Dichroic Prism Light Guiding Section for Display Brightness
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Solution Overview
Problem
Existing display apparatuses face challenges in achieving high light utilization efficiency due to incident angle dependence of dichroic mirrors, particularly when nonpolarized light from multiple display panels is synthesized and guided, leading to decreased brightness and image recognition issues.
Innovation Solution
A display apparatus configuration that includes multiple display panels with nonpolarized light emission, utilizing a synthesis optical system with obliquely positioned dichroic mirrors and a plate-shaped light guiding section to minimize incident angle dependence, ensuring that the effective luminous flux has a small range of incident angles to the dichroic mirrors, thereby improving light utilization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dichroic prism with intersecting dichroic mirrors is used to synthesize light from multiple display panels, then color synthesis capability is improved, but light utilization efficiency deteriorates due to incident angle dependence
Solution Approach 1:
The patent changes the geometric parameters of the light guiding section, specifically making the first and second surfaces extend in different directions (first direction and second direction perpendicular to the first direction) to control the incident angles of light on the dichroic mirrors. This parameter adjustment ensures that light from multiple display panels incident on the dichroic mirrors has a small range of incident angles, thereby improving light utilization efficiency while maintaining color synthesis capability
Solution Approach 2:
The patent introduces a new spatial dimension by having the first and second surfaces of the light guiding section extend in perpendicular directions (first direction and second direction). This dimensional arrangement allows for better control of light paths and incident angles on the dichroic mirrors, resolving the contradiction between color synthesis and light utilization efficiency
2Device complexity
If display light from only one display panel is guided to allow an observer to recognize an image, then device complexity is reduced, but image brightness deteriorates
Solution Approach 1:
The patent merges light from multiple display panels (first display panel and second display panel) through the dichroic prism and light guiding section to create a synthesized light output. This combining of multiple light sources increases the overall illumination intensity and image brightness while managing the complexity through integrated optical 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 configuration enhances light utilization efficiency by reducing the impact of incident angle dependence, allowing for a brighter image recognition with improved radiation angles, even when using nonpolarized light from organic electroluminescence elements.
Implementation Method 1
a synthesis optical system which includes a first dichroic mirror that passes one of the first display light emitted from the first display panel and the second display light emitted from the second display panel and reflects the other to thereby synthesize the first display light and the second display light
Implementation Method 2
a first display panel having a plurality of pixels and configured to emit nonpolarized first display light; a second display panel having a plurality of pixels and configured to emit nonpolarized second display light
Implementation Method 3
a plate-shaped light guiding section which has a first surface extending from a first end to a second end in a first direction and a second surface facing the first surface on a first side in a second direction, which is perpendicular to the first direction, and extending from the first end to the second end in the first direction, and is configured to guide synthesized light emitted from the synthesis optical system to be directed from the first end to the second end in the first direction while reflecting the synthesized light between the first surface and the second surface
Data Source
AI summary
A dichroic prism synthesizes display light emitted from a plurality of display panels, and a plate-shaped light guiding section guides the synthesized light to a light-emitting section. In the display light emitted from the respective pixels of the display panel, although a radiation angle of an effective luminous flux which reaches the eye of an observer is large in a direction corresponding to the vertical direction, a range of incident angle of intersecting effective luminous fluxes to the dichroic mirror is small.