LED Array Layout for LCD Backlight Color Uniformity
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Solution Overview
Problem
The existing LCD devices suffer from an inferior color split phenomenon at the outer and edge portions of the light guide plate due to the spacing between the light guide plate and the LED array, leading to incomplete white light emission and increased power consumption, which complicates the device structure and fabrication.
Innovation Solution
The LCD device design ensures that the lateral surfaces of the LEDs at both ends of the array are consistent with the light guide plate's surfaces, with their light emission surfaces positioned close to the light incidence surface, allowing for overlap or sufficient distance for optimal light incidence, thereby eliminating the color split issue and enhancing light efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the LED array is spaced apart from the light guide plate, then the device structure is simplified, but color split phenomenon occurs at the outer and edge portions of the light guide plate
Solution Approach 1:
The patent applies local quality by differentiating the arrangement of LEDs at different positions. Specifically, blue LEDs are arranged at the outer ends of the light guide plate while red and green LEDs are positioned at inner portions, creating localized color distribution that compensates for the color split phenomenon at edges while maintaining overall color balance across the display area.
2Ease of manufacture
If the LED array is spaced apart from the light guide plate, then assembly is easier, but white light emission becomes incomplete and power consumption increases
Solution Approach 1:
The patent employs parameter changes by optimizing the spatial arrangement parameters of LEDs relative to the light guide plate. The specific positioning of blue LEDs at outer ends and red/green LEDs at inner portions creates optimal light mixing conditions that improve white light emission efficiency, thereby reducing the total power consumption of the backlight unit.
3Device complexity
If the LED array is spaced apart from the light guide plate, then the structure is simpler, but non-mixed color regions appear and screen quality deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the arrangement of LEDs at different positions. Specifically, blue LEDs are arranged at the outer ends of the light guide plate while red and green LEDs are positioned at inner portions, creating localized color distribution that compensates for the color split phenomenon at edges while maintaining overall color balance across the display area.
Solution Approach 2:
The patent utilizes dimensional arrangement by positioning LEDs not only along the length of the light guide plate but also considering their lateral positions. This two-dimensional arrangement strategy ensures that light from different color LEDs mixes properly before entering the light guide plate, eliminating non-mixed color regions and improving screen quality without increasing structural 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 configuration ensures uniform light emission, maintains the brightness ratio for white light across the light guide plate, removes the non-mixed color regions, and simplifies the device structure by eliminating the need for additional connectors and complex PCB arrangements, resulting in improved screen quality and reduced power consumption.
Implementation Method 1
a light source may be implemented as an Electro Luminescence (EL), a Light Emitting Diode (LED)
Implementation Method 2
The light source may be implemented as an Electro Luminescence (EL)
Data Source
AI summary
A LCD device according to an embodiment of the present invention includes a LCD panel including liquid crystal, and a backlight unit including a light emitting diode (LED) array including a plurality of LEDs, the plurality of LEDs having a peripheral LED disposed at a peripheral end of the LED array, and a light guide plate disposed below the LCD panel, each LED having a light emission surface to emit light to a light incidence surface of the light guide plate. The emission surface of the peripheral LED completely covers a peripheral end of the light incidence surface, the peripheral end of the light incidence surface being an area adjacent to a lateral surface of the light guide plate.