Align Mark Overlap with Signal Lines to Reduce Bezel Dead Space
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Solution Overview
Problem
The challenge in display devices is to minimize the dead space in the non-display area caused by align marks, which hinders the reduction of the bezel size and maximization of the display area, as existing designs often result in inefficient use of space due to the placement and design of these marks.
Innovation Solution
The solution involves adjusting the pitch of signal lines relative to the align marks, positioning them to overlap or be adjacent to the outermost lines, and optimizing the density and shape of the align marks to reduce the dead space, allowing for greater light transmittance and improved assembly precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If align marks are provided in the non-display area of the display panel, then assembly location recognition is enabled, but dead space occurs in the non-display area
Solution Approach 1:
The align mark is merged with the outermost signal line by positioning them to overlap or be adjacent to each other. This integration allows the align mark to share the space occupied by the signal line, thereby eliminating the need for separate dedicated space for the align mark and reducing dead space in the non-display area.
Solution Approach 2:
The align mark is positioned in the vertical dimension (overlapping with signal lines in the plan view) rather than requiring additional horizontal space. By utilizing the vertical stacking capability of the display device layers, the align mark can be placed without increasing the lateral footprint, thus reducing dead space while maintaining assembly recognition functionality.
2Illumination intensity
If the pitch of signal lines is increased to reduce dead space, then light transmittance is improved, but signal line density is reduced
Solution Approach 1:
The signal line pitch is optimized locally in different regions. In the non-display area where align marks are positioned, a larger pitch is used to facilitate align mark placement and improve light transmittance. In the display area, a smaller pitch is maintained to ensure sufficient signal line density for proper device operation. This localized differentiation resolves the contradiction between light transmittance and signal line density.
Data Source
AI summary
A display device including a base substrate including a display area and a non-display area positioned at a side of the display area; at least one transistor in the display area of the base substrate and conductive lines in the non-display area of the base substrate; at least one light-emitting element in the display area that is coupled to the at least one transistor; an encapsulation layer covering the light-emitting element; a sensing electrode on the encapsulation layer and a sensing line on the encapsulation layer coupled to the sensing electrode; and an align mark on the encapsulation layer at least partially overlapping some of the conductive lines in the non-display area, in a plan view.