Backlight Module Notch Compensation via Light Guide Plate Thickness
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Solution Overview
Problem
Conventional edge-lit backlight modules for irregularly-shaped liquid crystal display panels suffer from uneven light distribution due to recessed structures, leading to dark and bright regions, which compromises display quality.
Innovation Solution
The design includes a light-emitting area with a notch and a compensation area adjacent to the notch, where the light guide plate has varying thicknesses and protrusions to enhance light reflection and uniformity, improving light utilization efficiency and luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an edge-lit backlight module is used for irregularly-shaped display panels, then the module achieves light weight, thin shape, and low power consumption, but the recessed structure causes uneven light distribution with dark and bright regions
Solution Approach 1:
The light guide plate is designed with different thicknesses in different regions: a first thickness in the compensation area and a second thickness in the non-compensation area, where the first thickness is greater than the second thickness. This local variation in thickness compensates for the light loss in the recessed notch area, making the light distribution uniform across the entire light emitting surface despite the irregular shape.
2Illumination intensity
If the light guide plate has varying thickness to compensate for the notch, then light distribution uniformity improves, but the manufacturing complexity increases
Solution Approach 1:
The patent changes the thickness parameter of the light guide plate to solve the light distribution problem. By adjusting the thickness in different regions (first thickness in compensation area, second thickness in non-compensation area), the optical path length is modified to compensate for the recessed structure, achieving uniform light distribution without adding complex optical components.
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 ensures uniform light emission and enhanced luminance across the display panel, addressing the issue of uneven light distribution and improving the overall display quality.
Implementation Method 1
the light guide plate has varying thicknesses and protrusions to enhance light reflection and uniformity
Data Source
AI summary
Backlight module and display device are provided. The backlight module includes: a light-emitting area, a non-light-emitting area, at least one notch, a shell, a light source, and a light guide plate, wherein the light-emitting area includes a first edge and a second edge; the first edge includes a sub-edge; the light source is on at least one side of the light guide plate; the light-emitting area includes at least one compensation area adjacent to the notch, and the compensation area is on a side of the notch away from the light source; the light guide plate includes a first portion and a second portion, and the first portion is in the compensation area; a thickness of the first portion is greater than a thickness of the second portion; and a plurality of protrusions is on a side surface of the first portion facing toward the back plate.