Multi-peak LED Chip for High NTSC Backlight
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Solution Overview
Problem
Backlight-type display devices face challenges in achieving high NTSC levels due to the poor reliability of phosphor materials, especially in high temperature and humidity environments, and the need to reduce phosphor usage while maintaining color accuracy.
Innovation Solution
A light-emitting diode with a multi-color light emitting chip and a phosphor-containing layer, where the emission spectrum has distinct peaks for different primary colors with a significant wavelength difference, allowing for reduced phosphor usage and improved NTSC levels through the use of a single-color phosphor, such as a red-light phosphor, and combining RGB filters for enhanced color accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple phosphors are used to achieve high NTSC levels, then color gamut coverage is improved, but phosphor reliability deteriorates due to poor performance in high temperature and humidity environments
Solution Approach 1:
The patent extracts and eliminates the need for multiple phosphors by using a single blue light phosphor (Y3Al5O12:Ce, YAG:Ce) in combination with a multi-peak LED chip. The multi-peak chip structure (with peaks at 450nm, 530nm, and 630nm) replaces the function of multiple phosphors, thereby removing unreliable phosphor materials from the system while maintaining high NTSC levels.
Solution Approach 2:
The patent changes the spectral parameters of the light source by using a LED chip with multiple emission peaks at specific wavelengths (450nm±5nm, 530nm±5nm, 630nm±5nm). This parameter change in the light source characteristics allows the system to achieve high color gamut coverage without relying on multiple phosphors, thus improving reliability.
2Reliability
If direct-lit backlight source is used to achieve better picture quality and higher contrast, then display performance is improved, but device thickness increases making it unfavorable for lightness and thinness
Solution Approach 1:
The patent changes the optical parameters of the backlight system by using a multi-peak LED chip with specific wavelength emissions that can be effectively filtered by RGB color filters. This allows the use of a thinner backlight structure while maintaining high picture quality and contrast, as the optimized spectral distribution enables more efficient light utilization through the color filters.
3Reliability
If RGB three-primary-color direct display is used, then display effect is improved, but cost increases
Solution Approach 1:
The patent merges multiple functions into a single component by using a multi-peak LED chip that integrates the functions of multiple light sources (blue, green, and red emitters) into one chip. This consolidation eliminates the need for separate phosphor materials and simplifies the manufacturing process, thereby reducing cost while maintaining the display effect of RGB direct display.
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 enables a high NTSC level in backlight-type display devices by optimizing the emission spectrum of the light-emitting diode and using a single-color phosphor with high reliability, improving color purity and brightness while reducing phosphor usage, thus enhancing the display's color gamut and reliability.
Implementation Method 1
The phosphor-containing layer is disposed covering/over the multi-color light emitting chip and configured (i.e., structured and arranged) to be excited (e.g., by light emitted from the multi-color light emitting chip) to emit a third primary-color light
Data Source
AI summary
A light-emitting diode (LED) and a backlight-type display device are provided. The light-emitting diode includes: a multi-color light emitting chip, an emission spectrum thereof including a first peak in a wavelength range of a first primary-color light and a second peak in a wavelength range of a second primary-color light, and an absolute value of a wavelength difference between the first and second peaks being greater than 50 nm; and a phosphor-containing layer, disposed over the multi-color light emitting chip and used to be excited to emit a third primary-color light. Owing to the LED adopts the multi-color light emitting chip which has the first and second peaks in different wavelength ranges and the absolute valve of the wavelength difference is greater than 50 nm, RGB three-primary-color lights can be outputted by adopting a single-color light phosphor powder with relatively high reliability. The backlight-type display device can obtain a high NTSC level.