Projector Light Emission Control for White Balance Stability
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Solution Overview
Problem
Projectors using multiple light sources face challenges in maintaining appropriate white balance due to varying optical output characteristics, leading to complications when adjusting light emission amounts to change brightness, as this often results in unintended changes to white balance.
Innovation Solution
A projector system with multiple light sources, a modulator, a storage unit for grayscale and adjustment values, and a light-emission-amount adjusting unit that adjusts light emission based on pre-stored values to maintain appropriate white balance, allowing for precise control of light emission amounts and color balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light emission amounts of multiple light sources are changed to adjust brightness, then the brightness on the projection screen is improved, but the white balance changes in a complicated manner
Solution Approach 1:
The patent applies preliminary action by pre-storing adjustment values for each grayscale level in a storage unit before operation. When a grayscale is selected, the corresponding adjustment values are automatically retrieved and applied, eliminating the need for real-time complex calculations and ensuring accurate white balance maintenance during brightness adjustments.
Solution Approach 2:
The patent changes parameters by storing multiple sets of adjustment values corresponding to different grayscale levels. The system switches between these parameter sets based on the selected grayscale, allowing the light emission amounts to be adjusted in a coordinated manner to maintain white balance while changing brightness.
2Ease of operation
If the light emission amounts of light sources are adjusted to change brightness, then the brightness control is improved, but the complexity of white balance adjustment increases
Solution Approach 1:
The system performs preliminary action by pre-calculating and storing the optimal adjustment values for each grayscale level. This eliminates the need for complex real-time calculations during operation, simplifying the user interface while maintaining sophisticated white balance control through automated retrieval of pre-computed values.
Solution Approach 2:
The system applies self-service by automatically selecting and applying the appropriate adjustment values from the storage unit based on the selected grayscale. The light-emission-amount adjusting unit autonomously performs the complex coordination of multiple light source adjustments without requiring manual white balance calibration by the user.
3Illumination intensity
If multiple light sources are used to provide sufficient light output, then the illumination intensity is improved, but the uniformity of optical output characteristics deteriorates
Solution Approach 1:
The patent applies local quality by individually adjusting the light emission amount of each light source based on its specific characteristics. The storage unit contains separate adjustment values for each light source at different grayscale levels, allowing tailored compensation for variations in optical output characteristics while maintaining overall system performance.
Solution Approach 2:
The system changes parameters by applying different adjustment values to different light sources depending on the selected grayscale. This allows the optical output characteristics of each light source to be individually optimized at each grayscale level, compensating for non-uniformities while maintaining high illumination intensity.
Data Source
AI summary
A projector including: a plurality of light sources; a modulator that modulates light emitted from each of the plurality of light sources; a projection unit that projects the modulated light modulated by the modulator; a storage unit that stores grayscales of the light sources and adjustment values for adjusting the light emission amounts of the light sources in order to make white balance of the modulated light projected through the projection unit in relation to each other; and a light-emission-amount adjusting unit that adjusts the light emission amounts of the light sources based on the adjustment values corresponding to the grayscales of the light sources.