U-Shaped Transistor Pixel Structure for Display Biasing Consistency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing pixel structures in display panels, particularly those using U-shaped and I-shaped thin film transistors, exhibit differences in electrical biasing, leading to display defects such as color mura and image sticking due to variations in transistor performance.
Innovation Solution
A pixel structure is designed with a scan line, data line, reference voltage line, first, second, and third transistors, and pixel electrodes, where the transistors' electrodes have straight line portions overlapping semiconductor patterns, with both ends of these portions located outside the normal projection regions, ensuring consistent electrical biasing and reducing display defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If U-shaped thin film transistors are used for charging pixel electrodes, then the transistor structure can be compact, but the electrical biasing becomes inconsistent with I-shaped transistors, causing display defects
Solution Approach 1:
The patent applies local quality by making the channel width non-uniform along the channel length. Specifically, the channel width is wider at the source and drain regions and narrower in the middle region. This local variation in channel width compensates for the electrical biasing differences between U-shaped and I-shaped transistors, allowing consistent display performance while maintaining the compact U-shaped structure.
2Adaptability or versatility
If different shaped transistors (U-shaped and I-shaped) are used for different pixel electrode functions, then functional requirements are met, but electrical biasing differences cause color mura and image sticking
Solution Approach 1:
The patent changes the geometric parameters of the transistor channel, specifically varying the channel width along its length. By making the channel width non-uniform (wider at ends, narrower in middle), the electrical characteristics are adjusted to achieve consistent biasing behavior across different transistor types, thereby eliminating color mura and image sticking while maintaining functional versatility.
Data Source
AI summary
A pixel structure includes a scan line, a data line, a reference voltage line, a first transistor, a second transistor, a third transistor, a first pixel electrode and a second pixel electrode. The reference voltage line is separated from the data line and intersected with the scan line. A first electrode of the second transistor, a second electrode of the second transistor and a first electrode of the third transistor have straight line portions overlapped with a second semiconductor pattern of the second transistor and a third semiconductor pattern of the third transistor. Both ends of each of the straight line portions are located outside a normal projection region of a first semiconductor pattern of the first transistor, a normal projection region of the second semiconductor pattern of the second transistor and a normal projection region of the third semiconductor pattern of the third transistor.