Pixel sensing device and panel driving device

Abstract

The present invention relates to a pixel sensing device and a panel driving device, embodiments relate to a technique for driving a display device, and provides a technique for adjusting a full scale range (FSR) of an analog-to-digital converter according to a mode when a pixel is sensed.

Description

Technical Field

[0001] This embodiment relates to a technology for driving display devices. Background Technology

[0002] The display device includes a source driver for driving pixels disposed on a panel.

[0003] The source driver determines the data voltage based on the image data and supplies the data voltage to the pixels, thereby controlling the brightness of each pixel.

[0004] On the other hand, even when the same data voltage is supplied, the brightness of each pixel may vary depending on the pixel's characteristics. For example, a pixel includes a driving transistor, and if the threshold voltage of the driving transistor changes, the pixel's brightness will change even if the same data voltage is supplied to it. If the source driver fails to account for such changes in pixel characteristics, the following problems may occur: pixels exhibit undesirable brightness when driven and image quality deteriorates.

[0005] Specifically, the characteristics of a pixel change over time or depending on its surrounding environment. If the source driver supplies data voltage without taking into account the changed characteristics of the pixel, image quality degradation (e.g., blurry image) occurs.

[0006] To mitigate such problematic degradation of image quality, the display device may include a pixel sensing device for sensing the characteristics of pixels.

[0007] A pixel sensing device receives analog signals related to each pixel via sensing lines connected to each pixel. The pixel sensing device converts the analog signals into pixel sensing data and transmits this data to a timing controller. The timing controller then identifies the characteristics of each pixel based on the pixel sensing data. By reflecting the characteristics of each pixel, the timing controller compensates for image data, thereby mitigating problematic image quality degradation caused by inter-pixel deviations.

[0008] The pixel sensing device can sense the characteristics of pixels during periods when the panel is not driven. For example, the pixel sensing device can sense the characteristics of pixels during the V-Blank (vertical blanking) segment when the panel is not driven within a single frame. Additionally, the pixel sensing device can sense the characteristics of pixels when panel driving is stopped after receiving a system-related shutdown signal.

[0009] However, because the latter time period is relatively long while the former is relatively short, the impact of noise can become more severe in pixel feature sensing. Severe noise leads to errors in the sensed values, and compensation processing can adversely increase pixel deviation. This can result in image quality degradation. Summary of the Invention

[0010] In this context, one aspect of this embodiment provides a technique for sensing pixel characteristics while minimizing the impact of noise. Another aspect of this embodiment provides a technique for reducing the impact of noise when sensing pixel characteristics over a relatively short time period. Yet another aspect of this embodiment provides a technique for improving sensing accuracy when sensing pixel characteristics over a relatively long time period. A further aspect of this embodiment provides a technique for adjusting the impact of noise and sensing accuracy based on the length of the sensing segment.

[0011] In one aspect, this embodiment provides a pixel sensing device for sensing the characteristics of pixels disposed on a display panel. The pixel sensing device includes: an analog circuit configured to obtain a characteristic voltage of a pixel; an analog-to-digital converter configured to convert the characteristic voltage into digital data and change the full range (FSR) according to a mode; and a digital processing circuit configured to generate pixel sensing data based on the digital data.

[0012] The FSR voltage can include a positive FSR voltage and a negative FSR voltage. The control circuit can select and output a positive FSR voltage from a plurality of positive FSR voltages according to a control signal for a specific mode, and can also select and output a negative FSR voltage from a plurality of negative FSR voltages.

[0013] In the first mode, the sensing segment can be formed within a vertical blanking segment of a frame, and in the second mode, the sensing segment can be formed after the system's shutdown signal.

[0014] In another embodiment, this embodiment provides an apparatus for driving a panel, wherein pixels are disposed on the panel, and data lines and sensing lines connected to the pixels are provided. The panel driving apparatus includes: a data driving circuit configured to convert image data into a data voltage and supply the data voltage to the data lines; a data processing circuit configured to compensate the image data using pixel sensing data corresponding to the characteristics of the pixels; and a pixel sensing circuit including an analog circuit and an analog-to-digital converter, wherein the analog circuit is configured to obtain the characteristic voltage of the pixel, the analog-to-digital converter is configured to convert the characteristic voltage into digital data and change the full range (FSR) according to a mode, and the pixel sensing circuit is configured to generate the pixel sensing data based on the digital data.

