CN113674684B - Light emitting diode display panel and driving method thereof - Google Patents

Abstract

A light emitting diode display panel and a driving method thereof, the driving method of the light emitting diode display panel includes: equally dividing the LED display panel along the scanning direction of the LED display panel to form a plurality of driving units, wherein each driving unit comprises a plurality of rows of pulse width modulation pixel circuits; and sequentially enabling each driving unit to form a scanning light-emitting interval of each driving unit; in the scanning light-emitting interval of each driving unit, the multiple rows of pulse width modulation pixel circuits in the driving unit are firstly selected in sequence to write in a piece of coherence data, and then pulse width modulation light-emitting is carried out simultaneously. Therefore, the risk of large driving current can be reduced when the display panel is driven in a pulse width modulation mode, and the design complexity of the driving circuit can be simplified.

Description

Light-emitting diode display panel and driving method thereof

technical field

The present invention relates to a display panel and its driving method, in particular to a light-emitting diode display panel driven by pulse width modulation and its driving method.

Background technique

With the maturity of the manufacturing technology of light-emitting diode (LED) display panels, the technologies for driving display panels are also diverse. Among them, driving the display panel by pulse width modulation can include the following advantages: high gray-scale efficiency of the panel, gray-scale color shift of the panel Excellent control, excellent color control, wide adjustable range of panel brightness, etc. However, there are still risk problems such as driving current accumulation and design complexity of the driving circuit.

Contents of the invention

The light-emitting diode display panel and its driving method provided by the present invention can reduce the risk of large driving current and simplify the design complexity of the driving circuit when driving the light-emitting diode display panel in a pulse width modulation manner.

The light-emitting diode display panel provided by the present invention includes a plurality of drive units, which are equally divided along the scanning direction of the above-mentioned light-emitting diode display panel, wherein each drive unit includes multiple columns of pulse width modulation pixel circuits; and, each drive The units are sequentially enabled to form a scanning light-emitting interval of each driving unit; wherein, in the scanning light-emitting interval of each driving unit, the multi-column pulse width modulation pixel circuits of the driving unit are first sequentially selected to write input of coherent data, and then pulse width modulated light emission simultaneously.

The driving method of the light emitting diode display panel provided by the present invention includes: dividing the above light emitting diode display panel equally along the scanning direction of the above light emitting diode display panel to form a plurality of driving units, wherein each driving unit includes multiple columns of pulse width modulation pixels circuit; and sequentially enable the plurality of driving units to form a scanning light-emitting interval of each driving unit; wherein, in the scanning light-emitting interval of each driving unit, the above-mentioned multi-column pulse width modulation pixel circuits are first sequentially activated Select to write coherent data, and then simultaneously pulse width modulate light.

In an embodiment of the present invention, the LED display panel further includes at least one slope signal selection circuit for sequentially enabling each driving unit, so that in the scanning light-emitting interval of each enabled driving unit Each column of pulse width modulation pixel circuits is sequentially selected to write the above-mentioned coherence data, and a multi-slope signal is simultaneously input, so that each column of pulse width modulation pixel circuits simultaneously performs pulse width modulation to emit light.

In an embodiment of the present invention, the slope signal selection circuit includes: a first switch; a second switch; a third switch; a fourth switch; and a fifth switch; wherein each switch has a first end, a second end and a control terminal that determines whether the first terminal and the second terminal are turned on, the first terminal of the first switch is used to receive the above-mentioned multi-slope signal, the second terminal of the first switch, the second terminal of the second switch, and the third switch The first terminal of the first switch, the first terminal of the fourth switch and the first terminal of the fifth switch are electrically connected to a first node, the first terminal of the second switch is used to receive a first DC voltage, and the first terminal of the third switch The two terminals, the second terminal of the fourth switch and the second terminal of the fifth switch are used to receive a second DC voltage, wherein the first DC voltage is different from the second DC voltage.

