LED Display Heat Map Luminance Control for Thermal Aging
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Solution Overview
Problem
LED displays, particularly OLED displays, are sensitive to temperature and age faster in high temperatures, with differential ageing of different colors causing shifts in the white point of the display over time, and existing temperature compensation methods are inefficient due to averaging device temperatures rather than specific display areas.
Innovation Solution
A method involving temperature sensors on or near the display to generate a heat map, adjusting luminance based on the heat map to manage temperature-related aging by reducing current in areas exceeding operational specifications, ensuring consistent aging across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional light bulb is used, then the device is simple and inexpensive, but the luminous intensity is insufficient and the service life is limited
Solution Approach 1:
A conversion device is introduced as an intermediary component between the power supply and the LED array. This conversion device includes a controller that receives control signals and converts them into appropriate driving signals for the LEDs, enabling precise control of luminous intensity while maintaining system simplicity through modular design
Solution Approach 2:
The lighting system is divided into multiple independent LED units that can be individually controlled. Each LED or group of LEDs can be addressed separately through the conversion device, allowing selective illumination of different regions and providing granular control over overall luminous intensity
2Duration of action of stationary object
If a conventional light bulb is used, then the device structure is simple, but the service life is limited to about 1000 hours
Solution Approach 1:
The conversion device serves as a protective intermediary that provides current regulation and protection circuits to prevent overcurrent damage to LEDs. It also manages thermal characteristics and provides fault detection, thereby extending LED service life while keeping the overall system architecture relatively simple through functional integration
Solution Approach 2:
The LED system incorporates self-diagnostic capabilities through the conversion device that can detect faults in individual LEDs or groups. The system automatically identifies and isolates defective units, allowing the remaining healthy LEDs to continue operating, thus extending the effective service life of the lighting system
3Measurement precision
If individual LEDs are controlled independently, then the control precision is high, but the number of control signals required increases significantly
Solution Approach 1:
The conversion device is designed with multi-functional capabilities to control multiple LED units through a single control interface. It can selectively activate different groups of LEDs, adjust their individual intensities, and provide various lighting modes (sequential, simultaneous, dimming) through unified control signals, thereby maintaining high control precision while minimizing the number of required control lines
Solution Approach 2:
Multiple control functions are merged into a single conversion device that handles current regulation, pulse width modulation, fault detection, and group addressing. This consolidation allows precise control of individual LEDs or groups through a unified control interface, reducing the overall complexity of the control signal architecture
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
The method prolongs the functional life of the display by reducing heat-related aging and maintaining consistent luminance, avoiding local white point shifts that affect image quality.
Implementation Method 1
a light emitting diode which comprises a p-n junction and emits light when forward biased
Data Source
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AI summary
A method (100) for operating a device comprising a Light Emitting Diode (LED) display is disclosed. The method, performed in the device, comprises obtaining a representation of temperatures to which different areas of the display are subjected (110), generating a display heat map from the obtained representation (120), and managing the luminance of the different areas of the display on the basis of the display heat map (130). Also disclosed are a device (900, 1000) and a computer program configured to carry out a method for operating a device.