[0015] The pixel sensing circuit can sense the pixel in a vertical blanking segment of a frame in a first mode, and can sense the pixel after the system's shutdown signal in a second mode.

[0016] As described above, according to this embodiment, pixel characteristics can be sensed while minimizing the impact of noise. Furthermore, according to this embodiment, the impact of noise can be reduced when sensing pixel characteristics over a relatively short time period. Additionally, according to this embodiment, the sensing accuracy can be improved when sensing pixel characteristics over a relatively long time period. Furthermore, according to this embodiment, the impact of noise and the sensing accuracy can be adjusted based on the length of the sensing segment. Attached Figure Description

[0017] Figure 1 This is a configuration diagram of a display device according to an embodiment;

[0018] Figure 2 It is shown Figure 1 The diagram shows the structure of each pixel and the signals of the data driving circuit and pixel sensing circuit relative to the pixel input / output.

[0019] Figure 3 This is a diagram illustrating the sensing segment of a pixel sensing circuit according to an embodiment;

[0020] Figure 4 This is a graph showing the magnitude of the noise generated in the first and second modes;

[0021] Figure 5 This is a configuration diagram of the pixel sensing circuit according to an embodiment;

[0022] Figure 6 This is a configuration diagram of the control circuit in the pixel sensing circuit according to an embodiment; and

[0023] Figure 7 This is a flowchart of an FSR control method for various modes of a pixel sensing circuit according to an embodiment. Detailed Implementation

[0024] Figure 1 This is a configuration diagram of a display device according to an embodiment.

[0025] refer to Figure 1 The display device 100 may include a panel 110 and panel driving devices 120, 130, 140 and 150 for driving the panel 110.

[0026] Multiple data lines DL, multiple gate lines GL, and multiple sensing lines SL can be set on panel 110, and multiple pixels P can be set on panel 110.

[0027] The means 120, 130, 140 and 150 for driving at least one component included in the panel 110 can be referred to as panel driving means. For example, the data driving circuit 120, the pixel sensing circuit 130, the gate driving circuit 140 and the data processing circuit 150 can be referred to as panel driving means.

[0028] Each of the circuits 120, 130, 140 and 150 described above can be referred to as a panel driving device, and all or more of the circuits can be referred to as a panel driving device.

[0029] In the panel driving device, the gate driving circuit 140 can supply a scan signal of turn-on voltage or turn-off voltage to the gate line GL. When the scan signal of turn-on voltage is supplied to pixel P, pixel P is connected to data line DL, and when the scan signal of turn-off voltage is supplied to pixel P, the connection between pixel P and data line DL is released.

[0030] In the panel driving device, the data driving circuit 120 supplies data voltage to the data line DL. Based on the scan signal, the data voltage supplied to the data line DL is transmitted to the pixel P connected to the data line DL.

[0031] In the panel driving device, the pixel sensing circuit 130 receives analog signals, such as voltage or current, generated in each pixel P. The pixel sensing circuit 130 can be connected to each pixel P according to a scan signal, or according to a separate sensing signal. In this case, a separate sensing signal can be generated by the gate driving circuit 140.

[0032] In the panel driving device, the data processing circuit 150 can supply various control signals to the gate driving circuit 140 and the data driving circuit 120. The data processing circuit 150 can generate a gate control signal GCS for starting scanning according to the timing implemented in each frame, and transmit the generated gate control signal GCS to the gate driving circuit 140. The data processing circuit 150 can output image data RGB, obtained by converting externally input image data according to the data signal format used by the data driving circuit 120, to the data driving circuit 120. The data processing circuit 150 can transmit a data control signal DCS for controlling the data driving circuit 120 to supply data voltage to each pixel P according to the timing.

[0033] The data processing circuit 150 can compensate for and transmit image data RGB based on the characteristics of pixel P. In this case, the data processing circuit 150 can receive pixel sensing data S_DATA from the pixel sensing circuit 130. The pixel sensing data S_DATA may include measured values ​​of the characteristics of pixel P.