In an embodiment of the present invention, when the plurality of columns of PWM pixel circuits are sequentially selected to write the coherence data, the first switch, the second switch, the third switch and the first switch of the slope signal selection circuit The fifth switch is turned off, and the control terminal of the fourth switch receives an enable signal of each column of pulse width modulation pixel circuits to enable the fourth switch to be turned on, so that the second terminal of the fourth switch receives the above-mentioned second DC voltage and passes The first node inputs the second DC voltage to each column of PWM pixel circuits.

In an embodiment of the present invention, when the multi-column pulse width modulation pixel circuits are simultaneously input with the multi-slope signals, the second switch, the third switch, the fourth switch and the fifth switch of the above-mentioned slope signal selection circuit are turn off, and the control terminal of the first switch receives a light-emitting signal from each drive unit to enable the first switch to be turned on, so that the first terminal of the first switch receives the above-mentioned multi-slope signal and inputs the above-mentioned multi-slope signal through the first node Up to multi-column PWM pixel circuits.

In an embodiment of the present invention, each pulse width modulation pixel circuit in the plurality of columns of pulse width modulation pixel circuits includes a light emitting diode and a driving circuit connected to drive the light emitting diode.

The invention divides the light emitting diode display panel into multiple driving units due to the use of the slope signal selection circuit, which can reduce the risk of large driving current, reduce the number of scanning groups, and simplify the driving circuit when driving the light emitting diode display panel in a pulse width modulation manner. Design complexity to increase pixel density (PPI).

In order to make the above and other objects, features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

Description of drawings

FIG. 1 is a schematic diagram of a light emitting diode display panel provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram of equally divided driving units and their scan driving light emitting intervals along the scanning direction of the light emitting diode display panel provided by an embodiment of the present invention;

FIG. 3 is a flow chart of a method for driving a light emitting diode display panel provided by an embodiment of the present invention;

4 is a circuit diagram of a slope signal selection circuit provided by an embodiment of the present invention;

FIG. 5 is a timing diagram of scanning and lighting of the slope signal selection circuit provided in FIG. 4;

6 is a schematic diagram of a slope signal selection circuit and a pulse width modulation pixel circuit provided by an embodiment of the present invention;

FIG. 7 is a schematic diagram of the secondary lighting interval in FIG. 6;

8 is a schematic diagram of a slope signal selection circuit and a pulse width modulation pixel circuit provided by another embodiment of the present invention;

FIG. 9 is a schematic diagram of the secondary lighting interval in FIG. 8; and

FIG. 10 is a timing simulation verification diagram of FIG. 6 .

Explanation of reference signs:

1 LED display panel

2 timing control circuit

3 scan drive circuit

4 Data drive circuit

5 PWM pixel circuit

6 Slope signal selection circuit

51 LEDs

52 drive circuit

61 First switch

62 Second switch

63 Third switch

64 Fourth switch

65 fifth switch

A1[PZi] first node

Unit 1～Unit 16 drive unit

PZ 1～PZ 16 scanning luminescent interval

SC 1～SC 16 scanning area

EM 1～EM 16 Luminous area

DATA_PWM coherence data

G1(PZi_n) enable signal

G1(PZi_n-1) enable signal

G2(PZi) enable signal

DC_L First DC voltage

DC_H Second DC voltage

EM[PZ1] Luminous signal

EM[PZi] Luminescent signal

EM[PZ(i+1)] luminescent signal

EM[PZ(i-1)] luminescent signal

MSS multi-slope signal

PWM current pulse width modulation current

S1,S3 steps

Detailed ways

Hereinafter, the present invention will be described in detail by illustrating various embodiments of the invention with accompanying drawings. However, inventive concepts may be embodied in many different forms and should not be construed as limited to the illustrative embodiments set forth herein. Furthermore, the same reference numerals may be used to denote similar elements in the drawings.

