Optical Device Combining Two Display Panels for Bright Color Image
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Solution Overview
Problem
Existing projection display apparatuses require multiple display panels and a light source, making it difficult to achieve size and cost reduction while providing a bright color image.
Innovation Solution
An optical device comprising two display panels with different light-emitting elements and a combining optical system that combines their light, eliminating the need for a light source and reducing assembly complexity, using dichroic mirrors to optimize the combination of color light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If three display panels are used to provide a bright color image, then the luminance and color quality are improved, but the device size, assembly complexity, and cost increase
Solution Approach 1:
The patent merges the functions of three display panels into two panels by using a dichroic prism to combine light from only two panels. The dichroic prism reflects specific wavelength ranges from one panel and transmits light from another panel, effectively combining three color channels (red, green, blue) from two physical panels instead of requiring three separate panels.
Solution Approach 2:
Each display panel is designed to emit multiple wavelength ranges. The first display panel emits both first wavelength range (e.g., blue) and second wavelength range (e.g., green), while the second display panel emits third wavelength range (e.g., red). This multi-functionality allows two panels to provide the three primary colors that would traditionally require three separate panels.
2Illumination intensity
If three display panels are used to provide a bright color image, then the luminance is improved, but the number of wiring lines and drive substrates increases
Solution Approach 1:
The patent reduces wiring complexity by merging the display functions into two panels instead of three. Since each panel requires its own wiring lines and drive substrate, using only two panels directly reduces the total number of wiring connections and control circuits needed in the system.
Solution Approach 2:
The display panels are designed with multi-functional light-emitting elements that can emit multiple wavelength ranges. This universality allows a single panel to replace what would traditionally require multiple specialized panels, thereby reducing the overall wiring and drive circuit requirements.
3Illumination intensity
If a liquid crystal panel is used to provide color light, then the color quality is improved, but a light source is required which increases size and cost
Solution Approach 1:
The patent employs self-service by using light-emitting elements (such as OLEDs or LEDs) that generate their own light without requiring an external light source. Each pixel in the display panels contains light-emitting elements that directly produce the required color light, eliminating the need for separate backlight units or illumination systems that would increase device size and cost.
Solution Approach 2:
The patent replaces the mechanical/optical system of a liquid crystal panel that requires a backlight unit with an electro-optical system using light-emitting elements. This substitution eliminates the need for complex light source components, diffusers, and reflectors associated with liquid crystal displays, thereby reducing overall device size and component quantity.
4Illumination intensity
If display panels emitting shorter wavelength light are used, then the luminance is improved, but the life of the display panel decreases
Solution Approach 1:
The patent segments the color emission functions across two display panels with different wavelength characteristics. The first display panel emits shorter wavelength light (e.g., blue) and the second display panel emits longer wavelength light (e.g., red). By distributing the color channels across panels with different stress profiles, the system balances the operational load and extends the overall system life.
Solution Approach 2:
The light-emitting elements are designed with multi-functional capabilities to emit different wavelength ranges. This universality allows the system to optimize luminance output while managing the degradation characteristics of different materials, as longer-wavelength emitting materials generally have longer operational lifetimes than shorter-wavelength materials.
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 provides a bright color image with reduced size and cost, extending the life of the display panels by distributing the load and improving luminance without the need for a light source, while efficiently assembling the display apparatus.
Implementation Method 1
a combining optical system that combines the light emitted from the first display panel and the light emitted from the second display panel
Implementation Method 2
each including a first light-emitting element... each including a second light-emitting element, and a plurality of third pixels, each including a third light-emitting element
Data Source
AI summary
An optical device combines light emitted from first and second display panels. The first display panel emits first color light from a plurality of pixels. The second display panel emits second color light having a different wavelength range from the first color light from a plurality of pixels and emits third color light having a different wavelength range from the second color light from a plurality of pixels.