Liquid Crystal Display Optics With Inclined Refractive Interfaces
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Solution Overview
Problem
Existing liquid crystal display apparatuses suffer from poor view angle characteristics due to the high directivity of light emitted by the backlight, leading to significant differences in optical characteristics and color variation when viewed from different angles.
Innovation Solution
A light emitting apparatus and display apparatus are designed with a light emitting section that outputs light in an oblique direction, utilizing a first prism sheet and an optical component with inclined interfaces having different refractive indices to refract and reflect light, reducing the difference in optical characteristics between perpendicular and oblique views.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the light emitting section outputs light with high directivity in a perpendicular direction, then light utilization efficiency is improved, but view angle characteristics deteriorate due to significant differences in optical characteristics when viewed from different angles
Solution Approach 1:
The optical component is divided into multiple regions with different interface inclination angles. The first region has an interface inclined at a first angle, while the second region has an interface inclined at a second angle different from the first angle. This segmentation allows different light rays to be refracted at different angles, expanding the angular range of light synthesis and improving view angle characteristics while maintaining light utilization efficiency.
Solution Approach 2:
Different regions of the optical component are assigned different local optical properties through varying interface inclination angles. The first region processes light with a specific refraction angle optimized for front viewing, while the second region processes light with a different refraction angle optimized for oblique viewing. This local quality variation ensures optimal performance across different viewing angles.
2Illumination intensity
If the light emitting section outputs light with high directivity, then brightness in the perpendicular direction is improved, but color variation increases when viewed from oblique directions
Solution Approach 1:
The optical component is segmented into multiple regions with different interface inclination angles to process different angular ranges of light. This segmentation ensures that light rays entering at different angles are refracted appropriately, maintaining consistent color characteristics across various viewing directions while preserving high brightness in the perpendicular direction.
Solution Approach 2:
The interface inclination angle parameter is varied across different regions of the optical component. By changing this geometric parameter, the refraction angle of light is adjusted for different viewing directions, thereby controlling color variation and maintaining color consistency across the viewing angle range.
3Device complexity
If a conventional backlight with high directivity light is used, then device simplicity is maintained, but view angle characteristics and image quality deteriorate
Solution Approach 1:
An optical component with inclined interfaces acts as an intermediary between the light emitting section and the liquid crystal panel. This intermediary component redirects light rays at different angles into the liquid crystal panel, expanding the angular range of light synthesis and improving view angle characteristics without significantly increasing overall device complexity.
Solution Approach 2:
The interface inclination angle parameter of the optical component is optimized to transform the light distribution pattern from the backlight. By adjusting this parameter, the system achieves improved view angle characteristics and image quality while maintaining relative structural simplicity.
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 design improves view angle characteristics by widening the angular range of light synthesis, reducing color variation, and enhancing image quality across different viewing angles without losing light utilization efficiency.
Implementation Method 1
an optical component facing the second surface of the liquid crystal section and having an interface, in which the interface is inclined with respect to the second surface and has different refractive indices
Implementation Method 2
The light having passed through the liquid crystal layer is refracted (passes through) and reflected at the interface of the optical component to be extracted
Data Source
AI summary
A light emitting apparatus includes: a liquid crystal section having a liquid crystal layer between a first surface and a second surface that face each other; a light emitting section that has a light output surface and outputs light from the light output surface with respect to the first surface in an oblique direction, in which the light output surface faces the first surface of the liquid crystal section; and an optical component facing the second surface of the liquid crystal section and having an interface, in which the interface is inclined with respect to the second surface and has different refractive indices.