Display Apparatus with Optimized Light-Emitting Layer Distances
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Solution Overview
Problem
Existing light-emitting devices face challenges in achieving high efficiency and reliability in emitting blue and green light while minimizing current density and material waste, and in displaying colors with high saturation.
Innovation Solution
A display apparatus comprising blue-light-emitting and green-light-emitting devices with specific structural configurations, including reflective films, electrodes, and intermediate layers, where the light-emitting layers are positioned to optimize emission spectra and reduce unnecessary material usage, and the use of intermediate layers to supply electrons and holes effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If light-emitting layers are positioned closer to reflective films to enhance emission efficiency, then blue and green light emission efficiency is improved, but current density increases and material waste occurs
Solution Approach 1:
The patent applies different distance configurations for blue-light-emitting and green-light-emitting layers relative to the reflective film. The blue-light-emitting layer is positioned at a first distance while the green-light-emitting layer is positioned at a second distance, optimizing each layer's emission efficiency locally without causing material waste in unnecessary regions.
Solution Approach 2:
The patent introduces a vertical distance dimension between light-emitting layers and the reflective film to control emission efficiency. By adjusting the first distance and second distance independently, the patent optimizes emission in the vertical dimension while preventing material waste in horizontal extensions.
2Loss of energy
If light-emitting layers are positioned closer to reflective films to enhance emission efficiency, then blue and green light emission efficiency is improved, but current density increases
Solution Approach 1:
The patent optimizes current density locally by positioning the blue-light-emitting layer at a first distance and the green-light-emitting layer at a second distance from the reflective film. This localized distance control allows each layer to operate at optimal current density levels without excessive energy consumption.
3Loss of energy
If intermediate layers are used to supply electrons and holes, then emission efficiency is improved, but device complexity increases
Solution Approach 1:
The patent introduces an intermediate layer positioned between the blue-light-emitting layer and the green-light-emitting layer. This intermediary layer supplies electrons to one light-emitting layer and holes to the other, improving emission efficiency by facilitating carrier transport without requiring complex external control systems.
4Illumination intensity
If multiple light-emitting layers are used to emit different colors, then color saturation is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The patent achieves high color saturation by using a blue-light-emitting layer and a green-light-emitting layer with different emission spectra. Each layer is positioned at a specific distance from the reflective film, and the intermediate layer is positioned between them, creating locally optimized conditions for each color while maintaining overall manufacturing feasibility.
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 enables efficient emission of blue and green light with suppressed current density, reduces material waste, and enhances color saturation, resulting in a reliable and convenient display apparatus.
Implementation Method 1
the first intermediate layer has a function of supplying electrons to one of the second unit and the first unit and supplying holes to the other
Implementation Method 2
Light-emitting devices (organic EL devices) including organic compounds and utilizing electroluminescence (EL) have been put to more practical use. Carriers (holes and electrons) are injected by application of a voltage to the element, and light emission can be obtained from the light-emitting material by using the recombination energy of the carriers
Implementation Method 3
The first light-emitting device includes a first reflective film
Data Source
AI summary
Provided is a novel display apparatus that is highly convenient, useful, or reliable. The display apparatus includes a blue-light-emitting device and a green-light-emitting device. The blue-light-emitting device includes a first unit, a second unit, and a first intermediate layer; and the first unit and the second unit each emit blue light. The first intermediate layer is interposed between the first unit and the second unit and supplies electrons to one of them and holes to the other; the second unit includes a first layer containing a first light-emitting material; and the first layer has its central plane a first distance away from a first reflective film. The green-light-emitting device includes a third unit, a fourth unit, and a second intermediate layer; and the third unit and the fourth unit each emit green light. The second intermediate layer is interposed between the third unit and the fourth unit and supplies electrons to one of them and holes to the other; the fourth unit includes a second layer containing a second light-emitting material; the second layer has its central plane a second distance away from a second reflective film; and the second distance is shorter than the first distance.