Light Source Module Anti-Spy Mechanism via Light Modulation
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Solution Overview
Problem
Current anti-spy technologies in liquid crystal displays, such as anti-spy films and liquid crystal inclination methods, compromise brightness and display sharpness, and are inconvenient to use, while existing technologies fail to provide a satisfactory anti-spy effect.
Innovation Solution
A light source module with a light guide plate, a light source set, and a light modulating device that includes a light reflection portion, which converges the divergence angle of the light beam emitted, providing an anti-spy effect by limiting the viewable range of the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an anti-spy film is added to shield large angular beam, then anti-spy capability is improved, but brightness and display sharpness are reduced
Solution Approach 1:
The patent extracts the anti-spy function from the display panel layer and relocates it to the light source module layer by using a light modulating device with specific refraction structures. This separation allows the anti-spy functionality to be achieved without adding anti-spy films that would reduce brightness and sharpness, as the light modulation occurs before light enters the display panel.
Solution Approach 2:
The light modulating device acts as an intermediary component between the light source and the display panel. It contains refraction structures that selectively control light propagation angles, allowing front-view light to pass through while blocking oblique-angle light. This intermediary approach achieves anti-spy capability without directly modifying the display panel or adding films that would degrade image quality.
2Object-affected harmful factors
If anti-spy film is used, then anti-spy capability is improved, but convenience is reduced due to needing to carry the film
Solution Approach 1:
The patent merges the anti-spy function with the light source module by integrating a light modulating device into the backlight assembly. This combination eliminates the need for separate, removable anti-spy films, as the anti-spy capability is permanently built into the display device's lighting system, thereby improving convenience while maintaining anti-spy protection.
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 complexity increases
Solution Approach 1:
The patent replaces the complex mechanical control of liquid crystal molecules at different positions with a passive optical structure (light modulating device with refraction structures). Instead of actively controlling liquid crystal inclination angles across different display areas, the refraction structures passively guide light at specific angles, achieving the same anti-spy effect with simpler manufacturing processes.
4Object-affected harmful factors
If VA liquid crystal optical properties are used to produce anti-spy pattern, then anti-spy capability is improved, but brightness is reduced and shielding is incomplete
Solution Approach 1:
The patent applies preliminary action by pre-structuring the light paths before light enters the display panel. The light modulating device contains refraction structures that预先 (in advance) direct light at specific angles toward the display panel, ensuring that only appropriate-angle light reaches the viewer. This preliminary light path control achieves complete shielding of oblique views while maintaining brightness, unlike VA liquid crystal methods that reduce brightness.
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 effectively enhances the anti-spy capability of display apparatuses by maintaining brightness and sharpness while restricting the angle from which the display can be viewed, thus protecting user privacy.
Implementation Method 1
The light modulating device includes a light reflection portion and is adapted to refract the first light beam
Implementation Method 2
The light modulating device includes a light reflection portion
Data Source
AI summary
A light source module including a light guide plate, a light source set and a light modulating device is provided. The light guide plate includes a light entering surface. The light source set is disposed beside the light entering surface. The light-source is adapted to emit a first light beam. The light modulating device is disposed between the light source set and the light guide plate. The light modulating device includes a light reflection portion. The first light enters the light entering surface through the light modulating device, and the light modulating device makes the divergence angle of the first light converge.