TWI789942B - Display panel under spread spectrum clock and driving method thereof - Google Patents

Abstract

A display panel under spread spectrum clock and a driving method thereof are provided. The driving method includes the following steps. A frequency of a clock signal (GCLK) is spread so that a clock frequency of the clock signal is periodically modulated on a plurality of scan lines. The frequency of the clock signal is controlled so that the frequencies of the clock signal at corresponding positions of a first frame and a second frame are complementary. As such, the brightness at the corresponding positions of the first frame and the second frame is complementary.

Description

Display panel under spread frequency and its driving method

The present disclosure relates to a display panel and its driving method, and in particular to a spread-spectrum display panel and its driving method.

With the development of display technology, various display panels are constantly being introduced. During the driving process of the display panel, each scanning line is driven by a clock signal (GCLK). Moreover, the brightness of each scanning line is controlled by a pulse width modulation signal (PWM).

In order to improve the phenomenon of electromagnetic interference, researchers propose a spread spectrum technology to eliminate electromagnetic interference. However, the researchers found that under the spread spectrum technology, water ripples will occur on the display panel, which seriously affects the display quality.

This disclosure relates to a display panel under spread frequency and its driving method, which controls the clock frequency of the clock signal to be complementary at the corresponding position between the first frame and the second frame, so that the first frame and the second frame are corresponding Where the brightness is complementary. in the visual moment Under the remaining phenomenon, the user can feel the stable brightness without the occurrence of water ripples.

According to an aspect of the present disclosure, a driving method of a display panel under spread spectrum is provided. The driving method of the display panel includes the following steps. Spectrum spreading is performed on a clock signal (GCLK), so that a clock frequency of the clock signal is periodically modulated on several scanning lines. The clock frequency of the control clock signal is complementary at the corresponding position of a first picture and a second picture, so that the brightness of the corresponding position of the first picture and the second picture is complementary.

According to another aspect of the present disclosure, a display panel under spread spectrum is provided. The display panel includes a frequency spreading circuit and a control circuit. The spreading circuit is used for spreading a clock signal (GCLK), so that a clock frequency of the clock signal is periodically modulated on several scanning lines. The control circuit is used for controlling the clock frequency of the clock signal to be complementary at the corresponding positions of a first frame and a second frame, so that the brightness of the corresponding positions of the first frame and the second frame are complementary.

In order to have a better understanding of the above and other aspects of the present disclosure, the following specific embodiments are described in detail in conjunction with the attached drawings as follows:

110: Spread spectrum circuit

120: control circuit

121: Calculation unit

122: Signal processing unit

130: Temporary memory

140:PWM signal generation circuit

150: output circuit

1000: display panel

F_c: first frame

F_d: second picture

GCLK0, GCLK1, GCLK_a, GCLK_b: clock signal

L1, L2, L3, L26, L27, L28, L29, L30: scan lines

PWM_a, PWM_b: pulse width modulation signal

Ra, Rb: time interval

S110, S120, S210, S220, S230, S240, S250, S260: steps

SF1, SF2: sub frame

SN11, SN21, SN31, SN41, SN51: first scan timing

SN12, SN22, SN32, SN42, SN52: second scan timing

Tframe: screen scanning time

T21, T22, T41, T42, T51, T52: time points

Trest: delay time

Tr, Tr_c, Tr_d: remainder time

Ts: timing adjustment signal

Tsb: sub-frame scanning time

Tshift1: the first shift amount

Tshift2: the second shift amount

Tssc: Spread spectrum cycle

Tscan: line scan time

Ty: Persistence of vision time

Wa, Wb: opening width

FIG. 1 shows a relationship diagram between a clock signal (GCLK) and a pulse width modulation signal (PWM) according to an embodiment.

FIG. 2 shows a schematic diagram of a display panel according to an embodiment.

FIG. 3 is a diagram illustrating the brightness relationship between a first frame and a second frame according to an embodiment.

FIG. 4 is a flow chart of a driving method of a display panel according to an embodiment.

FIG. 5 illustrates an example of step S120.

FIG. 6 illustrates another example of step S120.

FIG. 7 illustrates another example of step S120.

FIG. 8 illustrates another example of step S120.

FIG. 9 illustrates another example of step S120.

