Display Panel Aperture Layout for Viewing-Angle Color Control
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Solution Overview
Problem
Display panels with fingerprint recognition functions experience color deviation at viewing angles due to increased light exitance at large angles, affecting display performance.
Innovation Solution
A display panel design with a light-shielding layer featuring apertures positioned to ensure that light exiting the panel is refracted outside the visible angle range, preventing color deviation by adjusting the distance between the light-emitting layer and the apertures based on the visible angle, thereby maintaining optimal light distribution within the viewing range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a light-shielding layer with apertures is provided to enable fingerprint recognition, then fingerprint recognition function is achieved, but color deviation at large viewing angles occurs
Solution Approach 1:
The patent applies local quality by differentiating the optical properties of different regions. The aperture region is designed with specific characteristics (openings in light-shielding layer) to enable fingerprint recognition, while the surrounding pixel regions maintain their display functions. This localized differentiation allows the aperture area to have specialized optical properties without compromising the overall display quality in other regions.
Solution Approach 2:
The patent addresses the viewing angle issue by introducing dimensional considerations in the optical path design. By carefully designing the spatial arrangement and dimensions of the aperture relative to the light-emitting layer and light-shielding layer, the patent controls light propagation in three-dimensional space to ensure that reflected light from fingerprints can pass through while display light maintains proper viewing angles.
2Adaptability or versatility
If apertures are formed in the light-shielding layer to allow reflected light entry, then fingerprint recognition is enabled, but light exitance at large angles increases
Solution Approach 1:
The patent applies parameter changes by optimizing the geometric parameters of the aperture structure, including its size, shape, position, and distance from the light-emitting layer. By adjusting these parameters, the patent controls the angular distribution of transmitted light, ensuring that fingerprint reflection light can pass through while limiting excessive light exitance at large viewing angles.
3Measurement precision
If the aperture is positioned closer to the light-emitting layer, then fingerprint recognition sensitivity improves, but color deviation worsens
Solution Approach 1:
The patent optimizes the positional parameter of the aperture relative to the light-emitting layer. By precisely controlling the distance and alignment between the aperture and the light-emitting layer, the patent achieves a balance where reflected light from fingerprints can effectively reach the sensor while the display light maintains proper color characteristics across viewing angles.
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 design effectively alleviates color deviation within the visible angle range, enhancing user viewing experience and maintaining display performance across various angles without affecting fingerprint recognition accuracy.
Implementation Method 1
light exiting the panel is refracted outside the visible angle range
Data Source
AI summary
A display panel having a display region and a non-display region, and the display panel includes: a substrate; light-emitting elements disposed at a side of the substrate and located in the display region, at least one light-emitting element includes a light-emitting layer; and a light-shielding layer disposed at a side of the light-emitting elements facing away from the substrate, the light-shielding layer includes first apertures, and in a direction perpendicular to the substrate, at least one first aperture does not overlap with the light-emitting layer. A distance between a first point on an edge of a first orthographic projection and a second point on an edge of a second orthographic projection is defined as a distance L satisfying L≥d×sinθ/−n2−sin2θ, where d denotes a distance between the light-emitting layer and the light-shielding layer, n denotes a refractive index of a functional film layer, θ denotes a visible angle and 0°<θ<90°.