OLED Pixel Layout for High Resolution AMOLED Driving
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Solution Overview
Problem
Current AMOLED driving circuit designs are limited by the layout area of thin film transistors (TFTs), making it impossible to achieve high resolution in small-sized OLED display panels for portable devices like cell phones and PDAs.
Innovation Solution
The OLED display panel is designed with a rectangular pixel layout, where each pixel is composed of multiple sub-pixels, and a driving method that treats each pair of sub-pixels as a unit, using a 3*3 pixel array analysis to determine the driving relationship between center and surrounding pixels for efficient color mixing and luminance similarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional AMOLED driving circuit designs using multiple TFTs and storage capacitors are used to drive a single OLED, then the driving circuit can operate reliably, but the pixel layout area becomes too large to achieve high resolution in small-sized display panels
Solution Approach 1:
The patent merges multiple sub-pixels (R, G, B sub-pixels) into a single pixel unit that shares common TFTs and storage capacitors. Specifically, the red sub-pixel and green sub-pixel share a first TFT and first storage capacitor, while the green sub-pixel and blue sub-pixel share a second TFT and second storage capacitor. This merging reduces the number of discrete components per pixel, thereby reducing the overall pixel layout area while maintaining reliable driving circuit operation through the shared component architecture.
2Area of stationary object
If the pixel layout area is reduced to fit more pixels in small-sized panels, then high resolution can be achieved, but the conventional driving circuit design with multiple TFTs per pixel cannot be implemented
Solution Approach 1:
The patent implements a merged pixel structure where adjacent sub-pixels share TFTs and storage capacitors. The first pixel includes red, green, and blue sub-pixels that share TFTs and capacitors with adjacent pixels, creating a compact layout. This merging approach reduces the pixel layout area to enable high resolution in small panels while managing device complexity through systematic sharing of driving components across pixel boundaries.
3Reliability
If more TFTs and storage capacitors are allocated to each pixel for reliable driving, then the driving performance is improved, but the minimum layout area of each pixel increases
Solution Approach 1:
The patent combines multiple sub-pixels into a single pixel unit with shared TFTs and storage capacitors. The red sub-pixel and green sub-pixel share a first TFT and first storage capacitor, while the green sub-pixel and blue sub-pixel share a second TFT and second storage capacitor. This sharing arrangement reduces the minimum layout area per pixel while maintaining driving performance through the distributed yet shared component architecture that serves multiple sub-pixels efficiently.
Data Source
AI summary
An OLED display and a method for driving a display panel thereof are provided. The layout area of each pixel of the OLED display panel is specially designed to be a rectangle in shape, and the pixels are driven in such a manner that each two sub-pixels are taken as a unit to be driven. As such, according to the interaction manner among sub-pixels of the pixels, two sub-pixels can be viewed as one pixel to achieve more pixels within 1 inch in comparison with the conventional panels, which enables the current AMOLED driving circuit designs to be used in specific high resolution applications.