TWI754513B - Pixel circuit of display device - Google Patents

Abstract

A pixel circuit of a display device includes a light emitting diode (LED) and a pulse width modulation (PWM) driving circuit electrically connected to the LED. The PWM driving circuit receives a data signal and controls the pulse width of a driving current that the PWM driving circuit provides to the LED based on the data signal. The PWM driving circuit receives a sweep signal and controls whether the LED emits light or not based on the sweep signal. A duration which the LED emits light corresponds to a curve segment of a waveform of the sweep signal. The curve segment is symmetric with respect to a normal line that passes a midpoint of the curve segment.

Description

Pixel circuit of display device

The present invention relates to a circuit, and in particular to a pixel circuit of a display device.

The pulse width modulation (PWM) driving method is widely used in active light emitting diode (LED) display devices. The PWM driving method adjusts the pulse of the driving current provided to the LED of the display device. width, so that various grayscales can be presented.

Usually, the PWM driving method is also matched with a sweep signal to control whether the LED emits light or not. However, in the conventional practice, the waveform of the sweep signal is an asymmetric and discontinuous triangle wave, which causes the display device to display Low grayscale images have the defect of insufficient brightness uniformity. In addition, the display image of the display device has the defect of brightness unevenness (mura) due to the difference between the resistive and capacitive loads corresponding to the pixels located in different columns.

The purpose of the present invention is to provide a pixel circuit of a display device, comprising: a light emitting diode and a pulse width modulation driving circuit, and the pulse width modulation driving circuit is electrically connected to the light emitting diode. The pulse width modulation driving circuit receives the data signal and controls the pulse width of the driving current provided to the light emitting diode based on the data signal. The pulse width modulation driving circuit receives the frequency sweep signal and controls the light emitting diode to emit light or not to emit light based on the frequency sweep signal. The first time period during which the light-emitting diode emits light corresponds to the first curve segment in the waveform of the frequency sweep signal, and the first curve segment is symmetrical to the normal passing through the midpoint of the first curve segment.

In some embodiments, the slope of the tangent line at the midpoint of the first curve segment is zero.

In some embodiments, the slope of the tangent line of the first curve segment is continuously increasing from a negative value to a positive value or continuously decreasing from a positive value to a negative value.

In some embodiments, the function corresponding to the first curve segment is a continuous function.

In some embodiments, the above-mentioned display device is a normally black type display device.

In some embodiments, the pixel circuit of the above-mentioned display device further includes a light-emitting transistor electrically connected between the light-emitting diode and the pulse width modulation driving circuit, and the gate terminal of the light-emitting transistor receives the control signal. The second time period when the control signal is at a low voltage level corresponds to a second curve segment in the waveform of the frequency sweep signal, and the second curve segment includes the first curve segment.

In some embodiments, the function corresponding to the second curve segment is a continuous function.

In some embodiments, the second curve segment includes a positive half cycle and a negative half cycle, and the first curve segment is located in one of the positive half cycle and the negative half cycle.

In some embodiments, the above-mentioned second curve segment is a symmetrical and continuous sine wave.

In some embodiments, the pixel circuit of the above-mentioned display device further includes a pulse amplitude modulation driving circuit, and the pulse amplitude modulation driving circuit receives the data signal and controls the amplitude of the driving current based on the data signal.

In some embodiments, the above-mentioned light emitting diodes are micro light emitting diodes (micro-LEDs).

In some embodiments, the above-mentioned display device is an Active Display.

In some embodiments, the above-mentioned pixel circuit drives the display device by a progressive emission method.

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, the following embodiments are given and described in detail with the accompanying drawings as follows.

Embodiments of the present invention are discussed in detail below. It should be appreciated, however, that the embodiments provide many applicable concepts that can be embodied in a wide variety of specific contexts. The discussed and disclosed embodiments are for illustration only, and are not intended to limit the scope of the present invention.

It will be understood that, although the terms "first," "second," "third," etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, and/or or parts shall not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, "a first element," "component," "region," "layer" or "section" discussed below could be termed a second element, component, region, layer or section without departing from the teachings herein.

The terminology used herein is for the purpose of describing particular embodiments only and is not limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms including "at least one" unless the content clearly dictates otherwise. "Or" means "and/or". As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. It will also be understood that, when used in this specification, the terms "comprising" and/or "comprising" designate the stated feature, region, integer, step, operation, presence of an element and/or part, but do not exclude one or more The presence or addition of other features, entireties of regions, steps, operations, elements, components, and/or combinations thereof.

