Lens Light Source Unit Oblique Luminance Segmentation
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Solution Overview
Problem
Conventional direct backlights for liquid crystal display devices do not effectively distribute light in oblique directions, leading to reduced luminance when viewed from angles other than directly front, making them unsuitable for dual-view or quartet-view applications.
Innovation Solution
A lens design that covers the light-emitting surface of a light source, featuring a light transmitting region divided by a light blocking region to separate light into beams traveling in oblique directions, ensuring peak luminance in these directions, and includes a concave light incident surface and an inverted V-shaped light exit surface to enhance light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional direct backlight with LEDs is used, then the light source can be arranged all over the back surface to achieve high luminance, but the light travels only in a direction substantially perpendicular to the flat surface and does not travel in oblique directions
Solution Approach 1:
The light transmitting region is divided into a plurality of light transmitting regions by the light blocking region, creating multiple beam paths that travel in different oblique directions. This segmentation allows the backlight to provide high luminance in multiple viewing angles simultaneously, resolving the contradiction between achieving high luminance and enabling oblique viewing.
Solution Approach 2:
Different regions of the lens have different functions: the light blocking region blocks light in certain directions while the light transmitting regions transmit light in oblique directions. This local differentiation of optical properties enables the backlight to maintain high luminance while directing light specifically in oblique viewing angles.
2Ease of operation
If a microlens array is used to collimate light, then light can be emitted in a controlled direction, but the light travels only perpendicular to the surface and peak luminance is achieved only in front of the backlight
Solution Approach 1:
Instead of collimating light to travel perpendicular to the surface (conventional approach), the invention inverts the approach by using a light blocking region to prevent perpendicular light travel and a light transmitting region to enable oblique light travel. This inversion allows the backlight to achieve peak luminance in oblique directions, enabling dual-view capability while maintaining controlled light direction.
3Device complexity
If light is emitted only in perpendicular direction to achieve high luminance, then the backlight structure can be simple, but the luminance level decreases significantly when viewed from oblique angles
Solution Approach 1:
The lens is segmented into light blocking and light transmitting regions, creating a relatively simple structure that can be integrated with existing LED backlights. This segmentation enables oblique light transmission without requiring complex multi-component systems, thus maintaining device simplicity while improving luminance in oblique directions.
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 enables a light source unit with peak luminance in oblique directions, making it suitable for dual-view or quartet-view liquid crystal display devices by efficiently guiding light away from the optical axis and controlling its exit direction.
Implementation Method 1
a light transmitting region which transmits the light from the light source; and a light blocking region which blocks the light from the light source
Implementation Method 2
a light incident surface, through which surface the light from the light source enters the lens, has a concave shape that is curved more sharply than the light-emitting surface of the light source
Implementation Method 3
a light exit surface through which the light from the light source exits, the light exit surface having, when viewed in cross section, an inverted V shape
Data Source
AI summary
A lens cap (3) is arranged to cover a light-emitting surface (23) of a light source (2), the lens thereby guiding light from the light source (2) in oblique directions relative to the light source (2). The lens cap (3) includes, in a planar view, a light transmitting region (33) and a light blocking region (34), the light transmitting region (33) divided into a plurality of light transmitting regions by the light blocking region (34) so that the light from the light source (2) passes through the plurality of light transmitting regions (33) and is separated into beams traveling in different directions.