Micro-LED Display Light Conversion for Uniform Low-Power Pixels
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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 passive-matrix drive types and high current driving, which affect brightness uniformity and lifespan.
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, employing a phosphor layer and color filter to achieve efficient light emission without a separate LCD, and an anisotropic conductive film for electrical connection, allowing for low power consumption and improved manufacturing efficiency.
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 and brightness uniformity deteriorates
Solution Approach 1:
The patent divides the display into multiple independent micro-LEDs, each corresponding to one or more pixels. This segmentation allows each micro-LED to be independently controlled, enabling precise power management where only necessary pixels are illuminated, thus reducing overall power consumption while maintaining simple device structure.
Solution Approach 2:
Each micro-LED is designed with specific color characteristics (red, green, blue, or white) to match the requirements of local pixels. This local quality approach ensures optimal light emission efficiency for each region, reducing the need for color conversion and improving overall power efficiency.
2Device complexity
If OLEDs are used for display, then device complexity is reduced compared to TFT-LCD, but power consumption increases and efficiency decreases
Solution Approach 1:
The patent employs inorganic micro-LEDs which have significantly longer lifespan and higher efficiency compared to organic OLEDs. By replacing organic materials with inorganic semiconductor LEDs, the system achieves superior energy efficiency and durability while maintaining the simplicity of direct light emission without complex backlight or color conversion layers.
3Device complexity
If passive-matrix drive type is used for OLED, then device complexity is reduced, but response speed deteriorates due to large capacitance
Solution Approach 1:
By dividing the display into small micro-LED units, the capacitance of each individual LED is significantly reduced compared to large OLED pixels. This segmentation enables faster charging and discharge cycles, dramatically improving response speed while allowing for simpler drive circuits.
4Device complexity
If pulse width modulation is used for low duty ratio driving, then device complexity is reduced, but lifespan deteriorates due to high current
Solution Approach 1:
The patent utilizes the inherent characteristics of inorganic micro-LEDs which can operate efficiently at various current levels without significant degradation. By optimizing the operating current and duty cycle parameters, the system achieves long lifespan even with PWM control, unlike OLEDs which suffer from accelerated degradation under similar conditions.
5Speed
If AM driving type is used for OLED, then response speed is improved, but manufacturing cost increases and brightness uniformity deteriorates due to TFT connections
Solution Approach 1:
The patent uses small micro-LEDs that can be directly connected to simple drive circuits without requiring complex TFT connections for each pixel. The segmented structure allows for simplified manufacturing processes while maintaining fast response speeds, reducing both manufacturing costs and brightness non-uniformity issues associated with TFT variations.
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 display apparatus achieves low power consumption, high efficiency, and uniform light intensity across pixels, suitable for applications like wearable devices and smartphones, while reducing manufacturing costs and improving brightness uniformity.
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.