OLED Panel Light Convergence and Divergence Layers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional POL-less OLED display panels suffer from reduced brightness and chromaticity due to the blocking effect of the black matrix on the emissive layer.
Innovation Solution
Incorporating a light convergence layer with a higher refractive index between the encapsulation and color filter layers, and a light divergence layer with a lower refractive index between the color filter and cover plate, utilizing micro lens structures and specific materials like acrylic or fluorinated acrylate polymers, to converge and diverge light effectively, thereby alleviating light blocking by the black matrices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a black matrix is disposed on the emissive layer with certain thickness, then light leakage is prevented and reflection is decreased, but brightness and chromaticity of the panel deteriorate
Solution Approach 1:
A light convergence layer is introduced as an intermediary component between the encapsulation layer and the color filter layer. This layer acts as a mediator that redirects light paths, enabling light to bypass the blocking effect of the black matrix while still maintaining the black matrix's light leakage prevention function. The convergence layer refracts and focuses light toward the color filter layer, resolving the contradiction between blocking light leakage and maintaining brightness.
Solution Approach 2:
The refractive index of the light convergence layer is specifically designed to be higher than that of the encapsulation layer and color filter layer. By changing this optical parameter, the layer creates effective light refraction and convergence effects. This parameter change enables the system to achieve both black matrix light blocking and improved light transmission to the color filter layer, thereby maintaining brightness and chromaticity.
2Object-affected harmful factors
If a black matrix is disposed on the emissive layer with certain thickness, then light leakage is prevented and reflection is decreased, but chromaticity of the panel deteriorates
Solution Approach 1:
The light convergence layer serves as an intermediary that redirects light paths before they reach the color filter layer. By converging light at specific angles, it ensures that light passes through the color filters more effectively, preserving chromaticity information. This mediator function allows the black matrix to prevent light leakage while the convergence layer maintains chromaticity by optimizing light delivery to the color filters.
Solution Approach 2:
By adjusting the refractive index parameter of the light convergence layer to be higher than surrounding layers, the system achieves effective light refraction that preserves chromaticity. This parameter change enables light to be redirected at angles that maintain color information integrity while passing through the color filter layer, thus preventing chromaticity deterioration despite the presence of the black matrix.
3Length of stationary object
If POL-less technology is used to decrease panel thickness, then flexible characteristic is improved, but light extraction efficiency must be optimized
Solution Approach 1:
The optical path management is segmented into multiple functional layers: the encapsulation layer, the light convergence layer, the color filter layer, and the light divergence layer. Each segment performs a specific optical function, with the convergence and divergence layers specifically designed to optimize light extraction efficiency. This segmentation allows the thin-panel POL-less structure to maintain high light extraction efficiency through coordinated optical management across multiple functional segments.
Solution Approach 2:
The refractive index parameters of the light convergence and divergence layers are specifically optimized to enhance light extraction efficiency in the thin-panel structure. By changing these optical parameters, the system compensates for the reduced light extraction path length inherent in thin panels, ensuring that light is effectively extracted and directed through the color filter layer without significant loss, thus maintaining high efficiency in the POL-less thin configuration.
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 brightness and chromaticity of the OLED display panel by allowing more light to pass through the color filter layer, enhancing the display's overall performance.
Implementation Method 1
a light convergence layer is disposed between the encapsulation layer and the color filter layer, the light convergence layer is made of a light convergence material, the light convergence material has a convergent effect on light from the emissive layer; wherein a refractive index of the light convergence layer is greater than a refractive index of the encapsulation layer and the light divergence layer
Implementation Method 2
a light divergence layer is disposed between the color filter layer and the cover plate, the light divergence layer is made of a light divergence material, and the light divergence material has a divergent effect on light from the emissive layer; wherein a refractive index of the light convergence layer is greater than a refractive index of the encapsulation layer and the light divergence layer
Data Source
AI summary
An organic light-emitting diode (OLED) display panel and manufacturing method thereof are provided. A light convergence layer is disposed between an encapsulation layer and a color filter layer in the OLED display panel, and a light divergence layer is disposed between the color filter layer and a cover plate. Through converging light by the light convergence layer, more light passes through the color filter layer. The light passing through the color filter layer is then diverged by the light divergence layer, thereby increasing brightness and chromaticity of the OLED display panel.