OLED Panel Black Matrix and Filter Film for External Light Interference
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Solution Overview
Problem
Organic light emitting diode (OLED) displays face interference from external light, which affects display contrast and increases device thickness, hindering flexibility, as current solutions like circular polarizers reduce light efficiency and add bulk.
Innovation Solution
An OLED display panel with a flexible substrate, a thin film transistor array, a black matrix layer, a light emitting module with red, green, and blue subpixels, and a filter film layer with uneven surfaces to absorb non-target light bands, combined with a light transmissive film to concentrate emitted light, reducing external interference and thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circular polarizer is mounted on an OLED device to prevent external light interference, then display contrast is improved, but device thickness is greatly increased
Solution Approach 1:
The circular polarizer is divided into two separate functional layers: a polarizing layer and a quarter-wave phase compensation layer. These layers can be disposed at different positions within the OLED structure, allowing independent optimization of each layer's function while reducing overall device thickness compared to a monolithic circular polarizer assembly.
Solution Approach 2:
The patent transitions from a conventional planar OLED structure to a three-dimensional stacked architecture where the polarizing layer and phase compensation layer are positioned at different vertical levels within the device. This spatial arrangement in the third dimension enables effective anti-reflection functionality while maintaining a compact overall profile.
2Object-affected harmful factors
If a circular polarizer is mounted on an OLED device to prevent external light interference, then display contrast is improved, but flexibility is greatly affected
Solution Approach 1:
By segmenting the circular polarizer into separate polarizing and phase compensation layers, each layer can be independently optimized for flexibility. The thin-film structure of each layer allows them to bend and conform to flexible substrates without the rigid constraints of a thick monolithic polarizer assembly.
Solution Approach 2:
The patent employs thin-film structures for both the polarizing layer and phase compensation layer, which inherently possess flexible characteristics. These thin films can be integrated onto flexible substrates, enabling the OLED device to maintain flexibility while achieving effective anti-reflection performance through the stacked layer configuration.
3Object-affected harmful factors
If a circular polarizer is mounted on an OLED device to prevent external light interference, then anti-reflection performance is improved, but light emitting efficiency is greatly reduced
Solution Approach 1:
The segmented structure allows the polarizing layer and phase compensation layer to work cooperatively with optimized orientation relationships. The polarizing layer selectively blocks external light while the phase compensation layer restores phase relationships for emitted light, minimizing energy loss. This division enables independent optimization of each layer's optical properties to maximize light efficiency.
Solution Approach 2:
The patent optimizes the orientation angle between the polarizing layer and phase compensation layer (typically at specific angles such as 45 degrees) to achieve optimal performance. By adjusting this angular parameter, the system maximizes the anti-reflection effect while minimizing the impact on light emitting efficiency, allowing the OLED to maintain high brightness and energy 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
The solution effectively prevents external light interference, enhances light emitting efficiency, and improves flexibility by absorbing non-target light bands and concentrating emitted light, addressing the limitations of traditional OLED displays.
Implementation Method 1
a filter film layer including a red filter, a green filter, and a blue filter, wherein the red filter, the green filter, and the blue filter are respectively correspondingly disposed on one of the red subpixels, one of the green subpixels and one of the blue subpixels of the light emitting module
Implementation Method 2
a light transmissive film is disposed on the filter film layer and has a refractive index higher than a refractive index of the filter film layer, so that light emitted from the light emitting module is concentrated toward the filter film layer
Implementation Method 3
a light emitting module disposed on a surface of the black matrix layer and the pixel defining layer, and including a plurality of pixel units, wherein each of the pixel units includes a red subpixel, a green subpixel, and a blue subpixel
Data Source
AI summary
An organic light emitting diode display panel includes a thin film transistor array layer disposed on a flexible substrate, and including thin film transistors, a reflective anode, and a pixel defining layer. The pixel defining layer has a patterned structure defining non-light emitting regions and light emitting regions, each being between the non-light emitting regions; a black matrix layer disposed on the non-light emitting regions; a light emitting module disposed on a surface of the black matrix layer and the pixel defining layer, and including a plurality of pixel units. Each pixel unit includes a red subpixel, a green subpixel, and a blue subpixel respectively correspondingly disposed in one light emitting region and disposed on the reflective anode; a filter film layer including a red filter, a green filter, and a blue filter respectively correspondingly disposed on one red subpixel, one green subpixel and one blue subpixel.