LED Display Panel Light Filter Layout for Viewing Angle Control
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Solution Overview
Problem
Conventional LCD splicing screens have visible seams due to differing display viewing angles and brightness between LEDs and LCDs, and Mini-LEDs/Micro-LEDs have lower resolution and high cost, necessitating a solution to adjust the viewing angle of LED display panels.
Innovation Solution
An LED display panel with a light filter layer that includes a light-transmitting region and a non-light-transmitting region, where the incident angles of light are set relative to the total reflection critical angle of the filter layer to control light emission, allowing adjustment of the viewing angle by setting the boundary between these regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a splicing screen is composed of LEDs and LCDs to eliminate seams, then the visual quality is improved, but there is a significant difference in brightness between LEDs and LCDs when viewed from a side due to different display viewing angles
Solution Approach 1:
The patent applies local quality by creating a light filter layer with spatially varying properties. The light filter layer includes a light-transmitting region and a non-light-transmitting region with different light transmission characteristics. This local differentiation allows the LED display panel to control light emission angles, making the brightness when viewed from the side similar to that of LCDs, thereby resolving the brightness uniformity issue while maintaining seam elimination.
2Illumination intensity
If the viewing angle of LED display panel is increased to match LCDs, then brightness uniformity is improved, but light leakage increases
Solution Approach 1:
The light filter layer is designed with local quality differentiation where the light-transmitting region allows light passage within a controlled angular range, while the non-light-transmitting region blocks light at larger angles. This spatially selective light transmission controls the viewing angle to match LCD characteristics while preventing light leakage through strategic positioning of the non-light-transmitting region.
Solution Approach 2:
The patent employs a composite light filter layer structure combining regions with different optical properties. The light filter layer integrates both light-transmitting and non-light-transmitting regions, creating a composite optical structure that simultaneously achieves controlled viewing angle and light leakage prevention by leveraging the complementary properties of its constituent regions.
3Manufacturing precision
If Mini-LEDs or Micro-LEDs are used to achieve higher resolution, then the resolution is improved, but the cost increases and the technology is immature
Solution Approach 1:
The patent introduces a light filter layer as an intermediary component between the LED light source and the external environment. This intermediary structure enables conventional LED display panels to achieve controlled viewing angles and improved visual quality without requiring adoption of immature Mini-LED or Micro-LED technologies, thereby avoiding the associated cost increases and technological risks.
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 enables adjustable viewing angles in LED display panels, minimizing light leakage and ensuring uniform brightness across different viewing directions, thereby improving the visual quality of spliced displays.
Implementation Method 1
an incident angle of the light emitted by the light source assembly to the non-light-transmitting region is greater than or equal to the total reflection critical angle of the light filter layer. The total reflection critical angle is a critical angle at which the light exits from an upper surface of the light filter layer.
Implementation Method 2
a refractive index of the light filter layer is greater than a refractive index of a medium outside the upper surface of the light filter layer
Data Source
AI summary
A LED display panel includes a substrate, a light source assembly disposed on the substrate, and a light filter layer disposed on the light source assembly. The light filter layer includes a light filter region. The light filter region includes a light-transmitting region and a non-light-transmitting region disposed outside the light-transmitting region. An incident angle of a light emitted by the light source assembly to the light-transmitting region is less than a total reflection critical angle of the light filter layer, and an incident angle of the light emitted by the light source assembly to the non-light-transmitting region is greater than or equal to the total reflection critical angle of the light filter layer. The total reflection critical angle is a critical angle at which the light exits from an upper surface of the light filter layer. A display device includes the LED display panel.