High directional backlight using an integrated light guide plate

Abstract

A high directional backlight system that combined a composite microstructure light guide plate (LGP) with a collimated light source was proposed for eco-displays. The collimated planar light was expanded from a point light source and guided towards the normal direction by utilizing the micro-prism array on LGP. High uniformity of spatial luminous, 91%, with a narrow viewing cone of ± 4° can be achieved without additional optical films. Moreover, compared to the conventional backlight, only 5% of power consumption was needed to keep the same luminance, hence, the optical efficiency increased by a factor of 1.47.

Motion‐blur‐free LCD for high‐resolution virtual reality displays

“…To widen the viewing angle of an LCD, compensation films together with a directional backlight and a weak diffusive film can be employed . In our simulation, we used the compensation scheme proposed by Ge et al .…”

“…18 To widen the viewing angle of an LCD, compensation films together with a directional backlight and a weak diffusive film can be employed. 19,20 In our simulation, we used the compensation scheme proposed by Ge et al 21 The phase retardation from the LC layer is partially compensated by a negative C-plate, and the residual phase retardation is compensated by a biaxial film. The parameters of the negative C-plate and biaxial plate are as follows: n e, C = 1.5902, n o,C = 1.5866, n x,B = 1.5028, n y,B = 1.5000, n z, B = 1.5018, d C = 21.4 μm, and d B = 74.0 μm.…”

Design of Low-Glared LED Rear Light of Automotive for EU ECE Regulation by Use of Optimized Micro-Prisms Array

“…In consequence, the conventional LED conspicuous automotive light typically causes glare to night drivers, which elevates the danger of traffic. In order to solve the above problems, several new design ideas for car signal lights have been proposed [6][7][8][9]. For example, the indirect light installed with a micro-prism sheet and LED [1][2][3][4][5][6], which is more promising and has been used to construct an automotive rear light with an attractive pattern, as shown in Figure 1b, not only providing a smooth lighting surface, flexibility of shape, but also reducing the amount of LEDs used [10][11][12][13].…”

Diffraction Gratings for Uniform Light Extraction from Light Guides

“…On the other hand, diffractive optical components offer an alternative approach for light extraction from the LGP at uniform intensity and viewing angle. Among numerous different grating geometries, which have been employed by various authors to attain uniform extraction, submicron diffraction gratings have been identified as the most promising technique [3]- [5].…”