Please refer to Fig. 1, the light-emitting diode (LED) display panel 1 provided by the present invention includes a timing control circuit 2, a scan driving circuit 3, a data driving circuit 4, and M-column pulse width modulation pixel circuits 5, wherein the timing The controller is connected to the scan driving circuit 3 and the data driving circuit 4 , and the M-column pulse width modulation pixel circuits 5 are connected to the scanning driving circuit 3 and the data driving circuit 4 . The timing control circuit 2 is used to control the scanning driving circuit 3 and the data driver 4, and the scanning driving circuit 3 is used to output scanning pulses to drive the scanning lines in the light-emitting diode display panel 1 to load display data into the corresponding pulse width modulation pixel circuits 5 , the data driver 4 is used to charge the storage capacitor in the corresponding pulse width modulation pixel circuit 5 according to the data voltage of the display data, and each pulse width modulation pixel circuit 5 in the M columns in the light emitting diode display panel 1 is used to charge the storage capacitor according to the data voltage of the display data. The corresponding data voltage emits light. In addition, the light emitting diode display panel 1 includes M columns of pulse width modulation pixel circuits 5 , for example, for the light emitting diode display panel 1 with a resolution of 1920*960, M=960. For the convenience of the following description, the LED display panel 1 in FIG. 1 includes an example of 960 columns of PWM pixel circuits for illustration, but the number is not intended to limit the present invention.

Please refer to FIG. 2 and FIG. 3 , the LED display panel 1 includes a plurality of drive units Unit 1-Unit x equally divided along the scanning direction of the LED display panel 1, wherein each drive unit Unit 1-Unit x includes multiple columns of PWM pixel circuits 5 (step S1 ), so that the upper limit of the current of each driving unit Unit 1 -Unit x must be less than 10A. In this embodiment, the LED display panel 1 is equally divided into 16 driving units Unit 1 -Unit 16 , but the number is not intended to limit the present invention. Those skilled in the art should be able to carry out related designs according to actual needs or applications. For example, the external quantum efficiency (EQE) of light-emitting diodes is 35μA, the total current of the display panel is 1920*960*35μA=64A, and the light-emitting diode display panel 1 is equally divided into 16 driving units Unit1-Unit16, so that the current of each driving unit Unit1-Unit16 is 64A/16=4A less than the upper limit of the current. Therefore, accumulation of a large driving current of the LED display panel 1 can be avoided. Moreover, each driving unit Unit 1-Unit 16 includes 60 (=960/16) columns of pulse width modulation pixel circuits 5, and each driving unit Unit 1-Unit 16 is sequentially enabled to form a Scanning light-emitting intervals PZ1-PZ16, and each scanning light-emitting interval PZ1-PZ16 includes scanning areas SC1-SC16 and light-emitting areas EM1-EM16 respectively, and first, each column of pulse width modulation pixel circuits 5 in each scanning area SC1 ~SC 16 are sequentially selected to write coherent data, and then each column of pulse width modulation pixel circuits 5 simultaneously performs pulse width modulation in each light emitting area EM 1 ~ EM 16 to emit light (step S3), wherein Coherence data is display data having the same modulation. In addition, it can be noted that the drive unit Unit 1 has the operation of unwritten data and pulse width modulation light emission in the scanning light-emitting interval PZ9, and other drive units Unit 2 ~ Unit 16 also have the same operation, and the operation of this part will be The content will be explained later.

