Projection Display Lamp Voltage Detection for Illuminance Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing projection-type image display devices face issues with reducing image quality due to illuminance deterioration in discharge lamps, which current technologies fail to adequately compensate for, leading to decreased visibility and increased costs with optical sensor-based solutions.
Innovation Solution
A projection-type image display device equipped with a lamp voltage detection unit, image correction processing unit, and control unit that manages the lamp usage period to predict and correct illuminance deterioration, ensuring image quality by adjusting image correction based on detected lamp voltage and usage period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an optical sensor is used to detect deterioration in illuminating light, then image quality can be monitored, but device complexity and cost increase
Solution Approach 1:
The patent uses lamp voltage as an intermediary parameter to indirectly detect illuminance deterioration. Instead of directly measuring light output with an optical sensor, the system monitors voltage changes in the discharge lamp, which correlate with aging effects. This intermediary approach simplifies the detection system while maintaining measurement capability.
Solution Approach 2:
The patent replaces the optical measurement system with an electrical measurement system. By substituting optical sensors with voltage detection circuits, the system eliminates complex optical components while achieving the same detection objective through electrical parameter monitoring.
2Measurement precision
If an optical sensor is installed near the discharge lamp, then illuminance can be detected, but detection error occurs due to mounting position sensitivity
Solution Approach 1:
The patent introduces lamp voltage as an intermediary that mediates between the discharge lamp's aging state and the detection system. Voltage measurements are taken at standardized points in the circuit, eliminating the sensitivity to spatial positioning that plagues optical sensor approaches.
Solution Approach 2:
By replacing optical detection with electrical voltage measurement, the system eliminates geometric sensitivity entirely. Electrical measurements at circuit nodes are independent of physical positioning, thereby ensuring consistent and reliable detection results regardless of sensor location.
3Reliability
If lamp voltage detection is performed to control lamp drive circuit, then arc failure can be restrained, but deterioration in illuminance over time is not compensated
Solution Approach 1:
The patent implements preliminary action by proactively detecting voltage changes that indicate lamp aging before significant illuminance deterioration occurs. The system continuously monitors voltage and uses this information to predict future lamp performance, enabling preventive maintenance and compensation before the lamp fails or produces unacceptable light output.
Solution Approach 2:
The patent establishes a feedback loop where lamp voltage measurements are continuously fed back to the control system. This feedback enables real-time adjustment of lamp drive parameters and image processing corrections to compensate for aging effects, maintaining stable illuminance output throughout the lamp's operational life.
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 effectively maintains image quality by predicting and compensating for illuminance reduction, reducing visibility issues and costs associated with optical sensor errors, while providing a simple and accurate method for monitoring lamp deterioration.
Implementation Method 1
a lamp voltage detection unit configured to detect a voltage between electrodes (hereinafter, a lamp voltage) of the discharge lamp
Data Source
AI summary
This projection-type image display device is provided with: a lamp drive unit that drives a lamp; a lamp voltage detection unit that detects a lamp interelectrode voltage (hereinafter referred to as a lamp voltage); an image correction unit that corrects image qualities of image signals to be supplied to an image display element; and a control unit that controls a correction quantity of the image correction unit on the basis of the lamp voltage detected by means of the lamp voltage detection unit. Consequently, deterioration of visibility of a projection image can be suitably suppressed.