Liquid crystal display and image display device using the same

• US 20020021398A1
• Filed: 08/08/2001
• Published: 02/21/2002
• Est. Priority Date: 08/09/2000
• Status: Active Grant

• Current Assignee: Vista Peak Ventures LLC (Dominion Harbor Enterprises, LLC)
• Original Assignee: NEC LCD Technologies Limited (NEC Corporation)
• Inventors: Matsumoto, Seiichi
• Granted Patent: US 6,683,661 B2
• Time in Patent Office: Days
• US Class Current: 349/149
• CPC Class Codes: G02F 1/1345 Conductors connecting electrodes to cell terminals
• CPC Class Codes: G02F 2201/121 common or background

Abstract

A liquid crystal display (LCD) is provided which is capable of reducing wiring resistance at a routing section of a common wiring and changes in a common voltage to be applied to the common wiring, thus achieving a reduction in “color degradation” and “horizontal stroke” in the LCD and of reducing “luminance irregularity”. The liquid crystal display (LCD) has a first routing section made up of a metal film having very low transmittance of light emitted from a backlight and formed in a manner that a gap between blocks being adjacent along one side of a display area is almost filled in and a second routing section made up of the above metal film and formed in a manner that a region surrounded by an outer side portion of a block mounted outside the display area and by straight lines being four sides of the display area which have extended toward end portions of a glass substrate is almost filled in.

Claims

1. A liquid crystal display comprising:

a liquid crystal cell disposed at each point of intersections of a plurality of scanning lines, extending in a row direction, mounted at specified intervals in a display area being approximately quadrangular in shape placed at a predetermined position on a glass substrate being approximately quadrangular in shape and of a plurality of signal lines, extending in a column direction, mounted at specified intervals and containing a common electrode;

signal terminals mounted at either or both of upper end portions or lower end portions of said glass substrate at a specified pitch, to which end portions of said signal lines routed to either or both of an upper portion on an upper side or of a lower portion on a lower side of said display area and divided into two or more blocks and gathered are connected;

scanning terminals mounted at either or both of left end portions or right end portions of said glass substrate at a specified pitch, to which end portions of said scanning lines routed to either or both of a left portion on a left side or of a right portion on a right side of said display area and divided into two or more blocks and gathered are connected;

common signal lines each being mounted in each row and each column in said display area used to apply a common voltage to said common electrode;

common wirings each being mounted at either or both of an upper portion on an upper side or of a lower portion on a lower side of said display area and mounted at either or both of a left portion on a left side or of a right portion on a right side of said display area, to which each of end portions of a plurality of said common signal lines is connected;

a first routing section made up of a metal film having very low transmittance of light emitted from a backlight and formed in a manner that a gap between blocks being adjacent to each other along one side of said display area is almost filled in, and wherein one portion facing said display area of which is connected to said common wiring;

a second routing section made up of said metal film and formed in a manner that a region surrounded by an outer side portion of each of said blocks and by straight lines being four side lines of said display area being extended toward an end portion of said glass substrate is almost filled in, and wherein one portion facing said display area of which is connected to said common wiring; and

a plurality of common terminals mounted so as to be adjacent to said signal terminal or said scanning terminal connected to an end portion of each of said signal lines or said scanning lines making up an outermost portion of each of said blocks and formed on said first routing section and said second routing section at an end portion of said glass substrate.

2. The liquid crystal display according to claim 1, wherein said first routing section and said second routing section formed at either or both of said left portion on said left side or of said right portion on said right side of said display area are formed on a same layer as a plurality of said scanning lines is formed and connected to said common wiring through a contact hole and wherein said first section and said second section formed at either or both of said upper portion on said upper side or of said lower portion on said lower side of said display area are formed on a same layer as a plurality of said signal lines is formed and connected to said common wiring through said contact hole.

3. The liquid crystal display according to claim 1, wherein each of said common wirings is made up of a longitudinal line and a horizontal line contacting sides of said display area and wherein said longitudinal line is formed on a same layer as a plurality of said signal lines is formed and said horizontal line is formed on a same layer as a plurality of said scanning lines is formed and said common wirings are connected to each other at a region where said longitudinal line and horizontal line are overlapped through contact holes and wherein each of said common signal lines is formed on a same layer as each of a plurality of said scanning lines is formed and connected to said longitudinal line through contact holes.

