Liquid crystal display device

Abstract

There is disclosed a liquid crystal display device comprising an array substrate, an counter substrate, and a liquid crystal layer which is held between the array substrate and the counter substrate and whose liquid crystal molecular arrangement is divided into a plurality of pixel areas controlled by the array substrate and opposite substrate. The array substrate includes a reflective pixel electrode for scattering a light incident via the counter substrate and liquid crystal layer. The reflective pixel electrode has a reflective surface in which a first undulation having a gradual inclined surface disposed in each pixel area and a second undulation having a plurality of convex portions as main scattering portions disposed in each pixel area are superimposed.

What is claimed is:  
     
         1 . A liquid crystal display device comprising: a first and second electrode substrates; and a liquid crystal layer which is held between said first and second electrode substrates and whose liquid crystal molecular arrangement is divided into a plurality of pixel areas controlled by said first and second electrode substrates, 
 wherein said first electrode substrate includes a reflective plate for scattering a light incident via said second electrode substrate and said liquid crystal layer, and    said reflective plate has a reflective surface in which a first undulation formed by disposing a gradual inclined surface in each pixel area and a second undulation formed by disposing a plurality of main scattering portions in each pixel area are superimposed.    
     
     
         2 . The liquid crystal display device according to  claim 1 , wherein said first electrode substrate includes a plurality of pixel electrodes for applying a pixel potential to each corresponding pixel area, and said second undulation is disposed in the reflective surface excluding a gap between the pixel electrodes.  
     
     
         3 . The liquid crystal display device according to  claim 2 , wherein said reflective plate is constituted of said plurality of pixel electrodes.  
     
     
         4 . The liquid crystal display device according to  claim 1 , wherein said first electrode substrate includes an insulating layer as a substrate of said reflective plate.  
     
     
         5 . The liquid crystal display device according to  claim 4 , wherein said first electrode substrate includes a wiring member coated with said insulating layer, and an inclination angle of said first undulation depends on a thickness of said wiring member.  
     
     
         6 . The liquid crystal display device according to  claim 4 , wherein said first electrode substrate includes a wiring member coated with said insulating layer, and said main scattering portion is disposed in the reflective surface excluding a position above said wiring member.  
     
     
         7 . The liquid crystal display device according to  claim 4 , wherein said insulating layer includes an organic insulating layer which defines said first undulation and said second undulation.  
     
     
         8 . The liquid crystal display device according to  claim 7 , wherein said organic insulating layer is constituted of a photosensitive resin.  
     
     
         9 . The liquid crystal display device according to  claim 7 , wherein said organic insulating layer includes a laminate of a first organic insulating film which defines said first undulation and a second organic insulating film which defines said second undulation.  
     
     
         10 . The liquid crystal display device according to  claim 9 , wherein each of said first organic insulating film and said second organic insulating film is constituted of a photosensitive resin.  
     
     
         11 . The liquid crystal display device according to  claim 7 , wherein said insulating layer further includes an inorganic insulating layer as a substrate of said organic insulating layer.  
     
     
         12 . The liquid crystal display device according to  claim 11 , wherein said inorganic insulating layer includes a plurality of island portions disposed inside an outer edge of each pixel area, and an inclination angle of said first undulation depends on a thickness of said plurality of island portions.  
     
     
         13 . The liquid crystal display device according to  claim 1 , wherein each main scattering portion is a randomly disposed convex portion.  
     
     
         14 . The liquid crystal display device according to  claim 1 , wherein each main scattering portion is a randomly disposed concave portion.  
     
     
         15 . A liquid crystal display device comprising: first and second electrode substrates; and a liquid crystal layer which is held between said first and second electrode substrates and whose liquid crystal molecular arrangement is divided into a plurality of pixel areas controlled by said first and second electrode substrates, 
 wherein said first electrode substrate includes an area in which a reflective plate for scattering a light incident via said second electrode substrate and said liquid crystal layer is formed and which has a reflection function, and an area having a transmission function for transmitting the light incident via said first electrode substrate, and    said reflective plate has a reflective surface in which a first undulation formed by disposing a gradual inclined surface in each pixel area and a second undulation formed by disposing a plurality of main scattering portions in each pixel area are superimposed.    
     
     
         16 . The liquid crystal display device according to  claim 15 , wherein the area having said transmission function has a hole for transmission in said reflective plate.  
     
     
         17 . The liquid crystal display device according to  claim 15 , wherein an area having said transmission function has a plurality of transparent electrodes for applying a pixel potential to each corresponding pixel area.  
     
     
         18 . The liquid crystal display device according to  claim 17 , wherein said transparent electrode is disposed on an insulating layer having concave/convex.  
     
     
         19 . The liquid crystal display device according to  claim 18 , wherein said insulating layer includes an organic insulating layer which defines said first undulation and said second undulation.  
     
     
         20 . The liquid crystal display device according to  claim 19 , wherein said organic insulating layer is constituted of a photosensitive resin.  
     
     
         21 . The liquid crystal display device according to  claim 17 , wherein said transparent electrode is disposed on a flatted insulating layer.  
     
     
         22 . The liquid crystal display device according to  claim 21 , wherein said insulating layer includes an organic insulating layer, and an inorganic insulating layer as a substrate of the organic insulating layer, and 
 said transparent electrode is disposed on the inorganic insulating layer.