Active matrix color display screen without crossing of address line conductors and command column conductors

• US 4,950,058 A
• Filed: 01/05/1989
• Issued: 08/21/1990
• Est. Priority Date: 01/11/1988
• Status: Expired due to Fees

• Current Assignee: Commissariat a L'Energie Atomique (AES Corporation)
• Original Assignee: Commissariat a L'Energie Atomique (AES Corporation)
• Inventors: Leroux, Thierry, Diem, Bernard
• Primary Examiner(s): Miller, Stanley D.
• Assistant Examiner(s): Mai, Huy K.
• Application Number:
  US07/293,638
• Time in Patent Office: 593 Days
• Field of Search: 350/339 F, 350/333, 350/334, 340/719, 340/784
• US Class Current: 349/143
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 2201/122 having a particular pattern
• CPC Class Codes: G02F 2201/52 RGB geometrical arrangements

Abstract

The elemental image points of color red, green blue forming a color image point are disposed in a triangle. An elemental image point is comprised of a thin film transistor connected to an electrode of a condenser, this electrode facing a second, colored electrode. The electrodes connected to a transistor are arrayed in lines, the other in columns. Each column of electrodes corresponding to a color successively red, green, blue. Three electrodes connected to three thin film transistors and forming a color image point are connected to one and the same address line conductor.

Claims

1. Active matrix color display screen without crossing of address line conductors (Li, Li-1) and signal column conductors (Cj-1;

Cj;

Cj+2), comprising;

a first surface and a second transparent surface;

a liquid crystal interposed between the first and second surfaces;

a plurality of color image points, each color image point being formed of three elemental image points (20, 22,

     24) of the color red, green and blue disposed in a triangle in the plane of the display screen;

each elemental image point (20, 22,

     24) comprising a liquid crystal cell being formed of a first electrode on the first surface, a second electrode (R, G, B) on the second surface, the liquid crystal contained between the first and second electrodes, and a thin film transistor being located on the first surface, said transistor being connected at its base to an address line conductor (Li, Li-1), at its collector to a reference potential conductor (Vref), and at its emitter to the first electrode of the liquid crystal cell;

the first electrodes of the first surface being arranged in a plurality of lines of first electrodes;

the second electrodes (R, G, B) of the second surface being arranged in a plurality of columns of second electrodes, each column of second electrodes corresponding to a color successively red, green, blue, and the second electrodes (R, G, B) of a column being connected between themselves by a signal column conductor (Cj-1;

Cj;

Cj+1);

each address line conductor (Li, Li-1) being common to two adjacent lines of first electrodes, each reference potential conductor (Vref) being common to two adjacent lines of first electrodes, whereby at one side of a given line of first electrodes and paralleling that given line there is an address line conductor (Li, Li-1) and on the other side of that given line of first electrodes and paralleling that given line there is a reference potential conductor (Vref).