GOA Circuit Clock Masking for Redundant Pulse Elimination
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Solution Overview
Problem
The existing GOA circuit in liquid crystal display technology faces issues with redundant pulse signals on horizontal scanning lines due to bootstrap capacitance, leading to circuit malfunctions during startup and shutdown, which affects the charging of pixels and overall display performance.
Innovation Solution
A GOA circuit design that includes cascaded units driven by multiple clocks and control transistors to mask transfer clocks when all horizontal signal lines are charged, ensuring gate driving signals are discharged to a predetermined level, preventing redundant pulse signals before the first gate driving signals are outputted, thereby maintaining normal circuit operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the GOA circuit adopts All-Gate-on functions to charge horizontal scanning lines simultaneously, then the remaining charges for each pixel are cleaned to resolve blur issues, but redundant gate driving signals may cause circuit malfunction
Solution Approach 1:
The control module masks the transfer clocks before the GOA circuit starts operating, preventing redundant pulse signals from being generated in the first place. This preliminary action avoids the need for subsequent cleanup operations and ensures clean signal transitions during startup and shutdown.
Solution Approach 2:
The control module acts as an intermediary between the clock signals and the GOA units, selectively masking transfer clocks based on the operational state. This intermediary controls which clocks are transmitted to prevent harmful redundant signals while allowing necessary clocks to pass through for normal operation.
2Productivity
If the transfer clocks are continuously transmitted to drive GOA units, then the horizontal scanning lines can be charged, but redundant pulse signals are generated on the lines before the first gate driving signals are outputted
Solution Approach 1:
The control module performs preliminary masking of transfer clocks before the GOA circuit begins operation. This ensures that when the circuit starts, no redundant pulse signals are generated on the horizontal scanning lines, while still allowing rapid charging when needed.
Solution Approach 2:
The system dynamically adjusts the transmission of transfer clocks based on operational state. The control module masks or unmasks clocks in real-time, allowing fast charging during normal operation while preventing redundant signals during startup and shutdown transitions.
3Reliability
If the GOA circuit masks transfer clocks to prevent redundant pulse signals, then circuit operation is ensured, but additional control complexity is introduced
Solution Approach 1:
The control module performs multiple functions: masking transfer clocks, controlling gate driving signals, and managing bootstrap capacitance discharge. By consolidating these functions in a single module, the design avoids adding separate complex circuits for each function, thus limiting the increase in overall system complexity.
Solution Approach 2:
The control module automatically detects the operational state of the GOA circuit and adjusts clock masking accordingly. This self-service capability eliminates the need for external control logic or additional sensors, maintaining simplicity while ensuring reliable operation.
Data Source
AI summary
A GOA circuit and LCD are disclosed. The GOA circuit includes cascaded GOA units and a control module. Each of the GOA units is driven by a first level of transfer clock, a second level of transfer clock, a first control clock and a second control clock to charge horizontal signal lines corresponding to a display area. The control module masks the first level of transfer clock and the second level of transfer clock when all of the horizontal signal lines are charged completely by the GOA circuit, such that the gate driving signals on the horizontal signal lines are discharged until the level equals to the predetermined level. In this way, the horizontal signal lines are prevented from generating redundant pulse signals before the first gate driving signals are outputted, which ensures the normal operations of the GOA circuit.