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

Yanzhuo Hu; Lunze Hu; Liujun Yuan; Enguo Chen; Sheng Xu; Tailiang Guo; Yun Ye

doi:10.1117/12.2689049

28 November 2023 Design of microstructure optical film for high uniform mini-LED backlight

Yanzhuo Hu, Lunze Hu, Liujun Yuan, Enguo Chen, Sheng Xu, Tailiang Guo, Yun Ye

Proceedings Volume 12765, Optical Design and Testing XIII; 127650B (2023) https://doi.org/10.1117/12.2689049
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Abstract

In recent years, Mini-LED has been widely used in direct-lit backlight for Liquid Crystal Display (LCD) widely due to its advantages of miniaturization and low power consumption. Typical Mini-LED direct-lit backlights mainly rely on the diffuser plate to convert point-like light sources into uniform surface light sources. However, the diffuser plate cannot achieve high uniformity at a very low optical distance (OD). In this paper, we introduced the pyramidal microstructure and the semi-cylindrical microstructure to both sides of the optical film, respectively. The mechanism of influence of the pyramidal microstructure and the semi-cylindrical microstructure on light was analyzed. We clarified the relationship between the parameters of the microstructure (the pyramid angle, the pyramid dimension) and the illuminance uniformity by simulation. Moreover, two layers of microstructure optical films are discussed and simulated. Through the simulation, the optical effects are evaluated and analyzed from the point of illuminance uniformity. Simulation results maintain that when the OD is 5mm, the illuminance uniformity reaches 93.07%. Compared with the diffuser plate with a thickness of 1.5mm, the thickness is reduced by 0.9mm, and the illuminance uniformity is increased by 11.77%. This work fully demonstrates the advantages of the microstructure optical film to improve the illuminance uniformity.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yanzhuo Hu, Lunze Hu, Liujun Yuan, Enguo Chen, Sheng Xu, Tailiang Guo, and Yun Ye "Design of microstructure optical film for high uniform mini-LED backlight", Proc. SPIE 12765, Optical Design and Testing XIII, 127650B (28 November 2023); https://doi.org/10.1117/12.2689049

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available