Light Source Device With Cone Sheet For Two-Dimensional Directivity
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Solution Overview
Problem
Conventional light source devices for medium- and small-sized terminal devices face challenges in achieving high directivity in two dimensions while maintaining a thin profile, as they often require multiple prism sheets or reflecting patterns that increase thickness and limit directivity in certain directions.
Innovation Solution
A light source device comprising a light-guiding member and an optical member with a flat plate and circular cones made of transparent material, where the central axes of the cones are parallel, enhancing directivity in two dimensions and allowing efficient light emission with high luminance, and a diffusion pattern on the surface of the light-guiding member for uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple prism sheets or reflecting patterns are used to increase directivity, then directivity is improved, but device thickness increases
Solution Approach 1:
The patent combines multiple optical functions (light guiding, diffusion, and directional emission) into a single integrated optical waveguide structure with surface patterns, eliminating the need for separate prism sheets and reflecting patterns. This merging of functions achieves high directivity while reducing overall device thickness.
Solution Approach 2:
The optical waveguide incorporates localized surface patterns (dots, lines, or other geometric features) at specific positions to control light emission directions. By strategically placing these patterns, the patent achieves directional control in multiple directions simultaneously without requiring multiple separate optical components, thus reducing thickness.
2Length of stationary object
If conventional light source devices are designed for thin profile, then thickness is reduced, but directivity in two dimensions is limited
Solution Approach 1:
The patent uses surface patterns on the optical waveguide that can control light emission in multiple directions (two-dimensional directivity) while maintaining a thin profile. The surface patterns are designed to work within the constraints of a thin structure, achieving directional control without requiring additional thickness.
3Illumination intensity
If prism sheets with large apex angles are used to enhance frontal luminance, then frontal directivity is improved, but device complexity and thickness increase
Solution Approach 1:
The patent integrates the light guiding function and the light directional control function into a single optical waveguide structure with surface patterns, eliminating the need for separate prism sheets. This reduces structural complexity while achieving high frontal luminance through the combined optical path design.
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 a thinner light source device with increased directivity in both dimensions, reducing power consumption and thickness, while minimizing moiré effects when combined with display panels, and allowing for a slim chassis with a large screen in mobile devices.
Implementation Method 1
an optical waveguide for propagating and emitting in planar fashion the light emitted by the light source
Implementation Method 2
the light rays are focused in the front direction, and the frontal luminance is enhanced
Data Source
AI summary
The light source device of a display device according to the present invention has an optical waveguide, a cone sheet, and a light source disposed along the side surface of the optical waveguide. The light-emitting surface of the optical waveguide is flat, and a tilted surface that is tilted towards the light source with respect to the light-emitting surface is formed on the light-diffusing surface. The cone sheet has a flat plate and a plurality of circular cones arranged two-dimensionally on the light-incident surface of the flat plate. The central axes of the circular cones are parallel to each other. The invention provides a light source device that can be made thin and is capable of increasing the directivity of emitted light in two dimensions.