Digital Sign Thermal Management via Internal Air Circulation
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Solution Overview
Problem
Digital signs face challenges in operating stably in low temperature environments due to increased heat generation from larger display panels and circuit units, leading to potential overheating and image degradation, and existing solutions require energy-intensive heating and cooling systems to maintain operational temperatures.
Innovation Solution
The digital sign employs a cooling structure with a circulation damper and fans to manage airflow within a case divided into two spaces, using temperature sensors to control the circulation and suction fans to maintain optimal temperature ranges, thereby reducing the need for external heating and minimizing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the display panel size is increased to provide varied content and messages, then the advertising capability is improved, but the heat generation increases causing overheating and image degradation
Solution Approach 1:
The case is divided into two separate spaces: a first space containing the display panel and a second space containing the circuit unit. This segmentation isolates the heat sources and allows independent temperature management for each component, enabling the display panel to maintain larger size without excessive heat accumulation affecting image quality.
Solution Approach 2:
A circulation fan is introduced as an intermediary device to actively manage heat transfer between the first space and the second space. The fan circulates air to distribute heat generated by the display panel to the circuit unit area, preventing localized overheating and maintaining optimal operating temperatures for both components.
2Reliability
If a fan and heater are employed to maintain operating temperature in seasonal outdoor environments, then the operational stability is improved, but the energy consumption significantly increases
Solution Approach 1:
The system uses its own internally generated heat from the circuit unit to warm the display panel during cold conditions, eliminating the need for external heaters. The circulation fan redistributes the heat already present in the system, allowing the display panel to self-regulate its temperature and maintain operational stability without additional energy-consuming heating devices.
Solution Approach 2:
The heat generated by the circuit unit, which would otherwise be wasted and contribute to overall system thermal management complexity, is converted into a beneficial resource. This internally generated heat is used to prevent the display panel from overheating and to maintain operational temperature during cold conditions, eliminating the need for separate heating and cooling systems.
3Temperature
If external air circulation is increased to cool the display panel, then the temperature control is improved, but the filter lifespan decreases due to continuous exposure to external environment
Solution Approach 1:
The circulation system creates different air circulation patterns in different locations: in the first space, air circulates locally around the display panel for cooling without requiring continuous external air intake, while the filter is positioned to only process air when necessary. This localized cooling approach maintains temperature control while minimizing filter exposure to external environmental contaminants.
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 the digital sign to maintain optimal operating temperatures without external heating, even in low-temperature environments, reducing energy consumption and extending filter lifespan by minimizing external air circulation.
Implementation Method 1
a circulation fan configured to induce flow of air in the case
Implementation Method 2
the display panel and a circuit unit configured to drive the display panel, wherein the case is provided with a first space and a second space, one side of the first space being connected to one side of the second space
Implementation Method 3
a circulation damper configured to open and close the other side of the first space and the other side of the second space
Data Source
AI summary
A digital sign and a method of driving a digital sign are provided. The digital sign may include a case, a display panel provided in the case, and a circuit unit to drive the display panel. An inner space of the case may include a first space and a second space, with a first end of the first space connected to a first end of the second space. A suction port may be formed in the case to guide external air into the inner space, and a discharge port may be formed in the case to discharge the air from the case. A circulation fan may be provided in the inner space to induce flow of air in the inner space, and a circulation damper may be disposed between second ends of the first space and the second space to open and close the second ends thereof. The air introduced through the suction port passes through the inner space of the case and is discharged through the discharge port when the circulation damper is closed, and the air circulates in the first space and the second space when the circulation damper is opened.