Display Device Shield Electrode Reduces Coupling Capacitance
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Solution Overview
Problem
Display devices experience a black blurring phenomenon and noise at black levels due to coupling capacitance between the gate line and the contact electrode, which existing technologies have not effectively addressed.
Innovation Solution
The implementation of a display device design that reduces coupling capacitance by incorporating a second electrode receiving a low potential voltage, which shields the capacitance between the gate line and the contact electrode, and includes a specific configuration of voltage lines, electrodes, and light emitting elements to eliminate the black blurring phenomenon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a gate line and contact electrode are positioned close to each other for compact pixel design, then device integration is improved, but coupling capacitance increases causing black blurring and noise
Solution Approach 1:
A shield electrode is introduced as an intermediary element positioned between the gate line and the contact electrode. This shield electrode acts as a mediator that intercepts and redirects electric field lines, preventing direct coupling between the gate line and contact electrode. The shield electrode is connected to a fixed potential (typically ground or reference potential) to effectively terminate the electric field, thereby reducing the unwanted capacitive coupling while maintaining the compact pixel layout.
Solution Approach 2:
The harmful coupling capacitance is extracted and isolated by introducing a separate shield electrode structure. Instead of directly reducing the distance between gate line and contact electrode, the solution extracts the problematic electric field interaction by placing a dedicated shielding element that captures and contains the stray electric fields, separating the functional requirements of compact layout from the harmful capacitive coupling.
2Productivity
If the distance between gate line and contact electrode is reduced to increase pixel density, then productivity is improved, but display quality deteriorates due to black blurring
Solution Approach 1:
The shield electrode serves as a mediating structure that enables high pixel density while maintaining display quality. By positioning the shield electrode between the gate line and contact electrode, the design achieves compact pixel spacing without suffering from the black blurring effect, as the shield electrode actively manages the electric field distribution to prevent capacitive coupling artifacts.
3Device complexity
If existing technologies are used without additional shielding structures, then device complexity is reduced, but black blurring phenomenon persists
Solution Approach 1:
A shield electrode is introduced as an intermediary element positioned between the gate line and the contact electrode. This shield electrode acts as a mediator that intercepts and redirects electric field lines, preventing direct coupling between the gate line and contact electrode. The shield electrode is connected to a fixed potential (typically ground or reference potential) to effectively terminate the electric field, thereby reducing the unwanted capacitive coupling while maintaining the compact pixel layout.
Solution Approach 2:
The additional shield electrode structure, while increasing device complexity, converts the harmful coupling capacitance into a beneficial shielding effect. The extra structural element creates a controlled electric field environment that actively prevents the black blurring phenomenon, transforming what would be a parasitic capacitance into a useful shielding mechanism.
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 proposed solution effectively reduces coupling capacitance, eliminating the black blurring phenomenon and noise at black levels, thereby enhancing the display quality of the device.
Implementation Method 1
incorporating a second electrode receiving a low potential voltage, which shields the capacitance between the gate line and the contact electrode
Data Source
AI summary
A display device includes a substrate including a plurality of pixel areas including first, second, and third pixels, a first voltage line extending in a first direction on the substrate, a second voltage line extending in a second direction crossing the first direction on the first voltage line and connected to the first voltage line, a first electrode of each of the first, second, and third pixels being on the second voltage line to receive a driving current, a second electrode of each of the first, second, and third pixels and a third electrode of each of the first, second, and third pixels, the second and third electrodes being parallel to the first electrode and connected to the second voltage line, a first contact electrode of each of the first, second, and third pixels, the first contact electrode being on the first electrode and connected to the first electrode.