Backlight Unit 3D Light Guide Plate Cost Reduction
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Solution Overview
Problem
The high manufacturing cost of 3D light controllers with liquid crystal layers in autostereoscopic 3D display devices is a significant challenge, as they are essential for displaying 3D images by controlling light from pixels.
Innovation Solution
A backlight unit comprising a 3D light guide plate with first light output patterns, such as line prism patterns, and a 2D light guide plate, which function as the 3D light controller, eliminating the need for a separate 3D light controller with a liquid crystal layer by using first and second light sources to emit light only through specific patterns, thereby creating viewing zones for 3D image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a 3D light controller with liquid crystal layer is used, then 3D image display capability is achieved, but manufacturing cost increases
Solution Approach 1:
The patent merges the 3D light controller functionality directly into the backlight unit by integrating a 3D light guide plate with specific light output patterns (such as lens arrays or prism patterns) and light sources. This integration eliminates the need for a separate liquid crystal layer-based 3D light controller, thereby reducing manufacturing cost while maintaining 3D image display capability through optical path control.
Solution Approach 2:
The patent extracts the liquid crystal layer from the 3D light controller configuration and replaces it with a purely optical solution using light guide plates with specific patterns. This extraction removes the expensive liquid crystal component while preserving the essential function of controlling light paths to create viewing zones for 3D display.
2Adaptability or versatility
If a separate 3D light controller with liquid crystal layer is used, then light control for 3D display is achieved, but device complexity increases
Solution Approach 1:
The patent combines the light control functionality into the backlight unit itself through the 3D light guide plate with integrated light sources and optical patterns. This merging eliminates the need for a separate 3D light controller component, thereby reducing device complexity while maintaining full light control capability for 3D display through the optical patterns in the light guide plate.
3Manufacturing precision
If liquid crystal layer is used in 3D light controller, then viewing zone control is achieved, but manufacturing cost increases
Solution Approach 1:
The patent extracts the liquid crystal layer from the system and replaces it with a 3D light guide plate containing precisely engineered optical patterns (lens arrays or prisms). These patterns provide viewing zone control through their geometric design rather than liquid crystal modulation, achieving the same precision in viewing zone definition without the high manufacturing cost of liquid crystal layers.
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 solution reduces manufacturing costs by eliminating the need for a separate 3D light controller with a liquid crystal layer while maintaining the capability to display 3D images without compromising image quality, as the 3D light guide plate and light sources effectively control light distribution to create the necessary viewing zones.
Implementation Method 1
a 3D light guide plate including first light output patterns, first light sources irradiating light to at least one side of the 3D light guide plate
Data Source
AI summary
Discussed are a backlight unit and an autostereoscopic 3D (three-dimensional) display device including the same, in which a 3D image can be displayed without using a 3D light controller that includes a liquid crystal layer. The backlight unit may include a 3D light guide plate having first light output patterns, first light sources irradiating light to at least one side of the 3D light guide plate, a 2D (two-dimensional) light guide plate arranged below the 3D light guide plate, and second light sources irradiating light to at least one side of the 2D light guide plate. The first light output patterns are a plurality of line prism patterns spaced apart from each other.