LED Display Panel Light Extraction for Front Viewing Efficiency
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Solution Overview
Problem
Conventional display panels have low light exit efficiency at a front viewing angle due to the self-packaging of LED chips, leading to increased power consumption and reduced service time of devices.
Innovation Solution
A display panel design featuring a substrate with a light extraction structure, including a first and second light extraction portion, and a metal layer, where LED chips are placed on one side of the first light extraction portion away from the substrate, and a thin film transistor array layer is placed on the metal layer, enhancing light reflection and exit efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LED chips are packaged by means of self-packaging, then the process difficulty is reduced, but the light exit efficiency at a front viewing angle is low
Solution Approach 1:
The light extraction structure is divided into multiple portions: a first light extraction portion formed on the substrate, LED chips mounted thereon, and a second light extraction portion covering the first light extraction portion and the LED chips. This segmentation allows each portion to perform specific functions in the light extraction process, improving overall light exit efficiency while maintaining the self-packaging approach.
Solution Approach 2:
The patent introduces a vertical stacking dimension by forming the first light extraction portion on the substrate surface, mounting LED chips thereon, and then covering them with a second light extraction portion. This three-dimensional arrangement enables effective light extraction at the front viewing angle by guiding light through multiple layers, transforming the traditional planar packaging into a vertical light extraction path.
2Adaptability or versatility
If LED chips emit light from all angles, then the light distribution is omnidirectional, but the light exit efficiency at a front viewing angle is low
Solution Approach 1:
The light extraction structure is designed with different portions having different optical properties. The first light extraction portion is formed on the substrate with specific refractive index characteristics, while the second light extraction portion covering the LED chips has optimized optical properties for front viewing angle extraction. This local differentiation of optical qualities enables the structure to selectively enhance light extraction in the front viewing direction while maintaining omnidirectional emission capabilities.
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 design effectively enhances light exit efficiency at the front viewing angle, reducing power consumption and prolonging device service time by ensuring total reflection of light emitted by the LED chips.
Implementation Method 1
By means of the first light extraction portion, the second light extraction portion, and the first metal layer of the light extraction structure, light emitted by the LED chips achieves total reflection and exits toward human eyes
Data Source
AI summary
A display panel and a manufacturing method thereof are disclosed. The display panel includes a substrate, a light extraction structure, and a thin film transistor array layer. The light extraction structure includes a plurality of light emitting diode (LED) chips, a first light extraction portion, a second light extraction portion, and a first metal layer. The second light extraction portion covers the first light extraction portion and the LED chips. Light achieves total reflection after passing through the first light extraction portion and the second light extraction portion and then irradiating a sidewall of the first metal layer, improving the light exit efficiency at a front viewing angle.