Liquid crystal display with dummy data driving to produce edge column compensation

• US 5,946,068 A
• Filed: 07/15/1997
• Issued: 08/31/1999
• Est. Priority Date: 09/17/1996
• Status: Expired due to Term

• Current Assignee: Samsung Display Company Limited (Samsung Group)
• Original Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Inventors: Cho, Hyun-Sang, Kim, Seok-Tae, Lee, Sang-Chul, Lee, Hyong-Gon, Lee, Ju-Man
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Horney, Kari M.
• Application Number:
  US08/893,162
• Time in Patent Office: 777 Days
• Field of Search: 349/143, 345/96
• US Class Current: 349/143
• CPC Class Codes: G09G 2320/02 Improving the quality of display appearance
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general

Abstract

A liquid crystal display and method of operating the display includes an array of LCD elements arranged as a plurality of rows and a plurality of columns. A respective one of a plurality of data lines is connected to a respective column of LCD elements. A column of dummy LCD elements is disposed adjacent an outermost column of the array of LCD elements, and a dummy data line is connected to the dummy LCD elements of the column of dummy LCD elements. Preferably, a respective one of the plurality of data lines extends along a side of the column of LCD elements to which it is connected, between the column of LCD elements to which it is connected and an adjacent column of LCD elements, and the dummy data line extends along a side of the column of dummy LCD elements, between the column of dummy elements and the adjacent outermost column of the array of LCD elements. Data line driving means may be provided for driving a respective one of the plurality of data lines with a respective data signal having a respective polarity, a data signal driving a respective data line having a polarity which is inverted with respect to the polarity of a data signal driving an adjacent column of LCD elements. Dummy data line driving means may be provided for driving the dummy data line with a dummy data signal which has a polarity which is inverted with respect to the polarity of the data signal driving the data line connected to the outermost column of LCD elements. The column of dummy LCD elements may be obscured from a user of the LCD.

Claims

1. A liquid crystal display (LCD), comprising:

an array of LCD elements arranged as a plurality of rows and a plurality of columns;

a plurality of data lines, a respective one of which is connected to a respective column of LCD elements;

a column of dummy LCD elements adjacent an outermost column of said array of LCD elements;

a dummy data line connected to said dummy LCD elements of said column of dummy LCD elements;

data line driving means for driving a respective one of said plurality of data lines with a respective data signal having a respective polarity which is inverted with respect to the polarity of a data signal driving an adjacent column of LCD elements; and

dummy data line driving means for driving said dummy data line with a dummy data signal which has a polarity which is inverted with respect to the polarity of the data signal driving said data line connected to said outermost column of LCD elements.

2. An LCD according to claim 1:

wherein a respective one of said plurality of data lines extends along a side of said column of LCD elements to which it is connected, between said column of LCD elements to which it is connected and an adjacent column of LCD elements; and

wherein said dummy data line extends along a side of said column of dummy LCD elements, between said column of dummy elements and said adjacent outermost column of said array of LCD elements.

3. An LCD according to claim 1, wherein said array of LCD elements is viewable by a user of the LCD, and wherein said column of dummy LCD elements is obscured from a user of the LCD.

4. A liquid crystal display (LCD), comprising:

an array of LCD elements arranged as a plurality of rows and a plurality of columns;

a plurality of data lines, a respective one of which is connected to a respective column of LCD elements;

data line driving means for driving a data line connected to a column of LCD elements adjacent an outermost column of LCD elements with a data signal having a first polarity; and

dummy data line driving means for driving a data line connected to said outermost column of LCD elements with a dummy data signal which has a second polarity which is inverted with respect to said first polarity,

wherein said outermost column of LCD elements is obscured.

5. An LCD according to claim 4, wherein a respective one of said plurality of data lines extends along a side of said column of LCD elements to which it is connected, between said column of LCD elements to which it is connected and an adjacent column of LCD elements.

6. A method of operating a liquid crystal display including an array of LCD elements arranged as a plurality of rows and a plurality of columns and a plurality of data lines, a respective one of which is connected to a respective column of LCD elements, the method comprising the steps of:

driving a data line connected to a column of LCD elements adjacent an outermost column of LCD elements with a data signal having a first polarity; and

driving a dummy data line connected to the outermost column of the plurality of columns of LCD elements with a dummy data signal which has a second polarity which is inverted with respect to the first polarity.

7. A method according to claim 6, further comprising the step of obscuring the outermost column of LCD elements.