Color Wheel Segment Width Adjustment for Dynamic Color Balance
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Solution Overview
Problem
Conventional projection technologies face challenges in adjusting color balance and brightness due to fixed color filter arrangements in color wheels, limiting their ability to adapt to changes in transmission wavelength characteristics and user preferences.
Innovation Solution
A data projector apparatus using a color wheel with a semiconductor laser for blue light and an LED for red light, where the emission timing of each light source and the rotation of the color wheel are controlled to adjust the duration of blue, green, and red light periods, allowing for flexible color mode settings such as normal, green-emphasized, and luminance-emphasized modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single light source and fixed color wheel are used, then the device complexity is reduced, but the adaptability to adjust color balance and brightness is lost
Solution Approach 1:
The patent applies dynamics by making the color wheel segments adjustable in width. The color wheel is divided into multiple segments with variable central angles, allowing the duration of each color period to be dynamically changed. This enables adaptation to different color balance requirements while using a single light source, resolving the contradiction between device simplicity and adaptability.
Solution Approach 2:
The patent changes the parameter of color segment width (central angle) to achieve different color balance configurations. By adjusting the central angles of color filters or fluorescent regions on the color wheel, the system can adapt to various color reproduction needs, transmission wavelength characteristics, and user preferences without adding more light sources.
2Manufacturing precision
If the central angle of each color filter is fixed, then the manufacturing precision is simplified, but the ability to cope with transmission wavelength band changes and user preferences is lost
Solution Approach 1:
The patent implements dynamics by designing the color wheel with adjustable segment widths. The central angles of different color segments can be varied to change the duration of each color period, enabling the system to adapt to transmission wavelength band changes and user preferences while maintaining a relatively simple manufacturing process.
Solution Approach 2:
The color wheel is segmented into multiple color regions with independently adjustable widths. This segmentation allows each color period to be optimized separately, enabling flexible adjustment of color balance and brightness while keeping the overall structure simple and manufacturable.
3Device complexity
If a single light source is used, then the device complexity is reduced, but the productivity in terms of color reproduction quality is limited
Solution Approach 1:
The patent uses dynamics to optimize image quality with a single light source by dynamically adjusting the color wheel segment widths. This allows the system to maximize color reproduction quality and brightness by allocating appropriate time durations to each color period, achieving high productivity without increasing device complexity.
Solution Approach 2:
The system employs periodic action by rotating the color wheel to sequentially present different color segments to the light source. By optimizing the period duration of each color segment through adjustable central angles, the system achieves high-quality color reproduction and brightness, improving productivity while maintaining a simple single-light-source configuration.
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
Enables dynamic adjustment of color balance and brightness, improving image quality by allowing longer projection times for green light to emphasize luminance and enhance overall image brightness.
Implementation Method 1
a blue light transmission diffusion plate 24B, and a green fluorescent reflection plate 24G are formed into a ring
Implementation Method 2
a green fluorescent reflection plate 24G are formed into a ring-like shape at a predetermined position
Implementation Method 3
an LED 21 emitting red light
Data Source
Figure 1
Figure 2
Figure 3A~3C
AI summary
There is provided a light source device including a first light source (20) for emitting light in a first wavelength band, light-source light generation means (24, 25) for generating light of each of a plurality of colors by time division by using the first light source (20), a second light source (21) for generating light of a second wavelength band different from the first wavelength band, and light source control means (31) for causing each of the light-source light generation means (24, 25) and the second light source (21) to generate light in one period, and controlling a drive timing of each of the first and second light sources (20, 21) to adjust a light-emission timing and a light-emission period of light generated by each of the light-source light generation means (24, 25) and the second light source (21).