Liquid crystal display device

1. A liquid crystal display device comprising a display panel including a plurality of pixel regions arranged in matrix on a substrate, a plurality of transistors formed for each pixel region, 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, a storage capacitor wherein one electrode is connected to a second electrode of said transistor, a storage capacitor line for connecting the other electrode of said storage capacitor, and a liquid crystal layer arranged between one electrode of said pixel region connected to the second electrode of said transistor and the other electrode opposing to the electrode, wherein:

said storage capacitor is connected to a gate line of the former stage and has the Cs-on-gate structure wherein a storage capacitor is superimposed on the gate line;

a reflection portion and transmission portion are arranged in each of said pixel regions; and

a reflectance of light by the reflection portion of a selected pixel is 1% or more and 30% or less of the light incident thereon for defining an entire display signal range from a lowest value to highest value, and a transmittance of light by the transmission portion of a selected pixel is at most 4% or more and 10% or less of the light incident thereon for defining an entire display signal range from a lowest value to highest value;

wherein the liquid crystal display device includes a polarization plate and further wherein a polarity of a counter potential is inverted for every horizontal scanning period, the display having a resolution of at least 200 ppi, and further wherein the reflection portion extends perpendicularly above a CS formation region, and the reflection portion of each pixel is substantially centrally located over at least one conductive member located at a single outer side edge of the transmission portion and extending substantially along an entire length of the outer side edge of the transmission portion such that each of a plurality of adjacent pixels have corresponding reflective portions with common boundary regions, wherein light amount of the display light is 20 cd/m 2 or more and 2000 cd/m 2 or less under a condition that irradiation of light of a light source is 500 cd/m 2 or on said display panel, and said transistor is a thin film transistor having a semiconductor layer of low temperature polycrystalline silicon, an area of each transmission region is 40% or more of said entire pixel region and an area of each reflection region is 1% or more and 60% or less of said entire pixel region, and further wherein an aperture ratio of each transmission region is 40% or more and less than 100% of said entire pixel region in said pixel region.

2. A liquid crystal display device as set forth in claim 1 , wherein light amount of the display light is 20 cd/m 2 or more and 1000 cd/m 2 or less under a condition that irradiation of a light of an ambient light is 2000 lx or more and 50000 lx or less on said display panel.

3. A liquid crystal display device as set forth in claim 1 , wherein each reflection region is formed by a metal film having a high reflectance.

4. A liquid crystal display device as set forth in claim 1 , wherein each of said reflection regions is formed in a region just above any one of an interconnect region of said gate line, an interconnect region of said data signal line, an interconnect region of said storage capacitor line, and a formation region of said transistor, or a region obtained by combining a plurality of the regions.

5. A liquid crystal display device as set forth in claim 1 , comprising a selector switch for performing time-sharing driving on said signal lines.