Bi-directional Scan Driver for OLED Display Orientation
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Solution Overview
Problem
Existing scan drivers for OLED displays are limited by their unidirectional driving method, making it difficult to apply scan signals to pixels in portable devices with varying display orientations without sequence changes, which affects viewing angles and operational efficiency.
Innovation Solution
A bi-directional scan driver design that maintains a constant temporal sequence for scan signals across both forward and reverse directions, utilizing a configuration with two types of shift registers and clock signals with phase differences to ensure consistent signal transmission to pixels regardless of orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a unidirectional scan driver is used, then the circuit design is simple, but it cannot maintain constant temporal sequence for scan signals when the display orientation changes
Solution Approach 1:
The scan driver dynamically switches between forward and reverse driving directions based on display orientation requirements. The circuit includes switching elements that can change the signal transmission direction, allowing the same driver to adapt to different orientations (upright, upside-down, left, right) while maintaining proper scan signal temporal sequence
Solution Approach 2:
The scan driver is designed to perform multiple functions: it can drive pixels in both forward and reverse directions, accommodate different display orientations, and maintain constant temporal sequence for scan signals regardless of orientation. This multi-functionality is achieved through a unified circuit design that integrates direction control and signal transmission
2Adaptability or versatility
If the scan driver changes signal transmission direction to match display orientation, then viewing angle characteristic improves, but the temporal sequence of scan signals changes causing display errors
Solution Approach 1:
The circuit dynamically adjusts the signal transmission path while preserving the temporal sequence. When switching between forward and reverse directions, the circuit uses switching elements to reroute signals appropriately, ensuring that the scan signals maintain their correct temporal order regardless of the physical display orientation
Solution Approach 2:
The circuit design employs asymmetric switching configurations where the forward and reverse signal paths are intentionally designed differently to account for the directional nature of scan signals. This asymmetric design ensures that when reversing direction, the temporal sequence is preserved through carefully controlled signal routing rather than simple symmetric reversal
Data Source
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AI summary
A scan driver (20,20') and a display device (100) including the same are provided. The scan driver (20,20') according to an exemplary embodiment of the present invention generates and transmits at least two different types of scan signals to a display unit (10) including a plurality of pixels (200), and includes a plurality of sequence drivers each including a plurality of shift registers for generating the different scan signals. In one of the sequence drivers, the scan signal generated in one of the shift registers is transmitted as the input signal of a next one of the shift registers, and the scan signal is concurrently transmitted as an input signal to another one of the shift registers of another one of the sequence drivers of a previous stage or a next stage adjacent to the one of the sequence drivers including the one of the shift registers according to the driving direction of the scan driver (20,20').