A slim apparatus of transferring discrete LEDs’ light into an ultra-collimated planar light source

Abstract

In this paper, we proposed a novel apparatus, which has very slim volume and can transfer light emitted from discrete LEDs into a uniform and ultra-collimated planar light source (UCPLS). This apparatus adopts the two-layer folded frame and two-stage CPC design so that thickness of the entire apparatus can be minimized; especially the feeder in the two-stage CPC design can greatly reduce the thickness of the CPC and make the light passing through the second-stage CPC become much more collimated. In addition, by side-by-side arrangement, a large-sized UCPLS can also be obtained. In our embodiment with an emitting area of the upper LGP of 280 mmX80 mm and a LED with optical flux of 8 lumens used as the light source, the performance according to the related simulation results shows as follows: angular FWHM of the resultant light emitted from the apparatus in the vertical and horizontal is 4.87 degrees and 24 degrees, respectively; spatial uniformity and total energy efficiency reach 84% and 69%, respectively; the average head-on luminance reaches up 5600 nit, yet this apparatus consumes just 60 mW. Furthermore, the results also demonstrate this design has potential to be applied to the product of 23 inches above while thickness of the entire apparatus is only 2.2 mm.

Organic Polarized Light‐Emitting Transistors

“…This DOP is the highest in reported organic and inorganic materials (Table S2, Supporting Information). [ 51–55 ] As demonstrated by the electroluminescence intensity of DPA‐OPLET vs gate voltage at the polarization angle of 0°, the electroluminescence intensity ( Figure a), as well as the channel current, can be significantly modulated by gate voltage in the OPLET device. The same trend of periodic variation between electroluminescence intensity and polarization angle can be observed for DPA‐OPLET at different gate voltages (Figure 4b).…”

Planar waveguide LED illuminator with controlled directionality and divergence

“…For high optical efficiency the design must conserve étendue. Approaches to solving similar problems have recently been proposed [10,11]. Our approach was to first collimate the source, allowing a tradeoff between divergence and spatial power density, and then perform a space-variant aperture transformation to interface with the thin waveguide.…”

Dual-view angle backlight module design

“…The typical edge-lit backlight module consists of the light sources, a light guide plate (LGP), and some type of optical sheet, such as a reflection sheet, a diffusion sheet, or two cross prism sheets [1,2]. With the aim of reducing the thickness and increasing the brightness life time of the LCD, many researchers put their efforts into the development of integrated LGPs [3][4][5][6][7][8][9]. The design of the microstructure of the integrated LGP and film affects the angular luminance distribution and light efficiency in the backlight module of the LCD [10][11][12][13][14][15][16].…”