Under-Display Camera Wiring Overlap for Higher Optical Transmittance
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Solution Overview
Problem
Organic EL display devices with integrated image capturing units suffer from insufficient optical transmittance, leading to dark images due to the structure of the display panel.
Innovation Solution
The display device incorporates a design where the second wiring lines overlap the first wiring lines in the area containing the image capturing unit, improving optical transmittance by optimizing the layout of the wiring layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the display panel includes multiple wiring lines stacked in order to achieve the display function, then the display device can be manufactured with standard TFT layer structure, but the optical transmittance in the image capturing area becomes insufficient
Solution Approach 1:
The patent applies local quality by making the wiring line layout specific to the image capturing area different from other areas. In the image capturing area, the second wiring lines are arranged to overlap the first wiring lines, creating a localized structural modification that improves optical transmittance where needed without affecting the overall display functionality.
Solution Approach 2:
The patent utilizes the vertical stacking dimension of the TFT layer structure. By arranging wiring lines in multiple stacked layers (first wiring lines and second wiring lines at different heights), the patent creates overlapping patterns in plan view that reduce the effective optical path length through opaque materials, thereby improving transmittance while maintaining the three-dimensional structural integrity of the display panel.
2Adaptability or versatility
If the image capturing unit is placed on the rear side of the display panel to capture images through the display area, then the device integration is improved, but the captured images become dark due to insufficient light transmission
Solution Approach 1:
The patent modifies the wiring line configuration specifically in the image capturing area to improve light transmission for the rear-side camera. This localized structural adjustment allows the integrated image capturing function to receive sufficient light while maintaining the overall integrated design.
3Illumination intensity
If the second wiring lines are arranged to overlap the first wiring lines in the image capturing area, then the optical transmittance is improved, but the wiring layout complexity increases
Solution Approach 1:
The patent applies partial action by implementing the overlapping wiring configuration only in the image capturing area rather than across the entire display panel. This selective application improves optical transmittance where needed while minimizing the increase in overall wiring layout complexity.
Data Source
AI summary
A display device includes: a display panel including: a base substrate; a thin film transistor layer provided on the base substrate and including a semiconductor layer, a gate insulation film, a plurality of first wiring lines, an interlayer insulation film, and a plurality of second wiring lines, all of which are stacked in a stated order; a light-emitting element layer provided on the thin film transistor layer; and a sealing film provided on the light-emitting element layer; and an image capturing unit provided on a base substrate side of the display area of the display panel, wherein in a plan view, the plurality of second wiring lines, in an area overlapping the image capturing unit, have portions respectively overlapping the plurality of first wiring lines.