Liquid Crystal Display Device with Color Conversion and Emission Layer
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Solution Overview
Problem
Conventional liquid crystal display (LCD) devices experience significant brightness reductions and color shifts when viewed from angles other than normal, due to differences in light emission characteristics in lateral and normal directions.
Innovation Solution
Incorporating a color conversion member between the liquid crystal layer and a second polarizer, and an emission layer on the second polarizer that absorbs light and emits blue light, helping to maintain brightness and color consistency across various viewing angles by adjusting the light path and polarization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional LCD structure is used, then device complexity is low, but brightness and color consistency across viewing angles deteriorates
Solution Approach 1:
A color conversion member is introduced as an intermediary component between the liquid crystal layer and the second polarizer. This member converts light wavelengths to improve color consistency across viewing angles by adjusting the spectral composition of light passing through the display device.
Solution Approach 2:
The emission layer is configured to emit light with specific wavelength characteristics that differ from the absorbed light wavelength. By changing the wavelength parameter of the emitted light, the device compensates for color shifts observed at angled viewing positions.
2Manufacturing precision
If conventional LCD structure is used, then manufacturing simplicity is high, but color representation accuracy deteriorates
Solution Approach 1:
The emission layer is designed to emit light with specific wavelength characteristics that compensate for color shifts. By adjusting the emission wavelength parameter, the device maintains accurate color representation across different viewing angles.
Solution Approach 2:
The color conversion member acts as an intermediary that modifies the spectral composition of light. This component ensures accurate color representation by converting light wavelengths before they reach the second polarizer and viewer.
3Illumination intensity
If light path is adjusted to improve lateral brightness, then brightness uniformity improves, but polarization control complexity increases
Solution Approach 1:
The color conversion member serves as an intermediary that modifies light properties without directly affecting polarization control. This allows lateral brightness improvement while maintaining relatively simple polarization control mechanisms.
Solution Approach 2:
By changing the wavelength parameter of light through the emission layer and color conversion member, the device improves lateral brightness uniformity. This parameter change approach avoids complicating the polarization control system.
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 effectively reduces brightness loss and color shifts when viewed from different angles, ensuring consistent image quality and color representation.
Implementation Method 1
The emission layer is configured to absorb at least a portion of light passed through the color conversion member and the second polarizer, and to emit light corresponding to at least a blue wavelength
Implementation Method 2
The emission layer is configured to absorb at least a portion of light passed through the color conversion member and the second polarizer, and to emit light of a wavelength different from a wavelength of the absorbed light
Implementation Method 3
configured to apply an electric field to the LC layer to change the arrangement direction of LC molecules disposed in the LC layer
Implementation Method 4
Changing the arrangement direction enables an LCD device to change the polarization direction of incident light
Implementation Method 5
The color conversion member is disposed between the liquid crystal layer and the second polarizer
Data Source
AI summary
A display device includes: a first polarizer, a second polarizer, a liquid crystal layer, a color conversion member, an emission layer, and a first substrate. The second polarizer is disposed on the first polarizer. The liquid crystal layer is disposed between the first polarizer and the second polarizer. The color conversion member is disposed between the liquid crystal layer and the second polarizer. The emission layer is disposed on the second polarizer. The emission layer is configured to absorb at least a portion of light passed through the color conversion member and the second polarizer, and to emit light corresponding to at least a blue wavelength. The first substrate is disposed on the emission layer.