Hybrid LED Backlight Module for Wide Color Gamut
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Solution Overview
Problem
Current LED backlights for LCD devices have a limited color gamut range, falling short of 70 to 80 percent of the standard color gamut, necessitating improvements in color reproducibility and range.
Innovation Solution
Incorporating monochromatic light sources, such as red light-emitting diodes, into LED bars on a light guide plate, with specific pixel width adjustments to enhance color gamut and avoid color distortion, alongside white light sources, to create a backlight module that improves color reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only white light sources are used in LED backlights, then the device structure is simple, but the color gamut range is limited to 70-80 percent of the standard
Solution Approach 1:
The patent combines white light sources with monochromatic light sources (red, green, blue LEDs) in the same light bar to create a hybrid backlight system. This merging approach allows the system to maintain the simplicity of white LED backlights while adding specific wavelength components to expand the color gamut range beyond the standard 70-80 percent limitation.
Solution Approach 2:
The patent applies local quality by introducing monochromatic light sources at specific positions within the light bar rather than uniformly across the entire backlight. The monochromatic LEDs are strategically placed to supplement specific color wavelengths where the white light sources are insufficient, thereby locally enhancing color gamut in critical spectral regions.
2Illumination intensity
If monochromatic light sources are added to expand color gamut, then color reproduction improves, but device complexity increases
Solution Approach 1:
The patent segments the backlight system into distinct functional units: white light sources for general illumination and monochromatic light sources for specific color enhancement. By dividing the light bar into segments with different LED types, the system achieves expanded color gamut while maintaining modular simplicity that limits overall complexity increase.
Solution Approach 2:
The light bar structure is designed to serve multiple functions simultaneously: white LEDs provide broad-spectrum illumination while monochromatic LEDs provide targeted wavelength supplementation. This multi-functionality allows a single integrated light bar to achieve both general lighting and color gamut expansion without requiring separate backlight systems.
3Manufacturing precision
If monochromatic light sources are used to enhance specific color reproduction, then color accuracy improves, but risk of color distortion increases
Solution Approach 1:
The patent implements a feedback mechanism where the control module monitors the output of both white and monochromatic light sources and dynamically adjusts their intensities. This feedback control ensures that when monochromatic LEDs are activated to enhance specific colors, the system automatically compensates to prevent over-saturation and color distortion, thereby maintaining color accuracy.
Solution Approach 2:
The patent employs dynamic control of light source intensities rather than fixed output levels. The control module can dynamically adjust the brightness and activation of individual monochromatic LED segments based on display content requirements, enabling precise color enhancement while avoiding static over-enhancement that would cause color distortion.
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 widens the color gamut range and enhances color reproducibility in display devices by optimizing the arrangement and intensity of monochromatic light sources within the backlight module, specifically improving red light reproduction while minimizing color distortion.
Implementation Method 1
both the monochromic light sources and the white light sources are light-emitting diodes
Implementation Method 2
the light bar is provided with white light sources, wherein the light bar is further provided with monochromic light sources
Data Source
AI summary
A backlight module includes a light guide plate and a light bar disposed on the light guide plate, with white light sources and monochromatic light sources having at least one color of N primary colors wherein N is greater than or equal to 3. A display device includes the backlight module, and a plurality of sub-pixels of different colors, with the width of sub-pixels of the at least one color being less than the width of sub-pixels of other colors.