Method for driving liquid crystal display apparatus

• US 6,400,350 B1
• Filed: 08/04/1998
• Issued: 06/04/2002
• Est. Priority Date: 11/13/1997
• Status: Expired due to Term

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Nishimura, Masaru, Kohno, Yasuhiko
• Primary Examiner(s): Hjerpe, Richard
• Assistant Examiner(s): Dinh, Duc Q
• Application Number:
  US09/128,762
• Time in Patent Office: 1,400 Days
• Field of Search: 345/96, 345/209, 345/152, 345/153, 345/79, 345/694-696
• US Class Current: 345/96
• CPC Class Codes: G09G 2310/0205 Simultaneous scanning of several lines in flat panels
• CPC Class Codes: G09G 2310/0251 Precharge or discharge of pixel before applying new pixel voltage
• CPC Class Codes: G09G 2320/0209 Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• 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

Abstract

A method is provided for driving an LCD apparatus in which a predetermined image is displayed by applying predetermined column signals to pixels constituting selected rows of an array of pixels arranged in columns and rows. The pixels are divided to form pluralities of groups that each have at least two pixels in either a column direction or a row direction. The column signals associated with each group are provided with a different polarity as to each adjacent group and a group characteristic is changed in different image frames. Alternatively, plural pixels in a column direction can be classified into a plurality of sets with each set including plural frames, and the polarity of the column signals for each of the sets can be changed or groups of pixels can be formed by dividing the pixels in the columns into groups all of which have at least two adjacent pixels in a direction of the columns and further with at least some of the groups having more than two pixels in the column direction and then applying column signals to each adjacent group in the column direction with a different polarity.

Claims

1. A method for driving an LCD apparatus in which a series of image frames are displayed by applying predetermined column signals to each column of aligned pixels formed as an array of pixels having further pixel alignment in a row direction across said columns to form rows of pixels and selecting at least one of said rows while said column signals are being applied during each frame, comprising:

forming groups by dividing the pixels in the columns into said groups so that each formed group has at least two adjacent pixels in a direction of the columns;

applying said column signals to each adjacent group in the column direction with a different polarity during each frame; and

changing an arrangement of at least some of the groups during different image frames,

wherein said arrangement being changed includes changing at least some of the pixels forming at least some of the groups.

2. The method for driving an LCD apparatus of claim 1, wherein the changing of the number of said pixels for forming at least some of the groups is done regularly.

3. The method for driving an LCD apparatus of claim 1, wherein the changing of the number of said pixels for forming at least some of the groups is done irregularly.

5. A method for driving an LCD apparatus in which a series of image frames are displayed by applying predetermined column signals to each column of aligned pixels formed as an array of pixels having further pixel alignment in a row direction across said columns to form rows of pixels and selecting at least one of said rows while said column signals are being applied during each frame, comprising:

forming groups by dividing the pixels in the columns into said groups so that each formed group has at least two adjacent pixels in a direction of the columns; and

applying said column signals to each adjacent group in the column direction with a different polarity during each frame,

wherein a number of rows for selecting at the same time is at least two and a row signal for controlling a row selection is not applied when polarity of a vertical clock signal changes and the same row is selected before and after a rise or fall of an edge of a signal which becomes a control reference of said vertical clock signal controlling a timing for changing said column signals.

4. The method for driving an LCD apparatus of claim 5, wherein the number of said pixels that can be formed into any group is restricted.

6. A method for driving an LCD apparatus in which a series of image frames are displayed by applying predetermined column signals to each column of aligned pixels formed as an array of pixels having further pixel alignment in a row direction across said columns to form rows of pixels and selecting at least one of said rows while said column signals are being applied during each frame, comprising:

forming groups by dividing the pixels in the columns into said groups so that each formed group has at least two adjacent pixels in a direction of the columns; and

applying said column signals to each adjacent group in the column direction with a different polarity during each frame,

wherein a number of rows for selecting at the same time is at least two and for a selected row, a preliminary charging of a pixel is made when a polarity of the column signal is the same as a polarity when a consecutive charging is made.

7. A method for driving an LCD apparatus in which a series of image frames are displayed by applying predetermined column signals to each column of aligned pixels formed as an array of pixels having further pixel alignment in a row direction across said columns to form rows of pixels and selecting at least one of said rows while said column signals are being applied during each frame, comprising:

forming groups by dividing the pixels in the columns into said groups so that each formed group has at least two adjacent pixels in a direction of the columns; and

applying said column signals to each adjacent group in the column direction with a different polarity during each frame,

wherein a number of rows for selecting at the same time is at least two and charging of a pixel is made so that, for a selected row having a charging period bridging a polarity change of the column signal, a charging in a time period is omitted when a polarity of the column signal is opposite to a polarity of the column signal of a previous frame.