Please refer to FIG. 4 and FIG. 5 at the same time, the light-emitting diode display panel 1 also includes at least one slope signal selection circuit 6, which is connected to the pulse width modulation pixel circuits 5 of M columns, and is used to sequentially enable each driving unit Unit 1 ~Unit 16, so that in each scanning light-emitting interval PZ1~PZ16 of each enabled driving unit Unit 1~Unit 16, the pulse width modulation pixel circuit 5 of each column is sequentially selected to write the coherence data , and a multi-slope signal MSS (multislope signal) is simultaneously input, and these pulse-width-modulated pixel circuits 5 are simultaneously pulse-width-modulated to emit light. It should be noted that the slope signal selection circuit 6 of the present invention can divide the LED display panel 1 into a plurality of driving units Unit 1-Unit 16, and divide the scanning light-emitting intervals PZ1-PZ16 of each driving unit into scanning areas. SC 1-SC 16 and light-emitting areas EM 1-EM 16 can reduce the risk of large driving current, reduce the number of scanning groups, simplify the design complexity of the driving circuit, and increase the pixel size when driving the light-emitting diode display panel in a pulse width modulation manner. density. As shown in FIG. 5 , the slope signal selection circuit 6 enables the drive unit Unit 1, so that the 60-column pulse width modulation pixel circuits 5 of the drive unit Unit 1 are selected, and are scanned in the scanning light-emitting interval PZ1 of the drive unit Unit 1. In zone SC1, the pulse width modulation pixel circuits 5 of each column are sequentially selected to write the coherence data DATA_PWM, and in the light emitting zone EM1 of the scanning light emitting zone PZ1 of the driving unit Unit 1, the pulse width modulation pixel circuits 5 of each column The width modulation pixel circuit 5 simultaneously inputs multi-slope signals and performs pulse width modulation to emit light. In addition, the process of enabling the other drive units Unit 2 -Unit 16 by the slope signal selection circuit 6 is the same as that of enabling the drive unit Unit 1 by the slope signal selection circuit 6 , so no more details are given here. It can be noted that the driving unit Unit 9 has no data written and pulse width modulated light-emitting operations in the scanning light-emitting interval PZ1, and the operation of this part will be described later.

The slope signal selection circuit 6 includes a first switch 61 , a second switch 62 , a third switch 63 , a fourth switch 64 , and a fifth switch 65 . Wherein, each switch 61-65 has a first terminal, a second terminal and a control terminal for determining whether the first terminal and the second terminal are turned on. The first terminal of the first switch 61 is used to receive the multi-slope signal MSS. The second terminal of the switch 61, the second terminal of the second switch 62, the first terminal of the third switch 63, the first terminal of the fourth switch 64 and the first terminal of the fifth switch 65 are electrically connected to the first node A1 , the first end of the second switch 62 is used to receive a first DC voltage (DC_L), the second end of the third switch 63, the second end of the fourth switch 64 and the second end of the fifth switch 65 are used to receive A second DC voltage (DC_H), wherein the first DC voltage (DC_L) is different from the second DC voltage (DC_H).

In detail, when the pulse width modulation pixel circuits 5 of each column are sequentially selected to write coherent data, the first switch 61, the second switch 62, the third switch 63 and the fifth switch of the slope signal selection circuit 6 The switch 65 is turned off, and the control terminal of the fourth switch 64 receives an enable signal G1 (PZi_n) of each column of pulse width modulation pixel circuits to turn on the fourth switch 64, wherein i=1～16, n=1～60 , so as to receive the second DC voltage (DC_H) from the second end of the fourth switch 64 and input the second DC voltage (DC_H) to the PWM pixel circuit 5 of each column through the first node A1. And when the pulse width modulation pixel circuits 5 of 60 columns are simultaneously input with the multi-slope signal MSS, the second switch 62, the third switch 63, the fourth switch 64 and the fifth switch 65 of the slope signal selection circuit 6 are turned off, and The control end of the first switch 61 receives a light emitting signal EM[PZ1] from the drive unit Unit 1 to turn on the first switch 61, so that the first end of the first switch 61 receives the multi-slope signal MSS and passes through the first node A1 Input the multi-slope signal MSS to the pulse width modulation pixel circuit 5 of each column.

