Alternating Electrode Drive Current for Projector Lamp
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Solution Overview
Problem
Projectors using discharge lamps for stereoscopic image projection face issues with electrode deformation and wear due to varying light intensity, leading to reduced brightness and increased power consumption, as well as crosstalk and flicker problems when alternating between right and left eye images.
Innovation Solution
A projector design that alternates the drive current to the discharge lamp's electrodes, providing greater energy to one electrode during one period and the other during the next, while maintaining a heat load balance to prevent deformation, and includes a state detecting section to adjust control periods based on the lamp's deteriorating state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the intensity of the light source is increased to make the picture appear bright, then the brightness of the projected image is improved, but the power consumption increases and the electrode deteriorates faster
Solution Approach 1:
The patent applies periodic action by alternating between two drive current patterns: a first pattern during periods when both active shutters are closed (reducing light output to extend electrode life), and a second pattern during periods when one shutter is open (increasing light output for brightness). This periodic switching resolves the contradiction by distributing the high-stress operating periods, thereby maintaining brightness when needed while reducing overall power consumption and electrode deterioration.
2Illumination intensity
If the intensity of the light source is increased to make the picture appear bright, then the brightness of the projected image is improved, but the electrode wear increases
Solution Approach 1:
The patent implements periodic action by switching between a first drive current pattern (lower intensity) during periods when both active shutters are closed, and a second drive current pattern (higher intensity) during periods when one shutter is open. This periodic modulation allows the electrode to undergo thermal cycling that prevents excessive wear during high-brightness periods while maintaining the necessary brightness output, thereby resolving the contradiction between brightness and electrode durability.
3Use of energy by moving object
If control to reduce brightness in periods when both active shutters are closed is performed, then power consumption is reduced, but the electrode temperature becomes insufficient for fusibility
Solution Approach 1:
The patent applies periodic action by implementing alternating drive current patterns: a first pattern with reduced intensity during periods when both active shutters are closed (reducing power consumption), and a second pattern with higher intensity during periods when one shutter is open (restoring electrode temperature for fusibility). This periodic switching resolves the contradiction by ensuring the electrode receives sufficient thermal energy during active display periods while consuming less power during inactive periods.
4Illumination intensity
If control to increase brightness in periods when one active shutter is opened is performed, then the picture appears bright, but the electrode may deform due to excessive temperature
Solution Approach 1:
The patent implements periodic action by switching between a first drive current pattern (lower intensity) during periods when both active shutters are closed, and a second drive current pattern (higher intensity) during periods when one shutter is open. This periodic modulation ensures that while brightness is maximized during active display periods, the electrode is given cooling periods when both shutters are closed, preventing excessive temperature accumulation and deformation.
5Reliability
If a period in which both active shutters are closed is provided to prevent crosstalk, then crosstalk is reduced, but the picture appears darker
Solution Approach 1:
The patent applies periodic action by implementing alternating drive current patterns: a first pattern during periods when both active shutters are closed (maintaining crosstalk prevention), and a second pattern during periods when one shutter is open (increasing brightness). The key innovation is that the drive current is modulated periodically to be higher during active display periods and lower during inactive periods, thereby resolving the contradiction between crosstalk prevention and picture brightness.
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 ensures a bright stereoscopic image projection while preventing electrode deformation and wear, reducing power consumption and crosstalk, and maintaining image quality by dynamically adjusting the drive current and control periods.
Implementation Method 1
a discharge lamp including a first electrode and a second electrode
Data Source
AI summary
A projector that outputs a first picture and a second picture alternately, wherein a control section performs first control and second control, controls a discharge lamp driving section. In the first control and the second control, the absolute value of a drive current is relatively small in a first period and relatively large in a second period. In the first control, the energy provided to a first electrode in the second period is greater than the energy provided to the second electrode in the second period. In the second control, the energy provided to the second electrode in the second period is greater than the energy provided to the first electrode in the second period.