Adjustable Diffusion Sheet for Under-Screen Optical Sensors
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Solution Overview
Problem
Traditional liquid crystal display panels with backlight plates cause barriers and scattering of external light, reducing the light transmittance rate and limiting the functionality of under-screen optical sensors, which in turn reduces the screen-to-body ratio in electronic equipment.
Innovation Solution
A liquid crystal display device with a backlight plate featuring a via hole and an adjustable diffusion sheet, comprising substrates with electrodes and adjustable transparency materials, allows for improved light transmittance by switching between transparent and fog states to optimize light transmission for optical sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a traditional backlight plate is used in the liquid crystal display panel, then the display function is achieved, but the light transmittance rate is reduced due to barrier and scattering effects
Solution Approach 1:
The backlight plate is segmented by introducing via holes that penetrate through it, dividing the continuous backlight structure into regions that allow selective light transmission. This segmentation enables external light to pass through specific areas (light transmissive region) while maintaining backlight illumination in display areas, thereby resolving the contradiction between display function and light transmittance.
Solution Approach 2:
An adjustable diffusion sheet is introduced as an intermediary component between the backlight plate and the liquid crystal display panel. This diffusion sheet can dynamically adjust its light diffusion properties to control the balance between backlight scattering (needed for display) and external light transmission (needed for sensor operation), effectively mediating the contradiction between these two opposing requirements.
2Reliability
If the optical sensor is disposed in the non-display region, then the optical sensor can operate, but the screen-to-body ratio is reduced
Solution Approach 1:
The light transmissive region is designed to serve multiple functions: it acts as part of the display panel structure while simultaneously serving as a passage for external light to reach the optical sensor. By making this region multi-functional, the optical sensor can be positioned beneath the display area rather than in a separate non-display region, thereby maintaining screen-to-body ratio while ensuring sensor operation.
3Illumination intensity
If the adjustable diffusion sheet is added to improve light transmittance, then the light transmittance rate is improved, but the device complexity increases
Solution Approach 1:
The diffusion sheet is designed with adjustable diffusion capability, allowing it to dynamically change its light diffusion properties based on operational requirements. This dynamic adjustment mechanism enables the system to optimize light transmittance for optical sensor operation while maintaining display performance, adding functionality without permanently increasing structural 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
The solution enhances the light transmittance rate through the light transmissive region, enabling the use of under-screen optical sensors and improving the screen-to-body ratio while providing uniform light intensity and wider viewing angles.
Implementation Method 1
a first adjustable transparency material disposed between the first electrode and the second electrode, wherein when the light transmissive region is in a transparent state, the first sub-section is in a transparent state, when the light transmissive region is in a display state, the first sub-section is in a fog state
Implementation Method 2
an adjustable diffusion sheet configured to improve a light transmissive rate of the light transmissive region
Data Source
AI summary
A liquid crystal display device and an electronic equipment are provided. The liquid crystal display device includes a liquid crystal display panel and an adjustable diffusion sheet configured to improve a light transmissive rate of a light transmissive region. The adjustable diffusion sheet includes a first sub-section corresponding to the position of the light transmissive region. When the light transmissive region is in a transparent state, the first sub-section is in a transparent state. When the light transmissive region is in a display state, the first sub-section is in a fog state.