Multi-Layer Display Voltage Layout for Luminance Uniformity
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Solution Overview
Problem
Conventional display devices face challenges in maintaining uniform voltage distribution and reducing voltage drops across pixel elements, leading to potential image quality defects such as luminance deviations and crosstalk due to signal coupling.
Innovation Solution
The proposed display device incorporates a specific configuration of conductive layers and transistors, including a third and fourth voltage line arrangement that alternates in direction, a transverse initialization voltage line, and a common electrode connected to the fourth voltage line, which helps in reducing voltage drops and improving image quality by ensuring uniform voltage distribution across pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional voltage line configuration is used, then device complexity is reduced, but voltage distribution uniformity deteriorates leading to luminance deviations
Solution Approach 1:
The voltage distribution problem is segmented by dividing the conductive layer into multiple sub-layers (first conductive layer, second conductive layer, third conductive layer) with different functions. Each layer handles specific voltage transmission tasks, allowing independent optimization of voltage distribution without requiring complete redesign of the entire conductive system.
Solution Approach 2:
The patent transitions from a planar voltage line configuration to a multi-layer three-dimensional configuration. By stacking conductive layers vertically and using transverse voltage lines that cross over pixel rows, the system achieves uniform voltage distribution across the display panel without increasing the horizontal footprint or complicating the overall device structure.
2Reliability
If simple conductive layer arrangement is used, then manufacturing is easier, but voltage drops increase causing image quality defects
Solution Approach 1:
The patent creates equipotential regions by positioning transverse initialization voltage lines and common voltage lines to ensure uniform potential distribution across pixel rows. The third conductive layer is configured to maintain consistent voltage levels at critical points (such as capacitor electrodes and light-emitting elements) throughout the display panel, eliminating potential differences that would cause luminance variations.
Solution Approach 2:
The patent introduces intermediate conductive structures (such as the third conductive layer with transverse voltage lines) that act as mediators between the data lines and the pixel elements. These intermediate structures distribute voltage uniformly across multiple pixels simultaneously, reducing voltage drops without requiring complex point-to-point connections that would be difficult to manufacture.
3Reliability
If voltage lines are arranged to reduce voltage drops, then image quality improves, but device complexity increases
Solution Approach 1:
The patent merges multiple voltage transmission functions into a unified multi-layer conductive structure. The first, second, and third conductive layers work together as an integrated system, with each layer contributing to overall voltage distribution. This merged structure achieves uniform luminance across the display without requiring separate complex voltage control systems for different regions.
Solution Approach 2:
The transverse voltage lines in the third conductive layer serve multiple functions simultaneously: they provide initialization voltages to capacitor electrodes, supply common voltages to light-emitting elements, and maintain equipotential conditions across pixel rows. This multi-functionality reduces the need for separate dedicated voltage lines, thereby improving luminance uniformity without proportionally increasing device complexity.
Data Source
AI summary
A display device including: a substrate; an active layer disposed on the substrate and including active patterns; a first conductive layer disposed on the active layer; a second conductive layer disposed on the first conductive layer and including a data line; a third conductive layer disposed on the second conductive layer; and a light-emitting element disposed on the third conductive layer, wherein the first conductive layer includes a scan line, a first voltage line, and a second voltage line, the third conductive layer includes a third voltage line connected to the first voltage line and a fourth voltage line connected to the second voltage line, the first voltage line and the second voltage line extend in a first direction, the third voltage line and the fourth voltage line extend in a second direction, and the third voltage line and the fourth voltage line are alternately arranged in the first direction.