CN111243484A

CN111243484A - Driving method of double-grid panel for eliminating straight lines

Info

Publication number: CN111243484A
Application number: CN202010115914.8A
Authority: CN
Inventors: 徐铭霞
Original assignee: Fujian Huajiacai Co Ltd
Current assignee: Fujian Huajiacai Co Ltd
Priority date: 2020-02-25
Filing date: 2020-02-25
Publication date: 2020-06-05

Abstract

The invention provides a driving method of a double-grid panel for eliminating straight stripes, which is applied to the double-grid panel, wherein the double-grid panel comprises a plurality of rows of pixel points, and each row of pixel points is controlled by an upper grid line and a lower grid line, and the driving method comprises the following steps: and sequentially opening and closing one grid line in one row of pixel points. And after the grid line is closed, opening and closing another grid line of the pixel points in the row. And when the gate line is opened, sending corresponding data to the pixel point. The technical scheme is used for ensuring that the sub-pixels controlled by one gate line in the double-gate panel are not influenced by the other gate line, so that the brightness is changed. The inventor staggers the opening time of two gate lines, namely, when one gate line is completely closed, the other gate line is opened. So as to eliminate the straight stripe phenomenon of panel display.

Description

Driving method of double-grid panel for eliminating straight lines

Technical Field

The invention relates to the field of display screens, in particular to a driving method of a double-gate panel for eliminating straight stripes.

Background

The dual-gate technology is applied to the mobile phone panel, which can reduce the lower frame of the panel, but compared with the conventional single-gate panel, the gate wiring of the dual-gate panel coupled to the pixel electrode can cause the display of the panel to have straight lines, please refer to fig. 1 to 3.

Referring to fig. 2, since two gate lines are disposed between two adjacent rows of pixel points of the dual-gate panel, as shown by the dotted line frame in fig. 2, it can be seen that the gate lines and the pixel electrodes are overlapped, so that the pixel electrodes are easily coupled by the gate lines.

Taking the first row R, G of D1 as an example, as shown in fig. 3, the G2 trace couples to the red sub-pixel. The conventional CK waveform is shown in fig. 4, and the corresponding signal waveforms of G1 and G2 are shown in fig. 5. After the red sub-pixel is charged by G1, it is affected by the coupling of the falling edge of G2. Due to the influence of the coupling of the falling edges, the data voltage of the red sub-pixel is lower in both positive and negative frames, and finally the bestvom ratio of the red sub-pixel is smaller when not coupled; the green sub-pixel is charged by G2, and the G1 signal does not rise or fall after the charging is completed, so that the coupling is not performed, and finally the best VCOM value of the green sub-pixel does not deviate.

Similarly, for the whole panel, as shown in fig. 6, G2, G4, G6 and G8 couple pixels charged by G1, G3, G5 and G7 respectively, that is, bestvom of sub-pixels at positions in a frame is small, bestvom values of sub-pixels at positions in the frame are not changed, and the panel can only set a uniform VCOM value, so that some sub-pixels cannot be in bestvom states, and brightness is not consistent compared with the sub-pixels in bestvom states, which finally results in straight lines appearing on the panel display.

Disclosure of Invention

Therefore, it is necessary to provide a driving method of a dual gate panel for eliminating the straight stripe phenomenon in the panel display.

In order to achieve the above object, the present invention provides a driving method of a dual gate panel for eliminating straight stripes, which is applied to the dual gate panel, the dual gate panel includes a plurality of rows of pixels, each row of pixels is controlled by an upper gate line and a lower gate line, and the method includes the steps of:

sequentially opening and closing one grid line in a row of pixel points;

after the grid line is closed, the other grid line of the pixel point in the row is opened and closed;

and when the gate line is opened, sending corresponding data to the pixel point.

Furthermore, according to the row sequence of the panel, one gate line in one row of pixel points is sequentially turned on and off in stages.

Further, the method comprises the following steps:

sequentially opening and closing one grid line in one row of pixel points until the opening and closing of one grid line in all the rows of pixel points are finished;

and then sequentially opening and closing the other gate line of the row of pixel points according to the opening and closing sequence of the pixel points.

Further, the gate lines are driven by clock signal lines.

Further, the falling time of the gate line signal is extended so that the rising time and the falling time of the gate line signal are the same.

