Light-Distribution Adjustment Sheet With Curved-Flat Protrusions
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Solution Overview
Problem
Liquid crystal displays face significant challenges in improving viewing angle characteristics due to refractive index anisotropy, with existing methods either failing to provide sufficient improvement or increasing costs and complexity.
Innovation Solution
A light-distribution adjustment sheet with protrusions featuring a curved surface and a flat surface is placed on the display panel, allowing for the adjustment of light distribution and reducing refractive index anisotropy, thereby enhancing viewing angle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a lens sheet with columnar lenses or prismatic prism lenses is disposed on the front face of the liquid crystal panel, then the viewing angle characteristic is improved to some extent, but the improvement is not sufficient
Solution Approach 1:
The protrusion is divided into a first region with a curved surface and a second region with a flat surface. The curved surface region refracts light to widen the viewing angle, while the flat surface region maintains front-face luminance. This segmentation allows simultaneous optimization of viewing angle and luminance characteristics.
Solution Approach 2:
Different regions of the protrusion have different surface properties (curved vs. flat) to perform different optical functions. The curved surface provides light refraction for oblique viewing, while the flat surface maintains direct luminance. This local differentiation resolves the contradiction between viewing angle and luminance.
2Illumination intensity
If various liquid crystal modes (MVA, IPS) are used to reduce refractive index anisotropy, then the viewing angle characteristic is improved, but the inner structure becomes more complex and costs increase
Solution Approach 1:
Instead of modifying the complex inner liquid crystal structure, the invention extracts the optical adjustment function to an external element (the protrusion with curved and flat surfaces). This external element handles the light distribution without requiring complex internal liquid crystal mode changes, thereby reducing overall system complexity.
Solution Approach 2:
The protrusion acts as an intermediary optical element between the liquid crystal panel and the viewer. It mediates the light distribution by refracting light from the curved surface and transmitting it through the flat surface, achieving wide viewing angle without modifying the liquid crystal layer's complex internal structure.
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 effectively widens the viewing angle range and improves contrast, while maintaining front-face luminance, by refracting light in one direction and allowing non-refracted light to pass through, thus addressing the limitations of existing technologies.
Implementation Method 1
the protrusion includes a first region including a curved surface... This makes it possible to adjust a light-distribution direction of light that enters from side on which the protrusion is disposed
Implementation Method 2
a second region including a flat surface... allowing non-refracted light to pass through
Data Source
AI summary
A display unit of the disclosure includes a display panel and a light-distribution adjustment sheet. The light-distribution adjustment sheet is provided on the display panel, and includes a protrusion that protrudes toward the display panel. The protrusion includes a first region including a curved surface, and a second region including a flat surface.