Liquid Crystal Display Module Light Concentration
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Solution Overview
Problem
Current liquid crystal display devices face challenges in achieving high contrast and transmittance without increasing the open area ratio, particularly due to the use of in-cell polarizing plates and quantum-dot phosphors, which result in decreased transmittance and increased cadmium usage.
Innovation Solution
A liquid crystal display module with a color display section that includes a blocking region and a light-emitting region, where the liquid crystal layer switches between a blocking state and a displaying state by changing the orientation of liquid crystal molecules in response to applied voltage, allowing light to be concentrated either to the blocking region or the light-emitting region, thus optimizing light usage and reducing cadmium usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If in-cell polarizing plates are used to control light transmission, then the liquid crystal display device can achieve basic display functionality, but the transmittance decreases by not less than 50%
Solution Approach 1:
The patent removes the in-cell polarizing plate from the liquid crystal display structure. By extracting this component that causes 50% transmittance loss, the invention achieves high transmittance without compromising display functionality, as the display operates effectively without the polarizing plate's light-blocking mechanism
Solution Approach 2:
The patent converts the harmful effect of light absorption by polarizing plates into a benefit by eliminating the need for polarizing plates entirely. The display device achieves high transmittance by using a structure that does not require polarizing plates, thereby turning the transmittance problem into a solution
2Illumination intensity
If the open area ratio of the wavelength conversion layer is increased to improve transmittance, then more light passes through, but the contrast decreases due to light leakage
Solution Approach 1:
The patent divides the display area into distinct light-emitting regions and non-light-emitting regions. This segmentation allows precise control over where light is emitted, enabling high transmittance in light-emitting areas while maintaining high contrast through effective light blocking in non-emitting areas, preventing light leakage between segments
Solution Approach 2:
The patent applies different properties to different regions: light-emitting regions have high transmittance for maximum light output, while non-light-emitting regions have light-blocking properties for high contrast. This local differentiation of optical properties resolves the contradiction between overall transmittance and local contrast
3Use of energy by moving object
If quantum-dot phosphor is used for wavelength conversion, then high wavelength conversion efficiency is achieved, but the amount of cadmium increases with increased open area ratio
Solution Approach 1:
The patent uses quantum-dot phosphor selectively only in light-emitting regions rather than uniformly across the entire display area. This partial application maintains high wavelength conversion efficiency where needed while significantly reducing the total amount of cadmium used, as the phosphor is concentrated only in areas where light emission is required
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 enables both high contrast and high transmittance without increasing the open area ratio, eliminating the need for in-cell polarizing plates and reducing cadmium usage, while maintaining efficient light usage and wide color reproduction.
Implementation Method 1
the liquid crystal layer being switchable between a blocking state and a displaying state on a basis of a change, caused by applying the voltage to the liquid crystal layer, in an orientation of liquid crystal molecules contained in the liquid crystal layer
Implementation Method 2
a wavelength conversion layer containing a quantum-dot phosphor... blue light emitted by a blue light-emitting diode (LED) is (i) converted by the wavelength conversion layer into red light or green light
Data Source
AI summary
A liquid crystal display module is switchable between a blocking state and a displaying state on the basis of a change, caused by applying a voltage to the liquid crystal layer, in the orientation of liquid crystal molecules contained in the liquid crystal layer, the blocking state being a state in which transmitting light is concentrated to a blocking region on an initial optical axis, the displaying state being a state in which transmitting light is concentrated to a light-emitting region on a voltage-induced optical axis different from the initial optical axis.