Backlight Unit Circuit Routing for Narrow Frame LCDs
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Solution Overview
Problem
Conventional liquid crystal display devices face the challenge of requiring a wider frame due to the positioning of flexible circuit boards, which is inefficient and affects the design and production of compact electronic devices.
Innovation Solution
The design incorporates a light source board with cut-out intervals that allow the flexible circuit board to pass through, maintaining a narrow frame by optimizing the placement of light sources and circuit boards, enabling a more compact and efficient structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the flexible circuit board is passed outside the light sources radially, then the circuit board can be properly routed, but the frame width must be widened to accommodate this space
Solution Approach 1:
The flexible circuit board is routed in the circumferential direction along the light source board rather than radially outward, changing the routing dimension from radial to tangential. This allows the circuit board to pass through the narrow space between adjacent light sources without requiring frame widening.
Solution Approach 2:
The circuit board routing is localized to specific regions between adjacent light sources on the light source board. By utilizing the existing gaps between light sources for circuit board passage, the design maintains narrow frame width while ensuring proper circuit board routing in the circumferential direction.
2Use of energy by moving object
If light sources are arranged to surround the light guide member with intersecting light directions, then illumination efficiency is improved, but the frame must be widened to accommodate the circuit board passing space
Solution Approach 1:
The light source board is segmented into multiple light sources arranged circumferentially around the light guide member. This segmentation allows light to be emitted from multiple points in different directions, improving illumination efficiency while the gaps between segments provide space for circuit board routing without frame widening.
Solution Approach 2:
The circuit board routing transitions from radial passage (requiring frame width) to circumferential passage along the light source board. This dimensional change allows the routing to occur in the gaps between light sources in the tangential direction, maintaining compact frame dimensions while preserving illumination efficiency.
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 allows for a narrower frame, improved production efficiency, and reduced leakage light, enhancing the display quality and design flexibility of liquid crystal display devices.
Implementation Method 1
a light guide plate having an outer shape conforming to an outer shape of the display panel, and configured to guide light from the light sources
Data Source
AI summary
A liquid crystal display device includes a liquid crystal panel, a liquid crystal panel flexible circuit board, and a backlight unit. The backlight unit includes LEDs, a light guide plate, a chassis, and an LED board. The light guide plate has an outer shape conforming to an outer shape of the liquid crystal panel. The chassis including a sidewall portion which surrounds the light guide plate and the LEDs. The LED board has an outer shape conforming to the outer shape of the light guide plate. The LEDs are mounted on the LED board at intervals in the circumferential direction. The LED board includes LED mount portions, and LED interval portions. The LED interval portions include a cut-out LED interval portion. Between the cut-out LED interval portion and the sidewall portion, a liquid crystal panel flexible circuit board passing space is provided.