[0034] Data driving circuit 120 may be referred to as a source driver. Gate driving circuit 140 may be referred to as a gate driver. Data processing circuit 150 may be referred to as a timing controller. Data driving circuit 120 and pixel sensing circuit 130 may be included in a single integrated circuit 125 and may be referred to as a source driver integrated circuit (IC). Data driving circuit 120, pixel sensing circuit 130 and data processing circuit 150 may be included in a single integrated circuit and may be referred to as a unified IC. While embodiments are not limited to these names, descriptions of some components commonly known in the source driver, gate driver, and timing controller will be omitted in the following description of embodiments. Therefore, it should be understood that some configurations of these configurations are omitted when understanding the embodiments.

[0035] Panel 110 may be an organic light-emitting display panel. In this case, the pixels P arranged on panel 110 may include organic light-emitting diodes (OLEDs) and one or more transistors. The characteristics of the organic light-emitting diodes (OLEDs) and transistors included in each pixel P may change over time or due to the surrounding environment. The pixel sensing circuit 130 according to an embodiment can sense the characteristics of these components included in each pixel P and transmit the sensed characteristics to the data processing circuit 150.

[0036] Figure 2 It is shown Figure 1 The diagram shows the structure of each pixel and the signals of the data driving circuit and pixel sensing circuit relative to the pixel input / output.

[0037] refer to Figure 2 Pixel P may include organic light-emitting diodes (OLEDs), driving transistors (DRTs), switching transistors (SWTs), sensing transistors (SENTs), or storage capacitors (Cstgs), etc.

[0038] An organic light-emitting diode (OLED) may include an anode electrode, an organic layer, and a cathode electrode. Under the control of a driving transistor DRT, the anode electrode is connected to a driving voltage EVDD, and the cathode electrode is connected to a base voltage EVSS to emit light.

[0039] The driving transistor DRT can control the brightness of the organic light-emitting diode (OLED) by controlling the driving current supplied to the OLED.

[0040] The first node N1 of the driving transistor DRT can be electrically connected to the anode of the organic light-emitting diode (OLED) and can be either the source or drain node. The second node N2 of the driving transistor DRT can be electrically connected to the source or drain node of the switching transistor SWT and can be either the gate node. The third node N3 of the driving transistor DRT can be electrically connected to the driving voltage line DVL that supplies the driving voltage EVDD and can be either the drain or source node.

[0041] The switching transistor SWT can be electrically connected between the data line DL and the second node N2 of the driving transistor DRT, and can be turned on by receiving a scan signal via gate lines GL1 and GL2.

[0042] When the switching transistor SWT is turned on, the data voltage Vdata supplied from the data drive circuit 120 via the data line DL is transmitted to the second node N2 of the drive transistor DRT.

[0043] The storage capacitor Cstg can be electrically connected between the first node N1 and the second node N2 of the driving transistor DRT.

[0044] The storage capacitor Cstg can be a parasitic capacitor existing between the first node N1 and the second node N2 of the driving transistor DRT, or it can be an external capacitor intentionally designed to be outside the driving transistor DRT.

[0045] The sensing transistor SENT can connect the sensing line SL and the first node N1 of the driving transistor DRT, and the sensing line SL can transmit the reference voltage Vref to the first node N1, and can transmit analog signals such as voltage or current to the pixel sensing circuit 130.

[0046] The pixel sensing circuit 130 measures the characteristics of pixel P by using an analog signal (Vsense or Isense) transmitted via the sensing line SL.

[0047] When the voltage at the first node N1 is measured, the threshold voltage, current mobility, and current characteristics of the driving transistor DRT can be determined. Furthermore, when the voltage at the first node N1 is measured, the degree of degradation of the organic light-emitting diode (OLED), such as its parasitic capacitance and current characteristics, can be determined.

[0048] The pixel sensing circuit 130 can measure the voltage of the first node N1 and transmit the measured value to the data processing circuit (referring to...). Figure 1 (150 in the middle). Additionally, the data processing circuit (referring to...) Figure 1 (150) can determine the characteristics of each pixel P by analyzing the voltage of the first node N1.

