Bidirectional Scan Driving Apparatus for OLED Displays
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Solution Overview
Problem
The complexity and large mounting area requirements of bidirectional scan driving apparatuses for active matrix organic light emitting diode displays complicate operation and increase space usage.
Innovation Solution
A simplified scan driving apparatus with a circuit design that includes multiple scan driving blocks, where each block receives and transmits scan signals in both forward and backward directions using distinct clock signals and scan direction signals, reducing the number of wires and circuit complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a bidirectional scan driving apparatus is used to transmit scan signals in both forward and backward directions, then the display can show images in different directions (top-down or bottom-up), but the circuit becomes complicated and requires a large mounting area
Solution Approach 1:
The scan driving apparatus is divided into multiple scan driving blocks (first scan driving blocks and second scan driving blocks) that are alternately arranged. Each block is responsible for driving scan lines in a specific direction, with odd-numbered blocks driving in one direction and even-numbered blocks in the opposite direction. This segmentation eliminates the need for complex bidirectional control circuits while maintaining bidirectional scan capability across the entire display panel.
Solution Approach 2:
Instead of using a single scan driving apparatus that switches between forward and backward directions, the invention inverts the approach by having adjacent scan driving blocks operate in opposite directions simultaneously. This inversion of the conventional bidirectional approach simplifies the overall circuit design while achieving the same functional result of displaying images in different directions.
2Adaptability or versatility
If a bidirectional scan driving apparatus with multiple wires for transmitting signals is employed, then scan signals can be transmitted in both directions, but the mounting area increases
Solution Approach 1:
By segmenting the scan driving function into multiple specialized blocks, each block only needs to handle unidirectional scan signal transmission. This reduces the number of wires required at each block compared to a centralized bidirectional driver, and the alternating pattern allows efficient use of the display area without requiring additional mounting space for complex wiring.
Solution Approach 2:
The invention merges the functionality of multiple unidirectional scan drivers into a coordinated system where adjacent blocks work together to achieve bidirectional scanning. This combination approach eliminates the need for separate bidirectional control circuits and reduces the overall mounting area compared to traditional bidirectional scan driving apparatuses.
3Adaptability or versatility
If multiple wires are used to connect to the scan driving apparatus for bidirectional operation, then various signals can be transmitted, but the operation becomes complicated
Solution Approach 1:
The segmentation into alternating scan driving blocks with dedicated input terminals simplifies operation because each block has a fixed, simple connection pattern. First scan driving blocks receive signals at their first input terminals, while second scan driving blocks receive signals at their second input terminals. This regular pattern makes the system easier to operate and control compared to a complex bidirectional driver requiring multiple signal routing configurations.
Data Source
AI summary
A scan driving apparatus, includes scan driving blocks, each including a first and a second input terminal where a frame start or a scan signal of an adjacent scan driving block is input during forward and backward direction driving, respectively, wherein each of the scan driving blocks transmits a first scan direction signal instructing forward scan driving to a first transistor adjusting a clock signal in accordance with a signal input to the first input terminal, transmits a second scan direction signal instructing backward scan driving to the first transistor in accordance with a signal input to the second input terminal, and outputs the clock signal as a corresponding scan signal, the even numbered ones of the scan driving blocks receive a first clock signal as the clock signal, the odd numbered ones of the scan driving blocks receive a second clock signal as the clock signal.