Liquid Crystal Display Panel Peep Prevention via Optical Compensation
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Solution Overview
Problem
The complexity of structure and preparation process in existing dark-state peep prevention display devices, which are formed by superimposing a dimming liquid crystal panel on a display panel, hinders their practical application.
Innovation Solution
A liquid crystal display panel comprising a first and second polarizer with a liquid crystal layer in between, along with first and second optical compensation films, where the optical axes of the compensation films are perpendicular and have equal in-plane retardation, enhancing peep prevention by controlling light transmission and polarization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a dimming liquid crystal panel is superimposed on a display panel to achieve dark-state peep prevention, then peep prevention effect is improved, but device structure and preparation process become complex
Solution Approach 1:
The patent merges the display function and dimming function into a single liquid crystal display panel. The liquid crystal layer serves dual purposes: displaying images when voltage is applied and preventing peeping when voltage is not applied. This eliminates the need for a separate dimming liquid crystal panel, thereby simplifying the overall device structure and preparation process while maintaining effective peep prevention.
2Manufacturing precision
If optical compensation films are added to improve display quality and peep prevention, then display performance is improved, but device structure becomes more complex
Solution Approach 1:
The optical compensation films in the patent serve multiple functions simultaneously. They compensate for optical phase differences to improve display quality, control light transmission angles to enhance peep prevention effect, and work together with the liquid crystal layer to achieve both display and dimming functions. This multi-functionality reduces the need for additional separate components, thereby managing structural complexity while improving performance.
3Object-affected harmful factors
If liquid crystal molecules are oriented parallel to initial direction when not powered on, then dark-state peep prevention is achieved, but light transmission is reduced
Solution Approach 1:
The liquid crystal molecules dynamically change their orientation based on the applied voltage. When voltage is not applied, the molecules orient parallel to the initial direction, blocking light transmission to prevent peeping. When voltage is applied, the molecules reorient to allow light transmission for normal display. This dynamic switching capability enables the system to achieve both peep prevention and adequate light transmission at different operational states.
Solution Approach 2:
The patent utilizes changes in the optical parameters of the liquid crystal layer by applying different voltages. By changing the voltage parameter, the orientation of liquid crystal molecules changes, which in turn changes the light transmission parameter. This allows the system to switch between high light transmission (display mode) and low light transmission (peep prevention mode) effectively.
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
This configuration effectively reduces light intensity at sideways viewing angles, providing a better peep prevention effect while maintaining normal display quality, with improved brightness and transmittance compared to traditional dark-state peep prevention display devices.
Implementation Method 1
a liquid crystal layer disposed between the first polarizer and the second polarizer, the liquid crystal layer comprising liquid crystal molecules whose optical axes are all parallel to an initial direction in the case where the liquid crystal display panel is not powered on
Implementation Method 2
a first optical compensation film disposed between the first polarizer and the second polarizer; wherein an optical axis of the first optical compensation film is parallel to a plane where the first optical compensation film is in
Data Source
AI summary
Embodiments of the present disclosure provide a liquid crystal display panel and a display device. The panel comprises a first and second polarizers, a liquid crystal layer, a first and second optical compensation films. The liquid crystal layer is disposed between the opposite first and second polarizers; the first optical compensation film is located between the first polarizer and the liquid crystal layer, and an optical axis of the first optical compensation film is parallel to a plane where the first optical compensation film is in; and the second optical compensation film is located between the first and second polarizers, an optical axis of the second optical compensation film is parallel to a plane where the second optical compensation film is in and perpendicular to the optical axis of the first optical compensation film, and in-plane retardations of the first and second optical compensation films are equal.