Switchable Parallax Barrier for 3D Display Luminance
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Solution Overview
Problem
The parallax barrier method in 3D display devices faces limitations in converting between 2D and 3D images, often resulting in reduced luminance due to spacer defects.
Innovation Solution
A switchable parallax barrier system is developed, featuring a first and second substrate with a liquid crystal layer, insulating layers, electrodes, and spacers that maintain a gap between substrates, allowing for selective image blocking and transmission by applying different voltages to the electrodes, and a polarizing plate aligned with the alignment layers to minimize luminance defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a parallax barrier is used to achieve 3D display without glasses, then binocular disparity and three-dimensional effect are improved, but luminance is reduced due to image blocking
Solution Approach 1:
The patent applies a switchable parallax barrier that can dynamically change its state between blocking and transparent. The barrier includes a liquid crystal layer that can be controlled to switch between blocking light (for 3D mode) and allowing light passage (for 2D mode), enabling the system to adapt its optical properties based on the desired display mode rather than maintaining a fixed barrier structure
Solution Approach 2:
The patent changes the optical parameters of the barrier by using a liquid crystal layer whose refractive index and light transmission properties can be modified through voltage control. By applying different voltages, the liquid crystal molecules reorient themselves, changing the barrier's optical characteristics from light-blocking to light-transmissive state, thus resolving the luminance reduction issue
2Stability of the object's composition
If spacers are formed on the parallax barrier to maintain gap between substrates, then structural stability is improved, but luminance defects occur due to spacer positioning
Solution Approach 1:
The patent segments the spacer structure into two separate components: first spacers formed on the first substrate and second spacers formed on the second substrate. This segmentation allows each spacer set to independently maintain the gap without overlapping, preventing the luminance defects that occur when spacers are formed on a single substrate where they may interfere with the optical path
Solution Approach 2:
The patent introduces an insulating layer as an intermediary between the substrates and spacers. The spacers are formed on the insulating layer rather than directly on the substrates, which provides electrical isolation and allows for better spacing control. This intermediary structure helps maintain uniform gap distribution without the luminance defects caused by direct substrate-mounted spacers
3Reliability
If the parallax barrier blocks images for 3D conversion, then stereoscopic effect is improved, but 2D and 3D conversion becomes difficult or impossible
Solution Approach 1:
The patent implements a dynamic parallax barrier using liquid crystal technology that can switch between two operational states: a blocking state where the liquid crystal molecules are oriented to block light and create the parallax effect for 3D display, and a transparent state where the molecules are reoriented to allow light passage for 2D display. This dynamic switching capability enables seamless conversion between 2D and 3D modes without requiring separate display systems
Solution Approach 2:
The patent creates a universal display system where the same parallax barrier structure serves multiple functions: it can block light to create stereoscopic 3D effects when needed, and it can become transparent to display conventional 2D images. The switchable barrier acts as a multi-functional component that adapts its behavior based on the desired display mode, eliminating the need for separate 2D and 3D display systems
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
Enables seamless switching between 2D and 3D modes without luminance loss, improving viewing angles and reducing spacer-related defects, thereby enhancing the overall display quality.
Implementation Method 1
a liquid crystal layer between the first substrate and second substrate
Implementation Method 2
a second electrode and a third electrode on the insulating layer to generate electric field in order to transmit and block selectively an image
Implementation Method 3
a polarizing plate aligned with the alignment layers to minimize luminance defects
Data Source
AI summary
A parallax barrier according to an example can include a first substrate and a second substrate, a liquid crystal layer between the first substrate and second substrate, at least one insulating layer on the first substrate, a first electrode on the second substrate, a second electrode and a third electrode on the insulating layer to generate electric field in order to transmit and block selectively an image, a plurality of first spacers on the first substrate, and a plurality of second spacers on the second substrate. The first spacers and the second spacers can be formed in regions corresponding to each to maintain gap between the first substrate and the second substrate. Further, the first spacers can be spaced apart from the corresponding second spacers by a predetermined distance.