Scan Driver With Simultaneous Clock Output Blocks
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Solution Overview
Problem
Existing display devices face challenges in efficiently driving scan signals for both sequential and simultaneous operations, leading to complexities in scan driver design and increased size and cost.
Innovation Solution
A scan driver is designed with multiple scan driving blocks that can output scan signals sequentially or simultaneously, utilizing a combination of transistors and capacitors to synchronize clock signals and apply gate-on or gate-off voltages based on a simultaneous light emission control signal, allowing for efficient sequential and simultaneous driving methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a scan driver is designed to support both sequential and simultaneous driving operations, then the functionality and adaptability of the display device is improved, but the device complexity and size increase
Solution Approach 1:
The scan driver is designed with a universal structure that can perform both sequential driving and simultaneous driving operations. The scan driving blocks are configured to respond to different control signals (sequential light emission control signal vs. simultaneous light emission control signal) to achieve different driving modes, making the driver adaptable to multiple operating scenarios without requiring separate dedicated circuits for each mode.
Solution Approach 2:
The scan driver employs dynamic control mechanisms where the operation mode can be switched based on the state of control signals. The scan driving blocks dynamically adjust their behavior - sequentially outputting scan signals when receiving sequential control signals, and simultaneously outputting scan signals when receiving simultaneous control signals - allowing the system to adapt its complexity level based on operational requirements.
2Productivity
If multiple scan driving blocks are used to enable simultaneous output of clock signals, then the productivity and efficiency of the display device is improved, but the device complexity increases
Solution Approach 1:
The scan driver is divided into multiple independent scan driving blocks, where each block can independently output clock signals and scan signals. This segmentation allows simultaneous driving operations to be performed by different blocks in parallel, improving productivity. Each block processes clock signals and generates scan signals independently, enabling efficient simultaneous output without requiring a monolithic complex structure.
3Manufacturing precision
If clock signals are shifted by horizontal cycles to enable sequential output, then the precision of scan signal timing is improved, but the device complexity increases
Solution Approach 1:
The clock signals are designed with periodic shifting characteristics, where the second clock signal is shifted by a specific horizontal cycle relative to the first clock signal. This periodic shifting enables precise timing control for sequential scan signal output. The regular, predictable nature of the clock signal shifting simplifies the control mechanism compared to arbitrary timing adjustments, as the shifting follows a consistent periodic pattern that can be easily implemented and maintained.
Data Source
AI summary
A scan driver may include: a first scan driving block, outputting a second clock signal to a first output terminal according to an input signal, in synchronization with a first clock signal; and a second scan driving block, outputting the first clock signal according to the output signal of the first scan driving block to a second output terminal, in synchronization with the second clock signal, wherein the first scan driving block and the second scan driving block simultaneously output an entire clock signal, according to a level of a simultaneous light emission control signal.