Surface Light Source Device with Multi-Axis Lenticular Lens Sheets
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Solution Overview
Problem
Conventional liquid crystal display (LCD) panels face challenges in achieving uniform brightness due to the use of point light sources, leading to brightness unevenness, especially with the increasing thinness of LCD panels and the transition from cathode-ray tubes to light emitting diodes (LEDs).
Innovation Solution
A surface light source device is designed with a matrix arrangement of light emitting elements and lenticular lens sheets having specific groove orientations and configurations to diffuse light evenly, reducing brightness unevenness. This device includes a base with light emitting elements, lenses, a first lenticular lens sheet with grooves along the X-axis, a second lenticular lens sheet with grooves rotated 60 degrees, and a third lenticular lens sheet with grooves rotated 120 degrees, along with a fluorescent material sheet and prism sheets to enhance light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If point light sources (LEDs) are used to illuminate LCD panels, then the device can be thinned, but brightness unevenness occurs
Solution Approach 1:
The patent introduces a light guide plate as an intermediary component between the point light sources and the LCD panel. The light guide plate receives light from the LEDs and redistributes it across the panel surface through its optical structure, converting point source illumination into uniform area illumination while maintaining the thin profile enabled by LED technology
Solution Approach 2:
The patent replaces the traditional cathode-ray tube illumination system with a light guide plate and LED system. This substitution eliminates the need for bulky mechanical illumination components while achieving both thinness and uniform brightness through optical design rather than mechanical structure
2Illumination intensity
If multiple lenticular lens sheets with different groove orientations are added, then brightness uniformity is improved, but device complexity increases
Solution Approach 1:
The patent segments the light distribution function into multiple lenticular lens sheets, each with specific groove orientations (0°, 60°, 120°). Each sheet handles a particular aspect of light redirection, and their combined effect achieves comprehensive uniformity. This segmentation allows optimization of each component's function while collectively solving the overall uniformity problem
Solution Approach 2:
The lenticular lens sheets serve multiple functions simultaneously: they redirect light in specific directions, distribute light uniformly across the panel, and maintain the compact structure. Each optical component is designed to perform multiple optical functions, reducing the need for additional separate components and managing the complexity through multi-functionality
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 reduces brightness unevenness by diffusing light in a batwing illumination pattern, allowing for a thinner device design while maintaining uniform illumination, which is essential for modern LCD panels used in displays like TVs and monitors.
Implementation Method 1
a first lenticular lens sheet having a plurality of first grooves in an upper surface of the first lenticular lens sheet in a direction along the X-axis direction, a second lenticular lens sheet having a plurality of second grooves in an upper surface of the second lenticular lens sheet in a direction along the Y-axis direction
Implementation Method 2
Lenses has a batwing illumination distribution. Each of the lenses covers each of the light emitting elements
Data Source
AI summary
A base has a base surface. Light emitting elements are disposed on the base surface along an X-axis with an X pitch and along the Y axis with a Y pitch to form a matrix. The X pitch is smaller than the Y pitch. Lenses has a batwing illumination distribution. Each of the lenses covers each of the light emitting elements. A first lenticular lens sheet is provided on the base such that a first lenticular lens sheet lower surface is opposite to the base surface. A second lenticular lens sheet is provided on the first lenticular lens sheet such that a second lenticular lens sheet lower surface is opposite to a first lenticular lens sheet upper surface. A third lenticular lens sheet is provided on the second lenticular lens sheet such that a third lenticular lens sheet lower surface is opposite to a second lenticular lens sheet upper surface.