LIQUID CRYSTAL DISPLAY, LIQUID CRYSTAL DISPLAY DRIVING METHOD, AND TELEVISION RECEIVER

• US 20100253668A1
• Filed: 11/11/2008
• Published: 10/07/2010
• Est. Priority Date: 12/27/2007
• Status: Abandoned Application

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Sugihara, Toshinori, Ban, Atsushi, Tsubata, Toshihide
• Application Number:
  US12/735,033
• Publication Number:
  US 20100253668A1
• Time in Patent Office: Days
• US Class Current: 345/211
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 2203/30 Gray scale
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0447 for multi-domain technique to improve the viewing angle in a liquid crystal display, such as multi-vertical alignment [MVA]
• CPC Class Codes: G09G 2310/021 Double addressing, i.e. scanning two or more lines, e.g. lines 2 and 3; 4 and 5, at a time in a first field, followed by scanning two or more lines in another combination, e.g. lines 1 and 2; 3 and 4, in a second field
• CPC Class Codes: G09G 2310/0289 Details of voltage level shifters arranged for use in a driving circuit
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 2320/028 by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction
• CPC Class Codes: G09G 3/2096 Details of the interface to the display terminal specific for a flat panel suitable for both CRT and flat panel G09G5/006; specific for a CRT G09G1/167
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127
• 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 3/3666 with the matrix divided into sections
• CPC Class Codes: G09G 3/3677 suitable for active matrices only
• CPC Class Codes: G09G 3/3688 suitable for active matrices only

Abstract

First and second data signal lines are provided for a column of pixels, and signal potentials of opposite polarity to each other are supplied to the data signal lines respectively. In at least one embodiment, a predetermined pixel is taken as the first pixel. A pixel other than the (2×n×i+1)-th pixel in the scanning direction is connected to a data signal line different from that connected to the previous pixel, whereas the (2×n×i+1)-th pixel is connected to the same data signal line as that connected to the previous pixel. The polarity of the signal potential supplied to each data signal line is inverted every n horizontal scanning periods. Every adjacent two scan signal lines starting from the scan signal line connected to the predetermined pixel are sequentially selected at the same time among scan signal lines. A liquid crystal display with this structure enables an increase of the pixel charging time as well as prevention of flickering.

Claims

1. A liquid crystal display, having pixels aligned in a row direction and a column direction, the row direction being a direction in which scanning signal lines are extended,

the liquid crystal display comprising pixel columns, first data signal lines, and second data signal lines,

a first data signal line and a second data signal line being provided for each pixel column, one pixel included in the pixel column being connected with a scanning signal line and one of the first data signal line and the second data signal line, and signal potentials with opposite polarities being supplied to the first data signal line and the second data signal line, respectively,

in a case where a predetermined pixel in the pixel column is regarded as a first pixel from which counting of a pixel starts, an odd-number-positioned pixel and an even-number-positioned pixel in a scanning direction are paired, n (n is a natural number) pairs are regarded as a group, and each group is given a count number,

each group being configured such that two pixels in each pair are connected with different data signal lines and each odd-number-positioned pixel is connected with one data signal line, and

in two groups with successive count numbers, an odd-number-positioned pixel in one group and an odd-number-positioned pixel in the other group being connected with different data signal lines.

2. The liquid crystal display as set forth in claim 1, wherein a polarity of a signal potential supplied to a data signal line is inverted with respect to n horizontal scanning period.

3. The liquid crystal display as set forth in claim 1, wherein a group is selected according to the count number, in the selected group, scanning signal lines respectively connected with two pixels in a pair are simultaneously selected, and when n is 2 or more, the simultaneous selection is sequentially performed with respect to each pair.

7. The liquid crystal display as set forth in claim 1, wherein pixels in one pixel row are connected with one scanning signal line, a first data signal line for one of adjacent two pixel columns and a first data signal line for the other of the adjacent two pixel columns are supplied with a signal potential with a same potential, and connections with a first data signal line and a second data signal line are made oppositely between pixels adjacent in a row direction.

