Integrated Light-Emitting Display Touch Routing with Step Compensation
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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 shorting or disconnection, especially in areas with blocking structures like camera sensors or proximity sensors.
Innovation Solution
A light emitting display device with an integrated touch screen incorporates a substrate with a display area, non-display area, and opening areas, featuring touch electrodes and routing lines, along with blocking structures and a step compensation layer to alleviate surface irregularities caused by blocking structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If touch electrodes and routing lines are formed on the encapsulation unit in an integrated structure, then manufacturing complexity is reduced, but the risk of touch line shorting increases due to steps caused by blocking structures
Solution Approach 1:
A planarization layer is introduced as an intermediary between the encapsulation unit and the touch routing lines. This planarization layer fills in the steps created by blocking structures (camera sensors, proximity sensors) to create a flat surface, allowing the touch routing lines to be formed without risk of shorting while maintaining the integrated structure.
Solution Approach 2:
The solution addresses the vertical dimension (step height) by adding a planarization layer that extends in the vertical direction to fill gaps. This transforms the three-dimensional step structure into a two-dimensional flat surface, enabling reliable routing line formation.
2Adaptability or versatility
If blocking structures (camera sensor, proximity sensor) are disposed in the non-display area, then device functionality is improved, but surface irregularities are created that cause touch line disconnection
Solution Approach 1:
The planarization layer acts as a mediator between the blocking structures and the touch routing lines. It compensates for the surface irregularities created by the blocking structures, allowing both the sensor functionality and touch operation reliability to coexist.
Solution Approach 2:
The planarization layer changes the surface profile parameter from irregular (with steps) to regular (flat), eliminating the geometric parameter that caused the routing line disconnection while preserving the blocking structures' functional position.
3Ease of manufacture
If touch routing lines are disposed on blocking structures, then connectivity is achieved, but the lines are prone to shorting due to step structures
Solution Approach 1:
The planarization layer serves as a stable intermediary surface that enables precise routing line placement. Without this layer, the steps created by blocking structures would make it difficult to maintain consistent routing line thickness and positioning, leading to manufacturing precision issues.
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.