Please refer to FIG. 6 , the pulse width modulation pixel circuit 5 connected to the slope signal selection circuit 6 is only an example, wherein each of the pulse width modulation pixel circuits 5 in each column includes a light emitting diode 51 and is connected to drive the light emitting diode 51 However, the circuit structure and the number and types of components are not intended to limit the present invention. Those skilled in the art should be able to select or design different PWM pixel circuits according to actual needs or applications. In this embodiment, the control terminal of the first switch 61 in the slope signal selection circuit 6 receives the light emitting signal EM[PZi] of the drive units Unit 1-Unit 16, and the control terminal of the second switch 62 receives the light-emitting signal EM[PZi] of the drive units Unit 1-Unit 16. 16 light emitting signal EM[PZ(i+1)], the control terminal of the third switch 63 receives the light emitting signal EM[PZ(i-1)] of the drive units Unit 1～Unit 16, and the control terminal of the fourth switch 64 receives It is connected to the enable signal G1 (PZi_n) of the current column pulse width modulation pixel circuit 5, and the control terminal of the fifth switch 65 receives the enable signal G1 (PZi_n-1) of the previous column pulse width modulation pixel circuit 5, where i= 1-16, n=1-60.

Please refer to FIG. 7 , when the light emitting brightness of the LED display panel 1 is insufficient, the LED display panel 1 must emit light again. However, the light-emitting diode display panel 1 of the present disclosure does not need to reload the coherence data, but the slope signal selection circuit 6 uses the control terminal of the third switch 63 to receive the light-emitting signal EM[PZ(i-1 )], so that the third switch 63 is turned on to input the second direct current voltage (DC_H) to each column pulse width modulation pixel circuit 5, and let each column pulse width modulation pixel circuit 5 input the second direct current voltage (DC_H) again to again Perform pulse width modulation to emit light, as shown in Figure 2, the drive unit Unit 1 does not write the coherence data DATA_PWM in the scanning area SC 9 of the scanning light emitting interval PZ9, but performs pulse width modulation light again in the light emitting area EM 9, and as shown in the figure The driving unit Unit 9 in 5 and 7 does not write the coherence data DATA_PWM in the scanning zone SC1 of the scanning light emitting zone PZ1, but performs pulse width modulation light emission in the light emitting zone EM1.

Please refer to FIG. 8 , some pins in FIG. 8 that are the same as those in FIG. 6 are marked with the same reference numerals, so details thereof will not be described in detail here. Wherein, as shown in FIG. 8 , the first end of the second switch 62 of the slope signal selection circuit 6 receives the second DC voltage (DC_H) and the control end receives the enable signal G2 (PZi) of the driving units Unit 1 to Unit 16, The second terminal of the third switch 63, the second terminal of the fourth switch 64 and the second terminal of the fifth switch 65 are used to receive the first DC voltage (DC_L), and the control terminal of the third switch 63 receives the drive unit Unit 1 ~Emission signal EM[PZ(i+1)] of Unit 16, where i=1~16.

Please refer to FIG. 9 , when the light emitting brightness of the LED display panel 1 is insufficient, the LED display panel 1 must emit light again. However, the LED display panel 1 of the present disclosure does not need to reload the display data, but allows the PWM (pulse width modulation), PAM (pulse amplitude modulation), and EM (emission signal) in FIG. The way of the device signal, and a PWM_G boost function is added to lower the loaded data voltage, so that the slope signal selection circuit 6 uses the control terminal of the second switch 62 to receive the enabling signal G2 of the driving units Unit 1-Unit 16, The second switch 62 is turned on to input the second direct current voltage (DC_H) to each column of pulse width modulation pixel circuit 5, and each column of pulse width modulation pixel circuit 5 is allowed to input the second direct current voltage (DC_H) again to perform pulse width modulation again. Modulated light emission, as shown in the figure, the drive unit Unit 1 performs pulse width modulation light emission in the light emission area EM9 again, and the drive unit Unit 9 in the figure performs pulse width modulation light emission in the light emission area EM1.

