Light Guide Plate V-Structures for Backlight Hotspot Elimination
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Solution Overview
Problem
Large screen LCDs experience an uneven light and dark phenomenon due to the reduced distance between the light source and the viewing region, leading to hotspot issues in the backlight module.
Innovation Solution
A light guide plate with a wedge-shaped design featuring intersecting inclined and vertical V-shaped structures and black ink dots to evenly distribute light, eliminating hotspots by positioning light sources opposite the spaced regions between these structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the distance between light source and viewing region is reduced to achieve large screen and high screen size occupied ratio, then the screen size and occupied ratio are improved, but an uneven light and dark (hotspot) phenomenon is generated at the light incident side
Solution Approach 1:
The light guide plate is divided into multiple functional regions: a plate body with a top surface and a wedge-shaped body with an inclined surface. The inclined surface is further segmented into multiple first inclined V-shaped structures arranged at intervals, and the top surface contains multiple first vertical V-shaped structures. This segmentation allows different regions to control light distribution independently, resolving the hotspot issue while maintaining large screen coverage.
Solution Approach 2:
Different regions of the light guide plate are given different optical properties. The wedge-shaped body with inclined surface and V-shaped structures creates specific light scattering patterns in localized areas. The black ink dots are strategically placed in spaced regions to locally adjust light intensity. This local quality approach enables precise control of light distribution to eliminate hotspots while maintaining overall brightness uniformity across the large screen area.
2Illumination intensity
If V-shaped structures are added to the inclined surface and top surface to distribute light evenly, then light uniformity is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple light control functions into a single integrated light guide plate structure. The plate body and wedge-shaped body are merged into one component, with V-shaped structures and black ink dots integrated directly into the plate. This merging achieves effective light distribution without requiring separate optical elements, thus improving light uniformity while limiting the increase in device complexity.
Solution Approach 2:
The light guide plate serves multiple functions simultaneously: it guides light from the light source, distributes light evenly across the display area through V-shaped structures, and adjusts local light intensity through black ink dots. The wedge-shaped body with inclined surface performs both structural support and optical control functions. This multi-functionality reduces the need for additional components, balancing light uniformity improvement with device complexity management.
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
The solution effectively distributes light evenly, increasing intensity and eliminating the uneven light and dark phenomenon, enhancing the brightness uniformity of the display.
Implementation Method 1
The inclined surface is provided with multiple first inclined V-shaped structures arranged at intervals, and the top surface is provided with multiple first vertical V-shaped structures
Implementation Method 2
the top surface of the plate body is connected smoothly with the inclined surface of the wedge-shaped body
Implementation Method 3
black ink dots are provided at the second spaced region located between the second V-shaped structures so as to increase the light intensity at a front emitting region of the light source
Data Source
AI summary
A light guide plate includes a plate body and a wedge-shaped body extended upward along a terminal of the plate body. A top surface of the plate body is connected smoothly with an inclined surface of the wedge-shaped body. The inclined surface is provided with multiple first inclined V-shaped structures arranged at intervals, and the top surface is provided with multiple first vertical V-shaped structures. The present invention also provides a backlight module having the light guide plate. When a light source is right opposite to a first spaced region (or a second spaced region) corresponding to and located between two first inclined V-shaped structures (or two second inclined V-shaped structures), lights emitted from the light source can be uniformed by the first inclined V-shaped structure and the second inclined V-shape structure in order to eliminate an uneven light and dark phenomenon generated on the inclined surface.