OLED Display Panel Light Extraction Layout for Wide-Angle Brightness
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Solution Overview
Problem
Organic light-emitting display screens face issues with brightness at large viewing angles due to light extraction inefficiencies, leading to color shift and reduced brightness, particularly with green pixels experiencing rapid attenuation.
Innovation Solution
A display panel design featuring a substrate with light-emitting units, a pixel definition layer, and a light extraction layer with strategically positioned light extraction openings, ensuring a minimum distance greater than 4 microns between pixel and light extraction openings to reduce light extraction efficiency and prevent complete loss of large viewing angle light, thereby maintaining brightness and avoiding color shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light extraction technology is used to improve light extraction efficiency, then brightness of the display panel is improved, but brightness of white light image under large viewing angle deteriorates and color shift occurs
Solution Approach 1:
The patent applies local quality by creating different distance relationships between light extraction openings and pixel openings in different regions. Specifically, for light-emitting units in different color regions (red, green, blue), the distance from the light extraction layer to the pixel definition layer is locally adjusted. This localized differentiation optimizes light extraction efficiency for each color while controlling viewing angle performance and color shift, resolving the contradiction between overall brightness improvement and large-angle viewing performance.
2Illumination intensity
If light extraction openings are positioned close to pixel openings, then light extraction efficiency is improved, but color mixture between adjacent pixels occurs
Solution Approach 1:
The patent applies parameter changes by precisely controlling the distance parameter between light extraction openings and pixel openings. The distance is set within a specific range (3-6 micrometers) which optimizes the balance between light extraction efficiency and preventing color mixture. By adjusting this critical distance parameter, the patent achieves sufficient light extraction while maintaining color purity and preventing adjacent pixel interference.
3Use of energy by moving object
If multiple layers with different refractive indices are used, then light-emitting efficiency is improved, but light reflection and refraction increase causing brightness reduction at large angles
Solution Approach 1:
The patent applies the intermediary principle by introducing a matching layer between the light extraction layer and the pixel definition layer. This matching layer has a refractive index that is higher than the light extraction layer, serving as an optical intermediary that reduces reflection and refraction losses. The matching layer mediates the optical interface, improving light extraction efficiency while controlling viewing angle performance by managing the transition of light between layers with different refractive indices.
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 enhances front viewing angle light efficiency, increases display panel brightness, reduces power consumption, and ensures consistent brightness and color accuracy across viewing angles, mitigating color shift and brightness attenuation.
Implementation Method 1
an organic light-emitting display screen includes multiple layers of film structures with different refractive indices, so that light emitted by a pixel will be reflected and refracted in various ways
Implementation Method 2
light emitted by a pixel will be reflected and refracted in various ways and thus cannot be emitted directly above the pixel
Data Source
AI summary
The present application provides a display panel and a display apparatus, and the display panel includes a first light-emitting unit, pixel openings and light extraction openings, and orthographic projections of the pixel openings on the substrate are pixel projections, and orthographic projections of the light extraction openings arranged correspondingly to the pixel openings on the substrate are opening projections; in the first light-emitting unit, in the first light-emitting unit, at least a minimum distance between a first point and a second point greater than 4 microns exists, where the first point is positioned on an edge of a pixel projection of the pixel projections corresponding to the first light-emitting unit, and the second point is positioned on an edge of an opening projection of the opening projections corresponding to the first light-emitting unit. Desired display brightness of display panel at large viewing angle is ensured.