Light Source Driving Method for Projection Apparatus
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Solution Overview
Problem
Projection apparatuses with dual-lamp structures consume high power while trying to achieve high brightness, and existing methods do not effectively reduce power consumption or improve image uniformity.
Innovation Solution
A light source driving method that controls multiple color light sources to turn on and off in specific sub-frame periods, redistributing their operation time to reduce overall power consumption and enhance image uniformity, allowing for efficient use of power sources including batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a dual-lamp structure is used to increase brightness, then the image brightness is improved, but the power consumption increases
Solution Approach 1:
The patent applies periodic action by dividing the frame time into multiple sub-frames and controlling different light source assemblies to operate in alternating sequences. Specifically, the first light source assembly operates in odd-numbered sub-frames (1st, 3rd, 5th...) while the second light source assembly operates in even-numbered sub-frames (2nd, 4th, 6th...), creating a periodic operation pattern that reduces overall power consumption while maintaining image brightness through temporal multiplexing
Solution Approach 2:
The patent segments the operation of light source assemblies by dividing the frame time into multiple sub-frames and assigning different light sources to different time intervals. The first light source assembly with first and third color light sources operates in certain sub-frames while the second light source assembly with second color light sources operates in other sub-frames, effectively segmenting the total operation time to reduce cumulative power consumption
Data Source
AI summary
A light source driving method for controlling a first and a second light source assembly of a projection apparatus to turn on and off at least once during each 1/n frame time is provided. The first light source assembly includes first color light sources and third color light sources, while the second light source assembly includes second color light sources. The light source driving method includes following steps: turning on and off the first color light sources once sequentially in a first sub-frame period; turning on and off a part of the second color light sources once synchronously in a second sub-frame period; turning on and off the other second color light sources once synchronously in a third sub-frame period; and turning on and off the third color light sources once sequentially in a fourth sub-frame period.