4. The liquid crystal display according to claim 1, wherein said first routing section and said second routing section are formed in a manner that each of said routing sections is placed far, by an interval being equal to a predetermined pitch, from said scanning lines or said signal lines being positioned at outermost portions of blocks adjacent to each other.

5. A liquid crystal display comprising:

a liquid crystal cell disposed at each point of intersections of a plurality of scanning lines, extending in a row direction, mounted at specified intervals in a display area being approximately quadrangular in shape placed at a predetermined position on a glass substrate being approximately quadrangular in shape and of a plurality of signal lines, extending in a column direction, mounted at specified intervals, and containing a common electrode;

signal terminals mounted at either or both of upper end portions or lower end portions of said glass substrate at a specified pitch, to which end portions of said signal lines routed to either or both of an upper portion on an upper side or of a lower portion on a lower side of said display area and divided into two or more blocks and gathered are connected;

scanning terminals mounted at either or both of left end portions or right end portions of said glass substrate at a specified pitch, to which ends of said scanning lines routed to either or both of a left portion on a left side or of a right portion on a right side of said display area and divided into two or more blocks and gathered are connected;

common signal lines each being mounted in each row and each column in said display area used to apply a common voltage to said common electrode;

common wirings each being mounted at either or both of an upper portion on an upper side or of a lower portion on a lower side of said display area and mounted at either or both of a left portion on a left side or of a right portion on a right side of said display, to which each of end portions of a plurality of said common signal lines is connected;

a first routing section made up of a metal film having very low transmittance of light emitted from a backlight and formed in a manner that a gap between blocks, being adjacent to each other, formed in a manner so as to surround said display area, is almost filled in, and wherein one portion facing said display area of which is connected to said common wiring;

a second routing section made up of said metal film and formed in a manner that a region surrounded by an outer side portion of each of said blocks and by a straight line being one side being orthogonal to one side of said display area along which said block contacts, being extended toward an end portion of said glass substrate, is almost filled in, and wherein one portion facing said display area of which is connected to said common wiring; and

a plurality of common terminals mounted so as to be adjacent to said signal terminal or said scanning terminal connected to an end portion of said signal line or said scanning line making up an outermost portion of each of said blocks and formed on said first and second routing sections at an end portion of said glass substrate.

6. The liquid crystal display according to claim 5, wherein said first routing section facing a corner portion of said display area is made up of a first approximate trapezoidal portion formed on a same layer as a plurality of said scanning lines is formed and of a second approximate trapezoidal portion formed on a same layer as a plurality of said signal lines is formed,

wherein said first approximate trapezoidal portion is formed in a manner that it reaches a place being positioned opposite to said scanning line disposed at an outermost portion of said adjacent blocks where a straight line connecting an end of each of said signal terminals mounted at said specified pitch and an end of each of said scanning terminals on a side of said display area is extended and where said common wiring is extended,

wherein said second approximate trapezoidal portion is formed in a manner that it reaches a place being positioned opposite to said signal line disposed at an outermost portion of said adjacent blocks where a straight line connecting an end of each of said signal terminals mounted at said specified pitch and an end of each of said scanning terminals on a side of said display area is extended and where said common wiring is extended, and

wherein said first approximate trapezoidal and said second approximate trapezoidal portion are connected to each other at a portion where they are overlapped through contact holes with specified numbers and at a specified pitch.

7. The liquid crystal display according to claim 5, wherein each of said common wirings is made up of a longitudinal line and a horizontal line contacting sides of said display area and wherein said longitudinal line is formed on a same layer as a plurality of said signal lines is formed and said horizontal line is formed on a same layer as a plurality of said scanning lines is formed and said common wirings are connected to each other at a region where said longitudinal line and horizontal line are overlapped through contact holes and wherein each of said common signal lines is formed on a same layer as each of a plurality of said scanning lines is formed and connected to said longitudinal line through contact holes.

