CN101430853B - Driving method of display panel with half-source driving framework - Google Patents

Abstract

The invention provides a driving method of a display panel with a semi-source electrode driving framework, wherein the display panel is provided with at least one pixel, the pixel uses a capacitor to store voltage, one end of the capacitor receives display data input by a data line, and the other end of the capacitor is electrically coupled to a common electrode. The driving method comprises the following steps: obtaining a direct current input power supply; coupling an AC signal with a DC input power source to generate a common electrode driving signal; and providing the common electrode driving signal to the common electrode. Wherein, a rising time occupied by the rising edge and a falling time occupied by the falling edge of the common electrode driving signal are adjusted, so as to improve the vertical line stripe phenomenon of the display panel. The invention changes a rising time occupied by the rising edge and a falling time occupied by the falling edge of the common electrode driving signal, thereby improving the vertical line stripe phenomenon of the display panel.

Description

Driving method of display panel with half-source driving architecture

technical field

The invention relates to the field of flat panel displays, and in particular to a driving method of a display panel with a half-source driving structure.

Background technique

Flat panel displays, such as liquid crystal displays, plasma displays, etc., have the advantages of high image quality, small size, light weight, and wide application range, so they are widely used in consumer electronics such as mobile phones, notebook computers, desktop monitors, and televisions , and has gradually replaced the traditional cathode ray tube display and become the mainstream of the display.

Referring to FIG. 1 , it is a partial circuit diagram of a display panel 10 with a half-source driving structure in the prior art. The display panel 10 includes a plurality of data lines (Data lines) S1-S3, a plurality of gate lines (Gatelines) G1-G10 and a plurality of pixels, each having different colors (RGB) along the direction of the gate lines. Among them, each odd-numbered column (Odd Column) pixel in each pixel row (Pixel Row) and an adjacent even-numbered column (Even Column) pixel are connected to the same data line, but the odd-numbered column pixel is connected to the even-numbered column pixel to two different gate lines. For example, the first column of pixels R and the adjacent second column of pixels G in each pixel row are connected to the data line S1, but the first column of pixels R and the second column of pixels G are connected to two different Gate lines G1, G2.

Based on the above, each pixel uses a storage capacitor Cs to store voltage, one end of the storage capacitor Cs receives the display data input from the data line, and the other end is electrically coupled to a common electrode Vcom; and the common electrode Vcom is applied to the common electrode Vcom The electrode driving signal VCOM1 is usually a square wave signal, as shown in FIG. 3 . Referring to Fig. 2, the square wave signal VCOM1 can be generated through the DC coupling of the AC signal AC1 and the DC input power supply, and the AC signal AC1 can be generated by passing the square wave signal (not shown in the figure) input from the input terminal of the capacitor C1 through the capacitor C1. obtain. Here, the AC signal AC1 has the same waveform as the common electrode driving signal VCOM1 , but the DC component DC is less than that of the common electrode driving signal VCOM1 .

During the display process of the display panel 10 with a half-source driving structure, the gate lines G1-G10 are sequentially turned on, and each data line S1-S3 provides an Pixels successively input display data with opposite polarities; here, a parasitic capacitance (Parasitic Capacitance) exists between these two adjacent pixels. Due to the influence of such parasitic capacitance, the voltage stored in the storage capacitor Cs in the pixel that was input display data earlier will be modulated (Modulated) when another pixel is input display data, so that the voltage stored in the pixel that is charged first There is a difference between the voltage finally stored by the capacitor Cs and the originally designed voltage, which causes the display panel 10 to produce a V-line Mura phenomenon.

Contents of the invention

One of the objectives of the present invention is to provide a method for driving a display panel with a half-source driving structure, so as to improve the vertical line stripe phenomenon of the display panel.

An embodiment of the present invention proposes a method for driving a display panel with a half-source driving structure; wherein, the display panel has at least one pixel, and the pixel uses a capacitor to store voltage, and one end of the capacitor receives display data input from a data line , and the other end is electrically coupled to a common electrode. The driving method includes: obtaining a DC input power; using an AC signal to couple the DC input power to generate a common electrode driving signal; and providing the common electrode driving signal to the common electrode. Wherein, a rising time occupied by the rising edge of the common electrode driving signal and a falling time occupied by the falling edge are adjusted, so as to improve the vertical line stripe phenomenon of the display panel.

