Active matrix type liquid crystal display panel and a method for producing the same, having a construction capable of preventing breakdown of the switching elements or deterioration due to static electricity

An active matrix type liquid crystal display panel comprising a first and a second insulating substrates which face each other, said first insulating substrate including:

• first bus lines formed on a face of said first insulating substrate, the face facing said second insulating substrate;
• second bus lines crossing said first bus lines;
• a short-circuit line for short-circuiting said first bus lines to said second bus lines, said short-circuit line crossing said first bus lines at end portions thereof and crossing said second bus lines at end portions thereof;
• and
• a plurality of elements for electrically connecting said short-circuit line to one of said first bus lines and said second bus lines, said elements being respectively formed at said crossings of said short-circuit line and said first bus lines and at said crossings of said short-circuit line and said second bus lines,
• wherein each of said elements includes:
• part of a corresponding one of said end portions of said first bus lines or part of a corresponding one of said end portions of said second bus lines;
• a corresponding part of said short-circuit line;
• and an insulating thin film formed between said short-circuit line and said corresponding one of said end portions of said first bus lines or said corresponding one of said end portion of said second bus lines, and
• wherein said short-circuit line has a first portion parallel to said first bus lines and a second portion parallel to said second bus lines, and said insulating thin film is an oxide film formed by anodizing a surface of said corresponding one of said end portions of said first bus line or a surface of said first portion of said short-circuit line.

A method for producing an active matrix type liquid crystal display panel comprising a first and a second insulating substrates which face each other, said method comprising a process for producing said first insulating substrate, said process including the steps of:

• forming first bus lines on a face of said first insulating substrate, the face facing said second insulating substrate;
• forming second bus lines crossing said first bus lines, said second bus lines being electrically insulated from said first bus lines;
• and
• forming a short-circuit line for short-circuiting said first bus lines to said second bus lines, said short-circuit line crossing said first bus lines in end portions thereof and crossing said second bus lines in end portions thereof,
• wherein said step of forming a short-circuit line includes a step of forming elements by forming insulating thin films on said end portions of said first bus lines and on said end portions of said second bus lines and by forming said short-circuit line to cover said insulating thin films, each of said elements including part of corresponding one of said end portions of said first bus lines or part of a corresponding one of said end portions of said second bus lines;
• a corresponding part of said short-circuit line;
• and a corresponding one of said insulating thin films, and wherein said step for forming elements includes a step of anodizing surfaces of said end portions of said first bus line or surfaces of said end portions of said second bus lines, thereby forming said insulating thin films.

A method for producing an active matrix type liquid crystal display panel comprising a first and a second insulating substrates which face each other, said method comprising a process for producing said first insulating substrate, said process including the steps of:

• forming first parallel lines including first bus lines and a first short-circuit line on a face of said first insulating substrate, the face facing said second insulting substrate;
• forming insulating thin films on said first lines by anodizing surfaces of said first lines;
• and
• forming second parallel lines including second bus lines and a second short-circuit line on said insulating thin films, said second lines crossing said first lines.

A method for producing an active matrix type display panel, comprising the steps of:

• forming a plurality of one of scanning lines and signal lines, and forming at least an end portion for each of a plurality of the other of said scanning lines and said signal lines;
• forming an insulating film on at least a part of each of said plurality of one of said scanning lines and said signal lines and each of said end portions of the other of said scanning lines and said signal lines by anodization;
• and
• forming a short-circuit line on said insulating film on each of said parts while forming a remaining portion of each of said plurality of the other of said scanning lines and said signal lines.