Liquid crystal display device and its manufacture method in which the alignment films having different characteristics

Claim 2

A liquid crystal display device, comprising: first and second substrates disposed in parallel and facing each other at some distance; liquid crystal material with liquid crystal molecules having a negative dielectric constant anisotropy and filled in a space between said first and second substrates; first and second electrodes respectively formed on inner surfaces of said first and second substrates and defining pixels; a first projection pattern formed on a surface of said first electrode; a domain boundary regulating member formed on the inner surface of said second substrate, said domain boundary regulating member together with said first projection pattern regulating the boundary of each domain in which the liquid crystal molecules are tilted in a same direction; a first alignment film formed on the inner surface of said first substrate, covering said first electrode and said first projection pattern, said first alignment film vertically directing the liquid crystal molecules in said liquid crystal material; and a second alignment film formed on the inner surface of said second substrate, covering said second electrode and said domain boundary regulating member, said second alignment film vertically directing the liquid crystal molecules in said liquid crystal material, wherein at least characteristics of at least one of film thicknesses, materials and surface activation degrees of said first and second alignment films are different from each other, and the different characteristics are set so that a residual d.c. voltage between said first and second alignment films after an a.c. voltage is applied across said first and second electrodes becomes smaller than a residual d.c. voltage when the characteristics are the same.

Claim 3

A liquid crystal display device according to claim 1 , wherein: said domain boundary regulating member is a second projection pattern having a width narrower than a width of said first projection pattern or a slit formed in said second electrode; and said first alignment film is thinner than said second alignment film.

Claim 4

A liquid crystal display device according to claim 1 , wherein: said domain boundary regulating member is a second projection pattern having a width narrower than a width of said first projection pattern or a slit formed in said second electrode; and said first and second alignment films are made of material based on polyimide, and an imide degree of said second alignment film is smaller than an imide degree of said first alignment film.

Claim 5

A liquid crystal display device according to claim 1 , wherein: said domain boundary regulating member is a second projection pattern having a width narrower than a width of said first projection pattern or a slit formed in said second electrode; and said first alignment film is made of material based on polyimide and said second alignment film is made of material based on polyamic acid.

Claim 6

A liquid crystal display device according to claim 1 , wherein: said domain boundary regulating member is a second projection pattern having a width narrower than a width of said first projection pattern or a slit formed in said second electrode; and said first alignment film is made of material based on polyimide and said second alignment film is made of inorganic material.

Claim 9

A liquid crystal display device, comprising: first and second substrates disposed in parallel and facing each other at some distance; liquid crystal material with liquid crystal molecules having a negative dielectric constant anisotropy and filled in a space between said first and second substrates; first and second electrodes respectively formed on inner surfaces of said first and second substrates and defining pixels; a first projection pattern formed on a surface of said first electrode; a domain boundary regulating member formed on the inner surface of said second substrate, said domain boundary regulating member together with said first projection pattern regulating the boundary of each domain in which the liquid crystal molecules tilt in a same direction; a first alignment film formed on the inner surface of said first substrate, covering said first electrode and said first projection pattern, said first alignment film vertically directing the liquid crystal molecules in said liquid crystal material; and a second alignment film formed on the inner surface of said second substrate, covering said second electrode and said domain boundary regulating member, said second alignment film vertically directing the liquid crystal molecules in said liquid crystal material, wherein an area Occupied by said first projection pattern in each pixel and an area occupied by said domain boundary regulating member in each pixel are different as viewed along a substrate normal, and the area occupied by said first projection pattern and the area occupied by said domain boundary regulating member are set to that a residual d.c. voltage between said first and second alignment films after an a.c. voltage is applied across said first and second electrodes becomes smaller than a residual d.c. voltage when the area occupied by said first projection pattern and the area occupied by said domain boundary regulating member are made equal.

Claim 10

A liquid crystal display device, comprising: first and second substrates disposed in parallel and facing each other at some distance; liquid crystal material with liquid crystal molecules having a negative dielectric constant anisotropy and filled in a space between said first and second substrates; first and second electrodes respectively formed on inner surfaces of said first and second substrates and defining pixels; a first projection pattern formed on a surface of said first electrode; a domain boundary regulating member formed on the inner surface of said second substrate, said domain boundary regulating member together with said first projection pattern regulating the boundary of each domain in which the liquid crystal molecules tilt in a same direction; a first alignment film formed on the inner surface of said first substrate, covering said first electrode and said first projection pattern, said first alignment film vertically directing the liquid crystal molecules in said liquid crystal material; and a second alignment film formed on the inner surface of said second substrate, covering said second electrode and said domain boundary regulating member, said second alignment film vertically directing the liquid crystal molecules in said liquid crystal material, wherein an area Occupied by said first projection pattern in each pixel and an area occupied by said domain boundary regulating member in each pixel are different as viewed along a substrate normal, and the area occupied by said first projection pattern and the area occupied by said domain boundary regulating member are set to that a residual d.c. voltage between said first and second alignment films after an a.c. voltage is applied across said first and second electrodes becomes smaller than a residual d.c. voltage when the area occupied by said first projection pattern and the area occupied by said domain boundary regulating member are made equal.

