Gate Drive Circuit for Display Panel Ghosting Prevention
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Solution Overview
Problem
Liquid crystal display (LCD) devices face issues with ghosting phenomena due to the long response time of liquid crystal molecules, particularly at the head and tail ends of the panel, leading to poor display effects, especially in the middle region, which affects user experience, especially in virtual reality applications.
Innovation Solution
A gate drive circuit with a first sub-circuit group and a second sub-circuit group that drive pixels row by row from a middle row to the edges, dispersing the regions with insufficient response time to the edge regions, ensuring that liquid crystal molecules in the middle region can deflect to the designated state, thus preventing ghosting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single gate drive circuit drives all N rows of pixels sequentially from the first row, then the device complexity is low, but the response time is insufficient for liquid crystal molecules to deflect to the designated state, causing ghosting phenomena
Solution Approach 1:
The gate drive circuit is divided into multiple independent sub-circuit groups, each capable of driving a portion of the pixel rows. This segmentation allows parallel driving of multiple row regions simultaneously, reducing the overall response time and preventing ghosting phenomena while maintaining manageable circuit complexity through modular design
2Reliability
If the gate drive circuit drives pixels row by row from the first row, then the device complexity is simple, but the middle region of the display panel experiences ghosting due to insufficient response time
Solution Approach 1:
Multiple sub-circuit groups are activated simultaneously to drive different row regions in parallel from the outset, rather than sequentially. This preliminary parallel action ensures that the middle region receives adequate response time for liquid crystal deflection, eliminating ghosting while maintaining simple circuit operation
3Reliability
If a gate drive circuit drives all rows sequentially, then the ease of operation is high, but the display effect in the middle region deteriorates due to ghosting
Solution Approach 1:
The display panel is divided into multiple row regions, each driven by an independent sub-circuit group operating in parallel. This segmentation enables simultaneous driving of multiple regions, improving overall driving speed and display effect while maintaining ease of operation through standardized sub-circuit modules
Solution Approach 2:
The gate drive circuit operates with periodic clock signals distributed to multiple sub-circuit groups, enabling synchronized parallel driving of different row regions. This periodic action maintains ease of operation through regular timing while significantly improving driving speed and eliminating middle region ghosting
Data Source
AI summary
Provided are a gate drive circuit and a driving method thereof, a display panel and a display device. The gate drive circuit includes a first sub-circuit group and a second sub-circuit group. The first sub-circuit group can drive the mth row to the first row of pixels of the N rows of pixels in the display panel row by row, and the second sub-circuit group can drive the (m+1)th row to the Nth row of pixels row by row. In addition, m is greater than 1 and less than N.