Light Valve Display Module for Switchable Privacy Viewing
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Solution Overview
Problem
Current display panels with wide viewing angles pose privacy concerns due to potential privacy leakage, and anti-peeping films reduce brightness and hinder mode switching between anti-peeping and wide viewing modes.
Innovation Solution
A display module with a light valve regulator comprising first and second viewing angle control layers, controlled by regulating electrodes, allows switching between anti-peeping and wide viewing modes by rotating liquid crystal molecules to adjust light emission ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an anti-peeping film is added to the display screen to achieve viewing angle convergence, then privacy protection is improved, but display brightness decreases resulting in poor display effect
Solution Approach 1:
The patent applies a liquid crystal layer that can dynamically change its optical properties between two states: a first state where liquid crystal molecules are oriented to allow wide viewing angles and light passage, and a second state where molecules are reoriented to converge viewing angles and prevent peeping. This dynamic switching capability allows the display to adapt between privacy protection mode and normal viewing mode, resolving the contradiction between privacy protection and display brightness.
2Object-affected harmful factors
If an anti-peeping film is used to converge viewing angle, then privacy protection is improved, but mode switching between anti-peeping and wide viewing angle modes is hindered
Solution Approach 1:
The liquid crystal layer provides dynamic reconfigurability, allowing the display to switch between anti-peeping mode and wide viewing angle mode on demand. This eliminates the fixed functionality of traditional anti-peeping films and enables adaptability for different usage scenarios.
Solution Approach 2:
The patent changes the orientation parameter of liquid crystal molecules between two states to achieve mode switching. By controlling the molecular orientation through electric field application, the display can transition between privacy protection mode and normal viewing mode, enhancing adaptability.
3Area of stationary object
If liquid crystal molecules are rotated to enable wide viewing angle mode, then viewing angle is improved, but device complexity increases due to additional control layers
Solution Approach 1:
The liquid crystal layer serves multiple functions: it acts as both the viewing angle control mechanism and the light modulation element. By integrating these functions into a single component rather than adding separate layers, the patent achieves wide viewing angle capability while minimizing 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
Enables seamless switching between anti-peeping and wide viewing modes, maintaining brightness and user privacy, enhancing user experience by accommodating different viewing needs.
Implementation Method 1
the liquid crystal molecules in the first liquid crystal layer of the first viewing angle control layer and in the second liquid crystal layer of the second viewing angle control layer are rotated
Implementation Method 2
The second regulating electrode and the first regulating electrode form an electric field for controlling the first liquid crystal layer and the second liquid crystal layer
Implementation Method 3
An absorption axis of the upper polarizer is not equal to an absorption axis of the lower polarizer. The first polarizer is disposed on a side of the second regulating electrode facing away from the second viewing angle control layer. An absorption axis of the first polarizer is the same as the absorption axis of the upper polarizer
Implementation Method 4
The first viewing angle control layer includes a light focusing layer and a first liquid crystal layer that are alternately arranged. The transparent substrate focuses the light perpendicularly incident on the light focusing layer to the opening to exit
Data Source
AI summary
A display module, a driving method, and a display device are disclosed. The display module includes a display panel, a backlight module, and a light valve regulator. The light valve regulator includes a first regulating electrode, a first viewing angle control layer arranged on a side of the first regulating electrode facing away from the display panel, a second viewing angle control layer arranged on a side of the first viewing angle control layer facing away from the first regulating electrode, a second regulating electrode, and a first polarizer. The second and first regulating electrode are operative to form an electric field for controlling the first and the second liquid crystal layer. The first polarizer is disposed on a side of the second regulating electrode facing away from the second viewing angle control layer. An absorption axis of the first polarizer is identical with that of the upper polarizer.