Wavy Phase Difference Regions for 3D Display Crosstalk Reduction
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Solution Overview
Problem
In stereoscopic image display units using phase difference devices, a long distance between the phase difference device and the image display surface can lead to positional displacement and deterioration of 3D characteristics, specifically crosstalk, when viewed from an oblique direction.
Innovation Solution
A display unit with a phase difference device that includes phase difference regions with different slow-axis directions, where the side sections of these regions have waviness with an amplitude that satisfies specific expressions to reduce light incidence between left-eye and right-eye pixels, thereby minimizing crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the phase difference device is placed at a long distance from the image display surface, then the device structure is simplified and easier to manufacture, but positional displacement occurs when viewed from oblique directions and crosstalk deteriorates
Solution Approach 1:
The side sections of the phase difference regions are designed with wavy (curved) configurations instead of straight lines. This curvature allows the phase difference device to maintain effective alignment with the display panel across oblique viewing angles, reducing positional displacement effects while keeping the device at a manufacturable distance from the image display surface.
Solution Approach 2:
Different portions of the phase difference device have different structural characteristics. The central regions maintain standard configurations for ease of manufacture, while the side sections incorporate wavy patterns specifically to address crosstalk issues. This localized modification optimizes performance where needed without complicating the entire device structure.
2Device complexity
If the phase difference device is placed at a long distance from the image display surface, then the device complexity is reduced, but the 3D characteristics and crosstalk performance deteriorate
Solution Approach 1:
The wavy configuration of side sections provides an elegant geometric solution that maintains 3D characteristics without requiring complex multi-layer structures or additional components. This simple curvature modification achieves the desired optical performance while keeping the device relatively simple.
Solution Approach 2:
The invention modifies the geometric parameters of the phase difference regions (introducing wavy patterns with specific amplitudes and wavelengths) to optimize optical performance. By adjusting these parameters, the device maintains effective alignment and reduces crosstalk without increasing overall structural complexity.
3Ease of manufacture
If straight side sections are used in phase difference regions, then the manufacturing process is simpler, but light leakage occurs between regions causing crosstalk
Solution Approach 1:
Replacing straight side sections with wavy configurations creates a physical barrier that redirects light paths. The curved geometry prevents direct light leakage between adjacent phase difference regions while maintaining manufacturing feasibility through standard photolithography processes capable of forming curved patterns.
Solution Approach 2:
The wavy side sections introduce asymmetry into the phase difference region boundaries, breaking the straight-line symmetry. This asymmetric configuration effectively blocks light paths that would otherwise leak between regions, reducing crosstalk while the pattern remains symmetric enough for practical manufacturing.
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 described configuration reduces light leakage between phase difference regions, effectively minimizing crosstalk and maintaining 3D image quality even when viewed from oblique angles.
Implementation Method 1
a phase difference device which includes a phase difference layer in which two or more kinds of phase difference regions having different slow-axis directions are arranged in correspondence with the respective pixels
Implementation Method 2
a side section, of each of the phase difference regions, that is in contact with the phase difference region of a different kind has waviness with an amplitude a that satisfies following expressions... This reduces a rate of incidence of right-eye image light into a left-eye phase difference region, or of incidence of left-eye image light into a right-eye phase difference region
Data Source
AI summary
There is provided a display unit capable of reducing deterioration in the 3D characteristics. A phase difference device is bonded to a surface on a light outgoing side of a liquid crystal display panel. In the phase difference device, two kinds of phase difference regions with slow-axis directions different from each other are arranged in correspondence with each pixel. Each of the phase difference regions is arranged in contact with the phase difference region of a different kind, and a side section, of each of the phase difference region, that is in contact with the phase difference region of the different kind has waviness with an amplitude a that satisfies following expressions:0<a<amax(φ)amax(φ)=−0.7/(φ−1.2)+0.35φ=arctan(P/(4d))P: a pixel pitchd: a distance between the pixel and the phase difference device.