[0049] On the other hand, the pixel sensing circuit 130 can sense the characteristics of a pixel during periods when the panel is not driven. For example, the pixel sensing circuit 130 can sense the characteristics of a pixel during the V-Blank segment of a frame when the panel is not driven. The pixel sensing circuit 130 can also sense the characteristics of a pixel during the period after the panel is stopped being driven according to a shutdown signal from the system (i.e., the system including the display device).

[0050] Figure 3 This is a diagram illustrating the sensing segment of a pixel sensing circuit according to an embodiment.

[0051] refer to Figure 3 The sensing segments T310 and T320 of the pixel sensing circuit can be formed in the segment after the V-Blank segment and the off signal.

[0052] A frame can be divided into a display segment DIS for updating the image and a V-Blank segment V. Image updating is not required in the V-Blank segment V. A first sensing segment T310 for pixel sensing circuitry to sense pixels can be formed within the V-Blank segment. The V-Blank segment can have a relatively short length. In the case of forming multiple first sensing segments for multiple pixels within the V-Blank segment, each first sensing segment can have a length of tens of microseconds.

[0053] Because this segment is relatively short, the pixel sensing circuit can sense the current mobility of the driving transistor in the pixel within the first sensing segment T310. The pixel sensing circuit can sense the characteristic voltage related to the pixel's current mobility during a short period of supplying a relatively high current to the pixel.

[0054] After the turn-off signal, the image may not be displayed on the panel. A second sensing segment T320 for the pixel sensing circuit to sense pixels can be formed in the segment after the turn-off signal. The segment after the turn-off signal can have a relatively long length. In the case of forming multiple second sensing periods for multiple pixels within the time period after the turn-off signal, each second sensing period can have a length of tens of milliseconds.

[0055] Because this segment is relatively long, the pixel sensing circuit can sense the threshold voltage of the driving transistor in the pixel within the second sensing segment T320. The pixel sensing circuit can sense the characteristic voltage related to the pixel's threshold voltage during a relatively low current supply to the pixel over a long period. Alternatively, the pixel sensing circuit can sense the characteristic voltage related to the pixel's threshold voltage after waiting until or near a time point when the driving transistor in the pixel is turned off. During sampling, the current flowing to the driving transistor can be close to zero.

[0056] The pixel sensing mode performed during the first sensing period can be referred to as the first mode, and the pixel sensing mode performed during the second sensing period can be referred to as the second mode. The length of the sensing segment in the first mode may be shorter than the length of the sensing segment in the second mode.

[0057] The pixel sensing circuit can sense a characteristic voltage related to the current mobility of the driving transistor disposed in the pixel in a first mode, and can sense a characteristic voltage related to the threshold voltage of the driving transistor disposed in the pixel in a second mode. When comparing based on sampling points, the amount of current supplied to the pixel in the first mode can be greater than the amount of current supplied to the pixel in the second mode.

[0058] The data processing device can compensate for the current mobility of the driving transistor disposed in the pixel based on the pixel sensing data generated in the first mode, and can compensate for the threshold voltage of the driving transistor disposed in the pixel based on the pixel sensing data generated in the second mode.

[0059] In the first mode, relatively large noise may occur because a relatively large current is used to sense the pixel during a relatively short sensing period. Since the second mode has a relatively long sensing period and senses the pixel during a period when the characteristic voltage is approximately saturated (i.e., a period with very little current flow), relatively small noise may occur.

[0060] Figure 4 This is a graph showing the magnitude of the noise generated in the first and second modes.

[0061] refer to Figure 4 When the sensing signal SENSE is converted to a high voltage level in the first mode, current for sensing is supplied to the pixel, and the pixel's sensing voltage Vsense increases. Furthermore, the pixel sensing circuit can obtain a sampling voltage Vsmp by sampling the sensing voltage Vsense near the end of the first sensing segment where the sensing signal SENSE has a high voltage level. Here, the sampling voltage Vsmp can correspond to the pixel's characteristic voltage. The display device can use this characteristic voltage to compensate for the current mobility of the driving transistors provided in the pixel.