FIG. 10 exemplifies the flow chart of the method for setting the first movement amount and the second movement amount.

Figure 11 illustrates the relationship between the first screen and the second screen.

Please refer to FIG. 1 , which shows the relationship between the clock signal (GCLK) and the pulse width modulation signal (PWM) according to an embodiment. In spread spectrum technology, one of the clock signals, the clock frequency, is modulated. As shown in FIG. 1 , the clock frequency of the clock signal GCLK_a is, for example, 10 MHz, and the clock frequency of the clock signal GCLK_b is, for example, 8 MHz. When both the pulse width modulation signal PWM_a and the pulse width modulation signal PWM_b are 2T, the pulse width modulation signal PWM_a has an opening width Wa, and the pulse width modulation signal PWM_b has an opening width Wb. When the pulse width modulation signal PWM_a adopts the turn-on width Wa, the scan line is turned on for a time period Ra; when the pulse width modulation signal PWM_b takes the turn-on width Wb, the scan line is turned on for a time period Rb. It is clear Yes, the turn-on width Wb of the pulse width modulation signal PWM_b is greater than the turn-on width Wa of the pulse width modulation signal PWM_a, causing the time interval Rb to be greater than the time interval Ra, thereby making the brightness of each scanning line different.

Please refer to FIG. 2 , which shows a schematic diagram of a display panel 1000 according to an embodiment. The display panel 1000 includes a frequency spreading circuit 110 , a control circuit 120 , a temporary storage memory 130 , a PWM signal generating circuit 140 and an output circuit 150 . The control circuit 120 includes a computing unit 121 and a signal processing unit 122 . The spectrum spreading circuit 110 is used for spreading the frequency of a clock signal GCLK0 so as to periodically modulate a clock frequency of the output clock signal GCLK1 in several scanning lines.

Please refer to FIG. 3 , which shows a brightness relation diagram of a first frame F_c and a second frame F_d according to an embodiment. The first frame F_c and the second frame F_d are, for example, two adjacent frames. Each of the first frame F_c and the second frame F_d has several sub-frames SF1 , SF2 , . . . . Each sub-frame SF1 , SF2 , . . . has several scan lines L1 , L2 , L3 . . . (the number of scan lines is not limited to the present invention). The bar graph represents the brightness of each scan line L1, L2, L3, . . . When the frequency of the clock signal GCLK1 is low, higher brightness will be generated; when the frequency of the clock signal GCLK1 is higher, lower brightness will be generated.

In Figure 3, the scanning lines L1, L2, L3, ... of the first frame F_c and the second frame F_d are aligned (the clock signal GCLK1 is not aligned), so as to facilitate the representation of the first frame F_c and the second frame The corresponding situation of the two frames F_d. In this technology, the control circuit 120 controls the clock frequency of the clock signal GCLK1 to complement the corresponding positions of the first frame F_c and the second frame F_d, so that the brightness of the first frame F_c and the second frame F_d at the corresponding positions complementary. "Complementary" in this case means that the higher one corresponds to the lower one, and the lower one corresponds to the higher one, so that the combination of the two can be substantially equal at each corresponding place.

FIG. 4 shows a flowchart of a driving method of the display panel 1000 according to an embodiment. According to the above description, the driving method of the display panel 1000 in this embodiment includes steps S110 and S120. In step S110 , the spectrum spreading circuit 110 spreads the clock signal GCLK0 so that the clock frequency of the output clock signal GCLK1 is periodically modulated on the scanning lines L1 , L2 , L3 , . . . . In step S120, the control circuit 120 controls the clock frequency of the clock signal GCLK1 to complement the first frame F_c and the second frame F_d (each scanning line L1, L2, L3, . . . ), so that the first The luminances of the first frame F_c and the second frame F_d at corresponding positions (each scanning line L1, L2, L3, . . . ) are complementary.

Once each corresponding position of the first frame F_c and the second frame F_d (each scanning line L1, L2, L3, ...) can complement each other in brightness, under the phenomenon of persistence of vision, the user can feel to a stable brightness without water ripples.