Furthermore, chamfering processing is carried out on the driving signal of the gate line when the gate line is closed, and the middle level is prolonged for a period of time.

Different from the prior art, the technical scheme is to ensure that the sub-pixels controlled by one gate line in the dual-gate panel are not influenced by the other gate line, so that the brightness is changed. The inventor staggers the opening time of two gate lines, namely, when one gate line is completely closed, the other gate line is opened. It should be noted that the sub-pixel is still coupled to the other gate line during the period when the other gate line is turned on, but is restored after being turned off. Taking G1 and G2 as examples, to solve the problem that the coupling effect of the falling edge of G2 on the red subpixel after the charging of G1 results in smaller bestmom, the waveform diagram of the G2 signal is shifted backward, and the waveform diagram of the shift backward is shown in fig. 7, it can be seen that the rising edge and the falling edge of G2 both couple the red (R) subpixel in the sustain region, the rising edge couples the red subpixel to result in larger bestmom value, the falling edge couples the red subpixel to result in smaller bestmom value, and finally the bestmom shift phenomenon is balanced to keep the same value as that when the red subpixel is not coupled. So as to eliminate the straight stripe phenomenon of panel display.

Drawings

FIG. 1 is a prior art dual gate panel architecture;

FIG. 2 is a dual gate panel in-plane layout;

FIG. 3 is a diagram of R, G subpixels in the prior art;

FIG. 4 is a waveform diagram of a clock signal line of the prior art;

FIG. 5 is a signal waveform diagram of the prior art G1, G2;

FIG. 6 is a diagram of a prior art dual gate panel structure;

FIG. 7 is a signal waveform diagram of G1 and G2 according to the present invention;

FIG. 8 is a waveform diagram of the clock signal lines of the present invention;

FIG. 9 is a waveform of signals G1-G8 according to the present invention;

FIG. 10 is a schematic diagram showing a waveform of a gate signal;

FIG. 11 is a waveform diagram of a clock signal line after the chamfering process according to the present invention.

Description of reference numerals:

1. a sub-pixel.

Detailed Description

To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.

Referring to fig. 5 and 7, in the present embodiment, a driving method of a dual gate panel for eliminating straight stripes is provided, which is applied to a dual gate panel, the dual gate panel includes a plurality of rows of pixels, each row of pixels is controlled by an upper gate line and a lower gate line, and the method includes the steps of: and sequentially opening and closing one grid line in one row of pixel points. And after the grid line is closed, opening and closing another grid line of the pixel points in the row. And when the gate line is opened, sending corresponding data to the pixel point. The technical scheme is used for ensuring that the sub-pixels controlled by one gate line in the double-gate panel are not influenced by the other gate line, so that the brightness is changed. The inventor staggers the opening time of two gate lines, namely, when one gate line is completely closed, the other gate line is opened. It should be noted that, during the period when the other gate line is turned on, the sub-pixel still generates the coupling phenomenon with it, but is restored after it is turned off, and in the present invention, the gate lines are all driven by the clock signal line. Taking G1 and G2 as examples, in order to solve the problem that bestmom is smaller due to the coupling effect of the falling edge of G2 after the red subpixel is charged by G1, the invention shifts the waveform of the G2 signal backward, and the schematic diagram of the shifted waveform is shown in fig. 7, it can be seen that the rising edge and the falling edge of G2 are both coupled to the red subpixel in the sustain region, the bestmom value is larger due to the coupling of the rising edge to the red subpixel, and the bestmom value is smaller due to the coupling of the falling edge to the red subpixel, and finally the bestmom shift phenomenon is balanced to keep the same as the value when the red subpixel is not coupled.

Note that the on period of G2 will be in the maintenance zone in G1. Similarly, the waveforms of the signals G4, G6, and G8 … are shifted backward, so that the bestVCOM values are kept consistent over the entire surface. To achieve the waveform shift of G2, G4, G6, G8 …, etc., the clock signal line (CK) is adjusted, as shown in fig. 8, and the time period for which each gate line is turned on is the same; and gate line on generates CK, i.e., G1 on generates CK 1. Due to the short falling edge time, the down coupling time is not enough and cannot reach bestVCOM, but the generated bright stripes are not easy to be recognized by human eyes, so that the phenomenon of straight stripes generated by panel display is eliminated.

