Concave Reflecting Structure for Light Collimation in Display Modules
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Solution Overview
Problem
In liquid crystal displays (LCDs), backlights irradiate light in various directions, causing crosstalk where light intended for one pixel also illuminates adjacent pixels, leading to inefficiencies and image quality issues.
Innovation Solution
A light emitting module is designed with a substrate, a concave reflecting structure, a first planarizing layer, a first anode, a light emitting layer, and a cathode, where the concave reflecting structure collimates light emitted by the light emitting layer, reducing crosstalk by directing light in a single direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional backlight structure is used, then the device structure is simple, but light is irradiated in various directions causing large crosstalk
Solution Approach 1:
The patent introduces a concave reflecting structure with a curved surface (parabolic or spherical shape) to collimate light. The curved geometry reflects light from the light emitting layer in a uniform direction, converting omnidirectional light into directional light and thereby reducing crosstalk between adjacent pixels.
Solution Approach 2:
The backlight is divided into multiple independent light emitting modules, each corresponding to specific pixels on the liquid crystal panel. Each module has its own concave reflecting structure, allowing independent light control for different pixel regions, thus reducing crosstalk between adjacent pixels.
2Manufacturing precision
If light is irradiated in various directions, then the light distribution is uniform, but crosstalk increases and image clarity decreases
Solution Approach 1:
The concave reflecting structure uses a parabolic or spherical curve to collimate light rays. Light emitted from the focal point region of the light emitting layer is reflected by the curved surface to travel in parallel directions, providing uniform directional illumination while maintaining image clarity.
Solution Approach 2:
The concave reflecting structure is positioned specifically behind the light emitting layer, creating a localized optical control zone. The reflecting structure's geometry is optimized for the specific light emission characteristics of the light emitting layer, providing tailored light direction control without affecting other parts of the display 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 collimated light emitted by the light emitting module minimizes crosstalk by ensuring that most of the generated light is propagated in the same direction, enhancing image clarity and reducing unwanted illumination of adjacent pixels.
Implementation Method 1
a concave reflecting structure on the substrate... an opening of the concave reflecting structure facing the light emitting layer... The collimated light emitted by the light emitting module minimizes crosstalk
Data Source
AI summary
Disclosed herein are a light emitting module, a display device and a method for manufacturing a light emitting module. The light emitting module includes a substrate provided with a concave reflecting structure, a first planarizing layer being arranged on the concave reflecting structure, a first anode being arranged on the first planarizing layer, a light emitting layer being arranged on the first anode, an opening of the concave reflecting structure facing the light emitting layer and a vertical distance from the bottom of the concave reflecting structure to the light emitting layer is a preset distance, a cathode being arranged on the light emitting layer. The method includes: forming a concave reflecting structure on a substrate, forming a first planarizing layer on the concave reflecting structure; forming a first anode on the first planarizing layer; forming a light emitting layer on the first anode; forming a cathode on the light emitting layer.