Liquid Crystal Display Device With Lateral And Vertical Electric Fields
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Solution Overview
Problem
Liquid crystal display devices used as see-through displays suffer from low light utilization due to color filters and polarization plates, leading to blurred backgrounds and decreased display quality, particularly when used in field sequential systems requiring high-speed response.
Innovation Solution
A liquid crystal display device with a structure that includes a first and second substrate with electrodes generating lateral and vertical electric fields, allowing for black, white, and transparent display states, and utilizing a field sequential system without a color filter, with specific voltage settings to achieve high response characteristics and improved light utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a color filter and polarization plate are provided in a liquid crystal display device, then color display is achieved, but light utilization factor decreases
Solution Approach 1:
The patent removes the color filter from the liquid crystal display device structure. By extracting this light-absorbing component, the device achieves high light utilization factor (over 90% transmittance) while maintaining color display capability through sub-frame driving techniques that sequentially display red, green, and blue colors.
2Illumination intensity
If a field sequential system is used without a color filter, then light utilization factor is improved, but response speed requirement increases
Solution Approach 1:
The patent employs sub-frame driving where red, green, and blue color sub-frames are displayed in sequential periods within each frame. This periodic action allows the liquid crystal to maintain high light transmittance while achieving adequate response speed by optimizing the timing and duration of each color sub-frame display.
Solution Approach 2:
The patent applies overdrive voltage during the transition periods between color sub-frames to accelerate liquid crystal response. This preliminary action ensures that the liquid crystal molecules reach their target orientation faster, meeting the high response speed requirements of field sequential display without sacrificing light utilization.
3Illumination intensity
If high voltage is applied to achieve white display state, then luminance is improved, but background blurring occurs
Solution Approach 1:
Instead of maintaining continuous high voltage for white display, the patent uses periodic voltage application with distinct on and off periods. During off periods, the voltage is reduced or removed, allowing liquid crystal molecules to return to their initial state, which prevents background blurring while maintaining high luminance during active display periods.
Solution Approach 2:
The patent dynamically adjusts voltage levels based on the required display state. Rather than using fixed high voltage, the system varies voltage magnitude and duration to achieve optimal luminance while preventing the sustained high-voltage conditions that cause background blurring and visual discomfort.
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 device provides high display quality and high response characteristics, preventing background blurring and enhancing light utilization, enabling clear see-through displays with improved luminance and reduced noise.
Implementation Method 1
a second electrode generating a lateral electric field in the liquid crystal layer together with the first electrode
Implementation Method 2
a third electrode generating a vertical electric field in the liquid crystal layer together with the first electrode
Implementation Method 3
a liquid crystal layer provided between the first substrate and the second substrate
Data Source
AI summary
Pixels of a liquid crystal display device exhibit, in a switched manner, a black display state where black display is provided in a state where a vertical electric field is generated in a liquid crystal layer, a white display state where white display is provided in a state where a lateral electric field is generated in the liquid crystal layer, and a transparent display state where a rear side of a liquid crystal display panel is seen through where no voltage is applied to the liquid crystal layer. A gray scale level group including gray scale levels from a lowest level to a highest level includes a white level, a transparent level having a luminance higher than that of the white level, and a plurality of sub-transparent levels each having a luminance higher than that of the white level and lower than that of the transparent level.