8. The liquid crystal display as set forth in claim 7, wherein a first data signal line and a second data signal line for a pixel column are provided at both sides of the pixel column, and a first data signal line for one of adjacent two pixel columns and a second data signal line for the other of the adjacent two pixel columns are adjacent to each other without a pixel column therebetween or a second data signal line for one of adjacent two pixel columns and a first data signal line for the other of the adjacent two pixel columns are adjacent to each other without a pixel column therebetween.

9. The liquid crystal display as set forth in claim 7, wherein a first data signal line and a second data signal line for a pixel column are provided at both sides of the pixel column, and a first data signal line for one of adjacent two pixel columns and a first data signal line for the other of the adjacent two pixel columns are adjacent to each other without a pixel column therebetween or a second data signal line for one of adjacent two pixel columns and a second data signal line for the other of the adjacent two pixel columns are adjacent to each other without a pixel column therebetween.

10. The liquid crystal display as set forth in claim 1, wherein the odd-number-positioned pixel and the even-number-positioned pixel in a pair are adjacent to each other.

11. The liquid crystal display as set forth in claim 10, wherein each pixel other than 2×

n×

i+1^st (i is a natural number) pixel and its upstream-adjacent pixel are connected with different data signal lines and the 2×

n×

i+1^st pixel and its upstream-adjacent pixel are connected with a same data signal line, and

the scanning signal lines are sequentially selected with starting from a scanning signal line connected with the predetermined pixel in such a manner that adjacent two scanning signal lines are selected simultaneously.

12. The liquid crystal display as set forth in claim 1, wherein n=1.

19. The liquid crystal display as set forth in claim 1, wherein

there are provided a plurality of retention capacitance lines whose potentials are controllable,

the pixel includes a first transistor, second transistor, a first pixel electrode, and a second pixel electrode,

the first pixel electrode and the second pixel electrode are connected with a same data signal line via the first transistor and the second transistor, respectively,

the first transistor and the second transistor are connected with the scanning signal line,

the first pixel electrode and the second pixel electrode form retention capacitances with different retention capacitance lines, respectively,

potentials of the different retention capacitance lines with which the first pixel electrode and the second pixel electrode form retention capacitances are caused to shift their levels in an opposite direction to each other in synchronization with or after completion of scanning of the scanning signal line with which the first transistor and the second transistor are connected.

20. The liquid crystal display as set forth in claim 19, wherein

a retention capacitance line is provided for two pixels adjacent in a column direction, and

a first pixel electrode or a second pixel electrode provided in one of the two pixels and a first pixel electrode or a second pixel electrode provided in the other of the two pixels form retention capacitances with the retention capacitance line.

21. The liquid crystal display as set forth in claim 1, wherein during each horizontal scanning period, the first data signal line and the second data signal line are supplied with a preliminary potential and thereafter with the signal potential.

22. The liquid crystal display as set forth in claim 21, wherein the preliminary potential has a constant value.

23. The liquid crystal display as set forth in claim 22, wherein the constant value is a middle value of a range of the signal potential.

24. The liquid crystal display as set forth in claim 20, wherein the preliminary potential is determined based on a signal potential supplied to a data signal line during a previous horizontal scanning period and a signal potential to be supplied to the data signal line during a current horizontal scanning period.

25. The liquid crystal display as set forth in claim 21, wherein an intermediate selection period is provided between scanning periods for a scanning signal line in accordance with timing of supplying the preliminary potential, and the preliminary potential is written in a pixel connected with the scanning signal line during the intermediate selection period.

26. The liquid crystal display as set forth in claim 1, wherein one of the first data signal line and the second data signal line is provided at one side of the pixel column and the other of the first data signal line and the second data signal line is provided in such a manner as to overlap the pixel column.

27. The liquid crystal display as set forth in claim 3, wherein the simultaneously selected scanning signal lines are connected in a liquid crystal panel or connected with a same output of a gate driver for driving the scanning signal lines.

