RGB Display Optics Using Dichroic Mirrors Without a Prism
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Solution Overview
Problem
Display devices face issues with heat generation and degradation, and there is a need to reduce their weight and volume.
Innovation Solution
A display device design incorporating multiple display panels with optical lenses and dichroic mirrors that collimate and combine lights of different colors without using a separate prism, allowing parallel emission paths and reducing internal heat and volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate prism structure is used to combine lights of different colors, then light combination function is achieved, but device volume and weight increase
Solution Approach 1:
The patent merges the light combination function directly into the display panel structure by integrating optical lenses and dichroic mirrors at the pixel level. Multiple sub-pixels emitting different colors are combined within the same panel area, eliminating the need for separate external prism structures and reducing overall device volume.
Solution Approach 2:
The patent transitions from a traditional three-dimensional prism-based light combination approach to a two-dimensional planar integration of optical elements on the display panel surface. This dimensional change allows light combination to occur within the plane of the display, significantly reducing the required volume.
2Adaptability or versatility
If a separate prism structure is used to combine lights of different colors, then light combination function is achieved, but device weight increases
Solution Approach 1:
The patent combines the light combination function with the display panel structure, integrating optical lenses and dichroic mirrors directly on the panel. This eliminates the need for separate heavy prism components and reduces overall device weight while maintaining the light combination capability.
Solution Approach 2:
The patent uses thin-film optical elements (optical lenses and dichroic mirrors) that can be deposited directly on the display panel surface. These thin films provide the necessary optical functions with minimal added weight compared to traditional bulky prism structures.
3Temperature
If multiple display panels with parallel emission paths are used, then heat generation is reduced, but device complexity increases
Solution Approach 1:
The patent divides the display into multiple independent display panels or sub-pixel groups with parallel emission paths. Each panel emits light independently in the same direction, preventing heat concentration and reducing overall heat generation. The segmentation is achieved through separate light sources or sub-pixel arrangements that emit parallel light beams.
Solution Approach 2:
The patent creates a universal optical path structure that handles multiple color channels simultaneously through parallel emission paths. The same optical components (lenses, dichroic mirrors) are used for each color channel, reducing the need for separate specialized components and managing complexity through standardized multi-functional design.
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 prevents heat generation and degradation while minimizing the weight and volume of the display device by collimating and combining lights efficiently without a bulky prism structure.
Implementation Method 1
a first optical lens disposed on the first display panel to collimate the first light into first collimated light
Implementation Method 2
a first dichroic mirror disposed on an optical path of the first collimated light, to reflect the first collimated light as first reflected light
Data Source
AI summary
Provided is a display device including a first to third display panels that emit light of different colors, first to third optical lenses arranged on each of the first to third display panels to collimate the first to third lights into first to third collimated lights, a first dichroic mirror that reflects the first collimated light as first reflected light, a second dichroic mirror that transmits the first reflected light as (1_1)st transmitted light and reflects the second collimated light as second reflected light, and a third dichroic mirror that transmits the (1_1)st transmitted light as (1_2)nd transmitted light, transmits the second reflected light as second transmitted light, and reflects the third collimated light as third reflected light.