Backlight Assembly Layout for Uniform LCD Center Brightness
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Solution Overview
Problem
Large-sized LCD devices experience reduced brightness at the center due to light sources being disposed near the edges, leading to optical loss and uneven illumination, which affects viewer perception.
Innovation Solution
A backlight assembly with light sources arranged in parallel and a fixing member that includes a reflecting member with inclined surfaces, allowing for denser light source placement towards the center and minimizing optical loss by directing light uniformly across the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light sources are disposed close to the edges of the display area, then edge brightness is improved, but unnecessary light is concentrated on the edges causing optical loss
Solution Approach 1:
The patent applies local quality by creating non-uniform light source spacing where the pitch between adjacent light sources in the central region is smaller than the pitch in other regions. This local adjustment ensures that the central region receives sufficient light density while edge regions maintain adequate brightness, optimizing overall light distribution efficiency and reducing optical loss.
2Object-affected harmful factors
If the pitch between lamps is widened to prevent bright lines, then bright line generation is reduced, but the thickness of the LCD device increases
Solution Approach 1:
The patent implements local quality by varying the pitch between light sources across different regions of the display area. The central region uses a smaller pitch to maintain brightness density, while edge regions use a larger pitch to prevent bright line generation. This regional differentiation allows the device to achieve acceptable thickness without suffering from bright line defects.
3Area of stationary object
If light sources are disposed adjacent to the edges of the display area, then edge coverage is improved, but the center region brightness decreases
Solution Approach 1:
The patent applies local quality by implementing region-specific light source spacing. The central region, which requires higher brightness density, uses a smaller pitch between light sources. The edge regions maintain adequate coverage while allowing for slightly larger spacing. This differentiated approach ensures both center brightness and edge coverage are optimized simultaneously.
4Ease of manufacture
If conventional light source arrangement is used, then manufacturing simplicity is maintained, but light efficiency and brightness distribution are poor
Solution Approach 1:
The patent implements local quality through a practical light source arrangement strategy that maintains manufacturing simplicity while significantly improving light efficiency. The method involves dividing the display area into regions and applying different pitch values to each region, which can be implemented using standard manufacturing processes without requiring complex additional equipment or steps.
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
Enhances brightness at the center of the display area, reducing optical loss and maintaining acceptable brightness at the edges, resulting in a clearer image for viewers while minimizing the thickness of the LCD device.
Implementation Method 1
a reflecting member disposed on the fixing member and reflecting the light emitted from the light sources
Data Source
AI summary
A backlight assembly with excellent light efficiency and a display device provided with the backlight assembly is provided where the backlight assembly includes a plurality of light sources longitudinally arranged in parallel to each other, and a fixing member receiving the plurality of light sources. When a display area, formed by light emitted from the plurality of light sources, is divided by the plurality of light sources into a plurality of display area sections, an average area of the display area sections between light sources adjacent to each other is less than or equal to an area of a display area section between an edge of the display area and the light source most adjacent thereto.