Micro LED Display Panel Wavelength Consistency Control
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Solution Overview
Problem
High driving current density in micro light emitting diode display panels leads to heat damage and color shift issues due to changes in current density, affecting the consistency of light wavelength and image quality.
Innovation Solution
Incorporating two micro light emitting diodes with different wavelengths in each sub-pixel, where the ratio of driving currents adjusts based on the gray level to maintain consistent dominant wavelength and light intensity, with current densities kept below 3 A/cm2 to minimize wavelength shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high driving current density is used to drive the micro light emitting diode, then the light intensity increases, but the light wavelength shifts to shorter wavelengths causing color shift and image quality degradation
Solution Approach 1:
The green sub-pixel is segmented into two independent micro light emitting diodes with different light wavelengths (first green micro LED with longer wavelength, second green micro LED with shorter wavelength). By independently controlling the driving currents to each diode, the patent achieves both high light intensity and consistent dominant wavelength across different gray levels, resolving the color shift problem caused by high current density.
2Illumination intensity
If high driving current density is used to drive the micro light emitting diode, then the brightness increases, but heat is generated causing circuit damage
Solution Approach 1:
The total driving current is segmented and distributed to two micro light emitting diodes instead of concentrating it in one diode. This distribution reduces the current density and heat generation in each individual diode while maintaining the required brightness through combined light output, thereby preventing heat-related circuit damage.
3Reliability
If small current is used to drive the micro light emitting diode, then heat damage is avoided, but the light wavelength becomes inconsistent across different gray levels
Solution Approach 1:
By segmenting the green sub-pixel into two micro LEDs with different wavelengths, the system can maintain low current density (avoiding heat damage) while achieving consistent dominant wavelength across gray levels through intelligent current allocation to the appropriate diode based on the required gray level.
Solution Approach 2:
The patent changes the operating parameters by using two diodes with different light wavelengths instead of a single diode. This allows the system to select or combine diodes based on the required gray level, maintaining wavelength consistency while operating at safe current densities.
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 effectively reduces color shift and maintains light wavelength consistency across different gray levels, improving the display quality of micro light emitting diode panels by controlling the driving currents of diodes with varying wavelengths.
Implementation Method 1
a first sub-pixel includes two micro light emitting diodes having different light wavelengths and controlled independently
Implementation Method 2
micro light emitting diodes with different colors as sub-pixels in the display panel
Data Source
AI summary
A micro light emitting diode display panel including a plurality of pixels and a control element is provided. One of the pixels include a first sub-pixel. The first sub-pixel includes two micro light emitting diodes having different light wavelengths and controlled independently. The control element controls driving currents to the two micro light emitting diodes according to a gray level of the first sub-pixel, wherein a ratio of the driving current of the micro light emitting diode with larger light wavelength to the driving current of the micro light emitting diode with smaller light wavelength increases as the gray level of the first sub-pixel increases. A driving method of the micro light emitting diode display panel is also provided.