Display Device Second Bank Light Scattering Particles
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Solution Overview
Problem
Current display devices face challenges in enhancing light emission efficiency, particularly in guiding and scattering light emitted from light emitting elements to improve visibility and color reproduction.
Innovation Solution
The display device incorporates electrodes and a second bank with light scattering particles, such as barium sulfate or titanium oxide, to scatter light emitted from light emitting elements, ensuring it is directed forward and enhancing emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting elements are disposed between electrodes in the opening of the first bank, then light emission is enabled, but light emission efficiency is insufficient without proper light guidance and scattering
Solution Approach 1:
The patent introduces a second bank with light scattering particles as an intermediary component between the light emitting elements and the front direction. This second bank mediates the light propagation by scattering the light in the front direction, thereby improving light emission efficiency and reducing light loss without directly modifying the light emitting elements themselves.
Solution Approach 2:
The patent changes the optical parameters of the bank structure by incorporating light scattering particles (such as barium sulfate, calcium carbonate, titanium oxide, silicon oxide, aluminum oxide, zirconium oxide, or zinc oxide) into the second bank. This parameter change enables effective light scattering in the front direction, transforming the bank from a simple structural element to an active light management component.
2Illumination intensity
If the second bank includes light scattering particles, then light is scattered in the front direction improving visibility, but device structure becomes more complex
Solution Approach 1:
The second bank is designed to perform multiple functions: it provides structural support for the color conversion layer, acts as a light scattering medium to improve visibility, and maintains electrical isolation. By making the bank multi-functional, the patent avoids adding separate components for each function, thereby limiting the increase in device complexity while achieving improved visibility.
Solution Approach 2:
The patent uses composite materials by incorporating light scattering particles into the bank material. This composite structure combines the structural properties of the bank material with the optical scattering properties of the particles, achieving enhanced visibility without requiring a completely separate scattering component.
3Illumination intensity
If electrodes at least partially overlap the second bank, then light guidance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by making the overlap between electrodes and the second bank partial rather than complete. This partial overlap is strategically positioned to provide effective light guidance where needed while avoiding the need for precise complete alignment, thereby reducing manufacturing precision requirements while maintaining light guidance efficiency.
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 significantly improves light emission efficiency by reflecting and scattering light emitted from the elements, resulting in better visibility and color reproduction in display panels.
Implementation Method 1
The light provided to the second bank may be scattered by the light scattering particle of the second bank to be emitted in the front direction of the display panel
Implementation Method 2
light emitted from the light emitting elements may be continuously reflected by the electrodes and the insulating layer to be guided to the second bank
Data Source
AI summary
A display device includes electrodes spaced apart from each other in an emission area, a first bank disposed in a non-emission area, the first bank including an opening overlapping the emission area, light emitting elements disposed between the electrodes in the opening of the first bank, a second bank disposed on the first bank, the second bank including an opening overlapping the emission area, and a color conversion layer disposed in the opening of the second bank. The electrodes at least partially overlap the second bank.