CN101303835A - Method for driving a liquid crystal display panel - Google Patents

Abstract

A method for driving a liquid crystal display panel, the liquid crystal display panel includes a plurality of pixels corresponding to a matrix, the method includes receiving image data; setting the pixel polarity of the plurality of pixels according to a liquid crystal display panel driving method; dividing the plurality of pixels into a plurality of groups in columns according to the pixel polarity corresponding to a row of the matrix; and sequentially scanning the pixels corresponding to the plurality of groups to display the image data.

Description

Method for driving a liquid crystal display panel

technical field

The invention relates to a method for driving a liquid crystal display panel, in particular to a method for greatly reducing the number of polarity inversions of pixels in the same row in the same frame.

Background technique

Liquid crystal displays have the characteristics of light and thin appearance, low power consumption, and no radiation pollution, and have been widely used in information products such as computer systems, mobile phones, and personal digital assistants (PDAs). The working principle of the liquid crystal display is to use the liquid crystal molecules in different alignment states to have different polarization or refraction effects on light, so the penetration of light can be controlled through liquid crystal molecules in different alignment states, and output light of different intensities can be further generated. And red, green, blue light with different grayscale intensities.

Please refer to FIG. 1 , which is a schematic diagram of a conventional thin film transistor (Thin Film Transistor, TFT) liquid crystal display 10 . The liquid crystal display 10 includes a liquid crystal display panel (LCD Panel) 100 , a control circuit 102 , a data line signal output circuit 104 , a scan line signal output circuit 106 and a voltage generator 108 . The liquid crystal display panel 100 is composed of two substrates (Substrate), and a liquid crystal material (LCD layer) is filled between the two substrates. A plurality of data lines (DataLine) 110, a plurality of scan lines (Scan Line, or gate line, GateLine) 112 and a plurality of thin film transistors 114 perpendicular to the data lines 110 are arranged on one substrate, while on another substrate A common electrode is provided for providing a common voltage (Vcom) via the voltage generator 108 . For ease of description, only four thin film transistors 114 are shown in FIG. Distributed on the liquid crystal display panel 100 in a matrix, each data line 110 corresponds to a row (Column) of the thin film transistor liquid crystal display 10, and the scanning line 112 corresponds to a column (Row) of the thin film transistor liquid crystal display 10, and each The thin film transistor 114 corresponds to a pixel (Pixel). In addition, the characteristics of the circuit formed by the two substrates of the liquid crystal display panel 100 can be regarded as an equivalent capacitance 116 .

The driving principle of the existing thin film transistor liquid crystal display 10 is described in detail as follows. When the control circuit 102 receives the horizontal synchronization signal (Horizontal Synchronization) 118 and the vertical synchronization signal (Vertical Synchronization) 120, the control circuit 102 will generate corresponding control signals respectively Input to the data line signal output circuit 104 and the scan line signal output circuit 106, and then the data line signal output circuit 104 and the scan line signal output circuit 106 will generate input signals to different data lines 110 and scan lines 112 according to the control signal, Therefore, the conduction of the thin film transistor 114 and the potential difference between the two ends of the equivalent capacitor 116 are controlled, and the arrangement of the liquid crystal molecules and the corresponding light penetration amount are further changed to display the display data 122 on the liquid crystal display panel 100 . For example, the scan line signal output circuit 106 inputs a pulse wave to the scan line 112 to turn on the thin film transistor 114, so the signal input to the data line 110 by the data line signal output circuit 104 can be input to the equivalent capacitor 116 through the thin film transistor 114 , so to control the gray level (Gray Level) state of the corresponding pixel. In addition, by controlling the magnitude of the signal input from the data line signal output circuit 104 to the data line 110 , different gray scales can be generated.

If the liquid crystal molecules are continuously driven with a positive voltage, the polarization or refraction effect of the liquid crystal molecules on light will be reduced, thus deteriorating the quality of the screen display. Polarization or refraction effects. Therefore, in order to protect the liquid crystal molecules from being damaged by the driving voltage, the liquid crystal molecules must be driven by alternating positive and negative voltages. In addition, in addition to an equivalent capacitor 116, the liquid crystal display panel 100 also generates parasitic capacitance (Parasite Capacitor) during circuit operation, so when the same image is displayed on the liquid crystal display panel 100 for a long time, the parasitic capacitance will be stored The Residual Image Effect caused by the charge will affect the display of the subsequent screen, so it is also necessary to use positive and negative voltages to drive the liquid crystal molecules in order to improve the influence of parasitic capacitance on the image output. Please refer to FIG. 2 to FIG. 5. FIG. 2 and FIG. 3 are schematic diagrams of the existing line inversion (Line Inversion), and FIG. 4 and FIG. 5 are schematic diagrams of the existing single-point inversion (Dot Inversion). In Figure 2 and Figure 3, block 200 and block 300 are schematic diagrams of the pixel polarity of the same part of two consecutive frames (Frame); comparing block 200 and block 300, it can be known that the liquid crystal display is driven by column reverse driving When using the panel 100, the polarity of the pixels in the same column will change with the screen switching. In addition, in FIG. 4 and FIG. 5 , block 400 and block 500 are schematic diagrams of the pixel polarity of the same part of two consecutive frames (Frame); comparing block 400 and block 500, it can be seen that in the single-point reverse driving method When the liquid crystal display panel 100 is driven, the polarities of adjacent pixels are different, and the polarity of the same pixel will change as the screen is switched.

