Peep-Proof Light Source Module for Privacy Display Mode
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Solution Overview
Problem
Current display devices with privacy functions suffer from reduced image brightness and quality due to the limitations of existing peep-proof technologies, such as louvre structures and liquid crystal viewing angle switchers, which either darken or whiten the image, affecting aesthetics and contrast.
Innovation Solution
A display device with a peep-proof light source module that includes light emitting elements and optical microstructures on a light guide plate, allowing for switching between privacy and normal display modes by controlling the light-exiting angles and distribution of privacy light to maintain image quality while providing privacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a peep-proof optical sheet with ultra-fine louvre structures is added to mask large-angle light beams, then privacy is improved, but image brightness and sharpness deteriorate
Solution Approach 1:
The invention segments the backlight into two independent parts: a display beam from the backlight module for normal viewing, and a privacy light from separate light emitting elements for privacy protection. This segmentation allows each light source to perform its specific function without compromising the other, resolving the contradiction between privacy and image brightness.
Solution Approach 2:
The light guide plate acts as an intermediary that guides both the display beam and privacy light through its internal structure. The optical microstructures on the light guide plate selectively direct the privacy light at specific angles to block side viewing, while allowing the display beam to pass through for normal viewing, thus protecting privacy without reducing image brightness.
2Reliability
If a peep-proof optical sheet with ultra-fine louvre structures is added to mask large-angle light beams, then privacy is improved, but image sharpness deteriorates
Solution Approach 1:
By segmenting the lighting system into separate display and privacy functions with independent light sources, the invention avoids using the louvre structure that degrades image sharpness. The privacy light is emitted from specific angles through optical microstructures, which does not interfere with the clarity of the display image.
3Reliability
If a liquid crystal viewing angle switcher is added to change polarization state for privacy, then privacy is improved, but image contrast and display quality deteriorate
Solution Approach 1:
The invention uses separate light emitting elements dedicated to privacy light, independent of the display beam and liquid crystal layers. This segmentation eliminates the need for liquid crystal viewing angle switchers that degrade image contrast, while still achieving privacy protection through angularly selective light emission.
4Reliability
If a peep-proof optical module is added to achieve privacy function, then device complexity increases, but the invention reduces complexity through integrated design
Solution Approach 1:
The invention merges the privacy light source with the existing backlight structure by integrating light emitting elements into the light guide plate. This unified design eliminates the need for separate peep-proof optical modules, reducing overall device complexity while maintaining effective privacy protection.
Solution Approach 2:
The light guide plate serves multiple functions: it guides the display beam from the backlight module, guides the privacy light from the light emitting elements, and uses its optical microstructures to control the viewing angles of the privacy light. This multi-functionality reduces the need for additional components, simplifying the overall device structure.
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 device achieves effective privacy by ensuring onlookers see a bright, all-white image at large viewing angles without affecting the front viewer's image quality, as the privacy light exits at angles that do not include the front viewing angle, thus maintaining high image brightness and contrast.
Implementation Method 1
through the configuration of the optical microstructures of the peep-proof light source module, the display device in the privacy display mode, at least part of the privacy light to suffer total internal reflection at the optical surface and then exit the light guide plate at a large viewing angle
Data Source
AI summary
A display device, including a display module and a peep-proof light source module, is provided. The display module is used to provide a display beam. The peep-proof light source module is disposed on a transmission path of the display beam and includes at least one light emitting element, a light guide plate, and optical microstructures. The light emitting element is used to provide a privacy light. The light guide plate has at least one light incident surface. Each optical microstructure has an optical surface facing the light incident surface. At least part of the privacy light is reflected by the optical surface and then exits the light guide plate. The distribution density of the optical microstructures on the light guide plate close to the light incident surface is substantially the same as the distribution density away from the light incident surface and close to the center.