Display Device Pseudo-Reflection Pattern for Improved Light Efficiency
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Solution Overview
Problem
Display devices face challenges in improving luminous efficiency, particularly in areas with component holes where protective layers may obstruct light emission.
Innovation Solution
A display device design incorporating a pseudo-reflection pattern formed of low-temperature curable photosensitive resin composition, which overlaps the pixel defining film and is used to form a connection electrode without a mask, enhancing light efficiency by allowing light to pass through component holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective layer is formed in the component hole to protect the component, then the component is protected from damage, but the protective layer obstructs light emission and reduces luminous efficiency
Solution Approach 1:
The protective layer in the component hole, which initially obstructs light emission, is converted into a beneficial pseudo-reflection pattern that reflects light back toward the light emitting element layer. This transforms the harmful light blocking effect into a useful light reflection effect that enhances luminous efficiency while maintaining component protection.
2Manufacturing precision
If a mask is used to form the connection electrode with precise width control, then the electrode width precision is improved, but the manufacturing process complexity and steps increase
Solution Approach 1:
The mask step is extracted and removed from the manufacturing process. Instead of using a mask to define the connection electrode width, the pseudo-reflection pattern itself serves as the forming template, allowing the connection electrode to be formed directly with precise width control through the pattern's geometry without requiring additional mask materials or removal steps.
3Device complexity
If the connection electrode has the same width as the driving electrode, then the design is simplified, but the light efficiency is reduced due to excessive electrode coverage over the pixel defining film
Solution Approach 1:
The connection electrode is designed with a greater width than the driving electrode specifically in the region overlapping the pixel defining film, while maintaining appropriate width elsewhere. This localized width increase allows the electrode to connect properly through the touch insulating layer without excessively blocking light in the pixel area, optimizing both electrical connection and optical performance.
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 design improves light efficiency by allowing light to pass through component holes without obstructing emission, thereby enhancing the overall luminance of the display device.
Implementation Method 1
a pseudo-reflection pattern overlapping the pixel defining film and formed on the thin film encapsulation film
Implementation Method 2
formed of low-temperature curable photosensitive resin composition
Data Source
AI summary
A display device, includes: a light emitting element layer including a sub-pixel and a pixel defining film defining the sub-pixel; a thin film encapsulation layer on the light emitting element layer; a pseudo-reflection pattern overlapping the pixel defining film and formed on the thin film encapsulation film; a connection electrode on the pseudo-reflection pattern; a second touch insulating layer on the connection electrode; and a driving electrode and a sensing electrode on the second touch insulating layer, wherein a width of the connection electrode is greater than a width of the driving electrode.