Please refer to FIG. 10 , which is a timing simulation verification diagram of FIG. 6 . When the control terminals of the first switch 61 in the slope signal selection circuit 6 respectively receive the light emitting signals EM[PZi] of the drive units Unit 1 to Unit 16, the first switch 61 is enabled and the multi-slope signal MSS is input to each drive unit. Each column of the units Unit 1-Unit 16 pulse-width-modulates the pixel circuit 5 so that the pulse-width modulation current (PWM current) outputs a milliamp level, where i=1-16. Through this simulation, the feasibility of dividing the LED display panel into multiple driving units in the present invention is verified to provide a resolution/high pixel density LED display panel.

In summary, because the present invention divides the light emitting diode display panel into multiple driving units and adopts a slope signal selection circuit, it can reduce the risk of large driving current and simplify the driving when driving the light emitting diode display panel in a pulse width modulation manner. The design complexity of the circuit reduces the number of scan groups and simplifies the design complexity of the driving circuit to increase the pixel density (PPI). It can also modulate the light multiple times to increase the luminance of the light-emitting diode display panel.

Although the present invention has been disclosed as above with the embodiments, it is not intended to limit the present invention. Those skilled in the art of the present invention can make some changes and modifications without departing from the concept and scope of the present invention. Therefore, the present invention The scope of protection of the invention should be defined by the claims.

Claims (12)

