Elliptical Lens Optical Plate for LCD Backlight Uniformity
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Solution Overview
Problem
Conventional diffusion plates in liquid crystal display devices lower brightness levels, deteriorating image quality due to light diffusing agents.
Innovation Solution
An optical plate with elongated lens patterns forming an elliptical cross-section and an embossing pattern on a transparent main body plate, which is formed simultaneously with the lens patterns, and includes an ultraviolet ray blocking layer, enhancing light transmittance and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a diffusion plate with light diffusing agent is used, then light diffusion is achieved, but brightness level is lowered and image quality deteriorates
Solution Approach 1:
The patent removes the light diffusing agent from the optical plate composition entirely. Instead of using a homogeneous diffusing medium, it employs a structured surface with lens patterns that achieve diffusion through geometric optics rather than material scattering, thereby eliminating the brightness-reducing effect of diffusing agents while maintaining diffusion functionality
Solution Approach 2:
The patent uses lens patterns with curved surfaces (circular, elliptical, or asymmetric cross-sections) to refract and diffuse light. The curved geometry of the lens patterns redirects light rays to achieve uniform illumination without requiring diffusing agents, thus preserving brightness while providing diffusion
2Stability of the object's composition
If conventional diffusion plate is used, then light diffusion is provided, but light loss increases and transmittance decreases
Solution Approach 1:
By removing the light diffusing agent and replacing it with a transparent structured surface, the patent eliminates the material that causes light absorption and scattering losses. The lens patterns are formed in a transparent substrate without additional diffusing materials, reducing overall light loss and maintaining high transmittance
Solution Approach 2:
The patent replaces the material-based diffusion mechanism (relying on diffusing agents to scatter light) with a geometric-optical mechanism (using lens patterns to refract and redirect light). This substitution reduces energy loss by using refraction rather than scattering, achieving diffusion with higher light efficiency
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 optical plate improves light uniformity and brightness distribution, reducing light loss and maintaining high transmittance, thus enhancing image quality without the need for diffusing agents.
Implementation Method 1
A diffusion plate for the diffusion of light may be disposed between the light source and the LCD panel to uniformly illuminate the LCD panel
Implementation Method 2
An optical plate may include an ultraviolet ray blocking layer formed on the second surface of the main body plate opposite to the first surface and including an ultraviolet ray blocking agent
Data Source
AI summary
An optical plate includes a main body plate, and a plurality of lens patterns formed on a first surface of the main body plate, wherein the lens patterns are elongated in a first direction and arranged in parallel with each other in a second direction crossing the first direction, wherein a cross section of the lens patterns form a part of an ellipse shape, the ratio of a semi-major axis to a semi-minor axis of the ellipse shape ranging from about 1.65 to about 1.75.