OLED Pixel Storage Capacitor and Control Transistor Demultiplexing
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Solution Overview
Problem
Existing organic light emitting display devices face challenges in reducing manufacturing costs while maintaining efficient signal transmission and pixel operation, particularly due to the need for a greater number of data lines compared to output lines, which complicates the design and increases complexity.
Innovation Solution
The proposed solution involves a pixel circuit with an organic light emitting diode (OLED) and a storage circuit that includes a storage capacitor and a control transistor to manage data signals, along with a demultiplexer that time-divisionally outputs data signals to data lines, allowing for efficient signal storage and transmission, thereby reducing the number of required data lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If demultiplexers are used to time-divisionally output data signals, then the number of data lines can be reduced, but the device complexity increases due to additional control circuits
Solution Approach 1:
The patent combines the demultiplexer function with the pixel circuit by integrating the control transistor directly into the pixel structure. The control transistor's gate is connected to receive demultiplexer output signals, merging the data line reduction function with the pixel's existing control architecture, thereby reducing data line count without adding separate control circuits
Solution Approach 2:
The pixel circuit itself performs the demultiplexing function through its control transistor that responds to demultiplexer signals. The pixel's internal transistor structure serves dual purposes: controlling the OLED and simultaneously acting as a demultiplexer output stage, eliminating the need for external demultiplexer circuits
2Productivity
If the number of data lines is increased, then more pixels can be driven, but the manufacturing cost increases
Solution Approach 1:
The patent segments the data signal transmission by using time-division multiplexing through the demultiplexer. Instead of providing dedicated data lines to each pixel, the system divides the data signal transmission into time slots, allowing fewer physical data lines to serve more pixels by sequentially driving them in different time periods
Solution Approach 2:
The demultiplexer operates periodically to time-divisionally output data signals to different pixel groups. By cycling through different output lines in periodic time slots, the system can drive a larger number of pixels using a reduced set of data lines, thereby lowering manufacturing costs while maintaining high pixel density
3Productivity
If storage capacitor is added to store data signal, then signal transmission efficiency is improved, but the device complexity increases
Solution Approach 1:
The storage capacitor in the patent serves multiple functions: it stores the data signal voltage, maintains the drive voltage for the OLED during non-emission periods, and works in conjunction with the control transistor to enable time-divisional signal reception. By integrating this multi-functional capacitor into the existing pixel circuit, the design improves signal transmission efficiency without proportionally increasing complexity
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 the efficiency of signal transmission and reduces manufacturing costs by allowing for a greater number of data lines while maintaining effective pixel operation, improving the overall performance and cost-effectiveness of organic light emitting display devices.
Implementation Method 1
a light emitting layer between the anode electrode and the cathode electrode
Implementation Method 2
a storage capacitor to store the data signal
Data Source
AI summary
A pixel includes a pixel circuit and a storage circuit. The pixel circuit provides a driving current corresponding to a data signal to an organic light emitting diode. The storage circuit provides the data signal to the pixel circuit. The storage circuit includes a storage capacitor to store the data signal and a control transistor to transmit a data signal supplied from a data output line to the storage capacitor when the control transistor is turned on.