Oblique Backlight and Prism Optics for Wider LCD Viewing Angles
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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 to split light fluxes into two directions and an optical component with interfaces having different refractive indices to refract and reflect light, reducing the difference in optical characteristics across viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the light emitting section outputs light in a perpendicular direction with respect to the first surface of the liquid crystal section, then the light utilization efficiency is improved, but the view angle characteristics deteriorate due to significant differences in optical characteristics when viewed from different angles
Solution Approach 1:
The light emitting section is divided into multiple light emitting units that emit light in different oblique directions (e.g., ±45 degrees) rather than a single perpendicular direction. This segmentation of the light source allows light to enter the liquid crystal layer from multiple angles, improving view angle characteristics while maintaining overall light utilization efficiency through the combined effect of all units
Solution Approach 2:
The patent employs asymmetric light emission angles (oblique directions at ±45 degrees) instead of symmetric perpendicular emission. This asymmetric configuration allows the light to interact with the liquid crystal layer in a manner that reduces viewing angle dependence, as the oblique entry angles match the liquid crystal molecule orientation better for off-axis viewing
2Adaptability or versatility
If the light emitting section outputs light in an oblique direction with respect to the first surface of the liquid crystal section, then the view angle characteristics are improved, but the light utilization efficiency deteriorates
Solution Approach 1:
The patent employs multiple light emitting units that can be dynamically controlled to emit light in different oblique directions. This dynamic configuration allows the system to adapt light emission patterns to optimize both view angle characteristics and light utilization efficiency depending on viewing conditions and display requirements
Solution Approach 2:
The patent changes the emission angle parameter from perpendicular (0 degrees) to oblique angles (±45 degrees) to improve view angle characteristics. By carefully selecting these specific oblique angles, the patent optimizes the balance between viewing angle performance and light utilization efficiency, as these angles better match the liquid crystal layer's optical properties for off-axis viewing
3Illumination intensity
If high directivity light is emitted from the backlight, then the light intensity is improved, but the color variation when viewed from different angles increases
Solution Approach 1:
The backlight is segmented into multiple light emitting units positioned at different locations and orientations. Each unit emits light in a specific oblique direction, and their combined output provides both high overall intensity and reduced color variation, as the distributed oblique emission patterns compensate for each other's angular dependencies
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 reducing the difference in optical characteristics and color variation when viewed from different directions, enhancing image quality and energy efficiency while maintaining 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.