Prism Light Guide Plate for Uniform Backlighting
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Solution Overview
Problem
Existing display devices face issues with display effects due to large angles of incidence of light, leading to incomplete backlight formation and blurred scenery behind a prism light guide plate, as scattering and deflection occur, affecting normal viewing.
Innovation Solution
A light transmission device with a first prism layer featuring reflective grooves and prism bars that redirect light to a single direction, combined with a spacer layer to adjust optical path deflection, and a collimated light source for precise light control, enabling both backlight and transparent display modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a prism light guide plate is used to improve brightness, then brightness is improved, but light scattering occurs causing large angles of incidence and affecting display effects
Solution Approach 1:
The light guide plate is segmented into multiple functional layers: a first prism layer with prism bars for light redirection, a reflective layer with grooves for light reflection, and optionally a second prism layer. This segmentation allows each layer to perform a specific function, collectively achieving uniform backlighting while maintaining clear transparent display effects.
Solution Approach 2:
Different regions of the light guide plate have different structures optimized for their specific functions. The first prism layer has prism bars at specific positions for light redirection, the reflective layer has grooves with reflective surfaces at specific angles, and the second prism layer has matching prism bars. This local quality optimization ensures uniform light distribution without excessive scattering.
2Area of stationary object
If the angle of incidence of light source is large, then light coverage is improved, but emergence angle cannot completely reverse propagation directions and normal backlighting cannot be formed
Solution Approach 1:
The light guide plate uses a composite structure combining multiple materials and layers: a first prism layer material, a reflective layer material, and optionally a second prism layer material. Each material is selected and configured to work together, where the prism bars redirect light and the reflective surfaces bounce light, collectively achieving uniform backlighting even with large incident angles.
Solution Approach 2:
The invention changes the optical parameters of the light guide plate by introducing prism bars with specific angles and reflective surfaces with specific orientations. The angle between reflective surfaces and the direction perpendicular to the first direction is α, and the angle between prism surfaces and the first direction is 45°+α+β/2, where β is the angle of incident light. These parameter changes enable the system to handle large incident angles while maintaining uniform backlighting.
3Illumination intensity
If a prism light guide plate is used, then light deflection occurs for backlighting, but objects behind the prism light guide plate cannot be seen through and scenery becomes blurred
Solution Approach 1:
The invention extracts the backlighting function from the transparent display function by using a multi-layer structure. The first prism layer and reflective layer are specifically designed for backlighting, while the overall structure maintains optical clarity for transparent display. This separation allows each function to be optimized independently without compromising the other.
Solution Approach 2:
The light guide plate structure acts as an intermediary between the light source and the display panel. The prism bars and reflective surfaces are configured to redirect light in specific directions for backlighting, while allowing ambient light to pass through with minimal distortion for transparent display. This intermediary structure reconciles the conflicting requirements of backlighting and transparent display.
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 ensures normal uniform backlighting even with large angles of incidence and allows for clear viewing through the prism light guide plate by directing light effectively, enhancing display quality and visibility.
Implementation Method 1
the prism surfaces of the first prism bars are configured to emit received light reflected from corresponding reflective surfaces towards the panel in a first direction
Implementation Method 2
the spacer layer has a refractive index lower than those of the first prism layer and the second prism layer; the second prism layer and the spacer layer are configured to adjust optical path deflection direction of ambient light when the ambient light enters the first prism layer to offset parts of deflection of the ambient light
Data Source
AI summary
The present disclosure discloses a light transmission device including a first prism layer. The first prism layer includes a plurality of first prism bars formed on a surface of the first prism layer facing away from the panel, and a plurality of reflective grooves formed on a surface of the first prism layer facing the panel. Each of the reflective grooves includes a plurality of reflective surfaces matching with prism surfaces of the first prism bars; the reflective surfaces reflect received light to corresponding prism surfaces; the prism surfaces of the first prism bars are configured to emit received light reflected from the corresponding reflective surfaces towards the panel in a first direction.