OLED Display Driving Circuit Merging Signals for Narrow Borders
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Solution Overview
Problem
High PPI pixel circuits in OLED display panels become increasingly complex, leading to design difficulties and non-uniform displays due to fixed scanning times for each stage, making it hard to drive rows of pixel circuits effectively, especially with narrow borders and higher display resolutions.
Innovation Solution
The OLED display panel design includes a non-display area with driving circuit units electrically connected to multiple rows of pixel units, allowing simultaneous initialization and threshold compensation of two or more rows, followed by successive data writing, which reduces the number of driving circuits and enhances scanning time efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each pixel driving circuit requires at least three transmission lines for transmitting three kinds of signals with different waveforms, then the driving circuit can provide complete signals for pixel circuit operation, but the peripheral driving circuit becomes more complicated and increases design difficulty
Solution Approach 1:
The patent merges multiple transmission lines into a single transmission line that can carry different types of signals (first scanning signal, second scanning signal, and light emitting signal) through time-division multiplexing. The driving circuit unit integrates multiple signal output functions into one circuit unit that sequentially outputs different signals to the same transmission line, thereby reducing the number of transmission lines from three to one while maintaining complete signal transmission capability.
Solution Approach 2:
The driving circuit unit is designed with multi-functionality, serving as both a first scanning signal output circuit, a second scanning signal output circuit, and a light emitting signal output circuit. This universal circuit unit can output different types of signals at different time periods through the same transmission line, eliminating the need for separate dedicated transmission lines for each signal type and reducing overall circuit complexity.
2Manufacturing precision
If scanning time for each stage is fixed to drive high PPI pixel circuits, then display resolution can be improved, but the driving circuit becomes more complicated and design difficulty increases
Solution Approach 1:
The patent introduces dynamic scanning time adjustment where the control unit can flexibly control the time periods for different signal outputs. The first scanning signal, second scanning signal, and light emitting signal are output at different time periods that can be dynamically adjusted based on display requirements. This dynamic timing control allows the system to maintain high display resolution while adapting the scanning process to reduce circuit complexity.
3Ease of operation
If fixed scanning time is used for initialization, threshold compensation, data writing, and light emitting stages, then timing is simplified, but display uniformity deteriorates and screen splitting occurs
Solution Approach 1:
The patent implements periodic action through time-division multiplexing, where different signal types are output in sequential time periods. The control unit manages the timing of first scanning signals, second scanning signals, and light emitting signals in a periodic manner, with each signal type occupying a specific time window. This periodic structure maintains timing simplicity while enabling precise control over signal transmission timing to ensure display uniformity and prevent screen splitting.
Data Source
AI summary
The description provides an organic light emitting display panel and a driving method thereof, characterized in that the organic light emitting display panel is divided into a display area and a non-display area, and the non-display area surrounds the display area; the display area includes a plurality of rows of pixel units, and each row of pixel units include a plurality of pixel circuits; a plurality of driving circuit units located in the non-display area; and any one of the driving circuit units is electrically connected to more than two rows of the pixel units simultaneously. Using the organic light emitting display panel and the driving method thereof provided by at least one embodiment of the invention can be more advantageous to narrow borders on the basis of ensuring resolution and avoiding abnormal display of images.