LCD Center Temperature Control via Edge Measurement
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Solution Overview
Problem
Existing LCD thermal management systems fail to accurately regulate the temperature at the center of the display, leading to suboptimal heating and potential overheating, as they rely on edge temperature measurements that do not account for the temperature gradient across the panel, resulting in issues with luminance, contrast, and response time, especially at low ambient temperatures.
Innovation Solution
A temperature regulation framework that utilizes a digital analog converter (DAC) and a heat input look-up table (LUT) to calculate and maintain the center temperature of the LCD, ensuring accurate heat control by determining the temperature delta between the center and edge, thereby preventing overheating and optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If temperature sensors are positioned at the edge of the LCD panel to measure temperature, then the device complexity is reduced and ease of operation is improved, but the measurement precision deteriorates because edge temperature does not accurately represent center temperature
Solution Approach 1:
The patent introduces an intermediary computational model that translates edge temperature measurements into center temperature estimates. The control unit uses a thermal gradient model as an intermediary to infer the center temperature from the easily measurable edge temperature, thereby maintaining measurement ease while achieving accurate center temperature control.
Solution Approach 2:
The patent creates a virtual copy of the temperature field by using a thermal gradient model to replicate the relationship between edge and center temperatures. This computational copy allows the system to predict center temperature based on edge measurements without physically placing sensors at the center location.
2Device complexity
If heating is controlled based on edge temperature measurements, then the device complexity is reduced, but the reliability deteriorates due to temperature gradient causing suboptimal heating and potential overheating at the center
Solution Approach 1:
The patent implements a feedback control loop where the control unit continuously monitors edge temperature, computes the corresponding center temperature using the thermal gradient model, and adjusts heating power accordingly. This feedback mechanism ensures reliable center temperature control while maintaining relatively simple device architecture.
Solution Approach 2:
The patent dynamically changes the heating control parameters based on the computed center temperature. By adjusting the heating power level according to the thermal gradient model predictions, the system maintains reliable temperature control without requiring complex multi-sensor arrays or sophisticated control hardware.
3Manufacturing precision
If edge temperature is used for heating control, then manufacturing precision requirements are reduced, but the loss of energy increases due to suboptimal heating and potential overheating
Solution Approach 1:
The patent applies preliminary computational processing to edge temperature measurements to predict center temperature before adjusting heating. This preliminary action of calculating the thermal gradient relationship allows the system to optimize heating energy usage by preventing both underheating and overheating scenarios, thereby reducing energy waste.
Solution Approach 2:
The patent replaces the need for precise physical sensor placement (mechanical precision requirement) with a computational approach. By substituting the mechanical complexity of multiple precisely-placed sensors with a software-based thermal gradient model, the system reduces manufacturing precision requirements while simultaneously optimizing energy efficiency through accurate temperature control.
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 ensures optimal luminance, contrast, and response time by accurately maintaining the desired temperature at the center of the LCD, preventing damage and reducing power consumption, while effectively addressing the temperature gradient issue.
Implementation Method 1
direct contact of optically transparent electrically conductive material on the front color plate may facilitate conductive heat transfer to the liquid crystal layer
Implementation Method 2
at least one thermistor or other suitable device for measuring display temperature may be in electronic communication with a control unit
Data Source
AI summary
A liquid crystal display (LCD) having a temperature regulation framework which utilizes a digital to analog converter. The thermal management system involves display heating controlled based on temperature values calculated for the center of the display.