Integrated Touch Display Panel with Step Compensation Routing
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Solution Overview
Problem
Existing display devices face challenges in disposing touch electrodes and touch connection lines due to structural issues, leading to potential short circuits or disconnections, especially in areas with modules like cameras or sensors.
Innovation Solution
The integration of a step compensation layer between touch routing lines and blocking structures in the display panel, which alleviates the high steps caused by the blocking structures, thereby reducing surface irregularities and preventing disconnection of touch routing lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch electrodes and touch connection lines are disposed on the encapsulation unit, then the touch sensor can be integrated with the display panel, but the touch routing lines may be shorted or disconnected due to high steps caused by blocking structures
Solution Approach 1:
A planarization layer is introduced as an intermediary between the blocking structure and the touch routing line. This planarization layer fills in the high steps created by the blocking structure, providing a flat surface for the touch routing line to be disposed on, thereby preventing short circuits and disconnections while maintaining the integrated touch sensor design
Solution Approach 2:
The surface profile parameter of the encapsulation unit is changed by adding the planarization layer. The high steps created by the blocking structure are filled, transforming the surface from an irregular profile to a flat profile in the region where the touch routing line is disposed, thereby ensuring reliable electrical connections
2Stability of the object's composition
If blocking structures are disposed in the non-display area to enclose the display area, then the display panel structure is stabilized, but high steps are caused which lead to surface irregularities and touch line failures
Solution Approach 1:
The planarization layer acts as a mediator between the blocking structure and the touch routing line. It fills the high steps created by the blocking structure, providing a flat surface for the touch routing line while allowing the blocking structure to remain in place for structural stability
Solution Approach 2:
The encapsulation unit is segmented into multiple functional layers: the blocking structure that provides structural stability, the planarization layer that provides surface flatness, and the touch routing line layer that provides electrical connections. This segmentation allows each layer to perform its specific function without interfering with others
Data Source
AI summary
A light emitting display device with an integrated touch screen includes: a substrate which includes a display area in which a plurality of display pixels is disposed and a non-display area around the display area; a light emitting diode in the display area; an encapsulation unit which covers the display area and the non-display area; a touch electrode line on the encapsulation unit; a touch routing line which is disposed in the non-display area and is connected to the touch electrode line; a plurality of blocking structures which is disposed in the non-display area and is configured to enclose the display area; and a step compensation layer disposed between the encapsulation unit and the touch routing line; wherein the step compensation layer reduces a step caused by the plurality of blocking structures to reduce irregularities of a surface of the encapsulation unit.