Touch Routing Layout for Narrow-Bezel Display Panels
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Solution Overview
Problem
Existing display devices face challenges in achieving a larger screen-to-device ratio due to the limitations of the non-display area, particularly in minimizing the bezel width, which affects the overall design and functionality of devices like smartphones and tablets.
Innovation Solution
The display apparatus modifies the configuration of the touch routing line in the non-display area by extending touch pads closer to the display area and incorporating a cutting surface, reducing the width of the bezel area through strategic modifications in the touch structure and encapsulation design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the non-display area is minimized to reduce bezel width, then the screen-to-device ratio is improved, but the complexity of routing lines and touch structures increases
Solution Approach 1:
The routing lines are configured to extend in multiple dimensions through the encapsulation structure, utilizing vertical stacking and lateral extension to achieve compact routing. The touch pads are positioned at different heights and locations, with routing lines extending both horizontally and vertically to connect components, thereby reducing the horizontal footprint and bezel width.
Solution Approach 2:
The routing lines are nested within and around the encapsulation structure, with some routing lines positioned inside the encapsulation and others extending from its edges. The touch pads are nested within the non-display area, and routing lines are routed through multiple layers and structures to achieve compact integration without increasing overall device area.
2Area of moving object
If the touch routing line area is reduced to minimize bezel width, then the screen-to-device ratio is improved, but the reliability of the touch structure may be compromised
Solution Approach 1:
Different regions of the touch structure are designed with different properties. The touch pads are positioned at specific locations with optimized dimensions, and routing lines are configured with appropriate widths and spacing in different areas. The encapsulation structure provides localized protection and insulation, ensuring reliable electrical connections while maintaining a compact overall design.
3Adaptability or versatility
If the encapsulation structure is extended into the non-display area to support routing lines, then the routing capability is improved, but the manufacturing complexity increases
Solution Approach 1:
The encapsulation structure serves multiple functions: it provides insulation and protection for the light emitting diode, acts as a support structure for routing lines, and defines the boundary between display and non-display areas. By making the encapsulation structure multi-functional, additional routing capabilities are achieved without adding separate structural elements, thereby limiting the increase in manufacturing complexity.
Data Source
AI summary
A display apparatus includes a display area and a non-display area, wherein the non-display area includes a pad area and a bending area. The display apparatus includes a dam in the non-display area surrounding the display area; an encapsulation unit having a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer, a first touch buffer layer on the encapsulation unit with a touch connection electrode thereon; a second touch buffer layer on the touch connection electrode with a touch electrode thereon; a touch routing line connected to a touch pad electrode of the pad area and the touch electrode, the touch routing line having an upper routing line and a lower routing line. The first inorganic encapsulation layer, the second inorganic encapsulation layer, the first touch buffer layer, and the second touch buffer layer extend into the non-display area beyond the dam.