In an embodiment of the present invention, the above-mentioned adjustment of the waveform of the common electrode driving signal is achieved by adjusting the waveform of the AC signal.

In an embodiment of the present invention, the above-mentioned AC signal includes a staircase waveform rising and falling in a staircase manner.

In an embodiment of the present invention, at least one rising edge of the AC signal uses more than two different rising speeds, and the later rising speed is slower than the previous rising speed.

In an embodiment of the present invention, at least one falling edge of the AC signal uses more than two different falling speeds, and the later falling speed is slower than the previous falling speed.

In an embodiment of the present invention, the above driving method further includes the steps of: providing a square wave signal; and adjusting the square wave signal to obtain an AC signal. Wherein, the rise time and fall time of the AC signal are longer than the corresponding rise time and fall time of the square wave signal.

In an embodiment of the present invention, the step of adjusting the square wave signal to obtain the AC signal includes: receiving the square wave signal; and transmitting the square wave signal through a signal transmission line, the resistance of the signal transmission line is set to be To achieve the effect of adjusting the square wave signal to obtain the AC signal.

In an embodiment of the present invention, the resistance of the above-mentioned signal transmission line is set to a fixed value.

In an embodiment of the present invention, the resistance of the above-mentioned signal transmission line is set to be adjustable within an adjustment range.

In an embodiment of the present invention, the setting of the resistance of the above-mentioned signal transmission line is obtained according to Y=a*X+d, Y is the rising time or falling time in microseconds, and X is in ohms The resistance of the signal transmission line is 0.015<a<0.12 and 0.01<d<12.

In an embodiment of the present invention, the above-mentioned adjustment of the waveform of the common electrode driving signal is achieved by adjusting the resistance of a signal transmission line transmitting the common electrode driving signal.

Another embodiment of the present invention proposes another method for driving a display panel with a half-source driving structure; wherein, the display panel has at least one pixel, and the pixel uses a capacitor to store voltage, and one end of the capacitor receives input from a data line display data, and the other end is electrically coupled to a common electrode. The driving method includes the step of: adjusting a rising time of a rising edge and a falling time of a falling edge of a common electrode driving signal provided to the common electrode, so as to improve the vertical line stripe phenomenon of the display panel.

Yet another embodiment of the present invention proposes another method for driving a display panel with a half-source drive architecture; wherein, the display panel has at least one pixel, and the pixel uses a capacitor to store voltage, and one end of the capacitor receives input from a data line display data, and the other end is electrically coupled to a common electrode. The driving method includes the steps of: obtaining a DC input power; using a deformed square wave signal to couple the DC input power to generate a common electrode driving signal; and providing the common electrode driving signal to the common electrode. Further, the deformed square wave signal can be a truncated square wave signal, a rounded square wave signal, a stepped square wave signal or other deformed square wave signals.

In the embodiment of the present invention, by adjusting the driving waveform of the common electrode driving signal provided to the common electrode, the rising time occupied by the rising edge and the falling time occupied by the falling edge of the common electrode driving signal can be changed, thereby improving the display panel. vertical line streaks.

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

Description of drawings

FIG. 1 is a partial circuit diagram of a display panel with a half-source driving architecture in the prior art.

FIG. 2 is a method for generating a common electrode driving signal in the prior art.

FIG. 3 is an enlarged waveform diagram of the driving signal of the common electrode in FIG. 2 .

FIG. 4 is a method for generating a common electrode driving signal according to an embodiment of the present invention.

FIG. 5 is an enlarged waveform diagram of an AC signal in FIG. 4 .

FIG. 6 is an enlarged waveform diagram of another AC signal according to an embodiment of the present invention.

FIG. 7 is a graph showing the relationship between the rising time of the rising edge of the common electrode driving signal and the resistance of a plurality of display panels.

FIG. 8 is another method for generating a common electrode driving signal according to an embodiment of the present invention.

FIG. 9 is an enlarged waveform diagram of another AC signal according to an embodiment of the present invention.

The reference numerals in the above-mentioned accompanying drawings are explained as follows:

10: Display panel with half-source drive architecture

S1～S3: data line

G1～G10: Gate lines

Cs: storage capacitor

Vcom: common electrode

C1: capacitance

DC: DC input power

AC1, AC2: AC signal

VCOM1, VCOM2: common electrode drive signal

R1: Resistor

VR1: variable resistor

tr: rise time

tf: fall time

ΔV: voltage difference

Detailed ways

An embodiment of the present invention provides a driving method of a display panel with a half-source driving structure. The display panel (refer to FIG. 1 ) has a plurality of pixels, and each pixel uses a storage capacitor to store voltage. One end of the capacitor receives display data input from a data line, and the other end is electrically coupled to a common electrode.

