OLED Display Panel With Photochromic Layer For Extended Micro Cavity
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Solution Overview
Problem
The existing OLED display panels face challenges in achieving a longer micro cavity total optical distance, which restricts the enhancement of light emission intensity and efficiency due to the limitations of the organic film layer thickness and refractivity, making it difficult to increase the micro cavity length effectively.
Innovation Solution
The OLED display panel incorporates a photochromic layer that changes from transparent to opaque under light excitation, combined with a transparent anode and a semitransparent cathode, allowing for the formation of a resonant cavity without affecting the voltage drop or electrical properties, and includes an adjustment layer to optimize the micro cavity length, using materials like tin indium oxide and magnesium-silver alloy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a regular F-P optical micro cavity structure with metal-metal reflective mirror surfaces is used, then narrow-line emission is achieved, but the micro cavity total optical distance is restricted and remains short due to limitations of the organic film layer thickness and refractivity
Solution Approach 1:
The patent introduces a low refractive index layer between the substrate and the organic light-emitting layer, adding a new dimensional parameter (refractive index) to the micro cavity structure. This allows extension of the micro cavity total optical distance beyond the limitations of the organic film layer alone, as the low refractive index layer contributes additional optical path length without increasing physical thickness proportionally.
Solution Approach 2:
The patent creates a composite micro cavity structure combining the substrate, low refractive index layer, organic light-emitting layer, and electrode layers. This composite structure allows the micro cavity total optical distance to be optimized by selecting materials with appropriate refractive indices, particularly the low refractive index layer which extends the optical path while maintaining structural integrity.
2Length of stationary object
If the thickness and refractivity of the organic film layer are increased to extend the micro cavity total optical distance, then the micro cavity length can be increased, but this complicates the device structure and affects electrical properties due to voltage drop constraints
Solution Approach 1:
The patent segments the micro cavity structure into distinct functional layers: substrate, low refractive index layer, organic light-emitting layer, and electrodes. By separating the optical function (achieved by the low refractive index layer) from the electrical function (achieved by the organic layer and electrodes), the design allows optimization of optical path length without compromising electrical performance or excessive structural complexity.
Solution Approach 2:
The low refractive index layer acts as an intermediary between the substrate and the organic light-emitting layer. This intermediary layer extends the micro cavity total optical distance without requiring increases in the thickness or complexity of the organic film layer itself, thereby decoupling the optical path length from the organic layer structural complexity.
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 micro cavity total optical distance, enhancing light efficiency and reducing dependency on the organic film layer, resulting in improved adjustable performance and high light emission intensity.
Implementation Method 1
a photochromic layer, being formed on the substrate, and comprising photochromic material which changes from transparent to opaque under excitation of light
Implementation Method 2
an emission layer, formed at one side of the transparent anode away from the photochromic layer, and employed to emit light, and the light comprises a wavelength employed to excite the photochromic material
Implementation Method 3
a semitransparent cathode, formed at one side of the emission layer away from the transparent anode, and employed to pass a portion of the light and reflect the other portion of the light
Data Source
AI summary
The present invention discloses an OLED display panel, comprising a substrate; a photochromic layer, being formed on the substrate, and comprising photochromic material which changes from transparent to opaque under excitation of light; a transparent anode, formed at one side of the photochromic layer away from the substrate; an emission layer, formed at one side of the transparent anode away from the photochromic layer, and employed to emit light, and the light comprises a wavelength employed to excite the photochromic material; and a semitransparent cathode, formed at one side of the emission layer away from the transparent anode, and employed to pass a portion of the light and reflect the other portion of the light. The OLED display panel of the present invention has the longer micro cavity total optical distance. The present invention further discloses a manufacture method of an OLED display panel.