White LED Backlight Panel Reducing Thickness
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Solution Overview
Problem
Conventional backlight panels for LCDs are thick and costly due to the need for air layers and light mixing, leading to increased power consumption and heat generation, and require color sensors for LED compensation.
Innovation Solution
A backlight panel using white light emitting diodes with red and green phosphors, which emit uniform white light, reducing the need for air layers and light mixing, and allowing for enhanced luminance without the need for brightness enhancement films, thus minimizing thickness and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If red, green and blue LEDs are arranged in an LED array to enhance color reproducibility, then color reproduction is improved, but the backlight panel thickness increases due to the need for air layers and light mixing
Solution Approach 1:
The patent combines multiple LED types (red, green, blue LEDs) into a single integrated LED array structure, allowing all three primary colors to be generated in one location. This eliminates the need for separate light sources and air layers for mixing colors, thereby reducing backlight panel thickness while maintaining color reproduction quality
Solution Approach 2:
The patent introduces a light mixing layer as an intermediary component between the LED array and the display panel. This layer facilitates the mixing of red, green, and blue light without requiring thick air layers, enabling color uniformity while controlling overall panel thickness
2Manufacturing precision
If light shielding patterns are used to prevent direct light transmission from LEDs, then uniform light distribution is improved, but manufacturing complexity increases
Solution Approach 1:
The patent extracts the light shielding function from complex patterned structures and integrates it into the light mixing layer design. By incorporating light shielding capabilities directly into the mixing layer material or structure, the need for separate light shielding patterns is eliminated, simplifying manufacturing while maintaining uniform light distribution
Solution Approach 2:
The light mixing layer is designed to perform multiple functions simultaneously: it mixes red, green, and blue light for uniform color distribution, and also provides light shielding to prevent direct LED light transmission. This multi-functionality reduces the number of separate components needed, simplifying manufacturing
3Illumination intensity
If brightness enhancement films are used to increase LCD panel luminance, then luminance is improved, but the backlight panel thickness increases
Solution Approach 1:
The patent merges the light mixing function and light shielding function into a single integrated light mixing layer, eliminating the need for separate brightness enhancement films. This integration achieves uniform light distribution and prevents direct light transmission while controlling overall panel thickness
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 results in a thinner, more cost-effective backlight panel with improved luminance and simplified operation, as the white LEDs have similar lifespan and degradation characteristics, reducing the necessity for color sensors and power consumption.
Implementation Method 1
Each of the white light emitting diodes includes a blue light emitting diode chip and red and green phosphors positioned over the blue light emitting diode chip
Implementation Method 2
red and green phosphors positioned over the blue light emitting diode chip to convert a portion of blue light into green and red light, respectively
Data Source
AI summary
Disclosed is a backlight panel employing a white light emitting diode. The white light emitting diode includes a blue light emitting diode chip and red and green phosphors positioned over the blue light emitting diode chip. Accordingly, since the backlighting can be performed using white light with distinct red, green and blue wavelengths, the color reproducibility can be enhanced. Further, since the white light can be implemented with a single light emitting diode, the manufacturing costs and thickness of the backlight panel can also be reduced.