Transparent Branch Line Layout for Repairable High-Aperture Displays
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Solution Overview
Problem
Existing display devices face challenges in achieving a high aperture ratio while maintaining pixel repair functionality without reducing the aperture ratio and are susceptible to image sticking due to the placement of color filters and branch lines.
Innovation Solution
The display device incorporates a transparent branch line connected to a reference voltage line, with a repair pattern and color filter configuration that allows for pixel repair without reducing the aperture ratio, using transparent materials for the branch line and strategically placing color filters to protect against laser damage during repair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a color filter is disposed in the non-emission area to protect against laser damage during repair, then the reliability of pixel repair is improved, but the aperture ratio is reduced
Solution Approach 1:
The color filter layer is selectively disposed only in the non-emission area where the repair pattern is located, rather than covering the entire pixel area. This local placement provides laser protection exactly where needed during repair operations while leaving the emission area completely clear to maximize aperture ratio.
Solution Approach 2:
The solution moves the color filter from a traditional position covering the emission area to a new dimensional arrangement where it extends into the non-emission area. This spatial reconfiguration allows the same color filter layer to serve dual purposes: maintaining its protective function in the non-emission area while not compromising the emission area's aperture ratio.
2Device complexity
If a branch line is disposed in the emission area to connect the repair pattern with sub-pixels, then the device complexity is reduced, but the aperture ratio is reduced
Solution Approach 1:
The transparent branch line is specifically positioned in the non-emission area to connect the repair pattern with circuit devices, rather than extending through the emission area. This localized placement reduces the overall structure complexity while preserving the emission area's aperture ratio by keeping the branch line out of the light-emitting region.
3Area of moving object
If the branch line is made of transparent material and disposed in the emission area, then the aperture ratio is increased, but the reliability of pixel repair is reduced due to laser damage
Solution Approach 1:
The color filter layer is segmented into different functional zones: it covers the repair pattern in the non-emission area to provide laser protection during repair operations, while being absent from the emission area to maintain high aperture ratio. This segmentation allows the same layer to serve protective and optical functions in different spatial regions.
Solution Approach 2:
The transparent branch line acts as an intermediary element that connects the repair pattern to circuit devices through the non-emission area. Its transparency allows it to fulfill the electrical connection function while being invisible in the emission area, thus maintaining aperture ratio. The color filter layer then serves as a secondary intermediary that protects this transparent branch line from laser damage during repair without affecting the emission area.
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 solution maintains a high aperture ratio and enhances the lifetime of the display by allowing effective pixel repair without damaging the light-emitting devices, thus improving the overall performance and longevity of the display.
Implementation Method 1
a color filter layer extending to the non-emission area to cover at least one area of the repair pattern
Data Source
AI summary
Embodiments relate to a display device including a substrate which includes an emission area and a non-emission area of a sub-pixel and on which a plurality of sub-pixels are disposed, a gate line disposed in the non-emission area and extending in one direction, a signal line disposed in the non-emission area and intersecting the gate line, a repair pattern disposed in the non-emission area and connected to the signal line, and at least one branch line for connecting the repair pattern with circuit devices of the plurality of sub-pixels.