OLED Viewing Angle Film for Wide Viewing Without Brightness Loss
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Solution Overview
Problem
Conventional OLED display panels face a trade-off between achieving a large viewing angle and maintaining front viewing angle brightness, as improving the viewing angle inevitably results in energy loss and reduced brightness.
Innovation Solution
A display panel design featuring a light emitting device layer with a first viewing angle curve optimized for maximum light emission efficiency at a side viewing angle, combined with a viewing angle adjustment film that adjusts the light emission efficiency maximum value point to a main viewing angle, using microstructures and a filler layer with varying refractive indices to achieve a second viewing angle curve without sacrificing front viewing angle brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a viewing angle improvement member is disposed on the external of the display panel to improve large viewing angle, then the viewing angle is improved, but the front viewing angle brightness is reduced due to energy loss
Solution Approach 1:
The patent introduces a viewing angle adjustment film as an intermediary component between the light emitting device layer and the external environment. This film contains light adjusting micro-structures that act as mediators to redirect light rays without significant energy loss, thereby improving viewing angle while preserving front viewing angle brightness.
Solution Approach 2:
The patent changes the optical parameters of the display panel by adjusting the film thickness of the light emitting device layer to correspond to the light emission efficiency maximum value point, and by introducing the viewing angle adjustment film with specific micro-structure designs. These parameter changes enable simultaneous optimization of both viewing angle and brightness.
2Adaptability or versatility
If photons are emitted at different angles to improve viewing angle, then the viewing angle is improved, but energy is lost resulting in reduced brightness
Solution Approach 1:
The patent applies local quality by designing light adjusting micro-structures with specific local optical properties. These micro-structures are distributed throughout the viewing angle adjustment film and locally manipulate light rays to redirect them toward the desired viewing angles while minimizing energy loss in the process.
Solution Approach 2:
The patent replaces conventional mechanical or structural viewing angle improvement methods with an optical field-based approach using the viewing angle adjustment film. This optical substitution allows for more efficient light manipulation that preserves energy while achieving the desired viewing angle improvement.
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 design allows for a large viewing angle to be achieved without lowering the front viewing angle light emission brightness, maintaining excellent brightness and viewing angle performance under constant color conditions.
Implementation Method 1
a viewing angle adjustment film disposed on a side of the light emitting device layer away from the substrate; wherein the viewing angle adjustment film is configured to adjust the light emission efficiency maximum value point from the side viewing angle to a main viewing angle
Implementation Method 2
an anti-reflection layer disposed on a side of the viewing angle adjustment film away from the substrate
Data Source
AI summary
The present application provides a display panel and a manufacturing method thereof. The display panel includes a substrate, a light emitting a device layer, and a viewing angle adjustment film. The light emitting device layer comprises a first viewing angle curve, a film thickness of the light emitting device layer is a film thickness corresponding to a light emission efficiency maximum value point of the first viewing angle curve. The viewing angle adjustment film is configured to adjust the light emission efficiency maximum value point from a side viewing angle to a main viewing angle and obtain a second viewing angle curve to obtain a large viewing angle under a prerequisite without lowering a front viewing angle light emission brightness.