Quantum Dot Display Electrode Layout for Lower Light Leakage
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Solution Overview
Problem
Conventional display devices utilizing quantum dots for improved color saturation face inefficiencies due to non-directive converted light leading to leakage and poor luminous efficiency, as all quantum dots are not fully utilized.
Innovation Solution
The display device incorporates a substrate with a transistor, insulating layer, light blocking layer, and light emitting and conversion elements, where the light emitting element is positioned in openings of the insulating layer with a non-flat shape first electrode that extends along the side surface, enhancing light reflection and utilization by the light conversion element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dot materials are applied to convert excitation light into desired colors, then color saturation is improved, but light leakage and loss occur due to non-directive converted light
Solution Approach 1:
The patent introduces a vertical dimension by positioning the light emitting element below the quantum dot layer and using a reflective electrode structure. This transforms the conventional horizontal light emission into a vertical configuration where light is generated below, converted by quantum dots above, and reflected back through the quantum dot layer, ensuring all converted light is utilized without lateral leakage.
Solution Approach 2:
The reflective electrode acts as an intermediary between the light emitting element and the quantum dot layer. It receives light from the emitting element, reflects it upward through the quantum dot layer for color conversion, and ensures that converted light is directed back through the same path, preventing lateral leakage while maintaining color saturation.
2Device complexity
If conventional light emitting elements are used as light sources, then device structure is simplified, but luminous efficiency is poor due to incomplete utilization of quantum dots
Solution Approach 1:
The patent ensures continuous utilization of the quantum dot layer by having light pass through it twice - once upward for color conversion and once downward after reflection. This continuous action through the same quantum dot material maximizes luminous efficiency without requiring additional quantum dot layers or complex optical paths.
Solution Approach 2:
The patent replaces conventional lateral light extraction mechanisms with a vertical reflection-based system. Instead of relying on lateral emission and extraction, the system uses vertical light propagation combined with reflective electrodes to achieve complete light utilization, substituting mechanical light guidance with optical reflection principles.
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 increases the light emitting area, reduces light leakage, and improves the utilization and efficiency of quantum dots, leading to enhanced luminous efficiency and color conversion.
Implementation Method 1
Quantum dots can convert excitation light emitted by a light emitting element into the converted light of desired color
Implementation Method 2
the light emitting element includes an electrode electrically connected to the transistor... increasing the light emitting area, reduces light leakage
Data Source
AI summary
The disclosure provides a display device. The display device includes a substrate, a transistor, an insulating layer, a light blocking layer, a light emitting element, and a light conversion element. The transistor is disposed on the substrate. The insulating layer is disposed on the substrate. The insulating layer includes at least one opening. The light blocking layer is disposed on a top surface of the insulating layer and at least partially overlapped with the transistor. The light emitting element is disposed in the at least one opening, and the light emitting element includes an electrode electrically connected to the transistor. The light conversion element is disposed on the light emitting element.