Display Panel Refractive Index Optimization for Viewing Angle Color Cast
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Solution Overview
Problem
Display devices incorporating OLED and Quantum Dot (QD) technologies face significant issues with brightness attenuation and color cast when viewed from large angles due to the microcavity structure, leading to inconsistent color perception.
Innovation Solution
A display panel design featuring a base substrate with light-emitting elements, a color conversion film layer containing color conversion patterns and particles, and a first film layer with specific refractive indices that increase the critical angle of total reflection, allowing more light to be emitted at large viewing angles and reducing color cast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a microcavity structure is used in OLED display devices, then light emission efficiency is improved, but brightness attenuation and color cast occur at large viewing angles
Solution Approach 1:
The patent changes the refractive index parameter of the first film layer (controlling it to be between 1.70-1.85) to optimize the critical angle of total reflection. This parameter adjustment allows more light to escape at large viewing angles while maintaining the microcavity structure's light emission efficiency, thereby resolving the contradiction between efficiency and viewing angle performance.
Solution Approach 2:
The patent introduces a first film layer with specific optical properties between the light-emitting elements and the color conversion film layer. This local structural modification creates different optical characteristics in different regions of the display panel, enabling improved light extraction at large angles without compromising overall efficiency.
2Use of energy by moving object
If a microcavity structure is used in OLED display devices, then light emission efficiency is improved, but color cast occurs at large viewing angles
Solution Approach 1:
By adjusting the refractive index parameter of the first film layer to a specific range (1.70-1.85), the patent modifies the optical path and light extraction characteristics. This parameter change ensures that light emitted at large viewing angles maintains consistent color properties, preventing color cast while preserving the microcavity structure's efficiency benefits.
Solution Approach 2:
The first film layer acts as an intermediary between the light-emitting elements and the color conversion film layer. It mediates the optical interaction by controlling total reflection and light extraction, ensuring that color information is preserved across different viewing angles while maintaining efficient light emission.
3Illumination intensity
If the refractive index of the first film layer is increased, then the critical angle of total reflection increases and light emission at large viewing angles improves, but the refractive index matching with the matrix becomes more difficult
Solution Approach 1:
The patent optimizes the refractive index parameter of the first film layer to a specific range (1.70-1.85) that balances two requirements: it is high enough to increase the critical angle of total reflection for improved light emission at large viewing angles, but not so high as to create excessive manufacturing difficulty. This parameter optimization resolves the contradiction between performance and manufacturability.
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 increases light emission at large viewing angles and minimizes color cast, enhancing the visual effect by maintaining consistent color perception across different viewing angles.
Implementation Method 1
a critical angle of total reflection at an interface between the first film layer and the matrix is greater than 55°
Implementation Method 2
the color conversion particles are configured to convert light emitted by the light-emitting elements
Data Source
AI summary
The present disclosure provides a display panel, a display apparatus and a method for manufacturing a display panel. The display panel includes: a base substrate; light-emitting elements located on a side of the base substrate; a color conversion film layer located on a side, away from the base substrate, of the light-emitting elements and including a plurality of color conversion patterns in one-to-one correspondence with the light-emitting elements, each color conversion pattern includes a matrix and color conversion particles distributed in the matrix, and the color conversion particles convert light emitted by the light-emitting elements; and a first film layer located between the light-emitting elements and the color conversion film layer and adjacent to the color conversion film layer, a refractive index n1 of the first film layer and a refractive index n2 of the matrix satisfying: n2/n1>0.82.