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 this invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be construed as having meanings consistent with their meanings in the context of the related art and the present invention, and are not to be construed as idealized or excessive Formal meaning, unless expressly defined as such herein.

FIG. 1 is a schematic diagram of a pixel circuit 100 of a display device according to an embodiment of the present invention. The pixel circuit 100 includes a light emitting diode (LED) 110 , a light emitting transistor 120 and a pulse width modulation (PWM) driving circuit 130 . The anode terminal of the LED 110 is electrically connected to the drain terminal of the light-emitting transistor 120 , the cathode terminal of the LED 110 is electrically connected to the ground voltage VSS, and the source terminal of the light-emitting transistor 120 is electrically connected to the PWM driving circuit 130 . In an embodiment of the present invention, the LED 110 is a micro light emitting diode (micro-LED). In an embodiment of the present invention, the display device is an Active Display. Specifically, in the embodiment of the present invention, the pixel circuit 100 is a pixel circuit of an active micro-LED display.

As shown in FIG. 1 , the PWM driving circuit 130 includes a data writing transistor M1 , and the data writing transistor M1 is connected to the data line of the display device to receive the data signal data. The PWM driving circuit 130 can perform PWM control on the LED 110 based on the data signal data input through the data writing transistor M1. In other words, the PWM driving circuit 130 controls the pulse width of the driving current it provides to the LED 110 based on the data signal data, so that the LED 110 can present various gray scales.

The data writing transistor M1 can be turned on or off according to the control signal sPWM. When the data writing transistor M1 is turned on according to the control signal sPWM, the voltage of the gate terminals of the transistor M2 and the transistor M3 is the voltage of the data signal data.

The PWM driving circuit 130 further includes a capacitor C1, a capacitor C2, a capacitor C3, a transistor M2, and a transistor M3. The capacitor C1 receives the sweep signal sweep, so that the voltages of the gate terminals of the transistor M2 and the transistor M3 can vary with the sweep signal sweep.

The transistor M2 receives the reference voltage ref_on, and the capacitor C2 is electrically connected between the transistors M2 to maintain the voltage level. The transistor M3 receives the reference voltage ref_off, and the capacitor C3 is electrically connected between the transistors M3 to maintain the voltage level. In other embodiments of the present disclosure, the PWM driving circuit 130 may selectively include only the capacitor C2, or the PWM driving circuit 130 may selectively only include The capacitor C3 is included, or the PWM driving circuit 130 may selectively include neither the capacitor C2 nor the capacitor C3.

The transistor M2 and the transistor M3 can be turned on or off according to the sweep signal sweep. In the embodiment of the present invention, the reference voltage ref_on is at a low voltage level, and the reference voltage ref_off is at a high voltage level. Accordingly, when the voltage level of the sweep signal sweep decreases to the voltage of the reference voltage ref_on minus the transistor M2 When the threshold voltage of , the transistor M2 is turned on; relatively speaking, when the voltage level of the sweep signal sweep decreases to the value of the reference voltage ref_off minus the threshold voltage of the transistor M3, the transistor M3 is turned on .

The PWM driving circuit 130 further includes a driving transistor M4. When the transistor M2 is turned on, the gate terminal of the driving transistor M4 receives the low voltage level of the reference voltage ref_on and is turned on, so that the light-emitting transistor 120 receives the system high voltage VDD.

The light emitting transistor 120 can be turned on or off according to the control signal emi. Specifically, when the driving transistor M4 is turned on, the light emitting transistor 120 receives the system high voltage VDD, and when the system high voltage VDD is higher than the voltage value of the control signal emi, the light emitting transistor 120 is turned on, and the light emitting transistor 120 turns to The LED 110 provides a driving current, and accordingly, the LED 110 emits light.

2 is a timing diagram of various signal changes during operation of the pixel circuit 100 according to an embodiment of the present invention. As shown in FIG. 2, the operation time of the pixel circuit 100 is divided into a scanning period T1 and a light emitting period T2. The scan period T1 is a period for applying the data signal data to the PWM driving circuit 130 . For example, in the scanning period T1, when the data writing transistor M1 is turned on according to the control signal sPWM, the data writing transistor M1 applies the data signal data to the gate terminals of the transistor M2 and the transistor M3.

