Quantum Rod Display Device Polarization Control
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Solution Overview
Problem
Liquid crystal display devices experience light loss due to the presence of a lower polarizer and color filter, which affects the transmission of light from the backlight unit.
Innovation Solution
A display device configuration that omits the lower polarizer and color filter, utilizing a quantum rod layer between the thin film transistor array panel and the upper panel, where the arrangement direction of quantum rods is controlled by an electric field to polarize light, and a polarizer is used to control the transmission of polarized light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a lower polarizer and color filter are included in the display device, then the display can achieve proper color rendering and polarization control, but light loss occurs as light passes through these components
Solution Approach 1:
The patent extracts and removes the lower polarizer and color filter from the traditional display structure. Instead of having these components, the invention uses a quantum dot layer that directly converts backlight to colored light with inherent polarization properties, eliminating the need for separate polarizing and color filtering components at the bottom of the display stack.
Solution Approach 2:
The quantum dot layer serves multiple functions simultaneously: it acts as both the color generation mechanism and the polarization control element. By using quantum dots with specific orientations, the layer provides both wavelength conversion and polarization control in a single component, replacing what traditionally required multiple separate components.
2Device complexity
If a quantum rod layer is used to control light polarization, then the number of components is reduced and light loss is minimized, but the arrangement direction of quantum rods must be precisely controlled by electric field
Solution Approach 1:
The patent employs dynamic control of quantum rod orientation through applied electric fields. Rather than fixing the orientation during manufacturing, the system allows real-time adjustment of the quantum rod arrangement direction by controlling the electric field orientation, enabling dynamic adaptation to different display requirements.
Solution Approach 2:
The invention changes the orientation parameter of quantum rods by modifying the electric field parameters (direction and magnitude). By adjusting the electric field applied to the quantum dot layer, the orientation of quantum rods can be precisely controlled to achieve the desired polarization state without requiring complex manufacturing precision.
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 reduces light loss by optimizing the polarization and transmission of light, enhancing the display's efficiency and image expression without the need for additional polarizing components.
Implementation Method 1
The arrangement direction of the quantum rods is controlled by an electric field generated by the pixel electrode and the common electrode, wherein light is polarized according to the controlled arrangement direction
Implementation Method 2
an electric field generated by the pixel electrode and the common electrode
Implementation Method 3
The polarizer is configured to control the transmission degree of the polarized light from the quantum rods according to the arrangement direction of the quantum rods
Data Source
AI summary
A display device includes a light source generating light and a thin film transistor array panel including a pixel electrode and a common electrode. The display includes an upper panel and a quantum rod layer positioned between the thin film transistor array panel and the upper panel. The display includes an upper polarizer attached outside of the upper panel, in which the quantum rod layer includes quantum rods, and an arrangement direction of the quantum rods is controlled by an electric field generated by the pixel electrode and the common electrode, light is polarized according to the controlled arrangement direction, and the polarizer controls the transmission degree of the polarized light from the quantum rods according to the arrangement direction of the quantum rods.