Light Guide Plate Entry Surface for High-Density LED Arrays
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Solution Overview
Problem
Conventional lighting devices for liquid crystal display devices have limited capacity for increasing the number of light-emitting elements, which restricts the improvement of light use efficiency and luminance.
Innovation Solution
A lighting device configuration that includes a light-emitting diode unit with linearly arranged light-emitting diodes and a light guide plate with a shaped light entry surface to accommodate sealing resin elements, allowing for a higher density of light-emitting elements and improved light use efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light-emitting elements and reflecting plates are arranged alternately, then luminance uniformity is improved, but the number of light-emitting elements is limited
Solution Approach 1:
The invention extracts the reflecting plate from the alternating arrangement and replaces it with a light guide plate that has a light-emitting surface. This allows light-emitting elements to be arranged continuously along the longitudinal direction without being interrupted by reflecting plates, thereby increasing the number of light-emitting elements while maintaining luminance uniformity through the light guide plate's light diffusion properties
Solution Approach 2:
The light guide plate serves multiple functions: it guides light from the light-emitting elements, diffuses light to maintain luminance uniformity, and eliminates the need for separate reflecting plates. This multi-functionality allows for a higher density of light-emitting elements while preserving the luminance uniformity that previously required alternating reflecting plates
2Illumination intensity
If the number of light-emitting elements is increased, then luminance is improved, but light use efficiency becomes difficult to improve
Solution Approach 1:
The light guide plate acts as an intermediary between the light-emitting elements and the liquid crystal panel. It efficiently guides and distributes light from increased numbers of light-emitting elements across the display area, ensuring that the additional luminance from more LEDs translates into improved overall light use efficiency rather than just localized brightness increases
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 enables a high-luminance lighting device with increased light-emitting elements, enhancing light use efficiency and luminance while maintaining a compact form factor.
Implementation Method 1
a light guide plate having a light entry surface through which light originated from the light-emitting diode unit enters, and a light-emitting surface from which the light that has entered through the light entry surface is projected, the light guide plate further guiding the light that has entered through the light entry surface to prescribed propagation directions
Implementation Method 2
the light guide plate further guiding the light that has entered through the light entry surface to prescribed propagation directions so that the light is projected from the light-emitting surface
Implementation Method 3
sealing resin elements formed into a prescribed shape and are provided for the respective light-emitting elements to seal the corresponding light-emitting elements on the base member
Data Source
AI summary
Provided is a lighting device (3) that includes a light guide plate (10) having a light entry surface (10a) through which the light originating from a light-emitting diode unit (9) enters, and a light-emitting surface (10c) from which the light that has entered through the light entry surface (10a) exits. The light-emitting diode unit (9) has light-emitting elements (26a and 27a) arranged linearly on a base member (28) with a prescribed interval therebetween, and sealing resin elements (26b and 27b) that seal respective light-emitting elements (26a and 27a). The light entry surface (10a) of the light guide plate (10) is shaped so as to engage with the sealing resin elements (26b and 27b).