LCD panel, LCD including same, and driving method thereof

• US 7,355,576 B2
• Filed: 11/29/2001
• Issued: 04/08/2008
• Est. Priority Date: 12/07/2000
• Status: Expired due to Fees

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Song, Jang-Kun
• Primary Examiner(s): Hjerpe; Richard
• Assistant Examiner(s): Shapiro; Leonid
• Application Number:
  US09/995,766
• Publication Number:
  US 20020097214A1
• Time in Patent Office: 2,322 Days
• Field of Search: 345/87, 345/88, 345/92, 345 95- 96, 345/55, 345/50, 345/98, 345/100
• US Class Current: 345/87
• CPC Class Codes: G09G 2320/0223 Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
• CPC Class Codes: G09G 2320/0252 Improving the response speed
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3655 Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
• CPC Class Codes: G09G 3/3659 the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes

Abstract

Disclosed is an LCD panel, an LCD including the LCD panel, and a driving method for high-speed responses. The present invention comprises a plurality of gate lines; a plurality of data lines; a common electrode line formed in the horizontal direction with vertical branches, and formed at a predetermined area between a gate line and its adjacent gate line; a first pixel electrode formed at an odd row of an odd column and even row of an even column among an area formed by a the data line and a gate line; and a second pixel electrode formed at an odd row of an even column and an even row of an odd column of the area, and having a polarity different from the first pixel electrode.

Claims

1. A method for driving a liquid crystal display including a top substrate common electrode a plurality of gate lines, a plurality of data lines, a plurality of common electrode lines arranged alternately between the plurality of gate lines, a plurality of pixels connected to the plurality of gate lines and the plurality of data lines and arranged in a matrix, said method comprising:

applying a first data voltage of a first polarity to the plurality of data lines;

providing a first scanning signal for odd pixels in an odd row and even pixels in an even row;

applying a second data voltage of a second polarity opposite to the first polarity to the plurality of data lines;

providing a second scanning signal for odd pixels in an even row and even pixels in an odd row;

supplying the common electrode lines with a swinging common electrode voltage; and

supplying an overshoot voltage to a voltage applied to each pixel in response to the first data voltage and the second data voltage upon a variation of a level of the swinging common electrode voltage, wherein a level of the voltage applied to each pixel is varied in response to the overshoot voltage.

2. The method for driving the liquid crystal display of claim 1, wherein the swinging common electrode voltage has a square waveform having a same period as the first scanning signal and the second scanning signal.

3. The method for driving the liquid crystal display of claim 1, wherein the swinging common electrode voltage has a square waveform having a three times longer period than the first scanning signal and the second scanning signal.

4. The method for driving the liquid crystal display of claim 1, wherein the overshoot voltage is determined as:

$V_{\mathrm{overshot}}=\frac{\mathrm{\Delta <br><br>}<br><br><br><br>V_{\mathrm{com}}·<br><br>C_{\mathrm{st}}<br><br>\left(C_{\mathrm{lc2}}-C_{\mathrm{lc1}}\right)}{2<br><br>\left(C_{\mathrm{st}}+C_{\mathrm{lc1}}\right)·<br><br>\left(C_{\mathrm{st}}+C_{\mathrm{lc2}}\right)}$

where V_com represents the swinging common electrode voltage, C_lc1 and C_lc2 capacitances of a liquid crystal capacitor at the first grey state and the second grey state, respectively, C_st represents a storage capacitance.

5. A method for driving a liquid crystal display including a plurality of gate lines, a plurality of data lines, a plurality of common electrode lines arranged alternately between the plurality of gate lines, a plurality of pixels connected to the plurality of gate lines and the plurality of data lines and arranged in a matrix, said method comprising:

applying a first data voltage of a first polarity to the plurality of data lines;

providing a first scanning signal for odd pixels in an odd row and even pixels in an even row;

applying a second data voltage of a second polarity opposite to the first polarity to the plurality of data lines;

providing a second scanning signal for odd pixels in an even row and even pixels in an odd row; and

supplying the common electrode lines with a swinging common electrode voltage;

wherein a swing amplitude of the swinging common electrode voltage is established as;

