5T-1C Pixel Circuit for AMOLED Power Reduction
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Solution Overview
Problem
Active matrix organic light emitting display (AMOLED) devices operating on a digital driving scheme face increased power consumption due to rapid data writing on data lines as resolution increases, leading to higher power usage for charging and discharging.
Innovation Solution
A pixel circuit with a 5T-1C structure, comprising PMOS and NMOS transistors, a storage capacitor, and an organic light emitting diode, which compares current data with previous data stored in the capacitor, maintaining or updating the data based on similarity, thereby reducing power consumption by controlling the application of voltages and data signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If data writing speed is increased to support higher resolution, then image quality is improved, but power consumption for charging and discharging data lines increases
Solution Approach 1:
The pixel circuit stores data in advance during a data storage period before the light emitting period. By preparing data beforehand and storing it in the pixel circuit, the need for rapid continuous data writing during the light emitting period is reduced, thereby lowering power consumption while maintaining high resolution image quality
Solution Approach 2:
The display operation is divided into distinct periods: a data storage period for writing data and a light emitting period for displaying images. This periodic separation allows data to be written at lower speeds during the storage period, reducing power consumption, while still achieving high-resolution display during the light emitting period
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
The solution effectively reduces power consumption for charging and discharging data lines by selectively maintaining or updating data in the storage capacitor, optimizing power usage in AMOLED devices.
Implementation Method 1
the OLED device among the flat panel display devices displays an image using an organic light emitting diode that emits light based on recombination of electrons and holes
Implementation Method 2
a storage capacitor and an organic light emitting diode
Data Source
AI summary
A pixel circuit including a first through fifth PMOS transistors, a storage capacitor and an organic light emitting diode is disclosed. The first and second PMOS transistors are connected in serial between a first voltage and a first node. The third and fourth PMOS transistors are connected in serial between a second voltage and the first node. Gate electrodes of the first and third PMOS transistors are connected to a scan line. A gate electrode of the second PMOS transistor is connected to a first data line. A gate electrode of the fourth PMOS transistor is connected to a second data line. The fifth PMOS transistor is connected between a first power supply voltage and the organic light emitting diode and has a gate electrode connected to the first node. The storage capacitor is connected between the first node and a first electrode of the fifth PMOS transistor.