Projection Display Brightness Control via Feedback
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Solution Overview
Problem
Existing projection display technologies do not adequately consider the actual brightness of modulated light, leading to inefficient image projection.
Innovation Solution
A projection display apparatus comprising a light source, spatial light modulator, data adjuster, light amount adjuster, light sensor, image analyzer, and brightness restricting unit, which adjusts the upper limit of brightness to match target values based on detected light, ensuring optimal image projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light amount is increased to improve image brightness, then the brightness of the projected image is improved, but the actual brightness of the modulated light is not adequately controlled leading to inefficiency
Solution Approach 1:
The patent implements a feedback control system where a light sensor detects the actual brightness of the modulated light, and this detection information is fed back to the control unit. The control unit adjusts the light amount based on the difference between the detected brightness and the target brightness, ensuring efficient and accurate brightness control of the projected image.
Solution Approach 2:
The patent replaces manual or open-loop mechanical light amount adjustment with an automated control system that uses electronic feedback from the light sensor. This substitution enables precise, dynamic adjustment of the light amount based on actual brightness conditions, improving both efficiency and accuracy.
2Adaptability or versatility
If the light amount is adjusted without considering actual brightness, then the light amount can be changed freely, but the brightness control accuracy deteriorates
Solution Approach 1:
The feedback control system continuously monitors the actual brightness through the light sensor and adjusts the light amount accordingly. This ensures that while the system remains flexible in adjusting light amounts, the brightness control accuracy is maintained by constantly comparing actual brightness with target brightness and making corrective adjustments.
Solution Approach 2:
The system performs self-adjustment of the light amount based on feedback from the light sensor. The control unit automatically corrects brightness deviations without external intervention, maintaining both flexibility and precision in brightness control.
3Measurement precision
If a light sensor and feedback control system are added to improve brightness control, then the brightness control accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent introduces a light sensor and feedback control mechanism to achieve accurate brightness control. While this does increase device complexity, the added components enable precise measurement and control of the actual brightness of modulated light, resolving the technical contradiction between control accuracy and system simplicity.
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
This solution allows for varying the light amount while maintaining appropriate brightness, enhancing image contrast and dynamic range by controlling the light amount adjuster to match target brightness values, thus addressing the inefficiencies in existing technologies.
Implementation Method 1
The light sensor is configured to detect brightness of the image projection light adjusted by the light amount adjuster
Implementation Method 2
The spatial light modulator is configured to modulate, according to given control data, light emitted from the light source into image projection light to project an image
Data Source
AI summary
Display an image by adjusting upper limit of brightness of the image projection light. Here, determine the target value, according to analysis result of the image data, for the detected brightness of the image projection light, and adjust the upper limit of brightness of the image projection light to cause the detected brightness to approach the target value.