$\mathrm{\Delta <br><br>}<br><br><br><br>V_{\mathrm{com}}=\frac{2<br><br>\left(V_{\max }+V_{\mathrm{th}}\right)<br><br>\left(C_{\mathrm{st}}+C_{\mathrm{Ic}-\mathrm{black}}\right)<br><br>\left(C_{\mathrm{st}}+C_{\mathrm{Ic}-\mathrm{white}}\right)}{C_{\mathrm{st}}<br><br>\left(2<br><br>C_{\mathrm{st}}+C_{\mathrm{Ic}-\mathrm{white}}+C_{\mathrm{Ic}-\mathrm{black}}\right)}$

where V_max represents the maximum value of the actual voltage sensed by a liquid crystal, V_th represents the minimum value of the actual voltage sensed by the liquid crystal, C_lc represents a liquid crystal capacitance. C_st, represents a storage capacitance, C_lc-white represents the liquid crystal capacitance in a black mode, and C_lc-white represents the liquid crystal capacitance in a white mode.

6. A method for driving a liquid crystal display including a top substrate common electrode, a plurality of gate lines, a plurality of data lines, a plurality of common electrode lines arranged alternately between the plurality of gate lines, a plurality of first pixels and a plurality of second pixels connected to the plurality of gate lines and the plurality of data lines and arranged alternately in rows and columns, said method comprising:

applying a first data voltage of a first polarity to the plurality of data lines;

providing a first scanning signal for odd pixels in an odd row and even pixels in an even row;

applying a second data voltage of a second polarity opposite to the first polarity to the plurality of data lines;

providing a second scanning signal for odd pixels in an even row and even pixels in an odd row;

supplying the common electrode lines with a swinging common electrode voltage; and

supplying an overshoot voltage to a voltage applied to each pixel in response to the first data voltage and the second data voltage upon a variation of a level of the swinging common electrode voltage, wherein a level of the voltage applied to each pixel is varied in response to the overshoot voltage.

7. The method of claim 6, wherein the swinging common electrode voltage has a square waveform having a same period as the first scanning signal and the second scanning signal.

8. The method of claim 6, wherein the swinging common electrode voltage has a square waveform having a period three times longer than the first scanning signal and the second scanning signal.

9. The method for driving the liquid crystal display of claim 6, wherein the overshoot voltage is determined as:

$V_{\mathrm{overshot}}=\frac{\mathrm{\Delta <br><br>}<br><br><br><br>V_{\mathrm{com}}·<br><br>C_{\mathrm{st}}<br><br>\left(C_{\mathrm{lc2}}-C_{\mathrm{lc1}}\right)}{2<br><br>\left(C_{\mathrm{st}}+C_{\mathrm{lc1}}\right)·<br><br>\left(C_{\mathrm{st}}+C_{\mathrm{lc2}}\right)}$

where V_com represents the swinging common electrode voltage, C_lc1 and C_lc2 capacitances of a liquid crystal capacitor at the first grey state and the second grey state, respectively, C_st represents a storage capacitance.

10. A method for driving a liquid crystal display including a plurality of gate lines, a plurality of data lines, a plurality of common electrode lines arranged alternately between the plurality of gate lines, a plurality of first pixels and a plurality of second pixels connected to the plurality of gate lines and the plurality of data lines and arranged alternately in rows and columns, said method comprising:

applying a first data voltage of a first polarity to the plurality of data lines;

providing a first scanning signal to the plurality of first pixels in pairs of neighboring rows;

applying a second data voltage of a second polarity opposite to the first polarity to the plurality of data lines;

providing a second scanning signal to the plurality of second pixels in pairs of neighboring rows; and

supplying the common electrode lines with a swinging common electrode voltage;

a swing amplitude of the swinging common electrode voltage is established as;

$\mathrm{\Delta <br><br>}<br><br><br><br>V_{\mathrm{com}}=\frac{2<br><br>\left(V_{\max }+V_{\mathrm{th}}\right)<br><br>\left(C_{\mathrm{st}}+C_{\mathrm{Ic}-\mathrm{black}}\right)<br><br>\left(C_{\mathrm{st}}+C_{\mathrm{Ic}-\mathrm{white}}\right)}{C_{\mathrm{st}}<br><br>\left(2<br><br>C_{\mathrm{st}}+C_{\mathrm{Ic}-\mathrm{white}}+C_{\mathrm{Ic}-\mathrm{black}}\right)}$

where V_max represents the maximum value of the actual voltage sensed by a liquid crystal, V_th represents the minimum value of the actual voltage sensed by the liquid crystal, C_lc represents a liquid crystal capacitance, C_st represents a storage capacitance, C_lc-block represents the liquid crystal capacitance in a black mode, and C_lc-block represents the liquid crystal capacitance in a white mode.