Gate Line Extension for Charge Accumulation in Display Devices
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Solution Overview
Problem
As display devices increase in size, charges accumulated in the lines of the first gate conductive layer can lead to an increased electric field, affecting the semiconductor layer and causing defects such as dark spots and luminance deterioration, which reduce display quality and lifespan.
Innovation Solution
The display device incorporates a substrate with a display area and a non-display area, featuring emission pixel drivers and gate lines in a circuit layer. The gate lines include extension portions that extend into the non-display area, ensuring that both ends of the gate lines are spaced apart from the display area, thereby reducing the impact of accumulated charges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display device size is increased, then the display area is enlarged, but charges accumulate in the gate lines causing electric field increase and thin film transistor characteristic deterioration
Solution Approach 1:
The patent extracts the problematic gate lines from the display area and relocates them to the non-display area. By extending gate lines into the non-display area, the accumulation of charges that causes electric field increase and thin film transistor deterioration is eliminated, while the display area remains enlarged.
Solution Approach 2:
The non-display area serves as an intermediary region that accommodates the gate lines. This intermediary space allows gate lines to be positioned away from the display area, preventing charge accumulation effects from affecting thin film transistors in the display region while maintaining overall device functionality.
2Reliability
If the gate lines are extended into the non-display area, then charge accumulation effects are reduced, but the device structure becomes more complex
Solution Approach 1:
The non-display area is utilized for multiple purposes: it serves as both the boundary region of the display device and as the location for accommodating gate lines. This multi-functional use of the non-display area extends gate lines away from the display region without requiring additional structural elements, thereby reducing complexity.
Data Source
AI summary
A display device comprises a substrate including a display area including light emission areas, and a non-display area disposed adjacent to the display area, a circuit layer disposed on the substrate, and an element layer disposed on the circuit layer, and including light emitting elements disposed in the light emission areas. The circuit layer includes emission pixel drivers electrically connected to the light emitting elements, and gate lines electrically connected to the emission pixel drivers. The gate lines are disposed in a first gate conductive layer on a first gate insulating layer overlapping a semiconductor layer. The gate lines include first gate lines, each of which includes an extension portion extended to the non-display area and disposed in the non-display area. An extension length of the extension portion is equal to or greater than a width of the emission pixel driver in the first direction.