Backlight Module Light Guide Plate Brightness Uniformity
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Solution Overview
Problem
Existing backlight modules face challenges in optimizing display effects with a smaller frame size, as increasing the distance between adjacent light emitting diodes to balance brightness leads to a larger module size and uneven light distribution.
Innovation Solution
A backlight module design featuring a light guide plate with intersecting directions, where the dot density between adjacent cluster structures is lower than within the structures, and a second region positioned between the first region and the viewable area, along with optional light-shielding dots and absorbing regions, to enhance brightness between diodes and reduce brightness of emitting regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the distance from the intersection of light emitting regions to the viewable area is increased to balance brightness, then brightness uniformity is improved, but the module size increases
Solution Approach 1:
The light guide plate is divided into multiple regions with different dot densities. The first region has a higher dot density to reduce brightness from light emitting regions, while the second region has a lower dot density to increase brightness between light emitting diodes. This local differentiation allows brightness uniformity to be achieved without increasing the overall module size.
Solution Approach 2:
The light guide plate is segmented into a first region and a second region with distinct dot density characteristics. The first region contains cluster structures with higher dot density near light emitting regions, while the second region has lower dot density between light emitting diodes. This segmentation enables independent optimization of brightness characteristics without compromising the other.
2Illumination intensity
If the dot density between adjacent cluster structures is reduced to increase brightness between diodes, then brightness between light emitting diodes is improved, but light transmission to viewable region decreases
Solution Approach 1:
The light guide plate employs different dot densities in different regions. The second region, positioned between light emitting diodes, has lower dot density to increase brightness in this area. The first region, closer to light emitting regions, has higher dot density to maintain light transmission efficiency. This local quality differentiation resolves the contradiction by optimizing each region independently.
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 increases brightness between adjacent light emitting diodes while decreasing the brightness of emitting regions, optimizing display effects within a smaller frame size without increasing the module's size, and further reduces brightness through light absorption and shielding.
Implementation Method 1
light transmitted to the viewable region via the cluster structures is increased because the dot density between any two adjacent cluster structures is lower than the dot density of each of the cluster structures
Implementation Method 2
the diffusion sheet has a plurality of light-shielding dots thereon, orthographic projections of the plurality of light-shielding dots on the light guide plate are positioned in the first region and are opposite to the light emitting diodes
Data Source
AI summary
The disclosure relates to the technical field of liquid crystal display, and discloses a backlight module and a display device. The backlight module includes a light guide plate and a plurality of light emitting diodes arranged in a first direction, where the light guide plate is provided with a first region and a second region along a second direction, and the first direction and the second direction intersect with each other; and dots of the first region include a plurality of isolated cluster structures, and a dot density between any two adjacent cluster structures is lower than a dot density of each of the cluster structures.