Liquid crystal display device with main columnar spacers and sub columnar spacers having different area densities

1. A liquid crystal display device comprising:

a pair of glass substrates, at least one of said substrates being an ultra-thin glass substrate;

a liquid crystal material interposed between said pair of glass substrates;

a display region corresponding to a display surface that displays an image when the liquid crystal display device operates; and

a seal pattern for bonding said pair of glass substrates to each other, said seal pattern having an injection port that is an opening through which said liquid crystal material is injected,

wherein spacer structures for keeping the distance between said pair of glass substrates within a certain range are arranged such that the area density of said spacer structures is higher in a corner portion located at a side opposed to a side where said injection port is provided than in a corner portion located at the side where said injection port is provided,

said spacer structures include:

main columnar spacers that are constantly in contact with both of said pair of glass substrates to maintain said pair of glass substrates; and

sub columnar spacers that are in contact with only one of said pair of glass substrates in a normal state and that come into contact with both of said pair of glass substrates to maintain a space between said substrates only under a state where said pair of glass substrates are brought closer to each other within a range of elastic deformation of said main columnar spacers,

said main columnar spacers are arranged at a constant density in said display region, and

said sub columnar spacers are arranged such that the area density thereof in the corner portion located at the side opposed to the side where said injection port is provided is higher than the area density thereof in the corner portion located at the side where said injection port is provided.

2. The liquid crystal display device according to claim 1 , further comprising a parallax barrier that is formed directly on a surface of said ultra-thin glass substrate.

3. The liquid crystal display device according to claim 1 , wherein said constant density is a number of spacers per pixel.

4. The liquid crystal display device according to claim 1 , wherein said constant density is uniform across an entirety of said display region.

5. The liquid crystal display device according to claim 1 , wherein said constant density is a number of spacers per pixel, and said constant density is uniform across an entirety of said display region.