection terminal coupled to a corresponding one of the source lines, a first connection terminal coupled to the source driver, and a second connection terminal coupled to the sensing circuit.

3. The display device as claimed in claim 2, wherein each of the pixel circuits comprises: The light emitting element has an anode receiving a system high voltage and a cathode; a first transistor, serving as the driving transistor, having a first terminal coupled to the cathode of the light emitting element, a control terminal, and a second terminal; a first capacitor coupled between the cathode coupled to the light emitting element and the control terminal of the first transistor; a second transistor having a first end coupled to the second end of the first transistor, a control end receiving a light emitting signal, and a second end receiving a system low voltage; a third transistor having a first terminal coupled to the cathode of the light emitting element, a control terminal receiving a scan signal, and a second terminal receiving a first reference voltage; a fourth transistor having a first end coupled to a corresponding one of the source lines, a control end receiving the scan signal, and a second end coupled to the control end of the first transistor; and A fifth transistor has a first end coupled to a corresponding one of the source lines, a control end receiving a sensing signal, and a second end coupled to the cathode of the light emitting element.

4. The display device as claimed in claim 3, wherein the sensing circuit comprises a plurality of sub-sensing circuits, and each of the sub-sensing circuits comprises: a sixth transistor having a first terminal coupled to the second connection terminal, a control terminal receiving a sensing reset signal, and a second terminal receiving a second reference voltage; a seventh transistor having a first terminal coupled to the second connection terminal, a control terminal receiving a sensing maintenance signal, and a second terminal; a first resistor coupled between the second terminal of the seventh transistor and the sensing voltage; and A second capacitor is coupled between the sensing voltage and the system low voltage.

5. The display device as claimed in claim 4, wherein in the sensing mode, during a first frame period, the scanning signal is enabled to set a voltage across the first capacitor according to a voltage difference between a corresponding one of the data voltages and the first reference voltage, In a second frame period continuing the first frame period, the sensing signal, the sensing reset signal, and the sensing maintaining signal are enabled to set a voltage across the second capacitor with the second reference voltage, and After setting the cross voltage of the second capacitor, the sensing signal, the light emitting signal and the sensing maintaining signal are enabled to sense the on-current of the first transistor.

6. The display device as claimed in claim 5, wherein the calculation circuit calculates the on-current of the driving transistor of each of the pixel circuits based on the slope of a corresponding one of the sensing voltages, calculating an offset threshold voltage of the driving transistor of each of the pixel circuits based on a corresponding one of the data voltages and the on-current of the driving transistor of each of the pixel circuits, calculating a sensing data voltage of each of the pixel circuits based on the offset threshold voltage of the driving transistor of each of the pixel circuits, sensing a correction conduction current of the driving transistor of each of the pixel circuits based on the sensing data voltage of the driving transistor of each of the pixel circuits, calculating a current correction value of each of the pixel circuits based on the correction conduction current of the driving transistor of each of the pixel circuits, and A plurality of corrected data voltages of each of the pixel circuits are calculated based on the current correction value and the offset threshold voltage of each of the pixel circuits.

7. The display device as claimed in claim 4, wherein in a display mode, the source lines are fixedly coupled to the source driver, In a third frame period, the scan signal is enabled to set a voltage across the first capacitor according to a voltage difference between a corresponding one of the data voltages and the first reference voltage, and After the voltage is set by the first capacitor, the light emitting signal is enabled to make the light emitting element emit light. 8 . The display device as claimed in claim 3 , wherein a plurality of endpoints in the pixel circuits that receive the system low voltage are grouped and combined.

9. The display device as claimed in claim 1, wherein the light emitting element comprises a micro light emitting diode.

10. A pixel driving method of a display device, the display device having a plurality of pixel circuits, each of which has a light emitting element and a driving transistor located on a current path, the method comprising: In a sensing mode, a plurality of data voltages are provided to the pixel circuits via a source driver, and a conduction current of the driving transistor in each of the pixel circuits is sensed via a sensing circuit to provide the sensing voltages; and A threshold voltage shift and a carrier mobility attenuation of the driving transistor in each of the pixel circuits are determined based on the sensing voltages by a calculation circuit to correct the data voltages.

11. The pixel driving method according to claim 10, further comprising: In the sensing mode, during a first frame period, a control terminal of the driving transistor in each of the pixel circuits is set to a corresponding one of the data voltages; In a second frame period continuing the first frame period, each of the sensing voltages is set with a reference voltage; as well as After setting the sensing voltages, the sensing signal, the light emitting signal and the sensing maintaining signal are enabled to sense the conduction current of the driving transistor.

12. The pixel driving method according to claim 11, further comprising: Calculating the on-current of the driving transistor of each of the pixel circuits based on the slope of a corresponding one of the sensing voltages by the calculation circuit; Calculating, by the calculation circuit, an offset threshold voltage of the driving transistor of each of the pixel circuits based on a corresponding one of the data voltages and the on-current of the driving transistor of each of the pixel circuits; Calculating a sensing data voltage of each of the pixel circuits based on the offset threshold voltage of the driving transistor of each of the pixel circuits by the calculation circuit; sensing a correction conduction current of the driving transistor of each of the pixel circuits based on the sensing data voltage of the driving transistor of each of the pixel circuits through the calculation circuit; Calculating a current correction value of each of the pixel circuits based on the correction conduction current of the driving transistor of each of the pixel circuits by the calculation circuit; as well as The calculation circuit calculates a plurality of corrected data voltages of each of the pixel circuits based on the current correction value and the offset threshold voltage of each of the pixel circuits.

13. The pixel driving method according to claim 10, further comprising: In a display mode, during a third frame period, a control terminal of the driving transistor in each of the pixel circuits is set to a corresponding one of the data voltages; and After the control terminal of the driving transistor is set, the light emitting element is made to emit light.

14. The pixel driving method as claimed in claim 10, wherein the light emitting element comprises a micro light emitting diode.

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