Micro-LED Display With Wavelength Conversion for Low-Power Color Output
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Solution Overview
Problem
Conventional display technologies, such as TFT-LCD and OLED, face issues with high power consumption, inefficient response speed, and increased manufacturing costs due to the need for constant backlight power and complex pixel driving mechanisms.
Innovation Solution
A display apparatus utilizing micro-light emitting diodes with a light conversion part that converts blue or UV light into red, green, and white light, reducing power consumption and manufacturing costs by eliminating the need for a separate LCD and optimizing subpixel sizes for uniform light intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single LED is used to supply light to many pixels in a TFT-LCD panel, then device complexity is reduced, but power consumption increases because the backlight must remain constantly on
Solution Approach 1:
The display is divided into individual micro-LEDs for each pixel, allowing independent control of light emission at the pixel level rather than using a single backlight for the entire panel. This enables selective activation of only the pixels that need to display content, reducing overall power consumption while maintaining simple device architecture.
2Ease of manufacture
If OLEDs are used for display, then manufacturing process is simplified compared to TFT-LCD, but power consumption remains high due to organic material characteristics
Solution Approach 1:
The patent employs inorganic micro-LEDs with significantly longer operational lifetimes compared to organic OLED materials. The inorganic semiconductor LEDs maintain stable performance over extended periods without the degradation issues inherent in organic materials, reducing the need for frequent replacement and maintaining lower power consumption throughout the device lifecycle.
3Device complexity
If passive-matrix drive type is used for OLED, then device complexity is reduced, but response speed deteriorates due to large pixel capacitance
Solution Approach 1:
The display is segmented into individual micro-LEDs with significantly smaller capacitance compared to OLED pixels. This segmentation enables the use of simple passive-matrix driving while achieving fast response speeds, as the small capacitance of each micro-LED allows rapid charging and discharging without requiring complex active-matrix circuitry.
4Ease of operation
If pulse width modulation is used for low duty ratio driving, then brightness control is achieved, but lifespan deteriorates due to high current
Solution Approach 1:
The patent utilizes the inherent characteristics of inorganic micro-LEDs to operate efficiently at low duty ratios with reduced current requirements. By changing the operating parameters to match the low-capacitance micro-LED structure, the system achieves effective brightness control through pulse width modulation without subjecting the LEDs to high current stress that would degrade their lifespan.
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 solution achieves low power consumption and high efficiency, enabling the display apparatus to be applied to wearable devices and smartphones while reducing manufacturing costs and ensuring uniform light intensity across colors.
Implementation Method 1
the light conversion part emits red light through wavelength conversion of light emitted from the at least one first light emitting diode
Data Source
AI summary
A display apparatus device including a panel substrate including a circuit, and a light module including light sources each including a light emitter, a connection line, a light transmission layer on the light emitter, and a light block layer on the light transmission layer, in which the light sources includes first to fourth light sources, a transmission layer of the first light source includes a first converter, a transmission layer of the fourth light source includes a second converter, the first converter includes a wavelength converter to convert a first primary light of the first light source into a red color range, the second converter converts a fourth primary light of the fourth light source into a white light, and a peak wavelength of a second primary light of the second light source is different from that of a third primary light of the third light source.