COB Light-Emitting Module for High-Resolution Displays
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Solution Overview
Problem
Current liquid crystal display devices face challenges in achieving high-definition displays over 100 inches due to complex configurations, yield issues, and cost constraints, while also struggling with uniform color, brightness, and power efficiency.
Innovation Solution
A light-emitting module with a simplified chip-on-board (COB) type configuration that integrates multiple micro light-emitting devices of different colors on a substrate, using a molding part and black matrix to ensure uniform color and brightness, reduce power consumption, and improve manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a liquid crystal display device uses a complex configuration with separate backlight units and optical sheets to achieve high definition, then display resolution is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the light source, color filtering, and liquid crystal modulation functions into a single integrated display panel structure. The light-emitting layer is directly formed on the substrate with color filters and liquid crystal layers stacked together, eliminating the need for separate backlight units and optical sheets, thus reducing device complexity while maintaining high definition display capability
Solution Approach 2:
The display panel serves multiple functions simultaneously: the light-emitting layer provides illumination, the color filters provide color separation, and the liquid crystal layer provides image modulation. This multi-functional integration replaces the need for separate dedicated components for each function, simplifying the overall device configuration
2Illumination intensity
If traditional display devices use separate LED packages mounted on lead frames to achieve high brightness, then luminance is improved, but manufacturing yield and productivity deteriorate
Solution Approach 1:
The light-emitting layer is divided into multiple sub-layers (first light-emitting layer, second light-emitting layer, third light-emitting layer) that can be independently formed and optimized. Each sub-layer can be manufactured separately and then stacked, allowing for independent quality control and higher overall manufacturing yield while achieving high combined brightness
Solution Approach 2:
Instead of mounting LEDs laterally on a planar lead frame substrate, the patent stacks light-emitting layers vertically in multiple tiers. This vertical arrangement increases the effective light-emitting area within the same footprint and simplifies the manufacturing process by eliminating complex wire bonding and mounting operations, thereby improving productivity and yield
3Stability of the object's composition
If liquid crystal display devices use multiple optical sheets and complex light guiding structures to achieve uniform color and brightness, then color uniformity is improved, but device thickness and complexity increase
Solution Approach 1:
The patent combines the functions of light generation, color filtering, and uniformity control into the integrated display panel structure. The color filters are directly formed within the panel layers, and the liquid crystal layer uniformly modulates the light from the light-emitting layer, eliminating the need for multiple separate optical sheets and reducing overall device thickness while maintaining color uniformity
Solution Approach 2:
The color filters are specifically positioned and configured within the display panel to address local color uniformity issues. By integrating the color filters directly in the light path within the panel structure, the design achieves uniform color output without requiring additional external optical components that would increase thickness
4Illumination intensity
If display devices use high power consumption light sources to achieve high brightness and color purity, then luminance and color quality are improved, but energy efficiency deteriorates
Solution Approach 1:
The light-emitting layer directly generates the light needed for display without requiring separate high-power backlight units. The integrated structure allows the light-emitting layer to serve its own illumination needs efficiently, reducing overall power consumption while maintaining high luminance and color purity through optimized material composition and layer structure
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 the production of large, high-resolution displays with excellent color purity and linearity, overcoming the limitations of traditional display technologies by simplifying the configuration and enhancing productivity.
Implementation Method 1
A light-emitting diode (LED) is a p-n junction diode having a characteristic in which electric energy is converted into light energy
Implementation Method 2
when a forward voltage is applied, electrons of an n layer are combined with holes of a p layer, and energy corresponding to band gap energy between a conduction band and a valence band may be generated, and this energy is mainly emitted in the form of heat or light
Implementation Method 3
a nitride semiconductor has received a great interest in a development field of an optical device and a high-output electronic device due to high thermal stability and wide band gap energy thereof
Data Source
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AI summary
An embodiment relates to a light emitting module, a light emitting module manufacturing method, a light emitting cabinet, and a display device. The display device of an embodiment includes: a support frame; and a plurality of light emitting cabinets including a plurality of light emitting modules disposed on the support frame, wherein the plurality of light emitting modules may include a substrate, a plurality of light emitting units directly mounted on the substrate, and a black matrix disposed on the substrate to surround each of the plurality of light emitting units. The embodiment may implement uniform color and uniform brightness by providing a light emitting module providing full color, and may implement slimness and high brightness by simplifying a configuration of the light emitting module in a chip on board (COB) type. The embodiment may implement low power driving and improve productivity and yield by simplifying the configuration of the light-emitting module.