When the liquid crystal display panel is driven by column reverse driving, the polarities of the pixels in two adjacent columns are different, and the polarity of the pixels in the same column will change as the screen is switched, so the phenomenon of flickering in the vertical direction of the screen can be improved. When the liquid crystal display panel is driven by a single-point reverse driving method, the polarities of the pixels at two adjacent points are different, and the polarity of the pixels at the same point will change as the screen is switched. Therefore, the vertical direction and horizontal direction of the screen can be improved at the same time. The phenomenon of direction flickering. However, in the same row of these two driving methods, the flip times of the pixel polarity is half of the number of columns, resulting in energy consumption, please refer to the following description.

Taking Fig. 4 and Fig. 5 as an example, when an existing liquid crystal display device displays a picture, it displays all the pixels of the column L1 from left to right, and then displays all the pixels of the column L2 from left to right, and so on; finally, after displaying After all the pixels in the column L8 are returned to the column L1 to display the next picture, the relevant driving signals are shown in FIG. 6 , where the high-level square wave is used to activate the pixels in the corresponding column to display data. In this case, only the pixels in the same row (such as row CH1 ) can be seen. After scanning a frame, the polarity of the pixels in the same row needs to be reversed by half of the number of columns (for this example, 4 times). Since the inversion of the pixel polarity is to switch the level of the shared pole voltage through the shared pole voltage generator (such as the voltage generator 108 in Figure 1), and cooperate with the scan line signal level (output by the scan line signal output circuit 106) The switching of the pixel can achieve the purpose of flipping the polarity of the pixel. Therefore, the power consumption of the existing column inversion or single-point inversion driving method is quite large, thus limiting its development, especially as the size of the liquid crystal display panel becomes larger, the number of polarity inversions of pixels in the same row will become more and more Many (for example, if there are 256 columns of liquid crystal display panels, the number of polarity reversals of pixels in the same row is 128 times), resulting in increased power consumption and affecting its use range.

Contents of the invention

Therefore, the main purpose of the present invention is to provide a method for driving a liquid crystal display device.

The invention discloses a method for driving a liquid crystal display panel, the liquid crystal display panel includes a plurality of pixels corresponding to a matrix, the method includes receiving an image data; according to a liquid crystal display panel driving method, setting the pixels of the plurality of pixels pixel polarity; according to the pixel polarity corresponding to one row of the matrix, the plurality of pixels are divided into a plurality of groups in columns; and the pixels corresponding to the plurality of groups are sequentially scanned to display the image data.

Description of drawings

FIG. 1 is a schematic diagram of a conventional thin film transistor liquid crystal display.

FIG. 2 and FIG. 3 are schematic diagrams of conventional row reverse driving methods.

4 and 5 are schematic diagrams of the conventional single-point reverse driving method.

FIG. 6 is a schematic diagram of driving signals corresponding to FIG. 4 and FIG. 5 .

FIG. 7 is a flow chart of driving a liquid crystal display panel according to an embodiment of the present invention.

FIG. 8 is a schematic diagram of driving signals for driving the blocks in FIG. 4 according to an embodiment of the present invention.

FIG. 9 and FIG. 10 are schematic diagrams of a double-row single-point reverse driving method.

FIG. 11 is a schematic diagram of driving signals for driving the blocks in FIG. 9 according to an embodiment of the present invention.

Description of reference symbols

10 Thin Film Transistor Liquid Crystal Display

100 LCD display panel

102 Control circuit

104 Data line signal output circuit

106 Scan line signal output circuit

108 Voltage generator

110 data line

112 scan lines

114 Thin Film Transistor

116 Equivalent capacitance

118 Horizontal synchronization signal

120 Vertical sync signal

122 Display data

70 Process

700, 702, 704, 706, 708, 710 steps

200, 300, 400, 500, 900, 1000 blocks

L1, L2, L 3, L4, L5, L6, L7, L8 columns

CH1, CH2, CH 3, CH4, CH5, CH6, CH7, CH8 row

Detailed ways

Please refer to FIG. 7 , which is a schematic diagram of a process 70 for driving a liquid crystal display panel according to an embodiment of the present invention. The liquid crystal display panel includes a plurality of pixels corresponding to a matrix. Process 70 comprises the following steps:

Step 700: start.

Step 702: Receive an image data.

Step 704: Set the pixel polarities of the plurality of pixels according to a driving mode of the liquid crystal display panel.

