CN100382137C - Driving method of liquid crystal display panel - Google Patents

Abstract

A driving method for a liquid crystal display panel is used to display a picture having a first field and a second field on the liquid crystal display panel. The driving method transmits the scan line data of the picture to the liquid crystal display panel by line pair method, and cooperates with the line inversion driving of the liquid crystal display panel to display the picture. Therefore, the driving method of the present invention does not need to use additional memory and complex algorithms as in the prior art, and can increase the resolution of the display picture.

Description

Driving method of liquid crystal display panel

technical field

The invention relates to a driving method of a liquid crystal display panel, and in particular relates to a driving method of a liquid crystal display panel for displaying television signals.

Background technique

Most TV signals use interlacing, that is, each frame of the TV signal is composed of an odd field and an even field, and the scanning of one frame The lines are interleaved between the scan lines of another field.

FIG. 1 is a schematic diagram of an interlaced television signal. Please refer to Figure 1. For example, taking the NTSC TV system as an example, there are 525 scan lines in one picture, but after deducting the scan lines used for flyback, the effective scan lines that actually contain image data are 484, respectively. 3, ..., 482, 483 and 484 marks. Moreover, a frame is composed of an odd-numbered field and an even-numbered field, wherein the odd-numbered field includes scan lines marked as 1, 3, 5, ..., 481 and 483 in the frame, and the even-numbered field includes the frames marked as 2, 4, 6, ..., 482 and 484 scan lines. In addition, there are other TV systems such as PAL.

FIG. 2 is a schematic diagram of using a liquid crystal display to play TV signals. In fact, the driving method of the display panel of a general liquid crystal display is to sequentially activate (enable) each scan line of the liquid crystal display panel (scan line), and when a certain scan line is activated, the data line ( data line) to send in the corresponding data, which can be the data contained in a valid scan line of the above-mentioned odd-numbered or even-numbered field. Therefore, the effective scan lines (non-entity) of the odd-numbered image field and the even-numbered image field are called scan-line data (scan-line data), so as to be different from the scan lines (entity) on the liquid crystal display panel.

Please refer to FIG. 2 , where X and Y respectively represent the labels of the data lines and scan lines of the display panel of the liquid crystal display, and T represents the labels of the scan line data of the TV signal. When using a liquid crystal display panel with 240 scan lines to display the above-mentioned picture with 484 scan line data (that is, the odd image field and the even image field respectively have 242 scan line data), the playback mode is to display alternately Odd-numbered and even-numbered fields of each screen. For example, on the liquid crystal display panel, the odd-numbered fields of the first picture are displayed first, and then the even-numbered fields of the first picture are displayed, followed by the odd-numbered fields of the second picture, and then the even-numbered fields of the second picture are displayed alternately. Odd-numbered and even-numbered fields of each screen.

Of course, when displaying odd-numbered image fields (or even-numbered image fields) with 242 scanning-line data on a liquid crystal display panel with 240 scanning lines, it is unavoidable to discard two scanning-line data. Discarding the first and last two or other methods of discarding have little effect on the entire picture. In addition, in order to prevent the liquid crystal from deteriorating or being unable to twist due to continuous application of a unidirectional electric field to the liquid crystal, the liquid crystal must be driven by polarity inversion. For example, FIG. 2 shows the row (column) inversion in the polarity inversion driving method, and there are other modes such as column (row) inversion, frame (frame) inversion, and dot (dot) inversion.

In the prior art, if a liquid crystal display panel with 240 scan lines is used to display a TV signal with 242 scan line data in the odd image field and the even image field, the resolution of the displayed image is only 240 scan lines. Wire. In order to increase the resolution, the general practice is to increase the number of scan lines of the liquid crystal display panel, for example, 480 scan lines, so it is necessary to add memory to store the previous image field (which has 242 scan line data), so as to match the next image field (with 242 scan line data) displayed on the LCD panel (with 480 scan lines), or using memory and some complex algorithms on the LCD panel (with 480 scan lines) Lines) show higher resolution than 480 scan lines.

Contents of the invention

The purpose of the present invention is to provide a driving method of a liquid crystal display panel, which can increase the resolution of the display image without using additional memory and complex algorithms.

The driving method of the liquid crystal display panel of the present invention is used to display pictures on the liquid crystal display panel, wherein the liquid crystal display panel includes M scanning lines and N data lines, and the picture includes a first field (field) and a second field , and both the first field and the second field include L scan line data. The driving method includes sequentially receiving and transmitting L scanning line data of the first field to the liquid crystal display panel to display the first field, and sequentially receiving and transmitting L scanning line data of the second field to the liquid crystal display panel to display the second field.

