Display Panel Scattering Layer for Contrast and Luminous Efficiency
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Solution Overview
Problem
The use of polarizers in OLED displays leads to lower luminous efficiency due to absorption of light emitted by organic light emitting diodes (OLEDs) and external sunlight, resulting in reduced contrast.
Innovation Solution
A display panel design featuring a light-emitting substrate with a scattering layer between the light-emitting substrate and a photoresist layer, where the light emitted by the substrate passes through the scattering layer and exits from the photoresist layer, and external light is absorbed by the photoresist layer, with an encapsulation film layer reducing the incident angle of light entering the scattering layer, and color filters and black matrices arranged to enhance light absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a polarizer is attached to the top of the screen to enhance contrast, then the contrast is improved, but the luminous efficiency deteriorates due to absorption of light emitted by OLEDs
Solution Approach 1:
The patent removes the polarizer component from the display structure entirely, replacing it with a scattering layer that achieves contrast enhancement through light scattering rather than polarization. This extraction of the harmful polarizer element eliminates the luminous efficiency loss while maintaining contrast improvement.
Solution Approach 2:
The patent introduces a scattering layer as an intermediary component between the OLED and the external environment. This scattering layer mediates the interaction between light and the display structure by scattering external light to enhance contrast without absorbing the light emitted by OLEDs, thus resolving the contradiction between contrast and luminous efficiency.
2Illumination intensity
If a polarizer is attached to the top of the screen to enhance contrast, then the contrast is improved, but the luminous efficiency deteriorates due to absorption of external sunlight
Solution Approach 1:
The patent removes the polarizer that was causing harmful absorption of external sunlight, replacing it with a scattering layer that redirects external light without absorption, thereby eliminating the harmful effect while maintaining contrast enhancement.
Solution Approach 2:
The patent converts the previously harmful absorption of external sunlight by the polarizer into a beneficial scattering effect. The scattering layer takes the external sunlight that would have been absorbed and scatters it to enhance display contrast, turning a harmful factor into a beneficial one.
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 improves the luminous efficiency and contrast of the display panel by optimizing light transmission and absorption, reducing the impact of external light on OLED performance.
Implementation Method 1
a scattering layer is disposed between the light-emitting substrate and the photoresist layer, light emitted by the light-emitting substrate passes through the scattering layer and exits from the photoresist layer
Implementation Method 2
external light passing through the photoresist layer, refracted and/or reflected by the scattering layer, is absorbed by the photoresist layer
Implementation Method 3
external light passing through the photoresist layer, refracted and/or reflected by the scattering layer, is absorbed by the photoresist layer
Implementation Method 4
external light passing through the photoresist layer, refracted and/or reflected by the scattering layer, is absorbed by the photoresist layer
Data Source
AI summary
A display panel and a mobile device are provided. The display panel includes a light-emitting substrate; and a photoresist layer disposed on the light-emitting substrate; wherein a scattering layer is disposed between the light-emitting substrate and the photoresist layer, such that light emitted by the light-emitting substrate passes through the scattering layer and exits from the photoresist layer through the scattering layer, and causes that external light passing through the photoresist layer, refracted and/or reflected by the scattering layer, is absorbed by the photoresist layer.