Display Device Gate Electrode Overlap Constant Voltage Line
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in optimizing manufacturing processes and improving image quality, particularly due to the need for complex mask processes and metal layers that increase costs and complexity.
Innovation Solution
The display device incorporates a design where the gate electrode of the driving transistor overlaps at least one of the constant voltage lines, eliminating the need for a separate metal layer and mask process, thereby simplifying the manufacturing process and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a separate metal layer and mask process are used in the display device manufacturing, then the manufacturing precision and reliability are improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the metal layer function with the constant voltage line by making the constant voltage line itself serve as the electrode for the compensation capacitor, eliminating the need for a separate metal layer. This integration reduces the number of manufacturing steps and device layers while maintaining the required electrical functionality for threshold voltage compensation.
Solution Approach 2:
The constant voltage line is designed to serve multiple functions: it provides the constant voltage signal to the subpixel circuits and simultaneously acts as the electrode for the compensation capacitor. This multi-functionality eliminates the need for dedicated metal layers solely for capacitor electrodes, reducing overall device complexity.
2Reliability
If a separate metal layer is added to the display device structure, then the capacitor capacity is increased, but the manufacturing process complexity and cost increase
Solution Approach 1:
The patent combines the constant voltage line with the capacitor electrode function, so the same conductive structure serves both as a voltage reference line and as the electrode that stores charge for threshold voltage compensation. This eliminates the need for additional metal deposition steps while achieving sufficient capacitor capacity.
Solution Approach 2:
The patent increases capacitor capacity by optimizing the overlap area between the gate electrode and the constant voltage line in the planar dimension, rather than adding vertical metal layers. By maximizing the overlapping region in the existing layer structure, sufficient capacitance is achieved without increasing vertical device complexity.
3Manufacturing precision
If the gate electrode overlaps with constant voltage lines, then the capacitor capacity is increased and threshold voltage compensation is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent integrates the threshold voltage compensation function directly into the existing constant voltage line structure. The gate electrode overlap with the constant voltage line creates the compensation capacitor using structures that already exist in the manufacturing process, avoiding the need for separate compensation circuitry or additional processing steps.
Data Source
AI summary
A display device includes a plurality of subpixels, a plurality of subpixel circuits disposed in the plurality of subpixels and comprising a driving transistor and a plurality of constant voltage lines connected to the plurality of subpixel circuits, wherein a gate electrode of the driving transistor overlaps at least one of the plurality of constant voltage lines.