GOA Circuit Dummy Units for Fast Black Frame Insertion
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Solution Overview
Problem
Existing Gate Driver On Array (GOA) techniques fail to achieve fast black frame insertion when the control IC abnormally shuts down, leading to the need for all gate lines to be turned on to avoid afterimages.
Innovation Solution
A GOA circuit with cascaded units, including dummy and normal GOA units, where dummy units are not connected to the active area, and a cascaded signal is input into the dummy units to control the voltage levels, allowing for fast black frame insertion by isolating afterimages from the active area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all gate lines are turned on to achieve black frame insertion after abnormal shutdown, then afterimage is prevented, but the complexity of control increases and response speed decreases
Solution Approach 1:
The gate driver is segmented into normal GOA units connected to active area scan lines and dummy GOA units not connected to active area scan lines. This segmentation allows independent control of dummy units to generate black frame insertion signals without affecting the complexity of controlling all active gate lines simultaneously.
Solution Approach 2:
Dummy GOA units act as intermediary components that receive cascaded signals and generate black frame insertion control signals. These dummy units mediate between the cascaded signal input and the active area, enabling fast black frame insertion without requiring direct control of all active gate lines.
2Speed
If dummy GOA units are added to the circuit, then fast black frame insertion is enabled, but the device complexity increases
Solution Approach 1:
Dummy GOA units perform multiple functions: they receive cascaded signals, generate black frame insertion signals, and isolate afterimages from the active area. By consolidating these functions into dedicated dummy units, the overall system complexity is managed while achieving fast black frame insertion capability.
Solution Approach 2:
Dummy GOA units are essentially copies of the normal GOA unit structure but without connection to active area scan lines. This copying approach allows reuse of proven circuit designs while adding the specific functionality of fast black frame insertion without redesigning the entire gate driver.
3Reliability
If cascaded signals are input into dummy GOA units, then afterimages are isolated from active area, but the signal routing complexity increases
Solution Approach 1:
Instead of routing cascaded signals through all active GOA units and attempting to control them individually for black frame insertion, the invention inverts the approach by inputting cascaded signals into dummy GOA units that are specifically designed for this purpose. This inversion simplifies signal routing by using dedicated dummy units rather than repurposing the entire active gate driver chain.
Data Source
AI summary
The present invention teaches a Gate Driver on Array (GOA) circuit for a display panel. The GOA circuit includes a first dummy GOA unit and/or a second dummy GOA unit not connecting scan lines of the display panel's active area, and normal GOA units connecting scan lines of the active area. The normal GOA units are cascaded into a chain. The first dummy GOA unit is cascaded to a first normal GOA unit of the chain and/or the second dummy GOA unit is cascaded to a last normal GOA unit of the chain. A start signal of the display panel's vertical scanning as a cascaded signal is input into the first dummy GOA unit and/or the second dummy GOA unit. The GOA circuit excludes the line of afterimage from the active area, thereby allowing the fast black frame insertion after abnormal shutdown.