Touch Electrode Sealing Film Taper for Reliable Display Wiring
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Solution Overview
Problem
Existing display devices face challenges in preventing disconnection of touch panel wiring due to the increased cost and complexity of manufacturing masks with finely set transmittance variations, which are necessary to form gradual taper shapes in insulating films.
Innovation Solution
A method is employed to reduce the taper angle of the sealing film's end portion without increasing costs, using a gray-tone mask to form taper shapes in the first and second inorganic insulating films, with specific taper angles in wiring and non-wiring areas to stabilize the thickness and prevent disconnection of lead wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If portions having different transmittances are finely set in a halftone mask to form gradual taper shapes, then the taper shape can be theoretically caused to be gradual, but the mask manufacturing process increases and the cost increases
Solution Approach 1:
The patent divides the sealing film into multiple inorganic insulating films (first, second, and third inorganic insulating films) with different thicknesses. Each film has a controlled end portion that forms a taper shape with a specific angle range (0-10 degrees). This segmentation approach allows precise control of the taper shape without requiring complex multi-transmittance masks, thereby reducing mask manufacturing complexity while maintaining manufacturing precision.
Solution Approach 2:
The patent controls the taper angle of the inorganic insulating film end portions within a specific parameter range (0-10 degrees) to achieve the desired gradual taper effect. By adjusting this angular parameter and the thickness parameters of different inorganic insulating films, the patent achieves precise taper shaping without needing finely set transmittance variations in the mask, thus resolving the contradiction between precision and complexity.
2Reliability
If the taper angle of the sealing film end portion is reduced to prevent disconnection of wiring, then wiring disconnection is prevented, but the frame area increases
Solution Approach 1:
The patent uses multiple inorganic insulating films with different thicknesses (first, second, and third films) where each film's end portion contributes to the overall taper shape. This segmentation allows the wiring to be supported by a distributed taper structure rather than requiring a large single taper, thus maintaining wiring reliability while minimizing the frame area occupation.
Solution Approach 2:
The patent applies different thickness configurations of inorganic insulating films at different locations. The first inorganic insulating film has a greater thickness than the second inorganic insulating film, creating localized thickness variations that provide adequate support for wiring in critical areas while keeping the overall frame area compact.
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 approach effectively prevents disconnection of lead wires, stabilizes resistance values, and enhances the sensitivity and time constant of touch sensors, while narrowing the frame area and reducing manufacturing complexity.
Implementation Method 1
forming a resist located on the sealing film and having a taper shape by using a gray-tone mask, forming taper shapes in an end portion of the first inorganic insulating film and an end portion of the second inorganic insulating film by etching
Data Source
AI summary
The method for manufacturing a display device includes forming a light emitting element and a terminal on a substrate, forming a sealing film including a first inorganic insulating film and a second inorganic insulating film to cover the light emitting element and the terminal, forming a resist having a taper shape in which a thickness of an end portion on the sealing film becomes thinner as it goes to the terminal side by using a gray-tone mask, forming a taper shape in which thicknesses in end portions of the first inorganic insulating film and the second inorganic insulating film becomes thinner as it goes to the terminal side by etching, forming a touch electrode above the sealing film and forming wiring connected to the terminal via the end portions together with connecting to the touch electrode for detecting a touched position.