When the first image field is displayed on the liquid crystal display panel, among the L scan line data of the first image field, there are P scan line data respectively transmitted to two consecutive scan lines on the liquid crystal display panel, and there are Q scan line data The data are respectively transmitted to a single scan line on the liquid crystal display panel, and the sequence of any two scan line data among those scan line data transmitted to the liquid crystal display panel is the same as that of any two scan line data in the first image field. in the same order. At this time, the signal polarities of the odd data lines and the even data lines of the liquid crystal display panel are respectively the first polarity and the second polarity.

When the second image field is displayed on the liquid crystal display panel, among the L scanning line data of the second image field, R scanning line data are respectively transmitted to two consecutive scanning lines on the liquid crystal display panel, and there are S scanning lines The data are respectively sent to a single scan line on the liquid crystal display panel, and the sequence of any two scan line data among those scan line data sent to the liquid crystal display panel is the same as that of any two scan line data above in the second image field. in the same order. At this time, the signal polarities of the odd data lines and the even data lines of the liquid crystal display panel are the second polarity and the first polarity respectively.

Wherein, L, M, N, P, R are all natural numbers, Q, S are all non-negative integers, and P+Q≤L, R+S≤L. In addition, the first polarity and the second polarity represent the voltage level of the data line input signal relative to the common electrode of the upper substrate. In this example, the first polarity and the second polarity are opposite in polarity, for example, the first polarity polarity is a positive value, while the second polarity is a negative value. In this way, when the first image field is displayed, the odd data lines are all positive values (at this time, the even number data lines in the first image field are all negative values), and when the second image field is displayed, the odd number data lines are all positive values. The data lines are all negative (the even-numbered data lines in the second field are all positive), which is row inversion driving in polarity inversion.

It should be noted that, in the previous technical description as shown in FIG. 1 , the scan line data of odd-numbered fields are marked as 1, 3, 5, . . . , and the scan-line data of even-numbered fields are marked as 2, 4, 6, . . However, in order to facilitate the description of the present invention, the scan line data of the odd-numbered field and the even-numbered field are marked as 1, 2, 3, . . . The data of the 2nd and 3rd scanning lines are the data of the 1st, 3rd and 5th scanning lines in Fig. The 2nd, 4th and 6th scanning line data, and so on.

In one embodiment, P+Q=R+S=L, Q, S≠0, so several scan line data in the L scan line data of the first field and the second field are sent to the liquid crystal respectively Two consecutive scan lines on the display panel, and the remaining scan line data are respectively transmitted to a single scan line on the liquid crystal display panel. In another embodiment, P+Q<L, R+S<L, Q, S≠0, so there are several scan line data among the L scan line data in the first field and the second field, respectively. The data is sent to two consecutive scan lines on the liquid crystal display panel, and part of the scan line data in the other remaining scan line data is respectively sent to a single scan line on the liquid crystal display panel. In these two embodiments, when the first image field is displayed, the data of the hth scan line of the first image field is transmitted to the gth scan line of the liquid crystal display panel, and when the second image field is displayed, the data of the second One of the h-1th, hth and h+1th scanning line data of the image field is transmitted to the gth scanning line of the above-mentioned liquid crystal display panel, wherein h and g are natural numbers, and h≤ L, g≤M. Both of the above two embodiments are applicable to the situation that when the scan line data of the first field (or the second field) is driven by line pairs, the number of scan line data is greater than the number of scan lines of the liquid crystal display panel.

To sum up, the driving method of the liquid crystal display panel of the present invention transmits the scanning line data of the picture to the liquid crystal display panel in a line pair manner, and cooperates with the line inversion driving of the liquid crystal display panel to display the picture, without using additional The memory and complex algorithm can increase the resolution of the display screen.

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

Description of drawings

FIG. 1 is a schematic diagram of an interlaced television signal.

FIG. 2 is a schematic diagram of using a liquid crystal display to play interlaced television signals.

3A and 3B are schematic diagrams illustrating a driving method of a liquid crystal display panel according to a preferred embodiment of the present invention.

FIG. 4 is a schematic diagram of a driving method for a liquid crystal display panel according to another preferred embodiment of the present invention.

FIG. 5 is a schematic diagram of a driving method for a liquid crystal display panel according to yet another preferred embodiment of the present invention.

