Micro-LED Display Chromaticity Stabilization via Green Intensity Adjustment
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Solution Overview
Problem
Micro-LED display devices face challenges in maintaining consistent chromaticity of red color due to changes in light emission intensity, as the spectrum peak of micro-LEDs shifts with current levels, affecting the mixture of green and red spectra.
Innovation Solution
Incorporating a pixel structure with inorganic light-emitting diodes for red, green, and blue sub-pixels, where the green sub-pixel's light emission intensity is adjusted relative to the red sub-pixel's intensity within a low-luminance range to stabilize the chromaticity of red by adding a green component proportionally with the red gradation value, and using frame rate control for green emission to minimize intensity changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light emission intensity of the first sub-pixel (red) is increased, then the luminance is improved, but the chromaticity of red changes due to spectrum peak shift
Solution Approach 1:
The patent applies parameter changes by adjusting the light emission intensity of the green sub-pixel relative to the red sub-pixel based on the luminance level. When the red sub-pixel operates in the low-luminance range, the green sub-pixel's intensity is increased at a predetermined ratio to compensate for the chromaticity shift caused by the red sub-pixel's spectrum peak movement, thereby maintaining consistent red chromaticity across different luminance levels.
2Manufacturing precision
If the green sub-pixel intensity is increased to stabilize red chromaticity, then the chromaticity consistency is improved, but the overall color balance may be affected
Solution Approach 1:
The patent implements dynamics by dynamically adjusting the green sub-pixel's light emission intensity based on the red sub-pixel's luminance level. The control circuit modifies the green channel's drive current in real-time according to the red sub-pixel's operating conditions, creating a dynamic compensation mechanism that adapts to different luminance ranges while maintaining color balance.
Solution Approach 2:
The patent applies local quality by applying different intensity adjustment strategies to different luminance ranges. Specifically, the predetermined ratio for increasing green sub-pixel intensity is applied only when the red sub-pixel operates in the low-luminance range, while normal color balancing is maintained in other luminance ranges, thus locally optimizing chromaticity consistency without affecting overall color balance.
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 approach stabilizes the chromaticity of red across varying light emission intensities and ensures accurate color reproduction by adjusting the green and blue components accordingly, reducing the impact of intensity changes on the displayed color.
Implementation Method 1
A peak of a spectrum of light of a micro-LED may change with an amount of current applied thereto
Data Source
AI summary
According to an aspect, a display device includes a pixel including a first sub-pixel configured to emit light having a peak in a spectrum of red, a second sub-pixel configured to emit light having a peak in a spectrum of green, and a third sub-pixel configured to emit light having a peak in a spectrum of blue. The first sub-pixel, the second sub-pixel, and the third sub-pixel are inorganic light-emitting diodes. A light emission intensity of the second sub-pixel is increased at a predetermined ratio with respect to a light emission intensity of the first sub-pixel when the first sub-pixel emits light at a light emission intensity within a low-luminance range equal to or lower than a predetermined level of luminance.