Color liquid crystal display unit

• US 6,327,008 B1
• Filed: 12/05/1996
• Issued: 12/04/2001
• Est. Priority Date: 12/12/1995
• Status: Expired due to Term

• Current Assignee: Eidos Advanced Display LLC
• Original Assignee: ALPS Electric Company Limited (Alps Alpine Co., Ltd.), LG Philips Company Limited (LG Display Co., Ltd.)
• Inventors: Fujiyoshi, Tatsumi
• Primary Examiner(s): TON, MINH TOAN T
• Application Number:
  US08/760,539
• Time in Patent Office: 1,825 Days
• Field of Search: 345/96, 349/33, 349/37, 349/106
• US Class Current: 349/106
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2310/0224 Details of interlacing
• 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

Abstract

In a color liquid crystal display unit capable of making oblique stripes in a beat noise form inconspicuous, interlaced driving is adopted, a color filter having colors different for each dot is used, the color arrangement in the color filter is distributed uniformly over the entire frame, and nearby dots in the same color is driven by driving voltage having different polarity in the same field.

Claims

1. A color liquid crystal display unit comprising:

a first substrate;

a second substrate disposed over the first substrate;

a thin-film transistor (TFT) circuit provided on the first substrate, said TFT circuit including scanning lines and signal lines wired in a matrix form, and a plurality of TFTs and associated pixel electrodes are provided along horizontal rows such that adjacent pixel electrodes in each horizontal row are separated by one signal line, and along vertical columns separated such that adjacent pixel electrodes in each vertical column are separated by one scanning line;

a common electrode formed on the second electrode,

a micro color filter provided on the second electrode, said micro color filter including a plurality of color filter portions arranged in rows and columns corresponding to said pixel electrodes such that each color filter portion is formed over an associated one of said pixel electrodes, each color filter portion being either red, green or blue;

liquid crystal material disposed between the substrates; and

an interlaced driving system connected to said scanning lines and signal lines, said interlaced driving system generating driving signals for producing an image on said color liquid display unit such that each frame is divided into a first field and a second field, the scanning lines are sequentially scanned such that odd-numbered scanning lines are scanned in the first field and even-numbered scanning lines are scanned in the second field,

wherein the color filter potions on said micro color filter are arranged such that each horizontal row aligned parallel to the scanning lines includes a first green color filter portion, a second green color filter portion located immediately adjacent said first green color filter portion, a first blue color filter portion located immediately adjacent said second green color filter portion, a second blue color filter portion located immediately adjacent said first blue color filter portion, a first red color filter portion located immediately adjacent said second blue color filter portion, and a second red color filter portion located immediately adjacent said first red color filter portion, and

wherein said interlaced driving system includes means for driving said TFTs such that the pixel electrodes associated with said first and the color filter portions for the horizontal rows repeating after two intervening horizontal rows second green color filter portions and associated with an odd-numbered scan line are driven in the first field with driving voltages having opposite polarities.

2. A color liquid crystal display unit according to claim 1, wherein repetitive units formed by the sequence of a green color filter portion, a red color filter portion, and a blue color filter portion are sequentially arranged along each vertical column.

3. A color liquid crystal display unit comprising:

a first substrate;

a second substrate disposed over the first substrate;

a thin-film transistor (TFT) circuit provided on the first substrate, said TFT circuit including scanning lines and signal lines wired in a matrix form, and a plurality of TFTs and associated pixel electrodes are provided along horizontal rows such that adjacent pixel electrodes in each horizontal row are separated by one signal line, and along vertical columns separated such that adjacent pixel electrodes in each vertical column are separated by one scanning line;

a common electrode formed on the second substrate,

a micro color filter provided on the second substrate, said micro color filter including a plurality of color filter portions arranged in rows and columns corresponding to said pixel electrodes such that each color filter portion is formed over an associated one of said pixel electrodes, each color filter portion being either red, green or blue;

liquid crystal material disposed between the substrates; and

an interlaced driving system connected to said scanning lines and said signal lines, said interlaced driving system generating driving signals for producing an image on said color liquid display unit such that each frame is divided into a first field and a second field, the scanning lines are sequentially scanned such that odd-numbered scanning lines are scanned in the first field and even-numbered scanning lines are scanned in the second field,

wherein the color filter portions on said micro color filters are arranged such that each horizontal row aligned parallel to the scanning lines includes a first green color filter portion, a first blue color filter portion located immediately adjacent said first green color filter portion, and a first red color filter portion located immediately adjacent said first blue color filter portion, and arranged such that a first vertical column aligned in parallel with said signal lines includes said first green color filter portion, a first nongreen color filter portion located immediately below said first green color filter portion, a second green color filter portion located immediately below said first non-green color filter portion, and a second non-green color filter portion located immediately below said second green color filter portion,

wherein both said first and second non-green color filter portions are either blue or red, and

wherein said interlaced driving system includes means for driving said TFTs such that the pixel electrodes associated with said first and second green color filter portions and associated with sequential odd-numbered scan lines are driven in the first field with driving voltages having opposite polarities.