Light Guide Recesses for LED Backlight Circuit Integration
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Solution Overview
Problem
Liquid-crystal display devices using LEDs as light sources face challenges in achieving uniform light distribution due to the point nature of LEDs, leading to increased area requirements for mounting electric elements on circuit boards, which complicates the design of compact portable devices.
Innovation Solution
The implementation of a light guide with recesses on its light incident surface allows for the disposition of electric elements between LEDs, reducing the circuit board area and improving light distribution by accommodating the electric elements within these recesses, thereby enabling more compact designs for portable devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LEDs are disposed in a discrete manner on a circuit board to emit high-luminance light, then the light output is improved, but the area of the circuit board increases
Solution Approach 1:
The patent merges the circuit board with the light guide by disposing electric elements directly on the light guide structure. The light guide serves dual functions: guiding light from LEDs and mounting electric elements. This integration eliminates the need for a separate circuit board, thereby reducing overall area while maintaining high-luminance light output from multiple LEDs.
Solution Approach 2:
The light guide is designed to perform multiple functions: it guides light from the LEDs and simultaneously serves as a mounting substrate for electric elements. This multi-functionality allows the system to achieve high luminance with multiple LEDs while minimizing the area required, as the same structure supports both optical and electrical functions.
2Illumination intensity
If multiple LEDs are mounted on a separate circuit board, then high-luminance light is achieved, but the area for mounting electric elements increases
Solution Approach 1:
The patent combines the functions of the circuit board and light guide into a single integrated structure. Electric elements are mounted directly on the light guide, which also serves to guide and distribute light from multiple LEDs. This merging eliminates the need for separate mounting areas, reducing the total area required for both light emission and electric element placement.
Solution Approach 2:
The patent utilizes the surface area of the light guide in a different dimensional arrangement by mounting electric elements on the light guide structure itself. This reorganization of spatial relationships allows electric elements to be positioned in areas that would otherwise be unused or require separate circuit board space, thereby reducing the overall footprint.
3Illumination intensity
If LEDs are disposed discretely to improve light output, then illumination intensity is improved, but device compactness deteriorates
Solution Approach 1:
The patent merges the circuit board and light guide into a single integrated structure, allowing multiple LEDs to be disposed discretely for high luminance output while minimizing the overall device volume. The light guide serves dual purposes as both an optical component and a mounting substrate for electric elements, enabling compact arrangement of all components within a smaller space.
Solution Approach 2:
The light guide performs multiple functions including light guidance, light distribution, and mounting of electric elements. This multi-functionality allows the device to achieve high illumination intensity with multiple discretely disposed LEDs while maintaining compact dimensions, as the same structure supports both optical and electrical functions without requiring additional space.
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 enhances the compactness of portable devices by reducing the area needed for mounting electric elements, improves light uniformity, and simplifies the manufacturing process by allowing for more efficient placement of control circuits and electric components.
Implementation Method 1
The light guide is made of light-transmissive resin or the like, so that light which is emitted from light-emitting devices and enters the light guide
Implementation Method 2
The light guide has reflecting or dispersing members such as grooves, protrusions, or prints. The reflecting or dispersing members cause the light that transmits through the light guide to advance toward the liquid-crystal display device
Data Source
AI summary
A liquid-crystal display device is provided which has a backlight that applies light onto a liquid crystal panel. The backlight includes a light guide having an LED as a light-emitting device. The light guide has recesses on the light incident surface, in which electric elements are disposed. Disposing the electric elements connected to external driving circuit in the backlight can reduce the area for mounting the electric elements.