Display Panel Touch Drive Electrode Layout for Narrow Frame
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Solution Overview
Problem
In display panels with capacitive touch control, the large resistance and area of common electrodes lead to long charging times for touch drive signals, necessitating wider frames due to the requirement for larger touch drive waveform generation circuits.
Innovation Solution
The touch drive electrodes are arranged in the color filter substrate, increasing the distance to the source electrode and first metal, reducing load capacitance and allowing for smaller touch drive waveform generation circuits, enabling narrower frames by placing two groups of waveform generation circuits at both ends of the touch drive electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the common electrode is used as a touch drive electrode, then the capacitive touch control function is achieved, but the resistance and area of the electrode increase leading to long charging time
Solution Approach 1:
The patent divides the touch drive waveform generation into multiple independent circuits distributed at both ends of the array substrate. Each waveform generation circuit serves a specific region, allowing parallel operation and reducing the overall charging time for touch drive signals across the entire display panel.
Solution Approach 2:
The patent transitions from using a single planar common electrode to a three-dimensional distributed architecture with multiple waveform generation circuits positioned at both ends of the array substrate. This spatial distribution reduces the effective distance for signal charging and reduces the RC time constant.
2Power
If a larger touch drive waveform generation circuit is used to reinforce driving capability, then the touch drive signal can be generated with sufficient strength, but the frame area increases leading to a wider frame
Solution Approach 1:
The patent segments the single large waveform generation circuit into multiple smaller circuits distributed at both ends of the array substrate. Each smaller circuit serves a specific region, providing sufficient driving capability locally while reducing the total area occupied in the frame region.
Solution Approach 2:
The patent introduces intermediate waveform generation circuits positioned at both ends of the array substrate as mediators between the signal source and the touch drive electrodes. These intermediary circuits distribute the driving burden and reduce the area requirement for any single circuit while maintaining overall driving capability.
Data Source
AI summary
A display panel and a display device are disclosed. The display panel includes a color filter substrate and an array substrate disposed opposite to each other and a liquid crystal layer located therebetween; the color filter substrate includes a plurality of touch drive electrodes parallelly arranged along a first direction; the array substrate comprises two groups of waveform generation circuits, which are respectively arranged at both ends of the touch drive electrodes, located in a frame area of the array substrate, where each group of waveform generation circuits comprises a plurality of touch drive waveform generation circuits, the touch drive electrode is electrically connected with one or more of the touch drive waveform generation circuits, and the plurality of touch drive waveform generation circuits are configured for generating touch drive signals and providing the generated touch drive signals to the touch drive electrodes.