28. The liquid crystal display as set forth in claim 1, wherein a display section includes a plurality of domains, and each of the plurality of domains includes data signal lines, scanning signal lines, and pixels, and the data signal lines, scanning signal lines, and the pixels included in each domain are driven with respect to said each domain.

29. The liquid crystal display as set forth in claim 1, wherein the number of frames displayed per one second is more than 60.

30. The liquid crystal display as set forth in claim 11, wherein

there are provided a plurality of retention capacitance lines whose potentials are controllable, each pixel includes a first transistor, a second transistor, a first pixel electrode, and a second pixel electrode, the first pixel electrode and the second pixel electrode are connected with a same data signal line via the first transistor and the second transistor, respectively, the first transistor and the second transistor are connected with a same scanning signal line, the first pixel electrode and the second pixel electrode form retention capacitances with different retention capacitance lines, respectively,

a retention capacitance line is provided for adjacent two pixels in the pixel column, one of a first pixel electrode and a second pixel electrode of one of the adjacent two pixels and one of a first pixel electrode and a second pixel electrode of the other of the adjacent two pixels form retention capacitances with the retention capacitance line provided for the two pixels,

retention capacitance lines that form retention capacitances with a first pixel electrode and a second pixel electrode in a first-positioned pixel positioned first among all the pixels are first-positioned and second-positioned retention capacitance lines, the second-positioned retention capacitance line also forms retention capacitance with one of a first pixel electrode and a second pixel electrode of a second-positioned pixel positioned second among all the pixels, and at a time of completion of writing of the first-positioned and second-positioned pixels or after the completion, potentials of the first-positioned and second-positioned retention capacitance lines shift simultaneously and in an opposite direction,

between two successive odd-number-positioned retention capacitance lines counted in a scanning direction from the first-positioned retention capacitance line, shift of a potential of a former of the two successive odd-number-positioned retention capacitance lines is followed after 1 horizontal scanning period by shift of potential of a latter of the two successive odd-number-positioned retention capacitance lines in a same direction, and between two successive even-number-positioned retention capacitance lines, shift of a potential of a former of the two successive even-number-positioned retention capacitance lines is followed after 1 horizontal scanning period by shift of a potential of a latter of the two successive even-number-positioned retention capacitance lines in a same direction.

35. A television receiver, comprising

a liquid crystal display as set forth in claim 1, and

a tuner section for receiving television broadcasting.

4. A liquid crystal display, having pixels aligned in a row direction and a column direction, the row direction being a direction in which scanning signal lines are extended,

the liquid crystal display comprising pixel columns, first data signal lines, and second data signal lines,

a first data signal line and a second data signal line being provided for each pixel column, one pixel included in the pixel column being connected with a scanning signal line and one of the first data signal line and the second data signal line, and signal potentials with opposite polarities being supplied to the first data signal line and the second data signal line, respectively,

in a case where a predetermined pixel in the pixel column is regarded as a first pixel from which counting of a pixel starts, an odd-number-positioned pixel and an even-number-positioned pixel counted in a scanning direction are paired, and each pair is given a count number,

two pixels in each pair being connected with different data signal lines, and

an odd-number-positioned pixel in one of two pairs with successive count numbers and an odd-number-positioned pixel in the other of the two pairs with successive count numbers being connected with a same data signal line.

5. The liquid crystal display as set forth in claim 4, wherein a polarity of a signal potential supplied to each data signal line is inverted with respect to each vertical scanning period.

6. The liquid crystal display as set forth in claim 4, wherein simultaneous selection of scanning signal lines that are respectively connected with two pixels in a pair is performed according to the count number with respect to each pair.

13. The liquid crystal display as set forth in claim 4, wherein two pixels in a pair are adjacent to each other.

14. The liquid crystal display as set forth in claim 13, wherein

each pixel positioned at downstream side in a scanning direction from the predetermined pixel and a pixel at an upstream-adjacent position of said each pixel in the scanning direction are connected with different data signal lines, and

the scanning signal lines are sequentially selected with starting from a scanning signal line connected with the predetermined pixel in such a manner that adjacent two scanning signal lines are selected simultaneously.

