Gate Driving Circuit with Discharge Circuits for Flicker Reduction
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Solution Overview
Problem
Large TFT-LCD devices are prone to image flicker due to the increasing size, which existing gate pulse driving methods fail to effectively address.
Innovation Solution
A gate driving circuit with a gate pulse modulation method that employs a cascaded structure of gate drivers, discharge circuits, and a gate pulse modulation circuit, utilizing a combination of discharge resistors and switch configurations to reduce the chamfered falling edge signal across multiple gate drivers, thereby minimizing flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the TFT-LCD device size is increased, then the display area is improved, but image flicker occurs
Solution Approach 1:
The gate driving circuit is divided into multiple gate drivers (first gate driver, second gate driver, etc.) that are cascaded together. Each gate driver handles a portion of the gate lines, allowing the large display to be segmented into manageable sections that can be driven independently with optimized pulse signals, thereby reducing flicker in the overall large display area.
Solution Approach 2:
The patent employs periodic gate pulse signals with specific timing characteristics to drive the display. By optimizing the period and duty cycle of these periodic pulses, and by alternating the driving patterns between different gate drivers in the cascade, the system maintains stable illumination across the large display area without causing flicker.
2Device complexity
If conventional gate pulse driving method is used, then the device structure is simple, but flicker cannot be effectively reduced
Solution Approach 1:
The gate driving function is segmented into multiple independent gate drivers connected in cascade. This segmentation allows each driver to be optimized for specific timing requirements, enabling effective flicker reduction through coordinated operation while maintaining a relatively simple overall structure that builds upon conventional designs.
Solution Approach 2:
The patent introduces dynamic control mechanisms where the timing and characteristics of gate pulses are adjusted based on the specific requirements of different display regions. The cascaded gate drivers can dynamically coordinate their output patterns to eliminate flicker conditions, adding functional complexity only where necessary to solve the flicker problem.
Data Source
AI summary
A gate driving and modulating circuit, for reduced flicker on a display, includes a first discharge circuit and a plurality of interconnected gate drivers. The plurality of gate drivers is electrically coupled to ground through the first discharge circuit. Each of the plurality of gate drivers includes a second discharge circuit. The gate driving circuit performs a chamfering of a gate signal by being simultaneously discharged through the first discharge circuit and the second discharge circuit.