Micro LED Sub-Pixel Current Balancing for Temperature Compensation
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Solution Overview
Problem
High-temperature operation leads to brightness reduction and color shift in micro LED display panels due to increased current density and reduced light-emitting efficiency of micro LEDs, causing inconsistent brightness and color performance.
Innovation Solution
The micro LED display panel employs two micro LEDs per sub-pixel with different impedances, where the operating current of one micro LED increases and the other decreases with temperature, controlled by a control element to maintain consistent brightness and color performance. The micro LEDs differ in current diffusion layer area, thickness, junction area, or material, and are connected in series or parallel with an impedance variable element to adjust current based on temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current density transmitted by data line is increased to achieve high-resolution display, then display resolution is improved, but data line is easily damaged by heat
Solution Approach 1:
The patent divides each sub-pixel into multiple micro LEDs (e.g., four micro LEDs per sub-pixel). This segmentation allows the current to be distributed across multiple devices rather than concentrating high current density through a single micro LED or data line connection, thereby reducing heat generation and damage risk while maintaining high display resolution through independent control of each micro LED.
2Use of energy by moving object
If operating temperature of micro LED increases, then light-emitting efficiency is reduced, but brightness performance becomes inconsistent
Solution Approach 1:
The patent incorporates temperature sensing functionality and uses the detected temperature information to adjust driving parameters of the micro LEDs. By monitoring the operating temperature and providing feedback control, the system can compensate for temperature-induced efficiency variations, ensuring consistent brightness performance across different operating conditions.
Solution Approach 2:
The patent adjusts driving parameters (such as current magnitude or pulse width) based on detected temperature conditions. When temperature increases causing efficiency reduction, the system modifies operating parameters to compensate, thereby maintaining consistent brightness output despite temperature variations and efficiency changes.
3Temperature
If operating temperature of micro LED increases, then wavelength shifts occur, but color performance becomes inconsistent
Solution Approach 1:
The patent uses temperature detection feedback to monitor operating temperature changes that cause wavelength shifts. Based on the detected temperature, the system adjusts driving parameters to compensate for color drift, ensuring consistent color performance across varying temperature 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 solution enhances the consistency of brightness and color performance by compensating for high-temperature-induced brightness reduction and color shift, ensuring stable display quality across varying temperatures.
Implementation Method 1
each of the plurality of display units includes a first sub-pixel. The first sub-pixel includes a first micro light-emitting diode and a second micro light-emitting diode
Data Source
AI summary
A micro light emitting diode display panel including a plurality of display units and a control element is provided. The plurality of display units are arranged in an array and each of the plurality of display units includes a first sub-pixel. The first sub-pixel includes a first micro light-emitting diode and a second micro light-emitting diode. The control element is configured to control light emission of the first micro light-emitting diode and the second micro light-emitting diode and determines operating currents of the first micro light-emitting diode and the second micro light-emitting diode. In a same display image, the operating current of the first micro light-emitting diode increases as an operating temperature of the first sub-pixel increases.