15. A liquid crystal display, having pixels aligned in a row direction and a column direction, the row direction being a direction in which scanning signal lines are extended,

the liquid crystal display comprising pixel columns, first data signal lines, and second data signal lines,

a first data signal line and a second data signal line being provided for each pixel column, one pixel included in the pixel column being connected with a scanning signal line and one of the first data signal line and the second data signal line, and signal potentials with opposite polarities being supplied to the first data signal line and the second data signal line, respectively,

in a case where a predetermined pixel in the pixel column is regarded as a first pixel from which counting of pixel starts, two odd-number-positioned pixels counted in a scanning direction are paired and two even-number-positioned pixels counted in the scanning direction are paired, and a group including n (n is a natural number) pair consisting of two odd-number-positioned pixels and a group including n pair consisting of two even-number-positioned pixels are alternately given count numbers,

two pixels in each pair are connected with different data signal lines, and a polarity of a signal potential supplied to a data signal line is inverted with respect to n horizontal scanning period.

16. The liquid crystal display as set forth in claim 15, wherein a group is selected according to the count number, in the selected group, scanning signal lines respectively connected with two pixels in a pair are simultaneously selected, and when n is 2 or more, the simultaneous selection is sequentially performed with respect to each pair.

17. The liquid crystal display as set forth in claim 15, wherein a polarity of a signal potential supplied to a first data signal line and a second data signal line for one of adjacent two pixel columns is different from a polarity of a signal potential supplied to a first data signal line and a second data signal line for the other of the adjacent two pixel columns.

18. The liquid crystal display as set forth in claim 15, wherein the two pixels in each pair are two pixels with successive odd count numbers or two pixels with successive even count numbers.

31. The liquid crystal display as set forth in claim 18, wherein

there are provided a plurality of retention capacitance lines whose potentials are controllable, each pixel includes a first transistor, a second transistor, a first pixel electrode, and a second pixel electrode, the first pixel electrode and the second pixel electrode are connected with a same data signal line via the first transistor and the second transistor, respectively, the first transistor and the second transistor are connected with a same scanning signal line, the first pixel electrode and the second pixel electrode form retention capacitances with different retention capacitance lines, respectively,

a retention capacitance line is provided for adjacent two pixels in the pixel column, one of a first pixel electrode and a second pixel electrode of one of the adjacent two pixels and one of a first pixel electrode and a second pixel electrode of the other of the adjacent two pixels form retention capacitances with the retention capacitance line provided for the adjacent two pixels,

retention capacitance lines that form retention capacitances with a first pixel electrode and a second pixel electrode in a first-positioned pixel positioned first among all the pixels are first-positioned and second-positioned retention capacitance lines, the second-positioned retention capacitance line also forms retention capacitance with one of a first pixel electrode and a second pixel electrode of a second-positioned pixel positioned second among all the pixels, and at a time of completion of writing of the first-positioned and second-positioned pixels or after the completion, potentials of the first-positioned and second-positioned retention capacitance lines shift simultaneously and in an opposite direction,

when every successive two odd-number-positioned retention capacitance lines are paired based on counting in a scanning direction from the first-positioned retention capacitance line, potentials of two retention capacitance lines in each pair are shifted simultaneously in a same direction, and between adjacent two pairs, shift of potentials of retention capacitance lines in a pair at upstream side of a scanning direction is followed after 2 horizontal scanning periods by shift of potentials of retention capacitance lines in a pair at downstream side of the scanning direction, and

when every successive two even-number-positioned retention capacitance lines are paired, potentials of two retention capacitance lines in each pair are shifted simultaneously in a same direction, and between adjacent two pairs, shift of potentials of retention capacitance lines in a pair at upstream side of a scanning direction is followed after 2 horizontal scanning periods by shift of potentials of retention capacitance lines in a pair at downstream side of the scanning direction.

