Laser Display Power Control for Natural Color
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Solution Overview
Problem
Conventional image display apparatus using lamp light sources face issues with short lifetime, limited color reproducibility, and low light use efficiency, while laser image display devices improve on these but lack methods to enhance image quality within their broader color reproducible regions.
Innovation Solution
A laser image display device employing three laser light sources with specific wavelength ranges (620-700 nm, 500-550 nm, and 430-470 nm) and a color output conversion controller to dynamically control laser beam powers, ensuring colors are within the reproducible region without relying solely on maximum red laser power, thereby reducing uncomfortable monochromatic stimulation and enhancing natural color representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the laser image display device uses the maximum power of the red laser beam to display the red primary color, then the color reproducible region is enlarged, but the displayed color becomes unnatural and causes uncomfortable monochromatic stimulation
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the power ratios of multiple laser beams (red, green, blue) rather than using fixed maximum power settings. The controller varies the relative intensities of different wavelength laser beams to achieve natural-looking colors while maintaining broad color gamut coverage, thereby resolving the contradiction between color reproducible region and monochromatic stimulation discomfort
Solution Approach 2:
The patent uses composite light sources by combining multiple laser beams of different wavelengths (red, green, and blue laser beams) to create composite colors. Instead of relying on single-wavelength monochromatic light, the system superimposes multiple laser beams with controlled power ratios to produce natural-looking composite colors that cover a broad color reproducible region while avoiding monochromatic stimulation discomfort
2Measurement precision
If the laser image display device uses only the red laser beam at maximum power to display red, then the color purity is high, but the image quality becomes unnatural
Solution Approach 1:
The patent applies partial action by using the red laser beam at maximum power only when absolutely necessary (at specific chromaticity coordinates), and using other laser beams at partial powers for most color display situations. This approach maintains high color purity where needed while achieving natural image quality through combined laser beam illumination in other scenarios
Solution Approach 2:
The controller dynamically changes the power parameters of different laser beams based on the required chromaticity coordinates. By adjusting the relative power ratios of red, green, and blue laser beams, the system achieves both high color purity when required and natural image quality for overall display, resolving the contradiction between color purity and image quality
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 achieves a broader color reproducible region and natural color representation for viewers by balancing laser beam powers, reducing uncomfortable feelings associated with monochromatic light, and enabling vivid image display.
Implementation Method 1
a first laser light source which can emit a first laser beam having a first wavelength; a second laser light source which can emit a second laser beam having a second wavelength
Data Source
AI summary
A laser image display device includes: a first laser light source capable of outputting a laser light having a first wavelength; a second laser light source capable of outputting a laser light having a second wavelength; and a color output conversion controller capable of individually controlling power of the first and the second laser light source displaying the pixels constituting an image according to an input signal. When an input signal is contained at the end point of the color reproducible region and the laser light having the first wavelength is driven substantially by a first maximum power while the laser light having the second wavelength is driven substantially by a second minimum power, the color output conversion controller displays in pixels, a color contained in the color reproducible region excluding the end point in the pixels by using the laser light of the first wavelength at a first power below the first maximum power and the laser light of the second wavelength at a second power above the second minimum power.