LED Apparatus with Phosphor and Filter Layers for Contrast
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Solution Overview
Problem
LED displays require a large number of LEDs to achieve full high definition image quality, increasing production costs and suffering from narrow color gamut, high external light reflection, and poor contrast.
Innovation Solution
An LED apparatus with a phosphor layer and a filter layer, including absorption films and lenticular lenses, is designed to absorb external light and enhance contrast by filtering wavelengths specific to each sub-pixel, reducing the influence of external light and improving color gamut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If three types of LEDs (red/green/blue) are used in one pixel to achieve full high definition image quality, then image quality is improved, but production cost increases due to requiring about 6,000,000 LEDs
Solution Approach 1:
The patent changes the fundamental parameter of light generation from using three separate LED types to using a single blue LED type with phosphor conversion. This parameter change reduces the number of LEDs required while maintaining full high definition image quality through wavelength conversion mechanisms.
Solution Approach 2:
The patent introduces phosphor materials as intermediary substances that convert blue LED light into red and green wavelengths. This intermediary mechanism allows a single LED type to produce multiple colors, reducing the total LED count while preserving image quality.
2Quantity of substance
If only one type of LED (blue LED) with red and green phosphors is used to reduce production cost, then production cost is reduced, but color gamut becomes narrow
Solution Approach 1:
The patent segments the color generation function by separating the light source (blue LED) from the color conversion function (phosphor layer and filter layer). This segmentation allows independent optimization of each component to achieve wide color gamut while using only one LED type.
Solution Approach 2:
The patent employs composite material structures including phosphor layers combined with filter layers. This composite approach enables the system to achieve wide color gamut by combining the spectral properties of phosphors with the selective transmission characteristics of filters.
3Object-affected harmful factors
If a filter layer is formed directly on the LED layer without a phosphor layer to improve contrast, then contrast is improved, but external light absorption efficiency decreases
Solution Approach 1:
The patent introduces the phosphor layer as an intermediary between the LED layer and filter layer. This intermediary layer absorbs excess external light through phosphor conversion while allowing the filter layer to selectively pass desired wavelengths, thereby maintaining both contrast improvement and external light absorption 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 solution effectively reduces production costs, enhances contrast, and expands the color gamut by selectively absorbing and filtering external light, improving the overall image quality of LED displays.
Implementation Method 1
a phosphor layer which is stacked on a top of the LED layer and includes a phosphor corresponding to at least a part of the plurality of sub-pixels
Implementation Method 2
Each of the plurality of color filters may include a plurality of absorption films which are spaced from one another at predetermined intervals to absorb external light
Implementation Method 3
each of the plurality of lenticular lens units may include a plurality of lenticular lenses. The plurality of lenticular lenses may be arranged to correspond to a plurality of filter regions divided by the plurality of absorption films and to refract the external light toward the plurality of absorption films
Implementation Method 4
each of the plurality of micro lens units may include a plurality of micro lenses. The plurality of micro lenses may be arranged to correspond to the plurality of blocking films and to refract the external light toward the plurality of blocking films
Data Source
AI summary
A light emitting diode (LED) apparatus is provided. The LED apparatus includes: an LED layer including a plurality of LEDs corresponding to a plurality of sub-pixels; a phosphor layer which is stacked on a top of the LED layer and includes a phosphor corresponding to at least a part of the plurality of sub-pixels; and a filter layer which is stacked on a top of the phosphor layer and includes a plurality of color filters corresponding to the plurality of sub-pixels, and each of the plurality of color filters includes a plurality of absorption films which are spaced from one another at predetermined intervals to absorb external light.