Backlight Module Asymmetric Viewing Angle Control
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Solution Overview
Problem
Existing passive viewing angle adjustment light control technologies, such as louver films, suffer from light loss due to the use of light-shielding structures, and struggle to achieve asymmetric viewing angle deflection effectively.
Innovation Solution
A backlight module comprising a light source, a first prism sheet, and a light type adjustment sheet, which uses the refraction of light to adjust the viewing angle without a light-shielding structure, thereby minimizing light loss and achieving asymmetric viewing angle deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a louver film with a light-shielding structure is used to control viewing angle, then the viewing angle can be adjusted and limited within a certain range, but light loss occurs due to blocking and absorption of light beams
Solution Approach 1:
The patent replaces the mechanical light-shielding structure of louver films with an optical refraction system consisting of a prism sheet and a light type adjustment sheet. The prism sheet refracts light at specific angles, and the light type adjustment sheet with asymmetric structures further controls the light distribution, achieving viewing angle control through optical refraction rather than mechanical blocking, thereby eliminating light loss from absorption and blocking.
Solution Approach 2:
The patent changes the optical parameters of the light control system by using materials with specific refraction indices and designing structures with specific geometric parameters. The prism sheet has a defined refraction angle, and the light type adjustment sheet has asymmetric structures with specific angles and dimensions, allowing precise control of light distribution and viewing angles without the need for light-shielding structures.
2Adaptability or versatility
If a louver film with a special light-shielding structure is used to achieve asymmetric viewing angle deflection, then asymmetric viewing angle can be achieved, but light loss increases due to blocking and absorption
Solution Approach 1:
The patent applies asymmetry by designing the light type adjustment sheet with asymmetric structures that have different geometric parameters on different sides. The asymmetric structures have different angles and dimensions, causing light to be refracted and distributed asymmetrically, achieving asymmetric viewing angle deflection without requiring asymmetric light-shielding structures that would cause light loss.
Solution Approach 2:
The patent replaces the asymmetric light-shielding structure with an asymmetric optical refraction system. The combination of the prism sheet and the asymmetric light type adjustment sheet creates asymmetric light distribution through refraction, achieving the desired asymmetric viewing angle deflection without the light loss associated with blocking and absorption by asymmetric light-shielding structures.
3Ease of operation
If a light-shielding structure is used to control light direction, then viewing angle adjustment is achieved, but chromaticity shift occurs due to selective absorption
Solution Approach 1:
The patent replaces the light-shielding structure that causes selective absorption and chromaticity shift with an optical refraction system. The prism sheet and light type adjustment sheet control light direction through refraction, which is a wavelength-independent process, thereby maintaining chromaticity consistency while achieving effective light direction control and viewing angle adjustment.
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 proposed solution effectively adjusts the viewing angle while maintaining brightness and minimizing chromaticity shift, thus overcoming the limitations of traditional light control technologies.
Implementation Method 1
uses the refraction of the light beam to achieve the purpose of adjusting the viewing angle
Data Source
AI summary
A backlight module includes a light source, a first prism sheet disposed on the light source, and a light type adjustment sheet disposed on a side of the first prism sheet away from the light source and including a base and multiple light type adjustment structures. The multiple light type adjustment structures are disposed on the first surface of the base. Each light type adjustment structure has a first structure surface and a second structure surface connected to each other. The first structure surface of each light type adjustment structure and the first surface of the base form a first base angle therebetween, and the second structure surface of each light type adjustment structure and the first surface of the base form a second base angle therebetween. The angle of the first base angle is different from the angle of the second base angle.