Light Guide Plate Triangular Prism Pattern Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In light guide plate display devices, unwanted patterns are visible due to light reflection from non-corresponding light sources, making them appear darker than intended patterns when a light source is turned on.
Innovation Solution
The display device incorporates a light guide plate with triangular pyramid prisms, where one inclined surface is a reflective surface for the corresponding light source and the other inclined surfaces act as diffusion surfaces to redirect light from non-corresponding sources outside the desired viewing angle, reducing visibility of unwanted patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If prisms with reflective inclined surfaces are used to reflect light from light source devices toward the display surface, then the quantity of reflected light is increased and patterns can be switched, but light from non-corresponding light source devices is also reflected toward the display surface, causing unwanted patterns to be visible
Solution Approach 1:
Each prism is configured with different surface properties: one inclined surface has a reflective inclined surface that reflects light from its corresponding light source device, while other inclined surfaces have diffuse reflective surfaces that scatter light from other light source devices. This local differentiation of surface properties ensures that each prism selectively reflects light from its intended light source while diffusing unwanted light from other sources, thereby eliminating the visibility of unwanted patterns while maintaining adequate reflected light intensity.
2Illumination intensity
If the area of reflective inclined surfaces is increased to enhance light reflection for pattern switching, then the brightness of displayed patterns is improved, but more light from non-corresponding light sources is reflected, increasing visibility of unwanted patterns
Solution Approach 1:
The reflective inclined surface area is optimized for each prism to reflect sufficient light from its corresponding light source device while the other inclined surfaces are configured with diffuse reflective properties. This local quality differentiation allows each prism to maintain adequate brightness for its intended pattern while preventing unwanted patterns from becoming visible through controlled light scattering.
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
This configuration effectively reduces the visibility of patterns other than the one corresponding to the active light source, enhancing the display by minimizing the appearance of darker, unwanted patterns.
Implementation Method 1
one of inclined surfaces of the triangular pyramid groove is formed as a reflective surface configured to reflect light that is emitted from the light source corresponding to a pattern along which the prism is arrayed
Implementation Method 2
another inclined surface of the triangular pyramid groove is formed as a diffusion surface configured to reflect light that is emitted from a light source different from the light source corresponding to the pattern
Data Source
AI summary
A display device includes a light guide plate 2 having at least one incoming surface and a plurality of light sources (3-1 to 3-4) arranged to face any of the incoming surfaces. The light guide plate 2 has a plurality of prisms 11 that is arrayed along each pattern in a plurality of patterns (21 to 24) displayed on one surface 2b of the light guide plate and reflects light emitted from a light source corresponding to the pattern and entering the light guide plate through the incoming surface toward a direction within a prescribed range of angles with reference to a direction normal to the other surface 2c of the light guide plate. Each prism 11 is formed as a triangular pyramid groove in one surface of the light guide plate 2, and one of inclined surfaces of the triangular pyramid groove is formed as a reflective surface 11a that reflects light emitted from a light source corresponding to a pattern along which the prism is arrayed and entering the light guide plate.