Referring to Fig. 4 and Fig. 5, the driving method provided by this embodiment includes the following steps (1) to (3):

(1) Obtain a direct current input power supply DC.

(2) Use an AC signal AC2 to couple the DC input power supply DC to generate a common electrode drive signal VCOM2. Figure 5 shows the waveform of the AC signal AC2, which is a corner-cut square wave signal. The rise of the AC signal AC2 The rising time occupied by the edge (that is, the time required for the voltage to change from low level to high level, where the voltage difference between the low level and the high level is ΔV) is tr, and the falling time occupied by the falling edge (also That is, the time required for the voltage to change from high level to low level) is tf. It can be understood that since the common electrode driving signal VCOM2 is generated by coupling the AC signal AC2 to the DC input power supply DC, the common electrode driving signal VCOM2 has the same waveform as the AC signal AC2, but the DC component DC is added.

Comparing FIG. 5 with FIG. 3 , it can be seen that the common electrode driving signal VCOM2 is a deformed square wave signal compared to the common electrode driving signal VCOM1 in FIG. 3 . Specifically, a rising time occupied by the rising edge of the common electrode drive signal VCOM2 (equal to the rising time tr occupied by the rising edge of the AC signal AC) and a falling time occupied by the falling edge (equal to the falling time tr occupied by the falling edge of the AC signal AC The occupied fall time tf) is adjusted so that the vertical line streak phenomenon of the display panel is improved.

Wherein, the adjustment of the waveform of the common electrode driving signal VCOM2 is achieved by adjusting the waveform of the AC signal AC2. Specifically, the waveform adjustment step of the AC signal AC2 includes: providing a square wave signal, as shown in FIG. 4 ; and transmitting the square wave signal through a signal transmission line to obtain the AC signal AC2. The signal transmission line includes capacitor C1 and resistor R1. The square wave signal is received by the input terminal of capacitor C1. The resistance R1 of the signal transmission line is set to achieve the effect of adjusting the square wave signal to obtain the AC signal AC2 and is a fixed value. . Since the AC signal AC2 is a truncated square wave signal, its rise time tr and fall time tf are both increased, ie longer than the corresponding rise time and fall time of the received square wave signal.

(3) Provide the common electrode driving signal VCOM2 to the common electrode, refer to Vcom in FIG. 1 , so as to improve the vertical line stripe phenomenon of the display panel.

Furthermore, the AC signal AC2 in the above-mentioned embodiment of the present invention is not limited to the truncated square wave signal shown in FIG. wave signal. Wherein, the rounded square wave signal shown in FIG. 6 can be realized by setting the value of the resistor R1 of the signal transmission line in FIG. 4 .

For the situation in which the value of the resistor R1 of the signal transmission line is used to adjust the AC signal AC2 in the above embodiment, FIG. 7 shows the rise time of the common electrode drive signal VCOM2 and the value of the resistor R1 for multiple different display panels. The experimental results of the relationship curve. The intercept d on the vertical axis of each relationship curve in FIG. 7 is the rise time of the output common electrode driving signal VCOM2 when the resistor R1 is not provided. By doing simple linear fitting to each relationship curve in Fig. 7, a linear equation can be obtained: Y=a*X+d; wherein, Y is the rise time in microseconds (μs), and X is the rise time in ohms (Ω ) is the resistance value of the signal transmission line in units of 0.015<a<0.12 and 0.01<d<12μs. In this way, when the value of the resistor R1 satisfies the linear equation, the waveform of the AC signal AC2 can be adjusted to a predetermined shape, thereby achieving the purpose of improving the vertical line stripe phenomenon of the display panel. It can be seen from Figure 5 and Figure 6 that the falling edge and rising edge of the common electrode driving signal VCOM2 have similar waveforms, so the falling time of the common electrode driving signal VCOM2 and the value of the resistor R1 also satisfy the above linear equation Y=a *X+d.

