Narrow Frame Display Panel With Shared Signal Lines
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Solution Overview
Problem
Conventional display panels face challenges in achieving a narrow frame design due to the large number of touch signal terminals and traces required for touch detection, which increases frame width and production costs.
Innovation Solution
The display panel incorporates a design with switch units, first signal lines, and second signal lines, where a same first signal line corresponds to multiple electrode columns and a same second signal line corresponds to multiple electrode rows, reducing the number of signal terminals and traces, and allowing for a narrow-frame design by integrating switch units and signal lines in a way that each electrode column corresponds to a single first signal terminal and each electrode row corresponds to a single second signal terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each touch electrode piece is connected to an integrated circuit through a separate touch signal line, then touch detection functionality is achieved, but the number of traces and signal terminals increases, resulting in increased frame width
Solution Approach 1:
Multiple touch electrode pieces are electrically connected in parallel through shared signal lines. Specifically, multiple electrode pieces in the same column share a common first signal line, and multiple electrode pieces in the same row share a common second signal line, significantly reducing the total number of signal terminals and traces required
Solution Approach 2:
The signal lines serve multiple functions: they act as both touch detection electrodes and as control lines for switch units. The first signal lines connect to first poles of switch units while also serving as touch detection electrodes, and second signal lines control the switching operation, enabling one structure to perform multiple functions
2Reliability
If multiple signal terminals and traces are used for touch detection, then comprehensive touch detection coverage is achieved, but production costs increase
Solution Approach 1:
The patent merges multiple signal paths into shared signal lines. By connecting multiple electrode pieces to common signal lines through switch units, the total number of signal terminals is reduced, which directly lowers production costs while maintaining comprehensive touch detection coverage across the display panel
3Length of stationary object
If the number of traces and signal terminals is reduced for narrow frame design, then frame width decreases, but touch detection reliability may be compromised
Solution Approach 1:
The patent introduces switch units that can dynamically connect and disconnect electrode pieces to signal lines. During touch detection, the switch units are turned on to establish electrical connections, enabling flexible and reliable touch detection with fewer permanent traces and signal terminals, thus achieving narrow frame design without compromising reliability
Solution Approach 2:
The switch units are controlled to turn on and off periodically or as needed during touch detection operations. This periodic switching enables the system to establish connections only when required, reducing the need for continuous physical connections and allowing for fewer traces while maintaining detection reliability
Data Source
AI summary
A display panel, a driving method and a touch display device are provided. The display panel includes a display area and a non-display area. The display panel also includes a base substrate, a plurality of sub-pixels located in the display area and arranged in a first direction and a second direction, a plurality of electrode rows extending in the first direction and arranged in the second direction, a plurality of electrode columns arranged in the first direction and extending in the second direction, a plurality of switch units located in the display area, a plurality of first signal lines, a plurality of second signal lines, and a plurality of first driving circuits. In a touch stage, the first driving circuits supply a driving signal to the second signal lines, and the first signal lines transmit a touch detection signal to first electrodes in the electrode rows and columns.