RGB LED Temporal Control for Brightness and Color Balance
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Solution Overview
Problem
Projection display apparatuses using solid light sources, such as light emitting diodes, face challenges in increasing light output while maintaining color reproducibility, as the ratio of red, green, and blue light intensities often deviate from the desired 3:7:1 ratio, leading to suboptimal image quality.
Innovation Solution
A light emission method and apparatus that utilize red, green, and blue light sources with adjustable light emission periods and intensities, where the light sources emit light in distinct periods and simultaneously, allowing for optimized light amount and color balance, ensuring high color reproducibility and increased brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If solid light sources (LEDs) are used to increase light output, then brightness is improved, but color reproducibility deteriorates due to deviation from the desired 3:7:1 ratio of red, green, and blue light intensities
Solution Approach 1:
The patent applies dynamics by making the light emission periods of red, green, and blue LEDs variable rather than fixed. The control device dynamically adjusts the emission periods of each color based on the desired color temperature and brightness requirements, allowing the system to adapt to different operating conditions and maintain optimal color reproducibility while maximizing brightness output.
Solution Approach 2:
The patent changes the parameter of light emission period duration for each color LED. By adjusting the emission periods of red, green, and blue LEDs independently, the system can control the overall light output and color characteristics. This parameter adjustment allows achieving both high brightness and accurate color reproduction by optimizing the temporal distribution of each color's emission.
2Manufacturing precision
If the light emission periods of red, green, and blue LEDs are adjusted to achieve desired color balance, then color reproducibility is improved, but light output control complexity increases
Solution Approach 1:
The patent merges the control of multiple LED colors into a unified control system. The control device integrates the adjustment of red, green, and blue LED emission periods into a single coordinated operation, managing all color balances and brightness levels through one centralized control mechanism, thereby reducing overall system complexity.
Solution Approach 2:
The control device implements feedback by monitoring the combined light output from red, green, and blue LEDs and adjusting their emission periods accordingly. This feedback mechanism ensures that the desired color temperature and brightness are achieved while automatically compensating for variations in LED performance, simplifying the control process.
3Adaptability or versatility
If white light is separated into three primary colors and chromatically synthesized again, then color image display is achieved, but device complexity and instantaneous lighting capability deteriorate
Solution Approach 1:
The patent segments the white light generation process into three independent single-color LED sources (red, green, blue) that operate in parallel. Each LED emits its specific color directly without requiring optical separation and recombination, eliminating the need for complex color separation filters, color wheels, or chromatic synthesis optical elements while maintaining full color display capability.
Solution Approach 2:
The patent extracts and eliminates the unnecessary optical components for color separation and synthesis from the system. By using three independent single-color LEDs, the invention removes color wheels, dichroic mirrors, and other complex optical elements, significantly simplifying the device structure while preserving color image display functionality.
4Ease of operation
If conventional white lamps are used, then ease of operation is maintained, but instantaneous lighting capability and portability deteriorate
Solution Approach 1:
The patent replaces the conventional thermal white lamp system with solid-state LED technology. LEDs are solid-state devices with no fragile filaments or glass envelopes, making them more durable, portable, and capable of instantaneous on/off operation. This substitution maintains ease of operation while dramatically improving response time and reducing warm-up periods.
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 enhances the light output while maintaining high color reproducibility by adjusting the light emission periods and intensities of the red, green, and blue light sources, achieving a balanced color ratio and improved image quality.
Implementation Method 1
a light source, called a solid light source such as a light emitting diode, emitting single-color light
Implementation Method 2
a hallow cylindrical rod integrator 32 formed from a glass column or laminated mirrors is used. In this rod integrator 32, light incident from an opening on the incidence side is totally reflected and reflected at the mirror surface repeatedly to propagate through the rod
Data Source
AI summary
In a light source emitting single-color light represented by a solid light source such as a light emitting diode, a light output is increased while a color reproducibility is maintained. A red, a green, and a blue light emitting diode are controlled so that a first light emitting step of making the red light emitting diode emit light in a first light emission period, a second light emitting step of making the green light emitting diode emit light in a second light emission period, a third light emitting step of making the blue light emitting diode emit light in a third light emission period, and a fourth light emitting step of making the red light emitting diode, the green light emitting diode and the blue light emitting diode emit light at the same time in a fourth light emission period are carried out for display of one image.