Image Display Device Light Quantity Control
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Solution Overview
Problem
Image display apparatuses face challenges in maintaining a desired light quantity due to temporal deterioration of semiconductor light sources or changes in usage environments, as existing methods for correcting voltage/light quantity characteristics are limited by insufficient measurement data during short flyback periods.
Innovation Solution
An image display apparatus with a light source control unit, light quantity measurement unit, and power/light quantity characteristic derivation unit that gradually changes the light quantity of the source light, allowing for accurate data acquisition and real-time adjustment to maintain desired image brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the voltage/light quantity characteristic review is carried out during the flyback period, then the user does not see the light quantity change, but the measurement data is insufficient due to the short duration
Solution Approach 1:
The patent applies preliminary action by performing the voltage/light quantity characteristic review during the warm-up period before normal operation begins. This allows sufficient measurement time to be allocated to the characteristic review process, ensuring accurate measurement data is collected before the system transitions to its operational state where the flyback period would be too short for adequate measurement.
2Manufacturing precision
If the applied voltage is changed to correct the voltage/light quantity characteristic, then the light quantity can be adjusted, but the user perceives the light quantity change during the adjustment process
Solution Approach 1:
The patent applies preliminary action by completing the voltage/light quantity characteristic review and correction during the warm-up period before normal operation begins. This timing ensures that the voltage adjustment is performed when the user is not actively viewing the display, preventing the user from perceiving the light quantity change during the correction process.
Solution Approach 2:
The patent applies the skipping principle by rapidly transitioning through the measurement and correction processes during the warm-up period. The system quickly completes the voltage/light quantity characteristic review and applies corrections before the flyback period begins, minimizing the time the user would be exposed to visible light quantity changes.
Data Source
AI summary
An image display apparatus includes a light source device, a light source control unit which controls power supplied to the light source device and an image light emission unit which, utilizing a source light emitted from the light source device, emits an image light. A light quantity measurement unit measures a quantity of the source light. A power/light quantity characteristic derivation unit derives a power/light quantity characteristic. A light quantity adjustment unit, based on the power/light quantity characteristic, adjusts the quantity of the source light or the image light. The light source control unit controls the supplied power to gradually change the light quantity of the source light. The light quantity measurement unit measures the light quantity of the gradually changing source light and acquires light quantity data. The power/light quantity characteristic derivation unit, based on the light quantity data and the supplied power, derives the power/light quantity characteristic.