Gate Line Overlap Control for Signal Delay in Array Substrates
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Solution Overview
Problem
In thin film transistor liquid crystal displays (TFT-LCDs), gate signal delay occurs due to the overlap of gate lines with common electrodes, leading to light leakage and contrast ratio loss, which is not adequately addressed by existing technologies.
Innovation Solution
An array substrate design that includes gate line overlap parts, where a driver is electrically connected to these parts to either make them floating or equal to the gate line potential during potential changes, thereby minimizing signal delay and voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If gate lines overlap with common electrodes to improve aperture ratio, then aperture ratio is improved, but gate signal delay occurs causing light leakage and contrast ratio loss
Solution Approach 1:
The gate line overlap part is segmented from the common electrode through electrical connection control. The driver separately controls the potential of the gate line overlap part, allowing independent management of the overlapping region's electrical state to prevent signal delay while maintaining the aperture ratio benefit of the overlap structure.
Solution Approach 2:
The patent changes the electrical parameter (potential state) of the gate line overlap part dynamically. By adjusting the potential to match the gate line potential during signal transitions or placing it in floating state, the harmful capacitive coupling effect is minimized, resolving the gate signal delay issue while preserving the structural overlap for aperture ratio.
2Area of stationary object
If gate line overlap parts are present to increase display area, then display area is increased, but light leakage occurs due to voltage fluctuations
Solution Approach 1:
The patent dynamically changes the potential parameter of the gate line overlap part during gate signal transitions. By making the potential equal to the gate line potential or placing it in floating state, voltage fluctuations are minimized, which directly reduces the capacitive coupling that causes light leakage while maintaining the increased display area benefit.
3Device complexity
If gate line overlap parts are connected to common electrode to simplify structure, then structure is simplified, but contrast ratio is reduced due to signal interference
Solution Approach 1:
The patent introduces dynamic control of the gate line overlap part's electrical state through the driver. The potential state is dynamically adjusted during gate signal transitions (making it equal to gate line potential or floating), which prevents signal interference and maintains contrast ratio while keeping the structural connection simplified.
Data Source
AI summary
An array substrate, a display device and a driving method thereof are provided. The array substrate includes a base substrate, a driver provided on the base substrate, a plurality of gate lines and a plurality of gate line overlap parts, each of the gate line overlap parts has a portion which overlaps a corresponding gate line of the gate lines in a direction perpendicular to the base substrate; the driver is connected with the plurality of the gate line overlap parts and is configured to, at one or both of a time when a potential of the gate line is changed from a turn-on potential to a turn-off potential and a time from the turn-off potential to the turn-on potential, make the gate line overlap part in a floating state, or make the potential of the gate line overlap part equal to the changed potential.