Liquid crystal display device with orientation control projection having light shielding
View Patent ↗The present invention lowers leaking of light at the time of performing a black display of VA-type liquid crystal display device and, at the same time, prevents lowering of a numerical aperture. In a liquid crystal display device having a liquid crystal display panel which sandwiches a liquid crystal material between a first substrate having a pixel electrode and a second substrate having a counter electrode, the second substrate includes an orientation control projection which is formed by forming a conductive film on the second substrate, by forming an insulation film on the conductive film and, thereafter, by patterning the insulation film, and a light shielding layer which is formed by patterning the conductive film using the orientation control projection as a mask.
1. A liquid crystal display device having a liquid crystal display panel which sandwiches a liquid crystal material between a pair of substrates, wherein
the pair of substrates consist of a first substrate having a pixel electrode and a second substrate having a counter electrode,
one of the pair of substrates includes an orientation control projection which is formed by forming a conductive film on the one of the pair of substrates, by forming an insulation film on the conductive film and, thereafter, by patterning the insulation film,
a light shielding layer which is formed by patterning the conductive film using the orientation control projection as a mask, wherein the light shielding layer has an outer periphery thereof as viewed from above a planar surface of the substrate arranged inside an outer periphery of the orientation control projection and, at the same time, a whole side surface of the outer periphery of the light shielding layer is not covered with the orientation control projection, wherein
the one of the pair of substrates has a step forming layer which forms two thicknesses as a thickness of a layer of the liquid crystal material between the counter electrode and the pixel electrode, and
the orientation control projection and the light shielding layer pass an end portion of the step forming layer and extend over two regions which differ in the thickness of the layer of the liquid crystal material.
2. A liquid crystal display device according to claim 1 , wherein the orientation control projection and the light shielding layer are arranged between the counter electrode and the pixel electrode.
3. A liquid crystal display device according to claim 1 , wherein the one of the pair of substrates is the first substrate.
4. A liquid crystal display device according to claim 1 , wherein the one of the pair of substrates is the second substrate.
5. A liquid crystal display device according to claim 1 , wherein the outer periphery of the light shielding layer is spaced apart from the outer periphery of the orientation control projection with a substantially fixed distance therebetween at respective points of the outer periphery of the light shielding layer.
6. A liquid crystal display device according to claim 1 , wherein in the liquid crystal display panel, when a potential difference between the pixel electrode and the counter electrode is 0 (zero), liquid crystal molecules in the liquid crystal material are oriented in the direction perpendicular to a planar surface of the substrate.