Asymmetric Inter-Electrode Distances in LCDs
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Solution Overview
Problem
Liquid crystal display devices using lateral electric field modes face challenges in achieving optimal transmissivity and minimizing luminosity variation due to substrate assembling shifts, which affect inter-electrode distances and voltage requirements.
Innovation Solution
A liquid crystal display device design where one of the four inter-electrode distances is set to an optimal value, differing from the others, to achieve more than 90% peak transmissivity within a usable voltage range, while allowing for flexibility in pixel length and reducing luminosity variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If all inter-electrode distances are set to the same value, then the structure is simple and easy to manufacture, but luminosity variation occurs due to substrate assembling shifts and transmissivity cannot be optimized
Solution Approach 1:
The patent applies asymmetry by setting at least one inter-electrode distance to be different from the others. Specifically, while three inter-electrode distances are set to a first value, at least one is set to a second value that differs from the first. This asymmetric configuration compensates for substrate assembling shifts and reduces luminosity variation, resolving the contradiction between manufacturing simplicity and display uniformity.
Solution Approach 2:
The patent changes the parameter of inter-electrode distance from a uniform value to a non-uniform distribution. By setting at least one inter-electrode distance to differ from the others, the patent optimizes transmissivity and reduces luminosity variation caused by assembling shifts, thereby improving display reliability while maintaining reasonable manufacturing complexity.
2Use of energy by moving object
If inter-electrode distance is increased to reduce voltage requirements, then power consumption decreases, but transmissivity and display quality deteriorate
Solution Approach 1:
The patent optimizes the inter-electrode distance parameters to achieve a balance between voltage requirements and transmissivity. By setting at least one inter-electrode distance to a specific value that differs from others, the patent enables high transmissivity (more than 90% peak) while maintaining usable voltage ranges, thus resolving the contradiction between energy efficiency and display quality.
3Illumination intensity
If pixel length is fixed to optimize transmissivity, then transmissivity is maximized, but flexibility in design and accommodation of different display sizes is reduced
Solution Approach 1:
The patent uses asymmetric inter-electrode distance configuration where at least one distance differs from the others. This asymmetric design provides flexibility in pixel length adaptation while maintaining optimized transmissivity characteristics, allowing the display to accommodate different sizes and resolutions without sacrificing display quality.
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 design effectively controls luminosity variation and maintains high transmissivity across a range of voltages, enhancing display quality and accommodating various pixel lengths without degrading performance.
Implementation Method 1
Liquid crystal molecules are switched by the lateral electric field substantially in parallel with the principal surface of the array substrate
Implementation Method 2
another technique is also proposed, in which the liquid crystal molecules are switched using the lateral electric field or an oblique electric field between the pixel electrode formed in the array substrate and the common electrode formed in a counter substrate
Data Source
AI summary
In one embodiment, a first substrate is provided with first and second main pixel electrodes electrically connected each other extending along a first direction, respectively. A second substrate includes first to third main common electrodes electrically connected each other extending along the first direction, respectively. The first main pixel electrode is arranged between the first and second main common electrodes, and the second main pixel electrode is arranged between the second and third main common electrodes. Four inter-electrode distances are formed. One of the four inter-electrode distances is set to an optimal inter-electrode distance, and one of the four inter-electrode distances is different from at least one of the other three inter-electrode distances. Herein, the optimal inter-electrode distance is defined as follows: in a range of voltage which is applied between the electrodes, more than 90% of a peak transmissivity is obtained by the optimal inter-electrode distance.