Segmented Source Structure for Display Panel Active Devices
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Solution Overview
Problem
The active devices in driving circuits of display panels experience high internal current density, leading to stress and stability issues, which can result in the failure of the display panel.
Innovation Solution
The active device design includes a semiconductor layer with a source having a trunk and branches forming recesses, where the width of the trunk is greater than the branches, reducing internal current density and enhancing stability and lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the active device uses a conventional source structure, then the device area is small, but the internal current density is high causing stress and stability deterioration
Solution Approach 1:
The source is divided into multiple source electrodes (first source electrode, second source electrode, third source electrode, fourth source electrode) arranged in parallel. This segmentation distributes the current flow across multiple paths, reducing the internal current density in each individual source electrode and mitigating stress effects while maintaining overall device functionality
Solution Approach 2:
The source electrodes are arranged in a two-dimensional configuration (parallel arrangement across the channel width) rather than a single linear source. This dimensional expansion increases the effective heat-dissipating area and provides multiple current distribution paths without significantly increasing the overall device footprint
2Productivity
If the active device carries considerable current to pixel array, then the driving function is achieved, but the internal current density increases causing stress effect
Solution Approach 1:
The source is segmented into multiple source electrodes that work in parallel to carry the considerable current required for driving the pixel array. This segmentation allows the total current to be distributed across multiple conductive paths, maintaining the required productivity while reducing the stress on individual electrodes
Solution Approach 2:
Multiple source electrodes are combined to form a composite source structure that collectively carries the load current. The parallel arrangement of source electrodes merges their current-carrying capabilities to achieve the required productivity while each individual electrode operates at lower current density for improved reliability
Data Source
AI summary
A display panel and an active device thereof are provided. The active device includes a gate, a semiconductor layer, a first source and a plurality of first drains. The first source includes a first side and a second side opposite to each other, the first side has a plurality of first recesses, and the second side has a plurality of second recesses. Each of the first recesses and a corresponding second recess are disposed opposite to each other to constitute a recess-pair. A minimum distance between the first recess and the second recess of each recess-pair is A, a minimum distance between two neighboring recess-pairs is B, wherein A is greater than B. The first drains are electrically connected to each other, and each of the first drains is respectively disposed in one of the recesses of the first source.