LED PCB Reflection Layer and Extended Plate for Thin LCD Backlight
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Solution Overview
Problem
Existing LCD devices face challenges in achieving a thinner, cost-effective, and high-luminance display due to limitations in the thickness of components, optical efficiency, and mechanical reliability, particularly with the use of CCFL backlights, which also pose environmental hazards.
Innovation Solution
The implementation of an LED backlight configuration that omits the LED housing reflector, incorporates a reflection layer on the LED PCB, and extends the reflection plate to cover the LED array, enhancing light reflection efficiency and reducing production costs while adhering to environmental regulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a side type backlight with lamps is used, then light can be supplied to the liquid crystal panel, but the device thickness increases and the structure becomes complex
Solution Approach 1:
The patent combines the LED array, reflection plate, and light guide plate into an integrated backlight unit that directly interfaces with the liquid crystal panel, eliminating the need for separate housing reflectors and reducing overall structural complexity while maintaining effective light supply
2Illumination intensity
If CCFL backlights are used, then light emission is achieved, but environmental harm is caused and color reproduction is poor
Solution Approach 1:
The patent replaces long-lived but harmful CCFL tubes with shorter-lived LED components that are environmentally friendly, allowing for easier disposal and recycling while eliminating mercury contamination risks
Solution Approach 2:
The patent changes the fundamental light generation parameter from fluorescent phosphor excitation (CCFL) to electroluminescence (LED), achieving superior color reproduction through direct blue LED emission combined with yellow phosphor conversion
3Length of moving object
If the LCD device is made thinner, then portability is improved, but production cost increases and manufacturing difficulty increases
Solution Approach 1:
The patent segments the backlight structure into modular components (LED array module, reflection plate module, light guide plate module) that can be manufactured separately and assembled efficiently, reducing overall thickness while simplifying production processes
Solution Approach 2:
The patent transitions from vertical stacking of thick components to a planar integration approach where the LED array is positioned at the edge and light is distributed through the light guide plate, achieving thinness in the Z-dimension without compromising manufacturing ease
4Object-affected harmful factors
If LED array is used instead of CCFL, then environmental compliance is improved and color reproduction is enhanced, but light reflection efficiency may be reduced without proper reflector
Solution Approach 1:
The reflection plate serves multiple functions simultaneously: it reflects LED light toward the light guide plate, provides structural support for the backlight unit, and acts as a thermal management component, thereby maintaining high light reflection efficiency while supporting the LED configuration
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 results in a thinner, lighter, and more cost-effective LCD device with improved reflection efficiency, reduced processing time, and increased production yield, effectively addressing the limitations of traditional backlight technologies.
Implementation Method 1
an LED array for supplying light to the liquid crystal panel
Implementation Method 2
a reflection plate formed between the LED array and a lower portion of a lower cover
Implementation Method 3
a light guide plate installed in a direction in which the LED outputs light, and guiding light
Implementation Method 4
liquid crystal of the liquid crystal layer is rotated due to dielectric anisotropy according to the electric field between the common electrode and the pixel electrodes
Data Source
AI summary
In a liquid crystal display (LCD) device, an LED PCB with the reflection layer formed on surface thereof is installed at an upper side of the LED array and a reflection plate extends such that it sufficiently covers the lower portion of the LED array to thus make light emitted from the light source incident to its maximum level, thus coping with the reduction in the quantity of light resulting from making the LCD device thinner. The LCD device includes: a liquid crystal panel; an LED array supplying light to the liquid crystal panel; a light guide plate installed in a direction in which the LED outputs light, and guiding light; a reflection plate formed between the LED array and a lower portion of a lower cover; and an LED PCB attached to an upper portion of the lower cover at an upper side of the LED array and having a reflection layer formed at a side facing the light guide plate. Because an existing LED housing reflector is removed, a cost and processing time can be reduced and an assembling process is simplified to improve a defective rate and production yield.