Tetsushi Sato

29.3: A 1450-ppi Field-Sequential System-on-Glass LCD Capable of Operating Over a Wide Temperature Range

We succeeded in developing a field-sequential color system-on-glass (SOG) LCD with a twisted-nematic mode using a novel material and novel driving method. We achieved a 4-ms response time and operation over a wide range of temperatures with a 2.1-μm cell gap. High optical efficiency was demonstrated with an aperture ratio of 59% and a 17.5-μm pixel pitch.

A two-way multiview 3D display using a liquid crystal lens

Handheld devices universally require the capability to switch images between landscape and portrait modes, and thus a similar function is also required for 3D displays. Using a conventional pixel arrangement, however, will result in color moiré in the 3D display in at least one of the modes (landscape or portrait).1–3 To alleviate the problem, we have developed a display panel that has the following pixel arrangement: horizontal and vertical pixels time-density pixels (HV DP) (see Figure 1). Using this approach, we were able to suppress color moiré generated in the display image. In our setup, one pixel comprises 4 4 subpixels of four primary colors, which we arranged so that the colors did not overlap in either the X or Y directions. We placed each of the lens array elements at a position corresponding to each pixel, and input the viewpoint images to the respective subpixel groups H1 to H4 in the landscape, and to subpixel groups V1 to V4 in the portrait. In this arrangement, the neighboring subpixels in each pixel are different colors. The array pitches of the subpixels are uniform for two directions, and the probability of there being subpixels of different colors is the same for both directions. The result is suppression of color moiré in the display image. To test the optical characteristics of our approach, we evaluated a 4-inch HV DP panel combining an LC lens and a static lens. To enable switching between landscape and portrait lenses, the lower substrate of the LC lens is equipped with electrodes EL1 and EL2 for landscape, and the upper substrate with electrodes EL3 and EL4 for portrait (see Figure 2). The pitch of both lenses is 146.9 m. First, we measured the luminance profile of the combined 4-inch HV DP panel and static lens. The focal length of the static lens is almost the same as the distance between the lens and the pixel. We selected two-view mode and input the first viewpoint image (black or white) into H1 Figure 1. Viewing zones for an approach that uses arrangement of horizontal and vertical pixels time-density pixels (HV DP) and a twoway LC lens. H1–4, V1–4: Subpixel groups.