1. A light emitting diode display panel, comprising: A plurality of driving units are equally divided along the scanning direction of the light-emitting diode display panel, and each driving unit includes multiple columns of pulse width modulation pixel circuits; At least one slope signal selection circuit is used to sequentially enable each of the driving units, so that in the scanning light-emitting interval of each of the enabled driving units, each column of pulse width modulation pixel circuits is sequentially selected to write coherent data, and simultaneously input a multi-slope signal, so that each column of pulse width modulation pixel circuits simultaneously performs pulse width modulation to emit light; Wherein, each of the driving units is sequentially enabled to form a scanning light-emitting interval of each of the driving units; Wherein, in the scanning light-emitting interval of each of the driving units, the plurality of columns of pulse-width-modulated pixel circuits are first selected sequentially to write in-homogeneity data, and then perform pulse-width-modulated light emission simultaneously; Wherein the slope signal selection circuit includes: a first switch; a second switch; a third switch; a fourth switch; and a fifth switch; wherein each switch has a first end, a second end and determines the first end and the second end The control terminal of whether the terminal is conducting, the first terminal of the first switch is used to receive the multi-slope signal, the second terminal of the first switch, the second terminal of the second switch, the first terminal of the third switch, the fourth switch The first terminal of the first switch and the first terminal of the fifth switch are electrically connected to a first node, the first terminal of the second switch is used to receive a first DC voltage, the second terminal of the third switch, the first terminal of the fourth switch The two terminals and the second terminal of the fifth switch are used for receiving a second DC voltage, wherein the first DC voltage is different from the second DC voltage. 2. The light emitting diode display panel as claimed in claim 1, wherein when the plurality of columns of PWM pixel circuits are sequentially selected to write the coherence data, the first switch of the slope signal selection circuit, The second switch, the third switch and the fifth switch are turned off, and the control end of the fourth switch receives an enabling signal of each column of pulse width modulation pixel circuits to turn on the fourth switch, so that the fourth switch can be turned on by the first The second terminal of the four switches receives the second DC voltage and inputs the second DC voltage to each column of PWM pixel circuits through the first node. 3. The LED display panel as claimed in claim 1, wherein when the multi-column PWM pixel circuits are simultaneously input with the multi-slope signal, the second switch and the third switch of the slope signal selection circuit , the fourth switch and the fifth switch are turned off, and the control end of the first switch receives a light-emitting signal from each of the drive units to turn on the first switch, so that the first switch of the first switch The terminal receives the multi-slope signal and inputs the multi-slope signal to the multi-column PWM pixel circuits through the first node. 4. A driving method of a light-emitting diode display panel, the driving method comprising: dividing the light emitting diode display panel equally along the scanning direction of the light emitting diode display panel to form a plurality of driving units, wherein each driving unit includes multiple columns of pulse width modulation pixel circuits; and enabling each of the driving units in sequence to form a scanning light-emitting interval of each of the driving units; Wherein, in the scanning light-emitting interval of each of the driving units, the plurality of columns of pulse-width-modulated pixel circuits are first selected sequentially to write in-homogeneity data, and then perform pulse-width-modulated light emission simultaneously; Wherein the light emitting diode display panel further includes at least one slope signal selection circuit, which is used to sequentially enable each of the driving units, so that in the scanning light-emitting interval of each of the enabled driving units, each column pulse The width modulation pixel circuits are sequentially selected to write the coherence data, and a multi-slope signal is simultaneously input, so that each column of pulse width modulation pixel circuits simultaneously performs pulse width modulation to emit light; Wherein the slope signal selection circuit includes: a first switch; a second switch; a third switch; a fourth switch; and a fifth switch; wherein each switch has a first end, a second end and determines the first end and the second end The control terminal of whether the terminal is conducting, the first terminal of the first switch is used to receive the multi-slope signal, the second terminal of the first switch, the second terminal of the second switch, the first terminal of the third switch, the fourth switch The first terminal of the first switch and the first terminal of the fifth switch are electrically connected to a first node, the first terminal of the second switch is used to receive a first DC voltage, the second terminal of the third switch, the first terminal of the fourth switch The two terminals and the second terminal of the fifth switch are used for receiving a second DC voltage, wherein the first DC voltage is different from the second DC voltage. 5. The driving method as claimed in claim 4, wherein when the plurality of columns of PWM pixel circuits are sequentially selected to write the coherent data, the first switch, the second switch of the slope signal selection circuit The second switch, the third switch and the fifth switch are turned off, and the control end of the fourth switch receives an enabling signal of each column of pulse width modulation pixel circuits so that the fourth switch is turned on, so that the fourth switch The second terminal of the second terminal receives the second direct current voltage and inputs the second direct current voltage to each column of pulse width modulation pixel circuits through the first node. 6. The driving method according to claim 4, wherein when the multi-column pulse width modulation pixel circuits are simultaneously input with the multi-slope signal, the second switch, the third switch, and the second switch of the slope signal selection circuit The fourth switch and the fifth switch are turned off, and the control end of the first switch receives a light emitting signal from each of the drive units to turn on the first switch, so that the first end of the first switch receives The multi-slope signal is input to the multi-column PWM pixel circuits through the first node. 7. A light emitting diode display panel, comprising: A plurality of driving units are equally divided along the scanning direction of the light-emitting diode display panel, and each driving unit includes multiple