The light-emitting period T2 refers to the period during which the LED 110 emits light according to the sweep signal sweep and the control signal emi. As shown in FIG. 2 , when the light-emitting period T2 starts, the sweep signal sweep is applied to the gate terminals of the transistor M2 and the transistor M3 through the capacitor C1, so the voltage of the gate terminal of the transistor M2 starts according to the sweep signal sweep Variety. When the voltage of the gate terminal of the transistor M2 decreases to the value of the reference voltage ref_on minus the threshold voltage of the transistor M2 with the sweep signal sweep (ie the time point t3 in FIG. 2 ), the transistor M2 is turned on and The driving transistor M4 is turned on by applying the low voltage level of the reference voltage ref_on to the gate terminal of the driving transistor M4 by the transistor M2, and the light-emitting transistor 120 receives the system high voltage VDD through the driving transistor M4, and because at this time The control signal emi is at a low voltage level, the light-emitting transistor 120 is turned on, and the light-emitting transistor 120 provides a driving current to the LED 110 so that the LED 110 emits light.

Then, after the time point t3, when the voltage of the gate terminal of the transistor M2 rises to the value of the reference voltage ref_on minus the threshold voltage of the transistor M2 along with the sweep signal sweep (that is, the time point in FIG. 2 ) t4), the transistor M2 is turned off. At the same time, the transistor M3 is turned on and the driving transistor M4 is turned off by applying the high voltage level of the reference voltage ref_off to the gate terminal of the driving transistor M4, and the light-emitting transistor 120 cannot receive the system through the driving transistor M4 When the voltage of VDD is high, the light emitting transistor 120 cannot provide the driving current to the LED 110 so that the LED 110 stops emitting light.

Specifically, the PWM driving circuit 130 controls the LED 110 to emit light or not to emit light based on the sweep signal sweep. According to the above, the LED 110 emits light from the time point t3 in the light emission period T2 until the time point t4 in the light emission period T2. Therefore, it can be understood that the LED 110 does not emit light when the light-emitting period T2 starts (the control signal emi/sweep starts), so the display device of the present invention is a normally black display device.

FIG. 3 is a schematic diagram of a pixel circuit 200 of a display device according to an embodiment of the present invention. The pixel circuit 200 is similar to the pixel circuit 100 , except that the pixel circuit 200 further includes a pulse amplitude modulation (PAM) driving circuit 140 that is electrically connected to the PWM driving circuit 130 .

The PAM driving circuit 140 includes a data writing transistor M5 and a driving transistor M6. The data writing transistor M5 is connected to the data line of the display device to receive the data signal data. The PAM driving circuit 140 can perform PAM control on the LED 110 based on the data signal data input through the data writing transistor M5. In other words, the PAM driving circuit 140 controls the amplitude of the driving current it provides to the LED 110 based on the data signal data, so that the LED 110 can present various gray scales.

The data writing transistor M5 can be turned on or off according to the control signal sPAM. When the data writing transistor M5 is turned on according to the control signal sPAM, the voltage of the gate terminal of the driving transistor M6 is the voltage of the data signal data, so that the driving transistor M6 provides a driving current with a corresponding amplitude to the LED 110 according to the data signal data .

It should be noted that the circuit structures of the pixel circuits shown in FIG. 1 and FIG. 3 are only examples, and are not intended to limit the present invention. For example, the source terminal of the light emitting transistor 120 can also be directly electrically connected to the system high voltage VDD. For example, the sweep signal sweep can also be received by another transistor instead of the capacitor C1. For example, the pixel circuit of the present invention may further include additional transistors and/or capacitors to implement voltage reset and/or offset compensation.

4 is a timing diagram of various signal changes during operation of the pixel circuit 200 according to an embodiment of the present invention. As shown in FIG. 4, the operation time of the pixel circuit 200 is divided into a scanning period T1 and a light emission period T2. The scanning period T1 is a period for applying the data signal data to the PWM driving circuit 130 and the PAM driving circuit 140 respectively. For example, in the scanning period T1, when the data writing transistor M1 is turned on according to the control signal sPWM, the data writing transistor M1 applies the data signal data to the gate terminals of the transistor M2 and the transistor M3. For example, in the scanning period T1, when the data writing transistor M5 is turned on according to the control signal sPAM, the data writing transistor M5 applies the data signal data to the gate terminal of the driving transistor M6.

