Display Panel Aperture Layout for Wide-Angle Color Deviation
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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 strategically positioned apertures and openings, where the distance between the aperture and light-emitting layer is optimized to minimize light exitance within the visible angle range, using the formula L ≥ d × sin(θ) / n2 - sin^2(θ) to ensure light exits outside the visible angle, thereby reducing color deviation.
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 viewing angles increases
Solution Approach 1:
The patent applies local quality by differentiating the treatment of different color light-emitting elements. Specifically, the distance between the light-shielding layer and green light-emitting elements is set to be greater than the distance between the light-shielding layer and blue light-emitting elements. This localized differentiation optimizes each color channel's light extraction characteristics, reducing color deviation at viewing angles while maintaining fingerprint recognition functionality.
Solution Approach 2:
The patent employs parameter changes by adjusting the distances between the light-shielding layer and light-emitting elements of different colors. By varying these geometric parameters (distances L1, L2, L3 for different color elements), the patent optimizes the light extraction angles and intensities for each color, thereby minimizing color deviation across different viewing angles while preserving the aperture function for fingerprint recognition.
2Adaptability or versatility
If apertures are formed in the light-shielding layer to allow reflected light to enter the fingerprint recognition module, then fingerprint recognition is enabled, but light exitance at large angles increases
Solution Approach 1:
The patent applies local quality by implementing different distance parameters between the light-shielding layer and light-emitting elements of different colors. The green light-emitting elements are positioned at a greater distance from the light-shielding layer compared to blue light-emitting elements. This localized structural differentiation controls the angular distribution of extracted light for each color, reducing large-angle light exitance while maintaining sufficient light for fingerprint recognition.
Solution Approach 2:
The patent employs parameter changes by optimizing the geometric distances (L1, L2, L3) between the light-shielding layer and different color light-emitting elements. By adjusting these parameters, the patent controls the light extraction characteristics, ensuring that light exitance at large angles is minimized while maintaining adequate light intensity for fingerprint recognition functionality.
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, improving user viewing experience and maintaining display quality across various angles.
Implementation Method 1
in order to reduce reflection of ambient light by a metal layer in the panel, a light-shielding layer is provided at a light-exiting side of the display panel
Implementation Method 2
light emitted from a light-emitting element is transmitted to the finger and is then reflected by the finger
Implementation Method 3
light emitted from a light-emitting element is transmitted to the finger and is then reflected by the finger, and the reflected light enters a fingerprint recognition module
Data Source
AI summary
A display panel having a display region and a non-display region. The display panel includes: a substrate; at least one light-emitting element disposed at a side of the substrate and located in the display region, a light-emitting elements includes a light-emitting layer; and a light-shielding layer disposed at a side of the light-emitting elements away from the substrate, the light-shielding layer includes at least one first aperture, 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 satisfyingL≥d×sinθn2- sin2θ,where d denotes a distance between the light-emitting and light-shielding layer, n denotes a refractive index of a functional film layer, θ denotes a visible angle and 0°<θ<90°.