In addition, the resistance R1 of the signal transmission line in Figure 4 can also be changed to the variable resistance VR1 shown in Figure 8, so that the resistance value of the signal transmission line can be adjusted within an adjustment range, and the AC signal AC2 can also be adjusted The waveform is adjusted to a predetermined pattern, thereby achieving the purpose of improving the vertical line stripe phenomenon of the display panel.

It should be noted that the AC signal AC2 is not limited to the acquisition of the above-mentioned signal transmission line to transmit the square wave signal, and the signal transmission line including the capacitor C1 and the resistor R1 (or VR1) shown in FIG. 4 and FIG. 8 may not be used. , but use a signal source to directly provide a truncated square wave signal as shown in FIG. 5 , a rounded square wave signal as shown in FIG. 6 , a stepped square wave signal as shown in FIG. 9 or other deformed square wave signals. More specifically, the rising edge of the truncated square wave signal in Figure 5 uses two different rising speeds (corresponding to two different straight line slopes), and the later rising speed is slower than the previous rising speed; the falling edge also uses Two different descending speeds, and the later descending speed is slower than the former descending speed. The rounded square wave signal in Figure 6 can be regarded as its rising edge uses a variety of different rising speeds (corresponding to multiple different tangent slopes), and the later rising speed is slower than the previous rising speed; the falling edge also uses A variety of different falling speeds, and the later falling speed is slower than the previous falling speed. As for the staircase-shaped square wave signal in FIG. 9 , it includes a staircase-shaped waveform that rises and falls in a stepwise manner.

In another embodiment of the present invention, the adjustment of the waveform of the common electrode driving signal VCOM2 is achieved by adjusting the resistance of a signal transmission line transmitting the common electrode driving signal, rather than by adjusting the waveform of the AC signal AC2 as described above. of.

Specifically, when the common electrode driving signal does not flow through the signal transmission line whose resistance is adjusted, the waveform of the common electrode driving signal VCOM2 can be a square wave waveform as shown in FIG. 3; and when the common electrode driving signal VCOM2 flows through the resistance After the adjusted signal is transmitted through the line, its waveform will be adjusted to a deformed square wave, such as the truncated square wave shown in FIG. 5 or the rounded square wave shown in FIG. 6 . Among them, after the resistance of the signal transmission line is adjusted, its resistance value can also satisfy the linear equation: Y=a*X+d; where Y is the rise time in microseconds (μs), X is the ohm (Ω) is the resistance value of the signal transmission line in units of 0.015<a<0.12 and 0.01<d<12. In addition, for the resistance adjustment of the signal transmission line transmitting the common electrode driving signal VCOM2, for example, the transmission line of the common electrode driving signal VCOM2 on the substrate can be changed to a snake-like shape to increase its length, and an appropriate line can be provided. Impedance is realized by cutting one of the multiple transmission lines (Cut-off) or using a transmission line with a smaller line width during design.

To sum up, the embodiment of the present invention adjusts the driving waveform of the common electrode driving signal provided to the common electrode, so that a rising time occupied by the rising edge and a falling time occupied by the falling edge of the common electrode driving signal can be changed, Furthermore, the vertical line streak phenomenon of the display panel can be improved.

Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some changes without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection should be based on the scope defined by the appended claims.

Claims (23)

1. driving method with display panel of semi-source pole driving architecture, wherein this display panel has at least one pixel, this pixel uses an electric capacity with storage voltage, one termination of this electric capacity is received the video data by data line input, the other end is electrically coupled to community electrode, and this driving method comprises:

Obtain a direct-current input power supplying;

Use an AC signal to be coupled this direct-current input power supplying to produce the community electrode drive signal; And

Provide this common electrode drive signal to this common electrode, wherein, the shared decline time of rise time that the rising edge of this common electrode drive signal is shared and negative edge is increased, to improve the perpendicular line striped phenomenon of this display panel whereby.

2. driving method as claimed in claim 1, wherein the adjustment of the waveform of this common electrode drive signal is reached by the waveform of adjusting this AC signal.

3. driving method as claimed in claim 2 also comprises the following steps:

One square-wave signal is provided; And

Adjust this square-wave signal and must this AC signal, wherein, this rise time of this AC signal and this fall time than in this square-wave signal corresponding should the rise time and this fall time long.

4. driving method as claimed in claim 3, wherein adjust this square-wave signal and step that must this AC signal comprises:

Receive this square-wave signal; And

This square-wave signal is transmitted by a signal transmission line, and the resistance of this signal transmission line is set to and can reaches the effect of adjusting this square-wave signal and must this AC signal.

