Backlight Module Light Extraction Devices for Display Brightness
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Solution Overview
Problem
Conventional liquid crystal display devices require multiple optical components like polarizers and color filters, which lead to energy loss and increased thickness, making them less efficient and bulkier.
Innovation Solution
A backlight module with a light source assembly emitting collimated light beams of different colors, guided by a light guiding plate with specific light incident and extraction devices, eliminating the need for additional optical components by directly extracting colored light beams perpendicular to the emergent surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional liquid crystal display devices use polarizers and color filters to convert light, then colored images can be displayed, but energy loss increases and device thickness increases
Solution Approach 1:
The patent extracts only the necessary optical components (removing polarizers and color filters) and uses a light guiding plate with light extraction devices that directly emit colored light beams, eliminating energy loss from light conversion while maintaining display brightness
Solution Approach 2:
The patent changes the light emission parameters by using a light guiding plate with specific light extraction devices that directly emit colored light in predetermined directions, replacing the traditional light conversion method and reducing energy loss
2Illumination intensity
If conventional liquid crystal display devices use polarizers and color filters, then colored images can be displayed, but device thickness increases
Solution Approach 1:
The patent removes unnecessary optical components (polarizers and color filters) from the display structure, keeping only the essential light guiding plate and light extraction devices, thereby reducing device thickness while maintaining display functionality
Solution Approach 2:
The patent uses a light guiding plate with light extraction devices that emit light in predetermined directions, changing the dimensional approach from multi-layer stacked components to a more compact structure with directed light emission
3Illumination intensity
If conventional liquid crystal display devices use multiple optical components, then colored light can be produced, but device complexity increases
Solution Approach 1:
The patent merges the functions of multiple optical components (polarizers, color filters, and light guiding) into a single integrated light guiding plate with light extraction devices, simplifying the overall device structure while maintaining colored light output capability
Solution Approach 2:
The light guiding plate serves multiple functions simultaneously: guiding light, extracting colored light in specific directions, and replacing the need for separate polarizer and color filter components, thereby reducing device 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 solution enables efficient colored light extraction without additional optical components, reducing energy loss and maintaining a thin form factor, thus enhancing display efficiency and compactness.
Implementation Method 1
a light guiding plate comprising: a plurality of light incident portions configured to receive the light beams of different colors, and a light emergent surface, wherein, a plurality of pixel backlight regions are provided on the light emergent surface
Implementation Method 2
an incidence angle of the light beam of the first color on the light emergent surface is greater than a critical angle of total reflection of the light beam of the first color from inside the light guiding plate towards the light emergent surface
Data Source
AI summary
A backlight module and a display device are provided in embodiments of the present disclosure. The backlight module includes: a light source assembly configured to emit light beams of different colors, the light beams of different colors comprising a light beam of a first color and a light beam of a second color; a light guiding plate comprising: a plurality of light incident portions configured to receive the light beams of different colors, and a light emergent surface, wherein, a plurality of pixel backlight regions are provided on the light emergent surface, each pixel backlight region includes a plurality of light extraction devices, and the plurality of light extraction devices include at least one first light extraction device configured to guide the light beam of the first color of the light beams of different colors from the plurality of light incident portions to exit from the light emergent surface, and at least one second light extraction device configured to guide the light beam of the second color of the light beams of different colors from the plurality of light incident portions to exit from the light emergent surface.