As shown in FIG. 4 , in the scanning period T1 , the data writing transistor M1 is first turned on according to the control signal sPWM, and then the data writing transistor M5 is turned on according to the control signal sPAM. However, the present invention is not limited thereto. In other embodiments of the present invention, the data writing transistor M5 may be turned on first according to the control signal sPAM, and then the data writing transistor M1 may be turned on according to the control signal sPWM.

The operation of the pixel circuit 200 in the light-emitting period T2 of FIG. 4 is substantially similar to the operation of the pixel circuit 100 in the light-emitting period T2 of FIG. 2 , and thus will not be repeated here.

In the embodiment of the present invention, as shown in FIG. 2 and FIG. 4 , the first time period t3-t4 during which the LED 110 emits light corresponds to the first curve segment L1 in the waveform of the sweep signal sweep. In addition, in the embodiment of the present invention, as shown in FIG. 2 and FIG. 4 , the second time period t5-t6 when the control signal emi is at a low voltage level corresponds to the second curve in the waveform of the sweep signal sweep segment L2, and the second curve segment L2 includes the first curve segment L1.

As shown in FIG. 2 and FIG. 4 , the second curve segment L2 is a sine wave, in other words, the second curve segment L2 is a symmetrical and continuous sine wave, the function corresponding to the second curve segment L2 is a continuous function, and the second curve segment L2 is a continuous function. L2 includes a positive half cycle and a negative half cycle, and the first curve segment L1 is located in the negative half cycle of the second curve segment L2.

In the embodiment shown in FIG. 1 and FIG. 3 , the transistor M2 , the transistor M3 and the driving transistor M4 are p-type transistors, but the present invention is not limited thereto. In other embodiments of the present invention, According to practical application requirements, at least one of the transistor M2 , the transistor M3 and the driving transistor M4 can be an n-type transistor. For example, when the transistor M2, the transistor M3 and the driving transistor M4 are all N-type transistors, the first curve segment L1 will be located in the positive half cycle of the second curve segment L2.

FIG. 5 is an enlarged view of the first curve segment L1 according to an embodiment of the present invention. As shown in FIG. 5 , the first curve segment L1 is a symmetrical and continuous waveform. The function corresponding to the first curve segment L1 is a continuous function. The midpoint of the plurality of points constituting the first curve segment L1 is P1, and the first curve segment L1 has a tangent S1 passing through the midpoint P1 and a normal N1 passing through the midpoint P1 and perpendicular to the tangent S1 at the midpoint P1. The tangent slope m1 of the tangent line S1 of the first curve segment L1 at the midpoint P1 is zero. The first curve segment L1 is symmetrical to the normal line N1.

As shown in FIG. 5 , the slope of the tangent line of the first curve segment L1 is continuously increasing from a negative value to a positive value. Specifically, as shown in FIG. 5 , since the first curve segment L1 is a symmetrical and continuous arc wave, the slope m2 of the tangent line S2 of the first curve segment L1 , the slope m3 of the tangent line S3 of the first curve segment L1 , The relationship between the slope m1 of the tangent line S1 of the first curve segment L1, the slope m4 of the tangent line S4 of the first curve segment L1, and the slope m5 of the tangent line S5 of the first curve segment L1 is m2<m3<m1=0<m4<m5. And, the absolute value of slope m2 is equal to the absolute value of slope m5, and the absolute value of slope m3 is equal to the absolute value of slope m4, in other words, |m2|=|m5|>|m3|=|m4|>|m1|= 0.

In other embodiments of the present invention, when the first curved segment L1 is located in the positive half-circle of the second curved segment L2, it is understandable that the first curved segment L1 is a symmetrical and continuous arc with the notch facing downwards Therefore, the slope of the tangent line of the first curve segment L1 decreases continuously from a positive value to a negative value.

