Research On Microstructure Processing And Optical Properties Of Edge-lit Light Guide Plates

Nowadays,people's demand for monitors is getting larger and larger,and the requirements for display effects of monitors are also getting higher and higher with the extensive use of smart phones and computers.The liquid crystal display has gradually replaced the cathode ray tube display and become the mainstream of flat panel display because of the small size,light weight,low power consumption,clear display image and full color.It is widely used in the computers,mobile phones,smart watches and other products.The liquid crystal molecules in the liquid crystal display do not emit light.Its light source is provided by the backlight module.Therefore,the illumination quality of the backlight module directly affects the display quality of the whole display.The light guide plate is the core part of the backlight module.Its function is to transform the side light source into a plane light source with uniform emission.At present,there are some problems in the light guide plate,such as low light utilization rate.It is difficult to achieve good uniformity.They restrict the luminescence quality of the backlight module.Therefore,the design of the light guide plate becomes very important in order to improve the display effect of the display.In this paper,the microstructure of the light guide plate is studied by means of laser etching with the goal of improving the uniformity of the light output and the utilization rate of light.The work of this paper mainly includes:The first chapter mainly introduces the current development status,types and components of liquid crystal displays,leads to the key light guide plates studied in this paper.The research status of the light guide plate microstructure and the optical principle,classification,and scattering dot distribution rules of the light guide plate are explained.The second chapter is the verification simulation of the scattering microstructure of laser etching light guide plate.The influence of the ring melt material(recast layer)left by laser etching on guide plate on the optical of the light guide plate is studied.The third chapter,the method of replacing a single big dot with several small dots at the same dot density is proposed to improve the utilization rate of light.Four kinds of the opticalmodels were established for simulation,and the process parameters were verified by femtosecond laser.A small backlight module is made to verify the method.The fourth chapter,the microstructure of the light guide plate's light inlet side is studied to explore its role in reducing the shadow on the light inlet side of the light guide plate.This paper analyzes the influence of the distribution of micro-structure on the light inlet side and the top angle on the shadow problem,and establishes single structure-single LED model and multi-structure-single LED model to analyze the optical properties of micro-structure in detail,and obtains the propagation rule of the light in micro-structure.Finally,the paper summarizes the shortcomings and points out the new research direction.