Backlight Case Wiring Integration for Narrow Frame LCD
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Solution Overview
Problem
Conventional liquid crystal display devices have a wide frame width due to the need for a separate wiring substrate for the light source unit, which limits the ability to narrow the frame, especially on the side of the light source.
Innovation Solution
A backlight device with a case that includes a wiring pattern directly formed on the case, eliminating the need for an independent wiring substrate, allowing the light-emitting devices to be mounted on the case and connected directly to the wiring pattern, thereby reducing the frame width by integrating the wiring and light source components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a separate wiring substrate is used for the light source unit, then the light source can be mounted and connected, but the frame width increases
Solution Approach 1:
The patent merges the wiring substrate function directly into the case by forming a wiring pattern on the inner surface of the case. This eliminates the need for a separate wiring substrate, thereby reducing the frame width while maintaining the electrical connection functionality. The wiring line and connection portion are integrated into the case structure itself.
2Length of stationary object
If the wiring substrate is eliminated, then the frame width is reduced, but the electrical connection of light sources becomes more complex
Solution Approach 1:
The case is designed to integrate both structural support and electrical wiring functions. The wiring pattern is formed directly on the inner surface of the case, combining the case and wiring substrate into a single component. This reduces the number of parts and assembly steps, improving manufacturing ease despite the integrated design.
Solution Approach 2:
The case serves multiple functions: it provides structural support, houses the light guide, and acts as a wiring substrate for the light sources. By making the case multi-functional, the patent eliminates the need for a separate wiring substrate, reducing frame width while maintaining manufacturing feasibility through a single-component design.
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 significant reduction in frame width, from 5.7 mm to approximately 4.25 mm, by eliminating the need for a separate wiring substrate and allowing the light source unit to be positioned closer to the light guide, resulting in a narrower frame for both the backlight device and the liquid crystal display device.
Implementation Method 1
a light-emitting device mounted on the connection portion and including a light-emitting surface opposing the incident surface of the light guide
Data Source
AI summary
According to one embodiment, a backlight device includes a case with a bottom plate and a plurality of side plates, a wiring pattern formed in the case and including a wiring line and a connection portion, a light guide including an emission surface and an incident surface and arranged on the bottom plate, and a light-emitting device mounted on the connection portion and including a light-emitting surface opposing the incident surface of the light guide and a mount surface opposing the connection portion.