32. A method for driving a liquid crystal display,

the liquid crystal display having pixels aligned in a row direction and a column direction, the row direction being a direction in which scanning signal lines are extended,

the liquid crystal display comprising pixel columns, first data signal lines, and second data signal lines,

a first data signal line and a second data signal line being provided for each pixel column, one pixel included in the pixel column being connected with a scanning signal line and one of the first data signal line and the second data signal line,

in a case where a predetermined pixel in the pixel column is regarded as a first pixel from which counting of a pixel starts, an odd-number-positioned pixel and an even-number-positioned pixel in a scanning direction are paired, n (n is a natural number) pairs are regarded as a group, and each group is given a count number,

each group being configured such that two pixels in each pair are connected with different data signal lines and each odd-number-positioned pixel is connected with one data signal line, and

in two groups with successive count numbers, an odd-number-positioned pixel in one group and an odd-number-positioned pixel in the other group being connected with different data signal lines,

the method comprising the steps of:

supplying signal potentials with opposite polarities to the first data signal line and the second data signal line, respectively,

inverting a polarity of a signal potential supplied to a data signal line with respect to n horizontal scanning period,

selecting a group according to the count number, and

performing simultaneous selection of scanning signal lines respectively connected with two pixels in a pair in the selected group, whereby when n is 2 or more, the simultaneous selection is sequentially performed with respect to each pair.

33. A method for driving a liquid crystal display,

the liquid crystal display having pixels aligned in a row direction and a column direction, the row direction being a direction in which scanning signal lines are extended,

the liquid crystal display comprising pixel columns, first data signal lines, and second data signal lines,

a first data signal line and a second data signal line being provided for each pixel column, one pixel included in the pixel column being connected with a scanning signal line and one of the first data signal line and the second data signal line,

in a case where a predetermined pixel in the pixel column is regarded as a first pixel from which counting of a pixel starts, an odd-number-positioned pixel and an even-number-positioned pixel counted in a scanning direction are paired, and each pair is given a count number,

two pixels in a pair being connected with different data signal lines, and

an odd-number-positioned pixel in one of two pairs with successive count numbers and an odd-number-positioned pixel in the other of the two pairs with successive count numbers being connected with a same data signal line,

the method comprising the steps of:

supplying signal potentials with opposite polarities to the first data signal line and the second data signal line, respectively,

inverting a polarity of a signal potential supplied to each data signal line with respect to each vertical scanning period, and

simultaneously selecting scanning signal lines that are respectively connected with two pixels in a pair according to the count number with respect to each pair.

34. A method for driving a liquid crystal display,

the liquid crystal display having pixels aligned in a row direction and a column direction, the row direction being a direction in which scanning signal lines are extended,

the liquid crystal display comprising pixel columns, first data signal lines, and second data signal lines,

a first data signal line and a second data signal line being provided for each pixel column, one pixel included in the pixel column being connected with a scanning signal line and one of the first data signal line and the second data signal line,

in a case where a predetermined pixel in the pixel column is regarded as a first pixel from which counting of pixel starts, two odd-number-positioned pixels counted in a scanning direction are paired and two even-number-positioned pixels counted in the scanning direction are paired, and a group including n (n is a natural number) pair consisting of two odd-number-positioned pixels and a group including n (n is a natural number) pair consisting of two even-number-positioned pixels are alternately given count numbers,

two pixels in a pair are connected with different data signal lines, the method comprising the steps of:

supplying signal potentials with opposite polarities to the first data signal line and the second data signal line, respectively,

inverting a polarity of a signal potential supplied to a data signal line with respect to n (n is a natural number) horizontal scanning period,

selecting a group according to the count number, and

simultaneously selecting scanning signal lines respectively connected with two pixels in a pair in the selected group, whereby when n is 2 or more, the simultaneous selection is sequentially performed with respect to each pair.