Backlight Module Using Polymer Network Liquid Crystal for Transmittance Regulation
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Solution Overview
Problem
Conventional backlight modules with miniature light-emitting diodes (mini-LEDs) face challenges in structural stability and thickness due to the need for large optical distances and non-continuous diffusion plate thicknesses, which complicates module design and increases overall thickness.
Innovation Solution
A novel backlight module design featuring a polymer network liquid crystal (PNLC) layer with adjustable transmittance, allowing for a continuously adjustable optical distance between the light source and film, achieved through a multilayered or single-layered structure with patterned surfaces and transparent electrodes, enabling flexible shielding without altering the optical distance or module thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a large optical distance is used to shield light shadows of LEDs with large pitches, then light shadow shielding is improved, but module structural stability deteriorates and overall thickness increases
Solution Approach 1:
The patent changes the optical parameters of the PNLC film by adjusting its thickness to achieve different transmittance levels. By varying the film thickness, the system can shield light shadows effectively without requiring a large optical distance, thus maintaining structural stability and reducing module thickness
Solution Approach 2:
The patent transitions from adjusting the optical distance (one-dimensional spatial parameter) to adjusting the PNLC film thickness (another dimensional parameter) to achieve light shadow shielding. This dimensional change allows for compact module design while maintaining shielding effectiveness
2Object-affected harmful factors
If a large optical distance is used to shield light shadows of LEDs with large pitches, then light shadow shielding is improved, but overall thickness increases
Solution Approach 1:
The patent uses parameter changes in the PNLC film thickness to control transmittance and achieve light shadow shielding without increasing the overall module thickness. The film thickness can be precisely adjusted to provide the required shielding while maintaining a compact form factor
Solution Approach 2:
The patent shifts from increasing optical distance (length parameter) to adjusting film thickness (another length parameter in a different dimension) to achieve shielding. This allows effective shielding without proportionally increasing the overall module thickness
3Adaptability or versatility
If the pitches between light emitting diodes are different, then lighting flexibility is improved, but optical distance adjustment complexity increases
Solution Approach 1:
The patent uses parameter changes in the PNLC film thickness to provide adaptability to different LED pitches. By adjusting the film thickness, the system can accommodate various pitch configurations without requiring changes to the optical distance or module structure, thereby reducing 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 reduces the overall thickness of the display module, enhances structural stability, and allows for adjustable shielding by regulating the transmittance of the PNLC film, resulting in a more compact and stable backlight module.
Implementation Method 1
polymer network liquid crystal (PNLC) layer with adjustable transmittance
Implementation Method 2
patterned upper surface and/or a patterned lower surface corresponding to the plurality of miniature light emitting diodes
Data Source
AI summary
The present invention provides a backlight module and a method of regulating transmittance thereof. The backlight module includes: a substrate; a plurality of miniature light emitting diodes (mini-LEDs) disposed on the substrate at intervals; a polymer network liquid crystal layer disposed above the plurality of mini-LEDs, wherein the polymer network liquid crystal layer is a multilayered structure or a single-layered structure; and an optical functional layer disposed above the polymer network liquid crystal layer.