Please refer to FIG. 2 , the clock frequency of the clock signal GCLK1 output by the spread spectrum circuit 110 is periodically modulated on the scan lines L1 , L2 , L3 , . . . The calculation unit 121 of the control circuit 120 is used for outputting a timing adjustment signal Ts. The signal processing unit 122 controls the clock signal GCLK1 according to the timing adjustment signal Ts, so that the clock frequency of the clock signal GCLK1 is complementary at the corresponding positions of the first frame F_c and the second frame F_d.

Various implementations in which the clock frequency of the clock signal GCLK1 is complementary at the corresponding positions of the first frame F_c and the second frame F_d are further described below.

Please refer to FIG. 5, which illustrates an example of step S120. As shown in FIG. 5 , the periodically modulated clock signal GCLK1 has a spreading period Tssc. first screen F_c and the second frame F_d each require a frame scanning time Tframe. Each scan line L1, L2, L3, . . . requires a one-line scan time Tscan. In the example in Figure 5, the screen scan time Tframe is K1 times the spread spectrum period Tssc (Tframe=K1*Tssc), the spread spectrum period Tssc is K2 times the line scan time Tscan (Tssc=K2*Tscan), and K1 is A positive integer, K2 is a positive integer and an even number. In the example of FIG. 5, K2 is 6, for example.

As shown in the top diagram of FIG. 5 , in the first frame F_c, a periodically modulated clock signal GCLK1 is provided to the scan lines L1 , L2 , L3 , . . . according to a first scan timing SN11 .

As shown in the bottom diagram of FIG. 5 , in the second frame F_d, a periodically modulated clock signal GCLK1 is provided to the scan lines L1 , L2 , L3 , . . . according to a second scan timing SN12 .

As shown in FIG. 5 , the scan sequence of the first scan sequence SN11 is scan line L1 , scan line L2 , scan line L3 , . . . , scan line L28 , scan line L29 , and scan line L30 . The scan sequence of the second scan sequence SN12 is scan line L28 , scan line L29 , scan line L30 , scan line L1 , scan line L2 , . . . , scan line L26 , scan line L27 .

Compared with the first scan sequence SN11 , the start scan line of the second scan sequence SN12 is moved from the scan line L1 to the scan line L28 . That is to say, compared with the first scan sequence SN11 , the start scan line of the second scan sequence SN12 is shifted by 0.5*K2 scan lines (ie, 3 scan lines).

As shown in Figure 5, under the same periodically modulated clock signal GCLK1, the clock frequency of the clock signal GCLK1 is the lowest value on the scanning line L1 of the first frame F_c, and the clock frequency of the clock signal GCLK1 The scanning line L1 of the second frame F_d has the highest frequency value, and the corresponding positions of the two are complementary. The clock frequency of the clock signal GCLK1 is the highest value on the scan line L28 of the first frame F_c, and the clock frequency of the clock signal GCLK1 is the lowest value on the scan line L28 of the second frame F_d, and the corresponding positions of the two are complementary.

The clock frequency of the clock signal GCLK1 is complementary at the corresponding positions of the first frame F_c and the second frame F_d (each scanning line L1, L2, L3, . . . ), so that the first frame F_c and the second frame F_d are The luminances of the corresponding positions (each scanning line L1, L2, L3, . . . ) are complementary. Under the phenomenon of persistence of vision, users can feel stable brightness without water ripples.

Please refer to FIG. 6, which illustrates another example of step S120. As shown in Figure 6, the screen scan time Tframe is K1 times the spread spectrum period Tssc (Tframe=K1*Tssc), the spread spectrum period Tssc is K2 times the line scan time Tscan (Tscan=K2*Tssc), K1 is positive Integer, K2 is a positive integer and an odd number. K2 is 7, for example.

As shown in the top diagram of FIG. 6 , in the first frame F_c, a periodically modulated clock signal GCLK1 is provided to the scan lines L1 , L2 , L3 , . . . according to a first scan timing SN21 .

As shown in the bottom diagram of FIG. 6 , in the second frame F_d, a periodically modulated clock signal GCLK1 is provided to the scan lines L1 , L2 , L3 , . . . according to a second scan timing SN22 .

As shown in FIG. 6 , the initial scan time of the first scan sequence SN21 is time point T21 . The start scan time of the second scan sequence SN12 is the time point T22.

