Transflective liquid crystal display device
View Patent ↗An IPS-mode transflective LCD device includes an array of pixels each including a reflective region and a transmissive region juxtaposed. The reflective region operates in a normally-white mode, and the transmissive region operates in a normally-black mode. A common data signal is supplied to the reflective region and transmissive region, whereas the common electrode signal in the transmissive region is an inverted signal of the common electrode signal in the reflective region, to thereby obtain similar gray-scale levels.
1. A transflective liquid crystal display (LCD) device comprising first and second polarizing films having polarizing axes perpendicular to one another, a liquid crystal (LC) layer interposed between said first polarizing film and said second polarizing film, said LC layer defining an array of pixels each including a reflective region and a transmissive region juxtaposed, wherein:
LC molecules of said LC layer have a longer axis extending parallel to or normal to the polarization direction of the light incident onto said LC layer in said reflective region; and
each of said pixels includes two pixel electrodes receiving a pixel signal which is common between said reflective region and said transmissive region, a first common electrode receiving a first common signal which is common among said reflective regions of a plurality of said pixels, and a second common electrode receiving a second common signal which is common among said transmissive regions of said plurality of said pixels.
2. The LCD device according to claim 1 , wherein said first common signal is substantially an inverted signal of said second common signal.
3. The LCD device according to claim 1 , wherein said pixel electrode includes a first pixel electrode in said reflective region and a second pixel electrode in said transmissive region, and each of said pixels is associated with a first switching device for coupling a data line to said first pixel electrode, and a second switching device for coupling said data line to said second pixel electrode.
4. A transflective liquid crystal display (LCD) device comprising a liquid crystal (LC) layer defining an array of pixels arranged in a matrix, each of said pixels including therein a reflective region and a transmissive region juxtaposed, wherein:
each of said pixels includes a first pixel electrode in said reflective region, and a second pixel electrode in said transmissive region;
each of said pixels is associated with a first switching device for coupling said first pixel electrode in said reflective region to a data line supplying a data signal, and a second switching device for coupling said second pixel electrode in said transmissive region electrode-and said data line, and
a first common electrode including a plurality of common electrodes connected in common and disposed in said reflective regions of a plurality of said pixels, and a second common electrode including a plurality of common electrodes connected in common and disposed in said transmissive regions ofa plurality of said pixels.
5. The LCD device according to claim 4 , wherein said first and second common electrodes are applied with voltages each obtained by inverting the other of said voltages.