Pixel Driving Circuit for Electroluminescent Display Power Optimization
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Solution Overview
Problem
Conventional electroluminescent display technologies face high power consumption and increased manufacturing costs due to the need for complex power source configurations with both positive and negative voltage potentials, which also lead to inefficient energy conversion and image quality issues.
Innovation Solution
A pixel driving circuit is designed with a power source featuring a negative voltage terminal and a ground potential terminal, incorporating a current driving circuit, storage capacitor, and switch circuit to deliver electric current to the light-emitting device, reducing the need for dual DC/DC converters and simplifying the power source configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a power source with both positive and negative voltage potentials is used, then the operating gate voltage can be reduced to 3V-0.5V, but the device complexity and manufacturing cost increase due to requiring two DC/DC converters
Solution Approach 1:
The patent extracts and eliminates the unnecessary negative voltage terminal from the power source configuration. By using only a positive voltage terminal and ground potential, the design removes the complexity associated with generating and maintaining negative voltage potentials, while still achieving the desired low operating gate voltage range through optimized circuit design
Solution Approach 2:
The patent applies asymmetry by using an unbalanced power source configuration with only a positive voltage terminal and ground potential, rather than a symmetric dual-polarity power source. This asymmetric approach simplifies the power generation system while maintaining effective voltage control for the transistor gate
2Adaptability or versatility
If two DC/DC converters are implemented to generate positive and negative voltages, then the power source can provide both voltage potentials, but the energy dissipation increases due to conversion efficiency losses
Solution Approach 1:
The patent removes one of the two DC/DC converters from the system by eliminating the need for negative voltage generation. This extraction reduces the total energy dissipation associated with voltage conversion while maintaining the necessary voltage potentials through a simplified single-converter architecture
Solution Approach 2:
The patent converts the potential harm of energy loss in dual-converter systems into benefit by using a single converter that directly generates the required positive voltage. This approach transforms the complex dual-converter energy dissipation problem into a simpler single-converter efficient solution
3Adaptability or versatility
If dual DC/DC converters are used for power generation, then both positive and negative voltages can be supplied, but the manufacturing cost increases
Solution Approach 1:
The patent extracts and eliminates one DC/DC converter from the dual-converter configuration, directly reducing manufacturing costs associated with purchasing, installing, and maintaining two separate voltage generation devices while still providing adequate voltage supply capability through the remaining single converter
Solution Approach 2:
The patent merges the functions of two separate voltage generation systems into a single power source configuration. By combining the voltage supply capabilities into one converter working with ground potential, the design reduces manufacturing complexity and cost while maintaining the necessary electrical characteristics
4Power
If conventional power source configuration is used, then sufficient voltage can be provided, but the image quality deteriorates due to increased ripple factor
Solution Approach 1:
The patent removes the source of ripple interference by eliminating the negative voltage terminal and its associated DC/DC converter. This extraction reduces the ripple factor in the power supply, leading to improved image quality while maintaining sufficient voltage provision through the simplified positive-voltage-only configuration
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 reduces power consumption, manufacturing costs, and energy dissipation while improving image quality by operating within a lower voltage range and eliminating the need for expensive CMOS techniques.
Implementation Method 1
the storage capacitor 116 is coupled between the gate and the drain of the transistor 114
Implementation Method 2
When an adequate voltage is applied between the anode and the cathode, the injected positive and negative charges recombine in the emissive layer to produce light
Data Source
AI summary
In an electroluminescent display, a pixel driving circuit is coupled between a ground potential terminal and a power voltage terminal of a power source to drive the operation of a light-emitting device. Upon receiving addressing and image data signals from a scan line and a data line, the pixel driving circuit operates to deliver an electric current to the light-emitting device according to the image data signal.