Projection Device Brightness Control via Mode Switching
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Solution Overview
Problem
Current projection devices face issues with maintaining brightness and color stability over time due to the green-biased image caused by supplementary blue light excitation, leading to reduced overall conversion efficiency and heat sensitivity.
Innovation Solution
A projection device with an illumination system comprising multiple light sources driven by a control element that switches between modes based on optical and time states, adjusting luminous brightness to mitigate optical decay and maintain stability through different driving effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If supplementary blue light is used to excite green light to increase brightness, then brightness is improved, but the overall green energy ratio increases causing a green-biased image and reduced conversion efficiency
Solution Approach 1:
The driving element respectively drives the plurality of light sources in a first mode or a second mode... the driving element is switched from the first mode to the second mode according to a first signal
2Stability of the object's composition
If red light current and blue light current are increased to balance light colors and increase temperature, then color balance is improved, but the red light becomes more sensitive to heat causing saturation and reduced conversion efficiency
Solution Approach 1:
The driving element is switched from the first mode to the second mode according to a first signal... provides the first signal to the driving element according to an optical state or a time state of the projection device
3Productivity
If the projection device operates continuously to maintain brightness, then productivity is improved, but optical decay occurs over time reducing brightness stability
Solution Approach 1:
The driving element is switched from the first mode to the second mode according to a first signal... according to an optical state or a time state of the projection device
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 maintains good optical quality, improves brightness stability, and reduces color differences caused by attenuation, ensuring consistent performance over time.
Implementation Method 1
The light valve is disposed on a transmission path of the illumination light beam to convert the illumination light beam into an image light beam
Implementation Method 2
The projection lens is disposed on a transmission path of the image light beam to project the image light beam out of the projection device
Implementation Method 3
supplementary blue light is used to excite green light in order to increase brightness
Data Source
AI summary
A projection device, including an illumination system, a control element, a driving element, a light valve, and a projection lens, is provided. The illumination system includes multiple light sources for providing multiple light beams to be combined into an illumination light beam. The driving element respectively drives the light sources in a first mode or a second mode, so that the light beams have respective luminous brightness, and the driving element is switched from the first mode to the second mode according to a first signal. The control element provides the first signal to the driving element according to an optical state or a time state of the projection device. The light valve is adapted to convert the illumination light beam into an image light beam. The projection lens is adapted to project the image light beam out of the projection device.