Switchable Backlight Module for Full-Screen Displays
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Solution Overview
Problem
Conventional liquid crystal display screens are opaque to light, disrupting the integrity of full screen displays and increasing the risk of cellphone damage and repair costs due to the need for notches or pop-up mechanisms for optical components like cameras and fingerprint readers.
Innovation Solution
A backlight module with adjustable transparent panels and light-emitting diode light strips that switch between backlight and transparent states, using indium tin oxide electrodes and light-scattering materials to change the light path and allow for uniform plane light sources or transparent transmission, enabling optical components to function without disrupting the full screen display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional liquid crystal display screens are made opaque to light, then the display function is achieved, but the integrity of full screen display is disrupted and optical components cannot function
Solution Approach 1:
The backlight module employs a switchable transparent panel that can dynamically change its optical properties between transparent and opaque states through voltage control of the indium tin oxide electrodes, allowing the system to adapt between different functional requirements (optical component operation vs. normal display)
Solution Approach 2:
The invention changes the optical parameter (transparency) of the backlight module by applying different voltages to the indium tin oxide electrodes, which alters the refractive index and light scattering properties of the material, enabling transition between transparent and opaque states
2Adaptability or versatility
If notches or openings are reserved on the screen for optical components, then optical components can be integrated, but the full screen display integrity is disrupted
Solution Approach 1:
The backlight module serves multiple functions: it provides backlight illumination for the display and simultaneously acts as a transparent window for optical components when needed, eliminating the need for separate openings or notches in the display structure
3Adaptability or versatility
If pop-up mechanisms are used for optical components, then optical components can access the front surface, but mechanical structures are introduced that reduce internal space and increase damage risk
Solution Approach 1:
The invention replaces mechanical pop-up mechanisms with an electro-optical solution where the backlight module's transparency is controlled by electrical voltage applied to indium tin oxide electrodes, eliminating moving parts and mechanical complexity
4Reliability
If the backlight module is made transparent, then optical components can function, but the backlight cannot provide uniform illumination
Solution Approach 1:
The light scattering layer is positioned only in the regions where backlight illumination is needed, while other regions remain transparent for optical component operation, allowing different parts of the backlight module to have different optical properties simultaneously
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
Enables normal operation of optical components while maintaining the integrity of the full screen display, reducing the risk of cellphone damage and repair costs by eliminating the need for notches or pop-up mechanisms, and allowing for true mechanical-structure-free liquid crystal full screen displays.
Implementation Method 1
light-scattering material in the light-scattering material layer is excited, and scatters light emitted by the light emitting diode light strip towards the adjustable transparent panel, so as to change the path of the light
Implementation Method 2
when a second voltage is applied to the indium tin oxide electrodes, the light-scattering material in the light-scattering material layer is not excited, the adjustable transparent panel is in the transparent state, and light from outside of the adjustable transparent panel is transmitted through the adjustable transparent panel
Data Source
AI summary
In a backlight module, a liquid crystal display screen, and a using method thereof provided, the liquid crystal display screen includes a liquid crystal display panel, a backlight module switchable between a transparent state and a backlight state, and an optical component. Without disrupting full screen display and increasing a possibility of cellphone damages, the backlight module may solve a problem that the liquid crystal display screen is opaque to light, such that the screen is normally displayed, and the optical component is operated on the same liquid crystal display screen.