Light Source Module Reflection Adjustment Pattern
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Solution Overview
Problem
Liquid crystal display (LCD) backlight assemblies experience luminance non-uniformity due to light reflection from printed circuit boards (PCBs) causing light to be concentrated above the LED light sources, leading to poor light quality and display quality in LCD devices.
Innovation Solution
A light source module with a printed circuit board (PCB) featuring a reflection adjustment pattern having different reflection characteristics than the insulating coating layer, positioned around the light emitting chip, helps control refracted light and improve luminance uniformity by reducing light concentration above the LED chip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light is emitted from side or lower portion of LED light source and reflected by PCB, then light is refracted in upper direction and concentrated above LED light source, but luminance non-uniformity occurs
Solution Approach 1:
The patent applies local quality by creating a reflection adjustment pattern with specific reflection characteristics in the local area around the light emitting chip. This pattern has different reflection characteristics than the surrounding insulating coating layer, allowing selective control of light reflection in specific zones to prevent unwanted light concentration and improve luminance uniformity across the display surface.
Solution Approach 2:
The patent converts the harmful effect of light reflection from the PCB (which causes luminance non-uniformity) into a beneficial effect by deliberately designing a reflection adjustment pattern. This pattern strategically reflects light that would otherwise be wasted or harmful, redirecting it to improve overall luminance distribution and uniformity across the display surface.
2Ease of operation
If optical lens is arranged on upper portion of light emitting chip to diffuse light, then diffusibility of light is heightened, but light from side/lower portion reflected by PCB causes concentration above LED and deteriorates light quality
Solution Approach 1:
The reflection adjustment pattern provides localized light reflection control in specific areas of the PCB, complementing the optical lens's diffusion function. By creating zones with different reflection characteristics around the light emitting chip, the system achieves both effective light diffusion from the lens and controlled light reflection from the PCB, preventing luminance non-uniformity while maintaining high light quality.
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
The solution enhances luminance uniformity and color purity, thereby improving the light quality of the backlight assembly and display quality of the LCD device.
Implementation Method 1
optical lenses are arranged on upper portions of the LED light sources to heighten diffusibility of light emitted from the LED light sources
Implementation Method 2
a reflection adjustment pattern disposed on the insulating coating layer and having reflection characteristics that are different from reflection characteristics of the insulating coating layer
Data Source
AI summary
A light source module includes a printed circuit board including a wiring layer, an insulating coating layer disposed on the wiring layer, and a reflection adjustment pattern disposed on the insulating coating layer and having reflection characteristics which are different from reflection characteristics of the insulating coating layer, a light emitting chip mounted on the printed circuit board, and an optical lens arranged on an upper portion of the light emitting chip and fixed to the printed circuit board.