LED Temperature Control via Dynamic Current Adjustment
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Solution Overview
Problem
Liquid crystal displays face issues with light emission instability due to excessive high or low temperatures, leading to abnormal image displays, as the efficiency of light emitting diodes (LEDs) varies significantly with temperature, failing to meet brightness regulations.
Innovation Solution
A temperature control method for LEDs that involves using a thermosensitive temperature transducer to acquire the current temperature and adjust the driving electric current based on a pre-defined temperature versus electric current relationship, either reducing or increasing the current depending on the temperature threshold to maintain stable light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the LED operates at high temperature, then the light emission efficiency declines, but the temperature control complexity increases
Solution Approach 1:
The patent implements a feedback control mechanism where a temperature transducer continuously monitors the LED temperature and feeds this information to a driving module that adjusts the driving current accordingly. This closed-loop feedback system automatically maintains optimal light emission efficiency by compensating for temperature variations without requiring complex external control systems.
Solution Approach 2:
The LED system performs self-temperature-control through integrated temperature sensing and automatic current adjustment. The temperature transducer and driving module work together to enable the LED to self-regulate its operating conditions, eliminating the need for separate complex temperature control apparatus and reducing overall system complexity.
2Illumination intensity
If the LED operates at low temperature, then the light emission efficiency increases excessively, but the brightness regulation compliance deteriorates
Solution Approach 1:
The feedback control mechanism monitors temperature and adjusts driving current to prevent excessive light emission efficiency at low temperatures. When the temperature transducer detects low temperature conditions, the driving module reduces the driving current to ensure brightness remains within regulatory requirements, maintaining reliability and compliance.
Solution Approach 2:
The system dynamically changes the driving current parameter based on temperature conditions. By adjusting this electrical parameter in response to temperature variations, the system maintains brightness within acceptable ranges while optimizing light emission efficiency, ensuring compliance with brightness regulations across different operating temperatures.
3Speed
If temperature control is implemented through threshold comparison, then the response speed increases, but the temperature control precision decreases
Solution Approach 1:
The patent pre-stores multiple sets of driving current parameters corresponding to different temperature ranges in the driving module. When the temperature transducer detects a temperature change, the system quickly retrieves the appropriate pre-calculated current parameters and applies them, achieving fast response without requiring complex real-time calculations or continuous fine-tuning.
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 method stabilizes light emission efficiency by dynamically adjusting the driving current, thereby improving image quality by preventing excessive brightness or dimness caused by temperature fluctuations.
Implementation Method 1
acquiring the present temperature of the LED by means of a temperature transducer during the light emission of the LED
Data Source
AI summary
A temperature control method for light emitting diode (LED) is disclosed, and the method comprises the following steps: acquiring the present temperature of the LED during the light emission of the LED; obtaining a driving electric current corresponding to the present temperature based on the present temperature of the LED; and driving the LED based on the driving electric current. This invention further discloses a temperature control device for the LED and a liquid crystal display.