Pixel Circuit with Segmented Power Lines for LED Emission
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Solution Overview
Problem
The emission efficiency of light emitting diodes (LEDs) in display devices is hindered by parasitic capacitance and uneven voltage distribution, leading to reduced light emission in some LEDs when both electrodes are biased with the same voltage.
Innovation Solution
A pixel design incorporating multiple transistors and power supply lines with distinct voltage levels, where transistors control the flow of driving current to LEDs, and power voltages are applied selectively to ensure all LEDs emit light by initializing parasitic capacitance and optimizing voltage distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If both electrodes are biased with the same voltage, then the manufacturing and control are simplified, but the emission efficiency of LEDs deteriorates due to no current flowing to some LEDs
Solution Approach 1:
The patent divides the power supply system into multiple independent power supply lines (first power supply line, second power supply line, third power supply line) with different voltage levels. This segmentation allows selective voltage application to different LED groups, ensuring current flows to all LEDs regardless of their orientation, thereby resolving the emission efficiency problem while maintaining manageable system complexity through modular power distribution.
Solution Approach 2:
The patent applies different voltage levels (first voltage level, second voltage level, third voltage level) to different power supply lines based on local requirements. By initializing parasitic capacitance with specific voltage levels and applying appropriate voltages to individual LED groups, the system optimizes emission efficiency locally for each LED while maintaining overall system functionality.
2Device complexity
If parasitic capacitance is not initialized, then the circuit design is simpler, but uneven voltage distribution occurs leading to reduced light emission in some LEDs
Solution Approach 1:
The patent implements preliminary initialization of parasitic capacitance by applying specific voltage levels (first voltage level, second voltage level, or third voltage level) to power supply lines before LED operation. This preliminary action ensures uniform voltage distribution across all LEDs, preventing reduced light emission in any LED group and ensuring consistent illumination intensity throughout the display.
3Loss of energy
If multiple power supply lines with different voltage levels are used, then LED emission efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent designs the power supply system with multi-functionality, where the same power supply architecture serves multiple purposes: initializing parasitic capacitance, providing operating voltages to LEDs, and enabling selective voltage application to different LED groups. This universal approach reduces energy wastage while managing device complexity through a consolidated power management system that performs multiple functions simultaneously.
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 solution enhances the emission efficiency of LEDs by ensuring all LEDs emit light uniformly, improving display quality and reducing energy wastage due to parasitic capacitance.
Implementation Method 1
a light emitting diode (LED) emits light corresponding to electrical signals applied to respective electrodes
Implementation Method 2
configured to emit light by the driving current
Data Source
AI summary
A pixel includes: a first transistor configured to generate a driving current corresponding to a data signal transmitted from a corresponding data line; a first light emitting diode (LED) including a cathode connected to a first power supply line and an anode connected to a second power supply line, and configured to emit light by the driving current; a second light emitting diode (LED) including a cathode connected to the second power supply line and an anode connected to the first power supply line, and configured to emit light by the driving current; a second transistor connected to the anode of the first light emitting diode (LED), and configured to transmit the driving current to the first light emitting diode (LED); and a third transistor connected to the anode of the second light emitting diode (LED), and configured to transmit the driving current to the second light emitting diode (LED.