Green LED Pixel Circuit Current Management
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Solution Overview
Problem
Light-emitting diode (LED) panels face challenges in achieving optimal light-emitting efficiency, particularly for green LEDs, as different colors require different materials and efficiency curves, necessitating adjustments in pixel circuits to enhance overall light-emitting efficiency.
Innovation Solution
A pixel array design that includes multiple red, green, and blue pixels, where green pixels are arranged in lines and equipped with specific transistor configurations to reduce current passing through green light-emitting diodes by connecting transistors in parallel, optimizing the light-emitting efficiency of green LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the green light-emitting diode operates at high current to increase brightness, then the brightness output is improved, but the light-emitting efficiency decreases due to deviation from optimal efficiency curve
Solution Approach 1:
The pixel circuit is segmented into multiple transistor components (first transistor, second transistor, third transistor, fourth transistor) that work together to precisely control current distribution. This segmentation allows independent optimization of current control for green LEDs, enabling operation at optimal efficiency points while maintaining required brightness through coordinated transistor action.
Solution Approach 2:
The invention changes the electrical parameters (current magnitude and distribution) by utilizing the specific characteristics of multiple transistors in the circuit. By adjusting the control signals to the fourth transistor and modifying the current division ratio through the transistor network, the green LED operating point is shifted to match its optimal efficiency curve, thereby improving light-emitting efficiency while maintaining brightness.
2Device complexity
If a simple pixel circuit is used to reduce device complexity, then the manufacturing and operation become easier, but the ability to optimize light-emitting efficiency for different LED colors is reduced
Solution Approach 1:
The pixel circuit design incorporates multiple transistors that serve multiple functions: the first transistor controls data signal input, the second transistor regulates current to the green LED, the third transistor provides additional current control, and the fourth transistor optimizes the current division. This multi-functional transistor network enables the same circuit structure to optimize performance for green LEDs while maintaining compatibility with red and blue LED requirements, achieving color-specific efficiency optimization without requiring separate circuits for each color.
Data Source
AI summary
A pixel array is provided. The pixel array includes a plurality of red pixels, a plurality of green pixels, and a plurality of blue pixels. Each green pixel includes a light emitting diode (LED), a first transistor, a second transistor, a third transistor, and a fourth transistor. The LED receives a system low voltage. The first transistor receives a first data signal and a first scan signal. The second transistor is coupled to a second end of the first transistor and the anode of the light emitting diode. The third transistor receives a system high voltage and a first control signal, and is coupled to a first end of the second transistor. The fourth transistor is coupled to the anode of the light-emitting diode of an adjacent green pixel, a control terminal of the third transistor, and the anode of the light-emitting diode.