Anti-peep Light Source Module with Viewing Angle Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing anti-peep display devices compromise optical performance, user experience, and production yield due to high optical requirements and reduced viewing angles, leading to scattering issues and flawed image concealment.
Innovation Solution
An anti-peep light source module with a light guide plate and viewing angle switching module, featuring optical microstructures and a grating structure, which enhances illumination beam brightness and adjustability, combined with optical films for improved haze and brightness, allowing for expanded viewing angles and effective privacy protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a high optical performance architecture is used to maximize forward brightness, then optical performance is improved, but viewing angle in vertical direction is reduced
Solution Approach 1:
The backlight module is divided into multiple independent light source units, each with its own light guide plate and optical microstructures. This segmentation allows different regions to optimize for either brightness or viewing angle as needed
Solution Approach 2:
Optical microstructures are selectively applied to specific regions of the light guide plate rather than uniformly across the entire surface. This local quality approach enables forward brightness enhancement in central regions while preserving viewing angle in peripheral regions
2Illumination intensity
If a high optical performance architecture is used to maximize optical performance, then optical performance is improved, but flaw concealing property is compromised
Solution Approach 1:
Optical microstructures are selectively applied to specific regions of the light guide plate rather than uniformly across the entire surface. This local quality approach enables forward brightness enhancement in central regions while preserving viewing angle in peripheral regions
3Object-affected harmful factors
If liquid crystal panels are used for both liquid crystal display and electronically controlled liquid crystal viewing angle switch, then anti-peep function is achieved, but transmissivity is significantly reduced
Solution Approach 1:
The viewing angle control function is extracted from the liquid crystal panel and implemented separately through optical microstructures on the light guide plate. This separates the privacy protection function from the display function, allowing the liquid crystal panel to focus on image display with high transmissivity while the optical microstructures provide viewing angle control
Solution Approach 2:
Optical microstructures serve as an intermediary element between the light source and the liquid crystal panel. These microstructures control the viewing angle of backlight without interfering with the liquid crystal panel's transmissivity and image display functions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves favorable optical performance, user experience, and production yield by expanding the viewing angle range while maintaining high brightness and effective privacy protection, balancing optical performance and user experience.
Implementation Method 1
The LGP has a plurality of optical microstructures on a first surface of the LGP, the light beam leaves a second surface of the LGP through optical surfaces of the optical microstructures of the LGP and generates an illumination beam
Implementation Method 2
The LGP has a plurality of optical microstructures on a first surface of the LGP, the light beam leaves a second surface of the LGP through optical surfaces of the optical microstructures of the LGP and generates an illumination beam
Implementation Method 3
The viewing angle limiting element has a grating structure, where an included angle between an extension direction of the grating structure and the first direction is within a range from 88 degrees to 92 degrees
Data Source
AI summary
An anti-peep light source module includes a light source module and a viewing angle switching module. The light source module has a light source and a light guide plate (LGP) and has light emitting elements arranged along a first direction. The viewing angle switching module is located on a transmission path of an illumination beam of the light source module and includes a viewing angle limiting element and a viewing angle adjusting element configured to change a viewing angle of the illumination beam. The viewing angle limiting element has a grating structure and is located between the viewing angle adjusting element and the light source module. an included angle between an extension direction of the grating structure and the first direction is within a range from 88 degrees to 92 degrees. The anti-peep light source module and A display device achieve favorable optical performance, user experience, and production yield.