Backlight Module with Switchable Light Emitting Angles
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Solution Overview
Problem
Conventional display apparatuses with wide viewing angles pose a risk of confidential information leakage, as they do not offer convenient switching between anti-peep and sharing modes, compromising operational convenience and security.
Innovation Solution
A backlight module with a light guide member, first and second light sources, and optical microstructures that allow for adjustable light-emitting angles, enabling switching between anti-peep and sharing modes by controlling the emission of light beams through the reflection of light by microstructures, ensuring secure and convenient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light control film is placed in front of the display panel to achieve anti-peep effect, then confidential information security is improved, but operation convenience deteriorates due to manual removal requirement
Solution Approach 1:
The patent applies dynamics by making the light control film switchable between different states. The film can be automatically switched between anti-peep mode and normal viewing mode through integration with the display control system, eliminating the need for manual removal and addition. This dynamic switching capability resolves the contradiction by allowing the system to adapt its security level based on operational context.
Solution Approach 2:
The light control film is integrated with the display apparatus control system, enabling it to automatically switch between modes based on system commands. This self-service mechanism eliminates the need for user intervention in manually removing or adding the film, thereby improving operation convenience while maintaining information security when needed.
2Reliability
If a light control film is placed in front of the display panel, then anti-peep effect is improved, but device complexity increases due to additional components and manual operation steps
Solution Approach 1:
The patent merges the light control film with the display apparatus by integrating it into the existing display structure and control system. The film is positioned within the display module and controlled through the same control circuitry, reducing the need for separate manual operation mechanisms and thereby reducing overall device complexity despite maintaining anti-peep functionality.
Solution Approach 2:
By enabling the light control film to switch modes automatically through integration with the display control system, the patent eliminates the need for separate manual operation mechanisms. This self-service capability reduces device complexity by consolidating control functions into the existing display apparatus architecture.
3Adaptability or versatility
If the display apparatus has wide viewing angle, then multi-user viewing capability is improved, but information security deteriorates due to unauthorized viewing risk
Solution Approach 1:
The patent applies dynamics by making the viewing angle characteristics switchable. The display apparatus can dynamically adjust its light control properties to switch between wide viewing angle mode (for multi-user viewing) and narrow viewing angle mode (for information security). This resolves the contradiction by allowing the system to adapt its viewing characteristics based on security requirements.
Solution Approach 2:
The patent changes the optical parameters of the display system by integrating a light control film that can alter light transmission characteristics. By switching the film between different states, the display apparatus can change its effective viewing angle and light emission properties, thereby achieving both wide viewing angle capability and information security through parameter adjustment rather than fixed design.
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 a display apparatus with enhanced anti-peep performance and improved operational convenience by allowing adjustable light-emitting angles, effectively preventing unauthorized viewing while enabling multi-user viewing when needed.
Implementation Method 1
The first light receiving surfaces are configured to reflect the first light beam. The reflected first light beam has a first light emitting angle range. The second light receiving surfaces are configured to reflect the second light beam. The reflected second light beam has a second light emitting angle range.
Data Source
AI summary
A backlight module includes a light guide member, a first light source, a second light source, a plurality of first optical microstructures, and a plurality of second optical microstructures. The light guide member has a first light incident surface and an adjacent second light incident surface. The first light source is disposed at one side of the first light incident surface and is configured to generate a first light beam. The second light source is disposed at one side of the second light incident surface and is configured to generate a second light beam. The first and the second optical microstructures are disposed at the light guide member and are configured to reflect the first and the second light beams. The reflected first light beam has a first light emitting angle range without a normal viewing angle range. A display apparatus using the backlight module is also provided.