Display Device Connection Wirings Thin Bezel Routing
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Solution Overview
Problem
Display devices with thin bezels face challenges in routing signal wirings due to reduced space, leading to potential changes in data signal order and luminance differences between active and non-active regions caused by process dispersion in conductive layers.
Innovation Solution
The display device incorporates connection wirings that pass through the active region, using alternating conductive layers for non-active fan-out wirings and signal wirings, allowing for a general-purpose driver chip and minimizing luminance differences by even distribution of data lines across regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the area of the non-active region is reduced to realize a thin bezel, then the bezel thickness is reduced, but there are fewer paths for fanned-out wirings to pass through
Solution Approach 1:
The patent utilizes multiple conductive layers (first conductive layer, second conductive layer, third conductive layer) to route wirings in the vertical dimension. This allows fanned-out wirings to pass through the active region by switching layers, effectively adding a dimensional pathway when the horizontal non-active region area is reduced.
Solution Approach 2:
The patent employs a multi-layer conductive structure where wirings are nested across different conductive layers. The first non-active fan-out wirings (first conductive layer) and second non-active fan-out wirings (second conductive layer) are alternately arranged and connected through the third conductive layer, creating a nested wiring architecture that maximizes space utilization.
2Device complexity
If fanned-out wirings are made to pass through the active region, then wiring paths are secured in thin-bezel structures, but the order of data signals may be changed
Solution Approach 1:
The patent pre-establishes a systematic wiring arrangement where first non-active fan-out wirings and second non-active fan-out wirings are alternately arranged along the second direction. This preliminary organized structure ensures that even when wirings pass through the active region, the data signal order is maintained through consistent alternating patterns across all conductive layers.
Solution Approach 2:
The patent applies different wiring arrangements to different regions: in the non-active region, first and second non-active fan-out wirings are alternately arranged; in the active region, signal wirings and active fan-out wirings follow corresponding alternating patterns. This localized quality control ensures data signal order is preserved despite regional differences in wiring paths.
3Adaptability or versatility
If signal wirings include different conductive layers in each region, then wiring flexibility is improved, but luminance differences occur due to process dispersion
Solution Approach 1:
The patent assigns specific conductive layers to specific regions: first non-active fan-out wirings (first conductive layer) and second non-active fan-out wirings (second conductive layer) are alternately arranged in the non-active region, while signal wirings (third conductive layer) and active fan-out wirings (fourth conductive layer) follow corresponding patterns in the active region. This localized assignment minimizes luminance differences by ensuring consistent process conditions within each region.
Solution Approach 2:
The patent segments the display device into non-active region and active region, with each region having its own optimized wiring configuration. The non-active region uses first and second conductive layers for fan-out wirings, while the active region uses third and fourth conductive layers for signal and active fan-out wirings. This segmentation allows each region to be optimized independently, reducing overall luminance variation.
Data Source
AI summary
A display device includes: an active region including pixels that receive data signals from data lines, the pixels being arranged in a matrix formation; a non-active region adjacent to the active region in a first direction and including a pad portion, the non-active fan-out wirings being in the non-active region and connected to the pad portion; signal wirings extending in the first direction, crossing the active region, and being connected to the pixels; and connection wirings at least partially passing through the active region and connecting some of the non-active fan-out wirings to some of the signal wirings, respectively. The non-active fan-out wirings include first non-active fan-out wirings made of a first conductive layer, and second non-active fan-out wirings made of a second conductive layer different from the first conductive layer. The first and second non-active fan-out wirings being alternately arranged along a second direction intersecting the first direction.