Display Panel Optical Bump Structure for Wide-Angle Color Uniformity
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Solution Overview
Problem
Display panels using active matrix organic light emitting diodes face issues with color shift and luminance uniformity when viewed from different angles due to varying light emitting angles of different color light emitting elements, leading to poor display effects.
Innovation Solution
A display panel design incorporating an optical adjustment pattern with a first bump structure and a first planarization layer, where the bump structure adjusts the light emitting angle of light emitting elements to improve luminance uniformity and reduce color shift by increasing the light emitting angle of some light beams and decreasing others, thereby enhancing display effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If different color light emitting elements emit light at different angles, then each element can achieve its optimal luminance, but color shift and luminance uniformity deteriorate when viewed from different angles
Solution Approach 1:
The patent applies local quality by configuring different bump structures (first bump, second bump, third bump) at different locations and for different color light emitting elements. Each bump structure has specific geometric parameters (height, radius, shape) tailored to adjust the light emitting angle of corresponding color elements, creating localized optical corrections that collectively improve overall color consistency and luminance uniformity across viewing angles.
2Adaptability or versatility
If the light emitting angle is increased to improve viewing angle coverage, then luminance uniformity improves, but color shift increases
Solution Approach 1:
The patent employs parameter changes by systematically varying the geometric parameters of different bump structures including height (h1, h2, h3), radius (r1, r2, r3), and shape characteristics. These parameter variations enable precise control over light emitting angles for different color elements, allowing the system to expand viewing angle coverage while maintaining color consistency through optimized optical path adjustments.
3Manufacturing precision
If a complex optical adjustment structure is added to correct color shift, then display quality improves, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the optical adjustment function into multiple discrete bump structures (first bump, second bump, third bump) that can be independently designed and manufactured. Each bump serves a specific optical correction function for particular color elements, allowing modular optimization of display quality while maintaining manageable manufacturing processes through standardized fabrication techniques.
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 improves the uniformity of light emission at different angles and reduces color shift, resulting in a more consistent and improved display performance across various viewing angles.
Implementation Method 1
an overlapping region being present between an orthographic projection of the first bump structure on the substrate and an orthographic projection of the light emitting element corresponding to the first bump structure on the substrate
Implementation Method 2
a first planarization layer, disposed on a side, departing from the light emitting element, of the optical adjustment pattern, wherein a refractive index of the first planarization layer is greater than a refractive index of the optical adjustment pattern
Data Source
AI summary
Provided is a display panel. The display panel includes: a substrate; a plurality of light emitting elements, disposed on the substrate; an optical adjustment pattern, disposed on a side, departing from the substrate, of the light emitting elements, wherein the optical adjustment pattern includes a first bump structure corresponding to at least one light emitting element of the plurality of light emitting units, an overlapping region being present between an orthographic projection of the first bump structure on the substrate and an orthographic projection of the light emitting element corresponding to the first bump structure on the substrate, an area of the overlapping region being less than an area of the orthographic projection of the light emitting element on the substrate; and a first planarization layer, disposed on a side, departing from the light emitting element, of the optical adjustment pattern.