Top-Emission OLED Exposure Head for Multi-Peak Photoreceptor Exposure
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Solution Overview
Problem
Existing exposure heads with bottom-emission organic light emitting elements have inefficiencies in light utilization and emission spectrum, leading to reduced exposure efficiency and increased residual charge in photoreceptors.
Innovation Solution
The exposure head employs a top-emission organic light emitting element with a structured organic compound layer and optimized film thicknesses to produce a spectrum with multiple peaks and wide wavelength ranges, enhancing light interference and efficient charge separation on the photoreceptor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a bottom-emission organic light emitting element is used in the exposure head, then the device structure is simplified, but the light utilization efficiency is reduced and residual charge increases
Solution Approach 1:
The patent inverts the emission direction of the organic light emitting element from bottom-emission to top-emission configuration. This inversion allows the light to be emitted directly toward the photoreceptor without passing through the substrate, thereby improving light utilization efficiency and reducing residual charge while maintaining device functionality
2Device complexity
If the organic compound layer has a single emission peak, then the light emitting material is simple, but the exposure efficiency is reduced due to insufficient excitation energy variation
Solution Approach 1:
The patent employs composite light emitting materials in the organic compound layer that produce multiple emission peaks. This composite approach combines different light emitting materials or uses specific material compositions that generate broad-spectrum emission with multiple peaks, providing varied excitation energies that improve exposure efficiency and charge generation in the photoreceptor
3Ease of manufacture
If the film thickness of the organic compound layer is not optimized, then the manufacturing process is simpler, but the light interference effect is insufficient and charge separation is reduced
Solution Approach 1:
The patent optimizes the film thickness of the organic compound layer as a critical parameter to achieve constructive light interference. By carefully controlling the thickness within specific ranges, the design enhances light interference effects that improve charge separation efficiency in the photoreceptor, while maintaining manufacturability through precise deposition control
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 configuration improves light utilization efficiency and reduces residual charge on the photoreceptor, ensuring high-quality image formation by effectively exciting the photosensitive layer with varied excitation energies.
Implementation Method 1
an organic light emitting element including a first electrode, a second electrode, an organic compound layer arranged between the first electrode and the second electrode
Implementation Method 2
The photoreceptor drum is exposed to light emitted from these multiple light emitting elements, and an image corresponding to the latent image formed on the photoreceptor drum
Implementation Method 3
optimized film thicknesses to produce a spectrum with multiple peaks and wide wavelength ranges, enhancing light interference
Data Source
AI summary
An exposure head comprising an organic light emitting element. The organic light emitting element includes a first electrode, a second electrode, an organic compound layer arranged between the first electrode and the second electrode, and a protection layer covering the second electrode. The organic compound layer includes a light emitting layer, and the number of peaks in an exposure spectrum emitted from the exposure head is greater than the number of peaks in a PL spectrum of the light emitting material included in the light emitting layer.