X: Data cable for LCD panel

Y: Scanning line of the LCD panel

Z, T: scan line data of TV signal

+: (polarity is) positive value

-: (polarity is) negative value

Detailed ways

In order to make the description of the implementation of the present invention more clear, the following first image field and second image field are respectively taken as an example of an odd image field and an even image field, and the first polarity and the second polarity are respectively positive and negative values example.

3A and 3B are schematic diagrams of a driving method for a liquid crystal display panel according to a preferred embodiment of the present invention. This method is applicable to the situation that when the scan line data of odd-numbered fields (or even-numbered fields) is driven by line pairs, the number of scan-line data is equal to the number of scan lines of the liquid crystal display panel.

Please refer to Fig. 3A, the "scanning line data of TV signal (T)" on the right and the "scanning line data of TV signal (Z)" in the middle are essentially the same picture, except that the labels of the former scanning line data are as follows 1, and the labeling method of the latter scanning line data adopts the labeling method described in the summary of the invention. Please refer to FIG. 3B , similarly, the “scanning line data of TV signal (T)” on the right and the “scanning line data of TV signal (Z)” in the middle are essentially the same picture. Wherein, the television signal is an interlaced display type, such as a television signal regulated by NTSC or PAL.

In addition, for the convenience of description, Y, Z and T are sometimes directly used to represent the pattern "scanning line of liquid crystal display panel (Y)", the pattern "scanning line data of TV signal (Z)" and the pattern "TV signal" respectively. The scan line data (T) of the signal".

In Fig. 3A and Fig. 3B, the liquid crystal display receives the interlaced display type television signal as shown in Fig. 1, and each picture of the television signal all includes an odd-numbered picture field and an even-numbered picture field, and the odd-numbered picture field and the even-numbered picture field Fields all include L (for example, 242) scanning line data, and only one picture (i.e. Z or T) is drawn as a representative in Fig. 3A. Those who are familiar with this art should know that the driving method of the present invention is aimed at the interlaced display type television signal of each screen. Since the present invention uses a line pair (line pair) mode to drive the liquid crystal display, the display panel of the liquid crystal display must at least include M scanning lines and N data lines, where M<2L, and M=480 and L=242 are taken as an example below .

The so-called "line pair" drive refers to the transmission of each scan line data of odd-numbered or even-numbered fields to two consecutive scan lines on the liquid crystal display panel, and is transmitted to those scan line data on the liquid crystal display panel The sequence of any two scan line data is the same as the above sequence of any two scan line data in the first image field. For example, a frame of the original TV signal includes scan line data {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, ...}, so its odd-numbered fields include scan line data { 1, 3, 5, 7, 9, 11, ...}, its even field includes scan line data {2, 4, 6, 8, 10, 12, ...}, where scan line data {a, b, c} Represents the a, b, and c scan line data that have a sequential relationship. After the scan line data {1, 3, 5, 7, 9, 11, ...} line pair becomes {1, 1, 3, 3, 5, 5, ...}, the scan line data {2, 4, 6 , 8, 10, 12, ...} line pairs become {2, 2, 4, 4, 6, 6, ...}.

However, in order to increase the resolution of the display screen, the scanning lines on both sides must be staggered. For example, as shown in T in FIG. }, while the scan line data of the even field remains unchanged as {2, 2, 4, 4, 6, 6, ...}, so the first scan line data of the odd field does not use a line pair. Or, for example, as shown in T of FIG. 3B , it can be designed that the scan line data of odd-numbered fields remains {1, 1, 3, 3, 5, 5, ...}, while the scan-line data of even-numbered fields becomes {2, 4, 4, 6, 6, 8, ...}.

The driving method of the present invention can be explained in another way using Z in FIG. 3A . When wanting to display a picture of a TV signal (which includes an odd-numbered field and an even-numbered field of Z), the liquid crystal display panel first displays an odd-numbered field of Z on the first picture, and then displays an even-numbered field of Z on the second picture. The first and second frames are actually just frames displayed on the same display panel at different times, so the first and second frames have the same scan line number.

When the odd-numbered field of Z is displayed on the liquid crystal display panel (or the first picture), the first scan line data of the odd-numbered picture field of Z is transmitted to the first scan line of the liquid crystal display panel (or the first picture), The j scan line data of the odd numbered image field of Z is sent to the 2j-2 and 2j-1 scan lines (where j=2, 3, ..., 239, i.e. j is a natural number and 1<j≤L), the data of the 241st scanning line of the odd field of Z is transmitted to the 480th (=M) scanning line of the liquid crystal display panel (or the first frame). When the even-numbered field of Z is displayed on the liquid crystal display panel (or the second picture), the i-th scan line data of the even-numbered field of Z is transmitted to the 2i-1 and 2i-1 lines of the liquid crystal display panel (or the second picture). The 2ith scan line (where i=1, 2, . . . , 240, ie i is a natural number and i<L).

