Micro LED Anode and Reflector Structure for Back-Light Extraction
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Solution Overview
Problem
Micro LED displays face challenges with low light extraction efficiency due to the high refractive index of the diode elements and light diffusion in multiple directions, resulting in reduced brightness and visibility.
Innovation Solution
The display device incorporates a substrate with an anode electrode and a reflector plate positioned under the light emitting element, featuring opening portions in the anode electrode to extract light from the back surface and a reflector plate to collect and direct this light towards the front direction, improving light utilization and luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If micro LED elements are used for high definition and upsizing, then display resolution and size are improved, but light extraction efficiency decreases due to high refractive index and multi-directional light diffusion
Solution Approach 1:
The patent divides the light extraction function into two separate paths: front surface extraction and back surface extraction. By segmenting the extraction function, the patent recovers light that would otherwise be lost in the back direction, thereby improving overall light extraction efficiency while maintaining high display resolution with micro LED elements.
Solution Approach 2:
The patent adds a back surface extraction dimension to the traditional front surface extraction. By implementing light extraction from both the front and back surfaces of the micro LED elements, the patent effectively utilizes light in multiple spatial dimensions, converting previously wasted backward-emitted light into useful display light.
2Adaptability or versatility
If micro LED elements emit light in multiple directions, then light distribution is improved, but front direction brightness decreases due to light diffusion
Solution Approach 1:
The patent converts the harmful effect of backward light diffusion into a beneficial resource by implementing back surface extraction. The light that would normally be wasted due to multi-directional emission is now captured and redirected to contribute to the display image, thereby improving front direction brightness without changing the inherent emission characteristics of the micro LED elements.
3Manufacturing precision
If conventional processing for each display panel is used, then manufacturing precision is maintained, but manufacturing complexity and cost increase
Solution Approach 1:
The patent merges the processing of multiple display panels by implementing a common back surface extraction structure that can be applied to all panels. Instead of processing each panel independently with separate extraction structures, the patent combines the extraction function into a shared architecture, thereby reducing manufacturing complexity and cost while maintaining processing precision.
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 configuration enhances the quantity of light in the front direction, thereby increasing the luminance and making the image more visible, while also simplifying manufacturing by allowing processing for each backplane rather than each display panel.
Implementation Method 1
a reflector plate arranged under the anode electrode... the reflector plate collects light emitted from the back surface of the light emitting element and directs it towards the front direction
Data Source
AI summary
According to one embodiment, a display device includes a substrate, an anode electrode, a light emitting element and a reflector plate. The anode electrode is arranged on the substrate. The light emitting element is mounted on the anode electrode. The reflector plate is arranged under the anode electrode, and is arranged to overlap a region where the light emitting element is mounted, in planar view. An anode terminal is arranged on a bottom part and electrically connected to the anode electrode. A cathode terminal is arranged across an entire upper surface on a side opposite to the anode terminal. The anode electrode being smaller than the cathode terminal in a position overlapping the region where the light emitting element is mounted in planar view.