Hybrid Optical Lens for LCD Backlight Luminance Control
Solution Overview
Problem
Large LCD devices face challenges with luminance uniformity and power consumption due to the increased number of light emitting diodes required for larger screens, leading to increased size, thickness, and manufacturing costs.
Innovation Solution
A hybrid-typed optical lens with a central convex and peripheral concave shape that refracts and reflects light to increase luminance in the top direction while decreasing it in the horizontal direction, effectively covering a larger area with fewer LEDs, incorporating a reflecting plate to manage light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of light emitting diodes is increased to cover a large screen, then the luminance uniformity is improved, but the power consumption and manufacturing cost are increased
Solution Approach 1:
The optical lens applies different surface geometries to different regions: a convex central portion for light concentration and a concave peripheral portion for light diffusion. This local differentiation allows the single LED to achieve uniform luminance distribution across the large screen without increasing the number of LEDs, thereby avoiding increased power consumption
Solution Approach 2:
The invention transitions from a planar LED arrangement to a three-dimensional optical lens structure with varying surface curvature. The convex-concave profile creates multiple light paths and reflection angles, enabling a single LED to illuminate a large screen area uniformly without requiring multiple LEDs
2Illumination intensity
If the number of light emitting diodes is increased to cover a large screen, then the luminance uniformity is improved, but the manufacturing cost is increased
Solution Approach 1:
The invention combines the functions of multiple LEDs into a single LED by integrating a complex optical lens structure. The convex-concave lens performs multiple optical functions (light gathering, directional control, uniformity adjustment) that would otherwise require multiple separate light sources, thereby reducing manufacturing cost while maintaining luminance uniformity
3Illumination intensity
If a side illumination typed optical lens is used, then the luminance uniformity is increased, but light leakage occurs
Solution Approach 1:
The convex central portion directs light upward to maintain high luminance, while the concave peripheral portion controls and contains light distribution to the edges without allowing lateral leakage. This localized functional assignment achieves both luminance uniformity and light containment
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 solution enhances luminance uniformity and reduces power consumption and manufacturing costs for large screen LCD devices by increasing the area covered by each LED, while maintaining negligible light leakage.
Implementation Method 1
The optical lens refracts and reflects a light to increase a luminance in a top direction of the optical lens and to decrease a luminance in a horizontal direction of the optical lens
Implementation Method 2
The optical lens refracts and reflects a light to increase a luminance in a top direction of the optical lens and to decrease a luminance in a horizontal direction of the optical lens
Implementation Method 3
The reflecting plate is interposed between the light emitting diode and the optical lens to reflect a portion of the light leaked from the optical lens
Data Source
AI summary
An optical lens refracts and reflects a light to increase a luminance in a top direction of the optical lens and to decrease a luminance in a horizontal direction of the optical lens. The optical lens includes a central portion and a peripheral portion. The central portion has a convex shape. The peripheral portion has a concave shape. The peripheral portion surrounds the central portion. Therefore, a power consumption and a manufacturing cost are decreased.