Acute-Angled Light Guide Plate for Uniform Backlight Distribution
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Solution Overview
Problem
Existing backlight modules in liquid crystal displays (LCDs) face challenges in meeting the demands of thinner and narrower frames, leading to issues like hot spots, smear defects, and light leakage due to manufacturing tolerances and inefficient light distribution.
Innovation Solution
A backlight module design featuring a light guide plate with acute-angled side surfaces and strategically positioned light sources, along with reflecting structures on the side and second surfaces to enhance light reflection and reduce energy loss, is proposed. The light source is fixed on a back plate with a groove, and reflecting films are formed on the side surfaces to ensure efficient light guidance and minimize leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the backlight module uses conventional light guide plate design with right-angled side surfaces, then the manufacturing process is simple, but light leakage and brightness uniformity are poor
Solution Approach 1:
The patent applies asymmetry by changing the side surface angle of the light guide plate from the conventional right angle (90 degrees) to an acute angle (30-60 degrees). This asymmetric geometric modification optimizes light reflection paths, prevents light leakage at edges, and improves brightness uniformity across the display panel while maintaining manufacturing feasibility through standard molding processes.
2Device complexity
If the light source is positioned centrally in the backlight module, then the structure is simple, but hot spots and smear defects occur
Solution Approach 1:
The patent transitions from central light source positioning (one-dimensional symmetry) to edge-based positioning combined with inclined side surfaces (introducing angular dimensionality). The light source is positioned at the edge of the light guide plate, and the acute-angled side surfaces create optimized light reflection paths in multiple dimensions, eliminating hot spots and smear defects while improving overall brightness uniformity.
3Manufacturing precision
If the side surface angle of the light guide plate is increased to reduce light leakage, then light distribution improves, but the device thickness increases
Solution Approach 1:
The patent optimizes the side surface angle parameter within a specific range (30-60 degrees) to achieve the best balance between light distribution uniformity and device thickness. This parameter optimization ensures effective light reflection and prevention of light leakage while maintaining a compact profile suitable for thin display devices, avoiding both excessive thickness and insufficient light uniformity.
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 effectively addresses brightness abnormalities and prevents hot spots, ensuring uniform light distribution and reducing the thickness of the display device, making it suitable for narrow frame and frameless products while maintaining high display quality.
Implementation Method 1
the light emitted by the light source is at least partially reflected by the first light reflecting structure after entering the light guide plate
Data Source
AI summary
A backlight module, a method of manufacturing the backlight module, a display device and an illuminating device are disclosed. The backlight module includes: a light guide plate having a first surface and a second surface opposed to each other and at least one side surface between the first surface and the second surface, the side surface being provided with a first light reflecting structure and having an acute angle with respect to the first surface; a light source disposed at a side of the first surface, an orthographic projection of the light source onto the first surface being at an edge portion of the first surface adjacent to the side surface, wherein the light emitted by the light source is at least partially reflected by the first light reflecting structure after entering the light guide plate through the first surface of the light guide plate.