Display Device Gate Line Segmentation for Voltage Coupling Reduction
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Solution Overview
Problem
Display devices face challenges in minimizing voltage coupling between pixel electrodes and transistors, leading to color differences and color cast phenomena at boundaries, which affect display quality and opening ratio.
Innovation Solution
The display device incorporates a specific configuration of gate lines, auxiliary lines, and data lines, where the first and second pixels have transistors with overlapping gate electrodes and drain/source electrodes, and data lines are oriented oppositely to reduce voltage coupling and color cast, enhancing the opening ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a node connected to a pixel electrode of one pixel overlaps with a node connected to a gate electrode of another pixel, then device integration is achieved, but voltage coupling occurs causing color differences and color cast phenomena
Solution Approach 1:
The patent introduces a shielding electrode as an intermediary element positioned between the pixel electrode and the gate electrode of the adjacent pixel. This shielding electrode acts as a mediator to block the capacitive coupling effect, preventing voltage from the gate electrode from inducing unwanted voltage on the pixel electrode of the neighboring pixel, thereby eliminating color cast phenomena while maintaining the overlapping node configuration for device integration
2Illumination intensity
If the opening ratio is increased to improve display quality, then color differences caused by coupling become more significant
Solution Approach 1:
The shielding electrode serves as a protective intermediary that enables higher opening ratios without suffering from color uniformity issues. By blocking the capacitive coupling path, the shielding electrode allows the pixel electrode to extend closer to the transistor elements, increasing the opening ratio and thus display quality, while preventing the color cast that would normally result from such proximity
3Manufacturing precision
If data lines are oriented in opposite directions, then voltage coupling between pixels is reduced, but device complexity increases
Solution Approach 1:
The patent segments the gate line into a main line and auxiliary lines that extend in opposite directions to connect with data lines. This segmentation allows each data line to be oriented in opposite directions relative to the pixel, creating symmetrical voltage distribution that reduces coupling effects. The segmented gate line structure manages the increased device complexity by organizing the opposite-direction orientation in a systematic manner
Data Source
AI summary
A display device includes: a first gate line including: a main line; and first and second auxiliary lines protruding from the main line; and first and second pixels, each including a first transistor. The first transistor of each of the first and second pixels includes: a first active region; a first drain electrode on one side of the first active region; a first source electrode on another side of the first active region; and a first gate electrode overlapping with the first active region. The first gate electrodes of the first and second pixels are respectively connected to the first and second auxiliary lines.