Edge-Type Backlight Unit Embedded PCB Groove
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Solution Overview
Problem
The conventional edge-type back light unit structure faces challenges in applying to various LCDs due to increased bezel size and light efficiency issues, particularly when the printed circuit board and LED light source are fixed outside the light guide plate, leading to potential light leakage and image quality degradation.
Innovation Solution
An edge-type back light unit design featuring a light source receiving part with a printed circuit board mounted in an embedded form, where the light source is inserted into a groove on the optical plate, allowing partial overlap with the plate to minimize bezel size and maintain consistent light incidence, thereby reducing light leakage and enhancing stability against heat-induced plate deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the printed circuit board and LED light source are arranged outside the side face of the light guide plate, then the structure is simple and easy to manufacture, but the bezel size increases and cannot be applied to various LCDs
Solution Approach 1:
The printed circuit board is inserted into a groove formed on the light guide plate, nesting the PCB within the optical component structure. This eliminates the need for external mounting while maintaining manufacturing simplicity, and allows adaptation to various LCD sizes by adjusting the groove dimensions.
Solution Approach 2:
The mounting structure transitions from a two-dimensional external arrangement to a three-dimensional embedded configuration within the light guide plate thickness, reducing the horizontal footprint and enabling smaller bezels while maintaining ease of assembly.
2Ease of manufacture
If the printed circuit board and LED light source are arranged outside the side face of the light guide plate, then the structure is simple, but the position of the LED is twisted by stretching of the light guide plate due to heat generation
Solution Approach 1:
By nesting the PCB and LED within a groove on the light guide plate, the structure becomes integrated and moves as a single unit during thermal expansion, preventing relative displacement and maintaining LED position stability while preserving manufacturing simplicity.
Solution Approach 2:
The PCB mounting structure is merged with the light guide plate by forming the groove directly on the plate, creating a unified structure that expands and contracts together thermally, eliminating position twisting while maintaining ease of manufacture.
3Ease of manufacture
If the printed circuit board and LED light source are fixed by making a hole to the light guide plate and inserting a pin, then the fixing is simple, but light is thrown out from the fixing hole and affects picture quality
Solution Approach 1:
The harmful fixing holes that cause light leakage are completely removed from the design. Instead, a groove structure is used that provides mechanical fixing without creating light-leaking openings, thus eliminating the harmful effect while maintaining ease of assembly.
Solution Approach 2:
The groove structure that initially seems to offer less fixing strength than holes with pins actually provides both mechanical retention and optical integrity by containing light within the optical path while still securing the PCB firmly.
4Use of energy by moving object
If the LED and light incidence part of the light guide plate are maintained at constant height and distance for increased light efficiency, then the light efficiency increases, but the structure becomes more complex and less adaptable
Solution Approach 1:
The LED is nested within a groove on the light guide plate, which inherently maintains the optimal height and distance relationship for light incidence. This integrated structure achieves high light efficiency without additional complex positioning mechanisms, as the groove geometry itself enforces the correct spatial relationship.
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 design enhances optical properties and widens application to various LCDs by ensuring consistent light distribution, reducing hot spots, and maintaining image quality through embedded mounting and controlled air gaps, while minimizing bezel size and preventing light leakage.
Implementation Method 1
a light guide plate is a parts performing the brightness of the back light unit and uniform lighting function, and one of plastic molding lens uniformly transferring the emitted light from a light source (LED) to the entire LCD plane
Data Source
AI summary
The present invention relates to a structure of an edge-type back light unit, particularly to a structure comprising a light source receiving part, which receives a light source such as LED formed to the central direction of an optical plate at one side or the other side of the optical plate.The present invention has excellent optical property and has an effect of wide application to various LCDs because it comprises a light source receiving part, which can install a printed circuit board mounting the light source such as LED to an embedded form in an edge-type back light unit.