Liquid crystal display and manufacturing methd of same

• US 20020176030A1
• Filed: 03/22/2002
• Published: 11/28/2002
• Est. Priority Date: 03/23/2001
• Status: Active Grant

• Current Assignee: NLT Technologies, Ltd. (Tianma Microelectronics Company Limited)
• Original Assignee: NEC Corporation
• Inventors: Matsumoto, Kimikazu
• Granted Patent: US 6,791,633 B2
• Time in Patent Office: Days
• US Class Current: 349/43
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/1345 Conductors connecting electrodes to cell terminals
• CPC Class Codes: G02F 1/13624 having more than one switching element per pixel
• CPC Class Codes: G02F 1/13629 Multilayer wirings
• CPC Class Codes: G09G 2300/0434 Flat panel display in which a field is applied parallel to the display plane
• CPC Class Codes: G09G 2300/0443 with several sub-pixels for the same colour in a pixel, not specifically used to display gradations G09G3/364 takes precedence
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• 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 liquid crystal display and a method for manufacturing the liquid crystal display which are capable of an inhibiting occurrence of strong flicker even when only pixels each having a same polarity are displayed on a screen, without causing a decrease in an aperture rate. In the above liquid crystal display, first and second data lines each feeding a pixel voltage being different in polarity to each of first and second pixel electrodes through first and second thin film transistors are formed in such a manner that the first data line is overlaid by the second data line with an insulating film being interposed between the first and second data lines.

Claims

1. A liquid crystal display comprising:

a plurality of unit pixels each having a liquid crystal being put in a hermetically sealed manner between a driving element substrate on which a plurality of driving regions are formed and a facing substrate wherein said plurality of regions elements are made up of a plurality of first and second driving elements driven by a same scanning line, and having first and second pixel electrodes to one of which a pixel voltage is fed from one of first and second data lines through one of said first and second driving elements and to an other of which a pixel voltage being opposite in polarity to said pixel voltage fed from said one of said first and second data line is fed from the other of said first and second data lines through the other of said first and second driving elements;

wherein said first and second data lines are formed in a manner that said second data line is disposed above said first data line and in a manner that said first data line is overlaid by said second data line with an insulating film being interposed between said first and second data lines on said driving element substrate.

2. The liquid crystal display according to claim 1, wherein said insulating film is constructed of an organic insulating film or an inorganic insulating film or a stacked layer made up of both said organic insulating film and said inorganic insulating film.

3. The liquid crystal display according to claim 1, wherein said first and second pixel electrodes and common electrodes are formed on said driving element substrate in a manner that said first and second pixel electrodes and said common electrodes are insulated from each other by an interlayer insulating film.

4. The liquid crystal display according to claim 1, wherein said first and second pixel electrodes and said first data line are formed on a same insulating film.

5. The liquid crystal display according to claim 1, wherein said first and second pixel electrodes and said second data line are covered by an oriented film.

6. The liquid crystal display according to claim 1, wherein said first and second data lines both applying a pixel voltage having a same polarity are formed so as to overlap each other.

7. The liquid crystal display according to claim 6, wherein said first and second data lines feed said pixel voltage to said first and second pixel electrodes in unit pixels being different from each other.

8. The liquid crystal display according to claim 1, wherein a colored layer is formed on said driving element substrate.

9. The liquid crystal display according to claim 3, wherein said common electrodes are in contact with said liquid crystal through said oriented film.

10. The liquid crystal display according to claim 9, wherein said second data line is formed in a manner that said second data line is disposed above said first data line and that said first data line is overlaid by said second data line with said interlayer insulating film being interposed between said second and first data lines.

11. The liquid crystal display according to claim 1, wherein said first and second pixel electrodes and said common electrodes are formed on said same interlayer insulating film covering said second data line.

12. The liquid crystal display according to claim 11, wherein said common electrodes are formed on said facing substrate.

13. The liquid crystal display according to claim 1, wherein said unit pixel is driven by a one-horizontal-reverse driving method, a one-vertical-reverse driving method, or a dot-reverse driving method.

15. The method for manufacturing the liquid crystal display according to claim 14, wherein, in said third process, as said second interlayer insulating film, an organic insulating film or an inorganic insulating film or a stacked layer made up of both said organic insulating film and inorganic insulating film is formed.

14. A method for manufacturing an liquid crystal display comprising a plurality of unit pixels each having first and second driving elements driven by a same scanning line and having first and second pixel electrodes to each of which a pixel voltage having a different polarity is applied from each of first and second data lines through each of said first and second driving elements, said method comprising:

a first process of forming a first interlayer insulating film in a manner that said first interlayer insulating film covers a scanning line after said scanning line has been formed on a transparent substrate and forming a semiconductor layer on said first interlayer insulating film;

a second process of forming a drain electrode and a source electrode on said semiconductor layer to form said first and second driving elements and forming said first and second pixel electrodes on said first interlayer insulating film and said first data line to be connected to said drain electrode of one of said first or second driving elements;

a third process of forming a contact hole in a second interlayer insulating film after said second interlayer insulating film has been formed in a manner that said second interlayer insulating film covers said driving element and forming the second data line to be connected to said drain electrode of another said driving element through said contact hole in a manner that said first data line is overlaid by said second data line with said second interlayer insulating film being interposed between said first and second data lines.