Compared with the first scan sequence SN21 , the start scan time of the second scan sequence SN22 is shifted from the time point T21 to the time point T22 . The time point T22 is the midpoint of the first spreading period Tssc. That is to say, compared with the first scan sequence SN21 , the start scan time of the second scan sequence SN22 is shifted by 0.5 times of the spreading period Tssc.

As shown in Figure 6, under the same periodically modulated clock signal GCLK1, the clock frequency of the clock signal GCLK1 is the lowest value on the scan line L1 of the first frame F_c, and the clock frequency of the clock signal GCLK1 The frequency of the scanning line L1 of the second frame F_d is the highest value, and the corresponding positions of the two are complementary. The clock frequency of the clock signal GCLK1 is the lowest value on the scanning line L28 of the first frame F_c, and the clock frequency of the clock signal GCLK1 is the highest value on the scanning line L28 of the second frame F_d, and the corresponding positions of the two are complementary.

The clock frequency of the clock signal GCLK1 is complementary at the corresponding positions of the first frame F_c and the second frame F_d (each scanning line L1, L2, L3, . . . ), so that the first frame F_c and the second frame F_d are The luminances of the corresponding positions (each scanning line L1, L2, L3, . . . ) are complementary. Under the phenomenon of persistence of vision, users can feel stable brightness without water ripples.

Please refer to FIG. 7, which illustrates another example of step S120. As shown in FIG. 7, each sub-frame SF1, SF2, . . . requires a sub-frame scanning time Tsb. In the example in Figure 7, the screen scan time Tframe is K1 times the spread spectrum period Tssc (Tframe=K1*Tssc), and the spread spectrum period Tssc is greater than twice the sub-frame scan time Tsb (Tssc>2*Tsb), K1 is a positive integer.

As shown in the top diagram of FIG. 7 , in the first frame F_c, a periodically modulated clock signal GCLK1 is provided to the scan lines L1 , L2 , L3 , . . . according to a first scan timing SN31 .

As shown in the top diagram of FIG. 7 , in the second frame F_d, a periodically modulated clock signal GCLK1 is provided to the scan lines L30 , L29 , L28 , . . . according to a second scan timing SN32 .

As shown in FIG. 7 , the scan sequence of the first scan sequence SN31 is scan line L1 , scan line L2 , scan line L3 , . . . , scan line L28 , scan line L29 , scan line L30 . The scan sequence of the second scan sequence SN32 is scan line L30 , scan line L29 , scan line L28 , . . . , scan line L3 , scan line L2 , scan line L1 .

Compared with the first scan sequence SN31 , the scan order of the second scan sequence SN32 is opposite.

As shown in Figure 7, under the same periodically modulated clock signal GCLK1, the clock frequency of the clock signal GCLK1 is the highest value on the scan line L1 of the first frame F_c, and the clock frequency of the clock signal GCLK1 The frequency of the scanning line L1 of the second frame F_d is the lowest value, and the corresponding positions of the two are complementary. The clock frequency of the clock signal GCLK1 is the lowest value on the scanning line L30 of the first frame F_c, and the clock frequency of the clock signal GCLK1 is the highest value on the scanning line L30 of the second frame F_d, and the corresponding positions of the two are complementary.

The clock frequency of the clock signal GCLK1 is complementary at the corresponding positions of the first frame F_c and the second frame F_d (each scanning line L1, L2, L3, . . . ), so that the first frame F_c and the second frame F_d are Brightness of the corresponding position (each scan line L1, L2, L3, ...) complementary. Under the phenomenon of persistence of vision, users can feel stable brightness without water ripples.

Please refer to FIG. 8, which illustrates another example of step S120. As shown in Figure 8, in the example in Figure 8, the screen scanning time Tframe is K1 times the spreading period Tssc (Tframe=K1*Tssc), and the spreading period Tssc is greater than twice the sub-frame scanning time Tsb (Tssc >2*Tsb), K1 is a positive integer.

As shown in the top diagram of FIG. 8 , in the first frame F_c, a periodically modulated clock signal GCLK1 is provided to the scan lines L1 , L2 , L3 , . . . according to a first scan timing SN41 .