columns of pulse width modulation pixel circuits; and At least one slope signal selection circuit is used to sequentially enable each of the driving units, so that in the scanning light-emitting interval of each of the enabled driving units, each column of pulse width modulation pixel circuits is sequentially selected to write coherent data, and simultaneously input a multi-slope signal, so that each column of pulse width modulation pixel circuits simultaneously performs pulse width modulation to emit light; Wherein, each of the driving units is sequentially enabled to form a scanning light-emitting interval of each of the driving units; Wherein, in the scanning light-emitting interval of each of the driving units, the plurality of columns of pulse-width-modulated pixel circuits are first selected sequentially to write in-homogeneity data, and then perform pulse-width-modulated light emission simultaneously; Wherein each of the plurality of columns of pulse width modulation pixel circuits includes a light emitting diode and a driving circuit connected to drive the light emitting diode; Wherein the slope signal selection circuit includes: a first switch; a second switch; a third switch; a fourth switch; and a fifth switch; wherein each switch has a first end, a second end and determines the first end and the second end The control terminal of whether the terminal is conducting, the first terminal of the first switch is used to receive the multi-slope signal, the second terminal of the first switch, the second terminal of the second switch, the first terminal of the third switch, the fourth switch The first terminal of the first switch and the first terminal of the fifth switch are electrically connected to a first node, the first terminal of the second switch is used to receive a first DC voltage, the second terminal of the third switch, the first terminal of the fourth switch The two terminals and the second terminal of the fifth switch are used for receiving a second DC voltage, wherein the first DC voltage is different from the second DC voltage. 8. The light emitting diode display panel as claimed in claim 7, wherein when the plurality of columns of PWM pixel circuits are sequentially selected to write the coherence data, the first switch of the slope signal selection circuit, The second switch, the third switch and the fifth switch are turned off, and the control end of the fourth switch receives an enabling signal of each column of pulse width modulation pixel circuits to turn on the fourth switch, so that the fourth switch can be turned on by the first The second terminal of the four switches receives the second DC voltage and inputs the second DC voltage to each column of PWM pixel circuits through the first node. 9. The LED display panel as claimed in claim 7, wherein when the multi-column PWM pixel circuits are simultaneously input with the multi-slope signal, the second switch and the third switch of the slope signal selection circuit , the fourth switch and the fifth switch are turned off, and the control end of the first switch receives a light-emitting signal from each of the drive units to turn on the first switch, so that the first switch of the first switch The terminal receives the multi-slope signal and inputs the multi-slope signal to the multi-column PWM pixel circuits through the first node. 10. A driving method of a light emitting diode display panel, the driving method comprising: dividing the light emitting diode display panel equally along the scanning direction of the light emitting diode display panel to form a plurality of driving units, wherein each driving unit includes a plurality of columns of pulse width modulation pixel circuits; and enabling each of the driving units in sequence to form a scanning light-emitting interval of each of the driving units; Wherein, in the scanning light-emitting interval of each of the driving units, the plurality of columns of pulse-width-modulated pixel circuits are first selected sequentially to write in-homogeneity data, and then perform pulse-width-modulated light emission simultaneously; Wherein each of the plurality of columns of pulse width modulation pixel circuits includes a light emitting diode and a driving circuit connected to drive the light emitting diode; Wherein the light emitting diode display panel further includes at least one slope signal selection circuit, which is used to sequentially enable each of the driving units, so that in the scanning light-emitting interval of each of the enabled driving units, each column pulse The width modulation pixel circuits are sequentially selected to write the coherence data, and a multi-slope signal is simultaneously input, so that each column of pulse width modulation pixel circuits simultaneously performs pulse width modulation to emit light; Wherein the slope signal selection circuit includes: a first switch; a second switch; a third switch; a fourth switch; and a fifth switch; wherein each switch has a first end, a second end and determines the first end and the second end The control terminal of whether the terminal is conducting, the first terminal of the first switch is used to receive the multi-slope signal, the second terminal of the first switch, the second terminal of the second switch, the first terminal of the third switch, the fourth switch The first terminal of the first switch and the first terminal of the fifth switch are electrically connected to a first node, the first terminal of the second switch is used to receive a first DC voltage, the second terminal of the third switch, the first terminal of the fourth switch The two terminals and the second terminal of the fifth switch are used for receiving a second DC voltage, wherein the first DC voltage is different from the second DC voltage. 11. The driving method according to claim 10, wherein when the plurality of columns of PWM pixel circuits are sequentially selected to write the coherence data, the first switch, the second switch of the slope signal selection circuit The second switch, the third switch and the fifth switch are turned off, and the control end of the fourth switch receives an enabling signal of each column of pulse width modulation pixel circuits so that the fourth switch is turned on, so that the fourth switch The second end of the second terminal receives the second direct current voltage and inputs the second direct current voltage to the pulse width modulation pixel circuit of each column through the first node. 12. The driving method according to claim 10, wherein when the multi-column pulse width modulation pixel circuits are simultaneously input with the multi-slope signal, the second switch, the third switch, and the second switch of the slope signal selection circuit The fourth switch and the fifth switch are turned off, and the control end of the first switch receives a light emitting signal from each of the drive units to turn on the first switch, so that the first end of the first switch receives The multi-slope signal is input to the multi-column PWM pixel circuits through the first node.

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