Cholesteric LCD Module With Scattering Layer for Wider Viewing Angles
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Solution Overview
Problem
Existing liquid crystal displays emit high-energy blue light that can damage retinas and cause visual fatigue, and they have limited viewing angles and poor display performance due to specular reflection and narrow viewing angles.
Innovation Solution
Incorporating a cholesteric liquid crystal layer with a conical helix texture and a light scattering layer to control light reflection and scattering, allowing for color display without color filters and enhancing viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional liquid crystal display is used, then display function is achieved, but blue light damage to eyes occurs and viewing angle is limited
Solution Approach 1:
The patent changes the optical parameters of the liquid crystal layer by using cholesteric liquid crystal with a specific helical pitch (380-480nm) that selectively reflects blue light while transmitting other wavelengths, thereby reducing blue light damage while maintaining display performance and expanding viewing angle
Solution Approach 2:
The patent converts the harmful blue light reflection property of cholesteric liquid crystal into a beneficial feature by designing the helical pitch to match the blue light wavelength, causing the blue light to be reflected away from the viewer's eyes while other visible light passes through for normal display function
2Illumination intensity
If specular reflection is used for light output, then display brightness is achieved, but viewing angle is narrow and display performance is poor
Solution Approach 1:
The patent transitions from specular reflection (one-dimensional light output) to diffuse reflection by introducing a scattering layer, enabling light to be emitted in multiple directions simultaneously, thereby expanding the viewing angle while maintaining display brightness
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 reduces blue light damage and improves display performance by enlarging viewing angles and achieving uniform brightness across different viewing positions, enhancing the display effect.
Implementation Method 1
the cholesteric liquid crystal is configured to have a conical helix texture when an electric field is applied, to reflect light matched with a helical pitch of the conical helix texture
Implementation Method 2
the light scattering layer is located on a side of the liquid crystal display panel and is configured to be able to scatter light reflected by the liquid crystal display panel
Implementation Method 3
the polymer dispersed liquid crystal is configured to switch between a scattering state and a transmission state in response to control of an electric field
Data Source
AI summary
Embodiments of the present disclosure provide a display module and a preparation method therefor, and a display apparatus. The display module includes a liquid crystal display panel and a light scattering layer. Among them, the liquid crystal display panel includes a first substrate, a second substrate, and a first liquid crystal layer, the first substrate is disposed opposite to the second substrate, the first liquid crystal layer is located between the first substrate and the second substrate, and the first liquid crystal layer includes a cholesteric liquid crystal configured to have a conical helix texture when an electric field is applied, to reflect light matched with a helical pitch of the conical helix texture; and the light scattering layer is disposed on a side of the liquid crystal display panel and is configured to scatter light reflected by the liquid crystal display panel.