Auxiliary Structure for 3D Display Backlight Assembly
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Solution Overview
Problem
The assembly of a 3D display apparatus with a directional backlight unit poses challenges in maintaining total internal reflection on the light-guide plate while integrating the switch panel module, leading to potential optical losses and size constraints.
Innovation Solution
The solution involves a directional backlight unit with a light-guide plate, an array of diffraction lattice elements, and an input coupler with an inclined mirror surface, coupled with an auxiliary structure that assembles the switch panel module and backlight unit without affecting total internal reflection, using adhesives to secure the components and minimize optical losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the switch panel module is assembled directly to the light-guide plate, then the assembly process is simplified, but total internal reflection on the light-guide plate is affected causing optical losses
Solution Approach 1:
An auxiliary structure is introduced as an intermediary component between the light-guide plate and the switch panel module. This auxiliary structure includes a first surface that contacts the light-guide plate and a second surface that contacts the switch panel module, enabling assembly without direct contact between the panel module and light-guide plate, thus preserving total internal reflection while facilitating assembly.
2Stability of the object's composition
If the assembly location is positioned within the light path of the light-guide plate, then the structural integration is improved, but optical interference occurs during assembly
Solution Approach 1:
The auxiliary structure extends in a direction perpendicular to the light path of the light-guide plate, allowing the switch panel module to be assembled on the side surface rather than within the light path. This dimensional relocation maintains structural integration while avoiding optical interference during the assembly process.
3Volume of moving object
If the directional backlight unit is designed with compact dimensions, then the overall device size is reduced, but the assembly precision requirements increase
Solution Approach 1:
The auxiliary structure serves as a positioning intermediary that includes specific contact surfaces and bonding areas, enabling precise alignment and assembly of the switch panel module relative to the light-guide plate. This mediator structure provides reference surfaces that facilitate accurate positioning, reducing assembly precision requirements despite compact device dimensions.
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
This approach enables the assembly of a high-resolution 3D image display with reduced crosstalk and optical losses, allowing for a compact design by positioning the assembly location outside the light-guide plate's light path and preventing optical interference during the assembly process.
Implementation Method 1
a light-guide plate configured to guide light from the light source through total internal reflection
Implementation Method 2
The input coupler may include an inclined mirror surface inclined with respect to the upper surface of the light-guide plate so as to input the light from the light source to the light-guide plate by reflecting the light from the light source
Implementation Method 3
The inclined mirror surface of the input coupler and the inclined surface of the auxiliary structure may bonding-coupled by an adhesive
Data Source
AI summary
A display apparatus including a directional backlight unit and a method of assembling the display apparatus are disclosed. The display apparatus includes an auxiliary structure coupled to an input coupler and a switch panel module.