Touch Control Display Panel Narrow Border Design
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Solution Overview
Problem
Touch control display panels face challenges in minimizing the area occupied by touch control lines in the non-display region, which increases the non-display region's area and contradicts the trend of narrow borders.
Innovation Solution
The design incorporates a substrate with a display region and non-display regions, featuring an organic light-emitting structure, a thin film encapsulation layer, and retaining walls, where touch control electrodes and lines are strategically positioned to reduce the area occupied by touch control lines by electrically connecting them to conductive leads outside the retaining walls, thereby minimizing the need for through-holes in the encapsulation layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a large number of touch control lines are disposed in the non-display region to electrically connect to touch control electrodes, then the touch control function is realized, but the area of the non-display region increases and narrow borders cannot be achieved
Solution Approach 1:
The patent utilizes the vertical dimension by disposing conductive leads on the first side of the thin film encapsulation layer and having touch control lines step across the retaining wall to connect to these leads. This three-dimensional routing approach reduces the horizontal space required in the non-display region, enabling narrow borders while maintaining complete electrical connectivity for the touch control function.
Solution Approach 2:
The patent introduces conductive leads as intermediary elements disposed on the first side of the thin film encapsulation layer. These leads serve as intermediate connection points that receive electrical signals from touch control lines and transfer them to the driving chip or FPC, thereby reducing the burden on the non-display region area while ensuring complete electrical connectivity.
2Reliability
If touch control lines are routed through the thin film encapsulation layer to the non-display region, then electrical connection is achieved, but the oxygen and moisture barrier properties of the encapsulation layer are compromised
Solution Approach 1:
The patent extracts the electrical connection function from the thin film encapsulation layer by disposing conductive leads on its first side and routing touch control lines to connect to these leads outside the encapsulation layer. This separation allows the encapsulation layer to maintain its continuous structure and oxygen-moisture barrier properties while still achieving the necessary electrical connectivity through the retained wall-stepping mechanism.
Solution Approach 2:
The conductive leads disposed on the first side of the thin film encapsulation layer serve as intermediary connection elements. They receive electrical signals from the touch control lines and transfer them to the driving chip or FPC, thereby enabling electrical connection without requiring the touch control lines to penetrate through the encapsulation layer, thus preserving its barrier properties.
3Area of stationary object
If the non-display region area is reduced for narrow borders, then aesthetic appearance is improved, but the area available for disposing touch control lines is insufficient
Solution Approach 1:
The patent employs vertical routing by having touch control lines step across the retaining wall to connect to conductive leads disposed on the first side of the encapsulation layer. This three-dimensional approach allows electrical connections to be established without requiring additional horizontal space in the non-display region, thus enabling narrow borders while maintaining ease of manufacture.
Data Source
AI summary
A touch control display panel and a touch control display device are provided. The touch control display panel comprises a substrate including a display region and a non-display region; an organic light-emitting structure; a thin film encapsulation layer having a first side facing the substrate; a first retaining wall; first and second touch control electrodes; first and second touch control lines disposed in the non-display region; and conductive leads disposed on the first side of the thin film encapsulation layer. At least one first touch control line steps across the first retaining wall to be electrically connected to a corresponding conductive lead, and further electrically connected to a driving chip or a flexible printed circuit disposed in a first non-display region through the corresponding conductive lead. A connection region of the at least one first touch control line and the corresponding conductive lead is arranged outside the first retaining wall.