Light Convergence Structure for Backlight Module Collimation
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Solution Overview
Problem
Current directional optics in intelligent displays face challenges in achieving collimated beams without reducing brightness, and existing solutions like film drilling and absorption gratings increase module thickness, failing to meet low power consumption and structural optimization requirements.
Innovation Solution
A light convergence structure comprising frustum and plano-convex structures on a light guide plate, where the frustum structure's first end surface is smaller than the second end surface, and the plano-convex structure's flat surface contacts the second end surface, allowing for total reflection and refraction to form collimated light perpendicular to the incident surface, with connectors and shading portions to optimize light direction and minimize loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If film drilling or absorption grating is used to achieve collimated beams, then light direction control is improved, but module thickness increases
Solution Approach 1:
The light guide plate surface is divided into multiple regions with different structures: frustum structures for total reflection and plano-convex structures for refraction. This segmentation allows each region to perform a specific optical function, achieving collimation without increasing overall module thickness.
Solution Approach 2:
The invention transitions from traditional planar optical elements to three-dimensional microstructures (frustum and plano-convex combinations) on the light guide plate surface. This dimensional change enables effective light control in a thin profile by utilizing vertical space within the light guide plate thickness.
2Illumination intensity
If traditional optical elements are used to achieve collimation, then light direction control is improved, but brightness is reduced
Solution Approach 1:
The invention replaces absorption-based optical elements with a refraction-based system using plano-convex structures. Instead of mechanically blocking or absorbing light, the curved surfaces refract light to achieve collimation, preserving brightness while controlling light direction.
Solution Approach 2:
The invention changes the optical parameters by using specific refractive index materials and precisely controlling the curvature radii of the plano-convex structures. This allows optimization of light refraction angles to achieve collimation with minimal brightness loss.
3Device complexity
If conventional light guide structures are used, then structural simplicity is maintained, but light convergence and collimation performance deteriorates
Solution Approach 1:
The invention merges two optical functions (total reflection from frustum structures and refraction from plano-convex structures) into a single integrated light guide plate design. This combination achieves superior light convergence and collimation performance while maintaining relatively simple manufacturing processes.
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 adjusts light directions in two dimensions without reducing brightness, enhancing collimation and meeting design requirements for low power consumption and structural optimization, with improved brightness and uniformity compared to existing technologies.
Implementation Method 1
an angle is defined between an outer periphery surface of each frustum structure and the light incident surface, and the angle is greater than such a preset angle so that light entering into the frustum structure is totally reflected on an inner side wall of the frustum structure
Implementation Method 2
a curvature of the convex spherical surface satisfies a preset condition such that light totally reflected by an inner side wall of the frustum structure is refracted to form a collimated light perpendicular to the light incident surface
Data Source
AI summary
A light convergence structure includes light convergence portions. Each light convergence portion includes a frustum structure and a plano-convex structure. The frustum structure includes a first end surface and an opposite second end surface. An area of the first end surface is less than an area of the second end surface. The plano-convex structure is on the second end surface of the frustum structure. The plano-convex structure includes a flat surface and an opposite convex spherical surface. The flat surface is in contact with the second end surface. An area of the flat surface is equal to the area of the second end surface. The first end surfaces of the light convergence portions are coplanar and together define a light incident surface of the light convergence structure.