[0062] When the sensing signal SENSE is converted to a high voltage level in the second mode, current for sensing is supplied to the pixel, and the pixel's sensing voltage Vsense increases. Furthermore, the pixel sensing circuit can obtain a sampling voltage Vsmp by sampling the sensing voltage Vsense near the end of the second sensing segment where the sensing signal SENSE has a high voltage level. Here, the sampling voltage Vsmp can correspond to the pixel's characteristic voltage. The display device can use this characteristic voltage to compensate for the threshold voltage of the driving transistors provided in the pixel.

[0063] In the first mode, the first sensing segment can have a length of approximately tens of microseconds, and in the second mode, the second sensing segment can have a length of approximately tens of milliseconds. In both modes, sampling is performed in the latter half of the sensing segment. In the first mode, the length from the start of the first sensing segment to the sampling segment can be approximately tens of microseconds, and in the second mode, the length from the start of the second sensing segment to the sampling segment can be approximately tens of milliseconds.

[0064] Compared to the second mode, the first mode may have a greater impact from noise due to its relatively short sensing period and relatively large current. Therefore, the sensing error Δ1 caused by noise in the first mode may appear larger than the sensing error Δ2 in the second mode. This sensing error can lead to image quality degradation. For example, horizontal or vertical stripes may be observed in the image due to such a sensing error.

[0065] To improve this problem, the pixel sensing circuit can increase the FSR of the analog-to-digital converter in modes with a lot of noise, and change the FSR to decrease the FSR of the analog-to-digital converter in modes with less noise.

[0066] Figure 5 This is a configuration diagram of the pixel sensing circuit according to an embodiment.

[0067] refer to Figure 5 The pixel sensing circuit 130 may include a preprocessing circuit 510, a sample and hold circuit 520, a scaling circuit 530, an analog-to-digital converter 540, a control circuit 550, and a digital processing circuit 560, etc.

[0068] When the preprocessing circuit 510 is connected to pixel P, the preprocessing circuit 510 can receive a sensing voltage Vsense formed at a node of pixel P. Alternatively, when the preprocessing circuit 510 is connected to pixel P, the preprocessing circuit 510 can receive a sensing current flowing to a node of pixel P.

[0069] The preprocessing circuit 510 can preprocess the sensed voltage Vsense. According to an exemplary embodiment, the preprocessing circuit 510 may only require wiring, without any other circuit elements.

[0070] The sample-and-hold circuit 520 samples and holds the sensed voltage Vsense. The sample-and-hold circuit 520 may include a sampling switch and a holding capacitor. When the sampling switch is closed, the sensed voltage Vsense is transferred to the holding capacitor, allowing the sensed voltage Vsense to be sampled and held. The sampling switch can be closed by a sampling signal SMP, and the sampling signal SMP may appear in the latter half of the sensing segment.

[0071] The scaling circuit 530 can adjust the range of the sampling voltage Vsmp. The scaling circuit 530 may include a scaling capacitor, and the range of the sampling voltage can be adjusted by using the charge shared between the holding capacitor and the scaling capacitor. The scaling voltage Vscl output from the scaling circuit 530 can correspond to the characteristic voltage of the pixel. Furthermore, such the characteristic voltage of the pixel can be converted into digital data PDATA by the analog-to-digital converter 540.

[0072] The circuitry preceding the analog-to-digital converter 540 can be classified as analog circuitry. In the pixel sensing circuit 130, the analog circuitry may include a preprocessing circuit 510, a sample-and-hold circuit 520, and a scaling circuit 530, and is primarily responsible for processing analog signals. The analog circuitry can sense pixel P during the sensing period when pixel P and the preprocessing circuit 510 are connected to obtain a sensing voltage Vsense, and can sample the sensing voltage Vsense during some sampling periods to obtain characteristic voltages such as a scaling voltage Vscl.

[0073] The digital data PDATA generated by the analog-to-digital converter 540 can be transmitted to the digital processing circuit 560, and the digital processing circuit 560 can generate pixel sensing data S_DATA based on the digital data PDATA, and transmit the generated pixel sensing data S_DATA to an externally configured data processing circuit.

[0074] The control circuit 550 can supply the FSR voltage Vfsr to the analog-to-digital converter 540 according to the control signal CTR, so as to change the full range (FSR) of the analog-to-digital converter 540.