5. driving method as claimed in claim 4, wherein the resistance of this signal transmission line is set to fixed value.

6. driving method as claimed in claim 4, wherein the resistance of this signal transmission line is set to and can adjusts in a setting range.

7. driving method as claimed in claim 4, wherein the setting of the resistance of this signal transmission line is to get according to Y=a*X+d, Y for the microsecond be unit this rise time or should fall time, X is for being the resistance of this signal transmission line of unit with ohm, 0.015＜a＜0.12 and 0.01＜d＜12.

8. driving method as claimed in claim 2, wherein this AC signal comprises the stepped waveform with the step-wise manner rise and fall.

9. driving method as claimed in claim 2, wherein at least one rising edge of this AC signal uses two or more different ascending velocity, and the ascending velocity of the ascending velocity before relatively is slow.

10. driving method as claimed in claim 2, wherein at least one negative edge of this AC signal uses two or more different decline rates, and the decline rate of the decline rate before relatively is slow.

11. driving method as claimed in claim 1, wherein the adjustment of the waveform of this common electrode drive signal is to reach by the resistance of adjusting a signal transmission line that transmits this common electrode drive signal.

12. driving method with display panel of semi-source pole driving architecture, wherein this display panel has at least one pixel, this pixel uses an electric capacity with storage voltage, one termination of this electric capacity is received the video data by data line input, the other end is electrically coupled to community electrode, and this driving method is characterised in that and comprises the following steps:

Increase provides to a rise time of the rising edge of the community electrode drive signal of this common electrode and a decline time of negative edge, to improve the perpendicular line striped phenomenon of this display panel.

13. driving method as claimed in claim 12 also comprises the following steps:

Use an AC signal to be coupled a direct-current input power supplying to produce this common electrode drive signal.

14. driving method as claimed in claim 13, wherein adjusting provided to this rise time of the rising edge of this common electrode drive signal of this common electrode and this fall time of negative edge, was to reach by adjusting this AC signal.

15. driving method as claimed in claim 14 also comprises:

The resistance of an employed signal transmission line when adjusting this AC signal of transmission is so that the waveform of this AC signal is adjusted to a predetermined form.

16. driving method as claimed in claim 15, wherein the setting of the resistance of this signal transmission line is to get according to Y=a*X+d, Y for the microsecond be unit this rise time or should fall time, X is for being the resistance of this signal transmission line of unit with ohm, 0.015＜a＜0.12 and 0.01＜d＜12.

17. driving method as claimed in claim 13, wherein this AC signal comprises the stepped waveform with the step-wise manner rise and fall.

18. driving method as claimed in claim 13, wherein

Make at least one rising edge of this AC signal use two or more different ascending velocity, and the ascending velocity of the ascending velocity before relatively is slow; And

Make at least one negative edge of this AC signal use two or more different decline rates, and the decline rate of the decline rate before relatively is slow.

19. driving method as claimed in claim 12 adjusts wherein that to provide to the step of this common electrode drive signal of this common electrode be that the resistance of an employed signal transmission line is reached when adjusting this common electrode drive signal of transmission.

20. driving method as claimed in claim 19, wherein the setting of the resistance of this signal transmission line is to get according to Y=a*X+d, Y for the microsecond be unit this rise time or should fall time, X is for being the resistance of this signal transmission line of unit with ohm, 0.015＜a＜0.12 and 0.01＜d＜12.

21. driving method with display panel of semi-source pole driving architecture, wherein this display panel has at least one pixel, this pixel uses an electric capacity with storage voltage, one termination of this electric capacity is received the video data by data line input, the other end is electrically coupled to community electrode, and this driving method comprises:

Obtain a direct-current input power supplying;

Use the square-wave signal of a distortion to be coupled this direct-current input power supplying to produce the community electrode drive signal; And

Provide this common electrode drive signal to this common electrode.

22. driving method as claimed in claim 21, wherein the square-wave signal of this distortion is a rescinded angle square-wave signal, a fillet square-wave signal or a stepped square-wave signal.

23. driving method as claimed in claim 21, wherein providing of the square-wave signal of this distortion comprises step:

Receive a square-wave signal; And

This square-wave signal is transmitted by a signal transmission line, and the resistance of this signal transmission line is set to the effect that can reach the square-wave signal of adjusting this square-wave signal and must this distortion.

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