In FIG. 3A and FIG. 3B , the diagram Y on the left only shows the labels of the scanning lines of the liquid crystal display panel, and does not show the labels of the data lines. However, the driving method of the present invention still needs to cooperate with the row inversion driving as shown in FIG. 2 . In order to prevent the liquid crystal torsion characteristics from being deteriorated or unable to be twisted. The driving method of the present invention utilizes line pair driving, and the polarity inversion of the liquid crystal display panel adopts a row inversion mode.

FIG. 4 is a schematic diagram of a driving method for a liquid crystal display panel according to another preferred embodiment of the present invention. This method is applicable to the situation that when the scan line data of odd-numbered fields (or even-numbered fields) is driven by line pairs, the number of scan-line data is greater than the number of scan lines of the liquid crystal display panel. For example, the odd-numbered image field and the even-numbered image field each have L (for example, 286) scan line data, and each has 2L (for example, 572) scan line data after the line pair is driven, but the liquid crystal display panel only has M. (eg 468) scan lines.

Please refer to Fig. 4, the driving method of the present invention is that the data of P scan lines in the L scan line data of the odd-numbered image field and the even-numbered image field are respectively transmitted to the continuous two scan lines on the liquid crystal display panel, while the other The data of the remaining Q scanning lines are respectively transmitted to a single scanning line on the liquid crystal display panel, wherein P+Q=L, and P, Q, and L are all natural numbers. Then the odd numbered image field and the even numbered image field are respectively displayed on the liquid crystal display panel. Note that the number framed by a dotted line in the figure means that the scan line data represented by the number does not use a line pair, and (*1) means that there is one less than the result after using a line pair.

For example, the odd field of Z in Fig. 4 includes scan line data {1, 2, 2, 3, 4, 4, 5, 5, 6, 7, 7, 8, 8, 9, 10, 10, ...}, Represents the scanning line data {2, 4, 5 in the scanning line data {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, ...} included in a frame of the original TV signal , 7, 8, 10, 11, 13, ...} are respectively transmitted to two consecutive scan lines on the LCD panel, while the remaining scan line data {1, 3, 6, 9, 12, ...} are respectively is transmitted to a single scan line on the LCD panel. Similarly, the even field of Z in Fig. 4 includes scan line data {1, 1, 2, 2, 3, 4, 4, 5, 5, 6, 7, 7, 8, 8, 9, ...}, indicating Scanning line data {1, 2, 4, 5, 7, 8, 10, 11, 13, ...} are respectively sent to two consecutive scan lines on the LCD panel, while the remaining scan line data {3, 6, 9, 12, ...} are respectively sent to sent to a single scan line on the LCD panel.

FIG. 5 is a schematic diagram of a method for driving a liquid crystal display panel according to yet another preferred embodiment of the present invention, and the application of this method is the same as that of FIG. 4 . Please refer to FIG. 5 , the driving method of the present invention is that among the L scan line data of the odd-numbered picture field and the even-numbered picture field, all the P scan line data are transmitted to the continuous two scan lines on the liquid crystal display panel, while the other Only a part of the remaining Q scan line data is transmitted to a single scan line on the liquid crystal display panel, wherein P+Q<L, and P, Q, and L are all natural numbers. Then the odd numbered image field and the even numbered image field are respectively displayed on the liquid crystal display panel. Note that the label framed by a dotted line in the figure means that the scan line data represented by the label does not use a line pair, and (*2) indicates that there are two fewer than the result after using a line pair, which is equivalent to not displaying the data of the label. Represents scanline data.

For example, the odd-numbered fields of Z in Fig. 5 include scan line data {1, 2, 2, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 10, 10, ...}, representing the original The scanning line data {2, 4, 5, 6 in the scanning line data {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, ...} included in one picture of the TV signal , 7, 8, 10, 11, ...} are respectively sent to two consecutive scan lines on the LCD panel, the first scan line data is sent to a single scan line on the LCD panel, and the scan line data {3, 9, 15, 21, ...} are not teleported. Similarly, the even field of Z in Fig. 4 includes scan line data {1, 1, 2, 2, 3, 3, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 11, 11...}, representing the scan line data {1 in the scan line data {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, ...} included in a frame of the original TV signal , 2, 3, 5, 6, 7, 8, 9, 11, 12, ...} are respectively transmitted to two consecutive scan lines on the LCD panel, and the scan line data {4, 10, 16, 22, ... } are respectively sent to a single scan line on the liquid crystal display panel.

