Transparent Electrode Pixel Layout for Crosstalk Shielding
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Solution Overview
Problem
As display device pixels are miniaturized, they become more susceptible to capacitive coupling with signal lines, leading to crosstalk issues when attempting to drive them at high speeds, which affects the potential of the pixel electrode and reduces performance.
Innovation Solution
The configuration includes a common electrode that intersects and shields signal lines, along with a storage capacitor formed by the pixel electrode, insulating layers, and common electrodes, to reduce capacitive coupling and crosstalk, ensuring efficient high-speed operation of miniaturized pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the pixel size is reduced to increase display resolution, then the display density is improved, but the capacitive coupling with signal lines increases causing crosstalk
Solution Approach 1:
A common electrode is introduced as an intermediary element between the pixel electrode and the signal lines. This common electrode serves as a shield that intercepts and redistributes the electric field lines, reducing the direct capacitive coupling between the pixel electrode and adjacent signal lines. The common electrode is connected to a fixed potential (typically ground or reference potential), creating an equipotential barrier that minimizes interference.
Solution Approach 2:
The patent converts the harmful capacitive coupling effect into a beneficial shielding effect. By intentionally placing a conductive common electrode in the vicinity of the signal lines, the parasitic capacitance is transformed into a controlled shielding mechanism. The common electrode's capacitance to the signal lines is used to create an equipotential region that protects the pixel electrode from interference, turning the originally harmful electromagnetic coupling into a protective shield.
2Area of moving object
If the transistor size is reduced to accommodate smaller pixels, then the pixel density is improved, but the driving capability for high-speed operation deteriorates
Solution Approach 1:
The patent employs oxide semiconductor material (such as IGZO - indium gallium zinc oxide) for the transistor channel, which fundamentally changes the material parameters. Oxide semiconductors provide high carrier mobility (comparable to or exceeding amorphous silicon) while enabling lower operating voltages. This material parameter change allows transistors to achieve sufficient driving capability even at reduced sizes, as the high mobility compensates for the smaller channel dimensions.
Solution Approach 2:
The transistor structure uses a composite approach combining oxide semiconductor layers with other functional materials. The oxide semiconductor channel layer is combined with specific gate insulator materials and electrode materials to create a composite transistor structure that optimizes both size and performance. This composite material approach enables the transistor to maintain high-speed driving capability despite size reduction.
3Illumination intensity
If the opening ratio is increased to improve light transmission, then the display brightness is improved, but the area available for wiring and transistor arrangements is reduced
Solution Approach 1:
The patent utilizes vertical layering (z-dimension) to resolve the planar conflict between opening ratio and wiring space. By stacking multiple transparent conductive layers and insulating layers vertically, the design accommodates necessary wiring and transistor structures in the vertical dimension while maintaining a large horizontal opening ratio. The common electrode, pixel electrode, and various insulating layers are arranged in multiple tiers, allowing light to pass through the large opening area while electrical connections are established through vertical vias and stacked structures.
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 configuration effectively reduces the impact of capacitive coupling, minimizing crosstalk and enhancing the performance of scaled-down pixels by increasing storage capacity and maintaining a high opening ratio.
Implementation Method 1
pixels are miniaturized, they become more susceptible to capacitive coupling with signal lines
Implementation Method 2
a common electrode that intersects and shields signal lines, along with a storage capacitor formed by the pixel electrode, insulating layers, and common electrodes, to reduce capacitive coupling and crosstalk
Data Source
AI summary
A display device includes a first transistor provided with an oxide semiconductor layer, a first gate wiring facing the oxide semiconductor layer and a first gate insulating layer between the oxide semiconductor layer and the first gate wiring, a first transparent conductive layer provided on at least a first insulating layer on the first transistor, the first transparent conductive layer having an area overlapping the gate wiring and being in contact with the oxide semiconductor layer in a first contact area not overlapping the gate wiring, a second transparent conductive layer provided above at least a second insulating layer on the first transparent conductive layer and being in contact with the first transparent conductive layer at a second contact area overlapping the gate wiring, and a third transparent conductive layer provided between the second transparent conductive layer and the second insulating layer.