Multi-LED Sub-Pixel Circuit Topology for Display Resolution
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Solution Overview
Problem
Large-format inorganic light-emitting diode (iLED) displays face limitations in achieving high resolution due to the need for multiple power supplies and connections for different color LEDs, leading to reduced space and increased costs, as well as inefficiencies in power distribution when using a single power supply.
Innovation Solution
The implementation of a multi-color LED display with pixels comprising sub-pixels connected in series and parallel configurations, allowing for efficient power distribution and reduced circuitry, where each sub-pixel emits a different color of light, with a common voltage and current supply optimizing the operation of LEDs with varying efficiencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If separate power supplies are provided for each color LED in multi-color pixels, then each LED can operate at optimal voltage and current for maximum efficiency, but the number of power supplies, lines, and connections increases threefold, reducing available space and increasing costs
Solution Approach 1:
The patent merges multiple power supply systems into a single common power supply that serves all color LEDs (red, green, blue) in each pixel. This consolidation reduces the number of power supplies, power lines, and connections from three separate systems to one unified system, thereby increasing available space and reducing manufacturing costs while maintaining efficient power delivery through optimized circuit design
2Device complexity
If a single power supply is used for all color LEDs, then the number of power supplies and connections is reduced, but excess voltage must be dropped across circuit components, increasing heat and reducing overall power efficiency
Solution Approach 1:
The patent applies local quality by providing different electrical connection configurations to different color LEDs within the same pixel. Specifically, red LEDs are connected in parallel to receive higher current, while green and blue LEDs are connected in series to receive appropriate voltage division. This localized differentiation ensures that each LED color receives optimal electrical conditions for maximum efficiency, preventing excessive voltage drops and heat generation while using a single common power supply
Solution Approach 2:
The patent changes electrical parameters (voltage and current distribution) for different LED colors by using different circuit configurations. Red LEDs operate at higher current with parallel connection, while green and blue LEDs operate at divided voltage with series connection. This parameter optimization allows the single power supply to deliver efficient power to all LED types without excessive voltage drop or heat generation
3Manufacturing precision
If smaller iLEDs are used to achieve higher resolution displays, then display resolution improves, but the need for multiple power supplies and connections for different color LEDs further reduces available space
Solution Approach 1:
The patent merges multiple power distribution systems into a single unified power supply system that serves all color LEDs in each pixel. This consolidation dramatically reduces the number of power lines and connections required, thereby increasing the available space within each pixel area. The freed space enables the use of smaller iLEDs for higher resolution displays without compromising power distribution capability
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 configuration enhances power efficiency, reduces the number of components and connections, and improves light-output efficiency by optimizing the operation of LEDs with different efficiencies, enabling higher resolution displays while minimizing space and cost.
Implementation Method 1
Inorganic light-emitting diodes are semiconductor light sources relying on p-n junctions to emit light when a suitable voltage is applied across the light-emitting diode
Implementation Method 2
The color of the light emitted from the iLED corresponds to the energy bandgap of the semiconductor used. Thus, different semiconductor materials can produce different colors of light when stimulated with suitable voltages
Data Source
AI summary
A multi-color LED display comprises pixels, each comprising a first sub-pixel, a second sub-pixel, and a third sub-pixel. The first sub-pixel comprises a first light-emitting diode (LED) that emits a first color of light, the second sub-pixel comprises second LEDs that emit a second color of light different from the first color of light, and the third sub-pixel comprises third LEDs that emit a third color of light different from the first color of light and different from the second color of light. The second LEDs are electrically connected in parallel and the third LEDs are electrically connected in series.