Liquid crystal display apparatus

Abstract

A liquid crystal display able to deal with high definition display and able to secure both of a transmission type display luminance and a reflection type display luminance, wherein light from backlights 71 a and 71 b are focused by a lens sheet 74 , luminance of the backlights is improved, a transmittance can be set at 4 percent to 10 percent, a reflectance can be set in a range from 1 percent to 25 percent, and high definition display is handled while securing a display light luminance equivalent to that of a liquid crystal display performing only transmission type display and a reflection display light luminance required for the display without increasing a power consumption of the backlights.

1 . A liquid crystal display provided with a display panel having a pixel region in which a reflection region for display by ambient light introduced from the outside and a transmission region for display by light from an internal light source are arranged in parallel, wherein 
 a reflectance of the light in said display panel by said reflection region is 1 percent to 30 percent and a transmittance of the light in said display panel by said transmission region is 4 percent to 10 percent.    
     
     
         2 . A liquid crystal display as set forth in  claim 1 , wherein said display panel is provided with a focus portion for focusing light incident upon said transmission region.  
     
     
         3 . A liquid crystal display as set forth in  claim 1 , wherein said reflection region has a function of scattering the incident light.  
     
     
         4 . A liquid crystal display as set forth in  claim 1 , wherein said reflection region has a function of regularly reflecting the incident light.  
     
     
         5 . A liquid crystal display as set forth in  claim 1 , wherein said reflection region is formed by a metal film having a high reflectance.  
     
     
         6 . A liquid crystal display as set forth in  claim 1 , wherein a color filter is provided in only said transmission region.  
     
     
         7 . A liquid crystal display as set forth in  claim 1 , wherein the color filter is formed at a location corresponding to said pixel region, and an opening is formed in said reflection region of said color filter.  
     
     
         8 . A liquid crystal display as set forth in  claim 7 , wherein said opening is formed at the approximate center of said reflection region.  
     
     
         9 . A liquid crystal display as set forth in  claim 1 , wherein, in said display panel, under conditions of irradiation of the light of said light source of 500 cd/m 2  to 25000 cd/m 2 , the amount of the display light is 20 cd/m 2  to 200 cd/m 2 .  
     
     
         10 . A liquid crystal display as set forth in  claim 1 , wherein, in said display panel, under conditions of irradiation of the light of said ambient light of 2000 lx to 50000 lx, the amount of the display light is 200 cd/m 2  to 1000 cd/m 2 .  
     
     
         11 . A liquid crystal display as set forth in  claim 1 , wherein, in said pixel region, an area of said transmission region is at least 40 percent of the overall pixel region, and the area of said reflection region is 1 percent to 60 percent of the overall pixel region.  
     
     
         12 . A liquid crystal display as set forth in  claim 1 , wherein, in said pixel region, an aperture ratio of said transmission region is 40 percent to 100 percent of the overall pixel region.  
     
     
         13 . A liquid crystal display provided with a display panel including a plurality of pixel regions arranged in a matrix on a substrate; a plurality of transistors formed for every pixel region and arranged in a matrix; a plurality of gate lines for connecting gate electrodes of the plurality of transistors; a plurality of data signal lines for connecting first electrodes of the plurality of transistors; storage capacitors having one-electrodes connected to the second electrodes of said transistors; storage capacitor lines for connecting another-electrodes of said storage capacitors; and a liquid crystal layer arranged between one-electrodes of said pixel regions connected to the second electrodes of said transistors and another-electrodes facing those electrodes, wherein 
 a reflection region and a transmission region are arranged in parallel in each pixel region,    a reflectance of the light in said display panel by said reflection region is 1 percent to 30 percent, and a transmittance of the light in said display panel by said transmission region is 4 percent to 10 percent.    
     
     
         14 . A liquid crystal display as set forth in  claim 13 , wherein said display panel is provided with a focus portion for focusing the light incident upon said transmission region.  
     
     
         15 . A liquid crystal display as set forth in  claim 13 , wherein said transistor is a thin film transistor using low temperature polycrystalline silicon as a semiconductor layer.  
     
     
         16 . A liquid crystal display as set forth in  claim 13 , wherein said reflection region has the function of scattering the incident light.  
     
     
         17 . A liquid crystal display as set forth in  claim 13 , wherein said reflection region has the function of regularly reflecting the incident light.  
     
     
         18 . A liquid crystal display as set forth in  claim 13 , wherein said reflection region is formed by a metal film having a high reflectance.  
     
     
         19 . A liquid crystal display as set forth in  claim 13 , wherein a color filter is provided in only said transmission region.  
     
     
         20 . A liquid crystal display as set forth in  claim 13 , wherein the color filter is formed at a location corresponding to said pixel region, and an opening is formed in said reflection region of said color filter.  
     
     
         21 . A liquid crystal display as set forth in  claim 20 , wherein said opening is formed at the approximate center of said reflection region.  
     
     
         22 . A liquid crystal display as set forth in  claim 13 , wherein said reflection region is formed in a region just above either one of an interconnect region of a gate line, an interconnect region of a data signal line, an interconnect region of a storage capacitor line, and a formation region of said transistors or a region obtained by combining a plurality of the regions.  
     
     
         23 . A liquid crystal display as set forth in  claim 13 , wherein said gate lines and said storage capacitor lines are separately formed.  
     
     
         24 . A liquid crystal display as set forth in  claim 13 , wherein the display has a Cs-on-gate structure where said storage capacitor is connected to the gate line of a previous stage and the storage capacitor is superimposed on the gate line.