Step 706: Divide the plurality of pixels into a plurality of groups in units of columns according to the pixel polarity corresponding to a row of the matrix.

Step 708: Scan the pixels corresponding to the plurality of groups in order to display the image data.

Step 710: end.

According to the process 70, the present invention sets the pixel polarity of the liquid crystal display panel according to a specific driving mode of the liquid crystal display panel (such as a single point reverse driving mode, a column reverse driving mode, etc.), and sets the pixel polarity of a certain row of pixels according to the polarity of The pixels of the liquid crystal display panel are divided into a plurality of groups in units of columns, and the pixels of each group are sequentially scanned to display image data. Preferably, in the present invention, the pixels in the column corresponding to the pixels with the same polarity in the row are set as the same group. Therefore, through the process 70 of the present invention, the number of polarity inversions of the same row of pixels in the same frame can be greatly reduced, and only one inversion is even required. In this case, the power consumption of the LCD panel can be greatly reduced.

For example, taking FIG. 4 as an example, the pixel polarity of the row CH1 of the block 400 is positive and negative alternately. Therefore, according to the process 70, the columns L1, L3, L5, and L7 can be set as the first group, and the columns L2, L4, L6, and L8 are set as the second group, and the corresponding pixels are scanned in this order, and the relevant driving signals are shown in FIG. It can be seen from FIG. 8 that the columns (L1, L3, L5, L7) corresponding to the positive polarity pixels in the row CH1 of the block 400 will be scanned in sequence, and then the columns (L2, L4) corresponding to the negative polarity pixels in the row CH1 will be scanned. , L6, L8). In this way, the number of polarity inversions of pixels in the same row in the same frame is reduced to 1. Compared with the prior art, the present invention can significantly reduce the number of polarity inversions, thereby reducing power consumption.

Therefore, through the process 70, the number of polarity inversions of pixels in the same row in the same frame can be greatly reduced, especially for large-sized liquid crystal display panels, the power consumption can be greatly reduced, and thus the application range can be expanded. It should be noted that the above-mentioned embodiments are only used to illustrate the operation mode of the present invention, rather than to limit the scope of the present invention, those skilled in the art can make other changes accordingly, for example, the same line The pixels in the columns corresponding to the pixels with the same polarity are set as a plurality of subgroups, and then the pixels in each subgroup are scanned in sequence. In addition, in the present invention, the driving method of the liquid crystal display panel is not limited to a specific driving method. For example, FIG. 9 and FIG. 10 are schematic diagrams of a dual-row single-point reverse driving method. Wherein, block 900 and block 1000 are schematic diagrams of pixel polarity of the same part of two consecutive frames, then according to the process 70, when driving block 900 in FIG. 9 , columns L1, L2, L5, and L6 can be set to Group, and set columns L3, L4, L7, L8 to another group, and scan columns L1, L2, L5, L6, L3, L4, L7, L8 in sequence, and the related driving signals are shown in Figure 11.

To sum up, in the present invention, the pixels of the liquid crystal display panel are used as the unit of column, and the pixels in the column corresponding to the pixels with the same polarity in a certain row are set as the same group, and then the pixels in each group are scanned sequentially. , to display the image data. Therefore, the present invention can greatly reduce the number of polarity inversions of pixels in the same row in the same frame, and even only needs one inversion, thereby reducing power consumption.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

Claims (7)

1. method that drives a display panels, this display panels comprises a plurality of pixels corresponding to a matrix, and this method includes:

Receive a view data;

According to a display panels type of drive, set the pixel polarity of these a plurality of pixels;

Pixel polarity according to corresponding to the delegation of this matrix should a plurality of pixels be divided into a plurality of groups with the unit of classifying as; And

Scan this pairing pixel of a plurality of groups in regular turn, to show this view data.

2. the method for claim 1, wherein this display panels type of drive is a single-point reverse drive mode.

3. the method for claim 1, wherein this display panels type of drive is a row reverse drive mode.

4. the method for claim 1, wherein this display panels type of drive is an a pair of reverse drive mode of itemizing.

5. the method for claim 1, wherein, should a plurality of pixels be divided into this a plurality of groups according to pixel polarity with the unit of classifying as corresponding to this row of this matrix, be the pixel polarity of basis corresponding to this row of this matrix, with pixel polarity in this row is that the pixel of the pairing row of pixel of one first polarity is set at one first group, and is that the pixel of the pairing row of pixel of one second polarity is set at one second group with pixel polarity in this row.

6. method as claimed in claim 5, it comprises in addition this pairing pixel of first group is divided into a plurality of first subgroup, and this pairing pixel of second group is divided into a plurality of second subgroup.

7. method as claimed in claim 6, wherein, this pairing pixel of a plurality of groups of scanning is to scan these a plurality of first subgroup and the pairing pixel of these a plurality of second subgroup in regular turn, to show this view data to show this view data in regular turn.

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