Display Panel Third Conductive Layer Bridge Resistance Fluctuation
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Solution Overview
Problem
Display panels face issues with low gray-scale uniformity and uneven brightness due to high sheet resistance and fluctuations in conductive trace film thickness and size, leading to mura problems like uneven display brightness and graininess.
Innovation Solution
A display panel design featuring a base substrate with multiple transistors connected through a third conductive layer with bridge portions, where the sheet resistance of the third conductive layer is lower than the via-hole connection portions, reducing resistance fluctuations and improving uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive traces are used to connect transistors in the active layer, then transistor connectivity is achieved, but sheet resistance is large and resistance fluctuation is high
Solution Approach 1:
The conductive path is segmented into multiple components: via-hole connection portions in the active layer and bridge portions in the third conductive layer. This segmentation allows each component to be optimized independently, with the bridge portions providing low resistance connections between active portions while the via-holes maintain necessary connectivity.
Solution Approach 2:
The patent introduces a vertical dimension by using multiple conductive layers (first conductive layer, second conductive layer, and third conductive layer) stacked above the active layer. The bridge portions in the third conductive layer extend horizontally across the substrate, creating a three-dimensional conductive pathway that reduces resistance by utilizing both vertical and horizontal dimensions.
2Ease of manufacture
If conductive trace film thickness and size vary, then manufacturing flexibility is improved, but resistance fluctuation increases causing mura problems
Solution Approach 1:
The bridge portions in the third conductive layer serve as intermediary elements that connect the active portions. These bridge portions are specifically designed to have low sheet resistance, acting as mediators that compensate for variations in the active layer conductive traces. The via-hole connection portions also function as intermediaries, providing stable connection points between layers.
3Strength
If via-hole connection portions are used to connect active portions, then structural integrity is maintained, but sheet resistance is higher than ideal
Solution Approach 1:
The patent merges the functionality of multiple conductive layers by integrating via-hole connection portions in the active layer with bridge portions in the third conductive layer. This combination creates a hybrid conductive pathway where the via-holes provide structural integrity and the bridge portions provide low resistance, achieving both structural and electrical performance goals simultaneously.
Data Source
AI summary
The present disclosure provides a display panel and a display device. The display panel includes: a base substrate, a first active layer on a side of the base substrate, and a third conductive layer on a side of the first active layer away from the base substrate. The first active layer includes active portions spaced apart, wherein each active portion includes a sub-active portion and a via-hole connection portion connected to each other, and the sub-active portion is disposed corresponding to a transistor of two or more transistors, and configured to form a channel region of the corresponding transistor. The third conductive layer includes at least one bridge portion, wherein the at least one bridge portion is connected to via-hole connection portions in different active portions through via holes, respectively. A sheet resistance of the third conductive layer is less than a sheet resistance of the via hole connection portion.