Backlight Unit Light Guiding Plates for Field Sequential Display

The light guiding plate is divided into multiple independent light guiding regions (first, second, third regions) corresponding to different display areas. Each region has its own LED lamp that can be controlled independently, allowing selective illumination of specific regions during sequential driving, thereby preventing light from spreading to adjacent regions that should remain dark.

Different regions of the light guiding plate are given different optical properties through localized structures. Reflective patterns are formed only in specific regions (e.g., first and third regions) while other regions (e.g., second region) have different reflectivity characteristics. This creates local optical quality differences that guide light behavior specifically in each region, preventing cross-region light leakage.

Instead of using a single continuous LED array, the patent segments the illumination system into multiple independent LED lamps positioned at different locations. Each LED lamp illuminates a specific light guiding region, providing localized uniform luminance without causing light to spread into adjacent regions that should remain dark during their off-periods.

Reflective patterns are selectively formed in specific regions of the light guiding plate to control light distribution locally. These patterns ensure uniform luminance in illuminated regions while preventing light from leaking into adjacent regions, achieving both uniformity and isolation simultaneously.