Light Source Control Section for Projector Brightness and Temperature Management
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Solution Overview
Problem
Image display apparatuses, such as projectors, face a decrease in brightness due to temporal changes in light sources caused by aging, necessitating accurate control of light sources to maintain performance.
Innovation Solution
An image display apparatus equipped with a light source section, a first sensor to detect the state of emitted light, a second sensor to detect light source temperature, and a light source control section that adjusts the light source based on these detections to maintain constant intensity and suppress temperature increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light source is operated continuously to maintain image display, then the brightness may decrease due to aging, but increasing the light source power to compensate for brightness loss will cause temperature increase
Solution Approach 1:
The patent implements feedback control by monitoring the light source temperature and adjusting the drive current accordingly. The control unit receives temperature signals from the temperature sensor and modifies the light source drive current to maintain optimal operating conditions, preventing both overheating and brightness degradation.
Solution Approach 2:
The patent changes the operating parameters of the light source dynamically based on temperature conditions. By adjusting the drive current parameter in response to temperature sensor readings, the system optimizes brightness while preventing temperature-related degradation.
2Illumination intensity
If the light source drive current is increased to maintain brightness, then the brightness can be maintained, but the light source temperature increases causing aging
Solution Approach 1:
The temperature sensor provides continuous feedback on light source temperature, allowing the control unit to adjust drive current to prevent excessive heating that would accelerate aging. This feedback mechanism extends light source lifespan by maintaining optimal operating temperatures.
Solution Approach 2:
The system performs preliminary temperature monitoring and preemptive current adjustment before significant aging occurs. By detecting temperature trends early and adjusting drive current accordingly, the system prevents temperature-induced degradation and extends light source life.
3Measurement precision
If multiple sensors are added to monitor light source state and temperature, then accurate control is achieved, but the device complexity increases
Solution Approach 1:
The control unit serves multiple functions: it processes signals from both the first sensor (light source state) and second sensor (temperature), performs compensation calculations, and controls the light source drive current. This multi-functionality reduces the need for separate dedicated processing units.
Solution Approach 2:
The patent combines the signal processing functions for multiple sensors into a single control unit. By integrating the processing of light source state signals and temperature signals within one control unit, the system reduces overall device complexity while maintaining measurement precision.
Data Source
AI summary
An image display apparatus according to an embodiment of the present technology includes a light source section, a first sensor, a second sensor, and a light source control section. The light source section is capable of emitting emitted light. The first sensor is capable of detecting a state of the emitted light. The second sensor is capable of detecting a temperature of the light source section. The light source control section is capable of controlling the light source section according to a first detection result of detection performed by the first sensor, and a second detection result of detection performed by the second sensor.