Liquid Crystal Prism Display Device Without Polarizers
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Solution Overview
Problem
Conventional liquid crystal display devices require polarizer sheets on both substrates to modulate light polarization for grayscale display, limiting their ability to display different states without cooperative polarizer sheets.
Innovation Solution
A display device with a liquid crystal prism between substrates, adjusting the deflection angle of light from a backlight source to achieve total reflection or exit, allowing for grayscale display without polarizer sheets by controlling the deflection angle using electrodes and voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polarizer sheets are provided on two substrates to modulate light polarization, then grayscale display is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent removes the polarizer sheets from the conventional liquid crystal display structure. Instead of using polarizer sheets to modulate light, the invention uses a liquid crystal layer between two transparent substrates where the liquid crystal molecules themselves control light transmission through their orientation changes, eliminating the need for polarizer sheets and simplifying the device structure
Solution Approach 2:
The liquid crystal layer serves multiple functions: it acts as both the display medium and the light modulation mechanism. By controlling the orientation of liquid crystal molecules through applied voltages, the same layer that provides the display function also controls light transmission without requiring separate polarizer components
2Illumination intensity
If polarizer sheets are used to modulate light, then light transmission control is achieved, but light loss increases
Solution Approach 1:
The patent converts the conventional approach of using polarizer sheets (which block unwanted polarizations and cause light loss) into a system where the liquid crystal molecules directly control light transmission. The liquid crystal layer modulates light by changing molecular orientation, allowing controlled transmission without the energy loss associated with polarizer absorption
3Adaptability or versatility
If conventional liquid crystal display structure with polarizer sheets is used, then grayscale display is achieved, but adaptability is limited
Solution Approach 1:
The patent employs a dynamic liquid crystal layer that can change its molecular orientation continuously in response to applied voltages. This dynamic control allows the display to achieve various gray levels and states by adjusting the voltage, providing greater adaptability without adding structural complexity. The liquid crystal molecules can be oriented in different directions to control light transmission dynamically
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 the display device to exhibit different states, including bright, dark, and grayscale, by regulating the deflection angle of light, eliminating the need for polarizer sheets and enhancing display flexibility.
Implementation Method 1
the liquid crystal prism is configured to adjust a deflection angle of the light emitted from the backlight source traveling between the first substrate and the second substrate such that the light emitted from the backlight source is totally-reflected at a light exit face of the display device or exits from the light exit face of the display device
Implementation Method 2
the liquid crystal prism is configured to adjust a deflection angle of the light
Implementation Method 3
the liquid crystal is used to modulate polarization of a linearly polarized light to change the polarization orientation of the linearly polarized light
Data Source
AI summary
A display device and a display method using the same are disclosed. The display device includes: a display panel including a first substrate, a second substrate and a liquid crystal prism arranged between the first substrate and the second substrate; and a backlight source configured to emit a light which is incident onto the second substrate at an oblique angle; wherein the liquid crystal prism is configured to adjust a deflection angle of the light emitted from the backlight source traveling between the first substrate and the second substrate such that the light emitted from the backlight source is totally-reflected at a light exit face of the display device or exits from the light exit face of the display device.