We have developed an 8K4K liquid-crystal display (LCD) with diagonal size of 55 inch with the backplane based on an amorphous silicon (a-Si) technology. The 8K4K-LCD has high frame frequency at 120 Hz, which is enabled by a unique technology to compensate the charging voltage of pixels. The achievement of a high resolution of 8K4K including high frame frequency of 120 Hz with a-Si backplanes is ground-breaking for LCDs. Furthermore, a backlight system with laser diode as light source expands the color gamut dramatically. This backlight system enables covering 99% of color space recommended in BT.2020. What is more, the 8K4K-LCD has evolved into a three-dimensional (3-D) display device by attaching a 3-D polarizing film. The vertical viewing angle of the 8K-3D LCD prototype is 8.6 deg at its optimal viewing position set to 1.2 m.
An 8K4K-LCD with the diagonal size of 55 inch has been developed. The backplane is based on an amorphous silicon (a-Si) technology and can operate at 120Hz, which is achieved by developing a technology to compensate the charging voltage of pixels. The realization of a high resolution of 8K4K and a high frame frequency of 120Hz is the world first for LCDs with a-Si backplanes. Moreover, a backlight system with laser light sources expands the color gamut. The newly developed LCD covers 99% of color space defined in BT.2020.
Additionally, we have established three dimensional 8K4K technology. A 3D polarization filter is attached on the 55-in. 8K4K LCD. The vertical viewing angle of 8K-3D LCD prototype is 8.6 degrees at its optimal viewing position set to 1.2m.
Viewing angle performance in in-plane switching liquid
crystal displays (IPS-LCDs) has been greatly improved, using two
technologies. One is optical compensation technology using a biaxial
film. The other is a newly developed IPS-Pro cell structure with
higher transmission efficiency. These technologies are successfully
introduced into the fabrication of 32-in. IPS-LCDs with a minimum
contrast ratio over three times that of conventional IPS-LCDs and
with color saturation (area ratio to NTSC at CIE1931 xy chromaticity
coordinates) of more than 70% at almost all viewing angles.
The viewing angle performance in IPS-LCDs has been greatly improved, by using two technologies. One is optical compensation technology using a biaxial film. The other is the newly developed IPS-Pro cell structure with its higher transmission efficiency. These technologies have been successfully introduced into the fabrication of 32-inch IPS-LCDs with a minimum contrast ratio of over three times that of the conventional and with a color saturation (area ratio to NTSC at CIE1931 xy chromaticity coordinates) of over 70 % at almost all viewing angles.
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