Jang-Doo Lee

7.3: Auto-Stereoscopic Swing 3D Display

We have developed auto-stereoscopic swing 3D display for the first time in the world. It makes us to feel stereoscopically the images of portrait and landscape mode simultaneously by rotating the display. We have designed a black and white liquid crystal display as parallax barrier so that it is convertible electrically between 2D and 3D mode. We have used 2.2″ QVGA AM TFT LCD as 2D imager for mobile application. To improve 3D image quality we have designed and developed the various patterns of liquid crystal barrier and to improve 3D brightness we have designed and developed the new backlight schemes of LCD module.

A study on the optimum curvature for the curved monitor

Curved displays have been actively developed beyond the limits of the conventional flat displays. The curved displays are known to be advantageous for immersion, preferences, and viewing convenience. As such, it is necessary to conduct ergonomic studies on the curvature of the curved display. In this study, experiments were conducted to determine the optimal curvature of the curved display for six kinds of contents. The results of the experiments showed that the optimal curvature is 560.9 mm at the standard viewing distance of 600 mm, which can be considered an evidence that there is an intriguing correlation between the viewing distance and the display curvature. It is expected that the results of this study would improve the existing display products and would provide ergonomic guidelines for the users.

New RGB primary for various multimedia systems

Color gamut is one of the most important performance indicators of multimedia systems because a wide color gamut enables the reproduction of more real surface colors. The color gamut of multimedia systems depends on the RGB (red-green-blue) primary. There are various RGB primaries, such as ITU-R BT.709, ITU-R BT.2020, sRGB, Adobe RGB, and DCI-P3. ITU-R BT.709 and sRGB have a very small color gamut, while ITU-R BT.2020 has an extremely wide one. Adobe RGB and DCI-P3 have RGB primaries with the characteristics of color printers and digital cinema projectors, respectively. Also, some of these RGB primaries are not compatible with each other. Thus, the contents of a system should be converted for use in other systems. This paper proposes an RGB primary for use in various multimedia systems. In the proposed method, sRGB, Adobe RGB, and DCI-P3 – the most frequently used RGB primaries – are unified. In this paper, the color gamut efficiency and human visual preference of the proposed RGB primary are checked. The proposed RGB primary is expected to be utilized as an international-standard RGB primary for multimedia systems.

P‐50: 42‐inch PDP Autostereoscopic 3D Display

We have made a 42-inch PDP autostereoscopic three-dimensional display. A sheet of lenticular lens is placed in front of a 42-inch PDP of full color XGA. The surface temperature of a PDP can be high during its operating times. The pitch of lenticular lens may be expanded. It makes an undesirable problem of deteriorating the 3D image quality. To overcome this problem, we have developed a 3D simulator to design a lenticular lens properly and measured the thermal expansion ratio of the lenticular lens and the surface temperature of the PDP. These two measured values have been used in the design of lenticular lens.

The crease perception in flexible display

There is a growing possibility applied to the foldable display for mobile devices because consumers want to see the big screen and they prefer mobile devices easy to carry around. However, a foldable display has crease because it generally uses laminated films or plastic substrates. In this study, we conducted the experiments in which people perceive crease on the flexible display for the various display viewing environments. The result shows that subjects most easily perceived crease in a bright room and panel off-state when the folding radius is 5 mm (5R). They perceived crease at an average height of 143 µm in that condition. The subjects perceived crease at an average height of 185.5 µm in the outdoor with display off condition. Also we analyzed that the subjects perceived the crease better when the folding radius of the flexible display was smaller than 5R. We expect that this study will contribute to the standardization of the new assessment method and to setting perception standards for the flexible display.