Design of LED free form lens based on improved mesh method

Le, Nengyou; Shi, Zhiwei; Shi, Xin-gang

doi:10.1016/j.ijleo.2019.02.005

Cited by 6 publications

(3 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A collimated LED is equivalent to a point source with a very long focal length [29][30][31]. Figure 4(a) shows that the width of the light transmission area varies with the incident angle and the variations in the width of the area is bigger when the incident angle is larger.…”

Section: Scattering Model and Error Analysismentioning

confidence: 99%

A High Precision Time Grating Displacement Sensor Based on Temporal and Spatial Modulation of Light-Field

Zhu

et al. 2020

Sensors

View full text Add to dashboard Cite

A new displacement sensor with light-field modulation, named as time grating, was proposed in this study. The purpose of this study was to reduce the reliance on high-precision measurements on high-precision manufacturing. The proposed sensor uses a light source to produce an alternative light-field simultaneously for four groups of sinusoidal light transmission surfaces. Using the four orthogonally alternative light-fields as the carrier to synthesize a traveling wave signal which makes the object movement in the spatial proportion to the signal phase shift in the time, the moving displacement of the object can be measured by counting time pulses. The influence of the light-field distribution on sensor measurement error was analyzed in detail. Aimed to reduce these influences, an optimization method that used continuous cosinusoidal light transmission surfaces with spatially symmetrical distribution was proposed, and the effectiveness of this method was verified with simulations and experiments. Experimental results demonstrated that the measurement accuracy reached 0.64 µm, within the range of 500 mm, with 0.6 mm pitch. Therefore, the light-field time grating can achieve high precision measurement with a low cost and submillimeter period sensing unit.

show abstract

Section: Scattering Model and Error Analysismentioning

confidence: 99%

A High Precision Time Grating Displacement Sensor Based on Temporal and Spatial Modulation of Light-Field

Zhu

et al. 2020

Sensors

View full text Add to dashboard Cite

show abstract

“…Several optical elements and design methods for diffusing the rays from light sources have been proposed. Le et al 13 proposed a method of diffusing the light with a lens, and Sekiguchi et al 14 proposed a method of diffusing the light with diffusion particles in a diffusion film. However, both methods have some limitations when the outer diameter is small.…”

Section: Introductionmentioning

confidence: 99%

Design of microstructure optical film for high uniform mini-LED backlight

Hu,

Yuan

et al. 2023

Optical Design and Testing XIII

View full text Add to dashboard Cite

“…Several optical elements and design methods for diffusing the rays from light sources have been proposed. Le et al [1] proposed a method of diffusing rays with a lens. Sekiguchi et al [2] proposed a method of diffusing light with diffusing particles in a diffusion film.…”

Section: Introductionmentioning

confidence: 99%

P‐3.18: Design of Microstructure Optical Film for Ultra‐thin MiniLED Backlight Module

Xiao

Zeng

Wang

et al. 2022

Symp Digest of Tech Papers

View full text Add to dashboard Cite

A backlight module is a key component of a liquid crystal display(LCD). The thickness of the backlight module affects the thickness of the display. In this paper, a design method based on the segment‐weighted is proposed for the miniLED backlight, which could reduce the thickness of the backlight module while ensuring uniformity of luminance. A surface microstructure is designed by discretizing the extended light source into a point source and designing the corresponding point microstructure using the point source based design method and the segment‐weighted method. The simulation results show that the brightness uniformity is 70%. To further improve the brightness uniformity, a diffusion film is added with the optical distance(OD) of 0.8mm, and the brightness uniformity is improved to 88%. The optical film designed in this paper can effectively improve the brightness uniformity and realize the ultra‐thin performance of the backlight.

show abstract

Design of LED free form lens based on improved mesh method

Cited by 6 publications

References 13 publications

A High Precision Time Grating Displacement Sensor Based on Temporal and Spatial Modulation of Light-Field

A High Precision Time Grating Displacement Sensor Based on Temporal and Spatial Modulation of Light-Field

Design of microstructure optical film for high uniform mini-LED backlight

P‐3.18: Design of Microstructure Optical Film for Ultra‐thin MiniLED Backlight Module

Contact Info

Product

Resources

About