As shown in the top diagram of FIG. 8 , in the second frame F_d, a periodically modulated clock signal GCLK1 is provided to the scan lines L30 , L29 , L28 , . . . according to a second scan timing SN42 .

As shown in FIG. 8, the scanning sequence of the first scanning sequence SN41 is scanning line L1, scanning line L2, scanning line L3, . . . , scanning line L28, scanning line L29, scanning line L30. The initial scan time of the first scan sequence SN41 is the time point T41. The scan sequence of the second scan sequence SN42 is scan line L30 , scan line L29 , scan line L28 , . . . , scan line L3 , scan line L2 , scan line L1 . The start scan time of the second scan sequence SN42 is the time point T42.

Compared with the first scan sequence SN41 , the scan order of the second scan sequence SN42 is reversed, and the start scan time is moved from the time point T41 to the time point T42 . That is to say, the initial scan time of the second scan sequence SN42 is shifted by a delay time Trest, and the delay time Trest is less than 0.5 times the difference between the spread spectrum period Tssc and the sub-frame scan time Tsb.

As shown in Figure 8, under the same periodically modulated clock signal GCLK1, the clock frequency of the clock signal GCLK1 is the highest value on the scan line L1 of the first frame F_c, and the clock frequency of the clock signal GCLK1 The frequency of the scanning line L1 of the second frame F_d is the lowest value, and the corresponding positions of the two are complementary. The clock frequency of the clock signal GCLK1 is the lowest value on the scanning line L30 of the first frame F_c, and the clock frequency of the clock signal GCLK1 is the highest value on the scanning line L30 of the second frame F_d, and the corresponding positions of the two are complementary.

The clock frequency of the clock signal GCLK1 is complementary at the corresponding positions of the first frame F_c and the second frame F_d (each scanning line L1, L2, L3, . . . ), so that the first frame F_c and the second frame F_d are The luminances of the corresponding positions (each scanning line L1, L2, L3, . . . ) are complementary. Under the phenomenon of persistence of vision, users can feel stable brightness without water ripples.

Please refer to FIG. 9, which illustrates another example of step S120. As shown in FIG. 9, the frame scan time Tframe is not divisible by the spread spectrum period Tssc.

As shown in the middle diagram of FIG. 9, in the first frame F_c, a periodically modulated clock signal GCLK1 is provided to the scan lines L1, L2, L3, . . . according to a first scan timing SN51.

As shown in the bottom diagram of FIG. 9 , in the second frame F_d, a periodically modulated clock signal GCLK1 is provided to the scan lines L1 , L2 , L3 , . . . according to a second scan timing SN52 . The first frame F_c is, for example, an odd frame, and the second frame F_d is, for example, an even frame.

As shown in FIG. 9 , the start scan time of the first scan sequence SN51 is time point T51 . The start scan time of the second scan sequence SN52 is the time point T52.

The initial scan time of the first scan sequence SN51 is shifted by a first shift amount Tshift1, the initial scan time of the second scan sequence SN52 is shifted by a second shift amount Tshift2, and the first shift amount Tshift1 is different from the second shift amount Tshift2 .

The frame before the first frame F_c has a remainder time Tr_c of the spreading period Tssc, and the remainder time Tr_c is not fixed, it depends on the condition of the previous frame. The remaining time Tr_c refers to the time that is less than one spreading period Tssc. The frame before the second frame F_d has a remainder time Tr_d of the spreading period Tssc, and the remainder time Tr_d is not fixed, it depends on the condition of the previous frame. The remaining time Tr_d refers to the time less than one spreading period Tssc.

If the remaining time Tr_c is less than 0.5 times the spreading period Tssc, then the first shift Tshift1 is the difference between 0.5 times the spreading period Tssc and the remaining time Tr_c; if the remaining time Tr_c is not less than 0.5 times the spreading period Tssc, then the first A shift amount Tshift1 is the difference between the spread spectrum period Tssc of 1.5 times and the remainder time Tr_c. The second shift amount Tshift2 is the difference between the spreading period Tssc and the remainder time Tr_d. The difference between the first shift amount Tshift1 and the second shift amount Tshift2 is 0.5 times the spreading period Tssc.

