Aspherical Lens Light Spreading for Display Illumination
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Solution Overview
Problem
In display devices, increasing the distance between light emitting element rows to reduce costs results in insufficient light spreading, leading to dark spots due to a lower number of light emitting elements, affecting the overall performance.
Innovation Solution
A dome-shaped aspherical lens with a base concave portion and a curved surface that refracts light more significantly in the Y-axis direction than in the X-axis direction, ensuring sufficient light spreading without increasing the number of light emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of light emitting elements is increased to ensure sufficient light spreading, then light distribution uniformity is improved, but device complexity and cost increase
Solution Approach 1:
The lens applies different refraction characteristics to different regions: the light incident region has a first refraction characteristic while the light non-incident region has a second refraction characteristic. This local differentiation allows the lens to control light spreading efficiently without requiring additional light emitting elements, thereby maintaining illumination uniformity while reducing device complexity
Solution Approach 2:
The patent changes the refraction parameters of the lens by defining different refraction characteristics in different regions. By adjusting the refraction characteristics (first vs second refraction characteristic) based on whether a region receives light or not, the system achieves better light distribution control with fewer light emitting elements, resolving the contradiction between illumination uniformity and device complexity
2Device complexity
If the distance between light emitting element rows is increased to reduce the number of rows, then cost is reduced, but light spreading becomes insufficient causing dark spots
Solution Approach 1:
The lens is divided into regions with different optical functions: the light incident region refracts light from the light emitting element, while the light non-incident region provides additional refraction to compensate for increased spacing. This local quality differentiation enables the lens to maintain light spreading performance even when the distance between light emitting element rows is increased, thereby reducing the number of rows while preventing dark spots
Solution Approach 2:
By changing the refraction characteristics in different regions of the lens, the system compensates for the reduced number of light emitting element rows. The different refraction characteristics ensure that light is properly distributed across the display panel even with larger spacing between rows, maintaining illumination intensity while reducing device complexity
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 allows for effective light spreading in the Y-axis direction, reducing dark spots and maintaining performance even with fewer light emitting element rows, thereby addressing the cost and illumination issues.
Implementation Method 1
a dome shaped aspherical lens body, wherein the lens body includes: a base surface; and a dome shaped curved surface... The light emitting region of the curved surface has an elliptical shape as viewed from a central axis direction centered on the central axis
Data Source
AI summary
The present invention provides a lens for a light emitting element (a luminous flux control member) that can ensure sufficient spread of light even with a smaller number of light emitting elements. The luminous flux control member (10) of the present invention includes: a dome shaped aspherical lens body (11). The lens body (11) includes: a base surface (13); and a dome shaped curved surface (12). The base surface (13) has a base concave portion (131) centered on a central axis, a concave surface of the base concave portion (131) has a light incident region for incident light emitted from a light emitting element, the dome shaped curved surface (12) has a light emitting region for emitting incident light from the light incident region to an outside, the light emitting region of the curved surface (12) has an elliptical shape as viewed from a central axis direction centered on the central axis, in which a length (X) of an X axis orthogonal to the central axis and a length (Y) of a Y axis orthogonal to the central axis and the X axis satisfy X<Y, the light emitting region of the curved surface has a pair of first concave portions (121) on both sides with the central axis interposed therebetween in a cross section including the X axis and the central axis, and the light emitting region of the curved surface has a second concave portion (122) on the central axis in a cross section including the Y axis and the central axis.