Shielding Electrode for Crosstalk Reduction in Display Pixels
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Solution Overview
Problem
In light emitting display devices, switching transistors adjacent to data lines are influenced by voltage changes, leading to potential issues such as horizontal crosstalk during image display, particularly when displaying transitions between black and gray images.
Innovation Solution
A display device design that includes a shielding electrode overlapping part of the first transistor in the thickness direction of the substrate, positioned between the data line and the transistor to reduce the influence of data voltage transitions, thereby minimizing parasitic capacitance and preventing horizontal crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a switching transistor is disposed adjacent to a data line to enable compact pixel design, then the pixel area is reduced, but the transistor is influenced by voltage changes of the data line causing horizontal crosstalk
Solution Approach 1:
A shielding electrode is introduced as an intermediary element between the data line and the switching transistor. This shielding electrode overlaps with the transistor in the thickness direction but does not overlap with the data line, creating an electrostatic shield that reduces parasitic capacitance between the data line and transistor. This mediator structure allows the transistor to be positioned adjacent to the data line for compact design while blocking the harmful voltage change influence that causes horizontal crosstalk.
2Object-affected harmful factors
If the shielding electrode overlaps the data line to maximize shielding effect, then the influence of voltage changes is reduced, but parasitic capacitance increases causing horizontal crosstalk
Solution Approach 1:
The shielding electrode is designed with spatially differentiated overlapping characteristics: it overlaps with the transistor in the thickness direction to provide shielding protection, but deliberately does not overlap with the data line. This local quality differentiation ensures that the shielding function is activated where needed (at the transistor location) while avoiding the creation of harmful parasitic capacitance with the data line, thus resolving the contradiction between shielding effectiveness and parasitic capacitance reduction.
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
The shielding electrode effectively reduces the impact of data voltage transitions on the transistors, minimizing horizontal crosstalk and improving image display quality by reducing parasitic capacitance between the data lines and the transistors.
Implementation Method 1
minimizing parasitic capacitance and preventing horizontal crosstalk
Data Source
AI summary
A display device includes a substrate, data lines arranged on the substrate, the data lines to which data voltages are applied, scan lines arranged on the substrate, the scan lines to which scan signals are applied, and a pixel connected to one of the data lines and at least one of the scan lines. The pixel includes a light emitting element, a driving transistor which supplies a driving current flowing between a first electrode and a second electrode to the light emitting element in accordance with the data voltage of the data line applied to a gate electrode, a first transistor between the gate electrode and second electrode of the driving transistor, a shielding electrode overlapping at least a part of the first transistor in a thickness direction of the substrate. The shielding electrode does not overlap the data lines in the thickness direction of the substrate.