LED Luminance Stabilization via Dual-Temperature Control
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Solution Overview
Problem
Display devices with LED backlights face challenges in stabilizing luminance due to temperature variations, requiring a method to quickly and efficiently adjust LED luminance while considering both local and environmental temperatures.
Innovation Solution
A display device with a stabilizer that operates in two adjustment modes based on temperature differences between the LED region and the environment, using temperature sensors to switch between maximum luminance and target luminance settings, and controlling fans to manage heat effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the LED luminance is stabilized by gradually increasing the current value based on cathode potential, then the luminance stabilization is achieved, but the stabilization time is extended
Solution Approach 1:
The patent applies preliminary action by pre-measuring the temperature difference between the LED module and ambient environment before luminance stabilization. Based on this pre-acquired temperature information, the system determines the appropriate current increase rate in advance, allowing the LED current to be adjusted more efficiently from the start rather than using a fixed gradual increase, thus reducing overall stabilization time while maintaining reliability
Solution Approach 2:
The patent implements dynamics by making the current increase rate adaptive rather than static. The control circuit dynamically adjusts the LED current increase rate based on real-time temperature difference measurements. When the temperature difference is large, a slower increase rate is used to prevent damage, while when the temperature difference is small, a faster increase rate is applied to accelerate stabilization, thereby optimizing both reliability and time efficiency
2Loss of time
If the LED current is increased rapidly to reduce stabilization time, then the stabilization time is reduced, but the risk of LED damage due to overheating increases
Solution Approach 1:
The patent applies feedback by continuously monitoring the temperature difference between the LED module and ambient environment during the luminance stabilization process. The control circuit uses this temperature feedback to dynamically adjust the LED current increase rate in real-time. When temperature rises too quickly or exceeds safe thresholds, the current increase rate is automatically reduced or paused, preventing overheating damage while still progressing toward stabilization as quickly as safety allows
Solution Approach 2:
The patent implements parameter changes by varying the LED current increase rate parameter based on temperature conditions. Instead of using a fixed current ramp rate, the system changes the current increase rate parameter dynamically according to the measured temperature difference. This allows the system to optimize the balance between rapid stabilization and thermal safety by adjusting the current parameter in response to thermal conditions
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 approach allows for rapid stabilization of LED luminance, ensuring consistent display quality by considering environmental factors and reducing stabilization time compared to methods focused solely on local temperature.
Implementation Method 1
a first temperature sensor that measures a first temperature in a first region including a region where the light source is disposed in the housing
Implementation Method 2
a second temperature sensor that measures a second temperature in a second region different from the first region
Implementation Method 3
a light source that is provided in the housing, and includes an LED that irradiates the display panel with light
Data Source
AI summary
A display device includes a housing, a display panel, a light source, a first acquirer, a second acquirer, and a stabilizer. The display panel is provided in the housing. The light source is provided in the housing, and includes an LED that irradiates the display panel with light. The first acquirer acquires a first temperature in a first region including a region where the light source is disposed in the housing. The second acquirer acquires a second temperature in a second region different from the first region. The stabilizer has a first adjustment mode for lighting the LED with maximum luminance as an adjustment mode for stabilizing luminance of the LED. The stabilizer operates the LED in the first adjustment mode in a case where a temperature difference between the first temperature and the second temperature is a first threshold value or more.