Reflective liquid crystal display device having cholesteric liquid crystal color filter and controlled liquid crystal black matrix in the non-display region
View Patent ↗A reflective liquid crystal display device includes a first substrate including a display region and a first non-display region, the first non-display region being disposed at a boundary of the display region. A second substrate faces and is spaced apart from the first substrate, the second substrate including a second non-display region corresponding to a portion larger than the first substrate. A light absorption layer is on an inner surface of the first substrate. A cholesteric liquid crystal color filter (CCF) layer is at the display region and the first non-display region is on the light absorption layer. A common electrode is on the CCF layer. An array element is on an inner surface of the second substrate. A light shielding pattern is on the array element, the light shielding pattern corresponding to the CCF layer at the first non-display region. A retardation plate and a polarizing plate are sequentially formed on the outer surface of the second substrate. A liquid crystal layer is interposed between the common electrode and the array element.
1. A method of manufacturing a reflective liquid crystal display device, comprising:
providing a first substrate including a display region and a first non-display region, the first non-display region being disposed at a boundary of the display region;
forming a light shielding pattern of a transparent conductive material at the first non-display region adjacent to the display region, wherein the light shielding pattern is simultaneously formed with a pixel electrode using the same material as the pixel electrode, wherein the pattern completely surrounds the display region;
forming a light absorption layer on an inner surface of the first substrate;
forming a cholesteric liquid crystal color filter (CCF) layer at the display region and the first non-display region on the light absorption layer;
applying a same signal to the light shielding pattern at the first non-display region adjacent to the display region and a common electrode over a second substrate; and
forming a liquid crystal layer between the light shielding pattern and the common electrode, wherein the liquid crystal layer is a π-cell having a retardation of λ/2,
wherein the pattern corresponds to the cholesteric liquid crystal color filter layer at the first non-display region.
2. The method according to claim 1 , wherein the pattern is electrically isolated from the pixel electrode.
3. The method according to claim 1 , wherein the pattern is connected to a common electrode of a second substrate through a silver (Ag) dot point for an electric connection between the first and second substrates.