Micro-LED Display With Reflective Electrodes
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Solution Overview
Problem
Current display technologies, such as TFT-LCD and OLED, face issues with high power consumption, inefficiency, and manufacturing costs, particularly due to constant backlight usage in TFT-LCD and deterioration in OLEDs under high current driving conditions.
Innovation Solution
A display apparatus utilizing micro-light emitting diodes (LEDs) formed from nitride semiconductors, arranged with transparent and reflective electrodes to reduce power consumption and thickness, and driven by a TFT panel for high resolution and efficiency, allowing light emission through side surfaces for improved luminous efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If TFT-LCD uses a backlight unit with light emitting diodes, then color realization is achieved, but power consumption increases due to constant backlight usage
Solution Approach 1:
The display is divided into independently controllable micro-LEDs, where each micro-LED can be turned on or off individually. This segmentation allows only the necessary pixels to consume power, eliminating the waste of constant backlight illumination in TFT-LCD while maintaining color realization capabilities
Solution Approach 2:
The patent transitions from organic light emitting diodes to inorganic semiconductor LEDs, changing the material parameter to achieve lower power consumption. Additionally, the display switches from constant backlight mode to selective pixel activation, fundamentally changing the illumination parameter to reduce overall power consumption
2Productivity
If OLED display uses high current driving through pulse width modulation, then low duty ratio is achieved, but lifespan deteriorates
Solution Approach 1:
The patent changes the driving material from organic diodes to inorganic semiconductor LEDs, which have superior current carrying capacity and stability. This parameter change allows the system to maintain high response speeds through PWM while significantly extending lifespan, as inorganic LEDs can withstand high current driving conditions without the degradation issues that plague OLEDs
3Manufacturing precision
If active matrix driving type OLED display connects TFTs for each pixel, then high resolution is achieved, but manufacturing costs increase and brightness non-uniformity occurs
Solution Approach 1:
The patent makes each micro-LED serve multiple functions: it acts as both the light source and the pixel element, eliminating the need for separate TFTs per pixel. This universal approach reduces device complexity and manufacturing costs while maintaining high resolution capability through precise micro-LED positioning and control
Solution Approach 2:
By changing from OLED material to inorganic LED material, the patent achieves more consistent electrical and optical characteristics across all pixels. This parameter change reduces brightness non-uniformity issues that arise from varying TFT characteristics, while the simplified structure lowers manufacturing complexity
4Use of energy by moving object
If light emitting diodes are arranged with transparent and reflective electrodes, then power consumption is reduced and thickness is decreased, but manufacturing complexity increases
Solution Approach 1:
The patent applies different electrode types (transparent vs. reflective) at different locations based on functional requirements. Transparent electrodes are used where light emission is needed, while reflective electrodes are used for light extraction enhancement. This localized differentiation achieves power reduction and thinning while managing manufacturing complexity through targeted rather than universal complexity
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 micro-LED display achieves low power consumption, high efficiency, and reduced thickness, making it suitable for various applications including wearable devices and TVs, while minimizing brightness non-uniformity and manufacturing costs.
Implementation Method 1
A light emitting diode generally refers to an inorganic semiconductor device that emits light through recombination of electrons and holes
Implementation Method 2
a light emitting diode is an inorganic semiconductor device that emits light through recombination of electrons and holes
Implementation Method 3
a plurality of second reflective electrodes electrically connected to the light emitting diodes, respectively, and reflecting light emitted from the light emitting diodes
Data Source
AI summary
A display apparatus including a light emitting diode part including a plurality of regularly arranged light emitting diodes, and a TFT panel part configured to drive the light emitting diode part. The light emitting diode part includes a transparent electrode, the light emitting diodes regularly disposed on a first surface of the transparent electrode and electrically connected to the transparent electrode, a plurality of first reflective electrodes disposed at sides of the light emitting diodes, surrounding the light emitting diodes, and electrically connected to the transparent electrode, and a plurality of second reflective electrodes electrically connected to the light emitting diodes, respectively, and reflecting light emitted from the light emitting diodes.