LED Backlight Device With Deviated Pitch For Uniform Illumination
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Solution Overview
Problem
Conventional LED backlight units require a large number of LEDs to maintain uniform light distribution, increasing costs without reducing the number of LEDs, as reducing the number of LEDs can affect light uniformity.
Innovation Solution
The proposed backlight unit arranges LEDs in a substrate with varying pitches and positions, using a combination of red, blue, and green LED chips or white LED chips, and incorporates a sidewall with a white sheet to diffuse light, ensuring uniformity even with a reduced number of LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LEDs are arranged in a matrix with identical pitch between adjacent rows and columns, then uniform light distribution is achieved, but the number of LEDs increases and cost increases
Solution Approach 1:
The patent applies local quality by differentiating the pitch between different regions of the LED array. Specifically, the pitch between adjacent columns in the first matrix portion is set to a first pitch value, while the pitch between adjacent columns in the second matrix portion is set to a second pitch value that is greater than the first pitch. This localized variation in pitch allows reduction of LED quantity in certain regions while compensating for uniformity through the specific geometric arrangement and optical properties of the display panel.
2Ease of manufacture
If the number of LEDs is reduced to lower cost, then manufacturing cost decreases, but light uniformity is affected
Solution Approach 1:
The patent employs asymmetry by dividing the LED array into two distinct matrix portions with different pitch characteristics. The first matrix portion has a smaller pitch (first pitch) while the second matrix portion has a larger pitch (second pitch > first pitch). This asymmetric arrangement allows the system to use fewer total LEDs compared to a uniform fine-pitch arrangement, thereby reducing manufacturing cost while maintaining acceptable light uniformity through the complementary arrangement of the two portions.
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 LEDs needed while maintaining uniform light distribution, thereby lowering costs without compromising image quality.
Implementation Method 1
incorporates a sidewall with a white sheet to diffuse light, ensuring uniformity even with a reduced number of LEDs
Data Source
AI summary
A backlight unit usable in a liquid crystal display. In one embodiment, the backlight unit includes a substrate, a first plurality of light emitting elements positioned on the substrate, and a second plurality of light emitting elements positioned on the substrate, where the first plurality of light emitting elements positioned on the substrate are arranged in rows, such that two neighboring rows define a first pitch therebetween and the second plurality of light emitting elements positioned on the substrate are arranged in a row such that the row of the second plurality of light emitting elements is separated from the closest neighboring row of the first plurality of light emitting elements by a second pitch, where the first pitch is less than the second pitch.