Display device, method for manufacturing display device, and electronic apparatus with interlayer insulation film
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing organic electroluminescence (EL) display devices face challenges in setting the positional relationship between the organic layer and the reflection film with high precision, leading to variations in color and reduced luminous efficacy, especially when using a resonator structure for enhancing light of a particular wavelength.
Innovation Solution
A display device structure where the first electrode is formed on an interlayer insulation film with a reflection film below it, and the reflection film's light reflecting surface is flush with the boundary plane of different insulation materials in contact, allowing precise control of optical path length and reducing positional variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a resonator structure is used to enhance light of a particular wavelength, then luminous efficacy and color reproducibility are improved, but the positional relationship between the organic layer and the reflection film becomes difficult to control with high precision
Solution Approach 1:
The interlayer insulation film is formed beforehand with a predetermined thickness to establish a fixed optical path length between the organic EL layer and the reflection film. This preliminary structure ensures that the resonator effect can be achieved without requiring high-precision alignment during subsequent manufacturing steps, as the insulation film pre-defines the critical dimensional relationship.
Solution Approach 2:
The interlayer insulation film acts as an intermediary element between the organic EL layer and the reflection film. It serves dual functions: providing electrical insulation and establishing the precise optical path length required for the resonator effect. This intermediary structure eliminates the need for direct high-precision positioning between the organic layer and reflection film.
2Measurement precision
If the optical path length of the resonator structure is set with high precision, then light enhancement at a particular wavelength is improved, but manufacturing complexity increases
Solution Approach 1:
The interlayer insulation film is formed in advance with a predetermined thickness that directly determines the optical path length. This preliminary formation eliminates the need for complex post-adjustment mechanisms or precision alignment steps, thereby achieving high optical path length precision without increasing manufacturing complexity.
Solution Approach 2:
The optical path length is controlled by adjusting the thickness parameter of the interlayer insulation film, which can be precisely controlled during the film formation process. This parameter-based control is simpler than geometric or positional adjustments, reducing manufacturing complexity while maintaining precision.
3Stability of the object's composition
If variations in positional relationship between the organic layer and reflection film are reduced, then color variations are minimized, but manufacturing process complexity increases
Solution Approach 1:
The interlayer insulation film serves as a mediator that fixedly positions the organic EL layer relative to the reflection film. By forming this insulation film with a predetermined thickness, the manufacturing process achieves consistent color output without requiring complex alignment procedures or additional positioning structures.
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 structure enhances the precision of the positional relationship between the organic layer and the reflection film, improving luminous efficacy and color reproducibility by minimizing variations in color and maintaining high reflectance.
Implementation Method 1
there is known a technology for achieving improvement in luminous efficacy and color reproducibility by employing a resonator structure for enhancing the light having a particular wavelength by a resonance effect
Implementation Method 2
a reflection film is formed below the first electrode, the reflection film including a light reflecting surface
Data Source
AI summary
Provided is a display device in which more than one pixel is arranged in a two-dimensional matrix on a circuit board, the pixel including a light emission unit including a first electrode, an organic layer, and a second electrode that are stacked, in which the first electrode is disposed for each light emission unit, and a partition is formed between the first electrode and an adjacent first electrode, the organic layer and the second electrode are stacked on an entire surface including the first electrode and the partition, the first electrode is formed on an interlayer insulation film, and a reflection film is formed below the first electrode, the reflection film including a light reflecting surface disposed to be flush with a boundary plane on which different insulation materials are in contact with each other in the interlayer insulation film.