8. The liquid crystal display according to claim 5, wherein said first routing section and said second routing section are formed in a manner that each of said routing sections is placed far, by an interval being equal to a predetermined pitch, from said scanning lines or said signal lines being positioned at outermost portions of blocks adjacent to each other.

9. An image display device provided with a liquid crystal display comprising:

a liquid crystal cell disposed at each point of intersections of a plurality of scanning lines, extending in a row direction, mounted at specified intervals in a display area being approximately quadrangular in shape placed at a predetermined position on a glass substrate being approximately quadrangular in shape and of a plurality of signal lines, extending in a column direction, mounted at specified intervals and containing a common electrode;

signal terminals mounted at either or both of upper end portions or lower end portions of said glass substrate at a specified pitch, to which end portions of said signal lines routed to either or both of an upper portion on an upper side or of a lower portion on a lower side of said display area and divided into two or more blocks and gathered are connected;

scanning terminals mounted at either or both of left end portions or right end portions of said glass substrate at a specified pitch, to which end portions of said scanning lines routed to either or both of a left portion on a left side or of a right portion on a right side of said display area and divided into two or more blocks and gathered are connected;

common signal lines each being mounted in each row and each column in said display area used to apply a common voltage to said common electrode;

common wirings each being mounted at either or both of an upper portion on an upper side or of a lower portion on a lower side of said display area and mounted at either or both of a left portion on a left side or of a right portion on a right side of said display area, to which each of end portions of a plurality of said common signal lines is connected;

a first routing section made up of a metal film having very low transmittance of light emitted from a backlight and formed in a manner that a gap between blocks being adjacent to each other along one side of said display area is almost filled in, and wherein one portion facing said display area of which is connected to said common wiring;

a second routing section made up of said metal film and formed in a manner that a region surrounded by an outer side portion of each of said blocks and by straight lines being four side lines of said display area being extended toward an end portion of said glass substrate is almost filled in, and wherein one portion facing said display area of which is connected to said common wiring; and

a plurality of common terminals mounted so as to be adjacent to said signal terminal or said scanning terminal connected to an end portion of each of said signal lines or said scanning lines making up an outermost portion of each of said blocks and formed on said first routing section and said second routing section at an end portion of said glass substrate.

10. An image display device provided with a liquid crystal display comprising

a liquid crystal cell disposed at each point of intersections of a plurality of scanning lines, extending in a row direction, mounted at specified intervals in a display area being approximately quadrangular in shape placed at a predetermined position on a glass substrate being approximately quadrangular in shape and of a plurality of signal lines, extending in a column direction, mounted at specified intervals, and containing a common electrode;

signal terminals mounted at either or both of upper end portions or lower end portions of said glass substrate at a specified pitch, to which end portions of said signal lines routed to either or both of an upper portion on an upper side or of a lower portion on a lower side of said display area and divided into two or more blocks and gathered are connected;

scanning terminals mounted at either or both of left end portions or right end portions of said glass substrate at a specified pitch, to which ends of said scanning lines routed to either or both of a left portion on a left side or of a right portion on a right side of said display area and divided into two or more blocks and gathered are connected;

common signal lines each being mounted in each row and each column in said display area used to apply a common voltage to said common electrode;

common wirings each being mounted at either or both of an upper portion on an upper side or of a lower portion on a lower side of said display area and mounted at either or both of a left portion on a left side or of a right portion on a right side of said display, to which each of end portions of a plurality of said common signal lines is connected;

a first routing section made up of a metal film having very low transmittance of light emitted from a backlight and formed in a manner that a gap between blocks, being adjacent to each other, formed in a manner so as to surround said display area, is almost filled in, and wherein one portion facing said display area of which is connected to said common wiring;

a second routing section made up of said metal film and formed in a manner that a region surrounded by an outer side portion of each of said blocks and by a straight line being one side being orthogonal to one side of said display area along which said block contacts, being extended toward an end portion of said glass substrate, is almost filled in, and wherein one portion facing said display area of which is connected to said common wiring; and

a plurality of common terminals mounted so as to be adjacent to said signal terminal or said scanning terminal connected to an end portion of said signal line or said scanning line making up an outermost portion of each of said blocks and formed on said first and second routing sections at an end portion of said glass substrate.