TFT Substrate Wiring Layout for In-Panel Fanout and Low Mura
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The non-active area in electronic devices is relatively large, limiting the increase in screen-to-body ratio due to the unavoidable size of the lower fanout area between the active area and the display driver chip, which cannot be compressed or bent.
Innovation Solution
A TFT substrate with a wiring layer that replaces the lower fanout area, connecting data lines to the display driver chip, and includes separate metal wires to avoid data crosstalk and reduce display mura, thereby reducing the non-active area and enhancing the screen-to-body ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the non-active area is compressed to increase screen-to-body ratio, then the screen-to-body ratio is improved, but the lower fanout area cannot be reduced and remains relatively large
Solution Approach 1:
The patent moves the fanout function from the lower non-active area to the active area by implementing fanout wires within the pixel array region. This dimensional repositioning allows the fanout area to be integrated into the active display area, eliminating the need for a separate lower fanout region and thereby increasing the screen-to-body ratio.
Solution Approach 2:
The patent merges the fanout function with the active display area by routing fanout wires through the pixel array. This consolidation combines previously separate functional areas (fanout region and active display region) into a unified structure, eliminating the need for a dedicated lower fanout area.
2Area of stationary object
If fanout wires are routed through the active area, then the lower fanout area is eliminated, but data crosstalk and display mura may occur
Solution Approach 1:
The patent applies different characteristics to different segments of the fanout wires. Specifically, it uses separate metal wires for different data lines with optimized routing patterns and spacing in different regions of the active area. This local differentiation minimizes electromagnetic interference and prevents data crosstalk while maintaining the fanout function within the active area.
Solution Approach 2:
The patent divides the fanout wire structure into separate metal wire segments, each dedicated to specific data lines. This segmentation isolates signal paths, reducing electromagnetic coupling between adjacent data lines and preventing display mura caused by interference.
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
Embodiments of this application provide a TFT substrate, a display module, and an electronic device. The TFT substrate includes a base, a first active layer, a first source drain layer, a first gate, a plurality of data lines, and a wiring layer. The wiring layer is disposed on a side that is of the first source drain layer and that is away from the base. The wiring layer includes a plurality of first metal wires. One end of each of the plurality of first metal wires is coupled to each of the plurality of data lines, and the other end of each of the plurality of first metal wires is used to be coupled to a display driver chip. The wiring layer may replace a lower fanout area in an active area AA in the electronic device, and is configured to connect the data line and the display driver chip in the TFT substrate, to provide an image signal required for display to the TFT substrate. In this way, fanout in the active area AA may be implemented, so that the lower fanout area of a display module of the electronic device no longer occupies a non-active area, thereby reducing a size of the non-active area and increasing a screen-to-body ratio of the electronic device.