Backlight Module Light-Supplementing Portions for Uniformity
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Solution Overview
Problem
Existing backlight modules in direct-lit display devices face issues with uneven brightness due to sparse arrangement of mini LEDs, leading to 'starry sky' effects, which increase power consumption and cost while compromising display quality.
Innovation Solution
A backlight module design featuring a substrate with first and second regions, where first light-emitting elements provide primary illumination and light-supplementing portions on a light-guiding plate in second regions compensate for brightness differences, improving uniformity without increasing power consumption or complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If mini LEDs are arranged densely to improve display effect, then light-emitting uniformity is improved, but power consumption and cost increase
Solution Approach 1:
The patent applies local quality by differentiating the substrate into first regions (under LED rows) and second regions (between LED rows) with different light transmittance properties. The light-guiding plate also has differentiated structures: light-shielding portions in first regions and light-supplementing portions in second regions. This local differentiation allows sparse LED arrangement while maintaining uniformity by compensating brightness in second regions without increasing overall power consumption.
2Use of energy by moving object
If mini LEDs are arranged sparsely to reduce power consumption and cost, then power consumption and cost decrease, but light-emitting uniformity deteriorates due to 'starry sky' effect
Solution Approach 1:
The patent introduces a light-guiding plate as an intermediary component between the substrate and the display panel. This light-guiding plate with its light-supplementing portions acts as a mediator that redistributes light from the sparsely arranged LEDs, filling in the dark regions (second regions) to eliminate the 'starry sky' effect while maintaining the sparse, low-power consumption LED arrangement.
Solution Approach 2:
The patent changes the light transmittance parameter of the substrate in different regions, with the light-transmitting region having higher transmittance in second regions compared to first regions. This parameter change enables selective light transmission that compensates for the sparse LED arrangement, improving uniformity without requiring denser LED placement and associated increased power consumption.
3Illumination intensity
If more light-emitting elements are used to improve brightness uniformity, then light-emitting uniformity is improved, but device complexity increases
Solution Approach 1:
The substrate serves multiple functions: it provides mechanical support, electrical connection for LEDs, and acts as a light-guiding structure with region-specific transmittance properties. The light-guiding plate also performs multiple roles: light redistribution, brightness compensation in second regions, and structural support. This multi-functionality achieves brightness uniformity without adding separate dedicated components, thereby avoiding increased device complexity.
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 solution enhances light-emitting uniformity, reduces power consumption, and lowers costs by using fewer light-emitting elements while maintaining brightness requirements, effectively addressing the 'starry sky' issue and improving display quality.
Implementation Method 1
the light-guiding plate can guide the light emitted by the second light-emitting element to the light-supplementing portions for emitting
Implementation Method 2
the first light-emitting elements emit light along a direction perpendicular to a plane where the substrate is located
Data Source
AI summary
The present application discloses a backlight module and a display device. The backlight module includes a plurality of first regions and a plurality of second regions arranged adjacently; the backlight module includes a substrate, including a light-transmitting region, in which the light-transmitting region is at least partially located in the second regions; a plurality of first light-emitting elements, arranged at a side of the substrate, in which the first light-emitting elements are located in the first regions, and the first light-emitting elements emit light along a direction perpendicular to a plane where the substrate is located; a light-guiding plate, arranged at a side of the substrate away from the first light-emitting elements, in which the light-guiding plate includes a plurality of light-supplementing portions located in the second regions; and at least one second light-emitting element, arranged at a side face of the light-guiding plate.