Light Source Module with Lenticular Lens Structures for Anti-Spy Display
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Solution Overview
Problem
Current anti-spy technologies in liquid crystal displays, such as anti-spy films and liquid crystal orientation methods, compromise display brightness and sharpness, and are inconvenient to use, while also failing to provide a satisfactory anti-spy effect.
Innovation Solution
A light source module comprising a first and second light guide plate, a first and second light source, and a turning film with lenticular lens structures, which reduces the light divergence angle, allowing for an anti-spy effect that can be selectively enabled or disabled.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If anti-spy film is added to shield large angular beam, then anti-spy effect is improved, but display brightness and sharpness are reduced
Solution Approach 1:
The invention divides the light guide plate into multiple regions with different light extraction characteristics. The first light guide plate has a first light extraction surface that extracts light in a first direction, while the second light guide plate has a second light extraction surface that extracts light in a second direction different from the first direction. This segmentation allows different parts of the display to have different viewing angle characteristics, achieving anti-spy effect in certain directions while maintaining brightness in others.
Solution Approach 2:
Different regions of the light guide plate are given different optical properties. The first light extraction surface and second light extraction surface have different light extraction directions and characteristics. This local differentiation enables the display to provide anti-spy functionality in specific viewing angles while maintaining normal display quality in other angles, avoiding the need to compromise overall brightness.
2Object-affected harmful factors
If anti-spy film is added, then anti-spy effect is improved, but display sharpness is reduced
Solution Approach 1:
The light guide plate is segmented into multiple light extraction surfaces with different orientations. This segmentation allows the display to control light distribution in different directions without using anti-spy film, thereby maintaining display sharpness while achieving anti-spy effect through optical design rather than physical filtration.
3Object-affected harmful factors
If liquid crystal molecules are controlled to have different inclination angles in different display areas, then anti-spy effect is achieved, but manufacturing process becomes more difficult
Solution Approach 1:
Instead of controlling liquid crystal molecules at the microscopic level, the invention segments the light guide plate into macroscopic regions with different light extraction surfaces. This approach achieves anti-spy effect through structural segmentation rather than molecular control, significantly simplifying the manufacturing process while maintaining the desired optical functionality.
Solution Approach 2:
The invention replaces the complex mechanical control of liquid crystal molecule orientations with a simpler optical system using light guide plates with different light extraction surfaces. This substitution eliminates the need for precise molecular alignment while achieving the same anti-spy effect through geometric optics.
4Object-affected harmful factors
If VA liquid crystal optical properties are utilized to produce anti-spy pattern, then anti-spy pattern is created, but display brightness is reduced and anti-spy effect is incomplete
Solution Approach 1:
The invention uses multiple light guide plates with different light extraction surfaces to create anti-spy effect through geometric optics rather than relying on VA liquid crystal patterns. This approach maintains display brightness by using structural light control instead of manipulating liquid crystal optical properties, avoiding the brightness reduction and incomplete shielding associated with VA patterns.
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 provides an anti-spy effect by reducing light divergence, maintaining display brightness, and allowing users to optionally enable or disable the anti-spy mode for convenience, while ensuring privacy protection.
Implementation Method 1
The first light guide plate includes a first light exiting surface, the first light exiting surface is located at a side of the first light guide plate facing the turning film and has a plurality of lenticular lens structures
Implementation Method 2
The turning film has a plurality of prism columns, the prism columns face the second light guide plate
Data Source
AI summary
A light source module including a first light guide plate, a first light source, a second light guide plate, a second light source, and a turning film is provided. The first light guide plate and the second light guide plate are sequentially stacked up. The second light guide plate is disposed between the first light guide plate and the turning film. The turning film has a plurality of prism columns, the prism columns face the second light guide plate. The first light guide plate includes a first light exiting surface, the first light exiting surface is located at a side facing the turning film and has a plurality of lenticular lens structures. The lenticular lens structures are arranged along a first direction and extended along a second direction perpendicular to the first direction. Besides, a display apparatus is also provided.