OLED Pixel Circuit Driving Method for High Aperture Ratio
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Solution Overview
Problem
Conventional organic light emitting diode (OLED) displays face challenges in achieving a high aperture ratio due to the complexity and density of scan and data lines required for driving pixels, which limits the arrangement of elements and reduces the emitting pixel area.
Innovation Solution
The solution involves a display panel configuration with a reduced number of scan and data lines by using a driver to operate multiple organic light emitting elements, where at least four light emitting elements are arranged in a way that two are parallel to scan lines and two are vertical, allowing for time-divided data signals and sequential selection signals to simplify the arrangement and operation of pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional scan and data lines are used to drive each pixel individually, then pixel driving control is achieved, but the number of lines increases and aperture ratio decreases
Solution Approach 1:
The patent merges the driving control of multiple pixels into a single pixel circuit by sharing common scan and data lines. Specifically, one pixel circuit drives multiple pixels (e.g., four pixels) by time-division multiplexing, reducing the total number of lines required across the display panel while maintaining individual pixel controllability through sequential activation.
Solution Approach 2:
The pixel circuit is designed with multi-functional capability to drive multiple pixels through a single circuit unit. The same transistor and capacitor components are reused across different pixels, allowing one circuit to perform the driving function for multiple pixels at different time intervals, thereby reducing the overall line count and improving aperture ratio.
2Ease of operation
If multiple scan and data lines are arranged to drive pixels, then pixel driving is enabled, but the arrangement becomes difficult in limited display area
Solution Approach 1:
The patent combines multiple pixel driving functions into fewer shared lines, making the arrangement easier in limited display areas. By having one scan line and one data line serve multiple pixels through time-division, the physical layout requires fewer lines crossing the display area, simplifying the manufacturing process and improving ease of manufacture.
3Ease of operation
If conventional pixel configuration with separate driving circuits is used, then each pixel can be driven independently, but the aperture ratio is reduced due to more lines and circuits
Solution Approach 1:
The patent merges multiple independent pixel driving circuits into a single shared circuit that operates sequentially. By time-division multiplexing, the same transistor and capacitor are reused across different pixels, reducing the total circuit area occupied and thereby increasing the aperture ratio (emitting pixel area) while maintaining independent pixel control capability.
Solution Approach 2:
The pixel circuit is designed as a universal multi-functional unit that can drive multiple pixels. This universality reduces the total number of circuits required across the display, minimizing the area occupied by driving circuits and maximizing the aperture ratio available for light emission.
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 increases the aperture ratio, simplifies the arrangement of lines and elements, and reduces the number of data and scan lines, thereby enhancing the display's efficiency and reducing dead space, while allowing for the operation of multiple colors using common driving and switching transistors.
Implementation Method 1
organic light emitting diode display that emits light by electrically exciting an organic compound
Data Source
AI summary
An organic light emitting diode display, and a display panel and driving method thereof are provided. The organic light emitting diode display includes a plurality of data lines for transmitting data signals, a plurality of scan lines for transmitting selection signals, and a plurality of pixel circuits coupled to the data lines and the scan lines. The pixel circuits include at least four emitting elements for emitting light corresponding to amount of an applied current, a light emitting element driver for outputting a data current corresponding to at least one of the data signals, and a switching unit for respectively transmitting the data current to the four emitting elements. In the display, at least two emitting elements of the four light emitting elements are formed in different places.