Projection Display Low-Temperature Startup Control
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Solution Overview
Problem
Projection display devices face operational issues when started up in low temperatures, as key components may malfunction and fail to recover even after temperature normalization, due to temperature variations in diverse environments.
Innovation Solution
Incorporating a heating unit, temperature detecting unit, and control unit in the display device to gradually raise the environmental temperature to the required starting-up temperature before initiating operations, with the heating unit, such as a built-in lamp, and temperature sensors providing temperature feedback to the control unit for normal startup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the projection display device is started up directly in low temperature environment, then the startup process is simple and fast, but the key components may malfunction and fail to recover even after temperature normalization
Solution Approach 1:
The patent applies preliminary action by implementing a temperature detection mechanism that checks the environmental temperature before allowing device startup. The control unit detects temperature via a sensor and prevents startup until the temperature reaches the required threshold, ensuring components are not subjected to damaging low-temperature conditions from the outset.
Solution Approach 2:
The patent implements feedback through a closed-loop temperature monitoring system. The temperature detection unit continuously monitors the environmental temperature and provides feedback to the control unit, which adjusts the startup permission accordingly. This feedback mechanism ensures that the device only starts when temperature conditions are suitable, preventing component malfunction.
2Reliability
If a heating unit and temperature detection system are added to raise temperature before startup, then component reliability is improved, but the device complexity and startup time increase
Solution Approach 1:
The patent applies self-service by utilizing the device's own built-in lamp as a heating element to raise the internal temperature. Rather than requiring an external heating device, the system uses its existing component (the lamp) to warm the environment inside the device housing, thereby reducing the need for additional dedicated heating equipment and minimizing startup time overhead.
Solution Approach 2:
The patent implements multi-functionality by enabling the lamp to serve dual purposes: as the primary light source for projection and as a heating element to warm the device interior during cold conditions. This universal use of the lamp eliminates the need for separate heating components, reducing system complexity while maintaining reliability.
3Device complexity
If the built-in lamp is used as a heating unit, then additional heating components are eliminated, but the lamp's primary function as a light source may be compromised
Solution Approach 1:
The patent applies periodic action by controlling the lamp to operate in alternating modes: during cold conditions, the lamp is activated periodically or continuously as a heating element to raise the internal temperature; once the temperature threshold is reached, the lamp's heating function is discontinued and its primary illumination function is activated for normal projection operation. This temporal separation of functions ensures the lamp effectively heats without compromising light source quality during actual use.
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
Ensures the projection display device can be started up and operated normally in low-temperature environments by efficiently raising the temperature to the required level, preventing abnormal component behavior and ensuring consistent functionality.
Implementation Method 1
the heating unit, such as a built-in lamp, and temperature sensors providing temperature feedback to the control unit for normal startup
Implementation Method 2
the temperature detecting unit is utilized to detect the environmental temperature in the display device and to generate a temperature signal to the control unit
Data Source
AI summary
A display device and a method for starting up at a low temperature utilizing a heating unit of the display device or an external heating unit to increase the environmental temperature of the display device are disclosed. After the environmental temperature inside the display device reaches a starting-up temperature, the display device can be started up in the low-temperature environment.