Backlight Module with Light Extracting Gratings for High Transmittance
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Solution Overview
Problem
Traditional LCD display technologies rely on complex polarizer systems and color filters, which limit brightness, increase thickness, and reduce transmittance, while also being inefficient in providing full-color displays.
Innovation Solution
A backlight module with a light guide plate, monochromatic light sources of different colors, an optical path adjusting portion, and light extracting gratings that allow light to be incident and extracted at specific angles, eliminating the need for upper and lower polarizers and color filters, and enabling improved light homogenization and transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional LCD display technology uses lower-side polarizer, color filter and upper-side polarizer, then basic display function is achieved, but brightness is limited and thickness is increased
Solution Approach 1:
The patent removes the upper-side polarizer and color filter from the traditional LCD structure. By using a backlight module that directly emits RGB colors and a liquid crystal layer that only performs grayscale modulation, the display achieves full-color capability without these components, thereby increasing brightness and reducing thickness
Solution Approach 2:
The patent separates the color generation function from the liquid crystal layer and assigns it to the backlight module with independent RGB light sources. The liquid crystal layer is then dedicated solely to grayscale modulation, creating a functional segmentation that improves overall display performance
2Illumination intensity
If traditional LCD display technology uses lower-side polarizer, color filter and upper-side polarizer, then basic display function is achieved, but transmittance is reduced
Solution Approach 1:
The patent eliminates the upper-side polarizer and color filter components that block and absorb light. By using a backlight module that directly provides RGB colors, the system achieves higher transmittance with a simpler optical path
Solution Approach 2:
Instead of using a white backlight with color filters to subtract colors, the patent inverts the approach by using direct RGB emission from the backlight module, allowing light to pass through with minimal obstruction
3Illumination intensity
If traditional LCD display technology uses color filter, then full-color display is achieved, but display resolution and efficiency are reduced
Solution Approach 1:
The patent removes the color filter layer entirely. By providing RGB colors directly from the backlight module, the display achieves full-color capability without the resolution-lowering effects of color filter substrates, thereby improving display resolution and efficiency
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 enhances display brightness, reduces thickness, and improves transmittance by allowing for full-color display without the need for color filters, increasing display resolution and efficiency.
Implementation Method 1
making light emitted by the monochromatic light sources of each color be incident to the light guide plate from the incident surface of the light guide plate at different incident angles, wherein the light incident to the light guide plate is propagated with a total reflection in the light guide plate
Implementation Method 2
a plurality of light extracting gratings arranged in an array, located on the light-exiting surface of the light guide plate, for extracting the light in the light guide plate with a same preset angle
Data Source
AI summary
Embodiments of the present disclosure provide backlight module, display device and driving method. The backlight module comprises: light guide plate for emitting light from light-exiting surface of the light guide plate along light-exiting direction; monochromatic light sources of different colors located on a side of the light guide plate on which incident surface is located; optical path adjusting portion located on the incident surface of the light guide plate, for making light emitted by the monochromatic light sources be incident to the light guide plate from the incident surface of the light guide plate at different incident angles, wherein the light incident to the light guide plate is propagated with a total reflection; and light extracting gratings arranged in an array, located on the light-exiting surface of the light guide plate, for extracting the light with same preset angle.