Pixel Electrode Shielding for Display Voltage Coupling
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Solution Overview
Problem
Display devices face challenges in minimizing voltage coupling between adjacent pixels and edge discoloration at the boundary between white and black, which affects display quality and efficiency.
Innovation Solution
The design includes a specific arrangement of pixels with overlapping electrodes and a shielding electrode to reduce voltage coupling and edge discoloration, where the first end of the source electrode of one pixel faces the third end of the capacitor electrode of another pixel, with a shielding electrode between them, and a protrusion portion on the voltage line to minimize coupling phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If nodes connected to gate electrodes of adjacent pixels are arranged close to each other to reduce device complexity, then device complexity is reduced, but voltage coupling between pixels increases causing display quality degradation
Solution Approach 1:
A shielding electrode is introduced as an intermediary element positioned between adjacent pixel electrodes. This shielding electrode acts as a mediator that blocks or reduces the capacitive coupling between neighboring pixels, thereby minimizing unwanted voltage transfer while maintaining a compact pixel structure.
Solution Approach 2:
The shielding electrode is positioned in a different spatial dimension (vertical stacking) relative to the pixel electrodes. By utilizing the vertical dimension rather than increasing horizontal spacing, the patent reduces voltage coupling without significantly increasing the overall pixel area or device complexity.
2Area of moving object
If pixel electrodes are arranged to minimize area, then area efficiency is improved, but edge discoloration at pixel boundaries increases
Solution Approach 1:
The shielding electrode serves as a mediator that prevents direct capacitive interaction between adjacent pixel electrodes at their boundaries. This intermediary structure effectively suppresses edge discoloration phenomena while allowing pixel electrodes to maintain minimal area for high resolution displays.
3Adaptability or versatility
If voltage lines are extended to reach distant pixels, then connectivity is improved, but coupling between adjacent pixels increases
Solution Approach 1:
The voltage line structure is segmented by introducing shielding electrodes at intervals between adjacent pixels. This segmentation divides the continuous voltage line into electrically isolated sections, preventing voltage coupling between pixels while maintaining proper connectivity to each pixel electrode.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This arrangement effectively reduces voltage coupling and edge discoloration, enhancing display quality by minimizing unwanted light emission and improving the accuracy of color representation at pixel boundaries.
Implementation Method 1
a node connected to a gate electrode of one pixel and a node connected to a gate electrode of another pixel are adjacent to each other, such that a coupling phenomenon in which the voltage is applied to the gate electrode of one pixel by the voltage applied to the gate electrode of another pixel is relatively reduced or minimized
Implementation Method 2
a node connected to a pixel electrode of one pixel overlaps a node connected to a gate electrode of another pixel, such that a coupling phenomenon in which the voltage is applied to the pixel electrode of one pixel by the voltage applied to the pixel electrode of another pixel is relatively reduced or minimized
Data Source
AI summary
A display device includes: a first pixel and a second pixel, including: a first transistor comprising a first active region, a first drain electrode, and a first source electrode respectively on one side and another side of the first active region, and a first gate electrode overlapping the first active region, a first capacitor electrode connected to the first gate electrode and overlapping the first source electrode, and a light emitting element connected to the first transistor, wherein a first end of the first source electrode of the first pixel, and a second end of the first source electrode of the second pixel face each other, a third end of the first capacitor electrode of the first pixel, and a fourth end of the first capacitor electrode of the second pixel face each other, and the first end is between the third end and the fourth end.