Diffraction Pattern Layer for Display Light Control
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Solution Overview
Problem
Display devices, particularly organic light-emitting display devices, face challenges in maximizing the effective light-emitting area ratio and minimizing image blurring due to limitations in light distribution and pixel arrangement.
Innovation Solution
Incorporating a diffraction pattern layer with specific periodic arrangements of diffraction patterns on the optical path of light emitted from light-emitting elements, along with an input sensing layer and encapsulation layers, to expand the light-emitting area and optimize light distribution, while maintaining image clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the light-emitting area is increased to improve display efficiency, then the effective light-emitting area ratio increases, but image blurring occurs due to excessive light diffusion
Solution Approach 1:
The patent applies parameter changes by precisely controlling the period and dimensions of the diffraction patterns in the diffraction pattern layer. By adjusting the period of the diffraction patterns to satisfy specific relationships with the pixel pitch and wavelength of light, the patent optimizes light distribution to increase the effective light-emitting area ratio while preventing image blurring through controlled diffraction angles.
Solution Approach 2:
The patent introduces a diffraction pattern layer as an intermediary component between the light-emitting element and the viewer. This layer acts as a mediator that controls and directs light distribution, enabling the expansion of effective light-emitting area while maintaining image clarity by diffracting light at specific angles determined by the pattern geometry.
2Productivity
If diffraction patterns are added to expand light distribution, then effective light-emitting area increases, but device structure becomes more complex
Solution Approach 1:
The patent applies universality by designing the diffraction pattern layer to serve multiple functions simultaneously: it expands the effective light-emitting area ratio, controls light distribution angles, maintains image clarity, and can be integrated with existing display structures. The same diffraction patterns achieve both light diffusion and focal point control without requiring separate components.
3Manufacturing precision
If the period of diffraction patterns is increased to reduce blurring, then image clarity improves, but effective light-emitting area ratio decreases
Solution Approach 1:
The patent resolves this contradiction through parameter changes by establishing specific mathematical relationships between the period of diffraction patterns, pixel pitch, and wavelength of light. By optimizing these parameters together rather than independently, the patent achieves both high image clarity and high effective light-emitting area ratio, demonstrating that coordinated parameter optimization can overcome traditional trade-offs.
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 effectively increases the effective light-emitting area ratio and minimizes image blurring, enhancing the display's emission efficiency and visual clarity by carefully controlling light diffusion and pixel spacing.
Implementation Method 1
a diffraction pattern layer disposed on the encapsulation layer. The diffraction pattern layer may include a plurality of diffraction patterns arranged to have a first period in one direction
Data Source
AI summary
A display device, including: a substrate; a first light-emitting element disposed on the substrate; an encapsulation layer disposed on the first light-emitting element; an input sensing layer disposed on the encapsulation layer; and a diffraction pattern layer disposed on the input sensing layer. The diffraction pattern layer may include a plurality of diffraction patterns arranged to have a first period in one direction.