[0075] The control circuit 550 can change the FSR of the analog-to-digital converter 540 according to the mode. For example, when the length of the sensing segment in the first mode and the length of the sensing segment in the second mode are different from each other, the control circuit 550 can set the FSR of the analog-to-digital converter 540 in different ways in the first mode and the second mode.

[0076] As an example, control circuit 550 can set the FSR of a mode with a shorter sensing segment length to be greater than the FSR of a mode with a longer sensing segment length. As another example, control circuit 550 can set the FSR to be larger as the length from the start of the sensing segment to the sampling segment becomes shorter.

[0077] As the FSR increases, the analog-to-digital converter 540 can be relatively less affected by noise. However, according to the embodiment, if the FSR increases, the linearity of the analog-to-digital conversion may decrease, resulting in a loss of accuracy. Therefore, the analog-to-digital converter 540 can increase the FSR in noisy environments and decrease the FSR in low-noise environments.

[0078] The FSR of the analog-to-digital converter 540 can be determined based on the supplied FSR voltage, and the control circuit 550 can change the FSR of the analog-to-digital converter 540 by changing the FSR voltage.

[0079] The FSR voltage can include a negative FSR voltage corresponding to the lower voltage of the FSR and a positive FSR voltage corresponding to the upper voltage. The control circuit 550 can change the FSR of the analog-to-digital converter 540 by changing the negative FSR voltage and the positive FSR voltage.

[0080] Figure 6 This is a configuration diagram of the control circuit in the pixel sensing circuit according to an embodiment; and

[0081] refer to Figure 6 The control circuit 550 may include a voltage generator 610 and multiple selectors 621 and 622.

[0082] Voltage generator 610 can generate multiple positive FSR voltages Vfsr1+ and Vfsr2+, and multiple negative FSR voltages Vfsr1- and Vfsr2-. Voltage generator 610 can output the multiple negative FSR voltages Vfsr1- and Vfsr2- to the first selector 621, and can transmit the multiple positive FSR voltages Vfsr1+ and Vfsr2+ to the second selector 622.

[0083] The first selector 621 can output one of multiple negative FSR voltages Vfsr1- and Vfsr2- as the negative FSR voltage Vfsr- based on the control signal CTR.

[0084] In addition, the second selector 622 can output one of multiple positive FSR voltages Vfsr1+ and Vfsr2+ as positive FSR voltage Vfsr+ according to the control signal CTR.

[0085] The first cathode FSR voltage Vfsr1- can be lower than the second cathode FSR voltage Vfsr2-, and the first anode FSR voltage Vfsr1+ can be higher than the second anode FSR voltage Vfsr2+. The control circuit 550 can select and output the first negative FSR voltage Vfsr1- and the first positive FSR voltage Vfsr1+ according to a first-mode control signal (CTR with a value of 0), and can select and output the second negative FSR voltage Vfsr2- and the second positive FSR voltage Vfsr2+ according to a second-mode control signal (CTR with a value of 1).

[0086] Figure 7 This is a flowchart of an FSR control method for various modes of a pixel sensing circuit according to an embodiment.

[0087] refer to Figure 7 The pixel sensing circuit can receive a control signal for pattern determination (S710). The pixel sensing circuit can receive a control signal from the data processing circuit or a control signal from the data driving circuit. The data processing circuit or the data driving circuit can identify the V-Blank segment according to the display timing in the panel driving device and generate a control signal for pattern determination. The data processing circuit can receive a shutdown signal from an external device, such as a main device, and generate a control signal for pattern determination based on the shutdown signal.

[0088] The pixel sensing circuit can determine whether the mode is the first mode or the second mode based on the control signal (S720).

[0089] When the mode is the first mode, the pixel sensing circuit can increase the FSR of the analog-to-digital converter (S732), and when the mode is the second mode, the pixel sensing circuit can decrease the FSR of the analog-to-digital converter (S734).

[0090] The pixel sensing circuit can use an analog-to-digital converter to convert the characteristic voltage of the pixel into digital data based on the modified FSR.

