Directional Backlight Unit with Absorptive Wire Grid Polarizer
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Solution Overview
Problem
Current multi-view 3D display methods based on directional backlight suffer from low light efficiency and significant cross-talk, which hinder the formation of high-quality 3D images.
Innovation Solution
A 3D image display apparatus utilizing a directional backlight unit with an absorptive wire grid polarizer and a diffraction device, where the absorptive wire grid polarizer includes metal wires arranged perpendicularly and a planarization layer to minimize cross-talk, and a diffraction device that diffracts light towards multiple viewing zones, integrated with a liquid crystal panel to modulate light according to image information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional directional backlight is used for multi-view 3D display, then the display can provide multiple viewing zones, but cross-talk between adjacent views occurs and light efficiency is low
Solution Approach 1:
The patent segments the backlight system into distinct functional components: a conventional directional backlight provides multiple viewing zones, while separate polarizing plates and wire grid polarizers are positioned at specific locations to control polarization states. This segmentation allows each component to perform its specialized function, with the polarizing elements selectively blocking or transmitting light to eliminate cross-talk between adjacent views while preserving multi-view capability.
2Adaptability or versatility
If a conventional directional backlight is used for multi-view 3D display, then the display can provide multiple viewing zones, but light efficiency is low
Solution Approach 1:
The patent changes the polarization parameters of light at different locations in the display system. By introducing polarizing plates and wire grid polarizers with specific orientation angles, the system selectively transmits or blocks light based on polarization state. This parameter change enables efficient light utilization by directing polarized light to appropriate viewing zones while blocking unwanted light, thereby improving overall light efficiency without sacrificing multi-view functionality.
3Object-generated harmful factors
If an absorptive wire grid polarizer with metal wires is introduced, then cross-talk is reduced, but the structure becomes more complex
Solution Approach 1:
The patent introduces wire grid polarizers as intermediary elements positioned between the backlight and display panel. These wire grid structures act as mediators that selectively interact with polarized light, absorbing or transmitting light based on its polarization state. By placing these intermediaries at strategic locations, the system achieves cross-talk reduction through controlled light absorption without requiring complete structural redesign of the entire display system.
4Loss of energy
If the diffraction device is positioned closer to the display panel, then light efficiency increases and cross-talk reduces, but manufacturing precision requirements increase
Solution Approach 1:
The patent performs preliminary polarization control using polarizing plates and wire grid polarizers positioned in the backlight unit, before light reaches the diffraction device. This preliminary action prepares the light in terms of polarization state, allowing the diffraction device to operate more effectively at closer positions to the display panel. By pre-conditioning the light, the system achieves improved light efficiency and cross-talk reduction while reducing the stringency of positioning precision requirements for the diffraction device.
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 effectively reduces cross-talk and enhances light efficiency, resulting in a higher quality 3D image display with improved resolution and reduced light loss, as demonstrated by increased light efficiency and minimized distance between the diffraction device and pixels.
Implementation Method 1
an absorptive wire grid polarizer disposed on the emission surface, including an a plurality of metal wires, each of the plurality of metal wires including an absorptive metal material
Implementation Method 2
an absorptive wire grid polarizer disposed on the emission surface, including an a plurality of metal wires
Implementation Method 3
a diffraction device configured to diffract the light emitted from the light guide plate toward a plurality of viewing zones
Data Source
AI summary
A three-dimensional (3D) image display apparatus includes a directional backlight unit and a display panel. The 3D image display apparatus may include an absorptive wire grid polarizer in the directional backlight unit or the display panel, for minimizing a distance between a diffraction device of the directional backlight unit and a pixel of the display panel.