Liquid crystal display and manufacturing method thereof

Inactive Publication Date: 2005-02-24
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0029] The objective of the present invention is to provide a liquid crystal display which makes it possible to avoid the occurrence of a step discontinuity in an electrode for making a connection to a connecting section inside a contact hole, and a manufacturing method for such a liquid crystal display.

Problems solved by technology

However, the above-mentioned manufacturing method for the conventional liquid crystal display has raised the following problems.
Consequently, in this state, a step discontinuity occurs in the pixel display electrode 214 that is formed in a succeeding process, resulting in failure in providing electrical connections in the pixel display electrode 214.

Method used

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  • Liquid crystal display and manufacturing method thereof
  • Liquid crystal display and manufacturing method thereof
  • Liquid crystal display and manufacturing method thereof

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embodiment 1

[0092] Referring to FIGS. 1(a) and 1(b) through FIGS. 5(a) and 5(b), the following description will discuss one embodiment of the present invention.

[0093]FIG. 1(a) is a plan view that shows a construction of an array substrate (substrate) (hereinafter, referred to as “TFT: Thin Film Transistor”), and FIG. 1(b) is a cross-sectional view taken along line X-X′ of FIG. 1(a).

[0094] As illustrated in FIG. 1(a) and FIG. 1(b), the above-mentioned liquid crystal display has a TFT array substrate that is constituted by: a gate wire 2 formed on an insulation substrate 1 made of glass, etc., a sauce wire (wiring) 3 that is orthogonal to the gate wire 2, a gate signal input terminal 2a that is connected to the gate wire 2 so as to supply signals from outside to the gate wire 2, a sauce signal input terminal section 5 for supplying signals from an external driving circuit to the source wire 3, a TFT 6 that is placed in each pixel as a switching element in a matrix format, and a pixel display el...

embodiment 2

[0134] Referring to FIGS. 6(a) and 6(b) through FIGS. 13(a) to 13(d), the following description will discuss another embodiment of the present invention. Here, for convenience of explanation, those members that have the same functions as those shown in the drawings of the embodiment 1 are indicated by the same reference numerals, and the description thereof is omitted.

[0135] As illustrated in FIGS. 6(a) and 6(b), the liquid crystal display of the present embodiment is formed as follows: First, a TFT 6 having a source electrode 3b and a drain electrode 4 for providing switching operations to the pixels and a protective film (protective film layer) 14 and a resin layer 17 are stacked thereon. After having formed a contact hole 30 in the resin layer (resin insulation film) 17, the protective film 14 below this contact hole 30 is etched and removed, and an image display electrode 7 for applying a voltage to the liquid crystal is placed in the corresponding area of the contact hole 30 i...

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Abstract

An protective film and a resin layer are stacked on an insulation substrate on which a TFT is formed, and after a contact hole is formed in the resin layer, the protective film below the contact hole is etched and removed. A pixel display electrode is allowed to contact a drain electrode at the area of the contact hole; thus, a liquid crystal display is formed. A cut-out section, which communicates with the lower layer is formed in the drain electrode in the area of the contact hole. Upon forming a TFT section island-shape semiconductor layer so as to provide a TFT, a hole section island-shape semiconductor layer is also formed in the area of the contact hole. With this arrangement, it is possible to provide a manufacturing method of a liquid crystal display which can avoid the occurrence of a step discontinuity in the pixel display electrode and the subsequent disconnection in the pixel display electrode.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a liquid crystal display which drives the liquid crystal by using an active matrix substrate on which a thin-film transistor (hereinafter, referred to TFT (Thin Film Transistor) is formed, and also concerns a manufacturing method for such a liquid crystal display. BACKGROUND OF THE INVENTION [0002] As illustrated in FIG. 14, in a conventional liquid crystal display using a TFT as a switching element, on a glass substrate 101 are placed a gate electrode 102 formed through the same process, gate wiring (not shown) connected to the gate electrode 102 and a source signal input terminal 103. [0003] Moreover, a gate insulation film 105 is formed on the entire surface of the glass substrate 101, except for a terminal section contact hole 104 formed on the source signal input terminal 103. On the gate electrode 102 are placed, through a gate insulation film 105, an amorphous silicon semiconductor layer (hereinafter, referred to ...

Claims

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Application Information

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IPC IPC(8): G02F1/136G02F1/1362
CPCG02F1/13458G02F1/136286G02F1/136227G02F1/136
InventorSUGIMOTO, OSAMUIMAI, HAJIME
OwnerSHARP KK