LED Pixel Light Guider Layout for Uniform Display Emission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display apparatuses using LEDs as point sources of light often suffer from low display quality due to visibility differences between regions near and far from the LED, resulting in uneven light emission.
Innovation Solution
A display apparatus design featuring a substrate with an LED positioned above it, a pixel-defining layer with a concave portion to house the LED, a light guider to direct light emitted from the LED, and a light blocker to cover the LED, along with scattered particles and reflection patterns to enhance light distribution and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an LED is used as a point source of light in a display apparatus, then the device structure is simple, but the display quality is poor due to visibility differences between regions near and far from the LED
Solution Approach 1:
A light guider is introduced as an intermediary component between the LED and the pixel-defining layer. The light guider has a refractive index different from both the LED encapsulant and the pixel-defining layer, enabling it to effectively guide and redistribute light from the point-source LED across the emission region, thereby improving display quality without complicating the overall device structure
Solution Approach 2:
The refractive index parameter is strategically changed by introducing the light guider material with a specific refractive index that is intermediate between the LED encapsulant and the pixel-defining layer. This parameter optimization enables effective light guidance and distribution, resolving the contradiction between simple structure and high display quality
2Device complexity
If the LED is positioned at the center of the emission region, then the device structure is simple, but luminance uniformity is poor due to visibility differences across the emission region
Solution Approach 1:
The light guider acts as a mediator that redistributes light from the centrally-positioned LED across the entire emission region. By guiding light laterally through the pixel-defining layer, it achieves uniform luminance distribution without requiring complex LED positioning or additional light sources
Solution Approach 2:
The light guider extends in the lateral dimension across the emission region, transforming the point-source light emission into a distributed light source. This dimensional extension enables uniform illumination across the display area while maintaining simple central LED positioning
3Stability of the object's composition
If a light guider is added to guide light from the LED, then luminance uniformity is improved, but the device structure becomes more complex
Solution Approach 1:
The light guider serves multiple functions simultaneously: it guides light from the LED, defines the emission region boundary, and distributes light uniformly across the display area. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving improved luminance uniformity
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 prevents the LED from appearing as a point source of light, ensuring uniform light emission and improved display quality by guiding and scattering light to reduce luminance disparities across the emission region.
Implementation Method 1
the light guider guides light emitted from the LED to a region adjacent to the second inner side surface of the concave portion
Implementation Method 2
a plurality of scattered particles may be distributed in the light guider
Implementation Method 3
reflection patterns may be disposed in a bottom portion of the concave portion
Implementation Method 4
A light-emitting diode (LED) is a device that converts an electric signal into a form of light, such as infrared light or visible light, by using characteristics of a compound semiconductor
Data Source
AI summary
A display apparatus includes: a substrate; a light-emitting diode (“LED”) disposed above the substrate; a pixel-defining layer disposed above the substrate and including a concave portion which defines a space in which the LED is disposed; a light guider disposed in the space and between the LED and a first inner side surface of the concave portion; and a light blocker disposed above the pixel-defining layer to cover a top portion of the LED. The LED is disposed a second inner side surface of the concave portion, which is opposite to the first inner side surface, and spaced apart from a center of the concave portion, and the light guider guides light emitted from the LED to a region adjacent to the second inner side surface of the concave portion.