LED Display Optical Element for Front Luminance Uniformity
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Solution Overview
Problem
Existing light emitting diode (LED) display devices suffer from inefficient luminance at the front side due to a 'M' shape luminance distribution, where luminance is low at 0° viewing angle and high at other angles.
Innovation Solution
The implementation of a light emitting diode display device that includes a light emitting diode on a substrate and an optical element with randomly distributed liquid crystal molecules. This optical element changes the path of light emitted from the LED, improving front luminance and preventing non-uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional LED display device is used, then the device structure is simple, but the luminance distribution is 'M' shaped with low front luminance at 0° viewing angle
Solution Approach 1:
An optical element containing liquid crystal molecules is introduced as an intermediary component between the LED and the viewing environment. This optical element mediates the light path by refracting and redirecting light rays, converting the conventional 'M' shaped luminance distribution into a more uniform pattern with enhanced front luminance at 0° viewing angle
Solution Approach 2:
The optical element changes the optical parameters of light propagation by utilizing the refractive properties of liquid crystal molecules. By controlling the orientation and distribution of liquid crystal molecules, the light path parameters are modified to achieve improved luminance distribution and front luminance enhancement
2Reliability
If transfer tolerance occurs in conventional LED display, then the luminance non-uniformity increases, but the optical element with random liquid crystal distribution prevents this non-uniformity
Solution Approach 1:
The optical element employs randomly distributed liquid crystal molecules to create a homogeneous optical effect across the entire display surface. This random distribution ensures that local variations or transfer tolerances during manufacturing do not result in visible luminance non-uniformity, as the statistical homogeneity of the random distribution compensates for manufacturing variations
3Productivity
If light extraction efficiency is improved through optical element, then the light path is changed and front luminance is enhanced, but the device complexity increases
Solution Approach 1:
The optical element utilizes the inherent optical properties of liquid crystal molecules to automatically redirect and optimize light paths without requiring external control mechanisms. The liquid crystal molecules naturally refract light based on their molecular orientation, providing self-service light extraction enhancement that improves front luminance without adding complex control systems
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 enhances front luminance, improves light extraction efficiency, and prevents luminance non-uniformity, even when transfer tolerance occurs, thereby providing more efficient and uniform illumination.
Implementation Method 1
an optical element provided with liquid crystal molecule randomly distributed therein and configured to change a path of light emitted from the light emitting diode
Implementation Method 2
light emitted downward from the light emitting diode is reflected or scattered by the lower optical element and has a changed light path in an upward direction
Implementation Method 3
light emitted downward from the light emitting diode is reflected or scattered by the lower optical element and has a changed light path in an upward direction
Data Source
AI summary
Disclosed is a light emitting diode display device comprising a light emitting diode over a substrate, and an optical element provided with liquid crystal molecule randomly distributed therein and configured to change a path of light emitted from the light emitting diode.