3D Display Using Complementary Multiband Bandpass Filters and Dynamic Scanning Backlight

Abstract

A 3D display system with Complementary Multiband Bandpass Filter (CMBF) and dynamic scanning backlight is introduced in this paper. Unlike the traditional 3D display devices with active shutter glasses, our prototype with CMBF solves the problem of screen flicker to a certain extent. The display system comprises a pair of glasses with two thin Nb2O5–SiO2 dielectric films, a dynamic scanning backlight, and a 120 Hz Liquid Crystal Display (LCD) panel. One optical lens is picking up one set of wavelengths, while the other one is picking up the other one and blocking the first one out. The dynamic scanning backlight consists of five white LED plates. We mount 2*R*C (Row*Column) white LEDs on each aluminum substrate. Half of the LEDs are covered with the same CMBF as what is on the left side of the glasses, and the others are covered with the same one as what is on the right side of the glasses. The dynamic scanning backlight can scan in real-time and keep in pace with the refreshing of the LCD. The system has two working modes. When the prototype is in spectrum-multiplexed mode, the crosstalk is about 1.9% (Left) and 3.2% (Right). In time-multiplexed mode, the crosstalk is about 1%, just next to that of a commercial display (BENQ XL2707-B). Additionally, our display system is compatible with active shutter glasses and it has no resolution loss in 3D mode.