Gate Driver Segmentation for Flexible Display Frequency Control
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Solution Overview
Problem
Existing gate drivers for display devices are limited in their ability to drive different display areas at varying frequencies, particularly in increasing frequency directions, due to the blocking of gate signals which prevents subsequent signal transmission parts from outputting gate signals.
Innovation Solution
A gate driver is designed with multiple signal transmission parts connected in cascade via carry lines, where each signal transmission part includes two output circuits: one for outputting a carry signal and another for outputting a gate signal. This configuration allows the carry signal to be output regardless of the gate signal output, enabling flexible blocking of gate signals and independent frequency control for different display areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gate signals are blocked in a signal transmission part to skip a frame, then the gate signal output for that area is stopped, but subsequent signal transmission parts cannot output gate signals either
Solution Approach 1:
The gate driver is divided into multiple independent signal transmission parts (first, second, third, etc.), where each part can independently control gate signal output to different display areas. This segmentation allows one part to block gate signals for frame skipping while other parts continue normal operation, enabling different frequencies for different areas without mutual interference.
Solution Approach 2:
Each signal transmission part includes dynamic control circuits (first output circuit and second output circuit) that can adjust the output state of gate signals and carry signals based on control signals. This dynamic control enables flexible frequency adjustment and frame skipping by selectively blocking or transmitting signals in different parts, allowing the system to adapt to different driving requirements.
2Device complexity
If a single frame frequency is used for all pixels, then the gate driver operation is simple, but different display areas cannot be driven at different frequencies
Solution Approach 1:
The gate driver is segmented into multiple signal transmission parts, each capable of independent frequency control. This allows different display areas to be driven at different frequencies while maintaining relatively simple operation within each segment, as each part follows the same basic signal transmission logic independently.
Solution Approach 2:
Each signal transmission part is designed with universal functionality to handle both normal gate signal transmission and frame skipping operations. The first and second output circuits in each part can be selectively activated based on control signals, enabling the same structural unit to perform multiple functions (normal driving and frame skipping) without requiring completely different circuit designs.
3Loss of energy
If gate signals are blocked to reduce power consumption, then energy usage decreases, but the ability to output gate signals subsequently is lost
Solution Approach 1:
By segmenting the gate driver into multiple independent signal transmission parts, power consumption can be reduced by blocking signals in specific parts (e.g., during frame skipping) while maintaining signal transmission continuity in other parts. Each part operates independently, so blocking in one part does not affect the reliability of signal transmission in other parts.
Solution Approach 2:
The dynamic control circuits in each signal transmission part allow flexible adjustment of signal output based on power management requirements. When power reduction is needed, the control signals can selectively block gate signal output in specific parts while maintaining carry signal transmission, enabling energy savings without compromising overall system reliability.
Data Source
AI summary
A gate driver and a display device including the same are discussed. The gate driver can include a plurality of signal transmission parts that are connected in a cascade manner via carry lines through which carry signals are applied from preceding signal transmission parts and are configured to output gate signals according to a clock signal. An (n)th signal transmission part (n being a positive integer) can include a first output circuit configured to receive a start pulse or an (n-1)th carry signal from a preceding signal transmission part and the clock signal, and charge or discharge a first-first control node and a first-second control node to output an (n)th carry signal, and a second output circuit configured to receive the (n)th carry signal output from the first output circuit and the clock signal, and charge or discharge a second-first control node and a second-second control node to output an (n)th gate signal.