Discharge Lamp Driver Control for Stereoscopic Projector Brightness
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Solution Overview
Problem
Projectors using discharge lamps face issues with electrode wear and reduced brightness when projecting stereoscopic video images, as simply increasing light intensity leads to increased power consumption and further degradation of components.
Innovation Solution
A projector that alternately switches between right-eye and left-eye video images, using a discharge lamp driver controlled to supply varying drive currents, with AC current during specific periods to reduce electrode wear and maintain brightness, and adjusts drive power based on detected voltage to match the state of the electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the drive electric power is increased to make stereoscopic video images appear brighter, then the brightness of projected images is improved, but power consumption increases and electrode wear accelerates
Solution Approach 1:
The patent applies periodic action by dividing the drive period into first periods (when both active shutters are closed) and second periods (when at least one active shutter is open). During second periods, the drive electric power is increased to compensate for light loss, while during first periods, lower power is used. This periodic variation in drive power allows the system to maintain adequate brightness during active display periods while reducing overall power consumption and electrode wear during inactive periods.
2Illumination intensity
If the drive electric power is increased to make stereoscopic video images appear brighter, then the brightness of projected images is improved, but the wear of electrodes accelerates
Solution Approach 1:
The patent applies periodic action by dividing the drive period into first periods (when both active shutters are closed) and second periods (when at least one active shutter is open). During second periods, the drive electric power is increased to compensate for light loss, while during first periods, lower power is used. This periodic variation in drive power allows the system to maintain adequate brightness during active display periods while reducing overall power consumption and electrode wear during inactive periods.
3Illumination intensity
If the intensity of light from the light source is changed in synchronization with video signal, then the color reproduction is improved, but the wear of electrodes accelerates
Solution Approach 1:
The patent applies local quality by applying different drive electric power levels to different time periods based on the operational state of the active shutters. Specifically, high drive power is applied locally during second periods when shutters are open and light is needed, while low drive power is applied during first periods when shutters are closed. This localized control of light intensity ensures color reproduction quality when needed while minimizing electrode wear during inactive 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
The solution allows for brighter stereoscopic video images while minimizing electrode wear and reducing power consumption, effectively addressing the challenges of brightness and component degradation.
Implementation Method 1
a discharge lamp 90... a discharge lamp driver 230 that supplies the discharge lamp 90 with a drive current for driving the discharge lamp 90
Data Source
AI summary
A projector includes a discharge lamp, a discharge lamp driver that supplies the discharge lamp with a current, a voltage detector that detects a drive voltage for driving the discharge lamp, and a controller that controls the discharge lamp driver. The controller carries out a first control process in which the discharge lamp driver is so controlled that an absolute magnitude of the drive current in a first period is smaller than that in a second period and that an AC current is supplied to the discharge lamp in a second period. The first control process includes a first electric power control process in which first average drive electric power is determined based on the voltage detected by the voltage detector and a current is supplied to the discharge lamp in such a way that average drive electric power is set at the first average drive electric power.