LED-Backlit LCD Edge-Mounted PCB Light Guide Integration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional LED-based LCD devices face difficulties in simplifying the installation process, require additional FPC films for electrical connections, and struggle with securing sufficient distance between the LED and light guide plate, leading to complex manufacturing and potential hot spot issues.
Innovation Solution
The LCD device mounts LEDs on an edge of a printed circuit board, with the edge contacting the light inlet part of the light guide plate, eliminating the need for additional FPC films and connectors, and incorporating a heat radiating unit to manage heat generated by the LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a flexible printed circuit film is used to mount LEDs, then the LED can be positioned close to the light guide plate, but the adhesion process becomes highly difficult and requires additional FPC film for electrical connection
Solution Approach 1:
The patent merges the LED mounting function and electrical connection function into a single printed circuit board. The PCB serves both as the structural support for mounting LEDs and as the electrical connection medium, eliminating the need for separate FPC film adhesion processes and reducing manufacturing complexity while maintaining the ability to position LEDs close to the light guide plate
2Object-affected harmful factors
If a mold frame is provided between LED and light guide plate, then hot spot prevention is achieved, but sufficient distance cannot be secured between LED and light guide plate
Solution Approach 1:
The patent introduces a reflective plate as an intermediary component between the LED and the light guide plate. This reflective plate serves dual purposes: it prevents direct contact between the LED and light guide plate (avoiding hot spots) while also reflecting light to maintain illumination efficiency. The PCB structure allows precise positioning of this intermediary element
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 approach simplifies the manufacturing process, reduces costs, and prevents hot spot effects by ensuring a sufficient distance between the LEDs and light guide plate, enhancing the overall efficiency and reliability of the LCD device.
Implementation Method 1
a light emitting diode package mounted on a portion close to an end of the printed circuit board
Implementation Method 2
a heat radiating unit formed on a rear surface of the surface on which the light emitting diode package is mounted to radiate heat generated by the light emitting diode package
Data Source
AI summary
A liquid crystal display device using a light emitting diode includes a liquid crystal panel, a light guide plate including a light inlet part, the light guide plate being arranged at rear side of the liquid crystal panel, a flexible printed circuit film electrically connected to the liquid crystal panel, and a printed circuit board electrically connected to the flexible printed circuit film including a light emitting diode package mounted on a portion close to an end of the printed circuit board contacts the light inlet part of the light guide plate.