Display Panel Micro-Cavity Structure for Brightness Enhancement
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Solution Overview
Problem
Conventional OLED displays face significant brightness loss due to the use of circular polarizers, which reduces their efficiency and requires additional technologies to marginally increase brightness without effectively addressing the issue.
Innovation Solution
A display panel design featuring a micro-cavity structure between the reflection layer and the second electrode, with varying thicknesses of the first color filter layers in sub-pixels to achieve destructive interference for green light and constructive interference for red and blue light, eliminating the need for a circular polarizer and enhancing light intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circular polarizer is added to reduce reflected light influence, then the display can be viewed under ambient light conditions, but the transmissivity drops to about 44% causing significant brightness loss
Solution Approach 1:
The patent changes the optical parameters of the display panel by introducing a micro-cavity structure with specific thickness parameters. The cavity thickness is designed to create destructive interference for reflected light wavelengths while maintaining constructive interference for emitted light, thereby reducing reflected light influence without using a circular polarizer and avoiding brightness loss.
Solution Approach 2:
The patent converts the harmful reflected light into a beneficial effect by using the same reflected light path for destructive interference. The micro-cavity structure causes reflected ambient light to interfere destructively with itself, while the emitted display light interferes constructively, thus turning the harmful reflection into a feature that enhances display performance in ambient light conditions.
2Illumination intensity
If conventional technologies are used to increase light extraction efficiency, then the brightness can be marginally increased, but the fundamental brightness loss caused by circular polarizer cannot be effectively solved
Solution Approach 1:
The patent extracts and removes the circular polarizer from the display structure, replacing it with a micro-cavity structure that achieves the same function of reducing reflected light influence without the 44% transmissivity penalty. This extraction eliminates the fundamental cause of brightness loss while maintaining the ability to display under ambient light conditions.
3Illumination intensity
If the thickness of first color filter layers is varied among sub-pixels, then destructive interference for green light and constructive interference for red and blue light is achieved, but the manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by varying the thickness of the first color filter layer specifically in the green sub-pixel region to achieve destructive interference for green reflected light, while maintaining different thicknesses in red and blue sub-pixels for constructive interference of their respective emitted lights. This localized differentiation optimizes optical performance for each color channel.
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 significantly increases display brightness, reduces power consumption, and prolongs the display's lifespan by minimizing the adverse effects of ambient light, particularly green light, which is most sensitive to human eyes, thereby enhancing the overall display performance.
Implementation Method 1
with varying thicknesses of the first color filter layers in sub-pixels to achieve destructive interference for green light and constructive interference for red and blue light
Data Source
AI summary
A display panel and a manufacturing method thereof, and a display device are provided. The display panel includes a base substrate and a plurality of pixels. Each pixel includes a plurality of sub-pixels of different colors; each sub-pixel includes a reflection layer, a first color filter layer at a side of the reflection layer away from the base substrate, a first electrode at a side of the first color filter layer away from the base substrate, a light-emitting layer at a side of the first electrode away from the base substrate, and a second electrode at a side of the light-emitting layer away from the base substrate. In each pixel, a color of the first color filter layer of the each sub-pixel is same as a color of the respective sub-pixel; thicknesses of the first color filter layers of the plurality of sub-pixels are different from each other.