Display Device Common Voltage Mesh Structure
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Solution Overview
Problem
Display devices face challenges in preventing voltage drops in common electrodes, which can degrade display quality and efficiency.
Innovation Solution
The implementation of a display device design that includes a common electrode connected to initialization voltage lines and a common voltage line, with a mesh structure of first and second common voltage lines positioned between pixels, ensuring a consistent voltage transmission to the common electrode and minimizing resistance-induced voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a common electrode is used in display devices, then display quality is improved, but voltage drops occur due to resistance
Solution Approach 1:
The common voltage line is divided into multiple segments (first common voltage line and second common voltage line) that extend in different directions and cross the initialization voltage lines at different positions. This segmentation reduces the resistance in each segment, preventing voltage drops while maintaining display quality.
Solution Approach 2:
The common voltage line transitions from a single-direction layout to a multi-directional mesh structure that crosses the initialization voltage lines in perpendicular directions. This dimensional change creates multiple parallel conduction paths, reducing overall resistance and preventing voltage drops.
2Manufacturing precision
If initialization voltage lines are extended to cover all pixels, then voltage uniformity is improved, but resistance increases causing voltage drops
Solution Approach 1:
The initialization voltage lines are crossed by multiple segments of common voltage lines at different positions, creating a mesh structure that divides the long initialization voltage lines into smaller effective segments. This reduces the resistance along the initialization voltage lines while maintaining voltage uniformity across all pixels.
Solution Approach 2:
The common voltage lines act as intermediary conduction paths that provide alternative routes for voltage distribution. By crossing the initialization voltage lines, they create a mesh structure that mediates between the power source and pixels, reducing the burden on individual initialization voltage lines and preventing voltage drops.
3Reliability
If a mesh structure of common voltage lines is implemented, then voltage drop is prevented, but device complexity increases
Solution Approach 1:
The common voltage lines serve multiple functions: they provide common voltage to the common electrode, cross and connect with initialization voltage lines to form a mesh structure, and act as intermediate conduction paths. This multi-functionality reduces the need for separate structures, preventing voltage drops without proportionally increasing complexity.
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 design effectively prevents voltage drops in the common electrode, enhancing display quality and image clarity by maintaining consistent voltage across the display device.
Implementation Method 1
a common voltage line connected to the first initialization voltage line and the second initialization voltage line, wherein a same voltage is transmitted to the common electrode and the common voltage line
Data Source
AI summary
A display device includes a display element that includes a pixel electrode and a common electrode, a driving thin-film transistor, a first thin-film transistor connected to a gate electrode of the driving thin-film transistor and a first initialization voltage, a second thin-film transistor connected to the pixel electrode of the display element and a second initialization voltage line, and a common voltage line connected to the first initialization voltage line and the second initialization voltage line, wherein a voltage equal to a voltage transmitted to the common electrode is transmitted to the common voltage line.