Micro-LED TFT Display Modules for Lower-Power Pixel Driving
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Solution Overview
Problem
Existing display technologies, such as TFT-LCD and OLED, face challenges with high power consumption, inefficient power usage, and manufacturing costs, particularly due to the need for constant backlighting in TFT-LCDs and the limitations of OLEDs in power efficiency and lifespan.
Innovation Solution
A display apparatus utilizing micro-light emitting diodes (LEDs) with low power consumption, where the LEDs are arranged in modules and driven by a substrate with a drive unit, including TFTs, to achieve efficient power management and manufacturing flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If TFT-LCD uses one LED as light source for many pixels, then device complexity is reduced, but power consumption increases due to constant backlighting
Solution Approach 1:
The invention divides the display into independently controllable pixel units, where each pixel has its own driving circuit and can be controlled individually. This segmentation allows only the necessary pixels to be illuminated, eliminating the need for constant backlighting across the entire display, thus reducing power consumption while maintaining manageable complexity through modular architecture
Solution Approach 2:
The invention implements dynamic control of each pixel's light emission through active matrix driving circuits that can independently switch pixels on and off. This dynamic control enables precise power management where power is consumed only when and where needed, rather than maintaining constant illumination across the entire display
2Illumination intensity
If OLED is used for color display, then display quality is improved, but power efficiency deteriorates compared to inorganic LEDs
Solution Approach 1:
The invention transitions from organic light emitting materials to inorganic semiconductor materials, fundamentally changing the physical and chemical parameters of the light emitting diode. This material parameter change enables LEDs to achieve both high display quality with accurate color reproduction and superior power efficiency, as inorganic semiconductors convert electrical energy to light more efficiently than organic materials
3Illumination intensity
If passive matrix OLED uses pulse amplitude modulation, then brightness control is achieved, but response speed deteriorates due to large capacitance
Solution Approach 1:
The invention segments the display into small pixel units with individual driving circuits, reducing the total capacitance that needs to be charged and discharged for each pixel. This segmentation enables faster response speeds while maintaining precise brightness control through active matrix driving, eliminating the response speed limitations of passive matrix designs
Solution Approach 2:
The invention implements dynamic control through active matrix driving circuits that can rapidly switch each pixel on and off with precise timing. This dynamic control mechanism achieves fast response speeds by using short pulse widths and high-frequency switching, overcoming the sluggish response characteristic of passive matrix OLEDs with large capacitance
4Illumination intensity
If passive matrix OLED uses pulse width modulation for low duty ratio, then brightness control is improved, but lifespan deteriorates due to high current driving
Solution Approach 1:
The invention changes the material parameters from organic to inorganic semiconductors, which have superior current handling capabilities and operational stability. This parameter change allows the LED to maintain long lifespan even under high current driving conditions required for pulse width modulation, as inorganic semiconductors are more resilient to electrical stress and degradation than organic materials
5Illumination intensity
If active matrix OLED connects TFTs for each pixel, then brightness control is improved, but manufacturing cost increases
Solution Approach 1:
The invention employs universal inorganic semiconductor processes that are already established in the industrial manufacturing of electronic devices. The same fabrication techniques used for conventional electronics can be applied to manufacture the LED display, enabling multi-functionality in terms of both display performance and manufacturing efficiency, thereby reducing costs through process standardization and economies of scale
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, improved manufacturing efficiency, and reduced costs by using micro-LEDs and a modular design that allows for easier replacement and inspection of defective LEDs, resulting in enhanced display quality and reduced defect rates.
Implementation Method 1
A light emitting diode refers to an inorganic semiconductor device that emits light through recombination of electrons and holes
Data Source
AI summary
A display apparatus including a panel substrate, a TFT panel part including a plurality of connection electrodes disposed on an upper surface of the panel substrate, and a light emitting diode part disposed on the TFT panel part and including a plurality of light emitting modules adjacent to each other, in which each of the light emitting modules includes a plurality of pixels, each of the pixels includes three sub-pixels, and the three sub-pixels include blue light emitting diodes, green light emitting diodes, and red light emitting diodes.