Light Guide Plate Circuit Integration for Backlight Uniformity
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Solution Overview
Problem
The conventional backlight module fabrication process is complex and costly due to the need for welding LEDs to a circuit board, which is then secured to the light guide plate, leading to nonuniform illumination in large area modules.
Innovation Solution
A circuit is directly configured on the light guide plate with contacts at one or multiple sides for welding LEDs, allowing for simplified assembly and potentially minimizing module size through recesses or holes for LED placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LEDs are welded to a circuit board and then assembled to the light guide plate, then the light source can be provided to the light guide plate, but the fabrication process becomes complex and costly
Solution Approach 1:
The patent merges the circuit board and light guide plate into a single integrated structure. The circuit is printed directly on the light guide plate, eliminating the need for separate welding of LEDs to a circuit board and subsequent assembly to the light guide plate. This integration directly resolves the technical contradiction by simplifying the fabrication process while maintaining the light source functionality.
Solution Approach 2:
The light guide plate is given multiple functions: it serves both as the light guiding component and as the circuit board for mounting LEDs. By printing circuits directly on the light guide plate, the component performs both optical guidance and electrical circuit functions, reducing the number of separate components needed and simplifying the overall fabrication process.
2Illumination intensity
If light sources are provided at one side of the light guide plate, then the assembly is simple, but the illumination becomes nonuniform in large area modules
Solution Approach 1:
The patent applies local quality by positioning LED light sources at specific locations (corners or edges) of the light guide plate based on the display area size. For small areas, one corner LED suffices; for medium areas, two corners; for large areas, four corners or multiple edges. This localized placement strategy ensures uniform illumination distribution across different display sizes without requiring complex multi-side configurations.
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 assembly process, reduces fabrication costs, and ensures uniform illumination in large area backlight modules by directly integrating LEDs with the light guide plate.
Implementation Method 1
The light guide plate has a first surface and a second surface opposite to the first surface. A reflective sheet is provided at the first surface, and a plurality of optical sheets including a diffusing sheet and a prism sheet are provided at the second surface.
Implementation Method 2
a plurality of optical sheets including a diffusing sheet and a prism sheet are provided at the second surface
Implementation Method 3
a plurality of optical sheets including a diffusing sheet and a prism sheet are provided at the second surface
Data Source
AI summary
A light guide apparatus of a backlight module is provided. The light guide apparatus includes a light guide plate and a plurality of LEDs serving as light sources disposed at one lateral side of the light guide plate. The light guide plate includes a circuit configured thereon, and the light sources are welded on the circuit of the light guide plate.