As shown in Figure 9, under the same periodically modulated clock signal GCLK1, the clock frequency of the clock signal GCLK1 is the highest value on the scan line L1 of the first frame F_c, and the clock frequency of the clock signal GCLK1 The frequency of the scanning line L1 of the second frame F_d is the lowest value, and the corresponding positions of the two are complementary. The clock frequency of the clock signal GCLK1 is the lowest value on the scanning line L28 of the first frame F_c, and the clock frequency of the clock signal GCLK1 is the highest value on the scanning line L28 of the second frame F_d, and the corresponding positions of the two are complementary.

The clock frequency of the clock signal GCLK1 is complementary at the corresponding positions of the first frame F_c and the second frame F_d (each scanning line L1, L2, L3, . . . ), so that the first frame F_c and the second frame F_d are The luminances of the corresponding positions (each scanning line L1, L2, L3, . . . ) are complementary. Under the phenomenon of persistence of vision, users can feel stable brightness without water ripples.

In one embodiment, the control circuit 120 sets the first shift amount Tshift1 and the second shift amount Tshift2 through the following process, for example. Please refer to FIG. 10 , which illustrates a flow chart of a method for setting the first shift amount Tshift1 and the second shift amount Tshift2 . In step S210, the calculation unit 121 of the control circuit 120 calculates the remaining time Tr_c, Tr_d according to the frame scanning time Tframe and the spreading period Tssc.

Next, in step S220, the signal processing unit 122 of the control circuit 120 determines whether the object to be processed is the first frame F_c or the second frame F_d. If the object to be processed is the first frame F_c, go to step S230; if the object to be processed is the second frame F_d, go to step S260.

In step S230, the signal processing unit 122 of the control circuit 120 further determines whether the remaining time Tr_c is less than 0.5 times the spreading period Tssc. If the remaining time Tr_c is less than 0.5 times the spreading period Tssc, go to step S250; if the remaining time Tr_c is not less than 0.5 times the spreading period Tssc, go to step S260.

In step S240 , the signal processing unit 122 of the control circuit 120 sets the first shift amount Tshift1 to be the difference between the spread spectrum period Tssc of 0.5 times and the remainder time Tr_c.

In step S250, the signal processing unit 122 of the control circuit 120 sets the first shift amount Tshift1 to be the difference between the spread spectrum period Tssc and the remainder time Tr_c which is 1.5 times.

In step S260, the signal processing unit 122 of the control circuit 120 sets the second shift amount Tshift2 to be the difference between the spreading period Tssc and the remainder time Tr_d.

Please refer to FIG. 11 , which illustrates the relationship between the first frame F_c and the second frame F_d. In the above various embodiments, the first frame F_c and the second frame F_d may be adjacent frames or non-adjacent frames. As shown in FIG. 11 , as long as the scanning time difference between the first frame F_c and the second frame F_d is within the duration of vision Ty, a visually stable brightness effect can be achieved.

To sum up, although the present disclosure has been disclosed above with embodiments, it is not intended to limit the present disclosure. Those with ordinary knowledge in the technical field to which this disclosure belongs may make various changes and modifications without departing from the spirit and scope of this disclosure. Therefore, the scope of protection of this disclosure should be defined by the scope of the appended patent application.

F_c: first frame

F_d: second screen

GCLK1: clock signal

L1, L2, L3: scan lines

SF1, SF2: sub frame

Tssc: Spread spectrum cycle

Tscan: line scan time

Claims (20)