Claim 11

A liquid crystal display device according to claim 7 , wherein said domain boundary regulating member is a second projection pattern lower than said first projection pattern, and an area occupied by the second projection pattern in each pixel is larger than an area occupied by said first projection pattern in each pixel.

Claim 12

A liquid crystal display device according to claim 7 , wherein said domain boundary regulating member is a second projection pattern made of material having a lower dielectric constant than said first projection pattern, and an area occupied by the second projection pattern in each pixel is smaller than an area occupied by said first projection pattern in each pixel.

Claim 13

A liquid crystal display device according to claim 7 , wherein said domain boundary regulating member is a second projection pattern made of material having a higher resistivity than said first projection pattern, and an area occupied by the second projection pattern in each pixel is smaller than an area occupied by said first projection pattern in each pixel.

Claim 14

A liquid crystal display device according to claim 7 , wherein said domain boundary regulating member is a slit formed in said second electrode, and an area occupied by the slit in each pixel is larger than an area occupied by said first projection pattern in each pixel.

Claim 15

A liquid crystal display device, comprising: first and second substrates disposed in parallel and facing each other at some distance; liquid crystal material with liquid crystal molecules having a negative dielectric constant anisotropy and filled in a space between said first and second substrates; first and second electrodes respectively formed on inner surfaces of said first and second substrates and defining pixels; a first projection pattern formed on a surface of said first electrode; a second projection pattern formed on the inner surface of said second substrate and being narrower and higher than said first projection pattern, said second projection pattern together with said first projection pattern regulating the boundary of each domain in which the liquid crystal molecules tilt in a same direction; a first alignment film formed on the inner surface of said first substrate, covering said first electrode and said first projection pattern, said first alignment film vertically directing the liquid crystal molecules in said liquid crystal material; and a second alignment film formed on the inner surface of said second substrate, covering said second electrode and said second projection pattern, said second alignment film vertically directing the liquid crystal molecules in said liquid crystal material.

Claim 16

A liquid crystal display device, comprising: first and second substrates disposed in parallel and facing each other at some distance; liquid crystal material with liquid crystal molecules having a negative dielectric constant anisotropy and filled in a space between said first and second substrates; first and second electrodes respectively formed on inner surfaces of said first and second substrates and defining pixels; a first projection pattern formed on a surface of said first electrode; a second projection pattern formed on the inner surface of said second substrate and being narrower and higher than said first projection pattern, said second projection pattern together with said first projection pattern regulating the boundary of each domain in which the liquid crystal molecules tilt in a same direction; a first alignment film formed on the inner surface of said first substrate, covering said first electrode and said first projection pattern, said first alignment film vertically directing the liquid crystal molecules in said liquid crystal material; and a second alignment film formed on the inner surface of said second substrate, covering said second electrode and said second projection pattern, said second alignment film vertically directing the liquid crystal molecules in said liquid crystal material.

Claim 17

A liquid crystal display device, comprising: first and second substrates disposed in parallel and facing each other at some distance; liquid crystal material with liquid crystal molecules having a negative dielectric constant anisotropy and filled in a space between said first and second substrates; first and second electrodes respectively formed on inner surfaces of said first and second substrates and defining pixels; a first projection pattern formed on a surface of said first electrode; a second projection pattern formed on the inner surface of said second substrate and having a different width and a different material from said first projection pattern, said second projection pattern together with said first projection pattern regulating the boundary of each domain in which the liquid crystal molecules tilt in a same direction; a first alignment film formed on the inner surface of said first substrate, covering said first electrode and said first projection pattern, said first alignment film vertically directing the liquid crystal molecules in said liquid crystal material; and a second alignment film formed on the inner surface of said second substrate, covering said second electrode and said second projection pattern, said second alignment film vertically directing the liquid crystal molecules in said liquid crystal material, wherein materials of said first and second projection patterns are set so that a residual d.c. voltage between said first and second alignment films after an a.c. voltage is applied across said first and second electrodes becomes smaller than a residual d.c. voltage when said first and second projection patterns are made of a same material.

Claim 18

A liquid crystal display device, comprising: first and second substrates disposed in parallel and facing each other at some distance; liquid crystal material with liquid crystal molecules having a negative dielectric constant anisotropy and filled in a space between said first and second substrates; first and second electrodes respectively formed on inner surfaces of said first and second substrates and defining pixels; a first projection pattern formed on a surface of said first electrode; a second projection pattern formed on the inner surface of said second substrate and having a different width and a different material from said first projection pattern, said second projection pattern together with said first projection pattern regulating the boundary of each domain in which the liquid crystal molecules tilt in a same direction; a first alignment film formed on the inner surface of said first substrate, covering said first electrode and said first projection pattern, said first alignment film vertically directing the liquid crystal molecules in said liquid crystal material; and a second alignment film formed on the inner surface of said second substrate, covering said second electrode and said second projection pattern, said second alignment film vertically directing the liquid crystal molecules in said liquid crystal material, wherein materials of said first and second projection patterns are set so that a residual d.c. voltage between said first and second alignment films after an a.c. voltage is applied across said first and second electrodes becomes smaller than a residual d.c. voltage when said first and second projection patterns are made of a same material.