[0091] As described above, according to this embodiment, pixel characteristics can be sensed while minimizing the impact of noise. Furthermore, according to this embodiment, the impact of noise can be reduced when sensing pixel characteristics over a relatively short time period. Additionally, according to this embodiment, the sensing accuracy can be improved when sensing pixel characteristics over a relatively long time period. Furthermore, according to this embodiment, the impact of noise and the sensing accuracy can be adjusted based on the length of the sensing segment.

[0092] Cross-references to related applications

[0093] This application claims priority to Korean Patent Application No. 10-2020-0155074, filed on November 19, 2020, the entire contents of which are incorporated herein by reference.

Claims

1. A pixel sensing device, comprising: Analog circuitry configured to obtain characteristic voltages of pixels disposed in a display panel; An analog-to-digital converter configured to convert the characteristic voltage into digital data; as well as A digital processing circuit configured to generate pixel sensing data based on the digital data. in: The sensing segment in the first mode and the sensing segment in the second mode have different lengths. The analog-to-digital converter is configured to determine the full-range FSR based on the length of the sensing segment, and The FSR in the mode with a shorter sensing segment is set to be greater than that in the mode with a longer sensing segment in order to reduce the impact of noise and maintain sensing accuracy during the shortened sensing period.

2. The pixel sensing device according to claim 1, wherein, The analog circuit senses the pixel in the sensing segment to obtain a sensing voltage, and samples the sensing voltage in a partial sampling segment of the sensing segment to obtain the characteristic voltage.

3. The pixel sensing device according to claim 2, wherein, The shorter the length from the start of the sensing segment to the sampling segment, the larger the FSR is set.

4. The pixel sensing device according to claim 1, wherein, The analog circuit includes a sample-and-hold circuit and a scaling circuit. The sample-and-hold circuit is configured to obtain the characteristic voltage of the pixel, and the scaling circuit is configured to adjust the range of the characteristic voltage. The analog-to-digital converter converts the range-adjusted characteristic voltage into digital data.

5. The pixel sensing device according to claim 1, wherein, The FSR of the analog-to-digital converter is determined based on the supplied FSR voltage, and The pixel sensing device also includes a control circuit configured to change the FSR voltage according to a mode.

6. The pixel sensing device according to claim 5, wherein, The FSR voltage includes a positive FSR voltage and a negative FSR voltage, and The control circuit selects and outputs a positive FSR voltage from among a plurality of positive FSR voltages based on a control signal for the mode, and selects and outputs a negative FSR voltage from among a plurality of negative FSR voltages.

7. The pixel sensing device according to claim 2, wherein, In the first mode, the sensing segment is formed within a vertical blanking segment of a frame, and in the second mode, the sensing segment is formed after the system's shutdown signal.

8. A panel driving device, comprising: A data driving circuit is configured to convert image data into a data voltage and supply the data voltage to a data line connected to a pixel; A data processing circuit is configured to compensate the image data using pixel sensing data corresponding to the characteristics of the pixel; as well as A pixel sensing circuit includes an analog circuit and an analog-to-digital converter. The analog circuit is configured to obtain a characteristic voltage of the pixel, the analog-to-digital converter is configured to convert the characteristic voltage into digital data, and the pixel sensing circuit is configured to generate pixel sensing data based on the digital data. in: The sensing segment in the first mode and the sensing segment in the second mode have different lengths, and The analog-to-digital converter is configured to determine the full-range FSR based on the length of the sensing segment, and the FSR in the mode with a shorter sensing segment is set to be greater than the FSR in the mode with a longer sensing segment, so as to reduce the impact of noise and maintain sensing accuracy under shortened sensing periods.

9. The panel driving device according to claim 8, wherein, The pixel sensing circuit receives a control signal for the mode from the data processing circuit or the data driving circuit.

10. The panel driving device according to claim 8, wherein, The pixel sensing circuit senses the pixel in a first mode within a vertical blanking segment of a frame, and in a second mode after the system's shutdown signal.

11. The panel driving device according to claim 10, wherein, The data processing circuit compensates for the current mobility of the driving transistor disposed in the pixel based on the pixel sensing data generated in the first mode, and compensates for the threshold voltage of the driving transistor based on the pixel sensing data generated in the second mode.

12. The panel driving device according to claim 10, wherein, During the sampling time, a higher current is supplied to the pixel in the first mode compared to the second mode.

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