Array Substrate TFT Layout for Uniform Sub-Pixel Brightness
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Solution Overview
Problem
The existing manufacturing process for thin film transistors (TFTs) in display panels results in uneven channel widths due to exposure differences at prism connections, affecting the voltage-dividing ratio and brightness of sub-pixels, leading to an uneven display.
Innovation Solution
The array substrate design includes a first TFT with multiple subchannels and semiconductor sublayers, increasing the number of openings and reducing the impact of exposure variations at prism connections, thereby stabilizing the channel width ratio and brightness of sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional single-channel TFT structure is used, then the manufacturing process is simple, but the channel width is highly sensitive to exposure variations at prism connections, causing large changes in voltage-dividing ratio and sub-pixel brightness
Solution Approach 1:
The first channel is divided into multiple subchannels (first subchannel and second subchannel) with corresponding semiconductor sublayers. This segmentation reduces the sensitivity of each individual channel width to exposure variations, as the cumulative effect of multiple narrower channels is more stable than a single wide channel. The patent applies this by configuring the first TFT with multiple subchannels while the second TFT has a single channel, creating a structured approach to reduce brightness unevenness.
2Reliability
If the number of subchannels is increased, then the resistance to exposure variation is improved, but the device structure and manufacturing complexity increase
Solution Approach 1:
The patent applies local quality by differentiating the channel structures between the first TFT and second TFT. The first TFT (voltage-dividing TFT) has multiple subchannels optimized for stability against exposure variation, while the second TFT (sub-pixel TFT) has a single channel. This localized differentiation allows the system to achieve overall brightness uniformity without unnecessarily complicating the entire TFT structure.
Data Source
AI summary
The present disclosure provides an array substrate and a display panel including the same. The array substrate includes a plurality of pixel units. Each of the pixel units includes a main pixel electrode, a sub-pixel electrode, a first thin film transistor (TFT) electrically connected to the sub-pixel electrode, a second TFT electrically connected to the first TFT, and a third TFT electrically connected to the main pixel electrode. The first TFT includes a first channel and a first semiconductor layer. The first channel includes two or more subchannels. The first semiconductor layer includes two or more semiconductor sublayers. Each of the semiconductor sublayers is disposed in a corresponding subchannel.