Pixel Circuit Design for Reducing OLED Display Area
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Solution Overview
Problem
The challenge is to reduce the area occupied by pixels in organic light-emitting displays while maintaining functionality, as the demand for additional functions within the display area increases, requiring a method to minimize pixel size without compromising display quality or adding complexity.
Innovation Solution
The proposed solution involves a pixel circuit design that includes a first and second pixel circuit, each comprising specific thin-film transistors, storage capacitors, and light-emitting devices, where the second pixel circuit shares components with the first to reduce area usage, allowing for efficient light emission control through differential voltage management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional pixel circuit design is used, then the display quality is maintained, but the pixel area is large which limits additional functions
Solution Approach 1:
The patent combines two pixel circuits into a shared structure where the first and second pixel circuits share common components including the first driving TFT, first storage capacitor, and first scan TFT. This merging reduces the total pixel area while maintaining the functionality of both pixel circuits through shared resources and differential voltage management.
Solution Approach 2:
The shared components serve multiple functions: the first driving TFT controls current for both first and second light-emitting devices, the first storage capacitor stores voltage for both pixels, and the first scan TFT provides scanning signals to both pixel circuits. This multi-functionality enables reduced pixel area while supporting additional display functions.
2Area of stationary object
If the pixel area is reduced to accommodate additional functions, then the transmission area increases, but the display quality may be compromised
Solution Approach 1:
By merging two pixel circuits into a shared structure, the patent reduces pixel area while maintaining display quality through careful design of shared components. The first driving TFT, first storage capacitor, and first scan TFT are shared between both pixel circuits, ensuring reliable operation and consistent display performance.
Solution Approach 2:
The patent employs differential voltage management where the second pixel circuit operates based on the difference between the first gate voltage and second data voltage. This parameter change approach allows efficient control of both pixel circuits using shared components while maintaining display quality and enabling reduced pixel area.
3Adaptability or versatility
If additional functions are added to the display area, then the versatility increases, but the pixel circuit complexity increases
Solution Approach 1:
The patent merges two pixel circuits into a shared structure that supports additional functions while managing complexity. By sharing common components (first driving TFT, first storage capacitor, first scan TFT) between both pixel circuits, the design reduces overall complexity compared to having separate complete circuits for each pixel, enabling additional functions within the display area.
Data Source
AI summary
A pixel circuit includes a first scan thin-film transistor (TFT) receiving a first data voltage, a first storage capacitor maintaining a first gate voltage corresponding to the first data voltage, a first driving TFT having a gate connected to the first storage capacitor and controlling the amount of a first driving current based on the first gate voltage, a first light-emitting device emitting light according to the first driving current, a second scan TFT receiving a second data voltage in response to an emission control signal, a second driving TFT having a gate connected to the gate of the first driving TFT and a source receiving the second data voltage and controlling the amount of a second driving current based on a difference between the first gate voltage and the second data voltage, and a second light-emitting device emitting light according to the second driving current.