Optical Modulation Unit for Stereoscopic Display
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Solution Overview
Problem
Existing stereoscopic display devices face challenges in accurately emitting light for left-eye and right-eye images in different polarization states, leading to complex structures and increased manufacturing costs.
Innovation Solution
An optical modulation unit comprising a liquid crystal cell and a phase retardation film, which simplifies the manufacturing process by using a single liquid crystal cell and a phase retardation film to achieve the required phase delays of λ/4 and -λ/4 for each eye, reducing complexity and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If two liquid crystal cells are used to achieve accurate phase delays of λ/4 and -λ/4 for left-eye and right-eye images, then the polarization accuracy is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the functions of two separate liquid crystal cells into a single liquid crystal cell by introducing a phase retardation film. The liquid crystal cell works in conjunction with the phase retardation film to achieve the differential phase delays (λ/4 and -λ/4) that were previously requiring two separate cells, thereby reducing structural complexity while maintaining polarization accuracy
Solution Approach 2:
The phase retardation film acts as an intermediary element that modifies the optical path of light passing through the liquid crystal cell. By introducing this intermediate component, the system can achieve the equivalent effect of two liquid crystal cells using only one, thus resolving the contradiction between manufacturing precision and device complexity
2Reliability
If two liquid crystal cells are used to achieve accurate phase delays, then the stereoscopic display performance is improved, but the manufacturing cost increases
Solution Approach 1:
The patent merges the functionality of two expensive liquid crystal cells into a single cell配合 phase retardation film assembly. This reduction in component count directly lowers manufacturing costs while the phase retardation film ensures that the stereoscopic display performance (accurate phase delays of λ/4 and -λ/4) is maintained
Solution Approach 2:
The patent changes the optical parameters of the system by introducing a phase retardation film with specific retardation characteristics. This parameter change allows the single liquid crystal cell to achieve the same optical effect as two cells, thereby reducing manufacturing cost while preserving display performance
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 enables accurate phase delays for left-eye and right-eye images, enhancing the viewer's stereoscopic experience while simplifying the structure and reducing manufacturing costs compared to using two liquid crystal cells.
Implementation Method 1
a liquid crystal cell switchable between 0 and λ/2
Implementation Method 2
a phase retardation film that delays a phase of light by a predetermined amount
Data Source
Figure 1~3
AI summary
The present inventive concept provides, for an optical modulation unit of which the manufacturing is simplified and the performance is improved and a stereoscopic display having the same, an optical modulation unit and a stereoscopic display device comprising the same, the optical modulation unit comprising: a liquid crystal cell having different phase delay amounts of penetrated light in the on and off states; and a phase delay film part arranged on at least one among an optical path of light having passed through the liquid crystal cell and an optical path of light entering into the liquid crystal cell, and comprising a phase delay film having a fixed phase delay amount, wherein when a wavelength of light, which has passed through both the liquid crystal cell and the phase delay film part, is λ, a phase delay amount of the light having passed through both the liquid crystal cell and the phase delay film part is λ/4 when the liquid crystal cell is in the on state and -λ/4 when the liquid crystal cell is in the off state, or is -λ/4 when the liquid crystal cell is in the on state and λ/4 when the liquid crystal cell is in the off state.