Concave Lens Unit for Light Guide Panels With Lower Loss Light
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Solution Overview
Problem
Existing display apparatuses face inefficiencies in utilizing light emitted from light source units due to vertical light entry into the light guide panel, leading to loss light that does not reach the liquid crystal layer for display, resulting in reduced luminance and power inefficiency.
Innovation Solution
Incorporating a lens unit with a concave light entering surface between the light guide panel and the light source unit, arranged in a direction crossing the light emitting diode elements, to redirect light towards the liquid crystal layer, minimizing loss light and enhancing luminance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a lens is arranged between the light guide panel and the light source unit, then light diffusion is improved, but light entering vertically still reaches the opposite side of the light entering surface without reaching the liquid crystal layer, causing loss light
Solution Approach 1:
The light entering surface of the lens unit is designed as a concave surface with a specific curvature radius. This curved geometry redirects vertically entering light rays at angles that prevent them from reaching the opposite side of the light guide panel, instead directing them toward the liquid crystal layer to eliminate loss light while maintaining diffusion performance
Solution Approach 2:
The patent specifies precise parameters for the concave surface including curvature radius (50-200 μm) and depth (10-50 μm). By optimizing these dimensional parameters, the lens effectively changes the light propagation path to redirect vertical light rays toward the liquid crystal layer, converting what would be loss light into useful display light
2Ease of operation
If light enters vertically into the light guide panel, then the light source unit can be positioned facing the side surface, but the light does not reach the liquid crystal layer for diffusion, reducing luminance efficiency
Solution Approach 1:
The concave lens unit serves as an intermediary optical element between the light source unit and the light guide panel. It receives vertically entering light rays and redirects them at controlled angles to reach the liquid crystal layer, thereby mediating the light path to simultaneously enable side-surface positioning and maintain luminance efficiency
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 effectively reduces loss light, improving luminance efficiency and power utilization by ensuring more light contributes to image display, potentially reducing power consumption and enhancing display quality.
Implementation Method 1
a lens unit arranged between the light guide panel and the light source unit... The light entering surface of the lens unit is a concave surface extending in the first direction
Data Source
AI summary
A display apparatus includes: a light guide panel; a light source unit including a plurality of light emitting diode elements arranged in an X direction at a position facing a side surface of the light guide panel; and a lens unit arranged between the light guide panel and the light source unit. The light source unit, the lens unit and the light guide panel are arranged in a Y direction crossing the X direction. The lens unit includes: a light entering surface facing the light source unit; and a light emitting surface being opposite to the light entering surface and facing the side surface of the light guide panel. The light entering surface of the lens unit is a concave surface extending in the X direction.