Method for producing liquid crystal display device
View Patent ↗A method for producing a liquid crystal display device including a first irradiation step for realizing alignment of liquid crystals in a first azimuth direction on a first alignment layer by obliquely irradiating the first substrate, a second irradiation step for realizing alignment of liquid crystals in a second azimuth direction by obliquely irradiating a region of the first substrate where irradiation has not been conducted in the first irradiation step with rays in an azimuth direction that is 180 degrees different from an azimuth direction of irradiation in the first irradiation step, a third irradiation step for realizing alignment of liquid crystals in a third azimuth direction on a second alignment layer by obliquely irradiating the second substrate, and a sticking step of sticking together the first and second substrates such that the first azimuth direction and the third azimuth direction are perpendicular to each other.
1. A method for producing a liquid crystal display device including first and second substrates, a first alignment layer formed on the first substrate, and a second alignment layer formed on the second substrate, liquid crystal filled between the first and second substrates, said method comprising:
a first ultraviolet ray irradiation step of conducting an alignment-treatment for realizing an alignment of liquid crystals in a first azimuth direction on the first alignment layer by obliquely irradiating the first substrate with ultraviolet rays,
a second ultraviolet ray irradiation step of conducting an alignment-treatment for realizing an alignment of liquid crystals in a second azimuth direction, which is different from the first azimuth direction, by obliquely irradiating a region of the first substrate where ultraviolet ray irradiation has not been conducted in the first ultraviolet ray irradiation step with ultraviolet rays in an azimuth direction that is 180 degrees different from an azimuth direction of ultraviolet ray irradiation in the first ultraviolet ray irradiation step,
a third ultraviolet ray irradiation step of conducting an alignment-treatment for realizing an alignment of liquid crystals in a third azimuth direction on the second alignment layer by obliquely irradiating the second substrate with ultraviolet rays, and
a sticking step of sticking together the first and second substrates such that the first azimuth direction of the first alignment layer and the third azimuth direction of the second alignment layer are perpendicular to each other,
wherein in the first and second ultraviolet ray irradiation steps, the first substrate is obliquely irradiated with ultraviolet rays, through a mask having stripe-shaped light shielding areas and openings, in an azimuth direction parallel to a longer direction of the strip-shaped opening, and
wherein in the second ultraviolet ray irradiation step is conducted after a position of the mask is shifted by a width of a stripe of the mask relative to the first substrate.
2. A method for producing a liquid crystal display device according to claim 1 , wherein the first alignment layer is irradiated with ultraviolet rays containing a P wave in the first and second ultraviolet ray irradiation steps.
3. A method for producing a liquid crystal display device according to claim 1 , wherein the first alignment layer is irradiated with non-polarized ultraviolet rays in the first and second ultraviolet ray irradiation steps.
4. A method for producing a liquid crystal display device according to claim 1 , wherein the first alignment layer is irradiated with ultraviolet rays having wavelengths of less than or equal to 280 nm in the first and second ultraviolet ray irradiation steps.
5. A method for producing a liquid crystal display device according to claim 1 , wherein the first alignment layer is irradiated with ultraviolet rays having a degree of parallelism of smaller than 10 degrees in the first and second ultraviolet ray irradiation steps.
6. A method for producing a liquid crystal display device according to claim 1 , further comprising a fourth ultraviolet ray irradiation step of conducting an alignment-treatment for realizing an alignment of liquid crystals in a fourth azimuth direction, which is different from the third azimuth direction, by obliquely irradiating a region of the second substrate where ultraviolet ray irradiation has not been conducted in the third ultraviolet ray irradiation step with ultraviolet rays in an azimuth direction that is 180 degrees different from an azimuth direction of ultraviolet ray irradiation in the third ultraviolet ray irradiation step.
7. A method for producing a liquid crystal display device according to claim 1 , wherein the first substrate is rotated 180 degrees between the first and second ultraviolet ray irradiation steps.
8. A method for producing a liquid crystal display device according to claim 1 , wherein:
the first and second alignment layers are vertical alignment layers,
in the first ultraviolet ray irradiation step, the first alignment layer is treated to realize a liquid crystal alignment in an inclined direction with respect to a surface of the first substrate along a first direction parallel to a longer direction of the stripe-shaped opening, and
in the second ultraviolet ray irradiation step, the first alignment layer is treated to realize a liquid crystal alignment in an inclined direction with respect to a surface of the first substrate along a second direction that is 180 degrees different from the first direction.