LED Display Panel Reflective Layer for Small-Pixel Brightness
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Solution Overview
Problem
The metal electrode of light emitting diodes (LEDs) limits the area of the light emitting layer, resulting in insufficient effective light emitting area and brightness in small-sized display devices.
Innovation Solution
A display panel configuration that includes a circuit substrate, a light emitting diode with a first and second semiconductor layer and a light emitting layer, and a reflective layer in contact with the side surface of the light emitting diode, positioned between the light emitting diode and the circuit substrate to enhance luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the size of the light emitting diode is reduced, then the response speed and reliability are improved, but the effective light emitting area becomes insufficient
Solution Approach 1:
The patent introduces a reflective layer positioned at the side surface of the light emitting diode, utilizing the vertical dimension and lateral space to redirect light that would otherwise be lost. This dimensional approach allows the small-sized LED to achieve enhanced light output without increasing its planar footprint.
Solution Approach 2:
The patent converts the harmful effect of light being blocked or lost at the side surface and metal electrode interfaces into a beneficial effect by using the reflective layer to redirect this light toward the light emitting area, thereby improving overall luminous efficiency.
2Area of stationary object
If the size of the light emitting diode is reduced, then the device integration is improved, but the brightness becomes insufficient
Solution Approach 1:
By utilizing the vertical dimension and lateral space through the reflective layer, the patent enables small-sized LEDs to achieve enhanced brightness without compromising device integration. The reflective layer captures and redirects light in three-dimensional space, maximizing light output from a compact structure.
Solution Approach 2:
The patent transforms the potentially harmful light loss at the side surfaces and metal interfaces into beneficial light output by using the reflective layer to redirect these rays toward the viewing area, thereby enhancing brightness in miniaturized devices.
3Illumination intensity
If a reflective layer is added to improve luminous efficiency, then the brightness is improved, but the device complexity increases
Solution Approach 1:
The reflective layer is applied selectively at the side surface of the light emitting diode rather than throughout the entire device. This localized approach improves luminous efficiency and brightness while minimizing the increase in device complexity by concentrating the reflective function only where needed.
4Loss of energy
If the reflective layer is positioned to contact the side surface, then the light reflection efficiency is improved, but the manufacturing precision requirement increases
Solution Approach 1:
The patent specifies that the reflective layer contacts a portion of the side surface rather than requiring precise alignment at a specific height. This parameter change in the positioning approach allows for greater manufacturing tolerance while maintaining effective light reflection, as the reflective layer can contact the side surface at various positions to achieve the desired optical effect.
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 configuration improves the luminous efficiency of the display panel by effectively reflecting rays emitted by the light emitting layer, thereby enhancing the brightness of the display device.
Implementation Method 1
The reflective layer is in contact with a part of a side surface of the light emitting diode. A part of the reflective layer is located between the light emitting diode and the circuit substrate... effectively reflecting rays emitted by the light emitting layer
Data Source
AI summary
A display panel, including a circuit substrate, a light emitting diode, and a reflective layer, is provided. The light emitting diode includes a light emitting layer and first and second semiconductor layers. The light emitting layer is located between the first and second semiconductor layers. The second semiconductor layer is located between the first semiconductor layer and the circuit substrate. The reflective layer is in contact with a part of a side surface of the light emitting diode. A part of the reflective layer is located between the light emitting diode and the circuit substrate. Taking a direction perpendicular to a top surface of the circuit substrate as a height direction, a horizontal height of a top surface of the reflective layer is located between a horizontal height of a top surface of the light emitting layer and a horizontal height of a top surface of the light emitting diode.