It should be noted that the waveforms of the sweep signal sweep shown in FIG. 2 and FIG. 4 are only examples, and are not intended to limit the present invention. 6a to 6d are schematic diagrams of various waveforms of the sweep signal sweep according to an embodiment of the present invention. For example, FIG. 6a shows that the waveform of the sweep signal sweep when the control signal emi is at a low voltage level is a symmetrical and continuous sine wave including two positive half cycles and one negative half cycle. For example, FIG. 6b shows that the waveform of the sweep signal sweep when the control signal emi is at a low voltage level is a symmetrical and continuous sine wave including a negative half cycle. For example, FIG. 6c shows that the waveform of the sweep signal sweep when the control signal emi is at a low voltage level is a symmetrical and continuous sine wave including at least one negative half cycle. For example, FIG. 6d shows that the waveform of the sweep signal sweep when the control signal emi is at a low voltage level is a symmetrical and continuous sine wave including at least one positive half cycle and one negative half cycle.

It should be noted that the waveforms of the sweep signal sweep shown in FIG. 2 , FIG. 4 , and FIGS. 6 a to 6 d are only examples, and are not intended to limit the present invention. For the present invention, a necessary condition is that the waveform of the sweep signal sweep when the LED 110 emits light must be a symmetrical and continuous waveform.

In the conventional display device using the PWM driving method, the waveform of the frequency sweep signal is usually an asymmetric and discontinuous triangular wave, and the display method is normally white type display, which will cause different pixels to be displayed. When the corresponding swept frequency signal is different from the output source, there will be different resistance and capacitance loads, resulting in a significant voltage drop of the swept frequency signal farther away from the output source, resulting in insufficient uniformity of low-gray-scale images. For example, when the swept signal is delayed by about 10 nanoseconds (ns) from the output source, there will be a shift of about 2~3 grayscale values on low grayscale images. In addition, when the waveform of the frequency sweep signal is an asymmetric and discontinuous triangular wave, the display screen of the display device will have uneven brightness (mura) due to the difference between the resistance and capacitance loads corresponding to the pixels located in different columns. defect.

The waveform of the sweep frequency signal sweep of the present invention is a symmetrical and continuous waveform when the LED 110 emits light, so it can more effectively resist the difference between the resistive and capacitive loads. Specifically, the continuous wave characteristic of the sweep signal can resist the voltage drop caused by the difference between the resistive and capacitive loads. In other words, the brightness of the display screen will not be significantly affected by the difference between the resistive and capacitive loads. , the frequency sweep signal far from the output source will not have obvious voltage drop, but only delay the light-emitting time due to the offset of the waveform phase. Specifically, the symmetrical wave characteristic of the sweep signal can resist the waveform change caused by the difference between the resistive and capacitive loads. In other words, the brightness of the display screen will not be significantly affected by the difference between the resistive and capacitive loads. , the sweep frequency signal far from the output source will not have obvious waveform distortion, but only delay the lighting time due to the offset of the waveform phase.

In the embodiment of the present invention, for the pixel circuits corresponding to pixels located in different columns, the waveforms of the sweep signals sweep of the pixel circuits corresponding to the pixels in adjacent columns can be partially overlapped, so as to realize the progressive luminescence. emission) method to drive the display device. In some embodiments of the present invention, the waveforms of the sweep signals sweep of the pixel circuits corresponding to the pixels in the adjacent rows above may be partially overlapped, and a circuit can be used to drive a circuit substrate (gate on array, GOA) by means of a circuit. architecture to implement. In other embodiments of the present invention, the overlapping of waveforms of the sweep signal sweep of the pixel circuits corresponding to the pixels in the adjacent rows can be implemented by means of an integrated circuit board.

In view of the above, the present invention provides a pixel circuit of a display device, wherein the waveform of the sweep signal when the light-emitting diode emits light is a symmetrical and continuous waveform, which can effectively resist the difference between the resistance and capacitance loads. The display device of the present invention can improve the defect of insufficient brightness uniformity when displaying low grayscale images, and the display device of the present invention can also improve the defect of brightness unevenness (mura).

The foregoing has outlined features of several embodiments so that those skilled in the art may better understand aspects of the invention. Those skilled in the art will appreciate that they may readily use the present invention as a basis for designing or modifying other processes and structures, thereby achieving the same objectives and/or achieving the same advantages as the embodiments described herein . Those skilled in the art should also understand that these equivalent constructions do not depart from the spirit and scope of the present invention, and they can make various changes, substitutions and alterations without departing from the spirit and scope of the present invention.