In the driving methods shown in FIG. 4 and FIG. 5 , which scan line data is transmitted to two consecutive scan lines of the liquid crystal display panel? Which scan line data is sent to a single scan line of the LCD panel? And which scan line data is not transmitted? Regardless of the selection method used, as long as the following conditions are met. That is, as long as the odd-numbered image field is displayed, the h-th scan line data of the odd-numbered image field is transmitted to the g-th scan line of the liquid crystal display panel, and when the even-numbered image field is displayed, the h-1th, One of the h-th and h+1-th scan line data is transmitted to the g-th scan line of the liquid crystal display panel, wherein h and g are natural numbers, and h≤L and g≤M.

It is worth mentioning that, in the driving method of FIG. 4 , data of each scan line is displayed on at least one scan line of the liquid crystal display panel. However, in the driving method of FIG. 5 , some scan line data are not displayed on the liquid crystal display panel, so the resolution of the method in FIG. 5 is lower than that of the method in FIG. 4 .

To sum up, the driving method of the liquid crystal display panel of the present invention transmits the scanning line data of the picture to the liquid crystal display panel in a line pair manner, and cooperates with the line inversion driving of the liquid crystal display panel to display the picture, without using additional The memory and complex algorithm can increase the resolution of the display screen.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, this The scope of protection of the invention shall be defined by the scope of the appended patent application.

Claims (6)

1. the driving method of a display panels, in order on this display panels, to show a picture that comprises one first Tu Chang and one second figure field, and this first figure field and this second figure field all comprise L bar scan-line data, wherein this display panels comprises M bar sweep trace and N bar data line, it is characterized in that the driving method of wherein said display panels comprises:

Those L bar scan-line datas that receive and transmit this first figure field in regular turn to this display panels to show this first figure field, wherein there is P bar scan-line data to be sent to respectively in continuous two sweep traces on this display panels in those L bar scan-line datas of this first figure field, and there is Q bar scan-line data to be sent to respectively in single the sweep trace on this display panels, and the sequencing that is sent to wantonly two scan-line datas in those scan-line datas on this display panels is identical with the sequencing of those wantonly two scan-line datas in this first figure field, and wherein the signal polarity of the odd number bar data line of this display panels and even number bar data line is respectively one first polarity and one second polarity; And

Those L bar scan-line datas that receive and transmit this second figure field in regular turn to this display panels to show this second figure field, wherein there is R bar scan-line data to be sent to respectively in continuous two sweep traces on this display panels in those L bar scan-line datas of this second figure field, and there is S bar scan-line data to be sent to respectively in single the sweep trace on this display panels, and the sequencing that is sent to wantonly two scan-line datas in those scan-line datas on this display panels is identical with the sequencing of those wantonly two scan-line datas in this second figure field, and wherein the signal polarity of the odd number bar data line of this display panels and even number bar data line is respectively this second polarity and this first polarity;

Wherein, this first polarity is opposite with the polarity of this second polarity, and L, M, N, P, R are all natural number, and Q, S are all nonnegative integer, and P+Q≤L, R+S≤L.

2. according to the driving method of the described display panels of claim 1, it is characterized in that wherein working as P+Q=L, during R+S=L, P=M-L, Q=2L-M.

3. according to the driving method of the described display panels of claim 1, it is characterized in that wherein working as P+Q=L, during R+S=L, Q, S ≠ 0, and this h bar scan-line data of this first figure field is sent to this g bar sweep trace of this display panels, and one of them is sent to this g bar sweep trace of this display panels this h-1 bar, this h bar and this h+1 bar scan-line data three of this second figure field

Wherein, h, g are all natural number, and h≤L, g≤M.

4. according to the driving method of the described display panels of claim 1, it is characterized in that wherein said first polarity on the occasion of, and this second polarity is negative value.

5. according to the driving method of the described display panels of claim 1, it is characterized in that wherein said first polarity is negative value, and this second polarity be on the occasion of.

6. according to the driving method of the described display panels of claim 1, it is characterized in that wherein as P+Q＜L, during R+S＜L, Q, S ≠ 0, and this h bar scan-line data of this first figure field is sent to this g bar sweep trace of this display panels, and one of them is sent to this g bar sweep trace of this display panels this h-1 bar, this h bar and this h+1 bar scan-line data three of this second figure field

Wherein, h, g are all natural number, and h≤L, g≤M.

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