Viewing Angle Adjusting Component for Display Backlight Uniformity
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Solution Overview
Problem
Conventional display devices with transparent backlight modules suffer from uneven viewing angles in under-screen sensor technology, leading to poor display effects.
Innovation Solution
A display device incorporating a viewing angle adjusting component with a switchable optical element and a liquid crystal dye layer that alternates between a fog and transparent state, adjusting the exit angle of backlight and allowing external light to reach sensors, thereby improving uniformity and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent backlight module is used to provide backlight for the sensor area under the screen, then the light can reach the sensor area, but light diverges severely causing brightness to be dark and viewing angles to be uneven
Solution Approach 1:
The patent applies a liquid crystal optical element that can dynamically switch between transparent and foggy states. When transparent, light passes through to illuminate the sensor area; when foggy, the liquid crystal disperses light to improve viewing angle uniformity. This dynamic state change allows the system to optimize for different operational requirements.
Solution Approach 2:
The patent changes the optical parameters of the backlight module by introducing a liquid crystal layer that can alter its light transmission and scattering properties. By controlling the liquid crystal's molecular orientation through voltage application, the system changes from a purely transparent state to a state with controlled light scattering, thereby adjusting viewing angle characteristics while maintaining sensor area illumination.
2Device complexity
If a transparent backlight module is used, then the structure is simple, but viewing angle uniformity deteriorates
Solution Approach 1:
The patent modifies the optical parameters of the existing transparent backlight module by integrating a liquid crystal layer. This layer can change its refractive index and light scattering properties through electrical control, thereby improving viewing angle uniformity without fundamentally redesigning the entire backlight structure.
Solution Approach 2:
The patent creates a composite backlight structure by combining the transparent backlight module with a liquid crystal optical element. This composite structure leverages the transparency of the original module while adding the light-scattering capabilities of the liquid crystal layer, achieving both simplicity and viewing angle uniformity.
3Ease of operation
If the optical element switches to fog state to improve viewing angle uniformity, then light scattering increases, but light transmission to sensor area decreases
Solution Approach 1:
The system dynamically switches the liquid crystal optical element between transparent and foggy states based on operational requirements. During sensor reading operations, the element remains transparent to maximize light transmission. During display operations, it switches to foggy state to improve viewing angle uniformity, thus resolving the contradiction through temporal separation of functions.
Solution Approach 2:
The liquid crystal optical element periodically switches between transparent and foggy states according to the display device's operational mode. This periodic switching allows the system to optimize light transmission during sensor operations and viewing angle uniformity during display operations, effectively managing the trade-off between these two parameters.
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 uniformity of backlight viewing angles and improves display effects without affecting the functionality of light sensors, addressing the issue of uneven angles caused by conventional transparent backlight modules.
Implementation Method 1
the liquid crystal dye layer comprises liquid crystal molecules and dye molecules; when the optical element is in the fog state, a longitudinal axis of the liquid crystal molecules in plurality of dimming structures are perpendicular to the first substrate; and when the optical element is in the transparent state, the longitudinal axis of the liquid crystal molecules in plurality of the dimming structures are parallel to the first substrate
Implementation Method 2
the optical element is configured to switch between a fog state and a transparent state; when the optical element is in the fog state, the viewing angle adjusting component is configured to adjust the exit angle of the backlight passing through the viewing angle adjusting component
Implementation Method 3
when the optical element is in the transparent state, external light enters the light sensor through the viewing angle adjusting component and the first backlight module, and the light sensor functions
Data Source
AI summary
A display device provided includes a display panel, a first backlight module, a second backlight module, a light sensor, and a viewing angle adjusting component. The first backlight module includes an optical element, and the viewing angle adjusting component is disposed corresponding to a display sensing area. When the optical element is in a fog state, the viewing angle adjusting component reduces an exit angle of backlight. When the optical element is in a transparent state, external light enters the light sensor through the viewing angle adjusting component and the first backlight module, which improves uniformity of backlight viewing angle.