Light Blocking Part for Tiled Display Seam Reduction
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Solution Overview
Problem
Large-sized display devices face increased defect rates and decreased productivity due to the number of pixels, leading to seams between tiled display devices that disrupt the image continuity and immersion.
Innovation Solution
A display device design with a light blocking part that minimizes heat-affected areas during cutting, using organic black and blue pigments with specific ratios and concentrations, and a wavelength conversion layer to enhance transmittance and reduce the visibility of seams between tiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large-sized display device is manufactured with increased number of pixels, then the display area is improved, but the defect rate increases and productivity decreases
Solution Approach 1:
The display device is divided into multiple small-sized display panels that are tiled together to form a large-sized display. Each panel contains a reduced number of pixels, maintaining manufacturing quality while achieving a large overall display area through the arrangement of multiple panels.
2Area of stationary object
If multiple display devices are connected to form a tiled display, then the display area is improved, but seams appear between devices reducing image continuity
Solution Approach 1:
The light blocking part is designed with specific local optical properties - it blocks visible light to prevent seam visibility while transmitting infrared light to minimize heat-affected areas during cutting. This localized quality differentiation allows the seam area to serve dual purposes: maintaining image continuity visually while enabling precise manufacturing.
3Stability of the object's composition
If a light blocking part with high visible light blocking capability is used, then seam visibility is reduced, but heat-affected area during cutting increases
Solution Approach 1:
The light blocking part's optical parameters are optimized to achieve selective wavelength transmission - high blocking capability for visible light (400-700nm) to hide seams, while high transmission for infrared light (700nm+) to allow laser cutting with minimal heat-affected area. This parameter differentiation resolves the contradiction between seam visibility and cutting quality.
4Stability of the object's composition
If the non-display area is reduced to minimize seams, then image immersion is improved, but the tolerance of cutting process increases
Solution Approach 1:
The light blocking part acts as an intermediary element in the non-display area that enables precise cutting by transmitting infrared laser light while blocking visible light. This intermediary property allows the cutting process to be performed with high precision on a minimized non-display area without increasing tolerance requirements.
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 reduces the tolerance of the cutting process, minimizes non-display areas, and improves image immersion by making seams less noticeable, thereby enhancing the overall display quality and user experience.
Implementation Method 1
a wavelength conversion layer disposed on the light-emitting element layer that converts a peak wavelength of a light from at least a part of the light-emitting elements
Implementation Method 2
A transmittance of the first light blocking part with respect to a light having a wavelength of about 1000 nm or more is about 80% or more
Data Source
AI summary
A display device includes a substrate including a display area including emission areas and a light blocking area; and a non-display area adjacent to the display area; a thin-film transistor layer disposed on the substrate and including thin-film transistors; a light-emitting element layer disposed on the thin-film transistor layer and including light-emitting elements; a wavelength conversion layer disposed on the light-emitting element layer that converts a peak wavelength of a light from at least a part of the of light-emitting elements; and a color filter layer disposed on the wavelength conversion layer, and including color filters corresponding to the emission areas and a first light blocking part corresponding to the light blocking area and the non-display area. A transmittance of the first light blocking part with respect to a light having a wavelength of about 1000 nm or more is about 80% or more.