Display Pixel Circuit Layout With Shielding for Horizontal Crosstalk
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Solution Overview
Problem
Display devices face challenges in reducing coupling capacitance between pixel circuits, leading to horizontal crosstalk, which affects image quality.
Innovation Solution
The implementation of a display device design that includes a double capacitor structure between the gate electrode and source electrode of transistors, utilizing specific metal layers and active layers to minimize coupling capacitance and prevent horizontal crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pixel circuits are positioned close together to increase pixel density, then productivity is improved, but coupling capacitance increases causing horizontal crosstalk
Solution Approach 1:
The patent introduces a shielding electrode as an intermediary element positioned between adjacent pixel circuits. This shielding electrode acts as a mediator that blocks the capacitive coupling between neighboring pixel circuits, thereby preventing horizontal crosstalk while allowing the pixel circuits to remain in close proximity for high pixel density.
Solution Approach 2:
The patent extracts the harmful coupling capacitance by separating the pixel circuits with a shielding electrode structure. The shielding electrode is electrically connected to a reference potential, effectively removing the parasitic capacitance path between adjacent pixel circuits and eliminating the source of horizontal crosstalk.
2Object-affected harmful factors
If pixel circuits are spaced apart to reduce coupling capacitance, then horizontal crosstalk is reduced, but pixel density decreases
Solution Approach 1:
The patent solves the spatial constraint by introducing a vertical dimension - the shielding electrode extends in the thickness direction of the display device. This allows the pixel circuits to maintain close horizontal spacing for high density while the vertical shielding structure blocks capacitive coupling without requiring increased horizontal separation.
Solution Approach 2:
The shielding electrode is nested within the overall pixel structure, positioned between and around the pixel circuits. This nested configuration allows the shielding function to be integrated into the pixel array without adding significant external dimensions, maintaining high pixel density while providing effective crosstalk suppression.
3Object-affected harmful factors
If shielding structures are added between pixel circuits, then horizontal crosstalk is reduced, but device complexity increases
Solution Approach 1:
The shielding electrode serves multiple functions simultaneously: it acts as a shield against capacitive coupling, provides a reference potential plane, and can be integrated with existing pixel circuit layers. This multi-functionality reduces the need for separate dedicated shielding structures, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent merges the shielding electrode with existing metal layers and pixel circuit structures. By combining the shielding function with already-present conductive elements in the pixel circuit, the design avoids adding completely separate shielding components, thus minimizing the increase in structural complexity.
Data Source
AI summary
A display device includes a pixel circuit of a first pixel formed of: a first meta layer, an active layer on the first metal layer, and a second metal layer on the active layer, a first electrode formed of: a third metal layer on the second metal layer and overlapping the pixel circuit of the first pixel, a pixel circuit of a second pixel formed of: the first metal layer, the active layer, and the second metal layer and spaced apart from the pixel circuit of the first pixel in a first direction, a second electrode formed of the third metal layer and overlapping the pixel circuit of the second pixel, an alignment line formed of the third metal layer and extending in the first direction, and light emitting elements aligned between the alignment line and the first electrode and between the alignment line and the second electrode.