Display Panel Adjustment Units Suppress Grating Diffraction
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Solution Overview
Problem
OLED displays face reduced light-output efficiency due to circular polarizers, which also increase external light reflection and cause grating diffraction, affecting visual quality.
Innovation Solution
A display panel design with a substrate, array layer, and light-emitting structure layer featuring sub-pixels of the same color, accompanied by first and second adjustment units that introduce a non-zero phase difference to external light beams, suppressing grating diffraction and enhancing light-output efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circular polarizer is attached to the light-emitting surface to reduce external light reflection, then the reflectivity is reduced, but the light-output efficiency is reduced
Solution Approach 1:
The patent removes the circular polarizer from the light-emitting surface structure. Instead of adding a polarizer layer, the invention uses color resistances integrated into the sub-pixel structure to achieve both anti-reflection and maintain light output efficiency, extracting the harmful polarizer component while preserving the desired anti-glare effect
Solution Approach 2:
The patent applies different color resistances to different sub-pixels (red, green, blue) based on their specific color requirements. Each sub-pixel has a tailored color resistance value that matches its emission characteristics, allowing localized optimization of both anti-reflection performance and light output efficiency for each color channel
2Loss of energy
If color resistances are set on the light-emitting surface to improve light-output efficiency, then the light-output efficiency is improved, but external light reflection increases and grating diffraction occurs
Solution Approach 1:
The patent carefully controls and optimizes the parameters of the color resistances, including their thickness, refractive index, and absorption coefficients. By adjusting these parameters within specific ranges, the invention achieves the dual goal of maintaining high light output efficiency while minimizing external light reflection and preventing grating diffraction effects
Solution Approach 2:
The patent employs asymmetric distribution and configuration of color resistances across different sub-pixels rather than uniform application. Each color sub-pixel has specifically tailored resistance characteristics that differ from others, breaking the periodic symmetry that would otherwise cause grating diffraction while maintaining overall display performance
3Device complexity
If periodic sub-pixels of the same color form a diffraction grating, then the structure is simple, but the reflected light beams undergo grating diffraction affecting visual effect
Solution Approach 1:
The patent introduces asymmetric variations in the color resistance parameters of periodic sub-pixels. While the sub-pixels maintain their periodic spatial arrangement for structural simplicity, the color resistance values are deliberately varied within each period, breaking the optical symmetry that causes grating diffraction while preserving the regular structural layout
Solution Approach 2:
The patent applies localized modifications to specific regions of the periodic sub-pixel structure by varying color resistance parameters in a controlled manner. This allows maintaining the overall periodic structure for simplicity while introducing local variations that prevent grating diffraction, optimizing each local region to avoid harmful optical effects
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 design effectively reduces grating diffraction and improves light-output efficiency by ensuring light beams exiting the display panel have a phase difference, thereby enhancing visual quality and reducing external light reflection.
Implementation Method 1
After passing through a first adjustment unit and a second adjustment unit, light beams with a same phase have a non-zero phase difference
Implementation Method 2
the periodic sub-pixels of the same color may form a diffraction grating, such that after the external light beams are reflected by the periodic sub-pixels of the same color, the reflected light beams may undergo grating diffraction
Data Source
AI summary
A display panel includes a substrate; an array layer, disposed on the substrate; a light-emitting structure layer, disposed on the side of the array layer away from the substrate and including a plurality of sub-pixels, including first and second sub-pixels of a same color. The display panel includes first adjustment units and second adjustment units, disposed on the light-emitting structure layer. The first adjustment units are in one-to-one correspondence with the first sub-pixels, and vertical projections of each first adjustment unit and the corresponding first sub-pixel at least partially overlap. The second adjustment units are in one-to-one correspondence with the second sub-pixels, and vertical projections of each second adjustment unit and the corresponding second sub-pixel at least partially overlap. Light beams with a same phase, after passing through a first adjustment unit and a second adjustment unit, have a non-zero phase difference.