100, 200: pixel circuit 110: Light Emitting Diode 120: light-emitting transistor 130: PWM drive circuit 140: Pulse Amplitude Modulation Drive Circuit C1, C2, C3: Capacitors data: data signal emi,sPAM,sPWM: control signal L1: The first curve segment L2: The second curve segment M1, M5: Data write transistor M2, M3: Transistor M4, M6: drive transistor N1: normal P1: Midpoint ref_on,ref_off: reference voltage S1, S2, S3, S4, S5: Tangent sweep: sweep signal T1: scan period T2: Light-emitting period t3,t4,t5,t6: time points VDD: system high voltage VSS: ground voltage

A better understanding of aspects of the present invention can be obtained from the following detailed description taken in conjunction with the accompanying drawings. It should be noted that, according to standard practice in the industry, various features are not drawn to scale. In fact, the dimensions of the various features may be arbitrarily increased or decreased in order to clarify the discussion. FIG. 1 is a schematic diagram of a pixel circuit of a display device according to an embodiment of the present invention. 2 is a timing diagram of various signal changes during operation of a pixel circuit according to an embodiment of the present invention. 3 is a schematic diagram of a pixel circuit of a display device according to an embodiment of the present invention. 4 is a timing diagram of various signal changes during operation of a pixel circuit according to an embodiment of the present invention. 5 is an enlarged view of a first curve segment according to an embodiment of the present invention. 6a to 6d are schematic diagrams of various waveforms of a frequency sweep signal according to an embodiment of the present invention.

data: data signal

emi,sPWM: control signal

L1: The first curve segment

L2: The second curve segment

ref_on,ref_off: reference voltage

sweep: sweep signal

T1: scan period

T2: Light-emitting period

t3,t4,t5,t6: time points

VDD: system high voltage

VSS: ground voltage

Claims (13)

A pixel circuit of a display device includes: a light emitting diode; and a pulse width modulation driving circuit electrically connected to the light emitting diode; wherein the pulse width modulation driving circuit receives a data signal and is based on the data signal to control the pulse width of a driving current provided to the light emitting diode; wherein the pulse width modulation driving circuit receives a frequency sweep signal and controls the light emitting diode to emit light or not to emit light based on the frequency sweep signal; wherein the light emitting A first time period during which the diode emits light corresponds to a first curve segment in the waveform of the frequency sweep signal, wherein the first curve segment is symmetrical to a normal line passing through a midpoint of the first curve segment ; wherein the waveform of the frequency sweep signal when the light-emitting diode emits light is a continuous waveform. The pixel circuit of a display device as claimed in claim 1, wherein a tangent slope of the first curve segment at the midpoint is 0. The pixel circuit of the display device according to claim 1, wherein the slope of the tangent line of the first curve segment is continuously increasing from a negative value to a positive value or continuously decreasing from a positive value to a negative value. The pixel circuit of a display device according to claim 1, wherein the function corresponding to the first curve segment is a continuous function. The pixel circuit of a display device according to claim 1, wherein the display device is a normally black type display device. The pixel circuit of the display device according to claim 1, further comprising: a light-emitting transistor electrically connected between the light-emitting diode and the pulse width modulation driving circuit, wherein the gate terminal of the light-emitting transistor receives a a control signal; wherein a second time period when the control signal is at a low voltage level corresponds to a second curve segment in the waveform of the frequency sweep signal, wherein the second curve segment includes the first curve segment. The pixel circuit of a display device according to claim 6, wherein the function corresponding to the second curve segment is a continuous function. The pixel circuit of a display device as claimed in claim 6, wherein the second curve segment includes a positive half cycle and a negative half cycle, wherein the first curve segment is located at one of the positive half cycle and the negative half cycle among. The pixel circuit of a display device according to claim 6, wherein the second curve segment is a symmetrical and continuous sine wave. The pixel circuit of the display device as claimed in claim 1, more It includes: a pulse amplitude modulation driving circuit, wherein the pulse amplitude modulation driving circuit receives the data signal and controls the amplitude of the driving current based on the data signal. The pixel circuit of the display device according to claim 1, wherein the light emitting diode is a micro light emitting diode (micro-LED). The pixel circuit of a display device according to claim 1, wherein the display device is an Active Display. The pixel circuit of a display device according to claim 1, wherein the pixel circuit drives the display device by a progressive emission method.

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