We have developed a 17.3-inch 8K wide color gamut in-plane switching LCD (IPS-LCD) with a polarized laser backlight. By applying a zero–zero-birefringence polymer, the polarized laser backlight emits polarized light with 88% polarization. We adapted the double light guide plate laser backlight to achieve uniform luminance. The developed IPS-LCD achieves a wide color gamut with high efficiency. The speckle problem was solved by applying an AC voltage to the laser diodes. In addition, the double light guide plates effectively suppress the speckle as the light is uniformly mixed in the light guide plate.
A BT.2020 wide color gamut is obtained using a laser backlight liquid crystal display (LCD). A conventional side-edge laser backlight requires a wide bezel area to achieve uniform brightness. We developed stacked double light guide plates, with each plate comprising light-mixing and light-emitting areas. The light-mixing area of each plate overlaps the light-emitting area of another light guide plate, thereby reducing the bezel width from 150 to 15 mm for a 17-inch LCD.
The International Telecommunication Union Radiocommunication Sector (ITU-R) Recommendation BT.2020 was standardized for ultra-high definition television (UHDTV). The BT.2020 specifications are 8K resolutions, a wide color gamut, and 120-Hz driving. The BT.2020 color gamut is defined from the three primary monochrome colors. Therefore, changing the light source of the backlight from conventional light-emitting diodes (LEDs) to lasers is necessary. We succeeded in prototyping a 17-inch 8K liquid crystal display (LCD) that satisfies the BT.2020 specifications. The pixel density of the 17-inch 8K display is 510 ppi, and the color gamut covers 97% of BT.2020. The liquid crystal response time is 5 ms, which is sufficient for the 120-Hz driving. To achieve the above-mentioned specifications, we developed the following technologies. To expand the color gamut, an RGB laser backlight was used. A backlight with conventional LEDs as light sources only covered 52% of BT.2020. To reduce response time, we applied a faster in-plane switching LCD (IPS-LCD) named short-range lurch control (SLC) IPS-LCD. We succeeded in realizing a blur-free display using the SLC IPS.
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