Display Device Red Green Pixel Emission Intensity Spectrum
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Solution Overview
Problem
Conventional red LEDs in display devices have lower luminous efficacy compared to blue and green LEDs, requiring higher drive currents and resulting in increased power consumption, and struggle to display vivid images due to a narrower light spectrum.
Innovation Solution
A display device incorporating red and green light emitting elements with specific emission intensity and spectrum characteristics, where the red light emitting element has a higher luminous efficacy and a broader spectrum, and the green light emitting element has a lower emission intensity and broader spectrum, allowing for improved color representation by combining their outputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional red LED is used to achieve red color display, then the red color can be displayed, but the luminous efficacy is lower and power consumption increases
Solution Approach 1:
The patent combines a red light emitting element and a green light emitting element within the same pixel to achieve red color display. The green light emitting element is driven at reduced intensity to produce a yellowish-green light that, when mixed with red light, creates a vivid red color perception while reducing overall power consumption compared to using only a high-power red LED.
Solution Approach 2:
The patent changes the emission intensity parameter of the green light emitting element relative to the red light emitting element. Specifically, the green element is operated at lower intensity (e.g., 30-70% of red element intensity), which alters the color mixing ratio to achieve vivid red display while minimizing energy consumption.
2Illumination intensity
If a conventional red LED with narrow spectrum is used, then red color can be displayed vividly, but the overall image quality and color representation deteriorates
Solution Approach 1:
The patent merges the spectral outputs of red and green light emitting elements to achieve both vivid red color and improved overall image quality. The green element contributes additional spectral content that enhances color rendering across the visible spectrum, making images appear more natural and less monochromatic while maintaining vivid red colors.
Solution Approach 2:
The patent applies local quality by having different light emitting elements within the same pixel serve different functions: the red element provides the primary red color with high intensity, while the green element provides supplementary spectral content at lower intensity, creating both vivid red and improved overall color representation simultaneously.
3Power
If higher drive current is applied to red LED to improve luminous efficacy, then light output increases, but power consumption increases
Solution Approach 1:
The patent combines light output from two elements with different efficiency characteristics. The green light emitting element operates at lower current with relatively high efficiency, contributing to overall light output without proportionally increasing power consumption, thereby reducing total power usage while maintaining adequate brightness.
Solution Approach 2:
The patent changes the operating current parameter of the green light emitting element to an optimized level (lower than the red element), which balances light output contribution with power consumption. This parameter optimization allows the green element to contribute meaningfully to total luminance without incurring high energy costs.
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
This configuration enhances image quality by reducing the vividness of red color and improving overall color representation, while minimizing power consumption by optimizing the drive current distribution across the light emitting elements.
Implementation Method 1
Each of the pixels includes a red light emitting element and a first green light emitting element
Implementation Method 2
When the first green light emitting element and the red light emitting element are turned on simultaneously, an emission intensity of the first green light emitting element is lower than an emission intensity of the red light emitting element
Data Source
AI summary
According to an aspect, a display device includes: a substrate; and a plurality of pixels provided on the substrate. Each of the pixels includes a red light emitting element and a first green light emitting element. When the first green light emitting element and the red light emitting element are turned on simultaneously, an emission intensity of the first green light emitting element is lower than an emission intensity of the red light emitting element, and a half width of a spectrum of light output from the first green light emitting element is greater than a half width of a spectrum of light output from the red light emitting element.