Display Device Printed Layers Sequential Curing Light Leakage
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Solution Overview
Problem
Current display devices face challenges in effectively blocking unnecessary light and maintaining reliability due to issues with light leakage and ink layer curing processes, which can lead to reliability degradation such as bubble formation and peeling of printed layers.
Innovation Solution
A display device with a window featuring a stack of printed layers, each with different isocyanate-blocking groups and dissociation temperatures, and a manufacturing method involving sequential curing of ink layers with specific temperatures and light wavelengths to prevent light leakage and enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple ink layers are printed and cured simultaneously at high temperature, then light blocking performance is improved, but reliability deteriorates due to bubble formation and peeling
Solution Approach 1:
The curing process is segmented into multiple stages with different temperature ranges. Each ink layer is cured at its optimal temperature range sequentially rather than simultaneously, preventing bubble formation and peeling while ensuring complete curing of all layers for effective light blocking.
Solution Approach 2:
The first ink layer is cured at a lower temperature range (60-80°C) before applying and curing subsequent ink layers at higher temperatures. This preliminary curing action prevents damage to underlying layers and avoids bubble formation, ensuring reliable adhesion while maintaining light blocking performance.
2Productivity
If a single high curing temperature is applied to all ink layers, then curing speed is improved, but manufacturing precision deteriorates due to uneven curing and defects
Solution Approach 1:
Different temperature ranges are applied to different ink layers based on their specific curing requirements. The first ink layer is cured at 60-80°C while subsequent layers are cured at higher temperatures, ensuring each layer achieves optimal curing uniformity and adhesion without defects.
Solution Approach 2:
The curing temperature parameter is changed and optimized for each ink layer. By adjusting the temperature range according to the specific layer being cured, the process achieves both high curing speed and uniform curing quality without manufacturing defects.
3Reliability
If ink layers are cured at low temperature, then reliability is improved by preventing bubbles and peeling, but light blocking performance deteriorates due to incomplete curing
Solution Approach 1:
The curing process is segmented into multiple temperature stages. The first layer is cured at lower temperature (60-80°C) to ensure reliability, while subsequent layers are cured at progressively higher temperatures to achieve complete curing and effective light blocking, resolving the contradiction between reliability and light blocking performance.
Solution Approach 2:
The first ink layer is preliminarily cured at low temperature to establish reliable adhesion and prevent bubbles, then subsequent layers are cured at higher temperatures to ensure complete curing. This sequential approach maintains both reliability and light blocking effectiveness.
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 effectively blocks unnecessary light and enhances the reliability of the display device by ensuring proper curing of ink layers, minimizing light leakage and preventing reliability degradation like bubble formation and peeling.
Implementation Method 1
curing the first ink layer may include applying a first light having a first wavelength to the first ink layer
Implementation Method 2
curing the second ink layer may include applying a second light having a second wavelength to the second ink layer, the second wavelength being different from the first wavelength. The first light may be ultraviolet (UV) light and the second light may be infrared (IR) light
Data Source
AI summary
A display device, including a display panel including a display area and a non-display area, the non-display area surrounding the display area; a window facing the display panel and including a light-transmitting area and a light-blocking area, the light-transmitting area corresponding to the display area, and the light-blocking area corresponding to the non-display area; and a plurality of printed layers on the window in the light-blocking area, each printed layer including an isocyanate-blocking group having a different dissociation temperature from isocyanate-blocking groups included in other printed layers.