A method for driving a display panel under spread frequency, including: spreading a clock signal (GCLK), so that one clock frequency of the clock signal is periodically modulated on a plurality of scanning lines; and controlling the clock signal The clock frequency is complementary at a corresponding position between an adjacent first frame and a second frame, so that the brightness of the adjacent first frame and the corresponding second frame are complementary. The driving method of the display panel under the frequency spread as described in claim 1, wherein the periodically modulated clock signal has a frequency spread period, the first frame and the second frame each require a frame scan time, and each of the Scanning lines require one line of scanning time; in the first frame, the periodically modulated clock signal is provided to the scanning lines according to a first scanning timing; in the second frame, periodic modulation is provided in accordance with a second scanning timing The modulated clock signal is sent to the scanning lines; if the scanning time of the picture is K1 times of the spreading period, the spreading period is K2 times of the line scanning time, K1 is a positive integer, K2 is a positive integer and is an even number, relative to the first scan sequence, one of the start scan lines of the second scan sequence is moved. The driving method of a display panel under spread frequency according to Claim 2, wherein relative to the first scanning sequence, the start scanning line of the second scanning sequence is shifted by 0.5*K2 of the scanning lines. The driving method of the display panel under the frequency spread as described in claim 1, wherein the periodically modulated clock signal has a frequency spread period, the first frame and the second frame each require a frame scan time, and each of the Scanning lines require one line of scanning time; in the first frame, the periodically modulated clock signal is provided to the scanning lines according to a first scanning timing; in the second frame, periodic modulation is provided in accordance with a second scanning timing The modulated clock signal is sent to the scanning lines; if the scanning time of the picture is K1 times of the spreading period, the spreading period is K2 times of the line scanning time, K1 is a positive integer, K2 is a positive integer and is an odd number, relative to the first scan sequence, one of the start scan times of the second scan sequence is shifted. The driving method of a display panel under spread spectrum according to claim 4, wherein relative to the first scan sequence, the initial scan time of the second scan sequence is shifted by 0.5 times of the spread spectrum period. The driving method of the display panel under the spread frequency as described in claim 1, wherein The periodically modulated clock signal has a frequency spreading period, and the first picture and the second picture need a picture scanning time. Each of the first picture and the second picture has a plurality of sub-picture frames, and each of the sub-pictures The frame requires a sub-frame scan time; in the first frame, provide the periodically modulated clock signal to the scan lines in accordance with a first scan sequence; in the second frame, in accordance with a second scan sequence Provide the periodically modulated clock signal to the scan lines; if the image scan time is K1 times the spread spectrum period, the spread spectrum period is greater than 2 times the sub-frame scan time, K1 is a positive integer, Then, relative to the first scan sequence, the scan order of the second scan sequence is reversed. The driving method of the display panel under the spread frequency as described in claim 6, wherein relative to the first scan sequence, the start scan time of the second scan sequence is shifted by a delay time, and the delay time is less than 0.5 times the spread The difference between the frequency period and the scan time of the sub-frame. The driving method of the display panel under spread frequency as described in claim 1, wherein the periodically modulated clock signal has a spread spectrum period, and the first frame and the second frame each require a frame scan time; In the first frame, the periodically modulated clock signal is provided to the scan lines according to a first scanning timing, and the first frame is an odd frame; in the second frame, the periodically modulated clock signal is provided according to a second scanning timing. changing the clock signal to the scanning lines, the second frame is an even frame; If the frame scanning time is not divisible by the spread spectrum period, the initial scanning time of the first scanning sequence is moved by a first movement amount, and the initial scanning time of the second scanning sequence is moved by a second movement amount, The first amount of movement is different from the second amount of movement. The driving method of the display panel under the spread spectrum according to claim 8, wherein the difference between the first movement amount and the second movement amount is 0.5 times of the spread spectrum period. The driving method of the display panel under the frequency spread as described in Claim 8, wherein the first picture or the picture before the second picture has a remainder time of the frequency spread period; if the remainder time is less than 0.5 times the frequency spread period, then the first movement amount is the difference between 0.5 times the spread spectrum period and the remainder time; if the remainder time is not less than 0.5 times the spread spectrum period, then the first movement amount is 1.5 times the spread spectrum period The difference between the period and the remainder time; the second moving amount is the difference between the spreading period and the remainder time. A display panel under spread frequency, comprising: a spread frequency circuit for spreading a clock signal (GCLK), so that a clock frequency of the clock signal is periodically modulated on a plurality of scanning lines; and a The control circuit is used to control the clock frequency of the clock signal to be complementary at the corresponding position between a first frame and a second frame adjacent to each other, so that the adjacent first frame and the second frame are at the corresponding