Referring to fig. 6 and 8, in some embodiments, a driving method of a dual gate panel for eliminating striations sequentially turns on and off a gate line in a row of pixels in a row-by-row manner according to a row sequence of the panel. Taking 8 gate lines (G1, G2, G3, G4, G5, G6, G7 and G8) as an example, the method comprises the following specific steps: gate lines (G1, G3, G5, G7, G2, G4, G6 and G8 …) which are sequentially opened according to the cycle of the Nth row, the N +2, the N +4, the N +6 …, the N +1, the N +3, the N +5 and the N +7 …, wherein the opening time of the gate line of the Nth +1 row is positioned after the closing time of the gate line of the Nth row or when the gate line of the Nth row is closed; the closing time of the gate line of the (N + 1) th row is before the second opening time of the Nth row, or when the gate line of the Nth row is opened. Specifically, the invention designs a new CK waveform, the opening sequence of the gate lines is changed into the opening of the gate lines such as G1, G3, G5, G7, G2, G4, G6 and G8 …, G2, G4, G6 and G8 … are delayed, so that the rising edges and the falling edges of G2, G4, G6 and G8 … couple G1, G3, G5 and G7 …, and the offset of bestVCOM is balanced. Please refer to fig. 8 and 9, in the present embodiment, the continuous 8 gate lines are a cyclic sequence, and the first row is the starting row of the gate lines in the cyclic sequence. The 8 grid lines are a cyclic sequence, so that signals can be utilized in unit time more efficiently, and the integrity and the definition of a picture are improved.

In this embodiment, a driving method of a dual gate panel for eliminating straight stripes may further include: and sequentially opening and closing one grid line in one row of pixel points until the opening and closing of one grid line of all the rows of pixel points are finished. And then sequentially opening and closing the other gate line of the row of pixel points according to the opening and closing sequence of the pixel points. Namely, one grid line in each row of pixel points is sequentially opened in sequence, and the other grid line in each row of pixel points is sequentially opened in sequence after one grid in all the row of pixel points is opened.

Of course, in some embodiments, one gate line in each row of pixel points may also be turned on out of the row sequence, such as: g1, G5, G7 and G3 … are firstly started, and then G2, G6, G8 and G4 … are started, so that the requirements are met: and sequentially opening and closing one grid line in one row of pixel points. And after the grid line is closed, opening and closing another grid line of the pixel points in the row.

Referring to fig. 10 and 11, in some embodiments, the gate lines are chamfered when turned off. Since the actual waveforms of G1, G2 …, etc. have different rise times and fall times, the rise time is generally longer than the fall time, as shown in fig. 10, Tr represents the rise time and Tf represents the fall time. Since Tr ≠ Tf causes inconsistency between the coupling amount of the rising edge and the coupling amount of the falling edge, and cannot completely balance the shift of bestcom, it is necessary to further adjust the waveform of the clock signal line (CK) as described above, and a CK waveform diagram is proposed, as shown in fig. 11, to perform chamfering processing on the falling edge of the clock signal line (CK), so as to increase the time of the falling edge of CK, so that Tr ═ Tf is achieved, and the effect of completely balancing bestcom shift is achieved. It should be noted that the middle level is left for a while to eliminate the time difference between T r and Tf, thereby eliminating the straight stripe phenomenon caused by the gate-coupled pixels on the dual panel.

It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present invention.

Claims

1. A driving method of a double-grid panel for eliminating straight stripes is applied to the double-grid panel, the double-grid panel comprises a plurality of rows of pixel points, and each row of pixel points is controlled by an upper grid line and a lower grid line, and the driving method is characterized by comprising the following steps:

sequentially opening and closing one grid line in a row of pixel points;

2. The driving method of dual gate panel for eliminating striae recti according to claim 1, wherein one gate line in a row of pixels is turned on and off in sequence in a stepwise manner according to the row sequence of the panel.

3. The driving method of dual gate panel for eliminating striae, as claimed in claim 1 or 2, comprising the steps of:

4. The driving method of dual gate panel with straight stripes eliminated as recited in claim 1, wherein the gate lines are driven by clock signal lines.

5. The driving method of dual gate panel with straight stripes eliminated as recited in claim 1, wherein the falling time of the gate line signal is extended such that the rising time and the falling time of the gate line signal are the same.

6. The driving method of dual gate panel with straight stripes eliminated as recited in claim 5, wherein said gate line driving signal is chamfered when it is turned off.