Transparent Display Optical Layer for Back-Face Contrast Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing transparent displays face challenges in achieving high contrast when light is incident from the back face.
Innovation Solution
A display device with a configuration that includes a first and second electrode overlapping each other, a light-emitting layer between them, a third electrode capable of forming an electrical field, and an optical adjustment element that changes light transmittance based on the potential difference between the second and third electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a transparent display structure is used to allow background visibility, then transparency is improved, but contrast deteriorates when light is incident from the back face
Solution Approach 1:
The display structure is segmented into multiple functional layers: a first electrode and second electrode for light emission, a third electrode for field control, and an optical adjustment element for light management. This segmentation allows each layer to independently contribute to either transparency or contrast without compromising the other, resolving the contradiction between background visibility and contrast ratio.
Solution Approach 2:
The optical adjustment element acts as an intermediary between the light-emitting structure and the external environment. It mediates the interaction between emitted light and incident back-light, dynamically adjusting light transmission to maintain high contrast while preserving transparency. This intermediary component enables the system to achieve both contradictory requirements simultaneously.
2Measurement precision
If an optical adjustment element is added to control light transmittance, then contrast is improved, but device complexity increases
Solution Approach 1:
The optical adjustment element is merged with the existing electrode structure, where the third electrode serves dual purposes: generating electrical fields for light emission control and controlling the optical adjustment element's light transmission properties. This merging reduces the need for separate control mechanisms and simplifies the overall device architecture while maintaining enhanced contrast performance.
Solution Approach 2:
The third electrode is designed with multi-functionality, serving both as an electrode for the light-emitting element and as a control electrode for the optical adjustment element. This universal component performs multiple functions within a single structure, reducing device complexity while achieving improved contrast through controlled light transmission.
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
Enhances contrast by controlling light from the back face, enabling high-contrast double-sided or transparent displays with reduced power consumption.
Implementation Method 1
an optical adjustment element overlapping the light-emitting layer in a plan view and having light transmittance that changes in accordance with a potential difference between the second electrode and the third electrode
Data Source
AI summary
A display device includes: a light-emitting element including a first electrode and a second electrode overlapping each other in a plan view, and a light-emitting layer placed between the first electrode and the second electrode; a third electrode capable of forming an electrical field between the second electrode and the third electrode; and an optical adjustment element overlapping the light-emitting layer in a plan view and having light transmittance that changes in accordance with a potential difference between the second electrode and the third electrode.