position The brightness is complementary. The display panel under the spread frequency as described in claim item 11, wherein the control circuit includes a calculation unit and a signal processing unit, the calculation unit is used to output a timing adjustment signal, and the signal processing unit controls the timing according to the timing adjustment signal Pulse signal, the periodically modulated clock signal has a spread spectrum period, the first frame and the second frame each require a frame scan time, and each scan line requires a line scan time; in the first frame, the The signal processing unit provides the periodically modulated clock signal to the scan lines according to a first scan timing; in the second frame, the signal processing unit provides the periodically modulated clock signal according to a second scan timing signal to these scanning lines; if the scanning time of the picture is K1 times of the spread spectrum period, the spread spectrum period is K2 times of the line scan time, K1 is a positive integer, K2 is a positive integer and is an even number, then relative to In the first scan sequence, one of the start scan lines in the second scan sequence is moved. The display panel under spread frequency according to claim 12, wherein relative to the first scan sequence, the start scan line of the second scan sequence is shifted by 0.5*K2 of the scan lines. The display panel under the spread frequency as described in claim item 11, wherein the control circuit includes a calculation unit and a signal processing unit, the calculation unit is used to output a timing adjustment signal, and the signal processing unit controls the timing according to the timing adjustment signal Pulse signal, the periodically modulated clock signal has a spread spectrum period, the first picture Each of the second picture and the second picture needs a picture scan time, and each of the scan lines needs a line scan time; in the first picture, the signal processing unit provides the periodically modulated clock signal to the first picture according to a first scan time sequence the scanning lines; in the second frame, the signal processing unit provides the periodically modulated clock signal to the scanning lines according to a second scanning timing; if the scanning time of the frame is K1 times of the spreading period, The spread frequency period is K2 times of the line scan time, K1 is a positive integer, K2 is a positive integer and odd number, then relative to the first scan time sequence, an initial scan time of the second scan time sequence is shifted. The display panel under spread spectrum according to claim 14, wherein relative to the first scan sequence, the initial scan time of the second scan sequence is shifted by 0.5 times of the spread spectrum period. The display panel under the spread frequency as described in claim item 11, wherein the control circuit includes a calculation unit and a signal processing unit, the calculation unit is used to output a timing adjustment signal, and the signal processing unit controls the timing according to the timing adjustment signal Pulse signal, the periodically modulated clock signal has a spread frequency period, the first picture and the second picture need a picture scanning time, the first picture and the second picture each have a plurality of sub-picture frames, Each sub-frame requires a sub-frame scanning time; in the first frame, the signal processing unit provides the periodically modulated clock signal to the scanning lines according to a first scanning timing; In the second frame, the signal processing unit provides the periodically modulated clock signal to the scan lines according to a second scan timing; if the frame scan time is K1 times the spread spectrum period, the spread spectrum period If the scanning time of the sub-frame is greater than twice, and K1 is a positive integer, then a scanning order of the second scanning timing is opposite to that of the first scanning timing. The display panel under the spread spectrum according to claim 16, wherein relative to the first scan sequence, the start scan time of the second scan sequence is shifted by a delay time, and the delay time is less than 0.5 times the spread spectrum period and The difference between the subframe scan times. The display panel under the spread frequency as described in claim item 11, wherein the control circuit includes a calculation unit and a signal processing unit, the calculation unit is used to output a timing adjustment signal, and the signal processing unit controls the timing according to the timing adjustment signal Pulse signal, the periodically modulated clock signal has a spread spectrum period, the first frame and the second frame each require a frame scan time; in the first frame, the signal processing unit follows a first scan timing Provide the periodically modulated clock signal to the scan lines, the first frame is an odd frame; in the second frame, the signal processing unit provides the periodically modulated clock signal according to a second scan timing To these scan lines, the second frame is an even frame; if the frame scan time is not divisible by the spread spectrum period, the initial scan time of the first scan sequence is shifted by a first shift amount, and the second scan The initial scan time of the sequence is shifted by a second shift amount, and the first shift amount is different from the second shift amount. The display panel under the spread spectrum according to claim 18, wherein the difference between the first movement amount and the second movement amount is 0.5 times of the spread spectrum period. The display panel under the spread spectrum as described in claim 18, wherein the first picture or the picture before the second picture has a remainder time of the spread spectrum period; if the remainder time is less than 0.5 times the spread spectrum period, then The first moving amount is the difference between 0.5 times the spreading period and the remaining time; if the remaining time is not less than 0.5 times the spreading period, then the first moving amount is 1.5 times the spreading period and the The difference between the remaining time; the second moving amount is the difference between the spreading period and the remaining time.

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