Backlight Unit Light Source Offset and Fixture Placement
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Solution Overview
Problem
The existing liquid crystal display devices with direct type backlight units require a large number of LEDs across the entire region, leading to increased costs for both the LEDs and the substrate material.
Innovation Solution
The liquid crystal display device incorporates a backlight unit with light sources arranged along one direction, where at least one light source is offset orthogonally, and a fixture is used to fix the light source substrate, allowing for reduced substrate size and material costs by overlapping light sources and fixtures, and utilizing lenses to enhance light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LEDs are disposed across the entire region of the backlight unit, then uniform light distribution is achieved, but substrate size and material cost increase
Solution Approach 1:
The backlight unit is divided into multiple light source groups, each containing a limited number of LEDs arranged in specific patterns (linear, triangular, or wavelike). This segmentation allows the substrate to be smaller while maintaining uniform light distribution through strategic positioning of light source groups across the display region.
Solution Approach 2:
LEDs within each light source group are arranged in two-dimensional patterns (such as triangular or wavelike configurations) rather than simple linear rows. This dimensional arrangement optimizes light coverage and distribution uniformity while reducing the total number of LEDs and substrate area required.
2Illumination intensity
If a large number of LEDs are disposed on the substrate, then sufficient brightness is achieved, but the cost of LEDs and substrate material increases
Solution Approach 1:
Different light source groups are positioned at strategically selected locations rather than uniformly distributed. Each group's composition and arrangement are optimized for its specific position to achieve overall brightness uniformity with fewer total LEDs, reducing both component quantity and cost.
Solution Approach 2:
Multiple light source groups work together in a coordinated manner, with their light output combined to achieve sufficient overall brightness. This merging approach allows fewer individual LED groups to collectively provide the required illumination level that would otherwise require many more separately distributed LEDs.
3Ease of manufacture
If light sources are arranged in a simplified linear pattern, then manufacturing is easier, but light distribution uniformity deteriorates
Solution Approach 1:
Light source groups are arranged in asymmetric patterns such as triangular or wavelike configurations rather than simple symmetric linear rows. These asymmetric arrangements are designed to optimize light distribution uniformity across the display region while remaining manufacturable through standardized positioning techniques.
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 reduces the number of light sources and substrate material needed, while maintaining uniform light distribution across the liquid crystal panel, thereby lowering production costs and enhancing brightness uniformity.
Implementation Method 1
each of the plurality of light sources includes a light source element and a lens which is disposed in front of the light source element
Data Source
AI summary
Provided is a liquid crystal display device (1), including: a liquid crystal panel (2); and a backlight unit (4), which is disposed on a rear surface of the liquid crystal panel (2) and includes a light source substrate (42) onto which a plurality of light sources are mounted and a casing (49), in which: the plurality of light sources are arranged along one direction, and at least one of the plurality of light sources is disposed so as to be offset in a direction orthogonal to the one direction with respect to at least another one of the plurality of light sources; and the backlight unit further includes a fixture (50) for fixing the light source substrate (42) onto the casing (49), the fixture being disposed on a side of the offset light source in an opposite direction to an offset direction.