LED Display Scattering Pattern for Front Luminance Uniformity
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Solution Overview
Problem
Light-emitting diode display apparatuses face issues with luminance non-uniformity due to rapid luminance differences between the front and side surfaces, asymmetry in luminance at directional angles, and inefficient luminance distribution, particularly exhibiting an 'M' shape with maximum luminance at viewing angles greater than 0°, leading to low luminance on the front surface.
Innovation Solution
Incorporating a substrate with light-emitting diodes and a scattering pattern that redirects light not emitted towards the front surface, along with lenses or reflective structures, to enhance luminance distribution and efficiency by scattering light that would otherwise be lost through internal total reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional light-emitting diode structure is used, then the device is simple and easy to manufacture, but the luminance distribution is inefficient with maximum luminance at viewing angles greater than 0° and low luminance on the front surface
Solution Approach 1:
The patent introduces a scattering layer as an intermediary component between the light-emitting diode and the front surface. This scattering layer redirects light that would otherwise be emitted at angles greater than 0° toward the front surface (0° viewing angle), thereby improving front surface luminance without fundamentally changing the LED structure itself. The scattering layer acts as a mediator that transforms the directional light emission into a more favorable luminance distribution.
Solution Approach 2:
The patent modifies the optical parameters of the display apparatus by introducing a scattering layer with specific scattering properties. This changes the light emission pattern from a conventional angular distribution (with maximum at angles greater than 0°) to an optimized distribution with enhanced luminance at the front surface (0° viewing angle). The scattering layer's optical parameters are designed to achieve the desired luminance distribution while maintaining manufacturing feasibility.
2Productivity
If light is emitted at angles greater than 0° from the light-emitting diode, then the total light output is maximized, but the luminance distribution becomes inefficient with an 'M' shape pattern and low front surface luminance
Solution Approach 1:
The patent converts the harmful effect of light emitted at angles greater than 0° (which causes inefficient luminance distribution and low front surface luminance) into a beneficial effect. The scattering layer takes light that would be wasted at oblique angles and redirects it toward the front surface, transforming what was previously a problem (light emission at unwanted angles) into a solution (enhanced front surface luminance). This converts the 'harm' of angular light emission into a 'blessing' of improved luminance distribution.
3Stability of the object's composition
If no scattering pattern is provided, then the device structure is simple, but rapid luminance difference occurs between front surface and side of the panel causing stains
Solution Approach 1:
The scattering layer serves as an intermediary that equalizes luminance between the front surface and sides of the panel. By scattering light that would otherwise create rapid luminance differences, this layer acts as a mediator that smooths out luminance variations and prevents stain formation. The scattering layer intercepts light before it can create harmful luminance gradients, thereby maintaining luminance uniformity.
4Illumination intensity
If a conventional LED structure without scattering pattern is used, then manufacturing is easier, but asymmetry is generated in luminance of left and right directional angles
Solution Approach 1:
The scattering layer introduces homogeneity into the light emission pattern by randomly scattering light in multiple directions. This homogeneous scattering effect counteracts the asymmetry that would otherwise occur in left and right directional angles from the conventional LED structure. The scattering layer creates a uniform luminance distribution across different viewing angles, eliminating directional asymmetry while maintaining manufacturing simplicity.
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 significantly increases front surface luminance and total extracted light, improving luminance distribution by redirecting light towards the front surface, thereby enhancing the display's overall light efficiency and reducing luminance inefficiencies at specific viewing angles.
Implementation Method 1
a scattering pattern provided on the light emitting diode, wherein the scattering pattern is disposed such that a part of light generated from the light-emitting diode which is not emitted toward a front surface of the light-emitting diode display apparatus passes through the scattering pattern
Implementation Method 2
scattering light that would otherwise be lost through internal total reflection
Implementation Method 3
a lens or a reflective structure disposed to overlap each of the first and second light-emitting diodes
Data Source
AI summary
A light-emitting diode display apparatus may include a substrate, a light-emitting diode provided on the substrate, and a scattering pattern provided on the light emitting diode, wherein the scattering pattern is disposed such that a part of light generated from the light-emitting diode, which is not emitted toward a front surface of the light-emitting diode display apparatus, passes through the scattering pattern and does not overlap the light-emitting.